| // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| #include "vm/globals.h" // Needed here to get TARGET_ARCH_ARM64. |
| #if defined(TARGET_ARCH_ARM64) |
| |
| #include "vm/code_patcher.h" |
| #include "vm/cpu.h" |
| #include "vm/instructions.h" |
| #include "vm/object.h" |
| |
| namespace dart { |
| |
| class PoolPointerCall : public ValueObject { |
| public: |
| PoolPointerCall(uword pc, const Code& code) |
| : end_(pc), object_pool_(ObjectPool::Handle(code.GetObjectPool())) { |
| // Last instruction: blr lr. |
| ASSERT(*(reinterpret_cast<uint32_t*>(end_) - 1) == 0xd63f03c0); |
| InstructionPattern::DecodeLoadWordFromPool(end_ - 2 * Instr::kInstrSize, |
| ®_, &index_); |
| } |
| |
| intptr_t pp_index() const { return index_; } |
| |
| CodePtr Target() const { |
| return static_cast<CodePtr>(object_pool_.ObjectAt(pp_index())); |
| } |
| |
| void SetTarget(const Code& target) const { |
| object_pool_.SetObjectAt(pp_index(), target); |
| // No need to flush the instruction cache, since the code is not modified. |
| } |
| |
| private: |
| static const int kCallPatternSize = 3 * Instr::kInstrSize; |
| uword end_; |
| const ObjectPool& object_pool_; |
| Register reg_; |
| intptr_t index_; |
| DISALLOW_IMPLICIT_CONSTRUCTORS(PoolPointerCall); |
| }; |
| |
| CodePtr CodePatcher::GetStaticCallTargetAt(uword return_address, |
| const Code& code) { |
| ASSERT(code.ContainsInstructionAt(return_address)); |
| PoolPointerCall call(return_address, code); |
| return call.Target(); |
| } |
| |
| void CodePatcher::PatchStaticCallAt(uword return_address, |
| const Code& code, |
| const Code& new_target) { |
| PatchPoolPointerCallAt(return_address, code, new_target); |
| } |
| |
| void CodePatcher::PatchPoolPointerCallAt(uword return_address, |
| const Code& code, |
| const Code& new_target) { |
| ASSERT(code.ContainsInstructionAt(return_address)); |
| PoolPointerCall call(return_address, code); |
| call.SetTarget(new_target); |
| } |
| |
| void CodePatcher::InsertDeoptimizationCallAt(uword start) { |
| UNREACHABLE(); |
| } |
| |
| CodePtr CodePatcher::GetInstanceCallAt(uword return_address, |
| const Code& caller_code, |
| Object* data) { |
| ASSERT(caller_code.ContainsInstructionAt(return_address)); |
| ICCallPattern call(return_address, caller_code); |
| if (data != NULL) { |
| *data = call.Data(); |
| } |
| return call.TargetCode(); |
| } |
| |
| void CodePatcher::PatchInstanceCallAt(uword return_address, |
| const Code& caller_code, |
| const Object& data, |
| const Code& target) { |
| auto thread = Thread::Current(); |
| thread->isolate_group()->RunWithStoppedMutators([&]() { |
| PatchInstanceCallAtWithMutatorsStopped(thread, return_address, caller_code, |
| data, target); |
| }); |
| } |
| |
| void CodePatcher::PatchInstanceCallAtWithMutatorsStopped( |
| Thread* thread, |
| uword return_address, |
| const Code& caller_code, |
| const Object& data, |
| const Code& target) { |
| ASSERT(caller_code.ContainsInstructionAt(return_address)); |
| ICCallPattern call(return_address, caller_code); |
| call.SetData(data); |
| call.SetTargetCode(target); |
| } |
| |
| FunctionPtr CodePatcher::GetUnoptimizedStaticCallAt(uword return_address, |
| const Code& code, |
| ICData* ic_data_result) { |
| ASSERT(code.ContainsInstructionAt(return_address)); |
| ICCallPattern static_call(return_address, code); |
| ICData& ic_data = ICData::Handle(); |
| ic_data ^= static_call.Data(); |
| if (ic_data_result != NULL) { |
| *ic_data_result = ic_data.ptr(); |
| } |
| return ic_data.GetTargetAt(0); |
| } |
| |
| void CodePatcher::PatchSwitchableCallAt(uword return_address, |
| const Code& caller_code, |
| const Object& data, |
| const Code& target) { |
| auto thread = Thread::Current(); |
| // Ensure all threads are suspended as we update data and target pair. |
| thread->isolate_group()->RunWithStoppedMutators([&]() { |
| PatchSwitchableCallAtWithMutatorsStopped(thread, return_address, |
| caller_code, data, target); |
| }); |
| } |
| |
| void CodePatcher::PatchSwitchableCallAtWithMutatorsStopped( |
| Thread* thread, |
| uword return_address, |
| const Code& caller_code, |
| const Object& data, |
| const Code& target) { |
| if (FLAG_precompiled_mode && FLAG_use_bare_instructions) { |
| BareSwitchableCallPattern call(return_address); |
| call.SetData(data); |
| call.SetTarget(target); |
| } else { |
| SwitchableCallPattern call(return_address, caller_code); |
| call.SetData(data); |
| call.SetTarget(target); |
| } |
| } |
| |
| uword CodePatcher::GetSwitchableCallTargetEntryAt(uword return_address, |
| const Code& caller_code) { |
| if (FLAG_precompiled_mode && FLAG_use_bare_instructions) { |
| BareSwitchableCallPattern call(return_address); |
| return call.target_entry(); |
| } else { |
| SwitchableCallPattern call(return_address, caller_code); |
| return call.target_entry(); |
| } |
| } |
| |
| ObjectPtr CodePatcher::GetSwitchableCallDataAt(uword return_address, |
| const Code& caller_code) { |
| if (FLAG_precompiled_mode && FLAG_use_bare_instructions) { |
| BareSwitchableCallPattern call(return_address); |
| return call.data(); |
| } else { |
| SwitchableCallPattern call(return_address, caller_code); |
| return call.data(); |
| } |
| } |
| |
| void CodePatcher::PatchNativeCallAt(uword return_address, |
| const Code& caller_code, |
| NativeFunction target, |
| const Code& trampoline) { |
| Thread::Current()->isolate_group()->RunWithStoppedMutators([&]() { |
| ASSERT(caller_code.ContainsInstructionAt(return_address)); |
| NativeCallPattern call(return_address, caller_code); |
| call.set_target(trampoline); |
| call.set_native_function(target); |
| }); |
| } |
| |
| CodePtr CodePatcher::GetNativeCallAt(uword return_address, |
| const Code& caller_code, |
| NativeFunction* target) { |
| ASSERT(caller_code.ContainsInstructionAt(return_address)); |
| NativeCallPattern call(return_address, caller_code); |
| *target = call.native_function(); |
| return call.target(); |
| } |
| |
| } // namespace dart |
| |
| #endif // defined TARGET_ARCH_ARM64 |