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8d08fdba | 1 | /* Handle exceptional things in C++. |
956d6950 | 2 | Copyright (C) 1989, 92-96, 1997 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" |
da20811c | 26 | #include <stdio.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" |
8d08fdba | 37 | |
f30432d7 | 38 | rtx expand_builtin_return_addr PROTO((enum built_in_function, int, rtx)); |
a3b49ccd | 39 | |
eb66be0e | 40 | /* Holds the fndecl for __builtin_return_address. */ |
8d2733ca | 41 | tree builtin_return_address_fndecl; |
8d2733ca MS |
42 | |
43 | /* A couple of backend routines from m88k.c */ | |
44 | ||
49c249e1 | 45 | static void push_eh_cleanup PROTO((void)); |
49c249e1 JM |
46 | static rtx do_function_call PROTO((tree, tree, tree)); |
47 | static tree build_eh_type_type PROTO((tree)); | |
48 | static tree build_eh_type PROTO((tree)); | |
49 | static void expand_end_eh_spec PROTO((tree)); | |
8d2733ca | 50 | |
8d2733ca | 51 | #if 0 |
e92cc029 | 52 | /* This is the startup, and finish stuff per exception table. */ |
8d08fdba | 53 | |
8d2733ca MS |
54 | /* XXX - Tad: exception handling section */ |
55 | #ifndef EXCEPT_SECTION_ASM_OP | |
56 | #define EXCEPT_SECTION_ASM_OP "section\t.gcc_except_table,\"a\",@progbits" | |
57 | #endif | |
8d08fdba | 58 | |
8d2733ca MS |
59 | #ifdef EXCEPT_SECTION_ASM_OP |
60 | typedef struct { | |
6467930b MS |
61 | void *start_region; |
62 | void *end_region; | |
8d2733ca MS |
63 | void *exception_handler; |
64 | } exception_table; | |
65 | #endif /* EXCEPT_SECTION_ASM_OP */ | |
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 |
6467930b | 112 | is the 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 | /* local globals for function calls |
155 | ====================================================================== */ | |
156 | ||
fb98cff6 JM |
157 | /* Used to cache "terminate" and "__throw_type_match*". */ |
158 | static tree Terminate, CatchMatch; | |
8d2733ca | 159 | |
eb66be0e | 160 | /* Used to cache __find_first_exception_table_match for throw. */ |
8d2733ca MS |
161 | static tree FirstExceptionMatch; |
162 | ||
eb66be0e | 163 | /* Used to cache a call to __unwind_function. */ |
8d2733ca MS |
164 | static tree Unwind; |
165 | ||
8d2733ca MS |
166 | /* ====================================================================== */ |
167 | ||
168 | ||
8d2733ca MS |
169 | /* ========================================================================= */ |
170 | ||
171 | ||
172 | ||
173 | /* local globals - these local globals are for storing data necessary for | |
174 | generating the exception table and code in the correct order. | |
175 | ||
176 | ========================================================================= */ | |
177 | ||
6467930b | 178 | extern rtx catch_clauses; |
6c20b7e9 | 179 | extern tree const_ptr_type_node; |
8d2733ca | 180 | |
8d2733ca MS |
181 | /* ========================================================================= */ |
182 | ||
6467930b | 183 | /* Cheesyness to save some typing. Returns the return value rtx. */ |
8d2733ca | 184 | |
5566b478 | 185 | static rtx |
f30432d7 MS |
186 | do_function_call (func, params, return_type) |
187 | tree func, params, return_type; | |
188 | { | |
189 | tree func_call; | |
190 | func_call = build_function_call (func, params); | |
191 | expand_call (func_call, NULL_RTX, 0); | |
192 | if (return_type != NULL_TREE) | |
193 | return hard_function_value (return_type, func_call); | |
194 | return NULL_RTX; | |
195 | } | |
196 | ||
8d2733ca MS |
197 | /* ========================================================================= */ |
198 | ||
8d2733ca MS |
199 | /* sets up all the global eh stuff that needs to be initialized at the |
200 | start of compilation. | |
201 | ||
202 | This includes: | |
6467930b | 203 | - Setting up all the function call trees. */ |
8d08fdba | 204 | |
8d08fdba | 205 | void |
8d2733ca | 206 | init_exception_processing () |
8d08fdba | 207 | { |
6633d636 MS |
208 | /* void vtype () */ |
209 | tree vtype = build_function_type (void_type_node, void_list_node); | |
210 | ||
fb98cff6 JM |
211 | Terminate = auto_function (get_identifier ("terminate"), |
212 | vtype, NOT_BUILT_IN); | |
213 | TREE_THIS_VOLATILE (Terminate) = 1; | |
8ccc31eb | 214 | |
8ccc31eb | 215 | push_lang_context (lang_name_c); |
8d2733ca | 216 | |
fb98cff6 | 217 | CatchMatch |
beb53fb8 JM |
218 | = builtin_function (flag_rtti |
219 | ? "__throw_type_match_rtti" | |
220 | : "__throw_type_match", | |
221 | build_function_type (ptr_type_node, | |
6c20b7e9 JM |
222 | tree_cons (NULL_TREE, const_ptr_type_node, |
223 | tree_cons (NULL_TREE, const_ptr_type_node, | |
beb53fb8 JM |
224 | tree_cons (NULL_TREE, ptr_type_node, |
