Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/lir/FrameMap.java @ 2789:aeccd2af4e9e
Fixes around critical edge split and placeholder removal after goto removal.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 25 May 2011 16:48:28 +0200 |
parents | a2f62de90c76 |
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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.sun.c1x.lir; |
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24 |
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25 import static com.sun.cri.ci.CiCallingConvention.Type.*; |
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26 import static com.sun.cri.ci.CiKind.*; |
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27 import static java.lang.reflect.Modifier.*; |
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28 |
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29 import com.sun.c1x.*; |
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30 import com.sun.c1x.globalstub.*; |
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31 import com.sun.c1x.util.*; |
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32 import com.sun.cri.bytecode.*; |
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33 import com.sun.cri.ci.*; |
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34 import com.sun.cri.ci.CiCallingConvention.*; |
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35 import com.sun.cri.ri.*; |
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36 import com.sun.cri.util.*; |
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37 |
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38 /** |
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39 * This class is used to build the stack frame layout for a compiled method. |
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40 * |
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41 * This is the format of a stack frame on an x86 (i.e. IA32 or X64) platform: |
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42 * <pre> |
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43 * Base Contents |
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44 * |
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45 * : : |
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46 * | incoming overflow argument n | |
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47 * | ... | |
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48 * | incoming overflow argument 0 | |
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49 * | return address | Caller frame |
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50 * -------+--------------------------------+---------------- --- |
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51 * | | ^ |
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52 * : callee save area : | |
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53 * | | | |
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54 * +--------------------------------+ | |
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55 * | alignment padding | | |
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56 * +--------------------------------+ | |
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57 * | ALLOCA block n | | |
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58 * : ... : | |
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59 * | ALLOCA block 0 | Current frame | |
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60 * +--------------------------------+ | |
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61 * | monitor n | | |
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62 * : ... : | |
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63 * | monitor 0 | | |
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64 * +--------------------------------+ --- | |
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65 * | spill slot n | ^ frame |
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66 * : ... : | size |
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67 * | spill slot 0 | shared | |
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68 * +- - - - - - - - - - - - - - - - + slot | |
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69 * | outgoing overflow argument n | indexes | |
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70 * | ... | | | |
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71 * %sp | outgoing overflow argument 0 | v v |
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72 * -------+--------------------------------+---------------- --- |
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73 * |
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74 * </pre> |
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75 * Note that the size {@link Bytecodes#ALLOCA ALLOCA} blocks and {@code monitor}s in the frame may be greater |
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76 * than the size of a {@linkplain CiTarget#spillSlotSize spill slot}. |
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77 * |
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78 * @author Thomas Wuerthinger |
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79 * @author Ben L. Titzer |
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80 * @author Doug Simon |
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81 */ |
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82 public final class FrameMap { |
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83 |
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84 private final C1XCompilation compilation; |
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85 private final CiCallingConvention incomingArguments; |
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86 |
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87 /** |
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88 * Number of monitors used in this frame. |
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89 */ |
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90 private final int monitorCount; |
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91 |
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92 /** |
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93 * The final frame size. |
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94 * Value is only set after register allocation is complete. |
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95 */ |
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96 private int frameSize; |
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97 |
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98 /** |
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99 * The number of spill slots allocated by the register allocator. |
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100 * The value {@code -2} means that the size of outgoing argument stack slots |
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101 * is not yet fixed. The value {@code -1} means that the register |
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102 * allocator has started allocating spill slots and so the size of |
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103 * outgoing stack slots cannot change as outgoing stack slots and |
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104 * spill slots share the same slot index address space. |
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105 */ |
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106 private int spillSlotCount; |
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107 |
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108 /** |
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109 * The amount of memory allocated within the frame for uses of {@link Bytecodes#ALLOCA}. |
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110 */ |
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111 private int stackBlocksSize; |
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112 |
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113 /** |
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114 * Area occupied by outgoing overflow arguments. |
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115 * This value is adjusted as calling conventions for outgoing calls are retrieved. |
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116 */ |
