| // Copyright 2011 Google Inc. All Rights Reserved. |
| |
| #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> |
| #include <sys/stat.h> |
| |
| #include <map> |
| |
| #include "UniquePtr.h" |
| #include "class_linker.h" |
| #include "globals.h" |
| #include "leb128.h" |
| #include "logging.h" |
| #include "object.h" |
| #include "os.h" |
| #include "stringprintf.h" |
| #include "thread.h" |
| #include "utf.h" |
| #include "utils.h" |
| #include "zip_archive.h" |
| |
| namespace art { |
| |
| const byte DexFile::kDexMagic[] = { 'd', 'e', 'x', '\n' }; |
| const byte DexFile::kDexMagicVersion[] = { '0', '3', '5', '\0' }; |
| |
| DexFile::ClassPathEntry DexFile::FindInClassPath(const StringPiece& descriptor, |
| const ClassPath& class_path) { |
| for (size_t i = 0; i != class_path.size(); ++i) { |
| const DexFile* dex_file = class_path[i]; |
| const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); |
| if (dex_class_def != NULL) { |
| return ClassPathEntry(dex_file, dex_class_def); |
| } |
| } |
| // TODO: remove reinterpret_cast when issue with -std=gnu++0x host issue resolved |
| return ClassPathEntry(reinterpret_cast<const DexFile*>(NULL), |
| reinterpret_cast<const DexFile::ClassDef*>(NULL)); |
| } |
| |
| void DexFile::OpenDexFiles(std::vector<const char*>& dex_filenames, |
| std::vector<const DexFile*>& dex_files, |
| const std::string& strip_location_prefix) { |
| for (size_t i = 0; i < dex_filenames.size(); i++) { |
| const char* dex_filename = dex_filenames[i]; |
| const DexFile* dex_file = Open(dex_filename, strip_location_prefix); |
| if (dex_file == NULL) { |
| fprintf(stderr, "could not open .dex from file %s\n", dex_filename); |
| exit(EXIT_FAILURE); |
| } |
| dex_files.push_back(dex_file); |
| } |
| } |
| |
| const DexFile* DexFile::Open(const std::string& filename, |
| const std::string& strip_location_prefix) { |
| if (IsValidZipFilename(filename)) { |
| return DexFile::OpenZip(filename, strip_location_prefix); |
| } |
| if (!IsValidDexFilename(filename)) { |
| LOG(WARNING) << "Attempting to open dex file with unknown extension '" << filename << "'"; |
| } |
| return DexFile::OpenFile(filename, filename, strip_location_prefix); |
| } |
| |
| void DexFile::ChangePermissions(int prot) const { |
| if (mprotect(mem_map_->GetAddress(), mem_map_->GetLength(), prot) != 0) { |
| PLOG(FATAL) << "Failed to change dex file permissions to " << prot; |
| } |
| } |
| |
| const DexFile* DexFile::OpenFile(const std::string& filename, |
| const std::string& original_location, |
| const std::string& strip_location_prefix) { |
| StringPiece location = original_location; |
| if (!location.starts_with(strip_location_prefix)) { |
| LOG(ERROR) << filename << " does not start with " << strip_location_prefix; |
| return NULL; |
| } |
| location.remove_prefix(strip_location_prefix.size()); |
| int fd = open(filename.c_str(), O_RDONLY); // TODO: scoped_fd |
| if (fd == -1) { |
| PLOG(ERROR) << "open(\"" << filename << "\", O_RDONLY) failed"; |
| return NULL; |
| } |
| struct stat sbuf; |
| memset(&sbuf, 0, sizeof(sbuf)); |
| if (fstat(fd, &sbuf) == -1) { |
| PLOG(ERROR) << "fstat \"" << filename << "\" failed"; |
| close(fd); |
| return NULL; |
| } |
| size_t length = sbuf.st_size; |
| UniquePtr<MemMap> map(MemMap::Map(length, PROT_READ, MAP_PRIVATE, fd, 0)); |
| if (map.get() == NULL) { |
| LOG(ERROR) << "mmap \"" << filename << "\" failed"; |
| close(fd); |
| return NULL; |
| } |
| close(fd); |
| byte* dex_file = map->GetAddress(); |
| return OpenMemory(dex_file, length, location.ToString(), map.release()); |
| } |
| |
| const char* DexFile::kClassesDex = "classes.dex"; |
| |
| class LockedFd { |
| public: |
| static LockedFd* CreateAndLock(std::string& name, mode_t mode) { |
| int fd = open(name.c_str(), O_CREAT | O_RDWR, mode); |
| if (fd == -1) { |
| PLOG(ERROR) << "Failed to open file '" << name << "'"; |
| return NULL; |
| } |
| fchmod(fd, mode); |
| |
| LOG(INFO) << "locking file " << name << " (fd=" << fd << ")"; |
| int result = flock(fd, LOCK_EX | LOCK_NB); |
