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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 MS |
34 | #include "except.h" |
35 | #include "function.h" | |
0021b564 | 36 | #include "defaults.h" |
54f92bfb | 37 | #include "toplev.h" |
9a0d1e1b | 38 | #include "eh-common.h" |
8d08fdba | 39 | |
49c249e1 | 40 | static void push_eh_cleanup PROTO((void)); |
49c249e1 JM |
41 | static tree build_eh_type_type PROTO((tree)); |
42 | static tree build_eh_type PROTO((tree)); | |
43 | static void expand_end_eh_spec PROTO((tree)); | |
69ac77ce JL |
44 | static tree call_eh_info PROTO((void)); |
45 | static void push_eh_info PROTO((void)); | |
46 | static tree get_eh_info PROTO((void)); | |
47 | static tree get_eh_value PROTO((void)); | |
87603ed0 | 48 | #if 0 |
69ac77ce JL |
49 | static tree get_eh_type PROTO((void)); |
50 | static tree get_eh_caught PROTO((void)); | |
51 | static tree get_eh_handlers PROTO((void)); | |
e833cb11 | 52 | #endif |
69ac77ce | 53 | static tree do_pop_exception PROTO((void)); |
5816cb14 | 54 | static void process_start_catch_block PROTO((tree, tree)); |
5816cb14 | 55 | static tree build_eh_type_type_ref PROTO((tree)); |
c6160f8f JM |
56 | static tree build_terminate_handler PROTO((void)); |
57 | static tree alloc_eh_object PROTO((tree)); | |
4cfbc546 | 58 | static int complete_ptr_ref_or_void_ptr_p PROTO((tree, tree)); |
8d2733ca | 59 | |
8d2733ca | 60 | #if 0 |
e92cc029 | 61 | /* This is the startup, and finish stuff per exception table. */ |
8d08fdba | 62 | |
8d2733ca MS |
63 | /* XXX - Tad: exception handling section */ |
64 | #ifndef EXCEPT_SECTION_ASM_OP | |
65 | #define EXCEPT_SECTION_ASM_OP "section\t.gcc_except_table,\"a\",@progbits" | |
66 | #endif | |
8d08fdba | 67 | |
8d2733ca | 68 | #ifdef EXCEPT_SECTION_ASM_OP |
8d08fdba | 69 | |
8d2733ca MS |
70 | /* on machines which support it, the exception table lives in another section, |
71 | but it needs a label so we can reference it... This sets up that | |
72 | label! */ | |
73 | asm (EXCEPT_SECTION_ASM_OP); | |
74 | exception_table __EXCEPTION_TABLE__[1] = { (void*)0, (void*)0, (void*)0 }; | |
75 | asm (TEXT_SECTION_ASM_OP); | |
8d08fdba | 76 | |
8d2733ca | 77 | #endif /* EXCEPT_SECTION_ASM_OP */ |
8d08fdba | 78 | |
8d2733ca MS |
79 | #ifdef EXCEPT_SECTION_ASM_OP |
80 | ||
81 | /* we need to know where the end of the exception table is... so this | |
82 | is how we do it! */ | |
83 | ||
84 | asm (EXCEPT_SECTION_ASM_OP); | |
85 | exception_table __EXCEPTION_END__[1] = { (void*)-1, (void*)-1, (void*)-1 }; | |
86 | asm (TEXT_SECTION_ASM_OP); | |
87 | ||
88 | #endif /* EXCEPT_SECTION_ASM_OP */ | |
89 | ||
90 | #endif | |
8d08fdba | 91 | |
8d2733ca | 92 | #include "decl.h" |
8d2733ca MS |
93 | #include "insn-flags.h" |
94 | #include "obstack.h" | |
8d2733ca MS |
95 | |
96 | /* ====================================================================== | |
97 | Briefly the algorithm works like this: | |
98 | ||
99 | When a constructor or start of a try block is encountered, | |
100 | push_eh_entry (&eh_stack) is called. Push_eh_entry () creates a | |
101 | new entry in the unwind protection stack and returns a label to | |
102 | output to start the protection for that block. | |
103 | ||
104 | When a destructor or end try block is encountered, pop_eh_entry | |
6467930b MS |
105 | (&eh_stack) is called. Pop_eh_entry () returns the eh_entry it |
106 | created when push_eh_entry () was called. The eh_entry structure | |
8d2733ca MS |
107 | contains three things at this point. The start protect label, |
108 | the end protect label, and the exception handler label. The end | |
109 | protect label should be output before the call to the destructor | |
110 | (if any). If it was a destructor, then its parse tree is stored | |
6467930b | 111 | in the finalization variable in the eh_entry structure. Otherwise |
8d2733ca | 112 | the finalization variable is set to NULL to reflect the fact that |
38e01259 | 113 | it is the end of a try block. Next, this modified eh_entry node |
8d2733ca MS |
114 | is enqueued in the finalizations queue by calling |
115 | enqueue_eh_entry (&queue,entry). | |
116 | ||
117 | +---------------------------------------------------------------+ | |
118 | |XXX: Will need modification to deal with partially | | |
119 | | constructed arrays of objects | | |
120 | | | | |
121 | | Basically, this consists of keeping track of how many | | |
122 | | of the objects have been constructed already (this | | |
123 | | should be in a register though, so that shouldn't be a | | |
124 | | problem. | | |
125 | +---------------------------------------------------------------+ | |
126 | ||
127 | When a catch block is encountered, there is a lot of work to be | |
128 | done. | |
129 | ||
130 | Since we don't want to generate the catch block inline with the | |
131 | regular flow of the function, we need to have some way of doing | |
f30432d7 MS |
132 | so. Luckily, we can use sequences to defer the catch sections. |
133 | When the start of a catch block is encountered, we start the | |
134 | sequence. After the catch block is generated, we end the | |
135 | sequence. | |
136 | ||
8d2733ca MS |
137 | Next we must insure that when the catch block is executed, all |
138 | finalizations for the matching try block have been completed. If | |
139 | any of those finalizations throw an exception, we must call | |
140 | terminate according to the ARM (section r.15.6.1). What this | |
141 | means is that we need to dequeue and emit finalizations for each | |
6467930b | 142 | entry in the eh_queue until we get to an entry with a NULL |
8d2733ca MS |
143 | finalization field. For any of the finalization entries, if it |
144 | is not a call to terminate (), we must protect it by giving it | |
