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8d08fdba | 1 | /* Handle exceptional things in C++. |
a6ecf8b6 | 2 | Copyright (C) 1989, 92-97, 1998, 1999 Free Software Foundation, Inc. |
8d2733ca MS |
3 | Contributed by Michael Tiemann <tiemann@cygnus.com> |
4 | Rewritten by Mike Stump <mrs@cygnus.com>, based upon an | |
5 | initial re-implementation courtesy Tad Hunt. | |
8d08fdba MS |
6 | |
7 | This file is part of GNU CC. | |
8 | ||
9 | GNU CC is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2, or (at your option) | |
12 | any later version. | |
13 | ||
14 | GNU CC is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with GNU CC; see the file COPYING. If not, write to | |
e9fa0c7c RK |
21 | the Free Software Foundation, 59 Temple Place - Suite 330, |
22 | Boston, MA 02111-1307, USA. */ | |
8d08fdba MS |
23 | |
24 | ||
8d08fdba | 25 | #include "config.h" |
8d052bc7 | 26 | #include "system.h" |
8d08fdba MS |
27 | #include "tree.h" |
28 | #include "rtl.h" | |
29 | #include "cp-tree.h" | |
30 | #include "flags.h" | |
8d2733ca MS |
31 | #include "obstack.h" |
32 | #include "expr.h" | |
21451173 | 33 | #include "output.h" |
6467930b | 34 | #include "except.h" |
0021b564 | 35 | #include "defaults.h" |
54f92bfb | 36 | #include "toplev.h" |
9a0d1e1b | 37 | #include "eh-common.h" |
8d08fdba | 38 | |
49c249e1 | 39 | static void push_eh_cleanup PROTO((void)); |
49c249e1 JM |
40 | static tree build_eh_type_type PROTO((tree)); |
41 | static tree build_eh_type PROTO((tree)); | |
42 | static void expand_end_eh_spec PROTO((tree)); | |
69ac77ce JL |
43 | static tree call_eh_info PROTO((void)); |
44 | static void push_eh_info PROTO((void)); | |
45 | static tree get_eh_info PROTO((void)); | |
46 | static tree get_eh_value PROTO((void)); | |
87603ed0 | 47 | #if 0 |
69ac77ce JL |
48 | static tree get_eh_type PROTO((void)); |
49 | static tree get_eh_caught PROTO((void)); | |
50 | static tree get_eh_handlers PROTO((void)); | |
e833cb11 | 51 | #endif |
69ac77ce | 52 | static tree do_pop_exception PROTO((void)); |
3c5c0849 | 53 | static void process_start_catch_block PROTO((tree)); |
5816cb14 | 54 | static tree build_eh_type_type_ref PROTO((tree)); |
c6160f8f JM |
55 | static tree build_terminate_handler PROTO((void)); |
56 | static tree alloc_eh_object PROTO((tree)); | |
4cfbc546 | 57 | static int complete_ptr_ref_or_void_ptr_p PROTO((tree, tree)); |
8d2733ca | 58 | |
8d2733ca | 59 | #if 0 |
e92cc029 | 60 | /* This is the startup, and finish stuff per exception table. */ |
8d08fdba | 61 | |
8d2733ca MS |
62 | /* XXX - Tad: exception handling section */ |
63 | #ifndef EXCEPT_SECTION_ASM_OP | |
64 | #define EXCEPT_SECTION_ASM_OP "section\t.gcc_except_table,\"a\",@progbits" | |
65 | #endif | |
8d08fdba | 66 | |
8d2733ca | 67 | #ifdef EXCEPT_SECTION_ASM_OP |
8d08fdba | 68 | |
8d2733ca MS |
69 | /* on machines which support it, the exception table lives in another section, |
70 | but it needs a label so we can reference it... This sets up that | |
71 | label! */ | |
72 | asm (EXCEPT_SECTION_ASM_OP); | |
73 | exception_table __EXCEPTION_TABLE__[1] = { (void*)0, (void*)0, (void*)0 }; | |
74 | asm (TEXT_SECTION_ASM_OP); | |
8d08fdba | 75 | |
8d2733ca | 76 | #endif /* EXCEPT_SECTION_ASM_OP */ |
8d08fdba | 77 | |
8d2733ca MS |
78 | #ifdef EXCEPT_SECTION_ASM_OP |
79 | ||
80 | /* we need to know where the end of the exception table is... so this | |
81 | is how we do it! */ | |
82 | ||
83 | asm (EXCEPT_SECTION_ASM_OP); | |
84 | exception_table __EXCEPTION_END__[1] = { (void*)-1, (void*)-1, (void*)-1 }; | |
85 | asm (TEXT_SECTION_ASM_OP); | |
86 | ||
87 | #endif /* EXCEPT_SECTION_ASM_OP */ | |
88 | ||
89 | #endif | |
8d08fdba | 90 | |
8d2733ca | 91 | #include "decl.h" |
8d2733ca MS |
92 | #include "insn-flags.h" |
93 | #include "obstack.h" | |
8d2733ca MS |
94 | |
95 | /* ====================================================================== | |
96 | Briefly the algorithm works like this: | |
97 | ||
98 | When a constructor or start of a try block is encountered, | |
99 | push_eh_entry (&eh_stack) is called. Push_eh_entry () creates a | |
100 | new entry in the unwind protection stack and returns a label to | |
101 | output to start the protection for that block. | |
102 | ||
103 | When a destructor or end try block is encountered, pop_eh_entry | |
6467930b MS |
104 | (&eh_stack) is called. Pop_eh_entry () returns the eh_entry it |
105 | created when push_eh_entry () was called. The eh_entry structure | |
8d2733ca MS |
106 | contains three things at this point. The start protect label, |
107 | the end protect label, and the exception handler label. The end | |
108 | protect label should be output before the call to the destructor | |
109 | (if any). If it was a destructor, then its parse tree is stored | |
6467930b | 110 | in the finalization variable in the eh_entry structure. Otherwise |
8d2733ca | 111 | the finalization variable is set to NULL to reflect the fact that |
38e01259 | 112 | it is the end of a try block. Next, this modified eh_entry node |
8d2733ca MS |
113 | is enqueued in the finalizations queue by calling |
114 | enqueue_eh_entry (&queue,entry). | |
115 | ||
116 | +---------------------------------------------------------------+ | |
117 | |XXX: Will need modification to deal with partially | | |
118 | | constructed arrays of objects | | |
119 | | | | |
120 | | Basically, this consists of keeping track of how many | | |
121 | | of the objects have been constructed already (this | | |
122 | | should be in a register though, so that shouldn't be a | | |
123 | | problem. | | |
124 | +---------------------------------------------------------------+ | |
