142 lines
5.0 KiB
C++
142 lines
5.0 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_LIBDEXFILE_DEX_STANDARD_DEX_FILE_H_
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#define ART_LIBDEXFILE_DEX_STANDARD_DEX_FILE_H_
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#include <iosfwd>
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#include "dex_file.h"
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namespace art {
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class OatDexFile;
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// Standard dex file. This is the format that is packaged in APKs and produced by tools.
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class StandardDexFile : public DexFile {
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public:
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class Header : public DexFile::Header {
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// Same for now.
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};
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struct CodeItem : public dex::CodeItem {
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static constexpr size_t kAlignment = 4;
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static constexpr size_t InsSizeOffset() {
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return OFFSETOF_MEMBER(CodeItem, ins_size_);
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}
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static constexpr size_t OutsSizeOffset() {
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return OFFSETOF_MEMBER(CodeItem, outs_size_);
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}
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static constexpr size_t RegistersSizeOffset() {
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return OFFSETOF_MEMBER(CodeItem, registers_size_);
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}
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static constexpr size_t InsnsOffset() {
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return OFFSETOF_MEMBER(CodeItem, insns_);
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}
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private:
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CodeItem() = default;
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uint16_t registers_size_; // the number of registers used by this code
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// (locals + parameters)
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uint16_t ins_size_; // the number of words of incoming arguments to the method
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// that this code is for
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uint16_t outs_size_; // the number of words of outgoing argument space required
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// by this code for method invocation
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uint16_t tries_size_; // the number of try_items for this instance. If non-zero,
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// then these appear as the tries array just after the
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// insns in this instance.
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uint32_t debug_info_off_; // Holds file offset to debug info stream.
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uint32_t insns_size_in_code_units_; // size of the insns array, in 2 byte code units
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uint16_t insns_[1]; // actual array of bytecode.
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ART_FRIEND_TEST(CodeItemAccessorsTest, TestDexInstructionsAccessor);
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friend class CodeItemDataAccessor;
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friend class CodeItemDebugInfoAccessor;
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friend class CodeItemInstructionAccessor;
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friend class DexWriter;
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friend class StandardDexFile;
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DISALLOW_COPY_AND_ASSIGN(CodeItem);
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};
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// Write the standard dex specific magic.
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static void WriteMagic(uint8_t* magic);
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// Write the current version, note that the input is the address of the magic.
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static void WriteCurrentVersion(uint8_t* magic);
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// Write the last version before default method support,
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// note that the input is the address of the magic.
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static void WriteVersionBeforeDefaultMethods(uint8_t* magic);
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static const uint8_t kDexMagic[kDexMagicSize];
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static constexpr size_t kNumDexVersions = 5;
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static const uint8_t kDexMagicVersions[kNumDexVersions][kDexVersionLen];
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// Returns true if the byte string points to the magic value.
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static bool IsMagicValid(const uint8_t* magic);
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bool IsMagicValid() const override;
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// Returns true if the byte string after the magic is the correct value.
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static bool IsVersionValid(const uint8_t* magic);
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bool IsVersionValid() const override;
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bool SupportsDefaultMethods() const override;
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uint32_t GetCodeItemSize(const dex::CodeItem& item) const override;
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size_t GetDequickenedSize() const override {
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// JVMTI will run dex layout on standard dex files that have hidden API data,
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// in order to remove that data. As dexlayout may increase the size of the dex file,
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// be (very) conservative and add one MB to the size.
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return Size() + (HasHiddenapiClassData() ? 1 * MB : 0);
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}
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private:
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StandardDexFile(const uint8_t* base,
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size_t size,
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const std::string& location,
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uint32_t location_checksum,
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const OatDexFile* oat_dex_file,
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std::unique_ptr<DexFileContainer> container)
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: DexFile(base,
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size,
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/*data_begin*/ base,
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/*data_size*/ size,
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location,
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location_checksum,
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oat_dex_file,
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std::move(container),
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/*is_compact_dex*/ false) {}
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friend class DexFileLoader;
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friend class DexFileVerifierTest;
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ART_FRIEND_TEST(ClassLinkerTest, RegisterDexFileName); // for constructor
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friend class OptimizingUnitTestHelper; // for constructor
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DISALLOW_COPY_AND_ASSIGN(StandardDexFile);
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};
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} // namespace art
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#endif // ART_LIBDEXFILE_DEX_STANDARD_DEX_FILE_H_
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