/* * 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 * or visit www.oracle.com if you need additional information or have any * questions. */ 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. */publicclass 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(")");    }}