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allwinner_a64/android/art/runtime/dex_file.cc
August b9e30e05b1 upload android base code part3
2018-08-08 16:48:17 +08:00

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/*
* Copyright (C) 2011 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 "dex_file.h"
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/file.h>
#include <sys/mman.h> // For the PROT_* and MAP_* constants.
#include <sys/stat.h>
#include <zlib.h>
#include <memory>
#include <sstream>
#include <type_traits>
#include "android-base/stringprintf.h"
#include "base/enums.h"
#include "base/file_magic.h"
#include "base/logging.h"
#include "base/stl_util.h"
#include "base/systrace.h"
#include "base/unix_file/fd_file.h"
#include "dex_file-inl.h"
#include "dex_file_verifier.h"
#include "jvalue.h"
#include "leb128.h"
#include "os.h"
#include "utf-inl.h"
#include "utils.h"
#include "zip_archive.h"
namespace art {
using android::base::StringPrintf;
static_assert(sizeof(dex::StringIndex) == sizeof(uint32_t), "StringIndex size is wrong");
static_assert(std::is_trivially_copyable<dex::StringIndex>::value, "StringIndex not trivial");
static_assert(sizeof(dex::TypeIndex) == sizeof(uint16_t), "TypeIndex size is wrong");
static_assert(std::is_trivially_copyable<dex::TypeIndex>::value, "TypeIndex not trivial");
static constexpr OatDexFile* kNoOatDexFile = nullptr;
const char* DexFile::kClassesDex = "classes.dex";
const uint8_t DexFile::kDexMagic[] = { 'd', 'e', 'x', '\n' };
const uint8_t DexFile::kDexMagicVersions[DexFile::kNumDexVersions][DexFile::kDexVersionLen] = {
{'0', '3', '5', '\0'},
// Dex version 036 skipped because of an old dalvik bug on some versions of android where dex
// files with that version number would erroneously be accepted and run.
{'0', '3', '7', '\0'},
// Dex version 038: Android "O" and beyond.
{'0', '3', '8', '\0'}
};
uint32_t DexFile::CalculateChecksum() const {
const uint32_t non_sum = OFFSETOF_MEMBER(DexFile::Header, signature_);
const uint8_t* non_sum_ptr = Begin() + non_sum;
return adler32(adler32(0L, Z_NULL, 0), non_sum_ptr, Size() - non_sum);
}
struct DexFile::AnnotationValue {
JValue value_;
uint8_t type_;
};
bool DexFile::GetMultiDexChecksums(const char* filename,
std::vector<uint32_t>* checksums,
std::string* error_msg) {
CHECK(checksums != nullptr);
uint32_t magic;
File fd = OpenAndReadMagic(filename, &magic, error_msg);
if (fd.Fd() == -1) {
DCHECK(!error_msg->empty());
return false;
}
if (IsZipMagic(magic)) {
std::unique_ptr<ZipArchive> zip_archive(
ZipArchive::OpenFromFd(fd.Release(), filename, error_msg));
if (zip_archive.get() == nullptr) {
*error_msg = StringPrintf("Failed to open zip archive '%s' (error msg: %s)", filename,
error_msg->c_str());
return false;
}
uint32_t i = 0;
std::string zip_entry_name = GetMultiDexClassesDexName(i++);
std::unique_ptr<ZipEntry> zip_entry(zip_archive->Find(zip_entry_name.c_str(), error_msg));
if (zip_entry.get() == nullptr) {
*error_msg = StringPrintf("Zip archive '%s' doesn't contain %s (error msg: %s)", filename,
zip_entry_name.c_str(), error_msg->c_str());
return false;
}
do {
checksums->push_back(zip_entry->GetCrc32());
zip_entry_name = DexFile::GetMultiDexClassesDexName(i++);
zip_entry.reset(zip_archive->Find(zip_entry_name.c_str(), error_msg));
} while (zip_entry.get() != nullptr);
return true;
}
if (IsDexMagic(magic)) {
std::unique_ptr<const DexFile> dex_file(
DexFile::OpenFile(fd.Release(), filename, false, false, error_msg));
if (dex_file.get() == nullptr) {
return false;
}
checksums->push_back(dex_file->GetHeader().checksum_);
return true;
}
*error_msg = StringPrintf("Expected valid zip or dex file: '%s'", filename);
return false;
}
int DexFile::GetPermissions() const {
if (mem_map_.get() == nullptr) {
return 0;
} else {
return mem_map_->GetProtect();
}
}
bool DexFile::IsReadOnly() const {
return GetPermissions() == PROT_READ;
}
bool DexFile::EnableWrite() const {
CHECK(IsReadOnly());
if (mem_map_.get() == nullptr) {
return false;
} else {
return mem_map_->Protect(PROT_READ | PROT_WRITE);
}
}
bool DexFile::DisableWrite() const {
CHECK(!IsReadOnly());
if (mem_map_.get() == nullptr) {
return false;
} else {
return mem_map_->Protect(PROT_READ);
}
}
std::unique_ptr<const DexFile> DexFile::Open(const uint8_t* base,
size_t size,
const std::string& location,
uint32_t location_checksum,
const OatDexFile* oat_dex_file,
bool verify,
bool verify_checksum,
std::string* error_msg) {
ScopedTrace trace(std::string("Open dex file from RAM ") + location);
return OpenCommon(base,
size,
location,
location_checksum,
oat_dex_file,
verify,
verify_checksum,
error_msg);
}
std::unique_ptr<const DexFile> DexFile::Open(const std::string& location,
uint32_t location_checksum,
std::unique_ptr<MemMap> map,
bool verify,
bool verify_checksum,
std::string* error_msg) {
ScopedTrace trace(std::string("Open dex file from mapped-memory ") + location);
CHECK(map.get() != nullptr);
if (map->Size() < sizeof(DexFile::Header)) {
*error_msg = StringPrintf(
"DexFile: failed to open dex file '%s' that is too short to have a header",
location.c_str());
return nullptr;
}
std::unique_ptr<DexFile> dex_file = OpenCommon(map->Begin(),
map->Size(),
location,
location_checksum,
kNoOatDexFile,
verify,
verify_checksum,
error_msg);
if (dex_file != nullptr) {
dex_file->mem_map_ = std::move(map);
}
return dex_file;
}
bool DexFile::Open(const char* filename,
const std::string& location,
bool verify_checksum,
std::string* error_msg,
std::vector<std::unique_ptr<const DexFile>>* dex_files) {
ScopedTrace trace(std::string("Open dex file ") + std::string(location));
DCHECK(dex_files != nullptr) << "DexFile::Open: out-param is nullptr";
uint32_t magic;
File fd = OpenAndReadMagic(filename, &magic, error_msg);
if (fd.Fd() == -1) {
DCHECK(!error_msg->empty());
return false;
}
if (IsZipMagic(magic)) {
return DexFile::OpenZip(fd.Release(), location, verify_checksum, error_msg, dex_files);
}
if (IsDexMagic(magic)) {
std::unique_ptr<const DexFile> dex_file(DexFile::OpenFile(fd.Release(),
location,
/* verify */ true,
verify_checksum,
error_msg));
if (dex_file.get() != nullptr) {
dex_files->push_back(std::move(dex_file));
return true;
} else {