| if (result == -1) { |
| LOG(WARNING) << "sleeping while locking file " << name; |
| result = flock(fd, LOCK_EX); |
| } |
| if (result == -1) { |
| PLOG(ERROR) << "Failed to lock file '" << name << "'"; |
| close(fd); |
| return NULL; |
| } |
| return new LockedFd(fd); |
| } |
| |
| int GetFd() const { |
| return fd_; |
| } |
| |
| ~LockedFd() { |
| if (fd_ != -1) { |
| int result = flock(fd_, LOCK_UN); |
| if (result == -1) { |
| PLOG(WARNING) << "flock(" << fd_ << ", LOCK_UN) failed"; |
| } |
| close(fd_); |
| } |
| } |
| |
| private: |
| explicit LockedFd(int fd) : fd_(fd) {} |
| |
| int fd_; |
| }; |
| |
| class TmpFile { |
| public: |
| explicit TmpFile(const std::string& name) : name_(name) {} |
| ~TmpFile() { |
| unlink(name_.c_str()); |
| } |
| private: |
| const std::string name_; |
| }; |
| |
| // Open classes.dex from within a .zip, .jar, .apk, ... |
| const DexFile* DexFile::OpenZip(const std::string& filename, |
| const std::string& strip_location_prefix) { |
| // First, look for a ".dex" alongside the jar file. It will have |
| // the same name/path except for the extension. |
| |
| // Example filename = dir/foo.jar |
| std::string adjacent_dex_filename(filename); |
| size_t found = adjacent_dex_filename.find_last_of("."); |
| if (found == std::string::npos) { |
| LOG(ERROR) << "No . in filename" << filename; |
| return NULL; |
| } |
| adjacent_dex_filename.replace(adjacent_dex_filename.begin() + found, |
| adjacent_dex_filename.end(), |
| ".dex"); |
| // Example adjacent_dex_filename = dir/foo.dex |
| if (OS::FileExists(adjacent_dex_filename.c_str())) { |
| const DexFile* adjacent_dex_file = DexFile::OpenFile(adjacent_dex_filename, |
| filename, |
| strip_location_prefix); |
| if (adjacent_dex_file != NULL) { |
| // We don't verify anything in this case, because we aren't in |
| // the cache and typically the file is in the readonly /system |
| // area, so if something is wrong, there is nothing we can do. |
| return adjacent_dex_file; |
| } |
| return NULL; |
| } |
| |
| UniquePtr<char[]> resolved(new char[PATH_MAX]); |
| char* absolute_path = realpath(filename.c_str(), resolved.get()); |
| if (absolute_path == NULL) { |
| LOG(ERROR) << "Failed to create absolute path for " << filename |
| << " when looking for classes.dex"; |
| return NULL; |
| } |
| std::string cache_path_tmp(GetArtCacheFilenameOrDie(absolute_path)); |
| cache_path_tmp.push_back('@'); |
| cache_path_tmp.append(kClassesDex); |
| // Example cache_path_tmp = /data/art-cache/parent@dir@foo.jar@classes.dex |
| |
| UniquePtr<ZipArchive> zip_archive(ZipArchive::Open(filename)); |
| if (zip_archive.get() == NULL) { |
| LOG(ERROR) << "Failed to open " << filename << " when looking for classes.dex"; |
| return NULL; |
| } |
| UniquePtr<ZipEntry> zip_entry(zip_archive->Find(kClassesDex)); |
| if (zip_entry.get() == NULL) { |
| LOG(ERROR) << "Failed to find classes.dex within " << filename; |
| return NULL; |
| } |
| |
| std::string cache_path = StringPrintf("%s.%08x", cache_path_tmp.c_str(), zip_entry->GetCrc32()); |
| // Example cache_path = /data/art-cache/parent@dir@foo.jar@classes.dex.1a2b3c4d |
| |
| while (true) { |
| if (OS::FileExists(cache_path.c_str())) { |
| const DexFile* cached_dex_file = DexFile::OpenFile(cache_path, |
| filename, |
| strip_location_prefix); |
| if (cached_dex_file != NULL) { |
| return cached_dex_file; |
| } |
| } |
| |
| // Try to open the temporary cache file, grabbing an exclusive |
| // lock. If somebody else is working on it, we'll block here until |
| // they complete. Because we're waiting on an external resource, |
| // we go into native mode. |
| // Note that self can be NULL if we're parsing the bootclasspath |
| // during JNI_CreateJavaVM. |
| Thread* self = Thread::Current(); |
| UniquePtr<ScopedThreadStateChange> state_changer; |
| if (self != NULL) { |
| state_changer.reset(new ScopedThreadStateChange(self, Thread::kNative)); |
| } |
| UniquePtr<LockedFd> fd(LockedFd::CreateAndLock(cache_path_tmp, 0644)); |
