Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa.c @ 158:494b0b89df80 default tip
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| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 25 May 2020 18:13:55 +0900 |
| parents | 1830386684a0 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* Miscellaneous SSA utility functions. |
| 145 | 2 Copyright (C) 2001-2020 Free Software Foundation, Inc. |
| 0 | 3 |
| 4 This file is part of GCC. | |
| 5 | |
| 6 GCC is free software; you can redistribute it and/or modify | |
| 7 it under the terms of the GNU General Public License as published by | |
| 8 the Free Software Foundation; either version 3, or (at your option) | |
| 9 any later version. | |
| 10 | |
| 11 GCC is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 GNU General Public License for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 #include "config.h" | |
| 21 #include "system.h" | |
| 22 #include "coretypes.h" | |
| 111 | 23 #include "backend.h" |
| 0 | 24 #include "tree.h" |
| 111 | 25 #include "gimple.h" |
| 26 #include "cfghooks.h" | |
| 27 #include "tree-pass.h" | |
| 28 #include "ssa.h" | |
|
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29 #include "gimple-pretty-print.h" |
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30 #include "diagnostic-core.h" |
| 111 | 31 #include "fold-const.h" |
| 32 #include "stor-layout.h" | |
| 33 #include "gimple-fold.h" | |
| 34 #include "gimplify.h" | |
| 35 #include "gimple-iterator.h" | |
| 36 #include "gimple-walk.h" | |
| 37 #include "tree-ssa-loop-manip.h" | |
| 38 #include "tree-into-ssa.h" | |
| 39 #include "tree-ssa.h" | |
| 40 #include "cfgloop.h" | |
| 41 #include "cfgexpand.h" | |
| 42 #include "tree-cfg.h" | |
| 43 #include "tree-dfa.h" | |
| 44 #include "stringpool.h" | |
| 45 #include "attribs.h" | |
| 46 #include "asan.h" | |
| 0 | 47 |
| 48 /* Pointer map of variable mappings, keyed by edge. */ | |
| 111 | 49 static hash_map<edge, auto_vec<edge_var_map> > *edge_var_maps; |
| 0 | 50 |
| 51 | |
| 52 /* Add a mapping with PHI RESULT and PHI DEF associated with edge E. */ | |
| 53 | |
| 54 void | |
| 145 | 55 redirect_edge_var_map_add (edge e, tree result, tree def, location_t locus) |
| 0 | 56 { |
| 57 edge_var_map new_node; | |
| 58 | |
| 59 if (edge_var_maps == NULL) | |
| 111 | 60 edge_var_maps = new hash_map<edge, auto_vec<edge_var_map> >; |
| 0 | 61 |
| 111 | 62 auto_vec<edge_var_map> &slot = edge_var_maps->get_or_insert (e); |
| 0 | 63 new_node.def = def; |
| 64 new_node.result = result; | |
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65 new_node.locus = locus; |
| 0 | 66 |
| 111 | 67 slot.safe_push (new_node); |
| 0 | 68 } |
| 69 | |
| 70 | |
| 71 /* Clear the var mappings in edge E. */ | |
| 72 | |
| 73 void | |
| 74 redirect_edge_var_map_clear (edge e) | |
| 75 { | |
| 76 if (!edge_var_maps) | |
| 77 return; | |
| 78 | |
| 111 | 79 auto_vec<edge_var_map> *head = edge_var_maps->get (e); |
| 0 | 80 |
| 111 | 81 if (head) |
| 82 head->release (); | |
| 0 | 83 } |
| 84 | |
| 85 | |
| 86 /* Duplicate the redirected var mappings in OLDE in NEWE. | |
| 87 | |
| 111 | 88 This assumes a hash_map can have multiple edges mapping to the same |
| 89 var_map (many to one mapping), since we don't remove the previous mappings. | |
| 90 */ | |
| 0 | 91 |
| 92 void | |
| 93 redirect_edge_var_map_dup (edge newe, edge olde) | |
| 94 { | |
| 95 if (!edge_var_maps) | |
| 96 return; | |
| 97 | |
| 111 | 98 auto_vec<edge_var_map> *new_head = &edge_var_maps->get_or_insert (newe); |
| 99 auto_vec<edge_var_map> *old_head = edge_var_maps->get (olde); | |
| 100 if (!old_head) | |
| 0 | 101 return; |
| 102 | |
| 111 | 103 new_head->safe_splice (*old_head); |
| 0 | 104 } |
| 105 | |
| 106 | |
| 107 /* Return the variable mappings for a given edge. If there is none, return | |
| 108 NULL. */ | |
| 109 | |
| 111 | 110 vec<edge_var_map> * |
| 0 | 111 redirect_edge_var_map_vector (edge e) |
| 112 { | |
| 113 /* Hey, what kind of idiot would... you'd be surprised. */ | |
| 114 if (!edge_var_maps) | |
| 115 return NULL; | |
| 116 | |
| 111 | 117 auto_vec<edge_var_map> *slot = edge_var_maps->get (e); |
| 0 | 118 if (!slot) |
| 119 return NULL; | |
| 120 | |
| 111 | 121 return slot; |
| 0 | 122 } |
| 123 | |
| 124 /* Clear the edge variable mappings. */ | |
| 125 | |
| 126 void | |
| 111 | 127 redirect_edge_var_map_empty (void) |
| 0 | 128 { |
| 129 if (edge_var_maps) | |
| 111 | 130 edge_var_maps->empty (); |
| 0 | 131 } |
| 132 | |
| 133 | |
| 134 /* Remove the corresponding arguments from the PHI nodes in E's | |
| 135 destination block and redirect it to DEST. Return redirected edge. | |
| 136 The list of removed arguments is stored in a vector accessed | |
| 137 through edge_var_maps. */ | |
| 138 | |
| 139 edge | |
| 140 ssa_redirect_edge (edge e, basic_block dest) | |
| 141 { | |
| 111 | 142 gphi_iterator gsi; |
| 143 gphi *phi; | |
| 0 | 144 |
| 145 redirect_edge_var_map_clear (e); | |
| 146 | |
| 111 | 147 /* Remove the appropriate PHI arguments in E's destination block. |
| 148 If we are redirecting a copied edge the destination has not | |
| 149 got PHI argument space reserved nor an interesting argument. */ | |
| 150 if (! (e->dest->flags & BB_DUPLICATED)) | |
| 151 for (gsi = gsi_start_phis (e->dest); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 152 { | |
| 153 tree def; | |
| 145 | 154 location_t locus; |
| 0 | 155 |
| 111 | 156 phi = gsi.phi (); |
| 157 def = gimple_phi_arg_def (phi, e->dest_idx); | |
| 158 locus = gimple_phi_arg_location (phi, e->dest_idx); | |
| 0 | 159 |
| 111 | 160 if (def == NULL_TREE) |
| 161 continue; | |
| 0 | 162 |
| 111 | 163 redirect_edge_var_map_add (e, gimple_phi_result (phi), def, locus); |
| 164 } | |
| 0 | 165 |
| 166 e = redirect_edge_succ_nodup (e, dest); | |
| 167 | |
| 168 return e; | |
| 169 } | |
| 170 | |
| 171 | |
| 172 /* Add PHI arguments queued in PENDING_STMT list on edge E to edge | |
| 173 E->dest. */ | |
| 174 | |
| 175 void | |
| 176 flush_pending_stmts (edge e) | |
| 177 { | |
| 111 | 178 gphi *phi; |
| 0 | 179 edge_var_map *vm; |
| 180 int i; | |
| 111 | 181 gphi_iterator gsi; |
| 0 | 182 |
| 111 | 183 vec<edge_var_map> *v = redirect_edge_var_map_vector (e); |
| 0 | 184 if (!v) |
| 185 return; | |
| 186 | |
| 187 for (gsi = gsi_start_phis (e->dest), i = 0; | |
| 111 | 188 !gsi_end_p (gsi) && v->iterate (i, &vm); |
| 0 | 189 gsi_next (&gsi), i++) |
| 190 { | |
| 191 tree def; | |
| 192 | |
| 111 | 193 phi = gsi.phi (); |
| 0 | 194 def = redirect_edge_var_map_def (vm); |
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195 add_phi_arg (phi, def, e, redirect_edge_var_map_location (vm)); |
| 0 | 196 } |
| 197 | |
| 198 redirect_edge_var_map_clear (e); | |
| 199 } | |
| 200 | |
| 111 | 201 /* Replace the LHS of STMT, an assignment, either a GIMPLE_ASSIGN or a |
| 202 GIMPLE_CALL, with NLHS, in preparation for modifying the RHS to an | |
| 203 expression with a different value. | |
| 204 | |
| 205 This will update any annotations (say debug bind stmts) referring | |
| 206 to the original LHS, so that they use the RHS instead. This is | |
| 207 done even if NLHS and LHS are the same, for it is understood that | |
| 208 the RHS will be modified afterwards, and NLHS will not be assigned | |
| 209 an equivalent value. | |
| 210 | |
| 211 Adjusting any non-annotation uses of the LHS, if needed, is a | |
| 212 responsibility of the caller. | |
| 213 | |
| 214 The effect of this call should be pretty much the same as that of | |
| 215 inserting a copy of STMT before STMT, and then removing the | |
| 216 original stmt, at which time gsi_remove() would have update | |
| 217 annotations, but using this function saves all the inserting, | |
| 218 copying and removing. */ | |
| 219 | |
| 220 void | |
| 221 gimple_replace_ssa_lhs (gimple *stmt, tree nlhs) | |
| 222 { | |
| 131 | 223 if (MAY_HAVE_DEBUG_BIND_STMTS) |
| 111 | 224 { |
| 225 tree lhs = gimple_get_lhs (stmt); | |
| 226 | |
| 227 gcc_assert (SSA_NAME_DEF_STMT (lhs) == stmt); | |
| 228 | |
| 229 insert_debug_temp_for_var_def (NULL, lhs); | |
| 230 } | |
| 231 | |
| 232 gimple_set_lhs (stmt, nlhs); | |
| 233 } | |
| 234 | |
| 235 | |
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236 /* Given a tree for an expression for which we might want to emit |
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237 locations or values in debug information (generally a variable, but |
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238 we might deal with other kinds of trees in the future), return the |
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239 tree that should be used as the variable of a DEBUG_BIND STMT or |
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240 VAR_LOCATION INSN or NOTE. Return NULL if VAR is not to be tracked. */ |
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241 |
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242 tree |
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243 target_for_debug_bind (tree var) |
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244 { |
| 131 | 245 if (!MAY_HAVE_DEBUG_BIND_STMTS) |
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246 return NULL_TREE; |
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247 |
| 111 | 248 if (TREE_CODE (var) == SSA_NAME) |
| 249 { | |
| 250 var = SSA_NAME_VAR (var); | |
| 251 if (var == NULL_TREE) | |
| 252 return NULL_TREE; | |
| 253 } | |
| 254 | |
| 255 if ((!VAR_P (var) || VAR_DECL_IS_VIRTUAL_OPERAND (var)) | |
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256 && TREE_CODE (var) != PARM_DECL) |
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257 return NULL_TREE; |
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258 |
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259 if (DECL_HAS_VALUE_EXPR_P (var)) |
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260 return target_for_debug_bind (DECL_VALUE_EXPR (var)); |
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261 |
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262 if (DECL_IGNORED_P (var)) |
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263 return NULL_TREE; |
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264 |
| 111 | 265 /* var-tracking only tracks registers. */ |
| 266 if (!is_gimple_reg_type (TREE_TYPE (var))) | |
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267 return NULL_TREE; |
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268 |
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269 return var; |
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270 } |
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271 |
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272 /* Called via walk_tree, look for SSA_NAMEs that have already been |
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273 released. */ |
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274 |
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275 static tree |
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276 find_released_ssa_name (tree *tp, int *walk_subtrees, void *data_) |
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277 { |
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278 struct walk_stmt_info *wi = (struct walk_stmt_info *) data_; |
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279 |
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280 if (wi && wi->is_lhs) |
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281 return NULL_TREE; |
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282 |
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283 if (TREE_CODE (*tp) == SSA_NAME) |
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284 { |
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285 if (SSA_NAME_IN_FREE_LIST (*tp)) |
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286 return *tp; |
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287 |
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288 *walk_subtrees = 0; |
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289 } |
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290 else if (IS_TYPE_OR_DECL_P (*tp)) |
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291 *walk_subtrees = 0; |
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292 |
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293 return NULL_TREE; |
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294 } |
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295 |
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296 /* Insert a DEBUG BIND stmt before the DEF of VAR if VAR is referenced |
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297 by other DEBUG stmts, and replace uses of the DEF with the |
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298 newly-created debug temp. */ |
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299 |
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300 void |
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301 insert_debug_temp_for_var_def (gimple_stmt_iterator *gsi, tree var) |