return false;
}
}
*error_msg = StringPrintf("Expected valid zip or dex file: '%s'", filename);
return false;
}
std::unique_ptr<const DexFile> DexFile::OpenDex(int fd,
const std::string& location,
bool verify_checksum,
std::string* error_msg) {
ScopedTrace trace("Open dex file " + std::string(location));
return OpenFile(fd, location, true /* verify */, verify_checksum, error_msg);
}
bool DexFile::OpenZip(int fd,
const std::string& location,
bool verify_checksum,
std::string* error_msg,
std::vector<std::unique_ptr<const DexFile>>* dex_files) {
ScopedTrace trace("Dex file open Zip " + std::string(location));
DCHECK(dex_files != nullptr) << "DexFile::OpenZip: out-param is nullptr";
std::unique_ptr<ZipArchive> zip_archive(ZipArchive::OpenFromFd(fd, location.c_str(), error_msg));
if (zip_archive.get() == nullptr) {
DCHECK(!error_msg->empty());
return false;
}
return DexFile::OpenAllDexFilesFromZip(*zip_archive,
location,
verify_checksum,
error_msg,
dex_files);
}
std::unique_ptr<const DexFile> DexFile::OpenFile(int fd,
const std::string& location,
bool verify,
bool verify_checksum,
std::string* error_msg) {
ScopedTrace trace(std::string("Open dex file ") + std::string(location));
CHECK(!location.empty());
std::unique_ptr<MemMap> map;
{
File delayed_close(fd, /* check_usage */ false);
struct stat sbuf;
memset(&sbuf, 0, sizeof(sbuf));
if (fstat(fd, &sbuf) == -1) {
*error_msg = StringPrintf("DexFile: fstat '%s' failed: %s", location.c_str(),
strerror(errno));
return nullptr;
}
if (S_ISDIR(sbuf.st_mode)) {
*error_msg = StringPrintf("Attempt to mmap directory '%s'", location.c_str());
return nullptr;
}
size_t length = sbuf.st_size;
map.reset(MemMap::MapFile(length,
PROT_READ,
MAP_PRIVATE,
fd,
0,
/*low_4gb*/false,
location.c_str(),
error_msg));
if (map == nullptr) {
DCHECK(!error_msg->empty());
return nullptr;
}
}
if (map->Size() < sizeof(DexFile::Header)) {
*error_msg = StringPrintf(
"DexFile: failed to open dex file '%s' that is too short to have a header",
location.c_str());
return nullptr;
}
const Header* dex_header = reinterpret_cast<const Header*>(map->Begin());
std::unique_ptr<DexFile> dex_file = OpenCommon(map->Begin(),
map->Size(),
location,
dex_header->checksum_,
kNoOatDexFile,
verify,
verify_checksum,
error_msg);
if (dex_file != nullptr) {
dex_file->mem_map_ = std::move(map);
}
return dex_file;
}
std::unique_ptr<const DexFile> DexFile::OpenOneDexFileFromZip(const ZipArchive& zip_archive,
const char* entry_name,
const std::string& location,
bool verify_checksum,
std::string* error_msg,
ZipOpenErrorCode* error_code) {
ScopedTrace trace("Dex file open from Zip Archive " + std::string(location));
CHECK(!location.empty());
std::unique_ptr<ZipEntry> zip_entry(zip_archive.Find(entry_name, error_msg));
if (zip_entry == nullptr) {
*error_code = ZipOpenErrorCode::kEntryNotFound;
return nullptr;
}
if (zip_entry->GetUncompressedLength() == 0) {
*error_msg = StringPrintf("Dex file '%s' has zero length", location.c_str());
*error_code = ZipOpenErrorCode::kDexFileError;
return nullptr;
}
std::unique_ptr<MemMap> map;
if (zip_entry->IsUncompressed()) {
if (!zip_entry->IsAlignedTo(alignof(Header))) {
// Do not mmap unaligned ZIP entries because
// doing so would fail dex verification which requires 4 byte alignment.
LOG(WARNING) << "Can't mmap dex file " << location << "!" << entry_name << " directly; "
<< "please zipalign to " << alignof(Header) << " bytes. "
<< "Falling back to extracting file.";
} else {
// Map uncompressed files within zip as file-backed to avoid a dirty copy.
map.reset(zip_entry->MapDirectlyFromFile(location.c_str(), /*out*/error_msg));
if (map == nullptr) {
LOG(WARNING) << "Can't mmap dex file " << location << "!" << entry_name << " directly; "
<< "is your ZIP file corrupted? Falling back to extraction.";
// Try again with Extraction which still has a chance of recovery.
}
}
}
if (map == nullptr) {
// Default path for compressed ZIP entries,
// and fallback for stored ZIP entries.
map.reset(zip_entry->ExtractToMemMap(location.c_str(), entry_name, error_msg));
}
if (map == nullptr) {
*error_msg = StringPrintf("Failed to extract '%s' from '%s': %s", entry_name, location.c_str(),
error_msg->c_str());
*error_code = ZipOpenErrorCode::kExtractToMemoryError;
return nullptr;
}
VerifyResult verify_result;
std::unique_ptr<DexFile> dex_file = OpenCommon(map->Begin(),
map->Size(),
location,
zip_entry->GetCrc32(),
kNoOatDexFile,
/* verify */ true,
verify_checksum,
error_msg,
&verify_result);
if (dex_file == nullptr) {
if (verify_result == VerifyResult::kVerifyNotAttempted) {
*error_code = ZipOpenErrorCode::kDexFileError;
} else {
*error_code = ZipOpenErrorCode::kVerifyError;
}
return nullptr;
}
dex_file->mem_map_ = std::move(map);
if (!dex_file->DisableWrite()) {
*error_msg = StringPrintf("Failed to make dex file '%s' read only", location.c_str());
*error_code = ZipOpenErrorCode::kMakeReadOnlyError;
return nullptr;
}
CHECK(dex_file->IsReadOnly()) << location;
if (verify_result != VerifyResult::kVerifySucceeded) {
*error_code = ZipOpenErrorCode::kVerifyError;
return nullptr;
}
*error_code = ZipOpenErrorCode::kNoError;
return dex_file;
}
// Technically we do not have a limitation with respect to the number of dex files that can be in a
// multidex APK. However, it's bad practice, as each dex file requires its own tables for symbols
// (types, classes, methods, ...) and dex caches. So warn the user that we open a zip with what
// seems an excessive number.
static constexpr size_t kWarnOnManyDexFilesThreshold = 100;
bool DexFile::OpenAllDexFilesFromZip(const ZipArchive& zip_archive,
const std::string& location,
bool verify_checksum,
std::string* error_msg,
std::vector<std::unique_ptr<const DexFile>>* dex_files) {
ScopedTrace trace("Dex file open from Zip " + std::string(location));
DCHECK(dex_files != nullptr) << "DexFile::OpenFromZip: out-param is nullptr";
ZipOpenErrorCode error_code;
std::unique_ptr<const DexFile> dex_file(OpenOneDexFileFromZip(zip_archive,
kClassesDex,
location,
verify_checksum,
error_msg,
&error_code));
if (dex_file.get() == nullptr) {
return false;
} else {
// Had at least classes.dex.
dex_files->push_back(std::move(dex_file));
// Now try some more.