225 | void_list_node)))), | |
226 | NOT_BUILT_IN, NULL_PTR); | |
fb98cff6 | 227 | FirstExceptionMatch |
beb53fb8 JM |
228 | = builtin_function ("__find_first_exception_table_match", |
229 | build_function_type (ptr_type_node, | |
230 | tree_cons (NULL_TREE, ptr_type_node, | |
231 | void_list_node)), | |
232 | NOT_BUILT_IN, NULL_PTR); | |
fb98cff6 | 233 | Unwind |
beb53fb8 JM |
234 | = builtin_function ("__unwind_function", |
235 | build_function_type (void_type_node, | |
236 | tree_cons (NULL_TREE, ptr_type_node, | |
237 | void_list_node)), | |
238 | NOT_BUILT_IN, NULL_PTR); | |
8d2733ca | 239 | |
8d2733ca | 240 | pop_lang_context (); |
f30432d7 | 241 | |
eb66be0e MS |
242 | /* If we use setjmp/longjmp EH, arrange for all cleanup actions to |
243 | be protected with __terminate. */ | |
244 | protect_cleanup_actions_with_terminate = 1; | |
8d2733ca MS |
245 | } |
246 | ||
95e8dcba | 247 | /* Retrieve a pointer to the cp_eh_info node for the current exception. */ |
6874c264 | 248 | |
95e8dcba JM |
249 | static tree |
250 | call_eh_info () | |
6874c264 | 251 | { |
95e8dcba | 252 | tree fn; |
6874c264 JM |
253 | |
254 | fn = get_identifier ("__cp_exception_info"); | |
255 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
256 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
257 | else | |
258 | { | |
20b90169 | 259 | tree t, fields[6]; |
6874c264 JM |
260 | |
261 | /* Declare cp_eh_info * __cp_exception_info (void), | |
262 | as defined in exception.cc. */ | |
263 | push_obstacks_nochange (); | |
264 | end_temporary_allocation (); | |
265 | ||
266 | /* struct cp_eh_info. This must match exception.cc. Note that this | |
267 | type is not pushed anywhere. */ | |
268 | t = make_lang_type (RECORD_TYPE); | |
269 | fields[0] = build_lang_field_decl (FIELD_DECL, get_identifier ("value"), | |
270 | ptr_type_node); | |
271 | fields[1] = build_lang_field_decl (FIELD_DECL, get_identifier ("type"), | |
272 | ptr_type_node); | |
273 | fields[2] = build_lang_field_decl | |
274 | (FIELD_DECL, get_identifier ("cleanup"), | |
275 | build_pointer_type (build_function_type | |
276 | (ptr_type_node, tree_cons | |
277 | (NULL_TREE, ptr_type_node, void_list_node)))); | |
278 | fields[3] = build_lang_field_decl (FIELD_DECL, get_identifier ("caught"), | |
279 | boolean_type_node); | |
280 | fields[4] = build_lang_field_decl (FIELD_DECL, get_identifier ("next"), | |
281 | build_pointer_type (t)); | |
20b90169 JM |
282 | fields[5] = build_lang_field_decl |
283 | (FIELD_DECL, get_identifier ("handlers"), long_integer_type_node); | |
cf9d67e3 BK |
284 | /* N.B.: The fourth field LEN is expected to be |
285 | the number of fields - 1, not the total number of fields. */ | |
20b90169 | 286 | finish_builtin_type (t, "cp_eh_info", fields, 5, ptr_type_node); |
6874c264 JM |
287 | t = build_pointer_type (t); |
288 | ||
289 | /* And now the function. */ | |
290 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
291 | build_function_type (t, void_list_node)); | |
292 | DECL_EXTERNAL (fn) = 1; | |
293 | TREE_PUBLIC (fn) = 1; | |
294 | DECL_ARTIFICIAL (fn) = 1; | |
295 | pushdecl_top_level (fn); | |
296 | make_function_rtl (fn); | |
297 | assemble_external (fn); | |
298 | pop_obstacks (); | |
299 | } | |
95e8dcba JM |
300 | return build_function_call (fn, NULL_TREE); |
301 | } | |
302 | ||
303 | /* Retrieve a pointer to the cp_eh_info node for the current exception | |
304 | and save it in the current binding level. */ | |
305 | ||
306 | static void | |
307 | push_eh_info () | |
308 | { | |
309 | tree decl, fn = call_eh_info (); | |
6874c264 JM |
310 | |
311 | /* Remember the pointer to the current exception info; it won't change | |
312 | during this catch block. */ | |
313 | decl = build_decl (VAR_DECL, get_identifier ("__exception_info"), | |
314 | TREE_TYPE (fn)); | |
315 | DECL_ARTIFICIAL (decl) = 1; | |
316 | DECL_INITIAL (decl) = fn; | |
317 | decl = pushdecl (decl); | |
318 | cp_finish_decl (decl, fn, NULL_TREE, 0, 0); | |
319 | } | |
320 | ||
321 | /* Returns a reference to the cp_eh_info node for the current exception. */ | |
322 | ||
323 | static tree | |
324 | get_eh_info () | |
325 | { | |
326 | /* Look for the pointer pushed in push_eh_info. */ | |
327 | tree t = lookup_name (get_identifier ("__exception_info"), 0); | |
328 | return build_indirect_ref (t, NULL_PTR); | |
329 | } | |
330 | ||
331 | /* Returns a reference to the current exception object. */ | |
332 | ||
333 | static tree | |
334 | get_eh_value () | |
335 | { | |
336 | return build_component_ref (get_eh_info (), get_identifier ("value"), | |
337 | NULL_TREE, 0); | |
338 | } | |
339 | ||
340 | /* Returns a reference to the current exception type. */ | |
