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annotate graal/GraalCompiler/src/com/sun/c1x/lir/FrameMap.java @ 2677:0ea5f12e873a

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use com.oracle.max.asm project for assembler
author Christian.Wimmer@Oracle.com
date Fri, 13 May 2011 17:09:20 -0700
parents fec99fc30af1
children a2f62de90c76
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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.Type;
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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) {
2592
fec99fc30af1 checkstyle fixes, updated AccessArray + subclasses
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330 assert index >= 0 && index < monitorCount : "invalid monitor index : " + index + " (monitorCount=" + monitorCount + ")";
2507
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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 }