Mercurial > hg > graal-compiler

annotate graal/GraalCompiler/src/com/sun/c1x/asm/Buffer.java @ 2547:b6cd17226aad

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Clean up C1XMetrics.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 21:56:38 +0200
parents 16b9a8b5ad39
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2507
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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.sun.c1x.asm;
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24
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25 import java.util.*;
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26
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27 import com.sun.c1x.*;
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28 import com.sun.cri.bytecode.*;
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29 import com.sun.cri.ci.CiArchitecture.ByteOrder;
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30
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31 /**
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32 *
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33 * @author Thomas Wuerthinger
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34 */
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35 public final class Buffer {
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36
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37 private byte[] data;
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38 private int position;
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39 private int mark = -1;
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40
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41 private final ByteOrder byteOrder;
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42
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43 public Buffer(ByteOrder byteOrder) {
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44 this.byteOrder = byteOrder;
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45 this.data = new byte[C1XOptions.InitialCodeBufferSize];
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46 }
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47
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48 public void reset() {
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49 position = 0;
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50 mark = -1;
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51 }
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52
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53 /**
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54 * Closes this buffer. No extra data can be written to this buffer after this call.
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55 *
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56 * @param trimmedCopy if {@code true}, then a copy of the underlying byte array up to (but not including)
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57 * {@code position()} is returned
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58 * @return the data in this buffer or a trimmed copy if {@code trimmedCopy} is {@code true}
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59 */
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60 public byte[] close(boolean trimmedCopy) {
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61 byte[] result = trimmedCopy ? Arrays.copyOf(data, position()) : data;
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62 data = null;
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63 return result;
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64 }
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65
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66 public int emitBytes(byte[] arr, int off, int len) {
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67 assert data != null : "must not use buffer after calling finished!";
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68 int oldPos = position;
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69 ensureSize(position + len);
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70 System.arraycopy(arr, off, data, position, len);
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71 position += len;
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72 return oldPos;
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73 }
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74
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75 public int emitByte(int b) {
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76 int oldPos = position;
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77 position = emitByte(b, oldPos);
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78 return oldPos;
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79 }
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80
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81 public int emitShort(int b) {
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82 int oldPos = position;
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83 position = emitShort(b, oldPos);
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84 return oldPos;
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85 }
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86
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87 public int emitInt(int b) {
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88 int oldPos = position;
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89 position = emitInt(b, oldPos);
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90 return oldPos;
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91 }
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92
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93 public int emitLong(long b) {
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94 int oldPos = position;
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95 position = emitLong(b, oldPos);
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96 return oldPos;
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97 }
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98
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99 private boolean isByte(int b) {
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100 return b == (b & 0xFF);
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101 }
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102
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103 private boolean isShort(int s) {
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104 return s == (s & 0xFFFF);
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105 }
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106
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107 /**
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108 * Places a bookmark at the {@linkplain #position() current position}.
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109 *
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110 * @return the previously placed bookmark or {@code -1} if there was no bookmark
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111 */
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112 public int mark() {
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113 int mark = this.mark;
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114 this.mark = position;
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115 return mark;
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116 }
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117
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118 private void ensureSize(int length) {
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119 if (length >= data.length) {
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120 data = Arrays.copyOf(data, data.length * 4);
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121 C1XMetrics.CodeBufferCopies++;
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122 }
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123 }
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124
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125 public int emitByte(int b, int pos) {
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126 assert data != null : "must not use buffer after calling finished!";
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127 assert isByte(b);
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128 ensureSize(pos + 1);
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129 data[pos++] = (byte) b;
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130 return pos;
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131 }
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132
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133 public int emitShort(int b, int pos) {
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134 assert data != null : "must not use buffer after calling finished!";
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135 assert isShort(b);
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136 ensureSize(pos + 2);
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137 if (byteOrder == ByteOrder.BigEndian) {
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138 data[pos++] = (byte) ((b >> 8) & 0xFF);
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139 data[pos++] = (byte) (b & 0xFF);
