// Copyright (c) 2003-2014, Jodd Team (jodd.org). All Rights Reserved.
package jodd.proxetta.asm;
import jodd.asm.MethodAdapter;
import jodd.asm5.MethodVisitor;
import jodd.asm5.Label;
import static jodd.asm5.Opcodes.*;
import jodd.proxetta.ProxettaException;
/**
* Method adapter that remembers previous opcode of 'insn' and 'intInsn' instructions.
* Used to detect single (last) int argument value of a method call.
*/
abstract class IntArgHistoryMethodAdapter extends MethodAdapter {
protected IntArgHistoryMethodAdapter(MethodVisitor methodVisitor) {
super(methodVisitor);
}
// ---------------------------------------------------------------- history
protected int opcode;
protected int operand;
protected boolean isPrevious; // true only if previous opcode is of the correct type
protected boolean traceNext; // true only to trace very next opcode
// ---------------------------------------------------------------- get index
/**
* Returns argument index from the history.
* <b>Must</b> POP value from the stack after the execution.
*/
protected int getArgumentIndex() {
if (isPrevious == false) {
throw new ProxettaException("Unexpected previous instruction type used for setting argument index");
}
int argIndex;
switch (opcode) {
case ICONST_0: argIndex = 0; break;
case ICONST_1: argIndex = 1; break;
case ICONST_2: argIndex = 2; break;
case ICONST_3: argIndex = 3; break;
case ICONST_4: argIndex = 4; break;
case ICONST_5: argIndex = 5; break;
case BIPUSH:
case SIPUSH:
argIndex = operand; break;
default:
throw new ProxettaException("Unexpected previous instruction used for setting argument index");
}
return argIndex;
}
// ---------------------------------------------------------------- visitors
@Override
public void visitInsn(int opcode) {
this.opcode = opcode;
isPrevious = true;
traceNext = false;
super.visitInsn(opcode);
}
@Override
public void visitIntInsn(int opcode, int operand) {
this.opcode = opcode;
this.operand = operand;
isPrevious = true;
traceNext = false;
super.visitIntInsn(opcode, operand);
}
@Override
public void visitVarInsn(int opcode, int var) {
isPrevious = false;
traceNext = false;
super.visitVarInsn(opcode, var);
}
@Override
public void visitTypeInsn(int opcode, String type) {
isPrevious = false;
traceNext = false;
super.visitTypeInsn(opcode, type);
}
@Override
public void visitFieldInsn(int opcode, String owner, String name, String desc) {
isPrevious = false;
traceNext = false;
super.visitFieldInsn(opcode, owner, name, desc);
}
@Override
public void visitMethodInsn(int opcode, String owner, String name, String desc) {
isPrevious = false;
traceNext = false;
super.visitMethodInsn(opcode, owner, name, desc);
}
@Override
public void visitJumpInsn(int opcode, Label label) {
isPrevious = false;
traceNext = false;
super.visitJumpInsn(opcode, label);
}
@Override
public void visitLdcInsn(Object cst) {
isPrevious = false;
traceNext = false;
super.visitLdcInsn(cst);
}
@Override
public void visitIincInsn(int var, int increment) {
isPrevious = false;
traceNext = false;
super.visitIincInsn(var, increment);
}
@Override
public void visitTableSwitchInsn(int min, int max, Label dflt, Label[] labels) {
isPrevious = false;
traceNext = false;
super.visitTableSwitchInsn(min, max, dflt, labels);
}
@Override
public void visitLookupSwitchInsn(Label dflt, int[] keys, Label[] labels) {
isPrevious = false;
traceNext = false;
super.visitLookupSwitchInsn(dflt, keys, labels);
}
@Override
public void visitMultiANewArrayInsn(String desc, int dims) {
isPrevious = false;
traceNext = false;
super.visitMultiANewArrayInsn(desc, dims);
}
@Override
public void visitLocalVariable(String name, String desc, String signature, Label start, Label end, int index) {
}
@Override
public void visitLineNumber(int line, Label start) {
}
}