145 | another start label, end label, and exception handler label, | |
146 | setting its finalization tree to be a call to terminate (), and | |
6467930b | 147 | enqueue'ing this new eh_entry to be output at an outer level. |
8d2733ca MS |
148 | Finally, after all that is done, we can get around to outputting |
149 | the catch block which basically wraps all the "catch (...) {...}" | |
150 | statements in a big if/then/else construct that matches the | |
151 | correct block to call. | |
152 | ||
153 | ===================================================================== */ | |
154 | ||
8d2733ca MS |
155 | /* local globals for function calls |
156 | ====================================================================== */ | |
157 | ||
fb98cff6 JM |
158 | /* Used to cache "terminate" and "__throw_type_match*". */ |
159 | static tree Terminate, CatchMatch; | |
8d2733ca | 160 | |
eb66be0e | 161 | /* Used to cache __find_first_exception_table_match for throw. */ |
8d2733ca MS |
162 | static tree FirstExceptionMatch; |
163 | ||
eb66be0e | 164 | /* Used to cache a call to __unwind_function. */ |
8d2733ca MS |
165 | static tree Unwind; |
166 | ||
8d2733ca MS |
167 | /* ====================================================================== */ |
168 | ||
169 | ||
8d2733ca MS |
170 | /* ========================================================================= */ |
171 | ||
8d2733ca MS |
172 | /* sets up all the global eh stuff that needs to be initialized at the |
173 | start of compilation. | |
174 | ||
175 | This includes: | |
6467930b | 176 | - Setting up all the function call trees. */ |
8d08fdba | 177 | |
8d08fdba | 178 | void |
8d2733ca | 179 | init_exception_processing () |
8d08fdba | 180 | { |
6633d636 MS |
181 | /* void vtype () */ |
182 | tree vtype = build_function_type (void_type_node, void_list_node); | |
183 | ||
2c73f9f5 ML |
184 | if (flag_honor_std) |
185 | push_namespace (get_identifier ("std")); | |
fb98cff6 JM |
186 | Terminate = auto_function (get_identifier ("terminate"), |
187 | vtype, NOT_BUILT_IN); | |
188 | TREE_THIS_VOLATILE (Terminate) = 1; | |
2c73f9f5 ML |
189 | if (flag_honor_std) |
190 | pop_namespace (); | |
8ccc31eb | 191 | |
8ccc31eb | 192 | push_lang_context (lang_name_c); |
8d2733ca | 193 | |
9a0d1e1b AM |
194 | set_exception_lang_code (EH_LANG_C_plus_plus); |
195 | set_exception_version_code (1); | |
9a0d1e1b | 196 | |
fb98cff6 | 197 | CatchMatch |
beb53fb8 JM |
198 | = builtin_function (flag_rtti |
199 | ? "__throw_type_match_rtti" | |
200 | : "__throw_type_match", | |
201 | build_function_type (ptr_type_node, | |
6c20b7e9 JM |
202 | tree_cons (NULL_TREE, const_ptr_type_node, |
203 | tree_cons (NULL_TREE, const_ptr_type_node, | |
beb53fb8 JM |
204 | tree_cons (NULL_TREE, ptr_type_node, |
205 | void_list_node)))), | |
206 | NOT_BUILT_IN, NULL_PTR); | |
fb98cff6 | 207 | FirstExceptionMatch |
beb53fb8 JM |
208 | = builtin_function ("__find_first_exception_table_match", |
209 | build_function_type (ptr_type_node, | |
210 | tree_cons (NULL_TREE, ptr_type_node, | |
211 | void_list_node)), | |
212 | NOT_BUILT_IN, NULL_PTR); | |
fb98cff6 | 213 | Unwind |
beb53fb8 JM |
214 | = builtin_function ("__unwind_function", |
215 | build_function_type (void_type_node, | |
216 | tree_cons (NULL_TREE, ptr_type_node, | |
217 | void_list_node)), | |
218 | NOT_BUILT_IN, NULL_PTR); | |
8d2733ca | 219 | |
8d2733ca | 220 | pop_lang_context (); |
f30432d7 | 221 | |
eb66be0e MS |
222 | /* If we use setjmp/longjmp EH, arrange for all cleanup actions to |
223 | be protected with __terminate. */ | |
224 | protect_cleanup_actions_with_terminate = 1; | |
8d2733ca MS |
225 | } |
226 | ||
95e8dcba | 227 | /* Retrieve a pointer to the cp_eh_info node for the current exception. */ |
6874c264 | 228 | |
95e8dcba JM |
229 | static tree |
230 | call_eh_info () | |
6874c264 | 231 | { |
95e8dcba | 232 | tree fn; |
6874c264 | 233 | |
e6cfb550 | 234 | fn = get_identifier ("__start_cp_handler"); |
6874c264 JM |
235 | if (IDENTIFIER_GLOBAL_VALUE (fn)) |
236 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
237 | else | |
238 | { | |
a1622f83 | 239 | tree t1, t, fields[7]; |
6874c264 | 240 | |
e6cfb550 | 241 | /* Declare cp_eh_info * __start_cp_handler (void), |
6874c264 JM |
242 | as defined in exception.cc. */ |
243 | push_obstacks_nochange (); | |
244 | end_temporary_allocation (); | |
245 | ||
246 | /* struct cp_eh_info. This must match exception.cc. Note that this | |
247 | type is not pushed anywhere. */ | |
9a0d1e1b AM |
248 | t1= make_lang_type (RECORD_TYPE); |
249 | fields[0] = build_lang_field_decl (FIELD_DECL, | |
250 | get_identifier ("handler_label"), ptr_type_node); | |
251 | fields[1] = build_lang_field_decl (FIELD_DECL, | |
252 | get_identifier ("dynamic_handler_chain"), ptr_type_node); | |
253 | fields[2] = build_lang_field_decl (FIELD_DECL, | |
254 | get_identifier ("info"), ptr_type_node); | |
e6cfb550 AM |
255 | fields[3] = build_lang_field_decl (FIELD_DECL, |
256 | get_identifier ("table_index"), ptr_type_node); | |
9a0d1e1b AM |
257 | /* N.B.: The fourth field LEN is expected to be |
258 | the number of fields - 1, not the total number of fields. */ | |
e6cfb550 | 259 | finish_builtin_type (t1, "eh_context", fields, 3, ptr_type_node); |
9a0d1e1b AM |
260 | t1 = build_pointer_type (t1); |
261 | ||
262 | t1= make_lang_type (RECORD_TYPE); | |
263 | fields[0] = build_lang_field_decl (FIELD_DECL, | |
264 | get_identifier ("match_function"), ptr_type_node); | |
265 | fields[1] = build_lang_field_decl (FIELD_DECL, | |
9a0d1e1b | 266 | get_identifier ("language"), short_integer_type_node); |
5816cb14 | 267 | fields[2] = build_lang_field_decl (FIELD_DECL, |
9a0d1e1b AM |
268 | get_identifier ("version"), short_integer_type_node); |
269 | /* N.B.: The fourth field LEN is expected to be | |
