| // 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/code_patcher.h" |
| #include "vm/compiler/assembler/assembler.h" |
| #include "vm/compiler/backend/flow_graph_compiler.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 |
| // mov EDI, target-code-object |
| // call target_address (stub) |
| // <- return address |
| class UnoptimizedCall : public ValueObject { |
| public: |
| explicit UnoptimizedCall(uword return_address) |
| : start_(return_address - kPatternSize) { |
| ASSERT(IsValid()); |
| } |
| |
| RawObject* ic_data() const { |
| return *reinterpret_cast<RawObject**>(start_ + 1); |
| } |
| |
| static const int kMovInstructionSize = 5; |
| static const int kCallInstructionSize = 3; |
| static const int kPatternSize = |
| 2 * kMovInstructionSize + kCallInstructionSize; |
| |
| private: |
| bool IsValid() { |
| uint8_t* code_bytes = reinterpret_cast<uint8_t*>(start_); |
| return (code_bytes[0] == 0xB9) && |
| (code_bytes[2 * kMovInstructionSize] == 0xFF); |
| } |
| |
| uword return_address() const { return start_ + kPatternSize; } |
| |
| uword call_address() const { return start_ + 2 * kMovInstructionSize; } |
| |
| protected: |
| uword start_; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(UnoptimizedCall); |
| }; |
| |
| class NativeCall : public UnoptimizedCall { |
| public: |
| explicit NativeCall(uword return_address) : UnoptimizedCall(return_address) {} |
| |
| NativeFunction native_function() const { |
| return *reinterpret_cast<NativeFunction*>(start_ + 1); |
| } |
| |
| void set_native_function(NativeFunction func) const { |
| WritableInstructionsScope writable(start_ + 1, sizeof(func)); |
| *reinterpret_cast<NativeFunction*>(start_ + 1) = func; |
| } |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(NativeCall); |
| }; |
| |
| 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.NumArgsTested() > 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.NumArgsTested() >= 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) |
| // mov EDI, Immediate(code_object) |
| // call [EDI + entry_point_offset] |
| // <- return address |
| class StaticCall : public ValueObject { |
| public: |
| explicit StaticCall(uword return_address) |
| : start_(return_address - (kMovInstructionSize + kCallInstructionSize)) { |
| ASSERT(IsValid()); |
| } |
| |
| bool IsValid() { |
| uint8_t* code_bytes = reinterpret_cast<uint8_t*>(start_); |
| return (code_bytes[0] == 0xBF) && (code_bytes[5] == 0xFF); |
| } |
| |
| RawCode* target() const { |
| const uword imm = *reinterpret_cast<uword*>(start_ + 1); |
| return reinterpret_cast<RawCode*>(imm); |
| } |
| |
| void set_target(const Code& target) const { |
| uword* target_addr = reinterpret_cast<uword*>(start_ + 1); |
| uword imm = reinterpret_cast<uword>(target.raw()); |
| *target_addr = imm; |
| CPU::FlushICache(start_ + 1, sizeof(imm)); |
| } |
| |
| static const int kMovInstructionSize = 5; |
| static const int kCallInstructionSize = 3; |
| |
| private: |
| uword return_address() const { |
| return start_ + kMovInstructionSize + kCallInstructionSize; |
| } |
| |
| uword call_address() const { return start_ + kMovInstructionSize; } |
| |
| uword start_; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(StaticCall); |
| }; |
| |
| RawCode* 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, |
| const Code& new_target) { |
| const Instructions& instrs = Instructions::Handle(code.instructions()); |
| WritableInstructionsScope writable(instrs.PayloadStart(), instrs.Size()); |
| ASSERT(code.ContainsInstructionAt(return_address)); |
| StaticCall call(return_address); |
| call.set_target(new_target); |
| } |
| |
| void CodePatcher::InsertDeoptimizationCallAt(uword start) { |
| UNREACHABLE(); |
| } |
| |
| RawCode* 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 Code::null(); |
| } |
| |
| 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); |
| } |
| |
| void CodePatcher::PatchSwitchableCallAt(uword return_address, |
| const Code& caller_code, |
| const Object& data, |
| const Code& target) { |
| // Switchable instance calls only generated for precompilation. |
| UNREACHABLE(); |
| } |
| |
| RawCode* CodePatcher::GetSwitchableCallTargetAt(uword return_address, |
| const Code& caller_code) { |
| // Switchable instance calls only generated for precompilation. |
| UNREACHABLE(); |
| return Code::null(); |
| } |
| |
| RawObject* CodePatcher::GetSwitchableCallDataAt(uword return_address, |
| const Code& caller_code) { |
| // Switchable instance calls only generated for precompilation. |
| UNREACHABLE(); |
| return Object::null(); |
| } |
| |
| void CodePatcher::PatchNativeCallAt(uword return_address, |
| const Code& code, |
| NativeFunction target, |
| const Code& trampoline) { |
| UNREACHABLE(); |
| } |
| |
| RawCode* CodePatcher::GetNativeCallAt(uword return_address, |
| const Code& code, |
| NativeFunction* target) { |
| UNREACHABLE(); |
| return NULL; |
| } |
| |
| } // namespace dart |
| |
| #endif // defined TARGET_ARCH_IA32 |