Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa.c @ 88:f214c1d5b862
merge 89
| author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 20 Dec 2011 18:53:46 +0900 |
| parents | f6334be47118 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* Miscellaneous SSA utility functions. |
|
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2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010 |
| 0 | 3 Free Software Foundation, Inc. |
| 4 | |
| 5 This file is part of GCC. | |
| 6 | |
| 7 GCC is free software; you can redistribute it and/or modify | |
| 8 it under the terms of the GNU General Public License as published by | |
| 9 the Free Software Foundation; either version 3, or (at your option) | |
| 10 any later version. | |
| 11 | |
| 12 GCC is distributed in the hope that it will be useful, | |
| 13 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 GNU General Public License for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with GCC; see the file COPYING3. If not see | |
| 19 <http://www.gnu.org/licenses/>. */ | |
| 20 | |
| 21 #include "config.h" | |
| 22 #include "system.h" | |
| 23 #include "coretypes.h" | |
| 24 #include "tm.h" | |
| 25 #include "tree.h" | |
| 26 #include "flags.h" | |
| 27 #include "tm_p.h" | |
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28 #include "target.h" |
| 0 | 29 #include "ggc.h" |
| 30 #include "langhooks.h" | |
| 31 #include "basic-block.h" | |
| 32 #include "output.h" | |
| 33 #include "function.h" | |
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34 #include "tree-pretty-print.h" |
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35 #include "gimple-pretty-print.h" |
| 0 | 36 #include "bitmap.h" |
| 37 #include "pointer-set.h" | |
| 38 #include "tree-flow.h" | |
| 39 #include "gimple.h" | |
| 40 #include "tree-inline.h" | |
| 41 #include "timevar.h" | |
| 42 #include "hashtab.h" | |
| 43 #include "tree-dump.h" | |
| 44 #include "tree-pass.h" | |
|
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45 #include "diagnostic-core.h" |
| 0 | 46 |
| 47 /* Pointer map of variable mappings, keyed by edge. */ | |
| 48 static struct pointer_map_t *edge_var_maps; | |
| 49 | |
| 50 | |
| 51 /* Add a mapping with PHI RESULT and PHI DEF associated with edge E. */ | |
| 52 | |
| 53 void | |
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54 redirect_edge_var_map_add (edge e, tree result, tree def, source_location locus) |
| 0 | 55 { |
| 56 void **slot; | |
| 57 edge_var_map_vector old_head, head; | |
| 58 edge_var_map new_node; | |
| 59 | |
| 60 if (edge_var_maps == NULL) | |
| 61 edge_var_maps = pointer_map_create (); | |
| 62 | |
| 63 slot = pointer_map_insert (edge_var_maps, e); | |
| 64 old_head = head = (edge_var_map_vector) *slot; | |
| 65 if (!head) | |
| 66 { | |
| 67 head = VEC_alloc (edge_var_map, heap, 5); | |
| 68 *slot = head; | |
| 69 } | |
| 70 new_node.def = def; | |
| 71 new_node.result = result; | |
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72 new_node.locus = locus; |
| 0 | 73 |
| 74 VEC_safe_push (edge_var_map, heap, head, &new_node); | |
| 75 if (old_head != head) | |
| 76 { | |
| 77 /* The push did some reallocation. Update the pointer map. */ | |
| 78 *slot = head; | |
| 79 } | |
| 80 } | |
| 81 | |
| 82 | |
| 83 /* Clear the var mappings in edge E. */ | |
| 84 | |
| 85 void | |
| 86 redirect_edge_var_map_clear (edge e) | |
| 87 { | |
| 88 void **slot; | |
| 89 edge_var_map_vector head; | |
| 90 | |
| 91 if (!edge_var_maps) | |
| 92 return; | |
| 93 | |
| 94 slot = pointer_map_contains (edge_var_maps, e); | |
| 95 | |
| 96 if (slot) | |
| 97 { | |
| 98 head = (edge_var_map_vector) *slot; | |
| 99 VEC_free (edge_var_map, heap, head); | |
| 100 *slot = NULL; | |
| 101 } | |
| 102 } | |
| 103 | |
| 104 | |
| 105 /* Duplicate the redirected var mappings in OLDE in NEWE. | |
| 106 | |
| 107 Since we can't remove a mapping, let's just duplicate it. This assumes a | |
| 108 pointer_map can have multiple edges mapping to the same var_map (many to | |
| 109 one mapping), since we don't remove the previous mappings. */ | |
| 110 | |
| 111 void | |
| 112 redirect_edge_var_map_dup (edge newe, edge olde) | |
| 113 { | |
| 114 void **new_slot, **old_slot; | |
| 115 edge_var_map_vector head; | |
| 116 | |
| 117 if (!edge_var_maps) | |
| 118 return; | |
| 119 | |
| 120 new_slot = pointer_map_insert (edge_var_maps, newe); | |
| 121 old_slot = pointer_map_contains (edge_var_maps, olde); | |
| 122 if (!old_slot) | |
| 123 return; | |
| 124 head = (edge_var_map_vector) *old_slot; | |
| 125 | |
| 126 if (head) | |
| 127 *new_slot = VEC_copy (edge_var_map, heap, head); | |
| 128 else | |
| 129 *new_slot = VEC_alloc (edge_var_map, heap, 5); | |
| 130 } | |
| 131 | |
| 132 | |
| 133 /* Return the variable mappings for a given edge. If there is none, return | |
| 134 NULL. */ | |
| 135 | |
| 136 edge_var_map_vector | |
| 137 redirect_edge_var_map_vector (edge e) | |
| 138 { | |
| 139 void **slot; | |
| 140 | |
| 141 /* Hey, what kind of idiot would... you'd be surprised. */ | |
| 142 if (!edge_var_maps) | |
| 143 return NULL; | |
| 144 | |
| 145 slot = pointer_map_contains (edge_var_maps, e); | |
| 146 if (!slot) | |
| 147 return NULL; | |
| 148 | |
| 149 return (edge_var_map_vector) *slot; | |
| 150 } | |
| 151 | |
| 152 /* Used by redirect_edge_var_map_destroy to free all memory. */ | |
| 153 | |
| 154 static bool | |
| 155 free_var_map_entry (const void *key ATTRIBUTE_UNUSED, | |
| 156 void **value, | |
| 157 void *data ATTRIBUTE_UNUSED) | |
| 158 { | |
| 159 edge_var_map_vector head = (edge_var_map_vector) *value; | |
| 160 VEC_free (edge_var_map, heap, head); | |
| 161 return true; | |
| 162 } | |
| 163 | |
| 164 /* Clear the edge variable mappings. */ | |
| 165 | |
| 166 void | |
| 167 redirect_edge_var_map_destroy (void) | |
| 168 { | |
| 169 if (edge_var_maps) | |
| 170 { | |
| 171 pointer_map_traverse (edge_var_maps, free_var_map_entry, NULL); | |
| 172 pointer_map_destroy (edge_var_maps); | |
| 173 edge_var_maps = NULL; | |
| 174 } | |
| 175 } | |
| 176 | |
| 177 | |
| 178 /* Remove the corresponding arguments from the PHI nodes in E's | |
| 179 destination block and redirect it to DEST. Return redirected edge. | |
| 180 The list of removed arguments is stored in a vector accessed | |
| 181 through edge_var_maps. */ | |
| 182 | |
| 183 edge | |
| 184 ssa_redirect_edge (edge e, basic_block dest) | |
| 185 { | |
| 186 gimple_stmt_iterator gsi; | |
| 187 gimple phi; | |
| 188 | |
| 189 redirect_edge_var_map_clear (e); | |
| 190 | |
| 191 /* Remove the appropriate PHI arguments in E's destination block. */ | |
| 192 for (gsi = gsi_start_phis (e->dest); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 193 { | |
| 194 tree def; | |
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195 source_location locus ; |
| 0 | 196 |
| 197 phi = gsi_stmt (gsi); | |
| 198 def = gimple_phi_arg_def (phi, e->dest_idx); | |
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199 locus = gimple_phi_arg_location (phi, e->dest_idx); |
| 0 | 200 |
| 201 if (def == NULL_TREE) | |
| 202 continue; | |
| 203 | |
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204 redirect_edge_var_map_add (e, gimple_phi_result (phi), def, locus); |
| 0 | 205 } |
| 206 | |
| 207 e = redirect_edge_succ_nodup (e, dest); | |
| 208 | |
| 209 return e; | |
| 210 } | |
| 211 | |
| 212 | |
| 213 /* Add PHI arguments queued in PENDING_STMT list on edge E to edge | |
| 214 E->dest. */ | |
| 215 | |
| 216 void | |
| 217 flush_pending_stmts (edge e) | |
| 218 { | |
| 219 gimple phi; | |
| 220 edge_var_map_vector v; | |
| 221 edge_var_map *vm; | |
| 222 int i; | |
| 223 gimple_stmt_iterator gsi; | |
| 224 | |
| 225 v = redirect_edge_var_map_vector (e); | |
| 226 if (!v) | |
| 227 return; | |
| 228 | |
| 229 for (gsi = gsi_start_phis (e->dest), i = 0; | |
| 230 !gsi_end_p (gsi) && VEC_iterate (edge_var_map, v, i, vm); | |
| 231 gsi_next (&gsi), i++) | |
| 232 { | |
| 233 tree def; | |
| 234 | |
| 235 phi = gsi_stmt (gsi); | |
| 236 def = redirect_edge_var_map_def (vm); | |
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237 add_phi_arg (phi, def, e, redirect_edge_var_map_location (vm)); |
| 0 | 238 } |
| 239 | |
| 240 redirect_edge_var_map_clear (e); | |
| 241 } | |
| 242 | |
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243 /* Given a tree for an expression for which we might want to emit |
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244 locations or values in debug information (generally a variable, but |
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245 we might deal with other kinds of trees in the future), return the |
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246 tree that should be used as the variable of a DEBUG_BIND STMT or |
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247 VAR_LOCATION INSN or NOTE. Return NULL if VAR is not to be tracked. */ |
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248 |
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249 tree |
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250 target_for_debug_bind (tree var) |
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251 { |
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252 if (!MAY_HAVE_DEBUG_STMTS) |
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253 return NULL_TREE; |
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254 |
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255 if (TREE_CODE (var) != VAR_DECL |
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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 |
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265 if (!is_gimple_reg (var)) |
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266 return NULL_TREE; |
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267 |
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268 return var; |
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269 } |
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270 |
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271 /* Called via walk_tree, look for SSA_NAMEs that have already been |
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272 released. */ |
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273 |
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274 static tree |
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275 find_released_ssa_name (tree *tp, int *walk_subtrees, void *data_) |
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276 { |
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277 struct walk_stmt_info *wi = (struct walk_stmt_info *) data_; |
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278 |
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279 if (wi && wi->is_lhs) |
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280 return NULL_TREE; |
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281 |
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282 if (TREE_CODE (*tp) == SSA_NAME) |
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283 { |
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284 if (SSA_NAME_IN_FREE_LIST (*tp)) |
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285 return *tp; |
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286 |
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287 *walk_subtrees = 0; |
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288 } |
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289 else if (IS_TYPE_OR_DECL_P (*tp)) |
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290 *walk_subtrees = 0; |
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291 |
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292 return NULL_TREE; |
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293 } |
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294 |
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295 /* Insert a DEBUG BIND stmt before the DEF of VAR if VAR is referenced |
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296 by other DEBUG stmts, and replace uses of the DEF with the |
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297 newly-created debug temp. */ |
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298 |
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299 void |
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300 insert_debug_temp_for_var_def (gimple_stmt_iterator *gsi, tree var) |
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301 { |
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302 imm_use_iterator imm_iter; |
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303 use_operand_p use_p; |
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304 gimple stmt; |
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305 gimple def_stmt = NULL; |
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306 int usecount = 0; |
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307 tree value = NULL; |
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308 |
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309 if (!MAY_HAVE_DEBUG_STMTS) |
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310 return; |
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311 |
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312 /* If this name has already been registered for replacement, do nothing |
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313 as anything that uses this name isn't in SSA form. */ |
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314 if (name_registered_for_update_p (var)) |
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315 return; |
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316 |
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317 /* Check whether there are debug stmts that reference this variable and, |
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318 if there are, decide whether we should use a debug temp. */ |
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319 FOR_EACH_IMM_USE_FAST (use_p, imm_iter, var) |
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320 { |
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321 stmt = USE_STMT (use_p); |
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322 |
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323 if (!gimple_debug_bind_p (stmt)) |
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324 continue; |
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325 |
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326 if (usecount++) |
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327 break; |
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328 |
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329 if (gimple_debug_bind_get_value (stmt) != var) |
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330 { |
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331 /* Count this as an additional use, so as to make sure we |
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332 use a temp unless VAR's definition has a SINGLE_RHS that |
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333 can be shared. */ |
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334 usecount++; |
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335 break; |
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336 } |
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337 } |
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338 |
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339 if (!usecount) |
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340 return; |
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341 |
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342 if (gsi) |
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343 def_stmt = gsi_stmt (*gsi); |
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344 else |
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345 def_stmt = SSA_NAME_DEF_STMT (var); |
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346 |
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347 /* If we didn't get an insertion point, and the stmt has already |
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348 been removed, we won't be able to insert the debug bind stmt, so |
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349 we'll have to drop debug information. */ |
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350 if (gimple_code (def_stmt) == GIMPLE_PHI) |
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351 { |
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352 value = degenerate_phi_result (def_stmt); |
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353 if (value && walk_tree (&value, find_released_ssa_name, NULL, NULL)) |