270 | the number of fields - 1, not the total number of fields. */ | |
5816cb14 | 271 | finish_builtin_type (t1, "__eh_info", fields, 2, ptr_type_node); |
6874c264 | 272 | t = make_lang_type (RECORD_TYPE); |
a1622f83 AM |
273 | fields[0] = build_lang_field_decl (FIELD_DECL, |
274 | get_identifier ("eh_info"), t1); | |
275 | fields[1] = build_lang_field_decl (FIELD_DECL, get_identifier ("value"), | |
6874c264 | 276 | ptr_type_node); |
a1622f83 | 277 | fields[2] = build_lang_field_decl (FIELD_DECL, get_identifier ("type"), |
6874c264 | 278 | ptr_type_node); |
a1622f83 | 279 | fields[3] = build_lang_field_decl |
6874c264 JM |
280 | (FIELD_DECL, get_identifier ("cleanup"), |
281 | build_pointer_type (build_function_type | |
282 | (ptr_type_node, tree_cons | |
283 | (NULL_TREE, ptr_type_node, void_list_node)))); | |
a1622f83 | 284 | fields[4] = build_lang_field_decl (FIELD_DECL, get_identifier ("caught"), |
6874c264 | 285 | boolean_type_node); |
a1622f83 | 286 | fields[5] = build_lang_field_decl (FIELD_DECL, get_identifier ("next"), |
6874c264 | 287 | build_pointer_type (t)); |
a1622f83 | 288 | fields[6] = build_lang_field_decl |
20b90169 | 289 | (FIELD_DECL, get_identifier ("handlers"), long_integer_type_node); |
cf9d67e3 BK |
290 | /* N.B.: The fourth field LEN is expected to be |
291 | the number of fields - 1, not the total number of fields. */ | |
a1622f83 | 292 | finish_builtin_type (t, "cp_eh_info", fields, 6, ptr_type_node); |
6874c264 JM |
293 | t = build_pointer_type (t); |
294 | ||
295 | /* And now the function. */ | |
296 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
297 | build_function_type (t, void_list_node)); | |
298 | DECL_EXTERNAL (fn) = 1; | |
299 | TREE_PUBLIC (fn) = 1; | |
300 | DECL_ARTIFICIAL (fn) = 1; | |
301 | pushdecl_top_level (fn); | |
302 | make_function_rtl (fn); | |
6874c264 JM |
303 | pop_obstacks (); |
304 | } | |
a6ecf8b6 | 305 | mark_used (fn); |
95e8dcba JM |
306 | return build_function_call (fn, NULL_TREE); |
307 | } | |
308 | ||
309 | /* Retrieve a pointer to the cp_eh_info node for the current exception | |
310 | and save it in the current binding level. */ | |
311 | ||
312 | static void | |
313 | push_eh_info () | |
314 | { | |
315 | tree decl, fn = call_eh_info (); | |
6874c264 JM |
316 | |
317 | /* Remember the pointer to the current exception info; it won't change | |
318 | during this catch block. */ | |
319 | decl = build_decl (VAR_DECL, get_identifier ("__exception_info"), | |
320 | TREE_TYPE (fn)); | |
321 | DECL_ARTIFICIAL (decl) = 1; | |
322 | DECL_INITIAL (decl) = fn; | |
323 | decl = pushdecl (decl); | |
324 | cp_finish_decl (decl, fn, NULL_TREE, 0, 0); | |
325 | } | |
326 | ||
327 | /* Returns a reference to the cp_eh_info node for the current exception. */ | |
328 | ||
329 | static tree | |
330 | get_eh_info () | |
331 | { | |
332 | /* Look for the pointer pushed in push_eh_info. */ | |
333 | tree t = lookup_name (get_identifier ("__exception_info"), 0); | |
334 | return build_indirect_ref (t, NULL_PTR); | |
335 | } | |
336 | ||
337 | /* Returns a reference to the current exception object. */ | |
338 | ||
339 | static tree | |
340 | get_eh_value () | |
341 | { | |
342 | return build_component_ref (get_eh_info (), get_identifier ("value"), | |
343 | NULL_TREE, 0); | |
344 | } | |
345 | ||
346 | /* Returns a reference to the current exception type. */ | |
347 | ||
87603ed0 | 348 | #if 0 |
6874c264 JM |
349 | static tree |
350 | get_eh_type () | |
351 | { | |
352 | return build_component_ref (get_eh_info (), get_identifier ("type"), | |
353 | NULL_TREE, 0); | |
354 | } | |
355 | ||
356 | /* Returns a reference to whether or not the current exception | |
357 | has been caught. */ | |
358 | ||
359 | static tree | |
360 | get_eh_caught () | |
361 | { | |
362 | return build_component_ref (get_eh_info (), get_identifier ("caught"), | |
363 | NULL_TREE, 0); | |
364 | } | |
365 | ||
20b90169 JM |
366 | /* Returns a reference to whether or not the current exception |
367 | has been caught. */ | |
368 | ||
369 | static tree | |
370 | get_eh_handlers () | |
371 | { | |
372 | return build_component_ref (get_eh_info (), get_identifier ("handlers"), | |
373 | NULL_TREE, 0); | |
374 | } | |
e833cb11 | 375 | #endif |
20b90169 | 376 | |
f30432d7 MS |
377 | /* Build a type value for use at runtime for a type that is matched |
378 | against by the exception handling system. */ | |
6467930b | 379 | |
f30432d7 MS |
380 | static tree |
381 | build_eh_type_type (type) | |
382 | tree type; | |
8d08fdba | 383 | { |
d8e178a0 | 384 | const char *typestring; |
f30432d7 | 385 | tree exp; |
8d2733ca | 386 | |
f30432d7 MS |
387 | if (type == error_mark_node) |
388 | return error_mark_node; | |
8d2733ca | 389 | |
e92cc029 | 390 | /* peel back references, so they match. */ |
f30432d7 MS |
391 | if (TREE_CODE (type) == REFERENCE_TYPE) |
392 | type = TREE_TYPE (type); | |
8d08fdba | 393 | |
e92cc029 | 394 | /* Peel off cv qualifiers. */ |
f30432d7 | 395 | type = TYPE_MAIN_VARIANT (type); |
8d2733ca | 396 | |
f30432d7 | 397 | if (flag_rtti) |
6a8f78d5 | 398 | return build1 (ADDR_EXPR, ptr_type_node, get_typeid_1 (type)); |
f30432d7 MS |
399 | |
400 | typestring = build_overload_name (type, 1, 1); | |
401 | exp = combine_strings (build_string (strlen (typestring)+1, typestring)); | |
402 | return build1 (ADDR_EXPR, ptr_type_node, exp); | |
8d08fdba | 403 | } |
8d08fdba | 404 | |
5816cb14 AM |
405 | /* Build the address of a runtime type for use in the runtime matching |
406 | field of the new exception model */ | |
407 | ||
408 | static tree | |
409 | build_eh_type_type_ref (type) | |
410 | tree type; | |
411 | { | |
d8e178a0 | 412 | const char *typestring; |
5816cb14 | 413 | tree exp; |
5816cb14 AM |
414 | |
415 | if (type == error_mark_node) | |
