Mercurial > hg > graal-jvmci-8
annotate graal/Compiler/src/com/sun/c1x/graph/ScopeData.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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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.graph; |
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24 |
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25 import static com.sun.c1x.graph.ScopeData.Flag.*; |
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26 import static com.sun.c1x.graph.ScopeData.ReturnBlock.*; |
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27 |
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28 import java.util.*; |
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29 |
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30 import com.sun.c1x.*; |
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31 import com.sun.c1x.ir.*; |
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32 import com.sun.c1x.value.*; |
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33 import com.sun.cri.bytecode.*; |
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34 import com.sun.cri.ri.*; |
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35 |
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36 /** |
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37 * The {@code ScopeData} class represents inlining context when parsing the bytecodes |
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38 * of an inlined method. |
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39 * |
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40 * @author Ben L. Titzer |
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41 */ |
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42 public class ScopeData { |
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43 // XXX: refactor and split this class into ScopeData, JsrScopeData, and InlineScopeData |
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44 |
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45 /** |
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46 * An enumeration of flags describing scope attributes. |
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47 */ |
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48 public enum Flag { |
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49 /** |
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50 * Scope is protected by an exception handler. |
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51 * This attribute is inherited by nested scopes. |
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52 */ |
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53 HasHandler, |
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54 |
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55 /** |
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56 * Code in scope cannot contain safepoints. |
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57 * This attribute is inherited by nested scopes. |
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58 */ |
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59 NoSafepoints; |
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60 |
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61 public final int mask = 1 << ordinal(); |
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62 } |
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63 |
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64 |
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65 final ScopeData parent; |
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66 // the IR scope |
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67 final IRScope scope; |
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68 // bci-to-block mapping |
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69 final BlockMap blockMap; |
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70 // the bytecode stream |
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71 final BytecodeStream stream; |
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72 // the constant pool |
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73 final RiConstantPool constantPool; |
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74 // the worklist of blocks, managed like a sorted list |
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75 BlockBegin[] workList; |
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76 // the current position in the worklist |
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77 int workListIndex; |
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78 // maximum inline size for this scope |
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79 int maxInlineSize; |
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80 |
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81 /** |
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82 * Mask of {@link Flag} values. |
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83 */ |
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84 int flags; |
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85 |
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86 // Exception handler list |
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87 List<ExceptionHandler> exceptionHandlers; |
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88 |
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89 // The continuation point for the inline. Currently only used in |
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90 // multi-block inlines, but eventually would like to use this for |
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91 // all inlines for uniformity and simplicity; in this case would |
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92 // get the continuation point from the BlockList instead of |
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93 // fabricating it anew because Invokes would be considered to be |
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94 // BlockEnds. |
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95 BlockBegin continuation; |
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96 |
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97 // Without return value of inlined method on stack |
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98 FrameState continuationState; |
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99 |
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100 /** |
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101 * Field used to generate fewer blocks when inlining. If this value is {@code null}, |
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102 * then no {@code return}s have been encountered during inlining. If it is an instance |
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103 * of {@link ReturnBlock}, then it is the block info for the single {@code return} |
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104 * encountered. Otherwise, it will be {@link ReturnBlock#MULTIPLE_RETURNS}. |
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105 */ |
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106 ReturnBlock inlinedReturnBlock; |
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107 |
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108 /** |
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109 * Tracks the destination bci of the jsr. This is (currently) only used to determine |
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110 * bailout conditions, since only a subset of all of the possible jsr-ret control |
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111 * structures can (currently) be compiled. |
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112 * |
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113 * A value > 0 for this field indicates parsing of a jsr. |
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114 */ |
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115 final int jsrEntryBci; |
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116 |
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117 // We need to track the local variable in which the return address |
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118 // was stored to ensure we can handle inlining the jsr, because we |
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119 // don't handle arbitrary jsr/ret constructs. |
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120 int jsrRetAddrLocal; |
