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 "scoped_thread_state_change.h"
25 #include "scoped_fast_native_object_access.h"
26 #include "ScopedLocalRef.h"
27 #include "ScopedUtfChars.h"
28 #include "well_known_classes.h"
29
30 namespace art {
31
DecodeClass(const ScopedFastNativeObjectAccess & soa,jobject java_class)32 static mirror::Class* DecodeClass(const ScopedFastNativeObjectAccess& soa, jobject java_class)
33 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
34 mirror::Class* c = soa.Decode<mirror::Class*>(java_class);
35 DCHECK(c != NULL);
36 DCHECK(c->IsClass());
37 // TODO: we could EnsureInitialized here, rather than on every reflective get/set or invoke .
38 // For now, we conservatively preserve the old dalvik behavior. A quick "IsInitialized" check
39 // every time probably doesn't make much difference to reflection performance anyway.
40 return c;
41 }
42
43 // "name" is in "binary name" format, e.g. "dalvik.system.Debug$1".
Class_classForName(JNIEnv * env,jclass,jstring javaName,jboolean initialize,jobject javaLoader)44 static jclass Class_classForName(JNIEnv* env, jclass, jstring javaName, jboolean initialize,
45 jobject javaLoader) {
46 ScopedFastNativeObjectAccess soa(env);
47 ScopedUtfChars name(env, javaName);
48 if (name.c_str() == nullptr) {
49 return nullptr;
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 nullptr;
60 }
61
62 std::string descriptor(DotToDescriptor(name.c_str()));
63 StackHandleScope<2> hs(soa.Self());
64 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(soa.Decode<mirror::ClassLoader*>(javaLoader)));
65 ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
66 Handle<mirror::Class> c(
67 hs.NewHandle(class_linker->FindClass(soa.Self(), descriptor.c_str(), class_loader)));
68 if (c.Get() == nullptr) {
69 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred());
70 env->ExceptionClear();
71 jthrowable cnfe = reinterpret_cast<jthrowable>(env->NewObject(WellKnownClasses::java_lang_ClassNotFoundException,
72 WellKnownClasses::java_lang_ClassNotFoundException_init,
73 javaName, cause.get()));
74 if (cnfe != nullptr) {
75 // Make sure allocation didn't fail with an OOME.
76 env->Throw(cnfe);
77 }
78 return nullptr;
79 }
80 if (initialize) {
81 class_linker->EnsureInitialized(c, true, true);
82 }
83 return soa.AddLocalReference<jclass>(c.Get());
84 }
85
Class_getNameNative(JNIEnv * env,jobject javaThis)86 static jstring Class_getNameNative(JNIEnv* env, jobject javaThis) {
87 ScopedFastNativeObjectAccess soa(env);
88 StackHandleScope<1> hs(soa.Self());
89 mirror::Class* const c = DecodeClass(soa, javaThis);
90 return soa.AddLocalReference<jstring>(mirror::Class::ComputeName(hs.NewHandle(c)));
91 }
92
Class_getProxyInterfaces(JNIEnv * env,jobject javaThis)93 static jobjectArray Class_getProxyInterfaces(JNIEnv* env, jobject javaThis) {
94 ScopedFastNativeObjectAccess soa(env);
95 mirror::Class* c = DecodeClass(soa, javaThis);
96 return soa.AddLocalReference<jobjectArray>(c->GetInterfaces()->Clone(soa.Self()));
97 }
98
99 static JNINativeMethod gMethods[] = {
100 NATIVE_METHOD(Class, classForName, "!(Ljava/lang/String;ZLjava/lang/ClassLoader;)Ljava/lang/Class;"),
101 NATIVE_METHOD(Class, getNameNative, "!()Ljava/lang/String;"),
102 NATIVE_METHOD(Class, getProxyInterfaces, "!()[Ljava/lang/Class;"),
103 };
104
register_java_lang_Class(JNIEnv * env)105 void register_java_lang_Class(JNIEnv* env) {
106 REGISTER_NATIVE_METHODS("java/lang/Class");
107 }
108
109 } // namespace art
110