Add m-esr52 at 52.6.0

32 files changed, 9103 insertions, 0 deletions

diff --git a/tools/profiler/core/EHABIStackWalk.cpp b/tools/profiler/core/EHABIStackWalk.cpp
new file mode 100644
index 000000000..76068cdea
--- /dev/null
+++ b/tools/profiler/core/EHABIStackWalk.cpp
@@ -0,0 +1,678 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * This is an implementation of stack unwinding according to a subset
+ * of the ARM Exception Handling ABI, as described in:
+ *   http://infocenter.arm.com/help/topic/com.arm.doc.ihi0038a/IHI0038A_ehabi.pdf
+ *
+ * This handles only the ARM-defined "personality routines" (chapter
+ * 9), and don't track the value of FP registers, because profiling
+ * needs only chain of PC/SP values.
+ *
+ * Because the exception handling info may not be accurate for all
+ * possible places where an async signal could occur (e.g., in a
+ * prologue or epilogue), this bounds-checks all stack accesses.
+ *
+ * This file uses "struct" for structures in the exception tables and
+ * "class" otherwise.  We should avoid violating the C++11
+ * standard-layout rules in the former.
+ */
+
+#include "EHABIStackWalk.h"
+
+#include "shared-libraries.h"
+#include "platform.h"
+
+#include "mozilla/Atomics.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/EndianUtils.h"
+
+#include <algorithm>
+#include <elf.h>
+#include <stdint.h>
+#include <vector>
+#include <string>
+
+#ifndef PT_ARM_EXIDX
+#define PT_ARM_EXIDX 0x70000001
+#endif
+
+// Bug 1082817: ICS B2G has a buggy linker that doesn't always ensure
+// that the EXIDX is sorted by address, as the spec requires.  So in
+// that case we build and sort an array of pointers into the index,
+// and binary-search that; otherwise, we search the index in place
+// (avoiding the time and space overhead of the indirection).
+#if defined(ANDROID_VERSION) && ANDROID_VERSION < 16
+#define HAVE_UNSORTED_EXIDX
+#endif
+
+namespace mozilla {
+
+struct PRel31 {
+  uint32_t mBits;
+  bool topBit() const { return mBits & 0x80000000; }
+  uint32_t value() const { return mBits & 0x7fffffff; }
+  int32_t offset() const { return (static_cast<int32_t>(mBits) << 1) >> 1; }
+  const void *compute() const {
+    return reinterpret_cast<const char *>(this) + offset();
+  }
+private:
+  PRel31(const PRel31 &copied) = delete;
+  PRel31() = delete;
+};
+
+struct EHEntry {
+  PRel31 startPC;
+  PRel31 exidx;
+private:
+  EHEntry(const EHEntry &copied) = delete;
+  EHEntry() = delete;
+};
+
+class EHState {
+  // Note that any core register can be used as a "frame pointer" to
+  // influence the unwinding process, so this must track all of them.
+  uint32_t mRegs[16];
+public:
+  bool unwind(const EHEntry *aEntry, const void *stackBase);
+  uint32_t &operator[](int i) { return mRegs[i]; }
+  const uint32_t &operator[](int i) const { return mRegs[i]; }
+  EHState(const mcontext_t &);
+};
+
+enum {
+  R_SP = 13,
+  R_LR = 14,
+  R_PC = 15
+};
+
+#ifdef HAVE_UNSORTED_EXIDX
+class EHEntryHandle {
+  const EHEntry *mValue;
+public:
+  EHEntryHandle(const EHEntry *aEntry) : mValue(aEntry) { }
+  const EHEntry *value() const { return mValue; }
+};
+
+bool operator<(const EHEntryHandle &lhs, const EHEntryHandle &rhs) {
+  return lhs.value()->startPC.compute() < rhs.value()->startPC.compute();
+}
+#endif
+
+class EHTable {
+  uint32_t mStartPC;
+  uint32_t mEndPC;
+  uint32_t mLoadOffset;
+#ifdef HAVE_UNSORTED_EXIDX
+  // In principle we should be able to binary-search the index section in
+  // place, but the ICS toolchain's linker is noncompliant and produces
+  // indices that aren't entirely sorted (e.g., libc).  So we have this:
+  std::vector<EHEntryHandle> mEntries;
+  typedef std::vector<EHEntryHandle>::const_iterator EntryIterator;
+  EntryIterator entriesBegin() const { return mEntries.begin(); }
+  EntryIterator entriesEnd() const { return mEntries.end(); }
+  static const EHEntry* entryGet(EntryIterator aEntry) {
+    return aEntry->value();
+  }
+#else
+  typedef const EHEntry *EntryIterator;
+  EntryIterator mEntriesBegin, mEntriesEnd;
+  EntryIterator entriesBegin() const { return mEntriesBegin; }
+  EntryIterator entriesEnd() const { return mEntriesEnd; }
+  static const EHEntry* entryGet(EntryIterator aEntry) { return aEntry; }
+#endif
+  std::string mName;
+public:
+  EHTable(const void *aELF, size_t aSize, const std::string &aName);
+  const EHEntry *lookup(uint32_t aPC) const;
+  bool isValid() const { return entriesEnd() != entriesBegin(); }
+  const std::string &name() const { return mName; }
+  uint32_t startPC() const { return mStartPC; }
+  uint32_t endPC() const { return mEndPC; }
+  uint32_t loadOffset() const { return mLoadOffset; }
+};
+
+class EHAddrSpace {
+  std::vector<uint32_t> mStarts;
+  std::vector<EHTable> mTables;
+  static mozilla::Atomic<const EHAddrSpace*> sCurrent;
+public:
+  explicit EHAddrSpace(const std::vector<EHTable>& aTables);
+  const EHTable *lookup(uint32_t aPC) const;
+  static void Update();
+  static const EHAddrSpace *Get();
+};
+
+
+void EHABIStackWalkInit()
+{
+  EHAddrSpace::Update();
+}
+
+size_t EHABIStackWalk(const mcontext_t &aContext, void *stackBase,
+                      void **aSPs, void **aPCs, const size_t aNumFrames)
+{
+  const EHAddrSpace *space = EHAddrSpace::Get();
+  EHState state(aContext);
+  size_t count = 0;
+
+  while (count < aNumFrames) {
+    uint32_t pc = state[R_PC], sp = state[R_SP];
+    aPCs[count] = reinterpret_cast<void *>(pc);
+    aSPs[count] = reinterpret_cast<void *>(sp);
+    count++;
+
+    if (!space)
+      break;
+    // TODO: cache these lookups.  Binary-searching libxul is
+    // expensive (possibly more expensive than doing the actual
+    // unwind), and even a small cache should help.
+    const EHTable *table = space->lookup(pc);
+    if (!table)
+      break;
+    const EHEntry *entry = table->lookup(pc);
+    if (!entry)
+      break;
+    if (!state.unwind(entry, stackBase))
+      break;
+  }
+  
+  return count;
+}
+
+
+class EHInterp {
+public:
+  // Note that stackLimit is exclusive and stackBase is inclusive
+  // (i.e, stackLimit < SP <= stackBase), following the convention
+  // set by the AAPCS spec.
+  EHInterp(EHState &aState, const EHEntry *aEntry,
+           uint32_t aStackLimit, uint32_t aStackBase)
+    : mState(aState),
+      mStackLimit(aStackLimit),
+      mStackBase(aStackBase),
+      mNextWord(0),
+      mWordsLeft(0),
+      mFailed(false)
+  {
+    const PRel31 &exidx = aEntry->exidx;
+    uint32_t firstWord;
+
+    if (exidx.mBits == 1) {  // EXIDX_CANTUNWIND
+      mFailed = true;
+      return;
+    }
+    if (exidx.topBit()) {
+      firstWord = exidx.mBits;
+    } else {
+      mNextWord = reinterpret_cast<const uint32_t *>(exidx.compute());
+      firstWord = *mNextWord++;
+    }
+
+    switch (firstWord >> 24) {
+    case 0x80: // short
+      mWord = firstWord << 8;
+      mBytesLeft = 3;
+      break;
+    case 0x81: case 0x82: // long; catch descriptor size ignored
+      mWord = firstWord << 16;
+      mBytesLeft = 2;
+      mWordsLeft = (firstWord >> 16) & 0xff;
+      break;
+    default:
+      // unknown personality
+      mFailed = true;
+    }
+  }
+
+  bool unwind();
+
+private:
+  // TODO: GCC has been observed not CSEing repeated reads of
+  // mState[R_SP] with writes to mFailed between them, suggesting that
+  // it hasn't determined that they can't alias and is thus missing
+  // optimization opportunities.  So, we may want to flatten EHState
+  // into this class; this may also make the code simpler.
+  EHState &mState;
+  uint32_t mStackLimit;
+  uint32_t mStackBase;
+  const uint32_t *mNextWord;
+  uint32_t mWord;
+  uint8_t mWordsLeft;
+  uint8_t mBytesLeft;
+  bool mFailed;
+
+  enum {
+    I_ADDSP    = 0x00, // 0sxxxxxx (subtract if s)
+    M_ADDSP    = 0x80,
+    I_POPMASK  = 0x80, // 1000iiii iiiiiiii (if any i set)
+    M_POPMASK  = 0xf0,
+    I_MOVSP    = 0x90, // 1001nnnn
+    M_MOVSP    = 0xf0,
+    I_POPN     = 0xa0, // 1010lnnn
+    M_POPN     = 0xf0,
+    I_FINISH   = 0xb0, // 10110000
+    I_POPLO    = 0xb1, // 10110001 0000iiii (if any i set)
+    I_ADDSPBIG = 0xb2, // 10110010 uleb128
+    I_POPFDX   = 0xb3, // 10110011 sssscccc
+    I_POPFDX8  = 0xb8, // 10111nnn
+    M_POPFDX8  = 0xf8,
+    // "Intel Wireless MMX" extensions omitted.
+    I_POPFDD   = 0xc8, // 1100100h sssscccc
+    M_POPFDD   = 0xfe,
+    I_POPFDD8  = 0xd0, // 11010nnn
+    M_POPFDD8  = 0xf8
+  };
+
+  uint8_t next() {
+    if (mBytesLeft == 0) {
+      if (mWordsLeft == 0) {
+        return I_FINISH;
+      }
+      mWordsLeft--;
+      mWord = *mNextWord++;
+      mBytesLeft = 4;
+    }
+    mBytesLeft--;
+    mWord = (mWord << 8) | (mWord >> 24); // rotate
+    return mWord;
+  }
+
+  uint32_t &vSP() { return mState[R_SP]; }
+  uint32_t *ptrSP() { return reinterpret_cast<uint32_t *>(vSP()); }
+
+  void checkStackBase() { if (vSP() > mStackBase) mFailed = true; }
+  void checkStackLimit() { if (vSP() <= mStackLimit) mFailed = true; }
+  void checkStackAlign() { if ((vSP() & 3) != 0) mFailed = true; }
+  void checkStack() {
+    checkStackBase();
+    checkStackLimit();
+    checkStackAlign();
+  }
+
+  void popRange(uint8_t first, uint8_t last, uint16_t mask) {
+    bool hasSP = false;
+    uint32_t tmpSP;
+    if (mask == 0)
+      mFailed = true;
+    for (uint8_t r = first; r <= last; ++r) {
+      if (mask & 1) {
+        if (r == R_SP) {
+          hasSP = true;
+          tmpSP = *ptrSP();
+        } else
+          mState[r] = *ptrSP();
+        vSP() += 4;
+        checkStackBase();
+        if (mFailed)
+          return;
+      }
+      mask >>= 1;
+    }
+    if (hasSP) {
+      vSP() = tmpSP;
+      checkStack();
+    }
+  }
+};
+
+
+bool EHState::unwind(const EHEntry *aEntry, const void *stackBasePtr) {
+  // The unwinding program cannot set SP to less than the initial value.
+  uint32_t stackLimit = mRegs[R_SP] - 4;
+  uint32_t stackBase = reinterpret_cast<uint32_t>(stackBasePtr);
+  EHInterp interp(*this, aEntry, stackLimit, stackBase);
+  return interp.unwind();
+}
+
+bool EHInterp::unwind() {
+  mState[R_PC] = 0;
+  checkStack();
+  while (!mFailed) {
+    uint8_t insn = next();
+#if DEBUG_EHABI_UNWIND
+    LOGF("unwind insn = %02x", (unsigned)insn);
+#endif
+    // Try to put the common cases first.
+
+    // 00xxxxxx: vsp = vsp + (xxxxxx << 2) + 4
+    // 01xxxxxx: vsp = vsp - (xxxxxx << 2) - 4
+    if ((insn & M_ADDSP) == I_ADDSP) {
+      uint32_t offset = ((insn & 0x3f) << 2) + 4;
+      if (insn & 0x40) {
+        vSP() -= offset;
+        checkStackLimit();
+      } else {
+        vSP() += offset;
+        checkStackBase();
+      }
+      continue;
+    }
+
+    // 10100nnn: Pop r4-r[4+nnn]
+    // 10101nnn: Pop r4-r[4+nnn], r14
+    if ((insn & M_POPN) == I_POPN) {
+      uint8_t n = (insn & 0x07) + 1;
+      bool lr = insn & 0x08;
+      uint32_t *ptr = ptrSP();
+      vSP() += (n + (lr ? 1 : 0)) * 4;
+      checkStackBase();
+      for (uint8_t r = 4; r < 4 + n; ++r)
+        mState[r] = *ptr++;
+      if (lr)
+        mState[R_LR] = *ptr++;
+      continue;
+    }
+
+    // 1011000: Finish
+    if (insn == I_FINISH) {
+      if (mState[R_PC] == 0) {
+        mState[R_PC] = mState[R_LR];
+        // Non-standard change (bug 916106): Prevent the caller from
+        // re-using LR.  Since the caller is by definition not a leaf
+        // routine, it will have to restore LR from somewhere to
+        // return to its own caller, so we can safely zero it here.
+        // This makes a difference only if an error in unwinding
+        // (e.g., caused by starting from within a prologue/epilogue)
+        // causes us to load a pointer to a leaf routine as LR; if we
+        // don't do something, we'll go into an infinite loop of
+        // "returning" to that same function.
+        mState[R_LR] = 0;
+      }
+      return true;
+    }
+
+    // 1001nnnn: Set vsp = r[nnnn]
+    if ((insn & M_MOVSP) == I_MOVSP) {
+      vSP() = mState[insn & 0x0f];
+      checkStack();
+      continue;
+    }
+
+    // 11001000 sssscccc: Pop VFP regs D[16+ssss]-D[16+ssss+cccc] (as FLDMFDD)
+    // 11001001 sssscccc: Pop VFP regs D[ssss]-D[ssss+cccc] (as FLDMFDD)
+    if ((insn & M_POPFDD) == I_POPFDD) {
+      uint8_t n = (next() & 0x0f) + 1;
+      // Note: if the 16+ssss+cccc > 31, the encoding is reserved.
+      // As the space is currently unused, we don't try to check.
+      vSP() += 8 * n;
+      checkStackBase();
+      continue;
+    }
+
+    // 11010nnn: Pop VFP regs D[8]-D[8+nnn] (as FLDMFDD)
+    if ((insn & M_POPFDD8) == I_POPFDD8) {
+      uint8_t n = (insn & 0x07) + 1;
+      vSP() += 8 * n;
+      checkStackBase();
+      continue;
+    }
+
+    // 10110010 uleb128: vsp = vsp + 0x204 + (uleb128 << 2)
+    if (insn == I_ADDSPBIG) {
+      uint32_t acc = 0;
+      uint8_t shift = 0;
+      uint8_t byte;
+      do {
+        if (shift >= 32)
+          return false;
+        byte = next();
+        acc |= (byte & 0x7f) << shift;
+        shift += 7;
+      } while (byte & 0x80);
+      uint32_t offset = 0x204 + (acc << 2);
+      // The calculations above could have overflowed.
+      // But the one we care about is this:
+      if (vSP() + offset < vSP())
+        mFailed = true;
+      vSP() += offset;
+      // ...so that this is the only other check needed:
+      checkStackBase();
+      continue;
+    }
+
+    // 1000iiii iiiiiiii (i not all 0): Pop under masks {r15-r12}, {r11-r4}
+    if ((insn & M_POPMASK) == I_POPMASK) {
+      popRange(4, 15, ((insn & 0x0f) << 8) | next());
+      continue;
+    }
+
+    // 1011001 0000iiii (i not all 0): Pop under mask {r3-r0}
+    if (insn == I_POPLO) {
+      popRange(0, 3, next() & 0x0f);
+      continue;
+    }
+
+    // 10110011 sssscccc: Pop VFP regs D[ssss]-D[ssss+cccc] (as FLDMFDX)
+    if (insn == I_POPFDX) {
+      uint8_t n = (next() & 0x0f) + 1;
+      vSP() += 8 * n + 4;
+      checkStackBase();
+      continue;
+    }
+
+    // 10111nnn: Pop VFP regs D[8]-D[8+nnn] (as FLDMFDX)
+    if ((insn & M_POPFDX8) == I_POPFDX8) {
+      uint8_t n = (insn & 0x07) + 1;
+      vSP() += 8 * n + 4;
+      checkStackBase();
+      continue;
+    }
+
+    // unhandled instruction
+#ifdef DEBUG_EHABI_UNWIND
+    LOGF("Unhandled EHABI instruction 0x%02x", insn);
+#endif
+    mFailed = true;
+  }
+  return false;
+}
+
+
+bool operator<(const EHTable &lhs, const EHTable &rhs) {
+  return lhs.startPC() < rhs.startPC();
+}
+
+// Async signal unsafe.
+EHAddrSpace::EHAddrSpace(const std::vector<EHTable>& aTables)
+  : mTables(aTables)
+{
+  std::sort(mTables.begin(), mTables.end());
+  DebugOnly<uint32_t> lastEnd = 0;
+  for (std::vector<EHTable>::iterator i = mTables.begin();
+       i != mTables.end(); ++i) {
+    MOZ_ASSERT(i->startPC() >= lastEnd);
+    mStarts.push_back(i->startPC());
+    lastEnd = i->endPC();
+  }
+}
+
+const EHTable *EHAddrSpace::lookup(uint32_t aPC) const {
+  ptrdiff_t i = (std::upper_bound(mStarts.begin(), mStarts.end(), aPC)
+                 - mStarts.begin()) - 1;
+
+  if (i < 0 || aPC >= mTables[i].endPC())
+    return 0;
+  return &mTables[i];
+}
+
+
+const EHEntry *EHTable::lookup(uint32_t aPC) const {
+  MOZ_ASSERT(aPC >= mStartPC);
+  if (aPC >= mEndPC)
+    return nullptr;
+
+  EntryIterator begin = entriesBegin();
+  EntryIterator end = entriesEnd();
+  MOZ_ASSERT(begin < end);
+  if (aPC < reinterpret_cast<uint32_t>(entryGet(begin)->startPC.compute()))
+    return nullptr;
+
+  while (end - begin > 1) {
+#ifdef EHABI_UNWIND_MORE_ASSERTS
+    if (entryGet(end - 1)->startPC.compute()
+        < entryGet(begin)->startPC.compute()) {
+      MOZ_CRASH("unsorted exidx");
+    }
+#endif
+    EntryIterator mid = begin + (end - begin) / 2;
+    if (aPC < reinterpret_cast<uint32_t>(entryGet(mid)->startPC.compute()))
+      end = mid;
+    else
+      begin = mid;
+  }
+  return entryGet(begin);
+}
+
+
+#if MOZ_LITTLE_ENDIAN
+static const unsigned char hostEndian = ELFDATA2LSB;
+#elif MOZ_BIG_ENDIAN
+static const unsigned char hostEndian = ELFDATA2MSB;
+#else
+#error "No endian?"
+#endif
+
+// Async signal unsafe: std::vector::reserve, std::string copy ctor.
+EHTable::EHTable(const void *aELF, size_t aSize, const std::string &aName)
+  : mStartPC(~0), // largest uint32_t
+    mEndPC(0),
+#ifndef HAVE_UNSORTED_EXIDX
+    mEntriesBegin(nullptr),
+    mEntriesEnd(nullptr),
+#endif
+    mName(aName)
+{
+  const uint32_t base = reinterpret_cast<uint32_t>(aELF);
+
+  if (aSize < sizeof(Elf32_Ehdr))
+    return;
+
+  const Elf32_Ehdr &file = *(reinterpret_cast<Elf32_Ehdr *>(base));
+  if (memcmp(&file.e_ident[EI_MAG0], ELFMAG, SELFMAG) != 0 ||
+      file.e_ident[EI_CLASS] != ELFCLASS32 ||
+      file.e_ident[EI_DATA] != hostEndian ||
+      file.e_ident[EI_VERSION] != EV_CURRENT ||
+      file.e_ident[EI_OSABI] != ELFOSABI_SYSV ||
+#ifdef EI_ABIVERSION
+      file.e_ident[EI_ABIVERSION] != 0 ||
+#endif
+      file.e_machine != EM_ARM ||
+      file.e_version != EV_CURRENT)
+    // e_flags?
+    return;
+
+  MOZ_ASSERT(file.e_phoff + file.e_phnum * file.e_phentsize <= aSize);
+  const Elf32_Phdr *exidxHdr = 0, *zeroHdr = 0;
+  for (unsigned i = 0; i < file.e_phnum; ++i) {
+    const Elf32_Phdr &phdr =
+      *(reinterpret_cast<Elf32_Phdr *>(base + file.e_phoff
+                                       + i * file.e_phentsize));
+    if (phdr.p_type == PT_ARM_EXIDX) {
+      exidxHdr = &phdr;
+    } else if (phdr.p_type == PT_LOAD) {
+      if (phdr.p_offset == 0) {
+        zeroHdr = &phdr;
+      }
+      if (phdr.p_flags & PF_X) {
+        mStartPC = std::min(mStartPC, phdr.p_vaddr);
+        mEndPC = std::max(mEndPC, phdr.p_vaddr + phdr.p_memsz);
+      }
+    }
+  }
+  if (!exidxHdr)
+    return;
+  if (!zeroHdr)
+    return;
+  mLoadOffset = base - zeroHdr->p_vaddr;
+  mStartPC += mLoadOffset;
+  mEndPC += mLoadOffset;
+
+  // Create a sorted index of the index to work around linker bugs.
+  const EHEntry *startTable =
+    reinterpret_cast<const EHEntry *>(mLoadOffset + exidxHdr->p_vaddr);
+  const EHEntry *endTable =
+    reinterpret_cast<const EHEntry *>(mLoadOffset + exidxHdr->p_vaddr
+                                    + exidxHdr->p_memsz);
+#ifdef HAVE_UNSORTED_EXIDX
+  mEntries.reserve(endTable - startTable);
+  for (const EHEntry *i = startTable; i < endTable; ++i)
+    mEntries.push_back(i);
+  std::sort(mEntries.begin(), mEntries.end());
+#else
+  mEntriesBegin = startTable;
+  mEntriesEnd = endTable;
+#endif
+}
+
+
+mozilla::Atomic<const EHAddrSpace*> EHAddrSpace::sCurrent(nullptr);
+
+// Async signal safe; can fail if Update() hasn't returned yet.
+const EHAddrSpace *EHAddrSpace::Get() {
+  return sCurrent;
+}
+
+// Collect unwinding information from loaded objects.  Calls after the
+// first have no effect.  Async signal unsafe.
+void EHAddrSpace::Update() {
+  const EHAddrSpace *space = sCurrent;
+  if (space)
+    return;
+
+  SharedLibraryInfo info = SharedLibraryInfo::GetInfoForSelf();
+  std::vector<EHTable> tables;
+
+  for (size_t i = 0; i < info.GetSize(); ++i) {
+    const SharedLibrary &lib = info.GetEntry(i);
+    if (lib.GetOffset() != 0)
+      // TODO: if it has a name, and we haven't seen a mapping of
+      // offset 0 for that file, try opening it and reading the
+      // headers instead.  The only thing I've seen so far that's
+      // linked so as to need that treatment is the dynamic linker
+      // itself.
+      continue;
+    EHTable tab(reinterpret_cast<const void *>(lib.GetStart()),
+              lib.GetEnd() - lib.GetStart(), lib.GetName());
+    if (tab.isValid())
+      tables.push_back(tab);
+  }
+  space = new EHAddrSpace(tables);
+
+  if (!sCurrent.compareExchange(nullptr, space)) {
+    delete space;
+    space = sCurrent;
+  }
+}
+
+
+EHState::EHState(const mcontext_t &context) {
+#ifdef linux
+  mRegs[0] = context.arm_r0;
+  mRegs[1] = context.arm_r1;
+  mRegs[2] = context.arm_r2;
+  mRegs[3] = context.arm_r3;
+  mRegs[4] = context.arm_r4;
+  mRegs[5] = context.arm_r5;
+  mRegs[6] = context.arm_r6;
+  mRegs[7] = context.arm_r7;
+  mRegs[8] = context.arm_r8;
+  mRegs[9] = context.arm_r9;
+  mRegs[10] = context.arm_r10;
+  mRegs[11] = context.arm_fp;
+  mRegs[12] = context.arm_ip;
+  mRegs[13] = context.arm_sp;
+  mRegs[14] = context.arm_lr;
+  mRegs[15] = context.arm_pc;
+#else
+# error "Unhandled OS for ARM EHABI unwinding"
+#endif
+}
+
+} // namespace mozilla
+
diff --git a/tools/profiler/core/EHABIStackWalk.h b/tools/profiler/core/EHABIStackWalk.h
new file mode 100644
index 000000000..5529d9511
--- /dev/null
+++ b/tools/profiler/core/EHABIStackWalk.h
@@ -0,0 +1,28 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * This is an implementation of stack unwinding according to a subset
+ * of the ARM Exception Handling ABI; see the comment at the top of
+ * the .cpp file for details.
+ */
+
+#ifndef mozilla_EHABIStackWalk_h__
+#define mozilla_EHABIStackWalk_h__
+
+#include <stddef.h>
+#include <ucontext.h>
+
+namespace mozilla {
+
+void EHABIStackWalkInit();
+
+size_t EHABIStackWalk(const mcontext_t &aContext, void *stackBase,
+                      void **aSPs, void **aPCs, size_t aNumFrames);
+
+}
+
+#endif
diff --git a/tools/profiler/core/GeckoSampler.cpp b/tools/profiler/core/GeckoSampler.cpp
new file mode 100644
index 000000000..f4249a7a5
--- /dev/null
+++ b/tools/profiler/core/GeckoSampler.cpp
@@ -0,0 +1,1306 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <algorithm>
+#include <string>
+#include <stdio.h>
+#include <fstream>
+#include <sstream>
+#include "GeckoProfiler.h"
+#ifndef SPS_STANDALONE
+#include "SaveProfileTask.h"
+#include "nsThreadUtils.h"
+#include "prenv.h"
+#include "prtime.h"
+#include "nsXULAppAPI.h"
+#endif
+#include "ProfileEntry.h"
+#include "SyncProfile.h"
+#include "platform.h"
+#include "shared-libraries.h"
+#include "mozilla/StackWalk.h"
+#include "GeckoSampler.h"
+
+// JSON
+#include "ProfileJSONWriter.h"
+
+#ifndef SPS_STANDALONE
+// Meta
+#include "nsXPCOM.h"
+#include "nsXPCOMCID.h"
+#include "nsIHttpProtocolHandler.h"
+#include "nsServiceManagerUtils.h"
+#include "nsIXULRuntime.h"
+#include "nsIXULAppInfo.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsIObserverService.h"
+#include "mozilla/Services.h"
+#include "PlatformMacros.h"
+#include "nsTArray.h"
+
+#include "mozilla/ProfileGatherer.h"
+#endif
+
+#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
+  #include "FennecJNIWrappers.h"
+#endif
+
+#ifndef SPS_STANDALONE
+// JS
+#include "jsfriendapi.h"
+#include "js/ProfilingFrameIterator.h"
+#endif
+
+#if defined(MOZ_PROFILING) && (defined(XP_MACOSX) || defined(XP_WIN))
+ #define USE_NS_STACKWALK
+#endif
+
+#if defined(XP_WIN)
+typedef CONTEXT tickcontext_t;
+#elif defined(LINUX)
+#include <ucontext.h>
+typedef ucontext_t tickcontext_t;
+#endif
+
+#if defined(LINUX) || defined(XP_MACOSX)
+#include <sys/types.h>
+pid_t gettid();
+#endif
+
+#if defined(__arm__) && defined(ANDROID)
+ // Should also work on ARM Linux, but not tested there yet.
+ #define USE_EHABI_STACKWALK
+#endif
+#ifdef USE_EHABI_STACKWALK
+ #include "EHABIStackWalk.h"
+#endif
+
+#ifndef SPS_STANDALONE
+#if defined(SPS_PLAT_amd64_linux) || defined(SPS_PLAT_x86_linux)
+# define USE_LUL_STACKWALK
+# include "lul/LulMain.h"
+# include "lul/platform-linux-lul.h"
+#endif
+#endif
+
+using std::string;
+using namespace mozilla;
+
+#ifndef MAXPATHLEN
+ #ifdef PATH_MAX
+  #define MAXPATHLEN PATH_MAX
+ #elif defined(MAX_PATH)
+  #define MAXPATHLEN MAX_PATH
+ #elif defined(_MAX_PATH)
+  #define MAXPATHLEN _MAX_PATH
+ #elif defined(CCHMAXPATH)
+  #define MAXPATHLEN CCHMAXPATH
+ #else
+  #define MAXPATHLEN 1024
+ #endif
+#endif
+
+#ifdef MOZ_VALGRIND
+# include <valgrind/memcheck.h>
+#else
+# define VALGRIND_MAKE_MEM_DEFINED(_addr,_len)   ((void)0)
+#endif
+
+
+///////////////////////////////////////////////////////////////////////
+// BEGIN SaveProfileTask et al
+
+static void
+AddSharedLibraryInfoToStream(std::ostream& aStream, const SharedLibrary& aLib)
+{
+  aStream << "{";
+  aStream << "\"start\":" << aLib.GetStart();
+  aStream << ",\"end\":" << aLib.GetEnd();
+  aStream << ",\"offset\":" << aLib.GetOffset();
+  aStream << ",\"name\":\"" << aLib.GetName() << "\"";
+  const std::string &breakpadId = aLib.GetBreakpadId();
+  aStream << ",\"breakpadId\":\"" << breakpadId << "\"";
+#ifdef XP_WIN
+  // FIXME: remove this XP_WIN code when the profiler plugin has switched to
+  // using breakpadId.
+  std::string pdbSignature = breakpadId.substr(0, 32);
+  std::string pdbAgeStr = breakpadId.substr(32,  breakpadId.size() - 1);
+
+  std::stringstream stream;
+  stream << pdbAgeStr;
+
+  unsigned pdbAge;
+  stream << std::hex;
+  stream >> pdbAge;
+
+#ifdef DEBUG
+  std::ostringstream oStream;
+  oStream << pdbSignature << std::hex << std::uppercase << pdbAge;
+  MOZ_ASSERT(breakpadId == oStream.str());
+#endif
+
+  aStream << ",\"pdbSignature\":\"" << pdbSignature << "\"";
+  aStream << ",\"pdbAge\":" << pdbAge;
+  aStream << ",\"pdbName\":\"" << aLib.GetName() << "\"";
+#endif
+  aStream << "}";
+}
+
+std::string
+GetSharedLibraryInfoStringInternal()
+{
+  SharedLibraryInfo info = SharedLibraryInfo::GetInfoForSelf();
+  if (info.GetSize() == 0)
+    return "[]";
+
+  std::ostringstream os;
+  os << "[";
+  AddSharedLibraryInfoToStream(os, info.GetEntry(0));
+
+  for (size_t i = 1; i < info.GetSize(); i++) {
+    os << ",";
+    AddSharedLibraryInfoToStream(os, info.GetEntry(i));
+  }
+
+  os << "]";
+  return os.str();
+}
+
+static bool
+hasFeature(const char** aFeatures, uint32_t aFeatureCount, const char* aFeature) {
+  for(size_t i = 0; i < aFeatureCount; i++) {
+    if (strcmp(aFeatures[i], aFeature) == 0)
+      return true;
+  }
+  return false;
+}
+
+GeckoSampler::GeckoSampler(double aInterval, int aEntrySize,
+                         const char** aFeatures, uint32_t aFeatureCount,
+                         const char** aThreadNameFilters, uint32_t aFilterCount)
+  : Sampler(aInterval, true, aEntrySize)
+  , mPrimaryThreadProfile(nullptr)
+  , mBuffer(new ProfileBuffer(aEntrySize))
+  , mSaveRequested(false)
+#if defined(XP_WIN)
+  , mIntelPowerGadget(nullptr)
+#endif
+{
+  mUseStackWalk = hasFeature(aFeatures, aFeatureCount, "stackwalk");
+
+  mProfileJS = hasFeature(aFeatures, aFeatureCount, "js");
+  mProfileGPU = hasFeature(aFeatures, aFeatureCount, "gpu");
+  mProfilePower = hasFeature(aFeatures, aFeatureCount, "power");
+  // Users sometimes ask to filter by a list of threads but forget to request
+  // profiling non main threads. Let's make it implificit if we have a filter
+  mProfileThreads = hasFeature(aFeatures, aFeatureCount, "threads") || aFilterCount > 0;
+  mAddLeafAddresses = hasFeature(aFeatures, aFeatureCount, "leaf");
+  mPrivacyMode = hasFeature(aFeatures, aFeatureCount, "privacy");
+  mAddMainThreadIO = hasFeature(aFeatures, aFeatureCount, "mainthreadio");
+  mProfileMemory = hasFeature(aFeatures, aFeatureCount, "memory");
+  mTaskTracer = hasFeature(aFeatures, aFeatureCount, "tasktracer");
+  mLayersDump = hasFeature(aFeatures, aFeatureCount, "layersdump");
+  mDisplayListDump = hasFeature(aFeatures, aFeatureCount, "displaylistdump");
+  mProfileRestyle = hasFeature(aFeatures, aFeatureCount, "restyle");
+
+#if defined(XP_WIN)
+  if (mProfilePower) {
+    mIntelPowerGadget = new IntelPowerGadget();
+    mProfilePower = mIntelPowerGadget->Init();
+  }
+#endif
+
+#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
+  mProfileJava = mozilla::jni::IsFennec() &&
+      hasFeature(aFeatures, aFeatureCount, "java");
+#else
+  mProfileJava = false;
+#endif
+
+  // Deep copy aThreadNameFilters
+  MOZ_ALWAYS_TRUE(mThreadNameFilters.resize(aFilterCount));
+  for (uint32_t i = 0; i < aFilterCount; ++i) {
+    mThreadNameFilters[i] = aThreadNameFilters[i];
+  }
+
+  // Deep copy aFeatures
+  MOZ_ALWAYS_TRUE(mFeatures.resize(aFeatureCount));
+  for (uint32_t i = 0; i < aFeatureCount; ++i) {
+    mFeatures[i] = aFeatures[i];
+  }
+
+  bool ignore;
+  sStartTime = mozilla::TimeStamp::ProcessCreation(ignore);
+
+  {
+    ::MutexAutoLock lock(*sRegisteredThreadsMutex);
+
+    // Create ThreadProfile for each registered thread
+    for (uint32_t i = 0; i < sRegisteredThreads->size(); i++) {
+      ThreadInfo* info = sRegisteredThreads->at(i);
+
+      RegisterThread(info);
+    }
+
+    SetActiveSampler(this);
+  }
+
+#ifdef MOZ_TASK_TRACER
+  if (mTaskTracer) {
+    mozilla::tasktracer::StartLogging();
+  }
+#endif
+
+  mGatherer = new mozilla::ProfileGatherer(this);
+}
+
+GeckoSampler::~GeckoSampler()
+{
+  if (IsActive())
+    Stop();
+
+  SetActiveSampler(nullptr);
+
+  // Destroy ThreadProfile for all threads
+  {
+    ::MutexAutoLock lock(*sRegisteredThreadsMutex);
+
+    for (uint32_t i = 0; i < sRegisteredThreads->size(); i++) {
+      ThreadInfo* info = sRegisteredThreads->at(i);
+      ThreadProfile* profile = info->Profile();
+      if (profile) {
+        delete profile;
+        info->SetProfile(nullptr);
+      }
+      // We've stopped profiling. We no longer need to retain
+      // information for an old thread.
+      if (info->IsPendingDelete()) {
+        delete info;
+        sRegisteredThreads->erase(sRegisteredThreads->begin() + i);
+        i--;
+      }
+    }
+  }
+#if defined(XP_WIN)
+  delete mIntelPowerGadget;
+#endif
+
+  // Cancel any in-flight async profile gatherering
+  // requests
+  mGatherer->Cancel();
+}
+
+void GeckoSampler::HandleSaveRequest()
+{
+  if (!mSaveRequested)
+    return;
+  mSaveRequested = false;
+
+#ifndef SPS_STANDALONE
+  // TODO: Use use the ipc/chromium Tasks here to support processes
+  // without XPCOM.
+  nsCOMPtr<nsIRunnable> runnable = new SaveProfileTask();
+  NS_DispatchToMainThread(runnable);
+#endif
+}
+
+void GeckoSampler::DeleteExpiredMarkers()
+{
+  mBuffer->deleteExpiredStoredMarkers();
+}
+
+void GeckoSampler::StreamTaskTracer(SpliceableJSONWriter& aWriter)
+{
+#ifdef MOZ_TASK_TRACER
+  aWriter.StartArrayProperty("data");
+    UniquePtr<nsTArray<nsCString>> data = mozilla::tasktracer::GetLoggedData(sStartTime);
+    for (uint32_t i = 0; i < data->Length(); ++i) {
+      aWriter.StringElement((data->ElementAt(i)).get());
+    }
+  aWriter.EndArray();
+
+  aWriter.StartArrayProperty("threads");
+    ::MutexAutoLock lock(*sRegisteredThreadsMutex);
+    for (size_t i = 0; i < sRegisteredThreads->size(); i++) {
+      // Thread meta data
+      ThreadInfo* info = sRegisteredThreads->at(i);
+      aWriter.StartObjectElement();
+        if (XRE_GetProcessType() == GeckoProcessType_Plugin) {
+          // TODO Add the proper plugin name
+          aWriter.StringProperty("name", "Plugin");
+        } else {
+          aWriter.StringProperty("name", info->Name());
+        }
+        aWriter.IntProperty("tid", static_cast<int>(info->ThreadId()));
+      aWriter.EndObject();
+    }
+  aWriter.EndArray();
+
+  aWriter.DoubleProperty("start", static_cast<double>(mozilla::tasktracer::GetStartTime()));
+#endif
+}
+
+
+void GeckoSampler::StreamMetaJSCustomObject(SpliceableJSONWriter& aWriter)
+{
+  aWriter.IntProperty("version", 3);
+  aWriter.DoubleProperty("interval", interval());
+  aWriter.IntProperty("stackwalk", mUseStackWalk);
+
+#ifndef SPS_STANDALONE
+  mozilla::TimeDuration delta = mozilla::TimeStamp::Now() - sStartTime;
+  aWriter.DoubleProperty("startTime", static_cast<double>(PR_Now()/1000.0 - delta.ToMilliseconds()));
+
+  aWriter.IntProperty("processType", XRE_GetProcessType());
+
+  nsresult res;
+  nsCOMPtr<nsIHttpProtocolHandler> http = do_GetService(NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "http", &res);
+  if (!NS_FAILED(res)) {
+    nsAutoCString string;
+
+    res = http->GetPlatform(string);
+    if (!NS_FAILED(res))
+      aWriter.StringProperty("platform", string.Data());
+
+    res = http->GetOscpu(string);
+    if (!NS_FAILED(res))
+      aWriter.StringProperty("oscpu", string.Data());
+
+    res = http->GetMisc(string);
+    if (!NS_FAILED(res))
+      aWriter.StringProperty("misc", string.Data());
+  }
+
+  nsCOMPtr<nsIXULRuntime> runtime = do_GetService("@mozilla.org/xre/runtime;1");
+  if (runtime) {
+    nsAutoCString string;
+
+    res = runtime->GetXPCOMABI(string);
+    if (!NS_FAILED(res))
+      aWriter.StringProperty("abi", string.Data());
+
+    res = runtime->GetWidgetToolkit(string);
+    if (!NS_FAILED(res))
+      aWriter.StringProperty("toolkit", string.Data());
+  }
+
+  nsCOMPtr<nsIXULAppInfo> appInfo = do_GetService("@mozilla.org/xre/app-info;1");
+  if (appInfo) {
+    nsAutoCString string;
+
+    res = appInfo->GetName(string);
+    if (!NS_FAILED(res))
+      aWriter.StringProperty("product", string.Data());
+  }
+#endif
+}
+
+void GeckoSampler::ToStreamAsJSON(std::ostream& stream, double aSinceTime)
+{
+  SpliceableJSONWriter b(mozilla::MakeUnique<OStreamJSONWriteFunc>(stream));
+  StreamJSON(b, aSinceTime);
+}
+
+#ifndef SPS_STANDALONE
+JSObject* GeckoSampler::ToJSObject(JSContext *aCx, double aSinceTime)
+{
+  JS::RootedValue val(aCx);
+  {
+    UniquePtr<char[]> buf = ToJSON(aSinceTime);
+    NS_ConvertUTF8toUTF16 js_string(nsDependentCString(buf.get()));
+    MOZ_ALWAYS_TRUE(JS_ParseJSON(aCx, static_cast<const char16_t*>(js_string.get()),
+                                 js_string.Length(), &val));
+  }
+  return &val.toObject();
+}
+
+void GeckoSampler::GetGatherer(nsISupports** aRetVal)
+{
+  if (!aRetVal || NS_WARN_IF(!mGatherer)) {
+    return;
+  }
+  NS_ADDREF(*aRetVal = mGatherer);
+}
+#endif
+
+UniquePtr<char[]> GeckoSampler::ToJSON(double aSinceTime)
+{
+  SpliceableChunkedJSONWriter b;
+  StreamJSON(b, aSinceTime);
+  return b.WriteFunc()->CopyData();
+}
+
+void GeckoSampler::ToJSObjectAsync(double aSinceTime,
+                                  mozilla::dom::Promise* aPromise)
+{
+  if (NS_WARN_IF(!mGatherer)) {
+    return;
+  }
+
+  mGatherer->Start(aSinceTime, aPromise);
+}
+
+struct SubprocessClosure {
+  explicit SubprocessClosure(SpliceableJSONWriter* aWriter)
+    : mWriter(aWriter)
+  {}
+
+  SpliceableJSONWriter* mWriter;
+};
+
+void SubProcessCallback(const char* aProfile, void* aClosure)
+{
+  // Called by the observer to get their profile data included
+  // as a sub profile
+  SubprocessClosure* closure = (SubprocessClosure*)aClosure;
+
+  // Add the string profile into the profile
+  closure->mWriter->StringElement(aProfile);
+}
+
+
+#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
+static
+void BuildJavaThreadJSObject(SpliceableJSONWriter& aWriter)
+{
+  aWriter.StringProperty("name", "Java Main Thread");
+
+  aWriter.StartArrayProperty("samples");
+
+    // for each sample
+    for (int sampleId = 0; true; sampleId++) {
+      bool firstRun = true;
+      // for each frame
+      for (int frameId = 0; true; frameId++) {
+        jni::String::LocalRef frameName =
+            java::GeckoJavaSampler::GetFrameName(0, sampleId, frameId);
