The Tor Browser: js/src/jit/AsmJSModule.h@129ffea94266 (annotated)

js/src/jit/AsmJSModule.h@129ffea94266 (annotated)

js/src/jit/AsmJSModule.h

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
  * vim: set ts=8 sts=4 et sw=4 tw=99:
  * 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 jit_AsmJSModule_h
 #define jit_AsmJSModule_h
 #ifdef JS_ION
 #include "mozilla/Move.h"
 #include "mozilla/PodOperations.h"
 #include "jsscript.h"
 #include "gc/Marking.h"
 #include "jit/AsmJS.h"
 #include "jit/IonMacroAssembler.h"
 #ifdef JS_ION_PERF
 # include "jit/PerfSpewer.h"
 #endif
 #include "jit/RegisterSets.h"
 #include "vm/TypedArrayObject.h"
 namespace js {
 // These EcmaScript-defined coercions form the basis of the asm.js type system.
 enum AsmJSCoercion
 {
     AsmJS_ToInt32,
     AsmJS_ToNumber,
     AsmJS_FRound
 };
 // The asm.js spec recognizes this set of builtin Math functions.
 enum AsmJSMathBuiltinFunction
 {
     AsmJSMathBuiltin_sin, AsmJSMathBuiltin_cos, AsmJSMathBuiltin_tan,
     AsmJSMathBuiltin_asin, AsmJSMathBuiltin_acos, AsmJSMathBuiltin_atan,
     AsmJSMathBuiltin_ceil, AsmJSMathBuiltin_floor, AsmJSMathBuiltin_exp,
     AsmJSMathBuiltin_log, AsmJSMathBuiltin_pow, AsmJSMathBuiltin_sqrt,
     AsmJSMathBuiltin_abs, AsmJSMathBuiltin_atan2, AsmJSMathBuiltin_imul,
     AsmJSMathBuiltin_fround, AsmJSMathBuiltin_min, AsmJSMathBuiltin_max
 };
 // An asm.js module represents the collection of functions nested inside a
 // single outer "use asm" function. For example, this asm.js module:
 //   function() { "use asm"; function f() {} function g() {} return f }
 // contains the functions 'f' and 'g'.
 //
 // An asm.js module contains both the jit-code produced by compiling all the
 // functions in the module as well all the data required to perform the
 // link-time validation step in the asm.js spec.
 //
 // NB: this means that AsmJSModule must be GC-safe.
 class AsmJSModule
 {
   public:
     class Global
     {
       public:
         enum Which { Variable, FFI, ArrayView, MathBuiltinFunction, Constant };
         enum VarInitKind { InitConstant, InitImport };
         enum ConstantKind { GlobalConstant, MathConstant };
       private:
         struct Pod {
             Which which_;
             union {
                 struct {
                     uint32_t index_;
                     VarInitKind initKind_;
                     AsmJSCoercion coercion_;
                     union {
                         Value constant_; // will only contain int32/double
                     } init;
                 } var;
                 uint32_t ffiIndex_;
                 ArrayBufferView::ViewType viewType_;
                 AsmJSMathBuiltinFunction mathBuiltinFunc_;
                 struct {
                     ConstantKind kind_;
                     double value_;
                 } constant;
             } u;
         } pod;
         PropertyName *name_;
         friend class AsmJSModule;
         Global(Which which, PropertyName *name) {
             pod.which_ = which;
             name_ = name;
             JS_ASSERT_IF(name_, name_->isTenured());
         }
         void trace(JSTracer *trc) {
             if (name_)
                 MarkStringUnbarriered(trc, &name_, "asm.js global name");
             JS_ASSERT_IF(pod.which_ == Variable && pod.u.var.initKind_ == InitConstant,
                          !pod.u.var.init.constant_.isMarkable());
         }
       public:
         Global() {}
         Which which() const {
             return pod.which_;
         }
         uint32_t varIndex() const {
             JS_ASSERT(pod.which_ == Variable);
             return pod.u.var.index_;
         }
         VarInitKind varInitKind() const {
             JS_ASSERT(pod.which_ == Variable);
             return pod.u.var.initKind_;
         }
         const Value &varInitConstant() const {
             JS_ASSERT(pod.which_ == Variable);
