mirror of
https://github.com/dart-lang/sdk
synced 2024-09-16 01:45:06 +00:00
8a179fb953
New folder structure (nested under vm/): - compiler/ - jit/ - JIT specific code - aot/ - AOT specific code - backend/ - all middle-end and back-end code (IL, flow graph) - assembler/ - assemblers and disassemblers - frontend/ - front ends (AST -> IL, Kernel -> IL) compiler/README.md would be the documentation root for the compiler pipeline Bug: https://github.com/dart-lang/sdk/issues/30575 Change-Id: I2dfd9688793bff737f7632ddc77fca766875ce36 Reviewed-on: https://dart-review.googlesource.com/2940 Reviewed-by: Vyacheslav Egorov <vegorov@google.com> Commit-Queue: Vyacheslav Egorov <vegorov@google.com>
237 lines
7.1 KiB
C++
237 lines
7.1 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/globals.h" // Needed here to get TARGET_ARCH_IA32.
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#if defined(TARGET_ARCH_IA32)
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#include "vm/code_patcher.h"
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#include "vm/compiler/assembler/assembler.h"
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#include "vm/compiler/backend/flow_graph_compiler.h"
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#include "vm/cpu.h"
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#include "vm/dart_entry.h"
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#include "vm/instructions.h"
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#include "vm/object.h"
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#include "vm/raw_object.h"
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namespace dart {
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// The expected pattern of a Dart unoptimized call (static and instance):
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// mov ECX, ic-data
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// mov EDI, target-code-object
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// call target_address (stub)
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// <- return address
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class UnoptimizedCall : public ValueObject {
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public:
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explicit UnoptimizedCall(uword return_address)
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: start_(return_address - kPatternSize) {
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ASSERT(IsValid());
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}
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RawObject* ic_data() const {
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return *reinterpret_cast<RawObject**>(start_ + 1);
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}
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static const int kMovInstructionSize = 5;
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static const int kCallInstructionSize = 3;
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static const int kPatternSize =
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2 * kMovInstructionSize + kCallInstructionSize;
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private:
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bool IsValid() {
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uint8_t* code_bytes = reinterpret_cast<uint8_t*>(start_);
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return (code_bytes[0] == 0xB9) &&
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(code_bytes[2 * kMovInstructionSize] == 0xFF);
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}
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uword return_address() const { return start_ + kPatternSize; }
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uword call_address() const { return start_ + 2 * kMovInstructionSize; }
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protected:
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uword start_;
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(UnoptimizedCall);
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};
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class NativeCall : public UnoptimizedCall {
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public:
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explicit NativeCall(uword return_address) : UnoptimizedCall(return_address) {}
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NativeFunction native_function() const {
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return *reinterpret_cast<NativeFunction*>(start_ + 1);
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}
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void set_native_function(NativeFunction func) const {
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WritableInstructionsScope writable(start_ + 1, sizeof(func));
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*reinterpret_cast<NativeFunction*>(start_ + 1) = func;
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}
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(NativeCall);
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};
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class InstanceCall : public UnoptimizedCall {
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public:
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explicit InstanceCall(uword return_address)
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: UnoptimizedCall(return_address) {
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#if defined(DEBUG)
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ICData& test_ic_data = ICData::Handle();
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test_ic_data ^= ic_data();
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ASSERT(test_ic_data.NumArgsTested() > 0);
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#endif // DEBUG
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}
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(InstanceCall);
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};
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class UnoptimizedStaticCall : public UnoptimizedCall {
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public:
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explicit UnoptimizedStaticCall(uword return_address)
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: UnoptimizedCall(return_address) {
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#if defined(DEBUG)
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ICData& test_ic_data = ICData::Handle();
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test_ic_data ^= ic_data();
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ASSERT(test_ic_data.NumArgsTested() >= 0);
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#endif // DEBUG
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}
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(UnoptimizedStaticCall);
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};
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// The expected pattern of a dart static call:
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// mov EDX, arguments_descriptor_array (optional in polymorphic calls)
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// mov EDI, Immediate(code_object)
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// call [EDI + entry_point_offset]
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// <- return address
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class StaticCall : public ValueObject {
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public:
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explicit StaticCall(uword return_address)
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: start_(return_address - (kMovInstructionSize + kCallInstructionSize)) {
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ASSERT(IsValid());
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}
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bool IsValid() {