125 | ||
126 | When a catch block is encountered, there is a lot of work to be | |
127 | done. | |
128 | ||
129 | Since we don't want to generate the catch block inline with the | |
130 | regular flow of the function, we need to have some way of doing | |
f30432d7 MS |
131 | so. Luckily, we can use sequences to defer the catch sections. |
132 | When the start of a catch block is encountered, we start the | |
133 | sequence. After the catch block is generated, we end the | |
134 | sequence. | |
135 | ||
8d2733ca MS |
136 | Next we must insure that when the catch block is executed, all |
137 | finalizations for the matching try block have been completed. If | |
138 | any of those finalizations throw an exception, we must call | |
139 | terminate according to the ARM (section r.15.6.1). What this | |
140 | means is that we need to dequeue and emit finalizations for each | |
6467930b | 141 | entry in the eh_queue until we get to an entry with a NULL |
8d2733ca MS |
142 | finalization field. For any of the finalization entries, if it |
143 | is not a call to terminate (), we must protect it by giving it | |
144 | another start label, end label, and exception handler label, | |
145 | setting its finalization tree to be a call to terminate (), and | |
6467930b | 146 | enqueue'ing this new eh_entry to be output at an outer level. |
8d2733ca MS |
147 | Finally, after all that is done, we can get around to outputting |
148 | the catch block which basically wraps all the "catch (...) {...}" | |
149 | statements in a big if/then/else construct that matches the | |
150 | correct block to call. | |
151 | ||
152 | ===================================================================== */ | |
153 | ||
8d2733ca MS |
154 | /* ====================================================================== */ |
155 | ||
8d2733ca | 156 | /* sets up all the global eh stuff that needs to be initialized at the |
bbd0d54a | 157 | start of compilation. */ |
8d08fdba | 158 | |
8d08fdba | 159 | void |
8d2733ca | 160 | init_exception_processing () |
8d08fdba | 161 | { |
6633d636 MS |
162 | /* void vtype () */ |
163 | tree vtype = build_function_type (void_type_node, void_list_node); | |
164 | ||
2c73f9f5 ML |
165 | if (flag_honor_std) |
166 | push_namespace (get_identifier ("std")); | |
c2a37c55 | 167 | terminate_node = auto_function (get_identifier ("terminate"), vtype); |
9cd64686 | 168 | TREE_THIS_VOLATILE (terminate_node) = 1; |
2c73f9f5 ML |
169 | if (flag_honor_std) |
170 | pop_namespace (); | |
8ccc31eb | 171 | |
9a0d1e1b AM |
172 | set_exception_lang_code (EH_LANG_C_plus_plus); |
173 | set_exception_version_code (1); | |
9a0d1e1b | 174 | |
eb66be0e MS |
175 | /* If we use setjmp/longjmp EH, arrange for all cleanup actions to |
176 | be protected with __terminate. */ | |
177 | protect_cleanup_actions_with_terminate = 1; | |
8d2733ca MS |
178 | } |
179 | ||
95e8dcba | 180 | /* Retrieve a pointer to the cp_eh_info node for the current exception. */ |
6874c264 | 181 | |
95e8dcba JM |
182 | static tree |
183 | call_eh_info () | |
6874c264 | 184 | { |
95e8dcba | 185 | tree fn; |
6874c264 | 186 | |
e6cfb550 | 187 | fn = get_identifier ("__start_cp_handler"); |
6874c264 JM |
188 | if (IDENTIFIER_GLOBAL_VALUE (fn)) |
189 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
190 | else | |
191 | { | |
a1622f83 | 192 | tree t1, t, fields[7]; |
6874c264 | 193 | |
e6cfb550 | 194 | /* Declare cp_eh_info * __start_cp_handler (void), |
6874c264 | 195 | as defined in exception.cc. */ |
9188c363 | 196 | push_permanent_obstack (); |
6874c264 JM |
197 | |
198 | /* struct cp_eh_info. This must match exception.cc. Note that this | |
199 | type is not pushed anywhere. */ | |
9a0d1e1b | 200 | t1= make_lang_type (RECORD_TYPE); |
4ce3d537 | 201 | fields[0] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 202 | get_identifier ("handler_label"), ptr_type_node); |
4ce3d537 | 203 | fields[1] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 204 | get_identifier ("dynamic_handler_chain"), ptr_type_node); |
4ce3d537 | 205 | fields[2] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 206 | get_identifier ("info"), ptr_type_node); |
4ce3d537 | 207 | fields[3] = build_lang_decl (FIELD_DECL, |
e6cfb550 | 208 | get_identifier ("table_index"), ptr_type_node); |
9a0d1e1b AM |
209 | /* N.B.: The fourth field LEN is expected to be |
210 | the number of fields - 1, not the total number of fields. */ | |
e6cfb550 | 211 | finish_builtin_type (t1, "eh_context", fields, 3, ptr_type_node); |
9a0d1e1b AM |
212 | t1 = build_pointer_type (t1); |
213 | ||
214 | t1= make_lang_type (RECORD_TYPE); | |
4ce3d537 | 215 | fields[0] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 216 | get_identifier ("match_function"), ptr_type_node); |
4ce3d537 | 217 | fields[1] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 218 | get_identifier ("language"), short_integer_type_node); |
4ce3d537 | 219 | fields[2] = build_lang_decl (FIELD_DECL, |
9a0d1e1b AM |
220 | get_identifier ("version"), short_integer_type_node); |
221 | /* N.B.: The fourth field LEN is expected to be | |
222 | the number of fields - 1, not the total number of fields. */ | |
5816cb14 | 223 | finish_builtin_type (t1, "__eh_info", fields, 2, ptr_type_node); |
6874c264 | 224 | t = make_lang_type (RECORD_TYPE); |
4ce3d537 MM |
225 | fields[0] = build_lang_decl (FIELD_DECL, |
226 | get_identifier ("eh_info"), t1); | |
227 | fields[1] = build_lang_decl (FIELD_DECL, get_identifier ("value"), | |
228 | ptr_type_node); | |
229 | fields[2] = build_lang_decl (FIELD_DECL, get_identifier ("type"), | |
230 | ptr_type_node); | |
