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1 /* |
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2 * Copyright 1997-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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20 * CA 95054 USA or visit www.sun.com if you need additional information or |
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21 * have any questions. |
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22 * |
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23 */ |
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24 |
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25 // |
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26 // |
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27 // Compute stack layouts for each instruction in method. |
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28 // |
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29 // Problems: |
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30 // - What to do about jsr with different types of local vars? |
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31 // Need maps that are conditional on jsr path? |
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32 // - Jsr and exceptions should be done more efficiently (the retAddr stuff) |
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33 // |
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34 // Alternative: |
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35 // - Could extend verifier to provide this information. |
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36 // For: one fewer abstract interpreter to maintain. Against: the verifier |
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37 // solves a bigger problem so slower (undesirable to force verification of |
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38 // everything?). |
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39 // |
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40 // Algorithm: |
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41 // Partition bytecodes into basic blocks |
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42 // For each basic block: store entry state (vars, stack). For instructions |
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43 // inside basic blocks we do not store any state (instead we recompute it |
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44 // from state produced by previous instruction). |
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45 // |
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46 // Perform abstract interpretation of bytecodes over this lattice: |
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47 // |
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48 // _--'#'--_ |
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49 // / / \ \ |
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50 // / / \ \ |
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51 // / | | \ |
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52 // 'r' 'v' 'p' ' ' |
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53 // \ | | / |
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54 // \ \ / / |
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55 // \ \ / / |
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56 // -- '@' -- |
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57 // |
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58 // '#' top, result of conflict merge |
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59 // 'r' reference type |
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60 // 'v' value type |
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61 // 'p' pc type for jsr/ret |
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62 // ' ' uninitialized; never occurs on operand stack in Java |
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63 // '@' bottom/unexecuted; initial state each bytecode. |
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64 // |
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65 // Basic block headers are the only merge points. We use this iteration to |
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66 // compute the information: |
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67 // |
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68 // find basic blocks; |
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69 // initialize them with uninitialized state; |
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70 // initialize first BB according to method signature; |
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71 // mark first BB changed |
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72 // while (some BB is changed) do { |
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73 // perform abstract interpration of all bytecodes in BB; |
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74 // merge exit state of BB into entry state of all successor BBs, |
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75 // noting if any of these change; |
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76 // } |
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77 // |
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78 // One additional complication is necessary. The jsr instruction pushes |
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79 // a return PC on the stack (a 'p' type in the abstract interpretation). |
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80 // To be able to process "ret" bytecodes, we keep track of these return |
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81 // PC's in a 'retAddrs' structure in abstract interpreter context (when |
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82 // processing a "ret" bytecodes, it is not sufficient to know that it gets |
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83 // an argument of the right type 'p'; we need to know which address it |
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84 // returns to). |
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85 // |
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86 // (Note this comment is borrowed form the original author of the algorithm) |
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87 |
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88 #include "incls/_precompiled.incl" |
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89 #include "incls/_generateOopMap.cpp.incl" |
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90 |
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91 // ComputeCallStack |
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92 // |
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93 // Specialization of SignatureIterator - compute the effects of a call |
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94 // |
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95 class ComputeCallStack : public SignatureIterator { |
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96 CellTypeState *_effect; |
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97 int _idx; |
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98 |
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99 void setup(); |
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100 void set(CellTypeState state) { _effect[_idx++] = state; } |
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101 int length() { return _idx; }; |
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102 |
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103 virtual void do_bool () { set(CellTypeState::value); }; |
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104 virtual void do_char () { set(CellTypeState::value); }; |
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105 virtual void do_float () { set(CellTypeState::value); }; |
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106 virtual void do_byte () { set(CellTypeState::value); }; |
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107 virtual void do_short () { set(CellTypeState::value); }; |
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108 virtual void do_int () { set(CellTypeState::value); }; |
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109 virtual void do_void () { set(CellTypeState::bottom);}; |
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110 virtual void do_object(int begin, int end) { set(CellTypeState::ref); }; |
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111 virtual void do_array (int begin, int end) { set(CellTypeState::ref); }; |
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112 |
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113 void do_double() { set(CellTypeState::value); |
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114 set(CellTypeState::value); } |
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115 void do_long () { set(CellTypeState::value); |
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116 set(CellTypeState::value); } |
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117 |
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118 public: |
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119 ComputeCallStack(symbolOop signature) : SignatureIterator(signature) {}; |
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120 |
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121 // Compute methods |
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122 int compute_for_parameters(bool is_static, CellTypeState *effect) { |
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123 _idx = 0; |
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124 _effect = effect; |
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125 |
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126 if (!is_static) |
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127 effect[_idx++] = CellTypeState::ref; |
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128 |
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129 iterate_parameters(); |
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130 |
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131 return length(); |
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132 }; |
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133 |
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134 int compute_for_returntype(CellTypeState *effect) { |
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135 _idx = 0; |
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136 _effect = effect; |
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137 iterate_returntype(); |
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138 set(CellTypeState::bottom); // Always terminate with a bottom state, so ppush works |
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139 |
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140 return length(); |
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141 } |
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142 }; |
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143 |
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144 //========================================================================================= |
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145 // ComputeEntryStack |
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146 // |
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147 // Specialization of SignatureIterator - in order to set up first stack frame |
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148 // |
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149 class ComputeEntryStack : public SignatureIterator { |
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150 CellTypeState *_effect; |
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151 int _idx; |
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152 |
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153 void setup(); |
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154 void set(CellTypeState state) { _effect[_idx++] = state; } |
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155 int length() { return _idx; }; |
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156 |
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157 virtual void do_bool () { set(CellTypeState::value); }; |
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158 virtual void do_char () { set(CellTypeState::value); }; |
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159 virtual void do_float () { set(CellTypeState::value); }; |
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160 virtual void do_byte () { set(CellTypeState::value); }; |
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161 virtual void do_short () { set(CellTypeState::value); }; |
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162 virtual void do_int () { set(CellTypeState::value); }; |
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163 virtual void do_void () { set(CellTypeState::bottom);}; |
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164 virtual void do_object(int begin, int end) { set(CellTypeState::make_slot_ref(_idx)); } |
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165 virtual void do_array (int begin, int end) { set(CellTypeState::make_slot_ref(_idx)); } |
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166 |
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167 void do_double() { set(CellTypeState::value); |
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168 set(CellTypeState::value); } |
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169 void do_long () { set(CellTypeState::value); |
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170 set(CellTypeState::value); } |
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171 |
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172 public: |
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173 ComputeEntryStack(symbolOop signature) : SignatureIterator(signature) {}; |
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174 |
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175 // Compute methods |
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176 int compute_for_parameters(bool is_static, CellTypeState *effect) { |
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177 _idx = 0; |
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178 _effect = effect; |
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179 |
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180 if (!is_static) |
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181 effect[_idx++] = CellTypeState::make_slot_ref(0); |
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182 |
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183 iterate_parameters(); |