| state_changer.reset(NULL); |
| if (fd.get() == NULL) { |
| PLOG(ERROR) << "Failed to lock file '" << cache_path_tmp << "'"; |
| return NULL; |
| } |
| |
| // Check to see if the fd we opened and locked matches the file in |
| // the filesystem. If they don't, then somebody else unlinked |
| // ours and created a new file, and we need to use that one |
| // instead. (If we caught them between the unlink and the create, |
| // we'll get an ENOENT from the file stat.) |
| struct stat fd_stat; |
| int fd_stat_result = fstat(fd->GetFd(), &fd_stat); |
| if (fd_stat_result == -1) { |
| PLOG(ERROR) << "Failed to stat open file '" << cache_path_tmp << "'"; |
| return NULL; |
| } |
| struct stat file_stat; |
| int file_stat_result = stat(cache_path_tmp.c_str(), &file_stat); |
| if (file_stat_result == -1 || |
| fd_stat.st_dev != file_stat.st_dev || fd_stat.st_ino != file_stat.st_ino) { |
| LOG(WARNING) << "our open cache file is stale; sleeping and retrying"; |
| usleep(250 * 1000); // if something is hosed, don't peg machine |
| continue; |
| } |
| |
| // We have the correct file open and locked. Extract classes.dex |
| TmpFile tmp_file(cache_path_tmp); |
| UniquePtr<File> file(OS::FileFromFd(cache_path_tmp.c_str(), fd->GetFd())); |
| if (file.get() == NULL) { |
| LOG(ERROR) << "Failed to create file for '" << cache_path_tmp << "'"; |
| return NULL; |
| } |
| bool success = zip_entry->Extract(*file); |
| if (!success) { |
| LOG(ERROR) << "Failed to extract classes.dex to '" << cache_path_tmp << "'"; |
| return NULL; |
| } |
| |
| // TODO: restat and check length against zip_entry->GetUncompressedLength()? |
| |
| // Compute checksum and compare to zip. If things look okay, rename from tmp. |
| off_t lseek_result = lseek(fd->GetFd(), 0, SEEK_SET); |
| if (lseek_result == -1) { |
| PLOG(ERROR) << "Failed to seek to start of '" << cache_path_tmp << "'"; |
| return NULL; |
| } |
| const size_t kBufSize = 32768; |
| UniquePtr<uint8_t[]> buf(new uint8_t[kBufSize]); |
| if (buf.get() == NULL) { |
| LOG(ERROR) << "Failed to allocate buffer to checksum '" << cache_path_tmp << "'"; |
| return NULL; |
| } |
| uint32_t computed_crc = crc32(0L, Z_NULL, 0); |
| while (true) { |
| ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd->GetFd(), buf.get(), kBufSize)); |
| if (bytes_read == -1) { |
| PLOG(ERROR) << "Problem computing CRC of '" << cache_path_tmp << "'"; |
| return NULL; |
| } |
| if (bytes_read == 0) { |
| break; |
| } |
| computed_crc = crc32(computed_crc, buf.get(), bytes_read); |
| } |
| if (computed_crc != zip_entry->GetCrc32()) { |
| LOG(ERROR) << "Failed to validate checksum for '" << cache_path_tmp << "'"; |
| return NULL; |
| } |
| int rename_result = rename(cache_path_tmp.c_str(), cache_path.c_str()); |
| if (rename_result == -1) { |
| PLOG(ERROR) << "Failed to install dex cache file '" << cache_path << "'" |
| << " from '" << cache_path_tmp << "'"; |
| unlink(cache_path.c_str()); |
| } |
| } |
| // NOTREACHED |
| } |
| |
| const DexFile* DexFile::OpenMemory(const byte* dex_bytes, size_t length, |
| const std::string& location, MemMap* mem_map) { |
| UniquePtr<DexFile> dex_file(new DexFile(dex_bytes, length, location, mem_map)); |
| if (!dex_file->Init()) { |
| return NULL; |
| } else { |
| return dex_file.release(); |
| } |
| } |
| |
| 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! |
| } |
| |
| jobject DexFile::GetDexObject(JNIEnv* env) const { |
| MutexLock mu(dex_object_lock_); |
| if (dex_object_ != NULL) { |
| return dex_object_; |
| } |
| |
| void* address = const_cast<void*>(reinterpret_cast<const void*>(base_)); |
| jobject byte_buffer = env->NewDirectByteBuffer(address, length_); |
| if (byte_buffer == NULL) { |
| return NULL; |
| } |
| |
| jclass c = env->FindClass("com/android/dex/Dex"); |
| if (c == NULL) { |
| return NULL; |
| } |
| |
| jmethodID mid = env->GetStaticMethodID(c, "create", "(Ljava/nio/ByteBuffer;)Lcom/android/dex/Dex;"); |
| if (mid == NULL) { |
| return NULL; |
| } |
| |
| jvalue args[1]; |
| args[0].l = byte_buffer; |