416 | return error_mark_node; | |
417 | ||
418 | /* peel back references, so they match. */ | |
419 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
420 | type = TREE_TYPE (type); | |
421 | ||
422 | /* Peel off cv qualifiers. */ | |
423 | type = TYPE_MAIN_VARIANT (type); | |
424 | ||
425 | push_obstacks_nochange (); | |
426 | end_temporary_allocation (); | |
427 | ||
428 | if (flag_rtti) | |
429 | { | |
430 | exp = get_tinfo_fn (type); | |
431 | TREE_USED (exp) = 1; | |
432 | mark_inline_for_output (exp); | |
433 | exp = build1 (ADDR_EXPR, ptr_type_node, exp); | |
434 | } | |
435 | else | |
436 | { | |
437 | typestring = build_overload_name (type, 1, 1); | |
438 | exp = combine_strings (build_string (strlen (typestring)+1, typestring)); | |
439 | exp = build1 (ADDR_EXPR, ptr_type_node, exp); | |
440 | } | |
441 | pop_obstacks (); | |
442 | return (exp); | |
443 | } | |
444 | ||
445 | ||
faae18ab MS |
446 | /* Build a type value for use at runtime for a exp that is thrown or |
447 | matched against by the exception handling system. */ | |
6467930b | 448 | |
faae18ab MS |
449 | static tree |
450 | build_eh_type (exp) | |
451 | tree exp; | |
452 | { | |
faae18ab MS |
453 | if (flag_rtti) |
454 | { | |
455 | exp = build_typeid (exp); | |
456 | return build1 (ADDR_EXPR, ptr_type_node, exp); | |
457 | } | |
f30432d7 | 458 | return build_eh_type_type (TREE_TYPE (exp)); |
faae18ab MS |
459 | } |
460 | ||
9c606f69 AM |
461 | /* This routine is called to mark all the symbols representing runtime |
462 | type functions in the exception table as haveing been referenced. | |
463 | This will make sure code is emitted for them. Called from finish_file. */ | |
464 | void | |
465 | mark_all_runtime_matches () | |
466 | { | |
467 | int x,num; | |
468 | void **ptr; | |
469 | tree exp; | |
470 | ||
471 | num = find_all_handler_type_matches (&ptr); | |
472 | if (num == 0 || ptr == NULL) | |
473 | return; | |
474 | ||
475 | for (x=0; x <num; x++) | |
476 | { | |
477 | exp = (tree) ptr[x]; | |
478 | if (TREE_CODE (exp) == ADDR_EXPR) | |
479 | { | |
480 | exp = TREE_OPERAND (exp, 0); | |
481 | if (TREE_CODE (exp) == FUNCTION_DECL) | |
482 | TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (exp)) = 1; | |
483 | } | |
484 | } | |
485 | ||
486 | free (ptr); | |
487 | } | |
488 | ||
c7ae64f2 JM |
489 | /* Build up a call to __cp_pop_exception, to destroy the exception object |
490 | for the current catch block. HANDLER is either true or false, telling | |
491 | the library whether or not it is being called from an exception handler; | |
492 | if it is, it avoids destroying the object on rethrow. */ | |
6467930b | 493 | |
c7ae64f2 | 494 | static tree |
de35891e | 495 | do_pop_exception () |
72b7eeff | 496 | { |
6874c264 | 497 | tree fn, cleanup; |
6874c264 JM |
498 | fn = get_identifier ("__cp_pop_exception"); |
499 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
500 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
501 | else | |
502 | { | |
c7ae64f2 JM |
503 | /* Declare void __cp_pop_exception (void *), |
504 | as defined in exception.cc. */ | |
6874c264 JM |
505 | push_obstacks_nochange (); |
506 | end_temporary_allocation (); | |
c7ae64f2 JM |
507 | fn = build_lang_decl |
508 | (FUNCTION_DECL, fn, | |
509 | build_function_type (void_type_node, tree_cons | |
de35891e | 510 | (NULL_TREE, ptr_type_node, void_list_node))); |
6874c264 JM |
511 | DECL_EXTERNAL (fn) = 1; |
512 | TREE_PUBLIC (fn) = 1; | |
513 | DECL_ARTIFICIAL (fn) = 1; | |
514 | pushdecl_top_level (fn); | |
515 | make_function_rtl (fn); | |
6874c264 JM |
516 | pop_obstacks (); |
517 | } | |
72b7eeff | 518 | |
a6ecf8b6 | 519 | mark_used (fn); |
72b7eeff | 520 | /* Arrange to do a dynamically scoped cleanup upon exit from this region. */ |
c7ae64f2 JM |
521 | cleanup = lookup_name (get_identifier ("__exception_info"), 0); |
522 | cleanup = build_function_call (fn, expr_tree_cons | |
de35891e | 523 | (NULL_TREE, cleanup, NULL_TREE)); |
c0700ea5 | 524 | return cleanup; |
c7ae64f2 JM |
525 | } |
526 | ||
527 | /* This routine creates the cleanup for the current exception. */ | |
72b7eeff | 528 | |
c7ae64f2 JM |
529 | static void |
530 | push_eh_cleanup () | |
531 | { | |
de35891e | 532 | int yes; |
72b7eeff | 533 | |
de35891e JM |
534 | yes = suspend_momentary (); |
535 | /* All cleanups must last longer than normal. */ | |
536 | expand_decl_cleanup (NULL_TREE, do_pop_exception ()); | |
537 | resume_momentary (yes); | |
c7ae64f2 | 538 | } |
72b7eeff | 539 | |
f4a23343 JM |
540 | /* Build up a call to terminate on the function obstack, for use as an |
541 | exception handler. */ | |
542 | ||
c6160f8f | 543 | static tree |
f4a23343 JM |
544 | build_terminate_handler () |
545 | { | |
546 | int yes = suspend_momentary (); | |
547 | tree term = build_function_call (Terminate, NULL_TREE); | |
548 | resume_momentary (yes); | |
549 | return term; | |
550 | } | |
551 | ||
5816cb14 | 552 | /* Call this to start a catch block. Typename is the typename, and identifier |
8d2733ca MS |
553 | is the variable to place the object in or NULL if the variable doesn't |
554 | matter. If typename is NULL, that means its a "catch (...)" or catch | |
555 | everything. In that case we don't need to do any type checking. | |
556 | (ie: it ends up as the "else" clause rather than an "else if" clause) */ | |
6467930b | 557 | |
8d08fdba | 558 | void |
a4443a08 MS |
559 | expand_start_catch_block (declspecs, declarator) |
560 | tree declspecs, declarator; | |
8d08fdba | 561 | { |
5816cb14 | 562 | tree decl; |
8d2733ca | 563 | |
faf5394a MS |
564 | if (processing_template_decl) |
565 | { | |
566 | if (declspecs) | |
567 | { | |
568 | decl = grokdeclarator (declarator, declspecs, CATCHPARM, | |
569 | 1, NULL_TREE); | |
570 | pushdecl (decl); | |
