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 "java_lang_reflect_Constructor.h"
18
19 #include "nativehelper/jni_macros.h"
20
21 #include "art_method-inl.h"
22 #include "base/enums.h"
23 #include "class_linker.h"
24 #include "class_root-inl.h"
25 #include "dex/dex_file_annotations.h"
26 #include "jni/jni_internal.h"
27 #include "mirror/class-alloc-inl.h"
28 #include "mirror/class-inl.h"
29 #include "mirror/executable-inl.h"
30 #include "mirror/method.h"
31 #include "mirror/object_array-alloc-inl.h"
32 #include "mirror/object-inl.h"
33 #include "native_util.h"
34 #include "reflection.h"
35 #include "scoped_fast_native_object_access-inl.h"
36 #include "well_known_classes.h"
37
38 namespace art {
39
Constructor_getExceptionTypes(JNIEnv * env,jobject javaMethod)40 static jobjectArray Constructor_getExceptionTypes(JNIEnv* env, jobject javaMethod) {
41 ScopedFastNativeObjectAccess soa(env);
42 ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod)
43 ->GetInterfaceMethodIfProxy(kRuntimePointerSize);
44 ObjPtr<mirror::ObjectArray<mirror::Class>> result_array =
45 annotations::GetExceptionTypesForMethod(method);
46 if (result_array == nullptr) {
47 // Return an empty array instead of a null pointer.
48 ObjPtr<mirror::Class> class_array_class = GetClassRoot<mirror::ObjectArray<mirror::Class>>();
49 DCHECK(class_array_class != nullptr);
50 ObjPtr<mirror::ObjectArray<mirror::Class>> empty_array =
51 mirror::ObjectArray<mirror::Class>::Alloc(soa.Self(), class_array_class, 0);
52 return soa.AddLocalReference<jobjectArray>(empty_array);
53 } else {
54 return soa.AddLocalReference<jobjectArray>(result_array);
55 }
56 }
57
58 /*
59 * We can also safely assume the constructor isn't associated
60 * with an interface, array, or primitive class. If this is coming from
61 * native, it is OK to avoid access checks since JNI does not enforce them.
62 */
Constructor_newInstance0(JNIEnv * env,jobject javaMethod,jobjectArray javaArgs)63 static jobject Constructor_newInstance0(JNIEnv* env, jobject javaMethod, jobjectArray javaArgs) {
64 ScopedFastNativeObjectAccess soa(env);
65 ObjPtr<mirror::Constructor> m = soa.Decode<mirror::Constructor>(javaMethod);
66 ArtMethod* constructor_art_method = m->GetArtMethod();
67 StackHandleScope<1> hs(soa.Self());
68 Handle<mirror::Class> c(hs.NewHandle(m->GetDeclaringClass()));
69 if (UNLIKELY(c->IsAbstract())) {
70 soa.Self()->ThrowNewExceptionF("Ljava/lang/InstantiationException;", "Can't instantiate %s %s",
71 c->IsInterface() ? "interface" : "abstract class",
72 c->PrettyDescriptor().c_str());
73 return nullptr;
74 }
75 // Verify that we can access the class.
76 if (!m->IsAccessible() && !c->IsPublic()) {
77 // Go 2 frames back, this method is always called from newInstance0, which is called from
78 // Constructor.newInstance(Object... args).
79 ObjPtr<mirror::Class> caller = GetCallingClass(soa.Self(), 2);
80 // If caller is null, then we called from JNI, just avoid the check since JNI avoids most
81 // access checks anyways. TODO: Investigate if this the correct behavior.
82 if (caller != nullptr && !caller->CanAccess(c.Get())) {
83 if (c->PrettyDescriptor() == "dalvik.system.DexPathList$Element") {
84 // b/20699073.
85 LOG(WARNING) << "The dalvik.system.DexPathList$Element constructor is not accessible by "
86 "default. This is a temporary workaround for backwards compatibility "
87 "with class-loader hacks. Please update your application.";
88 } else {
89 soa.Self()->ThrowNewExceptionF(
90 "Ljava/lang/IllegalAccessException;", "%s is not accessible from %s",
91 c->PrettyClass().c_str(),
92 caller->PrettyClass().c_str());
93 return nullptr;
94 }
95 }
96 }
97 if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(soa.Self(), c, true, true)) {
98 DCHECK(soa.Self()->IsExceptionPending());
99 return nullptr;
100 }
101 bool movable = true;
102 if (!kMovingClasses && c->IsClassClass()) {
103 movable = false;
104 }
105
106 // String constructor is replaced by a StringFactory method in InvokeMethod.
107 if (UNLIKELY(c->IsStringClass())) {
108 return InvokeMethod<kRuntimePointerSize>(soa, javaMethod, nullptr, javaArgs, 2);
109 }
110
111 ObjPtr<mirror::Object> receiver =
112 movable ? c->AllocObject(soa.Self()) : c->AllocNonMovableObject(soa.Self());
113 if (UNLIKELY(receiver == nullptr)) {
114 DCHECK(soa.Self()->IsExceptionPending());
115 return nullptr;
116 }
117 jobject javaReceiver = soa.AddLocalReference<jobject>(receiver);
118
119 InvokeConstructor(soa, constructor_art_method, receiver, javaArgs);
120
121 return javaReceiver;
122 }
123
Constructor_newInstanceFromSerialization(JNIEnv * env,jclass unused ATTRIBUTE_UNUSED,jclass ctorClass,jclass allocClass)124 static jobject Constructor_newInstanceFromSerialization(JNIEnv* env, jclass unused ATTRIBUTE_UNUSED,
125 jclass ctorClass, jclass allocClass) {
126 jmethodID ctor = env->GetMethodID(ctorClass, "<init>", "()V");
127 DCHECK(ctor != nullptr);
128 return env->NewObject(allocClass, ctor);
129 }
130
131 static JNINativeMethod gMethods[] = {
132 FAST_NATIVE_METHOD(Constructor, getExceptionTypes, "()[Ljava/lang/Class;"),
133 FAST_NATIVE_METHOD(Constructor, newInstance0, "([Ljava/lang/Object;)Ljava/lang/Object;"),
134 FAST_NATIVE_METHOD(Constructor, newInstanceFromSerialization, "(Ljava/lang/Class;Ljava/lang/Class;)Ljava/lang/Object;"),
135 };
136
register_java_lang_reflect_Constructor(JNIEnv * env)137 void register_java_lang_reflect_Constructor(JNIEnv* env) {
138 REGISTER_NATIVE_METHODS("java/lang/reflect/Constructor");
139 }
140
141 } // namespace art
142