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354 value = NULL; |
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355 } |
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356 else if (is_gimple_assign (def_stmt)) |
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357 { |
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358 bool no_value = false; |
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359 |
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360 if (!dom_info_available_p (CDI_DOMINATORS)) |
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361 { |
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362 struct walk_stmt_info wi; |
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363 |
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364 memset (&wi, 0, sizeof (wi)); |
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365 |
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366 /* When removing blocks without following reverse dominance |
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367 order, we may sometimes encounter SSA_NAMEs that have |
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368 already been released, referenced in other SSA_DEFs that |
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369 we're about to release. Consider: |
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370 |
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371 <bb X>: |
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372 v_1 = foo; |
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373 |
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374 <bb Y>: |
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375 w_2 = v_1 + bar; |
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376 # DEBUG w => w_2 |
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377 |
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378 If we deleted BB X first, propagating the value of w_2 |
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379 won't do us any good. It's too late to recover their |
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380 original definition of v_1: when it was deleted, it was |
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381 only referenced in other DEFs, it couldn't possibly know |
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382 it should have been retained, and propagating every |
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383 single DEF just in case it might have to be propagated |
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384 into a DEBUG STMT would probably be too wasteful. |
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385 |
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386 When dominator information is not readily available, we |
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387 check for and accept some loss of debug information. But |
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388 if it is available, there's no excuse for us to remove |
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389 blocks in the wrong order, so we don't even check for |
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390 dead SSA NAMEs. SSA verification shall catch any |
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391 errors. */ |
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392 if ((!gsi && !gimple_bb (def_stmt)) |
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393 || walk_gimple_op (def_stmt, find_released_ssa_name, &wi)) |
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394 no_value = true; |
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395 } |
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396 |
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397 if (!no_value) |
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398 value = gimple_assign_rhs_to_tree (def_stmt); |
|
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|
399 } |
|
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diff
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|
400 |
|
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diff
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|
401 if (value) |
|
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diff
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|
402 { |
|
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36
diff
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|
403 /* If there's a single use of VAR, and VAR is the entire debug |
|
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diff
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|
404 expression (usecount would have been incremented again |
|
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diff
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|
405 otherwise), and the definition involves only constants and |
|
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36
diff
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|
406 SSA names, then we can propagate VALUE into this single use, |
|
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diff
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|
407 avoiding the temp. |
|
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|
408 |
|
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|
409 We can also avoid using a temp if VALUE can be shared and |
|
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410 propagated into all uses, without generating expressions that |
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|
411 wouldn't be valid gimple RHSs. |
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|
412 |
|
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|
413 Other cases that would require unsharing or non-gimple RHSs |
|
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diff
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414 are deferred to a debug temp, although we could avoid temps |
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415 at the expense of duplication of expressions. */ |
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|
416 |
|
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417 if (CONSTANT_CLASS_P (value) |
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418 || gimple_code (def_stmt) == GIMPLE_PHI |
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419 || (usecount == 1 |
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420 && (!gimple_assign_single_p (def_stmt) |
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|
421 || is_gimple_min_invariant (value))) |
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422 || is_gimple_reg (value)) |
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423 value = unshare_expr (value); |
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424 else |
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425 { |
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|
426 gimple def_temp; |
|
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427 tree vexpr = make_node (DEBUG_EXPR_DECL); |
|
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428 |
|
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|
429 def_temp = gimple_build_debug_bind (vexpr, |
|
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diff
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|
430 unshare_expr (value), |
|
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|
431 def_stmt); |
|
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432 |
|
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433 DECL_ARTIFICIAL (vexpr) = 1; |
|
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434 TREE_TYPE (vexpr) = TREE_TYPE (value); |
|
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435 if (DECL_P (value)) |
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|
436 DECL_MODE (vexpr) = DECL_MODE (value); |
|
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437 else |
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438 DECL_MODE (vexpr) = TYPE_MODE (TREE_TYPE (value)); |
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439 |
|
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|
440 if (gsi) |
|
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|
441 gsi_insert_before (gsi, def_temp, GSI_SAME_STMT); |
|
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442 else |
|
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443 { |
|
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444 gimple_stmt_iterator ngsi = gsi_for_stmt (def_stmt); |
|
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|
445 gsi_insert_before (&ngsi, def_temp, GSI_SAME_STMT); |
|
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446 } |
|
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|
447 |
|
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448 value = vexpr; |
|
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449 } |
|
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parents:
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diff
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|
450 } |
|
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diff
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|
451 |
|
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parents:
36
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|
452 FOR_EACH_IMM_USE_STMT (stmt, imm_iter, var) |
|
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diff
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|
453 { |
|
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diff
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|
454 if (!gimple_debug_bind_p (stmt)) |
|
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|
455 continue; |
|
77e2b8dfacca
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parents:
36
diff
changeset
|
456 |
|
77e2b8dfacca
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parents:
36
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|
457 if (value) |
|
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parents:
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|
458 FOR_EACH_IMM_USE_ON_STMT (use_p, imm_iter) |
|
77e2b8dfacca
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parents:
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diff
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|
459 /* unshare_expr is not needed here. vexpr is either a |
|
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parents:
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diff
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|
460 SINGLE_RHS, that can be safely shared, some other RHS |
|
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diff
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461 that was unshared when we found it had a single debug |
|
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parents:
36
diff
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|
462 use, or a DEBUG_EXPR_DECL, that can be safely |
|
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parents:
36
diff
changeset
|
463 shared. */ |
|
77e2b8dfacca
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parents:
36
diff
changeset
|
464 SET_USE (use_p, value); |
|
77e2b8dfacca
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parents:
36
diff
changeset
|
465 else |
|
77e2b8dfacca
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parents:
36
diff
changeset
|
466 gimple_debug_bind_reset_value (stmt); |
|
77e2b8dfacca
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parents:
36
diff
changeset
|
467 |
|
77e2b8dfacca
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parents:
36
diff
changeset
|
468 update_stmt (stmt); |
|
77e2b8dfacca
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parents:
36
diff
changeset
|
469 } |
|
77e2b8dfacca
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parents:
36
diff
changeset
|
470 } |
|
77e2b8dfacca
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parents:
36
diff
changeset
|
471 |
|
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parents:
36
diff
changeset
|
472 |
|
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parents:
36
diff
changeset
|
473 /* Insert a DEBUG BIND stmt before STMT for each DEF referenced by |
|
77e2b8dfacca
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parents:
36
diff
changeset
|
474 other DEBUG stmts, and replace uses of the DEF with the |
|
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parents:
36
diff
changeset
|
475 newly-created debug temp. */ |
|
77e2b8dfacca
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parents:
36
diff
changeset
|
476 |
|
77e2b8dfacca
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parents:
36
diff
changeset
|
477 void |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
478 insert_debug_temps_for_defs (gimple_stmt_iterator *gsi) |
|
77e2b8dfacca
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parents:
36
diff
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|
479 { |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
480 gimple stmt; |
|
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parents:
36
diff
changeset
|
481 ssa_op_iter op_iter; |
|
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parents:
36
diff
changeset
|
482 def_operand_p def_p; |
|
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parents:
36
diff
changeset
|
483 |
|
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parents:
36
diff
changeset
|
484 if (!MAY_HAVE_DEBUG_STMTS) |
|
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parents:
36
diff
changeset
|
485 return; |
|
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parents:
36
diff
changeset
|
486 |
|
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parents:
36
diff
changeset
|
487 stmt = gsi_stmt (*gsi); |
|
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parents:
36
diff
changeset
|
488 |
|
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parents:
36
diff
changeset
|
489 FOR_EACH_PHI_OR_STMT_DEF (def_p, stmt, op_iter, SSA_OP_DEF) |
|
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parents:
36
diff
changeset
|
490 { |
|
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parents:
36
diff
changeset
|
491 tree var = DEF_FROM_PTR (def_p); |
|
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parents:
36
diff
changeset
|
492 |
|
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parents:
36
diff
changeset
|
493 if (TREE_CODE (var) != SSA_NAME) |
|
77e2b8dfacca
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parents:
36
diff
changeset
|
494 continue; |
|
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parents:
36
diff
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|
495 |
|
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parents:
36
diff
changeset
|
496 insert_debug_temp_for_var_def (gsi, var); |
|
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parents:
36
diff
changeset
|
497 } |
|
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parents:
36
diff
changeset
|
498 } |
|
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36
diff
changeset
|
499 |
|
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parents:
36
diff
changeset
|
500 /* Delete SSA DEFs for SSA versions in the TOREMOVE bitmap, removing |
|
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parents:
36
diff
changeset
|
501 dominated stmts before their dominators, so that release_ssa_defs |
|
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diff
changeset
|
502 stands a chance of propagating DEFs into debug bind stmts. */ |
|
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diff
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|
503 |
|
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diff
changeset
|
504 void |
|
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diff
changeset
|
505 release_defs_bitset (bitmap toremove) |
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diff
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|
506 { |
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diff
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|
507 unsigned j; |
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diff
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|
508 bitmap_iterator bi; |
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|
509 |
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510 /* Performing a topological sort is probably overkill, this will |
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diff
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|
511 most likely run in slightly superlinear time, rather than the |
|
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diff
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|
