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/*
* Copyright (C) 2015 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.
*/
#ifndef ART_COMPILER_DEX_QUICK_LAZY_DEBUG_FRAME_OPCODE_WRITER_H_
#define ART_COMPILER_DEX_QUICK_LAZY_DEBUG_FRAME_OPCODE_WRITER_H_
#include "base/arena_allocator.h"
#include "base/arena_containers.h"
#include "dwarf/debug_frame_opcode_writer.h"
namespace art {
struct LIR;
namespace dwarf {
// When we are generating the CFI code, we do not know the instuction offsets,
// this class stores the LIR references and patches the instruction stream later.
class LazyDebugFrameOpCodeWriter FINAL
: public DebugFrameOpCodeWriter<ArenaAllocatorAdapter<uint8_t>> {
typedef DebugFrameOpCodeWriter<ArenaAllocatorAdapter<uint8_t>> Base;
public:
// This method is implicitely called the by opcode writers.
virtual void ImplicitlyAdvancePC() OVERRIDE {
DCHECK_EQ(patched_, false);
DCHECK_EQ(this->current_pc_, 0);
advances_.push_back({this->data()->size(), *last_lir_insn_});
}
const ArenaVector<uint8_t>* Patch(size_t code_size);
explicit LazyDebugFrameOpCodeWriter(LIR** last_lir_insn, bool enable_writes,
ArenaAllocator* allocator)
: Base(enable_writes, allocator->Adapter()),
last_lir_insn_(last_lir_insn),
advances_(allocator->Adapter()),
patched_(false) {
}
private:
typedef struct {
size_t pos;
LIR* last_lir_insn;
} Advance;
using Base::data; // Hidden. Use Patch method instead.
LIR** last_lir_insn_;
ArenaVector<Advance> advances_;
bool patched_;
DISALLOW_COPY_AND_ASSIGN(LazyDebugFrameOpCodeWriter);
};
} // namespace dwarf
} // namespace art
#endif // ART_COMPILER_DEX_QUICK_LAZY_DEBUG_FRAME_OPCODE_WRITER_H_
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