571 | decl = build_min_nt (DECL_STMT, copy_to_permanent (declarator), | |
572 | copy_to_permanent (declspecs), | |
573 | NULL_TREE); | |
574 | add_tree (decl); | |
575 | } | |
576 | return; | |
577 | } | |
578 | ||
8d2733ca MS |
579 | if (! doing_eh (1)) |
580 | return; | |
581 | ||
bf71cd2e | 582 | process_start_catch_block (declspecs, declarator); |
5816cb14 AM |
583 | } |
584 | ||
585 | ||
5816cb14 AM |
586 | /* This function performs the expand_start_catch_block functionality for |
587 | exceptions implemented in the new style. __throw determines whether | |
588 | a handler needs to be called or not, so the handler itself has to do | |
bf71cd2e | 589 | nothing additional. */ |
5816cb14 AM |
590 | |
591 | static void | |
592 | process_start_catch_block (declspecs, declarator) | |
593 | tree declspecs, declarator; | |
594 | { | |
5816cb14 AM |
595 | tree decl = NULL_TREE; |
596 | tree init; | |
597 | ||
598 | /* Create a binding level for the eh_info and the exception object | |
599 | cleanup. */ | |
600 | pushlevel (0); | |
601 | expand_start_bindings (0); | |
602 | ||
603 | ||
604 | if (declspecs) | |
605 | { | |
606 | decl = grokdeclarator (declarator, declspecs, CATCHPARM, 1, NULL_TREE); | |
607 | ||
608 | if (decl == NULL_TREE) | |
8251199e | 609 | error ("invalid catch parameter"); |
4cfbc546 NS |
610 | else if (!complete_ptr_ref_or_void_ptr_p (TREE_TYPE (decl), NULL_TREE)) |
611 | decl = NULL_TREE; | |
5816cb14 AM |
612 | } |
613 | ||
614 | if (decl) | |
615 | start_catch_handler (build_eh_type_type_ref (TREE_TYPE (decl))); | |
616 | else | |
9c606f69 | 617 | start_catch_handler (CATCH_ALL_TYPE); |
5816cb14 AM |
618 | |
619 | emit_line_note (input_filename, lineno); | |
620 | ||
621 | push_eh_info (); | |
622 | ||
623 | if (decl) | |
624 | { | |
625 | tree exp; | |
5816cb14 AM |
626 | tree init_type; |
627 | ||
628 | /* Make sure we mark the catch param as used, otherwise we'll get | |
629 | a warning about an unused ((anonymous)). */ | |
630 | TREE_USED (decl) = 1; | |
631 | ||
632 | /* Figure out the type that the initializer is. */ | |
633 | init_type = TREE_TYPE (decl); | |
634 | if (TREE_CODE (init_type) != REFERENCE_TYPE | |
635 | && TREE_CODE (init_type) != POINTER_TYPE) | |
636 | init_type = build_reference_type (init_type); | |
637 | ||
638 | exp = get_eh_value (); | |
639 | ||
640 | /* Since pointers are passed by value, initialize a reference to | |
641 | pointer catch parm with the address of the value slot. */ | |
642 | if (TREE_CODE (init_type) == REFERENCE_TYPE | |
643 | && TREE_CODE (TREE_TYPE (init_type)) == POINTER_TYPE) | |
644 | exp = build_unary_op (ADDR_EXPR, exp, 1); | |
645 | ||
646 | exp = ocp_convert (init_type , exp, CONV_IMPLICIT|CONV_FORCE_TEMP, 0); | |
647 | ||
648 | push_eh_cleanup (); | |
649 | ||
650 | /* Create a binding level for the parm. */ | |
651 | pushlevel (0); | |
652 | expand_start_bindings (0); | |
653 | ||
654 | init = convert_from_reference (exp); | |
655 | ||
656 | /* If the constructor for the catch parm exits via an exception, we | |
657 | must call terminate. See eh23.C. */ | |
658 | if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))) | |
659 | { | |
660 | /* Generate the copy constructor call directly so we can wrap it. | |
661 | See also expand_default_init. */ | |
662 | init = ocp_convert (TREE_TYPE (decl), init, | |
663 | CONV_IMPLICIT|CONV_FORCE_TEMP, 0); | |
664 | init = build (TRY_CATCH_EXPR, TREE_TYPE (init), init, | |
665 | build_terminate_handler ()); | |
666 | } | |
667 | ||
668 | /* Let `cp_finish_decl' know that this initializer is ok. */ | |
669 | DECL_INITIAL (decl) = init; | |
670 | decl = pushdecl (decl); | |
671 | ||
bf71cd2e | 672 | start_decl_1 (decl); |
c37dc68e JM |
673 | cp_finish_decl (decl, init, NULL_TREE, 0, |
674 | LOOKUP_ONLYCONVERTING|DIRECT_BIND); | |
5816cb14 AM |
675 | } |
676 | else | |
677 | { | |
678 | push_eh_cleanup (); | |
679 | ||
680 | /* Create a binding level for the parm. */ | |
681 | pushlevel (0); | |
682 | expand_start_bindings (0); | |
683 | ||
684 | /* Fall into the catch all section. */ | |
685 | } | |
686 | ||
5816cb14 AM |
687 | emit_line_note (input_filename, lineno); |
688 | } | |
689 | ||
f30432d7 | 690 | |
8d2733ca MS |
691 | /* Call this to end a catch block. Its responsible for emitting the |
692 | code to handle jumping back to the correct place, and for emitting | |
693 | the label to jump to if this catch block didn't match. */ | |
6467930b | 694 | |
824b9a4c MS |
695 | void |
696 | expand_end_catch_block () | |
8d08fdba | 697 | { |
f30432d7 MS |
698 | if (! doing_eh (1)) |
699 | return; | |
8d2733ca | 700 | |
c7ae64f2 JM |
701 | /* Cleanup the EH parameter. */ |
702 | expand_end_bindings (getdecls (), kept_level_p (), 0); | |
703 | poplevel (kept_level_p (), 1, 0); | |
704 | ||
c7ae64f2 JM |
705 | /* Cleanup the EH object. */ |
706 | expand_end_bindings (getdecls (), kept_level_p (), 0); | |
707 | poplevel (kept_level_p (), 1, 0); | |
eb66be0e | 708 | |
eb66be0e MS |
709 | /* Fall to outside the try statement when done executing handler and |
710 | we fall off end of handler. This is jump Lresume in the | |
711 | documentation. */ | |
712 | expand_goto (top_label_entry (&caught_return_label_stack)); | |
713 | ||
bf71cd2e | 714 | end_catch_handler (); |
8d2733ca | 715 | } |
8d08fdba | 716 | |
6c20b7e9 JM |
717 | /* An exception spec is implemented more or less like: |
718 | ||
719 | try { | |
720 | function body; | |
721 | } catch (...) { | |
722 | void *p[] = { typeid(raises) }; | |
723 | __check_eh_spec (p, count); | |
724 | } | |
725 | ||
726 | __check_eh_spec in exception.cc handles all the details. */ | |
8d2733ca | 727 | |
f30432d7 MS |
728 | void |
729 | expand_start_eh_spec () | |
730 | { | |
6c20b7e9 | 731 | expand_start_try_stmts (); |