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121 |
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122 // If we are parsing a jsr, the continuation point for rets |
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123 BlockBegin jsrContinuation; |
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124 |
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125 final BlockBegin[] jsrDuplicatedBlocks; // blocks that have been duplicated for JSR inlining |
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126 |
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127 /** |
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128 * Constructs a new ScopeData instance with the specified parent ScopeData. |
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129 * @param parent the parent scope data |
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130 * @param scope the IR scope |
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131 * @param blockMap the block map for this scope |
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132 * @param stream the bytecode stream |
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133 * @param constantPool the constant pool |
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134 */ |
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135 public ScopeData(ScopeData parent, IRScope scope, BlockMap blockMap, BytecodeStream stream, RiConstantPool constantPool) { |
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136 this.parent = parent; |
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137 this.scope = scope; |
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138 this.blockMap = blockMap; |
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139 this.stream = stream; |
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140 this.constantPool = constantPool; |
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141 this.jsrEntryBci = -1; |
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142 this.jsrDuplicatedBlocks = null; |
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143 if (parent != null) { |
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144 maxInlineSize = (int) (C1XOptions.MaximumInlineRatio * parent.maxInlineSize()); |
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145 if (maxInlineSize < C1XOptions.MaximumTrivialSize) { |
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146 maxInlineSize = C1XOptions.MaximumTrivialSize; |
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147 } |
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148 if (parent.hasHandler()) { |
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149 flags |= HasHandler.mask; |
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150 } |
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151 if (parent.noSafepoints() || scope.method.noSafepoints()) { |
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152 flags |= NoSafepoints.mask; |
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153 } |
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154 } else { |
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155 maxInlineSize = C1XOptions.MaximumInlineSize; |
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156 if (scope.method.noSafepoints()) { |
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157 flags |= NoSafepoints.mask; |
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158 } |
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159 } |
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160 RiExceptionHandler[] handlers = scope.method.exceptionHandlers(); |
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161 if (handlers != null && handlers.length > 0) { |
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162 exceptionHandlers = new ArrayList<ExceptionHandler>(handlers.length); |
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163 for (RiExceptionHandler ch : handlers) { |
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164 ExceptionHandler h = new ExceptionHandler(ch); |
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165 h.setEntryBlock(blockAt(h.handler.handlerBCI())); |
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166 exceptionHandlers.add(h); |
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167 } |
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168 flags |= HasHandler.mask; |
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169 } |
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170 } |
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171 |
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172 /** |
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173 * Constructs a new ScopeData instance with the specified parent ScopeData. This constructor variant creates |
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174 * a scope data for parsing a JSR. |
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175 * @param parent the parent scope data |
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176 * @param scope the IR scope |
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177 * @param blockMap the block map for this scope |
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178 * @param stream the bytecode stream |
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179 * @param constantPool the constant pool |
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180 * @param jsrEntryBci the bytecode index of the entrypoint of the JSR |
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181 */ |
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182 public ScopeData(ScopeData parent, IRScope scope, BlockMap blockMap, BytecodeStream stream, RiConstantPool constantPool, int jsrEntryBci) { |
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183 this.parent = parent; |
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184 this.scope = scope; |
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185 this.blockMap = blockMap; |
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186 this.stream = stream; |
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187 this.constantPool = constantPool; |
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188 assert jsrEntryBci > 0 : "jsr cannot jump to BCI 0"; |
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189 assert parent != null : "jsr must have parent scope"; |
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190 this.jsrEntryBci = jsrEntryBci; |
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191 this.jsrDuplicatedBlocks = new BlockBegin[scope.method.code().length]; |
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192 this.jsrRetAddrLocal = -1; |
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193 |
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194 maxInlineSize = (int) (C1XOptions.MaximumInlineRatio * parent.maxInlineSize()); |
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195 if (maxInlineSize < C1XOptions.MaximumTrivialSize) { |
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196 maxInlineSize = C1XOptions.MaximumTrivialSize; |
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197 } |
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198 flags = parent.flags; |
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199 |
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200 // duplicate the parent scope's exception handlers, if any |
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201 List<ExceptionHandler> handlers = parent.exceptionHandlers(); |
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202 if (handlers != null && handlers.size() > 0) { |
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203 exceptionHandlers = new ArrayList<ExceptionHandler>(handlers.size()); |
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204 for (ExceptionHandler ph : handlers) { |
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205 ExceptionHandler h = new ExceptionHandler(ph); |
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206 int handlerBci = h.handler.handlerBCI(); |
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207 if (handlerBci >= 0) { |
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208 // need to duplicate the handler block because it is a "normal" handler |
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209 h.setEntryBlock(blockAt(handlerBci)); |
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210 } else { |
