Add m-esr52 at 52.6.0

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diff --git a/toolkit/crashreporter/google-breakpad/src/common/test_assembler.h b/toolkit/crashreporter/google-breakpad/src/common/test_assembler.h
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+// -*- mode: C++ -*-
+
+// Copyright (c) 2010, Google Inc.
+// 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.
+
+// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
+
+// test-assembler.h: interface to class for building complex binary streams.
+
+// To test the Breakpad symbol dumper and processor thoroughly, for
+// all combinations of host system and minidump processor
+// architecture, we need to be able to easily generate complex test
+// data like debugging information and minidump files.
+// 
+// For example, if we want our unit tests to provide full code
+// coverage for stack walking, it may be difficult to persuade the
+// compiler to generate every possible sort of stack walking
+// information that we want to support; there are probably DWARF CFI
+// opcodes that GCC never emits. Similarly, if we want to test our
+// error handling, we will need to generate damaged minidumps or
+// debugging information that (we hope) the client or compiler will
+// never produce on its own.
+//
+// google_breakpad::TestAssembler provides a predictable and
+// (relatively) simple way to generate complex formatted data streams
+// like minidumps and CFI. Furthermore, because TestAssembler is
+// portable, developers without access to (say) Visual Studio or a
+// SPARC assembler can still work on test data for those targets.
+
+#ifndef PROCESSOR_TEST_ASSEMBLER_H_
+#define PROCESSOR_TEST_ASSEMBLER_H_
+
+#include <list>
+#include <vector>
+#include <string>
+
+#include "common/using_std_string.h"
+#include "google_breakpad/common/breakpad_types.h"
+
+namespace google_breakpad {
+
+using std::list;
+using std::vector;
+
+namespace test_assembler {
+
+// A Label represents a value not yet known that we need to store in a
+// section. As long as all the labels a section refers to are defined
+// by the time we retrieve its contents as bytes, we can use undefined
+// labels freely in that section's construction.
+//
+// A label can be in one of three states:
+// - undefined,
+// - defined as the sum of some other label and a constant, or
+// - a constant.
+// 
+// A label's value never changes, but it can accumulate constraints.
+// Adding labels and integers is permitted, and yields a label.
+// Subtracting a constant from a label is permitted, and also yields a
+// label. Subtracting two labels that have some relationship to each
+// other is permitted, and yields a constant.
+//
+// For example:
+//
+//   Label a;               // a's value is undefined
+//   Label b;               // b's value is undefined
+//   {
+//     Label c = a + 4;     // okay, even though a's value is unknown
+//     b = c + 4;           // also okay; b is now a+8
+//   }
+//   Label d = b - 2;       // okay; d == a+6, even though c is gone
+//   d.Value();             // error: d's value is not yet known
+//   d - a;                 // is 6, even though their values are not known
+//   a = 12;                // now b == 20, and d == 18
+//   d.Value();             // 18: no longer an error
+//   b.Value();             // 20
+//   d = 10;                // error: d is already defined.
+//
+// Label objects' lifetimes are unconstrained: notice that, in the
+// above example, even though a and b are only related through c, and
+// c goes out of scope, the assignment to a sets b's value as well. In
+// particular, it's not necessary to ensure that a Label lives beyond
+// Sections that refer to it.
+class Label {
+ public:
+  Label();                      // An undefined label.
+  Label(uint64_t value);       // A label with a fixed value
+  Label(const Label &value);    // A label equal to another.
+  ~Label();
+
+  // Return this label's value; it must be known.
+  //
+  // Providing this as a cast operator is nifty, but the conversions
+  // happen in unexpected places. In particular, ISO C++ says that
+  // Label + size_t becomes ambigious, because it can't decide whether
+  // to convert the Label to a uint64_t and then to a size_t, or use
+  // the overloaded operator that returns a new label, even though the
+  // former could fail if the label is not yet defined and the latter won't.
+  uint64_t Value() const;
+
+  Label &operator=(uint64_t value);
+  Label &operator=(const Label &value);
+  Label operator+(uint64_t addend) const;
+  Label operator-(uint64_t subtrahend) const;
+  uint64_t operator-(const Label &subtrahend) const;
+
+  // We could also provide == and != that work on undefined, but
+  // related, labels.
+
+  // Return true if this label's value is known. If VALUE_P is given,
+  // set *VALUE_P to the known value if returning true.
