Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-nrv.c @ 158:494b0b89df80 default tip
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| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 25 May 2020 18:13:55 +0900 |
| parents | 1830386684a0 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* Language independent return value optimizations |
| 145 | 2 Copyright (C) 2004-2020 Free Software Foundation, Inc. |
| 0 | 3 |
| 4 This file is part of GCC. | |
| 5 | |
| 6 GCC is free software; you can redistribute it and/or modify | |
| 7 it under the terms of the GNU General Public License as published by | |
| 8 the Free Software Foundation; either version 3, or (at your option) | |
| 9 any later version. | |
| 10 | |
| 11 GCC is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 GNU General Public License for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 #include "config.h" | |
| 21 #include "system.h" | |
| 22 #include "coretypes.h" | |
| 111 | 23 #include "backend.h" |
| 0 | 24 #include "tree.h" |
| 111 | 25 #include "gimple.h" |
| 26 #include "tree-pass.h" | |
| 27 #include "ssa.h" | |
|
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28 #include "tree-pretty-print.h" |
| 111 | 29 #include "gimple-iterator.h" |
| 30 #include "gimple-walk.h" | |
| 31 #include "internal-fn.h" | |
| 0 | 32 |
| 33 /* This file implements return value optimizations for functions which | |
| 34 return aggregate types. | |
| 35 | |
| 36 Basically this pass searches the function for return statements which | |
| 37 return a local aggregate. When converted to RTL such statements will | |
| 38 generate a copy from the local aggregate to final return value destination | |
| 39 mandated by the target's ABI. | |
| 40 | |
| 41 That copy can often be avoided by directly constructing the return value | |
| 42 into the final destination mandated by the target's ABI. | |
| 43 | |
|
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44 This is basically a generic equivalent to the C++ front-end's |
| 0 | 45 Named Return Value optimization. */ |
| 46 | |
| 111 | 47 struct nrv_data_t |
| 0 | 48 { |
| 49 /* This is the temporary (a VAR_DECL) which appears in all of | |
| 50 this function's RETURN_EXPR statements. */ | |
| 51 tree var; | |
| 52 | |
| 53 /* This is the function's RESULT_DECL. We will replace all occurrences | |
| 54 of VAR with RESULT_DECL when we apply this optimization. */ | |
| 55 tree result; | |
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56 int modified; |
| 0 | 57 }; |
| 58 | |
| 59 static tree finalize_nrv_r (tree *, int *, void *); | |
| 60 | |
| 61 /* Callback for the tree walker. | |
| 62 | |
| 63 If TP refers to a RETURN_EXPR, then set the expression being returned | |
| 64 to nrv_data->result. | |
| 65 | |
| 66 If TP refers to nrv_data->var, then replace nrv_data->var with | |
| 67 nrv_data->result. | |
| 68 | |
| 69 If we reach a node where we know all the subtrees are uninteresting, | |
| 70 then set *WALK_SUBTREES to zero. */ | |
| 71 | |
| 72 static tree | |
| 73 finalize_nrv_r (tree *tp, int *walk_subtrees, void *data) | |
| 74 { | |
| 75 struct walk_stmt_info *wi = (struct walk_stmt_info *) data; | |
| 111 | 76 struct nrv_data_t *dp = (struct nrv_data_t *) wi->info; |
| 0 | 77 |
| 78 /* No need to walk into types. */ | |
| 79 if (TYPE_P (*tp)) | |
| 80 *walk_subtrees = 0; | |
| 81 | |
| 82 /* Otherwise replace all occurrences of VAR with RESULT. */ | |
| 83 else if (*tp == dp->var) | |
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84 { |
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85 *tp = dp->result; |
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86 dp->modified = 1; |
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87 } |
| 0 | 88 |
| 89 /* Keep iterating. */ | |
| 90 return NULL_TREE; | |
| 91 } | |
| 92 | |
| 93 /* Main entry point for return value optimizations. | |
| 94 | |
| 95 If this function always returns the same local variable, and that | |
| 96 local variable is an aggregate type, then replace the variable with | |
| 97 the function's DECL_RESULT. | |
| 98 | |
