runtime/native/dalvik_system_DexFile.cc - platform/art - Gitiles

 /*
  * Copyright (C) 2008 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 <unistd.h>

 #include "base/logging.h"
 #include "class_linker.h"
 #include "common_throws.h"
 #include "dex_file-inl.h"
 #include "gc/space/image_space.h"
 #include "gc/space/space-inl.h"
 #include "image.h"
 #include "jni_internal.h"
 #include "mirror/class_loader.h"
 #include "mirror/object-inl.h"
 #include "mirror/string.h"
 #include "oat.h"
 #include "os.h"
 #include "runtime.h"
 #include "scoped_thread_state_change.h"
 #include "ScopedLocalRef.h"
 #include "ScopedUtfChars.h"
 #include "toStringArray.h"
 #include "zip_archive.h"

 namespace art {

 // A smart pointer that provides read-only access to a Java string's UTF chars.
 // Unlike libcore's NullableScopedUtfChars, this will *not* throw NullPointerException if
 // passed a null jstring. The correct idiom is:
 //
 //   NullableScopedUtfChars name(env, javaName);
 //   if (env->ExceptionCheck()) {
 //       return NULL;
 //   }
 //   // ... use name.c_str()
 //
 // TODO: rewrite to get rid of this, or change ScopedUtfChars to offer this option.
 class NullableScopedUtfChars {
  public:
   NullableScopedUtfChars(JNIEnv* env, jstring s) : mEnv(env), mString(s) {
     mUtfChars = (s != NULL) ? env->GetStringUTFChars(s, NULL) : NULL;
   }

   ~NullableScopedUtfChars() {
     if (mUtfChars) {
       mEnv->ReleaseStringUTFChars(mString, mUtfChars);
     }
   }

   const char* c_str() const {
     return mUtfChars;
   }

   size_t size() const {
     return strlen(mUtfChars);
   }

   // Element access.
   const char& operator[](size_t n) const {
     return mUtfChars[n];
   }

  private:
   JNIEnv* mEnv;
   jstring mString;
   const char* mUtfChars;

   // Disallow copy and assignment.
   NullableScopedUtfChars(const NullableScopedUtfChars&);
   void operator=(const NullableScopedUtfChars&);
 };

 static jint DexFile_openDexFileNative(JNIEnv* env, jclass, jstring javaSourceName, jstring javaOutputName, jint) {
   ScopedUtfChars sourceName(env, javaSourceName);
   if (sourceName.c_str() == NULL) {
     return 0;
   }
   std::string source(sourceName.c_str());
   NullableScopedUtfChars outputName(env, javaOutputName);
   if (env->ExceptionCheck()) {
     return 0;
   }
   ScopedObjectAccess soa(env);
   const DexFile* dex_file;
   if (outputName.c_str() == NULL) {
     dex_file = Runtime::Current()->GetClassLinker()->FindDexFileInOatFileFromDexLocation(source);
   } else {
     std::string output(outputName.c_str());
     dex_file =
         Runtime::Current()->GetClassLinker()->FindOrCreateOatFileForDexLocation(source, output);
   }
   if (dex_file == NULL) {
     LOG(WARNING) << "Failed to open dex file: " << source;
     ThrowLocation throw_location = soa.Self()->GetCurrentLocationForThrow();
     soa.Self()->ThrowNewExceptionF(throw_location, "Ljava/io/IOException;",
                                    "Unable to open dex file: %s", source.c_str());
     return 0;
   }
   return static_cast<jint>(reinterpret_cast<uintptr_t>(dex_file));
 }

 static const DexFile* toDexFile(int dex_file_address) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
   const DexFile* dex_file = reinterpret_cast<const DexFile*>(static_cast<uintptr_t>(dex_file_address));
   if (dex_file == NULL) {
     ThrowNullPointerException(NULL, "dex_file == null");
   }
   return dex_file;
 }

 static void DexFile_closeDexFile(JNIEnv* env, jclass, jint cookie) {
   const DexFile* dex_file;
   {
     ScopedObjectAccess soa(env);
     dex_file = toDexFile(cookie);
   }
   if (dex_file == NULL) {
     return;
   }
   if (Runtime::Current()->GetClassLinker()->IsDexFileRegistered(*dex_file)) {
     return;
   }
   delete dex_file;
 }

