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comparison graal/com.oracle.jvmci.asm/src/com/oracle/jvmci/asm/Buffer.java @ 21708:6df25b1418be

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moved com.oracle.asm.** to jvmci-util.jar (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 03 Jun 2015 18:06:44 +0200
parents graal/com.oracle.graal.asm/src/com/oracle/graal/asm/Buffer.java@5a7b82c1514e
children
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equal deleted inserted replaced
21707:e0f311284930 21708:6df25b1418be
1 /*
2 * Copyright (c) 2009, 2014, 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.util.*;
26
27 /**
28 * Code buffer management for the assembler. Support for little endian and big endian architectures
29 * is implemented using subclasses.
30 */
31 abstract class Buffer {
32
33 protected byte[] data;
34 protected int position;
35
36 public Buffer() {
37 data = new byte[AsmOptions.InitialCodeBufferSize];
38 }
39
40 public int position() {
41 return position;
42 }
43
44 public void setPosition(int position) {
45 assert position >= 0 && position <= data.length;
46 this.position = position;
47 }
48
49 /**
50 * Closes this buffer. No extra data can be written to this buffer after this call.
51 *
52 * @param trimmedCopy if {@code true}, then a copy of the underlying byte array up to (but not
53 * including) {@code position()} is returned
54 * @return the data in this buffer or a trimmed copy if {@code trimmedCopy} is {@code true}
55 */
56 public byte[] close(boolean trimmedCopy) {
57 byte[] result = trimmedCopy ? Arrays.copyOf(data, position()) : data;
58 data = null;
59 return result;
60 }
61
62 public byte[] copyData(int start, int end) {
63 if (data == null) {
64 return null;
65 }
66 return Arrays.copyOfRange(data, start, end);
67 }
68
69 /**
70 * Copies the data from this buffer into a given array.
71 *
72 * @param dst the destination array
73 * @param off starting position in {@code dst}
74 * @param len number of bytes to copy
75 */
76 public void copyInto(byte[] dst, int off, int len) {
77 System.arraycopy(data, 0, dst, off, len);
78 }
79
80 protected void ensureSize(int length) {
81 if (length >= data.length) {
82 data = Arrays.copyOf(data, length * 4);
83 }
84 }
85
86 public void emitBytes(byte[] arr, int off, int len) {
87 ensureSize(position + len);
88 System.arraycopy(arr, off, data, position, len);
89 position += len;
90 }
91
92 public void emitByte(int b) {
93 position = emitByte(b, position);
94 }
95
96 public void emitShort(int b) {
97 position = emitShort(b, position);
98 }
99
100 public void emitInt(int b) {
101 position = emitInt(b, position);
102 }
103
104 public void emitLong(long b) {
105 position = emitLong(b, position);
106 }
107
108 public int emitBytes(byte[] arr, int pos) {
109 final int len = arr.length;
110 final int newPos = pos + len;
111 ensureSize(newPos);
112 System.arraycopy(arr, 0, data, pos, len);
113 return newPos;
114 }
115
116 public int emitByte(int b, int pos) {
117 assert NumUtil.isUByte(b) || NumUtil.isByte(b);
118 int newPos = pos + 1;
119 ensureSize(newPos);
120 data[pos] = (byte) (b & 0xFF);
121 return newPos;
122 }
123
124 public abstract int emitShort(int b, int pos);
125
126 public abstract int emitInt(int b, int pos);
127
128 public abstract int emitLong(long b, int pos);
129
130 public int getByte(int pos) {
131 return data[pos] & 0xff;
132 }
133
134 public abstract int getShort(int pos);
135
136 public abstract int getInt(int pos);
137
138 public static final class BigEndian extends Buffer {
139
140 @Override
141 public int emitShort(int b, int pos) {
142 assert NumUtil.isUShort(b) || NumUtil.isShort(b);
143 int newPos = pos + 2;
144 ensureSize(pos + 2);
145 data[pos] = (byte) ((b >> 8) & 0xFF);
146 data[pos + 1] = (byte) (b & 0xFF);
147 return newPos;
148 }
149
150 @Override
151 public int emitInt(int b, int pos) {
152 int newPos = pos + 4;
153 ensureSize(newPos);
154 data[pos] = (byte) ((b >> 24) & 0xFF);
155 data[pos + 1] = (byte) ((b >> 16) & 0xFF);
156 data[pos + 2] = (byte) ((b >> 8) & 0xFF);
157 data[pos + 3] = (byte) (b & 0xFF);
158 return newPos;
159 }
160
161 @Override
162 public int emitLong(long b, int pos) {
163 int newPos = pos + 8;
164 ensureSize(newPos);
165 data[pos] = (byte) ((b >> 56) & 0xFF);
166 data[pos + 1] = (byte) ((b >> 48) & 0xFF);
167 data[pos + 2] = (byte) ((b >> 40) & 0xFF);
168 data[pos + 3] = (byte) ((b >> 32) & 0xFF);
169 data[pos + 4] = (byte) ((b >> 24) & 0xFF);
170 data[pos + 5] = (byte) ((b >> 16) & 0xFF);
171 data[pos + 6] = (byte) ((b >> 8) & 0xFF);
172 data[pos + 7] = (byte) (b & 0xFF);
173 return newPos;
174 }
175
176 @Override
177 public int getShort(int pos) {
178 return (data[pos + 0] & 0xff) << 8 | (data[pos + 1] & 0xff) << 0;
179 }
180
181 @Override
182 public int getInt(int pos) {
183 return (data[pos + 0] & 0xff) << 24 | (data[pos + 1] & 0xff) << 16 | (data[pos + 2] & 0xff) << 8 | (data[pos + 3] & 0xff) << 0;
184 }
185 }
186
187 public static final class LittleEndian extends Buffer {
188
189 @Override
190 public int emitShort(int b, int pos) {
191 assert NumUtil.isUShort(b) || NumUtil.isShort(b);
192 int newPos = pos + 2;
193 ensureSize(newPos);
194 data[pos] = (byte) (b & 0xFF);
195 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
196 return newPos;
197 }
198
199 @Override
200 public int emitInt(int b, int pos) {
201 int newPos = pos + 4;
202 ensureSize(newPos);
203 data[pos] = (byte) (b & 0xFF);
204 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
205 data[pos + 2] = (byte) ((b >> 16) & 0xFF);
206 data[pos + 3] = (byte) ((b >> 24) & 0xFF);
207 return newPos;
208 }
209
210 @Override
211 public int emitLong(long b, int pos) {
212 int newPos = pos + 8;
213 ensureSize(newPos);
214 data[pos] = (byte) (b & 0xFF);
215 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
216 data[pos + 2] = (byte) ((b >> 16) & 0xFF);
217 data[pos + 3] = (byte) ((b >> 24) & 0xFF);
218 data[pos + 4] = (byte) ((b >> 32) & 0xFF);
219 data[pos + 5] = (byte) ((b >> 40) & 0xFF);
220 data[pos + 6] = (byte) ((b >> 48) & 0xFF);
221 data[pos + 7] = (byte) ((b >> 56) & 0xFF);
222 return newPos;
223 }
224
225 @Override
226 public int getShort(int pos) {
227 return (data[pos + 1] & 0xff) << 8 | (data[pos + 0] & 0xff) << 0;
228 }
229
230 @Override
231 public int getInt(int pos) {
232 return (data[pos + 3] & 0xff) << 24 | (data[pos + 2] & 0xff) << 16 | (data[pos + 1] & 0xff) << 8 | (data[pos + 0] & 0xff) << 0;
233 }
234 }
235
236 public void reset() {
237 position = 0;
238 }
239 }