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302 { |
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303 imm_use_iterator imm_iter; |
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304 use_operand_p use_p; |
| 111 | 305 gimple *stmt; |
| 306 gimple *def_stmt = NULL; | |
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307 int usecount = 0; |
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308 tree value = NULL; |
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309 |
| 131 | 310 if (!MAY_HAVE_DEBUG_BIND_STMTS) |
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311 return; |
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312 |
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313 /* If this name has already been registered for replacement, do nothing |
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314 as anything that uses this name isn't in SSA form. */ |
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315 if (name_registered_for_update_p (var)) |
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316 return; |
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317 |
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318 /* Check whether there are debug stmts that reference this variable and, |
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319 if there are, decide whether we should use a debug temp. */ |
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320 FOR_EACH_IMM_USE_FAST (use_p, imm_iter, var) |
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321 { |
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322 stmt = USE_STMT (use_p); |
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323 |
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324 if (!gimple_debug_bind_p (stmt)) |
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325 continue; |
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326 |
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327 if (usecount++) |
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328 break; |
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329 |
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330 if (gimple_debug_bind_get_value (stmt) != var) |
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331 { |
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332 /* Count this as an additional use, so as to make sure we |
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333 use a temp unless VAR's definition has a SINGLE_RHS that |
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334 can be shared. */ |
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335 usecount++; |
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336 break; |
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337 } |
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338 } |
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339 |
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340 if (!usecount) |
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341 return; |
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342 |
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343 if (gsi) |
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344 def_stmt = gsi_stmt (*gsi); |
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345 else |
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346 def_stmt = SSA_NAME_DEF_STMT (var); |
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347 |
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348 /* If we didn't get an insertion point, and the stmt has already |
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349 been removed, we won't be able to insert the debug bind stmt, so |
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350 we'll have to drop debug information. */ |
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351 if (gimple_code (def_stmt) == GIMPLE_PHI) |
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352 { |
| 111 | 353 value = degenerate_phi_result (as_a <gphi *> (def_stmt)); |
|
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354 if (value && walk_tree (&value, find_released_ssa_name, NULL, NULL)) |
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355 value = NULL; |
| 111 | 356 /* error_mark_node is what fixup_noreturn_call changes PHI arguments |
| 357 to. */ | |
| 358 else if (value == error_mark_node) | |
| 359 value = NULL; | |
|
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360 } |
| 145 | 361 else if (gimple_clobber_p (def_stmt)) |
| 362 /* We can end up here when rewriting a decl into SSA and coming | |
| 363 along a clobber for the original decl. Turn that into | |
| 364 # DEBUG decl => NULL */ | |
| 365 value = NULL; | |
|
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366 else if (is_gimple_assign (def_stmt)) |
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367 { |
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368 bool no_value = false; |
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369 |
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370 if (!dom_info_available_p (CDI_DOMINATORS)) |
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371 { |
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372 struct walk_stmt_info wi; |
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373 |
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374 memset (&wi, 0, sizeof (wi)); |
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375 |
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376 /* When removing blocks without following reverse dominance |
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377 order, we may sometimes encounter SSA_NAMEs that have |
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378 already been released, referenced in other SSA_DEFs that |
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379 we're about to release. Consider: |
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380 |
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381 <bb X>: |
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382 v_1 = foo; |
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383 |
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384 <bb Y>: |
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385 w_2 = v_1 + bar; |
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386 # DEBUG w => w_2 |
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387 |
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388 If we deleted BB X first, propagating the value of w_2 |
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389 won't do us any good. It's too late to recover their |
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390 original definition of v_1: when it was deleted, it was |
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391 only referenced in other DEFs, it couldn't possibly know |
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392 it should have been retained, and propagating every |
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393 single DEF just in case it might have to be propagated |
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394 into a DEBUG STMT would probably be too wasteful. |
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395 |
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396 When dominator information is not readily available, we |
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397 check for and accept some loss of debug information. But |
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398 if it is available, there's no excuse for us to remove |
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399 blocks in the wrong order, so we don't even check for |
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400 dead SSA NAMEs. SSA verification shall catch any |
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401 errors. */ |
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402 if ((!gsi && !gimple_bb (def_stmt)) |
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403 || walk_gimple_op (def_stmt, find_released_ssa_name, &wi)) |
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404 no_value = true; |
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405 } |
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406 |
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407 if (!no_value) |
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408 value = gimple_assign_rhs_to_tree (def_stmt); |
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409 } |
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410 |
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411 if (value) |
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412 { |
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413 /* If there's a single use of VAR, and VAR is the entire debug |
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414 expression (usecount would have been incremented again |
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415 otherwise), and the definition involves only constants and |
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416 SSA names, then we can propagate VALUE into this single use, |
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417 avoiding the temp. |
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418 |
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419 We can also avoid using a temp if VALUE can be shared and |
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420 propagated into all uses, without generating expressions that |
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421 wouldn't be valid gimple RHSs. |
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422 |
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423 Other cases that would require unsharing or non-gimple RHSs |
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424 are deferred to a debug temp, although we could avoid temps |
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425 at the expense of duplication of expressions. */ |
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426 |
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427 if (CONSTANT_CLASS_P (value) |
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428 || gimple_code (def_stmt) == GIMPLE_PHI |
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429 || (usecount == 1 |
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430 && (!gimple_assign_single_p (def_stmt) |
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431 || is_gimple_min_invariant (value))) |
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432 || is_gimple_reg (value)) |
| 111 | 433 ; |
|
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434 else |
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435 { |
| 111 | 436 gdebug *def_temp; |
|
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437 tree vexpr = make_node (DEBUG_EXPR_DECL); |
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438 |
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439 def_temp = gimple_build_debug_bind (vexpr, |
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440 unshare_expr (value), |
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441 def_stmt); |
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442 |
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443 DECL_ARTIFICIAL (vexpr) = 1; |
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444 TREE_TYPE (vexpr) = TREE_TYPE (value); |
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445 if (DECL_P (value)) |
| 111 | 446 SET_DECL_MODE (vexpr, DECL_MODE (value)); |
|
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447 else |
| 111 | 448 SET_DECL_MODE (vexpr, TYPE_MODE (TREE_TYPE (value))); |
|
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449 |
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450 if (gsi) |
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451 gsi_insert_before (gsi, def_temp, GSI_SAME_STMT); |
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452 else |
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453 { |
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454 gimple_stmt_iterator ngsi = gsi_for_stmt (def_stmt); |
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455 gsi_insert_before (&ngsi, def_temp, GSI_SAME_STMT); |
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456 } |
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457 |
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458 value = vexpr; |
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459 } |
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460 } |
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461 |
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462 FOR_EACH_IMM_USE_STMT (stmt, imm_iter, var) |
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463 { |
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464 if (!gimple_debug_bind_p (stmt)) |