341 | ||
342 | static tree | |
343 | get_eh_type () | |
344 | { | |
345 | return build_component_ref (get_eh_info (), get_identifier ("type"), | |
346 | NULL_TREE, 0); | |
347 | } | |
348 | ||
349 | /* Returns a reference to whether or not the current exception | |
350 | has been caught. */ | |
351 | ||
352 | static tree | |
353 | get_eh_caught () | |
354 | { | |
355 | return build_component_ref (get_eh_info (), get_identifier ("caught"), | |
356 | NULL_TREE, 0); | |
357 | } | |
358 | ||
20b90169 JM |
359 | /* Returns a reference to whether or not the current exception |
360 | has been caught. */ | |
361 | ||
362 | static tree | |
363 | get_eh_handlers () | |
364 | { | |
365 | return build_component_ref (get_eh_info (), get_identifier ("handlers"), | |
366 | NULL_TREE, 0); | |
367 | } | |
368 | ||
f30432d7 MS |
369 | /* Build a type value for use at runtime for a type that is matched |
370 | against by the exception handling system. */ | |
6467930b | 371 | |
f30432d7 MS |
372 | static tree |
373 | build_eh_type_type (type) | |
374 | tree type; | |
8d08fdba | 375 | { |
f30432d7 MS |
376 | char *typestring; |
377 | tree exp; | |
8d2733ca | 378 | |
f30432d7 MS |
379 | if (type == error_mark_node) |
380 | return error_mark_node; | |
8d2733ca | 381 | |
e92cc029 | 382 | /* peel back references, so they match. */ |
f30432d7 MS |
383 | if (TREE_CODE (type) == REFERENCE_TYPE) |
384 | type = TREE_TYPE (type); | |
8d08fdba | 385 | |
e92cc029 | 386 | /* Peel off cv qualifiers. */ |
f30432d7 | 387 | type = TYPE_MAIN_VARIANT (type); |
8d2733ca | 388 | |
f30432d7 | 389 | if (flag_rtti) |
8d08fdba | 390 | { |
f30432d7 | 391 | return build1 (ADDR_EXPR, ptr_type_node, get_typeid (type)); |
8d08fdba | 392 | } |
f30432d7 MS |
393 | |
394 | typestring = build_overload_name (type, 1, 1); | |
395 | exp = combine_strings (build_string (strlen (typestring)+1, typestring)); | |
396 | return build1 (ADDR_EXPR, ptr_type_node, exp); | |
8d08fdba | 397 | } |
8d08fdba | 398 | |
faae18ab MS |
399 | /* Build a type value for use at runtime for a exp that is thrown or |
400 | matched against by the exception handling system. */ | |
6467930b | 401 | |
faae18ab MS |
402 | static tree |
403 | build_eh_type (exp) | |
404 | tree exp; | |
405 | { | |
faae18ab MS |
406 | if (flag_rtti) |
407 | { | |
408 | exp = build_typeid (exp); | |
409 | return build1 (ADDR_EXPR, ptr_type_node, exp); | |
410 | } | |
f30432d7 | 411 | return build_eh_type_type (TREE_TYPE (exp)); |
faae18ab MS |
412 | } |
413 | ||
c7ae64f2 JM |
414 | /* Build up a call to __cp_pop_exception, to destroy the exception object |
415 | for the current catch block. HANDLER is either true or false, telling | |
416 | the library whether or not it is being called from an exception handler; | |
417 | if it is, it avoids destroying the object on rethrow. */ | |
6467930b | 418 | |
c7ae64f2 | 419 | static tree |
de35891e | 420 | do_pop_exception () |
72b7eeff | 421 | { |
6874c264 | 422 | tree fn, cleanup; |
6874c264 JM |
423 | fn = get_identifier ("__cp_pop_exception"); |
424 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
425 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
426 | else | |
427 | { | |
c7ae64f2 JM |
428 | /* Declare void __cp_pop_exception (void *), |
429 | as defined in exception.cc. */ | |
6874c264 JM |
430 | push_obstacks_nochange (); |
431 | end_temporary_allocation (); | |
c7ae64f2 JM |
432 | fn = build_lang_decl |
433 | (FUNCTION_DECL, fn, | |
434 | build_function_type (void_type_node, tree_cons | |
de35891e | 435 | (NULL_TREE, ptr_type_node, void_list_node))); |
6874c264 JM |
436 | DECL_EXTERNAL (fn) = 1; |
437 | TREE_PUBLIC (fn) = 1; | |
438 | DECL_ARTIFICIAL (fn) = 1; | |
439 | pushdecl_top_level (fn); | |
440 | make_function_rtl (fn); | |
441 | assemble_external (fn); | |
442 | pop_obstacks (); | |
443 | } | |
72b7eeff MS |
444 | |
445 | /* Arrange to do a dynamically scoped cleanup upon exit from this region. */ | |
c7ae64f2 JM |
446 | cleanup = lookup_name (get_identifier ("__exception_info"), 0); |
447 | cleanup = build_function_call (fn, expr_tree_cons | |
de35891e | 448 | (NULL_TREE, cleanup, NULL_TREE)); |
c0700ea5 | 449 | return cleanup; |
c7ae64f2 JM |
450 | } |
451 | ||
452 | /* This routine creates the cleanup for the current exception. */ | |
72b7eeff | 453 | |
c7ae64f2 JM |
454 | static void |
455 | push_eh_cleanup () | |
456 | { | |
de35891e | 457 | int yes; |
72b7eeff | 458 | |
20b90169 JM |
459 | expand_expr (build_unary_op (PREINCREMENT_EXPR, get_eh_handlers (), 1), |
460 | const0_rtx, VOIDmode, EXPAND_NORMAL); | |
461 | ||
de35891e JM |
462 | yes = suspend_momentary (); |
463 | /* All cleanups must last longer than normal. */ | |