 static jclass DexFile_defineClassNative(JNIEnv* env, jclass, jstring javaName, jobject javaLoader,
                                         jint cookie) {
   ScopedObjectAccess soa(env);
   const DexFile* dex_file = toDexFile(cookie);
   if (dex_file == NULL) {
     VLOG(class_linker) << "Failed to find dex_file";
     return NULL;
   }
   ScopedUtfChars class_name(env, javaName);
   if (class_name.c_str() == NULL) {
     VLOG(class_linker) << "Failed to find class_name";
     return NULL;
   }
   const std::string descriptor(DotToDescriptor(class_name.c_str()));
   const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor);
   if (dex_class_def == NULL) {
     VLOG(class_linker) << "Failed to find dex_class_def";
     return NULL;
   }
   ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
   class_linker->RegisterDexFile(*dex_file);
   mirror::ClassLoader* class_loader = soa.Decode<mirror::ClassLoader*>(javaLoader);
   mirror::Class* result = class_linker->DefineClass(descriptor, class_loader, *dex_file, *dex_class_def);
   VLOG(class_linker) << "DexFile_defineClassNative returning " << result;
   return soa.AddLocalReference<jclass>(result);
 }

 static jobjectArray DexFile_getClassNameList(JNIEnv* env, jclass, jint cookie) {
   const DexFile* dex_file;
   {
     ScopedObjectAccess soa(env);
     dex_file = toDexFile(cookie);
   }
   if (dex_file == NULL) {
     return NULL;
   }

   std::vector<std::string> class_names;
   for (size_t i = 0; i < dex_file->NumClassDefs(); ++i) {
     const DexFile::ClassDef& class_def = dex_file->GetClassDef(i);
     const char* descriptor = dex_file->GetClassDescriptor(class_def);
     class_names.push_back(DescriptorToDot(descriptor));
   }
   return toStringArray(env, class_names);
 }

 static jboolean DexFile_isDexOptNeeded(JNIEnv* env, jclass, jstring javaFilename) {
   bool debug_logging = false;

   ScopedUtfChars filename(env, javaFilename);
   if (filename.c_str() == NULL) {
     LOG(ERROR) << "DexFile_isDexOptNeeded null filename";
     return JNI_TRUE;
   }

   if (!OS::FileExists(filename.c_str())) {
     LOG(ERROR) << "DexFile_isDexOptNeeded file '" << filename.c_str() << "' does not exist";
     ScopedObjectAccess soa(env);
     ThrowLocation throw_location = soa.Self()->GetCurrentLocationForThrow();
     soa.Self()->ThrowNewExceptionF(throw_location, "Ljava/io/FileNotFoundException;",
                                    "%s", filename.c_str());
     return JNI_TRUE;
   }

   // Always treat elements of the bootclasspath as up-to-date.  The
   // fact that code is running at all means that this should be true.
   Runtime* runtime = Runtime::Current();
   ClassLinker* class_linker = runtime->GetClassLinker();
   const std::vector<const DexFile*>& boot_class_path = class_linker->GetBootClassPath();
   for (size_t i = 0; i < boot_class_path.size(); i++) {
     if (boot_class_path[i]->GetLocation() == filename.c_str()) {
       if (debug_logging) {
         LOG(INFO) << "DexFile_isDexOptNeeded ignoring boot class path file: " << filename.c_str();
       }
       return JNI_FALSE;
     }
   }

   // Check if we have an odex file next to the dex file.
   std::string odex_filename(OatFile::DexFilenameToOdexFilename(filename.c_str()));
   UniquePtr<const OatFile> oat_file(OatFile::Open(odex_filename, odex_filename, NULL, false));
   if (oat_file.get() != NULL) {
     ScopedObjectAccess soa(env);
     const art::OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(filename.c_str());
     if (oat_dex_file == NULL) {
       if (debug_logging) {
         LOG(INFO) << "DexFile_isDexOptNeeded GetOatDexFile failed";
       }
     } else {
       uint32_t location_checksum;
       // If we have no classes.dex checksum such as in a user build, assume up-to-date.
       if (!DexFile::GetChecksum(filename.c_str(), location_checksum)) {
         if (debug_logging) {
           LOG(INFO) << "DexFile_isDexOptNeeded ignoring precompiled stripped file: "
               << filename.c_str();
         }
         return JNI_FALSE;
       }
       if (ClassLinker::VerifyOatFileChecksums(oat_file.get(), filename.c_str(), location_checksum)) {
         if (debug_logging) {
           LOG(INFO) << "DexFile_isDexOptNeeded precompiled file " << odex_filename
               << " is up-to-date checksum compared to " << filename.c_str();
         }
         return JNI_FALSE;
       }
     }
   }