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465 continue; |
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466 |
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467 if (value) |
| 111 | 468 { |
| 469 FOR_EACH_IMM_USE_ON_STMT (use_p, imm_iter) | |
| 470 /* unshare_expr is not needed here. vexpr is either a | |
| 471 SINGLE_RHS, that can be safely shared, some other RHS | |
| 472 that was unshared when we found it had a single debug | |
| 473 use, or a DEBUG_EXPR_DECL, that can be safely | |
| 474 shared. */ | |
| 475 SET_USE (use_p, unshare_expr (value)); | |
| 476 /* If we didn't replace uses with a debug decl fold the | |
| 477 resulting expression. Otherwise we end up with invalid IL. */ | |
| 478 if (TREE_CODE (value) != DEBUG_EXPR_DECL) | |
| 479 { | |
| 480 gimple_stmt_iterator gsi = gsi_for_stmt (stmt); | |
| 481 fold_stmt_inplace (&gsi); | |
| 482 } | |
| 483 } | |
|
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484 else |
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485 gimple_debug_bind_reset_value (stmt); |
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486 |
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487 update_stmt (stmt); |
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488 } |
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489 } |
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490 |
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491 |
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492 /* Insert a DEBUG BIND stmt before STMT for each DEF referenced by |
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493 other DEBUG stmts, and replace uses of the DEF with the |
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494 newly-created debug temp. */ |
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495 |
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496 void |
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497 insert_debug_temps_for_defs (gimple_stmt_iterator *gsi) |
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498 { |
| 111 | 499 gimple *stmt; |
|
55
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500 ssa_op_iter op_iter; |
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501 def_operand_p def_p; |
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502 |
| 131 | 503 if (!MAY_HAVE_DEBUG_BIND_STMTS) |
|
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504 return; |
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505 |
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506 stmt = gsi_stmt (*gsi); |
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507 |
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508 FOR_EACH_PHI_OR_STMT_DEF (def_p, stmt, op_iter, SSA_OP_DEF) |
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509 { |
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510 tree var = DEF_FROM_PTR (def_p); |
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511 |
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512 if (TREE_CODE (var) != SSA_NAME) |
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513 continue; |
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514 |
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515 insert_debug_temp_for_var_def (gsi, var); |
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516 } |
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517 } |
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518 |
| 111 | 519 /* Reset all debug stmts that use SSA_NAME(s) defined in STMT. */ |
| 520 | |
| 521 void | |
| 522 reset_debug_uses (gimple *stmt) | |
| 523 { | |
| 524 ssa_op_iter op_iter; | |
| 525 def_operand_p def_p; | |
| 526 imm_use_iterator imm_iter; | |
| 527 gimple *use_stmt; | |
| 528 | |
| 131 | 529 if (!MAY_HAVE_DEBUG_BIND_STMTS) |
| 111 | 530 return; |
| 531 | |
| 532 FOR_EACH_PHI_OR_STMT_DEF (def_p, stmt, op_iter, SSA_OP_DEF) | |
| 533 { | |
| 534 tree var = DEF_FROM_PTR (def_p); | |
| 535 | |
| 536 if (TREE_CODE (var) != SSA_NAME) | |
| 537 continue; | |
| 538 | |
| 539 FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, var) | |
| 540 { | |
| 541 if (!gimple_debug_bind_p (use_stmt)) | |
| 542 continue; | |
| 543 | |
| 544 gimple_debug_bind_reset_value (use_stmt); | |
| 545 update_stmt (use_stmt); | |
| 546 } | |
| 547 } | |
| 548 } | |
| 549 | |
|
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550 /* Delete SSA DEFs for SSA versions in the TOREMOVE bitmap, removing |
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551 dominated stmts before their dominators, so that release_ssa_defs |
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552 stands a chance of propagating DEFs into debug bind stmts. */ |
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553 |
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554 void |
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555 release_defs_bitset (bitmap toremove) |
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556 { |
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557 unsigned j; |
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558 bitmap_iterator bi; |
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559 |
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560 /* Performing a topological sort is probably overkill, this will |
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561 most likely run in slightly superlinear time, rather than the |
| 145 | 562 pathological quadratic worst case. |
| 563 But iterate from max SSA name version to min one because | |
| 564 that mimics allocation order during code generation behavior best. | |
| 565 Use an array for this which we compact on-the-fly with a NULL | |
| 566 marker moving towards the end of the vector. */ | |
| 567 auto_vec<tree, 16> names; | |
| 568 names.reserve (bitmap_count_bits (toremove) + 1); | |
| 569 names.quick_push (NULL_TREE); | |
| 570 EXECUTE_IF_SET_IN_BITMAP (toremove, 0, j, bi) | |
| 571 names.quick_push (ssa_name (j)); | |
| 572 | |
| 573 bitmap_tree_view (toremove); | |
|
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574 while (!bitmap_empty_p (toremove)) |
| 111 | 575 { |
| 145 | 576 j = names.length () - 1; |
| 577 for (unsigned i = names.length () - 1; names[i];) | |
| 111 | 578 { |
| 579 bool remove_now = true; | |
| 145 | 580 tree var = names[i]; |
| 111 | 581 gimple *stmt; |
| 582 imm_use_iterator uit; | |
|
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|
583 |
| 111 | 584 FOR_EACH_IMM_USE_STMT (stmt, uit, var) |
| 585 { | |
| 586 ssa_op_iter dit; | |
| 587 def_operand_p def_p; | |
| 588 | |
| 589 /* We can't propagate PHI nodes into debug stmts. */ | |
| 590 if (gimple_code (stmt) == GIMPLE_PHI | |
| 591 || is_gimple_debug (stmt)) | |
| 592 continue; | |
| 593 | |
| 594 /* If we find another definition to remove that uses | |
| 595 the one we're looking at, defer the removal of this | |
| 596 one, so that it can be propagated into debug stmts | |
| 597 after the other is. */ | |
| 598 FOR_EACH_SSA_DEF_OPERAND (def_p, stmt, dit, SSA_OP_DEF) | |
| 599 { | |
| 600 tree odef = DEF_FROM_PTR (def_p); | |
|
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601 |
| 111 | 602 if (bitmap_bit_p (toremove, SSA_NAME_VERSION (odef))) |
| 603 { | |
| 604 remove_now = false; | |
| 605 break; | |
| 606 } | |
| 607 } | |
| 608 | |
| 609 if (!remove_now) | |
| 610 BREAK_FROM_IMM_USE_STMT (uit); | |
| 611 } | |
| 612 | |
| 613 if (remove_now) | |
| 614 { | |
| 615 gimple *def = SSA_NAME_DEF_STMT (var); | |
| 616 gimple_stmt_iterator gsi = gsi_for_stmt (def); | |
|
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617 |
| 111 | 618 if (gimple_code (def) == GIMPLE_PHI) |
| 619 remove_phi_node (&gsi, true); | |
| 620 else | |
| 621 { | |
| 622 gsi_remove (&gsi, true); | |
| 623 release_defs (def); | |
| 624 } | |
| 145 | 625 bitmap_clear_bit (toremove, SSA_NAME_VERSION (var)); |
| 111 | 626 } |
| 145 | 627 else |
| 628 --i; | |
| 629 if (--j != i) | |
| 630 names[i] = names[j]; | |
| 111 | 631 } |
| 632 } | |
| 145 | 633 bitmap_list_view (toremove); |
| 634 } | |
| 111 | 635 |
| 145 | 636 /* Disable warnings about missing quoting in GCC diagnostics for |
| 637 the verification errors. Their format strings don't follow GCC | |
| 638 diagnostic conventions and the calls are ultimately followed by | |
| 639 one to internal_error. */ | |
| 640 #if __GNUC__ >= 10 | |
| 641 # pragma GCC diagnostic push | |
| 642 # pragma GCC diagnostic ignored "-Wformat-diag" | |
| 643 #endif | |
| 111 | 644 |
| 645 /* Verify virtual SSA form. */ | |
| 646 | |
| 647 bool | |
| 648 verify_vssa (basic_block bb, tree current_vdef, sbitmap visited) | |
| 649 { | |
| 650 bool err = false; | |
| 651 | |
| 652 if (bitmap_bit_p (visited, bb->index)) | |
| 653 return false; | |
| 654 | |
| 655 bitmap_set_bit (visited, bb->index); | |
|
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|
656 |
| 111 | 657 /* Pick up the single virtual PHI def. */ |
| 658 gphi *phi = NULL; | |
| 659 for (gphi_iterator si = gsi_start_phis (bb); !gsi_end_p (si); | |
| 660 gsi_next (&si)) | |
| 661 { | |
| 662 tree res = gimple_phi_result (si.phi ()); | |
| 663 if (virtual_operand_p (res)) | |
| 664 { | |
| 665 if (phi) | |
| 666 { | |
| 667 error ("multiple virtual PHI nodes in BB %d", bb->index); | |
| 668 print_gimple_stmt (stderr, phi, 0); | |
| 669 print_gimple_stmt (stderr, si.phi (), 0); | |
| 670 err = true; | |
| 671 } | |
| 672 else | |
| 673 phi = si.phi (); | |
| 674 } | |
| 675 } | |
| 676 if (phi) | |
| 677 { | |
| 678 current_vdef = gimple_phi_result (phi); | |
| 679 if (TREE_CODE (current_vdef) != SSA_NAME) | |
| 680 { | |
| 681 error ("virtual definition is not an SSA name"); | |
| 682 print_gimple_stmt (stderr, phi, 0); | |
| 683 err = true; | |
| 684 } | |
| 685 } | |
|
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|
686 |
| 111 | 687 /* Verify stmts. */ |
| 688 for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi); | |
| 689 gsi_next (&gsi)) | |
| 690 { | |
| 691 gimple *stmt = gsi_stmt (gsi); | |
| 692 tree vuse = gimple_vuse (stmt); | |
| 693 if (vuse) | |
| 694 { | |
| 695 if (vuse != current_vdef) | |
| 696 { | |
| 697 error ("stmt with wrong VUSE"); | |
| 698 print_gimple_stmt (stderr, stmt, 0, TDF_VOPS); | |
| 699 fprintf (stderr, "expected "); | |
| 700 print_generic_expr (stderr, current_vdef); | |
| 701 fprintf (stderr, "\n"); | |
| 702 err = true; | |
| 703 } | |
| 704 tree vdef = gimple_vdef (stmt); | |
| 705 if (vdef) | |
| 706 { | |
| 707 current_vdef = vdef; | |
| 708 if (TREE_CODE (current_vdef) != SSA_NAME) | |
| 709 { | |
| 710 error ("virtual definition is not an SSA name"); | |
| 711 print_gimple_stmt (stderr, phi, 0); | |
| 712 err = true; | |
| 713 } | |
| 714 } | |
| 715 } | |
| 716 } | |
|
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|
717 |
| 111 | 718 /* Verify destination PHI uses and recurse. */ |
| 719 edge_iterator ei; | |
| 720 edge e; | |
| 721 FOR_EACH_EDGE (e, ei, bb->succs) | |
| 722 { | |
| 723 gphi *phi = get_virtual_phi (e->dest); | |
| 724 if (phi | |
| 725 && PHI_ARG_DEF_FROM_EDGE (phi, e) != current_vdef) | |
| 726 { | |
| 727 error ("PHI node with wrong VUSE on edge from BB %d", | |
| 728 e->src->index); | |
| 729 print_gimple_stmt (stderr, phi, 0, TDF_VOPS); | |
| 730 fprintf (stderr, "expected "); | |
| 731 print_generic_expr (stderr, current_vdef); | |
| 732 fprintf (stderr, "\n"); | |
| 733 err = true; | |
| 734 } | |
|
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|
735 |
| 111 | 736 /* Recurse. */ |
| 737 err |= verify_vssa (e->dest, current_vdef, visited); | |
| 738 } | |
| 739 | |
| 740 return err; | |
|
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|
741 } |
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|
742 |
| 0 | 743 /* Return true if SSA_NAME is malformed and mark it visited. |
| 744 | |
| 745 IS_VIRTUAL is true if this SSA_NAME was found inside a virtual | |
| 746 operand. */ | |
| 747 | |
| 748 static bool | |
| 749 verify_ssa_name (tree ssa_name, bool is_virtual) | |
| 750 { | |
| 751 if (TREE_CODE (ssa_name) != SSA_NAME) | |
| 752 { | |
| 753 error ("expected an SSA_NAME object"); | |
| 754 return true; | |
| 755 } | |
| 756 | |
| 757 if (SSA_NAME_IN_FREE_LIST (ssa_name)) | |
| 758 { | |
| 759 error ("found an SSA_NAME that had been released into the free pool"); | |
| 760 return true; | |
| 761 } | |
| 762 | |
| 111 | 763 if (SSA_NAME_VAR (ssa_name) != NULL_TREE |
| 764 && TREE_TYPE (ssa_name) != TREE_TYPE (SSA_NAME_VAR (ssa_name))) | |
| 765 { | |
| 766 error ("type mismatch between an SSA_NAME and its symbol"); | |
| 767 return true; | |
| 768 } | |
| 769 | |
| 770 if (is_virtual && !virtual_operand_p (ssa_name)) | |
| 0 | 771 { |
| 772 error ("found a virtual definition for a GIMPLE register"); | |
| 773 return true; | |
| 774 } | |
| 775 | |
|
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776 if (is_virtual && SSA_NAME_VAR (ssa_name) != gimple_vop (cfun)) |
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777 { |
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|
