1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2  * vim: set ts=8 sts=2 et sw=2 tw=80:
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 "jit/Bailouts.h"
8 #include "jit/JitFrames.h"
9 #include "jit/SafepointIndex.h"
10 #include "jit/ScriptFromCalleeToken.h"
11 
12 #include "vm/JSScript-inl.h"
13 
14 using namespace js;
15 using namespace js::jit;
16 
17 namespace js {
18 namespace jit {
19 
20 class BailoutStack {
21   RegisterDump::FPUArray fpregs_;
22   RegisterDump::GPRArray regs_;
23   uintptr_t frameSize_;
24   uintptr_t snapshotOffset_;
25 
26  public:
machineState()27   MachineState machineState() {
28     return MachineState::FromBailout(regs_, fpregs_);
29   }
snapshotOffset() const30   uint32_t snapshotOffset() const { return snapshotOffset_; }
frameSize() const31   uint32_t frameSize() const { return frameSize_; }
parentStackPointer()32   uint8_t* parentStackPointer() {
33     return (uint8_t*)this + sizeof(BailoutStack);
34   }
35 };
36 
37 }  // namespace jit
38 }  // namespace js
39 
BailoutFrameInfo(const JitActivationIterator & activations,BailoutStack * bailout)40 BailoutFrameInfo::BailoutFrameInfo(const JitActivationIterator& activations,
41                                    BailoutStack* bailout)
42     : machine_(bailout->machineState()) {
43   uint8_t* sp = bailout->parentStackPointer();
44   framePointer_ = sp + bailout->frameSize();
45   topFrameSize_ = framePointer_ - sp;
46 
47   JSScript* script =
48       ScriptFromCalleeToken(((JitFrameLayout*)framePointer_)->calleeToken());
49   topIonScript_ = script->ionScript();
50 
51   attachOnJitActivation(activations);
52   snapshotOffset_ = bailout->snapshotOffset();
53 }
54 
BailoutFrameInfo(const JitActivationIterator & activations,InvalidationBailoutStack * bailout)55 BailoutFrameInfo::BailoutFrameInfo(const JitActivationIterator& activations,
56                                    InvalidationBailoutStack* bailout)
57     : machine_(bailout->machine()) {
58   framePointer_ = (uint8_t*)bailout->fp();
59   topFrameSize_ = framePointer_ - bailout->sp();
60   topIonScript_ = bailout->ionScript();
61   attachOnJitActivation(activations);
62 
63   uint8_t* returnAddressToFp_ = bailout->osiPointReturnAddress();
64   const OsiIndex* osiIndex = topIonScript_->getOsiIndex(returnAddressToFp_);
65   snapshotOffset_ = osiIndex->snapshotOffset();
66 }
67