| 99 This is the equivalent of the C++ named return value optimization | |
| 100 applied to optimized trees in a language independent form. If we | |
| 101 ever encounter languages which prevent this kind of optimization, | |
| 102 then we could either have the languages register the optimization or | |
| 103 we could change the gating function to check the current language. */ | |
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104 |
| 111 | 105 namespace { |
| 106 | |
| 107 const pass_data pass_data_nrv = | |
| 108 { | |
| 109 GIMPLE_PASS, /* type */ | |
| 110 "nrv", /* name */ | |
| 111 OPTGROUP_NONE, /* optinfo_flags */ | |
| 112 TV_TREE_NRV, /* tv_id */ | |
| 113 ( PROP_ssa | PROP_cfg ), /* properties_required */ | |
| 114 0, /* properties_provided */ | |
| 115 0, /* properties_destroyed */ | |
| 116 0, /* todo_flags_start */ | |
| 117 0, /* todo_flags_finish */ | |
| 118 }; | |
| 119 | |
| 120 class pass_nrv : public gimple_opt_pass | |
| 121 { | |
| 122 public: | |
| 123 pass_nrv (gcc::context *ctxt) | |
| 124 : gimple_opt_pass (pass_data_nrv, ctxt) | |
| 125 {} | |
| 126 | |
| 127 /* opt_pass methods: */ | |
| 128 virtual bool gate (function *) { return optimize > 0; } | |
| 129 | |
| 130 virtual unsigned int execute (function *); | |
| 131 | |
| 132 }; // class pass_nrv | |
| 133 | |
| 134 unsigned int | |
| 135 pass_nrv::execute (function *fun) | |
| 0 | 136 { |
| 137 tree result = DECL_RESULT (current_function_decl); | |
| 138 tree result_type = TREE_TYPE (result); | |
| 139 tree found = NULL; | |
| 140 basic_block bb; | |
| 141 gimple_stmt_iterator gsi; | |
| 111 | 142 struct nrv_data_t data; |
| 0 | 143 |
| 144 /* If this function does not return an aggregate type in memory, then | |
| 145 there is nothing to do. */ | |
| 146 if (!aggregate_value_p (result, current_function_decl)) | |
| 147 return 0; | |
| 148 | |
| 149 /* If a GIMPLE type is returned in memory, finalize_nrv_r might create | |
| 150 non-GIMPLE. */ | |
| 151 if (is_gimple_reg_type (result_type)) | |
| 152 return 0; | |
| 153 | |
| 154 /* If the front end already did something like this, don't do it here. */ | |
| 155 if (DECL_NAME (result)) | |
| 156 return 0; | |
| 157 | |
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158 /* If the result has its address taken then it might be modified |
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159 by means not detected in the following loop. Bail out in this |
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160 case. */ |
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161 if (TREE_ADDRESSABLE (result)) |
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162 return 0; |
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163 |
| 0 | 164 /* Look through each block for assignments to the RESULT_DECL. */ |
| 111 | 165 FOR_EACH_BB_FN (bb, fun) |
| 0 | 166 { |
| 167 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 168 { | |
| 111 | 169 gimple *stmt = gsi_stmt (gsi); |
| 0 | 170 tree ret_val; |
| 171 | |
| 111 | 172 if (greturn *return_stmt = dyn_cast <greturn *> (stmt)) |
| 0 | 173 { |
| 174 /* In a function with an aggregate return value, the | |
| 175 gimplifier has changed all non-empty RETURN_EXPRs to | |
| 176 return the RESULT_DECL. */ | |
| 111 | 177 ret_val = gimple_return_retval (return_stmt); |
| 0 | 178 if (ret_val) |
| 179 gcc_assert (ret_val == result); | |
| 180 } | |
| 181 else if (gimple_has_lhs (stmt) | |
| 182 && gimple_get_lhs (stmt) == result) | |
| 183 { | |
| 184 tree rhs; | |
| 185 | |
| 186 if (!gimple_assign_copy_p (stmt)) | |
| 187 return 0; | |
| 188 | |
| 189 rhs = gimple_assign_rhs1 (stmt); | |
| 190 | |
| 191 /* Now verify that this return statement uses the same value | |
| 192 as any previously encountered return statement. */ | |
| 193 if (found != NULL) | |
| 194 { | |
| 195 /* If we found a return statement using a different variable | |
| 145 | 196 than previous return statements, then we cannot perform |
| 0 | 197 NRV optimizations. */ |
| 198 if (found != rhs) | |
| 199 return 0; | |
| 200 } | |
| 201 else | |
| 202 found = rhs; | |
| 203 | |
