/*

 * 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

 * particular file as subject to the "Classpath" exception as provided

 *

 * 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.

 *

 */

package sun.tools.tree;

import sun.tools.java.*;

import sun.tools.asm.Assembler;

import sun.tools.asm.LocalVariable;

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 CatchStatement extends Statement {

    int mod;

    Expression texpr;

    Identifier id;

    Statement body;

    LocalMember field;

    /**

     * Constructor

     */

    public CatchStatement(long where, Expression texpr, IdentifierToken id, Statement body) {

        super(CATCH, where);

        this.mod = id.getModifiers();

        this.texpr = texpr;

        this.id = id.getName();

        this.body = body;

    }

    /** @deprecated */

    @Deprecated

    public CatchStatement(long where, Expression texpr, Identifier id, Statement body) {

        super(CATCH, where);

        this.texpr = texpr;

        this.id = id;

        this.body = body;

    }

    /**

     * Check statement

     */

    Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) {

        vset = reach(env, vset);

        ctx = new Context(ctx, this);

        Type type = texpr.toType(env, ctx);

        try {

            if (ctx.getLocalField(id) != null) {

                env.error(where, "local.redefined", id);

            }

            if (type.isType(TC_ERROR)) {

                // error message printed out elsewhere

            } else if (!type.isType(TC_CLASS)) {

                env.error(where, "catch.not.throwable", type);

            } else {

                ClassDefinition def = env.getClassDefinition(type);

                if (!def.subClassOf(env,

                               env.getClassDeclaration(idJavaLangThrowable))) {

                    env.error(where, "catch.not.throwable", def);

                }

            }

            field = new LocalMember(where, ctx.field.getClassDefinition(), mod, type, id);

            ctx.declare(env, field);

            vset.addVar(field.number);

            return body.check(env, ctx, vset, exp);

        } catch (ClassNotFound e) {

            env.error(where, "class.not.found", e.name, opNames[op]);

            return vset;

        }

    }

    /**

     * Inline

     */

    public Statement inline(Environment env, Context ctx) {

        ctx = new Context(ctx, this);

        if (field.isUsed()) {

            ctx.declare(env, field);

        }

        if (body != null) {

            body = body.inline(env, ctx);

        }

        return this;

    }

    /**

     * Create a copy of the statement for method inlining

     */

    public Statement copyInline(Context ctx, boolean valNeeded) {

        CatchStatement s = (CatchStatement)clone();

        if (body != null) {

            s.body = body.copyInline(ctx, valNeeded);

        }

        if (field != null) {

            s.field = field.copyInline(ctx);

        }

        return s;

    }

    /**

     * Compute cost of inlining this statement

     */

    public int costInline(int thresh, Environment env, Context ctx){

        int cost = 1;

        if (body != null) {

            cost += body.costInline(thresh, env,ctx);

        }

        return cost;

    }

    /**

     * Code

     */

    public void code(Environment env, Context ctx, Assembler asm) {

        CodeContext newctx = new CodeContext(ctx, this);

        if (field.isUsed()) {

            newctx.declare(env, field);

            asm.add(where, opc_astore, new LocalVariable(field, field.number));

        } else {

            asm.add(where, opc_pop);

        }

        if (body != null) {

            body.code(env, newctx, asm);

        }

        //asm.add(newctx.breakLabel);

    }

    /**

     * Print

     */

    public void print(PrintStream out, int indent) {

        super.print(out, indent);

        out.print("catch (");

        texpr.print(out);

        out.print(" " + id + ") ");

        if (body != null) {

            body.print(out, indent);

        } else {

            out.print("<empty>");

        }

    }

}