   // Check if we have an oat file in the cache
   std::string cache_location(GetDalvikCacheFilenameOrDie(filename.c_str()));
   oat_file.reset(OatFile::Open(cache_location, filename.c_str(), NULL, false));
   if (oat_file.get() == NULL) {
     LOG(INFO) << "DexFile_isDexOptNeeded cache file " << cache_location
               << " does not exist for " << filename.c_str();
     return JNI_TRUE;
   }

   gc::Heap* heap = runtime->GetHeap();
   const std::vector<gc::space::ContinuousSpace*>& spaces = heap->GetContinuousSpaces();
   // TODO: C++0x auto
   typedef std::vector<gc::space::ContinuousSpace*>::const_iterator It;
   for (It it = spaces.begin(), end = spaces.end(); it != end; ++it) {
     if ((*it)->IsImageSpace()) {
       // TODO: Ensure this works with multiple image spaces.
       const ImageHeader& image_header = (*it)->AsImageSpace()->GetImageHeader();
       if (oat_file->GetOatHeader().GetImageFileLocationOatChecksum() != image_header.GetOatChecksum()) {
         ScopedObjectAccess soa(env);
         LOG(INFO) << "DexFile_isDexOptNeeded cache file " << cache_location
                   << " has out-of-date oat checksum compared to "
                   << image_header.GetImageRoot(ImageHeader::kOatLocation)->AsString()->ToModifiedUtf8();
         return JNI_TRUE;
       }
       if (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin()
           != reinterpret_cast<uint32_t>(image_header.GetOatDataBegin())) {
         ScopedObjectAccess soa(env);
         LOG(INFO) << "DexFile_isDexOptNeeded cache file " << cache_location
                   << " has out-of-date oat begin compared to "
                   << image_header.GetImageRoot(ImageHeader::kOatLocation)->AsString()->ToModifiedUtf8();
         return JNI_TRUE;
       }
     }
   }

   ScopedObjectAccess soa(env);
   uint32_t location_checksum;
   if (!DexFile::GetChecksum(filename.c_str(), location_checksum)) {
     LOG(ERROR) << "DexFile_isDexOptNeeded failed to compute checksum of " << filename.c_str();
     return JNI_TRUE;
   }

   if (!ClassLinker::VerifyOatFileChecksums(oat_file.get(), filename.c_str(), location_checksum)) {
     LOG(INFO) << "DexFile_isDexOptNeeded cache file " << cache_location
         << " has out-of-date checksum compared to " << filename.c_str();
     return JNI_TRUE;
   }

   if (debug_logging) {
     LOG(INFO) << "DexFile_isDexOptNeeded cache file " << cache_location
               << " is up-to-date for " << filename.c_str();
   }
   return JNI_FALSE;
 }

 static JNINativeMethod gMethods[] = {
   NATIVE_METHOD(DexFile, closeDexFile, "(I)V"),
   NATIVE_METHOD(DexFile, defineClassNative, "(Ljava/lang/String;Ljava/lang/ClassLoader;I)Ljava/lang/Class;"),
   NATIVE_METHOD(DexFile, getClassNameList, "(I)[Ljava/lang/String;"),
   NATIVE_METHOD(DexFile, isDexOptNeeded, "(Ljava/lang/String;)Z"),
   NATIVE_METHOD(DexFile, openDexFileNative, "(Ljava/lang/String;Ljava/lang/String;I)I"),
 };

 void register_dalvik_system_DexFile(JNIEnv* env) {
   REGISTER_NATIVE_METHODS("dalvik/system/DexFile");
 }

