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comparison: js/src/jit/arm/Bailouts-arm.cpp
js/src/jit/arm/Bailouts-arm.cpp
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| -1:000000000000 | 0:52bd493017a7 |
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * vim: set ts=8 sts=4 et sw=4 tw=99: | |
| 3 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #include "jscntxt.h" | |
| 8 #include "jscompartment.h" | |
| 9 | |
| 10 #include "jit/Bailouts.h" | |
| 11 #include "jit/JitCompartment.h" | |
| 12 | |
| 13 using namespace js; | |
| 14 using namespace js::jit; | |
| 15 | |
| 16 namespace js { | |
| 17 namespace jit { | |
| 18 | |
| 19 class BailoutStack | |
| 20 { | |
| 21 uintptr_t frameClassId_; | |
| 22 // This is pushed in the bailout handler. Both entry points into the handler | |
| 23 // inserts their own value int lr, which is then placed onto the stack along | |
| 24 // with frameClassId_ above. This should be migrated to ip. | |
| 25 public: | |
| 26 union { | |
| 27 uintptr_t frameSize_; | |
| 28 uintptr_t tableOffset_; | |
| 29 }; | |
| 30 | |
| 31 protected: // Silence Clang warning about unused private fields. | |
| 32 mozilla::Array<double, FloatRegisters::Total> fpregs_; | |
| 33 mozilla::Array<uintptr_t, Registers::Total> regs_; | |
| 34 | |
| 35 uintptr_t snapshotOffset_; | |
| 36 uintptr_t padding_; | |
| 37 | |
| 38 public: | |
| 39 FrameSizeClass frameClass() const { | |
| 40 return FrameSizeClass::FromClass(frameClassId_); | |
| 41 } | |
| 42 uintptr_t tableOffset() const { | |
| 43 JS_ASSERT(frameClass() != FrameSizeClass::None()); | |
| 44 return tableOffset_; | |
| 45 } | |
| 46 uint32_t frameSize() const { | |
| 47 if (frameClass() == FrameSizeClass::None()) | |
| 48 return frameSize_; | |
| 49 return frameClass().frameSize(); | |
| 50 } | |
| 51 MachineState machine() { | |
| 52 return MachineState::FromBailout(regs_, fpregs_); | |
| 53 } | |
| 54 SnapshotOffset snapshotOffset() const { | |
| 55 JS_ASSERT(frameClass() == FrameSizeClass::None()); | |
| 56 return snapshotOffset_; | |
| 57 } | |
| 58 uint8_t *parentStackPointer() const { | |
| 59 if (frameClass() == FrameSizeClass::None()) | |
| 60 return (uint8_t *)this + sizeof(BailoutStack); | |
| 61 return (uint8_t *)this + offsetof(BailoutStack, snapshotOffset_); | |
| 62 } | |
| 63 }; | |
| 64 | |
| 65 // Make sure the compiler doesn't add extra padding. | |
| 66 static_assert((sizeof(BailoutStack) % 8) == 0, "BailoutStack should be 8-byte aligned."); | |
| 67 | |
| 68 } // namespace jit | |
| 69 } // namespace js | |
| 70 | |
| 71 IonBailoutIterator::IonBailoutIterator(const JitActivationIterator &activations, | |
| 72 BailoutStack *bailout) | |
| 73 : JitFrameIterator(activations), | |
| 74 machine_(bailout->machine()) | |
| 75 { | |
| 76 uint8_t *sp = bailout->parentStackPointer(); | |
| 77 uint8_t *fp = sp + bailout->frameSize(); | |
| 78 | |
| 79 current_ = fp; | |
| 80 type_ = JitFrame_IonJS; | |
| 81 topFrameSize_ = current_ - sp; | |
| 82 topIonScript_ = script()->ionScript(); | |
| 83 | |
| 84 if (bailout->frameClass() == FrameSizeClass::None()) { | |
| 85 snapshotOffset_ = bailout->snapshotOffset(); | |
| 86 return; | |
| 87 } | |
| 88 | |
| 89 // Compute the snapshot offset from the bailout ID. | |
| 90 JitActivation *activation = activations.activation()->asJit(); | |
| 91 JSRuntime *rt = activation->compartment()->runtimeFromMainThread(); | |
| 92 JitCode *code = rt->jitRuntime()->getBailoutTable(bailout->frameClass()); | |
| 93 uintptr_t tableOffset = bailout->tableOffset(); | |
| 94 uintptr_t tableStart = reinterpret_cast<uintptr_t>(code->raw()); | |
| 95 | |
| 96 JS_ASSERT(tableOffset >= tableStart && | |
| 97 tableOffset < tableStart + code->instructionsSize()); | |
| 98 JS_ASSERT((tableOffset - tableStart) % BAILOUT_TABLE_ENTRY_SIZE == 0); | |
| 99 | |
| 100 uint32_t bailoutId = ((tableOffset - tableStart) / BAILOUT_TABLE_ENTRY_SIZE) - 1; | |
| 101 JS_ASSERT(bailoutId < BAILOUT_TABLE_SIZE); | |
| 102 | |
| 103 snapshotOffset_ = topIonScript_->bailoutToSnapshot(bailoutId); | |
| 104 } | |
| 105 | |
| 106 IonBailoutIterator::IonBailoutIterator(const JitActivationIterator &activations, | |
| 107 InvalidationBailoutStack *bailout) | |
| 108 : JitFrameIterator(activations), | |
| 109 machine_(bailout->machine()) | |
| 110 { | |
| 111 returnAddressToFp_ = bailout->osiPointReturnAddress(); | |
| 112 topIonScript_ = bailout->ionScript(); | |
| 113 const OsiIndex *osiIndex = topIonScript_->getOsiIndex(returnAddressToFp_); | |
| 114 | |
| 115 current_ = (uint8_t*) bailout->fp(); | |
| 116 type_ = JitFrame_IonJS; | |
| 117 topFrameSize_ = current_ - bailout->sp(); | |
| 118 snapshotOffset_ = osiIndex->snapshotOffset(); | |
| 119 } |