| jobject local = env->CallStaticObjectMethodA(c, mid, args); |
| if (local == NULL) { |
| return NULL; |
| } |
| |
| dex_object_ = env->NewGlobalRef(local); |
| return dex_object_; |
| } |
| |
| bool DexFile::Init() { |
| InitMembers(); |
| if (!IsMagicValid()) { |
| return false; |
| } |
| InitIndex(); |
| return true; |
| } |
| |
| void DexFile::InitMembers() { |
| const byte* b = base_; |
| header_ = reinterpret_cast<const Header*>(b); |
| const Header* h = header_; |
| string_ids_ = reinterpret_cast<const StringId*>(b + h->string_ids_off_); |
| type_ids_ = reinterpret_cast<const TypeId*>(b + h->type_ids_off_); |
| field_ids_ = reinterpret_cast<const FieldId*>(b + h->field_ids_off_); |
| method_ids_ = reinterpret_cast<const MethodId*>(b + h->method_ids_off_); |
| proto_ids_ = reinterpret_cast<const ProtoId*>(b + h->proto_ids_off_); |
| class_defs_ = reinterpret_cast<const ClassDef*>(b + h->class_defs_off_); |
| } |
| |
| bool DexFile::IsMagicValid() { |
| return CheckMagic(header_->magic_); |
| } |
| |
| bool DexFile::CheckMagic(const byte* magic) { |
| CHECK(magic != NULL); |
| if (memcmp(magic, kDexMagic, sizeof(kDexMagic)) != 0) { |
| LOG(ERROR) << "Unrecognized magic number:" |
| << " " << magic[0] |
| << " " << magic[1] |
| << " " << magic[2] |
| << " " << magic[3]; |
| return false; |
| } |
| const byte* version = &magic[sizeof(kDexMagic)]; |
| if (memcmp(version, kDexMagicVersion, sizeof(kDexMagicVersion)) != 0) { |
| LOG(ERROR) << "Unrecognized version number:" |
| << " " << version[0] |
| << " " << version[1] |
| << " " << version[2] |
| << " " << version[3]; |
| return false; |
| } |
| return true; |
| } |
| |
| uint32_t DexFile::GetVersion() const { |
| const char* version = reinterpret_cast<const char*>(&GetHeader().magic_[sizeof(kDexMagic)]); |
| return atoi(version); |
| } |
| |
| int32_t DexFile::GetStringLength(const StringId& string_id) const { |
| const byte* ptr = base_ + string_id.string_data_off_; |
| return DecodeUnsignedLeb128(&ptr); |
| } |
| |
| // Returns a pointer to the UTF-8 string data referred to by the given string_id. |
| const char* DexFile::GetStringDataAndLength(const StringId& string_id, int32_t* length) const { |
| CHECK(length != NULL); |
| const byte* ptr = base_ + string_id.string_data_off_; |
| *length = DecodeUnsignedLeb128(&ptr); |
| return reinterpret_cast<const char*>(ptr); |
| } |
| |
| void DexFile::InitIndex() { |
| CHECK_EQ(index_.size(), 0U); |
| for (size_t i = 0; i < NumClassDefs(); ++i) { |
| const ClassDef& class_def = GetClassDef(i); |
| const char* descriptor = GetClassDescriptor(class_def); |
| index_[descriptor] = i; |
| } |
| } |
| |
| bool DexFile::FindClassDefIndex(const StringPiece& descriptor, uint32_t& idx) const { |
| Index::const_iterator it = index_.find(descriptor); |
| if (it == index_.end()) { |
| return false; |
| } |
| idx = it->second; |
| return true; |
| } |
| |
| const DexFile::ClassDef* DexFile::FindClassDef(const StringPiece& descriptor) const { |
| uint32_t idx; |
| if (FindClassDefIndex(descriptor, idx)) { |
| return &GetClassDef(idx); |
| } |
| return NULL; |
| } |
| |
| const DexFile::MethodId* DexFile::FindMethodId(const DexFile::TypeId& 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 uint16_t class_idx = GetIndexForTypeId(klass); |
| const uint32_t name_idx = GetIndexForStringId(name); |
| const uint16_t proto_idx = GetIndexForProtoId(signature); |
| uint32_t lo = 0; |
| uint32_t hi = NumMethodIds() - 1; |
| while (hi >= lo) { |
| uint32_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 NULL; |
| } |
| |
| const DexFile::StringId* DexFile::FindStringId(const std::string& string) const { |
| uint32_t lo = 0; |
| uint32_t hi = NumStringIds() - 1; |
| while (hi >= lo) { |
| uint32_t mid = (hi + lo) / 2; |
| int32_t length; |
| const DexFile::StringId& str_id = GetStringId(mid); |
| const char* str = GetStringDataAndLength(str_id, &length); |
| int compare = CompareModifiedUtf8ToModifiedUtf8AsUtf16CodePointValues(string.c_str(), str); |
| if (compare > 0) { |
