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comparison graal/Compiler/src/com/sun/c1x/ir/Intrinsic.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.*;
26 import com.sun.c1x.debug.*;
27 import com.sun.c1x.value.*;
28 import com.sun.cri.ci.*;
29 import com.sun.cri.ri.*;
30
31 /**
32 * The {@code Intrinsic} instruction represents a call to a JDK method
33 * that has been made {@linkplain C1XIntrinsic intrinsic}.
34 *
35 * @author Ben L. Titzer
36 * @see C1XIntrinsic
37 */
38 public final class Intrinsic extends StateSplit {
39
40 final C1XIntrinsic intrinsic;
41 final RiMethod target;
42 final Value[] arguments;
43 final boolean canTrap;
44
45 /**
46 * Creates a new Intrinsic instruction.
47 * @param kind the result type of the instruction
48 * @param intrinsic the actual intrinsic
49 * @param target the method for this intrinsic
50 * @param args the arguments to the call (including the receiver object)
51 * @param isStatic {@code true} if this method is static
52 * @param stateBefore the lock stack
53 * @param preservesState {@code true} if the implementation of this intrinsic preserves register state
54 * @param canTrap {@code true} if this intrinsic can cause a trap
55 */
56 public Intrinsic(CiKind kind, C1XIntrinsic intrinsic, RiMethod target, Value[] args, boolean isStatic,
57 FrameState stateBefore, boolean preservesState, boolean canTrap) {
58 super(kind, stateBefore);
59 this.intrinsic = intrinsic;
60 int nonNullArgs = 0;
61 for (int i = 0; i < args.length; ++i) {
62 if (args[i] != null) {
63 nonNullArgs++;
64 }
65 }
66 this.arguments = new Value[nonNullArgs];
67 int z = 0;
68 for (int i = 0; i < args.length; ++i) {
69 if (args[i] != null) {
70 arguments[z++] = args[i];
71 }
72 }
73 this.target = target;
74 initFlag(Flag.IsStatic, isStatic);
75 // Preserves state means that the intrinsic preserves register state across all cases,
76 // including slow cases--even if it causes a trap. If so, it can still be a candidate
77 // for load elimination and common subexpression elimination
78 initFlag(Flag.PreservesState, preservesState);
79 this.canTrap = canTrap;
80 if (!isStatic && args[0].isNonNull()) {
81 eliminateNullCheck();
82 }
83 }
84
85 /**
86 * Gets the intrinsic represented by this instruction.
87 * @return the intrinsic
88 */
89 public C1XIntrinsic intrinsic() {
90 return intrinsic;
91 }
92
93 /**
94 * Gets the target method for this invocation instruction.
95 * @return the target method
96 */
97 public RiMethod target() {
98 return target;
99 }
100
101 /**
102 * Gets the list of instructions that produce input for this instruction.
103 * @return the list of instructions that produce input
104 */
105 public Value[] arguments() {
106 return arguments;
107 }
108
109 public boolean isStatic() {
110 return checkFlag(Flag.IsStatic);
111 }
112
113 /**
114 * Checks whether this intrinsic has a receiver object.
115 * @return {@code true} if this intrinsic has a receiver object
116 */
117 public boolean hasReceiver() {
118 return !isStatic();
119 }
120
121 /**
122 * Gets the instruction which produces the receiver object for this intrinsic.
123 * @return the instruction producing the receiver object
124 */
125 public Value receiver() {
126 assert !isStatic();
127 return arguments[0];
128 }
129
130 /**
131 * Checks whether this intrinsic preserves the state of registers across all cases.
132 * @return {@code true} if this intrinsic always preserves register state
133 */
134 public boolean preservesState() {
135 return checkFlag(Flag.PreservesState);
136 }
137
138 /**
139 * Checks whether this intrinsic can cause a trap.
140 * @return {@code true} if this intrinsic can cause a trap
141 */
142 @Override
143 public boolean canTrap() {
144 return canTrap;
145 }
146
147 @Override
148 public void inputValuesDo(ValueClosure closure) {
149 for (int i = 0; i < arguments.length; i++) {
150 arguments[i] = closure.apply(arguments[i]);
151 }
152 }
153
154 @Override
155 public void accept(ValueVisitor v) {
156 v.visitIntrinsic(this);
157 }
158
159 public Value argumentAt(int i) {
160 return arguments[i];
161 }
162
163 public int numberOfArguments() {
164 return arguments.length;
165 }
166
167 @Override
168 public void print(LogStream out) {
169 out.print(intrinsic().className).print('.').print(intrinsic().name()).print('(');
170 for (int i = 0; i < arguments().length; i++) {
171 if (i > 0) {
172 out.print(", ");
173 }
174 out.print(arguments()[i]);
175 }
176 out.print(')');
177 }
178 }