+        // when we run out of frames, we stop looping
+        if (!frameName) {
+          // if we found at least one frame, we have objects to close
+          if (!firstRun) {
+              aWriter.EndArray();
+            aWriter.EndObject();
+          }
+          break;
+        }
+        // the first time around, open the sample object and frames array
+        if (firstRun) {
+          firstRun = false;
+
+          double sampleTime =
+              java::GeckoJavaSampler::GetSampleTime(0, sampleId);
+
+          aWriter.StartObjectElement();
+            aWriter.DoubleProperty("time", sampleTime);
+
+            aWriter.StartArrayProperty("frames");
+        }
+        // add a frame to the sample
+        aWriter.StartObjectElement();
+          aWriter.StringProperty("location",
+                                 frameName->ToCString().BeginReading());
+        aWriter.EndObject();
+      }
+      // if we found no frames for this sample, we are done
+      if (firstRun) {
+        break;
+      }
+    }
+
+  aWriter.EndArray();
+}
+#endif
+
+void GeckoSampler::StreamJSON(SpliceableJSONWriter& aWriter, double aSinceTime)
+{
+  aWriter.Start(SpliceableJSONWriter::SingleLineStyle);
+  {
+    // Put shared library info
+    aWriter.StringProperty("libs", GetSharedLibraryInfoStringInternal().c_str());
+
+    // Put meta data
+    aWriter.StartObjectProperty("meta");
+      StreamMetaJSCustomObject(aWriter);
+    aWriter.EndObject();
+
+    // Data of TaskTracer doesn't belong in the circular buffer.
+    if (TaskTracer()) {
+      aWriter.StartObjectProperty("tasktracer");
+      StreamTaskTracer(aWriter);
+      aWriter.EndObject();
+    }
+
+    // Lists the samples for each ThreadProfile
+    aWriter.StartArrayProperty("threads");
+    {
+      SetPaused(true);
+
+      {
+        ::MutexAutoLock lock(*sRegisteredThreadsMutex);
+
+        for (size_t i = 0; i < sRegisteredThreads->size(); i++) {
+          // Thread not being profiled, skip it
+          if (!sRegisteredThreads->at(i)->Profile())
+            continue;
+
+          // Note that we intentionally include ThreadProfile which
+          // have been marked for pending delete.
+
+          ::MutexAutoLock lock(sRegisteredThreads->at(i)->Profile()->GetMutex());
+
+          sRegisteredThreads->at(i)->Profile()->StreamJSON(aWriter, aSinceTime);
+        }
+      }
+
+#ifndef SPS_STANDALONE
+      if (Sampler::CanNotifyObservers()) {
+        // Send a event asking any subprocesses (plugins) to
+        // give us their information
+        SubprocessClosure closure(&aWriter);
+        nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
+        if (os) {
+          RefPtr<ProfileSaveEvent> pse = new ProfileSaveEvent(SubProcessCallback, &closure);
+          os->NotifyObservers(pse, "profiler-subprocess", nullptr);
+        }
+      }
+
+  #if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
+      if (ProfileJava()) {
+        java::GeckoJavaSampler::Pause();
+
+        aWriter.Start();
+        {
+          BuildJavaThreadJSObject(aWriter);
+        }
+        aWriter.End();
+
+        java::GeckoJavaSampler::Unpause();
+      }
+  #endif
+#endif
+
+      SetPaused(false);
+    }
+    aWriter.EndArray();
+  }
+  aWriter.End();
+}
+
+void GeckoSampler::FlushOnJSShutdown(JSContext* aContext)
+{
+#ifndef SPS_STANDALONE
+  SetPaused(true);
+
+  {
+    ::MutexAutoLock lock(*sRegisteredThreadsMutex);
+
+    for (size_t i = 0; i < sRegisteredThreads->size(); i++) {
+      // Thread not being profiled, skip it.
+      if (!sRegisteredThreads->at(i)->Profile() ||
+          sRegisteredThreads->at(i)->IsPendingDelete()) {
+        continue;
+      }
+
+      // Thread not profiling the context that's going away, skip it.
+      if (sRegisteredThreads->at(i)->Profile()->GetPseudoStack()->mContext != aContext) {
+        continue;
+      }
+
+      ::MutexAutoLock lock(sRegisteredThreads->at(i)->Profile()->GetMutex());
+      sRegisteredThreads->at(i)->Profile()->FlushSamplesAndMarkers();
+    }
+  }
+
+  SetPaused(false);
+#endif
+}
+
+void PseudoStack::flushSamplerOnJSShutdown()
+{
+#ifndef SPS_STANDALONE
+  MOZ_ASSERT(mContext);
+  GeckoSampler* t = tlsTicker.get();
+  if (t) {
+    t->FlushOnJSShutdown(mContext);
+  }
+#endif
+}
+
+// END SaveProfileTask et al
+////////////////////////////////////////////////////////////////////////
+
+static
+void addDynamicTag(ThreadProfile &aProfile, char aTagName, const char *aStr)
+{
+  aProfile.addTag(ProfileEntry(aTagName, ""));
+  // Add one to store the null termination
+  size_t strLen = strlen(aStr) + 1;
+  for (size_t j = 0; j < strLen;) {
+    // Store as many characters in the void* as the platform allows
+    char text[sizeof(void*)];
+    size_t len = sizeof(void*)/sizeof(char);
+    if (j+len >= strLen) {
+      len = strLen - j;
+    }
+    memcpy(text, &aStr[j], len);
+    j += sizeof(void*)/sizeof(char);
+    // Cast to *((void**) to pass the text data to a void*
+    aProfile.addTag(ProfileEntry('d', *((void**)(&text[0]))));
+  }
+}
+
+static
+void addPseudoEntry(volatile StackEntry &entry, ThreadProfile &aProfile,
+                    PseudoStack *stack, void *lastpc)
+{
+  // Pseudo-frames with the BEGIN_PSEUDO_JS flag are just annotations
+  // and should not be recorded in the profile.
+  if (entry.hasFlag(StackEntry::BEGIN_PSEUDO_JS))
+    return;
+
+  int lineno = -1;
+
+  // First entry has tagName 's' (start)
+  // Check for magic pointer bit 1 to indicate copy
+  const char* sampleLabel = entry.label();
+  if (entry.isCopyLabel()) {
+    // Store the string using 1 or more 'd' (dynamic) tags
+    // that will happen to the preceding tag
+
+    addDynamicTag(aProfile, 'c', sampleLabel);
+#ifndef SPS_STANDALONE
+    if (entry.isJs()) {
+      JSScript* script = entry.script();
+      if (script) {
+        if (!entry.pc()) {
+          // The JIT only allows the top-most entry to have a nullptr pc
+          MOZ_ASSERT(&entry == &stack->mStack[stack->stackSize() - 1]);
+          // If stack-walking was disabled, then that's just unfortunate
+          if (lastpc) {
+            jsbytecode *jspc = js::ProfilingGetPC(stack->mContext, script,
+                                                  lastpc);
+            if (jspc) {
+              lineno = JS_PCToLineNumber(script, jspc);
+            }
+          }
+        } else {
+          lineno = JS_PCToLineNumber(script, entry.pc());
+        }
+      }
+    } else {
+      lineno = entry.line();
+    }
+#endif
+  } else {
+    aProfile.addTag(ProfileEntry('c', sampleLabel));
+
+    // XXX: Bug 1010578. Don't assume a CPP entry and try to get the
+    // line for js entries as well.
+    if (entry.isCpp()) {
+      lineno = entry.line();
+    }
+  }
+
+  if (lineno != -1) {
+    aProfile.addTag(ProfileEntry('n', lineno));
+  }
+
+  uint32_t category = entry.category();
+  MOZ_ASSERT(!(category & StackEntry::IS_CPP_ENTRY));
+  MOZ_ASSERT(!(category & StackEntry::FRAME_LABEL_COPY));
+
+  if (category) {
+    aProfile.addTag(ProfileEntry('y', (int)category));
+  }
+}
+
+struct NativeStack
+{
+  void** pc_array;
+  void** sp_array;
+  size_t size;
+  size_t count;
+};
+
+mozilla::Atomic<bool> WALKING_JS_STACK(false);
+
+struct AutoWalkJSStack {
+  bool walkAllowed;
+
+  AutoWalkJSStack() : walkAllowed(false) {
+    walkAllowed = WALKING_JS_STACK.compareExchange(false, true);
+  }
+
+  ~AutoWalkJSStack() {
+    if (walkAllowed)
+        WALKING_JS_STACK = false;
+  }
+};
+
+static
+void mergeStacksIntoProfile(ThreadProfile& aProfile, TickSample* aSample, NativeStack& aNativeStack)
+{
+  PseudoStack* pseudoStack = aProfile.GetPseudoStack();
+  volatile StackEntry *pseudoFrames = pseudoStack->mStack;
+  uint32_t pseudoCount = pseudoStack->stackSize();
+
+  // Make a copy of the JS stack into a JSFrame array. This is necessary since,
+  // like the native stack, the JS stack is iterated youngest-to-oldest and we
+  // need to iterate oldest-to-youngest when adding entries to aProfile.
+
+  // Synchronous sampling reports an invalid buffer generation to
+  // ProfilingFrameIterator to avoid incorrectly resetting the generation of
+  // sampled JIT entries inside the JS engine. See note below concerning 'J'
+  // entries.
+  uint32_t startBufferGen;
+  if (aSample->isSamplingCurrentThread) {
+    startBufferGen = UINT32_MAX;
+  } else {
+    startBufferGen = aProfile.bufferGeneration();
+  }
+  uint32_t jsCount = 0;
+#ifndef SPS_STANDALONE
+  JS::ProfilingFrameIterator::Frame jsFrames[1000];
+  // Only walk jit stack if profiling frame iterator is turned on.
+  if (pseudoStack->mContext && JS::IsProfilingEnabledForContext(pseudoStack->mContext)) {
+    AutoWalkJSStack autoWalkJSStack;
+    const uint32_t maxFrames = mozilla::ArrayLength(jsFrames);
+
+    if (aSample && autoWalkJSStack.walkAllowed) {
+      JS::ProfilingFrameIterator::RegisterState registerState;
+      registerState.pc = aSample->pc;
+      registerState.sp = aSample->sp;
+#ifdef ENABLE_ARM_LR_SAVING
+      registerState.lr = aSample->lr;
+#endif
+
+      JS::ProfilingFrameIterator jsIter(pseudoStack->mContext,
+                                        registerState,
+                                        startBufferGen);
+      for (; jsCount < maxFrames && !jsIter.done(); ++jsIter) {
+        // See note below regarding 'J' entries.
+        if (aSample->isSamplingCurrentThread || jsIter.isWasm()) {
+          uint32_t extracted = jsIter.extractStack(jsFrames, jsCount, maxFrames);
+          jsCount += extracted;
+          if (jsCount == maxFrames)
+            break;
+        } else {
+          mozilla::Maybe<JS::ProfilingFrameIterator::Frame> frame =
+            jsIter.getPhysicalFrameWithoutLabel();
+          if (frame.isSome())
+            jsFrames[jsCount++] = mozilla::Move(frame.ref());
+        }
+      }
+    }
+  }
+#endif
+
+  // Start the sample with a root entry.
+  aProfile.addTag(ProfileEntry('s', "(root)"));
+
+  // While the pseudo-stack array is ordered oldest-to-youngest, the JS and
+  // native arrays are ordered youngest-to-oldest. We must add frames to
+  // aProfile oldest-to-youngest. Thus, iterate over the pseudo-stack forwards
+  // and JS and native arrays backwards. Note: this means the terminating
+  // condition jsIndex and nativeIndex is being < 0.
+  uint32_t pseudoIndex = 0;
+  int32_t jsIndex = jsCount - 1;
+  int32_t nativeIndex = aNativeStack.count - 1;
+
+  uint8_t *lastPseudoCppStackAddr = nullptr;
+
+  // Iterate as long as there is at least one frame remaining.
+  while (pseudoIndex != pseudoCount || jsIndex >= 0 || nativeIndex >= 0) {
+    // There are 1 to 3 frames available. Find and add the oldest.
+
+    uint8_t *pseudoStackAddr = nullptr;
+    uint8_t *jsStackAddr = nullptr;
+    uint8_t *nativeStackAddr = nullptr;
+
+    if (pseudoIndex != pseudoCount) {
+      volatile StackEntry &pseudoFrame = pseudoFrames[pseudoIndex];
+
+      if (pseudoFrame.isCpp())
+        lastPseudoCppStackAddr = (uint8_t *) pseudoFrame.stackAddress();
+
+#ifndef SPS_STANDALONE
+      // Skip any pseudo-stack JS frames which are marked isOSR
+      // Pseudostack frames are marked isOSR when the JS interpreter
+      // enters a jit frame on a loop edge (via on-stack-replacement,
+      // or OSR).  To avoid both the pseudoframe and jit frame being
+      // recorded (and showing up twice), the interpreter marks the
+      // interpreter pseudostack entry with the OSR flag to ensure that
+      // it doesn't get counted.
+      if (pseudoFrame.isJs() && pseudoFrame.isOSR()) {
+          pseudoIndex++;
+          continue;
+      }
+#endif
+
+      MOZ_ASSERT(lastPseudoCppStackAddr);
+      pseudoStackAddr = lastPseudoCppStackAddr;
+    }
+
+#ifndef SPS_STANDALONE
+    if (jsIndex >= 0)
+      jsStackAddr = (uint8_t *) jsFrames[jsIndex].stackAddress;
+#endif
+
+    if (nativeIndex >= 0)
+      nativeStackAddr = (uint8_t *) aNativeStack.sp_array[nativeIndex];
+
+    // If there's a native stack entry which has the same SP as a
+    // pseudo stack entry, pretend we didn't see the native stack
+    // entry.  Ditto for a native stack entry which has the same SP as
+    // a JS stack entry.  In effect this means pseudo or JS entries
+    // trump conflicting native entries.
+    if (nativeStackAddr && (pseudoStackAddr == nativeStackAddr || jsStackAddr == nativeStackAddr)) {
+      nativeStackAddr = nullptr;
+      nativeIndex--;
+      MOZ_ASSERT(pseudoStackAddr || jsStackAddr);
+    }
+
+    // Sanity checks.
+    MOZ_ASSERT_IF(pseudoStackAddr, pseudoStackAddr != jsStackAddr &&
+                                   pseudoStackAddr != nativeStackAddr);
+    MOZ_ASSERT_IF(jsStackAddr, jsStackAddr != pseudoStackAddr &&
+                               jsStackAddr != nativeStackAddr);
+    MOZ_ASSERT_IF(nativeStackAddr, nativeStackAddr != pseudoStackAddr &&
+                                   nativeStackAddr != jsStackAddr);
+
+    // Check to see if pseudoStack frame is top-most.
+    if (pseudoStackAddr > jsStackAddr && pseudoStackAddr > nativeStackAddr) {
+      MOZ_ASSERT(pseudoIndex < pseudoCount);
+      volatile StackEntry &pseudoFrame = pseudoFrames[pseudoIndex];
+      addPseudoEntry(pseudoFrame, aProfile, pseudoStack, nullptr);
+      pseudoIndex++;
+      continue;
+    }
+
+#ifndef SPS_STANDALONE
+    // Check to see if JS jit stack frame is top-most
+    if (jsStackAddr > nativeStackAddr) {
+      MOZ_ASSERT(jsIndex >= 0);
+      const JS::ProfilingFrameIterator::Frame& jsFrame = jsFrames[jsIndex];
+
+      // Stringifying non-wasm JIT frames is delayed until streaming
+      // time. To re-lookup the entry in the JitcodeGlobalTable, we need to
+      // store the JIT code address ('J') in the circular buffer.
+      //
+      // Note that we cannot do this when we are sychronously sampling the
+      // current thread; that is, when called from profiler_get_backtrace. The
+      // captured backtrace is usually externally stored for an indeterminate
+      // amount of time, such as in nsRefreshDriver. Problematically, the
+      // stored backtrace may be alive across a GC during which the profiler
+      // itself is disabled. In that case, the JS engine is free to discard
+      // its JIT code. This means that if we inserted such 'J' entries into
+      // the buffer, nsRefreshDriver would now be holding on to a backtrace
+      // with stale JIT code return addresses.
+      if (aSample->isSamplingCurrentThread ||
+          jsFrame.kind == JS::ProfilingFrameIterator::Frame_Wasm) {
+        addDynamicTag(aProfile, 'c', jsFrame.label.get());
+      } else {
+        MOZ_ASSERT(jsFrame.kind == JS::ProfilingFrameIterator::Frame_Ion ||
+                   jsFrame.kind == JS::ProfilingFrameIterator::Frame_Baseline);
+        aProfile.addTag(ProfileEntry('J', jsFrames[jsIndex].returnAddress));
+      }
+
+      jsIndex--;
+      continue;
+    }
+#endif
+
+    // If we reach here, there must be a native stack entry and it must be the
+    // greatest entry.
+    if (nativeStackAddr) {
+      MOZ_ASSERT(nativeIndex >= 0);
+      aProfile
+        .addTag(ProfileEntry('l', (void*)aNativeStack.pc_array[nativeIndex]));
+    }
+    if (nativeIndex >= 0) {
+      nativeIndex--;
+    }
+  }
+
+#ifndef SPS_STANDALONE
+  // Update the JS context with the current profile sample buffer generation.
+  //
+  // Do not do this for synchronous sampling, which create their own
+  // ProfileBuffers.
+  if (!aSample->isSamplingCurrentThread && pseudoStack->mContext) {
+    MOZ_ASSERT(aProfile.bufferGeneration() >= startBufferGen);
+    uint32_t lapCount = aProfile.bufferGeneration() - startBufferGen;
+    JS::UpdateJSContextProfilerSampleBufferGen(pseudoStack->mContext,
+                                               aProfile.bufferGeneration(),
+                                               lapCount);
+  }
+#endif
+}
+
+#ifdef USE_NS_STACKWALK
+static
+void StackWalkCallback(uint32_t aFrameNumber, void* aPC, void* aSP,
+                       void* aClosure)
+{
+  NativeStack* nativeStack = static_cast<NativeStack*>(aClosure);
+  MOZ_ASSERT(nativeStack->count < nativeStack->size);
+  nativeStack->sp_array[nativeStack->count] = aSP;
+  nativeStack->pc_array[nativeStack->count] = aPC;
+  nativeStack->count++;
+}
+
+void GeckoSampler::doNativeBacktrace(ThreadProfile &aProfile, TickSample* aSample)
+{
+  void* pc_array[1000];
+  void* sp_array[1000];
+  NativeStack nativeStack = {
+    pc_array,
+    sp_array,
+    mozilla::ArrayLength(pc_array),
+    0
+  };
+
+  // Start with the current function. We use 0 as the frame number here because
+  // the FramePointerStackWalk() and MozStackWalk() calls below will use 1..N.
+  // This is a bit weird but it doesn't matter because StackWalkCallback()
+  // doesn't use the frame number argument.
+  StackWalkCallback(/* frameNumber */ 0, aSample->pc, aSample->sp, &nativeStack);
+
+  uint32_t maxFrames = uint32_t(nativeStack.size - nativeStack.count);
+  // win X64 doesn't support disabling frame pointers emission so we need
+  // to fallback to using StackWalk64 which is slower.
+#if defined(XP_MACOSX) || (defined(XP_WIN) && !defined(V8_HOST_ARCH_X64))
+  void *stackEnd = aSample->threadProfile->GetStackTop();
+  bool rv = true;
+  if (aSample->fp >= aSample->sp && aSample->fp <= stackEnd)
+    rv = FramePointerStackWalk(StackWalkCallback, /* skipFrames */ 0,
+                               maxFrames, &nativeStack,
+                               reinterpret_cast<void**>(aSample->fp), stackEnd);
+#else
+  void *platformData = nullptr;
+
+  uintptr_t thread = GetThreadHandle(aSample->threadProfile->GetPlatformData());
+  MOZ_ASSERT(thread);
+  bool rv = MozStackWalk(StackWalkCallback, /* skipFrames */ 0, maxFrames,
+                             &nativeStack, thread, platformData);
+#endif
+  if (rv)
+    mergeStacksIntoProfile(aProfile, aSample, nativeStack);
+}
+#endif
+
+
+#ifdef USE_EHABI_STACKWALK
+void GeckoSampler::doNativeBacktrace(ThreadProfile &aProfile, TickSample* aSample)
+{
+  void *pc_array[1000];
+  void *sp_array[1000];
+  NativeStack nativeStack = {
+    pc_array,
+    sp_array,
+    mozilla::ArrayLength(pc_array),
+    0
+  };
+
+  const mcontext_t *mcontext = &reinterpret_cast<ucontext_t *>(aSample->context)->uc_mcontext;
+  mcontext_t savedContext;
+  PseudoStack *pseudoStack = aProfile.GetPseudoStack();
+
+  nativeStack.count = 0;
+  // The pseudostack contains an "EnterJIT" frame whenever we enter
+  // JIT code with profiling enabled; the stack pointer value points
+  // the saved registers.  We use this to unwind resume unwinding
+  // after encounting JIT code.
+  for (uint32_t i = pseudoStack->stackSize(); i > 0; --i) {
+    // The pseudostack grows towards higher indices, so we iterate
+    // backwards (from callee to caller).
+    volatile StackEntry &entry = pseudoStack->mStack[i - 1];
+    if (!entry.isJs() && strcmp(entry.label(), "EnterJIT") == 0) {
+      // Found JIT entry frame.  Unwind up to that point (i.e., force
+      // the stack walk to stop before the block of saved registers;
+      // note that it yields nondecreasing stack pointers), then restore
+      // the saved state.
+      uint32_t *vSP = reinterpret_cast<uint32_t*>(entry.stackAddress());
+
+      nativeStack.count += EHABIStackWalk(*mcontext,
+                                          /* stackBase = */ vSP,
+                                          sp_array + nativeStack.count,
+                                          pc_array + nativeStack.count,
+                                          nativeStack.size - nativeStack.count);
+
+      memset(&savedContext, 0, sizeof(savedContext));
+      // See also: struct EnterJITStack in js/src/jit/arm/Trampoline-arm.cpp
+      savedContext.arm_r4 = *vSP++;
+      savedContext.arm_r5 = *vSP++;
+      savedContext.arm_r6 = *vSP++;
+      savedContext.arm_r7 = *vSP++;
+      savedContext.arm_r8 = *vSP++;
+      savedContext.arm_r9 = *vSP++;
+      savedContext.arm_r10 = *vSP++;
+      savedContext.arm_fp = *vSP++;
+      savedContext.arm_lr = *vSP++;
+      savedContext.arm_sp = reinterpret_cast<uint32_t>(vSP);
+      savedContext.arm_pc = savedContext.arm_lr;
+      mcontext = &savedContext;
+    }
+  }
+
+  // Now unwind whatever's left (starting from either the last EnterJIT
+  // frame or, if no EnterJIT was found, the original registers).
+  nativeStack.count += EHABIStackWalk(*mcontext,
+                                      aProfile.GetStackTop(),
+                                      sp_array + nativeStack.count,
+                                      pc_array + nativeStack.count,
+                                      nativeStack.size - nativeStack.count);
+
+  mergeStacksIntoProfile(aProfile, aSample, nativeStack);
+}
+#endif
+
+
+#ifdef USE_LUL_STACKWALK
+void GeckoSampler::doNativeBacktrace(ThreadProfile &aProfile, TickSample* aSample)
+{
+  const mcontext_t* mc
+    = &reinterpret_cast<ucontext_t *>(aSample->context)->uc_mcontext;
+
+  lul::UnwindRegs startRegs;
+  memset(&startRegs, 0, sizeof(startRegs));
+
+# if defined(SPS_PLAT_amd64_linux)
+  startRegs.xip = lul::TaggedUWord(mc->gregs[REG_RIP]);
+  startRegs.xsp = lul::TaggedUWord(mc->gregs[REG_RSP]);
+  startRegs.xbp = lul::TaggedUWord(mc->gregs[REG_RBP]);
+# elif defined(SPS_PLAT_arm_android)
+  startRegs.r15 = lul::TaggedUWord(mc->arm_pc);
+  startRegs.r14 = lul::TaggedUWord(mc->arm_lr);
+  startRegs.r13 = lul::TaggedUWord(mc->arm_sp);
+  startRegs.r12 = lul::TaggedUWord(mc->arm_ip);
+  startRegs.r11 = lul::TaggedUWord(mc->arm_fp);
+  startRegs.r7  = lul::TaggedUWord(mc->arm_r7);
+# elif defined(SPS_PLAT_x86_linux) || defined(SPS_PLAT_x86_android)
+  startRegs.xip = lul::TaggedUWord(mc->gregs[REG_EIP]);
+  startRegs.xsp = lul::TaggedUWord(mc->gregs[REG_ESP]);
+  startRegs.xbp = lul::TaggedUWord(mc->gregs[REG_EBP]);
+# else
+#   error "Unknown plat"
+# endif
+
+  /* Copy up to N_STACK_BYTES from rsp-REDZONE upwards, but not
+     going past the stack's registered top point.  Do some basic
+     sanity checks too.  This assumes that the TaggedUWord holding
+     the stack pointer value is valid, but it should be, since it
+     was constructed that way in the code just above. */
+
+  lul::StackImage stackImg;
+
+  {
+#   if defined(SPS_PLAT_amd64_linux)
+    uintptr_t rEDZONE_SIZE = 128;
+    uintptr_t start = startRegs.xsp.Value() - rEDZONE_SIZE;
+#   elif defined(SPS_PLAT_arm_android)
+    uintptr_t rEDZONE_SIZE = 0;
+    uintptr_t start = startRegs.r13.Value() - rEDZONE_SIZE;
+#   elif defined(SPS_PLAT_x86_linux) || defined(SPS_PLAT_x86_android)
+    uintptr_t rEDZONE_SIZE = 0;
+    uintptr_t start = startRegs.xsp.Value() - rEDZONE_SIZE;
+#   else
+#     error "Unknown plat"
+#   endif
+    uintptr_t end   = reinterpret_cast<uintptr_t>(aProfile.GetStackTop());
+    uintptr_t ws    = sizeof(void*);
+    start &= ~(ws-1);
+    end   &= ~(ws-1);
+    uintptr_t nToCopy = 0;
+    if (start < end) {
+      nToCopy = end - start;
+      if (nToCopy > lul::N_STACK_BYTES)
+        nToCopy = lul::N_STACK_BYTES;
+    }
+    MOZ_ASSERT(nToCopy <= lul::N_STACK_BYTES);
+    stackImg.mLen       = nToCopy;
+    stackImg.mStartAvma = start;
+    if (nToCopy > 0) {
+      memcpy(&stackImg.mContents[0], (void*)start, nToCopy);
+      (void)VALGRIND_MAKE_MEM_DEFINED(&stackImg.mContents[0], nToCopy);
+    }
+  }
+
+  // The maximum number of frames that LUL will produce.  Setting it
+  // too high gives a risk of it wasting a lot of time looping on
+  // corrupted stacks.
+  const int MAX_NATIVE_FRAMES = 256;
+
+  size_t scannedFramesAllowed = 0;
+
+  uintptr_t framePCs[MAX_NATIVE_FRAMES];
+  uintptr_t frameSPs[MAX_NATIVE_FRAMES];
+  size_t framesAvail = mozilla::ArrayLength(framePCs);
+  size_t framesUsed  = 0;
+  size_t scannedFramesAcquired = 0;
+  sLUL->Unwind( &framePCs[0], &frameSPs[0],
+                &framesUsed, &scannedFramesAcquired,
+                framesAvail, scannedFramesAllowed,
+                &startRegs, &stackImg );
+
+  NativeStack nativeStack = {
+    reinterpret_cast<void**>(framePCs),
+    reinterpret_cast<void**>(frameSPs),
+    mozilla::ArrayLength(framePCs),
+    0
+  };
+
+  nativeStack.count = framesUsed;
+
+  mergeStacksIntoProfile(aProfile, aSample, nativeStack);
+
+  // Update stats in the LUL stats object.  Unfortunately this requires
+  // three global memory operations.
+  sLUL->mStats.mContext += 1;
+  sLUL->mStats.mCFI     += framesUsed - 1 - scannedFramesAcquired;
+  sLUL->mStats.mScanned += scannedFramesAcquired;
+}
+#endif
+
+
+static
+void doSampleStackTrace(ThreadProfile &aProfile, TickSample *aSample, bool aAddLeafAddresses)
+{
+  NativeStack nativeStack = { nullptr, nullptr, 0, 0 };
+  mergeStacksIntoProfile(aProfile, aSample, nativeStack);
+
+#ifdef ENABLE_SPS_LEAF_DATA
+  if (aSample && aAddLeafAddresses) {
+    aProfile.addTag(ProfileEntry('l', (void*)aSample->pc));
+#ifdef ENABLE_ARM_LR_SAVING
+    aProfile.addTag(ProfileEntry('L', (void*)aSample->lr));
+#endif
+  }
+#endif
+}
+
+void GeckoSampler::Tick(TickSample* sample)
+{
+  // Don't allow for ticks to happen within other ticks.
+  InplaceTick(sample);
+}
+
+void GeckoSampler::InplaceTick(TickSample* sample)
+{
+  ThreadProfile& currThreadProfile = *sample->threadProfile;
+
+  currThreadProfile.addTag(ProfileEntry('T', currThreadProfile.ThreadId()));
+
+  if (sample) {
+    mozilla::TimeDuration delta = sample->timestamp - sStartTime;
+    currThreadProfile.addTag(ProfileEntry('t', delta.ToMilliseconds()));
+  }
+
+  PseudoStack* stack = currThreadProfile.GetPseudoStack();
+
+#if defined(USE_NS_STACKWALK) || defined(USE_EHABI_STACKWALK) || \
+    defined(USE_LUL_STACKWALK)
+  if (mUseStackWalk) {
+    doNativeBacktrace(currThreadProfile, sample);
+  } else {
+    doSampleStackTrace(currThreadProfile, sample, mAddLeafAddresses);
+  }
+#else
+  doSampleStackTrace(currThreadProfile, sample, mAddLeafAddresses);
+#endif
+
+  // Don't process the PeudoStack's markers if we're
+  // synchronously sampling the current thread.
+  if (!sample->isSamplingCurrentThread) {
+    ProfilerMarkerLinkedList* pendingMarkersList = stack->getPendingMarkers();
+    while (pendingMarkersList && pendingMarkersList->peek()) {
+      ProfilerMarker* marker = pendingMarkersList->popHead();
+      currThreadProfile.addStoredMarker(marker);
+      currThreadProfile.addTag(ProfileEntry('m', marker));
+    }
+  }
+
+#ifndef SPS_STANDALONE
+  if (sample && currThreadProfile.GetThreadResponsiveness()->HasData()) {
+    mozilla::TimeDuration delta = currThreadProfile.GetThreadResponsiveness()->GetUnresponsiveDuration(sample->timestamp);
+    currThreadProfile.addTag(ProfileEntry('r', delta.ToMilliseconds()));
+  }
+#endif
+
+  // rssMemory is equal to 0 when we are not recording.
+  if (sample && sample->rssMemory != 0) {
+    currThreadProfile.addTag(ProfileEntry('R', static_cast<double>(sample->rssMemory)));
+  }
+
+  // ussMemory is equal to 0 when we are not recording.
+  if (sample && sample->ussMemory != 0) {
+    currThreadProfile.addTag(ProfileEntry('U', static_cast<double>(sample->ussMemory)));
+  }
+
+#if defined(XP_WIN)
+  if (mProfilePower) {
+    mIntelPowerGadget->TakeSample();
+    currThreadProfile.addTag(ProfileEntry('p', static_cast<double>(mIntelPowerGadget->GetTotalPackagePowerInWatts())));
+  }
+#endif
+
+  if (sLastFrameNumber != sFrameNumber) {
+    currThreadProfile.addTag(ProfileEntry('f', sFrameNumber));
+    sLastFrameNumber = sFrameNumber;
+  }
+}
+
+namespace {
+
+SyncProfile* NewSyncProfile()
+{
+  PseudoStack* stack = tlsPseudoStack.get();
+  if (!stack) {
+    MOZ_ASSERT(stack);
+    return nullptr;
+  }
+  Thread::tid_t tid = Thread::GetCurrentId();
+
+  ThreadInfo* info = new ThreadInfo("SyncProfile", tid, false, stack, nullptr);
+  SyncProfile* profile = new SyncProfile(info, GET_BACKTRACE_DEFAULT_ENTRY);
+  return profile;
+}
+
+} // namespace
+
+SyncProfile* GeckoSampler::GetBacktrace()
+{
+  SyncProfile* profile = NewSyncProfile();
+
+  TickSample sample;
+  sample.threadProfile = profile;
+
+#if defined(HAVE_NATIVE_UNWIND) || defined(USE_LUL_STACKWALK)
+#if defined(XP_WIN) || defined(LINUX)
+  tickcontext_t context;
+  sample.PopulateContext(&context);
+#elif defined(XP_MACOSX)
+  sample.PopulateContext(nullptr);
+#endif
+#endif
+
+  sample.isSamplingCurrentThread = true;
+  sample.timestamp = mozilla::TimeStamp::Now();
+
+  profile->BeginUnwind();
+  Tick(&sample);
+  profile->EndUnwind();
+
+  return profile;
+}
+
+void
+GeckoSampler::GetBufferInfo(uint32_t *aCurrentPosition, uint32_t *aTotalSize, uint32_t *aGeneration)
+{
+  *aCurrentPosition = mBuffer->mWritePos;
+  *aTotalSize = mBuffer->mEntrySize;
+  *aGeneration = mBuffer->mGeneration;
+}
diff --git a/tools/profiler/core/GeckoSampler.h b/tools/profiler/core/GeckoSampler.h
new file mode 100644
index 000000000..da1fdfe43
--- /dev/null
+++ b/tools/profiler/core/GeckoSampler.h
@@ -0,0 +1,181 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GeckoSampler_h
+#define GeckoSampler_h
+
+#include "platform.h"
+#include "ProfileEntry.h"
+#include "mozilla/Vector.h"
+#include "ThreadProfile.h"
+#include "ThreadInfo.h"
+#ifndef SPS_STANDALONE
+#include "IntelPowerGadget.h"
+#endif
+#ifdef MOZ_TASK_TRACER
+#include "GeckoTaskTracer.h"
+#endif
+
+#include <algorithm>
+
+namespace mozilla {
+class ProfileGatherer;
+} // namespace mozilla
+
+typedef mozilla::Vector<std::string> ThreadNameFilterList;
+typedef mozilla::Vector<std::string> FeatureList;
+
+static bool
+threadSelected(ThreadInfo* aInfo, const ThreadNameFilterList &aThreadNameFilters) {
+  if (aThreadNameFilters.empty()) {
+    return true;
+  }
+
+  std::string name = aInfo->Name();
+  std::transform(name.begin(), name.end(), name.begin(), ::tolower);
+
+  for (uint32_t i = 0; i < aThreadNameFilters.length(); ++i) {
+    std::string filter = aThreadNameFilters[i];
+    std::transform(filter.begin(), filter.end(), filter.begin(), ::tolower);
+
+    // Crude, non UTF-8 compatible, case insensitive substring search
+    if (name.find(filter) != std::string::npos) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+extern mozilla::TimeStamp sLastTracerEvent;
+extern int sFrameNumber;
+extern int sLastFrameNumber;
+
+class GeckoSampler: public Sampler {
+ public:
+  GeckoSampler(double aInterval, int aEntrySize,
+              const char** aFeatures, uint32_t aFeatureCount,
+              const char** aThreadNameFilters, uint32_t aFilterCount);
+  ~GeckoSampler();
+
+  void RegisterThread(ThreadInfo* aInfo) {
+    if (!aInfo->IsMainThread() && !mProfileThreads) {
+      return;
+    }
+
+    if (!threadSelected(aInfo, mThreadNameFilters)) {
+      return;
+    }
+
+    ThreadProfile* profile = new ThreadProfile(aInfo, mBuffer);
+    aInfo->SetProfile(profile);
+  }
+
+  // Called within a signal. This function must be reentrant
+  virtual void Tick(TickSample* sample) override;
+
+  // Immediately captures the calling thread's call stack and returns it.
+  virtual SyncProfile* GetBacktrace() override;
+
+  // Called within a signal. This function must be reentrant
+  virtual void RequestSave() override
+  {
+    mSaveRequested = true;
+#ifdef MOZ_TASK_TRACER
+    if (mTaskTracer) {
+      mozilla::tasktracer::StopLogging();
+    }
+#endif
+  }
+
+  virtual void HandleSaveRequest() override;
+  virtual void DeleteExpiredMarkers() override;
+
+  ThreadProfile* GetPrimaryThreadProfile()
+  {
+    if (!mPrimaryThreadProfile) {
+      ::MutexAutoLock lock(*sRegisteredThreadsMutex);
+
+      for (uint32_t i = 0; i < sRegisteredThreads->size(); i++) {
+        ThreadInfo* info = sRegisteredThreads->at(i);
+        if (info->IsMainThread() && !info->IsPendingDelete()) {
+          mPrimaryThreadProfile = info->Profile();
+          break;
+        }
+      }
+    }
+
+    return mPrimaryThreadProfile;
+  }
+
+  void ToStreamAsJSON(std::ostream& stream, double aSinceTime = 0);
+#ifndef SPS_STANDALONE
+  virtual JSObject *ToJSObject(JSContext *aCx, double aSinceTime = 0);
+  void GetGatherer(nsISupports** aRetVal);
+#endif
+  mozilla::UniquePtr<char[]> ToJSON(double aSinceTime = 0);
+  virtual void ToJSObjectAsync(double aSinceTime = 0, mozilla::dom::Promise* aPromise = 0);
+  void StreamMetaJSCustomObject(SpliceableJSONWriter& aWriter);
+  void StreamTaskTracer(SpliceableJSONWriter& aWriter);
+  void FlushOnJSShutdown(JSContext* aContext);
+  bool ProfileJS() const { return mProfileJS; }
+  bool ProfileJava() const { return mProfileJava; }
+  bool ProfileGPU() const { return mProfileGPU; }
+  bool ProfilePower() const { return mProfilePower; }
+  bool ProfileThreads() const override { return mProfileThreads; }
+  bool InPrivacyMode() const { return mPrivacyMode; }
+  bool AddMainThreadIO() const { return mAddMainThreadIO; }
+  bool ProfileMemory() const { return mProfileMemory; }
+  bool TaskTracer() const { return mTaskTracer; }
+  bool LayersDump() const { return mLayersDump; }
+  bool DisplayListDump() const { return mDisplayListDump; }
+  bool ProfileRestyle() const { return mProfileRestyle; }
+  const ThreadNameFilterList& ThreadNameFilters() { return mThreadNameFilters; }
+  const FeatureList& Features() { return mFeatures; }
+
+  void GetBufferInfo(uint32_t *aCurrentPosition, uint32_t *aTotalSize, uint32_t *aGeneration);
+
+protected:
+  // Called within a signal. This function must be reentrant
+  virtual void InplaceTick(TickSample* sample);
+
+  // Not implemented on platforms which do not support backtracing
+  void doNativeBacktrace(ThreadProfile &aProfile, TickSample* aSample);
+
+  void StreamJSON(SpliceableJSONWriter& aWriter, double aSinceTime);
+
+  // This represent the application's main thread (SAMPLER_INIT)
+  ThreadProfile* mPrimaryThreadProfile;
+  RefPtr<ProfileBuffer> mBuffer;
+  bool mSaveRequested;
+  bool mAddLeafAddresses;
+  bool mUseStackWalk;
+  bool mProfileJS;
+  bool mProfileGPU;
+  bool mProfileThreads;
+  bool mProfileJava;
+  bool mProfilePower;
+  bool mLayersDump;
+  bool mDisplayListDump;
+  bool mProfileRestyle;
+
+  // Keep the thread filter to check against new thread that
+  // are started while profiling
+  ThreadNameFilterList mThreadNameFilters;
+  FeatureList mFeatures;
+  bool mPrivacyMode;
+  bool mAddMainThreadIO;
+  bool mProfileMemory;
+  bool mTaskTracer;
+#if defined(XP_WIN)
+  IntelPowerGadget* mIntelPowerGadget;
+#endif
+
+private:
+  RefPtr<mozilla::ProfileGatherer> mGatherer;
+};
+
+#endif
+
diff --git a/tools/profiler/core/IntelPowerGadget.cpp b/tools/profiler/core/IntelPowerGadget.cpp
new file mode 100644
index 000000000..fe267b80f
--- /dev/null
+++ b/tools/profiler/core/IntelPowerGadget.cpp
@@ -0,0 +1,310 @@
+/*

+ * Copyright 2013, Intel Corporation

+ *

+ * Licensed under the Apache License, Version 2.0 (the "License");

+ * you may not use this file except in compliance with the License.