| lo = mid + 1; |
| } else if (compare < 0) { |
| hi = mid - 1; |
| } else { |
| return &str_id; |
| } |
| } |
| return NULL; |
| } |
| |
| const DexFile::TypeId* DexFile::FindTypeId(uint32_t string_idx) const { |
| uint32_t lo = 0; |
| uint32_t hi = NumTypeIds() - 1; |
| while (hi >= lo) { |
| uint32_t mid = (hi + lo) / 2; |
| const TypeId& type_id = GetTypeId(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 NULL; |
| } |
| |
| const DexFile::ProtoId* DexFile::FindProtoId(uint16_t return_type_idx, |
| const std::vector<uint16_t>& signature_type_ids) const { |
| uint32_t lo = 0; |
| uint32_t hi = NumProtoIds() - 1; |
| while (hi >= lo) { |
| uint32_t mid = (hi + lo) / 2; |
| const DexFile::ProtoId& proto = GetProtoId(mid); |
| int compare = return_type_idx - proto.return_type_idx_; |
| if (compare == 0) { |
| DexFileParameterIterator it(*this, proto); |
| size_t i = 0; |
| while (it.HasNext() && i < signature_type_ids.size() && compare == 0) { |
| compare = signature_type_ids[i] - it.GetTypeId(); |
| it.Next(); |
| i++; |
| } |
| if (compare == 0) { |
| if (it.HasNext()) { |
| compare = -1; |
| } else if (i < signature_type_ids.size()) { |
| compare = 1; |
| } |
| } |
| } |
| if (compare > 0) { |
| lo = mid + 1; |
| } else if (compare < 0) { |
| hi = mid - 1; |
| } else { |
| return &proto; |
| } |
| } |
| return NULL; |
| } |
| |
| // Given a signature place the type ids into the given vector |
| bool DexFile::CreateTypeList(uint16_t* return_type_idx, std::vector<uint16_t>* param_type_idxs, |
| const std::string& signature) const { |
| if (signature[0] != '(') { |
| return false; |
| } |
| size_t offset = 1; |
| size_t end = signature.size(); |
| bool process_return = false; |
| while (offset < end) { |
| char c = signature[offset]; |
| offset++; |
| if (c == ')') { |
| process_return = true; |
| continue; |
| } |
| std::string descriptor; |
| descriptor += c; |
| while (c == '[') { // process array prefix |
| if (offset >= end) { // expect some descriptor following [ |
| return false; |
| } |
| c = signature[offset]; |
| offset++; |
| descriptor += c; |
| } |
| if (c == 'L') { // process type descriptors |
| do { |
| if (offset >= end) { // unexpected early termination of descriptor |
| return false; |
| } |
| c = signature[offset]; |
| offset++; |
| descriptor += c; |
| } while (c != ';'); |
| } |
| const DexFile::StringId* string_id = FindStringId(descriptor); |
| if (string_id == NULL) { |
| return false; |
| } |
| const DexFile::TypeId* type_id = FindTypeId(GetIndexForStringId(*string_id)); |
| if (type_id == NULL) { |
| return false; |
| } |
| uint16_t 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 |
| } |
| |
| // Materializes the method descriptor for a method prototype. Method |
| // descriptors are not stored directly in the dex file. Instead, one |
| // must assemble the descriptor from references in the prototype. |
| std::string DexFile::CreateMethodSignature(uint32_t proto_idx, int32_t* unicode_length) const { |
| const ProtoId& proto_id = GetProtoId(proto_idx); |
| std::string descriptor; |
| descriptor.push_back('('); |
| const TypeList* type_list = GetProtoParameters(proto_id); |
| size_t parameter_length = 0; |
| if (type_list != NULL) { |
| // A non-zero number of arguments. Append the type names. |
| for (size_t i = 0; i < type_list->Size(); ++i) { |
| const TypeItem& type_item = type_list->GetTypeItem(i); |
| uint32_t type_idx = type_item.type_idx_; |
| int32_t type_length; |
| const char* name = StringByTypeIdx(type_idx, &type_length); |
| parameter_length += type_length; |
| descriptor.append(name); |
| } |
| } |
| descriptor.push_back(')'); |
| uint32_t return_type_idx = proto_id.return_type_idx_; |
| int32_t return_type_length; |
| const char* name = StringByTypeIdx(return_type_idx, &return_type_length); |
| descriptor.append(name); |
| if (unicode_length != NULL) { |
| *unicode_length = parameter_length + return_type_length + 2; // 2 for ( and ) |
| } |
| return descriptor; |
| } |
| |
| |
