Mercurial > hg > CbC > CbC_gcc
annotate gcc/gimple-low.c @ 108:7ad14f446135
add CbC-example/rectypeTest/
author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
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date | Thu, 14 Jun 2012 20:30:24 +0900 |
parents | f6334be47118 |
children | 04ced10e8804 |
rev | line source |
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0 | 1 /* GIMPLE lowering pass. Converts High GIMPLE into Low GIMPLE. |
2 | |
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3 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
0 | 4 Free Software Foundation, Inc. |
5 | |
6 This file is part of GCC. | |
7 | |
8 GCC is free software; you can redistribute it and/or modify it under | |
9 the terms of the GNU General Public License as published by the Free | |
10 Software Foundation; either version 3, or (at your option) any later | |
11 version. | |
12 | |
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 for more details. | |
17 | |
18 You should have received a copy of the GNU General Public License | |
19 along with GCC; see the file COPYING3. If not see | |
20 <http://www.gnu.org/licenses/>. */ | |
21 | |
22 #include "config.h" | |
23 #include "system.h" | |
24 #include "coretypes.h" | |
25 #include "tm.h" | |
26 #include "tree.h" | |
27 #include "gimple.h" | |
28 #include "tree-iterator.h" | |
29 #include "tree-inline.h" | |
30 #include "tree-flow.h" | |
31 #include "flags.h" | |
32 #include "function.h" | |
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33 #include "diagnostic-core.h" |
0 | 34 #include "tree-pass.h" |
35 | |
36 /* The differences between High GIMPLE and Low GIMPLE are the | |
37 following: | |
38 | |
39 1- Lexical scopes are removed (i.e., GIMPLE_BIND disappears). | |
40 | |
41 2- GIMPLE_TRY and GIMPLE_CATCH are converted to abnormal control | |
42 flow and exception regions are built as an on-the-side region | |
43 hierarchy (See tree-eh.c:lower_eh_constructs). | |
44 | |
45 3- Multiple identical return statements are grouped into a single | |
46 return and gotos to the unique return site. */ | |
47 | |
48 /* Match a return statement with a label. During lowering, we identify | |
49 identical return statements and replace duplicates with a jump to | |
50 the corresponding label. */ | |
51 struct return_statements_t | |
52 { | |
53 tree label; | |
54 gimple stmt; | |
55 }; | |
56 typedef struct return_statements_t return_statements_t; | |
57 | |
58 DEF_VEC_O(return_statements_t); | |
59 DEF_VEC_ALLOC_O(return_statements_t,heap); | |
60 | |
61 struct lower_data | |
62 { | |
63 /* Block the current statement belongs to. */ | |
64 tree block; | |
65 | |
66 /* A vector of label and return statements to be moved to the end | |
67 of the function. */ | |
68 VEC(return_statements_t,heap) *return_statements; | |
69 | |
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70 /* True if the current statement cannot fall through. */ |
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71 bool cannot_fallthru; |
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72 |
0 | 73 /* True if the function calls __builtin_setjmp. */ |
74 bool calls_builtin_setjmp; | |
75 }; | |
76 | |
77 static void lower_stmt (gimple_stmt_iterator *, struct lower_data *); | |
78 static void lower_gimple_bind (gimple_stmt_iterator *, struct lower_data *); | |
79 static void lower_gimple_return (gimple_stmt_iterator *, struct lower_data *); | |
80 static void lower_builtin_setjmp (gimple_stmt_iterator *); | |
81 | |
82 | |
83 /* Lower the body of current_function_decl from High GIMPLE into Low | |
84 GIMPLE. */ | |
85 | |
86 static unsigned int | |
87 lower_function_body (void) | |
88 { | |
89 struct lower_data data; | |
90 gimple_seq body = gimple_body (current_function_decl); | |
91 gimple_seq lowered_body; | |
92 gimple_stmt_iterator i; | |
93 gimple bind; | |
94 tree t; | |
95 gimple x; | |
96 | |
97 /* The gimplifier should've left a body of exactly one statement, | |
98 namely a GIMPLE_BIND. */ | |
99 gcc_assert (gimple_seq_first (body) == gimple_seq_last (body) | |
100 && gimple_code (gimple_seq_first_stmt (body)) == GIMPLE_BIND); | |
101 | |
102 memset (&data, 0, sizeof (data)); | |
103 data.block = DECL_INITIAL (current_function_decl); | |
104 BLOCK_SUBBLOCKS (data.block) = NULL_TREE; | |
105 BLOCK_CHAIN (data.block) = NULL_TREE; | |
106 TREE_ASM_WRITTEN (data.block) = 1; | |
107 data.return_statements = VEC_alloc (return_statements_t, heap, 8); | |
108 | |
109 bind = gimple_seq_first_stmt (body); | |
110 lowered_body = NULL; | |
111 gimple_seq_add_stmt (&lowered_body, bind); | |
112 i = gsi_start (lowered_body); | |
113 lower_gimple_bind (&i, &data); | |
114 | |
115 /* Once the old body has been lowered, replace it with the new | |
116 lowered sequence. */ | |