512 pathological quadratic worst case. */ |
|
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513 while (!bitmap_empty_p (toremove)) |
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514 EXECUTE_IF_SET_IN_BITMAP (toremove, 0, j, bi) |
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|
515 { |
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diff
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516 bool remove_now = true; |
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517 tree var = ssa_name (j); |
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|
518 gimple stmt; |
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|
519 imm_use_iterator uit; |
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520 |
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521 FOR_EACH_IMM_USE_STMT (stmt, uit, var) |
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522 { |
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523 ssa_op_iter dit; |
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|
524 def_operand_p def_p; |
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525 |
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526 /* We can't propagate PHI nodes into debug stmts. */ |
|
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527 if (gimple_code (stmt) == GIMPLE_PHI |
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528 || is_gimple_debug (stmt)) |
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529 continue; |
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diff
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|
530 |
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|
531 /* If we find another definition to remove that uses |
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532 the one we're looking at, defer the removal of this |
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533 one, so that it can be propagated into debug stmts |
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534 after the other is. */ |
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535 FOR_EACH_SSA_DEF_OPERAND (def_p, stmt, dit, SSA_OP_DEF) |
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|
536 { |
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537 tree odef = DEF_FROM_PTR (def_p); |
|
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|
538 |
|
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539 if (bitmap_bit_p (toremove, SSA_NAME_VERSION (odef))) |
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|
540 { |
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541 remove_now = false; |
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|
542 break; |
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543 } |
|
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544 } |
|
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545 |
|
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|
546 if (!remove_now) |
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547 BREAK_FROM_IMM_USE_STMT (uit); |
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548 } |
|
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diff
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|
549 |
|
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|
550 if (remove_now) |
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|
551 { |
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552 gimple def = SSA_NAME_DEF_STMT (var); |
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|
553 gimple_stmt_iterator gsi = gsi_for_stmt (def); |
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|
554 |
|
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|
555 if (gimple_code (def) == GIMPLE_PHI) |
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|
556 remove_phi_node (&gsi, true); |
|
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|
557 else |
|
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|
558 { |
|
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|
559 gsi_remove (&gsi, true); |
|
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|
560 release_defs (def); |
|
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|
561 } |
|
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diff
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|
562 |
|
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|
563 bitmap_clear_bit (toremove, j); |
|
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|
564 } |
|
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changeset
|
565 } |
|
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|
566 } |
|
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|
567 |
| 0 | 568 /* Return true if SSA_NAME is malformed and mark it visited. |
| 569 | |
| 570 IS_VIRTUAL is true if this SSA_NAME was found inside a virtual | |
| 571 operand. */ | |
| 572 | |
| 573 static bool | |
| 574 verify_ssa_name (tree ssa_name, bool is_virtual) | |
| 575 { | |
| 576 if (TREE_CODE (ssa_name) != SSA_NAME) | |
| 577 { | |
| 578 error ("expected an SSA_NAME object"); | |
| 579 return true; | |
| 580 } | |
| 581 | |
| 582 if (TREE_TYPE (ssa_name) != TREE_TYPE (SSA_NAME_VAR (ssa_name))) | |
| 583 { | |
| 584 error ("type mismatch between an SSA_NAME and its symbol"); | |
| 585 return true; | |
| 586 } | |
| 587 | |
| 588 if (SSA_NAME_IN_FREE_LIST (ssa_name)) | |
| 589 { | |
| 590 error ("found an SSA_NAME that had been released into the free pool"); | |
| 591 return true; | |
| 592 } | |
| 593 | |
| 594 if (is_virtual && is_gimple_reg (ssa_name)) | |
| 595 { | |
| 596 error ("found a virtual definition for a GIMPLE register"); | |
| 597 return true; | |
| 598 } | |
| 599 | |
|
55
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|
600 if (is_virtual && SSA_NAME_VAR (ssa_name) != gimple_vop (cfun)) |
|
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changeset
|
601 { |
|
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diff
changeset
|
602 error ("virtual SSA name for non-VOP decl"); |
|
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diff
changeset
|
603 return true; |
|
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diff
changeset
|
604 } |
|
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|
605 |
| 0 | 606 if (!is_virtual && !is_gimple_reg (ssa_name)) |
| 607 { | |
| 608 error ("found a real definition for a non-register"); | |
| 609 return true; | |
| 610 } | |
| 611 | |
| 612 if (SSA_NAME_IS_DEFAULT_DEF (ssa_name) | |
| 613 && !gimple_nop_p (SSA_NAME_DEF_STMT (ssa_name))) | |
| 614 { | |
| 615 error ("found a default name with a non-empty defining statement"); | |
| 616 return true; | |
| 617 } | |
| 618 | |
| 619 return false; | |
| 620 } | |
| 621 | |
| 622 | |
| 623 /* Return true if the definition of SSA_NAME at block BB is malformed. | |
| 624 | |
| 625 STMT is the statement where SSA_NAME is created. | |
| 626 | |
| 627 DEFINITION_BLOCK is an array of basic blocks indexed by SSA_NAME | |
| 628 version numbers. If DEFINITION_BLOCK[SSA_NAME_VERSION] is set, | |
| 629 it means that the block in that array slot contains the | |
| 630 definition of SSA_NAME. | |
| 631 | |
| 632 IS_VIRTUAL is true if SSA_NAME is created by a VDEF. */ | |
| 633 | |
| 634 static bool | |
| 635 verify_def (basic_block bb, basic_block *definition_block, tree ssa_name, | |
| 636 gimple stmt, bool is_virtual) | |
| 637 { | |
| 638 if (verify_ssa_name (ssa_name, is_virtual)) | |
| 639 goto err; | |
| 640 | |
|
67
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diff
changeset
|
641 if (TREE_CODE (SSA_NAME_VAR (ssa_name)) == RESULT_DECL |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
642 && DECL_BY_REFERENCE (SSA_NAME_VAR (ssa_name))) |
|
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changeset
|
643 { |
|
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diff
changeset
|
644 error ("RESULT_DECL should be read only when DECL_BY_REFERENCE is set"); |
|
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changeset
|
645 goto err; |
|
f6334be47118
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parents:
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changeset
|
646 } |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
647 |
| 0 | 648 if (definition_block[SSA_NAME_VERSION (ssa_name)]) |
| 649 { | |
| 650 error ("SSA_NAME created in two different blocks %i and %i", | |
| 651 definition_block[SSA_NAME_VERSION (ssa_name)]->index, bb->index); | |
| 652 goto err; | |
| 653 } | |
| 654 | |
| 655 definition_block[SSA_NAME_VERSION (ssa_name)] = bb; | |
| 656 | |
| 657 if (SSA_NAME_DEF_STMT (ssa_name) != stmt) | |
| 658 { | |
| 659 error ("SSA_NAME_DEF_STMT is wrong"); | |
| 660 fprintf (stderr, "Expected definition statement:\n"); | |
| 661 print_gimple_stmt (stderr, SSA_NAME_DEF_STMT (ssa_name), 4, TDF_VOPS); | |
| 662 fprintf (stderr, "\nActual definition statement:\n"); | |
| 663 print_gimple_stmt (stderr, stmt, 4, TDF_VOPS); | |
| 664 goto err; | |
| 665 } | |
| 666 | |
| 667 return false; | |
| 668 | |
| 669 err: | |
| 670 fprintf (stderr, "while verifying SSA_NAME "); | |
| 671 print_generic_expr (stderr, ssa_name, 0); | |
| 672 fprintf (stderr, " in statement\n"); | |
| 673 print_gimple_stmt (stderr, stmt, 4, TDF_VOPS); | |
| 674 | |
| 675 return true; | |
| 676 } | |
| 677 | |
| 678 | |
| 679 /* Return true if the use of SSA_NAME at statement STMT in block BB is | |
| 680 malformed. | |
| 681 | |
| 682 DEF_BB is the block where SSA_NAME was found to be created. | |
| 683 | |
| 684 IDOM contains immediate dominator information for the flowgraph. | |
| 685 | |
| 686 CHECK_ABNORMAL is true if the caller wants to check whether this use | |
| 687 is flowing through an abnormal edge (only used when checking PHI | |
| 688 arguments). | |
| 689 | |
| 690 If NAMES_DEFINED_IN_BB is not NULL, it contains a bitmap of ssa names | |
| 691 that are defined before STMT in basic block BB. */ | |
| 692 | |
| 693 static bool | |
| 694 verify_use (basic_block bb, basic_block def_bb, use_operand_p use_p, | |
| 695 gimple stmt, bool check_abnormal, bitmap names_defined_in_bb) | |
| 696 { | |
| 697 bool err = false; | |
| 698 tree ssa_name = USE_FROM_PTR (use_p); | |
| 699 | |
| 700 if (!TREE_VISITED (ssa_name)) | |
| 701 if (verify_imm_links (stderr, ssa_name)) | |
| 702 err = true; | |
| 703 | |
| 704 TREE_VISITED (ssa_name) = 1; | |
| 705 | |
| 706 if (gimple_nop_p (SSA_NAME_DEF_STMT (ssa_name)) | |
| 707 && SSA_NAME_IS_DEFAULT_DEF (ssa_name)) | |
| 708 ; /* Default definitions have empty statements. Nothing to do. */ | |
| 709 else if (!def_bb) | |
| 710 { | |
| 711 error ("missing definition"); | |
| 712 err = true; | |
| 713 } | |
| 714 else if (bb != def_bb | |
| 715 && !dominated_by_p (CDI_DOMINATORS, bb, def_bb)) | |
| 716 { | |
| 717 error ("definition in block %i does not dominate use in block %i", | |
| 718 def_bb->index, bb->index); | |
| 719 err = true; | |
| 720 } | |
| 721 else if (bb == def_bb | |
| 722 && names_defined_in_bb != NULL | |
| 723 && !bitmap_bit_p (names_defined_in_bb, SSA_NAME_VERSION (ssa_name))) | |
| 724 { | |
| 725 error ("definition in block %i follows the use", def_bb->index); | |
| 726 err = true; | |
| 727 } | |
| 728 | |
| 729 if (check_abnormal | |
| 730 && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ssa_name)) | |
| 731 { | |
| 732 error ("SSA_NAME_OCCURS_IN_ABNORMAL_PHI should be set"); | |
| 733 err = true; | |
| 734 } | |
| 735 | |
|
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diff
changeset
|
736 /* Make sure the use is in an appropriate list by checking the previous |
| 0 | 737 element to make sure it's the same. */ |
| 738 if (use_p->prev == NULL) | |
| 739 { | |
| 740 error ("no immediate_use list"); | |
| 741 err = true; | |
| 742 } | |
| 743 else | |
| 744 { | |
| 745 tree listvar; | |
| 746 if (use_p->prev->use == NULL) | |
| 747 listvar = use_p->prev->loc.ssa_name; | |
| 748 else | |
| 749 listvar = USE_FROM_PTR (use_p->prev); | |
| 750 if (listvar != ssa_name) | |
| 751 { | |
| 752 error ("wrong immediate use list"); | |
| 753 err = true; | |
| 754 } | |
| 755 } | |
| 756 | |
| 757 if (err) | |
| 758 { | |
| 759 fprintf (stderr, "for SSA_NAME: "); | |
| 760 print_generic_expr (stderr, ssa_name, TDF_VOPS); | |
| 761 fprintf (stderr, " in statement:\n"); | |
| 762 print_gimple_stmt (stderr, stmt, 0, TDF_VOPS); | |
| 763 } | |
| 764 | |
| 765 return err; | |
| 766 } | |
| 767 | |
| 768 | |
| 769 /* Return true if any of the arguments for PHI node PHI at block BB is | |
| 770 malformed. | |
| 771 | |
| 772 DEFINITION_BLOCK is an array of basic blocks indexed by SSA_NAME | |
| 773 version numbers. If DEFINITION_BLOCK[SSA_NAME_VERSION] is set, | |
| 774 it means that the block in that array slot contains the | |
| 775 definition of SSA_NAME. */ | |
| 776 | |
| 777 static bool | |
| 778 verify_phi_args (gimple phi, basic_block bb, basic_block *definition_block) | |
| 779 { | |
| 780 edge e; | |
| 781 bool err = false; | |
| 782 size_t i, phi_num_args = gimple_phi_num_args (phi); | |
| 783 | |
| 784 if (EDGE_COUNT (bb->preds) != phi_num_args) | |
| 785 { | |
| 786 error ("incoming edge count does not match number of PHI arguments"); | |
| 787 err = true; | |
| 788 goto error; | |
| 789 } | |
| 790 | |
| 791 for (i = 0; i < phi_num_args; i++) | |
| 792 { | |
| 793 use_operand_p op_p = gimple_phi_arg_imm_use_ptr (phi, i); | |
| 794 tree op = USE_FROM_PTR (op_p); | |
| 795 | |
| 796 e = EDGE_PRED (bb, i); | |
| 797 | |
| 798 if (op == NULL_TREE) | |
| 799 { | |
| 800 error ("PHI argument is missing for edge %d->%d", | |
| 801 e->src->index, | |
| 802 e->dest->index); | |
| 803 err = true; | |
| 804 goto error; | |
| 805 } | |
| 806 | |
| 807 if (TREE_CODE (op) != SSA_NAME && !is_gimple_min_invariant (op)) | |
| 808 { | |
| 809 error ("PHI argument is not SSA_NAME, or invariant"); | |
| 810 err = true; | |
| 811 } | |
| 812 | |
| 813 if (TREE_CODE (op) == SSA_NAME) | |
| 814 { | |
| 815 err = verify_ssa_name (op, !is_gimple_reg (gimple_phi_result (phi))); | |
| 816 err |= verify_use (e->src, definition_block[SSA_NAME_VERSION (op)], | |
| 817 op_p, phi, e->flags & EDGE_ABNORMAL, NULL); | |
| 818 } | |
| 819 | |
|
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diff
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|
820 if (TREE_CODE (op) == ADDR_EXPR) |
|
77e2b8dfacca
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36
diff
changeset
|
821 { |
|
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diff
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|
822 tree base = TREE_OPERAND (op, 0); |
|
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diff
changeset
|
823 while (handled_component_p (base)) |
|
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diff
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|
824 base = TREE_OPERAND (base, 0); |
|
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diff
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|
825 if ((TREE_CODE (base) == VAR_DECL |
|
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diff
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|
826 || TREE_CODE (base) == PARM_DECL |
|
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|
827 || TREE_CODE (base) == RESULT_DECL) |
|
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diff
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|
828 && !TREE_ADDRESSABLE (base)) |
|
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diff
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|
829 { |
|
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36
diff
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|
830 error ("address taken, but ADDRESSABLE bit not set"); |
|
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36
diff
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|
831 err = true; |
|
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36
diff
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|
832 } |
|
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diff
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|
833 } |
|
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diff
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|
834 |
| 0 | 835 if (e->dest != bb) |
| 836 { | |
| 837 error ("wrong edge %d->%d for PHI argument", | |
| 838 e->src->index, e->dest->index); | |
| 839 err = true; | |
| 840 } | |
| 841 | |
| 842 if (err) | |
| 843 { | |
| 844 fprintf (stderr, "PHI argument\n"); | |
| 845 print_generic_stmt (stderr, op, TDF_VOPS); | |
| 846 goto error; | |
| 847 } | |
| 848 } | |
| 849 | |
| 850 error: | |
| 851 if (err) | |
| 852 { | |
| 853 fprintf (stderr, "for PHI node\n"); | |
| 854 print_gimple_stmt (stderr, phi, 0, TDF_VOPS|TDF_MEMSYMS); | |
| 855 } | |
| 856 | |
| 857 | |
| 858 return err; | |
| 859 } | |
| 860 | |
