Mercurial > hg > truffle

annotate graal/com.oracle.graal.asm/src/com/oracle/max/asm/Buffer.java @ 6497:64b7dd2075c0

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
renamed projects com.oracle.max.asm* to com.oracle.graal.asm*
author Doug Simon <doug.simon@oracle.com>
date Wed, 03 Oct 2012 17:42:12 +0200
parents graal/com.oracle.max.asm/src/com/oracle/max/asm/Buffer.java@bc8527f3071c
children
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1 /*
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2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.max.asm;
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24
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25 import java.util.*;
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26
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27 /**
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28 * Code buffer management for the assembler. Support for little endian and big endian architectures is implemented using subclasses.
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29 */
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30 public abstract class Buffer {
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31 protected byte[] data;
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32 protected int position;
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33
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34 public Buffer() {
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35 data = new byte[AsmOptions.InitialCodeBufferSize];
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36 }
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37
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38 public void reset() {
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39 position = 0;
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40 }
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41
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42 public int position() {
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43 return position;
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44 }
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45
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46 public void setPosition(int position) {
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47 assert position >= 0 && position <= data.length;
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48 this.position = position;
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49 }
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50
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51 /**
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52 * Closes this buffer. No extra data can be written to this buffer after
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53 * this call.
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54 *
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55 * @param trimmedCopy
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56 * if {@code true}, then a copy of the underlying byte array up
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57 * to (but not including) {@code position()} is returned
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58 * @return the data in this buffer or a trimmed copy if {@code trimmedCopy}
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59 * is {@code true}
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60 */
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61 public byte[] close(boolean trimmedCopy) {
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62 byte[] result = trimmedCopy ? Arrays.copyOf(data, position()) : data;
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63 data = null;
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64 return result;
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65 }
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66
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67 public byte[] copyData(int start, int end) {
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68 return Arrays.copyOfRange(data, start, end);
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69 }
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70
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71 /**
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72 * Copies the data from this buffer into a given array.
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73 *
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74 * @param dst
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75 * the destination array
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76 * @param off
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77 * starting position in {@code dst}
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78 * @param len
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79 * number of bytes to copy
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80 */
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81 public void copyInto(byte[] dst, int off, int len) {
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82 System.arraycopy(data, 0, dst, off, len);
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83 }
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84
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85 protected void ensureSize(int length) {
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86 if (length >= data.length) {
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87 data = Arrays.copyOf(data, length * 4);
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88 }
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89 }
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90
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91 public void emitBytes(byte[] arr, int off, int len) {
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92 ensureSize(position + len);
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93 System.arraycopy(arr, off, data, position, len);
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94 position += len;
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95 }
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96
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97 public void emitByte(int b) {
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98 position = emitByte(b, position);
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99 }
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100
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101 public void emitShort(int b) {
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102 position = emitShort(b, position);
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103 }
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104
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105 public void emitInt(int b) {
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106 position = emitInt(b, position);
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107 }
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108
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109 public void emitLong(long b) {
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110 position = emitLong(b, position);
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111 }
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112
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113 public int emitByte(int b, int pos) {
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114 assert NumUtil.isUByte(b);
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115 int newPos = pos + 1;
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116 ensureSize(newPos);
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117 data[pos] = (byte) (b & 0xFF);
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118 return newPos;
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119 }
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120
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121 public abstract int emitShort(int b, int pos);
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122
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123 public abstract int emitInt(int b, int pos);
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124
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125 public abstract int emitLong(long b, int pos);
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126
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127 public int getByte(int pos) {
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128 return data[pos] & 0xff;
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129 }
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130
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131 public abstract int getShort(int pos);
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132
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133 public abstract int getInt(int pos);
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134
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135 public static final class BigEndian extends Buffer {
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136 @Override
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137 public int emitShort(int b, int pos) {
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138 assert NumUtil.isUShort(b);
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139 int newPos = pos + 2;
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140 ensureSize(pos + 2);
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141 data[pos] = (byte) ((b >> 8) & 0xFF);
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142 data[pos + 1] = (byte) (b & 0xFF);
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143 return newPos;
3733
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
144 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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145
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
146 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
147 public int emitInt(int b, int pos) {
4142
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
148 int newPos = pos + 4;
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
149 ensureSize(newPos);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
150 data[pos] = (byte) ((b >> 24) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
151 data[pos + 1] = (byte) ((b >> 16) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
152 data[pos + 2] = (byte) ((b >> 8) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
153 data[pos + 3] = (byte) (b & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
154 return newPos;
3733
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
155 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
156
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
157 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
158 public int emitLong(long b, int pos) {
4142
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
159 int newPos = pos + 8;
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
160 ensureSize(newPos);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
161 data[pos] = (byte) ((b >> 56) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
162 data[pos + 1] = (byte) ((b >> 48) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
163 data[pos + 2] = (byte) ((b >> 40) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
164 data[pos + 3] = (byte) ((b >> 32) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
165 data[pos + 4] = (byte) ((b >> 24) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
166 data[pos + 5] = (byte) ((b >> 16) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
167 data[pos + 6] = (byte) ((b >> 8) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
168 data[pos + 7] = (byte) (b & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
169 return newPos;
3733
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
170 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
171
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
172 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
173 public int getShort(int pos) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
174 return
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
175 (data[pos + 0] & 0xff) << 8 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
176 (data[pos + 1] & 0xff) << 0;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
177 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
178
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
179 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
180 public int getInt(int pos) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
181 return
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
182 (data[pos + 0] & 0xff) << 24 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
183 (data[pos + 1] & 0xff) << 16 |
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
184 (data[pos + 2] & 0xff) << 8 |
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
185 (data[pos + 3] & 0xff) << 0;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
186 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
187 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
188
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
189 public static final class LittleEndian extends Buffer {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
190 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
191 public int emitShort(int b, int pos) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
192 assert NumUtil.isUShort(b);
4142
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
193 int newPos = pos + 2;
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
194 ensureSize(newPos);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
195 data[pos] = (byte) (b & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
196 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
197 return newPos;
3733
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
198 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
199
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
200 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
201 public int emitInt(int b, int pos) {
4142
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
202 int newPos = pos + 4;
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
203 ensureSize(newPos);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
204 data[pos] = (byte) (b & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
205 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
206 data[pos + 2] = (byte) ((b >> 16) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
207 data[pos + 3] = (byte) ((b >> 24) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
208 return newPos;
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
209 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
210
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
211 @Override
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
212 public int emitLong(long b, int pos) {
4142
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
213 int newPos = pos + 8;
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
214 ensureSize(newPos);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
215 data[pos] = (byte) (b & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
216 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
217 data[pos + 2] = (byte) ((b >> 16) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
218 data[pos + 3] = (byte) ((b >> 24) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
219 data[pos + 4] = (byte) ((b >> 32) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
220 data[pos + 5] = (byte) ((b >> 40) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
221 data[pos + 6] = (byte) ((b >> 48) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
222 data[pos + 7] = (byte) ((b >> 56) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
223 return newPos;
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
224 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
225
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
226 @Override
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
227 public int getShort(int pos) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
228 return
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
229 (data[pos + 1] & 0xff) << 8 |
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
230 (data[pos + 0] & 0xff) << 0;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
231 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
232
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
233 @Override
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
234 public int getInt(int pos) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
235 return
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
236 (data[pos + 3] & 0xff) << 24 |
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
237 (data[pos + 2] & 0xff) << 16 |
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
238 (data[pos + 1] & 0xff) << 8 |
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
239 (data[pos + 0] & 0xff) << 0;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
240 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
241 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
242 }