             JS_ASSERT(pod.u.var.initKind_ == InitConstant);
             return pod.u.var.init.constant_;
         }
         AsmJSCoercion varInitCoercion() const {
             JS_ASSERT(pod.which_ == Variable);
             return pod.u.var.coercion_;
         }
         PropertyName *varImportField() const {
             JS_ASSERT(pod.which_ == Variable);
             JS_ASSERT(pod.u.var.initKind_ == InitImport);
             return name_;
         }
         PropertyName *ffiField() const {
             JS_ASSERT(pod.which_ == FFI);
             return name_;
         }
         uint32_t ffiIndex() const {
             JS_ASSERT(pod.which_ == FFI);
             return pod.u.ffiIndex_;
         }
         PropertyName *viewName() const {
             JS_ASSERT(pod.which_ == ArrayView);
             return name_;
         }
         ArrayBufferView::ViewType viewType() const {
             JS_ASSERT(pod.which_ == ArrayView);
             return pod.u.viewType_;
         }
         PropertyName *mathName() const {
             JS_ASSERT(pod.which_ == MathBuiltinFunction);
             return name_;
         }
         AsmJSMathBuiltinFunction mathBuiltinFunction() const {
             JS_ASSERT(pod.which_ == MathBuiltinFunction);
             return pod.u.mathBuiltinFunc_;
         }
         PropertyName *constantName() const {
             JS_ASSERT(pod.which_ == Constant);
             return name_;
         }
         ConstantKind constantKind() const {
             JS_ASSERT(pod.which_ == Constant);
             return pod.u.constant.kind_;
         }
         double constantValue() const {
             JS_ASSERT(pod.which_ == Constant);
             return pod.u.constant.value_;
         }
         size_t serializedSize() const;
         uint8_t *serialize(uint8_t *cursor) const;
         const uint8_t *deserialize(ExclusiveContext *cx, const uint8_t *cursor);
         bool clone(ExclusiveContext *cx, Global *out) const;
     };
     class Exit
     {
         unsigned ffiIndex_;
         unsigned globalDataOffset_;
         unsigned interpCodeOffset_;
         unsigned ionCodeOffset_;
         friend class AsmJSModule;
       public:
         Exit() {}
         Exit(unsigned ffiIndex, unsigned globalDataOffset)
           : ffiIndex_(ffiIndex), globalDataOffset_(globalDataOffset),
             interpCodeOffset_(0), ionCodeOffset_(0)
         {}
         unsigned ffiIndex() const {
             return ffiIndex_;
         }
         unsigned globalDataOffset() const {
             return globalDataOffset_;
         }
         void initInterpOffset(unsigned off) {
             JS_ASSERT(!interpCodeOffset_);
             interpCodeOffset_ = off;
         }
         void initIonOffset(unsigned off) {
             JS_ASSERT(!ionCodeOffset_);
             ionCodeOffset_ = off;
         }
         void updateOffsets(jit::MacroAssembler &masm) {
             interpCodeOffset_ = masm.actualOffset(interpCodeOffset_);
             ionCodeOffset_ = masm.actualOffset(ionCodeOffset_);
         }
         size_t serializedSize() const;
         uint8_t *serialize(uint8_t *cursor) const;
         const uint8_t *deserialize(ExclusiveContext *cx, const uint8_t *cursor);
         bool clone(ExclusiveContext *cx, Exit *out) const;
     };
     typedef int32_t (*CodePtr)(uint64_t *args, uint8_t *global);
     typedef Vector<AsmJSCoercion, 0, SystemAllocPolicy> ArgCoercionVector;
     enum ReturnType { Return_Int32, Return_Double, Return_Void };
     class ExportedFunction
     {
         PropertyName *name_;
         PropertyName *maybeFieldName_;
         ArgCoercionVector argCoercions_;
         struct Pod {
             ReturnType returnType_;
             uint32_t codeOffset_;
             // These two fields are offsets to the beginning of the ScriptSource
             // of the module, and thus invariant under serialization (unlike
             // absolute offsets into ScriptSource).
