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/*
* Copyright (C) 2011 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 "assembler.h"
#include <algorithm>
#include <vector>
#ifdef ART_ENABLE_CODEGEN_arm
#include "arm/assembler_arm32.h"
#include "arm/assembler_thumb2.h"
#endif
#ifdef ART_ENABLE_CODEGEN_arm64
#include "arm64/assembler_arm64.h"
#endif
#ifdef ART_ENABLE_CODEGEN_mips
#include "mips/assembler_mips.h"
#endif
#ifdef ART_ENABLE_CODEGEN_mips64
#include "mips64/assembler_mips64.h"
#endif
#ifdef ART_ENABLE_CODEGEN_x86
#include "x86/assembler_x86.h"
#endif
#ifdef ART_ENABLE_CODEGEN_x86_64
#include "x86_64/assembler_x86_64.h"
#endif
#include "base/casts.h"
#include "globals.h"
#include "memory_region.h"
namespace art {
AssemblerBuffer::AssemblerBuffer(ArenaAllocator* arena)
: arena_(arena) {
static const size_t kInitialBufferCapacity = 4 * KB;
contents_ = arena_->AllocArray<uint8_t>(kInitialBufferCapacity);
cursor_ = contents_;
limit_ = ComputeLimit(contents_, kInitialBufferCapacity);
fixup_ = nullptr;
slow_path_ = nullptr;
#ifndef NDEBUG
has_ensured_capacity_ = false;
fixups_processed_ = false;
#endif
// Verify internal state.
CHECK_EQ(Capacity(), kInitialBufferCapacity);
CHECK_EQ(Size(), 0U);
}
AssemblerBuffer::~AssemblerBuffer() {
if (arena_->IsRunningOnMemoryTool()) {
arena_->MakeInaccessible(contents_, Capacity());
}
}
void AssemblerBuffer::ProcessFixups(const MemoryRegion& region) {
AssemblerFixup* fixup = fixup_;
while (fixup != nullptr) {
fixup->Process(region, fixup->position());
fixup = fixup->previous();
}
}
void AssemblerBuffer::FinalizeInstructions(const MemoryRegion& instructions) {
// Copy the instructions from the buffer.
MemoryRegion from(reinterpret_cast<void*>(contents()), Size());
instructions.CopyFrom(0, from);
// Process fixups in the instructions.
ProcessFixups(instructions);
#ifndef NDEBUG
fixups_processed_ = true;
#endif
}
void AssemblerBuffer::ExtendCapacity(size_t min_capacity) {
size_t old_size = Size();
size_t old_capacity = Capacity();
size_t new_capacity = std::min(old_capacity * 2, old_capacity + 1 * MB);
new_capacity = std::max(new_capacity, min_capacity);
// Allocate the new data area and copy contents of the old one to it.
contents_ = reinterpret_cast<uint8_t*>(
arena_->Realloc(contents_, old_capacity, new_capacity, kArenaAllocAssembler));
// Update the cursor and recompute the limit.
cursor_ = contents_ + old_size;
limit_ = ComputeLimit(contents_, new_capacity);
// Verify internal state.