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184 |
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185 return length(); |
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186 }; |
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187 |
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188 int compute_for_returntype(CellTypeState *effect) { |
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189 _idx = 0; |
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190 _effect = effect; |
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191 iterate_returntype(); |
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192 set(CellTypeState::bottom); // Always terminate with a bottom state, so ppush works |
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193 |
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194 return length(); |
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195 } |
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196 }; |
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197 |
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198 //===================================================================================== |
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199 // |
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200 // Implementation of RetTable/RetTableEntry |
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201 // |
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202 // Contains function to itereate through all bytecodes |
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203 // and find all return entry points |
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204 // |
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205 int RetTable::_init_nof_entries = 10; |
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206 int RetTableEntry::_init_nof_jsrs = 5; |
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207 |
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208 void RetTableEntry::add_delta(int bci, int delta) { |
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209 if (_target_bci > bci) _target_bci += delta; |
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210 |
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211 for (int k = 0; k < _jsrs->length(); k++) { |
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212 int jsr = _jsrs->at(k); |
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213 if (jsr > bci) _jsrs->at_put(k, jsr+delta); |
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214 } |
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215 } |
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216 |
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217 void RetTable::compute_ret_table(methodHandle method) { |
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218 BytecodeStream i(method); |
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219 Bytecodes::Code bytecode; |
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220 |
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221 while( (bytecode = i.next()) >= 0) { |
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222 switch (bytecode) { |
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223 case Bytecodes::_jsr: |
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224 add_jsr(i.next_bci(), i.dest()); |
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225 break; |
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226 case Bytecodes::_jsr_w: |
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227 add_jsr(i.next_bci(), i.dest_w()); |
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228 break; |
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229 } |
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230 } |
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231 } |
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232 |
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233 void RetTable::add_jsr(int return_bci, int target_bci) { |
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234 RetTableEntry* entry = _first; |
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235 |
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236 // Scan table for entry |
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237 for (;entry && entry->target_bci() != target_bci; entry = entry->next()); |
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238 |
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239 if (!entry) { |
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240 // Allocate new entry and put in list |
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241 entry = new RetTableEntry(target_bci, _first); |
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242 _first = entry; |
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243 } |
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244 |
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245 // Now "entry" is set. Make sure that the entry is initialized |
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246 // and has room for the new jsr. |
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247 entry->add_jsr(return_bci); |
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248 } |
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249 |
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250 RetTableEntry* RetTable::find_jsrs_for_target(int targBci) { |
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251 RetTableEntry *cur = _first; |
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252 |
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253 while(cur) { |
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254 assert(cur->target_bci() != -1, "sanity check"); |
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255 if (cur->target_bci() == targBci) return cur; |
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256 cur = cur->next(); |
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257 } |
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258 ShouldNotReachHere(); |
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259 return NULL; |
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260 } |
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261 |
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262 // The instruction at bci is changing size by "delta". Update the return map. |
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263 void RetTable::update_ret_table(int bci, int delta) { |
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264 RetTableEntry *cur = _first; |
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265 while(cur) { |
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266 cur->add_delta(bci, delta); |
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267 cur = cur->next(); |
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268 } |
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269 } |
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270 |
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271 // |
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272 // Celltype state |
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273 // |
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274 |
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275 CellTypeState CellTypeState::bottom = CellTypeState::make_bottom(); |
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276 CellTypeState CellTypeState::uninit = CellTypeState::make_any(uninit_value); |
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277 CellTypeState CellTypeState::ref = CellTypeState::make_any(ref_conflict); |
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278 CellTypeState CellTypeState::value = CellTypeState::make_any(val_value); |
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279 CellTypeState CellTypeState::refUninit = CellTypeState::make_any(ref_conflict | uninit_value); |
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280 CellTypeState CellTypeState::top = CellTypeState::make_top(); |
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281 CellTypeState CellTypeState::addr = CellTypeState::make_any(addr_conflict); |
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282 |
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283 // Commonly used constants |
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284 static CellTypeState epsilonCTS[1] = { CellTypeState::bottom }; |
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285 static CellTypeState refCTS = CellTypeState::ref; |
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286 static CellTypeState valCTS = CellTypeState::value; |
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287 static CellTypeState vCTS[2] = { CellTypeState::value, CellTypeState::bottom }; |
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288 static CellTypeState rCTS[2] = { CellTypeState::ref, CellTypeState::bottom }; |
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289 static CellTypeState rrCTS[3] = { CellTypeState::ref, CellTypeState::ref, CellTypeState::bottom }; |
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290 static CellTypeState vrCTS[3] = { CellTypeState::value, CellTypeState::ref, CellTypeState::bottom }; |
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291 static CellTypeState vvCTS[3] = { CellTypeState::value, CellTypeState::value, CellTypeState::bottom }; |
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292 static CellTypeState rvrCTS[4] = { CellTypeState::ref, CellTypeState::value, CellTypeState::ref, CellTypeState::bottom }; |
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293 static CellTypeState vvrCTS[4] = { CellTypeState::value, CellTypeState::value, CellTypeState::ref, CellTypeState::bottom }; |
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294 static CellTypeState vvvCTS[4] = { CellTypeState::value, CellTypeState::value, CellTypeState::value, CellTypeState::bottom }; |
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295 static CellTypeState vvvrCTS[5] = { CellTypeState::value, CellTypeState::value, CellTypeState::value, CellTypeState::ref, CellTypeState::bottom }; |
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296 static CellTypeState vvvvCTS[5] = { CellTypeState::value, CellTypeState::value, CellTypeState::value, CellTypeState::value, CellTypeState::bottom }; |
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297 |
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298 char CellTypeState::to_char() const { |
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299 if (can_be_reference()) { |
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300 if (can_be_value() || can_be_address()) |
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301 return '#'; // Conflict that needs to be rewritten |
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302 else |
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303 return 'r'; |
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304 } else if (can_be_value()) |
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305 return 'v'; |
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306 else if (can_be_address()) |
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307 return 'p'; |
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308 else if (can_be_uninit()) |
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309 return ' '; |
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310 else |
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311 return '@'; |
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312 } |
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313 |
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314 |
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315 // Print a detailed CellTypeState. Indicate all bits that are set. If |
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316 // the CellTypeState represents an address or a reference, print the |
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317 // value of the additional information. |
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318 void CellTypeState::print(outputStream *os) { |
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319 if (can_be_address()) { |
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320 os->print("(p"); |
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321 } else { |
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322 os->print("( "); |
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323 } |
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324 if (can_be_reference()) { |
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325 os->print("r"); |
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326 } else { |
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327 os->print(" "); |
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328 } |
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329 if (can_be_value()) { |
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330 os->print("v"); |
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331 } else { |
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332 os->print(" "); |
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333 } |
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334 if (can_be_uninit()) { |
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335 os->print("u|"); |
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336 } else { |
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337 os->print(" |"); |
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338 } |
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339 if (is_info_top()) { |
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340 os->print("Top)"); |
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341 } else if (is_info_bottom()) { |
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342 os->print("Bot)"); |
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343 } else { |
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344 if (is_reference()) { |
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345 int info = get_info(); |
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346 int data = info & ~(ref_not_lock_bit | ref_slot_bit); |
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347 if (info & ref_not_lock_bit) { |
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348 // Not a monitor lock reference. |
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349 if (info & ref_slot_bit) { |
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350 // slot |
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351 os->print("slot%d)", data); |
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352 } else { |
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353 // line |