+ * You may obtain a copy of the License at

+ *

+ * http://www.apache.org/licenses/LICENSE-2.0

+ *

+ * Unless required by applicable law or agreed to in writing, software

+ * distributed under the License is distributed on an "AS IS" BASIS,

+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

+ * See the License for the specific language governing permissions and

+ * limitations under the License.

+ *

+ * Author: Joe Olivas <joseph.k.olivas@intel.com>

+ */

+

+#include "nsDebug.h"

+#include "nsString.h"

+#include "IntelPowerGadget.h"

+#include "prenv.h"

+

+IntelPowerGadget::IntelPowerGadget() :

+    libpowergadget(nullptr),

+    Initialize(nullptr),

+    GetNumNodes(nullptr),

+    GetMsrName(nullptr),

+    GetMsrFunc(nullptr),

+    ReadMSR(nullptr),

+    WriteMSR(nullptr),

+    GetIAFrequency(nullptr),

+    GetTDP(nullptr),

+    GetMaxTemperature(nullptr),

+    GetThresholds(nullptr),

+    GetTemperature(nullptr),

+    ReadSample(nullptr),

+    GetSysTime(nullptr),

+    GetRDTSC(nullptr),

+    GetTimeInterval(nullptr),

+    GetBaseFrequency(nullptr),

+    GetPowerData(nullptr),

+    StartLog(nullptr),

+    StopLog(nullptr),

+    GetNumMsrs(nullptr),

+    packageMSR(-1),

+    cpuMSR(-1),

+    freqMSR(-1),

+    tempMSR(-1)

+{

+}

+

+bool

+IntelPowerGadget::Init()

+{

+    bool success = false;

+    const char *path = PR_GetEnv("IPG_Dir");

+    nsCString ipg_library;

+    if (path && *path) {

+        ipg_library.Append(path);

+        ipg_library.Append('/');

+        ipg_library.AppendLiteral(PG_LIBRARY_NAME);

+        libpowergadget = PR_LoadLibrary(ipg_library.get());

+    }

+

+    if(libpowergadget) {

+        Initialize = (IPGInitialize) PR_FindFunctionSymbol(libpowergadget, "IntelEnergyLibInitialize");

+        GetNumNodes = (IPGGetNumNodes) PR_FindFunctionSymbol(libpowergadget, "GetNumNodes");

+        GetMsrName = (IPGGetMsrName) PR_FindFunctionSymbol(libpowergadget, "GetMsrName");

+        GetMsrFunc = (IPGGetMsrFunc) PR_FindFunctionSymbol(libpowergadget, "GetMsrFunc");

+        ReadMSR = (IPGReadMSR) PR_FindFunctionSymbol(libpowergadget, "ReadMSR");

+        WriteMSR = (IPGWriteMSR) PR_FindFunctionSymbol(libpowergadget, "WriteMSR");

+        GetIAFrequency = (IPGGetIAFrequency) PR_FindFunctionSymbol(libpowergadget, "GetIAFrequency");

+        GetTDP = (IPGGetTDP) PR_FindFunctionSymbol(libpowergadget, "GetTDP");

+        GetMaxTemperature = (IPGGetMaxTemperature) PR_FindFunctionSymbol(libpowergadget, "GetMaxTemperature");

+        GetThresholds = (IPGGetThresholds) PR_FindFunctionSymbol(libpowergadget, "GetThresholds");

+        GetTemperature = (IPGGetTemperature) PR_FindFunctionSymbol(libpowergadget, "GetTemperature");

+        ReadSample = (IPGReadSample) PR_FindFunctionSymbol(libpowergadget, "ReadSample");

+        GetSysTime = (IPGGetSysTime) PR_FindFunctionSymbol(libpowergadget, "GetSysTime");

+        GetRDTSC = (IPGGetRDTSC) PR_FindFunctionSymbol(libpowergadget, "GetRDTSC");

+        GetTimeInterval = (IPGGetTimeInterval) PR_FindFunctionSymbol(libpowergadget, "GetTimeInterval");

+        GetBaseFrequency = (IPGGetBaseFrequency) PR_FindFunctionSymbol(libpowergadget, "GetBaseFrequency");

+        GetPowerData = (IPGGetPowerData) PR_FindFunctionSymbol(libpowergadget, "GetPowerData");

+        StartLog = (IPGStartLog) PR_FindFunctionSymbol(libpowergadget, "StartLog");

+        StopLog = (IPGStopLog) PR_FindFunctionSymbol(libpowergadget, "StopLog");

+        GetNumMsrs = (IPGGetNumMsrs) PR_FindFunctionSymbol(libpowergadget, "GetNumMsrs");

+    }

+

+    if(Initialize) {

+        Initialize();

+        int msrCount = GetNumberMsrs();

+        wchar_t name[1024] = {0};

+        for(int i = 0; i < msrCount; ++i) {

+            GetMsrName(i, name);

+            int func = 0;

+            GetMsrFunc(i, &func);

+            // MSR for frequency

+            if(wcscmp(name, L"CPU Frequency") == 0 && (func == 0)) {

+                this->freqMSR = i;

+            }

+            // MSR for Package

+            else if(wcscmp(name, L"Processor") == 0 && (func == 1)) {

+                this->packageMSR = i;

+            }

+            // MSR for CPU

+            else if(wcscmp(name, L"IA") == 0 && (func == 1)) {

+                this->cpuMSR = i;

+            }

+            // MSR for Temperature

+            else if(wcscmp(name, L"Package") == 0 && (func == 2)) {

+                this->tempMSR = i;

+            }

+        }

+        // Grab one sample at startup for a diff

+        TakeSample();

+        success = true;

+    }

+    return success;

+}

+

+IntelPowerGadget::~IntelPowerGadget()

+{

+    if(libpowergadget) {

+        NS_WARNING("Unloading PowerGadget library!\n");

+        PR_UnloadLibrary(libpowergadget);

+        libpowergadget = nullptr;

+        Initialize = nullptr;

+        GetNumNodes = nullptr;

+        GetMsrName = nullptr;

+        GetMsrFunc = nullptr;

+        ReadMSR = nullptr;

+        WriteMSR = nullptr;

+        GetIAFrequency = nullptr;

+        GetTDP = nullptr;

+        GetMaxTemperature = nullptr;

+        GetThresholds = nullptr;

+        GetTemperature = nullptr;

+        ReadSample = nullptr;

+        GetSysTime = nullptr;

+        GetRDTSC = nullptr;

+        GetTimeInterval = nullptr;

+        GetBaseFrequency = nullptr;

+        GetPowerData = nullptr;

+        StartLog = nullptr;

+        StopLog = nullptr;

+        GetNumMsrs = nullptr;

+    }

+}

+

+int

+IntelPowerGadget::GetNumberNodes()

+{

+    int nodes = 0;

+    if(GetNumNodes) {

+        int ok = GetNumNodes(&nodes);

+    }

+    return nodes;

+}

+

+int

+IntelPowerGadget::GetNumberMsrs()

+{

+    int msrs = 0;

+    if(GetNumMsrs) {

+        int ok = GetNumMsrs(&msrs);

+    }

+    return msrs;

+}

+

+int

+IntelPowerGadget::GetCPUFrequency(int node)

+{

+    int frequency = 0;

+    if(GetIAFrequency) {

+        int ok = GetIAFrequency(node, &frequency);

+    }

+    return frequency;

+}

+

+double

+IntelPowerGadget::GetTdp(int node)

+{

+    double tdp = 0.0;

+    if(GetTDP) {

+        int ok = GetTDP(node, &tdp);

+    }

+    return tdp;

+}

+

+int

+IntelPowerGadget::GetMaxTemp(int node)

+{

+    int maxTemperatureC = 0;

+    if(GetMaxTemperature) {

+        int ok = GetMaxTemperature(node, &maxTemperatureC);

+    }

+    return maxTemperatureC;

+}

+

+int

+IntelPowerGadget::GetTemp(int node)

+{

+    int temperatureC = 0;

+    if(GetTemperature) {

+        int ok = GetTemperature(node, &temperatureC);

+    }

+    return temperatureC;

+}

+

+int

+IntelPowerGadget::TakeSample()

+{

+    int ok = 0;

+    if(ReadSample) {

+        ok = ReadSample();

+    }

+    return ok;

+}

+

+uint64_t

+IntelPowerGadget::GetRdtsc()

+{

+    uint64_t rdtsc = 0;

+    if(GetRDTSC) {

+        int ok = GetRDTSC(&rdtsc);

+    }

+    return rdtsc;

+}

+

+double

+IntelPowerGadget::GetInterval()

+{

+    double interval = 0.0;

+    if(GetTimeInterval) {

+        int ok = GetTimeInterval(&interval);

+    }

+    return interval;

+}

+

+double

+IntelPowerGadget::GetCPUBaseFrequency(int node)

+{

+    double freq = 0.0;

+    if(GetBaseFrequency) {

+        int ok = GetBaseFrequency(node, &freq);

+    }

+    return freq;

+}

+

+double

+IntelPowerGadget::GetTotalPackagePowerInWatts()

+{

+    int nodes = GetNumberNodes();

+    double totalPower = 0.0;

+    for(int i = 0; i < nodes; ++i) {

+        totalPower += GetPackagePowerInWatts(i);

+    }

+    return totalPower;

+}

+

+double

+IntelPowerGadget::GetPackagePowerInWatts(int node)

+{

+    int numResult = 0;

+    double result[] = {0.0, 0.0, 0.0};

+    if(GetPowerData && packageMSR != -1) {

+        int ok = GetPowerData(node, packageMSR, result, &numResult);

+    }

+    return result[0];

+}

+

+double

+IntelPowerGadget::GetTotalCPUPowerInWatts()

+{

+    int nodes = GetNumberNodes();

+    double totalPower = 0.0;

+    for(int i = 0; i < nodes; ++i) {

+        totalPower += GetCPUPowerInWatts(i);

+    }

+    return totalPower;

+}

+

+double

+IntelPowerGadget::GetCPUPowerInWatts(int node)

+{

+    int numResult = 0;

+    double result[] = {0.0, 0.0, 0.0};

+    if(GetPowerData && cpuMSR != -1) {

+        int ok = GetPowerData(node, cpuMSR, result, &numResult);

+    }

+    return result[0];

+}

+

+double

+IntelPowerGadget::GetTotalGPUPowerInWatts()

+{

+    int nodes = GetNumberNodes();

+    double totalPower = 0.0;

+    for(int i = 0; i < nodes; ++i) {

+        totalPower += GetGPUPowerInWatts(i);

+    }

+    return totalPower;

+}

+

+double

+IntelPowerGadget::GetGPUPowerInWatts(int node)

+{

+    return 0.0;