CHECK_EQ(Capacity(), new_capacity);
CHECK_EQ(Size(), old_size);
}
void DebugFrameOpCodeWriterForAssembler::ImplicitlyAdvancePC() {
uint32_t pc = dchecked_integral_cast<uint32_t>(assembler_->CodeSize());
if (delay_emitting_advance_pc_) {
uint32_t stream_pos = dchecked_integral_cast<uint32_t>(opcodes_.size());
delayed_advance_pcs_.push_back(DelayedAdvancePC {stream_pos, pc});
} else {
AdvancePC(pc);
}
}
std::unique_ptr<Assembler> Assembler::Create(
ArenaAllocator* arena,
InstructionSet instruction_set,
const InstructionSetFeatures* instruction_set_features) {
switch (instruction_set) {
#ifdef ART_ENABLE_CODEGEN_arm
case kArm:
return std::unique_ptr<Assembler>(new (arena) arm::Arm32Assembler(arena));
case kThumb2:
return std::unique_ptr<Assembler>(new (arena) arm::Thumb2Assembler(arena));
#endif
#ifdef ART_ENABLE_CODEGEN_arm64
case kArm64:
return std::unique_ptr<Assembler>(new (arena) arm64::Arm64Assembler(arena));
#endif
#ifdef ART_ENABLE_CODEGEN_mips
case kMips:
return std::unique_ptr<Assembler>(new (arena) mips::MipsAssembler(
arena,
instruction_set_features != nullptr
? instruction_set_features->AsMipsInstructionSetFeatures()
: nullptr));
#endif
#ifdef ART_ENABLE_CODEGEN_mips64
case kMips64:
return std::unique_ptr<Assembler>(new (arena) mips64::Mips64Assembler(arena));
#endif
#ifdef ART_ENABLE_CODEGEN_x86
case kX86:
return std::unique_ptr<Assembler>(new (arena) x86::X86Assembler(arena));
#endif
#ifdef ART_ENABLE_CODEGEN_x86_64
case kX86_64:
return std::unique_ptr<Assembler>(new (arena) x86_64::X86_64Assembler(arena));
#endif
default:
LOG(FATAL) << "Unknown InstructionSet: " << instruction_set;
return nullptr;
}
}
void Assembler::StoreImmediateToThread32(ThreadOffset<4> dest ATTRIBUTE_UNUSED,
uint32_t imm ATTRIBUTE_UNUSED,
ManagedRegister scratch ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::StoreImmediateToThread64(ThreadOffset<8> dest ATTRIBUTE_UNUSED,
uint32_t imm ATTRIBUTE_UNUSED,
ManagedRegister scratch ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::StoreStackOffsetToThread32(ThreadOffset<4> thr_offs ATTRIBUTE_UNUSED,
FrameOffset fr_offs ATTRIBUTE_UNUSED,
ManagedRegister scratch ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::StoreStackOffsetToThread64(ThreadOffset<8> thr_offs ATTRIBUTE_UNUSED,
FrameOffset fr_offs ATTRIBUTE_UNUSED,
ManagedRegister scratch ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::StoreStackPointerToThread32(ThreadOffset<4> thr_offs ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::StoreStackPointerToThread64(ThreadOffset<8> thr_offs ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::LoadFromThread32(ManagedRegister dest ATTRIBUTE_UNUSED,
ThreadOffset<4> src ATTRIBUTE_UNUSED,
size_t size ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::LoadFromThread64(ManagedRegister dest ATTRIBUTE_UNUSED,
ThreadOffset<8> src ATTRIBUTE_UNUSED,
size_t size ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::LoadRawPtrFromThread32(ManagedRegister dest ATTRIBUTE_UNUSED,
ThreadOffset<4> offs ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::LoadRawPtrFromThread64(ManagedRegister dest ATTRIBUTE_UNUSED,
ThreadOffset<8> offs ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::CopyRawPtrFromThread32(FrameOffset fr_offs ATTRIBUTE_UNUSED,
ThreadOffset<4> thr_offs ATTRIBUTE_UNUSED,
ManagedRegister scratch ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::CopyRawPtrFromThread64(FrameOffset fr_offs ATTRIBUTE_UNUSED,
ThreadOffset<8> thr_offs ATTRIBUTE_UNUSED,
ManagedRegister scratch ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::CopyRawPtrToThread32(ThreadOffset<4> thr_offs ATTRIBUTE_UNUSED,
FrameOffset fr_offs ATTRIBUTE_UNUSED,
ManagedRegister scratch ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::CopyRawPtrToThread64(ThreadOffset<8> thr_offs ATTRIBUTE_UNUSED,
FrameOffset fr_offs ATTRIBUTE_UNUSED,
ManagedRegister scratch ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::CallFromThread32(ThreadOffset<4> offset ATTRIBUTE_UNUSED,
ManagedRegister scratch ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
void Assembler::CallFromThread64(ThreadOffset<8> offset ATTRIBUTE_UNUSED,
ManagedRegister scratch ATTRIBUTE_UNUSED) {
UNIMPLEMENTED(FATAL);
}
} // namespace art
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