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annotate graal/com.oracle.graal.asm/src/com/oracle/graal/asm/Buffer.java @ 7804:447f9ba1962b

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Experimental PTX backend. Contribution by Christian Thalinger.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Mon, 18 Feb 2013 14:47:54 -0800
parents 5e3d1a68664e
children 0fb4d10bd256
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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.graal.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
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29 * is implemented using subclasses.
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30 */
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31 public abstract class Buffer {
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32
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33 protected byte[] data;
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34 protected int position;
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35
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36 public Buffer() {
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37 data = new byte[AsmOptions.InitialCodeBufferSize];
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38 }
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39
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40 public void reset() {
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41 position = 0;
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42 }
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43
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44 public int position() {
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45 return position;
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46 }
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47
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48 public void setPosition(int position) {
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49 assert position >= 0 && position <= data.length;
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50 this.position = position;
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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
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57 * including) {@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 byte[] copyData(int start, int end) {
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67 return Arrays.copyOfRange(data, start, end);
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68 }
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69
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70 /**
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71 * Copies the data from this buffer into a given array.
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72 *
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73 * @param dst the destination array
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74 * @param off starting position in {@code dst}
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75 * @param len number of bytes to copy
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76 */
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77 public void copyInto(byte[] dst, int off, int len) {
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78 System.arraycopy(data, 0, dst, off, len);
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79 }
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80
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81 protected void ensureSize(int length) {
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82 if (length >= data.length) {
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83 data = Arrays.copyOf(data, length * 4);
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84 }
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85 }
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86
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87 public void emitBytes(byte[] arr, int off, int len) {
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88 ensureSize(position + len);
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89 System.arraycopy(arr, off, data, position, len);
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90 position += len;
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91 }
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92
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93 public void emitByte(int b) {
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94 position = emitByte(b, position);
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95 }
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96
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97 public void emitShort(int b) {
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98 position = emitShort(b, position);
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99 }
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100
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101 public void emitInt(int b) {
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102 position = emitInt(b, position);
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103 }
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104
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105 public void emitLong(long b) {
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106 position = emitLong(b, position);
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107 }
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108
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109 private static final String NEWLINE = System.getProperty("line.separator");
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110
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111 public void emitString(String s) {
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112 position = emitString("\t", position); // XXX REMOVE ME pretty-printing
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113 position = emitString(s, position);
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114 position = emitString(NEWLINE, position);
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115 }
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116
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117 // XXX for pretty-printing
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118 public void emitString0(String s) {
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119 emitBytes(s.getBytes(), 0, s.length());
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120 }
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121
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122 public int emitBytes(byte[] arr, int pos) {
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123 final int len = arr.length;
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124 final int newPos = pos + len;
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125 ensureSize(newPos);
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126 System.arraycopy(arr, 0, data, pos, len);
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127 return newPos;
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128 }
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129
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130 public int emitByte(int b, int pos) {
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131 assert NumUtil.isUByte(b);
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132 int newPos = pos + 1;
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133 ensureSize(newPos);
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134 data[pos] = (byte) (b & 0xFF);
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135 return newPos;
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136 }
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137
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138 public abstract int emitShort(int b, int pos);
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139
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140 public abstract int emitInt(int b, int pos);
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141
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142 public abstract int emitLong(long b, int pos);
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143
7804
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144 public int emitString(String s, int pos) {
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145 return emitBytes(s.getBytes(), pos);
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146 }
447f9ba1962b Experimental PTX backend. Contribution by Christian Thalinger.