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354 os->print("line%d)", data); |
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355 } |
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356 } else { |
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357 // lock |
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358 os->print("lock%d)", data); |
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359 } |
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360 } else { |
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361 os->print("%d)", get_info()); |
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362 } |
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363 } |
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364 } |
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365 |
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366 // |
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367 // Basicblock handling methods |
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368 // |
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369 |
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370 void GenerateOopMap ::initialize_bb() { |
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371 _gc_points = 0; |
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372 _bb_count = 0; |
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373 int size = binsToHold(method()->code_size()); |
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374 _bb_hdr_bits = NEW_RESOURCE_ARRAY(uintptr_t,size); |
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375 memset(_bb_hdr_bits, 0, size*sizeof(uintptr_t)); |
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376 } |
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377 |
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378 void GenerateOopMap ::set_bbmark_bit(int bci) { |
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379 int idx = bci >> LogBitsPerWord; |
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380 uintptr_t bit = (uintptr_t)1 << (bci & (BitsPerWord-1)); |
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381 _bb_hdr_bits[idx] |= bit; |
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382 } |
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383 |
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384 void GenerateOopMap ::clear_bbmark_bit(int bci) { |
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385 int idx = bci >> LogBitsPerWord; |
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386 uintptr_t bit = (uintptr_t)1 << (bci & (BitsPerWord-1)); |
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387 _bb_hdr_bits[idx] &= (~bit); |
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388 } |
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389 |
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390 void GenerateOopMap::bb_mark_fct(GenerateOopMap *c, int bci, int *data) { |
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391 assert(bci>= 0 && bci < c->method()->code_size(), "index out of bounds"); |
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392 if (c->is_bb_header(bci)) |
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393 return; |
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394 |
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395 if (TraceNewOopMapGeneration) { |
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396 tty->print_cr("Basicblock#%d begins at: %d", c->_bb_count, bci); |
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397 } |
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398 c->set_bbmark_bit(bci); |
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399 c->_bb_count++; |
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400 } |
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401 |
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402 |
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403 void GenerateOopMap::mark_bbheaders_and_count_gc_points() { |
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404 initialize_bb(); |
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405 |
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406 bool fellThrough = false; // False to get first BB marked. |
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407 |
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408 // First mark all exception handlers as start of a basic-block |
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409 typeArrayOop excps = method()->exception_table(); |
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410 for(int i = 0; i < excps->length(); i += 4) { |
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411 int handler_pc_idx = i+2; |
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412 bb_mark_fct(this, excps->int_at(handler_pc_idx), NULL); |
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413 } |
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414 |
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415 // Then iterate through the code |
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416 BytecodeStream bcs(_method); |
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417 Bytecodes::Code bytecode; |
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418 |
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419 while( (bytecode = bcs.next()) >= 0) { |
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420 int bci = bcs.bci(); |
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421 |
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422 if (!fellThrough) |
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423 bb_mark_fct(this, bci, NULL); |
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424 |
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425 fellThrough = jump_targets_do(&bcs, &GenerateOopMap::bb_mark_fct, NULL); |
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426 |
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427 /* We will also mark successors of jsr's as basic block headers. */ |
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428 switch (bytecode) { |
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429 case Bytecodes::_jsr: |
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430 assert(!fellThrough, "should not happen"); |
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431 bb_mark_fct(this, bci + Bytecodes::length_for(bytecode), NULL); |
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432 break; |
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433 case Bytecodes::_jsr_w: |
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434 assert(!fellThrough, "should not happen"); |
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435 bb_mark_fct(this, bci + Bytecodes::length_for(bytecode), NULL); |
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436 break; |
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437 } |
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438 |
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439 if (possible_gc_point(&bcs)) |
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440 _gc_points++; |
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441 } |
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442 } |
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443 |
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444 void GenerateOopMap::reachable_basicblock(GenerateOopMap *c, int bci, int *data) { |
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445 assert(bci>= 0 && bci < c->method()->code_size(), "index out of bounds"); |
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446 BasicBlock* bb = c->get_basic_block_at(bci); |
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447 if (bb->is_dead()) { |
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448 bb->mark_as_alive(); |
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449 *data = 1; // Mark basicblock as changed |
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450 } |
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451 } |
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452 |
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453 |
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454 void GenerateOopMap::mark_reachable_code() { |
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455 int change = 1; // int to get function pointers to work |
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456 |
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457 // Mark entry basic block as alive and all exception handlers |
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458 _basic_blocks[0].mark_as_alive(); |
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459 typeArrayOop excps = method()->exception_table(); |
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460 for(int i = 0; i < excps->length(); i += 4) { |
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461 int handler_pc_idx = i+2; |
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462 BasicBlock *bb = get_basic_block_at(excps->int_at(handler_pc_idx)); |
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463 // If block is not already alive (due to multiple exception handlers to same bb), then |
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464 // make it alive |
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465 if (bb->is_dead()) bb->mark_as_alive(); |
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466 } |
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467 |
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468 BytecodeStream bcs(_method); |
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469 |
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470 // Iterate through all basic blocks until we reach a fixpoint |
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471 while (change) { |
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472 change = 0; |
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473 |
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474 for (int i = 0; i < _bb_count; i++) { |
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475 BasicBlock *bb = &_basic_blocks[i]; |
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476 if (bb->is_alive()) { |
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477 // Position bytecodestream at last bytecode in basicblock |
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478 bcs.set_start(bb->_end_bci); |
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479 bcs.next(); |
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480 Bytecodes::Code bytecode = bcs.code(); |
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481 int bci = bcs.bci(); |
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482 assert(bci == bb->_end_bci, "wrong bci"); |
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483 |
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484 bool fell_through = jump_targets_do(&bcs, &GenerateOopMap::reachable_basicblock, &change); |
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485 |
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486 // We will also mark successors of jsr's as alive. |
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487 switch (bytecode) { |
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488 case Bytecodes::_jsr: |
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489 case Bytecodes::_jsr_w: |
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490 assert(!fell_through, "should not happen"); |
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491 reachable_basicblock(this, bci + Bytecodes::length_for(bytecode), &change); |
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492 break; |
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493 } |
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494 if (fell_through) { |
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495 // Mark successor as alive |
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496 if (bb[1].is_dead()) { |
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497 bb[1].mark_as_alive(); |
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498 change = 1; |
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499 } |
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500 } |
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501 } |
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502 } |
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503 } |
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504 } |
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505 |
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506 /* If the current instruction in "c" has no effect on control flow, |
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507 returns "true". Otherwise, calls "jmpFct" one or more times, with |
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508 "c", an appropriate "pcDelta", and "data" as arguments, then |
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509 returns "false". There is one exception: if the current |
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510 instruction is a "ret", returns "false" without calling "jmpFct". |
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511 Arrangements for tracking the control flow of a "ret" must be made |
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512 externally. */ |
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513 bool GenerateOopMap::jump_targets_do(BytecodeStream *bcs, jmpFct_t jmpFct, int *data) { |
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514 int bci = bcs->bci(); |
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515 |
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516 switch (bcs->code()) { |
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517 case Bytecodes::_ifeq: |
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518 case Bytecodes::_ifne: |
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519 case Bytecodes::_iflt: |
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520 case Bytecodes::_ifge: |
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521 case Bytecodes::_ifgt: |
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522 case Bytecodes::_ifle: |
|
523 case Bytecodes::_if_icmpeq: |
|
524 case Bytecodes::_if_icmpne: |
|
525 case Bytecodes::_if_icmplt: |
|
526 case Bytecodes::_if_icmpge: |
|
527 case Bytecodes::_if_icmpgt: |
|
528 case Bytecodes::_if_icmple: |
|
529 case Bytecodes::_if_acmpeq: |
|
530 case Bytecodes::_if_acmpne: |
|
531 case Bytecodes::_ifnull: |
|
532 case Bytecodes::_ifnonnull: |
|
533 (*jmpFct)(this, bcs->dest(), data); |
|
534 (*jmpFct)(this, bci + 3, data); |
|
535 break; |
|
536 |
|
537 case Bytecodes::_goto: |
|
538 (*jmpFct)(this, bcs->dest(), data); |
|
539 break; |
|