+}

+

diff --git a/tools/profiler/core/IntelPowerGadget.h b/tools/profiler/core/IntelPowerGadget.h
new file mode 100644
index 000000000..4a24215b6
--- /dev/null
+++ b/tools/profiler/core/IntelPowerGadget.h
@@ -0,0 +1,150 @@
+/*
+ * Copyright 2013, Intel Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Author: Joe Olivas <joseph.k.olivas@intel.com>
+ */
+
+#ifndef profiler_IntelPowerGadget_h
+#define profiler_IntelPowerGadget_h
+
+#ifdef _MSC_VER
+typedef __int32 int32_t;
+typedef unsigned __int32 uint32_t;
+typedef __int64 int64_t;
+typedef unsigned __int64 uint64_t;
+#else
+#include <stdint.h>
+#endif
+#include "prlink.h"
+
+typedef int (*IPGInitialize) ();
+typedef int (*IPGGetNumNodes) (int *nNodes);
+typedef int (*IPGGetNumMsrs) (int *nMsr);
+typedef int (*IPGGetMsrName) (int iMsr, wchar_t *szName);
+typedef int (*IPGGetMsrFunc) (int iMsr, int *pFuncID);
+typedef int (*IPGReadMSR) (int iNode, unsigned int address, uint64_t *value);
+typedef int (*IPGWriteMSR) (int iNode, unsigned int address, uint64_t value);
+typedef int (*IPGGetIAFrequency) (int iNode, int *freqInMHz);
+typedef int (*IPGGetTDP) (int iNode, double *TDP);
+typedef int (*IPGGetMaxTemperature) (int iNode, int *degreeC);
+typedef int (*IPGGetThresholds) (int iNode, int *degree1C, int *degree2C);
+typedef int (*IPGGetTemperature) (int iNode, int *degreeC);
+typedef int (*IPGReadSample) ();
+typedef int (*IPGGetSysTime) (void *pSysTime);
+typedef int (*IPGGetRDTSC) (uint64_t *pTSC);
+typedef int (*IPGGetTimeInterval) (double *pOffset);
+typedef int (*IPGGetBaseFrequency) (int iNode, double *pBaseFrequency);
+typedef int (*IPGGetPowerData) (int iNode, int iMSR, double *pResult, int *nResult);
+typedef int (*IPGStartLog) (wchar_t *szFileName);
+typedef int (*IPGStopLog) ();
+
+#if defined(__x86_64__) || defined(__x86_64) || defined(_M_AMD64)
+#define PG_LIBRARY_NAME "EnergyLib64"
+#else
+#define PG_LIBRARY_NAME "EnergyLib32"
+#endif
+
+
+class IntelPowerGadget
+{
+public:
+
+    IntelPowerGadget();
+    ~IntelPowerGadget();
+
+    // Fails if initialization is incomplete
+    bool Init();
+
+    // Returns the number of packages on the system
+    int GetNumberNodes();
+
+    // Returns the number of MSRs being tracked
+    int GetNumberMsrs();
+
+    // Given a node, returns the temperature
+    int GetCPUFrequency(int);
+
+    // Returns the TDP of the given node
+    double GetTdp(int);
+
+    // Returns the maximum temperature for the given node
+    int GetMaxTemp(int);
+
+    // Returns the current temperature in degrees C
+    // of the given node
+    int GetTemp(int);
+
+    // Takes a sample of data. Must be called before
+    // any current data is retrieved.
+    int TakeSample();
+
+    // Gets the timestamp of the most recent sample
+    uint64_t GetRdtsc();
+
+    // returns number of seconds between the last
+    // two samples
+    double GetInterval();
+
+    // Returns the base frequency for the given node
+    double GetCPUBaseFrequency(int node);
+
+    // Returns the combined package power for all
+    // packages on the system for the last sample.
+    double GetTotalPackagePowerInWatts();
+    double GetPackagePowerInWatts(int node);
+
+    // Returns the combined CPU power for all
+    // packages on the system for the last sample.
+    // If the reading is not available, returns 0.0
+    double GetTotalCPUPowerInWatts();
+    double GetCPUPowerInWatts(int node);
+
+    // Returns the combined GPU power for all
+    // packages on the system for the last sample.
+    // If the reading is not available, returns 0.0
+    double GetTotalGPUPowerInWatts();
+    double GetGPUPowerInWatts(int node);
+
+private:
+
+    PRLibrary *libpowergadget;
+    IPGInitialize Initialize;
+    IPGGetNumNodes GetNumNodes;
+    IPGGetNumMsrs GetNumMsrs;
+    IPGGetMsrName GetMsrName;
+    IPGGetMsrFunc GetMsrFunc;
+    IPGReadMSR ReadMSR;
+    IPGWriteMSR WriteMSR;
+    IPGGetIAFrequency GetIAFrequency;
+    IPGGetTDP GetTDP;
+    IPGGetMaxTemperature GetMaxTemperature;
+    IPGGetThresholds GetThresholds;
+    IPGGetTemperature GetTemperature;
+    IPGReadSample ReadSample;
+    IPGGetSysTime GetSysTime;
+    IPGGetRDTSC GetRDTSC;
+    IPGGetTimeInterval GetTimeInterval;
+    IPGGetBaseFrequency GetBaseFrequency;
+    IPGGetPowerData GetPowerData;
+    IPGStartLog StartLog;
+    IPGStopLog StopLog;
+
+    int packageMSR;
+    int cpuMSR;
+    int freqMSR;
+    int tempMSR;
+};
+
+#endif // profiler_IntelPowerGadget_h
diff --git a/tools/profiler/core/PlatformMacros.h b/tools/profiler/core/PlatformMacros.h
new file mode 100644
index 000000000..9a544a42e
--- /dev/null
+++ b/tools/profiler/core/PlatformMacros.h
@@ -0,0 +1,76 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef SPS_PLATFORM_MACROS_H
+#define SPS_PLATFORM_MACROS_H
+
+/* Define platform selection macros in a consistent way.  Don't add
+   anything else to this file, so it can remain freestanding.  The
+   primary factorisation is on (ARCH,OS) pairs ("PLATforms") but ARCH_
+   and OS_ macros are defined too, since they are sometimes
+   convenient. */
+
+#undef SPS_PLAT_arm_android
+#undef SPS_PLAT_amd64_linux
+#undef SPS_PLAT_x86_linux
+#undef SPS_PLAT_amd64_darwin
+#undef SPS_PLAT_x86_darwin
+#undef SPS_PLAT_x86_windows
+#undef SPS_PLAT_amd64_windows
+
+#undef SPS_ARCH_arm
+#undef SPS_ARCH_x86
+#undef SPS_ARCH_amd64
+
+#undef SPS_OS_android
+#undef SPS_OS_linux
+#undef SPS_OS_darwin
+#undef SPS_OS_windows
+
+#if defined(__linux__) && defined(__x86_64__)
+#  define SPS_PLAT_amd64_linux 1
+#  define SPS_ARCH_amd64 1
+#  define SPS_OS_linux 1
+
+#elif defined(__ANDROID__) && defined(__arm__)
+#  define SPS_PLAT_arm_android 1
+#  define SPS_ARCH_arm 1
+#  define SPS_OS_android 1
+
+#elif defined(__ANDROID__) && defined(__i386__)
+#  define SPS_PLAT_x86_android 1
+#  define SPS_ARCH_x86 1
+#  define SPS_OS_android 1
+
+#elif defined(__linux__) && defined(__i386__)
+#  define SPS_PLAT_x86_linux 1
+#  define SPS_ARCH_x86 1
+#  define SPS_OS_linux 1
+
+#elif defined(__APPLE__) && defined(__x86_64__)
+#  define SPS_PLAT_amd64_darwin 1
+#  define SPS_ARCH_amd64 1
+#  define SPS_OS_darwin 1
+
+#elif defined(__APPLE__) && defined(__i386__)
+#  define SPS_PLAT_x86_darwin 1
+#  define SPS_ARCH_x86 1
+#  define SPS_OS_darwin 1
+
+#elif (defined(_MSC_VER) || defined(__MINGW32__)) && (defined(_M_IX86) || defined(__i386__))
+#  define SPS_PLAT_x86_windows 1
+#  define SPS_ARCH_x86 1
+#  define SPS_OS_windows 1
+
+#elif (defined(_MSC_VER) || defined(__MINGW32__)) && (defined(_M_X64) || defined(__x86_64__))
+#  define SPS_PLAT_amd64_windows 1
+#  define SPS_ARCH_amd64 1
+#  define SPS_OS_windows 1
+
+#else
+#  error "Unsupported platform"
+#endif
+
+#endif /* ndef SPS_PLATFORM_MACROS_H */
diff --git a/tools/profiler/core/ProfileBuffer.cpp b/tools/profiler/core/ProfileBuffer.cpp
new file mode 100644
index 000000000..a4b91d8fc
--- /dev/null
+++ b/tools/profiler/core/ProfileBuffer.cpp
@@ -0,0 +1,89 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ProfileBuffer.h"
+
+ProfileBuffer::ProfileBuffer(int aEntrySize)
+  : mEntries(MakeUnique<ProfileEntry[]>(aEntrySize))
+  , mWritePos(0)
+  , mReadPos(0)
+  , mEntrySize(aEntrySize)
+  , mGeneration(0)
+{
+}
+
+ProfileBuffer::~ProfileBuffer()
+{
+  while (mStoredMarkers.peek()) {
+    delete mStoredMarkers.popHead();
+  }
+}
+
+// Called from signal, call only reentrant functions
+void ProfileBuffer::addTag(const ProfileEntry& aTag)
+{
+  mEntries[mWritePos++] = aTag;
+  if (mWritePos == mEntrySize) {
+    // Wrapping around may result in things referenced in the buffer (e.g.,
+    // JIT code addresses and markers) being incorrectly collected.
+    MOZ_ASSERT(mGeneration != UINT32_MAX);
+    mGeneration++;
+    mWritePos = 0;
+  }
+  if (mWritePos == mReadPos) {
+    // Keep one slot open.
+    mEntries[mReadPos] = ProfileEntry();
+    mReadPos = (mReadPos + 1) % mEntrySize;
+  }
+}
+
+void ProfileBuffer::addStoredMarker(ProfilerMarker *aStoredMarker) {
+  aStoredMarker->SetGeneration(mGeneration);
+  mStoredMarkers.insert(aStoredMarker);
+}
+
+void ProfileBuffer::deleteExpiredStoredMarkers() {
+  // Delete markers of samples that have been overwritten due to circular
+  // buffer wraparound.
+  uint32_t generation = mGeneration;
+  while (mStoredMarkers.peek() &&
+         mStoredMarkers.peek()->HasExpired(generation)) {
+    delete mStoredMarkers.popHead();
+  }
+}
+
+void ProfileBuffer::reset() {
+  mGeneration += 2;
+  mReadPos = mWritePos = 0;
+}
+
+#define DYNAMIC_MAX_STRING 8192
+
+char* ProfileBuffer::processDynamicTag(int readPos,
+                                       int* tagsConsumed, char* tagBuff)
+{
+  int readAheadPos = (readPos + 1) % mEntrySize;
+  int tagBuffPos = 0;
+
+  // Read the string stored in mTagData until the null character is seen
+  bool seenNullByte = false;
+  while (readAheadPos != mWritePos && !seenNullByte) {
+    (*tagsConsumed)++;
+    ProfileEntry readAheadEntry = mEntries[readAheadPos];
+    for (size_t pos = 0; pos < sizeof(void*); pos++) {
+      tagBuff[tagBuffPos] = readAheadEntry.mTagChars[pos];
+      if (tagBuff[tagBuffPos] == '\0' || tagBuffPos == DYNAMIC_MAX_STRING-2) {
+        seenNullByte = true;
+        break;
+      }
+      tagBuffPos++;
+    }
+    if (!seenNullByte)
+      readAheadPos = (readAheadPos + 1) % mEntrySize;
+  }
+  return tagBuff;
+}
+
+
diff --git a/tools/profiler/core/ProfileBuffer.h b/tools/profiler/core/ProfileBuffer.h
new file mode 100644
index 000000000..7d90fe385
--- /dev/null
+++ b/tools/profiler/core/ProfileBuffer.h
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MOZ_PROFILE_BUFFER_H
+#define MOZ_PROFILE_BUFFER_H
+
+#include "ProfileEntry.h"
+#include "platform.h"
+#include "ProfileJSONWriter.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/RefCounted.h"
+
+class ProfileBuffer : public mozilla::RefCounted<ProfileBuffer> {
+public:
+  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(ProfileBuffer)
+
+  explicit ProfileBuffer(int aEntrySize);
+
+  virtual ~ProfileBuffer();
+
+  void addTag(const ProfileEntry& aTag);
+  void StreamSamplesToJSON(SpliceableJSONWriter& aWriter, int aThreadId, double aSinceTime,
+                           JSContext* cx, UniqueStacks& aUniqueStacks);
+  void StreamMarkersToJSON(SpliceableJSONWriter& aWriter, int aThreadId, double aSinceTime,
+                           UniqueStacks& aUniqueStacks);
+  void DuplicateLastSample(int aThreadId);
+
+  void addStoredMarker(ProfilerMarker* aStoredMarker);
+
+  // The following two methods are not signal safe! They delete markers.
+  void deleteExpiredStoredMarkers();
+  void reset();
+
+protected:
+  char* processDynamicTag(int readPos, int* tagsConsumed, char* tagBuff);
+  int FindLastSampleOfThread(int aThreadId);
+
+public:
+  // Circular buffer 'Keep One Slot Open' implementation for simplicity
+  mozilla::UniquePtr<ProfileEntry[]> mEntries;
+
+  // Points to the next entry we will write to, which is also the one at which
+  // we need to stop reading.
+  int mWritePos;
+
+  // Points to the entry at which we can start reading.
+  int mReadPos;
+
+  // The number of entries in our buffer.
+  int mEntrySize;
+
+  // How many times mWritePos has wrapped around.
+  uint32_t mGeneration;
+
+  // Markers that marker entries in the buffer might refer to.
+  ProfilerMarkerLinkedList mStoredMarkers;
+};
+
+#endif
diff --git a/tools/profiler/core/ProfileEntry.cpp b/tools/profiler/core/ProfileEntry.cpp
new file mode 100644
index 000000000..22d53a6f3
--- /dev/null
+++ b/tools/profiler/core/ProfileEntry.cpp
@@ -0,0 +1,881 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <ostream>
+#include "platform.h"
+#include "mozilla/HashFunctions.h"
+
+#ifndef SPS_STANDALONE
+#include "nsThreadUtils.h"
+#include "nsXULAppAPI.h"
+
+// JS
+#include "jsapi.h"
+#include "jsfriendapi.h"
+#include "js/TrackedOptimizationInfo.h"
+#endif
+
+// Self
+#include "ProfileEntry.h"
+
+using mozilla::MakeUnique;
+using mozilla::UniquePtr;
+using mozilla::Maybe;
+using mozilla::Some;
+using mozilla::Nothing;
+using mozilla::JSONWriter;
+
+
+////////////////////////////////////////////////////////////////////////
+// BEGIN ProfileEntry
+
+ProfileEntry::ProfileEntry()
+  : mTagData(nullptr)
+  , mTagName(0)
+{ }
+
+// aTagData must not need release (i.e. be a string from the text segment)
+ProfileEntry::ProfileEntry(char aTagName, const char *aTagData)
+  : mTagData(aTagData)
+  , mTagName(aTagName)
+{ }
+
+ProfileEntry::ProfileEntry(char aTagName, ProfilerMarker *aTagMarker)
+  : mTagMarker(aTagMarker)
+  , mTagName(aTagName)
+{ }
+
+ProfileEntry::ProfileEntry(char aTagName, void *aTagPtr)
+  : mTagPtr(aTagPtr)
+  , mTagName(aTagName)
+{ }
+
+ProfileEntry::ProfileEntry(char aTagName, double aTagDouble)
+  : mTagDouble(aTagDouble)
+  , mTagName(aTagName)
+{ }
+
+ProfileEntry::ProfileEntry(char aTagName, uintptr_t aTagOffset)
+  : mTagOffset(aTagOffset)
+  , mTagName(aTagName)
+{ }
+
+ProfileEntry::ProfileEntry(char aTagName, Address aTagAddress)
+  : mTagAddress(aTagAddress)
+  , mTagName(aTagName)
+{ }
+
+ProfileEntry::ProfileEntry(char aTagName, int aTagInt)
+  : mTagInt(aTagInt)
+  , mTagName(aTagName)
+{ }
+
+ProfileEntry::ProfileEntry(char aTagName, char aTagChar)
+  : mTagChar(aTagChar)
+  , mTagName(aTagName)
+{ }
+
+bool ProfileEntry::is_ent_hint(char hintChar) {
+  return mTagName == 'h' && mTagChar == hintChar;
+}
+
+bool ProfileEntry::is_ent_hint() {
+  return mTagName == 'h';
+}
+
+bool ProfileEntry::is_ent(char tagChar) {
+  return mTagName == tagChar;
+}
+
+void* ProfileEntry::get_tagPtr() {
+  // No consistency checking.  Oh well.
+  return mTagPtr;
+}
+
+// END ProfileEntry
+////////////////////////////////////////////////////////////////////////
+
+class JSONSchemaWriter
+{
+  JSONWriter& mWriter;
+  uint32_t mIndex;
+
+public:
+  explicit JSONSchemaWriter(JSONWriter& aWriter)
+   : mWriter(aWriter)
+   , mIndex(0)
+  {
+    aWriter.StartObjectProperty("schema");
+  }
+
+  void WriteField(const char* aName) {
+    mWriter.IntProperty(aName, mIndex++);
+  }
+
+  ~JSONSchemaWriter() {
+    mWriter.EndObject();
+  }
+};
+
+#ifndef SPS_STANDALONE
+class StreamOptimizationTypeInfoOp : public JS::ForEachTrackedOptimizationTypeInfoOp
+{
+  JSONWriter& mWriter;
+  UniqueJSONStrings& mUniqueStrings;
+  bool mStartedTypeList;
+
+public:
+  StreamOptimizationTypeInfoOp(JSONWriter& aWriter, UniqueJSONStrings& aUniqueStrings)
+    : mWriter(aWriter)
+    , mUniqueStrings(aUniqueStrings)
+    , mStartedTypeList(false)
+  { }
+
+  void readType(const char* keyedBy, const char* name,
+                const char* location, Maybe<unsigned> lineno) override {
+    if (!mStartedTypeList) {
+      mStartedTypeList = true;
+      mWriter.StartObjectElement();
+      mWriter.StartArrayProperty("typeset");
+    }
+
+    mWriter.StartObjectElement();
+    {
+      mUniqueStrings.WriteProperty(mWriter, "keyedBy", keyedBy);
+      if (name) {
+        mUniqueStrings.WriteProperty(mWriter, "name", name);
+      }
+      if (location) {
+        mUniqueStrings.WriteProperty(mWriter, "location", location);
+      }
+      if (lineno.isSome()) {
+        mWriter.IntProperty("line", *lineno);
+      }
+    }
+    mWriter.EndObject();
+  }
+
+  void operator()(JS::TrackedTypeSite site, const char* mirType) override {
+    if (mStartedTypeList) {
+      mWriter.EndArray();
+      mStartedTypeList = false;
+    } else {
+      mWriter.StartObjectElement();
+    }
+
+    {
+      mUniqueStrings.WriteProperty(mWriter, "site", JS::TrackedTypeSiteString(site));
+      mUniqueStrings.WriteProperty(mWriter, "mirType", mirType);
+    }
+    mWriter.EndObject();
+  }
+};
+
+// As mentioned in ProfileEntry.h, the JSON format contains many arrays whose
+// elements are laid out according to various schemas to help
+// de-duplication. This RAII class helps write these arrays by keeping track of
+// the last non-null element written and adding the appropriate number of null
+// elements when writing new non-null elements. It also automatically opens and
+// closes an array element on the given JSON writer.
+//
+// Example usage:
+//
+//     // Define the schema of elements in this type of array: [FOO, BAR, BAZ]
+//     enum Schema : uint32_t {
+//       FOO = 0,
+//       BAR = 1,
+//       BAZ = 2
+//     };
+//
+//     AutoArraySchemaWriter writer(someJsonWriter, someUniqueStrings);
+//     if (shouldWriteFoo) {
+//       writer.IntElement(FOO, getFoo());
+//     }
+//     ... etc ...
+class MOZ_RAII AutoArraySchemaWriter
+{
+  friend class AutoObjectWriter;
+
+  SpliceableJSONWriter& mJSONWriter;
+  UniqueJSONStrings*    mStrings;
+  uint32_t              mNextFreeIndex;
+
+public:
+  AutoArraySchemaWriter(SpliceableJSONWriter& aWriter, UniqueJSONStrings& aStrings)
+    : mJSONWriter(aWriter)
+    , mStrings(&aStrings)
+    , mNextFreeIndex(0)
+  {
+    mJSONWriter.StartArrayElement();
+  }
+
+  // If you don't have access to a UniqueStrings, you had better not try and
+  // write a string element down the line!
+  explicit AutoArraySchemaWriter(SpliceableJSONWriter& aWriter)
+    : mJSONWriter(aWriter)
+    , mStrings(nullptr)
+    , mNextFreeIndex(0)
+  {
+    mJSONWriter.StartArrayElement();
+  }
+
+  ~AutoArraySchemaWriter() {
+    mJSONWriter.EndArray();
+  }
+
+  void FillUpTo(uint32_t aIndex) {
+    MOZ_ASSERT(aIndex >= mNextFreeIndex);
+    mJSONWriter.NullElements(aIndex - mNextFreeIndex);
+    mNextFreeIndex = aIndex + 1;
+  }
+
+  void IntElement(uint32_t aIndex, uint32_t aValue) {
+    FillUpTo(aIndex);
+    mJSONWriter.IntElement(aValue);
+  }
+
+  void DoubleElement(uint32_t aIndex, double aValue) {
+    FillUpTo(aIndex);
+    mJSONWriter.DoubleElement(aValue);
+  }
+
+  void StringElement(uint32_t aIndex, const char* aValue) {
+    MOZ_RELEASE_ASSERT(mStrings);
+    FillUpTo(aIndex);
+    mStrings->WriteElement(mJSONWriter, aValue);
+  }
+};
+
+class StreamOptimizationAttemptsOp : public JS::ForEachTrackedOptimizationAttemptOp
+{
+  SpliceableJSONWriter& mWriter;
+  UniqueJSONStrings& mUniqueStrings;
+
+public:
+  StreamOptimizationAttemptsOp(SpliceableJSONWriter& aWriter, UniqueJSONStrings& aUniqueStrings)
+    : mWriter(aWriter),
+      mUniqueStrings(aUniqueStrings)
+  { }
+
+  void operator()(JS::TrackedStrategy strategy, JS::TrackedOutcome outcome) override {
+    enum Schema : uint32_t {
+      STRATEGY = 0,
+      OUTCOME = 1
+    };
+
+    AutoArraySchemaWriter writer(mWriter, mUniqueStrings);
+    writer.StringElement(STRATEGY, JS::TrackedStrategyString(strategy));
+    writer.StringElement(OUTCOME, JS::TrackedOutcomeString(outcome));
+  }
+};
+
+class StreamJSFramesOp : public JS::ForEachProfiledFrameOp
+{
+  void* mReturnAddress;
+  UniqueStacks::Stack& mStack;
+  unsigned mDepth;
+
+public:
+  StreamJSFramesOp(void* aReturnAddr, UniqueStacks::Stack& aStack)
+   : mReturnAddress(aReturnAddr)
+   , mStack(aStack)
+   , mDepth(0)
+  { }
+
+  unsigned depth() const {
+    MOZ_ASSERT(mDepth > 0);
+    return mDepth;
+  }
+
+  void operator()(const JS::ForEachProfiledFrameOp::FrameHandle& aFrameHandle) override {
+    UniqueStacks::OnStackFrameKey frameKey(mReturnAddress, mDepth, aFrameHandle);
+    mStack.AppendFrame(frameKey);
+    mDepth++;
+  }
+};
+#endif
+
+uint32_t UniqueJSONStrings::GetOrAddIndex(const char* aStr)
+{
+  uint32_t index;
+  StringKey key(aStr);
+
+  auto it = mStringToIndexMap.find(key);
+
+  if (it != mStringToIndexMap.end()) {
+    return it->second;
+  }
+  index = mStringToIndexMap.size();
+  mStringToIndexMap[key] = index;
+  mStringTableWriter.StringElement(aStr);
+  return index;
+}
+
+bool UniqueStacks::FrameKey::operator==(const FrameKey& aOther) const
+{
+  return mLocation == aOther.mLocation &&
+         mLine == aOther.mLine &&
+         mCategory == aOther.mCategory &&
+         mJITAddress == aOther.mJITAddress &&
+         mJITDepth == aOther.mJITDepth;
+}
+
+bool UniqueStacks::StackKey::operator==(const StackKey& aOther) const
+{
+  MOZ_ASSERT_IF(mPrefix == aOther.mPrefix, mPrefixHash == aOther.mPrefixHash);
+  return mPrefix == aOther.mPrefix && mFrame == aOther.mFrame;
+}
+
+UniqueStacks::Stack::Stack(UniqueStacks& aUniqueStacks, const OnStackFrameKey& aRoot)
+ : mUniqueStacks(aUniqueStacks)
+ , mStack(aUniqueStacks.GetOrAddFrameIndex(aRoot))
+{
+}
+
+void UniqueStacks::Stack::AppendFrame(const OnStackFrameKey& aFrame)
+{
+  // Compute the prefix hash and index before mutating mStack.
+  uint32_t prefixHash = mStack.Hash();
+  uint32_t prefix = mUniqueStacks.GetOrAddStackIndex(mStack);
+  mStack.UpdateHash(prefixHash, prefix, mUniqueStacks.GetOrAddFrameIndex(aFrame));
+}
+
+uint32_t UniqueStacks::Stack::GetOrAddIndex() const
+{
+  return mUniqueStacks.GetOrAddStackIndex(mStack);
+}
+
+uint32_t UniqueStacks::FrameKey::Hash() const
+{
+  uint32_t hash = 0;
+  if (!mLocation.IsEmpty()) {
+#ifdef SPS_STANDALONE
+    hash = mozilla::HashString(mLocation.c_str());
+#else
+    hash = mozilla::HashString(mLocation.get());
+#endif
+  }
+  if (mLine.isSome()) {
+    hash = mozilla::AddToHash(hash, *mLine);
+  }
+  if (mCategory.isSome()) {
+    hash = mozilla::AddToHash(hash, *mCategory);
+  }
+  if (mJITAddress.isSome()) {
+    hash = mozilla::AddToHash(hash, *mJITAddress);
+    if (mJITDepth.isSome()) {
+      hash = mozilla::AddToHash(hash, *mJITDepth);
+    }
+  }
+  return hash;
+}
+
+uint32_t UniqueStacks::StackKey::Hash() const
+{
+  if (mPrefix.isNothing()) {
+    return mozilla::HashGeneric(mFrame);
+  }
+  return mozilla::AddToHash(*mPrefixHash, mFrame);
+}
+
+UniqueStacks::Stack UniqueStacks::BeginStack(const OnStackFrameKey& aRoot)
+{
+  return Stack(*this, aRoot);
+}
+
+UniqueStacks::UniqueStacks(JSContext* aContext)
+ : mContext(aContext)
+ , mFrameCount(0)
+{
+  mFrameTableWriter.StartBareList();
+  mStackTableWriter.StartBareList();
+}
+
+#ifdef SPS_STANDALONE
+uint32_t UniqueStacks::GetOrAddStackIndex(const StackKey& aStack)
+{
+  uint32_t index;
+  auto it = mStackToIndexMap.find(aStack);
+
+  if (it != mStackToIndexMap.end()) {
+    return it->second;
+  }
+
+  index = mStackToIndexMap.size();
+  mStackToIndexMap[aStack] = index;
+  StreamStack(aStack);
+  return index;
+}
+#else
+uint32_t UniqueStacks::GetOrAddStackIndex(const StackKey& aStack)
+{
+  uint32_t index;
+  if (mStackToIndexMap.Get(aStack, &index)) {
+    MOZ_ASSERT(index < mStackToIndexMap.Count());
+    return index;
+  }
+
+  index = mStackToIndexMap.Count();
+  mStackToIndexMap.Put(aStack, index);
+  StreamStack(aStack);
+  return index;
+}
+#endif
+
+#ifdef SPS_STANDALONE
+uint32_t UniqueStacks::GetOrAddFrameIndex(const OnStackFrameKey& aFrame)
+{
+  uint32_t index;
+  auto it = mFrameToIndexMap.find(aFrame);
+  if (it != mFrameToIndexMap.end()) {
+    MOZ_ASSERT(it->second < mFrameCount);
+    return it->second;
+  }
+
+  // A manual count is used instead of mFrameToIndexMap.Count() due to
+  // forwarding of canonical JIT frames above.
+  index = mFrameCount++;
+  mFrameToIndexMap[aFrame] = index;
+  StreamFrame(aFrame);
+  return index;
+}
+#else
+uint32_t UniqueStacks::GetOrAddFrameIndex(const OnStackFrameKey& aFrame)
+{
+  uint32_t index;
+  if (mFrameToIndexMap.Get(aFrame, &index)) {
+    MOZ_ASSERT(index < mFrameCount);
+    return index;
+  }
+
+  // If aFrame isn't canonical, forward it to the canonical frame's index.
+  if (aFrame.mJITFrameHandle) {
+    void* canonicalAddr = aFrame.mJITFrameHandle->canonicalAddress();
+    if (canonicalAddr != *aFrame.mJITAddress) {
+      OnStackFrameKey canonicalKey(canonicalAddr, *aFrame.mJITDepth, *aFrame.mJITFrameHandle);
+      uint32_t canonicalIndex = GetOrAddFrameIndex(canonicalKey);
+      mFrameToIndexMap.Put(aFrame, canonicalIndex);
+      return canonicalIndex;
+    }
+  }
+
+  // A manual count is used instead of mFrameToIndexMap.Count() due to
+  // forwarding of canonical JIT frames above.
+  index = mFrameCount++;
+  mFrameToIndexMap.Put(aFrame, index);
+  StreamFrame(aFrame);
+  return index;
+}
+#endif
+
+uint32_t UniqueStacks::LookupJITFrameDepth(void* aAddr)
+{
+  uint32_t depth;
+
+  auto it = mJITFrameDepthMap.find(aAddr);
+  if (it != mJITFrameDepthMap.end()) {
+    depth = it->second;
+    MOZ_ASSERT(depth > 0);
+    return depth;
+  }
+  return 0;
+}
+
+void UniqueStacks::AddJITFrameDepth(void* aAddr, unsigned depth)
+{
+  mJITFrameDepthMap[aAddr] = depth;
+}
+
+void UniqueStacks::SpliceFrameTableElements(SpliceableJSONWriter& aWriter)
+{
+  mFrameTableWriter.EndBareList();
+  aWriter.TakeAndSplice(mFrameTableWriter.WriteFunc());
+}
+
+void UniqueStacks::SpliceStackTableElements(SpliceableJSONWriter& aWriter)
+{
+  mStackTableWriter.EndBareList();
+  aWriter.TakeAndSplice(mStackTableWriter.WriteFunc());
+}
+
+void UniqueStacks::StreamStack(const StackKey& aStack)
+{
+  enum Schema : uint32_t {
+    PREFIX = 0,
+    FRAME = 1
+  };
+
+  AutoArraySchemaWriter writer(mStackTableWriter, mUniqueStrings);
+  if (aStack.mPrefix.isSome()) {
+    writer.IntElement(PREFIX, *aStack.mPrefix);
+  }
+  writer.IntElement(FRAME, aStack.mFrame);
+}
+
+void UniqueStacks::StreamFrame(const OnStackFrameKey& aFrame)
+{
+  enum Schema : uint32_t {
+    LOCATION = 0,
+    IMPLEMENTATION = 1,
+    OPTIMIZATIONS = 2,
+    LINE = 3,
+    CATEGORY = 4
+  };
+
+  AutoArraySchemaWriter writer(mFrameTableWriter, mUniqueStrings);
+
+#ifndef SPS_STANDALONE
+  if (!aFrame.mJITFrameHandle) {
+#else
+  {
+#endif
+#ifdef SPS_STANDALONE
+    writer.StringElement(LOCATION, aFrame.mLocation.c_str());
+#else
+    writer.StringElement(LOCATION, aFrame.mLocation.get());
+#endif
+    if (aFrame.mLine.isSome()) {
+      writer.IntElement(LINE, *aFrame.mLine);
+    }
+    if (aFrame.mCategory.isSome()) {
+      writer.IntElement(CATEGORY, *aFrame.mCategory);
+    }
+  }
+#ifndef SPS_STANDALONE
+  else {
+    const JS::ForEachProfiledFrameOp::FrameHandle& jitFrame = *aFrame.mJITFrameHandle;
+
+    writer.StringElement(LOCATION, jitFrame.label());
+
+    JS::ProfilingFrameIterator::FrameKind frameKind = jitFrame.frameKind();
+    MOZ_ASSERT(frameKind == JS::ProfilingFrameIterator::Frame_Ion ||
+               frameKind == JS::ProfilingFrameIterator::Frame_Baseline);
+    writer.StringElement(IMPLEMENTATION,
+                         frameKind == JS::ProfilingFrameIterator::Frame_Ion
+                         ? "ion"
+                         : "baseline");
+
+    if (jitFrame.hasTrackedOptimizations()) {
+      writer.FillUpTo(OPTIMIZATIONS);
+      mFrameTableWriter.StartObjectElement();
+      {
+        mFrameTableWriter.StartArrayProperty("types");
+        {
+          StreamOptimizationTypeInfoOp typeInfoOp(mFrameTableWriter, mUniqueStrings);
+          jitFrame.forEachOptimizationTypeInfo(typeInfoOp);
+        }
+        mFrameTableWriter.EndArray();
+
+        JS::Rooted<JSScript*> script(mContext);
+        jsbytecode* pc;
+        mFrameTableWriter.StartObjectProperty("attempts");
+        {
+          {
+            JSONSchemaWriter schema(mFrameTableWriter);
+            schema.WriteField("strategy");
+            schema.WriteField("outcome");
+          }
+
+          mFrameTableWriter.StartArrayProperty("data");
+          {
+            StreamOptimizationAttemptsOp attemptOp(mFrameTableWriter, mUniqueStrings);
+            jitFrame.forEachOptimizationAttempt(attemptOp, script.address(), &pc);
+          }
+          mFrameTableWriter.EndArray();
+        }
+        mFrameTableWriter.EndObject();
+
+        if (JSAtom* name = js::GetPropertyNameFromPC(script, pc)) {
+          char buf[512];
+          JS_PutEscapedFlatString(buf, mozilla::ArrayLength(buf), js::AtomToFlatString(name), 0);
+          mUniqueStrings.WriteProperty(mFrameTableWriter, "propertyName", buf);
+        }
+
+        unsigned line, column;
+        line = JS_PCToLineNumber(script, pc, &column);
+        mFrameTableWriter.IntProperty("line", line);
+        mFrameTableWriter.IntProperty("column", column);
+      }
+      mFrameTableWriter.EndObject();
+    }
+  }
+#endif
+}
+
+struct ProfileSample
+{
+  uint32_t mStack;
+  Maybe<double> mTime;
+  Maybe<double> mResponsiveness;
+  Maybe<double> mRSS;
+  Maybe<double> mUSS;
+  Maybe<int> mFrameNumber;
+  Maybe<double> mPower;
+};
+
+static void WriteSample(SpliceableJSONWriter& aWriter, ProfileSample& aSample)
+{
+  enum Schema : uint32_t {
+    STACK = 0,
+    TIME = 1,
+    RESPONSIVENESS = 2,
+    RSS = 3,
+    USS = 4,
+    FRAME_NUMBER = 5,
+    POWER = 6
+  };
+
+  AutoArraySchemaWriter writer(aWriter);
+
+  writer.IntElement(STACK, aSample.mStack);
+
+  if (aSample.mTime.isSome()) {
+    writer.DoubleElement(TIME, *aSample.mTime);
+  }
+
+  if (aSample.mResponsiveness.isSome()) {
+    writer.DoubleElement(RESPONSIVENESS, *aSample.mResponsiveness);
+  }
+
+  if (aSample.mRSS.isSome()) {
+    writer.DoubleElement(RSS, *aSample.mRSS);
+  }
+
+  if (aSample.mUSS.isSome()) {
+    writer.DoubleElement(USS, *aSample.mUSS);
+  }
+
+  if (aSample.mFrameNumber.isSome()) {
+    writer.IntElement(FRAME_NUMBER, *aSample.mFrameNumber);
+  }
+
+  if (aSample.mPower.isSome()) {
+    writer.DoubleElement(POWER, *aSample.mPower);
+  }
+}
+
+void ProfileBuffer::StreamSamplesToJSON(SpliceableJSONWriter& aWriter, int aThreadId,
+                                        double aSinceTime, JSContext* aContext,
+                                        UniqueStacks& aUniqueStacks)
+{
+  Maybe<ProfileSample> sample;
+  int readPos = mReadPos;
+  int currentThreadID = -1;
+  Maybe<double> currentTime;
+  UniquePtr<char[]> tagBuff = MakeUnique<char[]>(DYNAMIC_MAX_STRING);
+
+  while (readPos != mWritePos) {
+    ProfileEntry entry = mEntries[readPos];
+    if (entry.mTagName == 'T') {
+      currentThreadID = entry.mTagInt;
+      currentTime.reset();
+      int readAheadPos = (readPos + 1) % mEntrySize;
+      if (readAheadPos != mWritePos) {
+        ProfileEntry readAheadEntry = mEntries[readAheadPos];
+        if (readAheadEntry.mTagName == 't') {
+          currentTime = Some(readAheadEntry.mTagDouble);
+        }
+      }
+    }
+    if (currentThreadID == aThreadId && (currentTime.isNothing() || *currentTime >= aSinceTime)) {
+      switch (entry.mTagName) {
+      case 'r':
+        if (sample.isSome()) {
+          sample->mResponsiveness = Some(entry.mTagDouble);
+        }
+        break;
+      case 'p':
+        if (sample.isSome()) {
+          sample->mPower = Some(entry.mTagDouble);
+        }
+        break;
+      case 'R':
+        if (sample.isSome()) {
+          sample->mRSS = Some(entry.mTagDouble);
+        }
+        break;
+      case 'U':
+        if (sample.isSome()) {
+          sample->mUSS = Some(entry.mTagDouble);
+         }
+        break;
+      case 'f':
+        if (sample.isSome()) {
+          sample->mFrameNumber = Some(entry.mTagInt);
+        }
+        break;
+      case 's':
+        {
+          // end the previous sample if there was one
+          if (sample.isSome()) {
+            WriteSample(aWriter, *sample);
+            sample.reset();
+          }
+          // begin the next sample
+          sample.emplace();
+          sample->mTime = currentTime;
+
+          // Seek forward through the entire sample, looking for frames
+          // this is an easier approach to reason about than adding more
+          // control variables and cases to the loop that goes through the buffer once
+
+          UniqueStacks::Stack stack =
+            aUniqueStacks.BeginStack(UniqueStacks::OnStackFrameKey("(root)"));
+
+          int framePos = (readPos + 1) % mEntrySize;
+          ProfileEntry frame = mEntries[framePos];
+          while (framePos != mWritePos && frame.mTagName != 's' && frame.mTagName != 'T') {
+            int incBy = 1;
+            frame = mEntries[framePos];
+
+            // Read ahead to the next tag, if it's a 'd' tag process it now
+            const char* tagStringData = frame.mTagData;
+            int readAheadPos = (framePos + 1) % mEntrySize;
+            // Make sure the string is always null terminated if it fills up
+            // DYNAMIC_MAX_STRING-2
+            tagBuff[DYNAMIC_MAX_STRING-1] = '\0';
+
+            if (readAheadPos != mWritePos && mEntries[readAheadPos].mTagName == 'd') {
+              tagStringData = processDynamicTag(framePos, &incBy, tagBuff.get());
+            }
+
+            // Write one frame. It can have either
+            // 1. only location - 'l' containing a memory address
+            // 2. location and line number - 'c' followed by 'd's,
+            // an optional 'n' and an optional 'y'
+            // 3. a JIT return address - 'j' containing native code address
+            if (frame.mTagName == 'l') {
+              // Bug 753041
+              // We need a double cast here to tell GCC that we don't want to sign
+              // extend 32-bit addresses starting with 0xFXXXXXX.
+              unsigned long long pc = (unsigned long long)(uintptr_t)frame.mTagPtr;
+              snprintf(tagBuff.get(), DYNAMIC_MAX_STRING, "%#llx", pc);
+              stack.AppendFrame(UniqueStacks::OnStackFrameKey(tagBuff.get()));
+            } else if (frame.mTagName == 'c') {
+              UniqueStacks::OnStackFrameKey frameKey(tagStringData);
+              readAheadPos = (framePos + incBy) % mEntrySize;
+              if (readAheadPos != mWritePos &&
+                  mEntries[readAheadPos].mTagName == 'n') {
+                frameKey.mLine = Some((unsigned) mEntries[readAheadPos].mTagInt);
+                incBy++;
+              }
+              readAheadPos = (framePos + incBy) % mEntrySize;
+              if (readAheadPos != mWritePos &&
+                  mEntries[readAheadPos].mTagName == 'y') {
+                frameKey.mCategory = Some((unsigned) mEntries[readAheadPos].mTagInt);
+                incBy++;
+              }
+              stack.AppendFrame(frameKey);
+#ifndef SPS_STANDALONE
+            } else if (frame.mTagName == 'J') {
+              // A JIT frame may expand to multiple frames due to inlining.
+              void* pc = frame.mTagPtr;
+              unsigned depth = aUniqueStacks.LookupJITFrameDepth(pc);
+              if (depth == 0) {
+                StreamJSFramesOp framesOp(pc, stack);
+                JS::ForEachProfiledFrame(aContext, pc, framesOp);
+                aUniqueStacks.AddJITFrameDepth(pc, framesOp.depth());
+              } else {
+                for (unsigned i = 0; i < depth; i++) {
+                  UniqueStacks::OnStackFrameKey inlineFrameKey(pc, i);
+                  stack.AppendFrame(inlineFrameKey);
+                }
+              }
+#endif
+            }
+            framePos = (framePos + incBy) % mEntrySize;
+          }
+
+          sample->mStack = stack.GetOrAddIndex();
+          break;
+        }
+      }
+    }
+    readPos = (readPos + 1) % mEntrySize;
+  }
+  if (sample.isSome()) {
+    WriteSample(aWriter, *sample);
+  }
+}
+
+void ProfileBuffer::StreamMarkersToJSON(SpliceableJSONWriter& aWriter, int aThreadId,
+                                        double aSinceTime, UniqueStacks& aUniqueStacks)
+{
+  int readPos = mReadPos;
+  int currentThreadID = -1;
+  while (readPos != mWritePos) {
+    ProfileEntry entry = mEntries[readPos];
+    if (entry.mTagName == 'T') {
+      currentThreadID = entry.mTagInt;
+    } else if (currentThreadID == aThreadId && entry.mTagName == 'm') {
+      const ProfilerMarker* marker = entry.getMarker();
+      if (marker->GetTime() >= aSinceTime) {
+        entry.getMarker()->StreamJSON(aWriter, aUniqueStacks);
+      }
+    }
+    readPos = (readPos + 1) % mEntrySize;
+  }
+}
+
+int ProfileBuffer::FindLastSampleOfThread(int aThreadId)
+{
+  // We search backwards from mWritePos-1 to mReadPos.
+  // Adding mEntrySize makes the result of the modulus positive.
+  for (int readPos  = (mWritePos + mEntrySize - 1) % mEntrySize;
+           readPos !=  (mReadPos + mEntrySize - 1) % mEntrySize;
+           readPos  =   (readPos + mEntrySize - 1) % mEntrySize) {
+    ProfileEntry entry = mEntries[readPos];
+    if (entry.mTagName == 'T' && entry.mTagInt == aThreadId) {
+      return readPos;
+    }
+  }
+
+  return -1;
+}
+
+void ProfileBuffer::DuplicateLastSample(int aThreadId)
+{
+  int lastSampleStartPos = FindLastSampleOfThread(aThreadId);
+  if (lastSampleStartPos == -1) {
+    return;
+  }
+
+  MOZ_ASSERT(mEntries[lastSampleStartPos].mTagName == 'T');
+
+  addTag(mEntries[lastSampleStartPos]);
+
+  // Go through the whole entry and duplicate it, until we find the next one.
+  for (int readPos = (lastSampleStartPos + 1) % mEntrySize;
+       readPos != mWritePos;
+       readPos = (readPos + 1) % mEntrySize) {
+    switch (mEntries[readPos].mTagName) {
+      case 'T':
+        // We're done.
+        return;
+      case 't':
+        // Copy with new time
+        addTag(ProfileEntry('t', (mozilla::TimeStamp::Now() - sStartTime).ToMilliseconds()));
+        break;
+      case 'm':
+        // Don't copy markers
+        break;
+      // Copy anything else we don't know about
+      // L, B, S, c, s, d, l, f, h, r, t, p
+      default:
+        addTag(mEntries[readPos]);
+        break;
+    }
+  }
+}
+
+// END ProfileBuffer
+////////////////////////////////////////////////////////////////////////
+
+
+////////////////////////////////////////////////////////////////////////
+// BEGIN ThreadProfile
+
+// END ThreadProfile
+////////////////////////////////////////////////////////////////////////
diff --git a/tools/profiler/core/ProfileEntry.h b/tools/profiler/core/ProfileEntry.h
new file mode 100644
index 000000000..b82a2f271
--- /dev/null
+++ b/tools/profiler/core/ProfileEntry.h
@@ -0,0 +1,407 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MOZ_PROFILE_ENTRY_H
+#define MOZ_PROFILE_ENTRY_H
+
+#include <ostream>
+#include "GeckoProfiler.h"
+#include "platform.h"
+#include "ProfileJSONWriter.h"
+#include "ProfilerBacktrace.h"
+#include "mozilla/RefPtr.h"
+#include <string>
+#include <map>
+#ifndef SPS_STANDALONE
+#include "js/ProfilingFrameIterator.h"
+#include "js/TrackedOptimizationInfo.h"
+#include "nsHashKeys.h"
+#include "nsDataHashtable.h"
+#endif
+#include "mozilla/Maybe.h"
+#include "mozilla/Vector.h"