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147
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148 public int getByte(int pos) {
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149 return data[pos] & 0xff;
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150 }
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151
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152 public abstract int getShort(int pos);
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153
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154 public abstract int getInt(int pos);
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155
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156 public static final class BigEndian extends Buffer {
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157
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158 @Override
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159 public int emitShort(int b, int pos) {
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160 assert NumUtil.isUShort(b);
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161 int newPos = pos + 2;
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162 ensureSize(pos + 2);
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163 data[pos] = (byte) ((b >> 8) & 0xFF);
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164 data[pos + 1] = (byte) (b & 0xFF);
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165 return newPos;
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166 }
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167
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168 @Override
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169 public int emitInt(int b, int pos) {
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170 int newPos = pos + 4;
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171 ensureSize(newPos);
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172 data[pos] = (byte) ((b >> 24) & 0xFF);
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173 data[pos + 1] = (byte) ((b >> 16) & 0xFF);
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174 data[pos + 2] = (byte) ((b >> 8) & 0xFF);
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175 data[pos + 3] = (byte) (b & 0xFF);
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176 return newPos;
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177 }
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178
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179 @Override
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180 public int emitLong(long b, int pos) {
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181 int newPos = pos + 8;
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182 ensureSize(newPos);
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183 data[pos] = (byte) ((b >> 56) & 0xFF);
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184 data[pos + 1] = (byte) ((b >> 48) & 0xFF);
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185 data[pos + 2] = (byte) ((b >> 40) & 0xFF);
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186 data[pos + 3] = (byte) ((b >> 32) & 0xFF);
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187 data[pos + 4] = (byte) ((b >> 24) & 0xFF);
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188 data[pos + 5] = (byte) ((b >> 16) & 0xFF);
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189 data[pos + 6] = (byte) ((b >> 8) & 0xFF);
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190 data[pos + 7] = (byte) (b & 0xFF);
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191 return newPos;
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192 }
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193
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194 @Override
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195 public int getShort(int pos) {
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196 return (data[pos + 0] & 0xff) << 8 | (data[pos + 1] & 0xff) << 0;
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197 }
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198
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199 @Override
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200 public int getInt(int pos) {
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201 return (data[pos + 0] & 0xff) << 24 | (data[pos + 1] & 0xff) << 16 | (data[pos + 2] & 0xff) << 8 | (data[pos + 3] & 0xff) << 0;
3733
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202 }
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parents:
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203 }
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204
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205 public static final class LittleEndian extends Buffer {
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206
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207 @Override
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208 public int emitShort(int b, int pos) {
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diff changeset
209 assert NumUtil.isUShort(b);
4142
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diff changeset
210 int newPos = pos + 2;
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diff changeset
211 ensureSize(newPos);
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212 data[pos] = (byte) (b & 0xFF);
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213 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
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diff changeset
214 return newPos;
3733
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diff changeset
215 }
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parents:
diff changeset
216
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parents:
diff changeset
217 @Override
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diff changeset
218 public int emitInt(int b, int pos) {
4142
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diff changeset
219 int newPos = pos + 4;
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
220 ensureSize(newPos);
bc8527f3071c Adjust code base to new level of warnings.
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diff changeset
221 data[pos] = (byte) (b & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
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diff changeset
222 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
223 data[pos + 2] = (byte) ((b >> 16) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
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diff changeset
224 data[pos + 3] = (byte) ((b >> 24) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
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diff changeset
225 return newPos;
3733
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diff changeset
226 }
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parents:
diff changeset
227
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parents:
diff changeset
228 @Override
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diff changeset
229 public int emitLong(long b, int pos) {
4142
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diff changeset
230 int newPos = pos + 8;
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
231 ensureSize(newPos);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
232 data[pos] = (byte) (b & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
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diff changeset
233 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
234 data[pos + 2] = (byte) ((b >> 16) & 0xFF);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
235 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
236 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
237 data[pos + 5] = (byte) ((b >> 40) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
238 data[pos + 6] = (byte) ((b >> 48) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
239 data[pos + 7] = (byte) ((b >> 56) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
240 return newPos;
3733
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parents:
diff changeset
241 }
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parents:
diff changeset
242
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
243 @Override
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parents:
diff changeset
244 public int getShort(int pos) {
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diff changeset
245 return (data[pos + 1] & 0xff) << 8 | (data[pos + 0] & 0xff) << 0;
3733
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parents:
diff changeset
246 }
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parents:
diff changeset
247
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
248 @Override
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parents:
diff changeset
249 public int getInt(int pos) {
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diff changeset
250 return (data[pos + 3] & 0xff) << 24 | (data[pos + 2] & 0xff) << 16 | (data[pos + 1] & 0xff) << 8 | (data[pos + 0] & 0xff) << 0;
3733
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parents:
diff changeset
251 }
e233f5660da4 Added Java files from Maxine project.
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parents:
diff changeset
252 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
253 }