| 861 | |
| 862 /* Verify common invariants in the SSA web. | |
| 863 TODO: verify the variable annotations. */ | |
| 864 | |
|
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diff
changeset
|
865 DEBUG_FUNCTION void |
| 0 | 866 verify_ssa (bool check_modified_stmt) |
| 867 { | |
| 868 size_t i; | |
| 869 basic_block bb; | |
| 870 basic_block *definition_block = XCNEWVEC (basic_block, num_ssa_names); | |
| 871 ssa_op_iter iter; | |
| 872 tree op; | |
| 873 enum dom_state orig_dom_state = dom_info_state (CDI_DOMINATORS); | |
| 874 bitmap names_defined_in_bb = BITMAP_ALLOC (NULL); | |
| 875 | |
|
55
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diff
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|
876 gcc_assert (!need_ssa_update_p (cfun)); |
| 0 | 877 |
| 878 verify_stmts (); | |
| 879 | |
| 880 timevar_push (TV_TREE_SSA_VERIFY); | |
| 881 | |
| 882 /* Keep track of SSA names present in the IL. */ | |
| 883 for (i = 1; i < num_ssa_names; i++) | |
| 884 { | |
| 885 tree name = ssa_name (i); | |
| 886 if (name) | |
| 887 { | |
| 888 gimple stmt; | |
| 889 TREE_VISITED (name) = 0; | |
| 890 | |
| 891 stmt = SSA_NAME_DEF_STMT (name); | |
| 892 if (!gimple_nop_p (stmt)) | |
| 893 { | |
| 894 basic_block bb = gimple_bb (stmt); | |
| 895 verify_def (bb, definition_block, | |
| 896 name, stmt, !is_gimple_reg (name)); | |
| 897 | |
| 898 } | |
| 899 } | |
| 900 } | |
| 901 | |
| 902 calculate_dominance_info (CDI_DOMINATORS); | |
| 903 | |
| 904 /* Now verify all the uses and make sure they agree with the definitions | |
| 905 found in the previous pass. */ | |
| 906 FOR_EACH_BB (bb) | |
| 907 { | |
| 908 edge e; | |
| 909 gimple phi; | |
| 910 edge_iterator ei; | |
| 911 gimple_stmt_iterator gsi; | |
| 912 | |
| 913 /* Make sure that all edges have a clear 'aux' field. */ | |
| 914 FOR_EACH_EDGE (e, ei, bb->preds) | |
| 915 { | |
| 916 if (e->aux) | |
| 917 { | |
| 918 error ("AUX pointer initialized for edge %d->%d", e->src->index, | |
| 919 e->dest->index); | |
| 920 goto err; | |
| 921 } | |
| 922 } | |
| 923 | |
| 924 /* Verify the arguments for every PHI node in the block. */ | |
| 925 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 926 { | |
| 927 phi = gsi_stmt (gsi); | |
| 928 if (verify_phi_args (phi, bb, definition_block)) | |
| 929 goto err; | |
| 930 | |
| 931 bitmap_set_bit (names_defined_in_bb, | |
| 932 SSA_NAME_VERSION (gimple_phi_result (phi))); | |
| 933 } | |
| 934 | |
| 935 /* Now verify all the uses and vuses in every statement of the block. */ | |
| 936 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 937 { | |
| 938 gimple stmt = gsi_stmt (gsi); | |
| 939 use_operand_p use_p; | |
|
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diff
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|
940 bool has_err; |
|
67
f6334be47118
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parents:
63
diff
changeset
|
941 int count; |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
942 unsigned i; |
| 0 | 943 |
| 944 if (check_modified_stmt && gimple_modified_p (stmt)) | |
| 945 { | |
| 946 error ("stmt (%p) marked modified after optimization pass: ", | |
| 947 (void *)stmt); | |
| 948 print_gimple_stmt (stderr, stmt, 0, TDF_VOPS); | |
| 949 goto err; | |
| 950 } | |
| 951 | |
| 952 if (is_gimple_assign (stmt) | |
| 953 && TREE_CODE (gimple_assign_lhs (stmt)) != SSA_NAME) | |
| 954 { | |
| 955 tree lhs, base_address; | |
| 956 | |
| 957 lhs = gimple_assign_lhs (stmt); | |
| 958 base_address = get_base_address (lhs); | |
| 959 | |
| 960 if (base_address | |
| 961 && SSA_VAR_P (base_address) | |
|
55
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diff
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|
962 && !gimple_vdef (stmt) |
|
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parents:
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diff
changeset
|
963 && optimize > 0) |
| 0 | 964 { |
| 965 error ("statement makes a memory store, but has no VDEFS"); | |
| 966 print_gimple_stmt (stderr, stmt, 0, TDF_VOPS); | |
| 967 goto err; | |
| 968 } | |
| 969 } | |
|
55
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diff
changeset
|
970 else if (gimple_debug_bind_p (stmt) |
|
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diff
changeset
|
971 && !gimple_debug_bind_has_value_p (stmt)) |
|
77e2b8dfacca
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diff
changeset
|
972 continue; |
| 0 | 973 |
|
55
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36
diff
changeset
|
974 /* Verify the single virtual operand and its constraints. */ |
|
77e2b8dfacca
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diff
changeset
|
975 has_err = false; |
|
77e2b8dfacca
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parents:
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diff
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|
976 if (gimple_vdef (stmt)) |
| 0 | 977 { |
|
55
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diff
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|
978 if (gimple_vdef_op (stmt) == NULL_DEF_OPERAND_P) |
|
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diff
changeset
|
979 { |
|
77e2b8dfacca
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36
diff
changeset
|
980 error ("statement has VDEF operand not in defs list"); |
|
77e2b8dfacca
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diff
changeset
|
981 has_err = true; |
|
77e2b8dfacca
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diff
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|
982 } |
|
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diff
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|
983 if (!gimple_vuse (stmt)) |
| 0 | 984 { |
|
55
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diff
changeset
|
985 error ("statement has VDEF but no VUSE operand"); |
|
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diff
changeset
|
986 has_err = true; |
|
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diff
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|
987 } |
|
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diff
changeset
|
988 else if (SSA_NAME_VAR (gimple_vdef (stmt)) |
|
77e2b8dfacca
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diff
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|
989 != SSA_NAME_VAR (gimple_vuse (stmt))) |
|
77e2b8dfacca
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diff
changeset
|
990 { |
|
77e2b8dfacca
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diff
changeset
|
991 error ("VDEF and VUSE do not use the same symbol"); |
|
77e2b8dfacca
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diff
changeset
|
992 has_err = true; |
| 0 | 993 } |
|
55
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36
diff
changeset
|
994 has_err |= verify_ssa_name (gimple_vdef (stmt), true); |
|
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diff
changeset
|
995 } |
|
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diff
changeset
|
996 if (gimple_vuse (stmt)) |
|
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diff
changeset
|
997 { |
|
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diff
changeset
|
998 if (gimple_vuse_op (stmt) == NULL_USE_OPERAND_P) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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diff
changeset
|
999 { |
|
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diff
changeset
|
1000 error ("statement has VUSE operand not in uses list"); |
|
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diff
changeset
|
1001 has_err = true; |
|
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diff
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|
1002 } |
|
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diff
changeset
|
1003 has_err |= verify_ssa_name (gimple_vuse (stmt), true); |
|
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update it from 4.4.3 to 4.5.0
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diff
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|
1004 } |
|
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diff
changeset
|
1005 if (has_err) |
|
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diff
changeset
|
1006 { |
|
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diff
changeset
|
1007 error ("in statement"); |
|
77e2b8dfacca
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diff
changeset
|
1008 print_gimple_stmt (stderr, stmt, 0, TDF_VOPS|TDF_MEMSYMS); |
|
77e2b8dfacca
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diff
changeset
|
1009 goto err; |
| 0 | 1010 } |
| 1011 | |
|
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1012 count = 0; |
| 0 | 1013 FOR_EACH_SSA_TREE_OPERAND (op, stmt, iter, SSA_OP_USE|SSA_OP_DEF) |
| 1014 { | |
| 1015 if (verify_ssa_name (op, false)) | |
| 1016 { | |
| 1017 error ("in statement"); | |
| 1018 print_gimple_stmt (stderr, stmt, 0, TDF_VOPS|TDF_MEMSYMS); | |
| 1019 goto err; | |
| 1020 } | |
|
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1021 count++; |
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1022 } |
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1023 |
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1024 for (i = 0; i < gimple_num_ops (stmt); i++) |
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1025 { |
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1026 op = gimple_op (stmt, i); |
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1027 if (op && TREE_CODE (op) == SSA_NAME && --count < 0) |
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1028 { |
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1029 error ("number of operands and imm-links don%'t agree" |
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1030 " in statement"); |
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1031 print_gimple_stmt (stderr, stmt, 0, TDF_VOPS|TDF_MEMSYMS); |
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1032 goto err; |
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1033 } |
| 0 | 1034 } |
| 1035 | |
| 1036 FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_USE|SSA_OP_VUSE) | |
| 1037 { | |
| 1038 op = USE_FROM_PTR (use_p); | |
| 1039 if (verify_use (bb, definition_block[SSA_NAME_VERSION (op)], | |
| 1040 use_p, stmt, false, names_defined_in_bb)) | |
| 1041 goto err; | |
| 1042 } | |
| 1043 | |
| 1044 FOR_EACH_SSA_TREE_OPERAND (op, stmt, iter, SSA_OP_ALL_DEFS) | |
|
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1045 { |
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1046 if (SSA_NAME_DEF_STMT (op) != stmt) |
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1047 { |
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1048 error ("SSA_NAME_DEF_STMT is wrong"); |
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1049 fprintf (stderr, "Expected definition statement:\n"); |
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1050 print_gimple_stmt (stderr, stmt, 4, TDF_VOPS); |
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1051 fprintf (stderr, "\nActual definition statement:\n"); |
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1052 print_gimple_stmt (stderr, SSA_NAME_DEF_STMT (op), |
|
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1053 4, TDF_VOPS); |
|
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1054 goto err; |
|
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1055 } |
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1056 bitmap_set_bit (names_defined_in_bb, SSA_NAME_VERSION (op)); |
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1057 } |
| 0 | 1058 } |
| 1059 | |
| 1060 bitmap_clear (names_defined_in_bb); | |
| 1061 } | |
| 1062 | |
| 1063 free (definition_block); | |
| 1064 | |
| 1065 /* Restore the dominance information to its prior known state, so | |
| 1066 that we do not perturb the compiler's subsequent behavior. */ | |
| 1067 if (orig_dom_state == DOM_NONE) | |
| 1068 free_dominance_info (CDI_DOMINATORS); | |
| 1069 else | |
| 1070 set_dom_info_availability (CDI_DOMINATORS, orig_dom_state); | |
|
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1071 |
| 0 | 1072 BITMAP_FREE (names_defined_in_bb); |
| 1073 timevar_pop (TV_TREE_SSA_VERIFY); | |
| 1074 return; | |
| 1075 | |
| 1076 err: | |
| 1077 internal_error ("verify_ssa failed"); | |
| 1078 } | |
| 1079 | |
| 1080 /* Return true if the uid in both int tree maps are equal. */ | |
| 1081 | |
| 1082 int | |
| 1083 int_tree_map_eq (const void *va, const void *vb) | |
| 1084 { | |
| 1085 const struct int_tree_map *a = (const struct int_tree_map *) va; | |
| 1086 const struct int_tree_map *b = (const struct int_tree_map *) vb; | |
| 1087 return (a->uid == b->uid); | |
| 1088 } | |
| 1089 | |
| 1090 /* Hash a UID in a int_tree_map. */ | |
| 1091 | |
| 1092 unsigned int | |
| 1093 int_tree_map_hash (const void *item) | |
| 1094 { | |
| 1095 return ((const struct int_tree_map *)item)->uid; | |
| 1096 } | |
| 1097 | |
| 1098 /* Return true if the DECL_UID in both trees are equal. */ | |
| 1099 | |
| 1100 int | |
| 1101 uid_decl_map_eq (const void *va, const void *vb) | |
| 1102 { | |
| 1103 const_tree a = (const_tree) va; | |
| 1104 const_tree b = (const_tree) vb; | |
| 1105 return (a->decl_minimal.uid == b->decl_minimal.uid); | |
| 1106 } | |
| 1107 | |
| 1108 /* Hash a tree in a uid_decl_map. */ | |
| 1109 | |
| 1110 unsigned int | |
| 1111 uid_decl_map_hash (const void *item) | |
| 1112 { | |
| 1113 return ((const_tree)item)->decl_minimal.uid; | |
| 1114 } | |
| 1115 | |
| 1116 /* Return true if the DECL_UID in both trees are equal. */ | |
| 1117 | |
| 1118 static int | |
| 1119 uid_ssaname_map_eq (const void *va, const void *vb) | |
| 1120 { | |
| 1121 const_tree a = (const_tree) va; | |
| 1122 const_tree b = (const_tree) vb; | |
| 1123 return (a->ssa_name.var->decl_minimal.uid == b->ssa_name.var->decl_minimal.uid); | |
| 1124 } | |
| 1125 | |
| 1126 /* Hash a tree in a uid_decl_map. */ | |
| 1127 | |
| 1128 static unsigned int | |
| 1129 uid_ssaname_map_hash (const void *item) | |
| 1130 { | |
| 1131 return ((const_tree)item)->ssa_name.var->decl_minimal.uid; | |
| 1132 } | |
| 1133 | |
| 1134 | |
| 1135 /* Initialize global DFA and SSA structures. */ | |
| 1136 | |
| 1137 void | |
| 1138 init_tree_ssa (struct function *fn) | |
| 1139 { | |
|
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1140 fn->gimple_df = ggc_alloc_cleared_gimple_df (); |
|
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1141 fn->gimple_df->referenced_vars = htab_create_ggc (20, uid_decl_map_hash, |
| 0 | 1142 uid_decl_map_eq, NULL); |
|
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1143 fn->gimple_df->default_defs = htab_create_ggc (20, uid_ssaname_map_hash, |
| 0 | 1144 uid_ssaname_map_eq, NULL); |
|
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1145 pt_solution_reset (&fn->gimple_df->escaped); |
| 0 | 1146 init_ssanames (fn, 0); |
| 1147 init_phinodes (); | |
| 1148 } | |
| 1149 | |
| 1150 | |
| 1151 /* Deallocate memory associated with SSA data structures for FNDECL. */ | |
| 1152 | |
| 1153 void | |
| 1154 delete_tree_ssa (void) | |
| 1155 { | |
| 1156 referenced_var_iterator rvi; | |
| 1157 tree var; | |
| 1158 | |
| 1159 /* Remove annotations from every referenced local variable. */ | |
|
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|
1160 FOR_EACH_REFERENCED_VAR (cfun, var, rvi) |
| 0 | 1161 { |
|
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1162 if (is_global_var (var)) |
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|
1163 continue; |
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1164 if (var_ann (var)) |
| 0 | 1165 { |
|
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|
1166 ggc_free (var_ann (var)); |
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1167 *DECL_VAR_ANN_PTR (var) = NULL; |
| 0 | 1168 } |
| 1169 } | |
| 1170 htab_delete (gimple_referenced_vars (cfun)); | |
| 1171 cfun->gimple_df->referenced_vars = NULL; | |
| 1172 | |
| 1173 fini_ssanames (); | |
| 1174 fini_phinodes (); | |
| 1175 | |
| 1176 /* We no longer maintain the SSA operand cache at this point. */ | |
| 1177 if (ssa_operands_active ()) | |
| 1178 fini_ssa_operands (); | |
| 1179 | |
|
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|
1180 delete_alias_heapvars (); |
|
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1181 |
| 0 | 1182 htab_delete (cfun->gimple_df->default_defs); |
| 1183 cfun->gimple_df->default_defs = NULL; | |
|
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|
1184 pt_solution_reset (&cfun->gimple_df->escaped); |
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1185 if (cfun->gimple_df->decls_to_pointers != NULL) |
|
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|
1186 pointer_map_destroy (cfun->gimple_df->decls_to_pointers); |
