| // Copyright (c) 2012, 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_IA32. |
| #if defined(TARGET_ARCH_IA32) |
| |
| #include "vm/assembler.h" |
| #include "vm/code_patcher.h" |
| #include "vm/cpu.h" |
| #include "vm/dart_entry.h" |
| #include "vm/instructions.h" |
| #include "vm/object.h" |
| #include "vm/raw_object.h" |
| |
| namespace dart { |
| |
| // The expected pattern of a Dart unoptimized call (static and instance): |
| // mov ECX, ic-data |
| // call target_address (stub) |
| // <- return address |
| class UnoptimizedCall : public ValueObject { |
| public: |
| explicit UnoptimizedCall(uword return_address) |
| : start_(return_address - (kNumInstructions * kInstructionSize)) { |
| ASSERT(IsValid(return_address)); |
| ASSERT(kInstructionSize == Assembler::kCallExternalLabelSize); |
| } |
| |
| static bool IsValid(uword return_address) { |
| uint8_t* code_bytes = |
| reinterpret_cast<uint8_t*>( |
| return_address - (kNumInstructions * kInstructionSize)); |
| return (code_bytes[0] == 0xB9) && |
| (code_bytes[1 * kInstructionSize] == 0xE8); |
| } |
| |
| uword target() const { |
| const uword offset = *reinterpret_cast<uword*>(call_address() + 1); |
| return return_address() + offset; |
| } |
| |
| void set_target(uword target) const { |
| uword* target_addr = reinterpret_cast<uword*>(call_address() + 1); |
| uword offset = target - return_address(); |
| *target_addr = offset; |
| CPU::FlushICache(call_address(), kInstructionSize); |
| } |
| |
| RawObject* ic_data() const { |
| return *reinterpret_cast<RawObject**>(start_ + 1); |
| } |
| |
| static const int kNumInstructions = 2; |
| static const int kInstructionSize = 5; // All instructions have same length. |
| |
| private: |
| uword return_address() const { |
| return start_ + kNumInstructions * kInstructionSize; |
| } |
| |
| uword call_address() const { |
| return start_ + 1 * kInstructionSize; |
| } |
| |
| uword start_; |
| DISALLOW_IMPLICIT_CONSTRUCTORS(UnoptimizedCall); |
| }; |
| |
| |
| class InstanceCall : public UnoptimizedCall { |
| public: |
| explicit InstanceCall(uword return_address) |
| : UnoptimizedCall(return_address) { |
| #if defined(DEBUG) |
| ICData& test_ic_data = ICData::Handle(); |
| test_ic_data ^= ic_data(); |
| ASSERT(test_ic_data.num_args_tested() > 0); |
| #endif // DEBUG |
| } |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(InstanceCall); |
| }; |
| |
| |
| class UnoptimizedStaticCall : public UnoptimizedCall { |
| public: |
| explicit UnoptimizedStaticCall(uword return_address) |
| : UnoptimizedCall(return_address) { |
| #if defined(DEBUG) |
| ICData& test_ic_data = ICData::Handle(); |
| test_ic_data ^= ic_data(); |
| ASSERT(test_ic_data.num_args_tested() >= 0); |
| #endif // DEBUG |
| } |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(UnoptimizedStaticCall); |
| }; |
| |
| |
| // The expected pattern of a dart static call: |
| // mov EDX, arguments_descriptor_array (optional in polymorphic calls) |
| // call target_address |
| // <- return address |
| class StaticCall : public ValueObject { |
| public: |
| explicit StaticCall(uword return_address) |
| : start_(return_address - (kNumInstructions * kInstructionSize)) { |
| ASSERT(IsValid(return_address)); |
| ASSERT(kInstructionSize == Assembler::kCallExternalLabelSize); |
| } |
| |
| static bool IsValid(uword return_address) { |
| uint8_t* code_bytes = |
| reinterpret_cast<uint8_t*>( |
| return_address - (kNumInstructions * kInstructionSize)); |
| return (code_bytes[0] == 0xE8); |
| } |
| |
| uword target() const { |
| const uword offset = *reinterpret_cast<uword*>(call_address() + 1); |
| return return_address() + offset; |
| } |
| |
| void set_target(uword target) const { |
| uword* target_addr = reinterpret_cast<uword*>(call_address() + 1); |
| uword offset = target - return_address(); |
| *target_addr = offset; |
| CPU::FlushICache(call_address(), kInstructionSize); |