231 | fields[3] = build_lang_decl | |
6874c264 JM |
232 | (FIELD_DECL, get_identifier ("cleanup"), |
233 | build_pointer_type (build_function_type | |
234 | (ptr_type_node, tree_cons | |
235 | (NULL_TREE, ptr_type_node, void_list_node)))); | |
4ce3d537 MM |
236 | fields[4] = build_lang_decl (FIELD_DECL, get_identifier ("caught"), |
237 | boolean_type_node); | |
238 | fields[5] = build_lang_decl (FIELD_DECL, get_identifier ("next"), | |
239 | build_pointer_type (t)); | |
240 | fields[6] = build_lang_decl | |
20b90169 | 241 | (FIELD_DECL, get_identifier ("handlers"), long_integer_type_node); |
cf9d67e3 BK |
242 | /* N.B.: The fourth field LEN is expected to be |
243 | the number of fields - 1, not the total number of fields. */ | |
a1622f83 | 244 | finish_builtin_type (t, "cp_eh_info", fields, 6, ptr_type_node); |
6874c264 JM |
245 | t = build_pointer_type (t); |
246 | ||
247 | /* And now the function. */ | |
248 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
249 | build_function_type (t, void_list_node)); | |
250 | DECL_EXTERNAL (fn) = 1; | |
251 | TREE_PUBLIC (fn) = 1; | |
252 | DECL_ARTIFICIAL (fn) = 1; | |
253 | pushdecl_top_level (fn); | |
254 | make_function_rtl (fn); | |
6874c264 JM |
255 | pop_obstacks (); |
256 | } | |
a6ecf8b6 | 257 | mark_used (fn); |
95e8dcba JM |
258 | return build_function_call (fn, NULL_TREE); |
259 | } | |
260 | ||
261 | /* Retrieve a pointer to the cp_eh_info node for the current exception | |
262 | and save it in the current binding level. */ | |
263 | ||
264 | static void | |
265 | push_eh_info () | |
266 | { | |
267 | tree decl, fn = call_eh_info (); | |
6874c264 JM |
268 | |
269 | /* Remember the pointer to the current exception info; it won't change | |
270 | during this catch block. */ | |
271 | decl = build_decl (VAR_DECL, get_identifier ("__exception_info"), | |
272 | TREE_TYPE (fn)); | |
273 | DECL_ARTIFICIAL (decl) = 1; | |
274 | DECL_INITIAL (decl) = fn; | |
275 | decl = pushdecl (decl); | |
276 | cp_finish_decl (decl, fn, NULL_TREE, 0, 0); | |
277 | } | |
278 | ||
279 | /* Returns a reference to the cp_eh_info node for the current exception. */ | |
280 | ||
281 | static tree | |
282 | get_eh_info () | |
283 | { | |
284 | /* Look for the pointer pushed in push_eh_info. */ | |
285 | tree t = lookup_name (get_identifier ("__exception_info"), 0); | |
286 | return build_indirect_ref (t, NULL_PTR); | |
287 | } | |
288 | ||
289 | /* Returns a reference to the current exception object. */ | |
290 | ||
291 | static tree | |
292 | get_eh_value () | |
293 | { | |
294 | return build_component_ref (get_eh_info (), get_identifier ("value"), | |
295 | NULL_TREE, 0); | |
296 | } | |
297 | ||
298 | /* Returns a reference to the current exception type. */ | |
299 | ||
87603ed0 | 300 | #if 0 |
6874c264 JM |
301 | static tree |
302 | get_eh_type () | |
303 | { | |
304 | return build_component_ref (get_eh_info (), get_identifier ("type"), | |
305 | NULL_TREE, 0); | |
306 | } | |
307 | ||
308 | /* Returns a reference to whether or not the current exception | |
309 | has been caught. */ | |
310 | ||
311 | static tree | |
312 | get_eh_caught () | |
313 | { | |
314 | return build_component_ref (get_eh_info (), get_identifier ("caught"), | |
315 | NULL_TREE, 0); | |
316 | } | |
317 | ||
20b90169 JM |
318 | /* Returns a reference to whether or not the current exception |
319 | has been caught. */ | |
320 | ||
321 | static tree | |
322 | get_eh_handlers () | |
323 | { | |
324 | return build_component_ref (get_eh_info (), get_identifier ("handlers"), | |
325 | NULL_TREE, 0); | |
326 | } | |
e833cb11 | 327 | #endif |
20b90169 | 328 | |
f30432d7 MS |
329 | /* Build a type value for use at runtime for a type that is matched |
330 | against by the exception handling system. */ | |
6467930b | 331 | |
f30432d7 MS |
332 | static tree |
333 | build_eh_type_type (type) | |
334 | tree type; | |
8d08fdba | 335 | { |
d8e178a0 | 336 | const char *typestring; |
f30432d7 | 337 | tree exp; |
8d2733ca | 338 | |
f30432d7 MS |
339 | if (type == error_mark_node) |
340 | return error_mark_node; | |
8d2733ca | 341 | |
e92cc029 | 342 | /* peel back references, so they match. */ |
f30432d7 MS |
343 | if (TREE_CODE (type) == REFERENCE_TYPE) |
344 | type = TREE_TYPE (type); | |
8d08fdba | 345 | |
e92cc029 | 346 | /* Peel off cv qualifiers. */ |
f30432d7 | 347 | type = TYPE_MAIN_VARIANT (type); |
8d2733ca | 348 | |
f30432d7 | 349 | if (flag_rtti) |
6a8f78d5 | 350 | return build1 (ADDR_EXPR, ptr_type_node, get_typeid_1 (type)); |
f30432d7 MS |
351 | |
352 | typestring = build_overload_name (type, 1, 1); | |
353 | exp = combine_strings (build_string (strlen (typestring)+1, typestring)); | |
354 | return build1 (ADDR_EXPR, ptr_type_node, exp); | |
8d08fdba | 355 | } |
8d08fdba | 356 | |
5816cb14 AM |
357 | /* Build the address of a runtime type for use in the runtime matching |
358 | field of the new exception model */ | |
359 | ||
360 | static tree | |
361 | build_eh_type_type_ref (type) | |
362 | tree type; | |
363 | { | |
d8e178a0 | 364 | const char *typestring; |
5816cb14 | 365 | tree exp; |
5816cb14 AM |
366 | |
367 | if (type == error_mark_node) | |
368 | return error_mark_node; | |
369 | ||
370 | /* peel back references, so they match. */ | |
371 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
372 | type = TREE_TYPE (type); | |
373 | ||
374 | /* Peel off cv qualifiers. */ | |
375 | type = TYPE_MAIN_VARIANT (type); | |
376 | ||
9188c363 | 377 | push_permanent_obstack (); |
5816cb14 AM |
378 | |
379 | if (flag_rtti) | |
380 | { | |
381 | exp = get_tinfo_fn (type); | |
382 | TREE_USED (exp) = 1; | |