+  bool IsKnownConstant(uint64_t *value_p = NULL) const;
+
+  // Return true if the offset from LABEL to this label is known. If
+  // OFFSET_P is given, set *OFFSET_P to the offset when returning true.
+  //
+  // You can think of l.KnownOffsetFrom(m, &d) as being like 'd = l-m',
+  // except that it also returns a value indicating whether the
+  // subtraction is possible given what we currently know of l and m.
+  // It can be possible even if we don't know l and m's values. For
+  // example:
+  // 
+  //   Label l, m;
+  //   m = l + 10;
+  //   l.IsKnownConstant();             // false
+  //   m.IsKnownConstant();             // false
+  //   uint64_t d;                     
+  //   l.IsKnownOffsetFrom(m, &d);      // true, and sets d to -10.
+  //   l-m                              // -10
+  //   m-l                              // 10
+  //   m.Value()                        // error: m's value is not known
+  bool IsKnownOffsetFrom(const Label &label, uint64_t *offset_p = NULL) const;
+
+ private:
+  // A label's value, or if that is not yet known, how the value is
+  // related to other labels' values. A binding may be:
+  // - a known constant,
+  // - constrained to be equal to some other binding plus a constant, or
+  // - unconstrained, and free to take on any value.
+  //
+  // Many labels may point to a single binding, and each binding may
+  // refer to another, so bindings and labels form trees whose leaves
+  // are labels, whose interior nodes (and roots) are bindings, and
+  // where links point from children to parents. Bindings are
+  // reference counted, allowing labels to be lightweight, copyable,
+  // assignable, placed in containers, and so on.
+  class Binding {
+   public:
+    Binding();
+    Binding(uint64_t addend);
+    ~Binding();
+
+    // Increment our reference count.
+    void Acquire() { reference_count_++; };
+    // Decrement our reference count, and return true if it is zero.
+    bool Release() { return --reference_count_ == 0; }
+
+    // Set this binding to be equal to BINDING + ADDEND. If BINDING is
+    // NULL, then set this binding to the known constant ADDEND.
+    // Update every binding on this binding's chain to point directly
+    // to BINDING, or to be a constant, with addends adjusted
+    // appropriately.
+    void Set(Binding *binding, uint64_t value);
+
+    // Return what we know about the value of this binding.
+    // - If this binding's value is a known constant, set BASE to
+    //   NULL, and set ADDEND to its value.
+    // - If this binding is not a known constant but related to other
+    //   bindings, set BASE to the binding at the end of the relation
+    //   chain (which will always be unconstrained), and set ADDEND to the
+    //   value to add to that binding's value to get this binding's
+    //   value.
+    // - If this binding is unconstrained, set BASE to this, and leave
+    //   ADDEND unchanged.
+    void Get(Binding **base, uint64_t *addend);
+
+   private:
+    // There are three cases:
+    //
+    // - A binding representing a known constant value has base_ NULL,
+    //   and addend_ equal to the value.
+    //
+    // - A binding representing a completely unconstrained value has
+    //   base_ pointing to this; addend_ is unused.
+    //
+    // - A binding whose value is related to some other binding's
+    //   value has base_ pointing to that other binding, and addend_
+    //   set to the amount to add to that binding's value to get this
+    //   binding's value. We only represent relationships of the form
+    //   x = y+c.
+    //
+    // Thus, the bind_ links form a chain terminating in either a
+    // known constant value or a completely unconstrained value. Most
+    // operations on bindings do path compression: they change every
+    // binding on the chain to point directly to the final value,
+    // adjusting addends as appropriate.
+    Binding *base_;
+    uint64_t addend_;
+
+    // The number of Labels and Bindings pointing to this binding.
+    // (When a binding points to itself, indicating a completely
+    // unconstrained binding, that doesn't count as a reference.)
+    int reference_count_;
+  };
+
+  // This label's value.
+  Binding *value_;
+};
+
+inline Label operator+(uint64_t a, const Label &l) { return l + a; }
+// Note that int-Label isn't defined, as negating a Label is not an
+// operation we support.
+
+// Conventions for representing larger numbers as sequences of bytes.
+enum Endianness {
+  kBigEndian,        // Big-endian: the most significant byte comes first.
+  kLittleEndian,     // Little-endian: the least significant byte comes first.
+  kUnsetEndian,      // used internally
+};
+ 
+// A section is a sequence of bytes, constructed by appending bytes
+// to the end. Sections have a convenient and flexible set of member
+// functions for appending data in various formats: big-endian and
+// little-endian signed and unsigned values of different sizes;
+// LEB128 and ULEB128 values (see below), and raw blocks of bytes.