540 case Bytecodes::_goto_w: |
|
541 (*jmpFct)(this, bcs->dest_w(), data); |
|
542 break; |
|
543 case Bytecodes::_tableswitch: |
|
544 { Bytecode_tableswitch *tableswitch = Bytecode_tableswitch_at(bcs->bcp()); |
|
545 int len = tableswitch->length(); |
|
546 |
|
547 (*jmpFct)(this, bci + tableswitch->default_offset(), data); /* Default. jump address */ |
|
548 while (--len >= 0) { |
|
549 (*jmpFct)(this, bci + tableswitch->dest_offset_at(len), data); |
|
550 } |
|
551 break; |
|
552 } |
|
553 |
|
554 case Bytecodes::_lookupswitch: |
|
555 { Bytecode_lookupswitch *lookupswitch = Bytecode_lookupswitch_at(bcs->bcp()); |
|
556 int npairs = lookupswitch->number_of_pairs(); |
|
557 (*jmpFct)(this, bci + lookupswitch->default_offset(), data); /* Default. */ |
|
558 while(--npairs >= 0) { |
|
559 LookupswitchPair *pair = lookupswitch->pair_at(npairs); |
|
560 (*jmpFct)(this, bci + pair->offset(), data); |
|
561 } |
|
562 break; |
|
563 } |
|
564 case Bytecodes::_jsr: |
|
565 assert(bcs->is_wide()==false, "sanity check"); |
|
566 (*jmpFct)(this, bcs->dest(), data); |
|
567 |
|
568 |
|
569 |
|
570 break; |
|
571 case Bytecodes::_jsr_w: |
|
572 (*jmpFct)(this, bcs->dest_w(), data); |
|
573 break; |
|
574 case Bytecodes::_wide: |
|
575 ShouldNotReachHere(); |
|
576 return true; |
|
577 break; |
|
578 case Bytecodes::_athrow: |
|
579 case Bytecodes::_ireturn: |
|
580 case Bytecodes::_lreturn: |
|
581 case Bytecodes::_freturn: |
|
582 case Bytecodes::_dreturn: |
|
583 case Bytecodes::_areturn: |
|
584 case Bytecodes::_return: |
|
585 case Bytecodes::_ret: |
|
586 break; |
|
587 default: |
|
588 return true; |
|
589 } |
|
590 return false; |
|
591 } |
|
592 |
|
593 /* Requires "pc" to be the head of a basic block; returns that basic |
|
594 block. */ |
|
595 BasicBlock *GenerateOopMap::get_basic_block_at(int bci) const { |
|
596 BasicBlock* bb = get_basic_block_containing(bci); |
|
597 assert(bb->_bci == bci, "should have found BB"); |
|
598 return bb; |
|
599 } |
|
600 |
|
601 // Requires "pc" to be the start of an instruction; returns the basic |
|
602 // block containing that instruction. */ |
|
603 BasicBlock *GenerateOopMap::get_basic_block_containing(int bci) const { |
|
604 BasicBlock *bbs = _basic_blocks; |
|
605 int lo = 0, hi = _bb_count - 1; |
|
606 |
|
607 while (lo <= hi) { |
|
608 int m = (lo + hi) / 2; |
|
609 int mbci = bbs[m]._bci; |
|
610 int nbci; |
|
611 |
|
612 if ( m == _bb_count-1) { |
|
613 assert( bci >= mbci && bci < method()->code_size(), "sanity check failed"); |
|
614 return bbs+m; |
|
615 } else { |
|
616 nbci = bbs[m+1]._bci; |
|
617 } |
|
618 |
|
619 if ( mbci <= bci && bci < nbci) { |
|
620 return bbs+m; |
|
621 } else if (mbci < bci) { |
|
622 lo = m + 1; |
|
623 } else { |
|
624 assert(mbci > bci, "sanity check"); |
|
625 hi = m - 1; |
|
626 } |
|
627 } |
|
628 |
|
629 fatal("should have found BB"); |
|
630 return NULL; |
|
631 } |
|
632 |
|
633 void GenerateOopMap::restore_state(BasicBlock *bb) |
|
634 { |
|
635 memcpy(_state, bb->_state, _state_len*sizeof(CellTypeState)); |
|
636 _stack_top = bb->_stack_top; |
|
637 _monitor_top = bb->_monitor_top; |
|
638 } |
|
639 |
|
640 int GenerateOopMap::next_bb_start_pc(BasicBlock *bb) { |
|
641 int bbNum = bb - _basic_blocks + 1; |
|
642 if (bbNum == _bb_count) |
|
643 return method()->code_size(); |
|
644 |
|
645 return _basic_blocks[bbNum]._bci; |
|
646 } |
|
647 |
|
648 // |
|
649 // CellType handling methods |
|
650 // |
|
651 |
|
652 void GenerateOopMap::init_state() { |
|
653 _state_len = _max_locals + _max_stack + _max_monitors; |
|
654 _state = NEW_RESOURCE_ARRAY(CellTypeState, _state_len); |
|
655 memset(_state, 0, _state_len * sizeof(CellTypeState)); |
|
656 _state_vec_buf = NEW_RESOURCE_ARRAY(char, MAX3(_max_locals, _max_stack, _max_monitors) + 1/*for null terminator char */); |
|
657 } |
|
658 |
|
659 void GenerateOopMap::make_context_uninitialized() { |
|
660 CellTypeState* vs = vars(); |
|
661 |
|
662 for (int i = 0; i < _max_locals; i++) |
|
663 vs[i] = CellTypeState::uninit; |
|
664 |
|
665 _stack_top = 0; |
|
666 _monitor_top = 0; |
|
667 } |
|
668 |
|
669 int GenerateOopMap::methodsig_to_effect(symbolOop signature, bool is_static, CellTypeState* effect) { |
|
670 ComputeEntryStack ces(signature); |
|
671 return ces.compute_for_parameters(is_static, effect); |
|
672 } |
|
673 |
|
674 // Return result of merging cts1 and cts2. |
|
675 CellTypeState CellTypeState::merge(CellTypeState cts, int slot) const { |
|
676 CellTypeState result; |
|
677 |
|
678 assert(!is_bottom() && !cts.is_bottom(), |
|
679 "merge of bottom values is handled elsewhere"); |
|
680 |
|
681 result._state = _state | cts._state; |
|
682 |
|
683 // If the top bit is set, we don't need to do any more work. |
|
684 if (!result.is_info_top()) { |
|
685 assert((result.can_be_address() || result.can_be_reference()), |
|
686 "only addresses and references have non-top info"); |
|
687 |
|
688 if (!equal(cts)) { |
|
689 // The two values being merged are different. Raise to top. |
|
690 if (result.is_reference()) { |
|
691 result = CellTypeState::make_slot_ref(slot); |
|
692 } else { |
|
693 result._state |= info_conflict; |
|
694 } |
|
695 } |
|
696 } |
|
697 assert(result.is_valid_state(), "checking that CTS merge maintains legal state"); |
|
698 |
|
699 return result; |
|
700 } |
|
701 |
|
702 // Merge the variable state for locals and stack from cts into bbts. |
|
703 bool GenerateOopMap::merge_local_state_vectors(CellTypeState* cts, |
|
704 CellTypeState* bbts) { |
|
705 int i; |
|
706 int len = _max_locals + _stack_top; |
|
707 bool change = false; |
|
708 |
|
709 for (i = len - 1; i >= 0; i--) { |
|
710 CellTypeState v = cts[i].merge(bbts[i], i); |
|
711 change = change || !v.equal(bbts[i]); |
|
712 bbts[i] = v; |
|
713 } |
|
714 |
|
715 return change; |
|
716 } |
|
717 |
|
718 // Merge the monitor stack state from cts into bbts. |
|
719 bool GenerateOopMap::merge_monitor_state_vectors(CellTypeState* cts, |
|
720 CellTypeState* bbts) { |
|
721 bool change = false; |
|
722 if (_max_monitors > 0 && _monitor_top != bad_monitors) { |
|
723 // If there are no monitors in the program, or there has been |
|
724 // a monitor matching error before this point in the program, |
|
725 // then we do not merge in the monitor state. |
|
726 |
|
727 int base = _max_locals + _max_stack; |
|
728 int len = base + _monitor_top; |
|
729 for (int i = len - 1; i >= base; i--) { |
|
730 CellTypeState v = cts[i].merge(bbts[i], i); |
|
731 |
|
732 // Can we prove that, when there has been a change, it will already |
|
733 // have been detected at this point? That would make this equal |
|
734 // check here unnecessary. |
|
735 change = change || !v.equal(bbts[i]); |
|
736 bbts[i] = v; |
|
737 } |
|
738 } |
|
739 |
|
740 return change; |
|
741 } |
|
742 |
|
743 void GenerateOopMap::copy_state(CellTypeState *dst, CellTypeState *src) { |
|
744 int len = _max_locals + _stack_top; |
|
745 for (int i = 0; i < len; i++) { |
|
746 if (src[i].is_nonlock_reference()) { |
|
747 dst[i] = CellTypeState::make_slot_ref(i); |
|
748 } else { |
|
749 dst[i] = src[i]; |
|
750 } |
|
751 } |
|
752 if (_max_monitors > 0 && _monitor_top != bad_monitors) { |
|
753 int base = _max_locals + _max_stack; |
|
754 len = base + _monitor_top; |
|
755 for (int i = base; i < len; i++) { |
|
756 dst[i] = src[i]; |
|
757 } |
|
758 } |
|
759 } |
|
760 |
|
761 |
|
762 // Merge the states for the current block and the next. As long as a |
|
763 // block is reachable the locals and stack must be merged. If the |
|
764 // stack heights don't match then this is a verification error and |
|
765 // it's impossible to interpret the code. Simultaneously monitor |
|
766 // states are being check to see if they nest statically. If monitor |
|
767 // depths match up then their states are merged. Otherwise the |
|
768 // mismatch is simply recorded and interpretation continues since |
|
769 // monitor matching is purely informational and doesn't say anything |
|
770 // about the correctness of the code. |
|
771 void GenerateOopMap::merge_state_into_bb(BasicBlock *bb) { |
|
772 assert(bb->is_alive(), "merging state into a dead basicblock"); |
|
773 |
|
774 if (_stack_top == bb->_stack_top) { |
|
775 // always merge local state even if monitors don't match. |
|
776 if (merge_local_state_vectors(_state, bb->_state)) { |
|
777 bb->set_changed(true); |
|
778 } |
|
779 if (_monitor_top == bb->_monitor_top) { |
|
780 // monitors still match so continue merging monitor states. |
|
781 if (merge_monitor_state_vectors(_state, bb->_state)) { |
|
782 bb->set_changed(true); |
|
783 } |
|
784 } else { |
|
785 if (TraceMonitorMismatch) { |
|
786 report_monitor_mismatch("monitor stack height merge conflict"); |
|
787 } |
|
788 // When the monitor stacks are not matched, we set _monitor_top to |
|
789 // bad_monitors. This signals that, from here on, the monitor stack cannot |
|
790 // be trusted. In particular, monitorexit bytecodes may throw |
|
791 // exceptions. We mark this block as changed so that the change |
|
792 // propagates properly. |
|
793 bb->_monitor_top = bad_monitors; |
|
794 bb->set_changed(true); |
|
795 _monitor_safe = false; |
|
796 } |
|
797 } else if (!bb->is_reachable()) { |
|
798 // First time we look at this BB |
|
799 copy_state(bb->_state, _state); |
|
800 bb->_stack_top = _stack_top; |
|
801 bb->_monitor_top = _monitor_top; |
|
802 bb->set_changed(true); |
|
803 } else { |
|
804 verify_error("stack height conflict: %d vs. %d", _stack_top, bb->_stack_top); |
|
805 } |
|
806 } |
|
807 |
|
808 void GenerateOopMap::merge_state(GenerateOopMap *gom, int bci, int* data) { |
|
809 gom->merge_state_into_bb(gom->get_basic_block_at(bci)); |
|
810 } |
|
811 |
|
812 void GenerateOopMap::set_var(int localNo, CellTypeState cts) { |
|
813 assert(cts.is_reference() || cts.is_value() || cts.is_address(), |
|
814 "wrong celltypestate"); |
|
815 if (localNo < 0 || localNo > _max_locals) { |
|
816 verify_error("variable write error: r%d", localNo); |
|
817 return; |
|
818 } |
|
819 vars()[localNo] = cts; |
|
820 } |
|
821 |
|
822 CellTypeState GenerateOopMap::get_var(int localNo) { |
|
823 assert(localNo < _max_locals + _nof_refval_conflicts, "variable read error") |
|
824 if (localNo < 0 || localNo > _max_locals) { |
|
825 verify_error("variable read error: r%d", localNo); |
|
826 return valCTS; // just to pick something; |
|
827 } |
|
828 return vars()[localNo]; |
|
829 } |
|
830 |
|
831 CellTypeState GenerateOopMap::pop() { |
|
832 if ( _stack_top <= 0) { |
|
833 verify_error("stack underflow"); |
|
834 return valCTS; // just to pick something |
|
835 } |
|
836 return stack()[--_stack_top]; |
|
837 } |
|
838 |
|
839 void GenerateOopMap::push(CellTypeState cts) { |
|
840 if ( _stack_top >= _max_stack) { |
|
841 verify_error("stack overflow"); |
|
842 return; |
|
843 } |
|
844 stack()[_stack_top++] = cts; |
|
845 } |
|
846 |
|
847 CellTypeState GenerateOopMap::monitor_pop() { |
|
848 assert(_monitor_top != bad_monitors, "monitor_pop called on error monitor stack"); |
|
849 if (_monitor_top == 0) { |
|
850 // We have detected a pop of an empty monitor stack. |
|
851 _monitor_safe = false; |
|
852 _monitor_top = bad_monitors; |
|
853 |
|
854 if (TraceMonitorMismatch) { |
|
855 report_monitor_mismatch("monitor stack underflow"); |
|
856 } |
|
857 return CellTypeState::ref; // just to keep the analysis going. |
|
858 } |
|
859 return monitors()[--_monitor_top]; |
|
860 } |
|
861 |
|
862 void GenerateOopMap::monitor_push(CellTypeState cts) { |
|
863 assert(_monitor_top != bad_monitors, "monitor_push called on error monitor stack"); |
|
864 if (_monitor_top >= _max_monitors) { |
|
865 // Some monitorenter is being executed more than once. |
|
866 // This means that the monitor stack cannot be simulated. |
|
867 _monitor_safe = false; |
|
868 _monitor_top = bad_monitors; |
|
869 |
|
870 if (TraceMonitorMismatch) { |
|
871 report_monitor_mismatch("monitor stack overflow"); |
|
872 } |
|
873 return; |
|
874 } |
|
875 monitors()[_monitor_top++] = cts; |
|
876 } |
|
877 |
|
878 // |
|
879 // Interpretation handling methods |
|
880 // |
|
881 |
|
882 void GenerateOopMap::do_interpretation() |
|
883 { |
|
884 // "i" is just for debugging, so we can detect cases where this loop is |
|
885 // iterated more than once. |
|
886 int i = 0; |
|
887 do { |
|
888 #ifndef PRODUCT |
|
889 if (TraceNewOopMapGeneration) { |
|
890 tty->print("\n\nIteration #%d of do_interpretation loop, method:\n", i); |
|
891 method()->print_name(tty); |
|
892 tty->print("\n\n"); |
|
893 } |
|
894 #endif |
|
895 _conflict = false; |
|
896 _monitor_safe = true; |
|
897 // init_state is now called from init_basic_blocks. The length of a |
|
898 // state vector cannot be determined until we have made a pass through |
|
899 // the bytecodes counting the possible monitor entries. |
|
900 if (!_got_error) init_basic_blocks(); |
|
901 if (!_got_error) setup_method_entry_state(); |
|
902 if (!_got_error) interp_all(); |
|
903 if (!_got_error) rewrite_refval_conflicts(); |
|
904 i++; |
|
905 } while (_conflict && !_got_error); |
|
906 } |
|
907 |
|
908 void GenerateOopMap::init_basic_blocks() { |
|
909 // Note: Could consider reserving only the needed space for each BB's state |
|
910 // (entry stack may not be of maximal height for every basic block). |
|
911 // But cumbersome since we don't know the stack heights yet. (Nor the |
|
912 // monitor stack heights...) |
|
913 |
|
914 _basic_blocks = NEW_RESOURCE_ARRAY(BasicBlock, _bb_count); |
|
915 |
|
916 // Make a pass through the bytecodes. Count the number of monitorenters. |
|
917 // This can be used an upper bound on the monitor stack depth in programs |
|
918 // which obey stack discipline with their monitor usage. Initialize the |
|
919 // known information about basic blocks. |
|
920 BytecodeStream j(_method); |
|
921 Bytecodes::Code bytecode; |
|
922 |
|
923 int bbNo = 0; |
|
924 int monitor_count = 0; |
|
925 int prev_bci = -1; |
|
926 while( (bytecode = j.next()) >= 0) { |
|
927 if (j.code() == Bytecodes::_monitorenter) { |
|
928 monitor_count++; |
|
929 } |
|
930 |
|
931 int bci = j.bci(); |
|
932 if (is_bb_header(bci)) { |
|
933 // Initialize the basicblock structure |
|
934 BasicBlock *bb = _basic_blocks + bbNo; |
|
935 bb->_bci = bci; |
|
936 bb->_max_locals = _max_locals; |
|
937 bb->_max_stack = _max_stack; |
|
938 bb->set_changed(false); |
|
939 bb->_stack_top = BasicBlock::_dead_basic_block; // Initialize all basicblocks are dead. |
|
940 bb->_monitor_top = bad_monitors; |
|
941 |
|
942 if (bbNo > 0) { |
|
943 _basic_blocks[bbNo - 1]._end_bci = prev_bci; |
|
944 } |
|
945 |
|
946 bbNo++; |
|
947 } |
|
948 // Remember prevous bci. |
|
949 prev_bci = bci; |
|
950 } |
|
951 // Set |
|
952 _basic_blocks[bbNo-1]._end_bci = prev_bci; |
|
953 |
|
954 |
|
955 _max_monitors = monitor_count; |
|
956 |
|
957 // Now that we have a bound on the depth of the monitor stack, we can |
|
958 // initialize the CellTypeState-related information. |
