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Commit | Line | Data |
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8d08fdba | 1 | /* Handle exceptional things in C++. |
d6a8bdff | 2 | Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000 |
158991b7 | 3 | Free Software Foundation, Inc. |
8d2733ca MS |
4 | Contributed by Michael Tiemann <tiemann@cygnus.com> |
5 | Rewritten by Mike Stump <mrs@cygnus.com>, based upon an | |
6 | initial re-implementation courtesy Tad Hunt. | |
8d08fdba MS |
7 | |
8 | This file is part of GNU CC. | |
9 | ||
10 | GNU CC is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2, or (at your option) | |
13 | any later version. | |
14 | ||
15 | GNU CC is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with GNU CC; see the file COPYING. If not, write to | |
e9fa0c7c RK |
22 | the Free Software Foundation, 59 Temple Place - Suite 330, |
23 | Boston, MA 02111-1307, USA. */ | |
8d08fdba MS |
24 | |
25 | ||
8d08fdba | 26 | #include "config.h" |
8d052bc7 | 27 | #include "system.h" |
8d08fdba MS |
28 | #include "tree.h" |
29 | #include "rtl.h" | |
30 | #include "cp-tree.h" | |
31 | #include "flags.h" | |
8d2733ca MS |
32 | #include "obstack.h" |
33 | #include "expr.h" | |
21451173 | 34 | #include "output.h" |
6467930b | 35 | #include "except.h" |
0021b564 | 36 | #include "defaults.h" |
54f92bfb | 37 | #include "toplev.h" |
9a0d1e1b | 38 | #include "eh-common.h" |
8d08fdba | 39 | |
93ca4ba7 | 40 | static void push_eh_cleanup PARAMS ((tree)); |
158991b7 KG |
41 | static tree build_eh_type_type PARAMS ((tree)); |
42 | static tree call_eh_info PARAMS ((void)); | |
43 | static void push_eh_info PARAMS ((void)); | |
44 | static tree get_eh_info PARAMS ((void)); | |
45 | static tree get_eh_value PARAMS ((void)); | |
87603ed0 | 46 | #if 0 |
158991b7 KG |
47 | static tree get_eh_type PARAMS ((void)); |
48 | static tree get_eh_caught PARAMS ((void)); | |
49 | static tree get_eh_handlers PARAMS ((void)); | |
e833cb11 | 50 | #endif |
93ca4ba7 JM |
51 | static int dtor_nothrow PARAMS ((tree)); |
52 | static tree do_pop_exception PARAMS ((tree)); | |
158991b7 KG |
53 | static tree build_eh_type_type_ref PARAMS ((tree)); |
54 | static tree build_terminate_handler PARAMS ((void)); | |
55 | static tree alloc_eh_object PARAMS ((tree)); | |
56 | static int complete_ptr_ref_or_void_ptr_p PARAMS ((tree, tree)); | |
57 | static void initialize_handler_parm PARAMS ((tree)); | |
58 | static tree expand_throw PARAMS ((tree)); | |
e97f22c9 | 59 | static int decl_is_java_type PARAMS ((tree decl, int err)); |
8d2733ca | 60 | |
8d2733ca | 61 | #if 0 |
e92cc029 | 62 | /* This is the startup, and finish stuff per exception table. */ |
8d08fdba | 63 | |
8d2733ca MS |
64 | /* XXX - Tad: exception handling section */ |
65 | #ifndef EXCEPT_SECTION_ASM_OP | |
66 | #define EXCEPT_SECTION_ASM_OP "section\t.gcc_except_table,\"a\",@progbits" | |
67 | #endif | |
8d08fdba | 68 | |
8d2733ca | 69 | #ifdef EXCEPT_SECTION_ASM_OP |
8d08fdba | 70 | |
8d2733ca MS |
71 | /* on machines which support it, the exception table lives in another section, |
72 | but it needs a label so we can reference it... This sets up that | |
73 | label! */ | |
74 | asm (EXCEPT_SECTION_ASM_OP); | |
75 | exception_table __EXCEPTION_TABLE__[1] = { (void*)0, (void*)0, (void*)0 }; | |
76 | asm (TEXT_SECTION_ASM_OP); | |
8d08fdba | 77 | |
8d2733ca | 78 | #endif /* EXCEPT_SECTION_ASM_OP */ |
8d08fdba | 79 | |
8d2733ca MS |
80 | #ifdef EXCEPT_SECTION_ASM_OP |
81 | ||
82 | /* we need to know where the end of the exception table is... so this | |
83 | is how we do it! */ | |
84 | ||
85 | asm (EXCEPT_SECTION_ASM_OP); | |
