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/mips32/Bailouts-mips32.h" 8 9 #include "jit/JitFrames.h" 10 #include "jit/JitRuntime.h" 11 #include "jit/ScriptFromCalleeToken.h" 12 #include "vm/JSContext.h" 13 #include "vm/Realm.h" 14 15 #include "vm/JSScript-inl.h" 16 17 using namespace js; 18 using namespace js::jit; 19 BailoutFrameInfo(const JitActivationIterator & activations,BailoutStack * bailout)20BailoutFrameInfo::BailoutFrameInfo(const JitActivationIterator& activations, 21 BailoutStack* bailout) 22 : machine_(bailout->machine()) { 23 uint8_t* sp = bailout->parentStackPointer(); 24 framePointer_ = sp + bailout->frameSize(); 25 topFrameSize_ = framePointer_ - sp; 26 27 JSScript* script = 28 ScriptFromCalleeToken(((JitFrameLayout*)framePointer_)->calleeToken()); 29 JitActivation* activation = activations.activation()->asJit(); 30 topIonScript_ = script->ionScript(); 31 32 attachOnJitActivation(activations); 33 34 if (bailout->frameClass() == FrameSizeClass::None()) { 35 snapshotOffset_ = bailout->snapshotOffset(); 36 return; 37 } 38 39 // Compute the snapshot offset from the bailout ID. 40 JSRuntime* rt = activation->compartment()->runtimeFromMainThread(); 41 TrampolinePtr code = rt->jitRuntime()->getBailoutTable(bailout->frameClass()); 42 #ifdef DEBUG 43 uint32_t tableSize = 44 rt->jitRuntime()->getBailoutTableSize(bailout->frameClass()); 45 #endif 46 uintptr_t tableOffset = bailout->tableOffset(); 47 uintptr_t tableStart = reinterpret_cast<uintptr_t>(code.value); 48 49 MOZ_ASSERT(tableOffset >= tableStart && tableOffset < tableStart + tableSize); 50 MOZ_ASSERT((tableOffset - tableStart) % BAILOUT_TABLE_ENTRY_SIZE == 0); 51 52 uint32_t bailoutId = 53 ((tableOffset - tableStart) / BAILOUT_TABLE_ENTRY_SIZE) - 1; 54 MOZ_ASSERT(bailoutId < BAILOUT_TABLE_SIZE); 55 56 snapshotOffset_ = topIonScript_->bailoutToSnapshot(bailoutId); 57 } 58