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comparison graal/GraalCompiler/src/com/sun/c1x/ir/PointerOp.java @ 2509:16b9a8b5ad39

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Renamings Runtime=>GraalRuntime and Compiler=>GraalCompiler
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:50:44 +0200
parents graal/Compiler/src/com/sun/c1x/ir/PointerOp.java@9ec15d6914ca
children
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2508:fea94949e0a2 2509:16b9a8b5ad39
1 /*
2 * Copyright (c) 2010, 2010, 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.sun.c1x.value.*;
26 import com.sun.cri.ci.*;
27
28 /**
29 * The base class for pointer access operations.
30 *
31 * @author Doug Simon
32 */
33 public abstract class PointerOp extends StateSplit {
34
35 /**
36 * The kind of value at the address accessed by the pointer operation.
37 */
38 public final CiKind dataKind;
39
40 public final int opcode;
41 protected Value pointer;
42 protected Value displacement;
43 protected Value offsetOrIndex;
44 protected final boolean isVolatile;
45 final boolean isPrefetch;
46
47 /**
48 * Creates an instruction for a pointer operation. If {@code displacement != null}, the effective of the address of the operation is
49 * computed as the pointer plus a byte displacement plus a scaled index. Otherwise, the effective address is computed as the
50 * pointer plus a byte offset.
51 *
52 * @param kind the kind of value produced by this operation
53 * @param dataKind the kind of value at the address accessed by the pointer operation
54 * @param opcode the opcode of the instruction
55 * @param pointer the value producing the pointer
56 * @param displacement the value producing the displacement. This may be {@code null}.
57 * @param offsetOrIndex the value producing the scaled-index or the byte offset depending on whether {@code displacement} is {@code null}
58 * @param stateBefore the state before
59 * @param isVolatile {@code true} if the access is volatile
60 */
61 public PointerOp(CiKind kind, CiKind dataKind, int opcode, Value pointer, Value displacement, Value offsetOrIndex, FrameState stateBefore, boolean isVolatile) {
62 super(kind.stackKind(), stateBefore);
63 this.opcode = opcode;
64 this.pointer = pointer;
65 this.dataKind = dataKind;
66 this.displacement = displacement;
67 this.offsetOrIndex = offsetOrIndex;
68 this.isVolatile = isVolatile;
69 this.isPrefetch = false;
70 if (pointer.isNonNull()) {
71 eliminateNullCheck();
72 }
73 }
74
75 public Value pointer() {
76 return pointer;
77 }
78
79 public Value index() {
80 return offsetOrIndex;
81 }
82
83 public Value offset() {
84 return offsetOrIndex;
85 }
86
87 public Value displacement() {
88 return displacement;
89 }
90
91 @Override
92 public void runtimeCheckCleared() {
93 clearState();
94 }
95
96 /**
97 * Checks whether this field access may cause a trap or an exception, which
98 * is if it either requires a null check or needs patching.
99 * @return {@code true} if this field access can cause a trap
100 */
101 @Override
102 public boolean canTrap() {
103 return needsNullCheck();
104 }
105
106 /**
107 * Iterates over the input values to this instruction.
108 * @param closure the closure to apply to each value
109 */
110 @Override
111 public void inputValuesDo(ValueClosure closure) {
112 pointer = closure.apply(pointer);
113 offsetOrIndex = closure.apply(offsetOrIndex);
114 if (displacement != null) {
115 displacement = closure.apply(displacement);
116 }
117 }
118 }