464 | expand_decl_cleanup (NULL_TREE, do_pop_exception ()); | |
465 | resume_momentary (yes); | |
c7ae64f2 | 466 | } |
72b7eeff | 467 | |
f4a23343 JM |
468 | /* Build up a call to terminate on the function obstack, for use as an |
469 | exception handler. */ | |
470 | ||
471 | tree | |
472 | build_terminate_handler () | |
473 | { | |
474 | int yes = suspend_momentary (); | |
475 | tree term = build_function_call (Terminate, NULL_TREE); | |
476 | resume_momentary (yes); | |
477 | return term; | |
478 | } | |
479 | ||
8d2733ca MS |
480 | /* call this to start a catch block. Typename is the typename, and identifier |
481 | is the variable to place the object in or NULL if the variable doesn't | |
482 | matter. If typename is NULL, that means its a "catch (...)" or catch | |
483 | everything. In that case we don't need to do any type checking. | |
484 | (ie: it ends up as the "else" clause rather than an "else if" clause) */ | |
6467930b | 485 | |
8d08fdba | 486 | void |
a4443a08 MS |
487 | expand_start_catch_block (declspecs, declarator) |
488 | tree declspecs, declarator; | |
8d08fdba | 489 | { |
8d2733ca | 490 | rtx false_label_rtx; |
faae18ab | 491 | tree decl = NULL_TREE; |
a3b49ccd | 492 | tree init; |
8d2733ca | 493 | |
faf5394a MS |
494 | if (processing_template_decl) |
495 | { | |
496 | if (declspecs) | |
497 | { | |
498 | decl = grokdeclarator (declarator, declspecs, CATCHPARM, | |
499 | 1, NULL_TREE); | |
500 | pushdecl (decl); | |
501 | decl = build_min_nt (DECL_STMT, copy_to_permanent (declarator), | |
502 | copy_to_permanent (declspecs), | |
503 | NULL_TREE); | |
504 | add_tree (decl); | |
505 | } | |
506 | return; | |
507 | } | |
508 | ||
8d2733ca MS |
509 | if (! doing_eh (1)) |
510 | return; | |
511 | ||
c7ae64f2 JM |
512 | /* Create a binding level for the eh_info and the exception object |
513 | cleanup. */ | |
c11b6f21 | 514 | pushlevel (0); |
a3b49ccd MS |
515 | expand_start_bindings (0); |
516 | ||
f675499c | 517 | false_label_rtx = gen_label_rtx (); |
72b7eeff | 518 | push_label_entry (&false_label_stack, false_label_rtx, NULL_TREE); |
a3b49ccd | 519 | |
eb66be0e MS |
520 | emit_line_note (input_filename, lineno); |
521 | ||
6874c264 JM |
522 | push_eh_info (); |
523 | ||
faae18ab | 524 | if (declspecs) |
8d08fdba | 525 | { |
c11b6f21 | 526 | decl = grokdeclarator (declarator, declspecs, CATCHPARM, 1, NULL_TREE); |
faae18ab MS |
527 | |
528 | if (decl == NULL_TREE) | |
c7ae64f2 JM |
529 | error ("invalid catch parameter"); |
530 | } | |
95e8dcba | 531 | |
c7ae64f2 JM |
532 | if (decl) |
533 | { | |
534 | tree exp; | |
535 | rtx call_rtx, return_value_rtx; | |
536 | tree init_type; | |
faae18ab | 537 | |
be99da77 MS |
538 | /* Make sure we mark the catch param as used, otherwise we'll get |
539 | a warning about an unused ((anonymous)). */ | |
540 | TREE_USED (decl) = 1; | |
541 | ||
e92cc029 | 542 | /* Figure out the type that the initializer is. */ |
faae18ab | 543 | init_type = TREE_TYPE (decl); |
f30432d7 MS |
544 | if (TREE_CODE (init_type) != REFERENCE_TYPE |
545 | && TREE_CODE (init_type) != POINTER_TYPE) | |
faae18ab MS |
546 | init_type = build_reference_type (init_type); |
547 | ||
6874c264 | 548 | exp = get_eh_value (); |
92f5c135 JM |
549 | |
550 | /* Since pointers are passed by value, initialize a reference to | |
551 | pointer catch parm with the address of the value slot. */ | |
552 | if (TREE_CODE (init_type) == REFERENCE_TYPE | |
553 | && TREE_CODE (TREE_TYPE (init_type)) == POINTER_TYPE) | |
554 | exp = build_unary_op (ADDR_EXPR, exp, 1); | |
555 | ||
e66d884e | 556 | exp = expr_tree_cons (NULL_TREE, |
f30432d7 | 557 | build_eh_type_type (TREE_TYPE (decl)), |
e66d884e | 558 | expr_tree_cons (NULL_TREE, |
6874c264 | 559 | get_eh_type (), |
e66d884e | 560 | expr_tree_cons (NULL_TREE, exp, NULL_TREE))); |
faae18ab MS |
561 | exp = build_function_call (CatchMatch, exp); |
562 | call_rtx = expand_call (exp, NULL_RTX, 0); | |
8d2733ca | 563 | |
faae18ab | 564 | return_value_rtx = hard_function_value (ptr_type_node, exp); |
8d2733ca MS |
565 | |
566 | /* did the throw type match function return TRUE? */ | |
faae18ab | 567 | emit_cmp_insn (return_value_rtx, const0_rtx, EQ, NULL_RTX, |
8d2733ca MS |
568 | GET_MODE (return_value_rtx), 0, 0); |
569 | ||
570 | /* if it returned FALSE, jump over the catch block, else fall into it */ | |
faae18ab MS |
571 | emit_jump_insn (gen_beq (false_label_rtx)); |
572 | ||
95e8dcba JM |
573 | push_eh_cleanup (); |
574 | ||
c7ae64f2 JM |
575 | /* Create a binding level for the parm. */ |
576 | pushlevel (0); | |
577 | expand_start_bindings (0); | |
578 | ||
579 | init = convert_from_reference (make_tree (init_type, call_rtx)); | |
580 | ||