// We could try to avoid std::string allocations by working on a char array directly. As we
// do not expect a lot of iterations, this seems too involved and brittle.
for (size_t i = 1; ; ++i) {
std::string name = GetMultiDexClassesDexName(i);
std::string fake_location = GetMultiDexLocation(i, location.c_str());
std::unique_ptr<const DexFile> next_dex_file(OpenOneDexFileFromZip(zip_archive,
name.c_str(),
fake_location,
verify_checksum,
error_msg,
&error_code));
if (next_dex_file.get() == nullptr) {
if (error_code != ZipOpenErrorCode::kEntryNotFound) {
LOG(WARNING) << "Zip open failed: " << *error_msg;
}
break;
} else {
dex_files->push_back(std::move(next_dex_file));
}
if (i == kWarnOnManyDexFilesThreshold) {
LOG(WARNING) << location << " has in excess of " << kWarnOnManyDexFilesThreshold
<< " dex files. Please consider coalescing and shrinking the number to "
" avoid runtime overhead.";
}
if (i == std::numeric_limits<size_t>::max()) {
LOG(ERROR) << "Overflow in number of dex files!";
break;
}
}
return true;
}
}
std::unique_ptr<DexFile> DexFile::OpenCommon(const uint8_t* base,
size_t size,
const std::string& location,
uint32_t location_checksum,
const OatDexFile* oat_dex_file,
bool verify,
bool verify_checksum,
std::string* error_msg,
VerifyResult* verify_result) {
if (verify_result != nullptr) {
*verify_result = VerifyResult::kVerifyNotAttempted;
}
std::unique_ptr<DexFile> dex_file(new DexFile(base,
size,
location,
location_checksum,
oat_dex_file));
if (dex_file == nullptr) {
*error_msg = StringPrintf("Failed to open dex file '%s' from memory: %s", location.c_str(),
error_msg->c_str());
return nullptr;
}
if (!dex_file->Init(error_msg)) {
dex_file.reset();
return nullptr;
}
if (verify && !DexFileVerifier::Verify(dex_file.get(),
dex_file->Begin(),
dex_file->Size(),
location.c_str(),
verify_checksum,
error_msg)) {
if (verify_result != nullptr) {
*verify_result = VerifyResult::kVerifyFailed;
}
return nullptr;
}
if (verify_result != nullptr) {
*verify_result = VerifyResult::kVerifySucceeded;
}
return dex_file;
}
DexFile::DexFile(const uint8_t* base,
size_t size,
const std::string& location,
uint32_t location_checksum,
const OatDexFile* oat_dex_file)
: begin_(base),
size_(size),
location_(location),
location_checksum_(location_checksum),
header_(reinterpret_cast<const Header*>(base)),
string_ids_(reinterpret_cast<const StringId*>(base + header_->string_ids_off_)),
type_ids_(reinterpret_cast<const TypeId*>(base + header_->type_ids_off_)),
field_ids_(reinterpret_cast<const FieldId*>(base + header_->field_ids_off_)),
method_ids_(reinterpret_cast<const MethodId*>(base + header_->method_ids_off_)),
proto_ids_(reinterpret_cast<const ProtoId*>(base + header_->proto_ids_off_)),
class_defs_(reinterpret_cast<const ClassDef*>(base + header_->class_defs_off_)),
method_handles_(nullptr),
num_method_handles_(0),
call_site_ids_(nullptr),
num_call_site_ids_(0),
oat_dex_file_(oat_dex_file) {
CHECK(begin_ != nullptr) << GetLocation();
CHECK_GT(size_, 0U) << GetLocation();
// Check base (=header) alignment.
// Must be 4-byte aligned to avoid undefined behavior when accessing
// any of the sections via a pointer.
CHECK_ALIGNED(begin_, alignof(Header));
InitializeSectionsFromMapList();
}
DexFile::~DexFile() {
// We don't call DeleteGlobalRef on dex_object_ because we're only called by DestroyJavaVM, and
// that's only called after DetachCurrentThread, which means there's no JNIEnv. We could
// re-attach, but cleaning up these global references is not obviously useful. It's not as if
// the global reference table is otherwise empty!
}
bool DexFile::Init(std::string* error_msg) {
if (!CheckMagicAndVersion(error_msg)) {
return false;
}
return true;
}
bool DexFile::CheckMagicAndVersion(std::string* error_msg) const {
if (!IsMagicValid(header_->magic_)) {
std::ostringstream oss;
oss << "Unrecognized magic number in " << GetLocation() << ":"
<< " " << header_->magic_[0]
<< " " << header_->magic_[1]
<< " " << header_->magic_[2]
<< " " << header_->magic_[3];
*error_msg = oss.str();
return false;
}
if (!IsVersionValid(header_->magic_)) {
std::ostringstream oss;
oss << "Unrecognized version number in " << GetLocation() << ":"
<< " " << header_->magic_[4]
<< " " << header_->magic_[5]
<< " " << header_->magic_[6]
<< " " << header_->magic_[7];
*error_msg = oss.str();
return false;
}
return true;
}
void DexFile::InitializeSectionsFromMapList() {
const MapList* map_list = reinterpret_cast<const MapList*>(begin_ + header_->map_off_);
if (header_->map_off_ == 0 || header_->map_off_ > size_) {
// Bad offset. The dex file verifier runs after this method and will reject the file.
return;
}
const size_t count = map_list->size_;
size_t map_limit = header_->map_off_ + count * sizeof(MapItem);
if (header_->map_off_ >= map_limit || map_limit > size_) {
// Overflow or out out of bounds. The dex file verifier runs after
// this method and will reject the file as it is malformed.