+#ifndef SPS_STANDALONE
+#include "gtest/MozGtestFriend.h"
+#else
+#define FRIEND_TEST(a, b) // TODO Support standalone gtest
+#endif
+#include "mozilla/HashFunctions.h"
+#include "mozilla/UniquePtr.h"
+
+class ThreadProfile;
+
+// NB: Packing this structure has been shown to cause SIGBUS issues on ARM.
+#ifndef __arm__
+#pragma pack(push, 1)
+#endif
+
+class ProfileEntry
+{
+public:
+  ProfileEntry();
+
+  // aTagData must not need release (i.e. be a string from the text segment)
+  ProfileEntry(char aTagName, const char *aTagData);
+  ProfileEntry(char aTagName, void *aTagPtr);
+  ProfileEntry(char aTagName, ProfilerMarker *aTagMarker);
+  ProfileEntry(char aTagName, double aTagDouble);
+  ProfileEntry(char aTagName, uintptr_t aTagOffset);
+  ProfileEntry(char aTagName, Address aTagAddress);
+  ProfileEntry(char aTagName, int aTagLine);
+  ProfileEntry(char aTagName, char aTagChar);
+  bool is_ent_hint(char hintChar);
+  bool is_ent_hint();
+  bool is_ent(char tagName);
+  void* get_tagPtr();
+  const ProfilerMarker* getMarker() {
+    MOZ_ASSERT(mTagName == 'm');
+    return mTagMarker;
+  }
+
+  char getTagName() const { return mTagName; }
+
+private:
+  FRIEND_TEST(ThreadProfile, InsertOneTag);
+  FRIEND_TEST(ThreadProfile, InsertOneTagWithTinyBuffer);
+  FRIEND_TEST(ThreadProfile, InsertTagsNoWrap);
+  FRIEND_TEST(ThreadProfile, InsertTagsWrap);
+  FRIEND_TEST(ThreadProfile, MemoryMeasure);
+  friend class ProfileBuffer;
+  union {
+    const char* mTagData;
+    char        mTagChars[sizeof(void*)];
+    void*       mTagPtr;
+    ProfilerMarker* mTagMarker;
+    double      mTagDouble;
+    Address     mTagAddress;
+    uintptr_t   mTagOffset;
+    int         mTagInt;
+    char        mTagChar;
+  };
+  char mTagName;
+};
+
+#ifndef __arm__
+#pragma pack(pop)
+#endif
+
+class UniqueJSONStrings
+{
+public:
+  UniqueJSONStrings() {
+    mStringTableWriter.StartBareList();
+  }
+
+  void SpliceStringTableElements(SpliceableJSONWriter& aWriter) {
+    aWriter.TakeAndSplice(mStringTableWriter.WriteFunc());
+  }
+
+  void WriteProperty(mozilla::JSONWriter& aWriter, const char* aName, const char* aStr) {
+    aWriter.IntProperty(aName, GetOrAddIndex(aStr));
+  }
+
+  void WriteElement(mozilla::JSONWriter& aWriter, const char* aStr) {
+    aWriter.IntElement(GetOrAddIndex(aStr));
+  }
+
+  uint32_t GetOrAddIndex(const char* aStr);
+
+  struct StringKey {
+
+    explicit StringKey(const char* aStr)
+     : mStr(strdup(aStr))
+    {
+      mHash = mozilla::HashString(mStr);
+    }
+
+    StringKey(const StringKey& aOther)
+      : mStr(strdup(aOther.mStr))
+    {
+      mHash = aOther.mHash;
+    }
+
+    ~StringKey() {
+      free(mStr);
+    }
+
+    uint32_t Hash() const;
+    bool operator==(const StringKey& aOther) const {
+      return strcmp(mStr, aOther.mStr) == 0;
+    }
+    bool operator<(const StringKey& aOther) const {
+      return mHash < aOther.mHash;
+    }
+
+  private:
+    uint32_t mHash;
+    char* mStr;
+  };
+private:
+  SpliceableChunkedJSONWriter mStringTableWriter;
+  std::map<StringKey, uint32_t> mStringToIndexMap;
+};
+
+class UniqueStacks
+{
+public:
+  struct FrameKey {
+#ifdef SPS_STANDALONE
+    std::string mLocation;
+#else
+    // This cannot be a std::string, as it is not memmove compatible, which
+    // is used by nsHashTable
+    nsCString mLocation;
+#endif
+    mozilla::Maybe<unsigned> mLine;
+    mozilla::Maybe<unsigned> mCategory;
+    mozilla::Maybe<void*> mJITAddress;
+    mozilla::Maybe<uint32_t> mJITDepth;
+
+    explicit FrameKey(const char* aLocation)
+     : mLocation(aLocation)
+    {
+      mHash = Hash();
+    }
+
+    FrameKey(const FrameKey& aToCopy)
+     : mLocation(aToCopy.mLocation)
+     , mLine(aToCopy.mLine)
+     , mCategory(aToCopy.mCategory)
+     , mJITAddress(aToCopy.mJITAddress)
+     , mJITDepth(aToCopy.mJITDepth)
+    {
+      mHash = Hash();
+    }
+
+    FrameKey(void* aJITAddress, uint32_t aJITDepth)
+     : mJITAddress(mozilla::Some(aJITAddress))
+     , mJITDepth(mozilla::Some(aJITDepth))
+    {
+      mHash = Hash();
+    }
+
+    uint32_t Hash() const;
+    bool operator==(const FrameKey& aOther) const;
+    bool operator<(const FrameKey& aOther) const {
+      return mHash < aOther.mHash;
+    }
+
+  private:
+    uint32_t mHash;
+  };
+
+  // A FrameKey that holds a scoped reference to a JIT FrameHandle.
+  struct MOZ_STACK_CLASS OnStackFrameKey : public FrameKey {
+    explicit OnStackFrameKey(const char* aLocation)
+      : FrameKey(aLocation)
+#ifndef SPS_STANDALONE
+      , mJITFrameHandle(nullptr)
+#endif
+    { }
+
+    OnStackFrameKey(const OnStackFrameKey& aToCopy)
+      : FrameKey(aToCopy)
+#ifndef SPS_STANDALONE
+      , mJITFrameHandle(aToCopy.mJITFrameHandle)
+#endif
+    { }
+
+#ifndef SPS_STANDALONE
+    const JS::ForEachProfiledFrameOp::FrameHandle* mJITFrameHandle;
+
+    OnStackFrameKey(void* aJITAddress, unsigned aJITDepth)
+      : FrameKey(aJITAddress, aJITDepth)
+      , mJITFrameHandle(nullptr)
+    { }
+
+    OnStackFrameKey(void* aJITAddress, unsigned aJITDepth,
+                    const JS::ForEachProfiledFrameOp::FrameHandle& aJITFrameHandle)
+      : FrameKey(aJITAddress, aJITDepth)
+      , mJITFrameHandle(&aJITFrameHandle)
+    { }
+#endif
+  };
+
+  struct StackKey {
+    mozilla::Maybe<uint32_t> mPrefixHash;
+    mozilla::Maybe<uint32_t> mPrefix;
+    uint32_t mFrame;
+
+    explicit StackKey(uint32_t aFrame)
+     : mFrame(aFrame)
+    {
+      mHash = Hash();
+    }
+
+    uint32_t Hash() const;
+    bool operator==(const StackKey& aOther) const;
+    bool operator<(const StackKey& aOther) const {
+      return mHash < aOther.mHash;
+    }
+
+    void UpdateHash(uint32_t aPrefixHash, uint32_t aPrefix, uint32_t aFrame) {
+      mPrefixHash = mozilla::Some(aPrefixHash);
+      mPrefix = mozilla::Some(aPrefix);
+      mFrame = aFrame;
+      mHash = Hash();
+    }
+
+  private:
+    uint32_t mHash;
+  };
+
+  class Stack {
+  public:
+    Stack(UniqueStacks& aUniqueStacks, const OnStackFrameKey& aRoot);
+
+    void AppendFrame(const OnStackFrameKey& aFrame);
+    uint32_t GetOrAddIndex() const;
+
+  private:
+    UniqueStacks& mUniqueStacks;
+    StackKey mStack;
+  };
+
+  explicit UniqueStacks(JSContext* aContext);
+
+  Stack BeginStack(const OnStackFrameKey& aRoot);
+  uint32_t LookupJITFrameDepth(void* aAddr);
+  void AddJITFrameDepth(void* aAddr, unsigned depth);
+  void SpliceFrameTableElements(SpliceableJSONWriter& aWriter);
+  void SpliceStackTableElements(SpliceableJSONWriter& aWriter);
+
+private:
+  uint32_t GetOrAddFrameIndex(const OnStackFrameKey& aFrame);
+  uint32_t GetOrAddStackIndex(const StackKey& aStack);
+  void StreamFrame(const OnStackFrameKey& aFrame);
+  void StreamStack(const StackKey& aStack);
+
+public:
+  UniqueJSONStrings mUniqueStrings;
+
+private:
+  JSContext* mContext;
+
+  // To avoid incurring JitcodeGlobalTable lookup costs for every JIT frame,
+  // we cache the depth of frames keyed by JIT code address. If an address a
+  // maps to a depth d, then frames keyed by a for depths 0 to d are
+  // guaranteed to be in mFrameToIndexMap.
+  std::map<void*, uint32_t> mJITFrameDepthMap;
+
+  uint32_t mFrameCount;
+  SpliceableChunkedJSONWriter mFrameTableWriter;
+#ifdef SPS_STANDALNOE
+  std::map<FrameKey, uint32_t> mFrameToIndexMap;
+#else
+  nsDataHashtable<nsGenericHashKey<FrameKey>, uint32_t> mFrameToIndexMap;
+#endif
+
+  SpliceableChunkedJSONWriter mStackTableWriter;
+
+  // This sucks but this is really performance critical, nsDataHashtable is way faster
+  // than map/unordered_map but nsDataHashtable is tied to xpcom so we ifdef
+  // until we can find a better solution.
+#ifdef SPS_STANDALONE
+  std::map<StackKey, uint32_t> mStackToIndexMap;
+#else
+  nsDataHashtable<nsGenericHashKey<StackKey>, uint32_t> mStackToIndexMap;
+#endif
+};
+
+//
+// ThreadProfile JSON Format
+// -------------------------
+//
+// The profile contains much duplicate information. The output JSON of the
+// profile attempts to deduplicate strings, frames, and stack prefixes, to cut
+// down on size and to increase JSON streaming speed. Deduplicated values are
+// streamed as indices into their respective tables.
+//
+// Further, arrays of objects with the same set of properties (e.g., samples,
+// frames) are output as arrays according to a schema instead of an object
+// with property names. A property that is not present is represented in the
+// array as null or undefined.
+//
+// The format of the thread profile JSON is shown by the following example
+// with 1 sample and 1 marker:
+//
+// {
+//   "name": "Foo",
+//   "tid": 42,
+//   "samples":
+//   {
+//     "schema":
+//     {
+//       "stack": 0,           /* index into stackTable */
+//       "time": 1,            /* number */
+//       "responsiveness": 2,  /* number */
+//       "rss": 3,             /* number */
+//       "uss": 4,             /* number */
+//       "frameNumber": 5,     /* number */
+//       "power": 6            /* number */
+//     },
+//     "data":
+//     [
+//       [ 1, 0.0, 0.0 ]       /* { stack: 1, time: 0.0, responsiveness: 0.0 } */
+//     ]
+//   },
+//
+//   "markers":
+//   {
+//     "schema":
+//     {
+//       "name": 0,            /* index into stringTable */
+//       "time": 1,            /* number */
+//       "data": 2             /* arbitrary JSON */
+//     },
+//     "data":
+//     [
+//       [ 3, 0.1 ]            /* { name: 'example marker', time: 0.1 } */
+//     ]
+//   },
+//
+//   "stackTable":
+//   {
+//     "schema":
+//     {
+//       "prefix": 0,          /* index into stackTable */
+//       "frame": 1            /* index into frameTable */
+//     },
+//     "data":
+//     [
+//       [ null, 0 ],          /* (root) */
+//       [ 0,    1 ]           /* (root) > foo.js */
+//     ]
+//   },
+//
+//   "frameTable":
+//   {
+//     "schema":
+//     {
+//       "location": 0,        /* index into stringTable */
+//       "implementation": 1,  /* index into stringTable */
+//       "optimizations": 2,   /* arbitrary JSON */
+//       "line": 3,            /* number */
+//       "category": 4         /* number */
+//     },
+//     "data":
+//     [
+//       [ 0 ],                /* { location: '(root)' } */
+//       [ 1, 2 ]              /* { location: 'foo.js', implementation: 'baseline' } */
+//     ]
+//   },
+//
+//   "stringTable":
+//   [
+//     "(root)",
+//     "foo.js",
+//     "baseline",
+//     "example marker"
+//   ]
+// }
+//
+
+#endif /* ndef MOZ_PROFILE_ENTRY_H */
diff --git a/tools/profiler/core/ProfileJSONWriter.cpp b/tools/profiler/core/ProfileJSONWriter.cpp
new file mode 100644
index 000000000..65a9425a3
--- /dev/null
+++ b/tools/profiler/core/ProfileJSONWriter.cpp
@@ -0,0 +1,115 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/HashFunctions.h"
+
+#include "ProfileJSONWriter.h"
+
+void
+ChunkedJSONWriteFunc::Write(const char* aStr)
+{
+  MOZ_ASSERT(mChunkPtr >= mChunkList.back().get() && mChunkPtr <= mChunkEnd);
+  MOZ_ASSERT(mChunkEnd >= mChunkList.back().get() + mChunkLengths.back());
+  MOZ_ASSERT(*mChunkPtr == '\0');
+
+  size_t len = strlen(aStr);
+
+  // Most strings to be written are small, but subprocess profiles (e.g.,
+  // from the content process in e10s) may be huge. If the string is larger
+  // than a chunk, allocate its own chunk.
+  char* newPtr;
+  if (len >= kChunkSize) {
+    AllocChunk(len + 1);
+    newPtr = mChunkPtr + len;
+  } else {
+    newPtr = mChunkPtr + len;
+    if (newPtr >= mChunkEnd) {
+      AllocChunk(kChunkSize);
+      newPtr = mChunkPtr + len;
+    }
+  }
+
+  memcpy(mChunkPtr, aStr, len);
+  *newPtr = '\0';
+  mChunkPtr = newPtr;
+  mChunkLengths.back() += len;
+}
+
+mozilla::UniquePtr<char[]>
+ChunkedJSONWriteFunc::CopyData() const
+{
+  MOZ_ASSERT(mChunkLengths.length() == mChunkList.length());
+  size_t totalLen = 1;
+  for (size_t i = 0; i < mChunkLengths.length(); i++) {
+    MOZ_ASSERT(strlen(mChunkList[i].get()) == mChunkLengths[i]);
+    totalLen += mChunkLengths[i];
+  }
+  mozilla::UniquePtr<char[]> c = mozilla::MakeUnique<char[]>(totalLen);
+  char* ptr = c.get();
+  for (size_t i = 0; i < mChunkList.length(); i++) {
+    size_t len = mChunkLengths[i];
+    memcpy(ptr, mChunkList[i].get(), len);
+    ptr += len;
+  }
+  *ptr = '\0';
+  return c;
+}
+
+void
+ChunkedJSONWriteFunc::Take(ChunkedJSONWriteFunc&& aOther)
+{
+  for (size_t i = 0; i < aOther.mChunkList.length(); i++) {
+    MOZ_ALWAYS_TRUE(mChunkLengths.append(aOther.mChunkLengths[i]));
+    MOZ_ALWAYS_TRUE(mChunkList.append(mozilla::Move(aOther.mChunkList[i])));
+  }
+  mChunkPtr = mChunkList.back().get() + mChunkLengths.back();
+  mChunkEnd = mChunkPtr;
+  aOther.mChunkPtr = nullptr;
+  aOther.mChunkEnd = nullptr;
+  aOther.mChunkList.clear();
+  aOther.mChunkLengths.clear();
+}
+
+void
+ChunkedJSONWriteFunc::AllocChunk(size_t aChunkSize)
+{
+  MOZ_ASSERT(mChunkLengths.length() == mChunkList.length());
+  mozilla::UniquePtr<char[]> newChunk = mozilla::MakeUnique<char[]>(aChunkSize);
+  mChunkPtr = newChunk.get();
+  mChunkEnd = mChunkPtr + aChunkSize;
+  *mChunkPtr = '\0';
+  MOZ_ALWAYS_TRUE(mChunkLengths.append(0));
+  MOZ_ALWAYS_TRUE(mChunkList.append(mozilla::Move(newChunk)));
+}
+
+void
+SpliceableJSONWriter::TakeAndSplice(ChunkedJSONWriteFunc* aFunc)
+{
+  Separator();
+  for (size_t i = 0; i < aFunc->mChunkList.length(); i++) {
+    WriteFunc()->Write(aFunc->mChunkList[i].get());
+  }
+  aFunc->mChunkPtr = nullptr;
+  aFunc->mChunkEnd = nullptr;
+  aFunc->mChunkList.clear();
+  aFunc->mChunkLengths.clear();
+  mNeedComma[mDepth] = true;
+}
+
+void
+SpliceableJSONWriter::Splice(const char* aStr)
+{
+  Separator();
+  WriteFunc()->Write(aStr);
+  mNeedComma[mDepth] = true;
+}
+
+void
+SpliceableChunkedJSONWriter::TakeAndSplice(ChunkedJSONWriteFunc* aFunc)
+{
+  Separator();
+  WriteFunc()->Take(mozilla::Move(*aFunc));
+  mNeedComma[mDepth] = true;
+}
diff --git a/tools/profiler/core/ProfileJSONWriter.h b/tools/profiler/core/ProfileJSONWriter.h
new file mode 100644
index 000000000..d9e2115f9
--- /dev/null
+++ b/tools/profiler/core/ProfileJSONWriter.h
@@ -0,0 +1,126 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef PROFILEJSONWRITER_H
+#define PROFILEJSONWRITER_H
+
+#include <ostream>
+#include <string>
+#include <string.h>
+
+#include "mozilla/JSONWriter.h"
+#include "mozilla/UniquePtr.h"
+
+class SpliceableChunkedJSONWriter;
+
+// On average, profile JSONs are large enough such that we want to avoid
+// reallocating its buffer when expanding. Additionally, the contents of the
+// profile are not accessed until the profile is entirely written. For these
+// reasons we use a chunked writer that keeps an array of chunks, which is
+// concatenated together after writing is finished.
+class ChunkedJSONWriteFunc : public mozilla::JSONWriteFunc
+{
+public:
+  friend class SpliceableJSONWriter;
+
+  ChunkedJSONWriteFunc() {
+    AllocChunk(kChunkSize);
+  }
+
+  bool IsEmpty() const {
+    MOZ_ASSERT_IF(!mChunkPtr, !mChunkEnd &&
+                              mChunkList.length() == 0 &&
+                              mChunkLengths.length() == 0);
+    return !mChunkPtr;
+  }
+
+  void Write(const char* aStr) override;
+  mozilla::UniquePtr<char[]> CopyData() const;
+  void Take(ChunkedJSONWriteFunc&& aOther);
+
+private:
+  void AllocChunk(size_t aChunkSize);
+
+  static const size_t kChunkSize = 4096 * 512;
+
+  // Pointer for writing inside the current chunk.
+  //
+  // The current chunk is always at the back of mChunkList, i.e.,
+  // mChunkList.back() <= mChunkPtr <= mChunkEnd.
+  char* mChunkPtr;
+
+  // Pointer to the end of the current chunk.
+  //
+  // The current chunk is always at the back of mChunkList, i.e.,
+  // mChunkEnd >= mChunkList.back() + mChunkLengths.back().
+  char* mChunkEnd;
+
+  // List of chunks and their lengths.
+  //
+  // For all i, the length of the string in mChunkList[i] is
+  // mChunkLengths[i].
+  mozilla::Vector<mozilla::UniquePtr<char[]>> mChunkList;
+  mozilla::Vector<size_t> mChunkLengths;
+};
+
+struct OStreamJSONWriteFunc : public mozilla::JSONWriteFunc
+{
+  explicit OStreamJSONWriteFunc(std::ostream& aStream)
+    : mStream(aStream)
+  { }
+
+  void Write(const char* aStr) override {
+    mStream << aStr;
+  }
+
+  std::ostream& mStream;
+};
+
+class SpliceableJSONWriter : public mozilla::JSONWriter
+{
+public:
+  explicit SpliceableJSONWriter(mozilla::UniquePtr<mozilla::JSONWriteFunc> aWriter)
+    : JSONWriter(mozilla::Move(aWriter))
+  { }
+
+  void StartBareList(CollectionStyle aStyle = SingleLineStyle) {
+    StartCollection(nullptr, "", aStyle);
+  }
+
+  void EndBareList() {
+    EndCollection("");
+  }
+
+  void NullElements(uint32_t aCount) {
+    for (uint32_t i = 0; i < aCount; i++) {
+      NullElement();
+    }
+  }
+
+  void Splice(const ChunkedJSONWriteFunc* aFunc);
+  void Splice(const char* aStr);
+
+  // Takes the chunks from aFunc and write them. If move is not possible
+  // (e.g., using OStreamJSONWriteFunc), aFunc's chunks are copied and its
+  // storage cleared.
+  virtual void TakeAndSplice(ChunkedJSONWriteFunc* aFunc);
+};
+
+class SpliceableChunkedJSONWriter : public SpliceableJSONWriter
+{
+public:
+  explicit SpliceableChunkedJSONWriter()
+    : SpliceableJSONWriter(mozilla::MakeUnique<ChunkedJSONWriteFunc>())
+  { }
+
+  ChunkedJSONWriteFunc* WriteFunc() const {
+    return static_cast<ChunkedJSONWriteFunc*>(JSONWriter::WriteFunc());
+  }
+
+  // Adopts the chunks from aFunc without copying.
+  virtual void TakeAndSplice(ChunkedJSONWriteFunc* aFunc) override;
+};
+
+#endif // PROFILEJSONWRITER_H
diff --git a/tools/profiler/core/ProfilerBacktrace.cpp b/tools/profiler/core/ProfilerBacktrace.cpp
new file mode 100644
index 000000000..7302dd64c
--- /dev/null
+++ b/tools/profiler/core/ProfilerBacktrace.cpp
@@ -0,0 +1,33 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ProfilerBacktrace.h"
+
+#include "ProfileJSONWriter.h"
+#include "SyncProfile.h"
+
+ProfilerBacktrace::ProfilerBacktrace(SyncProfile* aProfile)
+  : mProfile(aProfile)
+{
+  MOZ_COUNT_CTOR(ProfilerBacktrace);
+  MOZ_ASSERT(aProfile);
+}
+
+ProfilerBacktrace::~ProfilerBacktrace()
+{
+  MOZ_COUNT_DTOR(ProfilerBacktrace);
+  if (mProfile->ShouldDestroy()) {
+    delete mProfile;
+  }
+}
+
+void
+ProfilerBacktrace::StreamJSON(SpliceableJSONWriter& aWriter,
+                              UniqueStacks& aUniqueStacks)
+{
+  ::MutexAutoLock lock(mProfile->GetMutex());
+  mProfile->StreamJSON(aWriter, aUniqueStacks);
+}
diff --git a/tools/profiler/core/ProfilerMarkers.cpp b/tools/profiler/core/ProfilerMarkers.cpp
new file mode 100644
index 000000000..3cb47de48
--- /dev/null
+++ b/tools/profiler/core/ProfilerMarkers.cpp
@@ -0,0 +1,210 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GeckoProfiler.h"
+#include "ProfilerBacktrace.h"
+#include "ProfilerMarkers.h"
+#include "SyncProfile.h"
+#ifndef SPS_STANDALONE
+#include "gfxASurface.h"
+#include "Layers.h"
+#include "mozilla/Sprintf.h"
+#endif
+
+ProfilerMarkerPayload::ProfilerMarkerPayload(ProfilerBacktrace* aStack)
+  : mStack(aStack)
+{}
+
+ProfilerMarkerPayload::ProfilerMarkerPayload(const mozilla::TimeStamp& aStartTime,
+                                             const mozilla::TimeStamp& aEndTime,
+                                             ProfilerBacktrace* aStack)
+  : mStartTime(aStartTime)
+  , mEndTime(aEndTime)
+  , mStack(aStack)
+{}
+
+ProfilerMarkerPayload::~ProfilerMarkerPayload()
+{
+  profiler_free_backtrace(mStack);
+}
+
+void
+ProfilerMarkerPayload::streamCommonProps(const char* aMarkerType,
+                                         SpliceableJSONWriter& aWriter,
+                                         UniqueStacks& aUniqueStacks)
+{
+  MOZ_ASSERT(aMarkerType);
+  aWriter.StringProperty("type", aMarkerType);
+  if (!mStartTime.IsNull()) {
+    aWriter.DoubleProperty("startTime", profiler_time(mStartTime));
+  }
+  if (!mEndTime.IsNull()) {
+    aWriter.DoubleProperty("endTime", profiler_time(mEndTime));
+  }
+  if (mStack) {
+    aWriter.StartObjectProperty("stack");
+    {
+      mStack->StreamJSON(aWriter, aUniqueStacks);
+    }
+    aWriter.EndObject();
+  }
+}
+
+ProfilerMarkerTracing::ProfilerMarkerTracing(const char* aCategory, TracingMetadata aMetaData)
+  : mCategory(aCategory)
+  , mMetaData(aMetaData)
+{
+  if (aMetaData == TRACING_EVENT_BACKTRACE) {
+    SetStack(profiler_get_backtrace());
+  }
+}
+
+ProfilerMarkerTracing::ProfilerMarkerTracing(const char* aCategory, TracingMetadata aMetaData,
+                                             ProfilerBacktrace* aCause)
+  : mCategory(aCategory)
+  , mMetaData(aMetaData)
+{
+  if (aCause) {
+    SetStack(aCause);
+  }
+}
+
+void
+ProfilerMarkerTracing::StreamPayload(SpliceableJSONWriter& aWriter,
+                                     UniqueStacks& aUniqueStacks)
+{
+  streamCommonProps("tracing", aWriter, aUniqueStacks);
+
+  if (GetCategory()) {
+    aWriter.StringProperty("category", GetCategory());
+  }
+  if (GetMetaData() != TRACING_DEFAULT) {
+    if (GetMetaData() == TRACING_INTERVAL_START) {
+      aWriter.StringProperty("interval", "start");
+    } else if (GetMetaData() == TRACING_INTERVAL_END) {
+      aWriter.StringProperty("interval", "end");
+    }
+  }
+}
+
+#ifndef SPS_STANDALONE
+GPUMarkerPayload::GPUMarkerPayload(
+  const mozilla::TimeStamp& aCpuTimeStart,
+  const mozilla::TimeStamp& aCpuTimeEnd,
+  uint64_t aGpuTimeStart,
+  uint64_t aGpuTimeEnd)
+
+  : ProfilerMarkerPayload(aCpuTimeStart, aCpuTimeEnd)
+  , mCpuTimeStart(aCpuTimeStart)
+  , mCpuTimeEnd(aCpuTimeEnd)
+  , mGpuTimeStart(aGpuTimeStart)
+  , mGpuTimeEnd(aGpuTimeEnd)
+{ }
+
+void
+GPUMarkerPayload::StreamPayload(SpliceableJSONWriter& aWriter,
+                                UniqueStacks& aUniqueStacks)
+{
+  streamCommonProps("gpu_timer_query", aWriter, aUniqueStacks);
+
+  aWriter.DoubleProperty("cpustart", profiler_time(mCpuTimeStart));
+  aWriter.DoubleProperty("cpuend", profiler_time(mCpuTimeEnd));
+  aWriter.IntProperty("gpustart", (int)mGpuTimeStart);
+  aWriter.IntProperty("gpuend", (int)mGpuTimeEnd);
+}
+
+ProfilerMarkerImagePayload::ProfilerMarkerImagePayload(gfxASurface *aImg)
+  : mImg(aImg)
+{ }
+
+void
+ProfilerMarkerImagePayload::StreamPayload(SpliceableJSONWriter& aWriter,
+                                          UniqueStacks& aUniqueStacks)
+{
+  streamCommonProps("innerHTML", aWriter, aUniqueStacks);
+  // TODO: Finish me
+  //aWriter.NameValue("innerHTML", "<img src=''/>");
+}
+
+IOMarkerPayload::IOMarkerPayload(const char* aSource,
+                                 const char* aFilename,
+                                 const mozilla::TimeStamp& aStartTime,
+                                 const mozilla::TimeStamp& aEndTime,
+                                 ProfilerBacktrace* aStack)
+  : ProfilerMarkerPayload(aStartTime, aEndTime, aStack),
+    mSource(aSource)
+{
+  mFilename = aFilename ? strdup(aFilename) : nullptr;
+  MOZ_ASSERT(aSource);
+}
+
+IOMarkerPayload::~IOMarkerPayload(){
+  free(mFilename);
+}
+
+void
+IOMarkerPayload::StreamPayload(SpliceableJSONWriter& aWriter, UniqueStacks& aUniqueStacks)
+{
+  streamCommonProps("io", aWriter, aUniqueStacks);
+  aWriter.StringProperty("source", mSource);
+  if (mFilename != nullptr) {
+    aWriter.StringProperty("filename", mFilename);
+  }
+}
+
+void
+ProfilerJSEventMarker(const char *event)
+{
+    PROFILER_MARKER(event);
+}
+
+LayerTranslationPayload::LayerTranslationPayload(mozilla::layers::Layer* aLayer,
+                                                 mozilla::gfx::Point aPoint)
+  : ProfilerMarkerPayload(mozilla::TimeStamp::Now(), mozilla::TimeStamp::Now(), nullptr)
+  , mLayer(aLayer)
+  , mPoint(aPoint)
+{
+}
+
+void
+LayerTranslationPayload::StreamPayload(SpliceableJSONWriter& aWriter,
+                                       UniqueStacks& aUniqueStacks)
+{
+  const size_t bufferSize = 32;
+  char buffer[bufferSize];
+  SprintfLiteral(buffer, "%p", mLayer);
+
+  aWriter.StringProperty("layer", buffer);
+  aWriter.IntProperty("x", mPoint.x);
+  aWriter.IntProperty("y", mPoint.y);
+  aWriter.StringProperty("category", "LayerTranslation");
+}
+
+TouchDataPayload::TouchDataPayload(const mozilla::ScreenIntPoint& aPoint)
+  : ProfilerMarkerPayload(mozilla::TimeStamp::Now(), mozilla::TimeStamp::Now(), nullptr)
+{
+  mPoint = aPoint;
+}
+
+void
+TouchDataPayload::StreamPayload(SpliceableJSONWriter& aWriter, UniqueStacks& aUniqueStacks)
+{
+  aWriter.IntProperty("x", mPoint.x);
+  aWriter.IntProperty("y", mPoint.y);
+}
+
+VsyncPayload::VsyncPayload(mozilla::TimeStamp aVsyncTimestamp)
+  : ProfilerMarkerPayload(aVsyncTimestamp, aVsyncTimestamp, nullptr)
+  , mVsyncTimestamp(aVsyncTimestamp)
+{
+}
+
+void
+VsyncPayload::StreamPayload(SpliceableJSONWriter& aWriter, UniqueStacks& aUniqueStacks)
+{
+  aWriter.DoubleProperty("vsync", profiler_time(mVsyncTimestamp));
+  aWriter.StringProperty("category", "VsyncTimestamp");
+}
+#endif
diff --git a/tools/profiler/core/StackTop.cpp b/tools/profiler/core/StackTop.cpp
new file mode 100644
index 000000000..1f7944e5e
--- /dev/null
+++ b/tools/profiler/core/StackTop.cpp
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifdef XP_MACOSX
+#include <mach/task.h>
+#include <mach/thread_act.h>
+#include <pthread.h>
+#elif XP_WIN
+#include <windows.h>
+#endif
+
+#include "StackTop.h"
+
+void *GetStackTop(void *guess) {
+#if defined(XP_MACOSX)
+  pthread_t thread = pthread_self();
+  return pthread_get_stackaddr_np(thread);
+#elif defined(XP_WIN)
+#if defined(_MSC_VER) && defined(_M_IX86)
+  // offset 0x18 from the FS segment register gives a pointer to
+  // the thread information block for the current thread
+  NT_TIB* pTib;
+  __asm {
+    MOV EAX, FS:[18h]
+      MOV pTib, EAX
+  }
+  return static_cast<void*>(pTib->StackBase);
+#elif defined(__GNUC__) && defined(i386)
+  // offset 0x18 from the FS segment register gives a pointer to
+  // the thread information block for the current thread
+  NT_TIB* pTib;
+  asm ( "movl %%fs:0x18, %0\n"
+       : "=r" (pTib)
+      );
+  return static_cast<void*>(pTib->StackBase);
+#elif defined(_M_X64) || defined(__x86_64)
+  PNT_TIB64 pTib = reinterpret_cast<PNT_TIB64>(NtCurrentTeb());
+  return reinterpret_cast<void*>(pTib->StackBase);
+#else
+#error Need a way to get the stack bounds on this platform (Windows)
+#endif
+#else
+  return guess;
+#endif
+}
diff --git a/tools/profiler/core/StackTop.h b/tools/profiler/core/StackTop.h
new file mode 100644
index 000000000..a933d10b4
--- /dev/null
+++ b/tools/profiler/core/StackTop.h
@@ -0,0 +1,10 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MOZ_STACK_TOP_H
+#define MOZ_STACK_TOP_H
+void *GetStackTop(void *guess);
+#endif
diff --git a/tools/profiler/core/SyncProfile.cpp b/tools/profiler/core/SyncProfile.cpp
new file mode 100644
index 000000000..4c4742f34
--- /dev/null
+++ b/tools/profiler/core/SyncProfile.cpp
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "SyncProfile.h"
+
+SyncProfile::SyncProfile(ThreadInfo* aInfo, int aEntrySize)
+  : ThreadProfile(aInfo, new ProfileBuffer(aEntrySize))
+  , mOwnerState(REFERENCED)
+{
+  MOZ_COUNT_CTOR(SyncProfile);
+}
+
+SyncProfile::~SyncProfile()
+{
+  MOZ_COUNT_DTOR(SyncProfile);
+
+  // SyncProfile owns the ThreadInfo; see NewSyncProfile.
+  ThreadInfo* info = GetThreadInfo();
+  delete info;
+}
+
+bool
+SyncProfile::ShouldDestroy()
+{
+  ::MutexAutoLock lock(GetMutex());
+  if (mOwnerState == OWNED) {
+    mOwnerState = OWNER_DESTROYING;
+    return true;
+  }
+  mOwnerState = ORPHANED;
+  return false;
+}
+
+void
+SyncProfile::EndUnwind()
+{
+  if (mOwnerState != ORPHANED) {
+    mOwnerState = OWNED;
+  }
+  // Save mOwnerState before we release the mutex
+  OwnerState ownerState = mOwnerState;
+  ThreadProfile::EndUnwind();
+  if (ownerState == ORPHANED) {
+    delete this;
+  }
+}
+
+// SyncProfiles' stacks are deduplicated in the context of the containing
+// profile in which the backtrace is as a marker payload.
+void
+SyncProfile::StreamJSON(SpliceableJSONWriter& aWriter, UniqueStacks& aUniqueStacks)
+{
+  ThreadProfile::StreamSamplesAndMarkers(aWriter, /* aSinceTime = */ 0, aUniqueStacks);
+}
diff --git a/tools/profiler/core/SyncProfile.h b/tools/profiler/core/SyncProfile.h
new file mode 100644
index 000000000..58f6b0d81
--- /dev/null
+++ b/tools/profiler/core/SyncProfile.h
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef __SYNCPROFILE_H
+#define __SYNCPROFILE_H
+
+#include "ProfileEntry.h"
+#include "ThreadProfile.h"
+
+class SyncProfile : public ThreadProfile
+{
+public:
+  SyncProfile(ThreadInfo* aInfo, int aEntrySize);
+  ~SyncProfile();
+
+  // SyncProfiles' stacks are deduplicated in the context of the containing
+  // profile in which the backtrace is as a marker payload.
+  void StreamJSON(SpliceableJSONWriter& aWriter, UniqueStacks& aUniqueStacks);
+
+  virtual void EndUnwind();
+  virtual SyncProfile* AsSyncProfile() { return this; }
+
+private:
+  friend class ProfilerBacktrace;
+
+  enum OwnerState
+  {
+    REFERENCED,       // ProfilerBacktrace has a pointer to this but doesn't own
+    OWNED,            // ProfilerBacktrace is responsible for destroying this
+    OWNER_DESTROYING, // ProfilerBacktrace owns this and is destroying
+    ORPHANED          // No owner, we must destroy ourselves
+  };
+
+  bool ShouldDestroy();
+
+  OwnerState mOwnerState;
+};
+
+#endif // __SYNCPROFILE_H
+
diff --git a/tools/profiler/core/ThreadInfo.cpp b/tools/profiler/core/ThreadInfo.cpp
new file mode 100644
index 000000000..0e25d2330
--- /dev/null
+++ b/tools/profiler/core/ThreadInfo.cpp
@@ -0,0 +1,73 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ThreadInfo.h"
+#include "ThreadProfile.h"
+
+#include "mozilla/DebugOnly.h"
+
+ThreadInfo::ThreadInfo(const char* aName, int aThreadId,
+                       bool aIsMainThread, PseudoStack* aPseudoStack,
+                       void* aStackTop)
+  : mName(strdup(aName))
+  , mThreadId(aThreadId)
+  , mIsMainThread(aIsMainThread)
+  , mPseudoStack(aPseudoStack)
+  , mPlatformData(Sampler::AllocPlatformData(aThreadId))
+  , mProfile(nullptr)
+  , mStackTop(aStackTop)
+  , mPendingDelete(false)
+{
+  MOZ_COUNT_CTOR(ThreadInfo);
+#ifndef SPS_STANDALONE
+  mThread = NS_GetCurrentThread();
+#endif
+
+  // We don't have to guess on mac
+#ifdef XP_MACOSX
+  pthread_t self = pthread_self();
+  mStackTop = pthread_get_stackaddr_np(self);
+#endif
+}
+
+ThreadInfo::~ThreadInfo() {
+  MOZ_COUNT_DTOR(ThreadInfo);
+  free(mName);
+
+  if (mProfile)
+    delete mProfile;
+
+  Sampler::FreePlatformData(mPlatformData);
+}
+
+void
+ThreadInfo::SetPendingDelete()
+{
+  mPendingDelete = true;
+  // We don't own the pseudostack so disconnect it.
+  mPseudoStack = nullptr;
+  if (mProfile) {
+    mProfile->SetPendingDelete();
+  }
+}
+
+bool
+ThreadInfo::CanInvokeJS() const
+{
+#ifdef SPS_STANDALONE
+  return false;
+#else
+  nsIThread* thread = GetThread();
+  if (!thread) {
+    MOZ_ASSERT(IsMainThread());
+    return true;
+  }
+  bool result;
+  mozilla::DebugOnly<nsresult> rv = thread->GetCanInvokeJS(&result);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+  return result;
+#endif
+}
diff --git a/tools/profiler/core/ThreadInfo.h b/tools/profiler/core/ThreadInfo.h
new file mode 100644
index 000000000..1cb4e5dc8
--- /dev/null
+++ b/tools/profiler/core/ThreadInfo.h
@@ -0,0 +1,66 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MOZ_THREAD_INFO_H
+#define MOZ_THREAD_INFO_H
+
+#include "platform.h"
+
+class ThreadInfo {
+ public:
+  ThreadInfo(const char* aName, int aThreadId, bool aIsMainThread, PseudoStack* aPseudoStack, void* aStackTop);
+
+  virtual ~ThreadInfo();
+
+  const char* Name() const { return mName; }
+  int ThreadId() const { return mThreadId; }
+
+  bool IsMainThread() const { return mIsMainThread; }
+  PseudoStack* Stack() const { return mPseudoStack; }
+
+  void SetProfile(ThreadProfile* aProfile) { mProfile = aProfile; }
+  ThreadProfile* Profile() const { return mProfile; }
+
+  PlatformData* GetPlatformData() const { return mPlatformData; }
+  void* StackTop() const { return mStackTop; }
+
+  virtual void SetPendingDelete();
+  bool IsPendingDelete() const { return mPendingDelete; }
+
+#ifndef SPS_STANDALONE
+  /**
+   * May be null for the main thread if the profiler was started during startup
+   */
+  nsIThread* GetThread() const { return mThread.get(); }
+
+#endif
+
+  bool CanInvokeJS() const;
+
+ private:
+  char* mName;
+  int mThreadId;
+  const bool mIsMainThread;
+  PseudoStack* mPseudoStack;
+  PlatformData* mPlatformData;
+  ThreadProfile* mProfile;
+  void* mStackTop;
+#ifndef SPS_STANDALONE
+  nsCOMPtr<nsIThread> mThread;
+#endif
+  bool mPendingDelete;
+};
+
+// Just like ThreadInfo, but owns a reference to the PseudoStack.
+class StackOwningThreadInfo : public ThreadInfo {
+ public:
+  StackOwningThreadInfo(const char* aName, int aThreadId, bool aIsMainThread, PseudoStack* aPseudoStack, void* aStackTop);
+  virtual ~StackOwningThreadInfo();
+
+  virtual void SetPendingDelete();
+};
+
+#endif
diff --git a/tools/profiler/core/ThreadProfile.cpp b/tools/profiler/core/ThreadProfile.cpp
new file mode 100644
index 000000000..7452a7ee8
--- /dev/null
+++ b/tools/profiler/core/ThreadProfile.cpp
@@ -0,0 +1,260 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+ThreadProfile::ThreadProfile(ThreadInfo* aInfo, ProfileBuffer* aBuffer)
+  : mThreadInfo(aInfo)
+  , mBuffer(aBuffer)
+  , mPseudoStack(aInfo->Stack())
+  , mMutex(OS::CreateMutex("ThreadProfile::mMutex"))
+  , mThreadId(int(aInfo->ThreadId()))
+  , mIsMainThread(aInfo->IsMainThread())
+  , mPlatformData(aInfo->GetPlatformData())
+  , mStackTop(aInfo->StackTop())
+#ifndef SPS_STANDALONE
+  , mRespInfo(this)
+#endif
+#ifdef XP_LINUX
+  , mRssMemory(0)
+  , mUssMemory(0)
+#endif
+{
+  MOZ_COUNT_CTOR(ThreadProfile);
+  MOZ_ASSERT(aBuffer);
+
+  // I don't know if we can assert this. But we should warn.
+  MOZ_ASSERT(aInfo->ThreadId() >= 0, "native thread ID is < 0");
+  MOZ_ASSERT(aInfo->ThreadId() <= INT32_MAX, "native thread ID is > INT32_MAX");
+}
+
+ThreadProfile::~ThreadProfile()
+{
+  MOZ_COUNT_DTOR(ThreadProfile);
+}
+
+void ThreadProfile::addTag(const ProfileEntry& aTag)
+{
+  mBuffer->addTag(aTag);
+}
+
+void ThreadProfile::addStoredMarker(ProfilerMarker *aStoredMarker) {
+  mBuffer->addStoredMarker(aStoredMarker);
+}
+
+void ThreadProfile::StreamJSON(SpliceableJSONWriter& aWriter, double aSinceTime)
+{
+  // mUniqueStacks may already be emplaced from FlushSamplesAndMarkers.
+  if (!mUniqueStacks.isSome()) {
+#ifndef SPS_STANDALONE
+    mUniqueStacks.emplace(mPseudoStack->mContext);
+#else
+    mUniqueStacks.emplace(nullptr);
+#endif
+  }
+
+  aWriter.Start(SpliceableJSONWriter::SingleLineStyle);
+  {
+    StreamSamplesAndMarkers(aWriter, aSinceTime, *mUniqueStacks);
+
+    aWriter.StartObjectProperty("stackTable");
+    {
+      {
+        JSONSchemaWriter schema(aWriter);
+        schema.WriteField("prefix");
+        schema.WriteField("frame");
+      }
+
+      aWriter.StartArrayProperty("data");
+      {
+        mUniqueStacks->SpliceStackTableElements(aWriter);
+      }
+      aWriter.EndArray();
+    }
+    aWriter.EndObject();
+
+    aWriter.StartObjectProperty("frameTable");
+    {
+      {
+        JSONSchemaWriter schema(aWriter);
+        schema.WriteField("location");
+        schema.WriteField("implementation");
+        schema.WriteField("optimizations");
+        schema.WriteField("line");
+        schema.WriteField("category");
+      }
+
+      aWriter.StartArrayProperty("data");
+      {
+        mUniqueStacks->SpliceFrameTableElements(aWriter);
+      }
+      aWriter.EndArray();
+    }
+    aWriter.EndObject();
+
+    aWriter.StartArrayProperty("stringTable");
+    {
+      mUniqueStacks->mUniqueStrings.SpliceStringTableElements(aWriter);
+    }
+    aWriter.EndArray();
+  }
+  aWriter.End();
+
+  mUniqueStacks.reset();
+}
+
+void ThreadProfile::StreamSamplesAndMarkers(SpliceableJSONWriter& aWriter, double aSinceTime,
+                                            UniqueStacks& aUniqueStacks)
+{
+#ifndef SPS_STANDALONE
+  // Thread meta data
+  if (XRE_GetProcessType() == GeckoProcessType_Plugin) {
+    // TODO Add the proper plugin name
+    aWriter.StringProperty("name", "Plugin");
+  } else if (XRE_GetProcessType() == GeckoProcessType_Content) {
+    // This isn't going to really help once we have multiple content
+    // processes, but it'll do for now.
+    aWriter.StringProperty("name", "Content");
+  } else {
+    aWriter.StringProperty("name", Name());
+  }
+#else
+  aWriter.StringProperty("name", Name());
+#endif
+
+  aWriter.IntProperty("tid", static_cast<int>(mThreadId));
+
+  aWriter.StartObjectProperty("samples");
+  {
+    {
+      JSONSchemaWriter schema(aWriter);
+      schema.WriteField("stack");
+      schema.WriteField("time");
+      schema.WriteField("responsiveness");
+      schema.WriteField("rss");
+      schema.WriteField("uss");
+      schema.WriteField("frameNumber");
+      schema.WriteField("power");
+    }
+
+    aWriter.StartArrayProperty("data");
+    {
+      if (mSavedStreamedSamples) {
+        // We would only have saved streamed samples during shutdown
+        // streaming, which cares about dumping the entire buffer, and thus
+        // should have passed in 0 for aSinceTime.
+        MOZ_ASSERT(aSinceTime == 0);
+        aWriter.Splice(mSavedStreamedSamples.get());
+        mSavedStreamedSamples.reset();
+      }
+      mBuffer->StreamSamplesToJSON(aWriter, mThreadId, aSinceTime,
+#ifndef SPS_STANDALONE
+                                   mPseudoStack->mContext,
+#else
+                                   nullptr,
+#endif
+                                   aUniqueStacks);
+    }
+    aWriter.EndArray();
+  }
+  aWriter.EndObject();
+
+  aWriter.StartObjectProperty("markers");
+  {
+    {
+      JSONSchemaWriter schema(aWriter);
+      schema.WriteField("name");
+      schema.WriteField("time");
+      schema.WriteField("data");
+    }
+
+    aWriter.StartArrayProperty("data");
+    {
+      if (mSavedStreamedMarkers) {
+        MOZ_ASSERT(aSinceTime == 0);
