com.sun.jdo.api.persistence.enhancer.classfile.InsnIInc Maven / Gradle / Ivy
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package com.sun.jdo.api.persistence.enhancer.classfile;
import java.io.PrintStream;
/**
* Special instruction form for the opc_iinc instruction
*/
public class InsnIInc extends Insn {
/* The local variable slot to be incremented */
private int localVarIndex;
/* The amount by which the slot is to be incremented */
private int value;
/* public accessors */
public int nStackArgs() {
return 0;
}
public int nStackResults() {
return 0;
}
/**
* What are the types of the stack operands ?
*/
public String argTypes() {
return "";//NOI18N
}
/**
* What are the types of the stack results?
*/
public String resultTypes() {
return "";//NOI18N
}
public boolean branches() {
return false;
}
/**
* The local variable slot to be incremented
*/
public int varIndex() {
return localVarIndex;
}
/**
* The amount by which the slot is to be incremented
*/
public int incrValue() {
return value;
}
/**
* Constructor for opc_iinc instruction
*/
public InsnIInc (int localVarIndex, int value) {
this(localVarIndex, value, NO_OFFSET);
}
/* package local methods */
InsnIInc (int localVarIndex, int value, int pc) {
super(opc_iinc, pc);
this.localVarIndex = localVarIndex;
this.value =value;
}
void print (PrintStream out, int indent) {
ClassPrint.spaces(out, indent);
out.println(offset() + " opc_iinc " + //NOI18N
localVarIndex + "," + value);//NOI18N
}
int store(byte[] buf, int index) {
if (isWide())
buf[index++] = (byte) opc_wide;
buf[index++] = (byte) opcode();
if (isWide()) {
index = storeShort(buf, index, (short) localVarIndex);
index = storeShort(buf, index, (short) value);
} else {
buf[index++] = (byte)localVarIndex;
buf[index++] = (byte)value;
}
return index;
}
int size() {
return isWide() ? 6 : 3;
}
private boolean isWide() {
return (value > 127 || value < -128 || localVarIndex > 255);
}
}