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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.
#ifndef COMPONENTS_ZUCCHINI_DISASSEMBLER_DEX_H_
#define COMPONENTS_ZUCCHINI_DISASSEMBLER_DEX_H_
#include <stdint.h>
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "base/macros.h"
#include "components/zucchini/disassembler.h"
#include "components/zucchini/image_utils.h"
#include "components/zucchini/type_dex.h"
namespace zucchini {
// For consistency, let "canonical order" of DEX data types be the order defined
// in https://source.android.com/devices/tech/dalvik/dex-format "Type Codes"
// section.
class DisassemblerDex : public Disassembler {
public:
// Pools follow canonical order.
enum ReferencePool : uint8_t {
kStringId,
kTypeId,
kProtoId,
kFieldId,
kMethodId,
kClassDef,
kTypeList,
kCode,
kStringData,
kNumPools
};
// Types are grouped and ordered by target ReferencePool. This is required by
// Zucchini-apply, which visits references by type order and sequentially
// handles pools in the same order. Type-pool association is established in
// MakeReferenceGroups(), and verified by a unit test.
enum ReferenceType : uint8_t {
kFieldIdToNameStringId, // kStringId
kCodeToStringId16,
kCodeToStringId32,
kFieldIdToClassTypeId, // kTypeId
kFieldIdToTypeId,
kCodeToTypeId,
kCodeToFieldId, // kFieldId
kCodeToMethodId, // kMethodId
kCodeToRelCode16, // kCode
kCodeToRelCode32,
kStringIdToStringData, // kStringData
// TODO(ckitagawa): Extract the following kinds of pointers.
// kProtoToShortyStringId,
// kProtoToReturnTypeId,
// kProtoToParamsTypeList,
// kMethodToClassTypeId,
// kMethodToProtoId,
// kMethodToNameStringId,
// kTypeListToTypeId,
// kClassDefToClassTypeId,
// kClassDefToSuperclassTypeId,
// kClassDefToInterfaceTypeList,
kNumTypes
};
DisassemblerDex();
~DisassemblerDex() override;
// Applies quick checks to determine if |image| *may* point to the start of an
// executable. Returns true on success.
static bool QuickDetect(ConstBufferView image);
// Disassembler:
ExecutableType GetExeType() const override;
std::string GetExeTypeString() const override;
std::vector<ReferenceGroup> MakeReferenceGroups() const override;
// Functions that return reference readers. These follow canonical order of
// *locations* (unlike targets for ReferenceType). This allows functions with
// similar parsing logic to appear togeter.
std::unique_ptr<ReferenceReader> MakeReadStringIdToStringData(offset_t lo,
offset_t hi);
std::unique_ptr<ReferenceReader> MakeReadFieldToClassTypeId16(offset_t lo,
offset_t hi);
std::unique_ptr<ReferenceReader> MakeReadFieldToTypeId16(offset_t lo,
offset_t hi);
std::unique_ptr<ReferenceReader> MakeReadFieldToNameStringId32(offset_t lo,
offset_t hi);
std::unique_ptr<ReferenceReader> MakeReadCodeToStringId16(offset_t lo,
offset_t hi);
std::unique_ptr<ReferenceReader> MakeReadCodeToStringId32(offset_t lo,
offset_t hi);
std::unique_ptr<ReferenceReader> MakeReadCodeToTypeId16(offset_t lo,
offset_t hi);
std::unique_ptr<ReferenceReader> MakeReadCodeToFieldId16(offset_t lo,
offset_t hi);
std::unique_ptr<ReferenceReader> MakeReadCodeToMethodId16(offset_t lo,
offset_t hi);
std::unique_ptr<ReferenceReader> MakeReadCodeToRelCode16(offset_t lo,
offset_t hi);
std::unique_ptr<ReferenceReader> MakeReadCodeToRelCode32(offset_t lo,
offset_t hi);
// Functions that return reference writers. Different readers may share a
// common writer. Therefore these loosely follow canonical order of locations,
std::unique_ptr<ReferenceWriter> MakeWriteStringId16(MutableBufferView image);
std::unique_ptr<ReferenceWriter> MakeWriteStringId32(MutableBufferView image);
std::unique_ptr<ReferenceWriter> MakeWriteTypeId16(MutableBufferView image);
std::unique_ptr<ReferenceWriter> MakeWriteFieldId16(MutableBufferView image);
std::unique_ptr<ReferenceWriter> MakeWriteMethodId16(MutableBufferView image);
std::unique_ptr<ReferenceWriter> MakeWriteRelCode16(MutableBufferView image);
std::unique_ptr<ReferenceWriter> MakeWriteRelCode32(MutableBufferView image);
std::unique_ptr<ReferenceWriter> MakeWriteAbs32(MutableBufferView image);
private:
friend Disassembler;
using MapItemMap = std::map<uint16_t, const dex::MapItem*>;
// Disassembler:
bool Parse(ConstBufferView image) override;
bool ParseHeader();
const dex::HeaderItem* header_ = nullptr;
int dex_version_ = 0;
MapItemMap map_item_map_ = {};
dex::MapItem string_map_item_ = {};
dex::MapItem type_map_item_ = {};
dex::MapItem field_map_item_ = {};
dex::MapItem method_map_item_ = {};
dex::MapItem code_map_item_ = {};
// Sorted list of offsets of code items in |image_|.
std::vector<offset_t> code_item_offsets_;
DISALLOW_COPY_AND_ASSIGN(DisassemblerDex);
};
} // namespace zucchini
#endif // COMPONENTS_ZUCCHINI_DISASSEMBLER_DEX_H_
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