C++ (Cpp) dvmDecodeIndirectRef_fnPtr Examples

Example #1

File: dalvik_method_replace.cpp Project: CtrlSmart/HotFixDemo

extern void __attribute__ ((visibility ("hidden"))) dalvik_replaceMethod(
		JNIEnv* env, jobject src, jobject dest) {
	jobject clazz = env->CallObjectMethod(dest, jClassMethod);
	ClassObject* clz = (ClassObject*) dvmDecodeIndirectRef_fnPtr(
			dvmThreadSelf_fnPtr(), clazz);
	clz->status = CLASS_INITIALIZED;

	Method* meth = (Method*) env->FromReflectedMethod(src);
	Method* target = (Method*) env->FromReflectedMethod(dest);
	LOGD("dalvikMethod: %s", meth->name);

	meth->jniArgInfo = 0x80000000;
	meth->accessFlags |= ACC_NATIVE;

	int argsSize = dvmComputeMethodArgsSize_fnPtr(meth);
	if (!dvmIsStaticMethod(meth))
		argsSize++;
	meth->registersSize = meth->insSize = argsSize;
	meth->insns = (void*) target;//在Dalvik中，每个方法都是一个Method的结构体，其中当这个方法是native的时候，Method的insns这个指针会指向native方法的起始地址。

	meth->nativeFunc = dalvik_dispatcher;
}

Example #2

File: dalvik_method_replace.cpp Project: 127001david/AndFix

extern void __attribute__ ((visibility ("hidden"))) dalvik_replaceMethod(
		JNIEnv* env, jobject src, jobject dest) {
	jobject clazz = env->CallObjectMethod(dest, jClassMethod);
	ClassObject* clz = (ClassObject*) dvmDecodeIndirectRef_fnPtr(
			dvmThreadSelf_fnPtr(), clazz);
	clz->status = CLASS_INITIALIZED;

	Method* meth = (Method*) env->FromReflectedMethod(src);
	Method* target = (Method*) env->FromReflectedMethod(dest);
	LOGD("dalvikMethod: %s", meth->name);

	meth->clazz = target->clazz;
	meth->accessFlags |= ACC_PUBLIC;
	meth->methodIndex = target->methodIndex;
	meth->jniArgInfo = target->jniArgInfo;
	meth->registersSize = target->registersSize;
	meth->outsSize = target->outsSize;
	meth->insSize = target->insSize;

	meth->prototype = target->prototype;
	meth->insns = target->insns;
	meth->nativeFunc = target->nativeFunc;
}