383 | mark_inline_for_output (exp); | |
384 | exp = build1 (ADDR_EXPR, ptr_type_node, exp); | |
385 | } | |
386 | else | |
387 | { | |
388 | typestring = build_overload_name (type, 1, 1); | |
389 | exp = combine_strings (build_string (strlen (typestring)+1, typestring)); | |
390 | exp = build1 (ADDR_EXPR, ptr_type_node, exp); | |
391 | } | |
392 | pop_obstacks (); | |
393 | return (exp); | |
394 | } | |
395 | ||
396 | ||
faae18ab MS |
397 | /* Build a type value for use at runtime for a exp that is thrown or |
398 | matched against by the exception handling system. */ | |
6467930b | 399 | |
faae18ab MS |
400 | static tree |
401 | build_eh_type (exp) | |
402 | tree exp; | |
403 | { | |
faae18ab MS |
404 | if (flag_rtti) |
405 | { | |
406 | exp = build_typeid (exp); | |
407 | return build1 (ADDR_EXPR, ptr_type_node, exp); | |
408 | } | |
f30432d7 | 409 | return build_eh_type_type (TREE_TYPE (exp)); |
faae18ab MS |
410 | } |
411 | ||
9c606f69 AM |
412 | /* This routine is called to mark all the symbols representing runtime |
413 | type functions in the exception table as haveing been referenced. | |
414 | This will make sure code is emitted for them. Called from finish_file. */ | |
415 | void | |
416 | mark_all_runtime_matches () | |
417 | { | |
418 | int x,num; | |
419 | void **ptr; | |
420 | tree exp; | |
421 | ||
422 | num = find_all_handler_type_matches (&ptr); | |
423 | if (num == 0 || ptr == NULL) | |
424 | return; | |
425 | ||
426 | for (x=0; x <num; x++) | |
427 | { | |
428 | exp = (tree) ptr[x]; | |
429 | if (TREE_CODE (exp) == ADDR_EXPR) | |
430 | { | |
431 | exp = TREE_OPERAND (exp, 0); | |
432 | if (TREE_CODE (exp) == FUNCTION_DECL) | |
433 | TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (exp)) = 1; | |
434 | } | |
435 | } | |
436 | ||
437 | free (ptr); | |
438 | } | |
439 | ||
c7ae64f2 JM |
440 | /* Build up a call to __cp_pop_exception, to destroy the exception object |
441 | for the current catch block. HANDLER is either true or false, telling | |
442 | the library whether or not it is being called from an exception handler; | |
443 | if it is, it avoids destroying the object on rethrow. */ | |
6467930b | 444 | |
c7ae64f2 | 445 | static tree |
de35891e | 446 | do_pop_exception () |
72b7eeff | 447 | { |
6874c264 | 448 | tree fn, cleanup; |
6874c264 JM |
449 | fn = get_identifier ("__cp_pop_exception"); |
450 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
451 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
452 | else | |
453 | { | |
c7ae64f2 JM |
454 | /* Declare void __cp_pop_exception (void *), |
455 | as defined in exception.cc. */ | |
9188c363 | 456 | push_permanent_obstack (); |
c7ae64f2 JM |
457 | fn = build_lang_decl |
458 | (FUNCTION_DECL, fn, | |
459 | build_function_type (void_type_node, tree_cons | |
de35891e | 460 | (NULL_TREE, ptr_type_node, void_list_node))); |
6874c264 JM |
461 | DECL_EXTERNAL (fn) = 1; |
462 | TREE_PUBLIC (fn) = 1; | |
463 | DECL_ARTIFICIAL (fn) = 1; | |
464 | pushdecl_top_level (fn); | |
465 | make_function_rtl (fn); | |
6874c264 JM |
466 | pop_obstacks (); |
467 | } | |
72b7eeff | 468 | |
a6ecf8b6 | 469 | mark_used (fn); |
72b7eeff | 470 | /* Arrange to do a dynamically scoped cleanup upon exit from this region. */ |
c7ae64f2 | 471 | cleanup = lookup_name (get_identifier ("__exception_info"), 0); |
e1b3e07d | 472 | cleanup = build_function_call (fn, tree_cons |
de35891e | 473 | (NULL_TREE, cleanup, NULL_TREE)); |
c0700ea5 | 474 | return cleanup; |
c7ae64f2 JM |
475 | } |
476 | ||
477 | /* This routine creates the cleanup for the current exception. */ | |
72b7eeff | 478 | |
c7ae64f2 JM |
479 | static void |
480 | push_eh_cleanup () | |
481 | { | |
de35891e | 482 | int yes; |
72b7eeff | 483 | |
de35891e JM |
484 | yes = suspend_momentary (); |
485 | /* All cleanups must last longer than normal. */ | |
486 | expand_decl_cleanup (NULL_TREE, do_pop_exception ()); | |
487 | resume_momentary (yes); | |
c7ae64f2 | 488 | } |
72b7eeff | 489 | |
f4a23343 JM |
490 | /* Build up a call to terminate on the function obstack, for use as an |
491 | exception handler. */ | |
492 | ||
c6160f8f | 493 | static tree |
f4a23343 JM |
494 | build_terminate_handler () |
495 | { | |
496 | int yes = suspend_momentary (); | |
9cd64686 | 497 | tree term = build_function_call (terminate_node, NULL_TREE); |
f4a23343 JM |
498 | resume_momentary (yes); |
499 | return term; | |
500 | } | |
501 | ||
5816cb14 | 502 | /* Call this to start a catch block. Typename is the typename, and identifier |
8d2733ca MS |
503 | is the variable to place the object in or NULL if the variable doesn't |
504 | matter. If typename is NULL, that means its a "catch (...)" or catch | |
505 | everything. In that case we don't need to do any type checking. | |
506 | (ie: it ends up as the "else" clause rather than an "else if" clause) */ | |
6467930b | 507 | |
8d08fdba | 508 | void |
3c5c0849 MM |
509 | expand_start_catch_block (decl) |
510 | tree decl; | |
8d08fdba | 511 | { |
558475f0 | 512 | if (building_stmt_tree ()) |
faf5394a | 513 | { |
3c5c0849 | 514 | if (decl) |
faf5394a | 515 | { |
3c5c0849 MM |
516 | /* We must ensure that DECL_CONTEXT is set up before we call |
517 | push_template_decl; that code depends on DECL_CONTEXT | |
518 | being set correctly. */ | |
519 | DECL_CONTEXT (decl) = current_function_decl; | |
f18a14bc MM |
520 | if (processing_template_decl) |
521 | decl = push_template_decl (decl); | |
faf5394a | 522 | pushdecl (decl); |
558475f0 | 523 | add_decl_stmt (decl); |
faf5394a MS |
524 | } |
525 | return; | |
526 | } | |
527 | ||
8d2733ca MS |
528 | if (! doing_eh (1)) |
529 | return; | |
530 | ||