 }  // namespace art
	/*
	* Copyright (C) 2008 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 <unistd.h>

	#include "base/logging.h"
	#include "class_linker.h"
	#include "common_throws.h"
	#include "dex_file-inl.h"
	#include "gc/space/image_space.h"
	#include "gc/space/space-inl.h"
	#include "image.h"
	#include "jni_internal.h"
	#include "mirror/class_loader.h"
	#include "mirror/object-inl.h"
	#include "mirror/string.h"
	#include "oat.h"
	#include "os.h"
	#include "runtime.h"
	#include "scoped_thread_state_change.h"
	#include "ScopedLocalRef.h"
	#include "ScopedUtfChars.h"
	#include "toStringArray.h"
	#include "zip_archive.h"

	namespace art {

	// A smart pointer that provides read-only access to a Java string's UTF chars.
	// Unlike libcore's NullableScopedUtfChars, this will not throw NullPointerException if
	// passed a null jstring. The correct idiom is:
	//
	// NullableScopedUtfChars name(env, javaName);
	// if (env->ExceptionCheck()) {
	// return NULL;
	// }
	// // ... use name.c_str()
	//
	// TODO: rewrite to get rid of this, or change ScopedUtfChars to offer this option.
	class NullableScopedUtfChars {
	public:
	NullableScopedUtfChars(JNIEnv* env, jstring s) : mEnv(env), mString(s) {
	mUtfChars = (s != NULL) ? env->GetStringUTFChars(s, NULL) : NULL;
	}

	~NullableScopedUtfChars() {
	if (mUtfChars) {
	mEnv->ReleaseStringUTFChars(mString, mUtfChars);
	}
	}

	const char* c_str() const {
	return mUtfChars;
	}

	size_t size() const {
	return strlen(mUtfChars);
	}

	// Element access.
	const char& operator[](size_t n) const {
	return mUtfChars[n];
	}

	private:
	JNIEnv* mEnv;
	jstring mString;
	const char* mUtfChars;

	// Disallow copy and assignment.
	NullableScopedUtfChars(const NullableScopedUtfChars&);
	void operator=(const NullableScopedUtfChars&);
	};

	static jint DexFile_openDexFileNative(JNIEnv* env, jclass, jstring javaSourceName, jstring javaOutputName, jint) {
	ScopedUtfChars sourceName(env, javaSourceName);
	if (sourceName.c_str() == NULL) {
	return 0;
	}
	std::string source(sourceName.c_str());
	NullableScopedUtfChars outputName(env, javaOutputName);
	if (env->ExceptionCheck()) {
	return 0;
	}
	ScopedObjectAccess soa(env);
	const DexFile* dex_file;
	if (outputName.c_str() == NULL) {
	dex_file = Runtime::Current()->GetClassLinker()->FindDexFileInOatFileFromDexLocation(source);
	} else {
	std::string output(outputName.c_str());
	dex_file =
	Runtime::Current()->GetClassLinker()->FindOrCreateOatFileForDexLocation(source, output);
	}
	if (dex_file == NULL) {
	LOG(WARNING) << "Failed to open dex file: " << source;
	ThrowLocation throw_location = soa.Self()->GetCurrentLocationForThrow();
	soa.Self()->ThrowNewExceptionF(throw_location, "Ljava/io/IOException;",
	"Unable to open dex file: %s", source.c_str());
	return 0;
	}
	return static_cast<jint>(reinterpret_cast<uintptr_t>(dex_file));
	}

	static const DexFile* toDexFile(int dex_file_address) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
	const DexFile* dex_file = reinterpret_cast<const DexFile*>(static_cast<uintptr_t>(dex_file_address));
	if (dex_file == NULL) {
	ThrowNullPointerException(NULL, "dex_file == null");
	}
	return dex_file;
	}

	static void DexFile_closeDexFile(JNIEnv* env, jclass, jint cookie) {
	const DexFile* dex_file;
	{
	ScopedObjectAccess soa(env);
	dex_file = toDexFile(cookie);
	}
	if (dex_file == NULL) {
	return;
	}
	if (Runtime::Current()->GetClassLinker()->IsDexFileRegistered(*dex_file)) {
	return;
	}
	delete dex_file;
	}