             uint32_t startOffsetInModule_;
             uint32_t endOffsetInModule_;
         } pod;
         friend class AsmJSModule;
         ExportedFunction(PropertyName *name,
                          uint32_t startOffsetInModule, uint32_t endOffsetInModule,
                          PropertyName *maybeFieldName,
                          ArgCoercionVector &&argCoercions,
                          ReturnType returnType)
         {
             name_ = name;
             maybeFieldName_ = maybeFieldName;
             argCoercions_ = mozilla::Move(argCoercions);
             pod.returnType_ = returnType;
             pod.codeOffset_ = UINT32_MAX;
             pod.startOffsetInModule_ = startOffsetInModule;
             pod.endOffsetInModule_ = endOffsetInModule;
             JS_ASSERT_IF(maybeFieldName_, name_->isTenured());
         }
         void trace(JSTracer *trc) {
             MarkStringUnbarriered(trc, &name_, "asm.js export name");
             if (maybeFieldName_)
                 MarkStringUnbarriered(trc, &maybeFieldName_, "asm.js export field");
         }
       public:
         ExportedFunction() {}
         ExportedFunction(ExportedFunction &&rhs) {
             name_ = rhs.name_;
             maybeFieldName_ = rhs.maybeFieldName_;
             argCoercions_ = mozilla::Move(rhs.argCoercions_);
             pod = rhs.pod;
         }
         void updateCodeOffset(jit::MacroAssembler &masm) {
             pod.codeOffset_ = masm.actualOffset(pod.codeOffset_);
         }
         void initCodeOffset(unsigned off) {
             JS_ASSERT(pod.codeOffset_ == UINT32_MAX);
             pod.codeOffset_ = off;
         }
         PropertyName *name() const {
             return name_;
         }
         uint32_t startOffsetInModule() const {
             return pod.startOffsetInModule_;
         }
         uint32_t endOffsetInModule() const {
             return pod.endOffsetInModule_;
         }
         PropertyName *maybeFieldName() const {
             return maybeFieldName_;
         }
         unsigned numArgs() const {
             return argCoercions_.length();
         }
         AsmJSCoercion argCoercion(unsigned i) const {
             return argCoercions_[i];
         }
         ReturnType returnType() const {
             return pod.returnType_;
         }
         size_t serializedSize() const;
         uint8_t *serialize(uint8_t *cursor) const;
         const uint8_t *deserialize(ExclusiveContext *cx, const uint8_t *cursor);
         bool clone(ExclusiveContext *cx, ExportedFunction *out) const;
     };
     class Name
     {
         PropertyName *name_;
       public:
         Name() : name_(nullptr) {}
         Name(PropertyName *name) : name_(name) {}
         PropertyName *name() const { return name_; }
         PropertyName *&name() { return name_; }
         size_t serializedSize() const;
         uint8_t *serialize(uint8_t *cursor) const;
         const uint8_t *deserialize(ExclusiveContext *cx, const uint8_t *cursor);
         bool clone(ExclusiveContext *cx, Name *out) const;
     };
 #if defined(MOZ_VTUNE) || defined(JS_ION_PERF)
     // Function information to add to the VTune JIT profiler following linking.
     struct ProfiledFunction
     {
         PropertyName *name;
         struct Pod {
             unsigned startCodeOffset;
             unsigned endCodeOffset;
             unsigned lineno;
             unsigned columnIndex;
         } pod;
         explicit ProfiledFunction()
           : name(nullptr)
         { }
         ProfiledFunction(PropertyName *name, unsigned start, unsigned end,
                          unsigned line = 0, unsigned column = 0)
           : name(name)
         {
             JS_ASSERT(name->isTenured());
             pod.startCodeOffset = start;
             pod.endCodeOffset = end;
             pod.lineno = line;
             pod.columnIndex = column;
         }
         void trace(JSTracer *trc) {
             if (name)
                 MarkStringUnbarriered(trc, &name, "asm.js profiled function name");
         }
         size_t serializedSize() const;
         uint8_t *serialize(uint8_t *cursor) const;
         const uint8_t *deserialize(ExclusiveContext *cx, const uint8_t *cursor);
     };
 #endif
 #if defined(JS_ION_PERF)
     struct ProfiledBlocksFunction : public ProfiledFunction
     {
         unsigned endInlineCodeOffset;
         jit::BasicBlocksVector blocks;
         ProfiledBlocksFunction(PropertyName *name, unsigned start, unsigned endInline, unsigned end,
                                jit::BasicBlocksVector &blocksVector)
           : ProfiledFunction(name, start, end), endInlineCodeOffset(endInline),
             blocks(mozilla::Move(blocksVector))
         {
             JS_ASSERT(name->isTenured());
         }
         ProfiledBlocksFunction(ProfiledBlocksFunction &&copy)
           : ProfiledFunction(copy.name, copy.pod.startCodeOffset, copy.pod.endCodeOffset),
             endInlineCodeOffset(copy.endInlineCodeOffset), blocks(mozilla::Move(copy.blocks))
         { }
     };
 #endif
     struct RelativeLink
     {
         uint32_t patchAtOffset;
         uint32_t targetOffset;
     };
     typedef Vector<RelativeLink, 0, SystemAllocPolicy> RelativeLinkVector;
     struct AbsoluteLink
     {
         jit::CodeOffsetLabel patchAt;
         jit::AsmJSImmKind target;
     };
     typedef Vector<AbsoluteLink, 0, SystemAllocPolicy> AbsoluteLinkVector;
     // Static-link data is used to patch a module either after it has been
     // compiled or deserialized with various absolute addresses (of code or
     // data in the process) or relative addresses (of code or data in the same
     // AsmJSModule).