86 | exception_table __EXCEPTION_END__[1] = { (void*)-1, (void*)-1, (void*)-1 }; | |
87 | asm (TEXT_SECTION_ASM_OP); | |
88 | ||
89 | #endif /* EXCEPT_SECTION_ASM_OP */ | |
90 | ||
91 | #endif | |
8d08fdba | 92 | |
8d2733ca | 93 | #include "decl.h" |
8d2733ca MS |
94 | #include "insn-flags.h" |
95 | #include "obstack.h" | |
8d2733ca | 96 | |
e97f22c9 TT |
97 | /* In a given translation unit we are constrained to catch only C++ |
98 | types or only Java types. `catch_language' holds the current type, | |
99 | and `catch_language_init' registers whether `catch_language' has | |
100 | been set. */ | |
101 | ||
102 | static int catch_language_init = 0; | |
103 | static int catch_language; | |
104 | ||
8d2733ca MS |
105 | /* ====================================================================== |
106 | Briefly the algorithm works like this: | |
107 | ||
108 | When a constructor or start of a try block is encountered, | |
109 | push_eh_entry (&eh_stack) is called. Push_eh_entry () creates a | |
110 | new entry in the unwind protection stack and returns a label to | |
111 | output to start the protection for that block. | |
112 | ||
113 | When a destructor or end try block is encountered, pop_eh_entry | |
6467930b MS |
114 | (&eh_stack) is called. Pop_eh_entry () returns the eh_entry it |
115 | created when push_eh_entry () was called. The eh_entry structure | |
8d2733ca MS |
116 | contains three things at this point. The start protect label, |
117 | the end protect label, and the exception handler label. The end | |
118 | protect label should be output before the call to the destructor | |
119 | (if any). If it was a destructor, then its parse tree is stored | |
6467930b | 120 | in the finalization variable in the eh_entry structure. Otherwise |
8d2733ca | 121 | the finalization variable is set to NULL to reflect the fact that |
38e01259 | 122 | it is the end of a try block. Next, this modified eh_entry node |
8d2733ca MS |
123 | is enqueued in the finalizations queue by calling |
124 | enqueue_eh_entry (&queue,entry). | |
125 | ||
126 | +---------------------------------------------------------------+ | |
127 | |XXX: Will need modification to deal with partially | | |
128 | | constructed arrays of objects | | |
129 | | | | |
130 | | Basically, this consists of keeping track of how many | | |
131 | | of the objects have been constructed already (this | | |
132 | | should be in a register though, so that shouldn't be a | | |
133 | | problem. | | |
134 | +---------------------------------------------------------------+ | |
135 | ||
136 | When a catch block is encountered, there is a lot of work to be | |
137 | done. | |
138 | ||
139 | Since we don't want to generate the catch block inline with the | |
140 | regular flow of the function, we need to have some way of doing | |
f30432d7 MS |
141 | so. Luckily, we can use sequences to defer the catch sections. |
142 | When the start of a catch block is encountered, we start the | |
143 | sequence. After the catch block is generated, we end the | |
144 | sequence. | |
145 | ||
8d2733ca MS |
146 | Next we must insure that when the catch block is executed, all |
147 | finalizations for the matching try block have been completed. If | |
148 | any of those finalizations throw an exception, we must call | |
149 | terminate according to the ARM (section r.15.6.1). What this | |
150 | means is that we need to dequeue and emit finalizations for each | |
6467930b | 151 | entry in the eh_queue until we get to an entry with a NULL |
8d2733ca MS |
152 | finalization field. For any of the finalization entries, if it |
153 | is not a call to terminate (), we must protect it by giving it | |
154 | another start label, end label, and exception handler label, | |
