Remove SPS profiler.

- Conditionals and code blocks. (MOZ_ENABLE_PROFILER_SPS)
- Stub out several profiler-only functions.

1 files changed, 0 insertions, 469 deletions

diff --git a/tools/profiler/public/PseudoStack.h b/tools/profiler/public/PseudoStack.h
deleted file mode 100644
index f9e3836ea..000000000
--- a/tools/profiler/public/PseudoStack.h
+++ /dev/null
@@ -1,469 +0,0 @@
-/* -*- 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 PROFILER_PSEUDO_STACK_H_
-#define PROFILER_PSEUDO_STACK_H_
-
-#include "mozilla/ArrayUtils.h"
-#include <stdint.h>
-#include "js/ProfilingStack.h"
-#include <stdlib.h>
-#include "mozilla/Atomics.h"
-#ifndef SPS_STANDALONE
-#include "nsISupportsImpl.h"
-#endif
-
-/* we duplicate this code here to avoid header dependencies
- * which make it more difficult to include in other places */
-#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
-
-// STORE_SEQUENCER: Because signals can interrupt our profile modification
-//                  we need to make stores are not re-ordered by the compiler
-//                  or hardware to make sure the profile is consistent at
-//                  every point the signal can fire.
-#ifdef V8_HOST_ARCH_ARM
-// TODO Is there something cheaper that will prevent
-//      memory stores from being reordered
-
-typedef void (*LinuxKernelMemoryBarrierFunc)(void);
-LinuxKernelMemoryBarrierFunc pLinuxKernelMemoryBarrier __attribute__((weak)) =
-    (LinuxKernelMemoryBarrierFunc) 0xffff0fa0;
-
-# define STORE_SEQUENCER() pLinuxKernelMemoryBarrier()
-#elif defined(V8_HOST_ARCH_IA32) || defined(V8_HOST_ARCH_X64)
-# if defined(_MSC_VER)
-#  include <intrin.h>
-#  define STORE_SEQUENCER() _ReadWriteBarrier();
-# elif defined(__INTEL_COMPILER)
-#  define STORE_SEQUENCER() __memory_barrier();
-# elif __GNUC__
-#  define STORE_SEQUENCER() asm volatile("" ::: "memory");
-# else
-#  error "Memory clobber not supported for your compiler."
-# endif
-#else
-# error "Memory clobber not supported for your platform."
-#endif
-
-// We can't include <algorithm> because it causes issues on OS X, so we use
-// our own min function.
-static inline uint32_t sMin(uint32_t l, uint32_t r) {
-  return l < r ? l : r;
-}
-
-// A stack entry exists to allow the JS engine to inform SPS of the current
-// backtrace, but also to instrument particular points in C++ in case stack
-// walking is not available on the platform we are running on.
-//
-// Each entry has a descriptive string, a relevant stack address, and some extra
-// information the JS engine might want to inform SPS of. This class inherits
-// from the JS engine's version of the entry to ensure that the size and layout
-// of the two representations are consistent.
-class StackEntry : public js::ProfileEntry
-{
-};
-
-class ProfilerMarkerPayload;
-template<typename T>
-class ProfilerLinkedList;
-class SpliceableJSONWriter;
-class UniqueStacks;
-
-class ProfilerMarker {
-  friend class ProfilerLinkedList<ProfilerMarker>;
-public:
-  explicit ProfilerMarker(const char* aMarkerName,
-                          ProfilerMarkerPayload* aPayload = nullptr,
-                          double aTime = 0);
-
-  ~ProfilerMarker();
-
-  const char* GetMarkerName() const {
-    return mMarkerName;
-  }
-
-  void StreamJSON(SpliceableJSONWriter& aWriter, UniqueStacks& aUniqueStacks) const;
-
-  void SetGeneration(uint32_t aGenID);
-
-  bool HasExpired(uint32_t aGenID) const {
-    return mGenID + 2 <= aGenID;
-  }
-
-  double GetTime() const;
-
-private:
-  char* mMarkerName;
-  ProfilerMarkerPayload* mPayload;
-  ProfilerMarker* mNext;
-  double mTime;
-  uint32_t mGenID;
-};
-
-template<typename T>
-class ProfilerLinkedList {
-public:
-  ProfilerLinkedList()
-    : mHead(nullptr)
-    , mTail(nullptr)
-  {}
-
-  void insert(T* elem)
-  {
-    if (!mTail) {
-      mHead = elem;
-      mTail = elem;
-    } else {
-      mTail->mNext = elem;
-      mTail = elem;
-    }
-    elem->mNext = nullptr;
-  }
-
-  T* popHead()
-  {
-    if (!mHead) {
-      MOZ_ASSERT(false);
-      return nullptr;
-    }
-
-    T* head = mHead;
-
-    mHead = head->mNext;
-    if (!mHead) {
-      mTail = nullptr;
-    }
-
-    return head;
-  }
-
-  const T* peek() {
-    return mHead;
-  }
-
-private:
-  T* mHead;
-  T* mTail;
-};
-
-typedef ProfilerLinkedList<ProfilerMarker> ProfilerMarkerLinkedList;
-
-template<typename T>
-class ProfilerSignalSafeLinkedList {
-public:
-  ProfilerSignalSafeLinkedList()
-    : mSignalLock(false)
-  {}
-
-  ~ProfilerSignalSafeLinkedList()
-  {
-    if (mSignalLock) {
-      // Some thread is modifying the list. We should only be released on that
-      // thread.