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211 // don't duplicate the handler block because it is a synchronization handler |
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212 // that was added by parsing/inlining a synchronized method |
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213 assert ph.entryBlock().checkBlockFlag(BlockBegin.BlockFlag.DefaultExceptionHandler); |
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214 h.setEntryBlock(ph.entryBlock()); |
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215 } |
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216 exceptionHandlers.add(h); |
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217 } |
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218 assert hasHandler(); |
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219 } |
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220 } |
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221 |
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222 /** |
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223 * Gets the block beginning at the specified bytecode index. Note that this method |
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224 * will clone the block if it the scope data is currently parsing a JSR. |
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225 * @param bci the bytecode index of the start of the block |
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226 * @return the block starting at the specified bytecode index |
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227 */ |
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228 public BlockBegin blockAt(int bci) { |
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229 if (jsrDuplicatedBlocks != null) { |
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230 // all blocks in a JSR are duplicated on demand using an internal array, |
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231 // including those for exception handlers in the scope of the method |
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232 // containing the jsr (because those exception handlers may contain ret |
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233 // instructions in some cases). |
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234 BlockBegin block = jsrDuplicatedBlocks[bci]; |
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235 if (block == null) { |
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236 BlockBegin p = this.parent.blockAt(bci); |
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237 if (p != null) { |
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238 BlockBegin newBlock = new BlockBegin(p.bci(), C1XCompilation.compilation().hir().nextBlockNumber()); |
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239 newBlock.setDepthFirstNumber(p.depthFirstNumber()); |
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240 newBlock.copyBlockFlags(p); |
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241 jsrDuplicatedBlocks[bci] = newBlock; |
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242 block = newBlock; |
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243 } |
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244 } |
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245 return block; |
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246 } |
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247 return blockMap.get(bci); |
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248 } |
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249 |
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250 /** |
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251 * Checks whether this scope has any handlers. |
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252 * @return {@code true} if there are any exception handlers |
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253 */ |
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254 public boolean hasHandler() { |
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255 return (flags & Flag.HasHandler.mask) != 0; |
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256 } |
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257 |
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258 /** |
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259 * Checks whether this scope can contain safepoints. |
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260 */ |
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261 public boolean noSafepoints() { |
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262 return (flags & Flag.NoSafepoints.mask) != 0; |
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263 } |
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264 |
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265 /** |
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266 * Gets the maximum inline size. |
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267 * @return the maximum inline size |
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268 */ |
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269 public int maxInlineSize() { |
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270 return maxInlineSize; |
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271 } |
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272 |
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273 /** |
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274 * Gets the size of the stack at the caller. |
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275 * @return the size of the stack |
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276 */ |
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277 public int callerStackSize() { |
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278 FrameState state = scope.callerState; |
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279 return state == null ? 0 : state.stackSize(); |
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280 } |
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281 |
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282 /** |
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283 * Gets the block continuation for this ScopeData. |
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284 * @return the continuation |
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285 */ |
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286 public BlockBegin continuation() { |
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287 return continuation; |
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288 } |
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289 |
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290 /** |
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291 * Sets the continuation for this ScopeData. |
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292 * @param continuation the continuation |
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293 */ |
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294 public void setContinuation(BlockBegin continuation) { |
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295 this.continuation = continuation; |
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296 } |
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297 |
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298 /** |
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299 * Gets the state at the continuation point. |
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300 * @return the state at the continuation point |
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301 */ |
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302 public FrameState continuationState() { |
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303 return continuationState; |
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304 } |
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305 |
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306 /** |
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307 * Sets the state at the continuation point. |
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308 * @param state the state at the continuation |
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309 */ |
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310 public void setContinuationState(FrameState state) { |
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311 continuationState = state; |
