michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "jscntxt.h"
michael@0: #include "jscompartment.h"
michael@0: 
michael@0: #include "jit/Bailouts.h"
michael@0: #include "jit/JitCompartment.h"
michael@0: 
michael@0: using namespace js;
michael@0: using namespace js::jit;
michael@0: 
michael@0: #if defined(_WIN32)
michael@0: # pragma pack(push, 1)
michael@0: #endif
michael@0: 
michael@0: namespace js {
michael@0: namespace jit {
michael@0: 
michael@0: class BailoutStack
michael@0: {
michael@0:     uintptr_t frameClassId_;
michael@0:     mozilla::Array<double, FloatRegisters::Total> fpregs_;
michael@0:     mozilla::Array<uintptr_t, Registers::Total> regs_;
michael@0:     union {
michael@0:         uintptr_t frameSize_;
michael@0:         uintptr_t tableOffset_;
michael@0:     };
michael@0:     uintptr_t snapshotOffset_;
michael@0: 
michael@0:   public:
michael@0:     FrameSizeClass frameClass() const {
michael@0:         return FrameSizeClass::FromClass(frameClassId_);
michael@0:     }
michael@0:     uintptr_t tableOffset() const {
michael@0:         JS_ASSERT(frameClass() != FrameSizeClass::None());
michael@0:         return tableOffset_;
michael@0:     }
michael@0:     uint32_t frameSize() const {
michael@0:         if (frameClass() == FrameSizeClass::None())
michael@0:             return frameSize_;
michael@0:         return frameClass().frameSize();
michael@0:     }
michael@0:     MachineState machine() {
michael@0:         return MachineState::FromBailout(regs_, fpregs_);
michael@0:     }
michael@0:     SnapshotOffset snapshotOffset() const {
michael@0:         JS_ASSERT(frameClass() == FrameSizeClass::None());
michael@0:         return snapshotOffset_;
michael@0:     }
michael@0:     uint8_t *parentStackPointer() const {
michael@0:         if (frameClass() == FrameSizeClass::None())
michael@0:             return (uint8_t *)this + sizeof(BailoutStack);
michael@0:         return (uint8_t *)this + offsetof(BailoutStack, snapshotOffset_);
michael@0:     }
michael@0: };
michael@0: 
michael@0: } // namespace jit
michael@0: } // namespace js
michael@0: 
michael@0: #if defined(_WIN32)
michael@0: # pragma pack(pop)
michael@0: #endif
michael@0: 
michael@0: IonBailoutIterator::IonBailoutIterator(const JitActivationIterator &activations,
michael@0:                                        BailoutStack *bailout)
michael@0:   : JitFrameIterator(activations),
michael@0:     machine_(bailout->machine())
michael@0: {
michael@0:     uint8_t *sp = bailout->parentStackPointer();
michael@0:     uint8_t *fp = sp + bailout->frameSize();
michael@0: 
michael@0:     current_ = fp;
michael@0:     type_ = JitFrame_IonJS;
michael@0:     topFrameSize_ = current_ - sp;
michael@0:     topIonScript_ = script()->ionScript();
michael@0: 
michael@0:     if (bailout->frameClass() == FrameSizeClass::None()) {
michael@0:         snapshotOffset_ = bailout->snapshotOffset();
michael@0:         return;
michael@0:     }
michael@0: 
michael@0:     // Compute the snapshot offset from the bailout ID.
michael@0:     JitActivation *activation = activations.activation()->asJit();
michael@0:     JSRuntime *rt = activation->compartment()->runtimeFromMainThread();
michael@0:     JitCode *code = rt->jitRuntime()->getBailoutTable(bailout->frameClass());
michael@0:     uintptr_t tableOffset = bailout->tableOffset();
michael@0:     uintptr_t tableStart = reinterpret_cast<uintptr_t>(code->raw());
michael@0: 
michael@0:     JS_ASSERT(tableOffset >= tableStart &&
michael@0:               tableOffset < tableStart + code->instructionsSize());
michael@0:     JS_ASSERT((tableOffset - tableStart) % BAILOUT_TABLE_ENTRY_SIZE == 0);
michael@0: 
michael@0:     uint32_t bailoutId = ((tableOffset - tableStart) / BAILOUT_TABLE_ENTRY_SIZE) - 1;
michael@0:     JS_ASSERT(bailoutId < BAILOUT_TABLE_SIZE);
michael@0: 
michael@0:     snapshotOffset_ = topIonScript_->bailoutToSnapshot(bailoutId);
michael@0: }
michael@0: 
michael@0: IonBailoutIterator::IonBailoutIterator(const JitActivationIterator &activations,
michael@0:                                        InvalidationBailoutStack *bailout)
michael@0:   : JitFrameIterator(activations),
michael@0:     machine_(bailout->machine())
michael@0: {
michael@0:     returnAddressToFp_ = bailout->osiPointReturnAddress();
michael@0:     topIonScript_ = bailout->ionScript();
michael@0:     const OsiIndex *osiIndex = topIonScript_->getOsiIndex(returnAddressToFp_);
michael@0: 
michael@0:     current_ = (uint8_t*) bailout->fp();
michael@0:     type_ = JitFrame_IonJS;
michael@0:     topFrameSize_ = current_ - bailout->sp();
michael@0:     snapshotOffset_ = osiIndex->snapshotOffset();
michael@0: }