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public class

InstanceOfExpression

extends BinaryExpression
/*
 * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */


package sun.tools.tree;

import sun.tools.java.*;
import sun.tools.asm.Assembler;
import sun.tools.asm.Label;
import java.io.PrintStream;
import java.util.Hashtable;

/**
 * WARNING: The contents of this source file are not part of any
 * supported API.  Code that depends on them does so at its own risk:
 * they are subject to change or removal without notice.
 */

public
class InstanceOfExpression extends BinaryExpression {
   
/**
     * constructor
     */

   
public InstanceOfExpression(long where, Expression left, Expression right) {
       
super(INSTANCEOF, where, Type.tBoolean, left, right);
   
}

   
/**
     * Check the expression
     */

   
public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) {
        vset
= left.checkValue(env, ctx, vset, exp);
        right
= new TypeExpression(right.where, right.toType(env, ctx));

       
if (right.type.isType(TC_ERROR) || left.type.isType(TC_ERROR)) {
           
// An error was already reported
           
return vset;
       
}

       
if (!right.type.inMask(TM_CLASS|TM_ARRAY)) {
            env
.error(right.where, "invalid.arg.type", right.type, opNames[op]);
           
return vset;
       
}
       
try {
           
if (!env.explicitCast(left.type, right.type)) {
                env
.error(where, "invalid.instanceof", left.type, right.type);
           
}
       
} catch (ClassNotFound e) {
            env
.error(where, "class.not.found", e.name, opNames[op]);
       
}
       
return vset;
   
}

   
/**
     * Inline
     */

   
public Expression inline(Environment env, Context ctx) {
       
return left.inline(env, ctx);
   
}
   
public Expression inlineValue(Environment env, Context ctx) {
        left
= left.inlineValue(env, ctx);
       
return this;
   
}

   
public int costInline(int thresh, Environment env, Context ctx) {
       
if (ctx == null) {
           
return 1 + left.costInline(thresh, env, ctx);
       
}
       
// sourceClass is the current class trying to inline this method
       
ClassDefinition sourceClass = ctx.field.getClassDefinition();
       
try {
           
// We only allow the inlining if the current class can access
           
// the "instance of" class
           
if (right.type.isType(TC_ARRAY) ||
                 sourceClass
.permitInlinedAccess(env, env.getClassDeclaration(right.type)))
               
return 1 + left.costInline(thresh, env, ctx);
       
} catch (ClassNotFound e) {
       
}
       
return thresh;
   
}




   
/**
     * Code
     */

   
public void codeValue(Environment env, Context ctx, Assembler asm) {
        left
.codeValue(env, ctx, asm);
       
if (right.type.isType(TC_CLASS)) {
           
asm.add(where, opc_instanceof, env.getClassDeclaration(right.type));
       
} else {
           
asm.add(where, opc_instanceof, right.type);
       
}
   
}
   
void codeBranch(Environment env, Context ctx, Assembler asm, Label lbl, boolean whenTrue) {
        codeValue
(env, ctx, asm);
       
asm.add(where, whenTrue ? opc_ifne : opc_ifeq, lbl, whenTrue);
   
}
   
public void code(Environment env, Context ctx, Assembler asm) {
        left
.code(env, ctx, asm);
   
}

   
/**
     * Print
     */

   
public void print(PrintStream out) {
       
out.print("(" + opNames[op] + " ");
        left
.print(out);
       
out.print(" ");
       
if (right.op == TYPE) {
           
out.print(right.type.toString());
       
} else {
            right
.print(out);
       
}
       
out.print(")");
   
}
}