| int32_t DexFile::GetLineNumFromPC(const art::Method* method, uint32_t rel_pc) const { |
| // For native method, lineno should be -2 to indicate it is native. Note that |
| // "line number == -2" is how libcore tells from StackTraceElement. |
| if (method->GetCodeItemOffset() == 0) { |
| return -2; |
| } |
| |
| const CodeItem* code_item = GetCodeItem(method->GetCodeItemOffset()); |
| DCHECK(code_item != NULL); |
| |
| // A method with no line number info should return -1 |
| LineNumFromPcContext context(rel_pc, -1); |
| DecodeDebugInfo(code_item, method, LineNumForPcCb, NULL, &context); |
| return context.line_num_; |
| } |
| |
| int32_t DexFile::FindCatchHandlerOffset(const CodeItem &code_item, int32_t tries_size, |
| uint32_t address){ |
| // Note: Signed type is important for max and min. |
| int32_t min = 0; |
| int32_t max = tries_size - 1; |
| |
| while (max >= min) { |
| int32_t mid = (min + max) / 2; |
| const TryItem* pTry = DexFile::GetTryItems(code_item, mid); |
| uint32_t start = pTry->start_addr_; |
| if (address < start) { |
| max = mid - 1; |
| } else { |
| uint32_t end = start + pTry->insn_count_; |
| if (address >= end) { |
| min = mid + 1; |
| } else { // We have a winner! |
| return (int32_t) pTry->handler_off_; |
| } |
| } |
| } |
| // No match. |
| return -1; |
| } |
| |
| void DexFile::DecodeDebugInfo0(const CodeItem* code_item, const Method* method, |
| DexDebugNewPositionCb posCb, DexDebugNewLocalCb local_cb, |
| void* cnxt, const byte* stream, LocalInfo* local_in_reg) const { |
| uint32_t line = DecodeUnsignedLeb128(&stream); |
| uint32_t parameters_size = DecodeUnsignedLeb128(&stream); |
| uint16_t arg_reg = code_item->registers_size_ - code_item->ins_size_; |
| uint32_t address = 0; |
| bool need_locals = (local_cb != NULL); |
| |
| if (!method->IsStatic()) { |
| if (need_locals) { |
| std::string descriptor = method->GetDeclaringClass()->GetDescriptor()->ToModifiedUtf8(); |
| const ClassDef* class_def = FindClassDef(descriptor); |
| CHECK(class_def != NULL) << descriptor; |
| local_in_reg[arg_reg].name_ = "this"; |
| local_in_reg[arg_reg].descriptor_ = GetClassDescriptor(*class_def); |
| local_in_reg[arg_reg].start_address_ = 0; |
| local_in_reg[arg_reg].is_live_ = true; |
| } |
| arg_reg++; |
| } |
| |
| DexFileParameterIterator it(*this, GetProtoId(method->GetProtoIdx())); |
| for (uint32_t 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_ << ")"; |
| return; |
| } |
| int32_t id = DecodeUnsignedLeb128P1(&stream); |
| const char* descriptor = it.GetDescriptor(); |
| if (need_locals) { |
| const char* name = StringDataByIdx(id); |
| local_in_reg[arg_reg].name_ = name; |
| local_in_reg[arg_reg].descriptor_ = descriptor; |
| local_in_reg[arg_reg].start_address_ = address; |
| local_in_reg[arg_reg].is_live_ = true; |
| } |
| switch (*descriptor) { |
| case 'D': |
| case 'J': |
| arg_reg += 2; |
| break; |
| default: |
| arg_reg += 1; |
| break; |
| } |
| } |
| |
| if (it.HasNext()) { |
| LOG(ERROR) << "invalid stream - problem with parameter iterator"; |
| return; |
| } |
| |
| for (;;) { |
| uint8_t opcode = *stream++; |
| uint16_t reg; |
| uint16_t name_idx; |
| uint16_t descriptor_idx; |
| uint16_t signature_idx = 0; |
| |
| switch (opcode) { |
| case DBG_END_SEQUENCE: |
| return; |
| |
| case DBG_ADVANCE_PC: |
| address += DecodeUnsignedLeb128(&stream); |
| break; |
| |
| case DBG_ADVANCE_LINE: |
| line += DecodeSignedLeb128(&stream); |
| break; |
| |
| case DBG_START_LOCAL: |
| case DBG_START_LOCAL_EXTENDED: |
| reg = DecodeUnsignedLeb128(&stream); |
| if (reg > code_item->registers_size_) { |
| LOG(ERROR) << "invalid stream - reg > reg size (" << reg << " > " |
| << code_item->registers_size_ << ")"; |
| return; |
| } |
| |
| name_idx = DecodeUnsignedLeb128P1(&stream); |
| descriptor_idx = DecodeUnsignedLeb128P1(&stream); |
| if (opcode == DBG_START_LOCAL_EXTENDED) { |
| signature_idx = DecodeUnsignedLeb128P1(&stream); |
| } |
| |
| // Emit what was previously there, if anything |
| if (need_locals) { |
| InvokeLocalCbIfLive(cnxt, reg, address, local_in_reg, local_cb); |