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1187 cfun->gimple_df->decls_to_pointers = NULL; |
| 0 | 1188 cfun->gimple_df->modified_noreturn_calls = NULL; |
| 1189 cfun->gimple_df = NULL; | |
| 1190 | |
| 1191 /* We no longer need the edge variable maps. */ | |
| 1192 redirect_edge_var_map_destroy (); | |
| 1193 } | |
| 1194 | |
| 1195 /* Return true if the conversion from INNER_TYPE to OUTER_TYPE is a | |
| 1196 useless type conversion, otherwise return false. | |
| 1197 | |
| 1198 This function implicitly defines the middle-end type system. With | |
| 1199 the notion of 'a < b' meaning that useless_type_conversion_p (a, b) | |
| 1200 holds and 'a > b' meaning that useless_type_conversion_p (b, a) holds, | |
| 1201 the following invariants shall be fulfilled: | |
| 1202 | |
| 1203 1) useless_type_conversion_p is transitive. | |
| 1204 If a < b and b < c then a < c. | |
| 1205 | |
| 1206 2) useless_type_conversion_p is not symmetric. | |
| 1207 From a < b does not follow a > b. | |
| 1208 | |
| 1209 3) Types define the available set of operations applicable to values. | |
| 1210 A type conversion is useless if the operations for the target type | |
| 1211 is a subset of the operations for the source type. For example | |
| 1212 casts to void* are useless, casts from void* are not (void* can't | |
| 1213 be dereferenced or offsetted, but copied, hence its set of operations | |
| 1214 is a strict subset of that of all other data pointer types). Casts | |
| 1215 to const T* are useless (can't be written to), casts from const T* | |
| 1216 to T* are not. */ | |
| 1217 | |
| 1218 bool | |
| 1219 useless_type_conversion_p (tree outer_type, tree inner_type) | |
| 1220 { | |
|
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1221 /* Do the following before stripping toplevel qualifiers. */ |
| 0 | 1222 if (POINTER_TYPE_P (inner_type) |
|
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1223 && POINTER_TYPE_P (outer_type)) |
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1224 { |
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1225 /* Do not lose casts between pointers to different address spaces. */ |
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1226 if (TYPE_ADDR_SPACE (TREE_TYPE (outer_type)) |
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1227 != TYPE_ADDR_SPACE (TREE_TYPE (inner_type))) |
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1228 return false; |
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|
1229 |
|
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1230 /* Do not lose casts to restrict qualified pointers. */ |
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1231 if ((TYPE_RESTRICT (outer_type) |
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1232 != TYPE_RESTRICT (inner_type)) |
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|
1233 && TYPE_RESTRICT (outer_type)) |
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1234 return false; |
|
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|
1235 |
|
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1236 /* If the outer type is (void *) or a pointer to an incomplete |
|
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1237 record type or a pointer to an unprototyped function, |
|
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|
1238 then the conversion is not necessary. */ |
|
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1239 if (VOID_TYPE_P (TREE_TYPE (outer_type)) |
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|
1240 || ((TREE_CODE (TREE_TYPE (outer_type)) == FUNCTION_TYPE |
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1241 || TREE_CODE (TREE_TYPE (outer_type)) == METHOD_TYPE) |
|
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changeset
|
1242 && (TREE_CODE (TREE_TYPE (outer_type)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1243 == TREE_CODE (TREE_TYPE (inner_type))) |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1244 && !prototype_p (TREE_TYPE (outer_type)) |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1245 && useless_type_conversion_p (TREE_TYPE (TREE_TYPE (outer_type)), |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1246 TREE_TYPE (TREE_TYPE (inner_type))))) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1247 return true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1248 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1249 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1250 /* From now on qualifiers on value types do not matter. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1251 inner_type = TYPE_MAIN_VARIANT (inner_type); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1252 outer_type = TYPE_MAIN_VARIANT (outer_type); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1253 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1254 if (inner_type == outer_type) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1255 return true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1256 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1257 /* If we know the canonical types, compare them. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1258 if (TYPE_CANONICAL (inner_type) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1259 && TYPE_CANONICAL (inner_type) == TYPE_CANONICAL (outer_type)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1260 return true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1261 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1262 /* Changes in machine mode are never useless conversions unless we |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1263 deal with aggregate types in which case we defer to later checks. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1264 if (TYPE_MODE (inner_type) != TYPE_MODE (outer_type) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1265 && !AGGREGATE_TYPE_P (inner_type)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1266 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1267 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1268 /* If both the inner and outer types are integral types, then the |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1269 conversion is not necessary if they have the same mode and |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1270 signedness and precision, and both or neither are boolean. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1271 if (INTEGRAL_TYPE_P (inner_type) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1272 && INTEGRAL_TYPE_P (outer_type)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1273 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1274 /* Preserve changes in signedness or precision. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1275 if (TYPE_UNSIGNED (inner_type) != TYPE_UNSIGNED (outer_type) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1276 || TYPE_PRECISION (inner_type) != TYPE_PRECISION (outer_type)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1277 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1278 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1279 /* We don't need to preserve changes in the types minimum or |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1280 maximum value in general as these do not generate code |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1281 unless the types precisions are different. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1282 return true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1283 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1284 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1285 /* Scalar floating point types with the same mode are compatible. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1286 else if (SCALAR_FLOAT_TYPE_P (inner_type) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1287 && SCALAR_FLOAT_TYPE_P (outer_type)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1288 return true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1289 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1290 /* Fixed point types with the same mode are compatible. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1291 else if (FIXED_POINT_TYPE_P (inner_type) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1292 && FIXED_POINT_TYPE_P (outer_type)) |
| 0 | 1293 return true; |
| 1294 | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1295 /* We need to take special care recursing to pointed-to types. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1296 else if (POINTER_TYPE_P (inner_type) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1297 && POINTER_TYPE_P (outer_type)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1298 { |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1299 /* Do not lose casts to function pointer types. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1300 if ((TREE_CODE (TREE_TYPE (outer_type)) == FUNCTION_TYPE |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1301 || TREE_CODE (TREE_TYPE (outer_type)) == METHOD_TYPE) |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1302 && !useless_type_conversion_p (TREE_TYPE (outer_type), |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1303 TREE_TYPE (inner_type))) |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1304 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1305 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1306 /* We do not care for const qualification of the pointed-to types |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1307 as const qualification has no semantic value to the middle-end. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1308 |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1309 /* Otherwise pointers/references are equivalent. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1310 return true; |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1311 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1312 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1313 /* Recurse for complex types. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1314 else if (TREE_CODE (inner_type) == COMPLEX_TYPE |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1315 && TREE_CODE (outer_type) == COMPLEX_TYPE) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1316 return useless_type_conversion_p (TREE_TYPE (outer_type), |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1317 TREE_TYPE (inner_type)); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1318 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1319 /* Recurse for vector types with the same number of subparts. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1320 else if (TREE_CODE (inner_type) == VECTOR_TYPE |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1321 && TREE_CODE (outer_type) == VECTOR_TYPE |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1322 && TYPE_PRECISION (inner_type) == TYPE_PRECISION (outer_type)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1323 return useless_type_conversion_p (TREE_TYPE (outer_type), |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1324 TREE_TYPE (inner_type)); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1325 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1326 else if (TREE_CODE (inner_type) == ARRAY_TYPE |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1327 && TREE_CODE (outer_type) == ARRAY_TYPE) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1328 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1329 /* Preserve string attributes. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1330 if (TYPE_STRING_FLAG (inner_type) != TYPE_STRING_FLAG (outer_type)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1331 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1332 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1333 /* Conversions from array types with unknown extent to |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1334 array types with known extent are not useless. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1335 if (!TYPE_DOMAIN (inner_type) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1336 && TYPE_DOMAIN (outer_type)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1337 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1338 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1339 /* Nor are conversions from array types with non-constant size to |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1340 array types with constant size or to different size. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1341 if (TYPE_SIZE (outer_type) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1342 && TREE_CODE (TYPE_SIZE (outer_type)) == INTEGER_CST |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1343 && (!TYPE_SIZE (inner_type) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1344 || TREE_CODE (TYPE_SIZE (inner_type)) != INTEGER_CST |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1345 || !tree_int_cst_equal (TYPE_SIZE (outer_type), |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1346 TYPE_SIZE (inner_type)))) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1347 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1348 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1349 /* Check conversions between arrays with partially known extents. |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1350 If the array min/max values are constant they have to match. |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1351 Otherwise allow conversions to unknown and variable extents. |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1352 In particular this declares conversions that may change the |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1353 mode to BLKmode as useless. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1354 if (TYPE_DOMAIN (inner_type) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1355 && TYPE_DOMAIN (outer_type) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1356 && TYPE_DOMAIN (inner_type) != TYPE_DOMAIN (outer_type)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1357 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1358 tree inner_min = TYPE_MIN_VALUE (TYPE_DOMAIN (inner_type)); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1359 tree outer_min = TYPE_MIN_VALUE (TYPE_DOMAIN (outer_type)); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1360 tree inner_max = TYPE_MAX_VALUE (TYPE_DOMAIN (inner_type)); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1361 tree outer_max = TYPE_MAX_VALUE (TYPE_DOMAIN (outer_type)); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1362 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1363 /* After gimplification a variable min/max value carries no |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1364 additional information compared to a NULL value. All that |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1365 matters has been lowered to be part of the IL. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1366 if (inner_min && TREE_CODE (inner_min) != INTEGER_CST) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1367 inner_min = NULL_TREE; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1368 if (outer_min && TREE_CODE (outer_min) != INTEGER_CST) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1369 outer_min = NULL_TREE; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1370 if (inner_max && TREE_CODE (inner_max) != INTEGER_CST) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1371 inner_max = NULL_TREE; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1372 if (outer_max && TREE_CODE (outer_max) != INTEGER_CST) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1373 outer_max = NULL_TREE; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1374 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1375 /* Conversions NULL / variable <- cst are useless, but not |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1376 the other way around. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1377 if (outer_min |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1378 && (!inner_min |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1379 || !tree_int_cst_equal (inner_min, outer_min))) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1380 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1381 if (outer_max |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1382 && (!inner_max |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1383 || !tree_int_cst_equal (inner_max, outer_max))) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1384 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1385 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1386 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1387 /* Recurse on the element check. