dalvik_system_DexFile.cc revision 40c8141b48275afd1680b99878782848ab3a6761
1/* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "dalvik_system_DexFile.h" 18 19#include "base/logging.h" 20#include "base/stl_util.h" 21#include "base/stringprintf.h" 22#include "class_linker.h" 23#include "common_throws.h" 24#include "dex_file-inl.h" 25#include "jni_internal.h" 26#include "mirror/class_loader.h" 27#include "mirror/object-inl.h" 28#include "mirror/string.h" 29#include "oat_file_assistant.h" 30#include "os.h" 31#include "profiler.h" 32#include "runtime.h" 33#include "scoped_thread_state_change.h" 34#include "ScopedLocalRef.h" 35#include "ScopedUtfChars.h" 36#include "utils.h" 37#include "well_known_classes.h" 38#include "zip_archive.h" 39 40namespace art { 41 42static std::unique_ptr<std::vector<const DexFile*>> 43ConvertJavaArrayToNative(JNIEnv* env, jobject arrayObject) { 44 jarray array = reinterpret_cast<jarray>(arrayObject); 45 46 jsize array_size = env->GetArrayLength(array); 47 if (env->ExceptionCheck() == JNI_TRUE) { 48 return std::unique_ptr<std::vector<const DexFile*>>(); 49 } 50 51 // TODO: Optimize. On 32bit we can use an int array. 52 jboolean is_long_data_copied; 53 jlong* long_data = env->GetLongArrayElements(reinterpret_cast<jlongArray>(array), 54 &is_long_data_copied); 55 if (env->ExceptionCheck() == JNI_TRUE) { 56 return std::unique_ptr<std::vector<const DexFile*>>(); 57 } 58 59 std::unique_ptr<std::vector<const DexFile*>> ret(new std::vector<const DexFile*>()); 60 ret->reserve(array_size); 61 for (jsize i = 0; i < array_size; ++i) { 62 ret->push_back(reinterpret_cast<const DexFile*>(static_cast<uintptr_t>(*(long_data + i)))); 63 } 64 65 env->ReleaseLongArrayElements(reinterpret_cast<jlongArray>(array), long_data, JNI_ABORT); 66 if (env->ExceptionCheck() == JNI_TRUE) { 67 return std::unique_ptr<std::vector<const DexFile*>>(); 68 } 69 70 return ret; 71} 72 73static jlongArray ConvertNativeToJavaArray(JNIEnv* env, 74 std::vector<std::unique_ptr<const DexFile>>& vec) { 75 size_t vec_size = vec.size(); 76 jlongArray long_array = env->NewLongArray(static_cast<jsize>(vec_size)); 77 if (env->ExceptionCheck() == JNI_TRUE) { 78 return nullptr; 79 } 80 81 jboolean is_long_data_copied; 82 jlong* long_data = env->GetLongArrayElements(long_array, &is_long_data_copied); 83 if (env->ExceptionCheck() == JNI_TRUE) { 84 return nullptr; 85 } 86 87 jlong* tmp = long_data; 88 for (auto& dex_file : vec) { 89 *tmp = reinterpret_cast<uintptr_t>(dex_file.get()); 90 tmp++; 91 } 92 93 env->ReleaseLongArrayElements(long_array, long_data, 0); 94 if (env->ExceptionCheck() == JNI_TRUE) { 95 return nullptr; 96 } 97 98 // Now release all the unique_ptrs. 99 for (auto& dex_file : vec) { 100 dex_file.release(); 101 } 102 103 return long_array; 104} 105 106// A smart pointer that provides read-only access to a Java string's UTF chars. 107// Unlike libcore's NullableScopedUtfChars, this will *not* throw NullPointerException if 108// passed a null jstring. The correct idiom is: 109// 110// NullableScopedUtfChars name(env, javaName); 111// if (env->ExceptionCheck()) { 112// return null; 113// } 114// // ... use name.c_str() 115// 116// TODO: rewrite to get rid of this, or change ScopedUtfChars to offer this option. 