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annotate graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/Architecture.java @ 6582:cc32ce37eddc

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deleted Architecture.twoOperandMode() and encapsulated all public fields in Architecture with getters
author Doug Simon <doug.simon@oracle.com>
date Thu, 25 Oct 2012 20:08:32 +0200
parents 2a456986716b
children 5e3d1a68664e
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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.api.code;
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25 import java.util.*;
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27 import com.oracle.graal.api.code.Register.*;
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30 /**
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31 * Represents a CPU architecture, including information such as its endianness, CPU
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32 * registers, word width, etc.
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33 */
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34 public abstract class Architecture {
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35
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36 /**
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37 * The endianness of the architecture.
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38 */
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39 public static enum ByteOrder {
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40 LittleEndian,
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41 BigEndian
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42 }
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43
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44 /**
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45 * The number of bits required in a bit map covering all the registers that may store references.
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46 * The bit position of a register in the map is the register's {@linkplain Register#number number}.
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47 */
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48 private final int registerReferenceMapBitCount;
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49
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50 /**
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51 * Represents the natural size of words (typically registers and pointers) of this architecture, in bytes.
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52 */
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53 private final int wordSize;
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55 /**
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56 * The name of this architecture (e.g. "AMD64", "SPARCv9").
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57 */
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58 private final String name;
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59
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60 /**
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61 * Array of all available registers on this architecture. The index of each register in this
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62 * array is equal to its {@linkplain Register#number number}.
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63 */
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64 private final Register[] registers;
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65
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66 /**
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67 * The byte ordering can be either little or big endian.
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68 */
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69 private final ByteOrder byteOrder;
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70
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71 /**
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72 * Mask of the barrier constants denoting the barriers that
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73 * are not required to be explicitly inserted under this architecture.
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74 */
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75 private final int implicitMemoryBarriers;
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76
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77 /**
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78 * Offset in bytes from the beginning of a call instruction to the displacement.
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79 */
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80 private final int machineCodeCallDisplacementOffset;
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81
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82 /**
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83 * The size of the return address pushed to the stack by a call instruction.
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84 * A value of 0 denotes that call linkage uses registers instead (e.g. SPARC).
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85 */
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86 private final int returnAddressSize;
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87
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88 private final EnumMap<RegisterFlag, Register[]> registersByTypeAndEncoding;
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89
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90 /**
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91 * Gets the register for a given {@linkplain Register#encoding encoding} and type.
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92 *
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93 * @param encoding a register value as used in a machine instruction
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94 * @param type the type of the register
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95 */
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96 public Register registerFor(int encoding, RegisterFlag type) {
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97 Register[] regs = registersByTypeAndEncoding.get(type);
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98 assert encoding >= 0 && encoding < regs.length;
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99 Register reg = regs[encoding];
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100 assert reg != null;
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101 return reg;
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102 }
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103
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104 protected Architecture(String name,
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105 int wordSize,
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106 ByteOrder byteOrder,
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107 Register[] registers,
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108 int implicitMemoryBarriers,
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109 int nativeCallDisplacementOffset,
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110 int registerReferenceMapBitCount,
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111 int returnAddressSize) {
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112 this.name = name;
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113 this.registers = registers;
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114 this.wordSize = wordSize;
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115 this.byteOrder = byteOrder;
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116 this.implicitMemoryBarriers = implicitMemoryBarriers;
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117 this.machineCodeCallDisplacementOffset = nativeCallDisplacementOffset;
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118 this.registerReferenceMapBitCount = registerReferenceMapBitCount;
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119 this.returnAddressSize = returnAddressSize;
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120
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121 registersByTypeAndEncoding = new EnumMap<>(RegisterFlag.class);
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122 EnumMap<RegisterFlag, Register[]> categorizedRegs = Register.categorize(registers);
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123 for (RegisterFlag type : RegisterFlag.values()) {
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124 Register[] regs = categorizedRegs.get(type);
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125 int max = Register.maxRegisterEncoding(regs);
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126 Register[] regsByEnc = new Register[max + 1];
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127 for (Register reg : regs) {
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128 regsByEnc[reg.encoding] = reg;
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129 }
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130 registersByTypeAndEncoding.put(type, regsByEnc);
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131 }
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132 }
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133
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134 /**
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135 * Converts this architecture to a string.
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136 * @return the string representation of this architecture
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137 */
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138 @Override
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139 public final String toString() {
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140 return getName().toLowerCase();
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141 }
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142
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143 public int getRegisterReferenceMapBitCount() {
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144 return registerReferenceMapBitCount;
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145 }
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146
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147 /**
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148 * Gets the natural size of words (typically registers and pointers) of this architecture, in bytes.
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149 */
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150 public int getWordSize() {
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151 return wordSize;
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152 }
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153
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154 /**
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155 * Gets the name of this architecture.
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156 */
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157 public String getName() {
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158 return name;
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159 }
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160
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161 /**
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162 * Gets an array of all available registers on this architecture. The index of each register in this
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163 * array is equal to its {@linkplain Register#number number}.
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164 */
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165 public Register[] getRegisters() {
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166 return registers.clone();
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167 }
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168
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169 public ByteOrder getByteOrder() {
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170 return byteOrder;
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171 }
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172
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173 /**
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174 * Gets a mask of the barrier constants denoting the barriers that
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175 * are not required to be explicitly inserted under this architecture.
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176 */
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177 public int getImplicitMemoryBarriers() {
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178 return implicitMemoryBarriers;
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179 }
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180
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181 /**
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182 * Gets the size of the return address pushed to the stack by a call instruction.
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183 * A value of 0 denotes that call linkage uses registers instead.
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184 */
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185 public int getReturnAddressSize() {
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186 return returnAddressSize;
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187 }
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188
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189 /**
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190 * Gets the offset in bytes from the beginning of a call instruction to the displacement.
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191 */
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192 public int getMachineCodeCallDisplacementOffset() {
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193 return machineCodeCallDisplacementOffset;
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194 }
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195
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196 /**
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197 * Determines the barriers in a given barrier mask that are explicitly required on this architecture.
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198 *
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199 * @param barriers a mask of the barrier constants
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200 * @return the value of {@code barriers} minus the barriers unnecessary on this architecture
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201 */
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202 public final int requiredBarriers(int barriers) {
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203 return barriers & ~implicitMemoryBarriers;
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204 }
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205 }