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1388 return useless_type_conversion_p (TREE_TYPE (outer_type), |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1389 TREE_TYPE (inner_type)); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1390 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1391 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1392 else if ((TREE_CODE (inner_type) == FUNCTION_TYPE |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1393 || TREE_CODE (inner_type) == METHOD_TYPE) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1394 && TREE_CODE (inner_type) == TREE_CODE (outer_type)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1395 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1396 tree outer_parm, inner_parm; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1397 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1398 /* If the return types are not compatible bail out. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1399 if (!useless_type_conversion_p (TREE_TYPE (outer_type), |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1400 TREE_TYPE (inner_type))) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1401 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1402 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1403 /* Method types should belong to a compatible base class. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1404 if (TREE_CODE (inner_type) == METHOD_TYPE |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1405 && !useless_type_conversion_p (TYPE_METHOD_BASETYPE (outer_type), |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1406 TYPE_METHOD_BASETYPE (inner_type))) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1407 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1408 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1409 /* A conversion to an unprototyped argument list is ok. */ |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1410 if (!prototype_p (outer_type)) |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1411 return true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1412 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1413 /* If the unqualified argument types are compatible the conversion |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1414 is useless. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1415 if (TYPE_ARG_TYPES (outer_type) == TYPE_ARG_TYPES (inner_type)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1416 return true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1417 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1418 for (outer_parm = TYPE_ARG_TYPES (outer_type), |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1419 inner_parm = TYPE_ARG_TYPES (inner_type); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1420 outer_parm && inner_parm; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1421 outer_parm = TREE_CHAIN (outer_parm), |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1422 inner_parm = TREE_CHAIN (inner_parm)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1423 if (!useless_type_conversion_p |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1424 (TYPE_MAIN_VARIANT (TREE_VALUE (outer_parm)), |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1425 TYPE_MAIN_VARIANT (TREE_VALUE (inner_parm)))) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1426 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1427 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1428 /* If there is a mismatch in the number of arguments the functions |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1429 are not compatible. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1430 if (outer_parm || inner_parm) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1431 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1432 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1433 /* Defer to the target if necessary. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1434 if (TYPE_ATTRIBUTES (inner_type) || TYPE_ATTRIBUTES (outer_type)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1435 return targetm.comp_type_attributes (outer_type, inner_type) != 0; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1436 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1437 return true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1438 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1439 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1440 /* For aggregates we rely on TYPE_CANONICAL exclusively and require |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
36
diff
changeset
|
1441 explicit conversions for types involving to be structurally |
|
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1442 compared types. */ |
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1443 else if (AGGREGATE_TYPE_P (inner_type) |
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1444 && TREE_CODE (inner_type) == TREE_CODE (outer_type)) |
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1445 return false; |
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1446 |
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1447 return false; |
| 0 | 1448 } |
| 1449 | |
| 1450 /* Return true if a conversion from either type of TYPE1 and TYPE2 | |
| 1451 to the other is not required. Otherwise return false. */ | |
| 1452 | |
| 1453 bool | |
| 1454 types_compatible_p (tree type1, tree type2) | |
| 1455 { | |
| 1456 return (type1 == type2 | |
| 1457 || (useless_type_conversion_p (type1, type2) | |
| 1458 && useless_type_conversion_p (type2, type1))); | |
| 1459 } | |
| 1460 | |
| 1461 /* Return true if EXPR is a useless type conversion, otherwise return | |
| 1462 false. */ | |
| 1463 | |
| 1464 bool | |
| 1465 tree_ssa_useless_type_conversion (tree expr) | |
| 1466 { | |
| 1467 /* If we have an assignment that merely uses a NOP_EXPR to change | |
| 1468 the top of the RHS to the type of the LHS and the type conversion | |
| 1469 is "safe", then strip away the type conversion so that we can | |
| 1470 enter LHS = RHS into the const_and_copies table. */ | |
| 1471 if (CONVERT_EXPR_P (expr) | |
| 1472 || TREE_CODE (expr) == VIEW_CONVERT_EXPR | |
| 1473 || TREE_CODE (expr) == NON_LVALUE_EXPR) | |
| 1474 return useless_type_conversion_p | |
| 1475 (TREE_TYPE (expr), | |
| 1476 TREE_TYPE (TREE_OPERAND (expr, 0))); | |
| 1477 | |
| 1478 return false; | |
| 1479 } | |
| 1480 | |
|
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1481 /* Strip conversions from EXP according to |
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1482 tree_ssa_useless_type_conversion and return the resulting |
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1483 expression. */ |
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1484 |
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1485 tree |
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1486 tree_ssa_strip_useless_type_conversions (tree exp) |
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1487 { |
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1488 while (tree_ssa_useless_type_conversion (exp)) |
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1489 exp = TREE_OPERAND (exp, 0); |
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1490 return exp; |
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1491 } |
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1492 |
| 0 | 1493 |
| 1494 /* Internal helper for walk_use_def_chains. VAR, FN and DATA are as | |
| 1495 described in walk_use_def_chains. | |
|
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1496 |
| 0 | 1497 VISITED is a pointer set used to mark visited SSA_NAMEs to avoid |
| 1498 infinite loops. We used to have a bitmap for this to just mark | |
| 1499 SSA versions we had visited. But non-sparse bitmaps are way too | |
| 1500 expensive, while sparse bitmaps may cause quadratic behavior. | |
| 1501 | |
| 1502 IS_DFS is true if the caller wants to perform a depth-first search | |
| 1503 when visiting PHI nodes. A DFS will visit each PHI argument and | |
| 1504 call FN after each one. Otherwise, all the arguments are | |
| 1505 visited first and then FN is called with each of the visited | |
| 1506 arguments in a separate pass. */ | |
| 1507 | |
| 1508 static bool | |
| 1509 walk_use_def_chains_1 (tree var, walk_use_def_chains_fn fn, void *data, | |
| 1510 struct pointer_set_t *visited, bool is_dfs) | |
| 1511 { | |
| 1512 gimple def_stmt; | |
| 1513 | |
| 1514 if (pointer_set_insert (visited, var)) | |
| 1515 return false; | |
| 1516 | |
| 1517 def_stmt = SSA_NAME_DEF_STMT (var); | |
| 1518 | |
| 1519 if (gimple_code (def_stmt) != GIMPLE_PHI) | |
| 1520 { | |
| 1521 /* If we reached the end of the use-def chain, call FN. */ | |
| 1522 return fn (var, def_stmt, data); | |
| 1523 } | |
| 1524 else | |
| 1525 { | |
| 1526 size_t i; | |
| 1527 | |
| 1528 /* When doing a breadth-first search, call FN before following the | |
| 1529 use-def links for each argument. */ | |
| 1530 if (!is_dfs) | |
| 1531 for (i = 0; i < gimple_phi_num_args (def_stmt); i++) | |
| 1532 if (fn (gimple_phi_arg_def (def_stmt, i), def_stmt, data)) | |
| 1533 return true; | |
| 1534 | |
| 1535 /* Follow use-def links out of each PHI argument. */ | |
| 1536 for (i = 0; i < gimple_phi_num_args (def_stmt); i++) | |
| 1537 { | |
| 1538 tree arg = gimple_phi_arg_def (def_stmt, i); | |
| 1539 | |
| 1540 /* ARG may be NULL for newly introduced PHI nodes. */ | |
| 1541 if (arg | |
| 1542 && TREE_CODE (arg) == SSA_NAME | |
| 1543 && walk_use_def_chains_1 (arg, fn, data, visited, is_dfs)) | |
| 1544 return true; | |
| 1545 } | |
| 1546 | |
| 1547 /* When doing a depth-first search, call FN after following the | |
| 1548 use-def links for each argument. */ | |
| 1549 if (is_dfs) | |
| 1550 for (i = 0; i < gimple_phi_num_args (def_stmt); i++) | |
| 1551 if (fn (gimple_phi_arg_def (def_stmt, i), def_stmt, data)) | |
| 1552 return true; | |
| 1553 } | |
|
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1554 |
| 0 | 1555 return false; |
| 1556 } | |
|
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1557 |
| 0 | 1558 |
| 1559 | |
| 1560 /* Walk use-def chains starting at the SSA variable VAR. Call | |
| 1561 function FN at each reaching definition found. FN takes three | |
| 1562 arguments: VAR, its defining statement (DEF_STMT) and a generic | |
| 1563 pointer to whatever state information that FN may want to maintain | |
| 1564 (DATA). FN is able to stop the walk by returning true, otherwise | |
|
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1565 in order to continue the walk, FN should return false. |
| 0 | 1566 |
| 1567 Note, that if DEF_STMT is a PHI node, the semantics are slightly | |
| 1568 different. The first argument to FN is no longer the original | |
| 1569 variable VAR, but the PHI argument currently being examined. If FN | |
| 1570 wants to get at VAR, it should call PHI_RESULT (PHI). | |
| 1571 | |
| 1572 If IS_DFS is true, this function will: | |
| 1573 | |
| 1574 1- walk the use-def chains for all the PHI arguments, and, | |
| 1575 2- call (*FN) (ARG, PHI, DATA) on all the PHI arguments. | |
| 1576 | |
| 1577 If IS_DFS is false, the two steps above are done in reverse order | |
| 1578 (i.e., a breadth-first search). */ | |
| 1579 | |
| 1580 void | |
| 1581 walk_use_def_chains (tree var, walk_use_def_chains_fn fn, void *data, | |
| 1582 bool is_dfs) | |
| 1583 { | |
| 1584 gimple def_stmt; | |
| 1585 | |
| 1586 gcc_assert (TREE_CODE (var) == SSA_NAME); | |
| 1587 | |
| 1588 def_stmt = SSA_NAME_DEF_STMT (var); | |
| 1589 | |
| 1590 /* We only need to recurse if the reaching definition comes from a PHI | |
| 1591 node. */ | |
| 1592 if (gimple_code (def_stmt) != GIMPLE_PHI) | |
| 1593 (*fn) (var, def_stmt, data); | |
| 1594 else | |
| 1595 { | |
| 1596 struct pointer_set_t *visited = pointer_set_create (); | |
| 1597 walk_use_def_chains_1 (var, fn, data, visited, is_dfs); | |
| 1598 pointer_set_destroy (visited); | |
| 1599 } | |
| 1600 } | |
| 1601 | |
| 1602 | |
| 1603 /* Emit warnings for uninitialized variables. This is done in two passes. | |
| 1604 | |
| 1605 The first pass notices real uses of SSA names with undefined values. | |
| 1606 Such uses are unconditionally uninitialized, and we can be certain that | |
| 1607 such a use is a mistake. This pass is run before most optimizations, | |
| 1608 so that we catch as many as we can. | |
| 1609 | |
| 1610 The second pass follows PHI nodes to find uses that are potentially | |
| 1611 uninitialized. In this case we can't necessarily prove that the use | |
| 1612 is really uninitialized. This pass is run after most optimizations, | |
| 1613 so that we thread as many jumps and possible, and delete as much dead | |
| 1614 code as possible, in order to reduce false positives. We also look | |
| 1615 again for plain uninitialized variables, since optimization may have | |
| 1616 changed conditionally uninitialized to unconditionally uninitialized. */ | |
| 1617 | |
| 1618 /* Emit a warning for T, an SSA_NAME, being uninitialized. The exact | |
| 1619 warning text is in MSGID and LOCUS may contain a location or be null. */ | |
| 1620 | |
|
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1621 void |
| 0 | 1622 warn_uninit (tree t, const char *gmsgid, void *data) |
| 1623 { | |
| 1624 tree var = SSA_NAME_VAR (t); | |
| 1625 gimple context = (gimple) data; | |
| 1626 location_t location; | |
| 1627 expanded_location xloc, floc; | |
| 1628 | |
| 1629 if (!ssa_undefined_value_p (t)) | |
| 1630 return; | |
| 1631 | |
| 1632 /* TREE_NO_WARNING either means we already warned, or the front end | |
| 1633 wishes to suppress the warning. */ | |
| 1634 if (TREE_NO_WARNING (var)) | |
| 1635 return; | |
| 1636 | |
| 1637 /* Do not warn if it can be initialized outside this module. */ | |
| 1638 if (is_global_var (var)) | |
| 1639 return; | |
|
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1640 |
| 0 | 1641 location = (context != NULL && gimple_has_location (context)) |
| 1642 ? gimple_location (context) | |
| 1643 : DECL_SOURCE_LOCATION (var); | |
| 1644 xloc = expand_location (location); | |
| 1645 floc = expand_location (DECL_SOURCE_LOCATION (cfun->decl)); | |
| 1646 if (warning_at (location, OPT_Wuninitialized, gmsgid, var)) | |
| 1647 { | |
| 1648 TREE_NO_WARNING (var) = 1; | |
| 1649 | |
|
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1650 if (location == DECL_SOURCE_LOCATION (var)) |
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1651 return; |
| 0 | 1652 if (xloc.file != floc.file |
| 1653 || xloc.line < floc.line | |
| 1654 || xloc.line > LOCATION_LINE (cfun->function_end_locus)) | |
|
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1655 inform (DECL_SOURCE_LOCATION (var), "%qD was declared here", var); |
| 0 | 1656 } |
| 1657 } | |
| 1658 | |
| 1659 struct walk_data { | |
| 1660 gimple stmt; | |
| 1661 bool always_executed; | |
| 1662 bool warn_possibly_uninitialized; | |
| 1663 }; | |
| 1664 | |
| 1665 /* Called via walk_tree, look for SSA_NAMEs that have empty definitions | |
| 1666 and warn about them. */ | |
| 1667 | |
| 1668 static tree | |
| 1669 warn_uninitialized_var (tree *tp, int *walk_subtrees, void *data_) | |
| 1670 { | |
| 1671 struct walk_stmt_info *wi = (struct walk_stmt_info *) data_; | |
| 1672 struct walk_data *data = (struct walk_data *) wi->info; | |
| 1673 tree t = *tp; | |
| 1674 | |
| 1675 /* We do not care about LHS. */ | |
| 1676 if (wi->is_lhs) | |
| 36 | 1677 { |
|
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1678 /* Except for operands of dereferences. */ |
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1679 if (!INDIRECT_REF_P (t) |
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1680 && TREE_CODE (t) != MEM_REF) |
| 36 | 1681 return NULL_TREE; |
| 1682 t = TREE_OPERAND (t, 0); | |
| 1683 } | |
| 0 | 1684 |
| 1685 switch (TREE_CODE (t)) | |
| 1686 { | |
| 1687 case ADDR_EXPR: | |
| 1688 /* Taking the address of an uninitialized variable does not | |
| 1689 count as using it. */ | |
| 1690 *walk_subtrees = 0; | |
| 1691 break; | |
| 1692 | |
| 1693 case VAR_DECL: | |
| 1694 { | |
| 1695 /* A VAR_DECL in the RHS of a gimple statement may mean that | |
| 1696 this variable is loaded from memory. */ | |
| 1697 use_operand_p vuse; | |
| 1698 tree op; | |
| 1699 | |
|
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1700 /* If there is not gimple stmt, |
| 0 | 1701 or alias information has not been computed, |
| 1702 then we cannot check VUSE ops. */ | |
|
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1703 if (data->stmt == NULL) |
| 0 | 1704 return NULL_TREE; |
| 1705 | |
