C++ (Cpp) JitActivationIterator示例

示例#1

文件： Bailouts.cpp 项目： AtulKumar2/gecko-dev

void
BailoutFrameInfo::attachOnJitActivation(const JitActivationIterator& jitActivations)
{
    MOZ_ASSERT(jitActivations.jitTop() == FAKE_JIT_TOP_FOR_BAILOUT);
    activation_ = jitActivations->asJit();
    activation_->setBailoutData(this);
}

示例#2

文件： Bailouts-x86.cpp 项目： ConradIrwin/gecko-dev

IonBailoutIterator::IonBailoutIterator(const JitActivationIterator &activations,
                                       BailoutStack *bailout)
  : IonFrameIterator(activations),
    machine_(bailout->machine())
{
    uint8_t *sp = bailout->parentStackPointer();
    uint8_t *fp = sp + bailout->frameSize();

    current_ = fp;
    type_ = IonFrame_OptimizedJS;
    topFrameSize_ = current_ - sp;
    topIonScript_ = script()->ionScript();

    if (bailout->frameClass() == FrameSizeClass::None()) {
        snapshotOffset_ = bailout->snapshotOffset();
        return;
    }

    // Compute the snapshot offset from the bailout ID.
    JitActivation *activation = activations.activation()->asJit();
    JSRuntime *rt = activation->compartment()->runtimeFromMainThread();
    JitCode *code = rt->jitRuntime()->getBailoutTable(bailout->frameClass());
    uintptr_t tableOffset = bailout->tableOffset();
    uintptr_t tableStart = reinterpret_cast<uintptr_t>(code->raw());

    JS_ASSERT(tableOffset >= tableStart &&
              tableOffset < tableStart + code->instructionsSize());
    JS_ASSERT((tableOffset - tableStart) % BAILOUT_TABLE_ENTRY_SIZE == 0);

    uint32_t bailoutId = ((tableOffset - tableStart) / BAILOUT_TABLE_ENTRY_SIZE) - 1;
    JS_ASSERT(bailoutId < BAILOUT_TABLE_SIZE);

    snapshotOffset_ = topIonScript_->bailoutToSnapshot(bailoutId);
}

示例#3

文件： Bailouts-arm.cpp 项目： edunham/mozjs

BailoutFrameInfo::BailoutFrameInfo(const JitActivationIterator &activations,
                                   BailoutStack *bailout)
  : machine_(bailout->machine())
{
    uint8_t *sp = bailout->parentStackPointer();
    framePointer_ = sp + bailout->frameSize();
    topFrameSize_ = framePointer_ - sp;

    JSScript *script = ScriptFromCalleeToken(((JitFrameLayout *) framePointer_)->calleeToken());
    JitActivation *activation = activations.activation()->asJit();
    topIonScript_ = script->ionScript();

    attachOnJitActivation(activations);

    if (bailout->frameClass() == FrameSizeClass::None()) {
        snapshotOffset_ = bailout->snapshotOffset();
        return;
    }

    // Compute the snapshot offset from the bailout ID.
    JSRuntime *rt = activation->compartment()->runtimeFromMainThread();
    JitCode *code = rt->jitRuntime()->getBailoutTable(bailout->frameClass());
    uintptr_t tableOffset = bailout->tableOffset();
    uintptr_t tableStart = reinterpret_cast<uintptr_t>(Assembler::BailoutTableStart(code->raw()));

    MOZ_ASSERT(tableOffset >= tableStart &&
               tableOffset < tableStart + code->instructionsSize());
    MOZ_ASSERT((tableOffset - tableStart) % BAILOUT_TABLE_ENTRY_SIZE == 0);

    uint32_t bailoutId = ((tableOffset - tableStart) / BAILOUT_TABLE_ENTRY_SIZE) - 1;
    MOZ_ASSERT(bailoutId < BAILOUT_TABLE_SIZE);

    snapshotOffset_ = topIonScript_->bailoutToSnapshot(bailoutId);
}

示例#4

文件： Bailouts-arm.cpp 项目： caiolima/spidermonkey

IonBailoutIterator::IonBailoutIterator(const JitActivationIterator &activations,
                                       BailoutStack *bailout)
  : JitFrameIterator(activations),
    machine_(bailout->machine())
{
    uint8_t *sp = bailout->parentStackPointer();
    uint8_t *fp = sp + bailout->frameSize();

    kind_ = Kind_BailoutIterator;
    current_ = fp;
    type_ = JitFrame_IonJS;
    topFrameSize_ = current_ - sp;
    switch (mode_) {
      case SequentialExecution: topIonScript_ = script()->ionScript(); break;
      case ParallelExecution: topIonScript_ = script()->parallelIonScript(); break;
      default: MOZ_ASSUME_UNREACHABLE("No such execution mode");
    }

    if (bailout->frameClass() == FrameSizeClass::None()) {
        snapshotOffset_ = bailout->snapshotOffset();
        return;
    }

    // Compute the snapshot offset from the bailout ID.
    JitActivation *activation = activations.activation()->asJit();
    JSRuntime *rt = activation->compartment()->runtimeFromMainThread();
    JitCode *code = rt->jitRuntime()->getBailoutTable(bailout->frameClass());
    uintptr_t tableOffset = bailout->tableOffset();
    uintptr_t tableStart = reinterpret_cast<uintptr_t>(Assembler::BailoutTableStart(code->raw()));

    JS_ASSERT(tableOffset >= tableStart &&
              tableOffset < tableStart + code->instructionsSize());
    JS_ASSERT((tableOffset - tableStart) % BAILOUT_TABLE_ENTRY_SIZE == 0);

    uint32_t bailoutId = ((tableOffset - tableStart) / BAILOUT_TABLE_ENTRY_SIZE) - 1;
    JS_ASSERT(bailoutId < BAILOUT_TABLE_SIZE);

    snapshotOffset_ = topIonScript_->bailoutToSnapshot(bailoutId);
}