117 gimple_set_body (current_function_decl, lowered_body); | |
118 | |
119 i = gsi_last (lowered_body); | |
120 | |
121 /* If the function falls off the end, we need a null return statement. | |
122 If we've already got one in the return_statements vector, we don't | |
123 need to do anything special. Otherwise build one by hand. */ | |
124 if (gimple_seq_may_fallthru (lowered_body) | |
125 && (VEC_empty (return_statements_t, data.return_statements) | |
126 || gimple_return_retval (VEC_last (return_statements_t, | |
127 data.return_statements)->stmt) != NULL)) | |
128 { | |
129 x = gimple_build_return (NULL); | |
130 gimple_set_location (x, cfun->function_end_locus); | |
131 gimple_set_block (x, DECL_INITIAL (current_function_decl)); | |
132 gsi_insert_after (&i, x, GSI_CONTINUE_LINKING); | |
133 } | |
134 | |
135 /* If we lowered any return statements, emit the representative | |
136 at the end of the function. */ | |
137 while (!VEC_empty (return_statements_t, data.return_statements)) | |
138 { | |
139 return_statements_t t; | |
140 | |
141 /* Unfortunately, we can't use VEC_pop because it returns void for | |
142 objects. */ | |
143 t = *VEC_last (return_statements_t, data.return_statements); | |
144 VEC_truncate (return_statements_t, | |
145 data.return_statements, | |
146 VEC_length (return_statements_t, | |
147 data.return_statements) - 1); | |
148 | |
149 x = gimple_build_label (t.label); | |
150 gsi_insert_after (&i, x, GSI_CONTINUE_LINKING); | |
151 gsi_insert_after (&i, t.stmt, GSI_CONTINUE_LINKING); | |
152 } | |
153 | |
154 /* If the function calls __builtin_setjmp, we need to emit the computed | |
155 goto that will serve as the unique dispatcher for all the receivers. */ | |
156 if (data.calls_builtin_setjmp) | |
157 { | |
158 tree disp_label, disp_var, arg; | |
159 | |
160 /* Build 'DISP_LABEL:' and insert. */ | |
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161 disp_label = create_artificial_label (cfun->function_end_locus); |
0 | 162 /* This mark will create forward edges from every call site. */ |
163 DECL_NONLOCAL (disp_label) = 1; | |
164 cfun->has_nonlocal_label = 1; | |
165 x = gimple_build_label (disp_label); | |
166 gsi_insert_after (&i, x, GSI_CONTINUE_LINKING); | |
167 | |
168 /* Build 'DISP_VAR = __builtin_setjmp_dispatcher (DISP_LABEL);' | |
169 and insert. */ | |
170 disp_var = create_tmp_var (ptr_type_node, "setjmpvar"); | |
171 arg = build_addr (disp_label, current_function_decl); | |
172 t = implicit_built_in_decls[BUILT_IN_SETJMP_DISPATCHER]; | |
173 x = gimple_build_call (t, 1, arg); | |
174 gimple_call_set_lhs (x, disp_var); | |
175 | |
176 /* Build 'goto DISP_VAR;' and insert. */ | |
177 gsi_insert_after (&i, x, GSI_CONTINUE_LINKING); | |
178 x = gimple_build_goto (disp_var); | |
179 gsi_insert_after (&i, x, GSI_CONTINUE_LINKING); | |
180 } | |
181 | |
182 gcc_assert (data.block == DECL_INITIAL (current_function_decl)); | |
183 BLOCK_SUBBLOCKS (data.block) | |
184 = blocks_nreverse (BLOCK_SUBBLOCKS (data.block)); | |
185 | |
186 clear_block_marks (data.block); | |
187 VEC_free(return_statements_t, heap, data.return_statements); | |
188 return 0; | |
189 } | |
190 | |
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191 struct gimple_opt_pass pass_lower_cf = |
0 | 192 { |
193 { | |
194 GIMPLE_PASS, | |
195 "lower", /* name */ | |
196 NULL, /* gate */ | |
197 lower_function_body, /* execute */ | |
198 NULL, /* sub */ | |
199 NULL, /* next */ | |
200 0, /* static_pass_number */ | |
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201 TV_NONE, /* tv_id */ |
0 | 202 PROP_gimple_any, /* properties_required */ |
203 PROP_gimple_lcf, /* properties_provided */ | |
204 0, /* properties_destroyed */ | |
205 0, /* todo_flags_start */ | |
206 TODO_dump_func /* todo_flags_finish */ | |
207 } | |
208 }; | |
209 | |
210 | |
211 /* Verify if the type of the argument matches that of the function | |
212 declaration. If we cannot verify this or there is a mismatch, | |
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213 return false. */ |
0 | 214 |
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215 bool |
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216 gimple_check_call_args (gimple stmt) |
0 | 217 { |
218 tree fndecl, parms, p; | |
219 unsigned int i, nargs; | |
220 | |
221 nargs = gimple_call_num_args (stmt); | |
222 | |
223 /* Get argument types for verification. */ | |
224 fndecl = gimple_call_fndecl (stmt); | |
225 parms = NULL_TREE; | |
226 if (fndecl) | |
227 parms = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); | |
228 else if (POINTER_TYPE_P (TREE_TYPE (gimple_call_fn (stmt)))) | |
229 parms = TYPE_ARG_TYPES (TREE_TYPE (TREE_TYPE (gimple_call_fn (stmt)))); | |
230 | |
231 /* Verify if the type of the argument matches that of the function | |
232 declaration. If we cannot verify this or there is a mismatch, | |
