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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>
#include "arm/assembler_arm.h"
#include "mips/assembler_mips.h"
#include "x86/assembler_x86.h"
#include "globals.h"
#include "memory_region.h"
namespace art {
static byte* NewContents(size_t capacity) {
return new byte[capacity];
}
AssemblerBuffer::AssemblerBuffer() {
static const size_t kInitialBufferCapacity = 4 * KB;
contents_ = NewContents(kInitialBufferCapacity);
cursor_ = contents_;
limit_ = ComputeLimit(contents_, kInitialBufferCapacity);
fixup_ = NULL;
slow_path_ = NULL;
#ifndef NDEBUG
has_ensured_capacity_ = false;
fixups_processed_ = false;
#endif
// Verify internal state.
CHECK_EQ(Capacity(), kInitialBufferCapacity);
CHECK_EQ(Size(), 0U);
}
AssemblerBuffer::~AssemblerBuffer() {
delete[] contents_;
}
void AssemblerBuffer::ProcessFixups(const MemoryRegion& region) {
AssemblerFixup* fixup = fixup_;
while (fixup != NULL) {
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 old_size = Size();
size_t old_capacity = Capacity();
size_t new_capacity = std::min(old_capacity * 2, old_capacity + 1 * MB);
// Allocate the new data area and copy contents of the old one to it.
byte* new_contents = NewContents(new_capacity);
memmove(reinterpret_cast<void*>(new_contents),
reinterpret_cast<void*>(contents_),
old_size);
// Compute the relocation delta and switch to the new contents area.
ptrdiff_t delta = new_contents - contents_;
contents_ = new_contents;
// Update the cursor and recompute the limit.
cursor_ += delta;
limit_ = ComputeLimit(new_contents, new_capacity);
// Verify internal state.
CHECK_EQ(Capacity(), new_capacity);
CHECK_EQ(Size(), old_size);
}
Assembler* Assembler::Create(InstructionSet instruction_set) {
switch (instruction_set) {
case kArm:
case kThumb2:
return new arm::ArmAssembler();
case kMips:
return new mips::MipsAssembler();
case kX86:
return new x86::X86Assembler();
default:
LOG(FATAL) << "Unknown InstructionSet: " << instruction_set;
return NULL;
}
}
} // namespace art
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