| } |
| |
| static const int kNumInstructions = 1; |
| static const int kInstructionSize = 5; // All instructions have same length. |
| |
| private: |
| uword return_address() const { |
| return start_ + kNumInstructions * kInstructionSize; |
| } |
| |
| uword call_address() const { |
| return start_; |
| } |
| |
| uword start_; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(StaticCall); |
| }; |
| |
| |
| // The expected pattern of a dart closure call: |
| // mov EDX, arguments_descriptor_array |
| // call target_address |
| // <- return address |
| class ClosureCall : public ValueObject { |
| public: |
| explicit ClosureCall(uword return_address) |
| : start_(return_address - (kInstr1Size + kInstr2Size)) { |
| ASSERT(IsValid(return_address)); |
| ASSERT(kInstr2Size == Assembler::kCallExternalLabelSize); |
| } |
| |
| static bool IsValid(uword return_address) { |
| uint8_t* code_bytes = reinterpret_cast<uint8_t*>( |
| return_address - (kInstr1Size + kInstr2Size)); |
| return (code_bytes[0] == 0xBA) && (code_bytes[kInstr1Size] == 0xE8); |
| } |
| |
| RawArray* arguments_descriptor() const { |
| return *reinterpret_cast<RawArray**>(start_ + 1); |
| } |
| |
| private: |
| static const int kInstr1Size = 5; // mov EDX, arguments descriptor array |
| static const int kInstr2Size = 5; // call stub |
| |
| uword return_address() const { |
| return start_ + kInstr1Size + kInstr2Size; |
| } |
| uword call_address() const { return start_; } |
| |
| uword start_; |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ClosureCall); |
| }; |
| |
| |
| |
| RawArray* CodePatcher::GetClosureArgDescAt(uword return_address, |
| const Code& code) { |
| ASSERT(code.ContainsInstructionAt(return_address)); |
| ClosureCall call(return_address); |
| return call.arguments_descriptor(); |
| } |
| |
| |
| uword CodePatcher::GetStaticCallTargetAt(uword return_address, |
| const Code& code) { |
| ASSERT(code.ContainsInstructionAt(return_address)); |
| StaticCall call(return_address); |
| return call.target(); |
| } |
| |
| |
| void CodePatcher::PatchStaticCallAt(uword return_address, |
| const Code& code, |
| uword new_target) { |
| ASSERT(code.ContainsInstructionAt(return_address)); |
| StaticCall call(return_address); |
| call.set_target(new_target); |
| } |
| |
| |
| void CodePatcher::PatchInstanceCallAt(uword return_address, |
| const Code& code, |
| uword new_target) { |
| ASSERT(code.ContainsInstructionAt(return_address)); |
| InstanceCall call(return_address); |
| call.set_target(new_target); |
| } |
| |
| |
| |
| void CodePatcher::InsertCallAt(uword start, uword target) { |
| // The inserted call should not overlap the lazy deopt jump code. |
| ASSERT(start + CallPattern::InstructionLength() <= target); |
| *reinterpret_cast<uint8_t*>(start) = 0xE8; |
| CallPattern call(start); |
| call.SetTargetAddress(target); |
| CPU::FlushICache(start, CallPattern::InstructionLength()); |
| } |
| |
| |
| uword CodePatcher::GetInstanceCallAt( |
| uword return_address, const Code& code, ICData* ic_data) { |
| ASSERT(code.ContainsInstructionAt(return_address)); |
| InstanceCall call(return_address); |
| if (ic_data != NULL) { |
| *ic_data ^= call.ic_data(); |
| } |
| return call.target(); |
| } |
| |
| |
| RawFunction* CodePatcher::GetUnoptimizedStaticCallAt( |
| uword return_address, const Code& code, ICData* ic_data_result) { |
| ASSERT(code.ContainsInstructionAt(return_address)); |
| UnoptimizedStaticCall static_call(return_address); |
| ICData& ic_data = ICData::Handle(); |
| ic_data ^= static_call.ic_data(); |
| if (ic_data_result != NULL) { |
| *ic_data_result = ic_data.raw(); |
| } |
| return ic_data.GetTargetAt(0); |
| } |
| |
| |
| intptr_t CodePatcher::InstanceCallSizeInBytes() { |
| return InstanceCall::kNumInstructions * InstanceCall::kInstructionSize; |
| } |
| |
| } // namespace dart |
| |
| #endif // defined TARGET_ARCH_IA32 |