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/*
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* Copyright (c) 1994, 2004, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.tools.tree;
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import sun.tools.java.*;
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import sun.tools.asm.Assembler;
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import sun.tools.asm.Label;
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import sun.tools.asm.TryData;
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import sun.tools.asm.CatchData;
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import java.io.PrintStream;
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import java.util.Hashtable;
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import java.util.Enumeration;
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/**
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* WARNING: The contents of this source file are not part of any
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* supported API. Code that depends on them does so at its own risk:
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* they are subject to change or removal without notice.
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*/
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public
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class FinallyStatement extends Statement {
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Statement body;
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Statement finalbody;
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boolean finallyCanFinish; // does finalBody never return?
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boolean needReturnSlot; // set by inner return statement
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Statement init; // try object expression or declaration from parser
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LocalMember tryTemp; // temp holding the try object, if any
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/**
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* Constructor
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*/
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public FinallyStatement(long where, Statement body, Statement finalbody) {
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super(FINALLY, where);
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this.body = body;
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this.finalbody = finalbody;
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}
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// /**
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// * Constructor for try (init) {body}
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// */
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// public FinallyStatement(long where, Statement init, Statement body, int junk) {
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// this(where, body, null);
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// this.init = init;
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// }
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/**
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* Check statement
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*/
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Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) {
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vset = reach(env, vset);
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Hashtable newexp = new Hashtable();
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// Handle the proposed 'try (init) { stmts } finally { stmts }' syntax.
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// This feature has not been adopted, and support is presently disabled.
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/*-----------------------------------------------------------*
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if (init != null) {
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ClassDefinition sourceClass = ctx.field.getClassDefinition();
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Expression tryExpr = null;
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DeclarationStatement tryDecl = null;
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long where = init.getWhere();
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// find out whether init is a simple expression or a declaration
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if (init.getOp() == EXPRESSION) {
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tryExpr = ((ExpressionStatement)init).expr;
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init = null; // restore it below
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vset = tryExpr.checkValue(env, ctx, vset, exp);
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} else if (init.getOp() == DECLARATION) {
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tryDecl = (DeclarationStatement) init;
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init = null; // restore it below
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vset = tryDecl.checkBlockStatement(env, ctx, vset, exp);
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if (tryDecl.args.length != 1) {
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env.error(where, "invalid.decl");
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} else {
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LocalMember field =
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((VarDeclarationStatement) tryDecl.args[0]).field;
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tryExpr = new IdentifierExpression(where, field);
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tryExpr.type = field.getType();
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}
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} else {
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env.error(where, "invalid.expr");
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vset = init.check(env, ctx, vset, exp);
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}
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Type type = (tryExpr == null) ? Type.tError : tryExpr.getType();
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MemberDefinition tryEnter = null;
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MemberDefinition tryExit = null;
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if (!type.isType(TC_CLASS)) {
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if (!type.isType(TC_ERROR)) {
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env.error(where, "invalid.method.invoke", type);
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}
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} else {
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Identifier idTryEnter = Identifier.lookup("tryEnter");
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Identifier idTryExit = Identifier.lookup("tryExit");
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Type tTryMethod = Type.tMethod(Type.tVoid);
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try {
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ClassDefinition tryClass = env.getClassDefinition(type);
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tryEnter = tryClass.matchMethod(env, sourceClass, idTryEnter);
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tryExit = tryClass.matchMethod(env, sourceClass, idTryExit);
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if (tryEnter != null && !tryEnter.getType().equals(tTryMethod)) {
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tryEnter = null;
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}
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if (tryExit != null && !tryExit.getType().equals(tTryMethod)) {
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tryExit = null;
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}
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} catch (ClassNotFound ee) {
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env.error(where, "class.not.found", ee.name, ctx.field);
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} catch (AmbiguousMember ee) {
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Identifier id = ee.field1.getName();
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env.error(where, "ambig.field", id, ee.field1, ee.field2);
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}
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}
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if (tryEnter == null || tryExit == null) {
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// Make a better (more didactic) error here!
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env.error(where, "invalid.method.invoke", type);
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} else {
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tryTemp = new LocalMember(where, sourceClass, 0,
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type, Identifier.lookup("<try_object>"));
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ctx = new Context(ctx, this);
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ctx.declare(env, tryTemp);
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Expression e;
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e = new IdentifierExpression(where, tryTemp);
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e = new AssignExpression(where, e, tryExpr);
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e = new MethodExpression(where, e, tryEnter, new Expression[0]);
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e.type = Type.tVoid;
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Statement enterCall = new ExpressionStatement(where, e);
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// store it on the init, for code generation
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if (tryDecl != null) {
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Statement args2[] = { tryDecl.args[0], enterCall };
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tryDecl.args = args2;
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init = tryDecl;
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} else {
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init = enterCall;
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}
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e = new IdentifierExpression(where, tryTemp);
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e = new MethodExpression(where, e, tryExit, new Expression[0]);
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e.type = Type.tVoid;
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Statement exitCall = new ExpressionStatement(where, e);
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finalbody = exitCall;
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}
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}
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*-----------------------------------------------------------*/
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// Check the try part. We reach the end of the try part either by
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// finishing normally, or doing a break to the label of the try/finally.
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// NOTE: I don't think newctx1.vsBreak is ever used -- see TryStatement.
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CheckContext newctx1 = new CheckContext(ctx, this);
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Vset vset1 = body.check(env, newctx1, vset.copy(), newexp)
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.join(newctx1.vsBreak);
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// Check the finally part.
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CheckContext newctx2 = new CheckContext(ctx, this);
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// Should never access this field. The null indicates the finally part.