3c5c0849 | 531 | process_start_catch_block (decl); |
5816cb14 AM |
532 | } |
533 | ||
5816cb14 AM |
534 | /* This function performs the expand_start_catch_block functionality for |
535 | exceptions implemented in the new style. __throw determines whether | |
536 | a handler needs to be called or not, so the handler itself has to do | |
bf71cd2e | 537 | nothing additional. */ |
5816cb14 AM |
538 | |
539 | static void | |
3c5c0849 MM |
540 | process_start_catch_block (decl) |
541 | tree decl; | |
5816cb14 | 542 | { |
5816cb14 AM |
543 | tree init; |
544 | ||
545 | /* Create a binding level for the eh_info and the exception object | |
546 | cleanup. */ | |
547 | pushlevel (0); | |
548 | expand_start_bindings (0); | |
549 | ||
3c5c0849 MM |
550 | if (decl && !complete_ptr_ref_or_void_ptr_p (TREE_TYPE (decl), NULL_TREE)) |
551 | decl = NULL_TREE; | |
5816cb14 AM |
552 | |
553 | if (decl) | |
554 | start_catch_handler (build_eh_type_type_ref (TREE_TYPE (decl))); | |
555 | else | |
9c606f69 | 556 | start_catch_handler (CATCH_ALL_TYPE); |
5816cb14 AM |
557 | |
558 | emit_line_note (input_filename, lineno); | |
559 | ||
560 | push_eh_info (); | |
561 | ||
562 | if (decl) | |
563 | { | |
564 | tree exp; | |
5816cb14 AM |
565 | tree init_type; |
566 | ||
567 | /* Make sure we mark the catch param as used, otherwise we'll get | |
568 | a warning about an unused ((anonymous)). */ | |
569 | TREE_USED (decl) = 1; | |
570 | ||
571 | /* Figure out the type that the initializer is. */ | |
572 | init_type = TREE_TYPE (decl); | |
573 | if (TREE_CODE (init_type) != REFERENCE_TYPE | |
574 | && TREE_CODE (init_type) != POINTER_TYPE) | |
575 | init_type = build_reference_type (init_type); | |
576 | ||
577 | exp = get_eh_value (); | |
578 | ||
579 | /* Since pointers are passed by value, initialize a reference to | |
580 | pointer catch parm with the address of the value slot. */ | |
581 | if (TREE_CODE (init_type) == REFERENCE_TYPE | |
582 | && TREE_CODE (TREE_TYPE (init_type)) == POINTER_TYPE) | |
583 | exp = build_unary_op (ADDR_EXPR, exp, 1); | |
584 | ||
585 | exp = ocp_convert (init_type , exp, CONV_IMPLICIT|CONV_FORCE_TEMP, 0); | |
586 | ||
587 | push_eh_cleanup (); | |
588 | ||
589 | /* Create a binding level for the parm. */ | |
590 | pushlevel (0); | |
591 | expand_start_bindings (0); | |
592 | ||
593 | init = convert_from_reference (exp); | |
594 | ||
595 | /* If the constructor for the catch parm exits via an exception, we | |
596 | must call terminate. See eh23.C. */ | |
597 | if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))) | |
598 | { | |
599 | /* Generate the copy constructor call directly so we can wrap it. | |
600 | See also expand_default_init. */ | |
601 | init = ocp_convert (TREE_TYPE (decl), init, | |
602 | CONV_IMPLICIT|CONV_FORCE_TEMP, 0); | |
603 | init = build (TRY_CATCH_EXPR, TREE_TYPE (init), init, | |
604 | build_terminate_handler ()); | |
605 | } | |
606 | ||
607 | /* Let `cp_finish_decl' know that this initializer is ok. */ | |
608 | DECL_INITIAL (decl) = init; | |
609 | decl = pushdecl (decl); | |
610 | ||
bf71cd2e | 611 | start_decl_1 (decl); |
c37dc68e JM |
612 | cp_finish_decl (decl, init, NULL_TREE, 0, |
613 | LOOKUP_ONLYCONVERTING|DIRECT_BIND); | |
5816cb14 AM |
614 | } |
615 | else | |
616 | { | |
617 | push_eh_cleanup (); | |
618 | ||
619 | /* Create a binding level for the parm. */ | |
620 | pushlevel (0); | |
621 | expand_start_bindings (0); | |
622 | ||
623 | /* Fall into the catch all section. */ | |
624 | } | |
625 | ||
5816cb14 AM |
626 | emit_line_note (input_filename, lineno); |
627 | } | |
628 | ||
f30432d7 | 629 | |
8d2733ca MS |
630 | /* Call this to end a catch block. Its responsible for emitting the |
631 | code to handle jumping back to the correct place, and for emitting | |
632 | the label to jump to if this catch block didn't match. */ | |
6467930b | 633 | |
824b9a4c MS |
634 | void |
635 | expand_end_catch_block () | |
8d08fdba | 636 | { |
f30432d7 MS |
637 | if (! doing_eh (1)) |
638 | return; | |
8d2733ca | 639 | |
0dde4175 JM |
640 | /* The exception being handled is rethrown if control reaches the end of |
641 | a handler of the function-try-block of a constructor or destructor. */ | |
642 | if (in_function_try_handler | |
643 | && (DECL_CONSTRUCTOR_P (current_function_decl) | |
644 | || DECL_DESTRUCTOR_P (current_function_decl))) | |
645 | expand_throw (NULL_TREE); | |
646 | ||
c7ae64f2 JM |
647 | /* Cleanup the EH parameter. */ |
648 | expand_end_bindings (getdecls (), kept_level_p (), 0); | |
649 | poplevel (kept_level_p (), 1, 0); | |
650 | ||
c7ae64f2 JM |
651 | /* Cleanup the EH object. */ |
652 | expand_end_bindings (getdecls (), kept_level_p (), 0); | |
653 | poplevel (kept_level_p (), 1, 0); | |
eb66be0e | 654 | |
eb66be0e MS |
655 | /* Fall to outside the try statement when done executing handler and |
656 | we fall off end of handler. This is jump Lresume in the | |
657 | documentation. */ | |
658 | expand_goto (top_label_entry (&caught_return_label_stack)); | |
659 | ||
bf71cd2e | 660 | end_catch_handler (); |
8d2733ca | 661 | } |
8d08fdba | 662 | |
6c20b7e9 JM |
663 | /* An exception spec is implemented more or less like: |
664 | ||
665 | try { | |
666 | function body; | |
667 | } catch (...) { | |
668 | void *p[] = { typeid(raises) }; | |
669 | __check_eh_spec (p, count); | |
670 | } | |
671 | ||
672 | __check_eh_spec in exception.cc handles all the details. */ | |
8d2733ca | 673 | |
f30432d7 MS |
674 | void |
675 | expand_start_eh_spec () | |
676 | { | |
6c20b7e9 | 677 | expand_start_try_stmts (); |
f30432d7 MS |
678 | } |
679 | ||
5566b478 | 680 | static void |
