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1 /*
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2 * Copyright 1998-2006 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 class ciMethod;
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26
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27 class MethodLivenessResult : public BitMap {
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28 private:
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29 bool _is_valid;
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30
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31 public:
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342
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32 MethodLivenessResult(BitMap::bm_word_t* map, idx_t size_in_bits)
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0
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33 : BitMap(map, size_in_bits)
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34 , _is_valid(false)
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35 {}
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36
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37 MethodLivenessResult(idx_t size_in_bits)
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38 : BitMap(size_in_bits)
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39 , _is_valid(false)
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40 {}
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41
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42 void set_is_valid() { _is_valid = true; }
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43 bool is_valid() { return _is_valid; }
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44 };
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45
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46 class MethodLiveness : public ResourceObj {
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47 public:
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48 // The BasicBlock class is used to represent a basic block in the
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49 // liveness analysis.
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50 class BasicBlock : public ResourceObj {
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51 private:
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52 // This class is only used by the MethodLiveness class.
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53 friend class MethodLiveness;
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54
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55 // The analyzer which created this basic block.
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56 MethodLiveness* _analyzer;
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57
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58 // The range of this basic block is [start_bci,limit_bci)
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59 int _start_bci;
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60 int _limit_bci;
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61
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62 // The liveness at the start of the block;
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63 BitMap _entry;
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64
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65 // The summarized liveness effects of our direct successors reached
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66 // by normal control flow
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67 BitMap _normal_exit;
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68
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69 // The summarized liveness effects of our direct successors reached
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70 // by exceptional control flow
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71 BitMap _exception_exit;
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72
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73 // These members hold the results of the last call to
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74 // compute_gen_kill_range(). _gen is the set of locals
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75 // used before they are defined in the range. _kill is the
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76 // set of locals defined before they are used.
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77 BitMap _gen;
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78 BitMap _kill;
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79 int _last_bci;
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80
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81 // A list of all blocks which could come directly before this one
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82 // in normal (non-exceptional) control flow. We propagate liveness
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83 // information to these blocks.
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84 GrowableArray<BasicBlock*>* _normal_predecessors;
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85
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86 // A list of all blocks which could come directly before this one
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87 // in exceptional control flow.
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88 GrowableArray<BasicBlock*>* _exception_predecessors;
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89
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90 // The following fields are used to manage a work list used in the
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91 // dataflow.
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92 BasicBlock *_next;
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93 bool _on_work_list;
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94
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95 // Our successors call this method to merge liveness information into
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96 // our _normal_exit member.
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97 bool merge_normal(BitMap other);
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98
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99 // Our successors call this method to merge liveness information into
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100 // our _exception_exit member.
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101 bool merge_exception(BitMap other);
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102
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103 // This helper routine is used to help compute the gen/kill pair for
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104 // the block. It is also used to answer queries.
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105 void compute_gen_kill_range(ciBytecodeStream *bytes);
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106
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107 // Compute the gen/kill effect of a single instruction.
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108 void compute_gen_kill_single(ciBytecodeStream *instruction);
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109
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110 // Helpers for compute_gen_kill_single.
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111 void load_one(int local);
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112 void load_two(int local);
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113 void store_one(int local);
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114 void store_two(int local);
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115
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116 BasicBlock(MethodLiveness *analyzer, int start, int limit);
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117
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118 // -- Accessors
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119
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120 int start_bci() const { return _start_bci; }
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121
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122 int limit_bci() const { return _limit_bci; }
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123 void set_limit_bci(int limit) { _limit_bci = limit; }
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124
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125 BasicBlock *next() const { return _next; }
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126 void set_next(BasicBlock *next) { _next = next; }
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127
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128 bool on_work_list() const { return _on_work_list; }
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129 void set_on_work_list(bool val) { _on_work_list = val; }
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130
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131 // -- Flow graph construction.
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132
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133 // Add a basic block to our list of normal predecessors.