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117 private int outgoingSize; |
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118 |
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119 /** |
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120 * Creates a new frame map for the specified method. |
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121 * |
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122 * @param compilation the compilation context |
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123 * @param method the outermost method being compiled |
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124 * @param monitors the number of monitors allocated on the stack for this method |
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125 */ |
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126 public FrameMap(C1XCompilation compilation, RiMethod method, int monitors) { |
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127 this.compilation = compilation; |
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128 this.frameSize = -1; |
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129 this.spillSlotCount = -2; |
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130 |
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131 assert monitors >= 0 : "not set"; |
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132 monitorCount = monitors; |
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133 if (method == null) { |
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134 incomingArguments = new CiCallingConvention(new CiValue[0], 0); |
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135 } else { |
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136 CiKind receiver = !isStatic(method.accessFlags()) ? method.holder().kind() : null; |
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137 incomingArguments = getCallingConvention(CRIUtil.signatureToKinds(method.signature(), receiver), JavaCallee); |
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138 } |
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139 } |
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140 |
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141 /** |
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142 * Gets the calling convention for a call with the specified signature. |
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143 * |
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144 * @param type the type of calling convention being requested |
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145 * @param signature the signature of the arguments |
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146 * @return a {@link CiCallingConvention} instance describing the location of parameters and the return value |
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147 */ |
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148 public CiCallingConvention getCallingConvention(CiKind[] signature, Type type) { |
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149 CiCallingConvention cc = compilation.registerConfig.getCallingConvention(type, signature, compilation.target); |
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150 if (type == RuntimeCall) { |
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151 assert cc.stackSize == 0 : "runtime call should not have stack arguments"; |
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152 } else if (type.out) { |
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153 assert frameSize == -1 : "frame size must not yet be fixed!"; |
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154 reserveOutgoing(cc.stackSize); |
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155 } |
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156 return cc; |
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157 } |
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158 |
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159 /** |
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160 * Gets the calling convention for the incoming arguments to the compiled method. |
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161 * @return the calling convention for incoming arguments |
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162 */ |
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163 public CiCallingConvention incomingArguments() { |
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164 return incomingArguments; |
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165 } |
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166 |
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167 /** |
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168 * Gets the frame size of the compiled frame. |
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169 * @return the size in bytes of the frame |
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170 */ |
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171 public int frameSize() { |
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172 assert this.frameSize != -1 : "frame size not computed yet"; |
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173 return frameSize; |
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174 } |
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175 |
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176 /** |
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177 * Sets the frame size for this frame. |
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178 * @param frameSize the frame size in bytes |
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179 */ |
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180 public void setFrameSize(int frameSize) { |
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181 assert this.frameSize == -1 : "should only be calculated once"; |
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182 this.frameSize = frameSize; |
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183 } |
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184 |
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185 /** |
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186 * Computes the frame size for this frame, given the number of spill slots. |
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187 * @param spillSlotCount the number of spill slots |
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188 */ |
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189 public void finalizeFrame(int spillSlotCount) { |
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190 assert this.spillSlotCount == -1 : "can only be set once"; |
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191 assert this.frameSize == -1 : "should only be calculated once"; |
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192 assert spillSlotCount >= 0 : "must be positive"; |
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193 |
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194 this.spillSlotCount = spillSlotCount; |
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195 int frameSize = offsetToStackBlocksEnd(); |
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196 frameSize += compilation.registerConfig.getCalleeSaveArea().size; |
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197 this.frameSize = compilation.target.alignFrameSize(frameSize); |
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198 } |
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199 |
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200 /** |
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201 * Informs the frame map that the compiled code uses a particular global stub, which |
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202 * may need stack space for outgoing arguments. |
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203 * |
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204 * @param stub the global stub |
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205 */ |
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206 public void usesGlobalStub(GlobalStub stub) { |
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207 reserveOutgoing(stub.argsSize); |
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208 } |
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209 |
