/*
* @(#)CatchStatement.java 1.22 95/11/22 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.LocalVariable;
import sun.tools.asm.Label;
import java.io.PrintStream;
import java.util.Hashtable;
public
class CatchStatement extends Statement {
Expression texpr;
Identifier id;
Statement body;
LocalField field;
/**
* Constructor
*/
public CatchStatement(int where, Expression texpr, Identifier id, Statement body) {
super(CATCH, where);
this.texpr = texpr;
this.id = id;
this.body = body;
}
/**
* Check statement
*/
long check(Environment env, Context ctx, long vset, Hashtable exp) {
vset = reach(env, vset);
ctx = new Context(ctx, this);
Type type = texpr.toType(env, ctx);
try {
env.resolve(where, ctx.field.getClassDefinition(), type);
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 LocalField(where, ctx.field.getClassDefinition(), 0, type, id);
ctx.declare(env, field);
vset |= (long)1 << 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);
}
return s;
}
/**
* 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>");
}
}
}