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comparison graal/GraalCompiler/src/com/sun/c1x/ir/Unwind.java @ 2707:7ed72769d51a

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exception handling related changes: * changed blockPredecessors to list of Instructions, instead of Blocks * removed explicit predecessor management in BlockBegin, now using predecessors from Graph structure * replaced generated LIR exception entries with exception dispatch chains in IR * added Unwind and ExceptionDispatch instructions * removed ExceptionEntry flag in BlockBegin and all code depending on it * removed exceptionHandler list from Instruction, replaced by exception Edge on Invoke and Throw * replaced list of ExceptionHandlers with single exception edge in debug info misc: * changed GraphvizPrinter layout (smaller ports on large nodes) * removed defunct run config
author Lukas Stadler <lukas.stadler@jku.at>
date Wed, 18 May 2011 18:09:20 +0200
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children a0dd2b907806
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2677:0ea5f12e873a 2707:7ed72769d51a
1 /*
2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.sun.c1x.ir;
24
25 import com.oracle.graal.graph.*;
26 import com.sun.c1x.debug.*;
27 import com.sun.cri.ci.*;
28
29 /**
30 * Unwind takes an exception object, destroys the current stack frame and passes the exception object to the system's exception dispatch code.
31 */
32 public final class Unwind extends BlockEnd {
33
34 private static final int INPUT_COUNT = 1;
35 private static final int INPUT_EXCEPTION = 0;
36
37 private static final int SUCCESSOR_COUNT = 0;
38
39 @Override
40 protected int inputCount() {
41 return super.inputCount() + INPUT_COUNT;
42 }
43
44 @Override
45 protected int successorCount() {
46 return super.successorCount() + SUCCESSOR_COUNT;
47 }
48
49 /**
50 * The instruction that produces the exception object.
51 */
52 public Value exception() {
53 return (Value) inputs().get(super.inputCount() + INPUT_EXCEPTION);
54 }
55
56 public Value setException(Value n) {
57 assert n == null || n.kind == CiKind.Object;
58 return (Value) inputs().set(super.inputCount() + INPUT_EXCEPTION, n);
59 }
60
61 public Unwind(Value exception, boolean isSafepoint, Graph graph) {
62 super(CiKind.Object, null, isSafepoint, 0, INPUT_COUNT, SUCCESSOR_COUNT, graph);
63 setException(exception);
64 }
65
66 @Override
67 public void accept(ValueVisitor v) {
68 v.visitUnwind(this);
69 }
70
71 @Override
72 public void print(LogStream out) {
73 out.print(kind.typeChar).print("unwind ").print(exception());
74 }
75 }