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 #define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))
20
jintarrayArgumentNoop(JNIEnv *,jclass,jintArray,jint)21 static void jintarrayArgumentNoop(JNIEnv*, jclass, jintArray, jint) {
22 }
23
jintarrayGetLength(JNIEnv * env,jclass,jintArray jarray)24 static jint jintarrayGetLength(JNIEnv* env, jclass, jintArray jarray) {
25 const jsize len = env->GetArrayLength(jarray);
26 return static_cast<jint>(len);
27 }
28
jintarrayCriticalAccess(JNIEnv * env,jclass,jintArray jarray,jint index)29 static jint jintarrayCriticalAccess(JNIEnv* env, jclass, jintArray jarray, jint index) {
30 const jsize len = env->GetArrayLength(jarray);
31 if (index < 0 || index >= len) {
32 return -1;
33 }
34 jint* data = (jint*) env->GetPrimitiveArrayCritical(jarray, 0);
35 jint ret = data[index];
36 env->ReleasePrimitiveArrayCritical(jarray, data, 0);
37 return ret;
38 }
39
jintarrayBasicAccess(JNIEnv * env,jclass,jintArray jarray,jint index)40 static jint jintarrayBasicAccess(JNIEnv* env, jclass, jintArray jarray, jint index) {
41 const jsize len = env->GetArrayLength(jarray);
42 if (index < 0 || index >= len) {
43 return -1;
44 }
45 jint* data = env->GetIntArrayElements(jarray, 0);
46 jint ret = data[index];
47 env->ReleaseIntArrayElements(jarray, data, 0);
48 return ret;
49 }
50
51 static const JNINativeMethod sMethods[] = {
52 {"jintarrayArgumentNoop", "([II)V", (void *) jintarrayArgumentNoop},
53 {"jintarrayGetLength", "([I)I", (void *) jintarrayGetLength},
54 {"jintarrayCriticalAccess", "([II)I", (void *) jintarrayCriticalAccess},
55 {"jintarrayBasicAccess", "([II)I", (void *) jintarrayBasicAccess},
56 };
57
registerNativeMethods(JNIEnv * env,const char * className,const JNINativeMethod * gMethods,int numMethods)58 static int registerNativeMethods(JNIEnv* env, const char* className,
59 const JNINativeMethod* gMethods, int numMethods) {
60 jclass clazz = env->FindClass(className);
61 if (clazz == NULL) {
62 return JNI_FALSE;
63 }
64 if (env->RegisterNatives(clazz, gMethods, numMethods) < 0) {
65 return JNI_FALSE;
66 }
67 return JNI_TRUE;
68 }
69
JNI_OnLoad(JavaVM * jvm,void *)70 jint JNI_OnLoad(JavaVM* jvm, void*) {
71 JNIEnv *env = NULL;
72 if (jvm->GetEnv((void**) &env, JNI_VERSION_1_6)) {
73 return JNI_ERR;
74 }
75
76 if (registerNativeMethods(env, "android/perftests/SystemPerfTest",
77 sMethods, NELEM(sMethods)) == -1) {
78 return JNI_ERR;
79 }
80
81 return JNI_VERSION_1_6;
82 }
83