Mercurial > hg > CbC > CbC_gcc
annotate gcc/ipa-reference.c @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
| author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 22 Mar 2011 17:18:12 +0900 |
| parents | b7f97abdc517 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* Callgraph based analysis of static variables. |
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2 Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010 |
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3 Free Software Foundation, Inc. |
| 0 | 4 Contributed by Kenneth Zadeck <zadeck@naturalbridge.com> |
| 5 | |
| 6 This file is part of GCC. | |
| 7 | |
| 8 GCC is free software; you can redistribute it and/or modify it under | |
| 9 the terms of the GNU General Public License as published by the Free | |
| 10 Software Foundation; either version 3, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with GCC; see the file COPYING3. If not see | |
| 20 <http://www.gnu.org/licenses/>. */ | |
| 21 | |
| 22 /* This file gathers information about how variables whose scope is | |
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23 confined to the compilation unit are used. |
| 0 | 24 |
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25 The transitive call site specific clobber effects are computed |
| 0 | 26 for the variables whose scope is contained within this compilation |
| 27 unit. | |
| 28 | |
| 29 First each function and static variable initialization is analyzed | |
| 30 to determine which local static variables are either read, written, | |
| 31 or have their address taken. Any local static that has its address | |
| 32 taken is removed from consideration. Once the local read and | |
| 33 writes are determined, a transitive closure of this information is | |
| 34 performed over the call graph to determine the worst case set of | |
| 35 side effects of each call. In later parts of the compiler, these | |
| 36 local and global sets are examined to make the call clobbering less | |
| 37 traumatic, promote some statics to registers, and improve aliasing | |
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38 information. */ |
| 0 | 39 |
| 40 #include "config.h" | |
| 41 #include "system.h" | |
| 42 #include "coretypes.h" | |
| 43 #include "tm.h" | |
| 44 #include "tree.h" | |
| 45 #include "tree-flow.h" | |
| 46 #include "tree-inline.h" | |
| 47 #include "tree-pass.h" | |
| 48 #include "langhooks.h" | |
| 49 #include "pointer-set.h" | |
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50 #include "splay-tree.h" |
| 0 | 51 #include "ggc.h" |
| 52 #include "ipa-utils.h" | |
| 53 #include "ipa-reference.h" | |
| 54 #include "gimple.h" | |
| 55 #include "cgraph.h" | |
| 56 #include "output.h" | |
| 57 #include "flags.h" | |
| 58 #include "timevar.h" | |
| 59 #include "diagnostic.h" | |
| 60 #include "langhooks.h" | |
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61 #include "lto-streamer.h" |
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62 |
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63 static void remove_node_data (struct cgraph_node *node, |
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64 void *data ATTRIBUTE_UNUSED); |
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65 static void duplicate_node_data (struct cgraph_node *src, |
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66 struct cgraph_node *dst, |
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67 void *data ATTRIBUTE_UNUSED); |
| 0 | 68 |
| 69 /* The static variables defined within the compilation unit that are | |
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70 loaded or stored directly by function that owns this structure. */ |
| 0 | 71 |
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72 struct ipa_reference_local_vars_info_d |
| 0 | 73 { |
| 74 bitmap statics_read; | |
| 75 bitmap statics_written; | |
| 76 }; | |
| 77 | |
| 78 /* Statics that are read and written by some set of functions. The | |
| 79 local ones are based on the loads and stores local to the function. | |
| 80 The global ones are based on the local info as well as the | |
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81 transitive closure of the functions that are called. */ |
| 0 | 82 |
| 83 struct ipa_reference_global_vars_info_d | |
| 84 { | |
| 85 bitmap statics_read; | |
| 86 bitmap statics_written; | |
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87 }; |
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88 |
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89 /* Information we save about every function after ipa-reference is completed. */ |
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90 |
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91 struct ipa_reference_optimization_summary_d |
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92 { |
| 0 | 93 bitmap statics_not_read; |
| 94 bitmap statics_not_written; | |
| 95 }; | |
| 96 | |
| 97 typedef struct ipa_reference_local_vars_info_d *ipa_reference_local_vars_info_t; | |
| 98 typedef struct ipa_reference_global_vars_info_d *ipa_reference_global_vars_info_t; | |
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99 typedef struct ipa_reference_optimization_summary_d *ipa_reference_optimization_summary_t; |
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100 |
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101 struct ipa_reference_vars_info_d |
| 0 | 102 { |
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103 struct ipa_reference_local_vars_info_d local; |
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104 struct ipa_reference_global_vars_info_d global; |
| 0 | 105 }; |
| 106 | |
| 107 typedef struct ipa_reference_vars_info_d *ipa_reference_vars_info_t; | |
| 108 | |
| 109 /* This splay tree contains all of the static variables that are | |
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110 being considered by the compilation level alias analysis. */ |
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111 static splay_tree reference_vars_to_consider; |
| 0 | 112 |
| 113 /* A bit is set for every module static we are considering. This is | |
| 114 ored into the local info when asm code is found that clobbers all | |
| 115 memory. */ | |
| 116 static bitmap all_module_statics; | |
| 117 | |
| 118 /* Obstack holding bitmaps of local analysis (live from analysis to | |
| 119 propagation) */ | |
| 120 static bitmap_obstack local_info_obstack; | |
| 121 /* Obstack holding global analysis live forever. */ | |
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122 static bitmap_obstack optimization_summary_obstack; |
| 0 | 123 |
| 124 /* Holders of ipa cgraph hooks: */ | |
| 125 static struct cgraph_2node_hook_list *node_duplication_hook_holder; | |
| 126 static struct cgraph_node_hook_list *node_removal_hook_holder; | |
| 127 | |
| 128 /* Vector where the reference var infos are actually stored. */ | |
| 129 DEF_VEC_P (ipa_reference_vars_info_t); | |
| 130 DEF_VEC_ALLOC_P (ipa_reference_vars_info_t, heap); | |
| 131 static VEC (ipa_reference_vars_info_t, heap) *ipa_reference_vars_vector; | |
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132 DEF_VEC_P (ipa_reference_optimization_summary_t); |
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133 DEF_VEC_ALLOC_P (ipa_reference_optimization_summary_t, heap); |
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134 static VEC (ipa_reference_optimization_summary_t, heap) *ipa_reference_opt_sum_vector; |
| 0 | 135 |
| 136 /* Return the ipa_reference_vars structure starting from the cgraph NODE. */ | |
| 137 static inline ipa_reference_vars_info_t | |
| 138 get_reference_vars_info (struct cgraph_node *node) | |
| 139 { | |
| 140 if (!ipa_reference_vars_vector | |
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141 || VEC_length (ipa_reference_vars_info_t, |
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142 ipa_reference_vars_vector) <= (unsigned int) node->uid) |
| 0 | 143 return NULL; |
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144 return VEC_index (ipa_reference_vars_info_t, ipa_reference_vars_vector, |
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145 node->uid); |
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146 } |
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147 |
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148 /* Return the ipa_reference_vars structure starting from the cgraph NODE. */ |
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149 static inline ipa_reference_optimization_summary_t |
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150 get_reference_optimization_summary (struct cgraph_node *node) |
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151 { |
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152 if (!ipa_reference_opt_sum_vector |
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153 || (VEC_length (ipa_reference_optimization_summary_t, |
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154 ipa_reference_opt_sum_vector) |
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155 <= (unsigned int) node->uid)) |
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156 return NULL; |
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157 return VEC_index (ipa_reference_optimization_summary_t, ipa_reference_opt_sum_vector, |
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158 node->uid); |
| 0 | 159 } |
| 160 | |
| 161 /* Return the ipa_reference_vars structure starting from the cgraph NODE. */ | |
| 162 static inline void | |
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163 set_reference_vars_info (struct cgraph_node *node, |
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164 ipa_reference_vars_info_t info) |
| 0 | 165 { |
| 166 if (!ipa_reference_vars_vector | |
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167 || VEC_length (ipa_reference_vars_info_t, |
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168 ipa_reference_vars_vector) <= (unsigned int) node->uid) |
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169 VEC_safe_grow_cleared (ipa_reference_vars_info_t, heap, |
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170 ipa_reference_vars_vector, node->uid + 1); |
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171 VEC_replace (ipa_reference_vars_info_t, ipa_reference_vars_vector, |
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172 node->uid, info); |
| 0 | 173 } |
| 174 | |
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175 /* Return the ipa_reference_vars structure starting from the cgraph NODE. */ |
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176 static inline void |
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177 set_reference_optimization_summary (struct cgraph_node *node, |
