src/third_party/mozjs-45/js/src/jit/x64/Bailouts-x64.cpp

/* -*- 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/. */

#include "jit/Bailouts.h"

using namespace js;
using namespace js::jit;

#if defined(_WIN32)
# pragma pack(push, 1)
#endif

namespace js {
namespace jit {

class BailoutStack
{
    RegisterDump::FPUArray fpregs_;
    RegisterDump::GPRArray regs_;
    uintptr_t frameSize_;
    uintptr_t snapshotOffset_;

  public:
    MachineState machineState() {
        return MachineState::FromBailout(regs_, fpregs_);
    }
    uint32_t snapshotOffset() const {
        return snapshotOffset_;
    }
    uint32_t frameSize() const {
        return frameSize_;
    }
    uint8_t* parentStackPointer() {
        return (uint8_t*)this + sizeof(BailoutStack);
    }
};

} // namespace jit
} // namespace js

#if defined(_WIN32)
# pragma pack(pop)
#endif

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

    JSScript* script = ScriptFromCalleeToken(((JitFrameLayout*) framePointer_)->calleeToken());
    topIonScript_ = script->ionScript();

    attachOnJitActivation(activations);
    snapshotOffset_ = bailout->snapshotOffset();
}

BailoutFrameInfo::BailoutFrameInfo(const JitActivationIterator& activations,
                                   InvalidationBailoutStack* bailout)
  : machine_(bailout->machine())
{
    framePointer_ = (uint8_t*) bailout->fp();
    topFrameSize_ = framePointer_ - bailout->sp();
    topIonScript_ = bailout->ionScript();
    attachOnJitActivation(activations);

    uint8_t* returnAddressToFp_ = bailout->osiPointReturnAddress();
    const OsiIndex* osiIndex = topIonScript_->getOsiIndex(returnAddressToFp_);
    snapshotOffset_ = osiIndex->snapshotOffset();
}