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uint8_t* code_bytes = reinterpret_cast<uint8_t*>(start_);
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return (code_bytes[0] == 0xBF) && (code_bytes[5] == 0xFF);
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}
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RawCode* target() const {
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const uword imm = *reinterpret_cast<uword*>(start_ + 1);
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return reinterpret_cast<RawCode*>(imm);
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}
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void set_target(const Code& target) const {
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uword* target_addr = reinterpret_cast<uword*>(start_ + 1);
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uword imm = reinterpret_cast<uword>(target.raw());
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*target_addr = imm;
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CPU::FlushICache(start_ + 1, sizeof(imm));
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}
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static const int kMovInstructionSize = 5;
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static const int kCallInstructionSize = 3;
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private:
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uword return_address() const {
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return start_ + kMovInstructionSize + kCallInstructionSize;
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}
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uword call_address() const { return start_ + kMovInstructionSize; }
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uword start_;
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DISALLOW_IMPLICIT_CONSTRUCTORS(StaticCall);
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};
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RawCode* CodePatcher::GetStaticCallTargetAt(uword return_address,
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const Code& code) {
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ASSERT(code.ContainsInstructionAt(return_address));
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StaticCall call(return_address);
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return call.target();
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}
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void CodePatcher::PatchStaticCallAt(uword return_address,
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const Code& code,
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const Code& new_target) {
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const Instructions& instrs = Instructions::Handle(code.instructions());
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WritableInstructionsScope writable(instrs.PayloadStart(), instrs.Size());
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ASSERT(code.ContainsInstructionAt(return_address));
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StaticCall call(return_address);
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call.set_target(new_target);
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}
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void CodePatcher::InsertDeoptimizationCallAt(uword start) {
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UNREACHABLE();
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}
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RawCode* CodePatcher::GetInstanceCallAt(uword return_address,
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const Code& code,
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ICData* ic_data) {
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ASSERT(code.ContainsInstructionAt(return_address));
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InstanceCall call(return_address);
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if (ic_data != NULL) {
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*ic_data ^= call.ic_data();
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}
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return Code::null();
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}
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RawFunction* CodePatcher::GetUnoptimizedStaticCallAt(uword return_address,
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const Code& code,
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ICData* ic_data_result) {
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ASSERT(code.ContainsInstructionAt(return_address));
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UnoptimizedStaticCall static_call(return_address);
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ICData& ic_data = ICData::Handle();
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ic_data ^= static_call.ic_data();
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if (ic_data_result != NULL) {
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*ic_data_result = ic_data.raw();
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}
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return ic_data.GetTargetAt(0);
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}
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void CodePatcher::PatchSwitchableCallAt(uword return_address,
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const Code& caller_code,
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const Object& data,
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const Code& target) {
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// Switchable instance calls only generated for precompilation.
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UNREACHABLE();
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}
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RawCode* CodePatcher::GetSwitchableCallTargetAt(uword return_address,
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const Code& caller_code) {
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// Switchable instance calls only generated for precompilation.
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UNREACHABLE();
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return Code::null();
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}
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RawObject* CodePatcher::GetSwitchableCallDataAt(uword return_address,
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const Code& caller_code) {
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// Switchable instance calls only generated for precompilation.
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UNREACHABLE();
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return Object::null();
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}
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void CodePatcher::PatchNativeCallAt(uword return_address,
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const Code& code,
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NativeFunction target,
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const Code& trampoline) {
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UNREACHABLE();
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}
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RawCode* CodePatcher::GetNativeCallAt(uword return_address,
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const Code& code,
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NativeFunction* target) {
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UNREACHABLE();
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return NULL;
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}
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intptr_t CodePatcher::InstanceCallSizeInBytes() {
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return InstanceCall::kPatternSize;
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_IA32
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