|
959 init_state(); |
|
960 |
|
961 // We allocate space for all state-vectors for all basicblocks in one huge chuck. |
|
962 // Then in the next part of the code, we set a pointer in each _basic_block that |
|
963 // points to each piece. |
|
964 CellTypeState *basicBlockState = NEW_RESOURCE_ARRAY(CellTypeState, bbNo * _state_len); |
|
965 memset(basicBlockState, 0, bbNo * _state_len * sizeof(CellTypeState)); |
|
966 |
|
967 // Make a pass over the basicblocks and assign their state vectors. |
|
968 for (int blockNum=0; blockNum < bbNo; blockNum++) { |
|
969 BasicBlock *bb = _basic_blocks + blockNum; |
|
970 bb->_state = basicBlockState + blockNum * _state_len; |
|
971 |
|
972 #ifdef ASSERT |
|
973 if (blockNum + 1 < bbNo) { |
|
974 address bcp = _method->bcp_from(bb->_end_bci); |
|
975 int bc_len = Bytecodes::java_length_at(bcp); |
|
976 assert(bb->_end_bci + bc_len == bb[1]._bci, "unmatched bci info in basicblock"); |
|
977 } |
|
978 #endif |
|
979 } |
|
980 #ifdef ASSERT |
|
981 { BasicBlock *bb = &_basic_blocks[bbNo-1]; |
|
982 address bcp = _method->bcp_from(bb->_end_bci); |
|
983 int bc_len = Bytecodes::java_length_at(bcp); |
|
984 assert(bb->_end_bci + bc_len == _method->code_size(), "wrong end bci"); |
|
985 } |
|
986 #endif |
|
987 |
|
988 // Check that the correct number of basicblocks was found |
|
989 if (bbNo !=_bb_count) { |
|
990 if (bbNo < _bb_count) { |
|
991 verify_error("jump into the middle of instruction?"); |
|
992 return; |
|
993 } else { |
|
994 verify_error("extra basic blocks - should not happen?"); |
|
995 return; |
|
996 } |
|
997 } |
|
998 |
|
999 // Mark all alive blocks |
|
1000 mark_reachable_code(); |
|
1001 } |
|
1002 |
|
1003 void GenerateOopMap::setup_method_entry_state() { |
|
1004 |
|
1005 // Initialize all locals to 'uninit' and set stack-height to 0 |
|
1006 make_context_uninitialized(); |
|
1007 |
|
1008 // Initialize CellState type of arguments |
|
1009 methodsig_to_effect(method()->signature(), method()->is_static(), vars()); |
|
1010 |
|
1011 // If some references must be pre-assigned to null, then set that up |
|
1012 initialize_vars(); |
|
1013 |
|
1014 // This is the start state |
|
1015 merge_state_into_bb(&_basic_blocks[0]); |
|
1016 |
|
1017 assert(_basic_blocks[0].changed(), "we are not getting off the ground"); |
|
1018 } |
|
1019 |
|
1020 // The instruction at bci is changing size by "delta". Update the basic blocks. |
|
1021 void GenerateOopMap::update_basic_blocks(int bci, int delta, |
|
1022 int new_method_size) { |
|
1023 assert(new_method_size >= method()->code_size() + delta, |
|
1024 "new method size is too small"); |
|
1025 int newWords = binsToHold(new_method_size); |
|
1026 |
|
1027 uintptr_t * new_bb_hdr_bits = NEW_RESOURCE_ARRAY(uintptr_t, newWords); |
|
1028 |
|
1029 BitMap bb_bits(new_bb_hdr_bits, new_method_size); |
|
1030 bb_bits.clear(); |
|
1031 |
|
1032 for(int k = 0; k < _bb_count; k++) { |
|
1033 if (_basic_blocks[k]._bci > bci) { |
|
1034 _basic_blocks[k]._bci += delta; |
|
1035 _basic_blocks[k]._end_bci += delta; |
|
1036 } |
|
1037 bb_bits.at_put(_basic_blocks[k]._bci, true); |
|
1038 } |
|
1039 _bb_hdr_bits = new_bb_hdr_bits ; |
|
1040 } |
|
1041 |
|
1042 // |
|
1043 // Initvars handling |
|
1044 // |
|
1045 |
|
1046 void GenerateOopMap::initialize_vars() { |
|
1047 for (int k = 0; k < _init_vars->length(); k++) |
|
1048 _state[_init_vars->at(k)] = CellTypeState::make_slot_ref(k); |
|
1049 } |
|
1050 |
|
1051 void GenerateOopMap::add_to_ref_init_set(int localNo) { |
|
1052 |
|
1053 if (TraceNewOopMapGeneration) |
|
1054 tty->print_cr("Added init vars: %d", localNo); |
|
1055 |
|
1056 // Is it already in the set? |
|
1057 if (_init_vars->contains(localNo) ) |
|
1058 return; |
|
1059 |
|
1060 _init_vars->append(localNo); |
|
1061 } |
|
1062 |
|
1063 // |
|
1064 // Interpreration code |
|
1065 // |
|
1066 |
|
1067 void GenerateOopMap::interp_all() { |
|
1068 bool change = true; |
|
1069 |
|
1070 while (change && !_got_error) { |
|
1071 change = false; |
|
1072 for (int i = 0; i < _bb_count && !_got_error; i++) { |
|
1073 BasicBlock *bb = &_basic_blocks[i]; |
|
1074 if (bb->changed()) { |
|
1075 if (_got_error) return; |
|
1076 change = true; |
|
1077 bb->set_changed(false); |
|
1078 interp_bb(bb); |
|
1079 } |
|
1080 } |
|
1081 } |
|
1082 } |
|
1083 |
|
1084 void GenerateOopMap::interp_bb(BasicBlock *bb) { |
|
1085 |
|
1086 // We do not want to do anything in case the basic-block has not been initialized. This |
|
1087 // will happen in the case where there is dead-code hang around in a method. |
|
1088 assert(bb->is_reachable(), "should be reachable or deadcode exist"); |
|
1089 restore_state(bb); |
|
1090 |
|
1091 BytecodeStream itr(_method); |
|
1092 |
|
1093 // Set iterator interval to be the current basicblock |
|
1094 int lim_bci = next_bb_start_pc(bb); |
|
1095 itr.set_interval(bb->_bci, lim_bci); |
|
1096 assert(lim_bci != bb->_bci, "must be at least one instruction in a basicblock"); |
|
1097 itr.next(); // read first instruction |
|
1098 |
|
1099 // Iterates through all bytecodes except the last in a basic block. |
|
1100 // We handle the last one special, since there is controlflow change. |
|
1101 while(itr.next_bci() < lim_bci && !_got_error) { |
|
1102 if (_has_exceptions || _monitor_top != 0) { |
|
1103 // We do not need to interpret the results of exceptional |
|
1104 // continuation from this instruction when the method has no |
|
1105 // exception handlers and the monitor stack is currently |
|
1106 // empty. |
|
1107 do_exception_edge(&itr); |
|
1108 } |
|
1109 interp1(&itr); |
|
1110 itr.next(); |
|
1111 } |
|
1112 |
|
1113 // Handle last instruction. |
|
1114 if (!_got_error) { |
|
1115 assert(itr.next_bci() == lim_bci, "must point to end"); |
|
1116 if (_has_exceptions || _monitor_top != 0) { |
|
1117 do_exception_edge(&itr); |
|
1118 } |
|
1119 interp1(&itr); |
|
1120 |
|
1121 bool fall_through = jump_targets_do(&itr, GenerateOopMap::merge_state, NULL); |
|
1122 if (_got_error) return; |
|
1123 |
|
1124 if (itr.code() == Bytecodes::_ret) { |
|
1125 assert(!fall_through, "cannot be set if ret instruction"); |
|
1126 // Automatically handles 'wide' ret indicies |
|
1127 ret_jump_targets_do(&itr, GenerateOopMap::merge_state, itr.get_index(), NULL); |
|
1128 } else if (fall_through) { |
|
1129 // Hit end of BB, but the instr. was a fall-through instruction, |
|
1130 // so perform transition as if the BB ended in a "jump". |
|
1131 if (lim_bci != bb[1]._bci) { |
|
1132 verify_error("bytecodes fell through last instruction"); |
|
1133 return; |
|
1134 } |
|
1135 merge_state_into_bb(bb + 1); |
|
1136 } |
|
1137 } |
|
1138 } |
|
1139 |
|
1140 void GenerateOopMap::do_exception_edge(BytecodeStream* itr) { |
|
1141 // Only check exception edge, if bytecode can trap |
|
1142 if (!Bytecodes::can_trap(itr->code())) return; |
|
1143 switch (itr->code()) { |
|
1144 case Bytecodes::_aload_0: |
|
1145 // These bytecodes can trap for rewriting. We need to assume that |
|
1146 // they do not throw exceptions to make the monitor analysis work. |
|
1147 return; |
|
1148 |
|
1149 case Bytecodes::_ireturn: |
|
1150 case Bytecodes::_lreturn: |
|
1151 case Bytecodes::_freturn: |
|
1152 case Bytecodes::_dreturn: |
|
1153 case Bytecodes::_areturn: |
|
1154 case Bytecodes::_return: |
|
1155 // If the monitor stack height is not zero when we leave the method, |
|
1156 // then we are either exiting with a non-empty stack or we have |
|
1157 // found monitor trouble earlier in our analysis. In either case, |
|
1158 // assume an exception could be taken here. |
|
1159 if (_monitor_top == 0) { |
|
1160 return; |
|
1161 } |
|
1162 break; |
|
1163 |
|
1164 case Bytecodes::_monitorexit: |
|
1165 // If the monitor stack height is bad_monitors, then we have detected a |
|
1166 // monitor matching problem earlier in the analysis. If the |
|
1167 // monitor stack height is 0, we are about to pop a monitor |
|
1168 // off of an empty stack. In either case, the bytecode |
|
1169 // could throw an exception. |
|
1170 if (_monitor_top != bad_monitors && _monitor_top != 0) { |
|
1171 return; |
|
1172 } |
|
1173 break; |
|
1174 } |
|
1175 |
|
1176 if (_has_exceptions) { |
|
1177 int bci = itr->bci(); |
|
1178 typeArrayOop exct = method()->exception_table(); |
|
1179 for(int i = 0; i< exct->length(); i+=4) { |
|
1180 int start_pc = exct->int_at(i); |
|
1181 int end_pc = exct->int_at(i+1); |
|
1182 int handler_pc = exct->int_at(i+2); |
|
1183 int catch_type = exct->int_at(i+3); |
|
1184 |
|
1185 if (start_pc <= bci && bci < end_pc) { |
|
1186 BasicBlock *excBB = get_basic_block_at(handler_pc); |
|
1187 CellTypeState *excStk = excBB->stack(); |
|
1188 CellTypeState *cOpStck = stack(); |
|
1189 CellTypeState cOpStck_0 = cOpStck[0]; |
|
1190 int cOpStackTop = _stack_top; |
|
1191 |
|
1192 // Exception stacks are always the same. |
|
1193 assert(method()->max_stack() > 0, "sanity check"); |
|
1194 |
|
1195 // We remembered the size and first element of "cOpStck" |
|
1196 // above; now we temporarily set them to the appropriate |
|
1197 // values for an exception handler. */ |
|
1198 cOpStck[0] = CellTypeState::make_slot_ref(_max_locals); |
|
1199 _stack_top = 1; |
|
1200 |
|
1201 merge_state_into_bb(excBB); |
|
1202 |
|
1203 // Now undo the temporary change. |
|
1204 cOpStck[0] = cOpStck_0; |
|
1205 _stack_top = cOpStackTop; |
|
1206 |
|
1207 // If this is a "catch all" handler, then we do not need to |
|
1208 // consider any additional handlers. |
|
1209 if (catch_type == 0) { |
|
1210 return; |
|
1211 } |
|
1212 } |
|
1213 } |
|
1214 } |
|
1215 |
|
1216 // It is possible that none of the exception handlers would have caught |
|
1217 // the exception. In this case, we will exit the method. We must |
|
1218 // ensure that the monitor stack is empty in this case. |
|
1219 if (_monitor_top == 0) { |
|
1220 return; |
|
1221 } |
|
1222 |
|
1223 // We pessimistically assume that this exception can escape the |
|
1224 // method. (It is possible that it will always be caught, but |
|
1225 // we don't care to analyse the types of the catch clauses.) |
|
1226 |
|
1227 // We don't set _monitor_top to bad_monitors because there are no successors |
|
1228 // to this exceptional exit. |
|
1229 |
|
1230 if (TraceMonitorMismatch && _monitor_safe) { |
|
1231 // We check _monitor_safe so that we only report the first mismatched |
|
1232 // exceptional exit. |
|
1233 report_monitor_mismatch("non-empty monitor stack at exceptional exit"); |
|
1234 } |
|
1235 _monitor_safe = false; |
|
1236 |
|
1237 } |
|
1238 |
|
1239 void GenerateOopMap::report_monitor_mismatch(const char *msg) { |
|
1240 #ifndef PRODUCT |
|
1241 tty->print(" Monitor mismatch in method "); |
|
1242 method()->print_short_name(tty); |
|
1243 tty->print_cr(": %s", msg); |
|
1244 #endif |
|
1245 } |
|
1246 |
|
1247 void GenerateOopMap::print_states(outputStream *os, |
|
1248 CellTypeState* vec, int num) { |
|
1249 for (int i = 0; i < num; i++) { |
|
1250 vec[i].print(tty); |
|
1251 } |
|
1252 } |
|
1253 |
|
1254 // Print the state values at the current bytecode. |
|
1255 void GenerateOopMap::print_current_state(outputStream *os, |
|
1256 BytecodeStream *currentBC, |
|
1257 bool detailed) { |
|
1258 |
|
1259 if (detailed) { |
|
1260 os->print(" %4d vars = ", currentBC->bci()); |
|
1261 print_states(os, vars(), _max_locals); |
|
1262 os->print(" %s", Bytecodes::name(currentBC->code())); |
|
1263 switch(currentBC->code()) { |
|
1264 case Bytecodes::_invokevirtual: |
|
1265 case Bytecodes::_invokespecial: |
|
1266 case Bytecodes::_invokestatic: |
|
1267 case Bytecodes::_invokeinterface: |
|
1268 int idx = currentBC->get_index_big(); |
|
1269 constantPoolOop cp = method()->constants(); |
|
1270 int nameAndTypeIdx = cp->name_and_type_ref_index_at(idx); |
|
1271 int signatureIdx = cp->signature_ref_index_at(nameAndTypeIdx); |
|
1272 symbolOop signature = cp->symbol_at(signatureIdx); |
|
1273 os->print("%s", signature->as_C_string()); |
|
1274 } |
|
1275 os->cr(); |
|
1276 os->print(" stack = "); |
|
1277 print_states(os, stack(), _stack_top); |
|
1278 os->cr(); |
|
1279 if (_monitor_top != bad_monitors) { |
|
1280 os->print(" monitors = "); |
|
1281 print_states(os, monitors(), _monitor_top); |
|
1282 } else { |
|
1283 os->print(" [bad monitor stack]"); |
|
1284 } |
|
1285 os->cr(); |
|
1286 } else { |
|
1287 os->print(" %4d vars = '%s' ", currentBC->bci(), state_vec_to_string(vars(), _max_locals)); |
|
1288 os->print(" stack = '%s' ", state_vec_to_string(stack(), _stack_top)); |
|
1289 if (_monitor_top != bad_monitors) { |
|
1290 os->print(" monitors = '%s' \t%s", state_vec_to_string(monitors(), _monitor_top), Bytecodes::name(currentBC->code())); |
|
1291 } else { |
|
1292 os->print(" [bad monitor stack]"); |
|
1293 } |
|
1294 switch(currentBC->code()) { |
|
1295 case Bytecodes::_invokevirtual: |
|
1296 case Bytecodes::_invokespecial: |
|
1297 case Bytecodes::_invokestatic: |
|
1298 case Bytecodes::_invokeinterface: |
|
1299 int idx = currentBC->get_index_big(); |
|
1300 constantPoolOop cp = method()->constants(); |
|
1301 int nameAndTypeIdx = cp->name_and_type_ref_index_at(idx); |
|
1302 int signatureIdx = cp->signature_ref_index_at(nameAndTypeIdx); |
|
1303 symbolOop signature = cp->symbol_at(signatureIdx); |
|
1304 os->print("%s", signature->as_C_string()); |
|
1305 } |
|
1306 os->cr(); |
|
1307 } |
|
1308 } |
|
1309 |
|
1310 // Sets the current state to be the state after executing the |
|
1311 // current instruction, starting in the current state. |
|
1312 void GenerateOopMap::interp1(BytecodeStream *itr) { |
|
1313 if (TraceNewOopMapGeneration) { |
|
1314 print_current_state(tty, itr, TraceNewOopMapGenerationDetailed); |
|
1315 } |
|
1316 |
|
1317 // Should we report the results? Result is reported *before* the instruction at the current bci is executed. |
|
1318 // However, not for calls. For calls we do not want to include the arguments, so we postpone the reporting until |
|
1319 // they have been popped (in method ppl). |
|
1320 if (_report_result == true) { |
|
1321 switch(itr->code()) { |
|
1322 case Bytecodes::_invokevirtual: |
|
1323 case Bytecodes::_invokespecial: |
|
1324 case Bytecodes::_invokestatic: |
|
1325 case Bytecodes::_invokeinterface: |
|
1326 _itr_send = itr; |
|
1327 _report_result_for_send = true; |
|
1328 break; |
|
1329 default: |
|
1330 fill_stackmap_for_opcodes(itr, vars(), stack(), _stack_top); |
|
1331 break; |
|
1332 } |
|
1333 } |
|
1334 |
|
1335 // abstract interpretation of current opcode |
|
1336 switch(itr->code()) { |
|
1337 case Bytecodes::_nop: break; |
|
1338 case Bytecodes::_goto: break; |
|
1339 case Bytecodes::_goto_w: break; |
|
1340 case Bytecodes::_iinc: break; |
|
1341 case Bytecodes::_return: do_return_monitor_check(); |
|
1342 break; |
|
1343 |
|
1344 case Bytecodes::_aconst_null: |
|
1345 case Bytecodes::_new: ppush1(CellTypeState::make_line_ref(itr->bci())); |
|
1346 break; |
|
1347 |
|
1348 case Bytecodes::_iconst_m1: |
|
1349 case Bytecodes::_iconst_0: |
