/* * 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 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 ThrowStatement extends Statement {    Expression expr;     /**     * Constructor     */    public ThrowStatement(long where, Expression expr) {        super(THROW, where);        this.expr = expr;    }     /**     * Check statement     */    Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) {        checkLabel(env, ctx);        try {            vset = reach(env, vset);            expr.checkValue(env, ctx, vset, exp);            if (expr.type.isType(TC_CLASS)) {                ClassDeclaration c = env.getClassDeclaration(expr.type);                if (exp.get(c) == null) {                    exp.put(c, this);                }                ClassDefinition def = c.getClassDefinition(env);                ClassDeclaration throwable =                    env.getClassDeclaration(idJavaLangThrowable);                if (!def.subClassOf(env, throwable)) {                    env.error(where, "throw.not.throwable", def);                }                expr = convert(env, ctx, Type.tObject, expr);            } else if (!expr.type.isType(TC_ERROR)) {                env.error(expr.where, "throw.not.throwable", expr.type);            }        } catch (ClassNotFound e) {            env.error(where, "class.not.found", e.name, opNames[op]);        }        CheckContext exitctx = ctx.getTryExitContext();        if (exitctx != null) {            exitctx.vsTryExit = exitctx.vsTryExit.join(vset);        }        return DEAD_END;    }     /**     * Inline     */    public Statement inline(Environment env, Context ctx) {        expr = expr.inlineValue(env, ctx);        return this;    }     /**     * Create a copy of the statement for method inlining     */    public Statement copyInline(Context ctx, boolean valNeeded) {        ThrowStatement s = (ThrowStatement)clone();        s.expr = expr.copyInline(ctx);        return s;    }     /**     * The cost of inlining this statement     */    public int costInline(int thresh, Environment env, Context ctx) {        return 1 + expr.costInline(thresh, env, ctx);    }     /**     * Code     */    public void code(Environment env, Context ctx, Assembler asm) {        expr.codeValue(env, ctx, asm);        asm.add(where, opc_athrow);    }     /**     * Print     */    public void print(PrintStream out, int indent) {        super.print(out, indent);        out.print("throw ");        expr.print(out);        out.print(":");    }}