java_lang_Class.cc revision ee39a10e45a6a0880e8b829525c40d6055818560 
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 "dex_file-inl.h"
19#include "jni_internal.h"
20#include "nth_caller_visitor.h"
21#include "mirror/class-inl.h"
22#include "mirror/class_loader.h"
23#include "mirror/object-inl.h"
24#include "mirror/proxy.h"
25#include "object_utils.h"
26#include "scoped_thread_state_change.h"
27#include "ScopedLocalRef.h"
28#include "ScopedUtfChars.h"
29#include "well_known_classes.h"
30
31namespace art {
32
33static mirror::Class* DecodeClass(const ScopedObjectAccess& soa, jobject java_class)
34    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
35  mirror::Class* c = soa.Decode<mirror::Class*>(java_class);
36  DCHECK(c != NULL);
37  DCHECK(c->IsClass());
38  // TODO: we could EnsureInitialized here, rather than on every reflective get/set or invoke .
39  // For now, we conservatively preserve the old dalvik behavior. A quick "IsInitialized" check
40  // every time probably doesn't make much difference to reflection performance anyway.
41  return c;
42}
43
44// "name" is in "binary name" format, e.g. "dalvik.system.Debug$1".
45static jclass Class_classForName(JNIEnv* env, jclass, jstring javaName, jboolean initialize, jobject javaLoader) {
46  ScopedObjectAccess soa(env);
47  ScopedUtfChars name(env, javaName);
48  if (name.c_str() == NULL) {
49    return NULL;
50  }
51
52  // We need to validate and convert the name (from x.y.z to x/y/z).  This
53  // is especially handy for array types, since we want to avoid
54  // auto-generating bogus array classes.
55  if (!IsValidBinaryClassName(name.c_str())) {
56    ThrowLocation throw_location = soa.Self()->GetCurrentLocationForThrow();
57    soa.Self()->ThrowNewExceptionF(throw_location, "Ljava/lang/ClassNotFoundException;",
58                                   "Invalid name: %s", name.c_str());
59    return NULL;
60  }
61
62  std::string descriptor(DotToDescriptor(name.c_str()));
63  mirror::ClassLoader* class_loader = soa.Decode<mirror::ClassLoader*>(javaLoader);
64  ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
65  mirror::Class* c = class_linker->FindClass(descriptor.c_str(), class_loader);
66  if (c == NULL) {
67    ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred());
68    env->ExceptionClear();
69    jthrowable cnfe = reinterpret_cast<jthrowable>(env->NewObject(WellKnownClasses::java_lang_ClassNotFoundException,
70                                                                  WellKnownClasses::java_lang_ClassNotFoundException_init,
71                                                                  javaName, cause.get()));
72    env->Throw(cnfe);
73    return NULL;
74  }
75  if (initialize) {
76    class_linker->EnsureInitialized(c, true, true);
77  }
78  return soa.AddLocalReference<jclass>(c);
79}
80
81static jstring Class_getNameNative(JNIEnv* env, jobject javaThis) {
82  ScopedObjectAccess soa(env);
83  mirror::Class* c = DecodeClass(soa, javaThis);
84  return soa.AddLocalReference<jstring>(c->ComputeName());
85}
86
87static jobjectArray Class_getProxyInterfaces(JNIEnv* env, jobject javaThis) {
88  ScopedObjectAccess soa(env);
89  mirror::SynthesizedProxyClass* c =
90      down_cast<mirror::SynthesizedProxyClass*>(DecodeClass(soa, javaThis));
91  return soa.AddLocalReference<jobjectArray>(c->GetInterfaces()->Clone(soa.Self()));
92}
93
94static JNINativeMethod gMethods[] = {
95  NATIVE_METHOD(Class, classForName, "(Ljava/lang/String;ZLjava/lang/ClassLoader;)Ljava/lang/Class;"),
96  NATIVE_METHOD(Class, getNameNative, "()Ljava/lang/String;"),
97  NATIVE_METHOD(Class, getProxyInterfaces, "()[Ljava/lang/Class;"),
98};
99
100void register_java_lang_Class(JNIEnv* env) {
101  REGISTER_NATIVE_METHODS("java/lang/Class");
102}
103
104}  // namespace art
105