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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "code_generator_x86.h"
#include "utils/assembler.h"
#include "utils/x86/assembler_x86.h"
#include "mirror/array.h"
#include "mirror/art_method.h"
#define __ reinterpret_cast<X86Assembler*>(GetAssembler())->
namespace art {
namespace x86 {
void CodeGeneratorX86::GenerateFrameEntry() {
// Create a fake register to mimic Quick.
static const int kFakeReturnRegister = 8;
core_spill_mask_ |= (1 << kFakeReturnRegister);
// We're currently always using EBP, which is callee-saved in Quick.
core_spill_mask_ |= (1 << EBP);
__ pushl(EBP);
__ movl(EBP, ESP);
// Add the current ART method to the frame size, the return pc, and EBP.
SetFrameSize(RoundUp(GetFrameSize() + 3 * kWordSize, kStackAlignment));
// The PC and EBP have already been pushed on the stack.
__ subl(ESP, Immediate(GetFrameSize() - 2 * kWordSize));
__ movl(Address(ESP, 0), EAX);
}
void CodeGeneratorX86::GenerateFrameExit() {
__ movl(ESP, EBP);
__ popl(EBP);
}
void CodeGeneratorX86::Bind(Label* label) {
__ Bind(label);
}
void CodeGeneratorX86::Push(HInstruction* instruction, Location location) {
__ pushl(location.reg<Register>());
}
void InstructionCodeGeneratorX86::LoadCurrentMethod(Register reg) {
__ movl(reg, Address(ESP, 0));
}
void CodeGeneratorX86::Move(HInstruction* instruction, Location location) {
HIntConstant* constant = instruction->AsIntConstant();
if (constant != nullptr) {
__ movl(location.reg<Register>(), Immediate(constant->GetValue()));
} else {
__ popl(location.reg<Register>());
}
}
void LocationsBuilderX86::VisitGoto(HGoto* got) {
got->SetLocations(nullptr);
}
void InstructionCodeGeneratorX86::VisitGoto(HGoto* got) {
HBasicBlock* successor = got->GetSuccessor();
if (GetGraph()->GetExitBlock() == successor) {
codegen_->GenerateFrameExit();
} else if (!codegen_->GoesToNextBlock(got->GetBlock(), successor)) {
__ jmp(codegen_->GetLabelOf(successor));
}
}
void LocationsBuilderX86::VisitExit(HExit* exit) {
exit->SetLocations(nullptr);
}
void InstructionCodeGeneratorX86::VisitExit(HExit* exit) {
if (kIsDebugBuild) {
__ Comment("Unreachable");
__ int3();
}
}
void LocationsBuilderX86::VisitIf(HIf* if_instr) {
LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(if_instr);
locations->SetInAt(0, Location(EAX));
if_instr->SetLocations(locations);
}
void InstructionCodeGeneratorX86::VisitIf(HIf* if_instr) {
// TODO: Generate the input as a condition, instead of materializing in a register.
__ cmpl(if_instr->GetLocations()->InAt(0).reg<Register>(), Immediate(0));
__ j(kEqual, codegen_->GetLabelOf(if_instr->IfFalseSuccessor()));
if (!codegen_->GoesToNextBlock(if_instr->GetBlock(), if_instr->IfTrueSuccessor())) {
__ jmp(codegen_->GetLabelOf(if_instr->IfTrueSuccessor()));
}
}
void LocationsBuilderX86::VisitLocal(HLocal* local) {
local->SetLocations(nullptr);
}
void InstructionCodeGeneratorX86::VisitLocal(HLocal* local) {
DCHECK_EQ(local->GetBlock(), GetGraph()->GetEntryBlock());
codegen_->SetFrameSize(codegen_->GetFrameSize() + kWordSize);
}
void LocationsBuilderX86::VisitLoadLocal(HLoadLocal* local) {
LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(local);
locations->SetOut(Location(EAX));
local->SetLocations(locations);
}
static int32_t GetStackSlot(HLocal* local) {
// We are currently using EBP to access locals, so the offset must be negative.