| 1706 /* If the load happens as part of a call do not warn about it. */ | |
| 1707 if (is_gimple_call (data->stmt)) | |
| 1708 return NULL_TREE; | |
| 1709 | |
|
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1710 vuse = gimple_vuse_op (data->stmt); |
| 0 | 1711 if (vuse == NULL_USE_OPERAND_P) |
| 1712 return NULL_TREE; | |
| 1713 | |
| 1714 op = USE_FROM_PTR (vuse); | |
|
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1715 if (t != SSA_NAME_VAR (op) |
| 0 | 1716 || !SSA_NAME_IS_DEFAULT_DEF (op)) |
| 1717 return NULL_TREE; | |
| 1718 /* If this is a VUSE of t and it is the default definition, | |
| 1719 then warn about op. */ | |
| 1720 t = op; | |
| 1721 /* Fall through into SSA_NAME. */ | |
| 1722 } | |
| 1723 | |
| 1724 case SSA_NAME: | |
| 1725 /* We only do data flow with SSA_NAMEs, so that's all we | |
| 1726 can warn about. */ | |
| 1727 if (data->always_executed) | |
| 1728 warn_uninit (t, "%qD is used uninitialized in this function", | |
| 1729 data->stmt); | |
| 1730 else if (data->warn_possibly_uninitialized) | |
| 1731 warn_uninit (t, "%qD may be used uninitialized in this function", | |
| 1732 data->stmt); | |
| 1733 *walk_subtrees = 0; | |
| 1734 break; | |
| 1735 | |
| 1736 case REALPART_EXPR: | |
| 1737 case IMAGPART_EXPR: | |
| 1738 /* The total store transformation performed during gimplification | |
| 1739 creates uninitialized variable uses. If all is well, these will | |
| 1740 be optimized away, so don't warn now. */ | |
| 1741 if (TREE_CODE (TREE_OPERAND (t, 0)) == SSA_NAME) | |
| 1742 *walk_subtrees = 0; | |
| 1743 break; | |
| 1744 | |
| 1745 default: | |
| 1746 if (IS_TYPE_OR_DECL_P (t)) | |
| 1747 *walk_subtrees = 0; | |
| 1748 break; | |
| 1749 } | |
| 1750 | |
| 1751 return NULL_TREE; | |
| 1752 } | |
| 1753 | |
|
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1754 unsigned int |
| 0 | 1755 warn_uninitialized_vars (bool warn_possibly_uninitialized) |
| 1756 { | |
| 1757 gimple_stmt_iterator gsi; | |
| 1758 basic_block bb; | |
| 1759 struct walk_data data; | |
| 1760 | |
| 1761 data.warn_possibly_uninitialized = warn_possibly_uninitialized; | |
| 1762 | |
| 1763 | |
| 1764 FOR_EACH_BB (bb) | |
| 1765 { | |
| 1766 data.always_executed = dominated_by_p (CDI_POST_DOMINATORS, | |
| 1767 single_succ (ENTRY_BLOCK_PTR), bb); | |
| 1768 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 1769 { | |
| 1770 struct walk_stmt_info wi; | |
| 1771 data.stmt = gsi_stmt (gsi); | |
|
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1772 if (is_gimple_debug (data.stmt)) |
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1773 continue; |
| 0 | 1774 memset (&wi, 0, sizeof (wi)); |
| 1775 wi.info = &data; | |
| 1776 walk_gimple_op (gsi_stmt (gsi), warn_uninitialized_var, &wi); | |
| 1777 } | |
| 1778 } | |
| 1779 | |
| 1780 return 0; | |
| 1781 } | |
| 1782 | |
| 1783 static unsigned int | |
| 1784 execute_early_warn_uninitialized (void) | |
| 1785 { | |
| 1786 /* Currently, this pass runs always but | |
| 1787 execute_late_warn_uninitialized only runs with optimization. With | |
| 1788 optimization we want to warn about possible uninitialized as late | |
| 1789 as possible, thus don't do it here. However, without | |
| 1790 optimization we need to warn here about "may be uninitialized". | |
| 1791 */ | |
|
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1792 calculate_dominance_info (CDI_POST_DOMINATORS); |
| 0 | 1793 |
|
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1794 warn_uninitialized_vars (/*warn_possibly_uninitialized=*/!optimize); |
| 0 | 1795 |
|
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1796 /* Post-dominator information can not be reliably updated. Free it |
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1797 after the use. */ |
| 0 | 1798 |
|
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1799 free_dominance_info (CDI_POST_DOMINATORS); |
| 0 | 1800 return 0; |
| 1801 } | |
| 1802 | |
| 1803 static bool | |
| 1804 gate_warn_uninitialized (void) | |
| 1805 { | |
| 1806 return warn_uninitialized != 0; | |
| 1807 } | |
| 1808 | |
| 1809 struct gimple_opt_pass pass_early_warn_uninitialized = | |
| 1810 { | |
| 1811 { | |
| 1812 GIMPLE_PASS, | |
|
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1813 "*early_warn_uninitialized", /* name */ |
| 0 | 1814 gate_warn_uninitialized, /* gate */ |
| 1815 execute_early_warn_uninitialized, /* execute */ | |
| 1816 NULL, /* sub */ | |
| 1817 NULL, /* next */ | |
| 1818 0, /* static_pass_number */ | |
|
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1819 TV_TREE_UNINIT, /* tv_id */ |
| 0 | 1820 PROP_ssa, /* properties_required */ |
| 1821 0, /* properties_provided */ | |
| 1822 0, /* properties_destroyed */ | |
| 1823 0, /* todo_flags_start */ | |
| 1824 0 /* todo_flags_finish */ | |
| 1825 } | |
| 1826 }; | |
| 1827 | |
|
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1828 |
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1829 /* If necessary, rewrite the base of the reference tree *TP from |
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1830 a MEM_REF to a plain or converted symbol. */ |
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1831 |
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1832 static void |
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1833 maybe_rewrite_mem_ref_base (tree *tp) |
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1834 { |
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1835 tree sym; |
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1836 |
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1837 while (handled_component_p (*tp)) |
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1838 tp = &TREE_OPERAND (*tp, 0); |
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1839 if (TREE_CODE (*tp) == MEM_REF |
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1840 && TREE_CODE (TREE_OPERAND (*tp, 0)) == ADDR_EXPR |
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1841 && integer_zerop (TREE_OPERAND (*tp, 1)) |
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1842 && (sym = TREE_OPERAND (TREE_OPERAND (*tp, 0), 0)) |
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1843 && DECL_P (sym) |
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1844 && !TREE_ADDRESSABLE (sym) |
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1845 && symbol_marked_for_renaming (sym)) |
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1846 { |
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1847 if (!useless_type_conversion_p (TREE_TYPE (*tp), |
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1848 TREE_TYPE (sym))) |
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1849 *tp = build1 (VIEW_CONVERT_EXPR, |
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1850 TREE_TYPE (*tp), sym); |
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1851 else |
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1852 *tp = sym; |
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1853 } |
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1854 } |
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1855 |
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1856 /* For a tree REF return its base if it is the base of a MEM_REF |
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1857 that cannot be rewritten into SSA form. Otherwise return NULL_TREE. */ |
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1858 |
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1859 static tree |
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1860 non_rewritable_mem_ref_base (tree ref) |
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1861 { |
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1862 tree base = ref; |
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1863 |
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1864 /* A plain decl does not need it set. */ |
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1865 if (DECL_P (ref)) |
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1866 return NULL_TREE; |
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1867 |
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1868 while (handled_component_p (base)) |
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1869 base = TREE_OPERAND (base, 0); |
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1870 |
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1871 /* But watch out for MEM_REFs we cannot lower to a |
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1872 VIEW_CONVERT_EXPR. */ |
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1873 if (TREE_CODE (base) == MEM_REF |
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1874 && TREE_CODE (TREE_OPERAND (base, 0)) == ADDR_EXPR) |
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1875 { |
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1876 tree decl = TREE_OPERAND (TREE_OPERAND (base, 0), 0); |
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1877 if (DECL_P (decl) |
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1878 && (!integer_zerop (TREE_OPERAND (base, 1)) |
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1879 || (DECL_SIZE (decl) |
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1880 != TYPE_SIZE (TREE_TYPE (base))) |
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1881 || TREE_THIS_VOLATILE (decl) != TREE_THIS_VOLATILE (base))) |
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1882 return decl; |
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1883 } |
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1884 |
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1885 return NULL_TREE; |
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1886 } |
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1887 |
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1888 /* For an lvalue tree LHS return true if it cannot be rewritten into SSA form. |
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1889 Otherwise return true. */ |
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1890 |
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1891 static bool |
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1892 non_rewritable_lvalue_p (tree lhs) |
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1893 { |
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1894 /* A plain decl is always rewritable. */ |
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1895 if (DECL_P (lhs)) |
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1896 return false; |
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1897 |
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1898 /* A decl that is wrapped inside a MEM-REF that covers |
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1899 it full is also rewritable. |
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1900 ??? The following could be relaxed allowing component |
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1901 references that do not change the access size. */ |
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1902 if (TREE_CODE (lhs) == MEM_REF |
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1903 && TREE_CODE (TREE_OPERAND (lhs, 0)) == ADDR_EXPR |
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1904 && integer_zerop (TREE_OPERAND (lhs, 1))) |
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1905 { |
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1906 tree decl = TREE_OPERAND (TREE_OPERAND (lhs, 0), 0); |
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1907 if (DECL_P (decl) |
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1908 && DECL_SIZE (decl) == TYPE_SIZE (TREE_TYPE (lhs)) |
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1909 && (TREE_THIS_VOLATILE (decl) == TREE_THIS_VOLATILE (lhs))) |
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1910 return false; |
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1911 } |
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1912 |
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1913 return true; |
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1914 } |
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1915 |
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1916 /* When possible, clear TREE_ADDRESSABLE bit or set DECL_GIMPLE_REG_P bit and |
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1917 mark the variable VAR for conversion into SSA. Return true when updating |
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1918 stmts is required. */ |
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1919 |
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1920 static bool |
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1921 maybe_optimize_var (tree var, bitmap addresses_taken, bitmap not_reg_needs) |
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1922 { |
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1923 bool update_vops = false; |
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1924 |
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1925 /* Global Variables, result decls cannot be changed. */ |
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1926 if (is_global_var (var) |
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1927 || TREE_CODE (var) == RESULT_DECL |
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1928 || bitmap_bit_p (addresses_taken, DECL_UID (var))) |
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1929 return false; |
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1930 |
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1931 /* If the variable is not in the list of referenced vars then we |
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1932 do not need to touch it nor can we rename it. */ |
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1933 if (!referenced_var_lookup (cfun, DECL_UID (var))) |
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1934 return false; |
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1935 |
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1936 if (TREE_ADDRESSABLE (var) |
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1937 /* Do not change TREE_ADDRESSABLE if we need to preserve var as |
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1938 a non-register. Otherwise we are confused and forget to |
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1939 add virtual operands for it. */ |
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1940 && (!is_gimple_reg_type (TREE_TYPE (var)) |
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1941 || !bitmap_bit_p (not_reg_needs, DECL_UID (var)))) |
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1942 { |
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1943 TREE_ADDRESSABLE (var) = 0; |
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1944 if (is_gimple_reg (var)) |
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1945 mark_sym_for_renaming (var); |
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1946 update_vops = true; |
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1947 if (dump_file) |
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1948 { |
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1949 fprintf (dump_file, "No longer having address taken: "); |
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1950 print_generic_expr (dump_file, var, 0); |
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1951 fprintf (dump_file, "\n"); |
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1952 } |
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1953 } |
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1954 |
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1955 if (!DECL_GIMPLE_REG_P (var) |
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1956 && !bitmap_bit_p (not_reg_needs, DECL_UID (var)) |
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1957 && (TREE_CODE (TREE_TYPE (var)) == COMPLEX_TYPE |
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1958 || TREE_CODE (TREE_TYPE (var)) == VECTOR_TYPE) |
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1959 && !TREE_THIS_VOLATILE (var) |
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1960 && (TREE_CODE (var) != VAR_DECL || !DECL_HARD_REGISTER (var))) |
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1961 { |
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1962 DECL_GIMPLE_REG_P (var) = 1; |
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1963 mark_sym_for_renaming (var); |
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1964 update_vops = true; |
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1965 if (dump_file) |