117class NullableScopedUtfChars { 118 public: 119 NullableScopedUtfChars(JNIEnv* env, jstring s) : mEnv(env), mString(s) { 120 mUtfChars = (s != nullptr) ? env->GetStringUTFChars(s, nullptr) : nullptr; 121 } 122 123 ~NullableScopedUtfChars() { 124 if (mUtfChars) { 125 mEnv->ReleaseStringUTFChars(mString, mUtfChars); 126 } 127 } 128 129 const char* c_str() const { 130 return mUtfChars; 131 } 132 133 size_t size() const { 134 return strlen(mUtfChars); 135 } 136 137 // Element access. 138 const char& operator[](size_t n) const { 139 return mUtfChars[n]; 140 } 141 142 private: 143 JNIEnv* mEnv; 144 jstring mString; 145 const char* mUtfChars; 146 147 // Disallow copy and assignment. 148 NullableScopedUtfChars(const NullableScopedUtfChars&); 149 void operator=(const NullableScopedUtfChars&); 150}; 151 152static jobject DexFile_openDexFileNative( 153 JNIEnv* env, jclass, jstring javaSourceName, jstring javaOutputName, jint) { 154 ScopedUtfChars sourceName(env, javaSourceName); 155 if (sourceName.c_str() == nullptr) { 156 return 0; 157 } 158 NullableScopedUtfChars outputName(env, javaOutputName); 159 if (env->ExceptionCheck()) { 160 return 0; 161 } 162 163 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 164 std::vector<std::unique_ptr<const DexFile>> dex_files; 165 std::vector<std::string> error_msgs; 166 167 dex_files = linker->OpenDexFilesFromOat(sourceName.c_str(), outputName.c_str(), &error_msgs); 168 169 if (!dex_files.empty()) { 170 jlongArray array = ConvertNativeToJavaArray(env, dex_files); 171 if (array == nullptr) { 172 ScopedObjectAccess soa(env); 173 for (auto& dex_file : dex_files) { 174 if (Runtime::Current()->GetClassLinker()->IsDexFileRegistered(*dex_file)) { 175 dex_file.release(); 176 } 177 } 178 } 179 return array; 180 } else { 181 ScopedObjectAccess soa(env); 182 CHECK(!error_msgs.empty()); 183 // The most important message is at the end. So set up nesting by going forward, which will 184 // wrap the existing exception as a cause for the following one. 185 auto it = error_msgs.begin(); 186 auto itEnd = error_msgs.end(); 187 for ( ; it != itEnd; ++it) { 188 ThrowWrappedIOException("%s", it->c_str()); 189 } 190 191 return nullptr; 192 } 193} 194 195static void DexFile_closeDexFile(JNIEnv* env, jclass, jobject cookie) { 196 std::unique_ptr<std::vector<const DexFile*>> dex_files = ConvertJavaArrayToNative(env, cookie); 197 if (dex_files.get() == nullptr) { 198 DCHECK(env->ExceptionCheck()); 199 return; 200 } 201 202 ScopedObjectAccess soa(env); 203 204 // The Runtime currently never unloads classes, which means any registered 205 // dex files must be kept around forever in case they are used. We 206 // accomplish this here by explicitly leaking those dex files that are 207 // registered. 208 // 209 // TODO: The Runtime should support unloading of classes and freeing of the 210 // dex files for those unloaded classes rather than leaking dex files here. 211 for (auto& dex_file : *dex_files) { 212 if (!Runtime::Current()->GetClassLinker()->IsDexFileRegistered(*dex_file)) { 213 delete dex_file; 214 } 215 } 216} 217 218static jclass DexFile_defineClassNative(JNIEnv* env, jclass, jstring javaName, jobject javaLoader, 219 jobject cookie) { 220 std::unique_ptr<std::vector<const DexFile*>> dex_files = ConvertJavaArrayToNative(env, cookie); 221 if (dex_files.get() == nullptr) { 222 VLOG(class_linker) << "Failed to find dex_file"; 223 DCHECK(env->ExceptionCheck()); 224 return nullptr; 225 } 226 227 ScopedUtfChars class_name(env, javaName); 