     struct StaticLinkData
     {
         uint32_t interruptExitOffset;
         RelativeLinkVector relativeLinks;
         AbsoluteLinkVector absoluteLinks;
         size_t serializedSize() const;
         uint8_t *serialize(uint8_t *cursor) const;
         const uint8_t *deserialize(ExclusiveContext *cx, const uint8_t *cursor);
         bool clone(ExclusiveContext *cx, StaticLinkData *out) const;
         size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
     };
   private:
     typedef Vector<Global, 0, SystemAllocPolicy> GlobalVector;
     typedef Vector<Exit, 0, SystemAllocPolicy> ExitVector;
     typedef Vector<ExportedFunction, 0, SystemAllocPolicy> ExportedFunctionVector;
     typedef Vector<jit::CallSite, 0, SystemAllocPolicy> CallSiteVector;
     typedef Vector<Name, 0, SystemAllocPolicy> FunctionNameVector;
     typedef Vector<jit::AsmJSHeapAccess, 0, SystemAllocPolicy> HeapAccessVector;
     typedef Vector<jit::IonScriptCounts *, 0, SystemAllocPolicy> FunctionCountsVector;
 #if defined(MOZ_VTUNE) || defined(JS_ION_PERF)
     typedef Vector<ProfiledFunction, 0, SystemAllocPolicy> ProfiledFunctionVector;
 #endif
 #if defined(JS_ION_PERF)
     typedef Vector<ProfiledBlocksFunction, 0, SystemAllocPolicy> ProfiledBlocksFunctionVector;
 #endif
   private:
     PropertyName *                        globalArgumentName_;
     PropertyName *                        importArgumentName_;
     PropertyName *                        bufferArgumentName_;
     GlobalVector                          globals_;
     ExitVector                            exits_;
     ExportedFunctionVector                exports_;
     CallSiteVector                        callSites_;
     FunctionNameVector                    functionNames_;
     HeapAccessVector                      heapAccesses_;
 #if defined(MOZ_VTUNE) || defined(JS_ION_PERF)
     ProfiledFunctionVector                profiledFunctions_;
 #endif
 #if defined(JS_ION_PERF)
     ProfiledBlocksFunctionVector          perfProfiledBlocksFunctions_;
 #endif
     struct Pod {
         uint32_t                          funcLength_;
         uint32_t                          funcLengthWithRightBrace_;
         bool                              strict_;
         uint32_t                          numGlobalVars_;
         uint32_t                          numFFIs_;
         size_t                            funcPtrTableAndExitBytes_;
         bool                              hasArrayView_;
         size_t                            functionBytes_; // just the function bodies, no stubs
         size_t                            codeBytes_;     // function bodies and stubs
         size_t                            totalBytes_;    // function bodies, stubs, and global data
         uint32_t                          minHeapLength_;
     } pod;
     uint8_t *                             code_;
     uint8_t *                             interruptExit_;
     StaticLinkData                        staticLinkData_;
     bool                                  dynamicallyLinked_;
     bool                                  loadedFromCache_;
     HeapPtr<ArrayBufferObject>            maybeHeap_;
     // The next two fields need to be kept out of the Pod as they depend on the
     // position of the module within the ScriptSource and thus aren't invariant
     // with caching.
     uint32_t                              funcStart_;
     uint32_t                              offsetToEndOfUseAsm_;
     ScriptSource *                        scriptSource_;
     // This field is accessed concurrently when requesting an interrupt.
     // Access must be synchronized via the runtime's interrupt lock.
     mutable bool                          codeIsProtected_;
   public:
     explicit AsmJSModule(ScriptSource *scriptSource, uint32_t functStart,
                          uint32_t offsetToEndOfUseAsm, bool strict);
     ~AsmJSModule();
     void trace(JSTracer *trc) {
         for (unsigned i = 0; i < globals_.length(); i++)
             globals_[i].trace(trc);
         for (unsigned i = 0; i < exports_.length(); i++)
             exports_[i].trace(trc);
         for (unsigned i = 0; i < exits_.length(); i++) {
             if (exitIndexToGlobalDatum(i).fun)
                 MarkObject(trc, &exitIndexToGlobalDatum(i).fun, "asm.js imported function");
         }
         for (unsigned i = 0; i < functionNames_.length(); i++)
             MarkStringUnbarriered(trc, &functionNames_[i].name(), "asm.js module function name");
 #if defined(MOZ_VTUNE) || defined(JS_ION_PERF)
         for (unsigned i = 0; i < profiledFunctions_.length(); i++)
             profiledFunctions_[i].trace(trc);
 #endif
 #if defined(JS_ION_PERF)
         for (unsigned i = 0; i < perfProfiledBlocksFunctions_.length(); i++)
             perfProfiledBlocksFunctions_[i].trace(trc);
 #endif
         if (maybeHeap_)
             gc::MarkObject(trc, &maybeHeap_, "asm.js heap");
         if (globalArgumentName_)
             MarkStringUnbarriered(trc, &globalArgumentName_, "asm.js global argument name");
         if (importArgumentName_)
             MarkStringUnbarriered(trc, &importArgumentName_, "asm.js import argument name");
         if (bufferArgumentName_)
             MarkStringUnbarriered(trc, &bufferArgumentName_, "asm.js buffer argument name");
     }
     ScriptSource *scriptSource() const {
         JS_ASSERT(scriptSource_ != nullptr);
         return scriptSource_;
     }
     /*
      * funcStart() refers to the offset in the ScriptSource to the beginning
      * of the function. If the function has been created with the Function
      * constructor, this will be the first character in the function source.