	static jclass DexFile_defineClassNative(JNIEnv* env, jclass, jstring javaName, jobject javaLoader,
	jint cookie) {
	ScopedObjectAccess soa(env);
	const DexFile* dex_file = toDexFile(cookie);
	if (dex_file == NULL) {
	VLOG(class_linker) << "Failed to find dex_file";
	return NULL;
	}
	ScopedUtfChars class_name(env, javaName);
	if (class_name.c_str() == NULL) {
	VLOG(class_linker) << "Failed to find class_name";
	return NULL;
	}
	const std::string descriptor(DotToDescriptor(class_name.c_str()));
	const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor);
	if (dex_class_def == NULL) {
	VLOG(class_linker) << "Failed to find dex_class_def";
	return NULL;
	}
	ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
	class_linker->RegisterDexFile(*dex_file);
	mirror::ClassLoader* class_loader = soa.Decode<mirror::ClassLoader*>(javaLoader);
	mirror::Class* result = class_linker->DefineClass(descriptor, class_loader, dex_file, dex_class_def);
	VLOG(class_linker) << "DexFile_defineClassNative returning " << result;
	return soa.AddLocalReference<jclass>(result);
	}

	static jobjectArray DexFile_getClassNameList(JNIEnv* env, jclass, jint cookie) {
	const DexFile* dex_file;
	{
	ScopedObjectAccess soa(env);
	dex_file = toDexFile(cookie);
	}
	if (dex_file == NULL) {
	return NULL;
	}

	std::vector<std::string> class_names;
	for (size_t i = 0; i < dex_file->NumClassDefs(); ++i) {
	const DexFile::ClassDef& class_def = dex_file->GetClassDef(i);
	const char* descriptor = dex_file->GetClassDescriptor(class_def);
	class_names.push_back(DescriptorToDot(descriptor));
	}
	return toStringArray(env, class_names);
	}

	static jboolean DexFile_isDexOptNeeded(JNIEnv* env, jclass, jstring javaFilename) {
	bool debug_logging = false;

	ScopedUtfChars filename(env, javaFilename);
	if (filename.c_str() == NULL) {
	LOG(ERROR) << "DexFile_isDexOptNeeded null filename";
	return JNI_TRUE;
	}

	if (!OS::FileExists(filename.c_str())) {
	LOG(ERROR) << "DexFile_isDexOptNeeded file '" << filename.c_str() << "' does not exist";
	ScopedObjectAccess soa(env);
	ThrowLocation throw_location = soa.Self()->GetCurrentLocationForThrow();
	soa.Self()->ThrowNewExceptionF(throw_location, "Ljava/io/FileNotFoundException;",
	"%s", filename.c_str());
	return JNI_TRUE;
	}

	// Always treat elements of the bootclasspath as up-to-date. The
	// fact that code is running at all means that this should be true.
	Runtime* runtime = Runtime::Current();
	ClassLinker* class_linker = runtime->GetClassLinker();
	const std::vector<const DexFile*>& boot_class_path = class_linker->GetBootClassPath();
	for (size_t i = 0; i < boot_class_path.size(); i++) {
	if (boot_class_path[i]->GetLocation() == filename.c_str()) {
	if (debug_logging) {
	LOG(INFO) << "DexFile_isDexOptNeeded ignoring boot class path file: " << filename.c_str();
	}
	return JNI_FALSE;
	}
	}

	// Check if we have an odex file next to the dex file.
	std::string odex_filename(OatFile::DexFilenameToOdexFilename(filename.c_str()));
	UniquePtr<const OatFile> oat_file(OatFile::Open(odex_filename, odex_filename, NULL, false));
	if (oat_file.get() != NULL) {
	ScopedObjectAccess soa(env);
	const art::OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(filename.c_str());
	if (oat_dex_file == NULL) {
	if (debug_logging) {
	LOG(INFO) << "DexFile_isDexOptNeeded GetOatDexFile failed";
	}
	} else {
	uint32_t location_checksum;
	// If we have no classes.dex checksum such as in a user build, assume up-to-date.
	if (!DexFile::GetChecksum(filename.c_str(), location_checksum)) {
	if (debug_logging) {
	LOG(INFO) << "DexFile_isDexOptNeeded ignoring precompiled stripped file: "
	<< filename.c_str();
	}
	return JNI_FALSE;
	}
	if (ClassLinker::VerifyOatFileChecksums(oat_file.get(), filename.c_str(), location_checksum)) {
	if (debug_logging) {
	LOG(INFO) << "DexFile_isDexOptNeeded precompiled file " << odex_filename
	<< " is up-to-date checksum compared to " << filename.c_str();
	}
	return JNI_FALSE;
	}
	}
	}