228 if (class_name.c_str() == nullptr) { 229 VLOG(class_linker) << "Failed to find class_name"; 230 return nullptr; 231 } 232 const std::string descriptor(DotToDescriptor(class_name.c_str())); 233 const size_t hash(ComputeModifiedUtf8Hash(descriptor.c_str())); 234 for (auto& dex_file : *dex_files) { 235 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor.c_str(), hash); 236 if (dex_class_def != nullptr) { 237 ScopedObjectAccess soa(env); 238 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 239 class_linker->RegisterDexFile(*dex_file); 240 StackHandleScope<1> hs(soa.Self()); 241 Handle<mirror::ClassLoader> class_loader( 242 hs.NewHandle(soa.Decode<mirror::ClassLoader*>(javaLoader))); 243 mirror::Class* result = class_linker->DefineClass(soa.Self(), descriptor.c_str(), hash, 244 class_loader, *dex_file, *dex_class_def); 245 if (result != nullptr) { 246 VLOG(class_linker) << "DexFile_defineClassNative returning " << result 247 << " for " << class_name.c_str(); 248 return soa.AddLocalReference<jclass>(result); 249 } 250 } 251 } 252 VLOG(class_linker) << "Failed to find dex_class_def " << class_name.c_str(); 253 return nullptr; 254} 255 256// Needed as a compare functor for sets of const char 257struct CharPointerComparator { 258 bool operator()(const char *str1, const char *str2) const { 259 return strcmp(str1, str2) < 0; 260 } 261}; 262 263// Note: this can be an expensive call, as we sort out duplicates in MultiDex files. 264static jobjectArray DexFile_getClassNameList(JNIEnv* env, jclass, jobject cookie) { 265 std::unique_ptr<std::vector<const DexFile*>> dex_files = ConvertJavaArrayToNative(env, cookie); 266 if (dex_files.get() == nullptr) { 267 DCHECK(env->ExceptionCheck()); 268 return nullptr; 269 } 270 271 // Push all class descriptors into a set. Use set instead of unordered_set as we want to 272 // retrieve all in the end. 273 std::set<const char*, CharPointerComparator> descriptors; 274 for (auto& dex_file : *dex_files) { 275 for (size_t i = 0; i < dex_file->NumClassDefs(); ++i) { 276 const DexFile::ClassDef& class_def = dex_file->GetClassDef(i); 277 const char* descriptor = dex_file->GetClassDescriptor(class_def); 278 descriptors.insert(descriptor); 279 } 280 } 281 282 // Now create output array and copy the set into it. 283 jobjectArray result = env->NewObjectArray(descriptors.size(), WellKnownClasses::java_lang_String, 284 nullptr); 285 if (result != nullptr) { 286 auto it = descriptors.begin(); 287 auto it_end = descriptors.end(); 288 jsize i = 0; 289 for (; it != it_end; it++, ++i) { 290 std::string descriptor(DescriptorToDot(*it)); 291 ScopedLocalRef<jstring> jdescriptor(env, env->NewStringUTF(descriptor.c_str())); 292 if (jdescriptor.get() == nullptr) { 293 return nullptr; 294 } 295 env->SetObjectArrayElement(result, i, jdescriptor.get()); 296 } 297 } 298 return result; 299} 300 301static jint GetDexOptNeeded(JNIEnv* env, const char* filename, 302 const char* pkgname, const char* instruction_set, const jboolean defer) { 303 304 if ((filename == nullptr) || !OS::FileExists(filename)) { 305 LOG(ERROR) << "DexFile_getDexOptNeeded file '" << filename << "' does not exist"; 306 ScopedLocalRef<jclass> fnfe(env, env->FindClass("java/io/FileNotFoundException")); 307 const char* message = (filename == nullptr) ? "<empty file name>" : filename; 308 env->ThrowNew(fnfe.get(), message); 309 return