778 error ("virtual SSA name for non-VOP decl"); |
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|
779 return true; |
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|
780 } |
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|
781 |
| 111 | 782 if (!is_virtual && virtual_operand_p (ssa_name)) |
| 0 | 783 { |
| 784 error ("found a real definition for a non-register"); | |
| 785 return true; | |
| 786 } | |
| 787 | |
| 788 if (SSA_NAME_IS_DEFAULT_DEF (ssa_name) | |
| 789 && !gimple_nop_p (SSA_NAME_DEF_STMT (ssa_name))) | |
| 790 { | |
| 791 error ("found a default name with a non-empty defining statement"); | |
| 792 return true; | |
| 793 } | |
| 794 | |
| 795 return false; | |
| 796 } | |
| 797 | |
| 798 | |
| 799 /* Return true if the definition of SSA_NAME at block BB is malformed. | |
| 800 | |
| 801 STMT is the statement where SSA_NAME is created. | |
| 802 | |
| 803 DEFINITION_BLOCK is an array of basic blocks indexed by SSA_NAME | |
| 804 version numbers. If DEFINITION_BLOCK[SSA_NAME_VERSION] is set, | |
| 805 it means that the block in that array slot contains the | |
| 806 definition of SSA_NAME. | |
| 807 | |
| 808 IS_VIRTUAL is true if SSA_NAME is created by a VDEF. */ | |
| 809 | |
| 810 static bool | |
| 811 verify_def (basic_block bb, basic_block *definition_block, tree ssa_name, | |
| 111 | 812 gimple *stmt, bool is_virtual) |
| 0 | 813 { |
| 814 if (verify_ssa_name (ssa_name, is_virtual)) | |
| 815 goto err; | |
| 816 | |
| 111 | 817 if (SSA_NAME_VAR (ssa_name) |
| 818 && TREE_CODE (SSA_NAME_VAR (ssa_name)) == RESULT_DECL | |
|
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|
819 && DECL_BY_REFERENCE (SSA_NAME_VAR (ssa_name))) |
|
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|
820 { |
|
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|
821 error ("RESULT_DECL should be read only when DECL_BY_REFERENCE is set"); |
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|
822 goto err; |
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|
823 } |
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|
824 |
| 0 | 825 if (definition_block[SSA_NAME_VERSION (ssa_name)]) |
| 826 { | |
| 827 error ("SSA_NAME created in two different blocks %i and %i", | |
| 828 definition_block[SSA_NAME_VERSION (ssa_name)]->index, bb->index); | |
| 829 goto err; | |
| 830 } | |
| 831 | |
| 832 definition_block[SSA_NAME_VERSION (ssa_name)] = bb; | |
| 833 | |
| 834 if (SSA_NAME_DEF_STMT (ssa_name) != stmt) | |
| 835 { | |
| 836 error ("SSA_NAME_DEF_STMT is wrong"); | |
| 837 fprintf (stderr, "Expected definition statement:\n"); | |
| 838 print_gimple_stmt (stderr, SSA_NAME_DEF_STMT (ssa_name), 4, TDF_VOPS); | |
| 839 fprintf (stderr, "\nActual definition statement:\n"); | |
| 840 print_gimple_stmt (stderr, stmt, 4, TDF_VOPS); | |
| 841 goto err; | |
| 842 } | |
| 843 | |
| 844 return false; | |
| 845 | |
| 846 err: | |
| 847 fprintf (stderr, "while verifying SSA_NAME "); | |
| 111 | 848 print_generic_expr (stderr, ssa_name); |
| 0 | 849 fprintf (stderr, " in statement\n"); |
| 850 print_gimple_stmt (stderr, stmt, 4, TDF_VOPS); | |
| 851 | |
| 852 return true; | |
| 853 } | |
| 854 | |
| 855 | |
| 856 /* Return true if the use of SSA_NAME at statement STMT in block BB is | |
| 857 malformed. | |
| 858 | |
| 859 DEF_BB is the block where SSA_NAME was found to be created. | |
| 860 | |
| 861 IDOM contains immediate dominator information for the flowgraph. | |
| 862 | |
| 863 CHECK_ABNORMAL is true if the caller wants to check whether this use | |
| 864 is flowing through an abnormal edge (only used when checking PHI | |
| 865 arguments). | |
| 866 | |
| 867 If NAMES_DEFINED_IN_BB is not NULL, it contains a bitmap of ssa names | |
| 868 that are defined before STMT in basic block BB. */ | |
| 869 | |
| 870 static bool | |
| 871 verify_use (basic_block bb, basic_block def_bb, use_operand_p use_p, | |
| 111 | 872 gimple *stmt, bool check_abnormal, bitmap names_defined_in_bb) |
| 0 | 873 { |
| 874 bool err = false; | |
| 875 tree ssa_name = USE_FROM_PTR (use_p); | |
| 876 | |
| 877 if (!TREE_VISITED (ssa_name)) | |
| 878 if (verify_imm_links (stderr, ssa_name)) | |
| 879 err = true; | |
| 880 | |
| 881 TREE_VISITED (ssa_name) = 1; | |
| 882 | |
| 883 if (gimple_nop_p (SSA_NAME_DEF_STMT (ssa_name)) | |
| 884 && SSA_NAME_IS_DEFAULT_DEF (ssa_name)) | |
| 885 ; /* Default definitions have empty statements. Nothing to do. */ | |
| 886 else if (!def_bb) | |
| 887 { | |
| 888 error ("missing definition"); | |
| 889 err = true; | |
| 890 } | |
| 891 else if (bb != def_bb | |
| 892 && !dominated_by_p (CDI_DOMINATORS, bb, def_bb)) | |
| 893 { | |
| 894 error ("definition in block %i does not dominate use in block %i", | |
| 895 def_bb->index, bb->index); | |
| 896 err = true; | |
| 897 } | |
| 898 else if (bb == def_bb | |
| 899 && names_defined_in_bb != NULL | |
| 900 && !bitmap_bit_p (names_defined_in_bb, SSA_NAME_VERSION (ssa_name))) | |
| 901 { | |
| 902 error ("definition in block %i follows the use", def_bb->index); | |
| 903 err = true; | |
| 904 } | |
| 905 | |
| 906 if (check_abnormal | |
| 907 && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ssa_name)) | |
| 908 { | |
| 909 error ("SSA_NAME_OCCURS_IN_ABNORMAL_PHI should be set"); | |
| 910 err = true; | |
| 911 } | |
| 912 | |
|
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|
913 /* Make sure the use is in an appropriate list by checking the previous |
| 0 | 914 element to make sure it's the same. */ |
| 915 if (use_p->prev == NULL) | |
| 916 { | |
| 917 error ("no immediate_use list"); | |
| 918 err = true; | |
| 919 } | |
| 920 else | |
| 921 { | |
| 922 tree listvar; | |
| 923 if (use_p->prev->use == NULL) | |
| 924 listvar = use_p->prev->loc.ssa_name; | |
| 925 else | |
| 926 listvar = USE_FROM_PTR (use_p->prev); | |
| 927 if (listvar != ssa_name) | |
| 928 { | |
| 929 error ("wrong immediate use list"); | |
| 930 err = true; | |
| 931 } | |
| 932 } | |
| 933 | |
| 934 if (err) | |
| 935 { | |
| 936 fprintf (stderr, "for SSA_NAME: "); | |
| 937 print_generic_expr (stderr, ssa_name, TDF_VOPS); | |
| 938 fprintf (stderr, " in statement:\n"); | |
| 939 print_gimple_stmt (stderr, stmt, 0, TDF_VOPS); | |
| 940 } | |
| 941 | |
| 942 return err; | |
| 943 } | |
| 944 | |
| 945 | |
| 946 /* Return true if any of the arguments for PHI node PHI at block BB is | |
| 947 malformed. | |
| 948 | |
| 949 DEFINITION_BLOCK is an array of basic blocks indexed by SSA_NAME | |
| 950 version numbers. If DEFINITION_BLOCK[SSA_NAME_VERSION] is set, | |
| 951 it means that the block in that array slot contains the | |
| 952 definition of SSA_NAME. */ | |
| 953 | |
| 954 static bool | |
| 111 | 955 verify_phi_args (gphi *phi, basic_block bb, basic_block *definition_block) |
| 0 | 956 { |
| 957 edge e; | |
| 958 bool err = false; | |
| 959 size_t i, phi_num_args = gimple_phi_num_args (phi); | |
| 960 | |
| 961 if (EDGE_COUNT (bb->preds) != phi_num_args) | |
| 962 { | |
| 963 error ("incoming edge count does not match number of PHI arguments"); | |
| 964 err = true; | |
| 965 goto error; | |
| 966 } | |
| 967 | |
| 968 for (i = 0; i < phi_num_args; i++) | |
| 969 { | |
| 970 use_operand_p op_p = gimple_phi_arg_imm_use_ptr (phi, i); | |
| 971 tree op = USE_FROM_PTR (op_p); | |
| 972 | |
| 973 e = EDGE_PRED (bb, i); | |
| 974 | |
| 975 if (op == NULL_TREE) | |
| 976 { | |
| 977 error ("PHI argument is missing for edge %d->%d", | |
| 978 e->src->index, | |
| 979 e->dest->index); | |
| 980 err = true; | |
| 981 goto error; | |
| 982 } | |
| 983 | |
| 984 if (TREE_CODE (op) != SSA_NAME && !is_gimple_min_invariant (op)) | |
| 985 { | |
| 986 error ("PHI argument is not SSA_NAME, or invariant"); | |
| 987 err = true; | |
| 988 } | |
| 989 | |
| 990 if (TREE_CODE (op) == SSA_NAME) | |
| 991 { | |
| 111 | 992 err = verify_ssa_name (op, virtual_operand_p (gimple_phi_result (phi))); |
| 0 | 993 err |= verify_use (e->src, definition_block[SSA_NAME_VERSION (op)], |
| 994 op_p, phi, e->flags & EDGE_ABNORMAL, NULL); | |
| 995 } | |
| 996 | |
|
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|
997 if (TREE_CODE (op) == ADDR_EXPR) |
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|
998 { |
|
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|
999 tree base = TREE_OPERAND (op, 0); |
|
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|
1000 while (handled_component_p (base)) |
|
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1001 base = TREE_OPERAND (base, 0); |
| 111 | 1002 if ((VAR_P (base) |
|
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1003 || TREE_CODE (base) == PARM_DECL |
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1004 || TREE_CODE (base) == RESULT_DECL) |
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1005 && !TREE_ADDRESSABLE (base)) |
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1006 { |
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1007 error ("address taken, but ADDRESSABLE bit not set"); |
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1008 err = true; |
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1009 } |
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1010 } |
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1011 |
| 0 | 1012 if (e->dest != bb) |
| 1013 { | |
| 1014 error ("wrong edge %d->%d for PHI argument", | |
| 1015 e->src->index, e->dest->index); | |
| 1016 err = true; | |
| 1017 } | |
| 1018 | |
| 1019 if (err) | |
| 1020 { | |
| 1021 fprintf (stderr, "PHI argument\n"); | |
| 1022 print_generic_stmt (stderr, op, TDF_VOPS); | |
| 1023 goto error; | |
| 1024 } | |
| 1025 } | |
| 1026 | |
| 1027 error: | |
| 1028 if (err) | |
| 1029 { | |
| 1030 fprintf (stderr, "for PHI node\n"); | |
| 1031 print_gimple_stmt (stderr, phi, 0, TDF_VOPS|TDF_MEMSYMS); | |
| 1032 } | |
| 1033 | |
| 1034 | |
| 1035 return err; | |
| 1036 } | |
| 1037 | |
| 1038 | |
| 1039 /* Verify common invariants in the SSA web. | |
| 1040 TODO: verify the variable annotations. */ | |
| 1041 | |
|
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|
1042 DEBUG_FUNCTION void |
| 111 | 1043 verify_ssa (bool check_modified_stmt, bool check_ssa_operands) |
| 0 | 1044 { |
| 1045 basic_block bb; | |
| 1046 basic_block *definition_block = XCNEWVEC (basic_block, num_ssa_names); | |
| 1047 ssa_op_iter iter; | |
| 1048 tree op; | |
| 1049 enum dom_state orig_dom_state = dom_info_state (CDI_DOMINATORS); | |
| 111 | 1050 auto_bitmap names_defined_in_bb; |
| 0 | 1051 |
|
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1052 gcc_assert (!need_ssa_update_p (cfun)); |
| 0 | 1053 |
| 1054 timevar_push (TV_TREE_SSA_VERIFY); | |
| 1055 | |
| 1056 { | |
| 111 | 1057 /* Keep track of SSA names present in the IL. */ |
| 1058 size_t i; | |
| 1059 tree name; | |
| 1060 hash_map <void *, tree> ssa_info; | |
| 1061 | |
| 1062 FOR_EACH_SSA_NAME (i, name, cfun) | |
| 0 | 1063 { |
| 111 | 1064 gimple *stmt; |
| 0 | 1065 TREE_VISITED (name) = 0; |
| 1066 | |
| 111 | 1067 verify_ssa_name (name, virtual_operand_p (name)); |
| 1068 | |
| 0 | 1069 stmt = SSA_NAME_DEF_STMT (name); |
| 1070 if (!gimple_nop_p (stmt)) | |
| 1071 { | |
| 1072 basic_block bb = gimple_bb (stmt); | |
| 111 | 1073 if (verify_def (bb, definition_block, |
| 1074 name, stmt, virtual_operand_p (name))) | |
| 1075 goto err; | |
| 1076 } | |
| 0 | 1077 |
| 111 | 1078 void *info = NULL; |
| 1079 if (POINTER_TYPE_P (TREE_TYPE (name))) | |
| 1080 info = SSA_NAME_PTR_INFO (name); | |
| 1081 else if (INTEGRAL_TYPE_P (TREE_TYPE (name))) | |
| 1082 info = SSA_NAME_RANGE_INFO (name); | |
| 1083 if (info) | |
| 1084 { | |
| 1085 bool existed; | |
| 1086 tree &val = ssa_info.get_or_insert (info, &existed); | |
| 1087 if (existed) | |
| 1088 { | |
| 1089 error ("shared SSA name info"); | |
| 1090 print_generic_expr (stderr, val); | |
| 1091 fprintf (stderr, " and "); | |
| 1092 print_generic_expr (stderr, name); | |
| 1093 fprintf (stderr, "\n"); | |
| 1094 goto err; | |
| 1095 } | |
| 1096 else | |
| 1097 val = name; | |
| 0 | 1098 } |
| 1099 } | |
| 1100 } | |
| 1101 | |
| 1102 calculate_dominance_info (CDI_DOMINATORS); | |
| 1103 | |
| 1104 /* Now verify all the uses and make sure they agree with the definitions | |
| 1105 found in the previous pass. */ | |
| 111 | 1106 FOR_EACH_BB_FN (bb, cfun) |
| 0 | 1107 { |
| 1108 edge e; | |
| 1109 edge_iterator ei; | |
| 1110 | |
| 1111 /* Make sure that all edges have a clear 'aux' field. */ | |
| 1112 FOR_EACH_EDGE (e, ei, bb->preds) | |
| 1113 { | |
| 1114 if (e->aux) | |
| 1115 { | |
| 1116 error ("AUX pointer initialized for edge %d->%d", e->src->index, | |
| 1117 e->dest->index); | |
| 1118 goto err; | |
| 1119 } | |
| 1120 } | |
| 1121 | |
| 1122 /* Verify the arguments for every PHI node in the block. */ | |
| 111 | 1123 for (gphi_iterator gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
| 0 | 1124 { |
| 111 | 1125 gphi *phi = gsi.phi (); |
| 0 | 1126 if (verify_phi_args (phi, bb, definition_block)) |
| 1127 goto err; | |
| 1128 | |
| 1129 bitmap_set_bit (names_defined_in_bb, | |
| 1130 SSA_NAME_VERSION (gimple_phi_result (phi))); | |
| 1131 } | |
