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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.
*/
#include "lazy_debug_frame_opcode_writer.h"
#include "mir_to_lir.h"
namespace art {
namespace dwarf {
const ArenaVector<uint8_t>* LazyDebugFrameOpCodeWriter::Patch(size_t code_size) {
if (!this->enabled_) {
DCHECK(this->data()->empty());
return this->data();
}
if (!patched_) {
patched_ = true;
// Move our data buffer to temporary variable.
ArenaVector<uint8_t> old_opcodes(this->opcodes_.get_allocator());
old_opcodes.swap(this->opcodes_);
// Refill our data buffer with patched opcodes.
this->opcodes_.reserve(old_opcodes.size() + advances_.size() + 4);
size_t pos = 0;
for (auto advance : advances_) {
DCHECK_GE(advance.pos, pos);
// Copy old data up to the point when advance was issued.
this->opcodes_.insert(this->opcodes_.end(),
old_opcodes.begin() + pos,
old_opcodes.begin() + advance.pos);
pos = advance.pos;
// This may be null if there is no slow-path code after return.
LIR* next_lir = NEXT_LIR(advance.last_lir_insn);
// Insert the advance command with its final offset.
Base::AdvancePC(next_lir != nullptr ? next_lir->offset : code_size);
}
// Copy the final segment.
this->opcodes_.insert(this->opcodes_.end(),
old_opcodes.begin() + pos,
old_opcodes.end());
Base::AdvancePC(code_size);
}
return this->data();
}
} // namespace dwarf
} // namespace art
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