      * Otherwise, it will be the opening parenthesis of the arguments list.
      */
     uint32_t funcStart() const {
         return funcStart_;
     }
     uint32_t offsetToEndOfUseAsm() const {
         return offsetToEndOfUseAsm_;
     }
     void initFuncEnd(uint32_t endBeforeCurly, uint32_t endAfterCurly) {
         JS_ASSERT(endBeforeCurly >= offsetToEndOfUseAsm_);
         JS_ASSERT(endAfterCurly >= offsetToEndOfUseAsm_);
         pod.funcLength_ = endBeforeCurly - funcStart_;
         pod.funcLengthWithRightBrace_ = endAfterCurly - funcStart_;
     }
     uint32_t funcEndBeforeCurly() const {
         return funcStart_ + pod.funcLength_;
     }
     uint32_t funcEndAfterCurly() const {
         return funcStart_ + pod.funcLengthWithRightBrace_;
     }
     bool strict() const {
         return pod.strict_;
     }
     bool addGlobalVarInit(const Value &v, AsmJSCoercion coercion, uint32_t *globalIndex) {
         JS_ASSERT(pod.funcPtrTableAndExitBytes_ == 0);
         if (pod.numGlobalVars_ == UINT32_MAX)
             return false;
         Global g(Global::Variable, nullptr);
         g.pod.u.var.initKind_ = Global::InitConstant;
         g.pod.u.var.init.constant_ = v;
         g.pod.u.var.coercion_ = coercion;
         g.pod.u.var.index_ = *globalIndex = pod.numGlobalVars_++;
         return globals_.append(g);
     }
     bool addGlobalVarImport(PropertyName *name, AsmJSCoercion coercion, uint32_t *globalIndex) {
         JS_ASSERT(pod.funcPtrTableAndExitBytes_ == 0);
         Global g(Global::Variable, name);
         g.pod.u.var.initKind_ = Global::InitImport;
         g.pod.u.var.coercion_ = coercion;
         g.pod.u.var.index_ = *globalIndex = pod.numGlobalVars_++;
         return globals_.append(g);
     }
     bool addFFI(PropertyName *field, uint32_t *ffiIndex) {
         if (pod.numFFIs_ == UINT32_MAX)
             return false;
         Global g(Global::FFI, field);
         g.pod.u.ffiIndex_ = *ffiIndex = pod.numFFIs_++;
         return globals_.append(g);
     }
     bool addArrayView(ArrayBufferView::ViewType vt, PropertyName *field) {
         pod.hasArrayView_ = true;
         Global g(Global::ArrayView, field);
         g.pod.u.viewType_ = vt;
         return globals_.append(g);
     }
     bool addMathBuiltinFunction(AsmJSMathBuiltinFunction func, PropertyName *field) {
         Global g(Global::MathBuiltinFunction, field);
         g.pod.u.mathBuiltinFunc_ = func;
         return globals_.append(g);
     }
     bool addMathBuiltinConstant(double value, PropertyName *field) {
         Global g(Global::Constant, field);
         g.pod.u.constant.value_ = value;
         g.pod.u.constant.kind_ = Global::MathConstant;
         return globals_.append(g);
     }
     bool addGlobalConstant(double value, PropertyName *name) {
         Global g(Global::Constant, name);
         g.pod.u.constant.value_ = value;
         g.pod.u.constant.kind_ = Global::GlobalConstant;
         return globals_.append(g);
     }
     bool addFuncPtrTable(unsigned numElems, uint32_t *globalDataOffset) {
         JS_ASSERT(IsPowerOfTwo(numElems));
         if (SIZE_MAX - pod.funcPtrTableAndExitBytes_ < numElems * sizeof(void*))
             return false;
         *globalDataOffset = globalDataBytes();
         pod.funcPtrTableAndExitBytes_ += numElems * sizeof(void*);
         return true;
     }
     bool addExit(unsigned ffiIndex, unsigned *exitIndex) {
         if (SIZE_MAX - pod.funcPtrTableAndExitBytes_ < sizeof(ExitDatum))
             return false;
         uint32_t globalDataOffset = globalDataBytes();
         JS_STATIC_ASSERT(sizeof(ExitDatum) % sizeof(void*) == 0);
         pod.funcPtrTableAndExitBytes_ += sizeof(ExitDatum);
         *exitIndex = unsigned(exits_.length());
