/*
* @(#)NotEqualExpression.java 1.13 95/09/14 Arthur van Hoff
*
* Copyright (c) 1994 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
package sun.tools.tree;
import sun.tools.java.*;
import sun.tools.asm.Assembler;
import sun.tools.asm.Label;
public
class NotEqualExpression extends BinaryEqualityExpression {
/**
* constructor
*/
public NotEqualExpression(int where, Expression left, Expression right) {
super(NE, where, left, right);
}
/**
* Evaluate
*/
Expression eval(int a, int b) {
return new BooleanExpression(where, a != b);
}
Expression eval(long a, long b) {
return new BooleanExpression(where, a != b);
}
Expression eval(float a, float b) {
return new BooleanExpression(where, a != b);
}
Expression eval(double a, double b) {
return new BooleanExpression(where, a != b);
}
Expression eval(boolean a, boolean b) {
return new BooleanExpression(where, a != b);
}
/**
* Simplify
*/
Expression simplify() {
if (left.isConstant() && !right.isConstant()) {
return new NotEqualExpression(where, right, left);
}
return this;
}
/**
* Code
*/
void codeBranch(Environment env, Context ctx, Assembler asm, Label lbl, boolean whenTrue) {
left.codeValue(env, ctx, asm);
switch (left.type.getTypeCode()) {
case TC_BOOLEAN:
case TC_INT:
if (!right.equals(0)) {
right.codeValue(env, ctx, asm);
asm.add(where, whenTrue ? opc_if_icmpne : opc_if_icmpeq, lbl);
return;
}
break;
case TC_LONG:
right.codeValue(env, ctx, asm);
asm.add(where, opc_lcmp);
break;
case TC_FLOAT:
right.codeValue(env, ctx, asm);
asm.add(where, opc_fcmpl);
break;
case TC_DOUBLE:
right.codeValue(env, ctx, asm);
asm.add(where, opc_dcmpl);
break;
case TC_ARRAY:
case TC_CLASS:
if (right.equals(0)) {
asm.add(where, whenTrue ? opc_ifnonnull : opc_ifnull, lbl);
} else {
right.codeValue(env, ctx, asm);
asm.add(where, whenTrue ? opc_if_acmpne : opc_if_acmpeq, lbl);
}
return;
default:
throw new CompilerError("Unexpected Type");
}
asm.add(where, whenTrue ? opc_ifne : opc_ifeq, lbl);
}
}