155 | setting its finalization tree to be a call to terminate (), and | |
6467930b | 156 | enqueue'ing this new eh_entry to be output at an outer level. |
8d2733ca MS |
157 | Finally, after all that is done, we can get around to outputting |
158 | the catch block which basically wraps all the "catch (...) {...}" | |
159 | statements in a big if/then/else construct that matches the | |
160 | correct block to call. | |
161 | ||
162 | ===================================================================== */ | |
163 | ||
8d2733ca MS |
164 | /* ====================================================================== */ |
165 | ||
8d2733ca | 166 | /* sets up all the global eh stuff that needs to be initialized at the |
bbd0d54a | 167 | start of compilation. */ |
8d08fdba | 168 | |
8d08fdba | 169 | void |
8d2733ca | 170 | init_exception_processing () |
8d08fdba | 171 | { |
6633d636 MS |
172 | /* void vtype () */ |
173 | tree vtype = build_function_type (void_type_node, void_list_node); | |
174 | ||
2c73f9f5 ML |
175 | if (flag_honor_std) |
176 | push_namespace (get_identifier ("std")); | |
0c11ada6 | 177 | terminate_node = build_cp_library_fn_ptr ("terminate", vtype); |
9cd64686 | 178 | TREE_THIS_VOLATILE (terminate_node) = 1; |
0c11ada6 | 179 | TREE_NOTHROW (terminate_node) = 1; |
2c73f9f5 ML |
180 | if (flag_honor_std) |
181 | pop_namespace (); | |
8ccc31eb | 182 | |
9a0d1e1b AM |
183 | set_exception_lang_code (EH_LANG_C_plus_plus); |
184 | set_exception_version_code (1); | |
9a0d1e1b | 185 | |
eb66be0e MS |
186 | /* If we use setjmp/longjmp EH, arrange for all cleanup actions to |
187 | be protected with __terminate. */ | |
188 | protect_cleanup_actions_with_terminate = 1; | |
8d2733ca MS |
189 | } |
190 | ||
95e8dcba | 191 | /* Retrieve a pointer to the cp_eh_info node for the current exception. */ |
6874c264 | 192 | |
95e8dcba JM |
193 | static tree |
194 | call_eh_info () | |
6874c264 | 195 | { |
95e8dcba | 196 | tree fn; |
6874c264 | 197 | |
e6cfb550 | 198 | fn = get_identifier ("__start_cp_handler"); |
6874c264 JM |
199 | if (IDENTIFIER_GLOBAL_VALUE (fn)) |
200 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
201 | else | |
202 | { | |
a1622f83 | 203 | tree t1, t, fields[7]; |
6874c264 | 204 | |
e6cfb550 | 205 | /* Declare cp_eh_info * __start_cp_handler (void), |
6874c264 | 206 | as defined in exception.cc. */ |
6874c264 JM |
207 | |
208 | /* struct cp_eh_info. This must match exception.cc. Note that this | |
209 | type is not pushed anywhere. */ | |
33848bb0 | 210 | t1= make_aggr_type (RECORD_TYPE); |
4ce3d537 | 211 | fields[0] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 212 | get_identifier ("handler_label"), ptr_type_node); |
4ce3d537 | 213 | fields[1] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 214 | get_identifier ("dynamic_handler_chain"), ptr_type_node); |
4ce3d537 | 215 | fields[2] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 216 | get_identifier ("info"), ptr_type_node); |
4ce3d537 | 217 | fields[3] = build_lang_decl (FIELD_DECL, |
e6cfb550 | 218 | get_identifier ("table_index"), ptr_type_node); |
9a0d1e1b AM |
219 | /* N.B.: The fourth field LEN is expected to be |
220 | the number of fields - 1, not the total number of fields. */ | |
e6cfb550 | 221 | finish_builtin_type (t1, "eh_context", fields, 3, ptr_type_node); |
9a0d1e1b AM |
222 | t1 = build_pointer_type (t1); |
223 | ||
33848bb0 | 224 | t1= make_aggr_type (RECORD_TYPE); |
4ce3d537 | 225 | fields[0] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 226 | get_identifier ("match_function"), ptr_type_node); |
4ce3d537 | 227 | fields[1] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 228 | get_identifier ("language"), short_integer_type_node); |