         return exits_.append(Exit(ffiIndex, globalDataOffset));
     }
     bool addExportedFunction(PropertyName *name, uint32_t srcStart, uint32_t srcEnd,
                              PropertyName *maybeFieldName,
                              ArgCoercionVector &&argCoercions,
                              ReturnType returnType)
     {
         ExportedFunction func(name, srcStart, srcEnd, maybeFieldName,
                               mozilla::Move(argCoercions), returnType);
         if (exports_.length() >= UINT32_MAX)
             return false;
         return exports_.append(mozilla::Move(func));
     }
     unsigned numExportedFunctions() const {
         return exports_.length();
     }
     const ExportedFunction &exportedFunction(unsigned i) const {
         return exports_[i];
     }
     ExportedFunction &exportedFunction(unsigned i) {
         return exports_[i];
     }
     CodePtr entryTrampoline(const ExportedFunction &func) const {
         JS_ASSERT(func.pod.codeOffset_ != UINT32_MAX);
         return JS_DATA_TO_FUNC_PTR(CodePtr, code_ + func.pod.codeOffset_);
     }
     bool addFunctionName(PropertyName *name, uint32_t *nameIndex) {
         JS_ASSERT(name->isTenured());
         if (functionNames_.length() > jit::CallSiteDesc::FUNCTION_NAME_INDEX_MAX)
             return false;
         *nameIndex = functionNames_.length();
         return functionNames_.append(name);
     }
     PropertyName *functionName(uint32_t i) const {
         return functionNames_[i].name();
     }
 #if defined(MOZ_VTUNE) || defined(JS_ION_PERF)
     bool trackProfiledFunction(PropertyName *name, unsigned startCodeOffset, unsigned endCodeOffset,
                                unsigned line, unsigned column)
     {
         ProfiledFunction func(name, startCodeOffset, endCodeOffset, line, column);
         return profiledFunctions_.append(func);
     }
     unsigned numProfiledFunctions() const {
         return profiledFunctions_.length();
     }
     ProfiledFunction &profiledFunction(unsigned i) {
         return profiledFunctions_[i];
     }
 #endif
 #ifdef JS_ION_PERF
     bool trackPerfProfiledBlocks(PropertyName *name, unsigned startCodeOffset, unsigned endInlineCodeOffset,
                                  unsigned endCodeOffset, jit::BasicBlocksVector &basicBlocks) {
         ProfiledBlocksFunction func(name, startCodeOffset, endInlineCodeOffset, endCodeOffset, basicBlocks);
         return perfProfiledBlocksFunctions_.append(mozilla::Move(func));
     }
     unsigned numPerfBlocksFunctions() const {
         return perfProfiledBlocksFunctions_.length();
     }
     ProfiledBlocksFunction &perfProfiledBlocksFunction(unsigned i) {
         return perfProfiledBlocksFunctions_[i];
     }
 #endif
     bool hasArrayView() const {
         return pod.hasArrayView_;
     }
     unsigned numFFIs() const {
         return pod.numFFIs_;
     }
     unsigned numGlobalVars() const {
         return pod.numGlobalVars_;
     }
     unsigned numGlobals() const {
         return globals_.length();
     }
     Global &global(unsigned i) {
         return globals_[i];
     }
     unsigned numExits() const {
         return exits_.length();
     }
     Exit &exit(unsigned i) {
         return exits_[i];
     }
     const Exit &exit(unsigned i) const {
         return exits_[i];
     }
     uint8_t *interpExitTrampoline(const Exit &exit) const {
         JS_ASSERT(exit.interpCodeOffset_);
         return code_ + exit.interpCodeOffset_;
     }
     uint8_t *ionExitTrampoline(const Exit &exit) const {
         JS_ASSERT(exit.ionCodeOffset_);
         return code_ + exit.ionCodeOffset_;
     }
     // An Exit holds bookkeeping information about an exit; the ExitDatum
     // struct overlays the actual runtime data stored in the global data
     // section.