f30432d7 MS |
732 | } |
733 | ||
5566b478 | 734 | static void |
f30432d7 MS |
735 | expand_end_eh_spec (raises) |
736 | tree raises; | |
737 | { | |
6c20b7e9 JM |
738 | tree tmp, fn, decl, types = NULL_TREE; |
739 | int count = 0; | |
f30432d7 | 740 | |
6c20b7e9 JM |
741 | expand_start_all_catch (); |
742 | expand_start_catch_block (NULL_TREE, NULL_TREE); | |
f30432d7 | 743 | |
6c20b7e9 JM |
744 | /* Build up an array of type_infos. */ |
745 | for (; raises && TREE_VALUE (raises); raises = TREE_CHAIN (raises)) | |
746 | { | |
747 | types = expr_tree_cons | |
748 | (NULL_TREE, build_eh_type_type (TREE_VALUE (raises)), types); | |
749 | ++count; | |
750 | } | |
eb66be0e | 751 | |
6c20b7e9 JM |
752 | types = build_nt (CONSTRUCTOR, NULL_TREE, types); |
753 | TREE_HAS_CONSTRUCTOR (types) = 1; | |
6874c264 | 754 | |
6c20b7e9 | 755 | /* We can't pass the CONSTRUCTOR directly, so stick it in a variable. */ |
52bf7d5d | 756 | tmp = build_cplus_array_type (const_ptr_type_node, NULL_TREE); |
6c20b7e9 JM |
757 | decl = build_decl (VAR_DECL, NULL_TREE, tmp); |
758 | DECL_ARTIFICIAL (decl) = 1; | |
759 | DECL_INITIAL (decl) = types; | |
760 | cp_finish_decl (decl, types, NULL_TREE, 0, 0); | |
761 | ||
762 | decl = decay_conversion (decl); | |
6874c264 | 763 | |
6c20b7e9 JM |
764 | fn = get_identifier ("__check_eh_spec"); |
765 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
766 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
767 | else | |
f30432d7 | 768 | { |
6c20b7e9 JM |
769 | push_obstacks_nochange (); |
770 | end_temporary_allocation (); | |
f30432d7 | 771 | |
6c20b7e9 JM |
772 | tmp = tree_cons |
773 | (NULL_TREE, integer_type_node, tree_cons | |
774 | (NULL_TREE, TREE_TYPE (decl), void_list_node)); | |
775 | tmp = build_function_type (void_type_node, tmp); | |
f30432d7 | 776 | |
6c20b7e9 JM |
777 | fn = build_lang_decl (FUNCTION_DECL, fn, tmp); |
778 | DECL_EXTERNAL (fn) = 1; | |
779 | TREE_PUBLIC (fn) = 1; | |
780 | DECL_ARTIFICIAL (fn) = 1; | |
781 | TREE_THIS_VOLATILE (fn) = 1; | |
782 | pushdecl_top_level (fn); | |
783 | make_function_rtl (fn); | |
6c20b7e9 JM |
784 | pop_obstacks (); |
785 | } | |
786 | ||
a6ecf8b6 | 787 | mark_used (fn); |
6c20b7e9 JM |
788 | tmp = expr_tree_cons (NULL_TREE, build_int_2 (count, 0), expr_tree_cons |
789 | (NULL_TREE, decl, NULL_TREE)); | |
790 | tmp = build_call (fn, TREE_TYPE (TREE_TYPE (fn)), tmp); | |
791 | expand_expr (tmp, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
792 | ||
793 | expand_end_catch_block (); | |
794 | expand_end_all_catch (); | |
f30432d7 MS |
795 | } |
796 | ||
8d2733ca MS |
797 | /* This is called to expand all the toplevel exception handling |
798 | finalization for a function. It should only be called once per | |
799 | function. */ | |
6467930b | 800 | |
8d08fdba | 801 | void |
8d2733ca | 802 | expand_exception_blocks () |
8d08fdba | 803 | { |
92b96838 | 804 | do_pending_stack_adjust (); |
e00737d2 | 805 | push_to_sequence (catch_clauses); |
8d2733ca | 806 | expand_leftover_cleanups (); |
92b96838 | 807 | do_pending_stack_adjust (); |
e00737d2 | 808 | catch_clauses = get_insns (); |
f30432d7 | 809 | end_sequence (); |
eb448459 | 810 | |
eb448459 MS |
811 | /* Do this after we expand leftover cleanups, so that the |
812 | expand_eh_region_end that expand_end_eh_spec does will match the | |
813 | right expand_eh_region_start, and make sure it comes out before | |
814 | the terminate protected region. */ | |
f30432d7 MS |
815 | if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl))) |
816 | { | |
eb448459 | 817 | expand_end_eh_spec (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl))); |
92b96838 | 818 | do_pending_stack_adjust (); |
e00737d2 | 819 | push_to_sequence (catch_clauses); |
eb448459 | 820 | expand_leftover_cleanups (); |
92b96838 | 821 | do_pending_stack_adjust (); |
e00737d2 | 822 | catch_clauses = get_insns (); |
eb448459 | 823 | end_sequence (); |
f30432d7 MS |
824 | } |
825 | ||
e00737d2 | 826 | if (catch_clauses) |
f30432d7 | 827 | { |
e00737d2 MS |
828 | rtx funcend = gen_label_rtx (); |
829 | emit_jump (funcend); | |
830 | ||
eb66be0e MS |
831 | /* We cannot protect n regions this way if we must flow into the |
832 | EH region through the top of the region, as we have to with | |
833 | the setjmp/longjmp approach. */ | |
834 | if (exceptions_via_longjmp == 0) | |
fb98cff6 | 835 | expand_eh_region_start (); |
f30432d7 | 836 | |
e00737d2 MS |
837 | emit_insns (catch_clauses); |
838 | catch_clauses = NULL_RTX; | |
eb66be0e MS |
839 | |
840 | if (exceptions_via_longjmp == 0) | |
f4a23343 | 841 | expand_eh_region_end (build_terminate_handler ()); |
eb66be0e | 842 | |
6467930b | 843 | expand_leftover_cleanups (); |
f30432d7 | 844 | |
e00737d2 MS |
845 | emit_label (funcend); |
846 | } | |
8d08fdba MS |
847 | } |
848 | ||
72b7eeff MS |
849 | tree |
850 | start_anon_func () | |
851 | { | |
852 | static int counter = 0; | |
e92cc029 | 853 | int old_interface_unknown = interface_unknown; |
72b7eeff MS |
854 | char name[32]; |
855 | tree params; | |
856 | tree t; | |
857 | ||
858 | push_cp_function_context (NULL_TREE); | |
859 | push_to_top_level (); | |
860 | ||
861 | /* No need to mangle this. */ | |
862 | push_lang_context (lang_name_c); | |
863 | ||
e92cc029 MS |
864 | interface_unknown = 1; |
865 | ||
72b7eeff | 866 | params = void_list_node; |
956d6950 | 867 | /* tcf stands for throw clean function. */ |
72b7eeff | 868 | sprintf (name, "__tcf_%d", counter++); |
c11b6f21 MS |
869 | t = make_call_declarator (get_identifier (name), params, NULL_TREE, |
870 | NULL_TREE); | |
72b7eeff MS |
871 | start_function (decl_tree_cons (NULL_TREE, get_identifier ("static"), |
872 | void_list_node), | |
c11b6f21 | 873 | t, NULL_TREE, 0); |
72b7eeff MS |