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1966 { |
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1967 fprintf (dump_file, "Now a gimple register: "); |
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1968 print_generic_expr (dump_file, var, 0); |
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1969 fprintf (dump_file, "\n"); |
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1970 } |
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1971 } |
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1972 |
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1973 return update_vops; |
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1974 } |
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1975 |
| 0 | 1976 /* Compute TREE_ADDRESSABLE and DECL_GIMPLE_REG_P for local variables. */ |
| 1977 | |
|
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1978 void |
|
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1979 execute_update_addresses_taken (void) |
| 0 | 1980 { |
| 1981 gimple_stmt_iterator gsi; | |
| 1982 basic_block bb; | |
| 1983 bitmap addresses_taken = BITMAP_ALLOC (NULL); | |
| 1984 bitmap not_reg_needs = BITMAP_ALLOC (NULL); | |
| 1985 bool update_vops = false; | |
|
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1986 tree var; |
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1987 unsigned i; |
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1988 |
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1989 timevar_push (TV_ADDRESS_TAKEN); |
| 0 | 1990 |
| 1991 /* Collect into ADDRESSES_TAKEN all variables whose address is taken within | |
| 1992 the function body. */ | |
| 1993 FOR_EACH_BB (bb) | |
| 1994 { | |
| 1995 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 1996 { | |
|
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1997 gimple stmt = gsi_stmt (gsi); |
| 0 | 1998 enum gimple_code code = gimple_code (stmt); |
|
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1999 tree decl; |
|
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2000 |
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2001 /* Note all addresses taken by the stmt. */ |
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2002 gimple_ior_addresses_taken (addresses_taken, stmt); |
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2003 |
| 0 | 2004 /* If we have a call or an assignment, see if the lhs contains |
| 2005 a local decl that requires not to be a gimple register. */ | |
| 2006 if (code == GIMPLE_ASSIGN || code == GIMPLE_CALL) | |
| 2007 { | |
|
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2008 tree lhs = gimple_get_lhs (stmt); |
|
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2009 if (lhs |
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2010 && TREE_CODE (lhs) != SSA_NAME |
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2011 && non_rewritable_lvalue_p (lhs)) |
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2012 { |
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2013 decl = get_base_address (lhs); |
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2014 if (DECL_P (decl)) |
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2015 bitmap_set_bit (not_reg_needs, DECL_UID (decl)); |
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2016 } |
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2017 } |
|
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|
2018 |
|
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2019 if (gimple_assign_single_p (stmt)) |
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2020 { |
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2021 tree rhs = gimple_assign_rhs1 (stmt); |
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2022 if ((decl = non_rewritable_mem_ref_base (rhs))) |
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2023 bitmap_set_bit (not_reg_needs, DECL_UID (decl)); |
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2024 } |
|
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2025 |
|
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2026 else if (code == GIMPLE_CALL) |
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2027 { |
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2028 for (i = 0; i < gimple_call_num_args (stmt); ++i) |
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2029 { |
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2030 tree arg = gimple_call_arg (stmt, i); |
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2031 if ((decl = non_rewritable_mem_ref_base (arg))) |
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2032 bitmap_set_bit (not_reg_needs, DECL_UID (decl)); |
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2033 } |
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2034 } |
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2035 |
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2036 else if (code == GIMPLE_ASM) |
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2037 { |
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2038 for (i = 0; i < gimple_asm_noutputs (stmt); ++i) |
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2039 { |
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2040 tree link = gimple_asm_output_op (stmt, i); |
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2041 tree lhs = TREE_VALUE (link); |
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2042 if (TREE_CODE (lhs) != SSA_NAME) |
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2043 { |
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2044 decl = get_base_address (lhs); |
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2045 if (DECL_P (decl) |
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2046 && (non_rewritable_lvalue_p (lhs) |
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2047 /* We cannot move required conversions from |
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2048 the lhs to the rhs in asm statements, so |
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2049 require we do not need any. */ |
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2050 || !useless_type_conversion_p |
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2051 (TREE_TYPE (lhs), TREE_TYPE (decl)))) |
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2052 bitmap_set_bit (not_reg_needs, DECL_UID (decl)); |
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2053 } |
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2054 } |
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2055 for (i = 0; i < gimple_asm_ninputs (stmt); ++i) |
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2056 { |
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2057 tree link = gimple_asm_input_op (stmt, i); |
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2058 if ((decl = non_rewritable_mem_ref_base (TREE_VALUE (link)))) |
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2059 bitmap_set_bit (not_reg_needs, DECL_UID (decl)); |
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2060 } |
| 0 | 2061 } |
| 2062 } | |
| 2063 | |
| 2064 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 2065 { | |
| 2066 size_t i; | |
| 2067 gimple phi = gsi_stmt (gsi); | |
| 2068 | |
| 2069 for (i = 0; i < gimple_phi_num_args (phi); i++) | |
| 2070 { | |
| 2071 tree op = PHI_ARG_DEF (phi, i), var; | |
| 2072 if (TREE_CODE (op) == ADDR_EXPR | |
| 2073 && (var = get_base_address (TREE_OPERAND (op, 0))) != NULL | |
| 2074 && DECL_P (var)) | |
| 2075 bitmap_set_bit (addresses_taken, DECL_UID (var)); | |
| 2076 } | |
| 2077 } | |
| 2078 } | |
| 2079 | |
|
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2080 /* We cannot iterate over all referenced vars because that can contain |
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2081 unused vars from BLOCK trees, which causes code generation differences |
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2082 for -g vs. -g0. */ |
|
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2083 for (var = DECL_ARGUMENTS (cfun->decl); var; var = DECL_CHAIN (var)) |
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2084 update_vops |= maybe_optimize_var (var, addresses_taken, not_reg_needs); |
|
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2085 |
|
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2086 FOR_EACH_VEC_ELT (tree, cfun->local_decls, i, var) |
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2087 update_vops |= maybe_optimize_var (var, addresses_taken, not_reg_needs); |
| 0 | 2088 |
|
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2089 /* Operand caches need to be recomputed for operands referencing the updated |
| 0 | 2090 variables. */ |
| 2091 if (update_vops) | |
|
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2092 { |
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2093 FOR_EACH_BB (bb) |
|
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2094 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
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2095 { |
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2096 gimple stmt = gsi_stmt (gsi); |
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2097 |
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2098 /* Re-write TARGET_MEM_REFs of symbols we want to |
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2099 rewrite into SSA form. */ |
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2100 if (gimple_assign_single_p (stmt)) |
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2101 { |
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2102 tree lhs = gimple_assign_lhs (stmt); |
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2103 tree rhs, *rhsp = gimple_assign_rhs1_ptr (stmt); |
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2104 tree sym; |
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2105 |
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2106 /* We shouldn't have any fancy wrapping of |
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2107 component-refs on the LHS, but look through |
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2108 VIEW_CONVERT_EXPRs as that is easy. */ |
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2109 while (TREE_CODE (lhs) == VIEW_CONVERT_EXPR) |
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2110 lhs = TREE_OPERAND (lhs, 0); |
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2111 if (TREE_CODE (lhs) == MEM_REF |
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2112 && TREE_CODE (TREE_OPERAND (lhs, 0)) == ADDR_EXPR |
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2113 && integer_zerop (TREE_OPERAND (lhs, 1)) |
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2114 && (sym = TREE_OPERAND (TREE_OPERAND (lhs, 0), 0)) |
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2115 && DECL_P (sym) |
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2116 && !TREE_ADDRESSABLE (sym) |
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2117 && symbol_marked_for_renaming (sym)) |
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2118 lhs = sym; |
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2119 else |
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2120 lhs = gimple_assign_lhs (stmt); |
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2121 |
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2122 /* Rewrite the RHS and make sure the resulting assignment |
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2123 is validly typed. */ |
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2124 maybe_rewrite_mem_ref_base (rhsp); |
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2125 rhs = gimple_assign_rhs1 (stmt); |
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2126 if (gimple_assign_lhs (stmt) != lhs |
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2127 && !useless_type_conversion_p (TREE_TYPE (lhs), |
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2128 TREE_TYPE (rhs))) |
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2129 rhs = fold_build1 (VIEW_CONVERT_EXPR, |
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2130 TREE_TYPE (lhs), rhs); |
| 0 | 2131 |
|
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2132 if (gimple_assign_lhs (stmt) != lhs) |
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2133 gimple_assign_set_lhs (stmt, lhs); |
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2134 |
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2135 if (gimple_assign_rhs1 (stmt) != rhs) |
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2136 { |
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2137 gimple_stmt_iterator gsi = gsi_for_stmt (stmt); |
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2138 gimple_assign_set_rhs_from_tree (&gsi, rhs); |
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2139 } |
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2140 } |
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2141 |
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2142 else if (gimple_code (stmt) == GIMPLE_CALL) |
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2143 { |
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2144 unsigned i; |
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2145 for (i = 0; i < gimple_call_num_args (stmt); ++i) |
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2146 { |
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2147 tree *argp = gimple_call_arg_ptr (stmt, i); |
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2148 maybe_rewrite_mem_ref_base (argp); |
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2149 } |
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2150 } |
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2151 |
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2152 else if (gimple_code (stmt) == GIMPLE_ASM) |
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2153 { |
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2154 unsigned i; |
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2155 for (i = 0; i < gimple_asm_noutputs (stmt); ++i) |
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2156 { |
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2157 tree link = gimple_asm_output_op (stmt, i); |
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2158 maybe_rewrite_mem_ref_base (&TREE_VALUE (link)); |
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2159 } |
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2160 for (i = 0; i < gimple_asm_ninputs (stmt); ++i) |
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2161 { |
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2162 tree link = gimple_asm_input_op (stmt, i); |
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2163 maybe_rewrite_mem_ref_base (&TREE_VALUE (link)); |
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2164 } |
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2165 } |
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2166 |
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2167 if (gimple_references_memory_p (stmt) |
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2168 || is_gimple_debug (stmt)) |
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2169 update_stmt (stmt); |
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2170 } |
|
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2171 |
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2172 /* Update SSA form here, we are called as non-pass as well. */ |
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2173 update_ssa (TODO_update_ssa); |
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2174 } |
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2175 |
| 0 | 2176 BITMAP_FREE (not_reg_needs); |
| 2177 BITMAP_FREE (addresses_taken); | |
|
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2178 timevar_pop (TV_ADDRESS_TAKEN); |
| 0 | 2179 } |
| 2180 | |
| 2181 struct gimple_opt_pass pass_update_address_taken = | |
| 2182 { | |
| 2183 { | |
| 2184 GIMPLE_PASS, | |
| 2185 "addressables", /* name */ | |
| 2186 NULL, /* gate */ | |
|
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2187 NULL, /* execute */ |
| 0 | 2188 NULL, /* sub */ |
| 2189 NULL, /* next */ | |
| 2190 0, /* static_pass_number */ | |
|
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2191 TV_ADDRESS_TAKEN, /* tv_id */ |
| 0 | 2192 PROP_ssa, /* properties_required */ |
| 2193 0, /* properties_provided */ | |
| 2194 0, /* properties_destroyed */ | |
| 2195 0, /* todo_flags_start */ | |
|
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2196 TODO_update_address_taken |
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2197 | TODO_dump_func /* todo_flags_finish */ |
| 0 | 2198 } |
| 2199 }; |