| |
| local_in_reg[reg].name_ = StringDataByIdx(name_idx); |
| local_in_reg[reg].descriptor_ = StringByTypeIdx(descriptor_idx); |
| if (opcode == DBG_START_LOCAL_EXTENDED) { |
| local_in_reg[reg].signature_ = StringDataByIdx(signature_idx); |
| } |
| local_in_reg[reg].start_address_ = address; |
| local_in_reg[reg].is_live_ = true; |
| } |
| break; |
| |
| case DBG_END_LOCAL: |
| reg = DecodeUnsignedLeb128(&stream); |
| if (reg > code_item->registers_size_) { |
| LOG(ERROR) << "invalid stream - reg > reg size (" << reg << " > " |
| << code_item->registers_size_ << ")"; |
| return; |
| } |
| |
| if (need_locals) { |
| InvokeLocalCbIfLive(cnxt, reg, address, local_in_reg, local_cb); |
| local_in_reg[reg].is_live_ = false; |
| } |
| break; |
| |
| case DBG_RESTART_LOCAL: |
| reg = DecodeUnsignedLeb128(&stream); |
| if (reg > code_item->registers_size_) { |
| LOG(ERROR) << "invalid stream - reg > reg size (" << reg << " > " |
| << code_item->registers_size_ << ")"; |
| return; |
| } |
| |
| if (need_locals) { |
| if (local_in_reg[reg].name_ == NULL || local_in_reg[reg].descriptor_ == NULL) { |
| LOG(ERROR) << "invalid stream - no name or descriptor"; |
| return; |
| } |
| |
| // 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: |
| case DBG_SET_FILE: |
| break; |
| |
| default: { |
| int adjopcode = opcode - DBG_FIRST_SPECIAL; |
| |
| address += adjopcode / DBG_LINE_RANGE; |
| line += DBG_LINE_BASE + (adjopcode % DBG_LINE_RANGE); |
| |
| if (posCb != NULL) { |
| if (posCb(cnxt, address, line)) { |
| // early exit |
| return; |
| } |
| } |
| break; |
| } |
| } |
| } |
| } |
| |
| void DexFile::DecodeDebugInfo(const CodeItem* code_item, const art::Method* method, |
| DexDebugNewPositionCb posCb, DexDebugNewLocalCb local_cb, |
| void* cnxt) const { |
| const byte* stream = GetDebugInfoStream(code_item); |
| LocalInfo local_in_reg[code_item->registers_size_]; |
| |
| if (stream != NULL) { |
| DecodeDebugInfo0(code_item, method, posCb, local_cb, cnxt, stream, local_in_reg); |
| } |
| for (int reg = 0; reg < code_item->registers_size_; reg++) { |
| InvokeLocalCbIfLive(cnxt, reg, code_item->insns_size_in_code_units_, local_in_reg, local_cb); |
| } |
| } |
| |
| bool DexFile::LineNumForPcCb(void* cnxt, uint32_t address, uint32_t line_num) { |
| LineNumFromPcContext* context = (LineNumFromPcContext*) cnxt; |
| |
| // 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 (address > context->address_) { |
| // The line number from the previous positions callback |
| // wil be the final result. |
| return true; |
| } else { |
| context->line_num_ = line_num; |
| return address == context->address_; |
| } |
| } |
| |
| // Decodes the header section from the class data bytes. |
| void ClassDataItemIterator::ReadClassDataHeader() { |
| CHECK(ptr_pos_ != NULL); |
| 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_); |
| } |
| |
| void ClassDataItemIterator::ReadClassDataMethod() { |
| method_.method_idx_delta_ = DecodeUnsignedLeb128(&ptr_pos_); |
| method_.access_flags_ = DecodeUnsignedLeb128(&ptr_pos_); |
| method_.code_off_ = DecodeUnsignedLeb128(&ptr_pos_); |
| } |
| |
| // Read a signed integer. "zwidth" is the zero-based byte count. |
| static int32_t ReadSignedInt(const byte* 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. |
| static uint32_t ReadUnsignedInt(const byte* ptr, int zwidth, bool fill_on_right) { |
| uint32_t val = 0; |
| if (!fill_on_right) { |
| for (int i = zwidth; i >= 0; --i) { |
| val = (val >> 8) | (((uint32_t)*ptr++) << 24); |
| } |
| val >>= (3 - zwidth) * 8; |
| } else { |
| for (int i = zwidth; i >= 0; --i) { |
| val = (val >> 8) | (((uint32_t)*ptr++) << 24); |
| } |
| } |
| return val; |
| } |
| |
| // Read a signed long. "zwidth" is the zero-based byte count. |
| static int64_t ReadSignedLong(const byte* 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. |
| static uint64_t ReadUnsignedLong(const byte* ptr, int zwidth, bool fill_on_right) { |
| uint64_t val = 0; |
| if (!fill_on_right) { |