| 1132 | |
| 1133 /* Now verify all the uses and vuses in every statement of the block. */ | |
| 111 | 1134 for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi); |
| 1135 gsi_next (&gsi)) | |
| 0 | 1136 { |
| 111 | 1137 gimple *stmt = gsi_stmt (gsi); |
| 0 | 1138 use_operand_p use_p; |
| 1139 | |
| 1140 if (check_modified_stmt && gimple_modified_p (stmt)) | |
| 1141 { | |
| 1142 error ("stmt (%p) marked modified after optimization pass: ", | |
| 1143 (void *)stmt); | |
| 1144 print_gimple_stmt (stderr, stmt, 0, TDF_VOPS); | |
| 1145 goto err; | |
| 1146 } | |
| 1147 | |
| 111 | 1148 if (check_ssa_operands && verify_ssa_operands (cfun, stmt)) |
| 0 | 1149 { |
| 111 | 1150 print_gimple_stmt (stderr, stmt, 0, TDF_VOPS); |
|
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1151 goto err; |
| 0 | 1152 } |
| 1153 | |
| 111 | 1154 if (gimple_debug_bind_p (stmt) |
| 1155 && !gimple_debug_bind_has_value_p (stmt)) | |
| 1156 continue; | |
| 0 | 1157 |
| 1158 FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_USE|SSA_OP_VUSE) | |
| 1159 { | |
| 1160 op = USE_FROM_PTR (use_p); | |
| 1161 if (verify_use (bb, definition_block[SSA_NAME_VERSION (op)], | |
| 1162 use_p, stmt, false, names_defined_in_bb)) | |
| 1163 goto err; | |
| 1164 } | |
| 1165 | |
| 1166 FOR_EACH_SSA_TREE_OPERAND (op, stmt, iter, SSA_OP_ALL_DEFS) | |
|
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1167 { |
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1168 if (SSA_NAME_DEF_STMT (op) != stmt) |
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1169 { |
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1170 error ("SSA_NAME_DEF_STMT is wrong"); |
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1171 fprintf (stderr, "Expected definition statement:\n"); |
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1172 print_gimple_stmt (stderr, stmt, 4, TDF_VOPS); |
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1173 fprintf (stderr, "\nActual definition statement:\n"); |
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1174 print_gimple_stmt (stderr, SSA_NAME_DEF_STMT (op), |
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1175 4, TDF_VOPS); |
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1176 goto err; |
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1177 } |
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1178 bitmap_set_bit (names_defined_in_bb, SSA_NAME_VERSION (op)); |
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1179 } |
| 0 | 1180 } |
| 1181 | |
| 1182 bitmap_clear (names_defined_in_bb); | |
| 1183 } | |
| 1184 | |
| 1185 free (definition_block); | |
| 1186 | |
| 111 | 1187 if (gimple_vop (cfun) |
| 1188 && ssa_default_def (cfun, gimple_vop (cfun))) | |
| 1189 { | |
| 1190 auto_sbitmap visited (last_basic_block_for_fn (cfun) + 1); | |
| 1191 bitmap_clear (visited); | |
| 1192 if (verify_vssa (ENTRY_BLOCK_PTR_FOR_FN (cfun), | |
| 1193 ssa_default_def (cfun, gimple_vop (cfun)), visited)) | |
| 1194 goto err; | |
| 1195 } | |
| 1196 | |
| 0 | 1197 /* Restore the dominance information to its prior known state, so |
| 1198 that we do not perturb the compiler's subsequent behavior. */ | |
| 1199 if (orig_dom_state == DOM_NONE) | |
| 1200 free_dominance_info (CDI_DOMINATORS); | |
| 1201 else | |
| 1202 set_dom_info_availability (CDI_DOMINATORS, orig_dom_state); | |
|
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|
1203 |
| 0 | 1204 timevar_pop (TV_TREE_SSA_VERIFY); |
| 1205 return; | |
| 1206 | |
| 1207 err: | |
| 1208 internal_error ("verify_ssa failed"); | |
| 1209 } | |
| 1210 | |
| 145 | 1211 #if __GNUC__ >= 10 |
| 1212 # pragma GCC diagnostic pop | |
| 1213 #endif | |
| 0 | 1214 |
| 1215 /* Initialize global DFA and SSA structures. */ | |
| 1216 | |
| 1217 void | |
| 1218 init_tree_ssa (struct function *fn) | |
| 1219 { | |
| 111 | 1220 fn->gimple_df = ggc_cleared_alloc<gimple_df> (); |
| 1221 fn->gimple_df->default_defs = hash_table<ssa_name_hasher>::create_ggc (20); | |
|
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|
1222 pt_solution_reset (&fn->gimple_df->escaped); |
| 0 | 1223 init_ssanames (fn, 0); |
| 1224 } | |
| 1225 | |
| 1226 /* Deallocate memory associated with SSA data structures for FNDECL. */ | |
| 1227 | |
| 1228 void | |
| 111 | 1229 delete_tree_ssa (struct function *fn) |
| 0 | 1230 { |
| 111 | 1231 fini_ssanames (fn); |
| 0 | 1232 |
| 1233 /* We no longer maintain the SSA operand cache at this point. */ | |
| 111 | 1234 if (ssa_operands_active (fn)) |
| 1235 fini_ssa_operands (fn); | |
|
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|
1236 |
| 111 | 1237 fn->gimple_df->default_defs->empty (); |
| 1238 fn->gimple_df->default_defs = NULL; | |
| 1239 pt_solution_reset (&fn->gimple_df->escaped); | |
| 1240 if (fn->gimple_df->decls_to_pointers != NULL) | |
| 1241 delete fn->gimple_df->decls_to_pointers; | |
| 1242 fn->gimple_df->decls_to_pointers = NULL; | |
| 1243 fn->gimple_df = NULL; | |
| 0 | 1244 |
| 1245 /* We no longer need the edge variable maps. */ | |
| 111 | 1246 redirect_edge_var_map_empty (); |
| 0 | 1247 } |
| 1248 | |
| 1249 /* Return true if EXPR is a useless type conversion, otherwise return | |
| 1250 false. */ | |
| 1251 | |
| 1252 bool | |
| 1253 tree_ssa_useless_type_conversion (tree expr) | |
| 1254 { | |
| 1255 /* If we have an assignment that merely uses a NOP_EXPR to change | |
| 1256 the top of the RHS to the type of the LHS and the type conversion | |
| 1257 is "safe", then strip away the type conversion so that we can | |
| 1258 enter LHS = RHS into the const_and_copies table. */ | |
| 1259 if (CONVERT_EXPR_P (expr) | |
| 1260 || TREE_CODE (expr) == VIEW_CONVERT_EXPR | |
| 1261 || TREE_CODE (expr) == NON_LVALUE_EXPR) | |
| 1262 return useless_type_conversion_p | |
| 1263 (TREE_TYPE (expr), | |
| 1264 TREE_TYPE (TREE_OPERAND (expr, 0))); | |
| 1265 | |
| 1266 return false; | |
| 1267 } | |
| 1268 | |
|
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1269 /* Strip conversions from EXP according to |
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1270 tree_ssa_useless_type_conversion and return the resulting |
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1271 expression. */ |
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1272 |
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1273 tree |
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1274 tree_ssa_strip_useless_type_conversions (tree exp) |
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1275 { |
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1276 while (tree_ssa_useless_type_conversion (exp)) |
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1277 exp = TREE_OPERAND (exp, 0); |
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1278 return exp; |
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1279 } |
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1280 |
| 111 | 1281 /* Return true if T, as SSA_NAME, has an implicit default defined value. */ |
|
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|
1282 |
| 111 | 1283 bool |
| 1284 ssa_defined_default_def_p (tree t) | |
| 1285 { | |
| 1286 tree var = SSA_NAME_VAR (t); | |
| 0 | 1287 |
| 111 | 1288 if (!var) |
| 1289 ; | |
| 1290 /* Parameters get their initial value from the function entry. */ | |
| 1291 else if (TREE_CODE (var) == PARM_DECL) | |
| 1292 return true; | |
| 1293 /* When returning by reference the return address is actually a hidden | |
| 1294 parameter. */ | |
| 1295 else if (TREE_CODE (var) == RESULT_DECL && DECL_BY_REFERENCE (var)) | |
| 1296 return true; | |
| 1297 /* Hard register variables get their initial value from the ether. */ | |
| 1298 else if (VAR_P (var) && DECL_HARD_REGISTER (var)) | |
| 1299 return true; | |
| 0 | 1300 |
| 111 | 1301 return false; |
| 1302 } | |
| 1303 | |
| 1304 | |
| 1305 /* Return true if T, an SSA_NAME, has an undefined value. PARTIAL is what | |
| 1306 should be returned if the value is only partially undefined. */ | |
| 1307 | |
| 1308 bool | |
| 1309 ssa_undefined_value_p (tree t, bool partial) | |
| 0 | 1310 { |
| 111 | 1311 gimple *def_stmt; |
| 0 | 1312 |
| 111 | 1313 if (ssa_defined_default_def_p (t)) |
| 0 | 1314 return false; |
| 1315 | |
| 111 | 1316 /* The value is undefined iff its definition statement is empty. */ |
| 1317 def_stmt = SSA_NAME_DEF_STMT (t); | |
| 1318 if (gimple_nop_p (def_stmt)) | |
| 1319 return true; | |
| 0 | 1320 |
| 111 | 1321 /* Check if the complex was not only partially defined. */ |
| 1322 if (partial && is_gimple_assign (def_stmt) | |
| 1323 && gimple_assign_rhs_code (def_stmt) == COMPLEX_EXPR) | |
| 0 | 1324 { |
| 111 | 1325 tree rhs1, rhs2; |
| 0 | 1326 |
| 111 | 1327 rhs1 = gimple_assign_rhs1 (def_stmt); |
| 1328 rhs2 = gimple_assign_rhs2 (def_stmt); | |
| 1329 return (TREE_CODE (rhs1) == SSA_NAME && ssa_undefined_value_p (rhs1)) | |
| 1330 || (TREE_CODE (rhs2) == SSA_NAME && ssa_undefined_value_p (rhs2)); | |
| 1331 } | |
| 1332 return false; | |
| 1333 } | |
| 1334 | |
| 0 | 1335 |
| 111 | 1336 /* Return TRUE iff STMT, a gimple statement, references an undefined |
| 1337 SSA name. */ | |
| 0 | 1338 |
| 111 | 1339 bool |
| 1340 gimple_uses_undefined_value_p (gimple *stmt) | |
| 1341 { | |
| 1342 ssa_op_iter iter; | |
| 1343 tree op; | |
| 1344 | |
| 1345 FOR_EACH_SSA_TREE_OPERAND (op, stmt, iter, SSA_OP_USE) | |
| 1346 if (ssa_undefined_value_p (op)) | |
| 1347 return true; | |
|
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1348 |
| 0 | 1349 return false; |
| 1350 } | |
|
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|
1351 |
| 0 | 1352 |
| 1353 | |
|
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1354 /* If necessary, rewrite the base of the reference tree *TP from |
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1355 a MEM_REF to a plain or converted symbol. */ |
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1356 |
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1357 static void |
| 111 | 1358 maybe_rewrite_mem_ref_base (tree *tp, bitmap suitable_for_renaming) |
|
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1359 { |
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1360 tree sym; |
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1361 |
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1362 while (handled_component_p (*tp)) |
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1363 tp = &TREE_OPERAND (*tp, 0); |
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1364 if (TREE_CODE (*tp) == MEM_REF |
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1365 && TREE_CODE (TREE_OPERAND (*tp, 0)) == ADDR_EXPR |
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1366 && (sym = TREE_OPERAND (TREE_OPERAND (*tp, 0), 0)) |
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1367 && DECL_P (sym) |
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1368 && !TREE_ADDRESSABLE (sym) |
| 111 | 1369 && bitmap_bit_p (suitable_for_renaming, DECL_UID (sym)) |
| 1370 && is_gimple_reg_type (TREE_TYPE (*tp)) | |
| 1371 && ! VOID_TYPE_P (TREE_TYPE (*tp))) | |
|
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1372 { |
| 111 | 1373 if (TREE_CODE (TREE_TYPE (sym)) == VECTOR_TYPE |
| 1374 && useless_type_conversion_p (TREE_TYPE (*tp), | |
| 1375 TREE_TYPE (TREE_TYPE (sym))) | |
| 1376 && multiple_of_p (sizetype, TREE_OPERAND (*tp, 1), | |
| 1377 TYPE_SIZE_UNIT (TREE_TYPE (*tp)))) | |
| 1378 { | |
| 1379 *tp = build3 (BIT_FIELD_REF, TREE_TYPE (*tp), sym, | |
| 1380 TYPE_SIZE (TREE_TYPE (*tp)), | |
| 1381 int_const_binop (MULT_EXPR, | |
| 1382 bitsize_int (BITS_PER_UNIT), | |
| 1383 TREE_OPERAND (*tp, 1))); | |
| 1384 } | |
| 1385 else if (TREE_CODE (TREE_TYPE (sym)) == COMPLEX_TYPE | |
| 1386 && useless_type_conversion_p (TREE_TYPE (*tp), | |
| 1387 TREE_TYPE (TREE_TYPE (sym)))) | |
| 1388 { | |
| 1389 *tp = build1 (integer_zerop (TREE_OPERAND (*tp, 1)) | |
| 1390 ? REALPART_EXPR : IMAGPART_EXPR, | |
|
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1391 TREE_TYPE (*tp), sym); |
| 111 | 1392 } |
| 1393 else if (integer_zerop (TREE_OPERAND (*tp, 1)) | |
| 1394 && DECL_SIZE (sym) == TYPE_SIZE (TREE_TYPE (*tp))) | |
| 1395 { | |
| 1396 if (!useless_type_conversion_p (TREE_TYPE (*tp), | |
| 1397 TREE_TYPE (sym))) | |
| 1398 *tp = build1 (VIEW_CONVERT_EXPR, | |
| 1399 TREE_TYPE (*tp), sym); | |
| 1400 else | |
| 1401 *tp = sym; | |
| 1402 } | |
| 1403 else if (DECL_SIZE (sym) | |
| 1404 && TREE_CODE (DECL_SIZE (sym)) == INTEGER_CST | |
| 131 | 1405 && (known_subrange_p |
| 1406 (mem_ref_offset (*tp), | |
| 1407 wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (*tp))), | |
| 1408 0, wi::to_offset (DECL_SIZE_UNIT (sym)))) | |
| 111 | 1409 && (! INTEGRAL_TYPE_P (TREE_TYPE (*tp)) |
| 1410 || (wi::to_offset (TYPE_SIZE (TREE_TYPE (*tp))) | |
| 1411 == TYPE_PRECISION (TREE_TYPE (*tp)))) | |
| 1412 && wi::umod_trunc (wi::to_offset (TYPE_SIZE (TREE_TYPE (*tp))), | |
| 1413 BITS_PER_UNIT) == 0) | |
| 1414 { | |
| 1415 *tp = build3 (BIT_FIELD_REF, TREE_TYPE (*tp), sym, | |
| 1416 TYPE_SIZE (TREE_TYPE (*tp)), | |
| 1417 wide_int_to_tree (bitsizetype, | |