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178 ipa_reference_optimization_summary_t info) |
| 0 | 179 { |
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180 if (!ipa_reference_opt_sum_vector |
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181 || (VEC_length (ipa_reference_optimization_summary_t, |
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182 ipa_reference_opt_sum_vector) |
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183 <= (unsigned int) node->uid)) |
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184 VEC_safe_grow_cleared (ipa_reference_optimization_summary_t, |
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185 heap, ipa_reference_opt_sum_vector, node->uid + 1); |
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186 VEC_replace (ipa_reference_optimization_summary_t, |
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187 ipa_reference_opt_sum_vector, node->uid, info); |
| 0 | 188 } |
| 189 | |
| 190 /* Return a bitmap indexed by_DECL_UID uid for the static variables | |
| 191 that are not read during the execution of the function FN. Returns | |
| 192 NULL if no data is available. */ | |
| 193 | |
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194 bitmap |
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195 ipa_reference_get_not_read_global (struct cgraph_node *fn) |
| 0 | 196 { |
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197 ipa_reference_optimization_summary_t info; |
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198 |
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199 info = get_reference_optimization_summary (fn); |
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200 if (info) |
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201 return info->statics_not_read; |
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202 else if (flags_from_decl_or_type (fn->decl) & ECF_LEAF) |
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203 return all_module_statics; |
| 0 | 204 else |
| 205 return NULL; | |
| 206 } | |
| 207 | |
| 208 /* Return a bitmap indexed by DECL_UID uid for the static variables | |
| 209 that are not written during the execution of the function FN. Note | |
| 210 that variables written may or may not be read during the function | |
| 211 call. Returns NULL if no data is available. */ | |
| 212 | |
|
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213 bitmap |
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214 ipa_reference_get_not_written_global (struct cgraph_node *fn) |
| 0 | 215 { |
|
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216 ipa_reference_optimization_summary_t info; |
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217 |
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218 info = get_reference_optimization_summary (fn); |
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219 if (info) |
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220 return info->statics_not_written; |
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221 else if (flags_from_decl_or_type (fn->decl) & ECF_LEAF) |
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222 return all_module_statics; |
| 0 | 223 else |
| 224 return NULL; | |
| 225 } | |
| 226 | |
| 227 | |
| 228 | |
| 229 /* Add VAR to all_module_statics and the two | |
| 230 reference_vars_to_consider* sets. */ | |
| 231 | |
|
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232 static inline void |
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233 add_static_var (tree var) |
| 0 | 234 { |
| 235 int uid = DECL_UID (var); | |
| 236 gcc_assert (TREE_CODE (var) == VAR_DECL); | |
|
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237 if (dump_file) |
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238 splay_tree_insert (reference_vars_to_consider, |
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239 uid, (splay_tree_value)var); |
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240 bitmap_set_bit (all_module_statics, uid); |
| 0 | 241 } |
| 242 | |
| 243 /* Return true if the variable T is the right kind of static variable to | |
| 244 perform compilation unit scope escape analysis. */ | |
| 245 | |
|
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246 static inline bool |
|
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247 is_proper_for_analysis (tree t) |
| 0 | 248 { |
|
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249 /* We handle only variables whose address is never taken. */ |
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250 if (TREE_ADDRESSABLE (t)) |
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251 return false; |
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252 |
| 0 | 253 /* If the variable has the "used" attribute, treat it as if it had a |
| 254 been touched by the devil. */ | |
|
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255 if (DECL_PRESERVE_P (t)) |
| 0 | 256 return false; |
| 257 | |
| 258 /* Do not want to do anything with volatile except mark any | |
| 259 function that uses one to be not const or pure. */ | |
|
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260 if (TREE_THIS_VOLATILE (t)) |
| 0 | 261 return false; |
| 262 | |
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263 /* We do not need to analyze readonly vars, we already know they do not |
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264 alias. */ |
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265 if (TREE_READONLY (t)) |
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266 return false; |
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267 |
| 0 | 268 /* We cannot touch decls where the type needs constructing. */ |
| 269 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (t))) | |
| 270 return false; | |
| 271 | |
| 272 /* This is a variable we care about. Check if we have seen it | |
| 273 before, and if not add it the set of variables we care about. */ | |
|
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274 if (all_module_statics |
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275 && !bitmap_bit_p (all_module_statics, DECL_UID (t))) |
| 0 | 276 add_static_var (t); |
| 277 | |
| 278 return true; | |
| 279 } | |
| 280 | |
| 281 /* Lookup the tree node for the static variable that has UID and | |
| 282 convert the name to a string for debugging. */ | |
| 283 | |
| 284 static const char * | |
| 285 get_static_name (int index) | |
| 286 { | |
|
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287 splay_tree_node stn = |
| 0 | 288 splay_tree_lookup (reference_vars_to_consider, index); |
| 289 if (stn) | |
| 290 return lang_hooks.decl_printable_name ((tree)(stn->value), 2); | |
| 291 return NULL; | |
| 292 } | |
| 293 | |
| 294 /* Or in all of the bits from every callee of X into X_GLOBAL, the caller's cycle, | |
| 295 bit vector. There are several cases to check to avoid the sparse | |
| 296 bitmap oring. */ | |
| 297 | |
| 298 static void | |
| 299 propagate_bits (ipa_reference_global_vars_info_t x_global, struct cgraph_node *x) | |
| 300 { | |
| 301 struct cgraph_edge *e; | |
|
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302 for (e = x->callees; e; e = e->next_callee) |
| 0 | 303 { |
| 304 struct cgraph_node *y = e->callee; | |
|
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305 enum availability avail; |
| 0 | 306 |
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307 avail = cgraph_function_body_availability (e->callee); |
|
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308 /* Only look into nodes we can propagate something. */ |
|
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309 if (avail > AVAIL_OVERWRITABLE |
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310 || (avail == AVAIL_OVERWRITABLE |
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311 && (flags_from_decl_or_type (e->callee->decl) & ECF_LEAF))) |
| 0 | 312 { |
|
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313 int flags = flags_from_decl_or_type (e->callee->decl); |
| 0 | 314 if (get_reference_vars_info (y)) |
| 315 { | |
|
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316 ipa_reference_vars_info_t y_info |
| 0 | 317 = get_reference_vars_info (y); |
|
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318 ipa_reference_global_vars_info_t y_global = &y_info->global; |
| 0 | 319 |
| 320 /* Calls in current cycle do not have global computed yet. */ | |
|
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321 if (!y_global->statics_read) |
| 0 | 322 continue; |
|
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323 |
|
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324 /* If function is declared const, it reads no memory even if it |
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325 seems so to local analysis. */ |
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326 if (flags & ECF_CONST) |
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327 continue; |
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328 |
| 0 | 329 if (x_global->statics_read |
| 330 != all_module_statics) | |
| 331 { | |
|
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332 if (y_global->statics_read |
| 0 | 333 == all_module_statics) |
| 334 { | |
| 335 BITMAP_FREE (x_global->statics_read); | |
|
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336 x_global->statics_read |
| 0 | 337 = all_module_statics; |
| 338 } | |
| 339 /* Skip bitmaps that are pointer equal to node's bitmap | |
| 340 (no reason to spin within the cycle). */ | |
|
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341 else if (x_global->statics_read |
| 0 | 342 != y_global->statics_read) |
| 343 bitmap_ior_into (x_global->statics_read, | |
| 344 y_global->statics_read); | |
| 345 } | |
|
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346 |
|
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347 /* If function is declared pure, it has no stores even if it |
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348 seems so to local analysis; If we can not return from here, |
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349 we can safely ignore the call. */ |
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350 if ((flags & ECF_PURE) |
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351 || cgraph_edge_cannot_lead_to_return (e)) |
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352 continue; |
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353 |
|
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354 if (x_global->statics_written |
| 0 | 355 != all_module_statics) |
| 356 { | |
|
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357 if (y_global->statics_written |
| 0 | 358 == all_module_statics) |
| 359 { | |