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312 } |
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313 |
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314 /** |
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315 * Checks whether this ScopeData is parsing a JSR. |
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316 * @return {@code true} if this scope data is parsing a JSR |
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317 */ |
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318 public boolean parsingJsr() { |
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319 return jsrEntryBci > 0; |
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320 } |
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321 |
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322 /** |
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323 * Gets the bytecode index for the JSR entry. |
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324 * @return the jsr entry bci |
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325 */ |
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326 public int jsrEntryBCI() { |
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327 return jsrEntryBci; |
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328 } |
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329 |
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330 /** |
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331 * Gets the index of the local variable containing the JSR return address. |
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332 * @return the index of the local with the JSR return address |
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333 */ |
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334 public int jsrEntryReturnAddressLocal() { |
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335 return jsrRetAddrLocal; |
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336 } |
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337 |
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338 /** |
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339 * Sets the index of the local variable containing the JSR return address. |
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340 * @param local the local |
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341 */ |
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342 public void setJsrEntryReturnAddressLocal(int local) { |
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343 jsrRetAddrLocal = local; |
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344 } |
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345 |
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346 /** |
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347 * Gets the continuation for parsing a JSR. |
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348 * @return the jsr continuation |
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349 */ |
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350 public BlockBegin jsrContinuation() { |
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351 return jsrContinuation; |
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352 } |
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353 |
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354 /** |
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355 * Sets the continuation for parsing a JSR. |
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356 * @param block the block that is the continuation |
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357 */ |
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358 public void setJsrContinuation(BlockBegin block) { |
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359 jsrContinuation = block; |
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360 } |
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361 |
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362 /** |
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363 * A block delimited by a return instruction in an inlined method. |
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364 */ |
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365 public static class ReturnBlock { |
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366 /** |
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367 * The inlined block. |
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368 */ |
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369 final BlockBegin block; |
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370 |
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371 /** |
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372 * The second last instruction in the block. That is, the one before the return instruction. |
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373 */ |
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374 final Instruction returnPredecessor; |
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375 |
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376 /** |
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377 * The frame state at the end of the block. |
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378 */ |
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379 final FrameState returnState; |
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380 |
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381 ReturnBlock(BlockBegin block, Instruction returnPredecessor, FrameState returnState) { |
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382 super(); |
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383 this.block = block; |
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384 this.returnPredecessor = returnPredecessor; |
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385 this.returnState = returnState; |
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386 } |
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387 |
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388 public static final ReturnBlock MULTIPLE_RETURNS = new ReturnBlock(null, null, null); |
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389 } |
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390 |
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391 /** |
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392 * Updates the info about blocks in this scope delimited by a return instruction. |
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393 * |
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394 * @param block a block delimited by a {@code return} instruction |
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395 * @param returnPredecessor the second last instruction in the block. That is, the one before the return instruction. |
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396 * @param returnState the frame state after the return instruction |
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397 */ |
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398 public void updateSimpleInlineInfo(BlockBegin block, Instruction returnPredecessor, FrameState returnState) { |
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399 if (inlinedReturnBlock == null) { |
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400 inlinedReturnBlock = new ReturnBlock(block, returnPredecessor, returnState); |
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401 } else { |
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402 inlinedReturnBlock = MULTIPLE_RETURNS; |
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403 } |
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404 } |
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405 |
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406 /** |
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407 * Gets the return block info for a simple inline scope. That is, a scope that contains only a |
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408 * single block delimited by a {@code return} instruction. |
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409 * |
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410 * @return the return block info for a simple inline scope or {@code null} if this is not a simple inline scope |
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411 */ |
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412 public ReturnBlock simpleInlineInfo() { |