581 | /* If the constructor for the catch parm exits via an exception, we | |
582 | must call terminate. See eh23.C. */ | |
583 | if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))) | |
584 | { | |
585 | /* Generate the copy constructor call directly so we can wrap it. | |
586 | See also expand_default_init. */ | |
587 | init = ocp_convert (TREE_TYPE (decl), init, | |
588 | CONV_IMPLICIT|CONV_FORCE_TEMP, 0); | |
f4a23343 JM |
589 | init = build (TRY_CATCH_EXPR, TREE_TYPE (init), init, |
590 | build_terminate_handler ()); | |
c7ae64f2 | 591 | } |
faae18ab | 592 | |
b3417a04 | 593 | /* Let `cp_finish_decl' know that this initializer is ok. */ |
faae18ab MS |
594 | DECL_INITIAL (decl) = init; |
595 | decl = pushdecl (decl); | |
c7ae64f2 | 596 | |
b3417a04 | 597 | cp_finish_decl (decl, init, NULL_TREE, 0, LOOKUP_ONLYCONVERTING); |
8d08fdba | 598 | } |
95e8dcba JM |
599 | else |
600 | { | |
601 | push_eh_cleanup (); | |
602 | ||
c7ae64f2 JM |
603 | /* Create a binding level for the parm. */ |
604 | pushlevel (0); | |
605 | expand_start_bindings (0); | |
606 | ||
95e8dcba JM |
607 | /* Fall into the catch all section. */ |
608 | } | |
72b7eeff | 609 | |
6874c264 JM |
610 | init = build_modify_expr (get_eh_caught (), NOP_EXPR, integer_one_node); |
611 | expand_expr (init, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
f30432d7 | 612 | |
6467930b MS |
613 | emit_line_note (input_filename, lineno); |
614 | } | |
f30432d7 | 615 | |
f30432d7 | 616 | |
f30432d7 | 617 | |
8d2733ca MS |
618 | /* Call this to end a catch block. Its responsible for emitting the |
619 | code to handle jumping back to the correct place, and for emitting | |
620 | the label to jump to if this catch block didn't match. */ | |
6467930b | 621 | |
824b9a4c MS |
622 | void |
623 | expand_end_catch_block () | |
8d08fdba | 624 | { |
f30432d7 MS |
625 | if (! doing_eh (1)) |
626 | return; | |
8d2733ca | 627 | |
c7ae64f2 JM |
628 | /* Cleanup the EH parameter. */ |
629 | expand_end_bindings (getdecls (), kept_level_p (), 0); | |
630 | poplevel (kept_level_p (), 1, 0); | |
631 | ||
c7ae64f2 JM |
632 | /* Cleanup the EH object. */ |
633 | expand_end_bindings (getdecls (), kept_level_p (), 0); | |
634 | poplevel (kept_level_p (), 1, 0); | |
eb66be0e | 635 | |
eb66be0e MS |
636 | /* Fall to outside the try statement when done executing handler and |
637 | we fall off end of handler. This is jump Lresume in the | |
638 | documentation. */ | |
639 | expand_goto (top_label_entry (&caught_return_label_stack)); | |
640 | ||
6467930b | 641 | /* label we emit to jump to if this catch block didn't match. */ |
f30432d7 MS |
642 | /* This the closing } in the `if (eq) {' of the documentation. */ |
643 | emit_label (pop_label_entry (&false_label_stack)); | |
8d2733ca | 644 | } |
8d08fdba | 645 | |
6c20b7e9 JM |
646 | /* An exception spec is implemented more or less like: |
647 | ||
648 | try { | |
649 | function body; | |
650 | } catch (...) { | |
651 | void *p[] = { typeid(raises) }; | |
652 | __check_eh_spec (p, count); | |
653 | } | |
654 | ||
655 | __check_eh_spec in exception.cc handles all the details. */ | |
8d2733ca | 656 | |
f30432d7 MS |
657 | void |
658 | expand_start_eh_spec () | |
659 | { | |
6c20b7e9 | 660 | expand_start_try_stmts (); |
f30432d7 MS |
661 | } |
662 | ||
5566b478 | 663 | static void |
f30432d7 MS |
664 | expand_end_eh_spec (raises) |
665 | tree raises; | |
666 | { | |
6c20b7e9 JM |
667 | tree tmp, fn, decl, types = NULL_TREE; |
668 | int count = 0; | |
f30432d7 | 669 | |
6c20b7e9 JM |
670 | expand_start_all_catch (); |
671 | expand_start_catch_block (NULL_TREE, NULL_TREE); | |
f30432d7 | 672 | |
6c20b7e9 JM |
673 | /* Build up an array of type_infos. */ |
674 | for (; raises && TREE_VALUE (raises); raises = TREE_CHAIN (raises)) | |
675 | { | |
676 | types = expr_tree_cons | |
677 | (NULL_TREE, build_eh_type_type (TREE_VALUE (raises)), types); | |
678 | ++count; | |
679 | } | |
eb66be0e | 680 | |
6c20b7e9 JM |
681 | types = build_nt (CONSTRUCTOR, NULL_TREE, types); |
682 | TREE_HAS_CONSTRUCTOR (types) = 1; | |
6874c264 | 683 | |
6c20b7e9 JM |
684 | /* We can't pass the CONSTRUCTOR directly, so stick it in a variable. */ |
685 | tmp = build_array_type (const_ptr_type_node, NULL_TREE); | |
686 | decl = build_decl (VAR_DECL, NULL_TREE, tmp); | |
687 | DECL_ARTIFICIAL (decl) = 1; | |
688 | DECL_INITIAL (decl) = types; | |
689 | cp_finish_decl (decl, types, NULL_TREE, 0, 0); | |
690 | ||
691 | decl = decay_conversion (decl); | |
6874c264 | 692 | |
6c20b7e9 JM |
693 | fn = get_identifier ("__check_eh_spec"); |
694 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
695 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
696 | else | |
f30432d7 | 697 | { |
6c20b7e9 JM |