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233 return false. */ |
0 | 234 if (fndecl && DECL_ARGUMENTS (fndecl)) |
235 { | |
236 for (i = 0, p = DECL_ARGUMENTS (fndecl); | |
237 i < nargs; | |
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238 i++, p = DECL_CHAIN (p)) |
0 | 239 { |
240 /* We cannot distinguish a varargs function from the case | |
241 of excess parameters, still deferring the inlining decision | |
242 to the callee is possible. */ | |
243 if (!p) | |
244 break; | |
245 if (p == error_mark_node | |
246 || gimple_call_arg (stmt, i) == error_mark_node | |
247 || !fold_convertible_p (DECL_ARG_TYPE (p), | |
248 gimple_call_arg (stmt, i))) | |
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249 return false; |
0 | 250 } |
251 } | |
252 else if (parms) | |
253 { | |
254 for (i = 0, p = parms; i < nargs; i++, p = TREE_CHAIN (p)) | |
255 { | |
256 /* If this is a varargs function defer inlining decision | |
257 to callee. */ | |
258 if (!p) | |
259 break; | |
260 if (TREE_VALUE (p) == error_mark_node | |
261 || gimple_call_arg (stmt, i) == error_mark_node | |
262 || TREE_CODE (TREE_VALUE (p)) == VOID_TYPE | |
263 || !fold_convertible_p (TREE_VALUE (p), | |
264 gimple_call_arg (stmt, i))) | |
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265 return false; |
0 | 266 } |
267 } | |
268 else | |
269 { | |
270 if (nargs != 0) | |
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271 return false; |
0 | 272 } |
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273 return true; |
0 | 274 } |
275 | |
276 | |
277 /* Lower sequence SEQ. Unlike gimplification the statements are not relowered | |
278 when they are changed -- if this has to be done, the lowering routine must | |
279 do it explicitly. DATA is passed through the recursion. */ | |
280 | |
281 static void | |
282 lower_sequence (gimple_seq seq, struct lower_data *data) | |
283 { | |
284 gimple_stmt_iterator gsi; | |
285 | |
286 for (gsi = gsi_start (seq); !gsi_end_p (gsi); ) | |
287 lower_stmt (&gsi, data); | |
288 } | |
289 | |
290 | |
291 /* Lower the OpenMP directive statement pointed by GSI. DATA is | |
292 passed through the recursion. */ | |
293 | |
294 static void | |
295 lower_omp_directive (gimple_stmt_iterator *gsi, struct lower_data *data) | |
296 { | |
297 gimple stmt; | |
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298 |
0 | 299 stmt = gsi_stmt (*gsi); |
300 | |
301 lower_sequence (gimple_omp_body (stmt), data); | |
302 gsi_insert_before (gsi, stmt, GSI_SAME_STMT); | |
303 gsi_insert_seq_before (gsi, gimple_omp_body (stmt), GSI_SAME_STMT); | |
304 gimple_omp_set_body (stmt, NULL); | |
305 gsi_remove (gsi, false); | |
306 } | |
307 | |
308 | |
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309 /* Lower statement GSI. DATA is passed through the recursion. We try to |
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310 track the fallthruness of statements and get rid of unreachable return |
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311 statements in order to prevent the EH lowering pass from adding useless |
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312 edges that can cause bogus warnings to be issued later; this guess need |
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313 not be 100% accurate, simply be conservative and reset cannot_fallthru |
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314 to false if we don't know. */ |
0 | 315 |
316 static void | |
317 lower_stmt (gimple_stmt_iterator *gsi, struct lower_data *data) | |
318 { | |
319 gimple stmt = gsi_stmt (*gsi); | |
320 | |
321 gimple_set_block (stmt, data->block); | |
322 | |
323 switch (gimple_code (stmt)) | |
324 { | |
325 case GIMPLE_BIND: | |
326 lower_gimple_bind (gsi, data); | |
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327 /* Propagate fallthruness. */ |
0 | 328 return; |
329 | |
330 case GIMPLE_COND: | |
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331 case GIMPLE_GOTO: |
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332 case GIMPLE_SWITCH: |
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333 data->cannot_fallthru = true; |
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334 gsi_next (gsi); |
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335 return; |
0 | 336 |
337 case GIMPLE_RETURN: | |
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338 if (data->cannot_fallthru) |
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339 { |
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340 gsi_remove (gsi, false); |
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341 /* Propagate fallthruness. */ |
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342 } |
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343 else |