     struct ExitDatum
     {
         uint8_t *exit;
         HeapPtrFunction fun;
     };
     // Global data section
     //
     // The global data section is placed after the executable code (i.e., at
     // offset codeBytes_) in the module's linear allocation. The global data
     // are laid out in this order:
     //   0. a pointer/descriptor for the heap that was linked to the module
     //   1. global variable state (elements are sizeof(uint64_t))
     //   2. interleaved function-pointer tables and exits. These are allocated
     //      while type checking function bodies (as exits and uses of
     //      function-pointer tables are encountered).
     size_t offsetOfGlobalData() const {
         JS_ASSERT(code_);
         return pod.codeBytes_;
     }
     uint8_t *globalData() const {
         return code_ + offsetOfGlobalData();
     }
     size_t globalDataBytes() const {
         return sizeof(void*) +
                pod.numGlobalVars_ * sizeof(uint64_t) +
                pod.funcPtrTableAndExitBytes_;
     }
     unsigned heapOffset() const {
         return 0;
     }
     uint8_t *&heapDatum() const {
         return *(uint8_t**)(globalData() + heapOffset());
     }
     unsigned globalVarIndexToGlobalDataOffset(unsigned i) const {
         JS_ASSERT(i < pod.numGlobalVars_);
         return sizeof(void*) +
                i * sizeof(uint64_t);
     }
     void *globalVarIndexToGlobalDatum(unsigned i) const {
         return (void *)(globalData() + globalVarIndexToGlobalDataOffset(i));
     }
     uint8_t **globalDataOffsetToFuncPtrTable(unsigned globalDataOffset) const {
         JS_ASSERT(globalDataOffset < globalDataBytes());
         return (uint8_t **)(globalData() + globalDataOffset);
     }
     unsigned exitIndexToGlobalDataOffset(unsigned exitIndex) const {
         return exits_[exitIndex].globalDataOffset();
     }
     ExitDatum &exitIndexToGlobalDatum(unsigned exitIndex) const {
         return *(ExitDatum *)(globalData() + exitIndexToGlobalDataOffset(exitIndex));
     }
     void initFunctionBytes(size_t functionBytes) {
         JS_ASSERT(pod.functionBytes_ == 0);
         pod.functionBytes_ = functionBytes;
     }
     void updateFunctionBytes(jit::MacroAssembler &masm) {
         pod.functionBytes_ = masm.actualOffset(pod.functionBytes_);
         JS_ASSERT(pod.functionBytes_ % AsmJSPageSize == 0);
     }
     size_t functionBytes() const {
         JS_ASSERT(pod.functionBytes_);
         JS_ASSERT(pod.functionBytes_ % AsmJSPageSize == 0);
         return pod.functionBytes_;
     }
     bool containsPC(void *pc) const {
         return pc >= code_ && pc < (code_ + functionBytes());
     }
     void assignHeapAccesses(jit::AsmJSHeapAccessVector &&accesses) {
         heapAccesses_ = Move(accesses);
     }
     unsigned numHeapAccesses() const {
         return heapAccesses_.length();
     }
     const jit::AsmJSHeapAccess &heapAccess(unsigned i) const {
         return heapAccesses_[i];
     }
     jit::AsmJSHeapAccess &heapAccess(unsigned i) {
         return heapAccesses_[i];
     }
     void assignCallSites(jit::CallSiteVector &&callsites) {
         callSites_ = Move(callsites);
     }
     unsigned numCallSites() const {
         return callSites_.length();
     }
     const jit::CallSite &callSite(unsigned i) const {
         return callSites_[i];
     }
     jit::CallSite &callSite(unsigned i) {
         return callSites_[i];
     }
     void initHeap(Handle<ArrayBufferObject*> heap, JSContext *cx);
     void requireHeapLengthToBeAtLeast(uint32_t len) {
         if (len > pod.minHeapLength_)
             pod.minHeapLength_ = len;
     }
     uint32_t minHeapLength() const {
         return pod.minHeapLength_;
     }
     bool allocateAndCopyCode(ExclusiveContext *cx, jit::MacroAssembler &masm);
     // StaticLinkData setters (called after finishing compilation, before
     // staticLink).
