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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_LIBDEXFILE_DEX_TEST_DEX_FILE_BUILDER_H_
#define ART_LIBDEXFILE_DEX_TEST_DEX_FILE_BUILDER_H_
#include <zlib.h>
#include <cstring>
#include <map>
#include <set>
#include <vector>
#include <android-base/logging.h>
#include "base/bit_utils.h"
#include "dex/dex_file_loader.h"
#include "dex/standard_dex_file.h"
namespace art {
class TestDexFileBuilder {
public:
TestDexFileBuilder()
: strings_(), types_(), fields_(), protos_(), dex_file_data_() {
}
void AddString(const std::string& str) {
CHECK(dex_file_data_.empty());
auto it = strings_.emplace(str, IdxAndDataOffset()).first;
CHECK_LT(it->first.length(), 128u); // Don't allow multi-byte length in uleb128.
}
void AddType(const std::string& descriptor) {
CHECK(dex_file_data_.empty());
AddString(descriptor);
types_.emplace(descriptor, 0u);
}
void AddField(const std::string& class_descriptor, const std::string& type,
const std::string& name) {
CHECK(dex_file_data_.empty());
AddType(class_descriptor);
AddType(type);
AddString(name);
FieldKey key = { class_descriptor, type, name };
fields_.emplace(key, 0u);
}
void AddMethod(const std::string& class_descriptor, const std::string& signature,
const std::string& name) {
CHECK(dex_file_data_.empty());
AddType(class_descriptor);
AddString(name);
ProtoKey proto_key = CreateProtoKey(signature);
AddString(proto_key.shorty);
AddType(proto_key.return_type);
for (const auto& arg_type : proto_key.args) {
AddType(arg_type);
}
auto it = protos_.emplace(proto_key, IdxAndDataOffset()).first;
const ProtoKey* proto = &it->first; // Valid as long as the element remains in protos_.
MethodKey method_key = {
class_descriptor, name, proto
};
methods_.emplace(method_key, 0u);
}
// NOTE: The builder holds the actual data, so it must live as long as the dex file.
std::unique_ptr<const DexFile> Build(const std::string& dex_location) {
CHECK(dex_file_data_.empty());
union {
uint8_t data[sizeof(DexFile::Header)];
uint64_t force_alignment;
} header_data;
std::memset(header_data.data, 0, sizeof(header_data.data));
DexFile::Header* header = reinterpret_cast<DexFile::Header*>(&header_data.data);
std::copy_n(StandardDexFile::kDexMagic, 4u, header->magic_);
std::copy_n(StandardDexFile::kDexMagicVersions[0], 4u, header->magic_ + 4u);
header->header_size_ = sizeof(DexFile::Header);
header->endian_tag_ = DexFile::kDexEndianConstant;
header->link_size_ = 0u; // Unused.
header->link_off_ = 0u; // Unused.
header->map_off_ = 0u; // Unused. TODO: This is wrong. Dex files created by this builder
// cannot be verified. b/26808512
uint32_t data_section_size = 0u;
uint32_t string_ids_offset = sizeof(DexFile::Header);
uint32_t string_idx = 0u;
for (auto& entry : strings_) {
entry.second.idx = string_idx;
string_idx += 1u;
entry.second.data_offset = data_section_size;
data_section_size += entry.first.length() + 1u /* length */ + 1u /* null-terminator */;
}
header->string_ids_size_ = strings_.size();
header->string_ids_off_ = strings_.empty() ? 0u : string_ids_offset;
uint32_t type_ids_offset = string_ids_offset + strings_.size() * sizeof(dex::StringId);
uint32_t type_idx = 0u;
for (auto& entry : types_) {
entry.second = type_idx;
type_idx += 1u;
}
header->type_ids_size_ = types_.size();
header->type_ids_off_ = types_.empty() ? 0u : type_ids_offset;
uint32_t proto_ids_offset = type_ids_offset + types_.size() * sizeof(dex::TypeId);
uint32_t proto_idx = 0u;
for (auto& entry : protos_) {
entry.second.idx = proto_idx;
proto_idx += 1u;
size_t num_args = entry.first.args.size();
if (num_args != 0u) {
entry.second.data_offset = RoundUp(data_section_size, 4u);
data_section_size = entry.second.data_offset + 4u + num_args * sizeof(dex::TypeItem);
} else {
entry.second.data_offset = 0u;
}
}
header->proto_ids_size_ = protos_.size();
header->proto_ids_off_ = protos_.empty() ? 0u : proto_ids_offset;
uint32_t field_ids_offset = proto_ids_offset + protos_.size() * sizeof(dex::ProtoId);
uint32_t field_idx = 0u;
for (auto& entry : fields_) {
entry.second = field_idx;
field_idx += 1u;
}
header->field_ids_size_ = fields_.size();
header->field_ids_off_ = fields_.empty() ? 0u : field_ids_offset;
uint32_t method_ids_offset = field_ids_offset + fields_.size() * sizeof(dex::FieldId);
uint32_t method_idx = 0u;
for (auto& entry : methods_) {
entry.second = method_idx;
method_idx += 1u;
}
header->method_ids_size_ = methods_.size();
header->method_ids_off_ = methods_.empty() ? 0u : method_ids_offset;
// No class defs.