874 | store_parm_decls (); |
875 | pushlevel (0); | |
876 | clear_last_expr (); | |
877 | push_momentary (); | |
878 | expand_start_bindings (0); | |
879 | emit_line_note (input_filename, lineno); | |
880 | ||
e92cc029 MS |
881 | interface_unknown = old_interface_unknown; |
882 | ||
72b7eeff MS |
883 | pop_lang_context (); |
884 | ||
885 | return current_function_decl; | |
886 | } | |
887 | ||
888 | void | |
889 | end_anon_func () | |
890 | { | |
fc378698 | 891 | expand_end_bindings (getdecls (), 1, 0); |
72b7eeff MS |
892 | poplevel (1, 0, 0); |
893 | pop_momentary (); | |
894 | ||
895 | finish_function (lineno, 0, 0); | |
896 | ||
897 | pop_from_top_level (); | |
898 | pop_cp_function_context (NULL_TREE); | |
899 | } | |
8d2733ca | 900 | |
f4a23343 JM |
901 | /* Return a pointer to a buffer for an exception object of type TYPE. */ |
902 | ||
c6160f8f | 903 | static tree |
f4a23343 JM |
904 | alloc_eh_object (type) |
905 | tree type; | |
906 | { | |
907 | tree fn, exp; | |
908 | ||
909 | fn = get_identifier ("__eh_alloc"); | |
910 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
911 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
912 | else | |
913 | { | |
914 | /* Declare __eh_alloc (size_t), as defined in exception.cc. */ | |
915 | tree tmp; | |
916 | push_obstacks_nochange (); | |
917 | end_temporary_allocation (); | |
918 | tmp = tree_cons (NULL_TREE, sizetype, void_list_node); | |
919 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
920 | build_function_type (ptr_type_node, tmp)); | |
921 | DECL_EXTERNAL (fn) = 1; | |
922 | TREE_PUBLIC (fn) = 1; | |
923 | DECL_ARTIFICIAL (fn) = 1; | |
924 | pushdecl_top_level (fn); | |
925 | make_function_rtl (fn); | |
f4a23343 JM |
926 | pop_obstacks (); |
927 | } | |
928 | ||
a6ecf8b6 | 929 | mark_used (fn); |
f4a23343 JM |
930 | exp = build_function_call (fn, expr_tree_cons |
931 | (NULL_TREE, size_in_bytes (type), NULL_TREE)); | |
932 | exp = build1 (NOP_EXPR, build_pointer_type (type), exp); | |
933 | return exp; | |
934 | } | |
935 | ||
6467930b | 936 | /* Expand a throw statement. This follows the following |
8d2733ca MS |
937 | algorithm: |
938 | ||
939 | 1. Allocate space to save the current PC onto the stack. | |
940 | 2. Generate and emit a label and save its address into the | |
e1cd6e56 | 941 | newly allocated stack space since we can't save the pc directly. |
8d2733ca MS |
942 | 3. If this is the first call to throw in this function: |
943 | generate a label for the throw block | |
944 | 4. jump to the throw block label. */ | |
6467930b | 945 | |
8d08fdba | 946 | void |
8d2733ca MS |
947 | expand_throw (exp) |
948 | tree exp; | |
8d08fdba | 949 | { |
6874c264 JM |
950 | tree fn; |
951 | static tree cleanup_type; | |
8d08fdba | 952 | |
8d2733ca MS |
953 | if (! doing_eh (1)) |
954 | return; | |
8d08fdba | 955 | |
8d2733ca MS |
956 | if (exp) |
957 | { | |
faae18ab | 958 | tree throw_type; |
6874c264 | 959 | tree cleanup = NULL_TREE, e; |
faae18ab | 960 | |
a3b49ccd | 961 | /* throw expression */ |
e92cc029 | 962 | /* First, decay it. */ |
f30432d7 | 963 | exp = decay_conversion (exp); |
a3b49ccd | 964 | |
6874c264 JM |
965 | /* cleanup_type is void (*)(void *, int), |
966 | the internal type of a destructor. */ | |
967 | if (cleanup_type == NULL_TREE) | |
968 | { | |
969 | push_obstacks_nochange (); | |
970 | end_temporary_allocation (); | |
971 | cleanup_type = build_pointer_type | |
972 | (build_function_type | |
973 | (void_type_node, tree_cons | |
974 | (NULL_TREE, ptr_type_node, tree_cons | |
975 | (NULL_TREE, integer_type_node, void_list_node)))); | |
976 | pop_obstacks (); | |
977 | } | |
978 | ||
08b24bda | 979 | if (TYPE_PTR_P (TREE_TYPE (exp))) |
bbeeb2b0 | 980 | throw_type = build_eh_type (exp); |
f30432d7 MS |
981 | else |
982 | { | |
f4a23343 JM |
983 | tree object, ptr; |
984 | ||
985 | /* OK, this is kind of wacky. The WP says that we call | |
986 | terminate | |
987 | ||
988 | when the exception handling mechanism, after completing | |
989 | evaluation of the expression to be thrown but before the | |
990 | exception is caught (_except.throw_), calls a user function | |
991 | that exits via an uncaught exception. | |
992 | ||
993 | So we have to protect the actual initialization of the | |
994 | exception object with terminate(), but evaluate the expression | |
995 | first. We also expand the call to __eh_alloc | |
996 | first. Since there could be temps in the expression, we need | |
997 | to handle that, too. */ | |
a50f0918 | 998 | |
f4a23343 JM |
999 | expand_start_target_temps (); |
1000 | ||
1001 | #if 0 | |
1002 | /* Unfortunately, this doesn't work. */ | |
1003 | preexpand_calls (exp); | |
1004 | #else | |
1005 | /* Store the throw expression into a temp. This can be less | |
1006 | efficient than storing it into the allocated space directly, but | |
1007 | oh well. To do this efficiently we would need to insinuate | |
1008 | ourselves into expand_call. */ | |
1009 | if (TREE_SIDE_EFFECTS (exp)) | |
1010 | { | |
c37dc68e | 1011 | tree temp = build_decl (VAR_DECL, NULL_TREE, TREE_TYPE (exp)); |
f4a23343 | 1012 | DECL_ARTIFICIAL (temp) = 1; |
f4a23343 | 1013 | DECL_RTL (temp) = assign_temp (TREE_TYPE (exp), 2, 0, 1); |
c37dc68e JM |
1014 | DECL_INITIAL (temp) = exp; |
1015 | cp_finish_decl (temp, exp, NULL_TREE, 0, LOOKUP_ONLYCONVERTING); | |
f4a23343 JM |
1016 | exp = temp; |
1017 | } | |
1018 | #endif | |
1019 | ||
1020 | /* Allocate the space for the exception. */ | |
1021 | ptr = save_expr (alloc_eh_object (TREE_TYPE (exp))); | |
1022 | expand_expr (ptr, const0_rtx, VOIDmode, 0); | |
1023 | ||
1024 | expand_eh_region_start (); | |
1025 | ||
1026 | object = build_indirect_ref (ptr, NULL_PTR); | |
1027 | exp = build_modify_expr (object, INIT_EXPR, exp); | |
faae18ab | 1028 | |