| 360 BITMAP_FREE (x_global->statics_written); | |
|
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361 x_global->statics_written |
| 0 | 362 = all_module_statics; |
| 363 } | |
| 364 /* Skip bitmaps that are pointer equal to node's bitmap | |
| 365 (no reason to spin within the cycle). */ | |
|
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366 else if (x_global->statics_written |
| 0 | 367 != y_global->statics_written) |
| 368 bitmap_ior_into (x_global->statics_written, | |
| 369 y_global->statics_written); | |
| 370 } | |
| 371 } | |
|
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372 else |
| 0 | 373 gcc_unreachable (); |
| 374 } | |
| 375 } | |
| 376 } | |
| 377 | |
| 378 /* The init routine for analyzing global static variable usage. See | |
| 379 comments at top for description. */ | |
|
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380 static void |
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381 ipa_init (void) |
| 0 | 382 { |
|
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383 static bool init_p = false; |
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384 |
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385 if (init_p) |
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386 return; |
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387 |
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388 init_p = true; |
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389 |
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390 if (dump_file) |
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391 reference_vars_to_consider = splay_tree_new (splay_tree_compare_ints, 0, 0); |
| 0 | 392 |
| 393 bitmap_obstack_initialize (&local_info_obstack); | |
|
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394 bitmap_obstack_initialize (&optimization_summary_obstack); |
|
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395 all_module_statics = BITMAP_ALLOC (&optimization_summary_obstack); |
| 0 | 396 |
|
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397 node_removal_hook_holder = |
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398 cgraph_add_node_removal_hook (&remove_node_data, NULL); |
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399 node_duplication_hook_holder = |
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400 cgraph_add_node_duplication_hook (&duplicate_node_data, NULL); |
| 0 | 401 } |
| 402 | |
|
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403 |
| 0 | 404 /* Set up the persistent info for FN. */ |
| 405 | |
| 406 static ipa_reference_local_vars_info_t | |
| 407 init_function_info (struct cgraph_node *fn) | |
| 408 { | |
|
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409 ipa_reference_vars_info_t info |
| 0 | 410 = XCNEW (struct ipa_reference_vars_info_d); |
| 411 | |
| 412 /* Add the info to the tree's annotation. */ | |
| 413 set_reference_vars_info (fn, info); | |
| 414 | |
|
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415 info->local.statics_read = BITMAP_ALLOC (&local_info_obstack); |
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416 info->local.statics_written = BITMAP_ALLOC (&local_info_obstack); |
| 0 | 417 |
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418 return &info->local; |
| 0 | 419 } |
| 420 | |
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421 |
| 0 | 422 /* This is the main routine for finding the reference patterns for |
| 423 global variables within a function FN. */ | |
|
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424 |
| 0 | 425 static void |
| 426 analyze_function (struct cgraph_node *fn) | |
| 427 { | |
|
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428 ipa_reference_local_vars_info_t local; |
|
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429 struct ipa_ref *ref; |
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430 int i; |
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431 tree var; |
| 0 | 432 |
|
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433 local = init_function_info (fn); |
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434 for (i = 0; ipa_ref_list_reference_iterate (&fn->ref_list, i, ref); i++) |
| 0 | 435 { |
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436 if (ref->refered_type != IPA_REF_VARPOOL) |
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437 continue; |
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438 var = ipa_ref_varpool_node (ref)->decl; |
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439 if (ipa_ref_varpool_node (ref)->externally_visible |
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440 || !ipa_ref_varpool_node (ref)->analyzed |
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441 || !is_proper_for_analysis (var)) |
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442 continue; |
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443 switch (ref->use) |
| 0 | 444 { |
|
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445 case IPA_REF_LOAD: |
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446 bitmap_set_bit (local->statics_read, DECL_UID (var)); |
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447 break; |
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448 case IPA_REF_STORE: |
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449 if (ipa_ref_cannot_lead_to_return (ref)) |
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450 break; |
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451 bitmap_set_bit (local->statics_written, DECL_UID (var)); |
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452 break; |
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453 case IPA_REF_ADDR: |
|
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454 gcc_unreachable (); |
|
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455 break; |
| 0 | 456 } |
| 457 } | |
| 458 | |
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459 if (cgraph_node_cannot_return (fn)) |
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460 bitmap_clear (local->statics_written); |
| 0 | 461 } |
| 462 | |
| 463 static bitmap | |
| 464 copy_global_bitmap (bitmap src) | |
| 465 { | |
| 466 bitmap dst; | |
| 467 if (!src) | |
| 468 return NULL; | |
|
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469 if (src == all_module_statics) |
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470 return all_module_statics; |
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471 dst = BITMAP_ALLOC (&optimization_summary_obstack); |
| 0 | 472 bitmap_copy (dst, src); |
| 473 return dst; | |
| 474 } | |
| 475 | |
|
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476 |
| 0 | 477 /* Called when new clone is inserted to callgraph late. */ |
| 478 | |
| 479 static void | |
| 480 duplicate_node_data (struct cgraph_node *src, struct cgraph_node *dst, | |
| 481 void *data ATTRIBUTE_UNUSED) | |
| 482 { | |
|
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483 ipa_reference_optimization_summary_t ginfo; |
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484 ipa_reference_optimization_summary_t dst_ginfo; |
| 0 | 485 |
|
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486 ginfo = get_reference_optimization_summary (src); |
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487 if (!ginfo) |
| 0 | 488 return; |
|
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489 dst_ginfo = XCNEW (struct ipa_reference_optimization_summary_d); |
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490 set_reference_optimization_summary (dst, dst_ginfo); |
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491 dst_ginfo->statics_not_read = copy_global_bitmap (ginfo->statics_not_read); |
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492 dst_ginfo->statics_not_written = copy_global_bitmap (ginfo->statics_not_written); |
| 0 | 493 } |
| 494 | |
| 495 /* Called when node is removed. */ | |
| 496 | |
| 497 static void | |
| 498 remove_node_data (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED) | |
| 499 { | |
|
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500 ipa_reference_optimization_summary_t ginfo; |
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501 ginfo = get_reference_optimization_summary (node); |
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502 if (ginfo) |
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503 { |
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504 if (ginfo->statics_not_read |
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505 && ginfo->statics_not_read != all_module_statics) |
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506 BITMAP_FREE (ginfo->statics_not_read); |
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507 |
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508 if (ginfo->statics_not_written |
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509 && ginfo->statics_not_written != all_module_statics) |
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510 BITMAP_FREE (ginfo->statics_not_written); |
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511 free (ginfo); |
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512 set_reference_optimization_summary (node, NULL); |
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513 } |
| 0 | 514 } |
| 515 | |
| 516 /* Analyze each function in the cgraph to see which global or statics | |
| 517 are read or written. */ | |
| 518 | |
|
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519 static void |
| 0 | 520 generate_summary (void) |
| 521 { | |
| 522 struct cgraph_node *node; | |
| 523 unsigned int index; | |
| 524 bitmap_iterator bi; | |
| 525 bitmap bm_temp; | |
|
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526 |
| 0 | 527 ipa_init (); |
| 528 bm_temp = BITMAP_ALLOC (&local_info_obstack); | |
| 529 | |
|
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530 /* Process all of the functions next. */ |
| 0 | 531 for (node = cgraph_nodes; node; node = node->next) |
|
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532 if (node->analyzed) |
| 0 | 533 analyze_function (node); |
| 534 | |
| 535 if (dump_file) | |
| 536 EXECUTE_IF_SET_IN_BITMAP (all_module_statics, 0, index, bi) | |
| 537 { | |
| 538 fprintf (dump_file, "\nPromotable global:%s", | |
| 539 get_static_name (index)); | |
| 540 } | |
|
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541 |
| 0 | 542 BITMAP_FREE(bm_temp); |
|
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543 |
| 0 | 544 if (dump_file) |
| 545 for (node = cgraph_nodes; node; node = node->next) | |
| 546 if (cgraph_function_body_availability (node) >= AVAIL_OVERWRITABLE) | |
| 547 { | |
| 548 ipa_reference_local_vars_info_t l; | |
| 549 unsigned int index; | |
| 550 bitmap_iterator bi; | |
|