| for (int i = zwidth; i >= 0; --i) { |
| val = (val >> 8) | (((uint64_t)*ptr++) << 56); |
| } |
| val >>= (7 - zwidth) * 8; |
| } else { |
| for (int i = zwidth; i >= 0; --i) { |
| val = (val >> 8) | (((uint64_t)*ptr++) << 56); |
| } |
| } |
| return val; |
| } |
| |
| EncodedStaticFieldValueIterator::EncodedStaticFieldValueIterator(const DexFile& dex_file, |
| DexCache* dex_cache, ClassLinker* linker, const DexFile::ClassDef& class_def) : |
| dex_file_(dex_file), dex_cache_(dex_cache), linker_(linker), array_size_(), pos_(-1), type_(0) { |
| ptr_ = dex_file.GetEncodedStaticFieldValuesArray(class_def); |
| if (ptr_ == NULL) { |
| array_size_ = 0; |
| } else { |
| array_size_ = DecodeUnsignedLeb128(&ptr_); |
| } |
| if (array_size_ > 0) { |
| Next(); |
| } |
| } |
| |
| void EncodedStaticFieldValueIterator::Next() { |
| pos_++; |
| if (pos_ >= array_size_) { |
| return; |
| } |
| byte value_type = *ptr_++; |
| byte value_arg = value_type >> kEncodedValueArgShift; |
| size_t width = value_arg + 1; // assume and correct later |
| type_ = value_type & kEncodedValueTypeMask; |
| switch (type_) { |
| case kBoolean: |
| jval_.i = (value_arg != 0) ? 1 : 0; |
| width = 0; |
| break; |
| case kByte: |
| jval_.i = ReadSignedInt(ptr_, value_arg); |
| CHECK(IsInt(8, jval_.i)); |
| break; |
| case kShort: |
| jval_.i = ReadSignedInt(ptr_, value_arg); |
| CHECK(IsInt(16, jval_.i)); |
| break; |
| case kChar: |
| jval_.i = ReadUnsignedInt(ptr_, value_arg, false); |
| CHECK(IsUint(16, jval_.i)); |
| break; |
| case kInt: |
| jval_.i = ReadSignedInt(ptr_, value_arg); |
| break; |
| case kLong: |
| jval_.j = ReadSignedLong(ptr_, value_arg); |
| break; |
| case kFloat: |
| jval_.i = ReadUnsignedInt(ptr_, value_arg, true); |
| break; |
| case kDouble: |
| jval_.j = ReadUnsignedLong(ptr_, value_arg, true); |
| break; |
| case kString: |
| case kType: |
| case kMethod: |
| case kEnum: |
| jval_.i = ReadUnsignedInt(ptr_, value_arg, false); |
| break; |
| case kField: |
| case kArray: |
| case kAnnotation: |
| UNIMPLEMENTED(FATAL) << ": type " << type_; |
| break; |
| case kNull: |
| jval_.l = NULL; |
| width = 0; |
| break; |
| default: |
| LOG(FATAL) << "Unreached"; |
| } |
| ptr_ += width; |
| } |
| |
| void EncodedStaticFieldValueIterator::ReadValueToField(Field* field) const { |
| switch (type_) { |
| case kBoolean: field->SetBoolean(NULL, jval_.z); break; |
| case kByte: field->SetByte(NULL, jval_.b); break; |
| case kShort: field->SetShort(NULL, jval_.s); break; |
| case kChar: field->SetChar(NULL, jval_.c); break; |
| case kInt: field->SetInt(NULL, jval_.i); break; |
| case kLong: field->SetLong(NULL, jval_.j); break; |
| case kFloat: field->SetFloat(NULL, jval_.f); break; |
| case kDouble: field->SetDouble(NULL, jval_.d); break; |
| case kNull: field->SetObject(NULL, NULL); break; |
| case kString: { |
| String* resolved = linker_->ResolveString(dex_file_, jval_.i, dex_cache_); |
| field->SetObject(NULL, resolved); |
| break; |
| } |
| default: UNIMPLEMENTED(FATAL) << ": type " << type_; |
| } |
| } |
| |
| 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, code_item.tries_size_, address); |
| } |
| if (offset >= 0) { |
| const byte* handler_data = DexFile::GetCatchHandlerData(code_item, offset); |
| Init(handler_data); |
| } else { |
| // Not found, initialize as empty |
| current_data_ = NULL; |
| remaining_count_ = -1; |
| catch_all_ = false; |
| DCHECK(!HasNext()); |
| } |
| } |
| |
| void CatchHandlerIterator::Init(const byte* handler_data) { |
| current_data_ = handler_data; |
| remaining_count_ = DecodeSignedLeb128(¤t_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_ = DecodeUnsignedLeb128(¤t_data_); |
| handler_.address_ = DecodeUnsignedLeb128(¤t_data_); |
| remaining_count_--; |
| return; |
| } |
| |
| if (catch_all_) { |
| handler_.type_idx_ = DexFile::kDexNoIndex16; |
| handler_.address_ = DecodeUnsignedLeb128(¤t_data_); |
| catch_all_ = false; |
| return; |
| } |
| |
| // no more handler |
| remaining_count_ = -1; |
| } |
| |
| } // namespace art |