4ce3d537 | 229 | fields[2] = build_lang_decl (FIELD_DECL, |
9a0d1e1b AM |
230 | get_identifier ("version"), short_integer_type_node); |
231 | /* N.B.: The fourth field LEN is expected to be | |
232 | the number of fields - 1, not the total number of fields. */ | |
5816cb14 | 233 | finish_builtin_type (t1, "__eh_info", fields, 2, ptr_type_node); |
33848bb0 | 234 | t = make_aggr_type (RECORD_TYPE); |
4ce3d537 MM |
235 | fields[0] = build_lang_decl (FIELD_DECL, |
236 | get_identifier ("eh_info"), t1); | |
237 | fields[1] = build_lang_decl (FIELD_DECL, get_identifier ("value"), | |
238 | ptr_type_node); | |
239 | fields[2] = build_lang_decl (FIELD_DECL, get_identifier ("type"), | |
240 | ptr_type_node); | |
241 | fields[3] = build_lang_decl | |
6874c264 JM |
242 | (FIELD_DECL, get_identifier ("cleanup"), |
243 | build_pointer_type (build_function_type | |
244 | (ptr_type_node, tree_cons | |
245 | (NULL_TREE, ptr_type_node, void_list_node)))); | |
4ce3d537 MM |
246 | fields[4] = build_lang_decl (FIELD_DECL, get_identifier ("caught"), |
247 | boolean_type_node); | |
248 | fields[5] = build_lang_decl (FIELD_DECL, get_identifier ("next"), | |
249 | build_pointer_type (t)); | |
250 | fields[6] = build_lang_decl | |
20b90169 | 251 | (FIELD_DECL, get_identifier ("handlers"), long_integer_type_node); |
cf9d67e3 BK |
252 | /* N.B.: The fourth field LEN is expected to be |
253 | the number of fields - 1, not the total number of fields. */ | |
a1622f83 | 254 | finish_builtin_type (t, "cp_eh_info", fields, 6, ptr_type_node); |
6874c264 JM |
255 | t = build_pointer_type (t); |
256 | ||
257 | /* And now the function. */ | |
0c11ada6 | 258 | fn = push_library_fn (fn, build_function_type (t, void_list_node)); |
6874c264 | 259 | } |
95e8dcba JM |
260 | return build_function_call (fn, NULL_TREE); |
261 | } | |
262 | ||
263 | /* Retrieve a pointer to the cp_eh_info node for the current exception | |
264 | and save it in the current binding level. */ | |
265 | ||
266 | static void | |
267 | push_eh_info () | |
268 | { | |
269 | tree decl, fn = call_eh_info (); | |
6874c264 JM |
270 | |
271 | /* Remember the pointer to the current exception info; it won't change | |
272 | during this catch block. */ | |
273 | decl = build_decl (VAR_DECL, get_identifier ("__exception_info"), | |
274 | TREE_TYPE (fn)); | |
275 | DECL_ARTIFICIAL (decl) = 1; | |
276 | DECL_INITIAL (decl) = fn; | |
277 | decl = pushdecl (decl); | |
cd9f6678 | 278 | cp_finish_decl (decl, fn, NULL_TREE, 0); |
6874c264 JM |
279 | } |
280 | ||
281 | /* Returns a reference to the cp_eh_info node for the current exception. */ | |
282 | ||
283 | static tree | |
284 | get_eh_info () | |
285 | { | |
286 | /* Look for the pointer pushed in push_eh_info. */ | |
287 | tree t = lookup_name (get_identifier ("__exception_info"), 0); | |
288 | return build_indirect_ref (t, NULL_PTR); | |
289 | } | |
290 | ||
291 | /* Returns a reference to the current exception object. */ | |
292 | ||
293 | static tree | |
294 | get_eh_value () | |
295 | { | |
296 | return build_component_ref (get_eh_info (), get_identifier ("value"), | |
297 | NULL_TREE, 0); | |
298 | } | |
299 | ||
300 | /* Returns a reference to the current exception type. */ | |
301 | ||
87603ed0 | 302 | #if 0 |
6874c264 JM |
303 | static tree |
304 | get_eh_type () | |
305 | { | |
306 | return build_component_ref (get_eh_info (), get_identifier ("type"), | |
307 | NULL_TREE, 0); | |
308 | } | |
309 | ||
310 | /* Returns a reference to whether or not the current exception | |
311 | has been caught. */ | |
312 | ||
313 | static tree | |
314 | get_eh_caught () | |
315 | { | |