     bool addRelativeLink(RelativeLink link) {
         return staticLinkData_.relativeLinks.append(link);
     }
     bool addAbsoluteLink(AbsoluteLink link) {
         return staticLinkData_.absoluteLinks.append(link);
     }
     void setInterruptOffset(uint32_t offset) {
         staticLinkData_.interruptExitOffset = offset;
     }
     void restoreToInitialState(ArrayBufferObject *maybePrevBuffer, ExclusiveContext *cx);
     void setAutoFlushICacheRange();
     void staticallyLink(ExclusiveContext *cx);
     uint8_t *codeBase() const {
         JS_ASSERT(code_);
         JS_ASSERT(uintptr_t(code_) % AsmJSPageSize == 0);
         return code_;
     }
     uint8_t *interruptExit() const {
         return interruptExit_;
     }
     void setIsDynamicallyLinked() {
         JS_ASSERT(!dynamicallyLinked_);
         dynamicallyLinked_ = true;
     }
     bool isDynamicallyLinked() const {
         return dynamicallyLinked_;
     }
     uint8_t *maybeHeap() const {
         JS_ASSERT(dynamicallyLinked_);
         return heapDatum();
     }
     ArrayBufferObject *maybeHeapBufferObject() const {
         JS_ASSERT(dynamicallyLinked_);
         return maybeHeap_;
     }
     size_t heapLength() const {
         JS_ASSERT(dynamicallyLinked_);
         return maybeHeap_ ? maybeHeap_->byteLength() : 0;
     }
     void initGlobalArgumentName(PropertyName *n) {
         JS_ASSERT_IF(n, n->isTenured());
         globalArgumentName_ = n;
     }
     void initImportArgumentName(PropertyName *n) {
         JS_ASSERT_IF(n, n->isTenured());
         importArgumentName_ = n;
     }
     void initBufferArgumentName(PropertyName *n) {
         JS_ASSERT_IF(n, n->isTenured());
         bufferArgumentName_ = n;
     }
     PropertyName *globalArgumentName() const {
         return globalArgumentName_;
     }
     PropertyName *importArgumentName() const {
         return importArgumentName_;
     }
     PropertyName *bufferArgumentName() const {
         return bufferArgumentName_;
     }
     void detachIonCompilation(size_t exitIndex) const {
         exitIndexToGlobalDatum(exitIndex).exit = interpExitTrampoline(exit(exitIndex));
     }
     void addSizeOfMisc(mozilla::MallocSizeOf mallocSizeOf, size_t *asmJSModuleCode,
                        size_t *asmJSModuleData);
     size_t serializedSize() const;
     uint8_t *serialize(uint8_t *cursor) const;
     const uint8_t *deserialize(ExclusiveContext *cx, const uint8_t *cursor);
     bool loadedFromCache() const { return loadedFromCache_; }
     bool clone(JSContext *cx, ScopedJSDeletePtr<AsmJSModule> *moduleOut) const;
     // These methods may only be called while holding the Runtime's interrupt
     // lock.
     void protectCode(JSRuntime *rt) const;
     void unprotectCode(JSRuntime *rt) const;
     bool codeIsProtected(JSRuntime *rt) const;
 };
 // Store the just-parsed module in the cache using AsmJSCacheOps.
 extern bool
 StoreAsmJSModuleInCache(AsmJSParser &parser,
                         const AsmJSModule &module,
                         ExclusiveContext *cx);
 // Attempt to load the asm.js module that is about to be parsed from the cache
 // using AsmJSCacheOps. On cache hit, *module will be non-null. Note: the
 // return value indicates whether or not an error was encountered, not whether
 // there was a cache hit.
 extern bool
 LookupAsmJSModuleInCache(ExclusiveContext *cx,
                          AsmJSParser &parser,
                          ScopedJSDeletePtr<AsmJSModule> *module,
                          ScopedJSFreePtr<char> *compilationTimeReport);
 // An AsmJSModuleObject is an internal implementation object (i.e., not exposed
 // directly to user script) which manages the lifetime of an AsmJSModule. A
 // JSObject is necessary since we want LinkAsmJS/CallAsmJS JSFunctions to be
 // able to point to their module via their extended slots.
 class AsmJSModuleObject : public JSObject
 {
     static const unsigned MODULE_SLOT = 0;
   public:
     static const unsigned RESERVED_SLOTS = 1;
     // On success, return an AsmJSModuleClass JSObject that has taken ownership
     // (and release()ed) the given module.
     static AsmJSModuleObject *create(ExclusiveContext *cx, ScopedJSDeletePtr<AsmJSModule> *module);
     AsmJSModule &module() const;
     void addSizeOfMisc(mozilla::MallocSizeOf mallocSizeOf, size_t *asmJSModuleCode,
                        size_t *asmJSModuleData) {
         module().addSizeOfMisc(mallocSizeOf, asmJSModuleCode, asmJSModuleData);
     }
     static const Class class_;
 };
 }  // namespace js
 #endif  // JS_ION
 #endif /* jit_AsmJSModule_h */

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js/src/jit/AsmJSModule.h