OatFileAssistant::kNoDexOptNeeded; 310 } 311 312 const InstructionSet target_instruction_set = GetInstructionSetFromString(instruction_set); 313 if (target_instruction_set == kNone) { 314 ScopedLocalRef<jclass> iae(env, env->FindClass("java/lang/IllegalArgumentException")); 315 std::string message(StringPrintf("Instruction set %s is invalid.", instruction_set)); 316 env->ThrowNew(iae.get(), message.c_str()); 317 return 0; 318 } 319 320 // TODO: Verify the dex location is well formed, and throw an IOException if 321 // not? 322 323 OatFileAssistant oat_file_assistant(filename, target_instruction_set, false, pkgname); 324 325 // Always treat elements of the bootclasspath as up-to-date. 326 if (oat_file_assistant.IsInBootClassPath()) { 327 return OatFileAssistant::kNoDexOptNeeded; 328 } 329 330 // TODO: Checking the profile should probably be done in the GetStatus() 331 // function. We have it here because GetStatus() should not be copying 332 // profile files. But who should be copying profile files? 333 if (oat_file_assistant.OdexFileIsOutOfDate()) { 334 // Needs recompile if profile has changed significantly. 335 if (Runtime::Current()->GetProfilerOptions().IsEnabled()) { 336 if (oat_file_assistant.IsProfileChangeSignificant()) { 337 if (!defer) { 338 oat_file_assistant.CopyProfileFile(); 339 } 340 return OatFileAssistant::kDex2OatNeeded; 341 } else if (oat_file_assistant.ProfileExists() 342 && !oat_file_assistant.OldProfileExists()) { 343 if (!defer) { 344 oat_file_assistant.CopyProfileFile(); 345 } 346 } 347 } 348 } 349 350 return oat_file_assistant.GetDexOptNeeded(); 351} 352 353static jint DexFile_getDexOptNeeded(JNIEnv* env, jclass, jstring javaFilename, 354 jstring javaPkgname, jstring javaInstructionSet, jboolean defer) { 355 ScopedUtfChars filename(env, javaFilename); 356 if (env->ExceptionCheck()) { 357 return 0; 358 } 359 360 NullableScopedUtfChars pkgname(env, javaPkgname); 361 362 ScopedUtfChars instruction_set(env, javaInstructionSet); 363 if (env->ExceptionCheck()) { 364 return 0; 365 } 366 367 return GetDexOptNeeded(env, filename.c_str(), pkgname.c_str(), 368 instruction_set.c_str(), defer); 369} 370 371// public API, null pkgname 372static jboolean DexFile_isDexOptNeeded(JNIEnv* env, jclass, jstring javaFilename) { 373 const char* instruction_set = GetInstructionSetString(kRuntimeISA); 374 ScopedUtfChars filename(env, javaFilename); 375 jint status = GetDexOptNeeded(env, filename.c_str(), nullptr /* pkgname */, 376 instruction_set, false /* defer */); 377 return (status != OatFileAssistant::kNoDexOptNeeded) ? JNI_TRUE : JNI_FALSE; 378} 379 380static JNINativeMethod gMethods[] = { 381 NATIVE_METHOD(DexFile, closeDexFile, "(Ljava/lang/Object;)V"), 382 NATIVE_METHOD(DexFile, defineClassNative, 383 "(Ljava/lang/String;Ljava/lang/ClassLoader;Ljava/lang/Object;)Ljava/lang/Class;"), 384 NATIVE_METHOD(DexFile, getClassNameList, "(Ljava/lang/Object;)[Ljava/lang/String;"), 385 NATIVE_METHOD(DexFile, isDexOptNeeded, "(Ljava/lang/String;)Z"), 386 NATIVE_METHOD(DexFile, getDexOptNeeded, 387 "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Z)I"), 388 NATIVE_METHOD(DexFile, openDexFileNative, 389 "(Ljava/lang/String;Ljava/lang/String;I)Ljava/lang/Object;"), 390}; 391 392void register_dalvik_system_DexFile(JNIEnv* env) { 393 REGISTER_NATIVE_METHODS("dalvik/system/DexFile"); 394} 395 396} // namespace art 397