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134 void add_normal_predecessor(BasicBlock *pred) {
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135 _normal_predecessors->append_if_missing(pred);
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136 }
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137
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138 // Add a basic block to our list of exceptional predecessors
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139 void add_exception_predecessor(BasicBlock *pred) {
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140 _exception_predecessors->append_if_missing(pred);
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141 }
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142
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143 // Split the basic block at splitBci. This basic block
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144 // becomes the second half. The first half is newly created.
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145 BasicBlock *split(int splitBci);
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146
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147 // -- Dataflow.
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148
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149 void compute_gen_kill(ciMethod* method);
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150
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151 // Propagate changes from this basic block
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152 void propagate(MethodLiveness *ml);
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153
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154 // -- Query.
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155
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156 MethodLivenessResult get_liveness_at(ciMethod* method, int bci);
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157
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158 // -- Debugging.
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159
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160 void print_on(outputStream *os) const PRODUCT_RETURN;
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161
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162 }; // End of MethodLiveness::BasicBlock
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163
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164 private:
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165 // The method we are analyzing.
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166 ciMethod* _method;
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167 ciMethod* method() const { return _method; }
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168
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169 // The arena for storing structures...
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170 Arena* _arena;
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171 Arena* arena() const { return _arena; }
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172
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173 // We cache the length of the method.
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174 int _code_size;
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175
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176 // The size of a BitMap.
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177 int _bit_map_size_bits;
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178 int _bit_map_size_words;
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179
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180 // A list of all BasicBlocks.
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181 BasicBlock **_block_list;
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182
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183 // number of blocks
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184 int _block_count;
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185
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186 // Keeps track of bci->block mapping. One entry for each bci. Only block starts are
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187 // recorded.
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188 GrowableArray<BasicBlock*>* _block_map;
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189
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190 // Our work list.
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191 BasicBlock *_work_list;
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192
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193 #ifdef COMPILER1
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194 // bcis where blocks start are marked
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195 BitMap _bci_block_start;
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196 #endif // COMPILER1
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197
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198 // -- Graph construction & Analysis
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199
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200 // Compute ranges and predecessors for basic blocks.
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201 void init_basic_blocks();
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202
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203 // Compute gen/kill information for all basic blocks.
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204 void init_gen_kill();
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205
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206 // Perform the dataflow.
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207 void propagate_liveness();
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208
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209 // The class MethodLiveness::BasicBlock needs special access to some
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210 // of our members.
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211 friend class MethodLiveness::BasicBlock;
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212
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213 // And accessors.
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214 int bit_map_size_bits() const { return _bit_map_size_bits; }
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215 int bit_map_size_words() const { return _bit_map_size_words; }
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216
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217 // Work list manipulation routines. Called internally by BasicBlock.
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218 BasicBlock *work_list_get();
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219 void work_list_add(BasicBlock *block);
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220
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221 // -- Timing and Statistics.
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222
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223
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224 // Timers
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225 static elapsedTimer _time_build_graph;
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226 static elapsedTimer _time_gen_kill;
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227 static elapsedTimer _time_flow;
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228 static elapsedTimer _time_query;
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229 static elapsedTimer _time_total;
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230
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231 #ifndef PRODUCT
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232
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233 // Counts
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234 static long _total_bytes;
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235 static int _total_methods;
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236
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237 static long _total_blocks;
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238 static int _max_method_blocks;
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239
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240 static long _total_edges;
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241 static int _max_block_edges;
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242
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243 static long _total_exc_edges;
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244 static int _max_block_exc_edges;
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245
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246 static long _total_method_locals;
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247 static int _max_method_locals;
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248
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249 static long _total_locals_queried;
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250 static long _total_live_locals_queried;
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251
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252 static long _total_visits;
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253
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254 #endif
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255
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256 public:
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257 // Create a liveness analyzer for a method
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258 MethodLiveness(Arena* arena, ciMethod* method);
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259
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260 // Compute liveness information for the method
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261 void compute_liveness();
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262
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263 // Find out which locals are live at a specific bci.
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264 MethodLivenessResult get_liveness_at(int bci);
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265
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266 #ifdef COMPILER1
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267 const BitMap get_bci_block_start() const { return _bci_block_start; }
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268 #endif // COMPILER1
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269
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270 static void print_times() PRODUCT_RETURN;
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271 };
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