header->class_defs_size_ = 0u;
header->class_defs_off_ = 0u;
uint32_t data_section_offset = method_ids_offset + methods_.size() * sizeof(dex::MethodId);
header->data_size_ = data_section_size;
header->data_off_ = (data_section_size != 0u) ? data_section_offset : 0u;
uint32_t total_size = data_section_offset + data_section_size;
dex_file_data_.resize(total_size);
for (const auto& entry : strings_) {
CHECK_LT(entry.first.size(), 128u);
uint32_t raw_offset = data_section_offset + entry.second.data_offset;
dex_file_data_[raw_offset] = static_cast<uint8_t>(entry.first.size());
std::memcpy(&dex_file_data_[raw_offset + 1], entry.first.c_str(), entry.first.size() + 1);
Write32(string_ids_offset + entry.second.idx * sizeof(dex::StringId), raw_offset);
}
for (const auto& entry : types_) {
Write32(type_ids_offset + entry.second * sizeof(dex::TypeId), GetStringIdx(entry.first));
++type_idx;
}
for (const auto& entry : protos_) {
size_t num_args = entry.first.args.size();
uint32_t type_list_offset =
(num_args != 0u) ? data_section_offset + entry.second.data_offset : 0u;
uint32_t raw_offset = proto_ids_offset + entry.second.idx * sizeof(dex::ProtoId);
Write32(raw_offset + 0u, GetStringIdx(entry.first.shorty));
Write16(raw_offset + 4u, GetTypeIdx(entry.first.return_type));
Write32(raw_offset + 8u, type_list_offset);
if (num_args != 0u) {
CHECK_NE(entry.second.data_offset, 0u);
Write32(type_list_offset, num_args);
for (size_t i = 0; i != num_args; ++i) {
Write16(type_list_offset + 4u + i * sizeof(dex::TypeItem),
GetTypeIdx(entry.first.args[i]));
}
}
}
for (const auto& entry : fields_) {
uint32_t raw_offset = field_ids_offset + entry.second * sizeof(dex::FieldId);
Write16(raw_offset + 0u, GetTypeIdx(entry.first.class_descriptor));
Write16(raw_offset + 2u, GetTypeIdx(entry.first.type));
Write32(raw_offset + 4u, GetStringIdx(entry.first.name));
}
for (const auto& entry : methods_) {
uint32_t raw_offset = method_ids_offset + entry.second * sizeof(dex::MethodId);
Write16(raw_offset + 0u, GetTypeIdx(entry.first.class_descriptor));
auto it = protos_.find(*entry.first.proto);
CHECK(it != protos_.end());
Write16(raw_offset + 2u, it->second.idx);
Write32(raw_offset + 4u, GetStringIdx(entry.first.name));
}
// Leave signature as zeros.
header->file_size_ = dex_file_data_.size();
// Write the complete header early, as part of it needs to be checksummed.
std::memcpy(&dex_file_data_[0], header_data.data, sizeof(DexFile::Header));
// Checksum starts after the checksum field.
size_t skip = sizeof(header->magic_) + sizeof(header->checksum_);
header->checksum_ = adler32(adler32(0L, Z_NULL, 0),
dex_file_data_.data() + skip,
dex_file_data_.size() - skip);
// Write the complete header again, just simpler that way.