|
1350 case Bytecodes::_iconst_1: |
|
1351 case Bytecodes::_iconst_2: |
|
1352 case Bytecodes::_iconst_3: |
|
1353 case Bytecodes::_iconst_4: |
|
1354 case Bytecodes::_iconst_5: |
|
1355 case Bytecodes::_fconst_0: |
|
1356 case Bytecodes::_fconst_1: |
|
1357 case Bytecodes::_fconst_2: |
|
1358 case Bytecodes::_bipush: |
|
1359 case Bytecodes::_sipush: ppush1(valCTS); break; |
|
1360 |
|
1361 case Bytecodes::_lconst_0: |
|
1362 case Bytecodes::_lconst_1: |
|
1363 case Bytecodes::_dconst_0: |
|
1364 case Bytecodes::_dconst_1: ppush(vvCTS); break; |
|
1365 |
|
1366 case Bytecodes::_ldc2_w: ppush(vvCTS); break; |
|
1367 |
|
1368 case Bytecodes::_ldc: do_ldc(itr->get_index(), itr->bci()); break; |
|
1369 case Bytecodes::_ldc_w: do_ldc(itr->get_index_big(), itr->bci());break; |
|
1370 |
|
1371 case Bytecodes::_iload: |
|
1372 case Bytecodes::_fload: ppload(vCTS, itr->get_index()); break; |
|
1373 |
|
1374 case Bytecodes::_lload: |
|
1375 case Bytecodes::_dload: ppload(vvCTS,itr->get_index()); break; |
|
1376 |
|
1377 case Bytecodes::_aload: ppload(rCTS, itr->get_index()); break; |
|
1378 |
|
1379 case Bytecodes::_iload_0: |
|
1380 case Bytecodes::_fload_0: ppload(vCTS, 0); break; |
|
1381 case Bytecodes::_iload_1: |
|
1382 case Bytecodes::_fload_1: ppload(vCTS, 1); break; |
|
1383 case Bytecodes::_iload_2: |
|
1384 case Bytecodes::_fload_2: ppload(vCTS, 2); break; |
|
1385 case Bytecodes::_iload_3: |
|
1386 case Bytecodes::_fload_3: ppload(vCTS, 3); break; |
|
1387 |
|
1388 case Bytecodes::_lload_0: |
|
1389 case Bytecodes::_dload_0: ppload(vvCTS, 0); break; |
|
1390 case Bytecodes::_lload_1: |
|
1391 case Bytecodes::_dload_1: ppload(vvCTS, 1); break; |
|
1392 case Bytecodes::_lload_2: |
|
1393 case Bytecodes::_dload_2: ppload(vvCTS, 2); break; |
|
1394 case Bytecodes::_lload_3: |
|
1395 case Bytecodes::_dload_3: ppload(vvCTS, 3); break; |
|
1396 |
|
1397 case Bytecodes::_aload_0: ppload(rCTS, 0); break; |
|
1398 case Bytecodes::_aload_1: ppload(rCTS, 1); break; |
|
1399 case Bytecodes::_aload_2: ppload(rCTS, 2); break; |
|
1400 case Bytecodes::_aload_3: ppload(rCTS, 3); break; |
|
1401 |
|
1402 case Bytecodes::_iaload: |
|
1403 case Bytecodes::_faload: |
|
1404 case Bytecodes::_baload: |
|
1405 case Bytecodes::_caload: |
|
1406 case Bytecodes::_saload: pp(vrCTS, vCTS); break; |
|
1407 |
|
1408 case Bytecodes::_laload: pp(vrCTS, vvCTS); break; |
|
1409 case Bytecodes::_daload: pp(vrCTS, vvCTS); break; |
|
1410 |
|
1411 case Bytecodes::_aaload: pp_new_ref(vrCTS, itr->bci()); break; |
|
1412 |
|
1413 case Bytecodes::_istore: |
|
1414 case Bytecodes::_fstore: ppstore(vCTS, itr->get_index()); break; |
|
1415 |
|
1416 case Bytecodes::_lstore: |
|
1417 case Bytecodes::_dstore: ppstore(vvCTS, itr->get_index()); break; |
|
1418 |
|
1419 case Bytecodes::_astore: do_astore(itr->get_index()); break; |
|
1420 |
|
1421 case Bytecodes::_istore_0: |
|
1422 case Bytecodes::_fstore_0: ppstore(vCTS, 0); break; |
|
1423 case Bytecodes::_istore_1: |
|
1424 case Bytecodes::_fstore_1: ppstore(vCTS, 1); break; |
|
1425 case Bytecodes::_istore_2: |
|
1426 case Bytecodes::_fstore_2: ppstore(vCTS, 2); break; |
|
1427 case Bytecodes::_istore_3: |
|
1428 case Bytecodes::_fstore_3: ppstore(vCTS, 3); break; |
|
1429 |
|
1430 case Bytecodes::_lstore_0: |
|
1431 case Bytecodes::_dstore_0: ppstore(vvCTS, 0); break; |
|
1432 case Bytecodes::_lstore_1: |
|
1433 case Bytecodes::_dstore_1: ppstore(vvCTS, 1); break; |
|
1434 case Bytecodes::_lstore_2: |
|
1435 case Bytecodes::_dstore_2: ppstore(vvCTS, 2); break; |
|
1436 case Bytecodes::_lstore_3: |
|
1437 case Bytecodes::_dstore_3: ppstore(vvCTS, 3); break; |
|
1438 |
|
1439 case Bytecodes::_astore_0: do_astore(0); break; |
|
1440 case Bytecodes::_astore_1: do_astore(1); break; |
|
1441 case Bytecodes::_astore_2: do_astore(2); break; |
|
1442 case Bytecodes::_astore_3: do_astore(3); break; |
|
1443 |
|
1444 case Bytecodes::_iastore: |
|
1445 case Bytecodes::_fastore: |
|
1446 case Bytecodes::_bastore: |
|
1447 case Bytecodes::_castore: |
|
1448 case Bytecodes::_sastore: ppop(vvrCTS); break; |
|
1449 case Bytecodes::_lastore: |
|
1450 case Bytecodes::_dastore: ppop(vvvrCTS); break; |
|
1451 case Bytecodes::_aastore: ppop(rvrCTS); break; |
|
1452 |
|
1453 case Bytecodes::_pop: ppop_any(1); break; |
|
1454 case Bytecodes::_pop2: ppop_any(2); break; |
|
1455 |
|
1456 case Bytecodes::_dup: ppdupswap(1, "11"); break; |
|
1457 case Bytecodes::_dup_x1: ppdupswap(2, "121"); break; |
|
1458 case Bytecodes::_dup_x2: ppdupswap(3, "1321"); break; |
|
1459 case Bytecodes::_dup2: ppdupswap(2, "2121"); break; |
|
1460 case Bytecodes::_dup2_x1: ppdupswap(3, "21321"); break; |
|
1461 case Bytecodes::_dup2_x2: ppdupswap(4, "214321"); break; |
|
1462 case Bytecodes::_swap: ppdupswap(2, "12"); break; |
|
1463 |
|
1464 case Bytecodes::_iadd: |
|
1465 case Bytecodes::_fadd: |
|
1466 case Bytecodes::_isub: |
|
1467 case Bytecodes::_fsub: |
|
1468 case Bytecodes::_imul: |
|
1469 case Bytecodes::_fmul: |
|
1470 case Bytecodes::_idiv: |
|
1471 case Bytecodes::_fdiv: |
|
1472 case Bytecodes::_irem: |
|
1473 case Bytecodes::_frem: |
|
1474 case Bytecodes::_ishl: |
|
1475 case Bytecodes::_ishr: |
|
1476 case Bytecodes::_iushr: |
|
1477 case Bytecodes::_iand: |
|
1478 case Bytecodes::_ior: |
|
1479 case Bytecodes::_ixor: |
|
1480 case Bytecodes::_l2f: |
|
1481 case Bytecodes::_l2i: |
|
1482 case Bytecodes::_d2f: |
|
1483 case Bytecodes::_d2i: |
|
1484 case Bytecodes::_fcmpl: |
|
1485 case Bytecodes::_fcmpg: pp(vvCTS, vCTS); break; |
|
1486 |
|
1487 case Bytecodes::_ladd: |
|
1488 case Bytecodes::_dadd: |
|
1489 case Bytecodes::_lsub: |
|
1490 case Bytecodes::_dsub: |
|
1491 case Bytecodes::_lmul: |
|
1492 case Bytecodes::_dmul: |
|
1493 case Bytecodes::_ldiv: |
|
1494 case Bytecodes::_ddiv: |
|
1495 case Bytecodes::_lrem: |
|
1496 case Bytecodes::_drem: |
|
1497 case Bytecodes::_land: |
|
1498 case Bytecodes::_lor: |
|
1499 case Bytecodes::_lxor: pp(vvvvCTS, vvCTS); break; |
|
1500 |
|
1501 case Bytecodes::_ineg: |
|
1502 case Bytecodes::_fneg: |
|
1503 case Bytecodes::_i2f: |
|
1504 case Bytecodes::_f2i: |
|
1505 case Bytecodes::_i2c: |
|
1506 case Bytecodes::_i2s: |
|
1507 case Bytecodes::_i2b: pp(vCTS, vCTS); break; |
|
1508 |
|
1509 case Bytecodes::_lneg: |
|
1510 case Bytecodes::_dneg: |
|
1511 case Bytecodes::_l2d: |
|
1512 case Bytecodes::_d2l: pp(vvCTS, vvCTS); break; |
|
1513 |
|
1514 case Bytecodes::_lshl: |
|
1515 case Bytecodes::_lshr: |
|
1516 case Bytecodes::_lushr: pp(vvvCTS, vvCTS); break; |
|
1517 |
|
1518 case Bytecodes::_i2l: |
|
1519 case Bytecodes::_i2d: |
|
1520 case Bytecodes::_f2l: |
|
1521 case Bytecodes::_f2d: pp(vCTS, vvCTS); break; |
|
1522 |
|
1523 case Bytecodes::_lcmp: pp(vvvvCTS, vCTS); break; |
|
1524 case Bytecodes::_dcmpl: |
|
1525 case Bytecodes::_dcmpg: pp(vvvvCTS, vCTS); break; |
|
1526 |
|
1527 case Bytecodes::_ifeq: |
|
1528 case Bytecodes::_ifne: |
|
1529 case Bytecodes::_iflt: |
|
1530 case Bytecodes::_ifge: |
|
1531 case Bytecodes::_ifgt: |
|
1532 case Bytecodes::_ifle: |
|
1533 case Bytecodes::_tableswitch: ppop1(valCTS); |
|
1534 break; |
|
1535 case Bytecodes::_ireturn: |
|
1536 case Bytecodes::_freturn: do_return_monitor_check(); |
|
1537 ppop1(valCTS); |
|
1538 break; |
|
1539 case Bytecodes::_if_icmpeq: |
|
1540 case Bytecodes::_if_icmpne: |
|
1541 case Bytecodes::_if_icmplt: |
|
1542 case Bytecodes::_if_icmpge: |
|
1543 case Bytecodes::_if_icmpgt: |
|
1544 case Bytecodes::_if_icmple: ppop(vvCTS); |
|
1545 break; |
|
1546 |
|
1547 case Bytecodes::_lreturn: do_return_monitor_check(); |
|
1548 ppop(vvCTS); |
|
1549 break; |
|
1550 |
|
1551 case Bytecodes::_dreturn: do_return_monitor_check(); |
|
1552 ppop(vvCTS); |
|
1553 break; |
|
1554 |
|
1555 case Bytecodes::_if_acmpeq: |
|
1556 case Bytecodes::_if_acmpne: ppop(rrCTS); break; |
|
1557 |
|
1558 case Bytecodes::_jsr: do_jsr(itr->dest()); break; |
|
1559 case Bytecodes::_jsr_w: do_jsr(itr->dest_w()); break; |
|
1560 |
|
1561 case Bytecodes::_getstatic: do_field(true, true, |
|
1562 itr->get_index_big(), |
|
1563 itr->bci()); break; |
|
1564 case Bytecodes::_putstatic: do_field(false, true, itr->get_index_big(), itr->bci()); break; |
|
1565 case Bytecodes::_getfield: do_field(true, false, itr->get_index_big(), itr->bci()); break; |
|
1566 case Bytecodes::_putfield: do_field(false, false, itr->get_index_big(), itr->bci()); break; |
|
1567 |
|
1568 case Bytecodes::_invokevirtual: |
|
1569 case Bytecodes::_invokespecial: do_method(false, false, itr->get_index_big(), itr->bci()); break; |
|
1570 case Bytecodes::_invokestatic: do_method(true, false, itr->get_index_big(), itr->bci()); break; |
|
1571 case Bytecodes::_invokeinterface: do_method(false, true, itr->get_index_big(), itr->bci()); break; |
|
1572 case Bytecodes::_newarray: |
|
1573 case Bytecodes::_anewarray: pp_new_ref(vCTS, itr->bci()); break; |
|
1574 case Bytecodes::_checkcast: do_checkcast(); break; |
|
1575 case Bytecodes::_arraylength: |
|
1576 case Bytecodes::_instanceof: pp(rCTS, vCTS); break; |
|
1577 case Bytecodes::_monitorenter: do_monitorenter(itr->bci()); break; |
|
1578 case Bytecodes::_monitorexit: do_monitorexit(itr->bci()); break; |
|
1579 |
|
1580 case Bytecodes::_athrow: // handled by do_exception_edge() BUT ... |
|
1581 // vlh(apple): do_exception_edge() does not get |
|
1582 // called if method has no exception handlers |
|
1583 if ((!_has_exceptions) && (_monitor_top > 0)) { |
|
1584 _monitor_safe = false; |
|
1585 } |
|
1586 break; |
|
1587 |
|
1588 case Bytecodes::_areturn: do_return_monitor_check(); |
|
1589 ppop1(refCTS); |
|
1590 break; |
|
1591 case Bytecodes::_ifnull: |
|
1592 case Bytecodes::_ifnonnull: ppop1(refCTS); break; |
|
1593 case Bytecodes::_multianewarray: do_multianewarray(*(itr->bcp()+3), itr->bci()); break; |
|
1594 |
|
1595 case Bytecodes::_wide: fatal("Iterator should skip this bytecode"); break; |
|
1596 case Bytecodes::_ret: break; |
|
1597 |
|
1598 // Java opcodes |
|
1599 case Bytecodes::_lookupswitch: ppop1(valCTS); break; |
|
1600 |
|
1601 default: |
|
1602 tty->print("unexpected opcode: %d\n", itr->code()); |
|
1603 ShouldNotReachHere(); |
|
1604 break; |
|
1605 } |
|
1606 } |
|
1607 |
|
1608 void GenerateOopMap::check_type(CellTypeState expected, CellTypeState actual) { |
|
1609 if (!expected.equal_kind(actual)) { |
|
1610 verify_error("wrong type on stack (found: %c expected: %c)", actual.to_char(), expected.to_char()); |
|
1611 } |
|
1612 } |
|
1613 |
|
1614 void GenerateOopMap::ppstore(CellTypeState *in, int loc_no) { |
|
1615 while(!(*in).is_bottom()) { |
|
1616 CellTypeState expected =*in++; |
|
1617 CellTypeState actual = pop(); |
|
1618 check_type(expected, actual); |
|
1619 assert(loc_no >= 0, "sanity check"); |
|
1620 set_var(loc_no++, actual); |
|
1621 } |
|
1622 } |
|
1623 |
|
1624 void GenerateOopMap::ppload(CellTypeState *out, int loc_no) { |
|
1625 while(!(*out).is_bottom()) { |
|
1626 CellTypeState out1 = *out++; |
|
1627 CellTypeState vcts = get_var(loc_no); |
|
1628 assert(out1.can_be_reference() || out1.can_be_value(), |
|
1629 "can only load refs. and values."); |
|
1630 if (out1.is_reference()) { |
|
1631 assert(loc_no>=0, "sanity check"); |
|
1632 if (!vcts.is_reference()) { |
|
1633 // We were asked to push a reference, but the type of the |
|
1634 // variable can be something else |
|
1635 _conflict = true; |
|
1636 if (vcts.can_be_uninit()) { |
|
1637 // It is a ref-uninit conflict (at least). If there are other |
|
1638 // problems, we'll get them in the next round |
|
1639 add_to_ref_init_set(loc_no); |
|
1640 vcts = out1; |
|
1641 } else { |
|
1642 // It wasn't a ref-uninit conflict. So must be a |
|
1643 // ref-val or ref-pc conflict. Split the variable. |
|
1644 record_refval_conflict(loc_no); |
|
1645 vcts = out1; |
|
1646 } |
|
1647 push(out1); // recover... |
|
1648 } else { |
|
1649 push(vcts); // preserve reference. |
|
1650 } |
|
1651 // Otherwise it is a conflict, but one that verification would |
|
1652 // have caught if illegal. In particular, it can't be a topCTS |
|
1653 // resulting from mergeing two difference pcCTS's since the verifier |
|
1654 // would have rejected any use of such a merge. |
|
1655 } else { |
|
1656 push(out1); // handle val/init conflict |
|
1657 } |
|
1658 loc_no++; |
|
1659 } |
|
1660 } |
|
1661 |
|
1662 void GenerateOopMap::ppdupswap(int poplen, const char *out) { |
|
1663 CellTypeState actual[5]; |
|
1664 assert(poplen < 5, "this must be less than length of actual vector"); |
|
1665 |
|
1666 // pop all arguments |
|
1667 for(int i = 0; i < poplen; i++) actual[i] = pop(); |
|
1668 |
|
1669 // put them back |
|
1670 char push_ch = *out++; |
|
1671 while (push_ch != '\0') { |
|
1672 int idx = push_ch - '1'; |
|
1673 assert(idx >= 0 && idx < poplen, "wrong arguments"); |
|
1674 push(actual[idx]); |
|
1675 push_ch = *out++; |
|
1676 } |
|
1677 } |
|
1678 |
|
1679 void GenerateOopMap::ppop1(CellTypeState out) { |
|
1680 CellTypeState actual = pop(); |
|
1681 check_type(out, actual); |
|
1682 } |
|
1683 |
|
1684 void GenerateOopMap::ppop(CellTypeState *out) { |
|
1685 while (!(*out).is_bottom()) { |
|
1686 ppop1(*out++); |
|
1687 } |
|
1688 } |
|
1689 |
|
1690 void GenerateOopMap::ppush1(CellTypeState in) { |
|
1691 assert(in.is_reference() | in.is_value(), "sanity check"); |
|
1692 push(in); |
|
1693 } |
|
1694 |
|
1695 void GenerateOopMap::ppush(CellTypeState *in) { |
|
1696 while (!(*in).is_bottom()) { |
|
1697 ppush1(*in++); |
|
1698 } |
|
1699 } |
|
1700 |
|
1701 void GenerateOopMap::pp(CellTypeState *in, CellTypeState *out) { |
|
1702 ppop(in); |
|
1703 ppush(out); |
|
1704 } |
|
1705 |
|
1706 void GenerateOopMap::pp_new_ref(CellTypeState *in, int bci) { |
|
1707 ppop(in); |
|
1708 ppush1(CellTypeState::make_line_ref(bci)); |
|
1709 } |
|
1710 |
|
1711 void GenerateOopMap::ppop_any(int poplen) { |
|
1712 if (_stack_top >= poplen) { |
|
1713 _stack_top -= poplen; |
|
1714 } else { |
|
1715 verify_error("stack underflow"); |
|
1716 } |
|
1717 } |
|
1718 |
|
1719 // Replace all occurences of the state 'match' with the state 'replace' |
|
1720 // in our current state vector. |
|
1721 void GenerateOopMap::replace_all_CTS_matches(CellTypeState match, |
|
1722 CellTypeState replace) { |
|
1723 int i; |
|
1724 int len = _max_locals + _stack_top; |
|
1725 bool change = false; |
|
1726 |
|
1727 for (i = len - 1; i >= 0; i--) { |
|
1728 if (match.equal(_state[i])) { |
|
1729 _state[i] = replace; |
|
1730 } |
|
1731 } |
|
1732 |
|
1733 if (_monitor_top > 0) { |
|
1734 int base = _max_locals + _max_stack; |
|
1735 len = base + _monitor_top; |
|
1736 for (i = len - 1; i >= base; i--) { |
|
1737 if (match.equal(_state[i])) { |
|
1738 _state[i] = replace; |
|
1739 } |
|
1740 } |
|
1741 } |
|
1742 } |
|
1743 |
|
1744 void GenerateOopMap::do_checkcast() { |
|
1745 CellTypeState actual = pop(); |
|
1746 check_type(refCTS, actual); |
|
1747 push(actual); |
|
1748 } |
|
1749 |
|
1750 void GenerateOopMap::do_monitorenter(int bci) { |
|
1751 CellTypeState actual = pop(); |