698 | push_obstacks_nochange (); |
699 | end_temporary_allocation (); | |
f30432d7 | 700 | |
6c20b7e9 JM |
701 | tmp = tree_cons |
702 | (NULL_TREE, integer_type_node, tree_cons | |
703 | (NULL_TREE, TREE_TYPE (decl), void_list_node)); | |
704 | tmp = build_function_type (void_type_node, tmp); | |
f30432d7 | 705 | |
6c20b7e9 JM |
706 | fn = build_lang_decl (FUNCTION_DECL, fn, tmp); |
707 | DECL_EXTERNAL (fn) = 1; | |
708 | TREE_PUBLIC (fn) = 1; | |
709 | DECL_ARTIFICIAL (fn) = 1; | |
710 | TREE_THIS_VOLATILE (fn) = 1; | |
711 | pushdecl_top_level (fn); | |
712 | make_function_rtl (fn); | |
713 | assemble_external (fn); | |
714 | pop_obstacks (); | |
715 | } | |
716 | ||
717 | tmp = expr_tree_cons (NULL_TREE, build_int_2 (count, 0), expr_tree_cons | |
718 | (NULL_TREE, decl, NULL_TREE)); | |
719 | tmp = build_call (fn, TREE_TYPE (TREE_TYPE (fn)), tmp); | |
720 | expand_expr (tmp, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
721 | ||
722 | expand_end_catch_block (); | |
723 | expand_end_all_catch (); | |
f30432d7 MS |
724 | } |
725 | ||
8d2733ca MS |
726 | /* This is called to expand all the toplevel exception handling |
727 | finalization for a function. It should only be called once per | |
728 | function. */ | |
6467930b | 729 | |
8d08fdba | 730 | void |
8d2733ca | 731 | expand_exception_blocks () |
8d08fdba | 732 | { |
92b96838 | 733 | do_pending_stack_adjust (); |
e00737d2 | 734 | push_to_sequence (catch_clauses); |
8d2733ca | 735 | expand_leftover_cleanups (); |
92b96838 | 736 | do_pending_stack_adjust (); |
e00737d2 | 737 | catch_clauses = get_insns (); |
f30432d7 | 738 | end_sequence (); |
eb448459 | 739 | |
eb448459 MS |
740 | /* Do this after we expand leftover cleanups, so that the |
741 | expand_eh_region_end that expand_end_eh_spec does will match the | |
742 | right expand_eh_region_start, and make sure it comes out before | |
743 | the terminate protected region. */ | |
f30432d7 MS |
744 | if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl))) |
745 | { | |
eb448459 | 746 | expand_end_eh_spec (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl))); |
92b96838 | 747 | do_pending_stack_adjust (); |
e00737d2 | 748 | push_to_sequence (catch_clauses); |
eb448459 | 749 | expand_leftover_cleanups (); |
92b96838 | 750 | do_pending_stack_adjust (); |
e00737d2 | 751 | catch_clauses = get_insns (); |
eb448459 | 752 | end_sequence (); |
f30432d7 MS |
753 | } |
754 | ||
e00737d2 | 755 | if (catch_clauses) |
f30432d7 | 756 | { |
e00737d2 MS |
757 | rtx funcend = gen_label_rtx (); |
758 | emit_jump (funcend); | |
759 | ||
eb66be0e MS |
760 | /* We cannot protect n regions this way if we must flow into the |
761 | EH region through the top of the region, as we have to with | |
762 | the setjmp/longjmp approach. */ | |
763 | if (exceptions_via_longjmp == 0) | |
fb98cff6 | 764 | expand_eh_region_start (); |
f30432d7 | 765 | |
e00737d2 MS |
766 | emit_insns (catch_clauses); |
767 | catch_clauses = NULL_RTX; | |
eb66be0e MS |
768 | |
769 | if (exceptions_via_longjmp == 0) | |
f4a23343 | 770 | expand_eh_region_end (build_terminate_handler ()); |
eb66be0e | 771 | |
6467930b | 772 | expand_leftover_cleanups (); |
f30432d7 | 773 | |
e00737d2 MS |
774 | emit_label (funcend); |
775 | } | |
8d08fdba MS |
776 | } |
777 | ||
72b7eeff MS |
778 | tree |
779 | start_anon_func () | |
780 | { | |
781 | static int counter = 0; | |
e92cc029 | 782 | int old_interface_unknown = interface_unknown; |
72b7eeff MS |
783 | char name[32]; |
784 | tree params; | |
785 | tree t; | |
786 | ||
787 | push_cp_function_context (NULL_TREE); | |
788 | push_to_top_level (); | |
789 | ||
790 | /* No need to mangle this. */ | |
791 | push_lang_context (lang_name_c); | |
792 | ||
e92cc029 MS |
793 | interface_unknown = 1; |
794 | ||
72b7eeff | 795 | params = void_list_node; |
956d6950 | 796 | /* tcf stands for throw clean function. */ |
72b7eeff | 797 | sprintf (name, "__tcf_%d", counter++); |
c11b6f21 MS |
798 | t = make_call_declarator (get_identifier (name), params, NULL_TREE, |
799 | NULL_TREE); | |
72b7eeff MS |
800 | start_function (decl_tree_cons (NULL_TREE, get_identifier ("static"), |
801 | void_list_node), | |
c11b6f21 | 802 | t, NULL_TREE, 0); |
72b7eeff MS |
803 | store_parm_decls (); |
804 | pushlevel (0); | |
805 | clear_last_expr (); | |
806 | push_momentary (); | |
807 | expand_start_bindings (0); | |
808 | emit_line_note (input_filename, lineno); | |
809 | ||
e92cc029 MS |
810 | interface_unknown = old_interface_unknown; |
811 | ||
72b7eeff MS |
812 | pop_lang_context (); |
813 | ||
814 | return current_function_decl; | |
815 | } | |
816 | ||
817 | void | |
818 | end_anon_func () | |
819 | { | |