	// Check if we have an oat file in the cache
	std::string cache_location(GetDalvikCacheFilenameOrDie(filename.c_str()));
	oat_file.reset(OatFile::Open(cache_location, filename.c_str(), NULL, false));
	if (oat_file.get() == NULL) {
	LOG(INFO) << "DexFile_isDexOptNeeded cache file " << cache_location
	<< " does not exist for " << filename.c_str();
	return JNI_TRUE;
	}

	gc::Heap* heap = runtime->GetHeap();
	const std::vector<gc::space::ContinuousSpace*>& spaces = heap->GetContinuousSpaces();
	// TODO: C++0x auto
	typedef std::vector<gc::space::ContinuousSpace*>::const_iterator It;
	for (It it = spaces.begin(), end = spaces.end(); it != end; ++it) {
	if ((*it)->IsImageSpace()) {
	// TODO: Ensure this works with multiple image spaces.
	const ImageHeader& image_header = (*it)->AsImageSpace()->GetImageHeader();
	if (oat_file->GetOatHeader().GetImageFileLocationOatChecksum() != image_header.GetOatChecksum()) {
	ScopedObjectAccess soa(env);
	LOG(INFO) << "DexFile_isDexOptNeeded cache file " << cache_location
	<< " has out-of-date oat checksum compared to "
	<< image_header.GetImageRoot(ImageHeader::kOatLocation)->AsString()->ToModifiedUtf8();
	return JNI_TRUE;
	}
	if (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin()
	!= reinterpret_cast<uint32_t>(image_header.GetOatDataBegin())) {
	ScopedObjectAccess soa(env);
	LOG(INFO) << "DexFile_isDexOptNeeded cache file " << cache_location
	<< " has out-of-date oat begin compared to "
	<< image_header.GetImageRoot(ImageHeader::kOatLocation)->AsString()->ToModifiedUtf8();
	return JNI_TRUE;
	}
	}
	}

	ScopedObjectAccess soa(env);
	uint32_t location_checksum;
	if (!DexFile::GetChecksum(filename.c_str(), location_checksum)) {
	LOG(ERROR) << "DexFile_isDexOptNeeded failed to compute checksum of " << filename.c_str();
	return JNI_TRUE;
	}

	if (!ClassLinker::VerifyOatFileChecksums(oat_file.get(), filename.c_str(), location_checksum)) {
	LOG(INFO) << "DexFile_isDexOptNeeded cache file " << cache_location
	<< " has out-of-date checksum compared to " << filename.c_str();
	return JNI_TRUE;
	}

	if (debug_logging) {
	LOG(INFO) << "DexFile_isDexOptNeeded cache file " << cache_location
	<< " is up-to-date for " << filename.c_str();
	}
	return JNI_FALSE;
	}

	static JNINativeMethod gMethods[] = {
	NATIVE_METHOD(DexFile, closeDexFile, "(I)V"),
	NATIVE_METHOD(DexFile, defineClassNative, "(Ljava/lang/String;Ljava/lang/ClassLoader;I)Ljava/lang/Class;"),
	NATIVE_METHOD(DexFile, getClassNameList, "(I)[Ljava/lang/String;"),
	NATIVE_METHOD(DexFile, isDexOptNeeded, "(Ljava/lang/String;)Z"),
	NATIVE_METHOD(DexFile, openDexFileNative, "(Ljava/lang/String;Ljava/lang/String;I)I"),
	};

	void register_dalvik_system_DexFile(JNIEnv* env) {
	REGISTER_NATIVE_METHODS("dalvik/system/DexFile");
	}

	} // namespace art