1 /*
2 * Copyright 2023 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 #include <android/log.h>
19
20 #define LOG(MSG) __android_log_write(ANDROID_LOG_DEBUG, "BENCHMARK", MSG)
21
22 extern "C" {
23
consumeByte(__unused jbyte value)24 static void JNICALL consumeByte(__unused jbyte value) {}
consumeShort(__unused jshort value)25 static void JNICALL consumeShort(__unused jshort value) {}
consumeInt(__unused jint value)26 static void JNICALL consumeInt(__unused jint value) {}
consumeLong(__unused jlong value)27 static void JNICALL consumeLong(__unused jlong value) {}
consumeFloat(__unused jfloat value)28 static void JNICALL consumeFloat(__unused jfloat value) {}
consumeDouble(__unused jdouble value)29 static void JNICALL consumeDouble(__unused jdouble value) {}
consumeBoolean(__unused jboolean value)30 static void JNICALL consumeBoolean(__unused jboolean value) {}
consumeChar(__unused jchar value)31 static void JNICALL consumeChar(__unused jchar value) {}
consumeObject(JNIEnv * env,__unused jclass clazz,__unused jobject value)32 static void JNICALL consumeObject(
33 JNIEnv *env,
34 __unused jclass clazz,
35 __unused jobject value
36 ) {}
37
38 }
39
40 static JNINativeMethod sMethods[] = {
41 {"consume",
42 "(B)V", // byte
43 reinterpret_cast<void *>(consumeByte)
44 },
45 {"consume",
46 "(S)V", // short
47 reinterpret_cast<void *>(consumeShort)
48 },
49 {"consume",
50 "(I)V", // int
51 reinterpret_cast<void *>(consumeInt)
52 },
53 {"consume",
54 "(J)V", // long
55 reinterpret_cast<void *>(consumeLong)
56 },
57 {"consume",
58 "(F)V", // float
59 reinterpret_cast<void *>(consumeFloat)
60 },
61 {"consume",
62 "(D)V", // double
63 reinterpret_cast<void *>(consumeDouble)
64 },
65 {"consume",
66 "(Z)V", // boolean
67 reinterpret_cast<void *>(consumeBoolean)
68 },
69 {"consume",
70 "(C)V", // char
71 reinterpret_cast<void *>(consumeChar)
72 },
73 {"consume",
74 "(Ljava/lang/Object;)V",
75 reinterpret_cast<void *>(consumeObject)
76 },
77 };
78
JNI_OnLoad(JavaVM * vm,void *)79 jint JNI_OnLoad(JavaVM *vm, void * /* reserved */) {
80 JNIEnv *env = nullptr;
81 if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6)) {
82 LOG("JNI_OnLoad failure when trying to register native methods for BlackHole.");
83 return JNI_ERR;
84 }
85 jclass clazz = env->FindClass("androidx/benchmark/BlackHole");
86 if (clazz == nullptr) {
87 LOG("Cannot find BlackHole class when trying to register native methods.");
88 return JNI_ERR;
89 }
90
91 const int methodCount = sizeof(sMethods) / sizeof(sMethods[0]);
92 int result = env->RegisterNatives(clazz, sMethods, methodCount);
93 env->DeleteLocalRef(clazz);
94
95 if (result != 0) {
96 LOG("Failure when trying to call RegisterNatives to register native BlackHole methods.");
97 return JNI_ERR;
98 }
99
100 return JNI_VERSION_1_6;
101 }