1 /*
2 * Copyright (C) 2018 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 "jni.h"
18
19 class ScopedUtfChars {
20 public:
ScopedUtfChars(JNIEnv * env,jstring s)21 ScopedUtfChars(JNIEnv* env, jstring s) : env_(env), string_(s) {
22 if (s == NULL) {
23 utf_chars_ = NULL;
24 } else {
25 utf_chars_ = env->GetStringUTFChars(s, NULL);
26 }
27 }
28
~ScopedUtfChars()29 ~ScopedUtfChars() {
30 if (utf_chars_) {
31 env_->ReleaseStringUTFChars(string_, utf_chars_);
32 }
33 }
34
c_str() const35 const char* c_str() const {
36 return utf_chars_;
37 }
38
39 private:
40 JNIEnv* env_;
41 jstring string_;
42 const char* utf_chars_;
43 };
44
45 extern "C" JNIEXPORT jobject JNICALL
Java_android_signature_cts_DexMemberChecker_getField_1JNI(JNIEnv * env,jclass,jclass klass,jstring name,jstring type)46 Java_android_signature_cts_DexMemberChecker_getField_1JNI(
47 JNIEnv* env, jclass, jclass klass, jstring name, jstring type) {
48 ScopedUtfChars utf_name(env, name);
49 ScopedUtfChars utf_type(env, type);
50 jfieldID fid = env->GetFieldID(klass, utf_name.c_str(), utf_type.c_str());
51 if (env->ExceptionCheck()) {
52 // GetFieldID could have thrown either NoSuchFieldError or ExceptionInInitializerError.
53 // Do not clear the exception, let Java code handle it.
54 return nullptr;
55 }
56 return env->ToReflectedField(klass, fid, /* static */ false);
57 }
58
59 extern "C" JNIEXPORT jobject JNICALL
Java_android_signature_cts_DexMemberChecker_getStaticField_1JNI(JNIEnv * env,jclass,jclass klass,jstring name,jstring type)60 Java_android_signature_cts_DexMemberChecker_getStaticField_1JNI(
61 JNIEnv* env, jclass, jclass klass, jstring name, jstring type) {
62 ScopedUtfChars utf_name(env, name);
63 ScopedUtfChars utf_type(env, type);
64 jfieldID fid = env->GetStaticFieldID(klass, utf_name.c_str(), utf_type.c_str());
65 if (env->ExceptionCheck()) {
66 // GetStaticFieldID could have thrown either NoSuchFieldError or ExceptionInInitializerError.
67 // Do not clear the exception, let Java code handle it.
68 return nullptr;
69 }
70 return env->ToReflectedField(klass, fid, /* static */ true);
71 }
72
73 extern "C" JNIEXPORT jobject JNICALL
Java_android_signature_cts_DexMemberChecker_getMethod_1JNI(JNIEnv * env,jclass,jclass klass,jstring name,jstring signature)74 Java_android_signature_cts_DexMemberChecker_getMethod_1JNI(
75 JNIEnv* env, jclass, jclass klass, jstring name, jstring signature) {
76 ScopedUtfChars utf_name(env, name);
77 ScopedUtfChars utf_signature(env, signature);
78 jmethodID mid = env->GetMethodID(klass, utf_name.c_str(), utf_signature.c_str());
79 if (env->ExceptionCheck()) {
80 // GetMethodID could have thrown either NoSuchMethodError or ExceptionInInitializerError.
81 // Do not clear the exception, let Java code handle it.
82 return nullptr;
83 }
84 return env->ToReflectedMethod(klass, mid, /* static */ false);
85 }
86
87 extern "C" JNIEXPORT jobject JNICALL
Java_android_signature_cts_DexMemberChecker_getStaticMethod_1JNI(JNIEnv * env,jclass,jclass klass,jstring name,jstring signature)88 Java_android_signature_cts_DexMemberChecker_getStaticMethod_1JNI(
89 JNIEnv* env, jclass, jclass klass, jstring name, jstring signature) {
90 ScopedUtfChars utf_name(env, name);
91 ScopedUtfChars utf_signature(env, signature);
92 jmethodID mid = env->GetStaticMethodID(klass, utf_name.c_str(), utf_signature.c_str());
93 if (env->ExceptionCheck()) {
94 // GetStaticMethodID could have thrown either NoSuchMethodError or ExceptionInInitializerError.
95 // Do not clear the exception, let Java code handle it.
96 return nullptr;
97 }
98 return env->ToReflectedMethod(klass, mid, /* static */ true);
99 }
100