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344 { |
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345 lower_gimple_return (gsi, data); |
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346 data->cannot_fallthru = true; |
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347 } |
0 | 348 return; |
349 | |
350 case GIMPLE_TRY: | |
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351 { |
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352 bool try_cannot_fallthru; |
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353 lower_sequence (gimple_try_eval (stmt), data); |
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354 try_cannot_fallthru = data->cannot_fallthru; |
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355 data->cannot_fallthru = false; |
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356 lower_sequence (gimple_try_cleanup (stmt), data); |
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357 /* See gimple_stmt_may_fallthru for the rationale. */ |
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358 if (gimple_try_kind (stmt) == GIMPLE_TRY_FINALLY) |
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359 { |
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360 data->cannot_fallthru |= try_cannot_fallthru; |
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361 gsi_next (gsi); |
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362 return; |
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363 } |
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364 } |
0 | 365 break; |
366 | |
367 case GIMPLE_CATCH: | |
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368 data->cannot_fallthru = false; |
0 | 369 lower_sequence (gimple_catch_handler (stmt), data); |
370 break; | |
371 | |
372 case GIMPLE_EH_FILTER: | |
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373 data->cannot_fallthru = false; |
0 | 374 lower_sequence (gimple_eh_filter_failure (stmt), data); |
375 break; | |
376 | |
377 case GIMPLE_NOP: | |
378 case GIMPLE_ASM: | |
379 case GIMPLE_ASSIGN: | |
380 case GIMPLE_PREDICT: | |
381 case GIMPLE_LABEL: | |
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382 case GIMPLE_EH_MUST_NOT_THROW: |
0 | 383 case GIMPLE_OMP_FOR: |
384 case GIMPLE_OMP_SECTIONS: | |
385 case GIMPLE_OMP_SECTIONS_SWITCH: | |
386 case GIMPLE_OMP_SECTION: | |
387 case GIMPLE_OMP_SINGLE: | |
388 case GIMPLE_OMP_MASTER: | |
389 case GIMPLE_OMP_ORDERED: | |
390 case GIMPLE_OMP_CRITICAL: | |
391 case GIMPLE_OMP_RETURN: | |
392 case GIMPLE_OMP_ATOMIC_LOAD: | |
393 case GIMPLE_OMP_ATOMIC_STORE: | |
394 case GIMPLE_OMP_CONTINUE: | |
395 break; | |
396 | |
397 case GIMPLE_CALL: | |
398 { | |
399 tree decl = gimple_call_fndecl (stmt); | |
400 | |
401 if (decl | |
402 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL | |
403 && DECL_FUNCTION_CODE (decl) == BUILT_IN_SETJMP) | |
404 { | |
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405 lower_builtin_setjmp (gsi); |
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406 data->cannot_fallthru = false; |
0 | 407 data->calls_builtin_setjmp = true; |
408 return; | |
409 } | |
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410 |
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411 if (decl && (flags_from_decl_or_type (decl) & ECF_NORETURN)) |
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412 { |
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413 data->cannot_fallthru = true; |
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414 gsi_next (gsi); |
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415 return; |
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416 } |
0 | 417 } |
418 break; | |
419 | |
420 case GIMPLE_OMP_PARALLEL: | |
421 case GIMPLE_OMP_TASK: | |
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422 data->cannot_fallthru = false; |
0 | 423 lower_omp_directive (gsi, data); |
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424 data->cannot_fallthru = false; |
0 | 425 return; |
426 | |
427 default: | |
428 gcc_unreachable (); | |
429 } | |
430 | |
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431 data->cannot_fallthru = false; |
0 | 432 gsi_next (gsi); |
433 } | |
434 | |
435 /* Lower a bind_expr TSI. DATA is passed through the recursion. */ | |
436 | |
437 static void | |
438 lower_gimple_bind (gimple_stmt_iterator *gsi, struct lower_data *data) | |
439 { | |
440 tree old_block = data->block; | |
441 gimple stmt = gsi_stmt (*gsi); | |
442 tree new_block = gimple_bind_block (stmt); | |
443 | |
444 if (new_block) | |
445 { | |
446 if (new_block == old_block) | |
447 { | |
448 /* The outermost block of the original function may not be the | |
449 outermost statement chain of the gimplified function. So we | |
450 may see the outermost block just inside the function. */ | |