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551 |
|
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552 l = &get_reference_vars_info (node)->local; |
|
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553 fprintf (dump_file, |
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554 "\nFunction name:%s/%i:", |
| 0 | 555 cgraph_node_name (node), node->uid); |
| 556 fprintf (dump_file, "\n locals read: "); | |
|
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557 if (l->statics_read) |
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558 EXECUTE_IF_SET_IN_BITMAP (l->statics_read, |
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559 0, index, bi) |
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560 { |
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561 fprintf (dump_file, "%s ", |
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562 get_static_name (index)); |
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563 } |
| 0 | 564 fprintf (dump_file, "\n locals written: "); |
|
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565 if (l->statics_written) |
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566 EXECUTE_IF_SET_IN_BITMAP (l->statics_written, |
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567 0, index, bi) |
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568 { |
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569 fprintf(dump_file, "%s ", |
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570 get_static_name (index)); |
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571 } |
| 0 | 572 } |
| 573 } | |
| 574 | |
|
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575 /* Set READ_ALL/WRITE_ALL based on decl flags of NODE. */ |
|
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576 |
|
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577 static void |
|
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578 read_write_all_from_decl (struct cgraph_node *node, bool * read_all, |
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579 bool * write_all) |
|
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580 { |
|
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581 tree decl = node->decl; |
|
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582 int flags = flags_from_decl_or_type (decl); |
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583 if ((flags & ECF_LEAF) |
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584 && cgraph_function_body_availability (node) <= AVAIL_OVERWRITABLE) |
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585 ; |
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586 else if (flags & ECF_CONST) |
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587 ; |
|
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588 else if ((flags & ECF_PURE) |
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589 || cgraph_node_cannot_return (node)) |
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590 { |
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591 *read_all = true; |
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592 if (dump_file && (dump_flags & TDF_DETAILS)) |
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593 fprintf (dump_file, " %s/%i -> read all\n", |
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594 cgraph_node_name (node), node->uid); |
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595 } |
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596 else |
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597 { |
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598 /* TODO: To be able to produce sane results, we should also handle |
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599 common builtins, in particular throw. */ |
|
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600 *read_all = true; |
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601 *write_all = true; |
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602 if (dump_file && (dump_flags & TDF_DETAILS)) |
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603 fprintf (dump_file, " %s/%i -> read all, write all\n", |
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604 cgraph_node_name (node), node->uid); |
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605 } |
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606 } |
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607 |
| 0 | 608 /* Produce the global information by preforming a transitive closure |
|
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609 on the local information that was produced by ipa_analyze_function */ |
| 0 | 610 |
| 611 static unsigned int | |
| 612 propagate (void) | |
| 613 { | |
| 614 struct cgraph_node *node; | |
| 615 struct cgraph_node *w; | |
| 616 struct cgraph_node **order = | |
| 617 XCNEWVEC (struct cgraph_node *, cgraph_n_nodes); | |
|
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618 int order_pos = ipa_utils_reduced_inorder (order, false, true, NULL); |
| 0 | 619 int i; |
| 620 | |
|
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621 if (dump_file) |
| 0 | 622 dump_cgraph (dump_file); |
| 623 | |
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624 ipa_discover_readonly_nonaddressable_vars (); |
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625 generate_summary (); |
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626 |
| 0 | 627 /* Propagate the local information thru the call graph to produce |
| 628 the global information. All the nodes within a cycle will have | |
| 629 the same info so we collapse cycles first. Then we can do the | |
| 630 propagation in one pass from the leaves to the roots. */ | |
|
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631 order_pos = ipa_utils_reduced_inorder (order, true, true, NULL); |
| 0 | 632 if (dump_file) |
| 633 ipa_utils_print_order(dump_file, "reduced", order, order_pos); | |
| 634 | |
| 635 for (i = 0; i < order_pos; i++ ) | |
| 636 { | |
| 637 ipa_reference_vars_info_t node_info; | |
|
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638 ipa_reference_global_vars_info_t node_g; |
| 0 | 639 ipa_reference_local_vars_info_t node_l; |
|
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640 struct cgraph_edge *e, *ie; |
|
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641 |
| 0 | 642 bool read_all; |
| 643 bool write_all; | |
| 644 struct ipa_dfs_info * w_info; | |
| 645 | |
| 646 node = order[i]; | |
| 647 node_info = get_reference_vars_info (node); | |
|
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648 gcc_assert (node_info); |
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649 |
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650 |
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651 if (dump_file && (dump_flags & TDF_DETAILS)) |
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652 fprintf (dump_file, "Starting cycle with %s/%i\n", |
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653 cgraph_node_name (node), node->uid); |
| 0 | 654 |
|
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655 node_l = &node_info->local; |
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656 node_g = &node_info->global; |
| 0 | 657 |
|
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658 read_all = false; |
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659 write_all = false; |
| 0 | 660 |
|
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661 /* When function is overwritable, we can not assume anything. */ |
|
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662 if (cgraph_function_body_availability (node) <= AVAIL_OVERWRITABLE) |
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663 read_write_all_from_decl (node, &read_all, &write_all); |
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664 |
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665 for (e = node->callees; e; e = e->next_callee) |
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666 if (cgraph_function_body_availability (e->callee) <= AVAIL_OVERWRITABLE) |
|
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667 read_write_all_from_decl (e->callee, &read_all, &write_all); |
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668 |
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669 for (ie = node->indirect_calls; ie; ie = ie->next_callee) |
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670 if (!(ie->indirect_info->ecf_flags & ECF_CONST)) |
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671 { |
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672 read_all = true; |
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673 if (dump_file && (dump_flags & TDF_DETAILS)) |
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674 fprintf (dump_file, " indirect call -> read all\n"); |
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675 if (!cgraph_edge_cannot_lead_to_return (ie) |
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676 && !(ie->indirect_info->ecf_flags & ECF_PURE)) |
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677 { |
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678 if (dump_file && (dump_flags & TDF_DETAILS)) |
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679 fprintf (dump_file, " indirect call -> write all\n"); |
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680 write_all = true; |
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681 } |
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682 } |
|
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683 |
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684 |
|
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685 /* If any node in a cycle is read_all or write_all |
| 0 | 686 they all are. */ |
| 687 w_info = (struct ipa_dfs_info *) node->aux; | |
| 688 w = w_info->next_cycle; | |
|
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689 while (w && (!read_all || !write_all)) |
| 0 | 690 { |
|
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691 if (dump_file && (dump_flags & TDF_DETAILS)) |
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692 fprintf (dump_file, " Visiting %s/%i\n", |
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693 cgraph_node_name (w), w->uid); |
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694 /* When function is overwritable, we can not assume anything. */ |
|
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695 if (cgraph_function_body_availability (w) <= AVAIL_OVERWRITABLE) |
|
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696 read_write_all_from_decl (w, &read_all, &write_all); |
|
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697 |
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698 for (e = w->callees; e; e = e->next_callee) |