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newctx2.vsContinue = null;
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Vset vset2 = finalbody.check(env, newctx2, vset, exp);
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finallyCanFinish = !vset2.isDeadEnd();
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vset2 = vset2.join(newctx2.vsBreak);
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// If !finallyCanFinish, then the only possible exceptions that can
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// occur at this point are the ones preceding the try/finally, or
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// the ones generated by the finally. Anything in the try is
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// irrelevant. Otherwise, we have to merge in all the exceptions
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// generated by the body into exp.
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if (finallyCanFinish) {
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// Add newexp's back into exp; cf. ThrowStatement.check().
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for (Enumeration e = newexp.keys() ; e.hasMoreElements() ; ) {
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Object def = e.nextElement();
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exp.put(def, newexp.get(def));
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}
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}
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return ctx.removeAdditionalVars(vset1.addDAandJoinDU(vset2));
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}
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/**
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* Inline
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*/
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public Statement inline(Environment env, Context ctx) {
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if (tryTemp != null) {
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ctx = new Context(ctx, this);
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ctx.declare(env, tryTemp);
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}
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if (init != null) {
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init = init.inline(env, ctx);
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}
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if (body != null) {
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body = body.inline(env, ctx);
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}
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if (finalbody != null) {
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finalbody = finalbody.inline(env, ctx);
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}
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if (body == null) {
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return eliminate(env, finalbody);
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}
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if (finalbody == null) {
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return eliminate(env, body);
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}
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return this;
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}
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/**
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* Create a copy of the statement for method inlining
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*/
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public Statement copyInline(Context ctx, boolean valNeeded) {
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FinallyStatement s = (FinallyStatement)clone();
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if (tryTemp != null) {
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s.tryTemp = tryTemp.copyInline(ctx);
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}
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if (init != null) {
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s.init = init.copyInline(ctx, valNeeded);
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}
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if (body != null) {
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s.body = body.copyInline(ctx, valNeeded);
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}
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if (finalbody != null) {
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s.finalbody = finalbody.copyInline(ctx, valNeeded);
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}
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return s;
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}
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/**
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* Compute cost of inlining this statement
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*/
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public int costInline(int thresh, Environment env, Context ctx){
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int cost = 4;
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if (init != null) {
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cost += init.costInline(thresh, env,ctx);
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if (cost >= thresh) return cost;
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}
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if (body != null) {
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cost += body.costInline(thresh, env,ctx);
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if (cost >= thresh) return cost;
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}
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if (finalbody != null) {
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cost += finalbody.costInline(thresh, env,ctx);
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}
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return cost;
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}
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/**
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* Code
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*/
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public void code(Environment env, Context ctx, Assembler asm) {
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ctx = new Context(ctx);
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Integer num1 = null, num2 = null;
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Label endLabel = new Label();
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if (tryTemp != null) {
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ctx.declare(env, tryTemp);
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}
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if (init != null) {
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CodeContext exprctx = new CodeContext(ctx, this);
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init.code(env, exprctx, asm);
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}
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if (finallyCanFinish) {
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LocalMember f1, f2;
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ClassDefinition thisClass = ctx.field.getClassDefinition();
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if (needReturnSlot) {
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Type returnType = ctx.field.getType().getReturnType();
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LocalMember localfield = new LocalMember(0, thisClass, 0,
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returnType,
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idFinallyReturnValue);
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ctx.declare(env, localfield);
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env.debugOutput("Assigning return slot to " + localfield.number);
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}
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// allocate space for the exception and return address
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f1 = new LocalMember(where, thisClass, 0, Type.tObject, null);
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f2 = new LocalMember(where, thisClass, 0, Type.tInt, null);
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num1 = new Integer(ctx.declare(env, f1));
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num2 = new Integer(ctx.declare(env, f2));
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}
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TryData td = new TryData();
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td.add(null);
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// Main body
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CodeContext bodyctx = new CodeContext(ctx, this);
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asm.add(where, opc_try, td); // start of protected code
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body.code(env, bodyctx, asm);
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asm.add(bodyctx.breakLabel);
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asm.add(td.getEndLabel()); // end of protected code
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// Cleanup afer body
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if (finallyCanFinish) {
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asm.add(where, opc_jsr, bodyctx.contLabel);
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asm.add(where, opc_goto, endLabel);
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} else {
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// just goto the cleanup code. It will never return.
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asm.add(where, opc_goto, bodyctx.contLabel);
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}
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// Catch code
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CatchData cd = td.getCatch(0);
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asm.add(cd.getLabel());
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if (finallyCanFinish) {
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asm.add(where, opc_astore, num1); // store exception
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asm.add(where, opc_jsr, bodyctx.contLabel);
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asm.add(where, opc_aload, num1); // rethrow exception
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asm.add(where, opc_athrow);
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} else {
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// pop exception off stack. Fall through to finally code
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asm.add(where, opc_pop);
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}
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// The finally part, which is marked by the contLabel. Update
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// breakLabel: since break's in the finally are different
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// contLabel: to null to indicate no longer in the protected code.
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asm.add(bodyctx.contLabel);
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bodyctx.contLabel = null;
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bodyctx.breakLabel = endLabel;
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if (finallyCanFinish) {
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asm.add(where, opc_astore, num2); // save the return address
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finalbody.code(env, bodyctx, asm); // execute the cleanup code
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asm.add(where, opc_ret, num2); // return
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} else {
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finalbody.code(env, bodyctx, asm); // execute the cleanup code
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}
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asm.add(endLabel); // breaks come here
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}
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/**
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* Print
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*/
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public void print(PrintStream out, int indent) {
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super.print(out, indent);
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out.print("try ");
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if (body != null) {
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body.print(out, indent);
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} else {
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out.print("<empty>");
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}
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out.print(" finally ");
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if (finalbody != null) {
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finalbody.print(out, indent);
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} else {
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out.print("<empty>");
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}
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}
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}
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