java_lang_VMClassLoader.cc revision eac766769e3114a078c188ea26776a81f0edb3cf 
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 "class_linker.h"
18#include "jni_internal.h"
19#include "ScopedUtfChars.h"
20#include "zip_archive.h"
21
22namespace art {
23
24static jclass VMClassLoader_findLoadedClass(JNIEnv* env, jclass, jobject javaLoader, jstring javaName) {
25  ClassLoader* loader = Decode<ClassLoader*>(env, javaLoader);
26  ScopedUtfChars name(env, javaName);
27  if (name.c_str() == NULL) {
28    return NULL;
29  }
30
31  std::string descriptor(DotToDescriptor(name.c_str()));
32  Class* c = Runtime::Current()->GetClassLinker()->LookupClass(descriptor.c_str(), loader);
33  if (c != NULL && c->IsResolved()) {
34    return AddLocalReference<jclass>(env, c);
35  } else {
36    // Class wasn't resolved so it may be erroneous or not yet ready, force the caller to go into
37    // the regular loadClass code.
38    return NULL;
39  }
40}
41
42static jint VMClassLoader_getBootClassPathSize(JNIEnv*, jclass) {
43  return Runtime::Current()->GetClassLinker()->GetBootClassPath().size();
44}
45
46/*
47 * Returns a string URL for a resource with the specified 'javaName' in
48 * entry 'index' of the boot class path.
49 *
50 * We return a newly-allocated String in the following form:
51 *
52 *   jar:file://path!/name
53 *
54 * Where "path" is the bootstrap class path entry and "name" is the string
55 * passed into this method.  "path" needs to be an absolute path (starting
56 * with '/'); if it's not we'd need to make it absolute as part of forming
57 * the URL string.
58 */
59static jstring VMClassLoader_getBootClassPathResource(JNIEnv* env, jclass, jstring javaName, jint index) {
60  ScopedUtfChars name(env, javaName);
61  if (name.c_str() == NULL) {
62    return NULL;
63  }
64
65  const std::vector<const DexFile*>& path = Runtime::Current()->GetClassLinker()->GetBootClassPath();
66  if (index < 0 || size_t(index) >= path.size()) {
67    return NULL;
68  }
69  const DexFile* dex_file = path[index];
70  const std::string& location(dex_file->GetLocation());
71  UniquePtr<ZipArchive> zip_archive(ZipArchive::Open(location));
72  if (zip_archive.get() == NULL) {
73    return NULL;
74  }
75  UniquePtr<ZipEntry> zip_entry(zip_archive->Find(name.c_str()));
76  if (zip_entry.get() == NULL) {
77    return NULL;
78  }
79
80  std::string url;
81  StringAppendF(&url, "jar:file://%s!/%s", location.c_str(), name.c_str());
82  return env->NewStringUTF(url.c_str());
83}
84
85static JNINativeMethod gMethods[] = {
86  NATIVE_METHOD(VMClassLoader, findLoadedClass, "(Ljava/lang/ClassLoader;Ljava/lang/String;)Ljava/lang/Class;"),
87  NATIVE_METHOD(VMClassLoader, getBootClassPathResource, "(Ljava/lang/String;I)Ljava/lang/String;"),
88  NATIVE_METHOD(VMClassLoader, getBootClassPathSize, "()I"),
89};
90
91void register_java_lang_VMClassLoader(JNIEnv* env) {
92  REGISTER_NATIVE_METHODS("java/lang/VMClassLoader");
93}
94
95}  // namespace art
96