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413 if (inlinedReturnBlock == MULTIPLE_RETURNS) { |
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414 return null; |
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415 } |
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416 return inlinedReturnBlock; |
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417 } |
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418 |
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419 /** |
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420 * Gets the list of exception handlers for this scope data. |
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421 * @return the list of exception handlers |
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422 */ |
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423 public List<ExceptionHandler> exceptionHandlers() { |
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424 return exceptionHandlers; |
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425 } |
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426 |
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427 /** |
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428 * Adds an exception handler to this scope data. |
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429 * @param handler the handler to add |
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430 */ |
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431 public void addExceptionHandler(ExceptionHandler handler) { |
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432 if (exceptionHandlers == null) { |
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433 exceptionHandlers = new ArrayList<ExceptionHandler>(); |
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434 } |
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435 assert !parsingJsr() : "jsr scope should already have all the handlers it needs"; |
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436 exceptionHandlers.add(handler); |
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437 flags |= HasHandler.mask; |
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438 } |
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439 |
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440 /** |
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441 * Adds a block to the worklist, if it is not already in the worklist. |
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442 * This method will keep the worklist topologically stored (i.e. the lower |
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443 * DFNs are earlier in the list). |
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444 * @param block the block to add to the work list |
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445 */ |
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446 public void addToWorkList(BlockBegin block) { |
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447 if (!block.isOnWorkList()) { |
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448 if (block == continuation || block == jsrContinuation) { |
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449 return; |
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450 } |
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451 block.setOnWorkList(true); |
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452 sortIntoWorkList(block); |
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453 } |
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454 } |
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455 |
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456 private void sortIntoWorkList(BlockBegin top) { |
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457 // XXX: this is O(n), since the whole list is sorted; a heap could achieve O(nlogn), but |
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458 // would only pay off for large worklists |
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459 if (workList == null) { |
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460 // need to allocate the worklist |
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461 workList = new BlockBegin[5]; |
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462 } else if (workListIndex == workList.length) { |
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463 // need to grow the worklist |
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464 BlockBegin[] nworkList = new BlockBegin[workList.length * 3]; |
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465 System.arraycopy(workList, 0, nworkList, 0, workList.length); |
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466 workList = nworkList; |
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467 } |
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468 // put the block at the end of the array |
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469 workList[workListIndex++] = top; |
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470 int dfn = top.depthFirstNumber(); |
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471 assert dfn >= 0 : top + " does not have a depth first number"; |
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472 int i = workListIndex - 2; |
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473 // push top towards the beginning of the array |
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474 for (; i >= 0; i--) { |
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475 BlockBegin b = workList[i]; |
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476 if (b.depthFirstNumber() >= dfn) { |
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477 break; // already in the right position |
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478 } |
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479 workList[i + 1] = b; // bubble b down by one |
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480 workList[i] = top; // and overwrite it with top |
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481 } |
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482 } |
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483 |
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484 /** |
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485 * Removes the next block from the worklist. The list is sorted topologically, so the |
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486 * block with the lowest depth first number in the list will be removed and returned. |
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487 * @return the next block from the worklist; {@code null} if there are no blocks |
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488 * in the worklist |
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489 */ |
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490 public BlockBegin removeFromWorkList() { |
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491 if (workListIndex == 0) { |
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492 return null; |
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493 } |
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494 // pop the last item off the end |
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495 return workList[--workListIndex]; |
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496 } |
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497 |
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498 /** |
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499 * Converts this scope data to a string for debugging purposes. |
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500 * @return a string representation of this scope data |
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501 */ |
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502 @Override |
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503 public String toString() { |
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504 if (parsingJsr()) { |
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505 return "jsr@" + jsrEntryBci + " data for " + scope.toString(); |
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506 } else { |
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507 return "data for " + scope.toString(); |
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508 } |
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509 |
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510 } |
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511 } |