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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/zucchini/reference_bytes_mixer.h"
#include "base/check_op.h"
#include "base/notreached.h"
#include "components/zucchini/disassembler.h"
namespace zucchini {
/******** ReferenceBytesMixer ********/
// Default implementation is a stub, i.e., for architectures whose references
// have operation bits and payload bits stored in separate bytes. So during
// patch application, payload bits are copied for matched blocks, ignored by
// bytewise corrections, and fixed by reference target corrections.
ReferenceBytesMixer::ReferenceBytesMixer() {}
ReferenceBytesMixer::~ReferenceBytesMixer() = default;
// static.
std::unique_ptr<ReferenceBytesMixer> ReferenceBytesMixer::Create(
const Disassembler& src_dis,
const Disassembler& dst_dis) {
ExecutableType exe_type = src_dis.GetExeType();
DCHECK_EQ(exe_type, dst_dis.GetExeType());
// TODO(huangs): Add ARM handling code when ARM is ready.
return std::make_unique<ReferenceBytesMixer>();
}
// Stub implementation.
int ReferenceBytesMixer::NumBytes(uint8_t type) const {
return 0;
}
// Base class implementation is a stub that should not be called.
ConstBufferView ReferenceBytesMixer::Mix(uint8_t type,
ConstBufferView old_view,
offset_t old_offset,
ConstBufferView new_view,
offset_t new_offset) {
NOTREACHED() << "Stub.";
return ConstBufferView();
}
} // namespace zucchini
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