-      abort();
-    }
-
-    while (mList.peek()) {
-      delete mList.popHead();
-    }
-  }
-
-  // Insert an item into the list.
-  // Must only be called from the owning thread.
-  // Must not be called while the list from accessList() is being accessed.
-  // In the profiler, we ensure that by interrupting the profiled thread
-  // (which is the one that owns this list and calls insert() on it) until
-  // we're done reading the list from the signal handler.
-  void insert(T* aElement) {
-    MOZ_ASSERT(aElement);
-
-    mSignalLock = true;
-    STORE_SEQUENCER();
-
-    mList.insert(aElement);
-
-    STORE_SEQUENCER();
-    mSignalLock = false;
-  }
-
-  // Called within signal, from any thread, possibly while insert() is in the
-  // middle of modifying the list (on the owning thread). Will return null if
-  // that is the case.
-  // Function must be reentrant.
-  ProfilerLinkedList<T>* accessList()
-  {
-    if (mSignalLock) {
-      return nullptr;
-    }
-    return &mList;
-  }
-
-private:
-  ProfilerLinkedList<T> mList;
-
-  // If this is set, then it's not safe to read the list because its contents
-  // are being changed.
-  volatile bool mSignalLock;
-};
-
-// Stub eventMarker function for js-engine event generation.
-void ProfilerJSEventMarker(const char *event);
-
-// the PseudoStack members are read by signal
-// handlers, so the mutation of them needs to be signal-safe.
-struct PseudoStack
-{
-public:
-  // Create a new PseudoStack and acquire a reference to it.
-  static PseudoStack *create()
-  {
-    return new PseudoStack();
-  }
-
-  // This is called on every profiler restart. Put things that should happen at that time here.
-  void reinitializeOnResume() {
-    // This is needed to cause an initial sample to be taken from sleeping threads. Otherwise sleeping
-    // threads would not have any samples to copy forward while sleeping.
-    mSleepId++;
-  }
-
-  void addMarker(const char* aMarkerStr, ProfilerMarkerPayload* aPayload, double aTime)
-  {
-    ProfilerMarker* marker = new ProfilerMarker(aMarkerStr, aPayload, aTime);
-    mPendingMarkers.insert(marker);
-  }
-
-  // called within signal. Function must be reentrant
-  ProfilerMarkerLinkedList* getPendingMarkers()
-  {
-    // The profiled thread is interrupted, so we can access the list safely.
-    // Unless the profiled thread was in the middle of changing the list when
-    // we interrupted it - in that case, accessList() will return null.
-    return mPendingMarkers.accessList();
-  }
-
-  void push(const char *aName, js::ProfileEntry::Category aCategory, uint32_t line)
-  {
-    push(aName, aCategory, nullptr, false, line);
-  }
-
-  void push(const char *aName, js::ProfileEntry::Category aCategory,
-    void *aStackAddress, bool aCopy, uint32_t line)
-  {
-    if (size_t(mStackPointer) >= mozilla::ArrayLength(mStack)) {
-      mStackPointer++;
-      return;
-    }
-
-    // In order to ensure this object is kept alive while it is
-    // active, we acquire a reference at the outermost push.  This is
-    // released by the corresponding pop.
-    if (mStackPointer == 0) {
-      ref();
-    }
-
-    volatile StackEntry &entry = mStack[mStackPointer];
-
-    // Make sure we increment the pointer after the name has
-    // been written such that mStack is always consistent.
-    entry.initCppFrame(aStackAddress, line);
-    entry.setLabel(aName);
-    MOZ_ASSERT(entry.flags() == js::ProfileEntry::IS_CPP_ENTRY);
-    entry.setCategory(aCategory);
-
-    // Track if mLabel needs a copy.
-    if (aCopy)
-      entry.setFlag(js::ProfileEntry::FRAME_LABEL_COPY);
-    else
-      entry.unsetFlag(js::ProfileEntry::FRAME_LABEL_COPY);
-
-    // Prevent the optimizer from re-ordering these instructions
-    STORE_SEQUENCER();
-    mStackPointer++;
-  }
-
-  // Pop the stack.  If the stack is empty and all other references to
-  // this PseudoStack have been dropped, then the PseudoStack is
-  // deleted and "false" is returned.  Otherwise "true" is returned.
-  bool popAndMaybeDelete()
-  {
-    mStackPointer--;
-    if (mStackPointer == 0) {
-      // Release our self-owned reference count.  See 'push'.
-      deref();
-      return false;
-    } else {
-      return true;
-    }
-  }
-  bool isEmpty()
-  {
-    return mStackPointer == 0;
-  }
-  uint32_t stackSize() const
-  {
-    return sMin(mStackPointer, mozilla::sig_safe_t(mozilla::ArrayLength(mStack)));
-  }
-
-  void sampleContext(JSContext* context) {
-#ifndef SPS_STANDALONE
-    if (mContext && !context) {
-      // On JS shut down, flush the current buffer as stringifying JIT samples
-      // requires a live JSContext.