| 1418 mem_ref_offset (*tp) | |
| 1419 << LOG2_BITS_PER_UNIT)); | |
| 1420 } | |
|
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1421 } |
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1422 } |
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1423 |
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1424 /* For a tree REF return its base if it is the base of a MEM_REF |
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1425 that cannot be rewritten into SSA form. Otherwise return NULL_TREE. */ |
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1426 |
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1427 static tree |
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1428 non_rewritable_mem_ref_base (tree ref) |
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1429 { |
| 111 | 1430 tree base; |
|
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1431 |
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1432 /* A plain decl does not need it set. */ |
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1433 if (DECL_P (ref)) |
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1434 return NULL_TREE; |
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1435 |
| 111 | 1436 if (! (base = CONST_CAST_TREE (strip_invariant_refs (ref)))) |
| 1437 { | |
| 1438 base = get_base_address (ref); | |
| 1439 if (DECL_P (base)) | |
| 1440 return base; | |
| 1441 return NULL_TREE; | |
| 1442 } | |
|
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1443 |
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1444 /* But watch out for MEM_REFs we cannot lower to a |
| 111 | 1445 VIEW_CONVERT_EXPR or a BIT_FIELD_REF. */ |
|
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1446 if (TREE_CODE (base) == MEM_REF |
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1447 && TREE_CODE (TREE_OPERAND (base, 0)) == ADDR_EXPR) |
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1448 { |
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1449 tree decl = TREE_OPERAND (TREE_OPERAND (base, 0), 0); |
| 111 | 1450 if (! DECL_P (decl)) |
| 1451 return NULL_TREE; | |
| 1452 if (! is_gimple_reg_type (TREE_TYPE (base)) | |
| 131 | 1453 || VOID_TYPE_P (TREE_TYPE (base)) |
| 1454 || TREE_THIS_VOLATILE (decl) != TREE_THIS_VOLATILE (base)) | |
|
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1455 return decl; |
| 111 | 1456 if ((TREE_CODE (TREE_TYPE (decl)) == VECTOR_TYPE |
| 1457 || TREE_CODE (TREE_TYPE (decl)) == COMPLEX_TYPE) | |
| 1458 && useless_type_conversion_p (TREE_TYPE (base), | |
| 1459 TREE_TYPE (TREE_TYPE (decl))) | |
| 131 | 1460 && known_ge (mem_ref_offset (base), 0) |
| 1461 && known_gt (wi::to_poly_offset (TYPE_SIZE_UNIT (TREE_TYPE (decl))), | |
| 1462 mem_ref_offset (base)) | |
| 111 | 1463 && multiple_of_p (sizetype, TREE_OPERAND (base, 1), |
| 1464 TYPE_SIZE_UNIT (TREE_TYPE (base)))) | |
| 1465 return NULL_TREE; | |
| 1466 /* For same sizes and zero offset we can use a VIEW_CONVERT_EXPR. */ | |
| 1467 if (integer_zerop (TREE_OPERAND (base, 1)) | |
| 1468 && DECL_SIZE (decl) == TYPE_SIZE (TREE_TYPE (base))) | |
| 1469 return NULL_TREE; | |
| 1470 /* For integral typed extracts we can use a BIT_FIELD_REF. */ | |
| 1471 if (DECL_SIZE (decl) | |
| 145 | 1472 && TREE_CODE (DECL_SIZE_UNIT (decl)) == INTEGER_CST |
| 131 | 1473 && (known_subrange_p |
| 1474 (mem_ref_offset (base), | |
| 1475 wi::to_poly_offset (TYPE_SIZE_UNIT (TREE_TYPE (base))), | |
| 1476 0, wi::to_poly_offset (DECL_SIZE_UNIT (decl)))) | |
| 111 | 1477 /* ??? We can't handle bitfield precision extracts without |
| 1478 either using an alternate type for the BIT_FIELD_REF and | |
| 1479 then doing a conversion or possibly adjusting the offset | |
| 1480 according to endianness. */ | |
| 1481 && (! INTEGRAL_TYPE_P (TREE_TYPE (base)) | |
| 1482 || (wi::to_offset (TYPE_SIZE (TREE_TYPE (base))) | |
| 1483 == TYPE_PRECISION (TREE_TYPE (base)))) | |
| 1484 && wi::umod_trunc (wi::to_offset (TYPE_SIZE (TREE_TYPE (base))), | |
| 1485 BITS_PER_UNIT) == 0) | |
| 1486 return NULL_TREE; | |
| 1487 return decl; | |
|
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1488 } |
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1489 |
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1490 return NULL_TREE; |
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1491 } |
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1492 |
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1493 /* For an lvalue tree LHS return true if it cannot be rewritten into SSA form. |
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1494 Otherwise return true. */ |
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1495 |
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1496 static bool |
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1497 non_rewritable_lvalue_p (tree lhs) |
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1498 { |
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1499 /* A plain decl is always rewritable. */ |
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1500 if (DECL_P (lhs)) |
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1501 return false; |
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1502 |
| 111 | 1503 /* We can re-write REALPART_EXPR and IMAGPART_EXPR sets in |
| 1504 a reasonably efficient manner... */ | |
| 1505 if ((TREE_CODE (lhs) == REALPART_EXPR | |
| 1506 || TREE_CODE (lhs) == IMAGPART_EXPR) | |
| 1507 && DECL_P (TREE_OPERAND (lhs, 0))) | |
| 1508 return false; | |
| 1509 | |
| 1510 /* ??? The following could be relaxed allowing component | |
|
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1511 references that do not change the access size. */ |
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1512 if (TREE_CODE (lhs) == MEM_REF |
| 111 | 1513 && TREE_CODE (TREE_OPERAND (lhs, 0)) == ADDR_EXPR) |
|
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1514 { |
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1515 tree decl = TREE_OPERAND (TREE_OPERAND (lhs, 0), 0); |
| 111 | 1516 |
| 1517 /* A decl that is wrapped inside a MEM-REF that covers | |
| 1518 it full is also rewritable. */ | |
| 1519 if (integer_zerop (TREE_OPERAND (lhs, 1)) | |
| 1520 && DECL_P (decl) | |
|
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1521 && DECL_SIZE (decl) == TYPE_SIZE (TREE_TYPE (lhs)) |
| 111 | 1522 /* If the dynamic type of the decl has larger precision than |
| 1523 the decl itself we can't use the decls type for SSA rewriting. */ | |
| 1524 && ((! INTEGRAL_TYPE_P (TREE_TYPE (decl)) | |
| 1525 || compare_tree_int (DECL_SIZE (decl), | |
| 1526 TYPE_PRECISION (TREE_TYPE (decl))) == 0) | |
| 1527 || (INTEGRAL_TYPE_P (TREE_TYPE (lhs)) | |
| 1528 && (TYPE_PRECISION (TREE_TYPE (decl)) | |
| 1529 >= TYPE_PRECISION (TREE_TYPE (lhs))))) | |
| 1530 /* Make sure we are not re-writing non-float copying into float | |
| 1531 copying as that can incur normalization. */ | |
| 1532 && (! FLOAT_TYPE_P (TREE_TYPE (decl)) | |
| 1533 || types_compatible_p (TREE_TYPE (lhs), TREE_TYPE (decl))) | |
|
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1534 && (TREE_THIS_VOLATILE (decl) == TREE_THIS_VOLATILE (lhs))) |
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1535 return false; |
| 111 | 1536 |
| 1537 /* A vector-insert using a MEM_REF or ARRAY_REF is rewritable | |
| 1538 using a BIT_INSERT_EXPR. */ | |
| 1539 if (DECL_P (decl) | |
| 1540 && VECTOR_TYPE_P (TREE_TYPE (decl)) | |
| 1541 && TYPE_MODE (TREE_TYPE (decl)) != BLKmode | |
| 131 | 1542 && known_ge (mem_ref_offset (lhs), 0) |
| 1543 && known_gt (wi::to_poly_offset (TYPE_SIZE_UNIT (TREE_TYPE (decl))), | |
| 1544 mem_ref_offset (lhs)) | |
| 1545 && multiple_of_p (sizetype, TREE_OPERAND (lhs, 1), | |
| 1546 TYPE_SIZE_UNIT (TREE_TYPE (lhs)))) | |
| 145 | 1547 { |
| 1548 poly_uint64 lhs_bits, nelts; | |
| 1549 if (poly_int_tree_p (TYPE_SIZE (TREE_TYPE (lhs)), &lhs_bits) | |
| 1550 && multiple_p (lhs_bits, | |
| 1551 tree_to_uhwi | |
| 1552 (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl)))), | |
| 1553 &nelts)) | |
| 1554 { | |
| 1555 if (known_eq (nelts, 1u)) | |
| 1556 return false; | |
| 1557 /* For sub-vector inserts the insert vector mode has to be | |
| 1558 supported. */ | |
| 1559 tree vtype = build_vector_type (TREE_TYPE (TREE_TYPE (decl)), | |
| 1560 nelts); | |
| 1561 if (TYPE_MODE (vtype) != BLKmode) | |
| 1562 return false; | |
| 1563 } | |
| 1564 } | |
|
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1565 } |
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1566 |
| 111 | 1567 /* A vector-insert using a BIT_FIELD_REF is rewritable using |
| 1568 BIT_INSERT_EXPR. */ | |
| 1569 if (TREE_CODE (lhs) == BIT_FIELD_REF | |
| 1570 && DECL_P (TREE_OPERAND (lhs, 0)) | |
| 1571 && VECTOR_TYPE_P (TREE_TYPE (TREE_OPERAND (lhs, 0))) | |
| 1572 && TYPE_MODE (TREE_TYPE (TREE_OPERAND (lhs, 0))) != BLKmode | |
| 1573 && operand_equal_p (TYPE_SIZE_UNIT (TREE_TYPE (lhs)), | |
| 1574 TYPE_SIZE_UNIT | |
| 1575 (TREE_TYPE (TREE_TYPE (TREE_OPERAND (lhs, 0)))), 0) | |
| 1576 && (tree_to_uhwi (TREE_OPERAND (lhs, 2)) | |
| 1577 % tree_to_uhwi (TYPE_SIZE (TREE_TYPE (lhs)))) == 0) | |
| 1578 return false; | |
| 1579 | |
|
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1580 return true; |
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1581 } |
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1582 |
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1583 /* When possible, clear TREE_ADDRESSABLE bit or set DECL_GIMPLE_REG_P bit and |
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1584 mark the variable VAR for conversion into SSA. Return true when updating |
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1585 stmts is required. */ |
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1586 |
| 111 | 1587 static void |
| 1588 maybe_optimize_var (tree var, bitmap addresses_taken, bitmap not_reg_needs, | |
| 1589 bitmap suitable_for_renaming) | |
|
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1590 { |
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1591 /* Global Variables, result decls cannot be changed. */ |
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1592 if (is_global_var (var) |
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1593 || TREE_CODE (var) == RESULT_DECL |
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1594 || bitmap_bit_p (addresses_taken, DECL_UID (var))) |
| 111 | 1595 return; |
|
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1596 |
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1597 if (TREE_ADDRESSABLE (var) |
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1598 /* Do not change TREE_ADDRESSABLE if we need to preserve var as |
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1599 a non-register. Otherwise we are confused and forget to |
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1600 add virtual operands for it. */ |
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1601 && (!is_gimple_reg_type (TREE_TYPE (var)) |
| 111 | 1602 || TREE_CODE (TREE_TYPE (var)) == VECTOR_TYPE |
| 1603 || TREE_CODE (TREE_TYPE (var)) == COMPLEX_TYPE | |
|
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1604 || !bitmap_bit_p (not_reg_needs, DECL_UID (var)))) |
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1605 { |
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1606 TREE_ADDRESSABLE (var) = 0; |
| 131 | 1607 /* If we cleared TREE_ADDRESSABLE make sure DECL_GIMPLE_REG_P |
| 1608 is unset if we cannot rewrite the var into SSA. */ | |
| 1609 if ((TREE_CODE (TREE_TYPE (var)) == VECTOR_TYPE | |
| 1610 || TREE_CODE (TREE_TYPE (var)) == COMPLEX_TYPE) | |
| 1611 && bitmap_bit_p (not_reg_needs, DECL_UID (var))) | |
| 1612 DECL_GIMPLE_REG_P (var) = 0; | |
|
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1613 if (is_gimple_reg (var)) |
| 111 | 1614 bitmap_set_bit (suitable_for_renaming, DECL_UID (var)); |
|
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1615 if (dump_file) |
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1616 { |
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1617 fprintf (dump_file, "No longer having address taken: "); |
| 111 | 1618 print_generic_expr (dump_file, var); |
|
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1619 fprintf (dump_file, "\n"); |
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1620 } |
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1621 } |
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1622 |
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1623 if (!DECL_GIMPLE_REG_P (var) |
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1624 && !bitmap_bit_p (not_reg_needs, DECL_UID (var)) |
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1625 && (TREE_CODE (TREE_TYPE (var)) == COMPLEX_TYPE |
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1626 || TREE_CODE (TREE_TYPE (var)) == VECTOR_TYPE) |
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1627 && !TREE_THIS_VOLATILE (var) |
| 111 | 1628 && (!VAR_P (var) || !DECL_HARD_REGISTER (var))) |
|
