Mercurial > hg > graal-compiler
comparison graal/com.oracle.jvmci.asm/src/com/oracle/jvmci/asm/Assembler.java @ 21708:6df25b1418be
moved com.oracle.asm.** to jvmci-util.jar (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 03 Jun 2015 18:06:44 +0200 |
parents | graal/com.oracle.graal.asm/src/com/oracle/graal/asm/Assembler.java@48c1ebd24120 |
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21707:e0f311284930 | 21708:6df25b1418be |
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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.oracle.jvmci.asm; | |
24 | |
25 import java.nio.*; | |
26 import java.util.*; | |
27 | |
28 import com.oracle.jvmci.code.*; | |
29 | |
30 /** | |
31 * The platform-independent base class for the assembler. | |
32 */ | |
33 public abstract class Assembler { | |
34 | |
35 public final TargetDescription target; | |
36 private List<LabelHint> jumpDisplacementHints; | |
37 | |
38 /** | |
39 * Backing code buffer. | |
40 */ | |
41 private final Buffer codeBuffer; | |
42 | |
43 public Assembler(TargetDescription target) { | |
44 this.target = target; | |
45 if (target.arch.getByteOrder() == ByteOrder.BIG_ENDIAN) { | |
46 this.codeBuffer = new Buffer.BigEndian(); | |
47 } else { | |
48 this.codeBuffer = new Buffer.LittleEndian(); | |
49 } | |
50 } | |
51 | |
52 /** | |
53 * Returns the current position of the underlying code buffer. | |
54 * | |
55 * @return current position in code buffer | |
56 */ | |
57 public int position() { | |
58 return codeBuffer.position(); | |
59 } | |
60 | |
61 public final void emitByte(int x) { | |
62 codeBuffer.emitByte(x); | |
63 } | |
64 | |
65 public final void emitShort(int x) { | |
66 codeBuffer.emitShort(x); | |
67 } | |
68 | |
69 public final void emitInt(int x) { | |
70 codeBuffer.emitInt(x); | |
71 } | |
72 | |
73 public final void emitLong(long x) { | |
74 codeBuffer.emitLong(x); | |
75 } | |
76 | |
77 public final void emitByte(int b, int pos) { | |
78 codeBuffer.emitByte(b, pos); | |
79 } | |
80 | |
81 public final void emitShort(int b, int pos) { | |
82 codeBuffer.emitShort(b, pos); | |
83 } | |
84 | |
85 public final void emitInt(int b, int pos) { | |
86 codeBuffer.emitInt(b, pos); | |
87 } | |
88 | |
89 public final void emitLong(long b, int pos) { | |
90 codeBuffer.emitLong(b, pos); | |
91 } | |
92 | |
93 public final int getByte(int pos) { | |
94 return codeBuffer.getByte(pos); | |
95 } | |
96 | |
97 public final int getShort(int pos) { | |
98 return codeBuffer.getShort(pos); | |
99 } | |
100 | |
101 public final int getInt(int pos) { | |
102 return codeBuffer.getInt(pos); | |
103 } | |
104 | |
105 private static final String NEWLINE = System.getProperty("line.separator"); | |
106 | |
107 /** | |
108 * Some GPU architectures have a text based encoding. | |
109 */ | |
110 public final void emitString(String x) { | |
111 emitString0("\t"); // XXX REMOVE ME pretty-printing | |
112 emitString0(x); | |
113 emitString0(NEWLINE); | |
114 } | |
115 | |
116 // XXX for pretty-printing | |
117 public final void emitString0(String x) { | |
118 codeBuffer.emitBytes(x.getBytes(), 0, x.length()); | |
119 } | |
120 | |
121 public void emitString(String s, int pos) { | |
122 codeBuffer.emitBytes(s.getBytes(), pos); | |
123 } | |
124 | |
125 /** | |
126 * Closes this assembler. No extra data can be written to this assembler after this call. | |
127 * | |
128 * @param trimmedCopy if {@code true}, then a copy of the underlying byte array up to (but not | |
129 * including) {@code position()} is returned | |
130 * @return the data in this buffer or a trimmed copy if {@code trimmedCopy} is {@code true} | |
131 */ | |
132 public byte[] close(boolean trimmedCopy) { | |
133 return codeBuffer.close(trimmedCopy); | |
134 } | |
135 | |
136 public void bind(Label l) { | |