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699 if (cgraph_function_body_availability (e->callee) <= AVAIL_OVERWRITABLE) |
|
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700 read_write_all_from_decl (e->callee, &read_all, &write_all); |
|
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701 |
|
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702 for (ie = w->indirect_calls; ie; ie = ie->next_callee) |
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703 if (!(ie->indirect_info->ecf_flags & ECF_CONST)) |
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704 { |
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705 read_all = true; |
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706 if (dump_file && (dump_flags & TDF_DETAILS)) |
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707 fprintf (dump_file, " indirect call -> read all\n"); |
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708 if (!cgraph_edge_cannot_lead_to_return (ie) |
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709 && !(ie->indirect_info->ecf_flags & ECF_PURE)) |
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710 { |
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711 write_all = true; |
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712 if (dump_file && (dump_flags & TDF_DETAILS)) |
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713 fprintf (dump_file, " indirect call -> write all\n"); |
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714 } |
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715 } |
| 0 | 716 |
| 717 w_info = (struct ipa_dfs_info *) w->aux; | |
| 718 w = w_info->next_cycle; | |
| 719 } | |
| 720 | |
|
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721 |
| 0 | 722 /* Initialized the bitmaps for the reduced nodes */ |
|
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723 if (read_all) |
| 0 | 724 node_g->statics_read = all_module_statics; |
|
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725 else |
| 0 | 726 { |
|
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727 node_g->statics_read = BITMAP_ALLOC (&local_info_obstack); |
|
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728 bitmap_copy (node_g->statics_read, |
| 0 | 729 node_l->statics_read); |
| 730 } | |
|
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731 if (write_all) |
| 0 | 732 node_g->statics_written = all_module_statics; |
| 733 else | |
| 734 { | |
|
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735 node_g->statics_written = BITMAP_ALLOC (&local_info_obstack); |
|
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736 bitmap_copy (node_g->statics_written, |
| 0 | 737 node_l->statics_written); |
| 738 } | |
| 739 | |
| 740 propagate_bits (node_g, node); | |
| 741 w_info = (struct ipa_dfs_info *) node->aux; | |
| 742 w = w_info->next_cycle; | |
|
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743 while (w && (!read_all || !write_all)) |
| 0 | 744 { |
|
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745 ipa_reference_vars_info_t w_ri = |
| 0 | 746 get_reference_vars_info (w); |
|
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747 ipa_reference_local_vars_info_t w_l = &w_ri->local; |
|
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748 int flags = flags_from_decl_or_type (w->decl); |
|
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749 |
| 0 | 750 /* These global bitmaps are initialized from the local info |
| 751 of all of the nodes in the region. However there is no | |
| 752 need to do any work if the bitmaps were set to | |
| 753 all_module_statics. */ | |
|
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754 if (!read_all && !(flags & ECF_CONST)) |
| 0 | 755 bitmap_ior_into (node_g->statics_read, |
| 756 w_l->statics_read); | |
|
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757 if (!write_all |
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758 && !(flags & ECF_PURE) |
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759 && !cgraph_node_cannot_return (w)) |
| 0 | 760 bitmap_ior_into (node_g->statics_written, |
| 761 w_l->statics_written); | |
| 762 propagate_bits (node_g, w); | |
| 763 w_info = (struct ipa_dfs_info *) w->aux; | |
| 764 w = w_info->next_cycle; | |
| 765 } | |
| 766 | |
| 767 /* All nodes within a cycle have the same global info bitmaps. */ | |
|
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768 node_info->global = *node_g; |
| 0 | 769 w_info = (struct ipa_dfs_info *) node->aux; |
| 770 w = w_info->next_cycle; | |
| 771 while (w) | |
| 772 { | |
|
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773 ipa_reference_vars_info_t w_ri = |
| 0 | 774 get_reference_vars_info (w); |
| 775 | |
|
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776 w_ri->global = *node_g; |
| 0 | 777 |
| 778 w_info = (struct ipa_dfs_info *) w->aux; | |
| 779 w = w_info->next_cycle; | |
| 780 } | |
| 781 } | |
| 782 | |
| 783 if (dump_file) | |
| 784 { | |
| 785 for (i = 0; i < order_pos; i++ ) | |
| 786 { | |
| 787 ipa_reference_vars_info_t node_info; | |
| 788 ipa_reference_global_vars_info_t node_g; | |
| 789 ipa_reference_local_vars_info_t node_l; | |
| 790 unsigned int index; | |
| 791 bitmap_iterator bi; | |
| 792 struct ipa_dfs_info * w_info; | |
| 793 | |
| 794 node = order[i]; | |
| 795 node_info = get_reference_vars_info (node); | |
|
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796 node_g = &node_info->global; |
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797 node_l = &node_info->local; |
|
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798 fprintf (dump_file, |
|
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799 "\nFunction name:%s/%i:", |
| 0 | 800 cgraph_node_name (node), node->uid); |
| 801 fprintf (dump_file, "\n locals read: "); | |
|
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802 if (node_l->statics_read) |
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803 EXECUTE_IF_SET_IN_BITMAP (node_l->statics_read, |
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804 0, index, bi) |
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805 { |
|
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806 fprintf (dump_file, "%s ", |
|
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807 get_static_name (index)); |
|
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808 } |
| 0 | 809 fprintf (dump_file, "\n locals written: "); |
|
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810 if (node_l->statics_written) |
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|
811 EXECUTE_IF_SET_IN_BITMAP (node_l->statics_written, |
|
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|
812 0, index, bi) |
|
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|
813 { |
|
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|
814 fprintf(dump_file, "%s ", |
|
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815 get_static_name (index)); |
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816 } |
| 0 | 817 |
| 818 w_info = (struct ipa_dfs_info *) node->aux; | |
| 819 w = w_info->next_cycle; | |
|
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|
820 while (w) |
| 0 | 821 { |
|
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822 ipa_reference_vars_info_t w_ri = |
| 0 | 823 get_reference_vars_info (w); |
|
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824 ipa_reference_local_vars_info_t w_l = &w_ri->local; |
| 0 | 825 fprintf (dump_file, "\n next cycle: %s/%i ", |
| 826 cgraph_node_name (w), w->uid); | |
|
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827 fprintf (dump_file, "\n locals read: "); |
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828 if (w_l->statics_read) |
|
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829 EXECUTE_IF_SET_IN_BITMAP (w_l->statics_read, |
|
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|
830 0, index, bi) |
|
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|
831 { |
|
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832 fprintf (dump_file, "%s ", |
|
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|
833 get_static_name (index)); |
|
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834 } |
| 0 | 835 |
| 836 fprintf (dump_file, "\n locals written: "); | |
|
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|
837 if (w_l->statics_written) |
|
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|
838 EXECUTE_IF_SET_IN_BITMAP (w_l->statics_written, |
|
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|
839 0, index, bi) |
|
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|
840 { |
|
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|
841 fprintf (dump_file, "%s ", |
|
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parents:
0
diff
changeset
|
842 get_static_name (index)); |
|
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update it from 4.4.3 to 4.5.0
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parents:
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diff
changeset
|
843 } |
| 0 | 844 |
| 845 w_info = (struct ipa_dfs_info *) w->aux; | |
| 846 w = w_info->next_cycle; | |
| 847 } | |
| 848 fprintf (dump_file, "\n globals read: "); | |
|
55
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parents:
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diff
changeset
|
849 if (node_g->statics_read == all_module_statics) |
|
77e2b8dfacca
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parents:
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diff
changeset
|
850 fprintf (dump_file, "ALL"); |
|
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
851 else |
|
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parents:
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diff
changeset
|
852 EXECUTE_IF_SET_IN_BITMAP (node_g->statics_read, |
|
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parents:
0
diff
changeset
|
853 0, index, bi) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
854 { |
|
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parents:
0
diff
changeset
|
855 fprintf (dump_file, "%s ", |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
856 get_static_name (index)); |
|
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parents:
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diff
changeset
|
857 } |
| 0 | 858 fprintf (dump_file, "\n globals written: "); |
|
55
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parents:
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diff
changeset
|
859 if (node_g->statics_written == all_module_statics) |
|
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parents:
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diff
changeset
|
860 fprintf (dump_file, "ALL"); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