+//
+// If you need to append a value to a section that is not convenient
+// to compute immediately, you can create a label, append the
+// label's value to the section, and then set the label's value
+// later, when it's convenient to do so. Once a label's value is
+// known, the section class takes care of updating all previously
+// appended references to it.
+//
+// Once all the labels to which a section refers have had their
+// values determined, you can get a copy of the section's contents
+// as a string.
+//
+// Note that there is no specified "start of section" label. This is
+// because there are typically several different meanings for "the
+// start of a section": the offset of the section within an object
+// file, the address in memory at which the section's content appear,
+// and so on. It's up to the code that uses the Section class to 
+// keep track of these explicitly, as they depend on the application.
+class Section {
+ public:
+  Section(Endianness endianness = kUnsetEndian)
+      : endianness_(endianness) { };
+
+  // A base class destructor should be either public and virtual,
+  // or protected and nonvirtual.
+  virtual ~Section() { };
+
+  // Set the default endianness of this section to ENDIANNESS. This
+  // sets the behavior of the D<N> appending functions. If the
+  // assembler's default endianness was set, this is the 
+  void set_endianness(Endianness endianness) {
+    endianness_ = endianness;
+  }
+
+  // Return the default endianness of this section.
+  Endianness endianness() const { return endianness_; }
+
+  // Append the SIZE bytes at DATA or the contents of STRING to the
+  // end of this section. Return a reference to this section.
+  Section &Append(const uint8_t *data, size_t size) {
+    contents_.append(reinterpret_cast<const char *>(data), size);
+    return *this;
+  };
+  Section &Append(const string &data) {
+    contents_.append(data);
+    return *this;
+  };
+
+  // Append SIZE copies of BYTE to the end of this section. Return a
+  // reference to this section.
+  Section &Append(size_t size, uint8_t byte) {
+    contents_.append(size, (char) byte);
+    return *this;
+  }
+      
+  // Append NUMBER to this section. ENDIANNESS is the endianness to
+  // use to write the number. SIZE is the length of the number in
+  // bytes. Return a reference to this section.
+  Section &Append(Endianness endianness, size_t size, uint64_t number);
+  Section &Append(Endianness endianness, size_t size, const Label &label);
+
+  // Append SECTION to the end of this section. The labels SECTION
+  // refers to need not be defined yet.
+  //
+  // Note that this has no effect on any Labels' values, or on
+  // SECTION. If placing SECTION within 'this' provides new
+  // constraints on existing labels' values, then it's up to the
+  // caller to fiddle with those labels as needed.
+  Section &Append(const Section &section);
+
+  // Append the contents of DATA as a series of bytes terminated by
+  // a NULL character.
+  Section &AppendCString(const string &data) {
+    Append(data);
+    contents_ += '\0';
+    return *this;
+  }
+
+  // Append at most SIZE bytes from DATA; if DATA is less than SIZE bytes
+  // long, pad with '\0' characters.
+  Section &AppendCString(const string &data, size_t size) {
+    contents_.append(data, 0, size);
+    if (data.size() < size)
+      Append(size - data.size(), 0);
+    return *this;
+  }
+
+  // Append VALUE or LABEL to this section, with the given bit width and
+  // endianness. Return a reference to this section.
+  //
+  // The names of these functions have the form <ENDIANNESS><BITWIDTH>:
+  // <ENDIANNESS> is either 'L' (little-endian, least significant byte first),
+  //                        'B' (big-endian, most significant byte first), or
+  //                        'D' (default, the section's default endianness)
+  // <BITWIDTH> is 8, 16, 32, or 64.
+  //
+  // Since endianness doesn't matter for a single byte, all the
+  // <BITWIDTH>=8 functions are equivalent.
+  //
+  // These can be used to write both signed and unsigned values, as
+  // the compiler will properly sign-extend a signed value before
+  // passing it to the function, at which point the function's
+  // behavior is the same either way.
+  Section &L8(uint8_t value) { contents_ += value; return *this; }
+  Section &B8(uint8_t value) { contents_ += value; return *this; }
+  Section &D8(uint8_t value) { contents_ += value; return *this; }
+  Section &L16(uint16_t), &L32(uint32_t), &L64(uint64_t),
+          &B16(uint16_t), &B32(uint32_t), &B64(uint64_t),
+          &D16(uint16_t), &D32(uint32_t), &D64(uint64_t);
+  Section &L8(const Label &label),  &L16(const Label &label),
+          &L32(const Label &label), &L64(const Label &label),
+          &B8(const Label &label),  &B16(const Label &label),
+          &B32(const Label &label), &B64(const Label &label),
+          &D8(const Label &label),  &D16(const Label &label),
+          &D32(const Label &label), &D64(const Label &label);
+
+  // Append VALUE in a signed LEB128 (Little-Endian Base 128) form.
