SystemPerfTest.cpp revision b2264c2bc5af19b53edc4708b5b86743f91ae8aa 
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
21static void jintarrayArgumentNoop(JNIEnv*, jclass, jintArray, jint) {
22}
23
24static jint jintarrayGetLength(JNIEnv* env, jclass, jintArray jarray) {
25    const jsize len = env->GetArrayLength(jarray);
26    return static_cast<jint>(len);
27}
28
29static 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
40static 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
51static 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
58static 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
70jint 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, "java/lang/perftests/SystemPerfTest",
77            sMethods, NELEM(sMethods)) == -1) {
78        return JNI_ERR;
79    }
80
81    return JNI_VERSION_1_6;
82}
83