Mercurial > hg > truffle
comparison graal/Compiler/src/com/sun/c1x/ir/BlockEnd.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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2506:4a3bf8a5bf41 | 2507:9ec15d6914ca |
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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 java.util.*; | |
26 | |
27 import com.sun.c1x.util.*; | |
28 import com.sun.c1x.value.*; | |
29 import com.sun.cri.ci.*; | |
30 | |
31 /** | |
32 * The {@code BlockEnd} instruction is a base class for all instructions that end a basic | |
33 * block, including branches, switches, throws, and goto's. | |
34 * | |
35 * @author Ben L. Titzer | |
36 */ | |
37 public abstract class BlockEnd extends Instruction { | |
38 | |
39 BlockBegin begin; | |
40 final List<BlockBegin> successors; | |
41 FrameState stateAfter; | |
42 | |
43 /** | |
44 * Constructs a new block end with the specified value type. | |
45 * @param kind the type of the value produced by this instruction | |
46 * @param stateAfter the frame state at the end of this block | |
47 * @param isSafepoint {@code true} if this instruction is a safepoint instruction | |
48 * @param successors the list of successor blocks. If {@code null}, a new one will be created. | |
49 */ | |
50 public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint, List<BlockBegin> successors) { | |
51 super(kind); | |
52 this.successors = successors == null ? new ArrayList<BlockBegin>(2) : successors; | |
53 setStateAfter(stateAfter); | |
54 if (isSafepoint) { | |
55 setFlag(Value.Flag.IsSafepoint); | |
56 } | |
57 } | |
58 | |
59 public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint) { | |
60 this(kind, stateAfter, isSafepoint, null); | |
61 } | |
62 | |
63 /** | |
64 * Gets the state after the end of this block. | |
65 */ | |
66 @Override | |
67 public FrameState stateAfter() { | |
68 return stateAfter; | |
69 } | |
70 | |
71 public void setStateAfter(FrameState state) { | |
72 stateAfter = state; | |
73 } | |
74 | |
75 /** | |
76 * Checks whether this instruction is a safepoint. | |
77 * @return {@code true} if this instruction is a safepoint | |
78 */ | |
79 public boolean isSafepoint() { | |
80 return checkFlag(Value.Flag.IsSafepoint); | |
81 } | |
82 | |
83 /** | |
84 * Gets the block begin associated with this block end. | |
85 * @return the beginning of this basic block | |
86 */ | |
87 public BlockBegin begin() { | |
88 return begin; | |
89 } | |
90 | |
91 /** | |
92 * Sets the basic block beginning for this block end. This should only | |
93 * be called from {@link BlockBegin}. | |
94 * | |
95 * @param block the beginning of this basic block | |
96 */ | |
97 void setBegin(BlockBegin block) { | |
98 begin = block; | |
99 } | |
100 | |
101 /** | |
102 * Substitutes a successor block in this block end's successor list. Note that | |
103 * this method updates all occurrences in the list. | |
104 * @param oldSucc the old successor to replace | |
105 * @param newSucc the new successor | |
106 */ | |
107 public void substituteSuccessor(BlockBegin oldSucc, BlockBegin newSucc) { | |
108 assert newSucc != null; | |
109 Util.replaceAllInList(oldSucc, newSucc, successors); | |
110 } | |
111 | |
112 /** | |
113 * Gets the successor corresponding to the default (fall through) case. | |
114 * @return the default successor | |
115 */ | |
116 public BlockBegin defaultSuccessor() { | |
117 return successors.get(successors.size() - 1); | |
118 } | |
119 | |
120 /** | |
121 * Searches for the specified successor and returns its index into the | |
122 * successor list if found. | |
123 * @param b the block to search for in the successor list | |
124 * @return the index of the block in the list if found; <code>-1</code> otherwise | |
125 */ | |
126 public int successorIndex(BlockBegin b) { | |
127 final int max = successors.size(); | |
128 for (int i = 0; i < max; i++) { | |
129 if (successors.get(i) == b) { | |
130 return i; | |
131 } | |
132 } | |
133 return -1; | |
134 } | |
135 | |
136 /** | |
137 * Gets this block end's list of successors. | |
138 * @return the successor list | |
139 */ | |
140 public List<BlockBegin> successors() { | |
141 return successors; | |
142 } | |
143 | |
144 /** | |
145 * Gets the successor at a specified index. | |
146 * @param index the index of the successor | |
147 * @return the successor | |
148 */ | |
149 public BlockBegin suxAt(int index) { | |
150 return successors.get(index); | |
151 } | |
152 } |