f30432d7 MS |
681 | expand_end_eh_spec (raises) |
682 | tree raises; | |
683 | { | |
6c20b7e9 JM |
684 | tree tmp, fn, decl, types = NULL_TREE; |
685 | int count = 0; | |
f30432d7 | 686 | |
6c20b7e9 | 687 | expand_start_all_catch (); |
3c5c0849 | 688 | expand_start_catch_block (NULL_TREE); |
f30432d7 | 689 | |
6c20b7e9 JM |
690 | /* Build up an array of type_infos. */ |
691 | for (; raises && TREE_VALUE (raises); raises = TREE_CHAIN (raises)) | |
692 | { | |
e1b3e07d | 693 | types = tree_cons |
6c20b7e9 JM |
694 | (NULL_TREE, build_eh_type_type (TREE_VALUE (raises)), types); |
695 | ++count; | |
696 | } | |
eb66be0e | 697 | |
6c20b7e9 JM |
698 | types = build_nt (CONSTRUCTOR, NULL_TREE, types); |
699 | TREE_HAS_CONSTRUCTOR (types) = 1; | |
6874c264 | 700 | |
6c20b7e9 | 701 | /* We can't pass the CONSTRUCTOR directly, so stick it in a variable. */ |
52bf7d5d | 702 | tmp = build_cplus_array_type (const_ptr_type_node, NULL_TREE); |
6c20b7e9 JM |
703 | decl = build_decl (VAR_DECL, NULL_TREE, tmp); |
704 | DECL_ARTIFICIAL (decl) = 1; | |
705 | DECL_INITIAL (decl) = types; | |
706 | cp_finish_decl (decl, types, NULL_TREE, 0, 0); | |
707 | ||
708 | decl = decay_conversion (decl); | |
6874c264 | 709 | |
6c20b7e9 JM |
710 | fn = get_identifier ("__check_eh_spec"); |
711 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
712 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
713 | else | |
f30432d7 | 714 | { |
9188c363 | 715 | push_permanent_obstack (); |
f30432d7 | 716 | |
6c20b7e9 JM |
717 | tmp = tree_cons |
718 | (NULL_TREE, integer_type_node, tree_cons | |
719 | (NULL_TREE, TREE_TYPE (decl), void_list_node)); | |
720 | tmp = build_function_type (void_type_node, tmp); | |
f30432d7 | 721 | |
6c20b7e9 JM |
722 | fn = build_lang_decl (FUNCTION_DECL, fn, tmp); |
723 | DECL_EXTERNAL (fn) = 1; | |
724 | TREE_PUBLIC (fn) = 1; | |
725 | DECL_ARTIFICIAL (fn) = 1; | |
726 | TREE_THIS_VOLATILE (fn) = 1; | |
727 | pushdecl_top_level (fn); | |
728 | make_function_rtl (fn); | |
6c20b7e9 JM |
729 | pop_obstacks (); |
730 | } | |
731 | ||
a6ecf8b6 | 732 | mark_used (fn); |
e1b3e07d MM |
733 | tmp = tree_cons (NULL_TREE, build_int_2 (count, 0), |
734 | tree_cons (NULL_TREE, decl, NULL_TREE)); | |
6c20b7e9 JM |
735 | tmp = build_call (fn, TREE_TYPE (TREE_TYPE (fn)), tmp); |
736 | expand_expr (tmp, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
737 | ||
738 | expand_end_catch_block (); | |
739 | expand_end_all_catch (); | |
f30432d7 MS |
740 | } |
741 | ||
8d2733ca MS |
742 | /* This is called to expand all the toplevel exception handling |
743 | finalization for a function. It should only be called once per | |
744 | function. */ | |
6467930b | 745 | |
8d08fdba | 746 | void |
8d2733ca | 747 | expand_exception_blocks () |
8d08fdba | 748 | { |
92b96838 | 749 | do_pending_stack_adjust (); |
e00737d2 | 750 | push_to_sequence (catch_clauses); |
8d2733ca | 751 | expand_leftover_cleanups (); |
92b96838 | 752 | do_pending_stack_adjust (); |
e00737d2 | 753 | catch_clauses = get_insns (); |
f30432d7 | 754 | end_sequence (); |
eb448459 | 755 | |
eb448459 MS |
756 | /* Do this after we expand leftover cleanups, so that the |
757 | expand_eh_region_end that expand_end_eh_spec does will match the | |
758 | right expand_eh_region_start, and make sure it comes out before | |
759 | the terminate protected region. */ | |
f30432d7 MS |
760 | if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl))) |
761 | { | |
eb448459 | 762 | expand_end_eh_spec (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl))); |
92b96838 | 763 | do_pending_stack_adjust (); |
e00737d2 | 764 | push_to_sequence (catch_clauses); |
eb448459 | 765 | expand_leftover_cleanups (); |
92b96838 | 766 | do_pending_stack_adjust (); |
e00737d2 | 767 | catch_clauses = get_insns (); |
eb448459 | 768 | end_sequence (); |
f30432d7 MS |
769 | } |
770 | ||
e00737d2 | 771 | if (catch_clauses) |
f30432d7 | 772 | { |
e00737d2 MS |
773 | rtx funcend = gen_label_rtx (); |
774 | emit_jump (funcend); | |
775 | ||
eb66be0e MS |
776 | /* We cannot protect n regions this way if we must flow into the |
777 | EH region through the top of the region, as we have to with | |
778 | the setjmp/longjmp approach. */ | |
779 | if (exceptions_via_longjmp == 0) | |
fb98cff6 | 780 | expand_eh_region_start (); |
f30432d7 | 781 | |
e00737d2 MS |
782 | emit_insns (catch_clauses); |
783 | catch_clauses = NULL_RTX; | |
eb66be0e MS |
784 | |
785 | if (exceptions_via_longjmp == 0) | |
f4a23343 | 786 | expand_eh_region_end (build_terminate_handler ()); |
eb66be0e | 787 | |
6467930b | 788 | expand_leftover_cleanups (); |
f30432d7 | 789 | |
e00737d2 MS |
790 | emit_label (funcend); |
791 | } | |
8d08fdba MS |
792 | } |
793 | ||
72b7eeff MS |
794 | tree |
795 | start_anon_func () | |
796 | { | |
797 | static int counter = 0; | |
e92cc029 | 798 | int old_interface_unknown = interface_unknown; |
72b7eeff MS |
799 | char name[32]; |
800 | tree params; | |
801 | tree t; | |
802 | ||
72b7eeff MS |
803 | push_to_top_level (); |
804 | ||
805 | /* No need to mangle this. */ | |
806 | push_lang_context (lang_name_c); | |
807 | ||
e92cc029 MS |
808 | interface_unknown = 1; |
809 | ||
72b7eeff | 810 | params = void_list_node; |
956d6950 | 811 | /* tcf stands for throw clean function. */ |
72b7eeff | 812 | sprintf (name, "__tcf_%d", counter++); |
c11b6f21 MS |
813 | t = make_call_declarator (get_identifier (name), params, NULL_TREE, |
814 | NULL_TREE); | |
72b7eeff MS |
815 | start_function (decl_tree_cons (NULL_TREE, get_identifier ("static"), |
816 | void_list_node), | |
a8f73d4b | 817 | t, NULL_TREE, SF_DEFAULT); |
72b7eeff MS |