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1629 { |
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1630 DECL_GIMPLE_REG_P (var) = 1; |
| 111 | 1631 bitmap_set_bit (suitable_for_renaming, DECL_UID (var)); |
|
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1632 if (dump_file) |
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1633 { |
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1634 fprintf (dump_file, "Now a gimple register: "); |
| 111 | 1635 print_generic_expr (dump_file, var); |
|
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1636 fprintf (dump_file, "\n"); |
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1637 } |
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1638 } |
| 111 | 1639 } |
|
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1640 |
| 111 | 1641 /* Return true when STMT is ASAN mark where second argument is an address |
| 1642 of a local variable. */ | |
| 1643 | |
| 1644 static bool | |
| 1645 is_asan_mark_p (gimple *stmt) | |
| 1646 { | |
| 1647 if (!gimple_call_internal_p (stmt, IFN_ASAN_MARK)) | |
| 1648 return false; | |
| 1649 | |
| 1650 tree addr = get_base_address (gimple_call_arg (stmt, 1)); | |
| 1651 if (TREE_CODE (addr) == ADDR_EXPR | |
| 1652 && VAR_P (TREE_OPERAND (addr, 0))) | |
| 1653 { | |
| 1654 tree var = TREE_OPERAND (addr, 0); | |
| 1655 if (lookup_attribute (ASAN_USE_AFTER_SCOPE_ATTRIBUTE, | |
| 1656 DECL_ATTRIBUTES (var))) | |
| 1657 return false; | |
| 1658 | |
| 1659 unsigned addressable = TREE_ADDRESSABLE (var); | |
| 1660 TREE_ADDRESSABLE (var) = 0; | |
| 1661 bool r = is_gimple_reg (var); | |
| 1662 TREE_ADDRESSABLE (var) = addressable; | |
| 1663 return r; | |
| 1664 } | |
| 1665 | |
| 1666 return false; | |
|
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1667 } |
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1668 |
| 0 | 1669 /* Compute TREE_ADDRESSABLE and DECL_GIMPLE_REG_P for local variables. */ |
| 1670 | |
|
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1671 void |
|
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1672 execute_update_addresses_taken (void) |
| 0 | 1673 { |
| 1674 basic_block bb; | |
| 111 | 1675 auto_bitmap addresses_taken; |
| 1676 auto_bitmap not_reg_needs; | |
| 1677 auto_bitmap suitable_for_renaming; | |
|
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1678 tree var; |
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1679 unsigned i; |
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1680 |
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1681 timevar_push (TV_ADDRESS_TAKEN); |
| 0 | 1682 |
| 1683 /* Collect into ADDRESSES_TAKEN all variables whose address is taken within | |
| 1684 the function body. */ | |
| 111 | 1685 FOR_EACH_BB_FN (bb, cfun) |
| 0 | 1686 { |
| 111 | 1687 for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi); |
| 1688 gsi_next (&gsi)) | |
| 0 | 1689 { |
| 111 | 1690 gimple *stmt = gsi_stmt (gsi); |
| 0 | 1691 enum gimple_code code = gimple_code (stmt); |
|
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1692 tree decl; |
|
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1693 |
| 111 | 1694 if (code == GIMPLE_CALL) |
| 1695 { | |
| 1696 if (optimize_atomic_compare_exchange_p (stmt)) | |
| 1697 { | |
| 1698 /* For __atomic_compare_exchange_N if the second argument | |
| 1699 is &var, don't mark var addressable; | |
| 1700 if it becomes non-addressable, we'll rewrite it into | |
| 1701 ATOMIC_COMPARE_EXCHANGE call. */ | |
| 1702 tree arg = gimple_call_arg (stmt, 1); | |
| 1703 gimple_call_set_arg (stmt, 1, null_pointer_node); | |
| 1704 gimple_ior_addresses_taken (addresses_taken, stmt); | |
| 1705 gimple_call_set_arg (stmt, 1, arg); | |
| 1706 } | |
| 1707 else if (is_asan_mark_p (stmt) | |
| 1708 || gimple_call_internal_p (stmt, IFN_GOMP_SIMT_ENTER)) | |
| 1709 ; | |
| 1710 else | |
| 1711 gimple_ior_addresses_taken (addresses_taken, stmt); | |
| 1712 } | |
| 1713 else | |
| 1714 /* Note all addresses taken by the stmt. */ | |
| 1715 gimple_ior_addresses_taken (addresses_taken, stmt); | |
|
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1716 |
| 0 | 1717 /* If we have a call or an assignment, see if the lhs contains |
| 1718 a local decl that requires not to be a gimple register. */ | |
| 1719 if (code == GIMPLE_ASSIGN || code == GIMPLE_CALL) | |
| 1720 { | |
|
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1721 tree lhs = gimple_get_lhs (stmt); |
|
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1722 if (lhs |
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1723 && TREE_CODE (lhs) != SSA_NAME |
| 111 | 1724 && ((code == GIMPLE_CALL && ! DECL_P (lhs)) |
| 1725 || non_rewritable_lvalue_p (lhs))) | |
|
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1726 { |
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1727 decl = get_base_address (lhs); |
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1728 if (DECL_P (decl)) |
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1729 bitmap_set_bit (not_reg_needs, DECL_UID (decl)); |
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1730 } |
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1731 } |
|
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1732 |
|
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1733 if (gimple_assign_single_p (stmt)) |
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1734 { |
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1735 tree rhs = gimple_assign_rhs1 (stmt); |
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1736 if ((decl = non_rewritable_mem_ref_base (rhs))) |
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1737 bitmap_set_bit (not_reg_needs, DECL_UID (decl)); |
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1738 } |
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1739 |
|
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1740 else if (code == GIMPLE_CALL) |
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1741 { |
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1742 for (i = 0; i < gimple_call_num_args (stmt); ++i) |
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1743 { |
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1744 tree arg = gimple_call_arg (stmt, i); |
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1745 if ((decl = non_rewritable_mem_ref_base (arg))) |
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1746 bitmap_set_bit (not_reg_needs, DECL_UID (decl)); |
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1747 } |
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1748 } |
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1749 |
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1750 else if (code == GIMPLE_ASM) |
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1751 { |
| 111 | 1752 gasm *asm_stmt = as_a <gasm *> (stmt); |
| 1753 for (i = 0; i < gimple_asm_noutputs (asm_stmt); ++i) | |
|
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1754 { |
| 111 | 1755 tree link = gimple_asm_output_op (asm_stmt, i); |
|
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1756 tree lhs = TREE_VALUE (link); |
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1757 if (TREE_CODE (lhs) != SSA_NAME) |
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1758 { |
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1759 decl = get_base_address (lhs); |
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1760 if (DECL_P (decl) |
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1761 && (non_rewritable_lvalue_p (lhs) |
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1762 /* We cannot move required conversions from |
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1763 the lhs to the rhs in asm statements, so |
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1764 require we do not need any. */ |
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1765 || !useless_type_conversion_p |
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1766 (TREE_TYPE (lhs), TREE_TYPE (decl)))) |
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1767 bitmap_set_bit (not_reg_needs, DECL_UID (decl)); |
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1768 } |
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1769 } |
| 111 | 1770 for (i = 0; i < gimple_asm_ninputs (asm_stmt); ++i) |
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1771 { |
| 111 | 1772 tree link = gimple_asm_input_op (asm_stmt, i); |
|
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1773 if ((decl = non_rewritable_mem_ref_base (TREE_VALUE (link)))) |
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1774 bitmap_set_bit (not_reg_needs, DECL_UID (decl)); |
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1775 } |
| 0 | 1776 } |
| 1777 } | |
| 1778 | |
| 111 | 1779 for (gphi_iterator gsi = gsi_start_phis (bb); !gsi_end_p (gsi); |
| 1780 gsi_next (&gsi)) | |
| 0 | 1781 { |
| 1782 size_t i; | |
| 111 | 1783 gphi *phi = gsi.phi (); |
| 0 | 1784 |
| 1785 for (i = 0; i < gimple_phi_num_args (phi); i++) | |
| 1786 { | |
| 1787 tree op = PHI_ARG_DEF (phi, i), var; | |
| 1788 if (TREE_CODE (op) == ADDR_EXPR | |
| 1789 && (var = get_base_address (TREE_OPERAND (op, 0))) != NULL | |
| 1790 && DECL_P (var)) | |
| 1791 bitmap_set_bit (addresses_taken, DECL_UID (var)); | |
| 1792 } | |
| 1793 } | |
| 1794 } | |
| 1795 | |
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1796 /* We cannot iterate over all referenced vars because that can contain |
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1797 unused vars from BLOCK trees, which causes code generation differences |
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1798 for -g vs. -g0. */ |
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1799 for (var = DECL_ARGUMENTS (cfun->decl); var; var = DECL_CHAIN (var)) |
| 111 | 1800 maybe_optimize_var (var, addresses_taken, not_reg_needs, |
| 1801 suitable_for_renaming); | |
|
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1802 |
| 111 | 1803 FOR_EACH_VEC_SAFE_ELT (cfun->local_decls, i, var) |
| 1804 maybe_optimize_var (var, addresses_taken, not_reg_needs, | |
| 1805 suitable_for_renaming); | |
| 0 | 1806 |
|
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1807 /* Operand caches need to be recomputed for operands referencing the updated |
| 111 | 1808 variables and operands need to be rewritten to expose bare symbols. */ |
| 1809 if (!bitmap_empty_p (suitable_for_renaming)) | |
|
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1810 { |
| 111 | 1811 FOR_EACH_BB_FN (bb, cfun) |
| 1812 for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi);) | |
|
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1813 { |
| 111 | 1814 gimple *stmt = gsi_stmt (gsi); |
|
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1815 |
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1816 /* Re-write TARGET_MEM_REFs of symbols we want to |
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1817 rewrite into SSA form. */ |
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1818 if (gimple_assign_single_p (stmt)) |
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1819 { |
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1820 tree lhs = gimple_assign_lhs (stmt); |
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1821 tree rhs, *rhsp = gimple_assign_rhs1_ptr (stmt); |
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1822 tree sym; |
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1823 |
| 111 | 1824 /* Rewrite LHS IMAG/REALPART_EXPR similar to |
| 1825 gimplify_modify_expr_complex_part. */ | |
| 1826 if ((TREE_CODE (lhs) == IMAGPART_EXPR | |
| 1827 || TREE_CODE (lhs) == REALPART_EXPR) | |
| 1828 && DECL_P (TREE_OPERAND (lhs, 0)) | |
| 1829 && bitmap_bit_p (suitable_for_renaming, | |
| 1830 DECL_UID (TREE_OPERAND (lhs, 0)))) | |
| 1831 { | |
| 1832 tree other = make_ssa_name (TREE_TYPE (lhs)); | |
| 1833 tree lrhs = build1 (TREE_CODE (lhs) == IMAGPART_EXPR | |
| 1834 ? REALPART_EXPR : IMAGPART_EXPR, | |
| 1835 TREE_TYPE (other), | |
| 1836 TREE_OPERAND (lhs, 0)); | |
| 1837 gimple *load = gimple_build_assign (other, lrhs); | |
| 1838 location_t loc = gimple_location (stmt); | |
| 1839 gimple_set_location (load, loc); | |
| 1840 gimple_set_vuse (load, gimple_vuse (stmt)); | |
| 1841 gsi_insert_before (&gsi, load, GSI_SAME_STMT); | |
| 1842 gimple_assign_set_lhs (stmt, TREE_OPERAND (lhs, 0)); | |
| 1843 gimple_assign_set_rhs_with_ops | |
| 1844 (&gsi, COMPLEX_EXPR, | |
| 1845 TREE_CODE (lhs) == IMAGPART_EXPR | |
| 1846 ? other : gimple_assign_rhs1 (stmt), | |
| 1847 TREE_CODE (lhs) == IMAGPART_EXPR | |
| 1848 ? gimple_assign_rhs1 (stmt) : other, NULL_TREE); | |
| 1849 stmt = gsi_stmt (gsi); | |
| 1850 unlink_stmt_vdef (stmt); | |
| 1851 update_stmt (stmt); | |
| 1852 continue; | |
| 1853 } | |
| 1854 | |
| 1855 /* Rewrite a vector insert via a BIT_FIELD_REF on the LHS | |
| 1856 into a BIT_INSERT_EXPR. */ | |
| 1857 if (TREE_CODE (lhs) == BIT_FIELD_REF | |
| 1858 && DECL_P (TREE_OPERAND (lhs, 0)) | |
| 1859 && bitmap_bit_p (suitable_for_renaming, | |