| 204 /* The returned value must be a local automatic variable of the | |
| 205 same type and alignment as the function's result. */ | |
| 111 | 206 if (!VAR_P (found) |
| 0 | 207 || TREE_THIS_VOLATILE (found) |
| 111 | 208 || !auto_var_in_fn_p (found, current_function_decl) |
| 0 | 209 || TREE_ADDRESSABLE (found) |
| 210 || DECL_ALIGN (found) > DECL_ALIGN (result) | |
| 211 || !useless_type_conversion_p (result_type, | |
|
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212 TREE_TYPE (found))) |
| 0 | 213 return 0; |
| 214 } | |
| 215 else if (gimple_has_lhs (stmt)) | |
| 216 { | |
| 217 tree addr = get_base_address (gimple_get_lhs (stmt)); | |
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218 /* If there's any MODIFY of component of RESULT, |
| 0 | 219 then bail out. */ |
| 220 if (addr && addr == result) | |
| 221 return 0; | |
| 222 } | |
| 223 } | |
| 224 } | |
| 225 | |
| 226 if (!found) | |
| 227 return 0; | |
| 228 | |
| 229 /* If dumping details, then note once and only the NRV replacement. */ | |
| 230 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 231 { | |
| 232 fprintf (dump_file, "NRV Replaced: "); | |
| 233 print_generic_expr (dump_file, found, dump_flags); | |
| 234 fprintf (dump_file, " with: "); | |
| 235 print_generic_expr (dump_file, result, dump_flags); | |
| 236 fprintf (dump_file, "\n"); | |
| 237 } | |
| 238 | |
| 239 /* At this point we know that all the return statements return the | |
| 240 same local which has suitable attributes for NRV. Copy debugging | |
| 241 information from FOUND to RESULT if it will be useful. But don't set | |
| 242 DECL_ABSTRACT_ORIGIN to point at another function. */ | |
| 243 if (!DECL_IGNORED_P (found) | |
| 244 && !(DECL_ABSTRACT_ORIGIN (found) | |
| 245 && DECL_CONTEXT (DECL_ABSTRACT_ORIGIN (found)) != current_function_decl)) | |
| 246 { | |
| 247 DECL_NAME (result) = DECL_NAME (found); | |
| 248 DECL_SOURCE_LOCATION (result) = DECL_SOURCE_LOCATION (found); | |
| 249 DECL_ABSTRACT_ORIGIN (result) = DECL_ABSTRACT_ORIGIN (found); | |
| 250 } | |
| 251 | |
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252 TREE_ADDRESSABLE (result) |= TREE_ADDRESSABLE (found); |
| 0 | 253 |
| 254 /* Now walk through the function changing all references to VAR to be | |
| 255 RESULT. */ | |
| 256 data.var = found; | |
| 257 data.result = result; | |
| 111 | 258 FOR_EACH_BB_FN (bb, fun) |
| 0 | 259 { |
| 260 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); ) | |
| 261 { | |
| 111 | 262 gimple *stmt = gsi_stmt (gsi); |
| 0 | 263 /* If this is a copy from VAR to RESULT, remove it. */ |
| 264 if (gimple_assign_copy_p (stmt) | |
| 265 && gimple_assign_lhs (stmt) == result | |
| 266 && gimple_assign_rhs1 (stmt) == found) | |
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267 { |
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268 unlink_stmt_vdef (stmt); |
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269 gsi_remove (&gsi, true); |
| 111 | 270 release_defs (stmt); |
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271 } |
| 0 | 272 else |
| 273 { | |
| 274 struct walk_stmt_info wi; | |
| 275 memset (&wi, 0, sizeof (wi)); | |
| 276 wi.info = &data; | |
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277 data.modified = 0; |
| 0 | 278 walk_gimple_op (stmt, finalize_nrv_r, &wi); |
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279 if (data.modified) |
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280 update_stmt (stmt); |
| 0 | 281 gsi_next (&gsi); |
| 282 } | |
| 283 } | |
| 284 } | |
| 285 | |
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286 SET_DECL_VALUE_EXPR (found, result); |
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287 DECL_HAS_VALUE_EXPR_P (found) = 1; |
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288 |
| 0 | 289 return 0; |
| 290 } | |
| 291 | |
| 111 | 292 } // anon namespace |
| 0 | 293 |
| 111 | 294 gimple_opt_pass * |
| 295 make_pass_nrv (gcc::context *ctxt) | |
| 0 | 296 { |
| 111 | 297 return new pass_nrv (ctxt); |
| 298 } | |
| 0 | 299 |
| 300 /* Determine (pessimistically) whether DEST is available for NRV | |