861 else |
|
77e2b8dfacca
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parents:
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diff
changeset
|
862 EXECUTE_IF_SET_IN_BITMAP (node_g->statics_written, |
|
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parents:
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diff
changeset
|
863 0, index, bi) |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
864 { |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
865 fprintf (dump_file, "%s ", |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
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diff
changeset
|
866 get_static_name (index)); |
|
77e2b8dfacca
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parents:
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diff
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|
867 } |
| 0 | 868 } |
| 869 } | |
| 870 | |
| 871 /* Cleanup. */ | |
|
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diff
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|
872 for (node = cgraph_nodes; node; node = node->next) |
| 0 | 873 { |
| 874 ipa_reference_vars_info_t node_info; | |
| 875 ipa_reference_global_vars_info_t node_g; | |
|
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parents:
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diff
changeset
|
876 ipa_reference_optimization_summary_t opt; |
|
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diff
changeset
|
877 |
|
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parents:
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diff
changeset
|
878 if (!node->analyzed) |
|
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parents:
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diff
changeset
|
879 continue; |
|
55
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parents:
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diff
changeset
|
880 |
|
63
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parents:
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diff
changeset
|
881 node_info = get_reference_vars_info (node); |
|
67
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diff
changeset
|
882 if (cgraph_function_body_availability (node) > AVAIL_OVERWRITABLE |
|
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diff
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|
883 || (flags_from_decl_or_type (node->decl) & ECF_LEAF)) |
|
63
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
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diff
changeset
|
884 { |
|
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parents:
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diff
changeset
|
885 node_g = &node_info->global; |
| 0 | 886 |
|
63
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diff
changeset
|
887 opt = XCNEW (struct ipa_reference_optimization_summary_d); |
|
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parents:
55
diff
changeset
|
888 set_reference_optimization_summary (node, opt); |
| 0 | 889 |
|
63
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
890 /* Create the complimentary sets. */ |
|
b7f97abdc517
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parents:
55
diff
changeset
|
891 |
|
67
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
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|
892 if (bitmap_empty_p (node_g->statics_read)) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
893 opt->statics_not_read = all_module_statics; |
|
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diff
changeset
|
894 else |
|
f6334be47118
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63
diff
changeset
|
895 { |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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63
diff
changeset
|
896 opt->statics_not_read |
|
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diff
changeset
|
897 = BITMAP_ALLOC (&optimization_summary_obstack); |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
898 if (node_g->statics_read != all_module_statics) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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63
diff
changeset
|
899 bitmap_and_compl (opt->statics_not_read, |
|
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diff
changeset
|
900 all_module_statics, |
|
f6334be47118
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parents:
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diff
changeset
|
901 node_g->statics_read); |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
902 } |
| 0 | 903 |
|
67
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
904 if (bitmap_empty_p (node_g->statics_written)) |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
905 opt->statics_not_written = all_module_statics; |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
906 else |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
907 { |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
908 opt->statics_not_written |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
909 = BITMAP_ALLOC (&optimization_summary_obstack); |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
910 if (node_g->statics_written != all_module_statics) |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
911 bitmap_and_compl (opt->statics_not_written, |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
912 all_module_statics, |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
913 node_g->statics_written); |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
914 } |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
915 } |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
916 if (node_info) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
917 free (node_info); |
| 0 | 918 if (node->aux) |
| 919 { | |
| 920 free (node->aux); | |
| 921 node->aux = NULL; | |
| 922 } | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
923 } |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
924 |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
925 free (order); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
926 |
| 0 | 927 bitmap_obstack_release (&local_info_obstack); |
|
63
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update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
928 VEC_free (ipa_reference_vars_info_t, heap, ipa_reference_vars_vector); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
929 ipa_reference_vars_vector = NULL; |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
930 if (dump_file) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
931 splay_tree_delete (reference_vars_to_consider); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
932 reference_vars_to_consider = NULL; |
| 0 | 933 return 0; |
| 934 } | |
| 935 | |
|
63
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
936 /* Return true if we need to write summary of NODE. */ |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
937 |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
938 static bool |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
939 write_node_summary_p (struct cgraph_node *node, |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
940 cgraph_node_set set, |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
941 varpool_node_set vset, |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
942 bitmap ltrans_statics) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
943 { |
|
b7f97abdc517
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parents:
55
diff
changeset
|
944 ipa_reference_optimization_summary_t info; |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
945 |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
946 /* See if we have (non-empty) info. */ |
|
b7f97abdc517
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parents:
55
diff
changeset
|
947 if (!node->analyzed || node->global.inlined_to) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
948 return false; |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
949 info = get_reference_optimization_summary (node); |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
950 if (!info || (bitmap_empty_p (info->statics_not_read) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
951 && bitmap_empty_p (info->statics_not_written))) |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
952 return false; |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
953 |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
954 /* See if we want to encode it. |
|
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
955 Encode also referenced functions since constant folding might turn it into |
|
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update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
956 a direct call. |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
957 |
|
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update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
958 In future we might also want to include summaries of functions references |
|
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update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
959 by initializers of constant variables references in current unit. */ |
|
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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parents:
55
diff
changeset
|
960 if (!reachable_from_this_partition_p (node, set) |
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961 && !referenced_from_this_partition_p (&node->ref_list, set, vset)) |
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962 return false; |
|
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|
963 |
|
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964 /* See if the info has non-empty intersections with vars we want to encode. */ |
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965 if (!bitmap_intersect_p (info->statics_not_read, ltrans_statics) |
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966 && !bitmap_intersect_p (info->statics_not_written, ltrans_statics)) |
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967 return false; |
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968 return true; |
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969 } |
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970 |
|
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971 /* Stream out BITS<RANS_STATICS as list of decls to OB. |
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972 LTRANS_STATICS_BITCOUNT specify number of bits in LTRANS_STATICS |
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973 or -1. When it is positive, just output -1 when |
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974 BITS<RANS_STATICS == BITS<RANS_STATICS. */ |