| 1860 DECL_UID (TREE_OPERAND (lhs, 0))) | |
| 1861 && VECTOR_TYPE_P (TREE_TYPE (TREE_OPERAND (lhs, 0))) | |
| 1862 && TYPE_MODE (TREE_TYPE (TREE_OPERAND (lhs, 0))) != BLKmode | |
| 1863 && operand_equal_p (TYPE_SIZE_UNIT (TREE_TYPE (lhs)), | |
| 1864 TYPE_SIZE_UNIT (TREE_TYPE | |
| 1865 (TREE_TYPE (TREE_OPERAND (lhs, 0)))), | |
| 1866 0) | |
| 1867 && (tree_to_uhwi (TREE_OPERAND (lhs, 2)) | |
| 1868 % tree_to_uhwi (TYPE_SIZE (TREE_TYPE (lhs))) == 0)) | |
| 1869 { | |
| 1870 tree var = TREE_OPERAND (lhs, 0); | |
| 1871 tree val = gimple_assign_rhs1 (stmt); | |
| 1872 if (! types_compatible_p (TREE_TYPE (TREE_TYPE (var)), | |
| 1873 TREE_TYPE (val))) | |
| 1874 { | |
| 1875 tree tem = make_ssa_name (TREE_TYPE (TREE_TYPE (var))); | |
| 1876 gimple *pun | |
| 1877 = gimple_build_assign (tem, | |
| 1878 build1 (VIEW_CONVERT_EXPR, | |
| 1879 TREE_TYPE (tem), val)); | |
| 1880 gsi_insert_before (&gsi, pun, GSI_SAME_STMT); | |
| 1881 val = tem; | |
| 1882 } | |
| 1883 tree bitpos = TREE_OPERAND (lhs, 2); | |
| 1884 gimple_assign_set_lhs (stmt, var); | |
| 1885 gimple_assign_set_rhs_with_ops | |
| 1886 (&gsi, BIT_INSERT_EXPR, var, val, bitpos); | |
| 1887 stmt = gsi_stmt (gsi); | |
| 1888 unlink_stmt_vdef (stmt); | |
| 1889 update_stmt (stmt); | |
| 1890 continue; | |
| 1891 } | |
| 1892 | |
| 1893 /* Rewrite a vector insert using a MEM_REF on the LHS | |
| 1894 into a BIT_INSERT_EXPR. */ | |
| 1895 if (TREE_CODE (lhs) == MEM_REF | |
| 1896 && TREE_CODE (TREE_OPERAND (lhs, 0)) == ADDR_EXPR | |
| 1897 && (sym = TREE_OPERAND (TREE_OPERAND (lhs, 0), 0)) | |
| 1898 && DECL_P (sym) | |
| 1899 && bitmap_bit_p (suitable_for_renaming, DECL_UID (sym)) | |
| 1900 && VECTOR_TYPE_P (TREE_TYPE (sym)) | |
| 1901 && TYPE_MODE (TREE_TYPE (sym)) != BLKmode | |
| 145 | 1902 /* If it is a full replacement we can do better below. */ |
| 1903 && maybe_ne (wi::to_poly_offset | |
| 1904 (TYPE_SIZE_UNIT (TREE_TYPE (lhs))), | |
| 1905 wi::to_poly_offset | |
| 1906 (TYPE_SIZE_UNIT (TREE_TYPE (sym)))) | |
| 1907 && known_ge (mem_ref_offset (lhs), 0) | |
| 1908 && known_gt (wi::to_poly_offset | |
| 1909 (TYPE_SIZE_UNIT (TREE_TYPE (sym))), | |
| 1910 mem_ref_offset (lhs)) | |
| 1911 && multiple_of_p (sizetype, | |
| 1912 TREE_OPERAND (lhs, 1), | |
| 1913 TYPE_SIZE_UNIT (TREE_TYPE (lhs)))) | |
| 111 | 1914 { |
| 1915 tree val = gimple_assign_rhs1 (stmt); | |
| 1916 if (! types_compatible_p (TREE_TYPE (val), | |
| 1917 TREE_TYPE (TREE_TYPE (sym)))) | |
| 1918 { | |
| 145 | 1919 poly_uint64 lhs_bits, nelts; |
| 1920 tree temtype = TREE_TYPE (TREE_TYPE (sym)); | |
| 1921 if (poly_int_tree_p (TYPE_SIZE (TREE_TYPE (lhs)), | |
| 1922 &lhs_bits) | |
| 1923 && multiple_p (lhs_bits, | |
| 1924 tree_to_uhwi | |
| 1925 (TYPE_SIZE (TREE_TYPE | |
| 1926 (TREE_TYPE (sym)))), | |
| 1927 &nelts) | |
| 1928 && maybe_ne (nelts, 1u)) | |
| 1929 temtype = build_vector_type (temtype, nelts); | |
| 1930 tree tem = make_ssa_name (temtype); | |
| 111 | 1931 gimple *pun |
| 1932 = gimple_build_assign (tem, | |
| 1933 build1 (VIEW_CONVERT_EXPR, | |
| 1934 TREE_TYPE (tem), val)); | |
| 1935 gsi_insert_before (&gsi, pun, GSI_SAME_STMT); | |
| 1936 val = tem; | |
| 1937 } | |
| 1938 tree bitpos | |
| 1939 = wide_int_to_tree (bitsizetype, | |
| 1940 mem_ref_offset (lhs) * BITS_PER_UNIT); | |
| 1941 gimple_assign_set_lhs (stmt, sym); | |
| 1942 gimple_assign_set_rhs_with_ops | |
| 1943 (&gsi, BIT_INSERT_EXPR, sym, val, bitpos); | |
| 1944 stmt = gsi_stmt (gsi); | |
| 1945 unlink_stmt_vdef (stmt); | |
| 1946 update_stmt (stmt); | |
| 1947 continue; | |
| 1948 } | |
| 1949 | |
|
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1950 /* We shouldn't have any fancy wrapping of |
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1951 component-refs on the LHS, but look through |
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1952 VIEW_CONVERT_EXPRs as that is easy. */ |
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1953 while (TREE_CODE (lhs) == VIEW_CONVERT_EXPR) |
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1954 lhs = TREE_OPERAND (lhs, 0); |
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1955 if (TREE_CODE (lhs) == MEM_REF |
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1956 && TREE_CODE (TREE_OPERAND (lhs, 0)) == ADDR_EXPR |
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1957 && integer_zerop (TREE_OPERAND (lhs, 1)) |
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1958 && (sym = TREE_OPERAND (TREE_OPERAND (lhs, 0), 0)) |
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1959 && DECL_P (sym) |
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1960 && !TREE_ADDRESSABLE (sym) |
| 111 | 1961 && bitmap_bit_p (suitable_for_renaming, DECL_UID (sym))) |
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1962 lhs = sym; |
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1963 else |
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1964 lhs = gimple_assign_lhs (stmt); |
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1965 |
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1966 /* Rewrite the RHS and make sure the resulting assignment |
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1967 is validly typed. */ |
| 111 | 1968 maybe_rewrite_mem_ref_base (rhsp, suitable_for_renaming); |
|
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1969 rhs = gimple_assign_rhs1 (stmt); |
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1970 if (gimple_assign_lhs (stmt) != lhs |
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1971 && !useless_type_conversion_p (TREE_TYPE (lhs), |
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1972 TREE_TYPE (rhs))) |
| 111 | 1973 { |
| 1974 if (gimple_clobber_p (stmt)) | |
| 1975 { | |
| 1976 rhs = build_constructor (TREE_TYPE (lhs), NULL); | |
| 1977 TREE_THIS_VOLATILE (rhs) = 1; | |
| 1978 } | |
| 1979 else | |
| 1980 rhs = fold_build1 (VIEW_CONVERT_EXPR, | |
| 1981 TREE_TYPE (lhs), rhs); | |
| 1982 } | |
|
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1983 if (gimple_assign_lhs (stmt) != lhs) |
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1984 gimple_assign_set_lhs (stmt, lhs); |
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1985 |
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1986 if (gimple_assign_rhs1 (stmt) != rhs) |
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1987 { |
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1988 gimple_stmt_iterator gsi = gsi_for_stmt (stmt); |
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1989 gimple_assign_set_rhs_from_tree (&gsi, rhs); |
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1990 } |
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1991 } |
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1992 |
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1993 else if (gimple_code (stmt) == GIMPLE_CALL) |
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1994 { |
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1995 unsigned i; |
| 111 | 1996 if (optimize_atomic_compare_exchange_p (stmt)) |
| 1997 { | |
| 1998 tree expected = gimple_call_arg (stmt, 1); | |
| 1999 if (bitmap_bit_p (suitable_for_renaming, | |
| 2000 DECL_UID (TREE_OPERAND (expected, 0)))) | |
| 2001 { | |
| 2002 fold_builtin_atomic_compare_exchange (&gsi); | |
| 2003 continue; | |
| 2004 } | |
| 2005 } | |
| 2006 else if (is_asan_mark_p (stmt)) | |
| 2007 { | |
| 2008 tree var = TREE_OPERAND (gimple_call_arg (stmt, 1), 0); | |
| 2009 if (bitmap_bit_p (suitable_for_renaming, DECL_UID (var))) | |
| 2010 { | |
| 2011 unlink_stmt_vdef (stmt); | |
| 2012 if (asan_mark_p (stmt, ASAN_MARK_POISON)) | |
| 2013 { | |
| 2014 gcall *call | |
| 2015 = gimple_build_call_internal (IFN_ASAN_POISON, 0); | |
| 2016 gimple_call_set_lhs (call, var); | |
| 2017 gsi_replace (&gsi, call, GSI_SAME_STMT); | |
| 2018 } | |
| 2019 else | |
| 2020 { | |
| 2021 /* In ASAN_MARK (UNPOISON, &b, ...) the variable | |
| 2022 is uninitialized. Avoid dependencies on | |
| 2023 previous out of scope value. */ | |
| 145 | 2024 tree clobber = build_clobber (TREE_TYPE (var)); |
| 111 | 2025 gimple *g = gimple_build_assign (var, clobber); |
| 2026 gsi_replace (&gsi, g, GSI_SAME_STMT); | |
| 2027 } | |
| 2028 continue; | |
| 2029 } | |
| 2030 } | |
| 2031 else if (gimple_call_internal_p (stmt, IFN_GOMP_SIMT_ENTER)) | |
| 2032 for (i = 1; i < gimple_call_num_args (stmt); i++) | |
| 2033 { | |
| 2034 tree *argp = gimple_call_arg_ptr (stmt, i); | |
| 2035 if (*argp == null_pointer_node) | |
| 2036 continue; | |
| 2037 gcc_assert (TREE_CODE (*argp) == ADDR_EXPR | |
| 2038 && VAR_P (TREE_OPERAND (*argp, 0))); | |
| 2039 tree var = TREE_OPERAND (*argp, 0); | |
| 2040 if (bitmap_bit_p (suitable_for_renaming, DECL_UID (var))) | |
| 2041 *argp = null_pointer_node; | |
| 2042 } | |
|
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2043 for (i = 0; i < gimple_call_num_args (stmt); ++i) |
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2044 { |
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2045 tree *argp = gimple_call_arg_ptr (stmt, i); |
| 111 | 2046 maybe_rewrite_mem_ref_base (argp, suitable_for_renaming); |
|
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2047 } |
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2048 } |
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2049 |
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2050 else if (gimple_code (stmt) == GIMPLE_ASM) |
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2051 { |
| 111 | 2052 gasm *asm_stmt = as_a <gasm *> (stmt); |
|
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2053 unsigned i; |
| 111 | 2054 for (i = 0; i < gimple_asm_noutputs (asm_stmt); ++i) |
|
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2055 { |
| 111 | 2056 tree link = gimple_asm_output_op (asm_stmt, i); |
| 2057 maybe_rewrite_mem_ref_base (&TREE_VALUE (link), | |
| 2058 suitable_for_renaming); | |
|
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2059 } |
| 111 | 2060 for (i = 0; i < gimple_asm_ninputs (asm_stmt); ++i) |
|
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2061 { |
| 111 | 2062 tree link = gimple_asm_input_op (asm_stmt, i); |
| 2063 maybe_rewrite_mem_ref_base (&TREE_VALUE (link), | |
| 2064 suitable_for_renaming); | |
|
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2065 } |
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2066 } |
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2067 |
| 111 | 2068 else if (gimple_debug_bind_p (stmt) |
| 2069 && gimple_debug_bind_has_value_p (stmt)) | |
| 2070 { | |
| 2071 tree *valuep = gimple_debug_bind_get_value_ptr (stmt); | |
| 2072 tree decl; | |
| 2073 maybe_rewrite_mem_ref_base (valuep, suitable_for_renaming); | |
| 2074 decl = non_rewritable_mem_ref_base (*valuep); | |
| 2075 if (decl | |
| 2076 && bitmap_bit_p (suitable_for_renaming, DECL_UID (decl))) | |
| 2077 gimple_debug_bind_reset_value (stmt); | |
| 2078 } | |
| 2079 | |
|
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2080 if (gimple_references_memory_p (stmt) |
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2081 || is_gimple_debug (stmt)) |
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2082 update_stmt (stmt); |
| 111 | 2083 |
| 2084 gsi_next (&gsi); | |
|
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2085 } |
|
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2086 |
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2087 /* Update SSA form here, we are called as non-pass as well. */ |
| 111 | 2088 if (number_of_loops (cfun) > 1 |
| 2089 && loops_state_satisfies_p (LOOP_CLOSED_SSA)) | |
| 2090 rewrite_into_loop_closed_ssa (NULL, TODO_update_ssa); | |
| 2091 else | |
| 2092 update_ssa (TODO_update_ssa); | |
|
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2093 } |
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2094 |
|
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2095 timevar_pop (TV_ADDRESS_TAKEN); |
| 0 | 2096 } |
| 2097 | |
| 111 | 2098 namespace { |
| 2099 | |
| 2100 const pass_data pass_data_update_address_taken = | |
| 2101 { | |
| 2102 GIMPLE_PASS, /* type */ | |
| 2103 "addressables", /* name */ | |
| 2104 OPTGROUP_NONE, /* optinfo_flags */ | |
| 2105 TV_ADDRESS_TAKEN, /* tv_id */ | |
| 2106 PROP_ssa, /* properties_required */ | |
| 2107 0, /* properties_provided */ | |
| 2108 0, /* properties_destroyed */ | |
| 2109 0, /* todo_flags_start */ | |
| 2110 TODO_update_address_taken, /* todo_flags_finish */ | |
| 2111 }; | |
| 2112 | |
| 2113 class pass_update_address_taken : public gimple_opt_pass | |
| 0 | 2114 { |
| 111 | 2115 public: |
| 2116 pass_update_address_taken (gcc::context *ctxt) | |
| 2117 : gimple_opt_pass (pass_data_update_address_taken, ctxt) | |
| 2118 {} | |
| 2119 | |
| 2120 /* opt_pass methods: */ | |
| 2121 | |
| 2122 }; // class pass_update_address_taken | |
| 2123 | |
| 2124 } // anon namespace | |
| 2125 | |
| 2126 gimple_opt_pass * | |
| 2127 make_pass_update_address_taken (gcc::context *ctxt) | |
| 2128 { | |
| 2129 return new pass_update_address_taken (ctxt); | |
| 2130 } |