js/src/jit/x86/Bailouts-x86.cpp@6474c204b198 (annotated)
js/src/jit/x86/Bailouts-x86.cpp
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| michael@0 | 2 | * vim: set ts=8 sts=4 et sw=4 tw=99: |
| michael@0 | 3 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #include "jscntxt.h" |
| michael@0 | 8 | #include "jscompartment.h" |
| michael@0 | 9 | |
| michael@0 | 10 | #include "jit/Bailouts.h" |
| michael@0 | 11 | #include "jit/JitCompartment.h" |
| michael@0 | 12 | |
| michael@0 | 13 | using namespace js; |
| michael@0 | 14 | using namespace js::jit; |
| michael@0 | 15 | |
| michael@0 | 16 | #if defined(_WIN32) |
| michael@0 | 17 | # pragma pack(push, 1) |
| michael@0 | 18 | #endif |
| michael@0 | 19 | |
| michael@0 | 20 | namespace js { |
| michael@0 | 21 | namespace jit { |
| michael@0 | 22 | |
| michael@0 | 23 | class BailoutStack |
| michael@0 | 24 | { |
| michael@0 | 25 | uintptr_t frameClassId_; |
| michael@0 | 26 | mozilla::Array<double, FloatRegisters::Total> fpregs_; |
| michael@0 | 27 | mozilla::Array<uintptr_t, Registers::Total> regs_; |
| michael@0 | 28 | union { |
| michael@0 | 29 | uintptr_t frameSize_; |
| michael@0 | 30 | uintptr_t tableOffset_; |
| michael@0 | 31 | }; |
| michael@0 | 32 | uintptr_t snapshotOffset_; |
| michael@0 | 33 | |
| michael@0 | 34 | public: |
| michael@0 | 35 | FrameSizeClass frameClass() const { |
| michael@0 | 36 | return FrameSizeClass::FromClass(frameClassId_); |
| michael@0 | 37 | } |
| michael@0 | 38 | uintptr_t tableOffset() const { |
| michael@0 | 39 | JS_ASSERT(frameClass() != FrameSizeClass::None()); |
| michael@0 | 40 | return tableOffset_; |
| michael@0 | 41 | } |
| michael@0 | 42 | uint32_t frameSize() const { |
| michael@0 | 43 | if (frameClass() == FrameSizeClass::None()) |
| michael@0 | 44 | return frameSize_; |
| michael@0 | 45 | return frameClass().frameSize(); |
| michael@0 | 46 | } |
| michael@0 | 47 | MachineState machine() { |
| michael@0 | 48 | return MachineState::FromBailout(regs_, fpregs_); |
| michael@0 | 49 | } |
| michael@0 | 50 | SnapshotOffset snapshotOffset() const { |
| michael@0 | 51 | JS_ASSERT(frameClass() == FrameSizeClass::None()); |
| michael@0 | 52 | return snapshotOffset_; |
| michael@0 | 53 | } |
| michael@0 | 54 | uint8_t *parentStackPointer() const { |
| michael@0 | 55 | if (frameClass() == FrameSizeClass::None()) |
| michael@0 | 56 | return (uint8_t *)this + sizeof(BailoutStack); |
| michael@0 | 57 | return (uint8_t *)this + offsetof(BailoutStack, snapshotOffset_); |
| michael@0 | 58 | } |
| michael@0 | 59 | }; |
| michael@0 | 60 | |
| michael@0 | 61 | } // namespace jit |
| michael@0 | 62 | } // namespace js |
| michael@0 | 63 | |
| michael@0 | 64 | #if defined(_WIN32) |
| michael@0 | 65 | # pragma pack(pop) |
| michael@0 | 66 | #endif |
| michael@0 | 67 | |
| michael@0 | 68 | IonBailoutIterator::IonBailoutIterator(const JitActivationIterator &activations, |
| michael@0 | 69 | BailoutStack *bailout) |
| michael@0 | 70 | : JitFrameIterator(activations), |
| michael@0 | 71 | machine_(bailout->machine()) |
| michael@0 | 72 | { |
| michael@0 | 73 | uint8_t *sp = bailout->parentStackPointer(); |
| michael@0 | 74 | uint8_t *fp = sp + bailout->frameSize(); |
| michael@0 | 75 | |
| michael@0 | 76 | current_ = fp; |
| michael@0 | 77 | type_ = JitFrame_IonJS; |
| michael@0 | 78 | topFrameSize_ = current_ - sp; |
| michael@0 | 79 | topIonScript_ = script()->ionScript(); |
| michael@0 | 80 | |
| michael@0 | 81 | if (bailout->frameClass() == FrameSizeClass::None()) { |
| michael@0 | 82 | snapshotOffset_ = bailout->snapshotOffset(); |
| michael@0 | 83 | return; |
| michael@0 | 84 | } |
| michael@0 | 85 | |
| michael@0 | 86 | // Compute the snapshot offset from the bailout ID. |
| michael@0 | 87 | JitActivation *activation = activations.activation()->asJit(); |
| michael@0 | 88 | JSRuntime *rt = activation->compartment()->runtimeFromMainThread(); |
| michael@0 | 89 | JitCode *code = rt->jitRuntime()->getBailoutTable(bailout->frameClass()); |
| michael@0 | 90 | uintptr_t tableOffset = bailout->tableOffset(); |
| michael@0 | 91 | uintptr_t tableStart = reinterpret_cast<uintptr_t>(code->raw()); |
| michael@0 | 92 | |
| michael@0 | 93 | JS_ASSERT(tableOffset >= tableStart && |
| michael@0 | 94 | tableOffset < tableStart + code->instructionsSize()); |
| michael@0 | 95 | JS_ASSERT((tableOffset - tableStart) % BAILOUT_TABLE_ENTRY_SIZE == 0); |
| michael@0 | 96 | |
| michael@0 | 97 | uint32_t bailoutId = ((tableOffset - tableStart) / BAILOUT_TABLE_ENTRY_SIZE) - 1; |
| michael@0 | 98 | JS_ASSERT(bailoutId < BAILOUT_TABLE_SIZE); |
| michael@0 | 99 | |
| michael@0 | 100 | snapshotOffset_ = topIonScript_->bailoutToSnapshot(bailoutId); |
| michael@0 | 101 | } |
| michael@0 | 102 | |
| michael@0 | 103 | IonBailoutIterator::IonBailoutIterator(const JitActivationIterator &activations, |
| michael@0 | 104 | InvalidationBailoutStack *bailout) |
| michael@0 | 105 | : JitFrameIterator(activations), |
| michael@0 | 106 | machine_(bailout->machine()) |
| michael@0 | 107 | { |
| michael@0 | 108 | returnAddressToFp_ = bailout->osiPointReturnAddress(); |
| michael@0 | 109 | topIonScript_ = bailout->ionScript(); |
| michael@0 | 110 | const OsiIndex *osiIndex = topIonScript_->getOsiIndex(returnAddressToFp_); |
| michael@0 | 111 | |
| michael@0 | 112 | current_ = (uint8_t*) bailout->fp(); |
| michael@0 | 113 | type_ = JitFrame_IonJS; |
| michael@0 | 114 | topFrameSize_ = current_ - bailout->sp(); |
| michael@0 | 115 | snapshotOffset_ = osiIndex->snapshotOffset(); |
| michael@0 | 116 | } |