return;
}
for (size_t i = 0; i < count; ++i) {
const MapItem& map_item = map_list->list_[i];
if (map_item.type_ == kDexTypeMethodHandleItem) {
method_handles_ = reinterpret_cast<const MethodHandleItem*>(begin_ + map_item.offset_);
num_method_handles_ = map_item.size_;
} else if (map_item.type_ == kDexTypeCallSiteIdItem) {
call_site_ids_ = reinterpret_cast<const CallSiteIdItem*>(begin_ + map_item.offset_);
num_call_site_ids_ = map_item.size_;
}
}
}
bool DexFile::IsMagicValid(const uint8_t* magic) {
return (memcmp(magic, kDexMagic, sizeof(kDexMagic)) == 0);
}
bool DexFile::IsVersionValid(const uint8_t* magic) {
const uint8_t* version = &magic[sizeof(kDexMagic)];
for (uint32_t i = 0; i < kNumDexVersions; i++) {
if (memcmp(version, kDexMagicVersions[i], kDexVersionLen) == 0) {
return true;
}
}
return false;
}
uint32_t DexFile::Header::GetVersion() const {
const char* version = reinterpret_cast<const char*>(&magic_[sizeof(kDexMagic)]);
return atoi(version);
}
const DexFile::ClassDef* DexFile::FindClassDef(dex::TypeIndex type_idx) const {
size_t num_class_defs = NumClassDefs();
// Fast path for rare no class defs case.
if (num_class_defs == 0) {
return nullptr;
}
for (size_t i = 0; i < num_class_defs; ++i) {
const ClassDef& class_def = GetClassDef(i);
if (class_def.class_idx_ == type_idx) {
return &class_def;
}
}
return nullptr;
}
uint32_t DexFile::FindCodeItemOffset(const DexFile::ClassDef& class_def,
uint32_t method_idx) const {
const uint8_t* class_data = GetClassData(class_def);
CHECK(class_data != nullptr);
ClassDataItemIterator it(*this, class_data);
it.SkipAllFields();
while (it.HasNextDirectMethod()) {
if (it.GetMemberIndex() == method_idx) {
return it.GetMethodCodeItemOffset();
}
it.Next();
}
while (it.HasNextVirtualMethod()) {
if (it.GetMemberIndex() == method_idx) {
return it.GetMethodCodeItemOffset();
}
it.Next();
}
LOG(FATAL) << "Unable to find method " << method_idx;
UNREACHABLE();
}
uint32_t DexFile::GetCodeItemSize(const DexFile::CodeItem& code_item) {
uintptr_t code_item_start = reinterpret_cast<uintptr_t>(&code_item);
uint32_t insns_size = code_item.insns_size_in_code_units_;
uint32_t tries_size = code_item.tries_size_;
const uint8_t* handler_data = GetCatchHandlerData(code_item, 0);
if (tries_size == 0 || handler_data == nullptr) {
uintptr_t insns_end = reinterpret_cast<uintptr_t>(&code_item.insns_[insns_size]);
return insns_end - code_item_start;
} else {
// Get the start of the handler data.
uint32_t handlers_size = DecodeUnsignedLeb128(&handler_data);
// Manually read each handler.
for (uint32_t i = 0; i < handlers_size; ++i) {
int32_t uleb128_count = DecodeSignedLeb128(&handler_data) * 2;
if (uleb128_count <= 0) {
uleb128_count = -uleb128_count + 1;
}
for (int32_t j = 0; j < uleb128_count; ++j) {
DecodeUnsignedLeb128(&handler_data);
}
}
return reinterpret_cast<uintptr_t>(handler_data) - code_item_start;
}
}
const DexFile::FieldId* DexFile::FindFieldId(const DexFile::TypeId& declaring_klass,
const DexFile::StringId& name,
const DexFile::TypeId& type) const {
// Binary search MethodIds knowing that they are sorted by class_idx, name_idx then proto_idx
const dex::TypeIndex class_idx = GetIndexForTypeId(declaring_klass);
const dex::StringIndex name_idx = GetIndexForStringId(name);
const dex::TypeIndex type_idx = GetIndexForTypeId(type);
int32_t lo = 0;
int32_t hi = NumFieldIds() - 1;
while (hi >= lo) {
int32_t mid = (hi + lo) / 2;
const DexFile::FieldId& field = GetFieldId(mid);
if (class_idx > field.class_idx_) {
lo = mid + 1;
} else if (class_idx < field.class_idx_) {
hi = mid - 1;
} else {
if (name_idx > field.name_idx_) {
lo = mid + 1;
} else if (name_idx < field.name_idx_) {
hi = mid - 1;
} else {
if (type_idx > field.type_idx_) {
lo = mid + 1;
} else if (type_idx < field.type_idx_) {
hi = mid - 1;
} else {
return &field;
}
}
}
}
return nullptr;
}
const DexFile::MethodId* DexFile::FindMethodId(const DexFile::TypeId& declaring_klass,
const DexFile::StringId& name,
const DexFile::ProtoId& signature) const {
// Binary search MethodIds knowing that they are sorted by class_idx, name_idx then proto_idx
const dex::TypeIndex class_idx = GetIndexForTypeId(declaring_klass);
const dex::StringIndex name_idx = GetIndexForStringId(name);
const uint16_t proto_idx = GetIndexForProtoId(signature);
int32_t lo = 0;
int32_t hi = NumMethodIds() - 1;
while (hi >= lo) {
int32_t mid = (hi + lo) / 2;
const DexFile::MethodId& method = GetMethodId(mid);
if (class_idx > method.class_idx_) {
lo = mid + 1;
} else if (class_idx < method.class_idx_) {
hi = mid - 1;
} else {
if (name_idx > method.name_idx_) {
lo = mid + 1;
} else if (name_idx < method.name_idx_) {
hi = mid - 1;
} else {
if (proto_idx > method.proto_idx_) {
lo = mid + 1;
} else if (proto_idx < method.proto_idx_) {
hi = mid - 1;
} else {
return &method;
}
}
}
}
return nullptr;
}
const DexFile::StringId* DexFile::FindStringId(const char* string) const {
int32_t lo = 0;
int32_t hi = NumStringIds() - 1;
while (hi >= lo) {
int32_t mid = (hi + lo) / 2;
const DexFile::StringId& str_id = GetStringId(dex::StringIndex(mid));
const char* str = GetStringData(str_id);
int compare = CompareModifiedUtf8ToModifiedUtf8AsUtf16CodePointValues(string, str);
if (compare > 0) {
lo = mid + 1;
} else if (compare < 0) {
hi = mid - 1;
} else {
return &str_id;
}
}
return nullptr;
}
const DexFile::TypeId* DexFile::FindTypeId(const char* string) const {
int32_t lo = 0;
int32_t hi = NumTypeIds() - 1;
while (hi >= lo) {
int32_t mid = (hi + lo) / 2;
const TypeId& type_id = GetTypeId(dex::TypeIndex(mid));
const DexFile::StringId& str_id = GetStringId(type_id.descriptor_idx_);