+        aWriter.Splice(mSavedStreamedMarkers.get());
+        mSavedStreamedMarkers.reset();
+      }
+      mBuffer->StreamMarkersToJSON(aWriter, mThreadId, aSinceTime, aUniqueStacks);
+    }
+    aWriter.EndArray();
+  }
+  aWriter.EndObject();
+}
+
+void ThreadProfile::FlushSamplesAndMarkers()
+{
+  // This function is used to serialize the current buffer just before
+  // JSContext destruction.
+  MOZ_ASSERT(mPseudoStack->mContext);
+
+  // Unlike StreamJSObject, do not surround the samples in brackets by calling
+  // aWriter.{Start,End}BareList. The result string will be a comma-separated
+  // list of JSON object literals that will prepended by StreamJSObject into
+  // an existing array.
+  //
+  // Note that the UniqueStacks instance is persisted so that the frame-index
+  // mapping is stable across JS shutdown.
+#ifndef SPS_STANDALONE
+  mUniqueStacks.emplace(mPseudoStack->mContext);
+#else
+  mUniqueStacks.emplace(nullptr);
+#endif
+
+  {
+    SpliceableChunkedJSONWriter b;
+    b.StartBareList();
+    {
+      mBuffer->StreamSamplesToJSON(b, mThreadId, /* aSinceTime = */ 0,
+#ifndef SPS_STANDALONE
+                                   mPseudoStack->mContext,
+#else
+                                   nullptr,
+#endif
+                                   *mUniqueStacks);
+    }
+    b.EndBareList();
+    mSavedStreamedSamples = b.WriteFunc()->CopyData();
+  }
+
+  {
+    SpliceableChunkedJSONWriter b;
+    b.StartBareList();
+    {
+      mBuffer->StreamMarkersToJSON(b, mThreadId, /* aSinceTime = */ 0, *mUniqueStacks);
+    }
+    b.EndBareList();
+    mSavedStreamedMarkers = b.WriteFunc()->CopyData();
+  }
+
+  // Reset the buffer. Attempting to symbolicate JS samples after mContext has
+  // gone away will crash.
+  mBuffer->reset();
+}
+
+PseudoStack* ThreadProfile::GetPseudoStack()
+{
+  return mPseudoStack;
+}
+
+void ThreadProfile::BeginUnwind()
+{
+  mMutex->Lock();
+}
+
+void ThreadProfile::EndUnwind()
+{
+  mMutex->Unlock();
+}
+
+::Mutex& ThreadProfile::GetMutex()
+{
+  return *mMutex.get();
+}
+
+void ThreadProfile::DuplicateLastSample()
+{
+  mBuffer->DuplicateLastSample(mThreadId);
+}
+
diff --git a/tools/profiler/core/ThreadProfile.h b/tools/profiler/core/ThreadProfile.h
new file mode 100644
index 000000000..ca2bbfe7a
--- /dev/null
+++ b/tools/profiler/core/ThreadProfile.h
@@ -0,0 +1,107 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MOZ_THREAD_PROFILE_H
+#define MOZ_THREAD_PROFILE_H
+
+#include "ProfileBuffer.h"
+#include "ThreadInfo.h"
+
+class ThreadProfile
+{
+public:
+  ThreadProfile(ThreadInfo* aThreadInfo, ProfileBuffer* aBuffer);
+  virtual ~ThreadProfile();
+  void addTag(const ProfileEntry& aTag);
+
+  /**
+   * Track a marker which has been inserted into the ThreadProfile.
+   * This marker can safely be deleted once the generation has
+   * expired.
+   */
+  void addStoredMarker(ProfilerMarker *aStoredMarker);
+  PseudoStack* GetPseudoStack();
+  ::Mutex& GetMutex();
+  void StreamJSON(SpliceableJSONWriter& aWriter, double aSinceTime = 0);
+
+  /**
+   * Call this method when the JS entries inside the buffer are about to
+   * become invalid, i.e., just before JS shutdown.
+   */
+  void FlushSamplesAndMarkers();
+
+  void BeginUnwind();
+  virtual void EndUnwind();
+  virtual SyncProfile* AsSyncProfile() { return nullptr; }
+
+  bool IsMainThread() const { return mIsMainThread; }
+  const char* Name() const { return mThreadInfo->Name(); }
+  int ThreadId() const { return mThreadId; }
+
+  PlatformData* GetPlatformData() const { return mPlatformData; }
+  void* GetStackTop() const { return mStackTop; }
+  void DuplicateLastSample();
+
+  ThreadInfo* GetThreadInfo() const { return mThreadInfo; }
+#ifndef SPS_STANDALONE
+  ThreadResponsiveness* GetThreadResponsiveness() { return &mRespInfo; }
+#endif
+
+  bool CanInvokeJS() const { return mThreadInfo->CanInvokeJS(); }
+
+  void SetPendingDelete()
+  {
+    mPseudoStack = nullptr;
+    mPlatformData = nullptr;
+  }
+
+  uint32_t bufferGeneration() const {
+    return mBuffer->mGeneration;
+  }
+
+protected:
+  void StreamSamplesAndMarkers(SpliceableJSONWriter& aWriter, double aSinceTime,
+                               UniqueStacks& aUniqueStacks);
+
+private:
+  FRIEND_TEST(ThreadProfile, InsertOneTag);
+  FRIEND_TEST(ThreadProfile, InsertOneTagWithTinyBuffer);
+  FRIEND_TEST(ThreadProfile, InsertTagsNoWrap);
+  FRIEND_TEST(ThreadProfile, InsertTagsWrap);
+  FRIEND_TEST(ThreadProfile, MemoryMeasure);
+  ThreadInfo* mThreadInfo;
+
+  const RefPtr<ProfileBuffer> mBuffer;
+
+  // JS frames in the buffer may require a live JSRuntime to stream (e.g.,
+  // stringifying JIT frames). In the case of JSRuntime destruction,
+  // FlushSamplesAndMarkers should be called to save them. These are spliced
+  // into the final stream.
+  mozilla::UniquePtr<char[]> mSavedStreamedSamples;
+  mozilla::UniquePtr<char[]> mSavedStreamedMarkers;
+  mozilla::Maybe<UniqueStacks> mUniqueStacks;
+
+  PseudoStack*   mPseudoStack;
+  mozilla::UniquePtr<Mutex>  mMutex;
+  int            mThreadId;
+  bool           mIsMainThread;
+  PlatformData*  mPlatformData;  // Platform specific data.
+  void* const    mStackTop;
+#ifndef SPS_STANDALONE
+  ThreadResponsiveness mRespInfo;
+#endif
+
+  // Only Linux is using a signal sender, instead of stopping the thread, so we
+  // need some space to store the data which cannot be collected in the signal
+  // handler code.
+#ifdef XP_LINUX
+public:
+  int64_t        mRssMemory;
+  int64_t        mUssMemory;
+#endif
+};
+
+#endif
diff --git a/tools/profiler/core/platform-linux.cc b/tools/profiler/core/platform-linux.cc
new file mode 100644
index 000000000..160873c9d
--- /dev/null
+++ b/tools/profiler/core/platform-linux.cc
@@ -0,0 +1,715 @@
+// Copyright (c) 2006-2011 The Chromium Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//  * Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//  * Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in
+//    the documentation and/or other materials provided with the
+//    distribution.
+//  * Neither the name of Google, Inc. nor the names of its contributors
+//    may be used to endorse or promote products derived from this
+//    software without specific prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+// SUCH DAMAGE.
+
+/*
+# vim: sw=2
+*/
+#include <stdio.h>
+#include <math.h>
+
+#include <pthread.h>
+#include <semaphore.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/prctl.h> // set name
+#include <stdlib.h>
+#include <sched.h>
+#ifdef ANDROID
+#include <android/log.h>
+#else
+#define __android_log_print(a, ...)
+#endif
+#include <ucontext.h>
+// Ubuntu Dapper requires memory pages to be marked as
+// executable. Otherwise, OS raises an exception when executing code
+// in that page.
+#include <sys/types.h>  // mmap & munmap
+#include <sys/mman.h>   // mmap & munmap
+#include <sys/stat.h>   // open
+#include <fcntl.h>      // open
+#include <unistd.h>     // sysconf
+#include <semaphore.h>
+#ifdef __GLIBC__
+#include <execinfo.h>   // backtrace, backtrace_symbols
+#endif  // def __GLIBC__
+#include <strings.h>    // index
+#include <errno.h>
+#include <stdarg.h>
+#include "prenv.h"
+#include "platform.h"
+#include "GeckoProfiler.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/LinuxSignal.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/DebugOnly.h"
+#include "ProfileEntry.h"
+#include "nsThreadUtils.h"
+#include "GeckoSampler.h"
+#include "ThreadResponsiveness.h"
+
+#if defined(__ARM_EABI__) && defined(ANDROID)
+ // Should also work on other Android and ARM Linux, but not tested there yet.
+# define USE_EHABI_STACKWALK
+# include "EHABIStackWalk.h"
+#elif defined(SPS_PLAT_amd64_linux) || defined(SPS_PLAT_x86_linux)
+# define USE_LUL_STACKWALK
+# include "lul/LulMain.h"
+# include "lul/platform-linux-lul.h"
+#endif
+
+// Memory profile
+#include "nsMemoryReporterManager.h"
+
+#include <string.h>
+#include <list>
+
+#define SIGNAL_SAVE_PROFILE SIGUSR2
+
+using namespace mozilla;
+
+#if defined(USE_LUL_STACKWALK)
+// A singleton instance of the library.  It is initialised at first
+// use.  Currently only the main thread can call Sampler::Start, so
+// there is no need for a mechanism to ensure that it is only
+// created once in a multi-thread-use situation.
+lul::LUL* sLUL = nullptr;
+
+// This is the sLUL initialization routine.
+static void sLUL_initialization_routine(void)
+{
+  MOZ_ASSERT(!sLUL);
+  MOZ_ASSERT(gettid() == getpid()); /* "this is the main thread" */
+  sLUL = new lul::LUL(logging_sink_for_LUL);
+  // Read all the unwind info currently available.
+  read_procmaps(sLUL);
+}
+#endif
+
+/* static */ Thread::tid_t
+Thread::GetCurrentId()
+{
+  return gettid();
+}
+
+#if !defined(ANDROID)
+// Keep track of when any of our threads calls fork(), so we can
+// temporarily disable signal delivery during the fork() call.  Not
+// doing so appears to cause a kind of race, in which signals keep
+// getting delivered to the thread doing fork(), which keeps causing
+// it to fail and be restarted; hence forward progress is delayed a
+// great deal.  A side effect of this is to permanently disable
+// sampling in the child process.  See bug 837390.
+
+// Unfortunately this is only doable on non-Android, since Bionic
+// doesn't have pthread_atfork.
+
+// This records the current state at the time we paused it.
+static bool was_paused = false;
+
+// In the parent, just before the fork, record the pausedness state,
+// and then pause.
+static void paf_prepare(void) {
+  if (Sampler::GetActiveSampler()) {
+    was_paused = Sampler::GetActiveSampler()->IsPaused();
+    Sampler::GetActiveSampler()->SetPaused(true);
+  } else {
+    was_paused = false;
+  }
+}
+
+// In the parent, just after the fork, return pausedness to the
+// pre-fork state.
+static void paf_parent(void) {
+  if (Sampler::GetActiveSampler())
+    Sampler::GetActiveSampler()->SetPaused(was_paused);
+}
+
+// Set up the fork handlers.
+static void* setup_atfork() {
+  pthread_atfork(paf_prepare, paf_parent, NULL);
+  return NULL;
+}
+#endif /* !defined(ANDROID) */
+
+struct SamplerRegistry {
+  static void AddActiveSampler(Sampler *sampler) {
+    ASSERT(!SamplerRegistry::sampler);
+    SamplerRegistry::sampler = sampler;
+  }
+  static void RemoveActiveSampler(Sampler *sampler) {
+    SamplerRegistry::sampler = NULL;
+  }
+  static Sampler *sampler;
+};
+
+Sampler *SamplerRegistry::sampler = NULL;
+
+static mozilla::Atomic<ThreadProfile*> sCurrentThreadProfile;
+static sem_t sSignalHandlingDone;
+
+static void ProfilerSaveSignalHandler(int signal, siginfo_t* info, void* context) {
+  Sampler::GetActiveSampler()->RequestSave();
+}
+
+static void SetSampleContext(TickSample* sample, void* context)
+{
+  // Extracting the sample from the context is extremely machine dependent.
+  ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context);
+  mcontext_t& mcontext = ucontext->uc_mcontext;
+#if V8_HOST_ARCH_IA32
+  sample->pc = reinterpret_cast<Address>(mcontext.gregs[REG_EIP]);
+  sample->sp = reinterpret_cast<Address>(mcontext.gregs[REG_ESP]);
+  sample->fp = reinterpret_cast<Address>(mcontext.gregs[REG_EBP]);
+#elif V8_HOST_ARCH_X64
+  sample->pc = reinterpret_cast<Address>(mcontext.gregs[REG_RIP]);
+  sample->sp = reinterpret_cast<Address>(mcontext.gregs[REG_RSP]);
+  sample->fp = reinterpret_cast<Address>(mcontext.gregs[REG_RBP]);
+#elif V8_HOST_ARCH_ARM
+// An undefined macro evaluates to 0, so this applies to Android's Bionic also.
+#if !defined(ANDROID) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
+  sample->pc = reinterpret_cast<Address>(mcontext.gregs[R15]);
+  sample->sp = reinterpret_cast<Address>(mcontext.gregs[R13]);
+  sample->fp = reinterpret_cast<Address>(mcontext.gregs[R11]);
+#ifdef ENABLE_ARM_LR_SAVING
+  sample->lr = reinterpret_cast<Address>(mcontext.gregs[R14]);
+#endif
+#else
+  sample->pc = reinterpret_cast<Address>(mcontext.arm_pc);
+  sample->sp = reinterpret_cast<Address>(mcontext.arm_sp);
+  sample->fp = reinterpret_cast<Address>(mcontext.arm_fp);
+#ifdef ENABLE_ARM_LR_SAVING
+  sample->lr = reinterpret_cast<Address>(mcontext.arm_lr);
+#endif
+#endif
+#elif V8_HOST_ARCH_MIPS
+  // Implement this on MIPS.
+  UNIMPLEMENTED();
+#endif
+}
+
+#ifdef ANDROID
+#define V8_HOST_ARCH_ARM 1
+#define SYS_gettid __NR_gettid
+#define SYS_tgkill __NR_tgkill
+#else
+#define V8_HOST_ARCH_X64 1
+#endif
+
+namespace {
+
+void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) {
+  // Avoid TSan warning about clobbering errno.
+  int savedErrno = errno;
+
+  if (!Sampler::GetActiveSampler()) {
+    sem_post(&sSignalHandlingDone);
+    errno = savedErrno;
+    return;
+  }
+
+  TickSample sample_obj;
+  TickSample* sample = &sample_obj;
+  sample->context = context;
+
+  // If profiling, we extract the current pc and sp.
+  if (Sampler::GetActiveSampler()->IsProfiling()) {
+    SetSampleContext(sample, context);
+  }
+  sample->threadProfile = sCurrentThreadProfile;
+  sample->timestamp = mozilla::TimeStamp::Now();
+  sample->rssMemory = sample->threadProfile->mRssMemory;
+  sample->ussMemory = sample->threadProfile->mUssMemory;
+
+  Sampler::GetActiveSampler()->Tick(sample);
+
+  sCurrentThreadProfile = NULL;
+  sem_post(&sSignalHandlingDone);
+  errno = savedErrno;
+}
+
+} // namespace
+
+static void ProfilerSignalThread(ThreadProfile *profile,
+                                 bool isFirstProfiledThread)
+{
+  if (isFirstProfiledThread && Sampler::GetActiveSampler()->ProfileMemory()) {
+    profile->mRssMemory = nsMemoryReporterManager::ResidentFast();
+    profile->mUssMemory = nsMemoryReporterManager::ResidentUnique();
+  } else {
+    profile->mRssMemory = 0;
+    profile->mUssMemory = 0;
+  }
+}
+
+int tgkill(pid_t tgid, pid_t tid, int signalno) {
+  return syscall(SYS_tgkill, tgid, tid, signalno);
+}
+
+class PlatformData {
+ public:
+  PlatformData()
+  {
+    MOZ_COUNT_CTOR(PlatformData);
+  }
+
+  ~PlatformData()
+  {
+    MOZ_COUNT_DTOR(PlatformData);
+  }
+};
+
+/* static */ PlatformData*
+Sampler::AllocPlatformData(int aThreadId)
+{
+  return new PlatformData;
+}
+
+/* static */ void
+Sampler::FreePlatformData(PlatformData* aData)
+{
+  delete aData;
+}
+
+static void* SignalSender(void* arg) {
+  // Taken from platform_thread_posix.cc
+  prctl(PR_SET_NAME, "SamplerThread", 0, 0, 0);
+
+  int vm_tgid_ = getpid();
+  DebugOnly<int> my_tid = gettid();
+
+  unsigned int nSignalsSent = 0;
+
+  TimeDuration lastSleepOverhead = 0;
+  TimeStamp sampleStart = TimeStamp::Now();
+  while (SamplerRegistry::sampler->IsActive()) {
+
+    SamplerRegistry::sampler->HandleSaveRequest();
+    SamplerRegistry::sampler->DeleteExpiredMarkers();
+
+    if (!SamplerRegistry::sampler->IsPaused()) {
+      ::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
+      std::vector<ThreadInfo*> threads =
+        SamplerRegistry::sampler->GetRegisteredThreads();
+
+      bool isFirstProfiledThread = true;
+      for (uint32_t i = 0; i < threads.size(); i++) {
+        ThreadInfo* info = threads[i];
+
+        // This will be null if we're not interested in profiling this thread.
+        if (!info->Profile() || info->IsPendingDelete())
+          continue;
+
+        PseudoStack::SleepState sleeping = info->Stack()->observeSleeping();
+        if (sleeping == PseudoStack::SLEEPING_AGAIN) {
+          info->Profile()->DuplicateLastSample();
+          continue;
+        }
+
+        info->Profile()->GetThreadResponsiveness()->Update();
+
+        // We use sCurrentThreadProfile the ThreadProfile for the
+        // thread we're profiling to the signal handler
+        sCurrentThreadProfile = info->Profile();
+
+        int threadId = info->ThreadId();
+        MOZ_ASSERT(threadId != my_tid);
+
+        // Profile from the signal sender for information which is not signal
+        // safe, and will have low variation between the emission of the signal
+        // and the signal handler catch.
+        ProfilerSignalThread(sCurrentThreadProfile, isFirstProfiledThread);
+
+        // Profile from the signal handler for information which is signal safe
+        // and needs to be precise too, such as the stack of the interrupted
+        // thread.
+        if (tgkill(vm_tgid_, threadId, SIGPROF) != 0) {
+          printf_stderr("profiler failed to signal tid=%d\n", threadId);
+#ifdef DEBUG
+          abort();
+#else
+          continue;
+#endif
+        }
+
+        // Wait for the signal handler to run before moving on to the next one
+        sem_wait(&sSignalHandlingDone);
+        isFirstProfiledThread = false;
+
+        // The LUL unwind object accumulates frame statistics.
+        // Periodically we should poke it to give it a chance to print
+        // those statistics.  This involves doing I/O (fprintf,
+        // __android_log_print, etc) and so can't safely be done from
+        // the unwinder threads, which is why it is done here.
+        if ((++nSignalsSent & 0xF) == 0) {
+#          if defined(USE_LUL_STACKWALK)
+           sLUL->MaybeShowStats();
+#          endif
+        }
+      }
+    }
+
+    TimeStamp targetSleepEndTime = sampleStart + TimeDuration::FromMicroseconds(SamplerRegistry::sampler->interval() * 1000);
+    TimeStamp beforeSleep = TimeStamp::Now();
+    TimeDuration targetSleepDuration = targetSleepEndTime - beforeSleep;
+    double sleepTime = std::max(0.0, (targetSleepDuration - lastSleepOverhead).ToMicroseconds());
+    OS::SleepMicro(sleepTime);
+    sampleStart = TimeStamp::Now();
+    lastSleepOverhead = sampleStart - (beforeSleep + TimeDuration::FromMicroseconds(sleepTime));
+  }
+  return 0;
+}
+
+Sampler::Sampler(double interval, bool profiling, int entrySize)
+    : interval_(interval),
+      profiling_(profiling),
+      paused_(false),
+      active_(false),
+      entrySize_(entrySize) {
+  MOZ_COUNT_CTOR(Sampler);
+}
+
+Sampler::~Sampler() {
+  MOZ_COUNT_DTOR(Sampler);
+  ASSERT(!signal_sender_launched_);
+}
+
+
+void Sampler::Start() {
+  LOG("Sampler started");
+
+#if defined(USE_EHABI_STACKWALK)
+  mozilla::EHABIStackWalkInit();
+#elif defined(USE_LUL_STACKWALK)
+  // NOTE: this isn't thread-safe.  But we expect Sampler::Start to be
+  // called only from the main thread, so this is OK in general.
+  if (!sLUL) {
+     sLUL_initialization_routine();
+  }
+#endif
+
+  SamplerRegistry::AddActiveSampler(this);
+
+  // Initialize signal handler communication
+  sCurrentThreadProfile = NULL;
+  if (sem_init(&sSignalHandlingDone, /* pshared: */ 0, /* value: */ 0) != 0) {
+    LOG("Error initializing semaphore");
+    return;
+  }
+
+  // Request profiling signals.
+  LOG("Request signal");
+  struct sigaction sa;
+  sa.sa_sigaction = MOZ_SIGNAL_TRAMPOLINE(ProfilerSignalHandler);
+  sigemptyset(&sa.sa_mask);
+  sa.sa_flags = SA_RESTART | SA_SIGINFO;
+  if (sigaction(SIGPROF, &sa, &old_sigprof_signal_handler_) != 0) {
+    LOG("Error installing signal");
+    return;
+  }
+
+  // Request save profile signals
+  struct sigaction sa2;
+  sa2.sa_sigaction = ProfilerSaveSignalHandler;
+  sigemptyset(&sa2.sa_mask);
+  sa2.sa_flags = SA_RESTART | SA_SIGINFO;
+  if (sigaction(SIGNAL_SAVE_PROFILE, &sa2, &old_sigsave_signal_handler_) != 0) {
+    LOG("Error installing start signal");
+    return;
+  }
+  LOG("Signal installed");
+  signal_handler_installed_ = true;
+
+#if defined(USE_LUL_STACKWALK)
+  // Switch into unwind mode.  After this point, we can't add or
+  // remove any unwind info to/from this LUL instance.  The only thing
+  // we can do with it is Unwind() calls.
+  sLUL->EnableUnwinding();
+
+  // Has a test been requested?
+  if (PR_GetEnv("MOZ_PROFILER_LUL_TEST")) {
+     int nTests = 0, nTestsPassed = 0;
+     RunLulUnitTests(&nTests, &nTestsPassed, sLUL);
+  }
+#endif
+
+  // Start a thread that sends SIGPROF signal to VM thread.
+  // Sending the signal ourselves instead of relying on itimer provides
+  // much better accuracy.
+  SetActive(true);
+  if (pthread_create(
+        &signal_sender_thread_, NULL, SignalSender, NULL) == 0) {
+    signal_sender_launched_ = true;
+  }
+  LOG("Profiler thread started");
+}
+
+
+void Sampler::Stop() {
+  SetActive(false);
+
+  // Wait for signal sender termination (it will exit after setting
+  // active_ to false).
+  if (signal_sender_launched_) {
+    pthread_join(signal_sender_thread_, NULL);
+    signal_sender_launched_ = false;
+  }
+
+  SamplerRegistry::RemoveActiveSampler(this);
+
+  // Restore old signal handler
+  if (signal_handler_installed_) {
+    sigaction(SIGNAL_SAVE_PROFILE, &old_sigsave_signal_handler_, 0);
+    sigaction(SIGPROF, &old_sigprof_signal_handler_, 0);
+    signal_handler_installed_ = false;
+  }
+}
+
+bool Sampler::RegisterCurrentThread(const char* aName,
+                                    PseudoStack* aPseudoStack,
+                                    bool aIsMainThread, void* stackTop)
+{
+  if (!Sampler::sRegisteredThreadsMutex)
+    return false;
+
+  ::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
+
+  int id = gettid();
+  for (uint32_t i = 0; i < sRegisteredThreads->size(); i++) {
+    ThreadInfo* info = sRegisteredThreads->at(i);
+    if (info->ThreadId() == id && !info->IsPendingDelete()) {
+      // Thread already registered. This means the first unregister will be
+      // too early.
+      ASSERT(false);
+      return false;
+    }
+  }
+
+  set_tls_stack_top(stackTop);
+
+  ThreadInfo* info = new StackOwningThreadInfo(aName, id,
+    aIsMainThread, aPseudoStack, stackTop);
+
+  if (sActiveSampler) {
+    sActiveSampler->RegisterThread(info);
+  }
+
+  sRegisteredThreads->push_back(info);
+
+  return true;
+}
+
+void Sampler::UnregisterCurrentThread()
+{
+  if (!Sampler::sRegisteredThreadsMutex)
+    return;
+
+  tlsStackTop.set(nullptr);
+
+  ::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
+
+  int id = gettid();
+
+  for (uint32_t i = 0; i < sRegisteredThreads->size(); i++) {
+    ThreadInfo* info = sRegisteredThreads->at(i);
+    if (info->ThreadId() == id && !info->IsPendingDelete()) {
+      if (profiler_is_active()) {
+        // We still want to show the results of this thread if you
+        // save the profile shortly after a thread is terminated.
+        // For now we will defer the delete to profile stop.
+        info->SetPendingDelete();
+        break;
+      } else {
+        delete info;
+        sRegisteredThreads->erase(sRegisteredThreads->begin() + i);
+        break;
+      }
+    }
+  }
+}
+
+#ifdef ANDROID
+static struct sigaction old_sigstart_signal_handler;
+const int SIGSTART = SIGUSR2;
+
+static void freeArray(const char** array, int size) {
+  for (int i = 0; i < size; i++) {
+    free((void*) array[i]);
+  }
+}
+
+static uint32_t readCSVArray(char* csvList, const char** buffer) {
+  uint32_t count;
+  char* savePtr;
+  int newlinePos = strlen(csvList) - 1;
+  if (csvList[newlinePos] == '\n') {
+    csvList[newlinePos] = '\0';
+  }
+
+  char* item = strtok_r(csvList, ",", &savePtr);
+  for (count = 0; item; item = strtok_r(NULL, ",", &savePtr)) {
+    int length = strlen(item) + 1;  // Include \0
+    char* newBuf = (char*) malloc(sizeof(char) * length);
+    buffer[count] = newBuf;
+    strncpy(newBuf, item, length);
+    count++;
+  }
+
+  return count;
+}
+
+// Currently support only the env variables
+// reported in read_profiler_env
+static void ReadProfilerVars(const char* fileName, const char** features,
+                            uint32_t* featureCount, const char** threadNames, uint32_t* threadCount) {
+  FILE* file = fopen(fileName, "r");
+  const int bufferSize = 1024;
+  char line[bufferSize];
+  char* feature;
+  char* value;
+  char* savePtr;
+
+  if (file) {
+    while (fgets(line, bufferSize, file) != NULL) {
+      feature = strtok_r(line, "=", &savePtr);
+      value = strtok_r(NULL, "", &savePtr);
+
+      if (strncmp(feature, PROFILER_INTERVAL, bufferSize) == 0) {
+        set_profiler_interval(value);
+      } else if (strncmp(feature, PROFILER_ENTRIES, bufferSize) == 0) {
+        set_profiler_entries(value);
+      } else if (strncmp(feature, PROFILER_STACK, bufferSize) == 0) {
+        set_profiler_scan(value);
+      } else if (strncmp(feature, PROFILER_FEATURES, bufferSize) == 0) {
+        *featureCount = readCSVArray(value, features);
+      } else if (strncmp(feature, "threads", bufferSize) == 0) {
+        *threadCount = readCSVArray(value, threadNames);
+      }
+    }
+
+    fclose(file);
+  }
+}
+
+static void DoStartTask() {
+  uint32_t featureCount = 0;
+  uint32_t threadCount = 0;
+
+  // Just allocate 10 features for now
+  // FIXME: these don't really point to const chars*
+  // So we free them later, but we don't want to change the const char**
+  // declaration in profiler_start. Annoying but ok for now.
+  const char* threadNames[10];
+  const char* features[10];
+  const char* profilerConfigFile = "/data/local/tmp/profiler.options";
+
+  ReadProfilerVars(profilerConfigFile, features, &featureCount, threadNames, &threadCount);
+  MOZ_ASSERT(featureCount < 10);
+  MOZ_ASSERT(threadCount < 10);
+
+  profiler_start(PROFILE_DEFAULT_ENTRY, 1,
+      features, featureCount,
+      threadNames, threadCount);
+
+  freeArray(threadNames, threadCount);
+  freeArray(features, featureCount);
+}
+
+static void StartSignalHandler(int signal, siginfo_t* info, void* context) {
+  class StartTask : public Runnable {
+  public:
+    NS_IMETHOD Run() override {
+      DoStartTask();
+      return NS_OK;
+    }
+  };
+  // XXX: technically NS_DispatchToMainThread is NOT async signal safe. We risk
+  // nasty things like deadlocks, but the probability is very low and we
+  // typically only do this once so it tends to be ok. See bug 909403.
+  NS_DispatchToMainThread(new StartTask());
+}
+
+void OS::Startup()
+{
+  LOG("Registering start signal");
+  struct sigaction sa;
+  sa.sa_sigaction = StartSignalHandler;
+  sigemptyset(&sa.sa_mask);
+  sa.sa_flags = SA_RESTART | SA_SIGINFO;
+  if (sigaction(SIGSTART, &sa, &old_sigstart_signal_handler) != 0) {
+    LOG("Error installing signal");
+  }
+}
+
+#else
+
+void OS::Startup() {
+  // Set up the fork handlers.
+  setup_atfork();
+}
+
+#endif
+
+
+
+void TickSample::PopulateContext(void* aContext)
+{
+  MOZ_ASSERT(aContext);
+  ucontext_t* pContext = reinterpret_cast<ucontext_t*>(aContext);
+  if (!getcontext(pContext)) {
+    context = pContext;
+    SetSampleContext(this, aContext);
+  }
+}
+
+void OS::SleepMicro(int microseconds)
+{
+  if (MOZ_UNLIKELY(microseconds >= 1000000)) {
+    // Use usleep for larger intervals, because the nanosleep
+    // code below only supports intervals < 1 second.
+    MOZ_ALWAYS_TRUE(!::usleep(microseconds));
+    return;
+  }
+
+  struct timespec ts;
+  ts.tv_sec  = 0;
+  ts.tv_nsec = microseconds * 1000UL;
+
+  int rv = ::nanosleep(&ts, &ts);
+
+  while (rv != 0 && errno == EINTR) {
+    // Keep waiting in case of interrupt.
+    // nanosleep puts the remaining time back into ts.
+    rv = ::nanosleep(&ts, &ts);
+  }
+
+  MOZ_ASSERT(!rv, "nanosleep call failed");
+}
diff --git a/tools/profiler/core/platform-macos.cc b/tools/profiler/core/platform-macos.cc
new file mode 100644
index 000000000..9a98d1a26
--- /dev/null
+++ b/tools/profiler/core/platform-macos.cc
@@ -0,0 +1,469 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <dlfcn.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <mach/mach_init.h>
+#include <mach-o/dyld.h>
+#include <mach-o/getsect.h>
+
+#include <AvailabilityMacros.h>
+
+#include <pthread.h>
+#include <semaphore.h>
+#include <signal.h>
+#include <libkern/OSAtomic.h>
+#include <mach/mach.h>
+#include <mach/semaphore.h>
+#include <mach/task.h>
+#include <mach/vm_statistics.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <math.h>
+
+#ifndef SPS_STANDALONE
+#include "ThreadResponsiveness.h"
+#include "nsThreadUtils.h"
+
+// Memory profile
+#include "nsMemoryReporterManager.h"
+#endif
+
+#include "platform.h"
+#include "GeckoSampler.h"
+#include "mozilla/TimeStamp.h"
+
+using mozilla::TimeStamp;
+using mozilla::TimeDuration;
+
+// this port is based off of v8 svn revision 9837
+
+// XXX: this is a very stubbed out implementation
+// that only supports a single Sampler
+struct SamplerRegistry {
+  static void AddActiveSampler(Sampler *sampler) {
+    ASSERT(!SamplerRegistry::sampler);
+    SamplerRegistry::sampler = sampler;
+  }
+  static void RemoveActiveSampler(Sampler *sampler) {
+    SamplerRegistry::sampler = NULL;
+  }
+  static Sampler *sampler;
+};
+
+Sampler *SamplerRegistry::sampler = NULL;
+
+#ifdef DEBUG
+// 0 is never a valid thread id on MacOSX since a pthread_t is a pointer.
+static const pthread_t kNoThread = (pthread_t) 0;
+#endif
+
+void OS::Startup() {
+}
+
+void OS::Sleep(int milliseconds) {
+  usleep(1000 * milliseconds);
+}
+
+void OS::SleepMicro(int microseconds) {
+  usleep(microseconds);
+}
+
+Thread::Thread(const char* name)
+    : stack_size_(0) {
+  set_name(name);
+}
+
+
+Thread::~Thread() {
+}
+
+
+static void SetThreadName(const char* name) {
+  // pthread_setname_np is only available in 10.6 or later, so test
+  // for it at runtime.
+  int (*dynamic_pthread_setname_np)(const char*);
+  *reinterpret_cast<void**>(&dynamic_pthread_setname_np) =
+    dlsym(RTLD_DEFAULT, "pthread_setname_np");
+  if (!dynamic_pthread_setname_np)
+    return;
+
+  // Mac OS X does not expose the length limit of the name, so hardcode it.
+  static const int kMaxNameLength = 63;
+  USE(kMaxNameLength);
+  ASSERT(Thread::kMaxThreadNameLength <= kMaxNameLength);
+  dynamic_pthread_setname_np(name);
+}
+
+
+static void* ThreadEntry(void* arg) {
+  Thread* thread = reinterpret_cast<Thread*>(arg);
+
+  thread->thread_ = pthread_self();
+  SetThreadName(thread->name());
+  ASSERT(thread->thread_ != kNoThread);
+  thread->Run();
+  return NULL;
+}
+
+
+void Thread::set_name(const char* name) {
+  strncpy(name_, name, sizeof(name_));
+  name_[sizeof(name_) - 1] = '\0';
+}
+
+
+void Thread::Start() {
+  pthread_attr_t* attr_ptr = NULL;
+  pthread_attr_t attr;
+  if (stack_size_ > 0) {
+    pthread_attr_init(&attr);
+    pthread_attr_setstacksize(&attr, static_cast<size_t>(stack_size_));
+    attr_ptr = &attr;
+  }
+  pthread_create(&thread_, attr_ptr, ThreadEntry, this);
+  ASSERT(thread_ != kNoThread);
+}
+
+void Thread::Join() {
+  pthread_join(thread_, NULL);
+}
+
+class PlatformData {
+ public:
+  PlatformData() : profiled_thread_(mach_thread_self())
+  {
+    profiled_pthread_ = pthread_from_mach_thread_np(profiled_thread_);
+  }
+
+  ~PlatformData() {
+    // Deallocate Mach port for thread.
+    mach_port_deallocate(mach_task_self(), profiled_thread_);
+  }
+
+  thread_act_t profiled_thread() { return profiled_thread_; }
+  pthread_t profiled_pthread() { return profiled_pthread_; }
+
+ private:
+  // Note: for profiled_thread_ Mach primitives are used instead of PThread's
+  // because the latter doesn't provide thread manipulation primitives required.
+  // For details, consult "Mac OS X Internals" book, Section 7.3.
+  thread_act_t profiled_thread_;
+  // we also store the pthread because Mach threads have no concept of stack
+  // and we want to be able to get the stack size when we need to unwind the
+  // stack using frame pointers.
+  pthread_t profiled_pthread_;
+};
+
+/* static */ PlatformData*
+Sampler::AllocPlatformData(int aThreadId)
+{
+  return new PlatformData;
+}
+
+/* static */ void
+Sampler::FreePlatformData(PlatformData* aData)
+{
+  delete aData;
+}
+
+class SamplerThread : public Thread {
+ public:
+  explicit SamplerThread(double interval)
+      : Thread("SamplerThread")
+      , intervalMicro_(floor(interval * 1000 + 0.5))
+  {
+    if (intervalMicro_ <= 0) {
+      intervalMicro_ = 1;
+    }
+  }
+
+  static void AddActiveSampler(Sampler* sampler) {
+    SamplerRegistry::AddActiveSampler(sampler);
+    if (instance_ == NULL) {
+      instance_ = new SamplerThread(sampler->interval());
+      instance_->Start();
+    }
+  }
+
+  static void RemoveActiveSampler(Sampler* sampler) {
+    instance_->Join();
+    //XXX: unlike v8 we need to remove the active sampler after doing the Join
+    // because we drop the sampler immediately
+    SamplerRegistry::RemoveActiveSampler(sampler);
+    delete instance_;
+    instance_ = NULL;
+  }
+
+  // Implement Thread::Run().
+  virtual void Run() {
+    TimeDuration lastSleepOverhead = 0;
+    TimeStamp sampleStart = TimeStamp::Now();
+    while (SamplerRegistry::sampler->IsActive()) {
+      SamplerRegistry::sampler->DeleteExpiredMarkers();
+      if (!SamplerRegistry::sampler->IsPaused()) {
+        ::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
+        std::vector<ThreadInfo*> threads =
+          SamplerRegistry::sampler->GetRegisteredThreads();
+        bool isFirstProfiledThread = true;
+        for (uint32_t i = 0; i < threads.size(); i++) {
+          ThreadInfo* info = threads[i];
+
+          // This will be null if we're not interested in profiling this thread.
+          if (!info->Profile() || info->IsPendingDelete())
+            continue;
+
+          PseudoStack::SleepState sleeping = info->Stack()->observeSleeping();
+          if (sleeping == PseudoStack::SLEEPING_AGAIN) {
+            info->Profile()->DuplicateLastSample();
+            continue;
+          }
+
+#ifndef SPS_STANDALONE
+          info->Profile()->GetThreadResponsiveness()->Update();
+#endif
+
+          ThreadProfile* thread_profile = info->Profile();
+
+          SampleContext(SamplerRegistry::sampler, thread_profile,
+                        isFirstProfiledThread);
+          isFirstProfiledThread = false;
+        }
+      }
+
+      TimeStamp targetSleepEndTime = sampleStart + TimeDuration::FromMicroseconds(intervalMicro_);
+      TimeStamp beforeSleep = TimeStamp::Now();
+      TimeDuration targetSleepDuration = targetSleepEndTime - beforeSleep;
+      double sleepTime = std::max(0.0, (targetSleepDuration - lastSleepOverhead).ToMicroseconds());
+      OS::SleepMicro(sleepTime);
+      sampleStart = TimeStamp::Now();
+      lastSleepOverhead = sampleStart - (beforeSleep + TimeDuration::FromMicroseconds(sleepTime));
+    }
+  }
+
+  void SampleContext(Sampler* sampler, ThreadProfile* thread_profile,
+                     bool isFirstProfiledThread)
+  {
+    thread_act_t profiled_thread =
+      thread_profile->GetPlatformData()->profiled_thread();
+
+    TickSample sample_obj;
+    TickSample* sample = &sample_obj;
+
+    // Unique Set Size is not supported on Mac.
+    sample->ussMemory = 0;
+    sample->rssMemory = 0;
+
+#ifndef SPS_STANDALONE
+    if (isFirstProfiledThread && Sampler::GetActiveSampler()->ProfileMemory()) {
+      sample->rssMemory = nsMemoryReporterManager::ResidentFast();
+    }
+#endif
+
+    // We're using thread_suspend on OS X because pthread_kill (which is what
+    // we're using on Linux) has less consistent performance and causes
+    // strange crashes, see bug 1166778 and bug 1166808.
+
+    if (KERN_SUCCESS != thread_suspend(profiled_thread)) return;
+
+#if V8_HOST_ARCH_X64
+    thread_state_flavor_t flavor = x86_THREAD_STATE64;
+    x86_thread_state64_t state;
+    mach_msg_type_number_t count = x86_THREAD_STATE64_COUNT;
+#if __DARWIN_UNIX03
+#define REGISTER_FIELD(name) __r ## name
+#else
+#define REGISTER_FIELD(name) r ## name
+#endif  // __DARWIN_UNIX03
+#elif V8_HOST_ARCH_IA32
+    thread_state_flavor_t flavor = i386_THREAD_STATE;
+    i386_thread_state_t state;
+    mach_msg_type_number_t count = i386_THREAD_STATE_COUNT;
+#if __DARWIN_UNIX03
+#define REGISTER_FIELD(name) __e ## name
+#else
+#define REGISTER_FIELD(name) e ## name
+#endif  // __DARWIN_UNIX03
+#else
+#error Unsupported Mac OS X host architecture.
+#endif  // V8_HOST_ARCH
+
+    if (thread_get_state(profiled_thread,
+                         flavor,
+                         reinterpret_cast<natural_t*>(&state),
+                         &count) == KERN_SUCCESS) {
+      sample->pc = reinterpret_cast<Address>(state.REGISTER_FIELD(ip));
+      sample->sp = reinterpret_cast<Address>(state.REGISTER_FIELD(sp));
+      sample->fp = reinterpret_cast<Address>(state.REGISTER_FIELD(bp));
+      sample->timestamp = mozilla::TimeStamp::Now();
+      sample->threadProfile = thread_profile;
+
+      sampler->Tick(sample);
+    }
+    thread_resume(profiled_thread);
+  }
+
+  int intervalMicro_;
+  //RuntimeProfilerRateLimiter rate_limiter_;
+
+  static SamplerThread* instance_;
+
+  DISALLOW_COPY_AND_ASSIGN(SamplerThread);
+};
+
+#undef REGISTER_FIELD
+
+SamplerThread* SamplerThread::instance_ = NULL;
+
+Sampler::Sampler(double interval, bool profiling, int entrySize)
+    : // isolate_(isolate),
+      interval_(interval),
+      profiling_(profiling),
+      paused_(false),
+      active_(false),
+      entrySize_(entrySize) /*,
+      samples_taken_(0)*/ {
+}
+
+
+Sampler::~Sampler() {
+  ASSERT(!IsActive());
+}
+
+
+void Sampler::Start() {
+  ASSERT(!IsActive());
+  SetActive(true);
+  SamplerThread::AddActiveSampler(this);
+}
+
+
+void Sampler::Stop() {
+  ASSERT(IsActive());
+  SetActive(false);
+  SamplerThread::RemoveActiveSampler(this);
+}
+
+pthread_t
+Sampler::GetProfiledThread(PlatformData* aData)
+{
+  return aData->profiled_pthread();
+}
+
+#include <sys/syscall.h>
+pid_t gettid()
+{
+  return (pid_t) syscall(SYS_thread_selfid);
+}
+
+/* static */ Thread::tid_t
+Thread::GetCurrentId()
+{
+  return gettid();
+}
+
+bool Sampler::RegisterCurrentThread(const char* aName,
+                                    PseudoStack* aPseudoStack,
+                                    bool aIsMainThread, void* stackTop)
+{
+  if (!Sampler::sRegisteredThreadsMutex)
+    return false;
+
+
+  ::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
+
+  int id = gettid();
+  for (uint32_t i = 0; i < sRegisteredThreads->size(); i++) {
+    ThreadInfo* info = sRegisteredThreads->at(i);
+    if (info->ThreadId() == id && !info->IsPendingDelete()) {
+      // Thread already registered. This means the first unregister will be
+      // too early.
+      ASSERT(false);
+      return false;
+    }
+  }
+
+  set_tls_stack_top(stackTop);
