blob: 18219fc00144942d8263886d74899c08ec6adc8a [file] [log] [blame]
/* -*- 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 "jscntxt.h"
#include "jscompartment.h"
#include "jit/Bailouts.h"
#include "jit/IonCompartment.h"
#include "jit/IonFrames-inl.h"
using namespace js;
using namespace js::jit;
#if 0
// no clue what these asserts should be.
JS_STATIC_ASSERT(sizeof(BailoutStack) ==
sizeof(uintptr_t) +
sizeof(double) * 8 +
sizeof(uintptr_t) * 8 +
sizeof(uintptr_t));
JS_STATIC_ASSERT(sizeof(ExtendedBailoutStack) ==
sizeof(BailoutStack) +
sizeof(uintptr_t));
#endif
#if 0
BailoutEnvironment::BailoutEnvironment(IonCompartment *ion, void **sp)
: sp_(sp)
{
bailout_ = reinterpret_cast<ExtendedBailoutStack *>(sp);
if (bailout_->frameClass() != FrameSizeClass::None()) {
frameSize_ = bailout_->frameSize();
frame_ = &sp_[sizeof(BailoutStack) / STACK_SLOT_SIZE];
// Compute the bailout ID.
IonCode *code = ion->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);
bailoutId_ = ((tableOffset - tableStart) / BAILOUT_TABLE_ENTRY_SIZE) - 1;
JS_ASSERT(bailoutId_ < BAILOUT_TABLE_SIZE);
} else {
frameSize_ = bailout_->frameSize();
frame_ = &sp_[sizeof(ExtendedBailoutStack) / STACK_SLOT_SIZE];
}
}
IonFramePrefix *
BailoutEnvironment::top() const
{
return (IonFramePrefix *)&frame_[frameSize_ / STACK_SLOT_SIZE];
}
#endif
namespace js {
namespace jit {
class BailoutStack
{
uintptr_t frameClassId_;
// This is pushed in the bailout handler. Both entry points into the handler
// inserts their own value int lr, which is then placed onto the stack along
// with frameClassId_ above. This should be migrated to ip.
public:
union {
uintptr_t frameSize_;
uintptr_t tableOffset_;
};
private:
double fpregs_[FloatRegisters::Total];
uintptr_t regs_[Registers::Total];
uintptr_t snapshotOffset_;
public:
FrameSizeClass frameClass() const {
return FrameSizeClass::FromClass(frameClassId_);
}
uintptr_t tableOffset() const {
JS_ASSERT(frameClass() != FrameSizeClass::None());
return tableOffset_;
}
uint32_t frameSize() const {
if (frameClass() == FrameSizeClass::None())
return frameSize_;
return frameClass().frameSize();
}
MachineState machine() {
return MachineState::FromBailout(regs_, fpregs_);
}
SnapshotOffset snapshotOffset() const {
JS_ASSERT(frameClass() == FrameSizeClass::None());
return snapshotOffset_;
}
uint8_t *parentStackPointer() const {
if (frameClass() == FrameSizeClass::None())
return (uint8_t *)this + sizeof(BailoutStack);
return (uint8_t *)this + offsetof(BailoutStack, snapshotOffset_);
}
};
} // namespace jit
} // namespace js
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();
JSCompartment *jsCompartment = activation->compartment();
IonCompartment *ionCompartment = jsCompartment->ionCompartment();
IonCode *code = ionCompartment->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);
}
IonBailoutIterator::IonBailoutIterator(const JitActivationIterator &activations,
InvalidationBailoutStack *bailout)
: IonFrameIterator(activations),
machine_(bailout->machine())
{
returnAddressToFp_ = bailout->osiPointReturnAddress();
topIonScript_ = bailout->ionScript();
const OsiIndex *osiIndex = topIonScript_->getOsiIndex(returnAddressToFp_);
current_ = (uint8_t*) bailout->fp();
type_ = IonFrame_OptimizedJS;
topFrameSize_ = current_ - bailout->sp();
snapshotOffset_ = osiIndex->snapshotOffset();
}