const char* str = GetStringData(str_id);
int compare = CompareModifiedUtf8ToModifiedUtf8AsUtf16CodePointValues(string, str);
if (compare > 0) {
lo = mid + 1;
} else if (compare < 0) {
hi = mid - 1;
} else {
return &type_id;
}
}
return nullptr;
}
const DexFile::StringId* DexFile::FindStringId(const uint16_t* string, size_t length) const {
int32_t lo = 0;
int32_t hi = NumStringIds() - 1;
while (hi >= lo) {
int32_t mid = (hi + lo) / 2;
const DexFile::StringId& str_id = GetStringId(dex::StringIndex(mid));
const char* str = GetStringData(str_id);
int compare = CompareModifiedUtf8ToUtf16AsCodePointValues(str, string, length);
if (compare > 0) {
lo = mid + 1;
} else if (compare < 0) {
hi = mid - 1;
} else {
return &str_id;
}
}
return nullptr;
}
const DexFile::TypeId* DexFile::FindTypeId(dex::StringIndex string_idx) const {
int32_t lo = 0;
int32_t hi = NumTypeIds() - 1;
while (hi >= lo) {
int32_t mid = (hi + lo) / 2;
const TypeId& type_id = GetTypeId(dex::TypeIndex(mid));
if (string_idx > type_id.descriptor_idx_) {
lo = mid + 1;
} else if (string_idx < type_id.descriptor_idx_) {
hi = mid - 1;
} else {
return &type_id;
}
}
return nullptr;
}
const DexFile::ProtoId* DexFile::FindProtoId(dex::TypeIndex return_type_idx,
const dex::TypeIndex* signature_type_idxs,
uint32_t signature_length) const {
int32_t lo = 0;
int32_t hi = NumProtoIds() - 1;
while (hi >= lo) {
int32_t mid = (hi + lo) / 2;
const DexFile::ProtoId& proto = GetProtoId(mid);
int compare = return_type_idx.index_ - proto.return_type_idx_.index_;
if (compare == 0) {
DexFileParameterIterator it(*this, proto);
size_t i = 0;
while (it.HasNext() && i < signature_length && compare == 0) {
compare = signature_type_idxs[i].index_ - it.GetTypeIdx().index_;
it.Next();
i++;
}
if (compare == 0) {
if (it.HasNext()) {
compare = -1;
} else if (i < signature_length) {
compare = 1;
}
}
}
if (compare > 0) {
lo = mid + 1;
} else if (compare < 0) {
hi = mid - 1;
} else {
return &proto;
}
}
return nullptr;
}
// Given a signature place the type ids into the given vector
bool DexFile::CreateTypeList(const StringPiece& signature,
dex::TypeIndex* return_type_idx,
std::vector<dex::TypeIndex>* param_type_idxs) const {
if (signature[0] != '(') {
return false;
}
size_t offset = 1;
size_t end = signature.size();
bool process_return = false;
while (offset < end) {
size_t start_offset = offset;
char c = signature[offset];
offset++;
if (c == ')') {
process_return = true;
continue;
}
while (c == '[') { // process array prefix
if (offset >= end) { // expect some descriptor following [
return false;
}
c = signature[offset];
offset++;
}
if (c == 'L') { // process type descriptors
do {
if (offset >= end) { // unexpected early termination of descriptor
return false;
}
c = signature[offset];
offset++;
} while (c != ';');
}
// TODO: avoid creating a std::string just to get a 0-terminated char array
std::string descriptor(signature.data() + start_offset, offset - start_offset);
const DexFile::TypeId* type_id = FindTypeId(descriptor.c_str());
if (type_id == nullptr) {
return false;
}
dex::TypeIndex type_idx = GetIndexForTypeId(*type_id);
if (!process_return) {
param_type_idxs->push_back(type_idx);
} else {
*return_type_idx = type_idx;
return offset == end; // return true if the signature had reached a sensible end
}
}
return false; // failed to correctly parse return type
}
const Signature DexFile::CreateSignature(const StringPiece& signature) const {
dex::TypeIndex return_type_idx;
std::vector<dex::TypeIndex> param_type_indices;
bool success = CreateTypeList(signature, &return_type_idx, &param_type_indices);
if (!success) {
return Signature::NoSignature();
}
const ProtoId* proto_id = FindProtoId(return_type_idx, param_type_indices);
if (proto_id == nullptr) {
return Signature::NoSignature();
}
return Signature(this, *proto_id);
}
int32_t DexFile::FindTryItem(const CodeItem &code_item, uint32_t address) {
// Note: Signed type is important for max and min.
int32_t min = 0;
int32_t max = code_item.tries_size_ - 1;
while (min <= max) {
int32_t mid = min + ((max - min) / 2);
const art::DexFile::TryItem* ti = GetTryItems(code_item, mid);
uint32_t start = ti->start_addr_;
uint32_t end = start + ti->insn_count_;
if (address < start) {
max = mid - 1;
} else if (address >= end) {
min = mid + 1;
} else { // We have a winner!
return mid;
}
}
// No match.
return -1;
}
int32_t DexFile::FindCatchHandlerOffset(const CodeItem &code_item, uint32_t address) {
int32_t try_item = FindTryItem(code_item, address);
if (try_item == -1) {
return -1;
} else {
return DexFile::GetTryItems(code_item, try_item)->handler_off_;
}
}
bool DexFile::DecodeDebugLocalInfo(const CodeItem* code_item, bool is_static, uint32_t method_idx,
DexDebugNewLocalCb local_cb, void* context) const {
DCHECK(local_cb != nullptr);
if (code_item == nullptr) {
return false;
}
const uint8_t* stream = GetDebugInfoStream(code_item);
if (stream == nullptr) {
return false;
}
std::vector<LocalInfo> local_in_reg(code_item->registers_size_);
uint16_t arg_reg = code_item->registers_size_ - code_item->ins_size_;
if (!is_static) {
const char* descriptor = GetMethodDeclaringClassDescriptor(GetMethodId(method_idx));
local_in_reg[arg_reg].name_ = "this";
local_in_reg[arg_reg].descriptor_ = descriptor;
local_in_reg[arg_reg].signature_ = nullptr;
local_in_reg[arg_reg].start_address_ = 0;
local_in_reg[arg_reg].reg_ = arg_reg;
local_in_reg[arg_reg].is_live_ = true;
arg_reg++;
}
DexFileParameterIterator it(*this, GetMethodPrototype(GetMethodId(method_idx)));
DecodeUnsignedLeb128(&stream); // Line.
