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comparison graal/GraalCompiler/src/com/sun/c1x/ir/ExceptionDispatch.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
parents
children a0dd2b907806
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2677:0ea5f12e873a 2707:7ed72769d51a
1 /*
2 * Copyright (c) 2009, 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.c1x.value.*;
28 import com.sun.cri.ci.*;
29
30 /**
31 * This instruction takes an exception object and has two successors:
32 * The catchSuccessor is called whenever the exception matches the given type, otherwise otherSuccessor is called.
33 */
34 public final class ExceptionDispatch extends BlockEnd {
35
36 private static final int INPUT_COUNT = 1;
37 private static final int INPUT_EXCEPTION = 0;
38
39 private static final int SUCCESSOR_COUNT = 0;
40
41 @Override
42 protected int inputCount() {
43 return super.inputCount() + INPUT_COUNT;
44 }
45
46 @Override
47 protected int successorCount() {
48 return super.successorCount() + SUCCESSOR_COUNT;
49 }
50
51 /**
52 * The instruction producing the exception object.
53 */
54 public Value exception() {
55 return (Value) inputs().get(super.inputCount() + INPUT_EXCEPTION);
56 }
57
58 public Value setException(Value n) {
59 return (Value) inputs().set(super.inputCount() + INPUT_EXCEPTION, n);
60 }
61
62 private final ExceptionHandler handler;
63
64 /**
65 * Constructs a new ExceptionDispatch instruction.
66 */
67 public ExceptionDispatch(Value exception, BlockBegin catchSuccessor, BlockBegin otherSuccessor, ExceptionHandler handler, FrameState stateAfter, boolean isSafepoint, Graph graph) {
68 super(CiKind.Int, stateAfter, isSafepoint, 2, INPUT_COUNT, SUCCESSOR_COUNT, graph);
69 setException(exception);
70 setBlockSuccessor(0, otherSuccessor);
71 setBlockSuccessor(1, catchSuccessor);
72 this.handler = handler;
73 }
74
75 public ExceptionHandler handler() {
76 return handler;
77 }
78
79 /**
80 * Gets the block corresponding to the catch block.
81 * @return the true successor
82 */
83 public BlockBegin catchSuccessor() {
84 return blockSuccessor(1);
85 }
86
87 /**
88 * Gets the block corresponding to the rest of the dispatch chain.
89 * @return the false successor
90 */
91 public BlockBegin otherSuccessor() {
92 return blockSuccessor(0);
93 }
94
95 /**
96 * Gets the block corresponding to the specified outcome of the branch.
97 * @param istrue {@code true} if the true successor is requested, {@code false} otherwise
98 * @return the corresponding successor
99 */
100 public BlockBegin successor(boolean istrue) {
101 return blockSuccessor(istrue ? 1 : 0);
102 }
103
104 /**
105 * Swaps the successor blocks to this if and negates the condition (e.g. == goes to !=)
106 * @see Condition#negate()
107 */
108 public void swapSuccessors() {
109 BlockBegin t = blockSuccessor(0);
110 BlockBegin f = blockSuccessor(1);
111 setBlockSuccessor(0, f);
112 setBlockSuccessor(1, t);
113 }
114
115 @Override
116 public void accept(ValueVisitor v) {
117 v.visitExceptionDispatch(this);
118 }
119
120 @Override
121 public void print(LogStream out) {
122 out.print("exception_dispatch ").
123 print(exception()).
124 print(' ').
125 print("instanceof").
126 print(' ').
127 print(handler.handler.catchType().name()).
128 print(" then B").
129 print(blockSuccessors().get(1).blockID).
130 print(" else B").
131 print(blockSuccessors().get(0).blockID);
132 if (isSafepoint()) {
133 out.print(" (safepoint)");
134 }
135 }
136
137 @Override
138 public String shortName() {
139 return "Dispatch " + handler.handler.catchType().name();
140 }
141
142
143 }