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4201900778
Addtional cleanup in code_patcher on all platforms. R=zra@google.com Review URL: https://codereview.chromium.org//829133006 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@42700 260f80e4-7a28-3924-810f-c04153c831b5
260 lines
7.1 KiB
C++
260 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/assembler.h"
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#include "vm/code_patcher.h"
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#include "vm/cpu.h"
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#include "vm/dart_entry.h"
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#include "vm/flow_graph_compiler.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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// 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 - (kNumInstructions * kInstructionSize)) {
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ASSERT(IsValid(return_address));
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ASSERT(kInstructionSize == Assembler::kCallExternalLabelSize);
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}
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static bool IsValid(uword return_address) {
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uint8_t* code_bytes =
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reinterpret_cast<uint8_t*>(
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return_address - (kNumInstructions * kInstructionSize));
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return (code_bytes[0] == 0xB9) &&
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(code_bytes[1 * kInstructionSize] == 0xE8);
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}
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uword target() const {
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const uword offset = *reinterpret_cast<uword*>(call_address() + 1);
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return return_address() + offset;
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}
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void set_target(uword target) const {
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uword* target_addr = reinterpret_cast<uword*>(call_address() + 1);
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uword offset = target - return_address();
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*target_addr = offset;
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CPU::FlushICache(call_address(), kInstructionSize);
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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 kNumInstructions = 2;
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static const int kInstructionSize = 5; // All instructions have same length.
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private:
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uword return_address() const {
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return start_ + kNumInstructions * kInstructionSize;
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}
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uword call_address() const {
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return start_ + 1 * kInstructionSize;
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}
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uword start_;
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DISALLOW_IMPLICIT_CONSTRUCTORS(UnoptimizedCall);
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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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// call target_address
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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 - (kNumInstructions * kInstructionSize)) {
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ASSERT(IsValid(return_address));
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ASSERT(kInstructionSize == Assembler::kCallExternalLabelSize);
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}
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static bool IsValid(uword return_address) {
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uint8_t* code_bytes =
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reinterpret_cast<uint8_t*>(
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return_address - (kNumInstructions * kInstructionSize));
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return (code_bytes[0] == 0xE8);
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}
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uword target() const {
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const uword offset = *reinterpret_cast<uword*>(call_address() + 1);
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return return_address() + offset;
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}
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void set_target(uword target) const {
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uword* target_addr = reinterpret_cast<uword*>(call_address() + 1);
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uword offset = target - return_address();
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*target_addr = offset;
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CPU::FlushICache(call_address(), kInstructionSize);
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}
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static const int kNumInstructions = 1;
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static const int kInstructionSize = 5; // All instructions have same length.
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private:
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uword return_address() const {
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return start_ + kNumInstructions * kInstructionSize;
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}
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uword call_address() const {
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return start_;
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}
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uword start_;
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DISALLOW_IMPLICIT_CONSTRUCTORS(StaticCall);
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};
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uword 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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uword new_target) {
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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::PatchInstanceCallAt(uword return_address,
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const Code& code,
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uword new_target) {
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ASSERT(code.ContainsInstructionAt(return_address));
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InstanceCall call(return_address);
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call.set_target(new_target);
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}
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int32_t CodePatcher::GetPoolOffsetAt(uword return_address) {
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UNREACHABLE();
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return 0;
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}
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void CodePatcher::SetPoolOffsetAt(uword return_address, int32_t offset) {
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UNREACHABLE();
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}
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void CodePatcher::InsertCallAt(uword start, uword target) {
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// The inserted call should not overlap the lazy deopt jump code.
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ASSERT(start + CallPattern::InstructionLength() <= target);
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*reinterpret_cast<uint8_t*>(start) = 0xE8;
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CallPattern call(start);
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call.SetTargetAddress(target);
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CPU::FlushICache(start, CallPattern::InstructionLength());
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}
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uword CodePatcher::GetInstanceCallAt(
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uword return_address, const Code& code, 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 call.target();
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}
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RawFunction* CodePatcher::GetUnoptimizedStaticCallAt(
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uword return_address, const Code& code, 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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intptr_t CodePatcher::InstanceCallSizeInBytes() {
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return InstanceCall::kNumInstructions * InstanceCall::kInstructionSize;
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}
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// The expected code pattern of an edge counter in unoptimized code:
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// b8 imm32 mov EAX, immediate
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class EdgeCounter : public ValueObject {
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public:
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EdgeCounter(uword pc, const Code& ignored)
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: end_(pc - FlowGraphCompiler::EdgeCounterIncrementSizeInBytes()) {
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ASSERT(IsValid(end_));
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}
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static bool IsValid(uword end) {
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return (*reinterpret_cast<uint8_t*>(end - 5) == 0xb8);
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}
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RawObject* edge_counter() const {
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return *reinterpret_cast<RawObject**>(end_ - 4);
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}
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private:
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uword end_;
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};
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RawObject* CodePatcher::GetEdgeCounterAt(uword pc, const Code& code) {
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ASSERT(code.ContainsInstructionAt(pc));
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EdgeCounter counter(pc, code);
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return counter.edge_counter();
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_IA32
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