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annotate graal/com.oracle.graal.asm/src/com/oracle/graal/asm/Assembler.java @ 14754:164903a50a9a

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make ensureUniquePC an abstract method of the base Assembler class
author Erik Eckstein <erik.eckstein@oracle.com>
date Wed, 26 Mar 2014 10:04:37 +0100
parents d1c1f103d42c
children 5a7b82c1514e
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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.nio.*;
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26 import java.util.*;
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27
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28 import com.oracle.graal.api.code.*;
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30 /**
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31 * The platform-independent base class for the assembler.
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32 */
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33 public abstract class Assembler {
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34
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35 public final TargetDescription target;
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36
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37 /**
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38 * Backing code buffer.
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39 */
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40 private final Buffer codeBuffer;
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41
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42 public Assembler(TargetDescription target) {
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43 this.target = target;
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44 if (target.arch.getByteOrder() == ByteOrder.BIG_ENDIAN) {
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45 this.codeBuffer = new Buffer.BigEndian();
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46 } else {
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47 this.codeBuffer = new Buffer.LittleEndian();
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48 }
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49 }
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51 /**
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52 * Returns the current position of the underlying code buffer.
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53 *
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54 * @return current position in code buffer
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55 */
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56 public int position() {
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57 return codeBuffer.position();
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58 }
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59
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60 public final void emitByte(int x) {
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61 codeBuffer.emitByte(x);
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62 }
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63
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64 public final void emitShort(int x) {
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65 codeBuffer.emitShort(x);
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66 }
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67
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68 public final void emitInt(int x) {
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69 codeBuffer.emitInt(x);
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70 }
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71
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72 public final void emitLong(long x) {
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73 codeBuffer.emitLong(x);
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74 }
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75
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76 public final void emitByte(int b, int pos) {
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77 codeBuffer.emitByte(b, pos);
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78 }
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79
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80 public final void emitShort(int b, int pos) {
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81 codeBuffer.emitShort(b, pos);
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82 }
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83
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84 public final void emitInt(int b, int pos) {
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85 codeBuffer.emitInt(b, pos);
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86 }
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87
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88 public final void emitLong(long b, int pos) {
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89 codeBuffer.emitLong(b, pos);
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90 }
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91
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92 public final int getByte(int pos) {
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93 return codeBuffer.getByte(pos);
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94 }
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95
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96 public final int getShort(int pos) {
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97 return codeBuffer.getShort(pos);
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98 }
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99
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100 public final int getInt(int pos) {
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101 return codeBuffer.getInt(pos);
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102 }
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103
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104 private static final String NEWLINE = System.getProperty("line.separator");
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105
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106 /**
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107 * Some GPU architectures have a text based encoding.
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108 */
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109 public final void emitString(String x) {
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110 emitString0("\t"); // XXX REMOVE ME pretty-printing
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111 emitString0(x);
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112 emitString0(NEWLINE);
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113 }
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114
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115 // XXX for pretty-printing
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116 public final void emitString0(String x) {
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117 codeBuffer.emitBytes(x.getBytes(), 0, x.length());
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118 }
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119
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120 public void emitString(String s, int pos) {
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121 codeBuffer.emitBytes(s.getBytes(), pos);
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122 }
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123
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124 /**
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125 * Closes this assembler. No extra data can be written to this assembler after this call.
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126 *
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127 * @param trimmedCopy if {@code true}, then a copy of the underlying byte array up to (but not
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128 * including) {@code position()} is returned
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129 * @return the data in this buffer or a trimmed copy if {@code trimmedCopy} is {@code true}
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130 */
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131 public byte[] close(boolean trimmedCopy) {
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132 return codeBuffer.close(trimmedCopy);
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133 }
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134
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135 public void bind(Label l) {
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136 assert !l.isBound() : "can bind label only once";
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137 l.bind(position());
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138 l.patchInstructions(this);
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139 }
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140
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141 public abstract void align(int modulus);
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142
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143 public abstract void jmp(Label l);
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144
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145 protected abstract void patchJumpTarget(int branch, int jumpTarget);
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146
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147 private Map<Label, String> nameMap;
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148
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149 /**
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150 * Creates a name for a label.
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151 *
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152 * @param l the label for which a name is being created
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153 * @param id a label identifier that is unique with the scope of this assembler
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154 * @return a label name in the form of "L123"
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155 */
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156 protected String createLabelName(Label l, int id) {
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157 return "L" + id;
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158 }
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159
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160 /**
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161 * Gets a name for a label, creating it if it does not yet exist. By default, the returned name
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162 * is only unique with the scope of this assembler.
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163 */
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164 public String nameOf(Label l) {
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165 if (nameMap == null) {
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166 nameMap = new HashMap<>();
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167 }
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168 String name = nameMap.get(l);
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169 if (name == null) {
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170 name = createLabelName(l, nameMap.size());
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171 nameMap.put(l, name);
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172 }
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173 return name;
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174 }
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175
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176 /**
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177 * This is used by the CompilationResultBuilder to convert a {@link StackSlot} to an
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178 * {@link AbstractAddress}.
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179 */
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180 public abstract AbstractAddress makeAddress(Register base, int displacement);
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181
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182 /**
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183 * Returns a target specific placeholder address that can be used for code patching.
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184 */
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185 public abstract AbstractAddress getPlaceholder();
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186
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187 /**
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188 * Emits a NOP instruction to advance the current PC.
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189 */
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190 public abstract void ensureUniquePC();
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191 }