|
1752 if (_monitor_top == bad_monitors) { |
|
1753 return; |
|
1754 } |
|
1755 |
|
1756 // Bail out when we get repeated locks on an identical monitor. This case |
|
1757 // isn't too hard to handle and can be made to work if supporting nested |
|
1758 // redundant synchronized statements becomes a priority. |
|
1759 // |
|
1760 // See also "Note" in do_monitorexit(), below. |
|
1761 if (actual.is_lock_reference()) { |
|
1762 _monitor_top = bad_monitors; |
|
1763 _monitor_safe = false; |
|
1764 |
|
1765 if (TraceMonitorMismatch) { |
|
1766 report_monitor_mismatch("nested redundant lock -- bailout..."); |
|
1767 } |
|
1768 return; |
|
1769 } |
|
1770 |
|
1771 CellTypeState lock = CellTypeState::make_lock_ref(bci); |
|
1772 check_type(refCTS, actual); |
|
1773 if (!actual.is_info_top()) { |
|
1774 replace_all_CTS_matches(actual, lock); |
|
1775 monitor_push(lock); |
|
1776 } |
|
1777 } |
|
1778 |
|
1779 void GenerateOopMap::do_monitorexit(int bci) { |
|
1780 CellTypeState actual = pop(); |
|
1781 if (_monitor_top == bad_monitors) { |
|
1782 return; |
|
1783 } |
|
1784 check_type(refCTS, actual); |
|
1785 CellTypeState expected = monitor_pop(); |
|
1786 if (!actual.is_lock_reference() || !expected.equal(actual)) { |
|
1787 // The monitor we are exiting is not verifiably the one |
|
1788 // on the top of our monitor stack. This causes a monitor |
|
1789 // mismatch. |
|
1790 _monitor_top = bad_monitors; |
|
1791 _monitor_safe = false; |
|
1792 |
|
1793 // We need to mark this basic block as changed so that |
|
1794 // this monitorexit will be visited again. We need to |
|
1795 // do this to ensure that we have accounted for the |
|
1796 // possibility that this bytecode will throw an |
|
1797 // exception. |
|
1798 BasicBlock* bb = get_basic_block_containing(bci); |
|
1799 bb->set_changed(true); |
|
1800 bb->_monitor_top = bad_monitors; |
|
1801 |
|
1802 if (TraceMonitorMismatch) { |
|
1803 report_monitor_mismatch("improper monitor pair"); |
|
1804 } |
|
1805 } else { |
|
1806 // This code is a fix for the case where we have repeated |
|
1807 // locking of the same object in straightline code. We clear |
|
1808 // out the lock when it is popped from the monitor stack |
|
1809 // and replace it with an unobtrusive reference value that can |
|
1810 // be locked again. |
|
1811 // |
|
1812 // Note: when generateOopMap is fixed to properly handle repeated, |
|
1813 // nested, redundant locks on the same object, then this |
|
1814 // fix will need to be removed at that time. |
|
1815 replace_all_CTS_matches(actual, CellTypeState::make_line_ref(bci)); |
|
1816 } |
|
1817 } |
|
1818 |
|
1819 void GenerateOopMap::do_return_monitor_check() { |
|
1820 if (_monitor_top > 0) { |
|
1821 // The monitor stack must be empty when we leave the method |
|
1822 // for the monitors to be properly matched. |
|
1823 _monitor_safe = false; |
|
1824 |
|
1825 // Since there are no successors to the *return bytecode, it |
|
1826 // isn't necessary to set _monitor_top to bad_monitors. |
|
1827 |
|
1828 if (TraceMonitorMismatch) { |
|
1829 report_monitor_mismatch("non-empty monitor stack at return"); |
|
1830 } |
|
1831 } |
|
1832 } |
|
1833 |
|
1834 void GenerateOopMap::do_jsr(int targ_bci) { |
|
1835 push(CellTypeState::make_addr(targ_bci)); |
|
1836 } |
|
1837 |
|
1838 |
|
1839 |
|
1840 void GenerateOopMap::do_ldc(int idx, int bci) { |
|
1841 constantPoolOop cp = method()->constants(); |
|
1842 constantTag tag = cp->tag_at(idx); |
|
1843 |
|
1844 CellTypeState cts = (tag.is_string() || tag.is_unresolved_string() || |
|
1845 tag.is_klass() || tag.is_unresolved_klass()) |
|
1846 ? CellTypeState::make_line_ref(bci) : valCTS; |
|
1847 ppush1(cts); |
|
1848 } |
|
1849 |
|
1850 void GenerateOopMap::do_multianewarray(int dims, int bci) { |
|
1851 assert(dims >= 1, "sanity check"); |
|
1852 for(int i = dims -1; i >=0; i--) { |
|
1853 ppop1(valCTS); |
|
1854 } |
|
1855 ppush1(CellTypeState::make_line_ref(bci)); |
|
1856 } |
|
1857 |
|
1858 void GenerateOopMap::do_astore(int idx) { |
|
1859 CellTypeState r_or_p = pop(); |
|
1860 if (!r_or_p.is_address() && !r_or_p.is_reference()) { |
|
1861 // We actually expected ref or pc, but we only report that we expected a ref. It does not |
|
1862 // really matter (at least for now) |
|
1863 verify_error("wrong type on stack (found: %c, expected: {pr})", r_or_p.to_char()); |
|
1864 return; |
|
1865 } |
|
1866 set_var(idx, r_or_p); |
|
1867 } |
|
1868 |
|
1869 // Copies bottom/zero terminated CTS string from "src" into "dst". |
|
1870 // Does NOT terminate with a bottom. Returns the number of cells copied. |
|
1871 int GenerateOopMap::copy_cts(CellTypeState *dst, CellTypeState *src) { |
|
1872 int idx = 0; |
|
1873 while (!src[idx].is_bottom()) { |
|
1874 dst[idx] = src[idx]; |
|
1875 idx++; |
|
1876 } |
|
1877 return idx; |
|
1878 } |
|
1879 |
|
1880 void GenerateOopMap::do_field(int is_get, int is_static, int idx, int bci) { |
|
1881 // Dig up signature for field in constant pool |
|
1882 constantPoolOop cp = method()->constants(); |
|
1883 int nameAndTypeIdx = cp->name_and_type_ref_index_at(idx); |
|
1884 int signatureIdx = cp->signature_ref_index_at(nameAndTypeIdx); |
|
1885 symbolOop signature = cp->symbol_at(signatureIdx); |
|
1886 |
|
1887 // Parse signature (espcially simple for fields) |
|
1888 assert(signature->utf8_length() > 0, "field signatures cannot have zero length"); |
|
1889 // The signature is UFT8 encoded, but the first char is always ASCII for signatures. |
|
1890 char sigch = (char)*(signature->base()); |
|
1891 CellTypeState temp[4]; |
|
1892 CellTypeState *eff = sigchar_to_effect(sigch, bci, temp); |
|
1893 |
|
1894 CellTypeState in[4]; |
|
1895 CellTypeState *out; |
|
1896 int i = 0; |
|
1897 |
|
1898 if (is_get) { |
|
1899 out = eff; |
|
1900 } else { |
|
1901 out = epsilonCTS; |
|
1902 i = copy_cts(in, eff); |
|
1903 } |
|
1904 if (!is_static) in[i++] = CellTypeState::ref; |
|
1905 in[i] = CellTypeState::bottom; |
|
1906 assert(i<=3, "sanity check"); |
|
1907 pp(in, out); |
|
1908 } |
|
1909 |
|
1910 void GenerateOopMap::do_method(int is_static, int is_interface, int idx, int bci) { |
|
1911 // Dig up signature for field in constant pool |
|
1912 constantPoolOop cp = _method->constants(); |
|
1913 int nameAndTypeIdx = cp->name_and_type_ref_index_at(idx); |
|
1914 int signatureIdx = cp->signature_ref_index_at(nameAndTypeIdx); |
|
1915 symbolOop signature = cp->symbol_at(signatureIdx); |
|
1916 |
|
1917 // Parse method signature |
|
1918 CellTypeState out[4]; |
|
1919 CellTypeState in[MAXARGSIZE+1]; // Includes result |
|
1920 ComputeCallStack cse(signature); |
|
1921 |
|
1922 // Compute return type |
|
1923 int res_length= cse.compute_for_returntype(out); |
|
1924 |
|
1925 // Temporary hack. |
|
1926 if (out[0].equal(CellTypeState::ref) && out[1].equal(CellTypeState::bottom)) { |
|
1927 out[0] = CellTypeState::make_line_ref(bci); |
|
1928 } |
|
1929 |
|
1930 assert(res_length<=4, "max value should be vv"); |
|
1931 |
|
1932 // Compute arguments |
|
1933 int arg_length = cse.compute_for_parameters(is_static != 0, in); |
|
1934 assert(arg_length<=MAXARGSIZE, "too many locals"); |
|
1935 |
|
1936 // Pop arguments |
|
1937 for (int i = arg_length - 1; i >= 0; i--) ppop1(in[i]);// Do args in reverse order. |
|
1938 |
|
1939 // Report results |
|
1940 if (_report_result_for_send == true) { |
|
1941 fill_stackmap_for_opcodes(_itr_send, vars(), stack(), _stack_top); |
|
1942 _report_result_for_send = false; |
|
1943 } |
|
1944 |
|
1945 // Push return address |
|
1946 ppush(out); |
|
1947 } |
|
1948 |
|
1949 // This is used to parse the signature for fields, since they are very simple... |
|
1950 CellTypeState *GenerateOopMap::sigchar_to_effect(char sigch, int bci, CellTypeState *out) { |
|
1951 // Object and array |
|
1952 if (sigch=='L' || sigch=='[') { |
|
1953 out[0] = CellTypeState::make_line_ref(bci); |
|
1954 out[1] = CellTypeState::bottom; |
|
1955 return out; |
|
1956 } |
|
1957 if (sigch == 'J' || sigch == 'D' ) return vvCTS; // Long and Double |
|
1958 if (sigch == 'V' ) return epsilonCTS; // Void |
|
1959 return vCTS; // Otherwise |
|
1960 } |
|
1961 |
|
1962 long GenerateOopMap::_total_byte_count = 0; |
|
1963 elapsedTimer GenerateOopMap::_total_oopmap_time; |
|
1964 |
|
1965 // This function assumes "bcs" is at a "ret" instruction and that the vars |
|
1966 // state is valid for that instruction. Furthermore, the ret instruction |
|
1967 // must be the last instruction in "bb" (we store information about the |
|
1968 // "ret" in "bb"). |
|
1969 void GenerateOopMap::ret_jump_targets_do(BytecodeStream *bcs, jmpFct_t jmpFct, int varNo, int *data) { |
|
1970 CellTypeState ra = vars()[varNo]; |
|
1971 if (!ra.is_good_address()) { |
|
1972 verify_error("ret returns from two jsr subroutines?"); |
|
1973 return; |
|
1974 } |
|
1975 int target = ra.get_info(); |
|
1976 |
|
1977 RetTableEntry* rtEnt = _rt.find_jsrs_for_target(target); |
|
1978 int bci = bcs->bci(); |
|
1979 for (int i = 0; i < rtEnt->nof_jsrs(); i++) { |
|
1980 int target_bci = rtEnt->jsrs(i); |
|
1981 // Make sure a jrtRet does not set the changed bit for dead basicblock. |
|
1982 BasicBlock* jsr_bb = get_basic_block_containing(target_bci - 1); |
|
1983 debug_only(BasicBlock* target_bb = &jsr_bb[1];) |
|
1984 assert(target_bb == get_basic_block_at(target_bci), "wrong calc. of successor basicblock"); |
|
1985 bool alive = jsr_bb->is_alive(); |
|
1986 if (TraceNewOopMapGeneration) { |
|
1987 tty->print("pc = %d, ret -> %d alive: %s\n", bci, target_bci, alive ? "true" : "false"); |
|
1988 } |
|
1989 if (alive) jmpFct(this, target_bci, data); |
|
1990 } |
|
1991 } |
|
1992 |
|
1993 // |
|
1994 // Debug method |
|
1995 // |
|
1996 char* GenerateOopMap::state_vec_to_string(CellTypeState* vec, int len) { |
|
1997 #ifdef ASSERT |
|
1998 int checklen = MAX3(_max_locals, _max_stack, _max_monitors) + 1; |
|
1999 assert(len < checklen, "state_vec_buf overflow"); |
|
2000 #endif |
|
2001 for (int i = 0; i < len; i++) _state_vec_buf[i] = vec[i].to_char(); |
|
2002 _state_vec_buf[len] = 0; |
|
2003 return _state_vec_buf; |
|
2004 } |
|
2005 |
|
2006 void GenerateOopMap::print_time() { |
|
2007 tty->print_cr ("Accumulated oopmap times:"); |
|
2008 tty->print_cr ("---------------------------"); |
|
2009 tty->print_cr (" Total : %3.3f sec.", GenerateOopMap::_total_oopmap_time.seconds()); |
|
2010 tty->print_cr (" (%3.0f bytecodes per sec) ", |
|
2011 GenerateOopMap::_total_byte_count / GenerateOopMap::_total_oopmap_time.seconds()); |
|
2012 } |
|
2013 |
|
2014 // |
|
2015 // ============ Main Entry Point =========== |
|
2016 // |
|
2017 GenerateOopMap::GenerateOopMap(methodHandle method) { |
|
2018 // We have to initialize all variables here, that can be queried direcly |
|
2019 _method = method; |
|
2020 _max_locals=0; |
|
2021 _init_vars = NULL; |
|
2022 |
|
2023 #ifndef PRODUCT |
|
2024 // If we are doing a detailed trace, include the regular trace information. |
|
2025 if (TraceNewOopMapGenerationDetailed) { |
|
2026 TraceNewOopMapGeneration = true; |
|
2027 } |
|
2028 #endif |
|
2029 } |
|
2030 |
|
2031 void GenerateOopMap::compute_map(TRAPS) { |
|
2032 #ifndef PRODUCT |
|
2033 if (TimeOopMap2) { |
|
2034 method()->print_short_name(tty); |
|
2035 tty->print(" "); |
|
2036 } |
|
2037 if (TimeOopMap) { |
|
2038 _total_byte_count += method()->code_size(); |
|
2039 } |
|
2040 #endif |
|
2041 TraceTime t_single("oopmap time", TimeOopMap2); |
|
2042 TraceTime t_all(NULL, &_total_oopmap_time, TimeOopMap); |
|
2043 |
|
2044 // Initialize values |
|
2045 _got_error = false; |
|
2046 _conflict = false; |
|
2047 _max_locals = method()->max_locals(); |
|
2048 _max_stack = method()->max_stack(); |
|
2049 _has_exceptions = (method()->exception_table()->length() > 0); |
|
2050 _nof_refval_conflicts = 0; |
|
2051 _init_vars = new GrowableArray<intptr_t>(5); // There are seldom more than 5 init_vars |
|
2052 _report_result = false; |
|
2053 _report_result_for_send = false; |
|
2054 _new_var_map = NULL; |
|
2055 _ret_adr_tos = new GrowableArray<intptr_t>(5); // 5 seems like a good number; |
|
2056 _did_rewriting = false; |
|
2057 _did_relocation = false; |
|
2058 |
|
2059 if (TraceNewOopMapGeneration) { |
|
2060 tty->print("Method name: %s\n", method()->name()->as_C_string()); |
|
2061 if (Verbose) { |
|
2062 _method->print_codes(); |
|
2063 tty->print_cr("Exception table:"); |
|
2064 typeArrayOop excps = method()->exception_table(); |
|
2065 for(int i = 0; i < excps->length(); i += 4) { |
|
2066 tty->print_cr("[%d - %d] -> %d", excps->int_at(i + 0), excps->int_at(i + 1), excps->int_at(i + 2)); |
|
2067 } |
|
2068 } |
|
2069 } |
|
2070 |
|
2071 // if no code - do nothing |
|
2072 // compiler needs info |
|
2073 if (method()->code_size() == 0 || _max_locals + method()->max_stack() == 0) { |
|
2074 fill_stackmap_prolog(0); |
|
2075 fill_stackmap_epilog(); |
|
2076 return; |
|
2077 } |
|
2078 // Step 1: Compute all jump targets and their return value |
|
2079 if (!_got_error) |
|
2080 _rt.compute_ret_table(_method); |
|
2081 |
|
2082 // Step 2: Find all basic blocks and count GC points |
|
2083 if (!_got_error) |
|
2084 mark_bbheaders_and_count_gc_points(); |
|
2085 |
|
2086 // Step 3: Calculate stack maps |
|
2087 if (!_got_error) |
|
2088 do_interpretation(); |
|
2089 |
|
2090 // Step 4:Return results |
|
2091 if (!_got_error && report_results()) |
|
2092 report_result(); |
|
2093 |
|
2094 if (_got_error) { |
|
2095 THROW_HANDLE(_exception); |
|
2096 } |
|
2097 } |
|
2098 |
|
2099 // Error handling methods |
|
2100 // These methods create an exception for the current thread which is thrown |
|
2101 // at the bottom of the call stack, when it returns to compute_map(). The |
|
2102 // _got_error flag controls execution. NOT TODO: The VM exception propagation |
|
2103 // mechanism using TRAPS/CHECKs could be used here instead but it would need |
|
2104 // to be added as a parameter to every function and checked for every call. |
|
2105 // The tons of extra code it would generate didn't seem worth the change. |
|
2106 // |
|
2107 void GenerateOopMap::error_work(const char *format, va_list ap) { |
|
2108 _got_error = true; |
|
2109 char msg_buffer[512]; |
|
2110 vsnprintf(msg_buffer, sizeof(msg_buffer), format, ap); |
|
2111 // Append method name |
|
2112 char msg_buffer2[512]; |
|
2113 jio_snprintf(msg_buffer2, sizeof(msg_buffer2), "%s in method %s", msg_buffer, method()->name()->as_C_string()); |
|
2114 _exception = Exceptions::new_exception(Thread::current(), |
|
2115 vmSymbols::java_lang_LinkageError(), msg_buffer2); |
|
2116 } |
|
2117 |
|
2118 void GenerateOopMap::report_error(const char *format, ...) { |
|
2119 va_list ap; |
|
2120 va_start(ap, format); |
|
2121 error_work(format, ap); |
|
2122 } |
|
2123 |
|
2124 void GenerateOopMap::verify_error(const char *format, ...) { |
|
2125 // We do not distinguish between different types of errors for verification |
|
2126 // errors. Let the verifier give a better message. |
|