|
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975 |
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976 static void |
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977 stream_out_bitmap (struct lto_simple_output_block *ob, |
|
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978 bitmap bits, bitmap ltrans_statics, |
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979 int ltrans_statics_bitcount) |
|
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980 { |
|
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981 int count = 0; |
|
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982 unsigned int index; |
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983 bitmap_iterator bi; |
|
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984 if (bits == all_module_statics) |
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985 { |
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986 lto_output_sleb128_stream (ob->main_stream, -1); |
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987 return; |
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988 } |
|
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989 EXECUTE_IF_AND_IN_BITMAP (bits, ltrans_statics, 0, index, bi) |
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990 count ++; |
|
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991 if (count == ltrans_statics_bitcount) |
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992 { |
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993 lto_output_sleb128_stream (ob->main_stream, -1); |
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994 return; |
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995 } |
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996 lto_output_sleb128_stream (ob->main_stream, count); |
|
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997 if (!count) |
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998 return; |
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999 EXECUTE_IF_AND_IN_BITMAP (bits, ltrans_statics, 0, index, bi) |
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1000 { |
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1001 tree decl = (tree)splay_tree_lookup (reference_vars_to_consider, index)->value; |
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1002 lto_output_var_decl_index(ob->decl_state, ob->main_stream, decl); |
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1003 } |
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1004 } |
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1005 |
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1006 /* Serialize the ipa info for lto. */ |
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1007 |
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1008 static void |
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1009 ipa_reference_write_optimization_summary (cgraph_node_set set, |
|
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1010 varpool_node_set vset) |
|
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1011 { |
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1012 struct cgraph_node *node; |
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1013 struct lto_simple_output_block *ob |
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1014 = lto_create_simple_output_block (LTO_section_ipa_reference); |
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1015 unsigned int count = 0; |
|
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1016 int ltrans_statics_bitcount = 0; |
|
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1017 lto_cgraph_encoder_t encoder = ob->decl_state->cgraph_node_encoder; |
|
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1018 lto_varpool_encoder_t varpool_encoder = ob->decl_state->varpool_node_encoder; |
|
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1019 bitmap ltrans_statics = BITMAP_ALLOC (NULL); |
|
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1020 int i; |
|
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1021 |
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1022 reference_vars_to_consider = splay_tree_new (splay_tree_compare_ints, 0, 0); |
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1023 |
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1024 /* See what variables we are interested in. */ |
|
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1025 for (i = 0; i < lto_varpool_encoder_size (varpool_encoder); i++) |
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1026 { |
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1027 struct varpool_node *vnode = lto_varpool_encoder_deref (varpool_encoder, i); |
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1028 if (!vnode->externally_visible |
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1029 && vnode->analyzed |
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1030 && bitmap_bit_p (all_module_statics, DECL_UID (vnode->decl)) |
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1031 && referenced_from_this_partition_p (&vnode->ref_list, set, vset)) |
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|
1032 { |
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1033 tree decl = vnode->decl; |
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1034 bitmap_set_bit (ltrans_statics, DECL_UID (decl)); |
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|
1035 splay_tree_insert (reference_vars_to_consider, |
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1036 DECL_UID (decl), (splay_tree_value)decl); |
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1037 ltrans_statics_bitcount ++; |
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|
1038 } |
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|
1039 } |
|
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|
1040 |
|
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|
1041 |
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|
1042 if (ltrans_statics_bitcount) |
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|
1043 for (i = 0; i < lto_cgraph_encoder_size (encoder); i++) |
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|
1044 if (write_node_summary_p (lto_cgraph_encoder_deref (encoder, i), |
|
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1045 set, vset, ltrans_statics)) |
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|
1046 count++; |
|
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|
1047 |
|
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1048 lto_output_uleb128_stream (ob->main_stream, count); |
|
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|
1049 if (count) |
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1050 stream_out_bitmap (ob, ltrans_statics, ltrans_statics, |
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1051 -1); |
|
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|
1052 |
|
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1053 /* Process all of the functions. */ |
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1054 if (ltrans_statics_bitcount) |
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1055 for (i = 0; i < lto_cgraph_encoder_size (encoder); i++) |
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1056 { |
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1057 node = lto_cgraph_encoder_deref (encoder, i); |
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1058 if (write_node_summary_p (node, set, vset, ltrans_statics)) |
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1059 { |
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1060 ipa_reference_optimization_summary_t info; |
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1061 int node_ref; |
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1062 |
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1063 info = get_reference_optimization_summary (node); |
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1064 node_ref = lto_cgraph_encoder_encode (encoder, node); |
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1065 lto_output_uleb128_stream (ob->main_stream, node_ref); |
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1066 |
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1067 stream_out_bitmap (ob, info->statics_not_read, ltrans_statics, |
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1068 ltrans_statics_bitcount); |
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1069 stream_out_bitmap (ob, info->statics_not_written, ltrans_statics, |
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1070 ltrans_statics_bitcount); |
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1071 } |
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1072 } |
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1073 BITMAP_FREE (ltrans_statics); |
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1074 lto_destroy_simple_output_block (ob); |
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1075 splay_tree_delete (reference_vars_to_consider); |
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1076 } |
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1077 |
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1078 /* Deserialize the ipa info for lto. */ |
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1079 |
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1080 static void |
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1081 ipa_reference_read_optimization_summary (void) |
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1082 { |
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1083 struct lto_file_decl_data ** file_data_vec |
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1084 = lto_get_file_decl_data (); |
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1085 struct lto_file_decl_data * file_data; |
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1086 unsigned int j = 0; |
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1087 bitmap_obstack_initialize (&optimization_summary_obstack); |
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1088 |
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1089 node_removal_hook_holder = |
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1090 cgraph_add_node_removal_hook (&remove_node_data, NULL); |
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1091 node_duplication_hook_holder = |
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1092 cgraph_add_node_duplication_hook (&duplicate_node_data, NULL); |
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1093 all_module_statics = BITMAP_ALLOC (&optimization_summary_obstack); |
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1094 |
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1095 while ((file_data = file_data_vec[j++])) |