451 gcc_assert (new_block == DECL_INITIAL (current_function_decl)); | |
452 new_block = NULL; | |
453 } | |
454 else | |
455 { | |
456 /* We do not expect to handle duplicate blocks. */ | |
457 gcc_assert (!TREE_ASM_WRITTEN (new_block)); | |
458 TREE_ASM_WRITTEN (new_block) = 1; | |
459 | |
460 /* Block tree may get clobbered by inlining. Normally this would | |
461 be fixed in rest_of_decl_compilation using block notes, but | |
462 since we are not going to emit them, it is up to us. */ | |
463 BLOCK_CHAIN (new_block) = BLOCK_SUBBLOCKS (old_block); | |
464 BLOCK_SUBBLOCKS (old_block) = new_block; | |
465 BLOCK_SUBBLOCKS (new_block) = NULL_TREE; | |
466 BLOCK_SUPERCONTEXT (new_block) = old_block; | |
467 | |
468 data->block = new_block; | |
469 } | |
470 } | |
471 | |
472 record_vars (gimple_bind_vars (stmt)); | |
473 lower_sequence (gimple_bind_body (stmt), data); | |
474 | |
475 if (new_block) | |
476 { | |
477 gcc_assert (data->block == new_block); | |
478 | |
479 BLOCK_SUBBLOCKS (new_block) | |
480 = blocks_nreverse (BLOCK_SUBBLOCKS (new_block)); | |
481 data->block = old_block; | |
482 } | |
483 | |
484 /* The GIMPLE_BIND no longer carries any useful information -- kill it. */ | |
485 gsi_insert_seq_before (gsi, gimple_bind_body (stmt), GSI_SAME_STMT); | |
486 gsi_remove (gsi, false); | |
487 } | |
488 | |
489 /* Try to determine whether a TRY_CATCH expression can fall through. | |
490 This is a subroutine of block_may_fallthru. */ | |
491 | |
492 static bool | |
493 try_catch_may_fallthru (const_tree stmt) | |
494 { | |
495 tree_stmt_iterator i; | |
496 | |
497 /* If the TRY block can fall through, the whole TRY_CATCH can | |
498 fall through. */ | |
499 if (block_may_fallthru (TREE_OPERAND (stmt, 0))) | |
500 return true; | |
501 | |
502 i = tsi_start (TREE_OPERAND (stmt, 1)); | |
503 switch (TREE_CODE (tsi_stmt (i))) | |
504 { | |
505 case CATCH_EXPR: | |
506 /* We expect to see a sequence of CATCH_EXPR trees, each with a | |
507 catch expression and a body. The whole TRY_CATCH may fall | |
508 through iff any of the catch bodies falls through. */ | |
509 for (; !tsi_end_p (i); tsi_next (&i)) | |
510 { | |
511 if (block_may_fallthru (CATCH_BODY (tsi_stmt (i)))) | |
512 return true; | |
513 } | |
514 return false; | |
515 | |
516 case EH_FILTER_EXPR: | |
517 /* The exception filter expression only matters if there is an | |
518 exception. If the exception does not match EH_FILTER_TYPES, | |
519 we will execute EH_FILTER_FAILURE, and we will fall through | |
520 if that falls through. If the exception does match | |
521 EH_FILTER_TYPES, the stack unwinder will continue up the | |
522 stack, so we will not fall through. We don't know whether we | |
523 will throw an exception which matches EH_FILTER_TYPES or not, | |
524 so we just ignore EH_FILTER_TYPES and assume that we might | |
525 throw an exception which doesn't match. */ | |
526 return block_may_fallthru (EH_FILTER_FAILURE (tsi_stmt (i))); | |
527 | |
528 default: | |
529 /* This case represents statements to be executed when an | |
530 exception occurs. Those statements are implicitly followed | |
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531 by a RESX statement to resume execution after the exception. |
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532 So in this case the TRY_CATCH never falls through. */ |
0 | 533 return false; |
534 } | |
535 } | |
536 | |
537 | |
538 /* Same as above, but for a GIMPLE_TRY_CATCH. */ | |
539 | |
540 static bool | |
541 gimple_try_catch_may_fallthru (gimple stmt) | |
542 { | |
543 gimple_stmt_iterator i; | |
544 | |
545 /* We don't handle GIMPLE_TRY_FINALLY. */ | |
546 gcc_assert (gimple_try_kind (stmt) == GIMPLE_TRY_CATCH); | |
547 | |
548 /* If the TRY block can fall through, the whole TRY_CATCH can | |
549 fall through. */ | |
550 if (gimple_seq_may_fallthru (gimple_try_eval (stmt))) | |
551 return true; | |
552 | |
553 i = gsi_start (gimple_try_cleanup (stmt)); | |
554 switch (gimple_code (gsi_stmt (i))) | |
555 { | |
556 case GIMPLE_CATCH: | |
557 /* We expect to see a sequence of GIMPLE_CATCH stmts, each with a | |
558 catch expression and a body. The whole try/catch may fall | |
559 through iff any of the catch bodies falls through. */ | |
560 for (; !gsi_end_p (i); gsi_next (&i)) | |
561 { | |
562 if (gimple_seq_may_fallthru (gimple_catch_handler (gsi_stmt (i)))) | |
563 return true; | |
564 } | |
565 return false; | |
566 | |
567 case GIMPLE_EH_FILTER: | |
568 /* The exception filter expression only matters if there is an | |
569 exception. If the exception does not match EH_FILTER_TYPES, | |
570 we will execute EH_FILTER_FAILURE, and we will fall through | |
571 if that falls through. If the exception does match | |
572 EH_FILTER_TYPES, the stack unwinder will continue up the | |