+
+  ThreadInfo* info = new StackOwningThreadInfo(aName, id,
+    aIsMainThread, aPseudoStack, stackTop);
+
+  if (sActiveSampler) {
+    sActiveSampler->RegisterThread(info);
+  }
+
+  sRegisteredThreads->push_back(info);
+
+  return true;
+}
+
+void Sampler::UnregisterCurrentThread()
+{
+  if (!Sampler::sRegisteredThreadsMutex)
+    return;
+
+  tlsStackTop.set(nullptr);
+
+  ::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
+
+  int id = gettid();
+
+  for (uint32_t i = 0; i < sRegisteredThreads->size(); i++) {
+    ThreadInfo* info = sRegisteredThreads->at(i);
+    if (info->ThreadId() == id && !info->IsPendingDelete()) {
+      if (profiler_is_active()) {
+        // We still want to show the results of this thread if you
+        // save the profile shortly after a thread is terminated.
+        // For now we will defer the delete to profile stop.
+        info->SetPendingDelete();
+        break;
+      } else {
+        delete info;
+        sRegisteredThreads->erase(sRegisteredThreads->begin() + i);
+        break;
+      }
+    }
+  }
+}
+
+void TickSample::PopulateContext(void* aContext)
+{
+  // Note that this asm changes if PopulateContext's parameter list is altered
+#if defined(SPS_PLAT_amd64_darwin)
+  asm (
+      // Compute caller's %rsp by adding to %rbp:
+      // 8 bytes for previous %rbp, 8 bytes for return address
+      "leaq 0x10(%%rbp), %0\n\t"
+      // Dereference %rbp to get previous %rbp
+      "movq (%%rbp), %1\n\t"
+      :
+      "=r"(sp),
+      "=r"(fp)
+  );
+#elif defined(SPS_PLAT_x86_darwin)
+  asm (
+      // Compute caller's %esp by adding to %ebp:
+      // 4 bytes for aContext + 4 bytes for return address +
+      // 4 bytes for previous %ebp
+      "leal 0xc(%%ebp), %0\n\t"
+      // Dereference %ebp to get previous %ebp
+      "movl (%%ebp), %1\n\t"
+      :
+      "=r"(sp),
+      "=r"(fp)
+  );
+#else
+# error "Unsupported architecture"
+#endif
+  pc = reinterpret_cast<Address>(__builtin_extract_return_addr(
+                                    __builtin_return_address(0)));
+}
+
diff --git a/tools/profiler/core/platform-win32.cc b/tools/profiler/core/platform-win32.cc
new file mode 100644
index 000000000..74b311f28
--- /dev/null
+++ b/tools/profiler/core/platform-win32.cc
@@ -0,0 +1,431 @@
+// Copyright (c) 2006-2011 The Chromium Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//  * Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//  * Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in
+//    the documentation and/or other materials provided with the
+//    distribution.
+//  * Neither the name of Google, Inc. nor the names of its contributors
+//    may be used to endorse or promote products derived from this
+//    software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+// SUCH DAMAGE.
+
+#include <windows.h>
+#include <mmsystem.h>
+#include <process.h>
+#include "platform.h"
+#include "GeckoSampler.h"
+#include "ThreadResponsiveness.h"
+#include "ProfileEntry.h"
+
+// Memory profile
+#include "nsMemoryReporterManager.h"
+
+#include "mozilla/StackWalk_windows.h"
+
+
+class PlatformData {
+ public:
+  // Get a handle to the calling thread. This is the thread that we are
+  // going to profile. We need to make a copy of the handle because we are
+  // going to use it in the sampler thread. Using GetThreadHandle() will
+  // not work in this case. We're using OpenThread because DuplicateHandle
+  // for some reason doesn't work in Chrome's sandbox.
+  PlatformData(int aThreadId) : profiled_thread_(OpenThread(THREAD_GET_CONTEXT |
+                                               THREAD_SUSPEND_RESUME |
+                                               THREAD_QUERY_INFORMATION,
+                                               false,
+                                               aThreadId)) {}
+
+  ~PlatformData() {
+    if (profiled_thread_ != NULL) {
+      CloseHandle(profiled_thread_);
+      profiled_thread_ = NULL;
+    }
+  }
+
+  HANDLE profiled_thread() { return profiled_thread_; }
+
+ private:
+  HANDLE profiled_thread_;
+};
+
+/* static */ PlatformData*
+Sampler::AllocPlatformData(int aThreadId)
+{
+  return new PlatformData(aThreadId);
+}
+
+/* static */ void
+Sampler::FreePlatformData(PlatformData* aData)
+{
+  delete aData;
+}
+
+uintptr_t
+Sampler::GetThreadHandle(PlatformData* aData)
+{
+  return (uintptr_t) aData->profiled_thread();
+}
+
+class SamplerThread : public Thread {
+ public:
+  SamplerThread(double interval, Sampler* sampler)
+      : Thread("SamplerThread")
+      , sampler_(sampler)
+      , interval_(interval)
+  {
+    interval_ = floor(interval + 0.5);
+    if (interval_ <= 0) {
+      interval_ = 1;
+    }
+  }
+
+  static void StartSampler(Sampler* sampler) {
+    if (instance_ == NULL) {
+      instance_ = new SamplerThread(sampler->interval(), sampler);
+      instance_->Start();
+    } else {
+      ASSERT(instance_->interval_ == sampler->interval());
+    }
+  }
+
+  static void StopSampler() {
+    instance_->Join();
+    delete instance_;
+    instance_ = NULL;
+  }
+
+  // Implement Thread::Run().
+  virtual void Run() {
+
+    // By default we'll not adjust the timer resolution which tends to be around
+    // 16ms. However, if the requested interval is sufficiently low we'll try to
+    // adjust the resolution to match.
+    if (interval_ < 10)
+        ::timeBeginPeriod(interval_);
+
+    while (sampler_->IsActive()) {
+      sampler_->DeleteExpiredMarkers();
+
+      if (!sampler_->IsPaused()) {
+        ::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
+        std::vector<ThreadInfo*> threads =
+          sampler_->GetRegisteredThreads();
+        bool isFirstProfiledThread = true;
+        for (uint32_t i = 0; i < threads.size(); i++) {
+          ThreadInfo* info = threads[i];
+
+          // This will be null if we're not interested in profiling this thread.
+          if (!info->Profile() || info->IsPendingDelete())
+            continue;
+
+          PseudoStack::SleepState sleeping = info->Stack()->observeSleeping();
+          if (sleeping == PseudoStack::SLEEPING_AGAIN) {
+            info->Profile()->DuplicateLastSample();
+            continue;
+          }
+
+          info->Profile()->GetThreadResponsiveness()->Update();
+
+          ThreadProfile* thread_profile = info->Profile();
+
+          SampleContext(sampler_, thread_profile, isFirstProfiledThread);
+          isFirstProfiledThread = false;
+        }
+      }
+      OS::Sleep(interval_);
+    }
+
+    // disable any timer resolution changes we've made
+    if (interval_ < 10)
+        ::timeEndPeriod(interval_);
+  }
+
+  void SampleContext(Sampler* sampler, ThreadProfile* thread_profile,
+                     bool isFirstProfiledThread)
+  {
+    uintptr_t thread = Sampler::GetThreadHandle(
+                               thread_profile->GetPlatformData());
+    HANDLE profiled_thread = reinterpret_cast<HANDLE>(thread);
+    if (profiled_thread == NULL)
+      return;
+
+    // Context used for sampling the register state of the profiled thread.
+    CONTEXT context;
+    memset(&context, 0, sizeof(context));
+
+    TickSample sample_obj;
+    TickSample* sample = &sample_obj;
+
+    // Grab the timestamp before pausing the thread, to avoid deadlocks.
+    sample->timestamp = mozilla::TimeStamp::Now();
+    sample->threadProfile = thread_profile;
+
+    if (isFirstProfiledThread && Sampler::GetActiveSampler()->ProfileMemory()) {
+      sample->rssMemory = nsMemoryReporterManager::ResidentFast();
+    } else {
+      sample->rssMemory = 0;
+    }
+
+    // Unique Set Size is not supported on Windows.
+    sample->ussMemory = 0;
+
+    static const DWORD kSuspendFailed = static_cast<DWORD>(-1);
+    if (SuspendThread(profiled_thread) == kSuspendFailed)
+      return;
+
+    // SuspendThread is asynchronous, so the thread may still be running.
+    // Call GetThreadContext first to ensure the thread is really suspended.
+    // See https://blogs.msdn.microsoft.com/oldnewthing/20150205-00/?p=44743.
+
+    // Using only CONTEXT_CONTROL is faster but on 64-bit it causes crashes in
+    // RtlVirtualUnwind (see bug 1120126) so we set all the flags.
+#if V8_HOST_ARCH_X64
+    context.ContextFlags = CONTEXT_FULL;
+#else
+    context.ContextFlags = CONTEXT_CONTROL;
+#endif
+    if (!GetThreadContext(profiled_thread, &context)) {
+      ResumeThread(profiled_thread);
+      return;
+    }
+
+    // Threads that may invoke JS require extra attention. Since, on windows,
+    // the jits also need to modify the same dynamic function table that we need
+    // to get a stack trace, we have to be wary of that to avoid deadlock.
+    //
+    // When embedded in Gecko, for threads that aren't the main thread,
+    // CanInvokeJS consults an unlocked value in the nsIThread, so we must
+    // consult this after suspending the profiled thread to avoid racing
+    // against a value change.
+    if (thread_profile->CanInvokeJS()) {
+      if (!TryAcquireStackWalkWorkaroundLock()) {
+        ResumeThread(profiled_thread);
+        return;
+      }
+
+      // It is safe to immediately drop the lock. We only need to contend with
+      // the case in which the profiled thread held needed system resources.
+      // If the profiled thread had held those resources, the trylock would have
+      // failed. Anyone else who grabs those resources will continue to make
+      // progress, since those threads are not suspended. Because of this,
+      // we cannot deadlock with them, and should let them run as they please.
+      ReleaseStackWalkWorkaroundLock();
+    }
+
+#if V8_HOST_ARCH_X64
+    sample->pc = reinterpret_cast<Address>(context.Rip);
+    sample->sp = reinterpret_cast<Address>(context.Rsp);
+    sample->fp = reinterpret_cast<Address>(context.Rbp);
+#else
+    sample->pc = reinterpret_cast<Address>(context.Eip);
+    sample->sp = reinterpret_cast<Address>(context.Esp);
+    sample->fp = reinterpret_cast<Address>(context.Ebp);
+#endif
+
+    sample->context = &context;
+    sampler->Tick(sample);
+
+    ResumeThread(profiled_thread);
+  }
+
+  Sampler* sampler_;
+  int interval_; // units: ms
+
+  // Protects the process wide state below.
+  static SamplerThread* instance_;
+
+  DISALLOW_COPY_AND_ASSIGN(SamplerThread);
+};
+
+SamplerThread* SamplerThread::instance_ = NULL;
+
+
+Sampler::Sampler(double interval, bool profiling, int entrySize)
+    : interval_(interval),
+      profiling_(profiling),
+      paused_(false),
+      active_(false),
+      entrySize_(entrySize) {
+}
+
+Sampler::~Sampler() {
+  ASSERT(!IsActive());
+}
+
+void Sampler::Start() {
+  ASSERT(!IsActive());
+  SetActive(true);
+  SamplerThread::StartSampler(this);
+}
+
+void Sampler::Stop() {
+  ASSERT(IsActive());
+  SetActive(false);
+  SamplerThread::StopSampler();
+}
+
+
+static const HANDLE kNoThread = INVALID_HANDLE_VALUE;
+
+static unsigned int __stdcall ThreadEntry(void* arg) {
+  Thread* thread = reinterpret_cast<Thread*>(arg);
+  thread->Run();
+  return 0;
+}
+
+// Initialize a Win32 thread object. The thread has an invalid thread
+// handle until it is started.
+Thread::Thread(const char* name)
+    : stack_size_(0) {
+  thread_ = kNoThread;
+  set_name(name);
+}
+
+void Thread::set_name(const char* name) {
+  strncpy(name_, name, sizeof(name_));
+  name_[sizeof(name_) - 1] = '\0';
+}
+
+// Close our own handle for the thread.
+Thread::~Thread() {
+  if (thread_ != kNoThread) CloseHandle(thread_);
+}
+
+// Create a new thread. It is important to use _beginthreadex() instead of
+// the Win32 function CreateThread(), because the CreateThread() does not
+// initialize thread specific structures in the C runtime library.
+void Thread::Start() {
+  thread_ = reinterpret_cast<HANDLE>(
+      _beginthreadex(NULL,
+                     static_cast<unsigned>(stack_size_),
+                     ThreadEntry,
+                     this,
+                     0,
+                     (unsigned int*) &thread_id_));
+}
+
+// Wait for thread to terminate.
+void Thread::Join() {
+  if (thread_id_ != GetCurrentId()) {
+    WaitForSingleObject(thread_, INFINITE);
+  }
+}
+
+/* static */ Thread::tid_t
+Thread::GetCurrentId()
+{
+  return GetCurrentThreadId();
+}
+
+void OS::Startup() {
+}
+
+void OS::Sleep(int milliseconds) {
+  ::Sleep(milliseconds);
+}
+
+bool Sampler::RegisterCurrentThread(const char* aName,
+                                    PseudoStack* aPseudoStack,
+                                    bool aIsMainThread, void* stackTop)
+{
+  if (!Sampler::sRegisteredThreadsMutex)
+    return false;
+
+
+  ::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
+
+  int id = GetCurrentThreadId();
+
+  for (uint32_t i = 0; i < sRegisteredThreads->size(); i++) {
+    ThreadInfo* info = sRegisteredThreads->at(i);
+    if (info->ThreadId() == id && !info->IsPendingDelete()) {
+      // Thread already registered. This means the first unregister will be
+      // too early.
+      ASSERT(false);
+      return false;
+    }
+  }
+
+  set_tls_stack_top(stackTop);
+
+  ThreadInfo* info = new StackOwningThreadInfo(aName, id,
+    aIsMainThread, aPseudoStack, stackTop);
+
+  if (sActiveSampler) {
+    sActiveSampler->RegisterThread(info);
+  }
+
+  sRegisteredThreads->push_back(info);
+
+  return true;
+}
+
+void Sampler::UnregisterCurrentThread()
+{
+  if (!Sampler::sRegisteredThreadsMutex)
+    return;
+
+  tlsStackTop.set(nullptr);
+
+  ::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
+
+  int id = GetCurrentThreadId();
+
+  for (uint32_t i = 0; i < sRegisteredThreads->size(); i++) {
+    ThreadInfo* info = sRegisteredThreads->at(i);
+    if (info->ThreadId() == id && !info->IsPendingDelete()) {
+      if (profiler_is_active()) {
+        // We still want to show the results of this thread if you
+        // save the profile shortly after a thread is terminated.
+        // For now we will defer the delete to profile stop.
+        info->SetPendingDelete();
+        break;
+      } else {
+        delete info;
+        sRegisteredThreads->erase(sRegisteredThreads->begin() + i);
+        break;
+      }
+    }
+  }
+}
+
+void TickSample::PopulateContext(void* aContext)
+{
+  MOZ_ASSERT(aContext);
+  CONTEXT* pContext = reinterpret_cast<CONTEXT*>(aContext);
+  context = pContext;
+  RtlCaptureContext(pContext);
+
+#if defined(SPS_PLAT_amd64_windows)
+
+  pc = reinterpret_cast<Address>(pContext->Rip);
+  sp = reinterpret_cast<Address>(pContext->Rsp);
+  fp = reinterpret_cast<Address>(pContext->Rbp);
+
+#elif defined(SPS_PLAT_x86_windows)
+
+  pc = reinterpret_cast<Address>(pContext->Eip);
+  sp = reinterpret_cast<Address>(pContext->Esp);
+  fp = reinterpret_cast<Address>(pContext->Ebp);
+
+#endif
+}
+
diff --git a/tools/profiler/core/platform.cpp b/tools/profiler/core/platform.cpp
new file mode 100644
index 000000000..0d3cb1648
--- /dev/null
+++ b/tools/profiler/core/platform.cpp
@@ -0,0 +1,1266 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <ostream>
+#include <fstream>
+#include <sstream>
+#include <errno.h>
+
+#include "platform.h"
+#include "PlatformMacros.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/UniquePtr.h"
+#include "GeckoProfiler.h"
+#ifndef SPS_STANDALONE
+#include "ProfilerIOInterposeObserver.h"
+#include "mozilla/StaticPtr.h"
+#endif
+#include "mozilla/ThreadLocal.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/Sprintf.h"
+#include "PseudoStack.h"
+#include "GeckoSampler.h"
+#ifndef SPS_STANDALONE
+#include "nsIObserverService.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsXULAppAPI.h"
+#include "nsProfilerStartParams.h"
+#include "mozilla/Services.h"
+#include "nsThreadUtils.h"
+#endif
+#include "ProfilerMarkers.h"
+
+#ifdef MOZ_TASK_TRACER
+#include "GeckoTaskTracer.h"
+#endif
+
+#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
+  #include "FennecJNIWrappers.h"
+#endif
+
+#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
+#include "FennecJNINatives.h"
+#endif
+
+#ifndef SPS_STANDALONE
+#if defined(SPS_PLAT_amd64_linux) || defined(SPS_PLAT_x86_linux)
+# define USE_LUL_STACKWALK
+# include "lul/LulMain.h"
+# include "lul/platform-linux-lul.h"
+#endif
+#endif
+
+#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
+class GeckoJavaSampler : public java::GeckoJavaSampler::Natives<GeckoJavaSampler>
+{
+private:
+  GeckoJavaSampler();
+
+public:
+  static double GetProfilerTime() {
+    if (!profiler_is_active()) {
+      return 0.0;
+    }
+    return profiler_time();
+  };
+};
+#endif
+
+MOZ_THREAD_LOCAL(PseudoStack *) tlsPseudoStack;
+MOZ_THREAD_LOCAL(GeckoSampler *) tlsTicker;
+MOZ_THREAD_LOCAL(void *) tlsStackTop;
+// We need to track whether we've been initialized otherwise
+// we end up using tlsStack without initializing it.
+// Because tlsStack is totally opaque to us we can't reuse
+// it as the flag itself.
+bool stack_key_initialized;
+
+mozilla::TimeStamp   sLastTracerEvent; // is raced on
+mozilla::TimeStamp   sStartTime;
+int         sFrameNumber = 0;
+int         sLastFrameNumber = 0;
+int         sInitCount = 0; // Each init must have a matched shutdown.
+static bool sIsProfiling = false; // is raced on
+static bool sIsGPUProfiling = false; // is raced on
+static bool sIsLayersDump = false; // is raced on
+static bool sIsDisplayListDump = false; // is raced on
+static bool sIsRestyleProfiling = false; // is raced on
+
+// Environment variables to control the profiler
+const char* PROFILER_HELP = "MOZ_PROFILER_HELP";
+const char* PROFILER_INTERVAL = "MOZ_PROFILER_INTERVAL";
+const char* PROFILER_ENTRIES = "MOZ_PROFILER_ENTRIES";
+const char* PROFILER_STACK = "MOZ_PROFILER_STACK_SCAN";
+const char* PROFILER_FEATURES = "MOZ_PROFILING_FEATURES";
+
+/* we don't need to worry about overflow because we only treat the
+ * case of them being the same as special. i.e. we only run into
+ * a problem if 2^32 events happen between samples that we need
+ * to know are associated with different events */
+
+// Values harvested from env vars, that control the profiler.
+static int sUnwindInterval;   /* in milliseconds */
+static int sUnwindStackScan;  /* max # of dubious frames allowed */
+static int sProfileEntries;   /* how many entries do we store? */
+
+std::vector<ThreadInfo*>* Sampler::sRegisteredThreads = nullptr;
+mozilla::UniquePtr< ::Mutex> Sampler::sRegisteredThreadsMutex;
+
+GeckoSampler* Sampler::sActiveSampler;
+
+#ifndef SPS_STANDALONE
+static mozilla::StaticAutoPtr<mozilla::ProfilerIOInterposeObserver>
+                                                            sInterposeObserver;
+#endif
+
+// The name that identifies the gecko thread for calls to
+// profiler_register_thread.
+static const char * gGeckoThreadName = "GeckoMain";
+
+void Sampler::Startup() {
+  sRegisteredThreads = new std::vector<ThreadInfo*>();
+  sRegisteredThreadsMutex = OS::CreateMutex("sRegisteredThreads mutex");
+
+  // We could create the sLUL object and read unwind info into it at
+  // this point.  That would match the lifetime implied by destruction
+  // of it in Sampler::Shutdown just below.  However, that gives a big
+  // delay on startup, even if no profiling is actually to be done.
+  // So, instead, sLUL is created on demand at the first call to
+  // Sampler::Start.
+}
+
+void Sampler::Shutdown() {
+  while (sRegisteredThreads->size() > 0) {
+    delete sRegisteredThreads->back();
+    sRegisteredThreads->pop_back();
+  }
+
+  sRegisteredThreadsMutex = nullptr;
+  delete sRegisteredThreads;
+
+  // UnregisterThread can be called after shutdown in XPCShell. Thus
+  // we need to point to null to ignore such a call after shutdown.
+  sRegisteredThreadsMutex = nullptr;
+  sRegisteredThreads = nullptr;
+
+#if defined(USE_LUL_STACKWALK)
+  // Delete the sLUL object, if it actually got created.
+  if (sLUL) {
+    delete sLUL;
+    sLUL = nullptr;
+  }
+#endif
+}
+
+StackOwningThreadInfo::StackOwningThreadInfo(const char* aName, int aThreadId,
+                                             bool aIsMainThread,
+                                             PseudoStack* aPseudoStack,
+                                             void* aStackTop)
+  : ThreadInfo(aName, aThreadId, aIsMainThread, aPseudoStack, aStackTop)
+{
+  aPseudoStack->ref();
+}
+
+StackOwningThreadInfo::~StackOwningThreadInfo()
+{
+  PseudoStack* stack = Stack();
+  if (stack) {
+    stack->deref();
+  }
+}
+
+void
+StackOwningThreadInfo::SetPendingDelete()
+{
+  PseudoStack* stack = Stack();
+  if (stack) {
+    stack->deref();
+  }
+  ThreadInfo::SetPendingDelete();
+}
+
+ProfilerMarker::ProfilerMarker(const char* aMarkerName,
+                               ProfilerMarkerPayload* aPayload,
+                               double aTime)
+  : mMarkerName(strdup(aMarkerName))
+  , mPayload(aPayload)
+  , mTime(aTime)
+{
+}
+
+ProfilerMarker::~ProfilerMarker() {
+  free(mMarkerName);
+  delete mPayload;
+}
+
+void
+ProfilerMarker::SetGeneration(uint32_t aGenID) {
+  mGenID = aGenID;
+}
+
+double
+ProfilerMarker::GetTime() const {
+  return mTime;
+}
+
+void ProfilerMarker::StreamJSON(SpliceableJSONWriter& aWriter,
+                                UniqueStacks& aUniqueStacks) const
+{
+  // Schema:
+  //   [name, time, data]
+
+  aWriter.StartArrayElement();
+  {
+    aUniqueStacks.mUniqueStrings.WriteElement(aWriter, GetMarkerName());
+    aWriter.DoubleElement(mTime);
+    // TODO: Store the callsite for this marker if available:
+    // if have location data
+    //   b.NameValue(marker, "location", ...);
+    if (mPayload) {
+      aWriter.StartObjectElement();
+      {
+          mPayload->StreamPayload(aWriter, aUniqueStacks);
+      }
+      aWriter.EndObject();
+    }
+  }
+  aWriter.EndArray();
+}
+
+/* Has MOZ_PROFILER_VERBOSE been set? */
+
+// Verbosity control for the profiler.  The aim is to check env var
+// MOZ_PROFILER_VERBOSE only once.  However, we may need to temporarily
+// override that so as to print the profiler's help message.  That's
+// what moz_profiler_set_verbosity is for.
+
+enum class ProfilerVerbosity : int8_t { UNCHECKED, NOTVERBOSE, VERBOSE };
+
+// Raced on, potentially
+static ProfilerVerbosity profiler_verbosity = ProfilerVerbosity::UNCHECKED;
+
+bool moz_profiler_verbose()
+{
+  if (profiler_verbosity == ProfilerVerbosity::UNCHECKED) {
+    if (getenv("MOZ_PROFILER_VERBOSE") != nullptr)
+      profiler_verbosity = ProfilerVerbosity::VERBOSE;
+    else
+      profiler_verbosity = ProfilerVerbosity::NOTVERBOSE;
+  }
+
+  return profiler_verbosity == ProfilerVerbosity::VERBOSE;
+}
+
+void moz_profiler_set_verbosity(ProfilerVerbosity pv)
+{
+   MOZ_ASSERT(pv == ProfilerVerbosity::UNCHECKED ||
+              pv == ProfilerVerbosity::VERBOSE);
+   profiler_verbosity = pv;
+}
+
+
+bool set_profiler_interval(const char* interval) {
+  if (interval) {
+    errno = 0;
+    long int n = strtol(interval, (char**)nullptr, 10);
+    if (errno == 0 && n >= 1 && n <= 1000) {
+      sUnwindInterval = n;
+      return true;
+    }
+    return false;
+  }
+
+  return true;
+}
+
+bool set_profiler_entries(const char* entries) {
+  if (entries) {
+    errno = 0;
+    long int n = strtol(entries, (char**)nullptr, 10);
+    if (errno == 0 && n > 0) {
+      sProfileEntries = n;
+      return true;
+    }
+    return false;
+  }
+
+  return true;
+}
+
+bool set_profiler_scan(const char* scanCount) {
+  if (scanCount) {
+    errno = 0;
+    long int n = strtol(scanCount, (char**)nullptr, 10);
+    if (errno == 0 && n >= 0 && n <= 100) {
+      sUnwindStackScan = n;
+      return true;
+    }
+    return false;
+  }
+
+  return true;
+}
+
+bool is_native_unwinding_avail() {
+# if defined(HAVE_NATIVE_UNWIND)
+  return true;
+#else
+  return false;
+#endif
+}
+
+// Read env vars at startup, so as to set:
+//   sUnwindInterval, sProfileEntries, sUnwindStackScan.
+void read_profiler_env_vars()
+{
+  /* Set defaults */
+  sUnwindInterval = 0;  /* We'll have to look elsewhere */
+  sProfileEntries = 0;
+
+  const char* interval = getenv(PROFILER_INTERVAL);
+  const char* entries = getenv(PROFILER_ENTRIES);
+  const char* scanCount = getenv(PROFILER_STACK);
+
+  if (getenv(PROFILER_HELP)) {
+     // Enable verbose output
+     moz_profiler_set_verbosity(ProfilerVerbosity::VERBOSE);
+     profiler_usage();
+     // Now force the next enquiry of moz_profiler_verbose to re-query
+     // env var MOZ_PROFILER_VERBOSE.
+     moz_profiler_set_verbosity(ProfilerVerbosity::UNCHECKED);
+  }
+
+  if (!set_profiler_interval(interval) ||
+      !set_profiler_entries(entries) ||
+      !set_profiler_scan(scanCount)) {
+      profiler_usage();
+  } else {
+    LOG( "SPS:");
+    LOGF("SPS: Sampling interval = %d ms (zero means \"platform default\")",
+        (int)sUnwindInterval);
+    LOGF("SPS: Entry store size  = %d (zero means \"platform default\")",
+        (int)sProfileEntries);
+    LOGF("SPS: UnwindStackScan   = %d (max dubious frames per unwind).",
+        (int)sUnwindStackScan);
+    LOG( "SPS:");
+  }
+}
+
+void profiler_usage() {
+  LOG( "SPS: ");
+  LOG( "SPS: Environment variable usage:");
+  LOG( "SPS: ");
+  LOG( "SPS:   MOZ_PROFILER_HELP");
+  LOG( "SPS:   If set to any value, prints this message.");
+  LOG( "SPS: ");
+  LOG( "SPS:   MOZ_PROFILER_INTERVAL=<number>   (milliseconds, 1 to 1000)");
+  LOG( "SPS:   If unset, platform default is used.");
+  LOG( "SPS: ");
+  LOG( "SPS:   MOZ_PROFILER_ENTRIES=<number>    (count, minimum of 1)");
+  LOG( "SPS:   If unset, platform default is used.");
+  LOG( "SPS: ");
+  LOG( "SPS:   MOZ_PROFILER_VERBOSE");
+  LOG( "SPS:   If set to any value, increases verbosity (recommended).");
+  LOG( "SPS: ");
+  LOG( "SPS:   MOZ_PROFILER_STACK_SCAN=<number>   (default is zero)");
+  LOG( "SPS:   The number of dubious (stack-scanned) frames allowed");
+  LOG( "SPS: ");
+  LOG( "SPS:   MOZ_PROFILER_LUL_TEST");
+  LOG( "SPS:   If set to any value, runs LUL unit tests at startup of");
+  LOG( "SPS:   the unwinder thread, and prints a short summary of results.");
+  LOG( "SPS: ");
+  LOGF("SPS:   This platform %s native unwinding.",
+       is_native_unwinding_avail() ? "supports" : "does not support");
+  LOG( "SPS: ");
+
+  /* Re-set defaults */
+  sUnwindInterval   = 0;  /* We'll have to look elsewhere */
+  sProfileEntries   = 0;
+  sUnwindStackScan  = 0;
+
+  LOG( "SPS:");
+  LOGF("SPS: Sampling interval = %d ms (zero means \"platform default\")",
+       (int)sUnwindInterval);
+  LOGF("SPS: Entry store size  = %d (zero means \"platform default\")",
+       (int)sProfileEntries);
+  LOGF("SPS: UnwindStackScan   = %d (max dubious frames per unwind).",
+       (int)sUnwindStackScan);
+  LOG( "SPS:");
+
+  return;
+}
+
+void set_tls_stack_top(void* stackTop)
+{
+  // Round |stackTop| up to the end of the containing page.  We may
+  // as well do this -- there's no danger of a fault, and we might
+  // get a few more base-of-the-stack frames as a result.  This
+  // assumes that no target has a page size smaller than 4096.
+  uintptr_t stackTopR = (uintptr_t)stackTop;
+  if (stackTop) {
+    stackTopR = (stackTopR & ~(uintptr_t)4095) + (uintptr_t)4095;
+  }
+  tlsStackTop.set((void*)stackTopR);
+}
+
+bool is_main_thread_name(const char* aName) {
+  if (!aName) {
+    return false;
+  }
+  return strcmp(aName, gGeckoThreadName) == 0;
+}
+
+#ifndef SPS_STANDALONE
+#ifdef HAVE_VA_COPY
+#define VARARGS_ASSIGN(foo, bar)        VA_COPY(foo,bar)
+#elif defined(HAVE_VA_LIST_AS_ARRAY)
+#define VARARGS_ASSIGN(foo, bar)     foo[0] = bar[0]
+#else
+#define VARARGS_ASSIGN(foo, bar)     (foo) = (bar)
+#endif
+
+void
+mozilla_sampler_log(const char *fmt, va_list args)
+{
+  if (profiler_is_active()) {
+    // nsAutoCString AppendPrintf would be nicer but
+    // this is mozilla external code
+    char buf[2048];
+    va_list argsCpy;
+    VARARGS_ASSIGN(argsCpy, args);
+    int required = VsprintfLiteral(buf, fmt, argsCpy);
+    va_end(argsCpy);
+
+    if (required < 0) {
+      return; // silently drop for now
+    } else if (required < 2048) {
+      profiler_tracing("log", buf, TRACING_EVENT);
+    } else {
+      char* heapBuf = new char[required+1];
+      va_list argsCpy;
+      VARARGS_ASSIGN(argsCpy, args);
+      vsnprintf(heapBuf, required+1, fmt, argsCpy);
+      va_end(argsCpy);
+      // EVENT_BACKTRACE could be used to get a source
+      // for all log events. This could be a runtime
+      // flag later.
+      profiler_tracing("log", heapBuf, TRACING_EVENT);
+      delete[] heapBuf;
+    }
+  }
+}
+#endif
+
+////////////////////////////////////////////////////////////////////////
+// BEGIN externally visible functions
+
+void mozilla_sampler_init(void* stackTop)
+{
+  sInitCount++;
+
+  if (stack_key_initialized)
+    return;
+
+#ifdef MOZ_TASK_TRACER
+  mozilla::tasktracer::InitTaskTracer();
+#endif
+
+#ifdef SPS_STANDALONE
+  mozilla::TimeStamp::Startup();
+#endif
+
+  LOG("BEGIN mozilla_sampler_init");
+  if (!tlsPseudoStack.init() || !tlsTicker.init() || !tlsStackTop.init()) {
+    LOG("Failed to init.");
+    return;
+  }
+  bool ignore;
+  sStartTime = mozilla::TimeStamp::ProcessCreation(ignore);
+
+  stack_key_initialized = true;
+
+  Sampler::Startup();
+
+  PseudoStack *stack = PseudoStack::create();
+  tlsPseudoStack.set(stack);
+
+  bool isMainThread = true;
+  Sampler::RegisterCurrentThread(isMainThread ?
+                                   gGeckoThreadName : "Application Thread",
+                                 stack, isMainThread, stackTop);
+
+  // Read interval settings from MOZ_PROFILER_INTERVAL and stack-scan
+  // threshhold from MOZ_PROFILER_STACK_SCAN.
+  read_profiler_env_vars();
+
+  // platform specific initialization
+  OS::Startup();
+
+#ifndef SPS_STANDALONE
+  set_stderr_callback(mozilla_sampler_log);
+#endif
+
+#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
+  if (mozilla::jni::IsFennec()) {
+    GeckoJavaSampler::Init();
+  }
+#endif
+
+  // We can't open pref so we use an environment variable
+  // to know if we should trigger the profiler on startup
+  // NOTE: Default
+  const char *val = getenv("MOZ_PROFILER_STARTUP");
+  if (!val || !*val) {
+    return;
+  }
+
+  const char* features[] = {"js"
+                         , "leaf"
+                         , "threads"
+#if defined(XP_WIN) || defined(XP_MACOSX) \
+    || (defined(SPS_ARCH_arm) && defined(linux)) \
+    || defined(SPS_PLAT_amd64_linux) || defined(SPS_PLAT_x86_linux)
+                         , "stackwalk"
+#endif
+#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
+                         , "java"
+#endif
+                         };
+
+  const char* threadFilters[] = { "GeckoMain", "Compositor" };
+
+  profiler_start(PROFILE_DEFAULT_ENTRY, PROFILE_DEFAULT_INTERVAL,
+                         features, MOZ_ARRAY_LENGTH(features),
+                         threadFilters, MOZ_ARRAY_LENGTH(threadFilters));
+  LOG("END   mozilla_sampler_init");
+}
+
+void mozilla_sampler_shutdown()
+{
+  sInitCount--;
+
+  if (sInitCount > 0)
+    return;
+
+  // Save the profile on shutdown if requested.
+  GeckoSampler *t = tlsTicker.get();
+  if (t) {
+    const char *val = getenv("MOZ_PROFILER_SHUTDOWN");
+    if (val) {
+      std::ofstream stream;
+      stream.open(val);
+      if (stream.is_open()) {
+        t->ToStreamAsJSON(stream);
+        stream.close();
+      }
+    }
+  }
+
+  profiler_stop();
+
+#ifndef SPS_STANDALONE
+  set_stderr_callback(nullptr);
+#endif
+
+  Sampler::Shutdown();
+
+#ifdef SPS_STANDALONE
+  mozilla::TimeStamp::Shutdown();
+#endif
+
+  PseudoStack *stack = tlsPseudoStack.get();
+  stack->deref();
+  tlsPseudoStack.set(nullptr);
+
+#ifdef MOZ_TASK_TRACER
+  mozilla::tasktracer::ShutdownTaskTracer();
+#endif
+}
+
+void mozilla_sampler_save()
+{
+  GeckoSampler *t = tlsTicker.get();
+  if (!t) {
+    return;
+  }
+
+  t->RequestSave();
+  // We're on the main thread already so we don't
+  // have to wait to handle the save request.
+  t->HandleSaveRequest();
+}
+
+mozilla::UniquePtr<char[]> mozilla_sampler_get_profile(double aSinceTime)
+{
+  GeckoSampler *t = tlsTicker.get();
+  if (!t) {
+    return nullptr;
+  }
+
+  return t->ToJSON(aSinceTime);
+}
+
+#ifndef SPS_STANDALONE
+JSObject *mozilla_sampler_get_profile_data(JSContext *aCx, double aSinceTime)
+{
+  GeckoSampler *t = tlsTicker.get();
+  if (!t) {
+    return nullptr;
+  }
+
+  return t->ToJSObject(aCx, aSinceTime);
+}
+
+void mozilla_sampler_get_profile_data_async(double aSinceTime,
+                                            mozilla::dom::Promise* aPromise)
+{
+  GeckoSampler *t = tlsTicker.get();
+  if (NS_WARN_IF(!t)) {
+    return;
+  }
+
+  t->ToJSObjectAsync(aSinceTime, aPromise);
+}
+
+void mozilla_sampler_get_profiler_start_params(int* aEntrySize,
+                                               double* aInterval,
+                                               mozilla::Vector<const char*>* aFilters,
+                                               mozilla::Vector<const char*>* aFeatures)
+{
+  if (NS_WARN_IF(!aEntrySize) || NS_WARN_IF(!aInterval) ||
+      NS_WARN_IF(!aFilters) || NS_WARN_IF(!aFeatures)) {
+    return;
+  }
+
+  GeckoSampler *t = tlsTicker.get();
+  if (NS_WARN_IF(!t)) {
+    return;
+  }
+
+  *aEntrySize = t->EntrySize();
+  *aInterval = t->interval();
+
+  const ThreadNameFilterList& threadNameFilterList = t->ThreadNameFilters();
+  MOZ_ALWAYS_TRUE(aFilters->resize(threadNameFilterList.length()));
+  for (uint32_t i = 0; i < threadNameFilterList.length(); ++i) {
+    (*aFilters)[i] = threadNameFilterList[i].c_str();
+  }
+
+  const FeatureList& featureList = t->Features();
+  MOZ_ALWAYS_TRUE(aFeatures->resize(featureList.length()));
+  for (size_t i = 0; i < featureList.length(); ++i) {
+    (*aFeatures)[i] = featureList[i].c_str();
+  }
+}
+
+void mozilla_sampler_get_gatherer(nsISupports** aRetVal)
+{
+  if (!aRetVal) {
+    return;
+  }
+
+  if (NS_WARN_IF(!profiler_is_active())) {
+    *aRetVal = nullptr;
+    return;
+  }
+
+  GeckoSampler *t = tlsTicker.get();
+  if (NS_WARN_IF(!t)) {
+    *aRetVal = nullptr;
+    return;
+  }
+
+  t->GetGatherer(aRetVal);
+}
+
+#endif
+
+void mozilla_sampler_save_profile_to_file(const char* aFilename)
+{
+  GeckoSampler *t = tlsTicker.get();
+  if (!t) {
+    return;
+  }
+
+  std::ofstream stream;
+  stream.open(aFilename);
+  if (stream.is_open()) {
+    t->ToStreamAsJSON(stream);
+    stream.close();
+    LOGF("Saved to %s", aFilename);
+  } else {
+    LOG("Fail to open profile log file.");
+  }
+}
+
+
+const char** mozilla_sampler_get_features()
+{
+  static const char* features[] = {
+#if defined(MOZ_PROFILING) && defined(HAVE_NATIVE_UNWIND)
+    // Walk the C++ stack.
+    "stackwalk",
+#endif
+#if defined(ENABLE_SPS_LEAF_DATA)
+    // Include the C++ leaf node if not stackwalking. DevTools
+    // profiler doesn't want the native addresses.
+    "leaf",
+#endif
+#if !defined(SPS_OS_windows)
+    // Use a seperate thread of walking the stack.
+    "unwinder",
+#endif
+    "java",
+    // Only record samples during periods of bad responsiveness
+    "jank",
+    // Tell the JS engine to emmit pseudostack entries in the
+    // pro/epilogue.
+    "js",
+    // GPU Profiling (may not be supported by the GL)
+    "gpu",
+    // Profile the registered secondary threads.
+    "threads",
+    // Do not include user-identifiable information
+    "privacy",
+    // Dump the layer tree with the textures.
+    "layersdump",
+    // Dump the display list with the textures.
+    "displaylistdump",
+    // Add main thread I/O to the profile
+    "mainthreadio",
+    // Add RSS collection
+    "memory",
+#ifdef MOZ_TASK_TRACER
+    // Start profiling with feature TaskTracer.
+    "tasktracer",
+#endif
+#if defined(XP_WIN)
+    // Add power collection
+    "power",
+#endif
+    nullptr
+  };
+
+  return features;
+}
+
+void mozilla_sampler_get_buffer_info(uint32_t *aCurrentPosition, uint32_t *aTotalSize,
+                                     uint32_t *aGeneration)
+{
+  *aCurrentPosition = 0;
+  *aTotalSize = 0;
+  *aGeneration = 0;
+
+  if (!stack_key_initialized)
+    return;
+
+  GeckoSampler *t = tlsTicker.get();
+  if (!t)
+    return;
+
+  t->GetBufferInfo(aCurrentPosition, aTotalSize, aGeneration);
+}
+
+// Values are only honored on the first start
+void mozilla_sampler_start(int aProfileEntries, double aInterval,
+                           const char** aFeatures, uint32_t aFeatureCount,
+                           const char** aThreadNameFilters, uint32_t aFilterCount)
+
+{
+  LOG("BEGIN mozilla_sampler_start");
+
+  if (!stack_key_initialized)
+    profiler_init(nullptr);
+
+  /* If the sampling interval was set using env vars, use that
+     in preference to anything else. */
+  if (sUnwindInterval > 0)
+    aInterval = sUnwindInterval;
+
+  /* If the entry count was set using env vars, use that, too: */
+  if (sProfileEntries > 0)
+    aProfileEntries = sProfileEntries;
+
+  // Reset the current state if the profiler is running
+  profiler_stop();
+
+  GeckoSampler* t;
+  t = new GeckoSampler(aInterval ? aInterval : PROFILE_DEFAULT_INTERVAL,
+                      aProfileEntries ? aProfileEntries : PROFILE_DEFAULT_ENTRY,
+                      aFeatures, aFeatureCount,
+                      aThreadNameFilters, aFilterCount);
+
+  tlsTicker.set(t);
+  t->Start();
+  if (t->ProfileJS() || t->InPrivacyMode()) {
+      ::MutexAutoLock lock(*Sampler::sRegisteredThreadsMutex);
+      std::vector<ThreadInfo*> threads = t->GetRegisteredThreads();
+
+      for (uint32_t i = 0; i < threads.size(); i++) {
+        ThreadInfo* info = threads[i];
+        if (info->IsPendingDelete()) {
+          continue;
+        }
+        ThreadProfile* thread_profile = info->Profile();
+        if (!thread_profile) {
+          continue;
+        }
+        thread_profile->GetPseudoStack()->reinitializeOnResume();
+#ifndef SPS_STANDALONE
+        if (t->ProfileJS()) {
+          thread_profile->GetPseudoStack()->enableJSSampling();
+        }
+        if (t->InPrivacyMode()) {
+          thread_profile->GetPseudoStack()->mPrivacyMode = true;
+        }
+#endif
+      }
+  }
+