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210 /** |
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211 * Converts a stack slot into a stack address. |
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212 * |
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213 * @param slot a stack slot |
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214 * @return a stack address |
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215 */ |
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216 public CiAddress toStackAddress(CiStackSlot slot) { |
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217 int size = compilation.target.sizeInBytes(slot.kind); |
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218 if (slot.inCallerFrame()) { |
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219 int offset = slot.index() * compilation.target.spillSlotSize + frameSize() + 8; |
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220 return new CiAddress(slot.kind, CiRegister.Frame.asValue(), offset); |
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221 } else { |
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222 int offset = offsetForOutgoingOrSpillSlot(slot.index(), size); |
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223 return new CiAddress(slot.kind, CiRegister.Frame.asValue(), offset); |
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224 } |
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225 } |
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226 |
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227 /** |
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228 * Gets the stack address within this frame for a given reserved stack block. |
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229 * |
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230 * @param stackBlock the value returned from {@link #reserveStackBlock(int)} identifying the stack block |
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231 * @return a representation of the stack location |
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232 */ |
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233 public CiAddress toStackAddress(StackBlock stackBlock) { |
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234 return new CiAddress(CiKind.Word, compilation.registerConfig.getFrameRegister().asValue(Word), offsetForStackBlock(stackBlock)); |
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235 } |
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236 |
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237 /** |
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238 * Converts the monitor index into the stack address of the object reference in the on-stack monitor. |
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239 * |
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240 * @param monitorIndex the monitor index |
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241 * @return a representation of the stack address |
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242 */ |
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243 public CiStackSlot toMonitorObjectStackAddress(int monitorIndex) { |
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244 int byteIndex = offsetForMonitorObject(monitorIndex); |
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245 assert byteIndex % compilation.target.wordSize == 0; |
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246 return CiStackSlot.get(CiKind.Object, byteIndex / compilation.target.wordSize); |
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247 } |
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248 |
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249 /** |
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250 * Converts the monitor index into the stack address of the on-stak monitor. |
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251 * |
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252 * @param monitorIndex the monitor index |
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253 * @return a representation of the stack address |
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254 */ |
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255 public CiStackSlot toMonitorBaseStackAddress(int monitorIndex) { |
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256 int byteIndex = offsetForMonitorBase(monitorIndex); |
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257 assert byteIndex % compilation.target.wordSize == 0; |
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258 return CiStackSlot.get(CiKind.Object, byteIndex / compilation.target.wordSize); |
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259 } |
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260 |
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261 /** |
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262 * Reserves space for stack-based outgoing arguments. |
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263 * |
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264 * @param argsSize the amount of space to reserve for stack-based outgoing arguments |
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265 */ |
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266 public void reserveOutgoing(int argsSize) { |
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267 assert spillSlotCount == -2 : "cannot reserve outgoing stack slot space once register allocation has started"; |
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268 if (argsSize > outgoingSize) { |
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269 outgoingSize = Util.roundUp(argsSize, compilation.target.spillSlotSize); |
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270 } |
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271 } |
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272 |
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273 /** |
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274 * Encapsulates the details of a stack block reserved by a call to {@link FrameMap#reserveStackBlock(int)}. |
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275 */ |
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276 public static final class StackBlock { |
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277 /** |
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278 * The size of this stack block. |
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279 */ |
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280 public final int size; |
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281 |
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282 /** |
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283 * The offset of this stack block within the frame space reserved for stack blocks. |
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284 */ |
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285 public final int offset; |
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286 |
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287 public StackBlock(int size, int offset) { |
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288 this.size = size; |
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289 this.offset = offset; |
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290 } |
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291 } |
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292 |
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293 /** |
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294 * Reserves a block of memory in the frame of the method being compiled. |
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295 * |
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296 * @param size the number of bytes to reserve |
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297 * @return a descriptor of the reserved block that can be used with {@link #toStackAddress(StackBlock)} once register |
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298 * allocation is complete and the size of the frame has been {@linkplain #finalizeFrame(int) finalized}. |
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299 */ |
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300 public StackBlock reserveStackBlock(int size) { |