+  // 
+  // The signed LEB128 representation of an integer N is a variable
+  // number of bytes:
+  //
+  // - If N is between -0x40 and 0x3f, then its signed LEB128
+  //   representation is a single byte whose value is N.
+  // 
+  // - Otherwise, its signed LEB128 representation is (N & 0x7f) |
+  //   0x80, followed by the signed LEB128 representation of N / 128,
+  //   rounded towards negative infinity.
+  //
+  // In other words, we break VALUE into groups of seven bits, put
+  // them in little-endian order, and then write them as eight-bit
+  // bytes with the high bit on all but the last.
+  //
+  // Note that VALUE cannot be a Label (we would have to implement
+  // relaxation).
+  Section &LEB128(long long value);
+
+  // Append VALUE in unsigned LEB128 (Little-Endian Base 128) form.
+  // 
+  // The unsigned LEB128 representation of an integer N is a variable
+  // number of bytes:
+  //
+  // - If N is between 0 and 0x7f, then its unsigned LEB128
+  //   representation is a single byte whose value is N.
+  // 
+  // - Otherwise, its unsigned LEB128 representation is (N & 0x7f) |
+  //   0x80, followed by the unsigned LEB128 representation of N /
+  //   128, rounded towards negative infinity.
+  //
+  // Note that VALUE cannot be a Label (we would have to implement
+  // relaxation).
+  Section &ULEB128(uint64_t value);
+
+  // Jump to the next location aligned on an ALIGNMENT-byte boundary,
+  // relative to the start of the section. Fill the gap with PAD_BYTE.
+  // ALIGNMENT must be a power of two. Return a reference to this
+  // section.
+  Section &Align(size_t alignment, uint8_t pad_byte = 0);
+
+  // Clear the contents of this section.
+  void Clear();
+
+  // Return the current size of the section.
+  size_t Size() const { return contents_.size(); }
+
+  // Return a label representing the start of the section.
+  // 
+  // It is up to the user whether this label represents the section's
+  // position in an object file, the section's address in memory, or
+  // what have you; some applications may need both, in which case
+  // this simple-minded interface won't be enough. This class only
+  // provides a single start label, for use with the Here and Mark
+  // member functions.
+  //
+  // Ideally, we'd provide this in a subclass that actually knows more
+  // about the application at hand and can provide an appropriate
+  // collection of start labels. But then the appending member
+  // functions like Append and D32 would return a reference to the
+  // base class, not the derived class, and the chaining won't work.
+  // Since the only value here is in pretty notation, that's a fatal
+  // flaw.
+  Label start() const { return start_; }
+
+  // Return a label representing the point at which the next Appended
+  // item will appear in the section, relative to start().
+  Label Here() const { return start_ + Size(); }
+
+  // Set *LABEL to Here, and return a reference to this section.
+  Section &Mark(Label *label) { *label = Here(); return *this; }
+
+  // If there are no undefined label references left in this
+  // section, set CONTENTS to the contents of this section, as a
+  // string, and clear this section. Return true on success, or false
+  // if there were still undefined labels.
+  bool GetContents(string *contents);
+
+ private:
+  // Used internally. A reference to a label's value.
+  struct Reference {
+    Reference(size_t set_offset, Endianness set_endianness,  size_t set_size,
+              const Label &set_label)
+        : offset(set_offset), endianness(set_endianness), size(set_size),
+          label(set_label) { }
+      
+    // The offset of the reference within the section.
+    size_t offset;
+
+    // The endianness of the reference.
+    Endianness endianness;
+
+    // The size of the reference.
+    size_t size;
+
+    // The label to which this is a reference.
+    Label label;
+  };
+
+  // The default endianness of this section.
+  Endianness endianness_;
+
+  // The contents of the section.
+  string contents_;
+  
+  // References to labels within those contents.
+  vector<Reference> references_;
+
+  // A label referring to the beginning of the section.
+  Label start_;
+};
+
+}  // namespace test_assembler
+}  // namespace google_breakpad
+
+#endif  // PROCESSOR_TEST_ASSEMBLER_H_