137 assert !l.isBound() : "can bind label only once"; | |
138 l.bind(position()); | |
139 l.patchInstructions(this); | |
140 } | |
141 | |
142 public abstract void align(int modulus); | |
143 | |
144 public abstract void jmp(Label l); | |
145 | |
146 protected abstract void patchJumpTarget(int branch, int jumpTarget); | |
147 | |
148 private Map<Label, String> nameMap; | |
149 | |
150 /** | |
151 * Creates a name for a label. | |
152 * | |
153 * @param l the label for which a name is being created | |
154 * @param id a label identifier that is unique with the scope of this assembler | |
155 * @return a label name in the form of "L123" | |
156 */ | |
157 protected String createLabelName(Label l, int id) { | |
158 return "L" + id; | |
159 } | |
160 | |
161 /** | |
162 * Gets a name for a label, creating it if it does not yet exist. By default, the returned name | |
163 * is only unique with the scope of this assembler. | |
164 */ | |
165 public String nameOf(Label l) { | |
166 if (nameMap == null) { | |
167 nameMap = new HashMap<>(); | |
168 } | |
169 String name = nameMap.get(l); | |
170 if (name == null) { | |
171 name = createLabelName(l, nameMap.size()); | |
172 nameMap.put(l, name); | |
173 } | |
174 return name; | |
175 } | |
176 | |
177 /** | |
178 * This is used by the CompilationResultBuilder to convert a {@link StackSlot} to an | |
179 * {@link AbstractAddress}. | |
180 */ | |
181 public abstract AbstractAddress makeAddress(Register base, int displacement); | |
182 | |
183 /** | |
184 * Returns a target specific placeholder address that can be used for code patching. | |
185 */ | |
186 public abstract AbstractAddress getPlaceholder(); | |
187 | |
188 /** | |
189 * Emits a NOP instruction to advance the current PC. | |
190 */ | |
191 public abstract void ensureUniquePC(); | |
192 | |
193 public void reset() { | |
194 codeBuffer.reset(); | |
195 captureLabelPositions(); | |
196 } | |
197 | |
198 private void captureLabelPositions() { | |
199 if (jumpDisplacementHints == null) { | |
200 return; | |
201 } | |
202 for (LabelHint request : this.jumpDisplacementHints) { | |
203 request.capture(); | |
204 } | |
205 } | |
206 | |
207 public LabelHint requestLabelHint(Label label) { | |
208 if (jumpDisplacementHints == null) { | |
209 jumpDisplacementHints = new ArrayList<>(); | |
210 } | |
211 LabelHint hint = new LabelHint(label, position()); | |
212 this.jumpDisplacementHints.add(hint); | |
213 return hint; | |
214 } | |
215 | |
216 public InstructionCounter getInstructionCounter() { | |
217 throw new UnsupportedOperationException("Instruction counter is not implemented for " + this); | |
218 } | |
219 | |
220 public static class LabelHint { | |
221 private Label label; | |
222 private int forPosition; | |
223 private int capturedTarget = -1; | |
224 | |
225 protected LabelHint(Label label, int lastPosition) { | |
226 super(); | |
227 this.label = label; | |
228 this.forPosition = lastPosition; | |
229 } | |
230 | |
231 protected void capture() { | |
232 this.capturedTarget = label.position(); | |
233 } | |
234 | |
235 public int getTarget() { | |
236 assert isValid(); | |
237 return capturedTarget; | |
238 } | |
239 | |
240 public int getPosition() { | |
241 assert isValid(); | |
242 return forPosition; | |
243 } | |
244 | |
245 public boolean isValid() { | |
246 return capturedTarget >= 0; | |
247 } | |
248 } | |
249 | |
250 /** | |
251 * Instruction counter class which gives the user of the assembler to count different kinds of | |
252 * instructions in the generated assembler code. | |
253 */ | |
254 public interface InstructionCounter { | |
255 String[] getSupportedInstructionTypes(); | |
256 | |
257 int[] countInstructions(String[] instructionTypes, int beginPc, int endPc); | |
258 } | |
259 } |