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301 int wordSize = compilation.target.sizeInBytes(CiKind.Word); |
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302 assert (size % wordSize) == 0; |
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303 StackBlock block = new StackBlock(size, stackBlocksSize); |
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304 stackBlocksSize += size; |
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305 return block; |
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306 } |
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307 |
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308 private int offsetForStackBlock(StackBlock stackBlock) { |
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309 assert stackBlock.offset >= 0 && stackBlock.offset + stackBlock.size <= stackBlocksSize : "invalid stack block"; |
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310 int offset = offsetToStackBlocks() + stackBlock.offset; |
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311 assert offset <= (frameSize() - stackBlock.size) : "spill outside of frame"; |
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312 return offset; |
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313 } |
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314 |
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315 /** |
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316 * Gets the stack pointer offset for a outgoing stack argument or compiler spill slot. |
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317 * |
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318 * @param slotIndex the index of the stack slot within the slot index space reserved for |
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319 * @param size |
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320 * @return |
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321 */ |
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322 private int offsetForOutgoingOrSpillSlot(int slotIndex, int size) { |
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323 assert slotIndex >= 0 && slotIndex < (initialSpillSlot() + spillSlotCount) : "invalid spill slot"; |
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324 int offset = slotIndex * compilation.target.spillSlotSize; |
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325 assert offset <= (frameSize() - size) : "slot outside of frame"; |
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326 return offset; |
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327 } |
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328 |
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329 private int offsetForMonitorBase(int index) { |
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330 assert index >= 0 && index < monitorCount : "invalid monitor index : " + index + " (monitorCount=" + monitorCount + ")"; |
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331 int size = compilation.runtime.sizeOfBasicObjectLock(); |
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332 assert size != 0 : "monitors are not on the stack in this VM"; |
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333 int offset = offsetToMonitors() + index * size; |
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334 assert offset <= (frameSize() - size) : "monitor outside of frame"; |
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335 return offset; |
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336 } |
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337 |
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338 private int offsetToSpillArea() { |
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339 return outgoingSize; |
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340 } |
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341 |
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342 private int offsetToSpillEnd() { |
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343 return offsetToSpillArea() + spillSlotCount * compilation.target.spillSlotSize; |
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344 } |
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345 |
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346 private int offsetToMonitors() { |
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347 return offsetToCustomArea() + customAreaSize(); |
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348 } |
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349 |
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350 public int customAreaSize() { |
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351 return compilation.runtime.getCustomStackAreaSize(); |
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352 } |
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353 |
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354 public int offsetToCustomArea() { |
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355 return offsetToSpillEnd(); |
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356 } |
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357 |
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358 private int offsetToMonitorsEnd() { |
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359 return offsetToMonitors() + (monitorCount * compilation.runtime.sizeOfBasicObjectLock()); |
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360 } |
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361 |
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362 private int offsetToStackBlocks() { |
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363 return offsetToMonitorsEnd(); |
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364 } |
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365 |
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366 private int offsetToStackBlocksEnd() { |
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367 return offsetToStackBlocks() + stackBlocksSize; |
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368 } |
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369 |
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370 public int offsetToCalleeSaveAreaStart() { |
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371 return offsetToCalleeSaveAreaEnd() - compilation.registerConfig.getCalleeSaveArea().size; |
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372 } |
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373 |
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374 public int offsetToCalleeSaveAreaEnd() { |
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375 return frameSize; |
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376 } |
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377 |
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378 private int offsetForMonitorObject(int index) { |
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379 return offsetForMonitorBase(index) + compilation.runtime.basicObjectLockOffsetInBytes(); |
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380 } |
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381 |
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382 /** |
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383 * Gets the index of the first available spill slot relative to the base of the frame. |
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384 * After this call, no further outgoing stack slots can be {@linkplain #reserveOutgoing(int) reserved}. |
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385 * |
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386 * @return the index of the first available spill slot |
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387 */ |
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388 public int initialSpillSlot() { |
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389 if (spillSlotCount == -2) { |
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390 spillSlotCount = -1; |
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391 } |
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392 return outgoingSize / compilation.target.spillSlotSize; |
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393 } |
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394 |
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395 } |