com.googlecode.d2j.dex.writer.insn.JumpOp Maven / Gradle / Ivy
package com.googlecode.d2j.dex.writer.insn;
import java.nio.ByteBuffer;
import com.googlecode.d2j.dex.writer.CodeWriter;
import com.googlecode.d2j.reader.Op;
public class JumpOp extends OpInsn {
final int a;
final int b;
final Label label;
public JumpOp(Op op, int a, int b, Label label) {
super(op);
switch (op.format) {
case kFmt31t:
case kFmt21t:
CodeWriter.checkRegAA(op, "vAA", a);
break;
case kFmt22t:
CodeWriter.checkRegA(op, "vA", a);
CodeWriter.checkRegA(op, "vB", b);
break;
default:
}
this.label = label;
this.a = a;
this.b = b;
}
@Override
public void write(ByteBuffer out) {
out.put((byte) op.opcode);
int offset = label.offset - this.offset;
switch (op.format) {
case kFmt10t: // AA|op
CodeWriter.checkContentByte(op, "+AA", offset);
out.put((byte) offset);
break;
case kFmt20t: // ØØ|op AAAA
CodeWriter.checkContentShort(op, "+AAAA", offset);
out.put((byte) 0).putShort((short) offset);
break;
case kFmt30t: // ØØ|op AAAAlo AAAAhi
out.put((byte) 0).putInt(offset);
break;
case kFmt31t: // AA|op BBBBlo BBBBhi
out.put((byte) a).putInt(offset);
break;
case kFmt22t: // B|A|op CCCC
CodeWriter.checkContentShort(op, "+CCCC", offset);
out.put((byte) ((a & 0xF) | (b << 4))).putShort((short) offset);
break;
case kFmt21t: // AA|op BBBB
CodeWriter.checkContentShort(op, "+BBBB", offset);
out.put((byte) a).putShort((short) offset);
break;
default:
throw new RuntimeException("not support");
}
}
public boolean fit() {
int offset = label.offset - this.offset;
if ((op == Op.GOTO && (offset > Byte.MAX_VALUE || offset < Byte.MIN_VALUE)) ||
(op == Op.GOTO_16 && (offset > Short.MAX_VALUE || offset < Short.MIN_VALUE))
) {
if ((offset > Short.MAX_VALUE || offset < Short.MIN_VALUE)) {
op = Op.GOTO_32;
} else {
op = Op.GOTO_16;
}
return false;
}
return true;
}
}