blob: 9b29d257263f0c222a1974ce166c934d88293206 [file] [log] [blame]
/*
* 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 "class_loader.h"
#include "class_linker.h"
#include "dex_file.h"
#include "logging.h"
#include "os.h"
#include "runtime.h"
#include "toStringArray.h"
#include "ScopedUtfChars.h"
#include "JniConstants.h" // Last to avoid problems with LOG redefinition.
namespace art {
namespace {
// 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->ExceptionOccurred()) {
// 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_openDexFile(JNIEnv* env, jclass, jstring javaSourceName, jstring javaOutputName) {
ScopedUtfChars sourceName(env, javaSourceName);
if (sourceName.c_str() == NULL) {
return 0;
}
NullableScopedUtfChars outputName(env, javaOutputName);
if (env->ExceptionOccurred()) {
return 0;
}
const DexFile* dex_file = DexFile::Open(sourceName.c_str(), "");
if (dex_file == NULL) {
jniThrowExceptionFmt(env, "java/io/IOException", "unable to open DEX file: %s",
sourceName.c_str());
return NULL;
}
return static_cast<jint>(reinterpret_cast<uintptr_t>(dex_file));
}
static const DexFile* toDexFile(JNIEnv* env, int dex_file_address) {
const DexFile* dex_file = reinterpret_cast<const DexFile*>(static_cast<uintptr_t>(dex_file_address));
if ((dex_file == NULL)) {
jniThrowNullPointerException(env, "dex_file == null");
}
return dex_file;
}
void DexFile_closeDexFile(JNIEnv* env, jclass, jint cookie) {
const DexFile* dex_file = toDexFile(env, cookie);
if (dex_file == NULL) {
return;
}
if (Runtime::Current()->GetClassLinker()->IsDexFileRegistered(*dex_file)) {
return;
}
delete dex_file;
}
jclass DexFile_defineClass(JNIEnv* env, jclass, jstring javaName, jobject javaLoader, jint cookie) {
const DexFile* dex_file = toDexFile(env, cookie);
if (dex_file == NULL) {
return NULL;
}
ScopedUtfChars class_name(env, javaName);
if (class_name.c_str() == NULL) {
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) {
return NULL;
}
Object* class_loader_object = Decode<Object*>(env, javaLoader);
ClassLoader* class_loader = down_cast<ClassLoader*>(class_loader_object);
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
class_linker->RegisterDexFile(*dex_file);
Class* result = class_linker->DefineClass(descriptor, class_loader, *dex_file, *dex_class_def);
if (env->ExceptionCheck()) {
env->ExceptionClear();
return NULL;
}
return AddLocalReference<jclass>(env, result);
}
jobjectArray DexFile_getClassNameList(JNIEnv* env, jclass, jint cookie) {
const DexFile* dex_file = toDexFile(env, 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);
}
jboolean DexFile_isDexOptNeeded(JNIEnv* env, jclass, jstring javaFilename) {
ScopedUtfChars filename(env, javaFilename);
if (filename.c_str() == NULL) {
return JNI_TRUE;
}
if (!OS::FileExists(filename.c_str())) {
jniThrowExceptionFmt(env, "java/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.
ClassLinker* class_linker = Runtime::Current()->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()) {
return JNI_FALSE;
}
}
UniquePtr<const DexFile> dex_file(DexFile::Open(filename.c_str(), ""));
if (dex_file.get() == NULL) {
return JNI_TRUE;
}
const OatFile* oat_file = class_linker->FindOatFile(*dex_file.get());
if (oat_file == NULL) {
return JNI_TRUE;
}
const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file->GetLocation());
if (oat_dex_file == NULL) {
return JNI_TRUE;
}
if (oat_dex_file->GetDexFileChecksum() != dex_file->GetHeader().checksum_) {
return JNI_TRUE;
}
return JNI_FALSE;
}
static JNINativeMethod gMethods[] = {
NATIVE_METHOD(DexFile, closeDexFile, "(I)V"),
NATIVE_METHOD(DexFile, defineClass, "(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, openDexFile, "(Ljava/lang/String;Ljava/lang/String;I)I"),
};
} // namespace
void register_dalvik_system_DexFile(JNIEnv* env) {
jniRegisterNativeMethods(env, "dalvik/system/DexFile", gMethods, NELEM(gMethods));
}
} // namespace art