// +1 for going backwards, +1 for the method pointer.
return (local->GetRegNumber() + 2) * -kWordSize;
}
void InstructionCodeGeneratorX86::VisitLoadLocal(HLoadLocal* load) {
__ movl(load->GetLocations()->Out().reg<Register>(),
Address(EBP, GetStackSlot(load->GetLocal())));
}
void LocationsBuilderX86::VisitStoreLocal(HStoreLocal* local) {
LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(local);
locations->SetInAt(1, Location(EAX));
local->SetLocations(locations);
}
void InstructionCodeGeneratorX86::VisitStoreLocal(HStoreLocal* store) {
__ movl(Address(EBP, GetStackSlot(store->GetLocal())),
store->GetLocations()->InAt(1).reg<Register>());
}
void LocationsBuilderX86::VisitEqual(HEqual* equal) {
LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(equal);
locations->SetInAt(0, Location(EAX));
locations->SetInAt(1, Location(ECX));
locations->SetOut(Location(EAX));
equal->SetLocations(locations);
}
void InstructionCodeGeneratorX86::VisitEqual(HEqual* equal) {
__ cmpl(equal->GetLocations()->InAt(0).reg<Register>(),
equal->GetLocations()->InAt(1).reg<Register>());
__ setb(kEqual, equal->GetLocations()->Out().reg<Register>());
}
void LocationsBuilderX86::VisitIntConstant(HIntConstant* constant) {
constant->SetLocations(nullptr);
}
void InstructionCodeGeneratorX86::VisitIntConstant(HIntConstant* constant) {
// Will be generated at use site.
}
void LocationsBuilderX86::VisitReturnVoid(HReturnVoid* ret) {
ret->SetLocations(nullptr);
}
void InstructionCodeGeneratorX86::VisitReturnVoid(HReturnVoid* ret) {
codegen_->GenerateFrameExit();
__ ret();
}
void LocationsBuilderX86::VisitReturn(HReturn* ret) {
LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(ret);
locations->SetInAt(0, Location(EAX));
ret->SetLocations(locations);
}
void InstructionCodeGeneratorX86::VisitReturn(HReturn* ret) {
DCHECK_EQ(ret->GetLocations()->InAt(0).reg<Register>(), EAX);
codegen_->GenerateFrameExit();
__ ret();
}
void LocationsBuilderX86::VisitInvokeStatic(HInvokeStatic* invoke) {
LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(invoke);
CHECK_EQ(invoke->InputCount(), 0);
locations->AddTemp(Location(EAX));
invoke->SetLocations(locations);
}
void InstructionCodeGeneratorX86::VisitInvokeStatic(HInvokeStatic* invoke) {
Register temp = invoke->GetLocations()->GetTemp(0).reg<Register>();
size_t index_in_cache = mirror::Array::DataOffset(sizeof(mirror::Object*)).Int32Value() +
invoke->GetIndexInDexCache() * kWordSize;
// TODO: Implement all kinds of calls:
// 1) boot -> boot
// 2) app -> boot
// 3) app -> app
//
// Currently we implement the app -> app logic, which looks up in the resolve cache.
// temp = method;
LoadCurrentMethod(temp);
// temp = temp->dex_cache_resolved_methods_;
__ movl(temp, Address(temp, mirror::ArtMethod::DexCacheResolvedMethodsOffset().Int32Value()));
// temp = temp[index_in_cache]
__ movl(temp, Address(temp, index_in_cache));
// (temp + offset_of_quick_compiled_code)()
__ call(Address(temp, mirror::ArtMethod::EntryPointFromQuickCompiledCodeOffset().Int32Value()));
codegen_->RecordPcInfo(invoke->GetDexPc());
}
} // namespace x86
} // namespace art
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