fc378698 | 820 | expand_end_bindings (getdecls (), 1, 0); |
72b7eeff MS |
821 | poplevel (1, 0, 0); |
822 | pop_momentary (); | |
823 | ||
824 | finish_function (lineno, 0, 0); | |
825 | ||
826 | pop_from_top_level (); | |
827 | pop_cp_function_context (NULL_TREE); | |
828 | } | |
8d2733ca | 829 | |
f4a23343 JM |
830 | /* Return a pointer to a buffer for an exception object of type TYPE. */ |
831 | ||
832 | tree | |
833 | alloc_eh_object (type) | |
834 | tree type; | |
835 | { | |
836 | tree fn, exp; | |
837 | ||
838 | fn = get_identifier ("__eh_alloc"); | |
839 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
840 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
841 | else | |
842 | { | |
843 | /* Declare __eh_alloc (size_t), as defined in exception.cc. */ | |
844 | tree tmp; | |
845 | push_obstacks_nochange (); | |
846 | end_temporary_allocation (); | |
847 | tmp = tree_cons (NULL_TREE, sizetype, void_list_node); | |
848 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
849 | build_function_type (ptr_type_node, tmp)); | |
850 | DECL_EXTERNAL (fn) = 1; | |
851 | TREE_PUBLIC (fn) = 1; | |
852 | DECL_ARTIFICIAL (fn) = 1; | |
853 | pushdecl_top_level (fn); | |
854 | make_function_rtl (fn); | |
855 | assemble_external (fn); | |
856 | pop_obstacks (); | |
857 | } | |
858 | ||
859 | exp = build_function_call (fn, expr_tree_cons | |
860 | (NULL_TREE, size_in_bytes (type), NULL_TREE)); | |
861 | exp = build1 (NOP_EXPR, build_pointer_type (type), exp); | |
862 | return exp; | |
863 | } | |
864 | ||
6467930b | 865 | /* Expand a throw statement. This follows the following |
8d2733ca MS |
866 | algorithm: |
867 | ||
868 | 1. Allocate space to save the current PC onto the stack. | |
869 | 2. Generate and emit a label and save its address into the | |
e1cd6e56 | 870 | newly allocated stack space since we can't save the pc directly. |
8d2733ca MS |
871 | 3. If this is the first call to throw in this function: |
872 | generate a label for the throw block | |
873 | 4. jump to the throw block label. */ | |
6467930b | 874 | |
8d08fdba | 875 | void |
8d2733ca MS |
876 | expand_throw (exp) |
877 | tree exp; | |
8d08fdba | 878 | { |
6874c264 JM |
879 | tree fn; |
880 | static tree cleanup_type; | |
8d08fdba | 881 | |
8d2733ca MS |
882 | if (! doing_eh (1)) |
883 | return; | |
8d08fdba | 884 | |
8d2733ca MS |
885 | if (exp) |
886 | { | |
faae18ab | 887 | tree throw_type; |
6874c264 | 888 | tree cleanup = NULL_TREE, e; |
faae18ab | 889 | |
a3b49ccd | 890 | /* throw expression */ |
e92cc029 | 891 | /* First, decay it. */ |
f30432d7 | 892 | exp = decay_conversion (exp); |
a3b49ccd | 893 | |
6874c264 JM |
894 | /* cleanup_type is void (*)(void *, int), |
895 | the internal type of a destructor. */ | |
896 | if (cleanup_type == NULL_TREE) | |
897 | { | |
898 | push_obstacks_nochange (); | |
899 | end_temporary_allocation (); | |
900 | cleanup_type = build_pointer_type | |
901 | (build_function_type | |
902 | (void_type_node, tree_cons | |
903 | (NULL_TREE, ptr_type_node, tree_cons | |
904 | (NULL_TREE, integer_type_node, void_list_node)))); | |
905 | pop_obstacks (); | |
906 | } | |
907 | ||
f30432d7 MS |
908 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) |
909 | { | |
910 | throw_type = build_eh_type (exp); | |
911 | exp = build_reinterpret_cast (ptr_type_node, exp); | |
912 | } | |
913 | else | |
914 | { | |
f4a23343 JM |
915 | tree object, ptr; |
916 | ||
917 | /* OK, this is kind of wacky. The WP says that we call | |
918 | terminate | |
919 | ||
920 | when the exception handling mechanism, after completing | |
921 | evaluation of the expression to be thrown but before the | |
922 | exception is caught (_except.throw_), calls a user function | |
923 | that exits via an uncaught exception. | |
924 | ||
925 | So we have to protect the actual initialization of the | |
926 | exception object with terminate(), but evaluate the expression | |
927 | first. We also expand the call to __eh_alloc | |
928 | first. Since there could be temps in the expression, we need | |
929 | to handle that, too. */ | |
a50f0918 | 930 | |
f4a23343 JM |
931 | expand_start_target_temps (); |
932 | ||
933 | #if 0 | |
934 | /* Unfortunately, this doesn't work. */ | |
935 | preexpand_calls (exp); | |
936 | #else | |
937 | /* Store the throw expression into a temp. This can be less | |
938 | efficient than storing it into the allocated space directly, but | |
939 | oh well. To do this efficiently we would need to insinuate | |
940 | ourselves into expand_call. */ | |
941 | if (TREE_SIDE_EFFECTS (exp)) | |
942 | { | |
943 | tree temp = build (VAR_DECL, TREE_TYPE (exp)); | |
944 | DECL_ARTIFICIAL (temp) = 1; | |
945 | layout_decl (temp, 0); | |