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140
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141 } else {
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142 assert byteOrder == ByteOrder.LittleEndian;
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143 data[pos++] = (byte) (b & 0xFF);
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144 data[pos++] = (byte) ((b >> 8) & 0xFF);
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145 }
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146 return pos;
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147 }
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148
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149 public int emitInt(int b, int pos) {
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150 assert data != null : "must not use buffer after calling finished!";
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151 ensureSize(pos + 4);
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152 if (byteOrder == ByteOrder.BigEndian) {
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153 data[pos++] = (byte) ((b >> 24) & 0xFF);
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154 data[pos++] = (byte) ((b >> 16) & 0xFF);
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155 data[pos++] = (byte) ((b >> 8) & 0xFF);
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156 data[pos++] = (byte) (b & 0xFF);
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157 } else {
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158 assert byteOrder == ByteOrder.LittleEndian;
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159 data[pos++] = (byte) (b & 0xFF);
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160 data[pos++] = (byte) ((b >> 8) & 0xFF);
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161 data[pos++] = (byte) ((b >> 16) & 0xFF);
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162 data[pos++] = (byte) ((b >> 24) & 0xFF);
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163 }
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164 return pos;
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165 }
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166
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167 public int emitLong(long b, int pos) {
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168 assert data != null : "must not use buffer after calling finished!";
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169 ensureSize(pos + 8);
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170
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171 if (byteOrder == ByteOrder.BigEndian) {
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172 data[pos++] = (byte) ((b >> 56) & 0xFF);
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173 data[pos++] = (byte) ((b >> 48) & 0xFF);
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174 data[pos++] = (byte) ((b >> 40) & 0xFF);
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175 data[pos++] = (byte) ((b >> 32) & 0xFF);
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176 data[pos++] = (byte) ((b >> 24) & 0xFF);
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177 data[pos++] = (byte) ((b >> 16) & 0xFF);
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178 data[pos++] = (byte) ((b >> 8) & 0xFF);
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179 data[pos++] = (byte) (b & 0xFF);
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180 } else {
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181 assert byteOrder == ByteOrder.LittleEndian;
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182 data[pos++] = (byte) (b & 0xFF);
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183 data[pos++] = (byte) ((b >> 8) & 0xFF);
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184 data[pos++] = (byte) ((b >> 16) & 0xFF);
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185 data[pos++] = (byte) ((b >> 24) & 0xFF);
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186 data[pos++] = (byte) ((b >> 32) & 0xFF);
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187 data[pos++] = (byte) ((b >> 40) & 0xFF);
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188 data[pos++] = (byte) ((b >> 48) & 0xFF);
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189 data[pos++] = (byte) ((b >> 56) & 0xFF);
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190 }
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191 return pos;
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192 }
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193
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194 public int position() {
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195 return position;
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196 }
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197
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198 public void setPosition(int position) {
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199 assert position >= 0 && position <= data.length;
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200 this.position = position;
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201 }
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202
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203 public int getByte(int pos) {
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204 return Bytes.beU1(data, pos);
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205 }
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206
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207 public int getShort(int pos) {
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208 if (byteOrder == ByteOrder.BigEndian) {
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209 return
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210 (data[pos + 0] & 0xff) << 8 |
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211 (data[pos + 1] & 0xff) << 0;
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212 } else {
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213 assert byteOrder == ByteOrder.LittleEndian;
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214 return
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215 (data[pos + 1] & 0xff) << 8 |
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216 (data[pos + 0] & 0xff) << 0;
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217 }
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218 }
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219
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220 public int getInt(int pos) {
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221 if (byteOrder == ByteOrder.BigEndian) {
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222 return
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223 (data[pos + 0] & 0xff) << 24 |
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224 (data[pos + 1] & 0xff) << 16 |
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225 (data[pos + 2] & 0xff) << 8 |
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226 (data[pos + 3] & 0xff) << 0;
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227 } else {
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228 assert byteOrder == ByteOrder.LittleEndian;
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229 return
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230 (data[pos + 3] & 0xff) << 24 |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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231 (data[pos + 2] & 0xff) << 16 |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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232 (data[pos + 1] & 0xff) << 8 |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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233 (data[pos + 0] & 0xff) << 0;
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234 }
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235 }
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236
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237 public byte[] copyData(int start, int end) {
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238 return Arrays.copyOfRange(data, start, end);
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239 }
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240
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
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diff changeset
241 /**
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242 * Copies the data from this buffer into a given array.
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243 *
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244 * @param dst the destination array
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245 * @param off starting position in {@code dst}
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246 * @param len number of bytes to copy
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247 */
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248 public void copyInto(byte[] dst, int off, int len) {
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249 System.arraycopy(data, 0, dst, off, len);
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250 }
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Thomas Wuerthinger <thomas@wuerthinger.net>
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251 }