573 stack, so we will not fall through. We don't know whether we | |
574 will throw an exception which matches EH_FILTER_TYPES or not, | |
575 so we just ignore EH_FILTER_TYPES and assume that we might | |
576 throw an exception which doesn't match. */ | |
577 return gimple_seq_may_fallthru (gimple_eh_filter_failure (gsi_stmt (i))); | |
578 | |
579 default: | |
580 /* This case represents statements to be executed when an | |
581 exception occurs. Those statements are implicitly followed | |
582 by a GIMPLE_RESX to resume execution after the exception. So | |
583 in this case the try/catch never falls through. */ | |
584 return false; | |
585 } | |
586 } | |
587 | |
588 | |
589 /* Try to determine if we can fall out of the bottom of BLOCK. This guess | |
590 need not be 100% accurate; simply be conservative and return true if we | |
591 don't know. This is used only to avoid stupidly generating extra code. | |
592 If we're wrong, we'll just delete the extra code later. */ | |
593 | |
594 bool | |
595 block_may_fallthru (const_tree block) | |
596 { | |
597 /* This CONST_CAST is okay because expr_last returns its argument | |
598 unmodified and we assign it to a const_tree. */ | |
599 const_tree stmt = expr_last (CONST_CAST_TREE(block)); | |
600 | |
601 switch (stmt ? TREE_CODE (stmt) : ERROR_MARK) | |
602 { | |
603 case GOTO_EXPR: | |
604 case RETURN_EXPR: | |
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605 /* Easy cases. If the last statement of the block implies |
0 | 606 control transfer, then we can't fall through. */ |
607 return false; | |
608 | |
609 case SWITCH_EXPR: | |
610 /* If SWITCH_LABELS is set, this is lowered, and represents a | |
611 branch to a selected label and hence can not fall through. | |
612 Otherwise SWITCH_BODY is set, and the switch can fall | |
613 through. */ | |
614 return SWITCH_LABELS (stmt) == NULL_TREE; | |
615 | |
616 case COND_EXPR: | |
617 if (block_may_fallthru (COND_EXPR_THEN (stmt))) | |
618 return true; | |
619 return block_may_fallthru (COND_EXPR_ELSE (stmt)); | |
620 | |
621 case BIND_EXPR: | |
622 return block_may_fallthru (BIND_EXPR_BODY (stmt)); | |
623 | |
624 case TRY_CATCH_EXPR: | |
625 return try_catch_may_fallthru (stmt); | |
626 | |
627 case TRY_FINALLY_EXPR: | |
628 /* The finally clause is always executed after the try clause, | |
629 so if it does not fall through, then the try-finally will not | |
630 fall through. Otherwise, if the try clause does not fall | |
631 through, then when the finally clause falls through it will | |
632 resume execution wherever the try clause was going. So the | |
633 whole try-finally will only fall through if both the try | |
634 clause and the finally clause fall through. */ | |
635 return (block_may_fallthru (TREE_OPERAND (stmt, 0)) | |
636 && block_may_fallthru (TREE_OPERAND (stmt, 1))); | |
637 | |
638 case MODIFY_EXPR: | |
639 if (TREE_CODE (TREE_OPERAND (stmt, 1)) == CALL_EXPR) | |
640 stmt = TREE_OPERAND (stmt, 1); | |
641 else | |
642 return true; | |
643 /* FALLTHRU */ | |
644 | |
645 case CALL_EXPR: | |
646 /* Functions that do not return do not fall through. */ | |
647 return (call_expr_flags (stmt) & ECF_NORETURN) == 0; | |
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648 |
0 | 649 case CLEANUP_POINT_EXPR: |
650 return block_may_fallthru (TREE_OPERAND (stmt, 0)); | |
651 | |
652 default: | |
653 return true; | |
654 } | |
655 } | |
656 | |
657 | |
658 /* Try to determine if we can continue executing the statement | |
659 immediately following STMT. This guess need not be 100% accurate; | |
660 simply be conservative and return true if we don't know. This is | |
661 used only to avoid stupidly generating extra code. If we're wrong, | |
662 we'll just delete the extra code later. */ | |
663 | |
664 bool | |
665 gimple_stmt_may_fallthru (gimple stmt) | |
666 { | |
667 if (!stmt) | |
668 return true; | |
669 | |
670 switch (gimple_code (stmt)) | |
671 { | |
672 case GIMPLE_GOTO: | |
673 case GIMPLE_RETURN: | |
674 case GIMPLE_RESX: | |
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675 /* Easy cases. If the last statement of the seq implies |
0 | 676 control transfer, then we can't fall through. */ |
677 return false; | |
678 | |
679 case GIMPLE_SWITCH: | |
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680 /* Switch has already been lowered and represents a branch |
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681 to a selected label and hence can't fall through. */ |
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682 return false; |
0 | 683 |
684 case GIMPLE_COND: | |
685 /* GIMPLE_COND's are already lowered into a two-way branch. They | |
686 can't fall through. */ | |
687 return false; | |
688 | |
689 case GIMPLE_BIND: | |
690 return gimple_seq_may_fallthru (gimple_bind_body (stmt)); | |
691 | |
692 case GIMPLE_TRY: | |