uint32_t parameters_size = DecodeUnsignedLeb128(&stream);
uint32_t i;
for (i = 0; i < parameters_size && it.HasNext(); ++i, it.Next()) {
if (arg_reg >= code_item->registers_size_) {
LOG(ERROR) << "invalid stream - arg reg >= reg size (" << arg_reg
<< " >= " << code_item->registers_size_ << ") in " << GetLocation();
return false;
}
uint32_t name_idx = DecodeUnsignedLeb128P1(&stream);
const char* descriptor = it.GetDescriptor();
local_in_reg[arg_reg].name_ = StringDataByIdx(dex::StringIndex(name_idx));
local_in_reg[arg_reg].descriptor_ = descriptor;
local_in_reg[arg_reg].signature_ = nullptr;
local_in_reg[arg_reg].start_address_ = 0;
local_in_reg[arg_reg].reg_ = arg_reg;
local_in_reg[arg_reg].is_live_ = true;
switch (*descriptor) {
case 'D':
case 'J':
arg_reg += 2;
break;
default:
arg_reg += 1;
break;
}
}
if (i != parameters_size || it.HasNext()) {
LOG(ERROR) << "invalid stream - problem with parameter iterator in " << GetLocation()
<< " for method " << this->PrettyMethod(method_idx);
return false;
}
uint32_t address = 0;
for (;;) {
uint8_t opcode = *stream++;
switch (opcode) {
case DBG_END_SEQUENCE:
// Emit all variables which are still alive at the end of the method.
for (uint16_t reg = 0; reg < code_item->registers_size_; reg++) {
if (local_in_reg[reg].is_live_) {
local_in_reg[reg].end_address_ = code_item->insns_size_in_code_units_;
local_cb(context, local_in_reg[reg]);
}
}
return true;
case DBG_ADVANCE_PC:
address += DecodeUnsignedLeb128(&stream);
break;
case DBG_ADVANCE_LINE:
DecodeSignedLeb128(&stream); // Line.
break;
case DBG_START_LOCAL:
case DBG_START_LOCAL_EXTENDED: {
uint16_t reg = DecodeUnsignedLeb128(&stream);
if (reg >= code_item->registers_size_) {
LOG(ERROR) << "invalid stream - reg >= reg size (" << reg << " >= "
<< code_item->registers_size_ << ") in " << GetLocation();
return false;
}
uint32_t name_idx = DecodeUnsignedLeb128P1(&stream);
uint16_t descriptor_idx = DecodeUnsignedLeb128P1(&stream);
uint32_t signature_idx = kDexNoIndex;
if (opcode == DBG_START_LOCAL_EXTENDED) {
signature_idx = DecodeUnsignedLeb128P1(&stream);
}
// Emit what was previously there, if anything
if (local_in_reg[reg].is_live_) {
local_in_reg[reg].end_address_ = address;
local_cb(context, local_in_reg[reg]);
}
local_in_reg[reg].name_ = StringDataByIdx(dex::StringIndex(name_idx));
local_in_reg[reg].descriptor_ =
StringByTypeIdx(dex::TypeIndex(dchecked_integral_cast<uint16_t>(descriptor_idx)));;
local_in_reg[reg].signature_ = StringDataByIdx(dex::StringIndex(signature_idx));
local_in_reg[reg].start_address_ = address;
local_in_reg[reg].reg_ = reg;
local_in_reg[reg].is_live_ = true;
break;
}
case DBG_END_LOCAL: {
uint16_t reg = DecodeUnsignedLeb128(&stream);
if (reg >= code_item->registers_size_) {
LOG(ERROR) << "invalid stream - reg >= reg size (" << reg << " >= "
<< code_item->registers_size_ << ") in " << GetLocation();
return false;
}
// If the register is live, close it properly. Otherwise, closing an already
// closed register is sloppy, but harmless if no further action is taken.
if (local_in_reg[reg].is_live_) {
local_in_reg[reg].end_address_ = address;
local_cb(context, local_in_reg[reg]);
local_in_reg[reg].is_live_ = false;
}
break;
}
case DBG_RESTART_LOCAL: {
uint16_t reg = DecodeUnsignedLeb128(&stream);
if (reg >= code_item->registers_size_) {
LOG(ERROR) << "invalid stream - reg >= reg size (" << reg << " >= "
<< code_item->registers_size_ << ") in " << GetLocation();
return false;
}
// If the register is live, the "restart" is superfluous,
// and we don't want to mess with the existing start address.
if (!local_in_reg[reg].is_live_) {
local_in_reg[reg].start_address_ = address;
local_in_reg[reg].is_live_ = true;
}
break;
}
case DBG_SET_PROLOGUE_END:
case DBG_SET_EPILOGUE_BEGIN:
break;
case DBG_SET_FILE:
DecodeUnsignedLeb128P1(&stream); // name.
break;
default:
address += (opcode - DBG_FIRST_SPECIAL) / DBG_LINE_RANGE;
break;
}
}
}
bool DexFile::DecodeDebugPositionInfo(const CodeItem* code_item, DexDebugNewPositionCb position_cb,
void* context) const {
DCHECK(position_cb != nullptr);
if (code_item == nullptr) {
return false;
}
const uint8_t* stream = GetDebugInfoStream(code_item);
if (stream == nullptr) {
return false;
}
PositionInfo entry = PositionInfo();
entry.line_ = DecodeUnsignedLeb128(&stream);
uint32_t parameters_size = DecodeUnsignedLeb128(&stream);
for (uint32_t i = 0; i < parameters_size; ++i) {
DecodeUnsignedLeb128P1(&stream); // Parameter name.
}
for (;;) {
uint8_t opcode = *stream++;
switch (opcode) {
case DBG_END_SEQUENCE:
return true; // end of stream.
case DBG_ADVANCE_PC:
entry.address_ += DecodeUnsignedLeb128(&stream);
break;
case DBG_ADVANCE_LINE:
entry.line_ += DecodeSignedLeb128(&stream);
break;
case DBG_START_LOCAL:
DecodeUnsignedLeb128(&stream); // reg.
DecodeUnsignedLeb128P1(&stream); // name.
DecodeUnsignedLeb128P1(&stream); // descriptor.
break;
case DBG_START_LOCAL_EXTENDED:
DecodeUnsignedLeb128(&stream); // reg.
DecodeUnsignedLeb128P1(&stream); // name.
DecodeUnsignedLeb128P1(&stream); // descriptor.
DecodeUnsignedLeb128P1(&stream); // signature.
break;
case DBG_END_LOCAL:
case DBG_RESTART_LOCAL:
DecodeUnsignedLeb128(&stream); // reg.
break;
case DBG_SET_PROLOGUE_END:
entry.prologue_end_ = true;
break;
case DBG_SET_EPILOGUE_BEGIN:
entry.epilogue_begin_ = true;
break;
case DBG_SET_FILE: {
uint32_t name_idx = DecodeUnsignedLeb128P1(&stream);
entry.source_file_ = StringDataByIdx(dex::StringIndex(name_idx));
break;
}
default: {
int adjopcode = opcode - DBG_FIRST_SPECIAL;
entry.address_ += adjopcode / DBG_LINE_RANGE;
entry.line_ += DBG_LINE_BASE + (adjopcode % DBG_LINE_RANGE);
if (position_cb(context, entry)) {
return true; // early exit.
