Mercurial > hg > truffle
annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiArchitecture.java @ 4266:e2499e6d8aa7
Merge
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 11 Jan 2012 16:31:46 +0100 |
parents | aaac4894175c |
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rev | line source |
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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.cri.ci; |
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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.oracle.max.cri.ci.CiRegister.*; |
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28 import com.oracle.max.cri.util.*; |
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29 |
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30 |
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31 /** |
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32 * Represents a CPU architecture, including information such as its endianness, CPU |
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33 * registers, word width, etc. |
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34 */ |
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35 public abstract class CiArchitecture { |
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36 |
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37 /** |
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38 * The endianness of the architecture. |
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39 */ |
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40 public static enum ByteOrder { |
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41 LittleEndian, |
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42 BigEndian |
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43 } |
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44 |
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45 /** |
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46 * The number of bits required in a bit map covering all the registers that may store references. |
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47 * The bit position of a register in the map is the register's {@linkplain CiRegister#number number}. |
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48 */ |
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49 public final int registerReferenceMapBitCount; |
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50 |
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51 /** |
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52 * Represents the natural size of words (typically registers and pointers) of this architecture, in bytes. |
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53 */ |
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54 public final int wordSize; |
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55 |
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56 /** |
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57 * The name of this architecture (e.g. "AMD64", "SPARCv9"). |
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58 */ |
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59 public final String name; |
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60 |
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61 /** |
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62 * Array of all available registers on this architecture. The index of each register in this |
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63 * array is equal to its {@linkplain CiRegister#number number}. |
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64 */ |
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65 public final CiRegister[] registers; |
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66 |
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67 /** |
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68 * Map of all registers keyed by their {@linkplain CiRegister#name names}. |
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69 */ |
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70 public final HashMap<String, CiRegister> registersByName; |
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71 |
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72 /** |
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73 * The byte ordering can be either little or big endian. |
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74 */ |
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75 public final ByteOrder byteOrder; |
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76 |
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77 /** |
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78 * Mask of the barrier constants defined in {@link MemoryBarriers} denoting the barriers that |
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79 * are not required to be explicitly inserted under this architecture. |
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80 */ |
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81 public final int implicitMemoryBarriers; |
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82 |
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83 /** |
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84 * Determines the barriers in a given barrier mask that are explicitly required on this architecture. |
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85 * |
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86 * @param barriers a mask of the barrier constants defined in {@link MemoryBarriers} |
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87 * @return the value of {@code barriers} minus the barriers unnecessary on this architecture |
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88 */ |
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89 public final int requiredBarriers(int barriers) { |
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90 return barriers & ~implicitMemoryBarriers; |
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91 } |
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92 |
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93 /** |
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94 * Offset in bytes from the beginning of a call instruction to the displacement. |
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95 */ |
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96 public final int machineCodeCallDisplacementOffset; |
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97 |
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98 /** |
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99 * The size of the return address pushed to the stack by a call instruction. |
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100 * A value of 0 denotes that call linkage uses registers instead (e.g. SPARC). |
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101 */ |
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102 public final int returnAddressSize; |
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103 |
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104 private final EnumMap<RegisterFlag, CiRegister[]> registersByTypeAndEncoding; |
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105 |
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106 /** |
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107 * Gets the register for a given {@linkplain CiRegister#encoding encoding} and type. |
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108 * |
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109 * @param encoding a register value as used in a machine instruction |
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110 * @param type the type of the register |
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111 */ |
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112 public CiRegister registerFor(int encoding, RegisterFlag type) { |
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113 CiRegister[] regs = registersByTypeAndEncoding.get(type); |
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114 assert encoding >= 0 && encoding < regs.length; |
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115 CiRegister reg = regs[encoding]; |
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116 assert reg != null; |
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117 return reg; |
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118 } |
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119 |
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120 protected CiArchitecture(String name, |
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121 int wordSize, |
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122 ByteOrder byteOrder, |
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123 CiRegister[] registers, |
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124 int implicitMemoryBarriers, |
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125 int nativeCallDisplacementOffset, |
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126 int registerReferenceMapBitCount, |
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127 int returnAddressSize) { |
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128 this.name = name; |
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129 this.registers = registers; |
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130 this.wordSize = wordSize; |
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131 this.byteOrder = byteOrder; |
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132 this.implicitMemoryBarriers = implicitMemoryBarriers; |
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133 this.machineCodeCallDisplacementOffset = nativeCallDisplacementOffset; |
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134 this.registerReferenceMapBitCount = registerReferenceMapBitCount; |
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135 this.returnAddressSize = returnAddressSize; |
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136 |
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137 registersByName = new HashMap<>(registers.length); |
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138 for (CiRegister register : registers) { |
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139 registersByName.put(register.name, register); |
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140 assert registers[register.number] == register; |
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141 } |
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142 |
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143 registersByTypeAndEncoding = new EnumMap<>(RegisterFlag.class); |
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144 EnumMap<RegisterFlag, CiRegister[]> categorizedRegs = CiRegister.categorize(registers); |
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145 for (RegisterFlag type : RegisterFlag.values()) { |
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146 CiRegister[] regs = categorizedRegs.get(type); |
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147 int max = CiRegister.maxRegisterEncoding(regs); |
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148 CiRegister[] regsByEnc = new CiRegister[max + 1]; |
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149 for (CiRegister reg : regs) { |
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150 regsByEnc[reg.encoding] = reg; |
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151 } |
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152 registersByTypeAndEncoding.put(type, regsByEnc); |
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153 } |
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154 } |
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155 |
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156 /** |
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157 * Converts this architecture to a string. |
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158 * @return the string representation of this architecture |
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159 */ |
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160 @Override |
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161 public final String toString() { |
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162 return name.toLowerCase(); |
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163 } |
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164 |
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165 /** |
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166 * Checks whether this is a 32-bit architecture. |
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167 * @return {@code true} if this architecture is 32-bit |
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168 */ |
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169 public final boolean is32bit() { |
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170 return wordSize == 4; |
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171 } |
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172 |
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173 /** |
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174 * Checks whether this is a 64-bit architecture. |
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175 * @return {@code true} if this architecture is 64-bit |
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176 */ |
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177 public final boolean is64bit() { |
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178 return wordSize == 8; |
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179 } |
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180 |
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181 // The following methods are architecture specific and not dependent on state |
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182 // stored in this class. They have convenient default implementations. |
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183 |
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184 /** |
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185 * Checks whether this architecture's normal arithmetic instructions use a two-operand form |
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186 * (e.g. x86 which overwrites one operand register with the result when adding). |
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187 * @return {@code true} if this architecture uses two-operand mode |
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188 */ |
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189 public boolean twoOperandMode() { |
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190 return false; |
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191 } |
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192 |
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193 // TODO: Why enumerate the concrete subclasses here rather |
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194 // than use instanceof comparisons in code that cares? |
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195 |
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196 /** |
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197 * Checks whether the architecture is x86. |
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198 * @return {@code true} if the architecture is x86 |
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199 */ |
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200 public boolean isX86() { |
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201 return false; |
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202 } |
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203 |
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204 /** |
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205 * Checks whether the architecture is SPARC. |
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206 * @return {@code true} if the architecture is SPARC |
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207 */ |
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208 public boolean isSPARC() { |
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209 return false; |
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210 } |
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211 |
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212 } |