818 | store_parm_decls (); |
819 | pushlevel (0); | |
820 | clear_last_expr (); | |
821 | push_momentary (); | |
822 | expand_start_bindings (0); | |
823 | emit_line_note (input_filename, lineno); | |
824 | ||
e92cc029 MS |
825 | interface_unknown = old_interface_unknown; |
826 | ||
72b7eeff MS |
827 | pop_lang_context (); |
828 | ||
829 | return current_function_decl; | |
830 | } | |
831 | ||
832 | void | |
833 | end_anon_func () | |
834 | { | |
fc378698 | 835 | expand_end_bindings (getdecls (), 1, 0); |
72b7eeff MS |
836 | poplevel (1, 0, 0); |
837 | pop_momentary (); | |
838 | ||
87e3dbc9 | 839 | finish_function (lineno, 0); |
72b7eeff MS |
840 | |
841 | pop_from_top_level (); | |
72b7eeff | 842 | } |
8d2733ca | 843 | |
f4a23343 JM |
844 | /* Return a pointer to a buffer for an exception object of type TYPE. */ |
845 | ||
c6160f8f | 846 | static tree |
f4a23343 JM |
847 | alloc_eh_object (type) |
848 | tree type; | |
849 | { | |
850 | tree fn, exp; | |
851 | ||
852 | fn = get_identifier ("__eh_alloc"); | |
853 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
854 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
855 | else | |
856 | { | |
857 | /* Declare __eh_alloc (size_t), as defined in exception.cc. */ | |
858 | tree tmp; | |
9188c363 | 859 | push_permanent_obstack (); |
f4a23343 JM |
860 | tmp = tree_cons (NULL_TREE, sizetype, void_list_node); |
861 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
862 | build_function_type (ptr_type_node, tmp)); | |
863 | DECL_EXTERNAL (fn) = 1; | |
864 | TREE_PUBLIC (fn) = 1; | |
865 | DECL_ARTIFICIAL (fn) = 1; | |
866 | pushdecl_top_level (fn); | |
867 | make_function_rtl (fn); | |
f4a23343 JM |
868 | pop_obstacks (); |
869 | } | |
870 | ||
a6ecf8b6 | 871 | mark_used (fn); |
e1b3e07d | 872 | exp = build_function_call (fn, tree_cons |
f4a23343 JM |
873 | (NULL_TREE, size_in_bytes (type), NULL_TREE)); |
874 | exp = build1 (NOP_EXPR, build_pointer_type (type), exp); | |
875 | return exp; | |
876 | } | |
877 | ||
6467930b | 878 | /* Expand a throw statement. This follows the following |
8d2733ca MS |
879 | algorithm: |
880 | ||
881 | 1. Allocate space to save the current PC onto the stack. | |
882 | 2. Generate and emit a label and save its address into the | |
e1cd6e56 | 883 | newly allocated stack space since we can't save the pc directly. |
8d2733ca MS |
884 | 3. If this is the first call to throw in this function: |
885 | generate a label for the throw block | |
886 | 4. jump to the throw block label. */ | |
6467930b | 887 | |
8d08fdba | 888 | void |
8d2733ca MS |
889 | expand_throw (exp) |
890 | tree exp; | |
8d08fdba | 891 | { |
6874c264 JM |
892 | tree fn; |
893 | static tree cleanup_type; | |
8d08fdba | 894 | |
8d2733ca MS |
895 | if (! doing_eh (1)) |
896 | return; | |
8d08fdba | 897 | |
8d2733ca MS |
898 | if (exp) |
899 | { | |
faae18ab | 900 | tree throw_type; |
6874c264 | 901 | tree cleanup = NULL_TREE, e; |
faae18ab | 902 | |
a3b49ccd | 903 | /* throw expression */ |
e92cc029 | 904 | /* First, decay it. */ |
f30432d7 | 905 | exp = decay_conversion (exp); |
a3b49ccd | 906 | |
6874c264 JM |
907 | /* cleanup_type is void (*)(void *, int), |
908 | the internal type of a destructor. */ | |
909 | if (cleanup_type == NULL_TREE) | |
910 | { | |
9188c363 | 911 | push_permanent_obstack (); |
6874c264 JM |
912 | cleanup_type = build_pointer_type |
913 | (build_function_type | |
914 | (void_type_node, tree_cons | |
915 | (NULL_TREE, ptr_type_node, tree_cons | |
916 | (NULL_TREE, integer_type_node, void_list_node)))); | |
917 | pop_obstacks (); | |
918 | } | |
919 | ||
08b24bda | 920 | if (TYPE_PTR_P (TREE_TYPE (exp))) |
bbeeb2b0 | 921 | throw_type = build_eh_type (exp); |
f30432d7 MS |
922 | else |
923 | { | |
f4a23343 JM |
924 | tree object, ptr; |
925 | ||
926 | /* OK, this is kind of wacky. The WP says that we call | |
927 | terminate | |
928 | ||
929 | when the exception handling mechanism, after completing | |
930 | evaluation of the expression to be thrown but before the | |
931 | exception is caught (_except.throw_), calls a user function | |
932 | that exits via an uncaught exception. | |
933 | ||
934 | So we have to protect the actual initialization of the | |
935 | exception object with terminate(), but evaluate the expression | |
936 | first. We also expand the call to __eh_alloc | |
937 | first. Since there could be temps in the expression, we need | |
938 | to handle that, too. */ | |
a50f0918 | 939 | |
f4a23343 JM |
940 | expand_start_target_temps (); |
941 | ||
942 | #if 0 | |
943 | /* Unfortunately, this doesn't work. */ | |
944 | preexpand_calls (exp); | |
945 | #else | |
946 | /* Store the throw expression into a temp. This can be less | |
947 | efficient than storing it into the allocated space directly, but | |
948 | oh well. To do this efficiently we would need to insinuate | |
949 | ourselves into expand_call. */ | |
950 | if (TREE_SIDE_EFFECTS (exp)) | |
951 | { | |
f1dedc31 | 952 | tree temp = create_temporary_var (TREE_TYPE (exp)); |
c37dc68e JM |
953 | DECL_INITIAL (temp) = exp; |
954 | cp_finish_decl (temp, exp, NULL_TREE, 0, LOOKUP_ONLYCONVERTING); | |
f4a23343 JM |
955 | exp = temp; |
956 | } | |
957 | #endif | |
958 | ||
959 | /* Allocate the space for the exception. */ | |
960 | ptr = save_expr (alloc_eh_object (TREE_TYPE (exp))); | |
961 | expand_expr (ptr, const0_rtx, VOIDmode, 0); | |
962 | ||
963 | expand_eh_region_start (); | |
964 | ||
965 | object = build_indirect_ref (ptr, NULL_PTR); | |
966 | exp = build_modify_expr (object, INIT_EXPR, exp); | |
faae18ab | 967 | |
f30432d7 | 968 | if (exp == error_mark_node) |
8251199e | 969 | error (" in thrown expression"); |