}
entry.prologue_end_ = false;
entry.epilogue_begin_ = false;
break;
}
}
}
}
bool DexFile::LineNumForPcCb(void* raw_context, const PositionInfo& entry) {
LineNumFromPcContext* context = reinterpret_cast<LineNumFromPcContext*>(raw_context);
// We know that this callback will be called in
// ascending address order, so keep going until we find
// a match or we've just gone past it.
if (entry.address_ > context->address_) {
// The line number from the previous positions callback
// wil be the final result.
return true;
} else {
context->line_num_ = entry.line_;
return entry.address_ == context->address_;
}
}
bool DexFile::IsMultiDexLocation(const char* location) {
return strrchr(location, kMultiDexSeparator) != nullptr;
}
std::string DexFile::GetMultiDexClassesDexName(size_t index) {
if (index == 0) {
return "classes.dex";
} else {
return StringPrintf("classes%zu.dex", index + 1);
}
}
std::string DexFile::GetMultiDexLocation(size_t index, const char* dex_location) {
if (index == 0) {
return dex_location;
} else {
return StringPrintf("%s" kMultiDexSeparatorString "classes%zu.dex", dex_location, index + 1);
}
}
std::string DexFile::GetDexCanonicalLocation(const char* dex_location) {
CHECK_NE(dex_location, static_cast<const char*>(nullptr));
std::string base_location = GetBaseLocation(dex_location);
const char* suffix = dex_location + base_location.size();
DCHECK(suffix[0] == 0 || suffix[0] == kMultiDexSeparator);
UniqueCPtr<const char[]> path(realpath(base_location.c_str(), nullptr));
if (path != nullptr && path.get() != base_location) {
return std::string(path.get()) + suffix;
} else if (suffix[0] == 0) {
return base_location;
} else {
return dex_location;
}
}
// Read a signed integer. "zwidth" is the zero-based byte count.
int32_t DexFile::ReadSignedInt(const uint8_t* ptr, int zwidth) {
int32_t val = 0;
for (int i = zwidth; i >= 0; --i) {
val = ((uint32_t)val >> 8) | (((int32_t)*ptr++) << 24);
}
val >>= (3 - zwidth) * 8;
return val;
}
// Read an unsigned integer. "zwidth" is the zero-based byte count,
// "fill_on_right" indicates which side we want to zero-fill from.
uint32_t DexFile::ReadUnsignedInt(const uint8_t* ptr, int zwidth, bool fill_on_right) {
uint32_t val = 0;
for (int i = zwidth; i >= 0; --i) {
val = (val >> 8) | (((uint32_t)*ptr++) << 24);
}
if (!fill_on_right) {
val >>= (3 - zwidth) * 8;
}
return val;
}
// Read a signed long. "zwidth" is the zero-based byte count.
int64_t DexFile::ReadSignedLong(const uint8_t* ptr, int zwidth) {
int64_t val = 0;
for (int i = zwidth; i >= 0; --i) {
val = ((uint64_t)val >> 8) | (((int64_t)*ptr++) << 56);
}
val >>= (7 - zwidth) * 8;
return val;
}
// Read an unsigned long. "zwidth" is the zero-based byte count,
// "fill_on_right" indicates which side we want to zero-fill from.
uint64_t DexFile::ReadUnsignedLong(const uint8_t* ptr, int zwidth, bool fill_on_right) {
uint64_t val = 0;
for (int i = zwidth; i >= 0; --i) {
val = (val >> 8) | (((uint64_t)*ptr++) << 56);
}
if (!fill_on_right) {
val >>= (7 - zwidth) * 8;
}
return val;
}
std::string DexFile::PrettyMethod(uint32_t method_idx, bool with_signature) const {
if (method_idx >= NumMethodIds()) {
return StringPrintf("<<invalid-method-idx-%d>>", method_idx);
}
const DexFile::MethodId& method_id = GetMethodId(method_idx);
std::string result(PrettyDescriptor(GetMethodDeclaringClassDescriptor(method_id)));
result += '.';
result += GetMethodName(method_id);
if (with_signature) {
const Signature signature = GetMethodSignature(method_id);
std::string sig_as_string(signature.ToString());
if (signature == Signature::NoSignature()) {
return result + sig_as_string;
}
result = PrettyReturnType(sig_as_string.c_str()) + " " + result +
PrettyArguments(sig_as_string.c_str());
}
return result;
}
std::string DexFile::PrettyField(uint32_t field_idx, bool with_type) const {
if (field_idx >= NumFieldIds()) {
return StringPrintf("<<invalid-field-idx-%d>>", field_idx);
}
const DexFile::FieldId& field_id = GetFieldId(field_idx);
std::string result;
if (with_type) {
result += GetFieldTypeDescriptor(field_id);
result += ' ';
}
result += PrettyDescriptor(GetFieldDeclaringClassDescriptor(field_id));
result += '.';
result += GetFieldName(field_id);
return result;
}
std::string DexFile::PrettyType(dex::TypeIndex type_idx) const {
if (type_idx.index_ >= NumTypeIds()) {
return StringPrintf("<<invalid-type-idx-%d>>", type_idx.index_);
}
const DexFile::TypeId& type_id = GetTypeId(type_idx);
return PrettyDescriptor(GetTypeDescriptor(type_id));
}
// Checks that visibility is as expected. Includes special behavior for M and
// before to allow runtime and build visibility when expecting runtime.
std::ostream& operator<<(std::ostream& os, const DexFile& dex_file) {
os << StringPrintf("[DexFile: %s dex-checksum=%08x location-checksum=%08x %p-%p]",
dex_file.GetLocation().c_str(),
dex_file.GetHeader().checksum_, dex_file.GetLocationChecksum(),
dex_file.Begin(), dex_file.Begin() + dex_file.Size());
return os;
}
std::string Signature::ToString() const {
if (dex_file_ == nullptr) {
CHECK(proto_id_ == nullptr);
return "<no signature>";
}
const DexFile::TypeList* params = dex_file_->GetProtoParameters(*proto_id_);
std::string result;
if (params == nullptr) {
result += "()";
} else {
result += "(";
for (uint32_t i = 0; i < params->Size(); ++i) {
result += dex_file_->StringByTypeIdx(params->GetTypeItem(i).type_idx_);
}
result += ")";
}
result += dex_file_->StringByTypeIdx(proto_id_->return_type_idx_);
return result;
}
uint32_t Signature::GetNumberOfParameters() const {
const DexFile::TypeList* params = dex_file_->GetProtoParameters(*proto_id_);
return (params != nullptr) ? params->Size() : 0;
}
bool Signature::IsVoid() const {
const char* return_type = dex_file_->GetReturnTypeDescriptor(*proto_id_);
return strcmp(return_type, "V") == 0;
}
bool Signature::operator==(const StringPiece& rhs) const {
if (dex_file_ == nullptr) {
return false;
}
StringPiece tail(rhs);
if (!tail.starts_with("(")) {
return false; // Invalid signature
}
tail.remove_prefix(1); // "(";
const DexFile::TypeList* params = dex_file_->GetProtoParameters(*proto_id_);
if (params != nullptr) {
for (uint32_t i = 0; i < params->Size(); ++i) {
StringPiece param(dex_file_->StringByTypeIdx(params->GetTypeItem(i).type_idx_));
if (!tail.starts_with(param)) {
return false;
}
tail.remove_prefix(param.length());
}
}
if (!tail.starts_with(")")) {
return false;
}
tail.remove_prefix(1); // ")";
return tail == dex_file_->StringByTypeIdx(proto_id_->return_type_idx_);
}
std::ostream& operator<<(std::ostream& os, const Signature& sig) {
return os << sig.ToString();
}
// Decodes the header section from the class data bytes.