| 301 optimization, where DEST is expected to be the LHS of a modify | |
| 302 expression where the RHS is a function returning an aggregate. | |
| 303 | |
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304 DEST is available if it is not clobbered or used by the call. */ |
| 0 | 305 |
| 306 static bool | |
| 111 | 307 dest_safe_for_nrv_p (gcall *call) |
| 0 | 308 { |
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309 tree dest = gimple_call_lhs (call); |
| 0 | 310 |
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311 dest = get_base_address (dest); |
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312 if (! dest) |
| 0 | 313 return false; |
| 314 | |
| 315 if (TREE_CODE (dest) == SSA_NAME) | |
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316 return true; |
| 0 | 317 |
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318 if (call_may_clobber_ref_p (call, dest) |
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319 || ref_maybe_used_by_stmt_p (call, dest)) |
| 0 | 320 return false; |
| 321 | |
| 322 return true; | |
| 323 } | |
| 324 | |
| 325 /* Walk through the function looking for GIMPLE_ASSIGNs with calls that | |
| 326 return in memory on the RHS. For each of these, determine whether it is | |
| 327 safe to pass the address of the LHS as the return slot, and mark the | |
| 328 call appropriately if so. | |
| 329 | |
| 330 The NRV shares the return slot with a local variable in the callee; this | |
| 331 optimization shares the return slot with the target of the call within | |
| 332 the caller. If the NRV is performed (which we can't know in general), | |
| 333 this optimization is safe if the address of the target has not | |
| 334 escaped prior to the call. If it has, modifications to the local | |
| 335 variable will produce visible changes elsewhere, as in PR c++/19317. */ | |
| 336 | |
| 111 | 337 namespace { |
| 338 | |
| 339 const pass_data pass_data_return_slot = | |
| 340 { | |
| 341 GIMPLE_PASS, /* type */ | |
| 342 "retslot", /* name */ | |
| 343 OPTGROUP_NONE, /* optinfo_flags */ | |
| 344 TV_NONE, /* tv_id */ | |
| 345 PROP_ssa, /* properties_required */ | |
| 346 0, /* properties_provided */ | |
| 347 0, /* properties_destroyed */ | |
| 348 0, /* todo_flags_start */ | |
| 349 0, /* todo_flags_finish */ | |
| 350 }; | |
| 351 | |
| 352 class pass_return_slot : public gimple_opt_pass | |
| 353 { | |
| 354 public: | |
| 355 pass_return_slot (gcc::context *ctxt) | |
| 356 : gimple_opt_pass (pass_data_return_slot, ctxt) | |
| 357 {} | |
| 358 | |
| 359 /* opt_pass methods: */ | |
| 360 virtual unsigned int execute (function *); | |
| 361 | |
| 362 }; // class pass_return_slot | |
| 363 | |
| 364 unsigned int | |
| 365 pass_return_slot::execute (function *fun) | |
| 0 | 366 { |
| 367 basic_block bb; | |
| 368 | |
| 111 | 369 FOR_EACH_BB_FN (bb, fun) |
| 0 | 370 { |
| 371 gimple_stmt_iterator gsi; | |
| 372 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 373 { | |
| 111 | 374 gcall *stmt; |
| 0 | 375 bool slot_opt_p; |
| 376 | |
| 111 | 377 stmt = dyn_cast <gcall *> (gsi_stmt (gsi)); |
| 378 if (stmt | |
| 0 | 379 && gimple_call_lhs (stmt) |
| 380 && !gimple_call_return_slot_opt_p (stmt) | |
| 145 | 381 /* Ignore internal functions, those are expanded specially |
| 382 and aggregate_value_p on their result might result in | |
| 383 undesirable warnings with some backends. */ | |
| 384 && !gimple_call_internal_p (stmt) | |
| 0 | 385 && aggregate_value_p (TREE_TYPE (gimple_call_lhs (stmt)), |
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386 gimple_call_fndecl (stmt))) |
| 0 | 387 { |
| 388 /* Check if the location being assigned to is | |
| 111 | 389 clobbered by the call. */ |
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390 slot_opt_p = dest_safe_for_nrv_p (stmt); |
| 0 | 391 gimple_call_set_return_slot_opt (stmt, slot_opt_p); |
| 392 } | |
| 393 } | |
| 394 } | |
| 395 return 0; | |
| 396 } | |
| 397 | |
| 111 | 398 } // anon namespace |
| 399 | |
| 400 gimple_opt_pass * | |
| 401 make_pass_return_slot (gcc::context *ctxt) | |
| 0 | 402 { |
| 111 | 403 return new pass_return_slot (ctxt); |
| 404 } |