-      flushSamplerOnJSShutdown();
-    }
-
-    mContext = context;
-
-    if (!context) {
-      return;
-    }
-
-    static_assert(sizeof(mStack[0]) == sizeof(js::ProfileEntry),
-                  "mStack must be binary compatible with js::ProfileEntry.");
-    js::SetContextProfilingStack(context,
-                                 (js::ProfileEntry*) mStack,
-                                 (uint32_t*) &mStackPointer,
-                                 (uint32_t) mozilla::ArrayLength(mStack));
-    if (mStartJSSampling)
-      enableJSSampling();
-#endif
-  }
-#ifndef SPS_STANDALONE
-  void enableJSSampling() {
-    if (mContext) {
-      js::EnableContextProfilingStack(mContext, true);
-      js::RegisterContextProfilingEventMarker(mContext, &ProfilerJSEventMarker);
-      mStartJSSampling = false;
-    } else {
-      mStartJSSampling = true;
-    }
-  }
-  void jsOperationCallback() {
-    if (mStartJSSampling)
-      enableJSSampling();
-  }
-  void disableJSSampling() {
-    mStartJSSampling = false;
-    if (mContext)
-      js::EnableContextProfilingStack(mContext, false);
-  }
-#endif
-
-  // Keep a list of active checkpoints
-  StackEntry volatile mStack[1024];
- private:
-
-  // A PseudoStack can only be created via the "create" method.
-  PseudoStack()
-    : mStackPointer(0)
-    , mSleepId(0)
-    , mSleepIdObserved(0)
-    , mSleeping(false)
-    , mRefCnt(1)
-#ifndef SPS_STANDALONE
-    , mContext(nullptr)
-#endif
-    , mStartJSSampling(false)
-    , mPrivacyMode(false)
-  {
-    MOZ_COUNT_CTOR(PseudoStack);
-  }
-
-  // A PseudoStack can only be deleted via deref.
-  ~PseudoStack() {
-    MOZ_COUNT_DTOR(PseudoStack);
-    if (mStackPointer != 0) {
-      // We're releasing the pseudostack while it's still in use.
-      // The label macros keep a non ref counted reference to the
-      // stack to avoid a TLS. If these are not all cleared we will
-      // get a use-after-free so better to crash now.
-      abort();
-    }
-  }
-
-  // No copying.
-  PseudoStack(const PseudoStack&) = delete;
-  void operator=(const PseudoStack&) = delete;
-
-  void flushSamplerOnJSShutdown();
-
-  // Keep a list of pending markers that must be moved
-  // to the circular buffer
-  ProfilerSignalSafeLinkedList<ProfilerMarker> mPendingMarkers;
-  // This may exceed the length of mStack, so instead use the stackSize() method
-  // to determine the number of valid samples in mStack
-  mozilla::sig_safe_t mStackPointer;
-  // Incremented at every sleep/wake up of the thread
-  int mSleepId;
-  // Previous id observed. If this is not the same as mSleepId, this thread is not sleeping in the same place any more
-  mozilla::Atomic<int> mSleepIdObserved;
-  // Keeps tack of whether the thread is sleeping or not (1 when sleeping 0 when awake)
-  mozilla::Atomic<int> mSleeping;
-  // This class is reference counted because it must be kept alive by
-  // the ThreadInfo, by the reference from tlsPseudoStack, and by the
-  // current thread when callbacks are in progress.
-  mozilla::Atomic<int> mRefCnt;
-
- public:
-#ifndef SPS_STANDALONE
-  // The context which is being sampled
-  JSContext *mContext;
-#endif
-  // Start JS Profiling when possible
-  bool mStartJSSampling;
-  bool mPrivacyMode;
-
-  enum SleepState {NOT_SLEEPING, SLEEPING_FIRST, SLEEPING_AGAIN};
-
-  // The first time this is called per sleep cycle we return SLEEPING_FIRST
-  // and any other subsequent call within the same sleep cycle we return SLEEPING_AGAIN
-  SleepState observeSleeping() {
-    if (mSleeping != 0) {
-      if (mSleepIdObserved == mSleepId) {
-        return SLEEPING_AGAIN;
-      } else {
-        mSleepIdObserved = mSleepId;
-        return SLEEPING_FIRST;
-      }
-    } else {
-      return NOT_SLEEPING;
-    }
-  }
-
-
-  // Call this whenever the current thread sleeps or wakes up
-  // Calling setSleeping with the same value twice in a row is an error
-  void setSleeping(int sleeping) {
-    MOZ_ASSERT(mSleeping != sleeping);
-    mSleepId++;
-    mSleeping = sleeping;
-  }
-
-  bool isSleeping() {
-    return !!mSleeping;
-  }
-
-  void ref() {
-    ++mRefCnt;
-  }
-
-  void deref() {
-    int newValue = --mRefCnt;
-    if (newValue == 0) {
-      delete this;
-    }
-  }
-};
-
-#endif