void ClassDataItemIterator::ReadClassDataHeader() {
CHECK(ptr_pos_ != nullptr);
header_.static_fields_size_ = DecodeUnsignedLeb128(&ptr_pos_);
header_.instance_fields_size_ = DecodeUnsignedLeb128(&ptr_pos_);
header_.direct_methods_size_ = DecodeUnsignedLeb128(&ptr_pos_);
header_.virtual_methods_size_ = DecodeUnsignedLeb128(&ptr_pos_);
}
void ClassDataItemIterator::ReadClassDataField() {
field_.field_idx_delta_ = DecodeUnsignedLeb128(&ptr_pos_);
field_.access_flags_ = DecodeUnsignedLeb128(&ptr_pos_);
// The user of the iterator is responsible for checking if there
// are unordered or duplicate indexes.
}
void ClassDataItemIterator::ReadClassDataMethod() {
method_.method_idx_delta_ = DecodeUnsignedLeb128(&ptr_pos_);
method_.access_flags_ = DecodeUnsignedLeb128(&ptr_pos_);
method_.code_off_ = DecodeUnsignedLeb128(&ptr_pos_);
if (last_idx_ != 0 && method_.method_idx_delta_ == 0) {
LOG(WARNING) << "Duplicate method in " << dex_file_.GetLocation();
}
}
EncodedArrayValueIterator::EncodedArrayValueIterator(const DexFile& dex_file,
const uint8_t* array_data)
: dex_file_(dex_file),
array_size_(),
pos_(-1),
ptr_(array_data),
type_(kByte) {
array_size_ = (ptr_ != nullptr) ? DecodeUnsignedLeb128(&ptr_) : 0;
if (array_size_ > 0) {
Next();
}
}
void EncodedArrayValueIterator::Next() {
pos_++;
if (pos_ >= array_size_) {
return;
}
uint8_t value_type = *ptr_++;
uint8_t value_arg = value_type >> kEncodedValueArgShift;
size_t width = value_arg + 1; // assume and correct later
type_ = static_cast<ValueType>(value_type & kEncodedValueTypeMask);
switch (type_) {
case kBoolean:
jval_.i = (value_arg != 0) ? 1 : 0;
width = 0;
break;
case kByte:
jval_.i = DexFile::ReadSignedInt(ptr_, value_arg);
CHECK(IsInt<8>(jval_.i));
break;
case kShort:
jval_.i = DexFile::ReadSignedInt(ptr_, value_arg);
CHECK(IsInt<16>(jval_.i));
break;
case kChar:
jval_.i = DexFile::ReadUnsignedInt(ptr_, value_arg, false);
CHECK(IsUint<16>(jval_.i));
break;
case kInt:
jval_.i = DexFile::ReadSignedInt(ptr_, value_arg);
break;
case kLong:
jval_.j = DexFile::ReadSignedLong(ptr_, value_arg);
break;
case kFloat:
jval_.i = DexFile::ReadUnsignedInt(ptr_, value_arg, true);
break;
case kDouble:
jval_.j = DexFile::ReadUnsignedLong(ptr_, value_arg, true);
break;
case kString:
case kType:
case kMethodType:
case kMethodHandle:
jval_.i = DexFile::ReadUnsignedInt(ptr_, value_arg, false);
break;
case kField:
case kMethod:
case kEnum:
case kArray:
case kAnnotation:
UNIMPLEMENTED(FATAL) << ": type " << type_;
UNREACHABLE();
case kNull:
jval_.l = nullptr;
width = 0;
break;
default:
LOG(FATAL) << "Unreached";
UNREACHABLE();
}
ptr_ += width;
}
CatchHandlerIterator::CatchHandlerIterator(const DexFile::CodeItem& code_item, uint32_t address) {
handler_.address_ = -1;
int32_t offset = -1;
// Short-circuit the overwhelmingly common cases.
switch (code_item.tries_size_) {
case 0:
break;
case 1: {
const DexFile::TryItem* tries = DexFile::GetTryItems(code_item, 0);
uint32_t start = tries->start_addr_;
if (address >= start) {
uint32_t end = start + tries->insn_count_;
if (address < end) {
offset = tries->handler_off_;
}
}
break;
}
default:
offset = DexFile::FindCatchHandlerOffset(code_item, address);
}
Init(code_item, offset);
}
CatchHandlerIterator::CatchHandlerIterator(const DexFile::CodeItem& code_item,
const DexFile::TryItem& try_item) {
handler_.address_ = -1;
Init(code_item, try_item.handler_off_);
}
void CatchHandlerIterator::Init(const DexFile::CodeItem& code_item,
int32_t offset) {
if (offset >= 0) {
Init(DexFile::GetCatchHandlerData(code_item, offset));
} else {
// Not found, initialize as empty
current_data_ = nullptr;
remaining_count_ = -1;
catch_all_ = false;
DCHECK(!HasNext());
}
}
void CatchHandlerIterator::Init(const uint8_t* handler_data) {
current_data_ = handler_data;
remaining_count_ = DecodeSignedLeb128(&current_data_);
// If remaining_count_ is non-positive, then it is the negative of
// the number of catch types, and the catches are followed by a
// catch-all handler.
if (remaining_count_ <= 0) {
catch_all_ = true;
remaining_count_ = -remaining_count_;
} else {
catch_all_ = false;
}
Next();
}
void CatchHandlerIterator::Next() {
if (remaining_count_ > 0) {
handler_.type_idx_ = dex::TypeIndex(DecodeUnsignedLeb128(&current_data_));
handler_.address_ = DecodeUnsignedLeb128(&current_data_);
remaining_count_--;
return;
}
if (catch_all_) {
handler_.type_idx_ = dex::TypeIndex(DexFile::kDexNoIndex16);
handler_.address_ = DecodeUnsignedLeb128(&current_data_);
catch_all_ = false;
return;
}
// no more handler
remaining_count_ = -1;
}
namespace dex {
std::ostream& operator<<(std::ostream& os, const StringIndex& index) {
os << "StringIndex[" << index.index_ << "]";
return os;
}
std::ostream& operator<<(std::ostream& os, const TypeIndex& index) {
os << "TypeIndex[" << index.index_ << "]";
return os;
}
} // namespace dex
} // namespace art
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