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 "art_method-inl.h"
20 #include "class_linker.h"
21 #include "jni_internal.h"
22 #include "mirror/class-inl.h"
23 #include "mirror/method.h"
24 #include "mirror/object-inl.h"
25 #include "reflection.h"
26 #include "scoped_fast_native_object_access.h"
27 #include "well_known_classes.h"
28
29 namespace art {
30
31 /*
32 * We can also safely assume the constructor isn't associated
33 * with an interface, array, or primitive class. If this is coming from
34 * native, it is OK to avoid access checks since JNI does not enforce them.
35 */
Constructor_newInstance(JNIEnv * env,jobject javaMethod,jobjectArray javaArgs)36 static jobject Constructor_newInstance(JNIEnv* env, jobject javaMethod, jobjectArray javaArgs) {
37 ScopedFastNativeObjectAccess soa(env);
38 mirror::Constructor* m = soa.Decode<mirror::Constructor*>(javaMethod);
39 StackHandleScope<1> hs(soa.Self());
40 Handle<mirror::Class> c(hs.NewHandle(m->GetDeclaringClass()));
41 if (UNLIKELY(c->IsAbstract())) {
42 soa.Self()->ThrowNewExceptionF("Ljava/lang/InstantiationException;", "Can't instantiate %s %s",
43 c->IsInterface() ? "interface" : "abstract class",
44 PrettyDescriptor(c.Get()).c_str());
45 return nullptr;
46 }
47 // Verify that we can access the class.
48 if (!m->IsAccessible() && !c->IsPublic()) {
49 auto* caller = GetCallingClass(soa.Self(), 1);
50 // If caller is null, then we called from JNI, just avoid the check since JNI avoids most
51 // access checks anyways. TODO: Investigate if this the correct behavior.
52 if (caller != nullptr && !caller->CanAccess(c.Get())) {
53 if (PrettyDescriptor(c.Get()) == "dalvik.system.DexPathList$Element") {
54 // b/20699073.
55 LOG(WARNING) << "The dalvik.system.DexPathList$Element constructor is not accessible by "
56 "default. This is a temporary workaround for backwards compatibility "
57 "with class-loader hacks. Please update your application.";
58 } else {
59 soa.Self()->ThrowNewExceptionF(
60 "Ljava/lang/IllegalAccessException;", "%s is not accessible from %s",
61 PrettyClass(c.Get()).c_str(), PrettyClass(caller).c_str());
62 return nullptr;
63 }
64 }
65 }
66 if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(soa.Self(), c, true, true)) {
67 DCHECK(soa.Self()->IsExceptionPending());
68 return nullptr;
69 }
70 bool movable = true;
71 if (!kMovingClasses && c->IsClassClass()) {
72 movable = false;
73 }
74
75 // String constructor is replaced by a StringFactory method in InvokeMethod.
76 if (c->IsStringClass()) {
77 return InvokeMethod(soa, javaMethod, nullptr, javaArgs, 1);
78 }
79
80 mirror::Object* receiver =
81 movable ? c->AllocObject(soa.Self()) : c->AllocNonMovableObject(soa.Self());
82 if (receiver == nullptr) {
83 return nullptr;
84 }
85 jobject javaReceiver = soa.AddLocalReference<jobject>(receiver);
86 InvokeMethod(soa, javaMethod, javaReceiver, javaArgs, 1);
87 // Constructors are ()V methods, so we shouldn't touch the result of InvokeMethod.
88 return javaReceiver;
89 }
90
91 static JNINativeMethod gMethods[] = {
92 NATIVE_METHOD(Constructor, newInstance, "!([Ljava/lang/Object;)Ljava/lang/Object;"),
93 };
94
register_java_lang_reflect_Constructor(JNIEnv * env)95 void register_java_lang_reflect_Constructor(JNIEnv* env) {
96 REGISTER_NATIVE_METHODS("java/lang/reflect/Constructor");
97 }
98
99 } // namespace art
100