316 | return build_component_ref (get_eh_info (), get_identifier ("caught"), | |
317 | NULL_TREE, 0); | |
318 | } | |
319 | ||
20b90169 JM |
320 | /* Returns a reference to whether or not the current exception |
321 | has been caught. */ | |
322 | ||
323 | static tree | |
324 | get_eh_handlers () | |
325 | { | |
326 | return build_component_ref (get_eh_info (), get_identifier ("handlers"), | |
327 | NULL_TREE, 0); | |
328 | } | |
e833cb11 | 329 | #endif |
20b90169 | 330 | |
f30432d7 MS |
331 | /* Build a type value for use at runtime for a type that is matched |
332 | against by the exception handling system. */ | |
6467930b | 333 | |
f30432d7 MS |
334 | static tree |
335 | build_eh_type_type (type) | |
336 | tree type; | |
8d08fdba | 337 | { |
f30432d7 MS |
338 | if (type == error_mark_node) |
339 | return error_mark_node; | |
8d2733ca | 340 | |
e92cc029 | 341 | /* peel back references, so they match. */ |
f30432d7 MS |
342 | if (TREE_CODE (type) == REFERENCE_TYPE) |
343 | type = TREE_TYPE (type); | |
8d08fdba | 344 | |
e92cc029 | 345 | /* Peel off cv qualifiers. */ |
f30432d7 | 346 | type = TYPE_MAIN_VARIANT (type); |
8d2733ca | 347 | |
db48b831 | 348 | return build1 (ADDR_EXPR, ptr_type_node, get_typeid_1 (type)); |
8d08fdba | 349 | } |
8d08fdba | 350 | |
e5f614d7 | 351 | /* Build the address of a typeinfo decl for use in the runtime |
db48b831 | 352 | matching field of the new exception model */ |
5816cb14 AM |
353 | |
354 | static tree | |
355 | build_eh_type_type_ref (type) | |
356 | tree type; | |
357 | { | |
5816cb14 | 358 | tree exp; |
5816cb14 | 359 | |
93ca4ba7 JM |
360 | if (type == NULL_TREE || type == error_mark_node) |
361 | return type; | |
5816cb14 AM |
362 | |
363 | /* peel back references, so they match. */ | |
364 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
365 | type = TREE_TYPE (type); | |
366 | ||
367 | /* Peel off cv qualifiers. */ | |
368 | type = TYPE_MAIN_VARIANT (type); | |
369 | ||
e5f614d7 NS |
370 | exp = get_tinfo_decl (type); |
371 | mark_used (exp); | |
db48b831 | 372 | exp = build1 (ADDR_EXPR, ptr_type_node, exp); |
5816cb14 | 373 | |
5816cb14 AM |
374 | return (exp); |
375 | } | |
376 | ||
9c606f69 | 377 | /* This routine is called to mark all the symbols representing runtime |
ae673f14 | 378 | type functions in the exception table as having been referenced. |
9c606f69 | 379 | This will make sure code is emitted for them. Called from finish_file. */ |
93ca4ba7 | 380 | |
9c606f69 AM |
381 | void |
382 | mark_all_runtime_matches () | |
383 | { | |
384 | int x,num; | |
385 | void **ptr; | |
386 | tree exp; | |
387 | ||
388 | num = find_all_handler_type_matches (&ptr); | |
389 | if (num == 0 || ptr == NULL) | |
390 | return; | |
391 | ||
392 | for (x=0; x <num; x++) | |
393 | { | |
394 | exp = (tree) ptr[x]; | |
395 | if (TREE_CODE (exp) == ADDR_EXPR) | |
396 | { | |
397 | exp = TREE_OPERAND (exp, 0); | |
398 | if (TREE_CODE (exp) == FUNCTION_DECL) | |
399 | TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (exp)) = 1; | |
400 | } | |
401 | } | |
402 | ||
403 | free (ptr); | |
404 | } | |
405 | ||
93ca4ba7 JM |
406 | /* Returns nonzero if cleaning up an exception of type TYPE (which can be |
407 | NULL_TREE for a ... handler) will not throw an exception. */ | |
408 | ||
409 | static int | |
410 | dtor_nothrow (type) | |
411 | tree type; | |
412 | { | |
413 | tree fn; | |
414 | ||
415 | if (type == NULL_TREE) | |
416 | return 0; | |
417 | ||
418 | if (! TYPE_HAS_DESTRUCTOR (type)) | |
419 | return 1; | |
420 | ||
421 | fn = lookup_member (type, dtor_identifier, 0, 0); | |
422 | fn = TREE_VALUE (fn); | |
423 | return TREE_NOTHROW (fn); | |
424 | } | |
425 | ||