693 if (gimple_try_kind (stmt) == GIMPLE_TRY_CATCH) | |
694 return gimple_try_catch_may_fallthru (stmt); | |
695 | |
696 /* It must be a GIMPLE_TRY_FINALLY. */ | |
697 | |
698 /* The finally clause is always executed after the try clause, | |
699 so if it does not fall through, then the try-finally will not | |
700 fall through. Otherwise, if the try clause does not fall | |
701 through, then when the finally clause falls through it will | |
702 resume execution wherever the try clause was going. So the | |
703 whole try-finally will only fall through if both the try | |
704 clause and the finally clause fall through. */ | |
705 return (gimple_seq_may_fallthru (gimple_try_eval (stmt)) | |
706 && gimple_seq_may_fallthru (gimple_try_cleanup (stmt))); | |
707 | |
708 case GIMPLE_CALL: | |
709 /* Functions that do not return do not fall through. */ | |
710 return (gimple_call_flags (stmt) & ECF_NORETURN) == 0; | |
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711 |
0 | 712 default: |
713 return true; | |
714 } | |
715 } | |
716 | |
717 | |
718 /* Same as gimple_stmt_may_fallthru, but for the gimple sequence SEQ. */ | |
719 | |
720 bool | |
721 gimple_seq_may_fallthru (gimple_seq seq) | |
722 { | |
723 return gimple_stmt_may_fallthru (gimple_seq_last_stmt (seq)); | |
724 } | |
725 | |
726 | |
727 /* Lower a GIMPLE_RETURN GSI. DATA is passed through the recursion. */ | |
728 | |
729 static void | |
730 lower_gimple_return (gimple_stmt_iterator *gsi, struct lower_data *data) | |
731 { | |
732 gimple stmt = gsi_stmt (*gsi); | |
733 gimple t; | |
734 int i; | |
735 return_statements_t tmp_rs; | |
736 | |
737 /* Match this up with an existing return statement that's been created. */ | |
738 for (i = VEC_length (return_statements_t, data->return_statements) - 1; | |
739 i >= 0; i--) | |
740 { | |
741 tmp_rs = *VEC_index (return_statements_t, data->return_statements, i); | |
742 | |
743 if (gimple_return_retval (stmt) == gimple_return_retval (tmp_rs.stmt)) | |
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744 { |
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745 /* Remove the line number from the representative return statement. |
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746 It now fills in for many such returns. Failure to remove this |
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747 will result in incorrect results for coverage analysis. */ |
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748 gimple_set_location (tmp_rs.stmt, UNKNOWN_LOCATION); |
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749 |
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750 goto found; |
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751 } |
0 | 752 } |
753 | |
754 /* Not found. Create a new label and record the return statement. */ | |
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755 tmp_rs.label = create_artificial_label (cfun->function_end_locus); |
0 | 756 tmp_rs.stmt = stmt; |
757 VEC_safe_push (return_statements_t, heap, data->return_statements, &tmp_rs); | |
758 | |
759 /* Generate a goto statement and remove the return statement. */ | |
760 found: | |
761 t = gimple_build_goto (tmp_rs.label); | |
762 gimple_set_location (t, gimple_location (stmt)); | |
763 gimple_set_block (t, gimple_block (stmt)); | |
764 gsi_insert_before (gsi, t, GSI_SAME_STMT); | |
765 gsi_remove (gsi, false); | |
766 } | |
767 | |
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768 /* Lower a __builtin_setjmp GSI. |
0 | 769 |
770 __builtin_setjmp is passed a pointer to an array of five words (not | |
771 all will be used on all machines). It operates similarly to the C | |
772 library function of the same name, but is more efficient. | |
773 | |
774 It is lowered into 3 other builtins, namely __builtin_setjmp_setup, | |
775 __builtin_setjmp_dispatcher and __builtin_setjmp_receiver, but with | |
776 __builtin_setjmp_dispatcher shared among all the instances; that's | |
777 why it is only emitted at the end by lower_function_body. | |
778 | |
779 After full lowering, the body of the function should look like: | |
780 | |
781 { | |
782 void * setjmpvar.0; | |
783 int D.1844; | |
784 int D.2844; | |
785 | |
786 [...] | |
787 | |
788 __builtin_setjmp_setup (&buf, &<D1847>); | |
789 D.1844 = 0; | |
790 goto <D1846>; | |
791 <D1847>:; | |
792 __builtin_setjmp_receiver (&<D1847>); | |
793 D.1844 = 1; | |
794 <D1846>:; | |
795 if (D.1844 == 0) goto <D1848>; else goto <D1849>; | |
796 | |
797 [...] | |
798 | |
799 __builtin_setjmp_setup (&buf, &<D2847>); | |
800 D.2844 = 0; | |
801 goto <D2846>; | |
802 <D2847>:; | |
803 __builtin_setjmp_receiver (&<D2847>); | |
804 D.2844 = 1; | |
805 <D2846>:; | |
806 if (D.2844 == 0) goto <D2848>; else goto <D2849>; | |
807 | |
808 [...] | |
809 | |
810 <D3850>:; | |
811 return; | |