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1096 { |
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1097 const char *data; |
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1098 size_t len; |
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1099 struct lto_input_block *ib |
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1100 = lto_create_simple_input_block (file_data, |
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1101 LTO_section_ipa_reference, |
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1102 &data, &len); |
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1103 if (ib) |
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1104 { |
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1105 unsigned int i; |
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1106 unsigned int f_count = lto_input_uleb128 (ib); |
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1107 int b_count; |
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1108 if (!f_count) |
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1109 continue; |
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1110 b_count = lto_input_sleb128 (ib); |
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1111 if (dump_file) |
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1112 fprintf (dump_file, "all module statics:"); |
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1113 for (i = 0; i < (unsigned int)b_count; i++) |
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1114 { |
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1115 unsigned int var_index = lto_input_uleb128 (ib); |
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1116 tree v_decl = lto_file_decl_data_get_var_decl (file_data, |
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1117 var_index); |
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1118 bitmap_set_bit (all_module_statics, DECL_UID (v_decl)); |
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1119 if (dump_file) |
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1120 fprintf (dump_file, " %s", |
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1121 lang_hooks.decl_printable_name (v_decl, 2)); |
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1122 } |
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1123 |
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1124 for (i = 0; i < f_count; i++) |
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1125 { |
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1126 unsigned int j, index; |
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1127 struct cgraph_node *node; |
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1128 ipa_reference_optimization_summary_t info; |
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1129 int v_count; |
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1130 lto_cgraph_encoder_t encoder; |
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1131 |
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1132 index = lto_input_uleb128 (ib); |
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1133 encoder = file_data->cgraph_node_encoder; |
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1134 node = lto_cgraph_encoder_deref (encoder, index); |
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1135 info = XCNEW (struct ipa_reference_optimization_summary_d); |
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1136 set_reference_optimization_summary (node, info); |
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1137 info->statics_not_read = BITMAP_ALLOC (&optimization_summary_obstack); |
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1138 info->statics_not_written = BITMAP_ALLOC (&optimization_summary_obstack); |
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1139 if (dump_file) |
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1140 fprintf (dump_file, |
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1141 "\nFunction name:%s/%i:\n static not read:", |
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1142 cgraph_node_name (node), node->uid); |
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1143 |
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1144 /* Set the statics not read. */ |
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1145 v_count = lto_input_sleb128 (ib); |
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1146 if (v_count == -1) |
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1147 { |
|
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1148 info->statics_not_read = all_module_statics; |
|
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1149 if (dump_file) |
|
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1150 fprintf (dump_file, " all module statics"); |
|
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1151 } |
|
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1152 else |
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1153 for (j = 0; j < (unsigned int)v_count; j++) |
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1154 { |
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1155 unsigned int var_index = lto_input_uleb128 (ib); |
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1156 tree v_decl = lto_file_decl_data_get_var_decl (file_data, |
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1157 var_index); |
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1158 bitmap_set_bit (info->statics_not_read, DECL_UID (v_decl)); |
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1159 if (dump_file) |
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1160 fprintf (dump_file, " %s", |
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1161 lang_hooks.decl_printable_name (v_decl, 2)); |
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1162 } |
|
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1163 |
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1164 if (dump_file) |
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1165 fprintf (dump_file, |
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1166 "\n static not written:"); |
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1167 /* Set the statics not written. */ |
|
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1168 v_count = lto_input_sleb128 (ib); |
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1169 if (v_count == -1) |
|
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1170 { |
|
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1171 info->statics_not_written = all_module_statics; |
|
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1172 if (dump_file) |
|
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1173 fprintf (dump_file, " all module statics"); |
|
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1174 } |
|
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1175 else |
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1176 for (j = 0; j < (unsigned int)v_count; j++) |
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1177 { |
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1178 unsigned int var_index = lto_input_uleb128 (ib); |
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1179 tree v_decl = lto_file_decl_data_get_var_decl (file_data, |
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1180 var_index); |
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1181 bitmap_set_bit (info->statics_not_written, DECL_UID (v_decl)); |
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1182 if (dump_file) |
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1183 fprintf (dump_file, " %s", |
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1184 lang_hooks.decl_printable_name (v_decl, 2)); |
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1185 } |
|
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1186 if (dump_file) |
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1187 fprintf (dump_file, "\n"); |
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1188 } |
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1189 |
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1190 lto_destroy_simple_input_block (file_data, |
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1191 LTO_section_ipa_reference, |
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1192 ib, data, len); |
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1193 } |
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1194 else |
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1195 /* Fatal error here. We do not want to support compiling ltrans units with |
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1196 different version of compiler or different flags than the WPA unit, so |
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1197 this should never happen. */ |
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1198 fatal_error ("ipa reference summary is missing in ltrans unit"); |
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1199 } |
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1200 } |
| 0 | 1201 |
| 1202 static bool | |
| 1203 gate_reference (void) | |
| 1204 { | |
| 1205 return (flag_ipa_reference | |
| 1206 /* Don't bother doing anything if the program has errors. */ | |
|
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1207 && !seen_error ()); |
| 0 | 1208 } |
| 1209 | |
|
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1210 struct ipa_opt_pass_d pass_ipa_reference = |
| 0 | 1211 { |
| 1212 { | |
| 1213 IPA_PASS, | |
| 1214 "static-var", /* name */ | |
| 1215 gate_reference, /* gate */ | |
| 1216 propagate, /* execute */ | |
| 1217 NULL, /* sub */ | |
| 1218 NULL, /* next */ | |
| 1219 0, /* static_pass_number */ | |
| 1220 TV_IPA_REFERENCE, /* tv_id */ | |
| 1221 0, /* properties_required */ | |
| 1222 0, /* properties_provided */ | |
| 1223 0, /* properties_destroyed */ | |
| 1224 0, /* todo_flags_start */ | |
| 1225 0 /* todo_flags_finish */ | |
| 1226 }, | |
|
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1227 NULL, /* generate_summary */ |
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1228 NULL, /* write_summary */ |
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1229 NULL, /* read_summary */ |
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1230 ipa_reference_write_optimization_summary,/* write_optimization_summary */ |
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1231 ipa_reference_read_optimization_summary,/* read_optimization_summary */ |
|
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1232 NULL, /* stmt_fixup */ |
| 0 | 1233 0, /* TODOs */ |
| 1234 NULL, /* function_transform */ | |
| 1235 NULL /* variable_transform */ | |
| 1236 }; |