2127 const char *msg = "Illegal class file encountered. Try running with -Xverify:all"; |
|
2128 error_work(msg, NULL); |
|
2129 } |
|
2130 |
|
2131 // |
|
2132 // Report result opcodes |
|
2133 // |
|
2134 void GenerateOopMap::report_result() { |
|
2135 |
|
2136 if (TraceNewOopMapGeneration) tty->print_cr("Report result pass"); |
|
2137 |
|
2138 // We now want to report the result of the parse |
|
2139 _report_result = true; |
|
2140 |
|
2141 // Prolog code |
|
2142 fill_stackmap_prolog(_gc_points); |
|
2143 |
|
2144 // Mark everything changed, then do one interpretation pass. |
|
2145 for (int i = 0; i<_bb_count; i++) { |
|
2146 if (_basic_blocks[i].is_reachable()) { |
|
2147 _basic_blocks[i].set_changed(true); |
|
2148 interp_bb(&_basic_blocks[i]); |
|
2149 } |
|
2150 } |
|
2151 |
|
2152 // Note: Since we are skipping dead-code when we are reporting results, then |
|
2153 // the no. of encountered gc-points might be fewer than the previously number |
|
2154 // we have counted. (dead-code is a pain - it should be removed before we get here) |
|
2155 fill_stackmap_epilog(); |
|
2156 |
|
2157 // Report initvars |
|
2158 fill_init_vars(_init_vars); |
|
2159 |
|
2160 _report_result = false; |
|
2161 } |
|
2162 |
|
2163 void GenerateOopMap::result_for_basicblock(int bci) { |
|
2164 if (TraceNewOopMapGeneration) tty->print_cr("Report result pass for basicblock"); |
|
2165 |
|
2166 // We now want to report the result of the parse |
|
2167 _report_result = true; |
|
2168 |
|
2169 // Find basicblock and report results |
|
2170 BasicBlock* bb = get_basic_block_containing(bci); |
|
2171 assert(bb->is_reachable(), "getting result from unreachable basicblock"); |
|
2172 bb->set_changed(true); |
|
2173 interp_bb(bb); |
|
2174 } |
|
2175 |
|
2176 // |
|
2177 // Conflict handling code |
|
2178 // |
|
2179 |
|
2180 void GenerateOopMap::record_refval_conflict(int varNo) { |
|
2181 assert(varNo>=0 && varNo< _max_locals, "index out of range"); |
|
2182 |
|
2183 if (TraceOopMapRewrites) { |
|
2184 tty->print("### Conflict detected (local no: %d)\n", varNo); |
|
2185 } |
|
2186 |
|
2187 if (!_new_var_map) { |
|
2188 _new_var_map = NEW_RESOURCE_ARRAY(int, _max_locals); |
|
2189 for (int k = 0; k < _max_locals; k++) _new_var_map[k] = k; |
|
2190 } |
|
2191 |
|
2192 if ( _new_var_map[varNo] == varNo) { |
|
2193 // Check if max. number of locals has been reached |
|
2194 if (_max_locals + _nof_refval_conflicts >= MAX_LOCAL_VARS) { |
|
2195 report_error("Rewriting exceeded local variable limit"); |
|
2196 return; |
|
2197 } |
|
2198 _new_var_map[varNo] = _max_locals + _nof_refval_conflicts; |
|
2199 _nof_refval_conflicts++; |
|
2200 } |
|
2201 } |
|
2202 |
|
2203 void GenerateOopMap::rewrite_refval_conflicts() |
|
2204 { |
|
2205 // We can get here two ways: Either a rewrite conflict was detected, or |
|
2206 // an uninitialize reference was detected. In the second case, we do not |
|
2207 // do any rewriting, we just want to recompute the reference set with the |
|
2208 // new information |
|
2209 |
|
2210 int nof_conflicts = 0; // Used for debugging only |
|
2211 |
|
2212 if ( _nof_refval_conflicts == 0 ) |
|
2213 return; |
|
2214 |
|
2215 // Check if rewrites are allowed in this parse. |
|
2216 if (!allow_rewrites() && !IgnoreRewrites) { |
|
2217 fatal("Rewriting method not allowed at this stage"); |
|
2218 } |
|
2219 |
|
2220 |
|
2221 // This following flag is to tempoary supress rewrites. The locals that might conflict will |
|
2222 // all be set to contain values. This is UNSAFE - however, until the rewriting has been completely |
|
2223 // tested it is nice to have. |
|
2224 if (IgnoreRewrites) { |
|
2225 if (Verbose) { |
|
2226 tty->print("rewrites suppressed for local no. "); |
|
2227 for (int l = 0; l < _max_locals; l++) { |
|
2228 if (_new_var_map[l] != l) { |
|
2229 tty->print("%d ", l); |
|
2230 vars()[l] = CellTypeState::value; |
|
2231 } |
|
2232 } |
|
2233 tty->cr(); |
|
2234 } |
|
2235 |
|
2236 // That was that... |
|
2237 _new_var_map = NULL; |
|
2238 _nof_refval_conflicts = 0; |
|
2239 _conflict = false; |
|
2240 |
|
2241 return; |
|
2242 } |
|
2243 |
|
2244 // Tracing flag |
|
2245 _did_rewriting = true; |
|
2246 |
|
2247 if (TraceOopMapRewrites) { |
|
2248 tty->print_cr("ref/value conflict for method %s - bytecodes are getting rewritten", method()->name()->as_C_string()); |
|
2249 method()->print(); |
|
2250 method()->print_codes(); |
|
2251 } |
|
2252 |
|
2253 assert(_new_var_map!=NULL, "nothing to rewrite"); |
|
2254 assert(_conflict==true, "We should not be here"); |
|
2255 |
|
2256 compute_ret_adr_at_TOS(); |
|
2257 if (!_got_error) { |
|
2258 for (int k = 0; k < _max_locals && !_got_error; k++) { |
|
2259 if (_new_var_map[k] != k) { |
|
2260 if (TraceOopMapRewrites) { |
|
2261 tty->print_cr("Rewriting: %d -> %d", k, _new_var_map[k]); |
|
2262 } |
|
2263 rewrite_refval_conflict(k, _new_var_map[k]); |
|
2264 if (_got_error) return; |
|
2265 nof_conflicts++; |
|
2266 } |
|
2267 } |
|
2268 } |
|
2269 |
|
2270 assert(nof_conflicts == _nof_refval_conflicts, "sanity check"); |
|
2271 |
|
2272 // Adjust the number of locals |
|
2273 method()->set_max_locals(_max_locals+_nof_refval_conflicts); |
|
2274 _max_locals += _nof_refval_conflicts; |
|
2275 |
|
2276 // That was that... |
|
2277 _new_var_map = NULL; |
|
2278 _nof_refval_conflicts = 0; |
|
2279 } |
|
2280 |
|
2281 void GenerateOopMap::rewrite_refval_conflict(int from, int to) { |
|
2282 bool startOver; |
|
2283 do { |
|
2284 // Make sure that the BytecodeStream is constructed in the loop, since |
|
2285 // during rewriting a new method oop is going to be used, and the next time |
|
2286 // around we want to use that. |
|
2287 BytecodeStream bcs(_method); |
|
2288 startOver = false; |
|
2289 |
|
2290 while( bcs.next() >=0 && !startOver && !_got_error) { |
|
2291 startOver = rewrite_refval_conflict_inst(&bcs, from, to); |
|
2292 } |
|
2293 } while (startOver && !_got_error); |
|
2294 } |
|
2295 |
|
2296 /* If the current instruction is one that uses local variable "from" |
|
2297 in a ref way, change it to use "to". There's a subtle reason why we |
|
2298 renumber the ref uses and not the non-ref uses: non-ref uses may be |
|
2299 2 slots wide (double, long) which would necessitate keeping track of |
|
2300 whether we should add one or two variables to the method. If the change |
|
2301 affected the width of some instruction, returns "TRUE"; otherwise, returns "FALSE". |
|
2302 Another reason for moving ref's value is for solving (addr, ref) conflicts, which |
|
2303 both uses aload/astore methods. |
|
2304 */ |
|
2305 bool GenerateOopMap::rewrite_refval_conflict_inst(BytecodeStream *itr, int from, int to) { |
|
2306 Bytecodes::Code bc = itr->code(); |
|
2307 int index; |
|
2308 int bci = itr->bci(); |
|
2309 |
|
2310 if (is_aload(itr, &index) && index == from) { |
|
2311 if (TraceOopMapRewrites) { |
|
2312 tty->print_cr("Rewriting aload at bci: %d", bci); |
|
2313 } |
|
2314 return rewrite_load_or_store(itr, Bytecodes::_aload, Bytecodes::_aload_0, to); |
|
2315 } |
|
2316 |
|
2317 if (is_astore(itr, &index) && index == from) { |
|
2318 if (!stack_top_holds_ret_addr(bci)) { |
|
2319 if (TraceOopMapRewrites) { |
|
2320 tty->print_cr("Rewriting astore at bci: %d", bci); |
|
2321 } |
|
2322 return rewrite_load_or_store(itr, Bytecodes::_astore, Bytecodes::_astore_0, to); |
|
2323 } else { |
|
2324 if (TraceOopMapRewrites) { |
|
2325 tty->print_cr("Supress rewriting of astore at bci: %d", bci); |
|
2326 } |
|
2327 } |
|
2328 } |
|
2329 |
|
2330 return false; |
|
2331 } |
|
2332 |
|
2333 // The argument to this method is: |
|
2334 // bc : Current bytecode |
|
2335 // bcN : either _aload or _astore |
|
2336 // bc0 : either _aload_0 or _astore_0 |
|
2337 bool GenerateOopMap::rewrite_load_or_store(BytecodeStream *bcs, Bytecodes::Code bcN, Bytecodes::Code bc0, unsigned int varNo) { |
|
2338 assert(bcN == Bytecodes::_astore || bcN == Bytecodes::_aload, "wrong argument (bcN)"); |
|
2339 assert(bc0 == Bytecodes::_astore_0 || bc0 == Bytecodes::_aload_0, "wrong argument (bc0)"); |
|
2340 int ilen = Bytecodes::length_at(bcs->bcp()); |
|
2341 int newIlen; |
|
2342 |
|
2343 if (ilen == 4) { |
|
2344 // Original instruction was wide; keep it wide for simplicity |
|
2345 newIlen = 4; |
|
2346 } else if (varNo < 4) |
|
2347 newIlen = 1; |
|
2348 else if (varNo >= 256) |
|
2349 newIlen = 4; |
|
2350 else |
|
2351 newIlen = 2; |
|
2352 |
|
2353 // If we need to relocate in order to patch the byte, we |
|
2354 // do the patching in a temp. buffer, that is passed to the reloc. |
|
2355 // The patching of the bytecode stream is then done by the Relocator. |
|
2356 // This is neccesary, since relocating the instruction at a certain bci, might |
|
2357 // also relocate that instruction, e.g., if a _goto before it gets widen to a _goto_w. |
|
2358 // Hence, we do not know which bci to patch after relocation. |
|
2359 |
|
2360 assert(newIlen <= 4, "sanity check"); |
|
2361 u_char inst_buffer[4]; // Max. instruction size is 4. |
|
2362 address bcp; |
|
2363 |
|
2364 if (newIlen != ilen) { |
|
2365 // Relocation needed do patching in temp. buffer |
|
2366 bcp = (address)inst_buffer; |
|
2367 } else { |
|
2368 bcp = _method->bcp_from(bcs->bci()); |
|
2369 } |
|
2370 |
|
2371 // Patch either directly in methodOop or in temp. buffer |
|
2372 if (newIlen == 1) { |
|
2373 assert(varNo < 4, "varNo too large"); |
|
2374 *bcp = bc0 + varNo; |
|
2375 } else if (newIlen == 2) { |
|
2376 assert(varNo < 256, "2-byte index needed!"); |
|
2377 *(bcp + 0) = bcN; |
|
2378 *(bcp + 1) = varNo; |
|
2379 } else { |
|
2380 assert(newIlen == 4, "Wrong instruction length"); |
|
2381 *(bcp + 0) = Bytecodes::_wide; |
|
2382 *(bcp + 1) = bcN; |
|
2383 Bytes::put_Java_u2(bcp+2, varNo); |
|
2384 } |
|
2385 |
|
2386 if (newIlen != ilen) { |
|
2387 expand_current_instr(bcs->bci(), ilen, newIlen, inst_buffer); |
|
2388 } |
|
2389 |
|
2390 |
|
2391 return (newIlen != ilen); |
|
2392 } |
|
2393 |
|
2394 class RelocCallback : public RelocatorListener { |
|
2395 private: |
|
2396 GenerateOopMap* _gom; |
|
2397 public: |
|
2398 RelocCallback(GenerateOopMap* gom) { _gom = gom; }; |
|
2399 |
|
2400 // Callback method |
|
2401 virtual void relocated(int bci, int delta, int new_code_length) { |
|
2402 _gom->update_basic_blocks (bci, delta, new_code_length); |
|
2403 _gom->update_ret_adr_at_TOS(bci, delta); |
|
2404 _gom->_rt.update_ret_table (bci, delta); |
|
2405 } |
|
2406 }; |
|
2407 |
|
2408 // Returns true if expanding was succesful. Otherwise, reports an error and |
|
2409 // returns false. |
|
2410 void GenerateOopMap::expand_current_instr(int bci, int ilen, int newIlen, u_char inst_buffer[]) { |
|
2411 Thread *THREAD = Thread::current(); // Could really have TRAPS argument. |
|
2412 RelocCallback rcb(this); |
|
2413 Relocator rc(_method, &rcb); |
|
2414 methodHandle m= rc.insert_space_at(bci, newIlen, inst_buffer, THREAD); |
|
2415 if (m.is_null() || HAS_PENDING_EXCEPTION) { |
|
2416 report_error("could not rewrite method - exception occurred or bytecode buffer overflow"); |
|
2417 return; |
|
2418 } |
|
2419 |
|
2420 // Relocator returns a new method oop. |
|
2421 _did_relocation = true; |
|
2422 _method = m; |
|
2423 } |
|
2424 |
|
2425 |
|
2426 bool GenerateOopMap::is_astore(BytecodeStream *itr, int *index) { |
|
2427 Bytecodes::Code bc = itr->code(); |
|
2428 switch(bc) { |
|
2429 case Bytecodes::_astore_0: |
|
2430 case Bytecodes::_astore_1: |
|
2431 case Bytecodes::_astore_2: |
|
2432 case Bytecodes::_astore_3: |
|
2433 *index = bc - Bytecodes::_astore_0; |
|
2434 return true; |
|
2435 case Bytecodes::_astore: |
|
2436 *index = itr->get_index(); |
|
2437 return true; |
|
2438 } |
|
2439 return false; |
|
2440 } |
|
2441 |
|
2442 bool GenerateOopMap::is_aload(BytecodeStream *itr, int *index) { |
|
2443 Bytecodes::Code bc = itr->code(); |
|
2444 switch(bc) { |
|
2445 case Bytecodes::_aload_0: |
|
2446 case Bytecodes::_aload_1: |
|
2447 case Bytecodes::_aload_2: |
|
2448 case Bytecodes::_aload_3: |
|
2449 *index = bc - Bytecodes::_aload_0; |
|
2450 return true; |
|
2451 |
|
2452 case Bytecodes::_aload: |
|
2453 *index = itr->get_index(); |
|
2454 return true; |
|
2455 } |
|
2456 return false; |
|
2457 } |
|
2458 |
|
2459 |
|
2460 // Return true iff the top of the operand stack holds a return address at |
|
2461 // the current instruction |
|
2462 bool GenerateOopMap::stack_top_holds_ret_addr(int bci) { |
|
2463 for(int i = 0; i < _ret_adr_tos->length(); i++) { |
|
2464 if (_ret_adr_tos->at(i) == bci) |
|
2465 return true; |
|
2466 } |
|
2467 |
|
2468 return false; |
|
2469 } |
|
2470 |
|
2471 void GenerateOopMap::compute_ret_adr_at_TOS() { |
|
2472 assert(_ret_adr_tos != NULL, "must be initialized"); |
|
2473 _ret_adr_tos->clear(); |
|
2474 |
|
2475 for (int i = 0; i < bb_count(); i++) { |
|
2476 BasicBlock* bb = &_basic_blocks[i]; |
|
2477 |
|
2478 // Make sure to only check basicblocks that are reachable |
|
2479 if (bb->is_reachable()) { |
|
2480 |
|
2481 // For each Basic block we check all instructions |
|
2482 BytecodeStream bcs(_method); |
|
2483 bcs.set_interval(bb->_bci, next_bb_start_pc(bb)); |
|
2484 |
|
2485 restore_state(bb); |
|
2486 |
|
2487 while (bcs.next()>=0 && !_got_error) { |
|
2488 // TDT: should this be is_good_address() ? |
|
2489 if (_stack_top > 0 && stack()[_stack_top-1].is_address()) { |
|
2490 _ret_adr_tos->append(bcs.bci()); |
|
2491 if (TraceNewOopMapGeneration) { |
|
2492 tty->print_cr("Ret_adr TOS at bci: %d", bcs.bci()); |
|
2493 } |
|
2494 } |
|
2495 interp1(&bcs); |
|
2496 } |
|
2497 } |
|
2498 } |
|
2499 } |
|
2500 |
|
2501 void GenerateOopMap::update_ret_adr_at_TOS(int bci, int delta) { |
|
2502 for(int i = 0; i < _ret_adr_tos->length(); i++) { |
|
2503 int v = _ret_adr_tos->at(i); |
|
2504 if (v > bci) _ret_adr_tos->at_put(i, v + delta); |
|
2505 } |
|
2506 } |
|
2507 |
|
2508 // =================================================================== |
|
2509 |
|
2510 #ifndef PRODUCT |
|
2511 int ResolveOopMapConflicts::_nof_invocations = 0; |
|
2512 int ResolveOopMapConflicts::_nof_rewrites = 0; |
|
2513 int ResolveOopMapConflicts::_nof_relocations = 0; |
|
2514 #endif |
|
2515 |
|
2516 methodHandle ResolveOopMapConflicts::do_potential_rewrite(TRAPS) { |
|
2517 compute_map(CHECK_(methodHandle())); |
|
2518 |
|
2519 #ifndef PRODUCT |
|
2520 // Tracking and statistics |
|
2521 if (PrintRewrites) { |
|
2522 _nof_invocations++; |
|
2523 if (did_rewriting()) { |
|
2524 _nof_rewrites++; |
|
2525 if (did_relocation()) _nof_relocations++; |
|
2526 tty->print("Method was rewritten %s: ", (did_relocation()) ? "and relocated" : ""); |
|
2527 method()->print_value(); tty->cr(); |
|
2528 tty->print_cr("Cand.: %d rewrts: %d (%d%%) reloc.: %d (%d%%)", |
|
2529 _nof_invocations, |
|
2530 _nof_rewrites, (_nof_rewrites * 100) / _nof_invocations, |
|
2531 _nof_relocations, (_nof_relocations * 100) / _nof_invocations); |
|
2532 } |
|
2533 } |
|
2534 #endif |
|
2535 return methodHandle(THREAD, method()); |
|
2536 } |