812 <D3853>: [non-local]; | |
813 setjmpvar.0 = __builtin_setjmp_dispatcher (&<D3853>); | |
814 goto setjmpvar.0; | |
815 } | |
816 | |
817 The dispatcher block will be both the unique destination of all the | |
818 abnormal call edges and the unique source of all the abnormal edges | |
819 to the receivers, thus keeping the complexity explosion localized. */ | |
820 | |
821 static void | |
822 lower_builtin_setjmp (gimple_stmt_iterator *gsi) | |
823 { | |
824 gimple stmt = gsi_stmt (*gsi); | |
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825 location_t loc = gimple_location (stmt); |
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826 tree cont_label = create_artificial_label (loc); |
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827 tree next_label = create_artificial_label (loc); |
0 | 828 tree dest, t, arg; |
829 gimple g; | |
830 | |
831 /* NEXT_LABEL is the label __builtin_longjmp will jump to. Its address is | |
832 passed to both __builtin_setjmp_setup and __builtin_setjmp_receiver. */ | |
833 FORCED_LABEL (next_label) = 1; | |
834 | |
835 dest = gimple_call_lhs (stmt); | |
836 | |
837 /* Build '__builtin_setjmp_setup (BUF, NEXT_LABEL)' and insert. */ | |
838 arg = build_addr (next_label, current_function_decl); | |
839 t = implicit_built_in_decls[BUILT_IN_SETJMP_SETUP]; | |
840 g = gimple_build_call (t, 2, gimple_call_arg (stmt, 0), arg); | |
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841 gimple_set_location (g, loc); |
0 | 842 gimple_set_block (g, gimple_block (stmt)); |
843 gsi_insert_before (gsi, g, GSI_SAME_STMT); | |
844 | |
845 /* Build 'DEST = 0' and insert. */ | |
846 if (dest) | |
847 { | |
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848 g = gimple_build_assign (dest, build_zero_cst (TREE_TYPE (dest))); |
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849 gimple_set_location (g, loc); |
0 | 850 gimple_set_block (g, gimple_block (stmt)); |
851 gsi_insert_before (gsi, g, GSI_SAME_STMT); | |
852 } | |
853 | |
854 /* Build 'goto CONT_LABEL' and insert. */ | |
855 g = gimple_build_goto (cont_label); | |
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856 gsi_insert_before (gsi, g, GSI_SAME_STMT); |
0 | 857 |
858 /* Build 'NEXT_LABEL:' and insert. */ | |
859 g = gimple_build_label (next_label); | |
860 gsi_insert_before (gsi, g, GSI_SAME_STMT); | |
861 | |
862 /* Build '__builtin_setjmp_receiver (NEXT_LABEL)' and insert. */ | |
863 arg = build_addr (next_label, current_function_decl); | |
864 t = implicit_built_in_decls[BUILT_IN_SETJMP_RECEIVER]; | |
865 g = gimple_build_call (t, 1, arg); | |
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866 gimple_set_location (g, loc); |
0 | 867 gimple_set_block (g, gimple_block (stmt)); |
868 gsi_insert_before (gsi, g, GSI_SAME_STMT); | |
869 | |
870 /* Build 'DEST = 1' and insert. */ | |
871 if (dest) | |
872 { | |
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873 g = gimple_build_assign (dest, fold_convert_loc (loc, TREE_TYPE (dest), |
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874 integer_one_node)); |
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875 gimple_set_location (g, loc); |
0 | 876 gimple_set_block (g, gimple_block (stmt)); |
877 gsi_insert_before (gsi, g, GSI_SAME_STMT); | |
878 } | |
879 | |
880 /* Build 'CONT_LABEL:' and insert. */ | |
881 g = gimple_build_label (cont_label); | |
882 gsi_insert_before (gsi, g, GSI_SAME_STMT); | |
883 | |
884 /* Remove the call to __builtin_setjmp. */ | |
885 gsi_remove (gsi, false); | |
886 } | |
887 | |
888 | |
889 /* Record the variables in VARS into function FN. */ | |
890 | |
891 void | |
892 record_vars_into (tree vars, tree fn) | |
893 { | |
894 if (fn != current_function_decl) | |
895 push_cfun (DECL_STRUCT_FUNCTION (fn)); | |
896 | |
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897 for (; vars; vars = DECL_CHAIN (vars)) |
0 | 898 { |
899 tree var = vars; | |
900 | |
901 /* BIND_EXPRs contains also function/type/constant declarations | |
902 we don't need to care about. */ | |
903 if (TREE_CODE (var) != VAR_DECL) | |
904 continue; | |
905 | |
906 /* Nothing to do in this case. */ | |
907 if (DECL_EXTERNAL (var)) | |
908 continue; | |
909 | |
910 /* Record the variable. */ | |
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911 add_local_decl (cfun, var); |
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912 if (gimple_referenced_vars (cfun)) |
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913 add_referenced_var (var); |
0 | 914 } |
915 | |
916 if (fn != current_function_decl) | |
917 pop_cfun (); | |
918 } | |
919 | |
920 | |
921 /* Record the variables in VARS into current_function_decl. */ | |
922 | |
923 void | |
924 record_vars (tree vars) | |
925 { | |
926 record_vars_into (vars, current_function_decl); | |
927 } |