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andfix.cpp
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andfix.cpp
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/*
*
* Copyright (c) 2015, alipay.com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* andfix.cpp
*
* @author : sanping.li@alipay.com
*
*/
#include <jni.h>
#include <stdio.h>
#include <cassert>
#include "common.h"
#define JNIREG_CLASS "com/alipay/euler/andfix/AndFix"
//dalvik
extern jboolean dalvik_setup(JNIEnv* env, int apilevel);
extern void dalvik_replaceMethod(JNIEnv* env, jobject src, jobject dest);
extern void dalvik_setFieldFlag(JNIEnv* env, jobject field);
//art
extern jboolean art_setup(JNIEnv* env, int apilevel);
extern void art_replaceMethod(JNIEnv* env, jobject src, jobject dest);
extern void art_setFieldFlag(JNIEnv* env, jobject field);
static bool isArt;
static jboolean setup(JNIEnv* env, jclass clazz, jboolean isart,
jint apilevel) {
isArt = isart;
LOGD("vm is: %s , apilevel is: %i", (isArt ? "art" : "dalvik"),
(int )apilevel);
if (isArt) {
return art_setup(env, (int) apilevel);
} else {
return dalvik_setup(env, (int) apilevel);
}
}
static void replaceMethod(JNIEnv* env, jclass clazz, jobject src,
jobject dest) {
if (isArt) {
art_replaceMethod(env, src, dest);
} else {
dalvik_replaceMethod(env, src, dest);
}
}
static void setFieldFlag(JNIEnv* env, jclass clazz, jobject field) {
if (isArt) {
art_setFieldFlag(env, field);
} else {
dalvik_setFieldFlag(env, field);
}
}
/*
* JNI registration.
*/
static JNINativeMethod gMethods[] = {
/* name, signature, funcPtr */
{ "setup", "(ZI)Z", (void*) setup }, { "replaceMethod",
"(Ljava/lang/reflect/Method;Ljava/lang/reflect/Method;)V",
(void*) replaceMethod }, { "setFieldFlag",
"(Ljava/lang/reflect/Field;)V", (void*) setFieldFlag }, };
/*
* Register several native methods for one class.
*/
static int registerNativeMethods(JNIEnv* env, const char* className,
JNINativeMethod* gMethods, int numMethods) {
jclass clazz;
clazz = env->FindClass(className);
if (clazz == NULL) {
return JNI_FALSE;
}
if (env->RegisterNatives(clazz, gMethods, numMethods) < 0) {
return JNI_FALSE;
}
return JNI_TRUE;
}
/*
* Register native methods for all classes we know about.
*/
static int registerNatives(JNIEnv* env) {
if (!registerNativeMethods(env, JNIREG_CLASS, gMethods,
sizeof(gMethods) / sizeof(gMethods[0])))
return JNI_FALSE;
return JNI_TRUE;
}
/*
* Set some test stuff up.
*
* Returns the JNI version on success, -1 on failure.
*/
JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved) {
JNIEnv* env = NULL;
jint result = -1;
if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
return -1;
}
assert(env != NULL);
if (!registerNatives(env)) { //注册
return -1;
}
/* success -- return valid version number */
result = JNI_VERSION_1_4;
return result;
}