faae18ab | 970 | |
f4a23343 JM |
971 | expand_expr (exp, const0_rtx, VOIDmode, 0); |
972 | expand_eh_region_end (build_terminate_handler ()); | |
973 | expand_end_target_temps (); | |
974 | ||
72b7eeff MS |
975 | throw_type = build_eh_type (object); |
976 | ||
6874c264 JM |
977 | if (TYPE_HAS_DESTRUCTOR (TREE_TYPE (object))) |
978 | { | |
979 | cleanup = lookup_fnfields (TYPE_BINFO (TREE_TYPE (object)), | |
980 | dtor_identifier, 0); | |
981 | cleanup = TREE_VALUE (cleanup); | |
e872bb7a | 982 | mark_used (cleanup); |
6874c264 JM |
983 | mark_addressable (cleanup); |
984 | /* Pretend it's a normal function. */ | |
985 | cleanup = build1 (ADDR_EXPR, cleanup_type, cleanup); | |
986 | } | |
f4a23343 JM |
987 | |
988 | exp = ptr; | |
f30432d7 | 989 | } |
faae18ab | 990 | |
bbeeb2b0 MM |
991 | /* Cast EXP to `void *' so that it will match the prototype for |
992 | __cp_push_exception. */ | |
c37dc68e | 993 | exp = convert (ptr_type_node, exp); |
bbeeb2b0 | 994 | |
6874c264 JM |
995 | if (cleanup == NULL_TREE) |
996 | { | |
997 | cleanup = build_int_2 (0, 0); | |
998 | TREE_TYPE (cleanup) = cleanup_type; | |
999 | } | |
72b7eeff | 1000 | |
6874c264 JM |
1001 | fn = get_identifier ("__cp_push_exception"); |
1002 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
1003 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
1004 | else | |
1005 | { | |
1006 | /* Declare __cp_push_exception (void*, void*, void (*)(void*, int)), | |
1007 | as defined in exception.cc. */ | |
1008 | tree tmp; | |
9188c363 | 1009 | push_permanent_obstack (); |
6874c264 JM |
1010 | tmp = tree_cons |
1011 | (NULL_TREE, ptr_type_node, tree_cons | |
1012 | (NULL_TREE, ptr_type_node, tree_cons | |
1013 | (NULL_TREE, cleanup_type, void_list_node))); | |
1014 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
1015 | build_function_type (void_type_node, tmp)); | |
1016 | DECL_EXTERNAL (fn) = 1; | |
1017 | TREE_PUBLIC (fn) = 1; | |
1018 | DECL_ARTIFICIAL (fn) = 1; | |
1019 | pushdecl_top_level (fn); | |
1020 | make_function_rtl (fn); | |
6874c264 JM |
1021 | pop_obstacks (); |
1022 | } | |
72b7eeff | 1023 | |
a6ecf8b6 | 1024 | mark_used (fn); |
e1b3e07d MM |
1025 | e = tree_cons (NULL_TREE, exp, tree_cons |
1026 | (NULL_TREE, throw_type, tree_cons | |
1027 | (NULL_TREE, cleanup, NULL_TREE))); | |
6874c264 JM |
1028 | e = build_function_call (fn, e); |
1029 | expand_expr (e, const0_rtx, VOIDmode, 0); | |
8d2733ca MS |
1030 | } |
1031 | else | |
a3b49ccd | 1032 | { |
6874c264 JM |
1033 | /* rethrow current exception; note that it's no longer caught. */ |
1034 | ||
1035 | tree fn = get_identifier ("__uncatch_exception"); | |
1036 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
1037 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
1038 | else | |
1039 | { | |
1040 | /* Declare void __uncatch_exception (void) | |
1041 | as defined in exception.cc. */ | |
9188c363 | 1042 | push_permanent_obstack (); |
6874c264 JM |
1043 | fn = build_lang_decl (FUNCTION_DECL, fn, |
1044 | build_function_type (void_type_node, | |
1045 | void_list_node)); | |
1046 | DECL_EXTERNAL (fn) = 1; | |
1047 | TREE_PUBLIC (fn) = 1; | |
1048 | DECL_ARTIFICIAL (fn) = 1; | |
1049 | pushdecl_top_level (fn); | |
1050 | make_function_rtl (fn); | |
6874c264 JM |
1051 | pop_obstacks (); |
1052 | } | |
1053 | ||
a6ecf8b6 | 1054 | mark_used (fn); |
6874c264 JM |
1055 | exp = build_function_call (fn, NULL_TREE); |
1056 | expand_expr (exp, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
a3b49ccd | 1057 | } |
8d2733ca | 1058 | |
e701eb4d | 1059 | expand_internal_throw (); |
f376e137 | 1060 | } |
8d2733ca MS |
1061 | |
1062 | /* Build a throw expression. */ | |
6467930b | 1063 | |
8d2733ca MS |
1064 | tree |
1065 | build_throw (e) | |
1066 | tree e; | |
1067 | { | |
02020185 JM |
1068 | if (e == error_mark_node) |
1069 | return e; | |
1070 | ||
1071 | if (processing_template_decl) | |
1072 | return build_min (THROW_EXPR, void_type_node, e); | |
1073 | ||
e0f9a8bc | 1074 | if (e == null_node) |
8251199e | 1075 | cp_warning ("throwing NULL, which has integral, not pointer type"); |
980c394c NS |
1076 | |
1077 | if (e != NULL_TREE) | |
1078 | { | |
4cfbc546 NS |
1079 | if (!complete_ptr_ref_or_void_ptr_p (TREE_TYPE (e), e)) |
1080 | return error_mark_node; | |
980c394c | 1081 | } |
02020185 JM |
1082 | |
1083 | e = build1 (THROW_EXPR, void_type_node, e); | |
1084 | TREE_SIDE_EFFECTS (e) = 1; | |
1085 | TREE_USED (e) = 1; | |
1086 | ||
8d2733ca | 1087 | return e; |
8d08fdba | 1088 | } |
4cfbc546 NS |
1089 | |
1090 | /* Make sure TYPE is complete, pointer to complete, reference to | |
1091 | complete, or pointer to cv void. Issue diagnostic on failure. | |
1092 | Return the zero on failure and non-zero on success. FROM can be | |
1093 | the expr or decl from whence TYPE came, if available. */ | |
1094 | ||
1095 | static int | |
1096 | complete_ptr_ref_or_void_ptr_p (type, from) | |
1097 | tree type; | |
1098 | tree from; | |
1099 | { | |
1100 | int is_ptr; | |
1101 | ||
1102 | /* Check complete. */ | |
1103 | type = complete_type_or_else (type, from); | |
1104 | if (!type) | |
1105 | return 0; | |
1106 | ||
1107 | /* Or a pointer or ref to one, or cv void *. */ | |
1108 | is_ptr = TREE_CODE (type) == POINTER_TYPE; | |
1109 | if (is_ptr || TREE_CODE (type) == REFERENCE_TYPE) | |
1110 | { | |
1111 | tree core = TREE_TYPE (type); | |
1112 | ||
1113 | if (is_ptr && same_type_p (TYPE_MAIN_VARIANT (core), void_type_node)) | |
1114 | /* OK */; | |
1115 | else if (!complete_type_or_else (core, from)) | |
1116 | return 0; | |
1117 | } | |
1118 | return 1; | |
1119 | } | |
1120 |