1 /*
2 * Copyright (C) 2016 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 namespace {
20
21 bool g_jni_onload_called = false;
22
add42(JNIEnv *,jclass,jint x)23 jint add42(JNIEnv* /* env */, jclass /* clazz */, jint x) {
24 return x + 42;
25 }
26
27 } // namespace
28
29 extern "C" {
30
JNI_OnLoad(JavaVM *,void *)31 jint JNI_OnLoad(JavaVM* /* vm */, void* /* reserved */) {
32 g_jni_onload_called = true;
33 return JNI_VERSION_1_6;
34 }
35
Java_com_berberis_jnitests_JniTests_intFromJNI(JNIEnv *,jclass)36 JNIEXPORT jint JNICALL Java_com_berberis_jnitests_JniTests_intFromJNI(JNIEnv* /* env */,
37 jclass /* clazz */) {
38 return 42;
39 }
40
41 JNIEXPORT jboolean JNICALL
Java_com_berberis_jnitests_JniTests_isJNIOnLoadCalled(JNIEnv *,jclass)42 Java_com_berberis_jnitests_JniTests_isJNIOnLoadCalled(JNIEnv* /* env */, jclass /* clazz */) {
43 return g_jni_onload_called;
44 }
45
Java_com_berberis_jnitests_JniTests_checkGetVersion(JNIEnv * env,jclass)46 JNIEXPORT jboolean JNICALL Java_com_berberis_jnitests_JniTests_checkGetVersion(JNIEnv* env,
47 jclass /* clazz */) {
48 return env->GetVersion() == JNI_VERSION_1_6;
49 }
50
51 JNIEXPORT jboolean JNICALL
Java_com_berberis_jnitests_JniTests_checkJavaVMCorrespondsToJNIEnv(JNIEnv * env,jclass)52 Java_com_berberis_jnitests_JniTests_checkJavaVMCorrespondsToJNIEnv(JNIEnv* env,
53 jclass /* clazz */) {
54 JavaVM* vm;
55 if (env->GetJavaVM(&vm) != JNI_OK) {
56 return false;
57 }
58
59 void* env_copy;
60 if (vm->GetEnv(&env_copy, JNI_VERSION_1_6) != JNI_OK) {
61 return false;
62 }
63
64 return env == env_copy;
65 }
66
Java_com_berberis_jnitests_JniTests_callRegisterNatives(JNIEnv * env,jclass clazz)67 JNIEXPORT jboolean JNICALL Java_com_berberis_jnitests_JniTests_callRegisterNatives(JNIEnv* env,
68 jclass clazz) {
69 JNINativeMethod methods[] = {{"add42", "(I)I", reinterpret_cast<void*>(&add42)}};
70 return env->RegisterNatives(clazz, methods, sizeof(methods) / sizeof(methods[1])) == JNI_OK;
71 }
72
Java_com_berberis_jnitests_JniTests_callAdd(JNIEnv * env,jclass clazz,jint x,jint y)73 JNIEXPORT jint JNICALL Java_com_berberis_jnitests_JniTests_callAdd(JNIEnv* env,
74 jclass clazz,
75 jint x,
76 jint y) {
77 jmethodID method_id = env->GetStaticMethodID(clazz, "add", "(II)I");
78 // ATTENTION: JNIEnv converts Call*Method(...) to Call*MethodV(va_list)!
79 return env->CallStaticIntMethod(clazz, method_id, x, y);
80 }
81
Java_com_berberis_jnitests_JniTests_callAddA(JNIEnv * env,jclass clazz,jint x,jint y)82 JNIEXPORT jint JNICALL Java_com_berberis_jnitests_JniTests_callAddA(JNIEnv* env,
83 jclass clazz,
84 jint x,
85 jint y) {
86 jmethodID method_id = env->GetStaticMethodID(clazz, "add", "(II)I");
87 jvalue args[2];
88 args[0].i = x;
89 args[1].i = y;
90 return env->CallStaticIntMethodA(clazz, method_id, args);
91 }
92
Java_com_berberis_jnitests_JniTests_callCallIntFromJNI(JNIEnv * env,jclass clazz)93 JNIEXPORT jint JNICALL Java_com_berberis_jnitests_JniTests_callCallIntFromJNI(JNIEnv* env,
94 jclass clazz) {
95 jmethodID method_id = env->GetStaticMethodID(clazz, "callIntFromJNI", "()I");
96 return env->CallStaticIntMethod(clazz, method_id);
97 }
98
99 } // extern "C"
100