f30432d7 | 1029 | if (exp == error_mark_node) |
8251199e | 1030 | error (" in thrown expression"); |
faae18ab | 1031 | |
f4a23343 JM |
1032 | expand_expr (exp, const0_rtx, VOIDmode, 0); |
1033 | expand_eh_region_end (build_terminate_handler ()); | |
1034 | expand_end_target_temps (); | |
1035 | ||
72b7eeff MS |
1036 | throw_type = build_eh_type (object); |
1037 | ||
6874c264 JM |
1038 | if (TYPE_HAS_DESTRUCTOR (TREE_TYPE (object))) |
1039 | { | |
1040 | cleanup = lookup_fnfields (TYPE_BINFO (TREE_TYPE (object)), | |
1041 | dtor_identifier, 0); | |
1042 | cleanup = TREE_VALUE (cleanup); | |
e872bb7a | 1043 | mark_used (cleanup); |
6874c264 JM |
1044 | mark_addressable (cleanup); |
1045 | /* Pretend it's a normal function. */ | |
1046 | cleanup = build1 (ADDR_EXPR, cleanup_type, cleanup); | |
1047 | } | |
f4a23343 JM |
1048 | |
1049 | exp = ptr; | |
f30432d7 | 1050 | } |
faae18ab | 1051 | |
bbeeb2b0 MM |
1052 | /* Cast EXP to `void *' so that it will match the prototype for |
1053 | __cp_push_exception. */ | |
c37dc68e | 1054 | exp = convert (ptr_type_node, exp); |
bbeeb2b0 | 1055 | |
6874c264 JM |
1056 | if (cleanup == NULL_TREE) |
1057 | { | |
1058 | cleanup = build_int_2 (0, 0); | |
1059 | TREE_TYPE (cleanup) = cleanup_type; | |
1060 | } | |
72b7eeff | 1061 | |
6874c264 JM |
1062 | fn = get_identifier ("__cp_push_exception"); |
1063 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
1064 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
1065 | else | |
1066 | { | |
1067 | /* Declare __cp_push_exception (void*, void*, void (*)(void*, int)), | |
1068 | as defined in exception.cc. */ | |
1069 | tree tmp; | |
1070 | push_obstacks_nochange (); | |
1071 | end_temporary_allocation (); | |
1072 | tmp = tree_cons | |
1073 | (NULL_TREE, ptr_type_node, tree_cons | |
1074 | (NULL_TREE, ptr_type_node, tree_cons | |
1075 | (NULL_TREE, cleanup_type, void_list_node))); | |
1076 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
1077 | build_function_type (void_type_node, tmp)); | |
1078 | DECL_EXTERNAL (fn) = 1; | |
1079 | TREE_PUBLIC (fn) = 1; | |
1080 | DECL_ARTIFICIAL (fn) = 1; | |
1081 | pushdecl_top_level (fn); | |
1082 | make_function_rtl (fn); | |
6874c264 JM |
1083 | pop_obstacks (); |
1084 | } | |
72b7eeff | 1085 | |
a6ecf8b6 | 1086 | mark_used (fn); |
6874c264 JM |
1087 | e = expr_tree_cons (NULL_TREE, exp, expr_tree_cons |
1088 | (NULL_TREE, throw_type, expr_tree_cons | |
1089 | (NULL_TREE, cleanup, NULL_TREE))); | |
1090 | e = build_function_call (fn, e); | |
1091 | expand_expr (e, const0_rtx, VOIDmode, 0); | |
8d2733ca MS |
1092 | } |
1093 | else | |
a3b49ccd | 1094 | { |
6874c264 JM |
1095 | /* rethrow current exception; note that it's no longer caught. */ |
1096 | ||
1097 | tree fn = get_identifier ("__uncatch_exception"); | |
1098 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
1099 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
1100 | else | |
1101 | { | |
1102 | /* Declare void __uncatch_exception (void) | |
1103 | as defined in exception.cc. */ | |
1104 | push_obstacks_nochange (); | |
1105 | end_temporary_allocation (); | |
1106 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
1107 | build_function_type (void_type_node, | |
1108 | void_list_node)); | |
1109 | DECL_EXTERNAL (fn) = 1; | |
1110 | TREE_PUBLIC (fn) = 1; | |
1111 | DECL_ARTIFICIAL (fn) = 1; | |
1112 | pushdecl_top_level (fn); | |
1113 | make_function_rtl (fn); | |
6874c264 JM |
1114 | pop_obstacks (); |
1115 | } | |
1116 | ||
a6ecf8b6 | 1117 | mark_used (fn); |
6874c264 JM |
1118 | exp = build_function_call (fn, NULL_TREE); |
1119 | expand_expr (exp, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
a3b49ccd | 1120 | } |
8d2733ca | 1121 | |
e701eb4d | 1122 | expand_internal_throw (); |
f376e137 | 1123 | } |
8d2733ca MS |
1124 | |
1125 | /* Build a throw expression. */ | |
6467930b | 1126 | |
8d2733ca MS |
1127 | tree |
1128 | build_throw (e) | |
1129 | tree e; | |
1130 | { | |
02020185 JM |
1131 | if (e == error_mark_node) |
1132 | return e; | |
1133 | ||
1134 | if (processing_template_decl) | |
1135 | return build_min (THROW_EXPR, void_type_node, e); | |
1136 | ||
e0f9a8bc | 1137 | if (e == null_node) |
8251199e | 1138 | cp_warning ("throwing NULL, which has integral, not pointer type"); |
980c394c NS |
1139 | |
1140 | if (e != NULL_TREE) | |
1141 | { | |
4cfbc546 NS |
1142 | if (!complete_ptr_ref_or_void_ptr_p (TREE_TYPE (e), e)) |
1143 | return error_mark_node; | |
980c394c | 1144 | } |
02020185 JM |
1145 | |
1146 | e = build1 (THROW_EXPR, void_type_node, e); | |
1147 | TREE_SIDE_EFFECTS (e) = 1; | |
1148 | TREE_USED (e) = 1; | |
1149 | ||
8d2733ca | 1150 | return e; |
8d08fdba | 1151 | } |
4cfbc546 NS |
1152 | |
1153 | /* Make sure TYPE is complete, pointer to complete, reference to | |
1154 | complete, or pointer to cv void. Issue diagnostic on failure. | |
1155 | Return the zero on failure and non-zero on success. FROM can be | |
1156 | the expr or decl from whence TYPE came, if available. */ | |
1157 | ||
1158 | static int | |
1159 | complete_ptr_ref_or_void_ptr_p (type, from) | |
1160 | tree type; | |
1161 | tree from; | |
1162 | { | |
1163 | int is_ptr; | |
1164 | ||
1165 | /* Check complete. */ | |
1166 | type = complete_type_or_else (type, from); | |
1167 | if (!type) | |
1168 | return 0; | |
1169 | ||
1170 | /* Or a pointer or ref to one, or cv void *. */ | |
1171 | is_ptr = TREE_CODE (type) == POINTER_TYPE; | |
1172 | if (is_ptr || TREE_CODE (type) == REFERENCE_TYPE) | |
1173 | { | |
1174 | tree core = TREE_TYPE (type); | |
1175 | ||
1176 | if (is_ptr && same_type_p (TYPE_MAIN_VARIANT (core), void_type_node)) | |
1177 | /* OK */; | |
1178 | else if (!complete_type_or_else (core, from)) | |
1179 | return 0; | |
1180 | } | |
1181 | return 1; | |
1182 | } | |
1183 |