问题描述
由于某种原因,我需要在asm中更改返回值。
原始代码
public int getIndex() {
index = 10;
Log.e("lmf","getIndex>>>>>>>>>>>>>begin");
Log.e("lmf","getIndex>>>>>>>>>>>>>" + index);
Log.e("lmf","getIndex>>>>>>>>>>>>>end");
return index;
}
所以我写了这个注入代码。
@Override
public void visitInsn(int opcode) {
System.out.println(">>>>>>>opcode>>>>"+opcode);
if ((opcode >= Opcodes.IRETURN && opcode <= Opcodes.RETURN) || opcode == Opcodes.ATHROW) {
mv.visitvarInsn(Opcodes.ALOAD,0);
mv.visitMethodInsn(Opcodes.INVOKESTATIC,"com/didi/global/Mocklocation/TargetLocationHelper","fakeTarget","(Lcom/didi/global/Mocklocation/TargetLocation;)V",false);
}
super.visitInsn(opcode);
}
然后我得到了
public int getIndex() {
this.index = 10;
Log.e("lmf","getIndex>>>>>>>>>>>>>" + this.index);
Log.e("lmf","getIndex>>>>>>>>>>>>>end");
//I don't kNow,why this code appears. Because this I can't change the return value.
int var10000 = this.index;
//this is My inject code
TargetLocationHelper.fakeTarget(this);
return var10000;
}
如何避免int var10000 = this.index;
出现?为何出现此代码?
最后,如何更改asm中的返回值?
解决方法
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