std::memcpy(&dex_file_data_[0], header_data.data, sizeof(DexFile::Header));
static constexpr bool kVerify = false;
static constexpr bool kVerifyChecksum = false;
std::string error_msg;
const DexFileLoader dex_file_loader;
std::unique_ptr<const DexFile> dex_file(dex_file_loader.Open(
&dex_file_data_[0],
dex_file_data_.size(),
dex_location,
0u,
nullptr,
kVerify,
kVerifyChecksum,
&error_msg));
CHECK(dex_file != nullptr) << error_msg;
return dex_file;
}
uint32_t GetStringIdx(const std::string& type) {
auto it = strings_.find(type);
CHECK(it != strings_.end());
return it->second.idx;
}
uint32_t GetTypeIdx(const std::string& type) {
auto it = types_.find(type);
CHECK(it != types_.end());
return it->second;
}
uint32_t GetFieldIdx(const std::string& class_descriptor, const std::string& type,
const std::string& name) {
FieldKey key = { class_descriptor, type, name };
auto it = fields_.find(key);
CHECK(it != fields_.end());
return it->second;
}
uint32_t GetMethodIdx(const std::string& class_descriptor, const std::string& signature,
const std::string& name) {
ProtoKey proto_key = CreateProtoKey(signature);
MethodKey method_key = { class_descriptor, name, &proto_key };
auto it = methods_.find(method_key);
CHECK(it != methods_.end());
return it->second;
}
private:
struct IdxAndDataOffset {
uint32_t idx;
uint32_t data_offset;
};
struct FieldKey {
const std::string class_descriptor;
const std::string type;
const std::string name;
};
struct FieldKeyComparator {
bool operator()(const FieldKey& lhs, const FieldKey& rhs) const {
if (lhs.class_descriptor != rhs.class_descriptor) {
return lhs.class_descriptor < rhs.class_descriptor;
}
if (lhs.name != rhs.name) {
return lhs.name < rhs.name;
}
return lhs.type < rhs.type;
}
};
struct ProtoKey {
std::string shorty;
std::string return_type;
std::vector<std::string> args;
};
struct ProtoKeyComparator {
bool operator()(const ProtoKey& lhs, const ProtoKey& rhs) const {
if (lhs.return_type != rhs.return_type) {
return lhs.return_type < rhs.return_type;
}
size_t min_args = std::min(lhs.args.size(), rhs.args.size());
for (size_t i = 0; i != min_args; ++i) {
if (lhs.args[i] != rhs.args[i]) {
return lhs.args[i] < rhs.args[i];
}
}
return lhs.args.size() < rhs.args.size();
}
};
struct MethodKey {
std::string class_descriptor;
std::string name;
const ProtoKey* proto;
};
struct MethodKeyComparator {
bool operator()(const MethodKey& lhs, const MethodKey& rhs) const {
if (lhs.class_descriptor != rhs.class_descriptor) {
return lhs.class_descriptor < rhs.class_descriptor;
}
if (lhs.name != rhs.name) {
return lhs.name < rhs.name;
}
return ProtoKeyComparator()(*lhs.proto, *rhs.proto);
}
};
ProtoKey CreateProtoKey(const std::string& signature) {
CHECK_EQ(signature[0], '(');
const char* args = signature.c_str() + 1;
const char* args_end = std::strchr(args, ')');
CHECK(args_end != nullptr);
const char* return_type = args_end + 1;
ProtoKey key = {
std::string() + ((*return_type == '[') ? 'L' : *return_type),
return_type,
std::vector<std::string>()
};
while (args != args_end) {
key.shorty += (*args == '[') ? 'L' : *args;
const char* arg_start = args;
while (*args == '[') {
++args;
}
if (*args == 'L') {
do {
++args;
CHECK_NE(args, args_end);
} while (*args != ';');
}
++args;
key.args.emplace_back(arg_start, args);
}
return key;
}
void Write32(size_t offset, uint32_t value) {
CHECK_LE(offset + 4u, dex_file_data_.size());
CHECK_EQ(dex_file_data_[offset + 0], 0u);
CHECK_EQ(dex_file_data_[offset + 1], 0u);
CHECK_EQ(dex_file_data_[offset + 2], 0u);
CHECK_EQ(dex_file_data_[offset + 3], 0u);
dex_file_data_[offset + 0] = static_cast<uint8_t>(value >> 0);
dex_file_data_[offset + 1] = static_cast<uint8_t>(value >> 8);
dex_file_data_[offset + 2] = static_cast<uint8_t>(value >> 16);
dex_file_data_[offset + 3] = static_cast<uint8_t>(value >> 24);
}
void Write16(size_t offset, uint32_t value) {
CHECK_LE(value, 0xffffu);
CHECK_LE(offset + 2u, dex_file_data_.size());
CHECK_EQ(dex_file_data_[offset + 0], 0u);
CHECK_EQ(dex_file_data_[offset + 1], 0u);
dex_file_data_[offset + 0] = static_cast<uint8_t>(value >> 0);
dex_file_data_[offset + 1] = static_cast<uint8_t>(value >> 8);
}
std::map<std::string, IdxAndDataOffset> strings_;
std::map<std::string, uint32_t> types_;
std::map<FieldKey, uint32_t, FieldKeyComparator> fields_;
std::map<ProtoKey, IdxAndDataOffset, ProtoKeyComparator> protos_;
std::map<MethodKey, uint32_t, MethodKeyComparator> methods_;
std::vector<uint8_t> dex_file_data_;
};
} // namespace art
#endif // ART_LIBDEXFILE_DEX_TEST_DEX_FILE_BUILDER_H_