946 | DECL_RTL (temp) = assign_temp (TREE_TYPE (exp), 2, 0, 1); | |
947 | expand_expr (build (INIT_EXPR, TREE_TYPE (exp), temp, exp), | |
948 | NULL_RTX, VOIDmode, 0); | |
949 | expand_decl_cleanup (NULL_TREE, maybe_build_cleanup (temp)); | |
950 | exp = temp; | |
951 | } | |
952 | #endif | |
953 | ||
954 | /* Allocate the space for the exception. */ | |
955 | ptr = save_expr (alloc_eh_object (TREE_TYPE (exp))); | |
956 | expand_expr (ptr, const0_rtx, VOIDmode, 0); | |
957 | ||
958 | expand_eh_region_start (); | |
959 | ||
960 | object = build_indirect_ref (ptr, NULL_PTR); | |
961 | exp = build_modify_expr (object, INIT_EXPR, exp); | |
faae18ab | 962 | |
f30432d7 MS |
963 | if (exp == error_mark_node) |
964 | error (" in thrown expression"); | |
faae18ab | 965 | |
f4a23343 JM |
966 | expand_expr (exp, const0_rtx, VOIDmode, 0); |
967 | expand_eh_region_end (build_terminate_handler ()); | |
968 | expand_end_target_temps (); | |
969 | ||
72b7eeff MS |
970 | throw_type = build_eh_type (object); |
971 | ||
6874c264 JM |
972 | if (TYPE_HAS_DESTRUCTOR (TREE_TYPE (object))) |
973 | { | |
974 | cleanup = lookup_fnfields (TYPE_BINFO (TREE_TYPE (object)), | |
975 | dtor_identifier, 0); | |
976 | cleanup = TREE_VALUE (cleanup); | |
e872bb7a | 977 | mark_used (cleanup); |
6874c264 JM |
978 | mark_addressable (cleanup); |
979 | /* Pretend it's a normal function. */ | |
980 | cleanup = build1 (ADDR_EXPR, cleanup_type, cleanup); | |
981 | } | |
f4a23343 JM |
982 | |
983 | exp = ptr; | |
f30432d7 | 984 | } |
faae18ab | 985 | |
6874c264 JM |
986 | if (cleanup == NULL_TREE) |
987 | { | |
988 | cleanup = build_int_2 (0, 0); | |
989 | TREE_TYPE (cleanup) = cleanup_type; | |
990 | } | |
72b7eeff | 991 | |
6874c264 JM |
992 | fn = get_identifier ("__cp_push_exception"); |
993 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
994 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
995 | else | |
996 | { | |
997 | /* Declare __cp_push_exception (void*, void*, void (*)(void*, int)), | |
998 | as defined in exception.cc. */ | |
999 | tree tmp; | |
1000 | push_obstacks_nochange (); | |
1001 | end_temporary_allocation (); | |
1002 | tmp = tree_cons | |
1003 | (NULL_TREE, ptr_type_node, tree_cons | |
1004 | (NULL_TREE, ptr_type_node, tree_cons | |
1005 | (NULL_TREE, cleanup_type, void_list_node))); | |
1006 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
1007 | build_function_type (void_type_node, tmp)); | |
1008 | DECL_EXTERNAL (fn) = 1; | |
1009 | TREE_PUBLIC (fn) = 1; | |
1010 | DECL_ARTIFICIAL (fn) = 1; | |
1011 | pushdecl_top_level (fn); | |
1012 | make_function_rtl (fn); | |
1013 | assemble_external (fn); | |
1014 | pop_obstacks (); | |
1015 | } | |
72b7eeff | 1016 | |
6874c264 JM |
1017 | e = expr_tree_cons (NULL_TREE, exp, expr_tree_cons |
1018 | (NULL_TREE, throw_type, expr_tree_cons | |
1019 | (NULL_TREE, cleanup, NULL_TREE))); | |
1020 | e = build_function_call (fn, e); | |
1021 | expand_expr (e, const0_rtx, VOIDmode, 0); | |
8d2733ca MS |
1022 | } |
1023 | else | |
a3b49ccd | 1024 | { |
6874c264 JM |
1025 | /* rethrow current exception; note that it's no longer caught. */ |
1026 | ||
1027 | tree fn = get_identifier ("__uncatch_exception"); | |
1028 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
1029 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
1030 | else | |
1031 | { | |
1032 | /* Declare void __uncatch_exception (void) | |
1033 | as defined in exception.cc. */ | |
1034 | push_obstacks_nochange (); | |
1035 | end_temporary_allocation (); | |
1036 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
1037 | build_function_type (void_type_node, | |
1038 | void_list_node)); | |
1039 | DECL_EXTERNAL (fn) = 1; | |
1040 | TREE_PUBLIC (fn) = 1; | |
1041 | DECL_ARTIFICIAL (fn) = 1; | |
1042 | pushdecl_top_level (fn); | |
1043 | make_function_rtl (fn); | |
1044 | assemble_external (fn); | |
1045 | pop_obstacks (); | |
1046 | } | |
1047 | ||
1048 | exp = build_function_call (fn, NULL_TREE); | |
1049 | expand_expr (exp, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
a3b49ccd | 1050 | } |
8d2733ca | 1051 | |
e701eb4d | 1052 | expand_internal_throw (); |
f376e137 | 1053 | } |
8d2733ca MS |
1054 | |
1055 | /* Build a throw expression. */ | |
6467930b | 1056 | |
8d2733ca MS |
1057 | tree |
1058 | build_throw (e) | |
1059 | tree e; | |
1060 | { | |
db5ae43f MS |
1061 | if (e != error_mark_node) |
1062 | { | |
5156628f | 1063 | if (processing_template_decl) |
fc378698 | 1064 | return build_min (THROW_EXPR, void_type_node, e); |
db5ae43f MS |
1065 | e = build1 (THROW_EXPR, void_type_node, e); |
1066 | TREE_SIDE_EFFECTS (e) = 1; | |
faae18ab | 1067 | TREE_USED (e) = 1; |
db5ae43f | 1068 | } |
8d2733ca | 1069 | return e; |
8d08fdba | 1070 | } |