+#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
+  if (t->ProfileJava()) {
+    int javaInterval = aInterval;
+    // Java sampling doesn't accuratly keep up with 1ms sampling
+    if (javaInterval < 10) {
+      aInterval = 10;
+    }
+    java::GeckoJavaSampler::Start(javaInterval, 1000);
+  }
+#endif
+
+#ifndef SPS_STANDALONE
+  if (t->AddMainThreadIO()) {
+    if (!sInterposeObserver) {
+      // Lazily create IO interposer observer
+      sInterposeObserver = new mozilla::ProfilerIOInterposeObserver();
+    }
+    mozilla::IOInterposer::Register(mozilla::IOInterposeObserver::OpAll,
+                                    sInterposeObserver);
+  }
+#endif
+
+  sIsProfiling = true;
+#ifndef SPS_STANDALONE
+  sIsGPUProfiling = t->ProfileGPU();
+  sIsLayersDump = t->LayersDump();
+  sIsDisplayListDump = t->DisplayListDump();
+  sIsRestyleProfiling = t->ProfileRestyle();
+
+  if (Sampler::CanNotifyObservers()) {
+    nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
+    if (os) {
+      nsTArray<nsCString> featuresArray;
+      nsTArray<nsCString> threadNameFiltersArray;
+
+      for (size_t i = 0; i < aFeatureCount; ++i) {
+        featuresArray.AppendElement(aFeatures[i]);
+      }
+
+      for (size_t i = 0; i < aFilterCount; ++i) {
+        threadNameFiltersArray.AppendElement(aThreadNameFilters[i]);
+      }
+
+      nsCOMPtr<nsIProfilerStartParams> params =
+        new nsProfilerStartParams(aProfileEntries, aInterval, featuresArray,
+                                  threadNameFiltersArray);
+
+      os->NotifyObservers(params, "profiler-started", nullptr);
+    }
+  }
+#endif
+
+  LOG("END   mozilla_sampler_start");
+}
+
+void mozilla_sampler_stop()
+{
+  LOG("BEGIN mozilla_sampler_stop");
+
+  if (!stack_key_initialized)
+    return;
+
+  GeckoSampler *t = tlsTicker.get();
+  if (!t) {
+    LOG("END   mozilla_sampler_stop-early");
+    return;
+  }
+
+  bool disableJS = t->ProfileJS();
+
+  t->Stop();
+  delete t;
+  tlsTicker.set(nullptr);
+
+#ifndef SPS_STANDALONE
+  if (disableJS) {
+    PseudoStack *stack = tlsPseudoStack.get();
+    ASSERT(stack != nullptr);
+    stack->disableJSSampling();
+  }
+
+  mozilla::IOInterposer::Unregister(mozilla::IOInterposeObserver::OpAll,
+                                    sInterposeObserver);
+  sInterposeObserver = nullptr;
+#endif
+
+  sIsProfiling = false;
+#ifndef SPS_STANDALONE
+  sIsGPUProfiling = false;
+  sIsLayersDump = false;
+  sIsDisplayListDump = false;
+  sIsRestyleProfiling = false;
+
+  if (Sampler::CanNotifyObservers()) {
+    nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
+    if (os)
+      os->NotifyObservers(nullptr, "profiler-stopped", nullptr);
+  }
+#endif
+
+  LOG("END   mozilla_sampler_stop");
+}
+
+bool mozilla_sampler_is_paused() {
+  if (Sampler::GetActiveSampler()) {
+    return Sampler::GetActiveSampler()->IsPaused();
+  } else {
+    return false;
+  }
+}
+
+void mozilla_sampler_pause() {
+  if (Sampler::GetActiveSampler()) {
+    Sampler::GetActiveSampler()->SetPaused(true);
+#ifndef SPS_STANDALONE
+  if (Sampler::CanNotifyObservers()) {
+    nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
+    if (os)
+      os->NotifyObservers(nullptr, "profiler-paused", nullptr);
+  }
+#endif
+  }
+}
+
+void mozilla_sampler_resume() {
+  if (Sampler::GetActiveSampler()) {
+    Sampler::GetActiveSampler()->SetPaused(false);
+#ifndef SPS_STANDALONE
+  if (Sampler::CanNotifyObservers()) {
+    nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
+    if (os)
+      os->NotifyObservers(nullptr, "profiler-resumed", nullptr);
+  }
+#endif
+  }
+}
+
+bool mozilla_sampler_feature_active(const char* aName)
+{
+  if (!profiler_is_active()) {
+    return false;
+  }
+
+  if (strcmp(aName, "gpu") == 0) {
+    return sIsGPUProfiling;
+  }
+
+  if (strcmp(aName, "layersdump") == 0) {
+    return sIsLayersDump;
+  }
+
+  if (strcmp(aName, "displaylistdump") == 0) {
+    return sIsDisplayListDump;
+  }
+
+  if (strcmp(aName, "restyle") == 0) {
+    return sIsRestyleProfiling;
+  }
+
+  return false;
+}
+
+bool mozilla_sampler_is_active()
+{
+  return sIsProfiling;
+}
+
+void mozilla_sampler_responsiveness(const mozilla::TimeStamp& aTime)
+{
+  sLastTracerEvent = aTime;
+}
+
+void mozilla_sampler_frame_number(int frameNumber)
+{
+  sFrameNumber = frameNumber;
+}
+
+void mozilla_sampler_lock()
+{
+  profiler_stop();
+#ifndef SPS_STANDALONE
+  nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
+  if (os)
+    os->NotifyObservers(nullptr, "profiler-locked", nullptr);
+#endif
+}
+
+void mozilla_sampler_unlock()
+{
+#ifndef SPS_STANDALONE
+  nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
+  if (os)
+    os->NotifyObservers(nullptr, "profiler-unlocked", nullptr);
+#endif
+}
+
+bool mozilla_sampler_register_thread(const char* aName, void* aGuessStackTop)
+{
+  if (sInitCount == 0) {
+    return false;
+  }
+
+#if defined(MOZ_WIDGET_GONK) && !defined(MOZ_PROFILING)
+  // The only way to profile secondary threads on b2g
+  // is to build with profiling OR have the profiler
+  // running on startup.
+  if (!profiler_is_active()) {
+    return false;
+  }
+#endif
+
+  MOZ_ASSERT(tlsPseudoStack.get() == nullptr);
+  PseudoStack* stack = PseudoStack::create();
+  tlsPseudoStack.set(stack);
+  bool isMainThread = is_main_thread_name(aName);
+  void* stackTop = GetStackTop(aGuessStackTop);
+  return Sampler::RegisterCurrentThread(aName, stack, isMainThread, stackTop);
+}
+
+void mozilla_sampler_unregister_thread()
+{
+  // Don't check sInitCount count here -- we may be unregistering the
+  // thread after the sampler was shut down.
+  if (!stack_key_initialized) {
+    return;
+  }
+
+  PseudoStack *stack = tlsPseudoStack.get();
+  if (!stack) {
+    return;
+  }
+  stack->deref();
+  tlsPseudoStack.set(nullptr);
+
+  Sampler::UnregisterCurrentThread();
+}
+
+void mozilla_sampler_sleep_start() {
+    if (sInitCount == 0) {
+	return;
+    }
+
+    PseudoStack *stack = tlsPseudoStack.get();
+    if (stack == nullptr) {
+      return;
+    }
+    stack->setSleeping(1);
+}
+
+void mozilla_sampler_sleep_end() {
+    if (sInitCount == 0) {
+	return;
+    }
+
+    PseudoStack *stack = tlsPseudoStack.get();
+    if (stack == nullptr) {
+      return;
+    }
+    stack->setSleeping(0);
+}
+
+bool mozilla_sampler_is_sleeping() {
+  if (sInitCount == 0) {
+    return false;
+  }
+  PseudoStack *stack = tlsPseudoStack.get();
+  if (stack == nullptr) {
+    return false;
+  }
+  return stack->isSleeping();
+}
+
+double mozilla_sampler_time(const mozilla::TimeStamp& aTime)
+{
+  mozilla::TimeDuration delta = aTime - sStartTime;
+  return delta.ToMilliseconds();
+}
+
+double mozilla_sampler_time()
+{
+  return mozilla_sampler_time(mozilla::TimeStamp::Now());
+}
+
+ProfilerBacktrace* mozilla_sampler_get_backtrace()
+{
+  if (!stack_key_initialized)
+    return nullptr;
+
+  // Don't capture a stack if we're not profiling
+  if (!profiler_is_active()) {
+    return nullptr;
+  }
+
+  // Don't capture a stack if we don't want to include personal information
+  if (profiler_in_privacy_mode()) {
+    return nullptr;
+  }
+
+  GeckoSampler* t = tlsTicker.get();
+  if (!t) {
+    return nullptr;
+  }
+
+  return new ProfilerBacktrace(t->GetBacktrace());
+}
+
+void mozilla_sampler_free_backtrace(ProfilerBacktrace* aBacktrace)
+{
+  delete aBacktrace;
+}
+
+// Fill the output buffer with the following pattern:
+// "Lable 1" "\0" "Label 2" "\0" ... "Label N" "\0" "\0"
+// TODO: use the unwinder instead of pseudo stack.
+void mozilla_sampler_get_backtrace_noalloc(char *output, size_t outputSize)
+{
+  MOZ_ASSERT(outputSize >= 2);
+  char *bound = output + outputSize - 2;
+  output[0] = output[1] = '\0';
+  PseudoStack *pseudoStack = tlsPseudoStack.get();
+  if (!pseudoStack) {
+    return;
+  }
+
+  volatile StackEntry *pseudoFrames = pseudoStack->mStack;
+  uint32_t pseudoCount = pseudoStack->stackSize();
+
+  for (uint32_t i = 0; i < pseudoCount; i++) {
+    size_t len = strlen(pseudoFrames[i].label());
+    if (output + len >= bound)
+      break;
+    strcpy(output, pseudoFrames[i].label());
+    output += len;
+    *output++ = '\0';
+    *output = '\0';
+  }
+}
+
+void mozilla_sampler_tracing(const char* aCategory, const char* aInfo,
+                             TracingMetadata aMetaData)
+{
+  mozilla_sampler_add_marker(aInfo, new ProfilerMarkerTracing(aCategory, aMetaData));
+}
+
+void mozilla_sampler_tracing(const char* aCategory, const char* aInfo,
+                             ProfilerBacktrace* aCause,
+                             TracingMetadata aMetaData)
+{
+  mozilla_sampler_add_marker(aInfo, new ProfilerMarkerTracing(aCategory, aMetaData, aCause));
+}
+
+void mozilla_sampler_add_marker(const char *aMarker, ProfilerMarkerPayload *aPayload)
+{
+  // Note that aPayload may be allocated by the caller, so we need to make sure
+  // that we free it at some point.
+  mozilla::UniquePtr<ProfilerMarkerPayload> payload(aPayload);
+
+  if (!stack_key_initialized)
+    return;
+
+  // Don't insert a marker if we're not profiling to avoid
+  // the heap copy (malloc).
+  if (!profiler_is_active()) {
+    return;
+  }
+
+  // Don't add a marker if we don't want to include personal information
+  if (profiler_in_privacy_mode()) {
+    return;
+  }
+
+  PseudoStack *stack = tlsPseudoStack.get();
+  if (!stack) {
+    return;
+  }
+
+  mozilla::TimeStamp origin = (aPayload && !aPayload->GetStartTime().IsNull()) ?
+                     aPayload->GetStartTime() : mozilla::TimeStamp::Now();
+  mozilla::TimeDuration delta = origin - sStartTime;
+  stack->addMarker(aMarker, payload.release(), delta.ToMilliseconds());
+}
+
+#ifndef SPS_STANDALONE
+#include "mozilla/Mutex.h"
+
+class GeckoMutex : public ::Mutex {
+ public:
+  explicit GeckoMutex(const char* aDesc) :
+    mMutex(aDesc)
+  {}
+
+  virtual ~GeckoMutex() {}
+
+  virtual int Lock() {
+    mMutex.Lock();
+    return 0;
+  }
+
+  virtual int Unlock() {
+    mMutex.Unlock();
+    return 0;
+  }
+
+ private:
+  mozilla::Mutex mMutex;
+};
+
+mozilla::UniquePtr< ::Mutex> OS::CreateMutex(const char* aDesc) {
+  return mozilla::MakeUnique<GeckoMutex>(aDesc);
+}
+
+#else
+// Otherwise use c++11 Mutex
+#include <mutex>
+
+class OSXMutex : public ::Mutex {
+ public:
+  OSXMutex(const char* aDesc) :
+    mMutex()
+  {}
+
+  virtual ~OSXMutex() {}
+
+  virtual int Lock() {
+    mMutex.lock();
+    return 0;
+  }
+
+  virtual int Unlock() {
+    mMutex.unlock();
+    return 0;
+  }
+
+ private:
+  std::mutex mMutex;
+};
+
+mozilla::UniquePtr< ::Mutex> OS::CreateMutex(const char* aDesc) {
+  return mozilla::MakeUnique<GeckoMutex>(aDesc);
+}
+
+#endif
+
+// END externally visible functions
+////////////////////////////////////////////////////////////////////////
diff --git a/tools/profiler/core/platform.h b/tools/profiler/core/platform.h
new file mode 100644
index 000000000..2e736d97c
--- /dev/null
+++ b/tools/profiler/core/platform.h
@@ -0,0 +1,431 @@
+// Copyright (c) 2006-2011 The Chromium Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//  * Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//  * Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in
+//    the documentation and/or other materials provided with the
+//    distribution.
+//  * Neither the name of Google, Inc. nor the names of its contributors
+//    may be used to endorse or promote products derived from this
+//    software without specific prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+// SUCH DAMAGE.
+
+#ifndef TOOLS_PLATFORM_H_
+#define TOOLS_PLATFORM_H_
+
+#ifdef SPS_STANDALONE
+#define MOZ_COUNT_CTOR(name)
+#define MOZ_COUNT_DTOR(name)
+#endif
+
+#ifdef ANDROID
+#include <android/log.h>
+#else
+#define __android_log_print(a, ...)
+#endif
+
+#ifdef XP_UNIX
+#include <pthread.h>
+#endif
+
+#include <stdint.h>
+#include <math.h>
+#ifndef SPS_STANDALONE
+#include "MainThreadUtils.h"
+#include "mozilla/Mutex.h"
+#include "ThreadResponsiveness.h"
+#endif
+#include "mozilla/TimeStamp.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/Unused.h"
+#include "PlatformMacros.h"
+#include "v8-support.h"
+#include <vector>
+#include "StackTop.h"
+
+// We need a definition of gettid(), but Linux libc implementations don't
+// provide a wrapper for it (except for Bionic)
+#if defined(__linux__)
+#include <unistd.h>
+#if !defined(__BIONIC__)
+#include <sys/syscall.h>
+static inline pid_t gettid()
+{
+  return (pid_t) syscall(SYS_gettid);
+}
+#endif
+#endif
+
+#ifdef XP_WIN
+#include <windows.h>
+#endif
+
+#define ASSERT(a) MOZ_ASSERT(a)
+
+bool moz_profiler_verbose();
+
+#ifdef ANDROID
+# if defined(__arm__) || defined(__thumb__)
+#  define ENABLE_SPS_LEAF_DATA
+#  define ENABLE_ARM_LR_SAVING
+# endif
+# define LOG(text) \
+    do { if (moz_profiler_verbose()) \
+           __android_log_write(ANDROID_LOG_ERROR, "Profiler", text); \
+    } while (0)
+# define LOGF(format, ...) \
+    do { if (moz_profiler_verbose()) \
+           __android_log_print(ANDROID_LOG_ERROR, "Profiler", format, \
+                               __VA_ARGS__); \
+    } while (0)
+
+#else
+# define LOG(text) \
+    do { if (moz_profiler_verbose()) fprintf(stderr, "Profiler: %s\n", text); \
+    } while (0)
+# define LOGF(format, ...) \
+    do { if (moz_profiler_verbose()) fprintf(stderr, "Profiler: " format \
+                                             "\n", __VA_ARGS__);        \
+    } while (0)
+
+#endif
+
+#if defined(XP_MACOSX) || defined(XP_WIN) || defined(XP_LINUX)
+#define ENABLE_SPS_LEAF_DATA
+#endif
+
+typedef int32_t Atomic32;
+
+extern mozilla::TimeStamp sStartTime;
+
+typedef uint8_t* Address;
+
+// ----------------------------------------------------------------------------
+// Mutex
+//
+// Mutexes are used for serializing access to non-reentrant sections of code.
+// The implementations of mutex should allow for nested/recursive locking.
+
+class Mutex {
+ public:
+  virtual ~Mutex() {}
+
+  // Locks the given mutex. If the mutex is currently unlocked, it becomes
+  // locked and owned by the calling thread, and immediately. If the mutex
+  // is already locked by another thread, suspends the calling thread until
+  // the mutex is unlocked.
+  virtual int Lock() = 0;
+
+  // Unlocks the given mutex. The mutex is assumed to be locked and owned by
+  // the calling thread on entrance.
+  virtual int Unlock() = 0;
+};
+
+class MutexAutoLock {
+ public:
+  explicit MutexAutoLock(::Mutex& aMutex)
+    : mMutex(&aMutex)
+  {
+    mMutex->Lock();
+  }
+
+  ~MutexAutoLock() {
+    mMutex->Unlock();
+  }
+
+ private:
+  Mutex* mMutex;
+};
+
+// ----------------------------------------------------------------------------
+// OS
+//
+// This class has static methods for the different platform specific
+// functions. Add methods here to cope with differences between the
+// supported platforms.
+
+class OS {
+ public:
+
+  // Sleep for a number of milliseconds.
+  static void Sleep(const int milliseconds);
+
+  // Sleep for a number of microseconds.
+  static void SleepMicro(const int microseconds);
+
+  // Called on startup to initialize platform specific things
+  static void Startup();
+
+  static mozilla::UniquePtr< ::Mutex> CreateMutex(const char* aDesc);
+
+ private:
+  static const int msPerSecond = 1000;
+
+};
+
+
+
+
+// ----------------------------------------------------------------------------
+// Thread
+//
+// Thread objects are used for creating and running threads. When the start()
+// method is called the new thread starts running the run() method in the new
+// thread. The Thread object should not be deallocated before the thread has
+// terminated.
+
+class Thread {
+ public:
+  // Create new thread.
+  explicit Thread(const char* name);
+  virtual ~Thread();
+
+  // Start new thread by calling the Run() method in the new thread.
+  void Start();
+
+  void Join();
+
+  inline const char* name() const {
+    return name_;
+  }
+
+  // Abstract method for run handler.
+  virtual void Run() = 0;
+
+  // The thread name length is limited to 16 based on Linux's implementation of
+  // prctl().
+  static const int kMaxThreadNameLength = 16;
+
+#ifdef XP_WIN
+  HANDLE thread_;
+  typedef DWORD tid_t;
+  tid_t thread_id_;
+#else
+  typedef ::pid_t tid_t;
+#endif
+#if defined(XP_MACOSX)
+  pthread_t thread_;
+#endif
+
+  static tid_t GetCurrentId();
+
+ private:
+  void set_name(const char *name);
+
+  char name_[kMaxThreadNameLength];
+  int stack_size_;
+
+  DISALLOW_COPY_AND_ASSIGN(Thread);
+};
+
+// ----------------------------------------------------------------------------
+// HAVE_NATIVE_UNWIND
+//
+// Pseudo backtraces are available on all platforms.  Native
+// backtraces are available only on selected platforms.  Breakpad is
+// the only supported native unwinder.  HAVE_NATIVE_UNWIND is set at
+// build time to indicate whether native unwinding is possible on this
+// platform.
+
+#undef HAVE_NATIVE_UNWIND
+#if defined(MOZ_PROFILING) \
+    && (defined(SPS_PLAT_amd64_linux) || defined(SPS_PLAT_arm_android) \
+        || (defined(MOZ_WIDGET_ANDROID) && defined(__arm__)) \
+        || defined(SPS_PLAT_x86_linux) \
+        || defined(SPS_OS_windows) \
+        || defined(SPS_OS_darwin))
+# define HAVE_NATIVE_UNWIND
+#endif
+
+/* Some values extracted at startup from environment variables, that
+   control the behaviour of the breakpad unwinder. */
+extern const char* PROFILER_INTERVAL;
+extern const char* PROFILER_ENTRIES;
+extern const char* PROFILER_STACK;
+extern const char* PROFILER_FEATURES;
+
+void read_profiler_env_vars();
+void profiler_usage();
+
+// Helper methods to expose modifying profiler behavior
+bool set_profiler_interval(const char*);
+bool set_profiler_entries(const char*);
+bool set_profiler_scan(const char*);
+bool is_native_unwinding_avail();
+
+void set_tls_stack_top(void* stackTop);
+
+// ----------------------------------------------------------------------------
+// Sampler
+//
+// A sampler periodically samples the state of the VM and optionally
+// (if used for profiling) the program counter and stack pointer for
+// the thread that created it.
+
+struct PseudoStack;
+class ThreadProfile;
+
+// TickSample captures the information collected for each sample.
+class TickSample {
+ public:
+  TickSample()
+      : pc(NULL)
+      , sp(NULL)
+      , fp(NULL)
+#ifdef ENABLE_ARM_LR_SAVING
+      , lr(NULL)
+#endif
+      , context(NULL)
+      , isSamplingCurrentThread(false)
+      , threadProfile(nullptr)
+      , rssMemory(0)
+      , ussMemory(0)
+  {}
+
+  void PopulateContext(void* aContext);
+
+  Address pc;  // Instruction pointer.
+  Address sp;  // Stack pointer.
+  Address fp;  // Frame pointer.
+#ifdef ENABLE_ARM_LR_SAVING
+  Address lr;  // ARM link register
+#endif
+  void*   context;   // The context from the signal handler, if available. On
+                     // Win32 this may contain the windows thread context.
+  bool    isSamplingCurrentThread;
+  ThreadProfile* threadProfile;
+  mozilla::TimeStamp timestamp;
+  int64_t rssMemory;
+  int64_t ussMemory;
+};
+
+class ThreadInfo;
+class PlatformData;
+class GeckoSampler;
+class SyncProfile;
+class Sampler {
+ public:
+  // Initialize sampler.
+  explicit Sampler(double interval, bool profiling, int entrySize);
+  virtual ~Sampler();
+
+  double interval() const { return interval_; }
+
+  // This method is called for each sampling period with the current
+  // program counter.
+  virtual void Tick(TickSample* sample) = 0;
+
+  // Immediately captures the calling thread's call stack and returns it.
+  virtual SyncProfile* GetBacktrace() = 0;
+
+  // Request a save from a signal handler
+  virtual void RequestSave() = 0;
+  // Process any outstanding request outside a signal handler.
+  virtual void HandleSaveRequest() = 0;
+  // Delete markers which are no longer part of the profile due to buffer wraparound.
+  virtual void DeleteExpiredMarkers() = 0;
+
+  // Start and stop sampler.
+  void Start();
+  void Stop();
+
+  // Is the sampler used for profiling?
+  bool IsProfiling() const { return profiling_; }
+
+  // Whether the sampler is running (that is, consumes resources).
+  bool IsActive() const { return active_; }
+
+  // Low overhead way to stop the sampler from ticking
+  bool IsPaused() const { return paused_; }
+  void SetPaused(bool value) { NoBarrier_Store(&paused_, value); }
+
+  virtual bool ProfileThreads() const = 0;
+
+  int EntrySize() { return entrySize_; }
+
+  // We can't new/delete the type safely without defining it
+  // (-Wdelete-incomplete). Use these Alloc/Free functions instead.
+  static PlatformData* AllocPlatformData(int aThreadId);
+  static void FreePlatformData(PlatformData*);
+
+  // If we move the backtracing code into the platform files we won't
+  // need to have these hacks
+#ifdef XP_WIN
+  // xxxehsan sucky hack :(
+  static uintptr_t GetThreadHandle(PlatformData*);
+#endif
+#ifdef XP_MACOSX
+  static pthread_t GetProfiledThread(PlatformData*);
+#endif
+
+  static std::vector<ThreadInfo*> GetRegisteredThreads() {
+    return *sRegisteredThreads;
+  }
+
+  static bool RegisterCurrentThread(const char* aName,
+                                    PseudoStack* aPseudoStack,
+                                    bool aIsMainThread, void* stackTop);
+  static void UnregisterCurrentThread();
+
+  static void Startup();
+  // Should only be called on shutdown
+  static void Shutdown();
+
+  static GeckoSampler* GetActiveSampler() { return sActiveSampler; }
+  static void SetActiveSampler(GeckoSampler* sampler) { sActiveSampler = sampler; }
+
+  static mozilla::UniquePtr<Mutex> sRegisteredThreadsMutex;
+
+  static bool CanNotifyObservers() {
+#ifdef MOZ_WIDGET_GONK
+    // We use profile.sh on b2g to manually select threads and options per process.
+    return false;
+#elif defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
+    // Android ANR reporter uses the profiler off the main thread
+    return NS_IsMainThread();
+#else
+    MOZ_ASSERT(NS_IsMainThread());
+    return true;
+#endif
+  }
+
+ protected:
+  static std::vector<ThreadInfo*>* sRegisteredThreads;
+  static GeckoSampler* sActiveSampler;
+
+ private:
+  void SetActive(bool value) { NoBarrier_Store(&active_, value); }
+
+  const double interval_;
+  const bool profiling_;
+  Atomic32 paused_;
+  Atomic32 active_;
+  const int entrySize_;
+
+  // Refactor me!
+#if defined(SPS_OS_linux) || defined(SPS_OS_android)
+  bool signal_handler_installed_;
+  struct sigaction old_sigprof_signal_handler_;
+  struct sigaction old_sigsave_signal_handler_;
+  bool signal_sender_launched_;
+  pthread_t signal_sender_thread_;
+#endif
+};
+
+#endif /* ndef TOOLS_PLATFORM_H_ */
diff --git a/tools/profiler/core/shared-libraries-linux.cc b/tools/profiler/core/shared-libraries-linux.cc
new file mode 100644
index 000000000..24437fb4e
--- /dev/null
+++ b/tools/profiler/core/shared-libraries-linux.cc
@@ -0,0 +1,159 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "shared-libraries.h"
+
+#define PATH_MAX_TOSTRING(x) #x
+#define PATH_MAX_STRING(x) PATH_MAX_TOSTRING(x)
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <limits.h>
+#include <unistd.h>
+#include <fstream>
+#include "platform.h"
+#include "shared-libraries.h"
+
+#include "common/linux/file_id.h"
+#include <algorithm>
+
+#define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
+
+// Get the breakpad Id for the binary file pointed by bin_name
+static std::string getId(const char *bin_name)
+{
+  using namespace google_breakpad;
+  using namespace std;
+
+  PageAllocator allocator;
+  auto_wasteful_vector<uint8_t, sizeof(MDGUID)> identifier(&allocator);
+
+  FileID file_id(bin_name);
+  if (file_id.ElfFileIdentifier(identifier)) {
+    return FileID::ConvertIdentifierToUUIDString(identifier) + "0";
+  }
+
+  return "";
+}
+
+#if !defined(MOZ_WIDGET_GONK)
+// TODO fix me with proper include
+#include "nsDebug.h"
+#ifdef ANDROID
+#include "ElfLoader.h" // dl_phdr_info
+#else
+#include <link.h> // dl_phdr_info
+#endif
+#include <features.h>
+#include <dlfcn.h>
+#include <sys/types.h>
+
+#ifdef ANDROID
+extern "C" MOZ_EXPORT __attribute__((weak))
+int dl_iterate_phdr(
+          int (*callback) (struct dl_phdr_info *info,
+                           size_t size, void *data),
+          void *data);
+#endif
+
+static int
+dl_iterate_callback(struct dl_phdr_info *dl_info, size_t size, void *data)
+{
+  SharedLibraryInfo& info = *reinterpret_cast<SharedLibraryInfo*>(data);
+
+  if (dl_info->dlpi_phnum <= 0)
+    return 0;
+
+  unsigned long libStart = -1;
+  unsigned long libEnd = 0;
+
+  for (size_t i = 0; i < dl_info->dlpi_phnum; i++) {
+    if (dl_info->dlpi_phdr[i].p_type != PT_LOAD) {
+      continue;
+    }
+    unsigned long start = dl_info->dlpi_addr + dl_info->dlpi_phdr[i].p_vaddr;
+    unsigned long end = start + dl_info->dlpi_phdr[i].p_memsz;
+    if (start < libStart)
+      libStart = start;
+    if (end > libEnd)
+      libEnd = end;
+  }
+  const char *name = dl_info->dlpi_name;
+  SharedLibrary shlib(libStart, libEnd, 0, getId(name), name);
+  info.AddSharedLibrary(shlib);
+
+  return 0;
+}
+
+#endif // !MOZ_WIDGET_GONK
+
+SharedLibraryInfo SharedLibraryInfo::GetInfoForSelf()
+{
+  SharedLibraryInfo info;
+
+#if !defined(MOZ_WIDGET_GONK)
+#ifdef ANDROID
+  if (!dl_iterate_phdr) {
+    // On ARM Android, dl_iterate_phdr is provided by the custom linker.
+    // So if libxul was loaded by the system linker (e.g. as part of
+    // xpcshell when running tests), it won't be available and we should
+    // not call it.
+    return info;
+  }
+#endif // ANDROID
+
+  dl_iterate_phdr(dl_iterate_callback, &info);
+#endif // !MOZ_WIDGET_GONK
+
+#if defined(ANDROID) || defined(MOZ_WIDGET_GONK)
+  pid_t pid = getpid();
+  char path[PATH_MAX];
+  snprintf(path, PATH_MAX, "/proc/%d/maps", pid);
+  std::ifstream maps(path);
+  std::string line;
+  int count = 0;
+  while (std::getline(maps, line)) {
+    int ret;
+    //XXX: needs input sanitizing
+    unsigned long start;
+    unsigned long end;
+    char perm[6] = "";
+    unsigned long offset;
+    char name[PATH_MAX] = "";
+    ret = sscanf(line.c_str(),
+                 "%lx-%lx %6s %lx %*s %*x %" PATH_MAX_STRING(PATH_MAX) "s\n",
+                 &start, &end, perm, &offset, name);
+    if (!strchr(perm, 'x')) {
+      // Ignore non executable entries
+      continue;
+    }
+    if (ret != 5 && ret != 4) {
+      LOG("Get maps line failed");
+      continue;
+    }
+#if defined(ANDROID) && !defined(MOZ_WIDGET_GONK)
+    // Use proc/pid/maps to get the dalvik-jit section since it has
+    // no associated phdrs
+    if (strcmp(name, "/dev/ashmem/dalvik-jit-code-cache") != 0)
+      continue;
+#else
+    if (strcmp(perm, "r-xp") != 0) {
+      // Ignore entries that are writable and/or shared.
+      // At least one graphics driver uses short-lived "rwxs" mappings
+      // (see bug 926734 comment 5), so just checking for 'x' isn't enough.
+      continue;
+    }
+#endif
+    SharedLibrary shlib(start, end, offset, getId(name), name);
+    info.AddSharedLibrary(shlib);
+    if (count > 10000) {
+      LOG("Get maps failed");
+      break;
+    }
+    count++;
+  }
+#endif // ANDROID || MOZ_WIDGET_GONK
+
+  return info;
+}
diff --git a/tools/profiler/core/shared-libraries-macos.cc b/tools/profiler/core/shared-libraries-macos.cc
new file mode 100644
index 000000000..e218d2280
--- /dev/null
+++ b/tools/profiler/core/shared-libraries-macos.cc
@@ -0,0 +1,132 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <AvailabilityMacros.h>
+#include <mach-o/loader.h>
+#include <mach-o/dyld_images.h>
+#include <mach/task_info.h>
+#include <mach/task.h>
+#include <mach/mach_init.h>
+#include <mach/mach_traps.h>
+#include <string.h>
+#include <stdlib.h>
+#include <vector>
+#include <sstream>
+
+#include "shared-libraries.h"
+
+#ifndef MAC_OS_X_VERSION_10_6
+#define MAC_OS_X_VERSION_10_6 1060
+#endif
+
+#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6
+// borrowed from Breakpad
+// Fallback declarations for TASK_DYLD_INFO and friends, introduced in
+// <mach/task_info.h> in the Mac OS X 10.6 SDK.
+#define TASK_DYLD_INFO 17
+struct task_dyld_info {
+    mach_vm_address_t all_image_info_addr;
+    mach_vm_size_t all_image_info_size;
+  };
+typedef struct task_dyld_info task_dyld_info_data_t;
+typedef struct task_dyld_info *task_dyld_info_t;
+#define TASK_DYLD_INFO_COUNT (sizeof(task_dyld_info_data_t) / sizeof(natural_t))
+
+#endif
+
+// Architecture specific abstraction.
+#ifdef __i386__
+typedef mach_header platform_mach_header;
+typedef segment_command mach_segment_command_type;
+#define MACHO_MAGIC_NUMBER MH_MAGIC
+#define CMD_SEGMENT LC_SEGMENT
+#define seg_size uint32_t
+#else
+typedef mach_header_64 platform_mach_header;
+typedef segment_command_64 mach_segment_command_type;
+#define MACHO_MAGIC_NUMBER MH_MAGIC_64
+#define CMD_SEGMENT LC_SEGMENT_64
+#define seg_size uint64_t
+#endif
+
+static
+void addSharedLibrary(const platform_mach_header* header, char *name, SharedLibraryInfo &info) {
+  const struct load_command *cmd =
+    reinterpret_cast<const struct load_command *>(header + 1);
+
+  seg_size size = 0;
+  unsigned long long start = reinterpret_cast<unsigned long long>(header);
+  // Find the cmd segment in the macho image. It will contain the offset we care about.
+  const uint8_t *uuid_bytes = nullptr;
+  for (unsigned int i = 0;
+       cmd && (i < header->ncmds) && (uuid_bytes == nullptr || size == 0);
+       ++i) {
+    if (cmd->cmd == CMD_SEGMENT) {
+      const mach_segment_command_type *seg =
+        reinterpret_cast<const mach_segment_command_type *>(cmd);
+
+      if (!strcmp(seg->segname, "__TEXT")) {
+        size = seg->vmsize;
+      }
+    } else if (cmd->cmd == LC_UUID) {
+      const uuid_command *ucmd = reinterpret_cast<const uuid_command *>(cmd);
+      uuid_bytes = ucmd->uuid;
+    }
+
+    cmd = reinterpret_cast<const struct load_command *>
+      (reinterpret_cast<const char *>(cmd) + cmd->cmdsize);
+  }
+
+  std::stringstream uuid;
+  uuid << std::hex << std::uppercase;
+  if (uuid_bytes != nullptr) {
+    for (int i = 0; i < 16; ++i) {
+      uuid << ((uuid_bytes[i] & 0xf0) >> 4);
+      uuid << (uuid_bytes[i] & 0xf);
+    }
+    uuid << '0';
+  }
+
+  info.AddSharedLibrary(SharedLibrary(start, start + size, 0, uuid.str(),
+                                      name));
+}
+
+// Use dyld to inspect the macho image information. We can build the SharedLibraryEntry structure
+// giving us roughtly the same info as /proc/PID/maps in Linux.
+SharedLibraryInfo SharedLibraryInfo::GetInfoForSelf()
+{
+  SharedLibraryInfo sharedLibraryInfo;
+
+  task_dyld_info_data_t task_dyld_info;
+  mach_msg_type_number_t count = TASK_DYLD_INFO_COUNT;
+  if (task_info(mach_task_self (), TASK_DYLD_INFO, (task_info_t)&task_dyld_info,
+                &count) != KERN_SUCCESS) {
+    return sharedLibraryInfo;
+  }
+
+  struct dyld_all_image_infos* aii = (struct dyld_all_image_infos*)task_dyld_info.all_image_info_addr;
+  size_t infoCount = aii->infoArrayCount;
+
+  // Iterate through all dyld images (loaded libraries) to get their names
+  // and offests.
+  for (size_t i = 0; i < infoCount; ++i) {
+    const dyld_image_info *info = &aii->infoArray[i];
+
+    // If the magic number doesn't match then go no further
+    // since we're not pointing to where we think we are.
+    if (info->imageLoadAddress->magic != MACHO_MAGIC_NUMBER) {
+      continue;
+    }
+
+    const platform_mach_header* header =
+      reinterpret_cast<const platform_mach_header*>(info->imageLoadAddress);
+
+    // Add the entry for this image.
+    addSharedLibrary(header, (char*)info->imageFilePath, sharedLibraryInfo);
+
+  }
+  return sharedLibraryInfo;
+}
+
diff --git a/tools/profiler/core/shared-libraries-win32.cc b/tools/profiler/core/shared-libraries-win32.cc
new file mode 100644
index 000000000..e2db2579b
--- /dev/null
+++ b/tools/profiler/core/shared-libraries-win32.cc
@@ -0,0 +1,137 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <windows.h>
+#include <tlhelp32.h>
+#include <dbghelp.h>
+#include <sstream>
+
+#include "shared-libraries.h"
+#include "nsWindowsHelpers.h"
+
+#define CV_SIGNATURE 0x53445352 // 'SDSR'
+
+struct CodeViewRecord70
+{
+  uint32_t signature;
+  GUID pdbSignature;
+  uint32_t pdbAge;
+  char pdbFileName[1];
+};
+
+static bool GetPdbInfo(uintptr_t aStart, nsID& aSignature, uint32_t& aAge, char** aPdbName)
+{
+  if (!aStart) {
+    return false;
+  }
+
+  PIMAGE_DOS_HEADER dosHeader = reinterpret_cast<PIMAGE_DOS_HEADER>(aStart);
+  if (dosHeader->e_magic != IMAGE_DOS_SIGNATURE) {
+    return false;
+  }
+
+  PIMAGE_NT_HEADERS ntHeaders = reinterpret_cast<PIMAGE_NT_HEADERS>(
+      aStart + dosHeader->e_lfanew);
+  if (ntHeaders->Signature != IMAGE_NT_SIGNATURE) {
+    return false;
+  }
+
+  uint32_t relativeVirtualAddress =
+    ntHeaders->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG].VirtualAddress;
+  if (!relativeVirtualAddress) {
+    return false;
+  }
+
+  PIMAGE_DEBUG_DIRECTORY debugDirectory =
+    reinterpret_cast<PIMAGE_DEBUG_DIRECTORY>(aStart + relativeVirtualAddress);
+  if (!debugDirectory || debugDirectory->Type != IMAGE_DEBUG_TYPE_CODEVIEW) {
+    return false;
+  }
+
+  CodeViewRecord70 *debugInfo = reinterpret_cast<CodeViewRecord70 *>(
+      aStart + debugDirectory->AddressOfRawData);
+  if (!debugInfo || debugInfo->signature != CV_SIGNATURE) {
+    return false;
+  }
+
+  aAge = debugInfo->pdbAge;
+  GUID& pdbSignature = debugInfo->pdbSignature;
+  aSignature.m0 = pdbSignature.Data1;
+  aSignature.m1 = pdbSignature.Data2;
+  aSignature.m2 = pdbSignature.Data3;
+  memcpy(aSignature.m3, pdbSignature.Data4, sizeof(pdbSignature.Data4));
+
+  // The PDB file name could be different from module filename, so report both
+  // e.g. The PDB for C:\Windows\SysWOW64\ntdll.dll is wntdll.pdb
+  char * leafName = strrchr(debugInfo->pdbFileName, '\\');
+  if (leafName) {
+    // Only report the file portion of the path
+    *aPdbName = leafName + 1;
+  } else {
+    *aPdbName = debugInfo->pdbFileName;
+  }
+
+  return true;
+}
+
+static bool IsDashOrBraces(char c)
+{
+  return c == '-' || c == '{' || c == '}';
+}
+
+SharedLibraryInfo SharedLibraryInfo::GetInfoForSelf()
+{
+  SharedLibraryInfo sharedLibraryInfo;
+
+  nsAutoHandle snap(CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, GetCurrentProcessId()));
+
+  MODULEENTRY32 module = {0};
+  module.dwSize = sizeof(MODULEENTRY32);
+  if (Module32First(snap, &module)) {
+    do {
+      nsID pdbSig;
+      uint32_t pdbAge;
+      char *pdbName = NULL;
+
+      // Load the module again to make sure that its handle will remain remain
+      // valid as we attempt to read the PDB information from it.  We load the
+      // DLL as a datafile so that if the module actually gets unloaded between
+      // the call to Module32Next and the following LoadLibraryEx, we don't end
+      // up running the now newly loaded module's DllMain function.  If the
+      // module is already loaded, LoadLibraryEx just increments its refcount.
+      //
+      // Note that because of the race condition above, merely loading the DLL
+      // again is not safe enough, therefore we also need to make sure that we
+      // can read the memory mapped at the base address before we can safely
+      // proceed to actually access those pages.
+      HMODULE handleLock = LoadLibraryEx(module.szExePath, NULL, LOAD_LIBRARY_AS_DATAFILE);
+      MEMORY_BASIC_INFORMATION vmemInfo = {0};
+      if (handleLock &&
+          sizeof(vmemInfo) == VirtualQuery(module.modBaseAddr, &vmemInfo, sizeof(vmemInfo)) &&
+          vmemInfo.State == MEM_COMMIT &&
+          GetPdbInfo((uintptr_t)module.modBaseAddr, pdbSig, pdbAge, &pdbName)) {
+        std::ostringstream stream;
+        stream << pdbSig.ToString() << std::hex << pdbAge;
+        std::string breakpadId = stream.str();
+        std::string::iterator end =
+          std::remove_if(breakpadId.begin(), breakpadId.end(), IsDashOrBraces);
+        breakpadId.erase(end, breakpadId.end());
+        std::transform(breakpadId.begin(), breakpadId.end(),
+                       breakpadId.begin(), toupper);
+
+        SharedLibrary shlib((uintptr_t)module.modBaseAddr,
+                            (uintptr_t)module.modBaseAddr+module.modBaseSize,
+                            0, // DLLs are always mapped at offset 0 on Windows
+                            breakpadId,
+                            pdbName);
+        sharedLibraryInfo.AddSharedLibrary(shlib);
+      }
+      FreeLibrary(handleLock); // ok to free null handles
+    } while (Module32Next(snap, &module));
+  }
+
+  return sharedLibraryInfo;
+}
+
diff --git a/tools/profiler/core/v8-support.h b/tools/profiler/core/v8-support.h
new file mode 100644
index 000000000..391069dcc
--- /dev/null
+++ b/tools/profiler/core/v8-support.h
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* This contains stubs and infrastructure to support code from v8 */
+
+#ifndef V8_SUPPORT_H_
+#define V8_SUPPORT_H_
+
+#if defined(_M_X64) || defined(__x86_64__)
+#define V8_HOST_ARCH_X64 1
+#elif defined(_M_IX86) || defined(__i386__) || defined(__i386)
+#define V8_HOST_ARCH_IA32 1
+#elif defined(__ARMEL__)
+#define V8_HOST_ARCH_ARM 1
+#else
+#warning Please add support for your architecture in chromium_types.h
+#endif
+
+typedef int32_t Atomic32;
+
+#if defined(V8_HOST_ARCH_X64) || defined(V8_HOST_ARCH_IA32) || defined(V8_HOST_ARCH_ARM)
+inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
+  *ptr = value;
+}
+#endif
+
+
+const int kMaxInt = 0x7FFFFFFF;
+const int kMinInt = -kMaxInt - 1;
+
+// A macro to disallow the evil copy constructor and operator= functions
+// This should be used in the private: declarations for a class
+#define DISALLOW_COPY_AND_ASSIGN(TypeName)      \
+  TypeName(const TypeName&);                    \
+  void operator=(const TypeName&)
+
+
+// The USE(x) template is used to silence C++ compiler warnings
+// issued for (yet) unused variables (typically parameters).
+template <typename T>
+static inline void USE(T) { }
+
+class Malloced {
+};
+
+#endif // V8_SUPPORT_H_