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comparison graal/Compiler/src/com/sun/c1x/ir/IRScope.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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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 com.sun.c1x.value.*;
26 import com.sun.cri.ci.*;
27 import com.sun.cri.ri.*;
28
29 /**
30 * The {@code IRScope} class represents an inlining context in the compilation
31 * of a method.
32 *
33 * @author Ben L. Titzer
34 */
35 public class IRScope {
36
37 public final IRScope caller;
38 public final RiMethod method;
39 public final int level;
40 CiCodePos callerCodePos;
41
42 /**
43 * The frame state at the call site of this scope's caller or {@code null}
44 * if this is not a nested scope.
45 */
46 public final FrameState callerState;
47
48 /**
49 * The maximum number of locks held in this scope at any one time
50 * (c.f. maxStack and maxLocals of the Code attribute in a class file).
51 */
52 int maxLocks;
53
54 CiBitMap storesInLoops;
55
56 public IRScope(IRScope caller, FrameState callerState, RiMethod method, int osrBCI) {
57 this.caller = caller;
58 this.callerState = callerState;
59 this.method = method;
60 this.level = caller == null ? 0 : 1 + caller.level;
61 }
62
63 /**
64 * Updates the maximum number of locks held in this scope at any one time.
65 *
66 * @param locks a lock count that will replace the current {@linkplain #maxLocks() max locks} for this scope if it is greater
67 */
68 public void updateMaxLocks(int locks) {
69 if (locks > maxLocks) {
70 maxLocks = locks;
71 }
72 }
73
74 /**
75 * Gets the number of locks in this IR scope.
76 * @return the number of locks
77 */
78 public final int maxLocks() {
79 return maxLocks;
80 }
81
82 /**
83 * Gets the bytecode index of the call site that called this method.
84 * @return the call site's bytecode index
85 */
86 public final int callerBCI() {
87 return callerState == null ? -1 : callerState.bci;
88 }
89
90 /**
91 * Returns whether this IR scope is the top scope (i.e. has no caller).
92 * @return {@code true} if this inlining scope has no parent
93 */
94 public final boolean isTopScope() {
95 return caller == null;
96 }
97
98 /**
99 * Gets the phi bitmap for this IR scope. The phi bitmap stores
100 * whether a phi instruction is required for each local variable.
101 * @return the phi bitmap for this IR scope
102 */
103 public final CiBitMap getStoresInLoops() {
104 return storesInLoops;
105 }
106
107 public final void setStoresInLoops(CiBitMap storesInLoops) {
108 this.storesInLoops = storesInLoops;
109 }
110
111 @Override
112 public String toString() {
113 if (caller == null) {
114 return "root-scope: " + method;
115 } else {
116 return "inlined-scope: " + method + " [caller bci: " + callerState.bci + "]";
117 }
118 }
119
120 public CiCodePos callerCodePos() {
121 if (caller != null && callerCodePos == null) {
122 callerCodePos = caller.toCodePos(callerBCI());
123 }
124 return callerCodePos;
125 }
126
127 public CiCodePos toCodePos(int bci) {
128 return new CiCodePos(callerCodePos(), method, bci);
129 }
130 }