c7ae64f2 | 426 | /* Build up a call to __cp_pop_exception, to destroy the exception object |
93ca4ba7 | 427 | for the current catch block if no others are currently using it. */ |
6467930b | 428 | |
c7ae64f2 | 429 | static tree |
93ca4ba7 JM |
430 | do_pop_exception (type) |
431 | tree type; | |
72b7eeff | 432 | { |
6874c264 | 433 | tree fn, cleanup; |
6874c264 JM |
434 | fn = get_identifier ("__cp_pop_exception"); |
435 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
436 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
437 | else | |
438 | { | |
c7ae64f2 JM |
439 | /* Declare void __cp_pop_exception (void *), |
440 | as defined in exception.cc. */ | |
0c11ada6 JM |
441 | fn = push_void_library_fn |
442 | (fn, tree_cons (NULL_TREE, ptr_type_node, void_list_node)); | |
443 | /* This can throw if the destructor for the exception throws. */ | |
444 | TREE_NOTHROW (fn) = 0; | |
6874c264 | 445 | } |
72b7eeff MS |
446 | |
447 | /* Arrange to do a dynamically scoped cleanup upon exit from this region. */ | |
c7ae64f2 | 448 | cleanup = lookup_name (get_identifier ("__exception_info"), 0); |
e1b3e07d | 449 | cleanup = build_function_call (fn, tree_cons |
de35891e | 450 | (NULL_TREE, cleanup, NULL_TREE)); |
93ca4ba7 | 451 | TREE_NOTHROW (cleanup) = dtor_nothrow (type); |
c0700ea5 | 452 | return cleanup; |
c7ae64f2 JM |
453 | } |
454 | ||
455 | /* This routine creates the cleanup for the current exception. */ | |
72b7eeff | 456 | |
c7ae64f2 | 457 | static void |
93ca4ba7 JM |
458 | push_eh_cleanup (type) |
459 | tree type; | |
c7ae64f2 | 460 | { |
93ca4ba7 | 461 | finish_decl_cleanup (NULL_TREE, do_pop_exception (type)); |
c7ae64f2 | 462 | } |
72b7eeff | 463 | |
f4a23343 JM |
464 | /* Build up a call to terminate on the function obstack, for use as an |
465 | exception handler. */ | |
466 | ||
c6160f8f | 467 | static tree |
f4a23343 JM |
468 | build_terminate_handler () |
469 | { | |
80048418 | 470 | return build_function_call (terminate_node, NULL_TREE); |
f4a23343 JM |
471 | } |
472 | ||
e97f22c9 TT |
473 | /* Return nonzero value if DECL is a Java type suitable for catch or |
474 | throw. */ | |
475 | ||
476 | static int | |
477 | decl_is_java_type (decl, err) | |
478 | tree decl; | |
479 | int err; | |
480 | { | |
481 | int r = (TREE_CODE (decl) == POINTER_TYPE | |
482 | && TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE | |
483 | && TYPE_FOR_JAVA (TREE_TYPE (decl))); | |
484 | ||
485 | if (err) | |
486 | { | |
487 | if (TREE_CODE (decl) == REFERENCE_TYPE | |
488 | && TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE | |
489 | && TYPE_FOR_JAVA (TREE_TYPE (decl))) | |
490 | { | |
491 | /* Can't throw a reference. */ | |
492 | cp_error ("type `%T' is disallowed in Java `throw' or `catch'", | |
493 | decl); | |
494 | } | |
495 | ||
496 | if (r) | |
497 | { | |
498 | tree jthrow_node | |
499 | = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jthrowable")); | |
500 | if (jthrow_node == NULL_TREE) | |
501 | fatal ("call to Java `catch' or `throw', while `jthrowable' undefined"); | |
502 | jthrow_node = TREE_TYPE (TREE_TYPE (jthrow_node)); | |
503 | ||
504 | if (! DERIVED_FROM_P (jthrow_node, TREE_TYPE (decl))) | |
505 | { | |
506 | /* Thrown object must be a Throwable. */ | |
507 | cp_error ("type `%T' is not derived from `java::lang::Throwable'", | |
508 | TREE_TYPE (decl)); | |
509 | } | |
510 | } | |
511 | } | |
512 | ||
513 | return r; | |
514 | } | |
515 | ||
b35d4555 | 516 | /* Initialize the catch parameter DECL. */ |
6467930b | 517 | |
b35d4555 MM |
518 | static void |
519 | initialize_handler_parm (decl) | |
3c5c0849 | 520 | tree decl; |
8d08fdba | 521 | { |
b35d4555 MM |
522 | tree exp; |
523 | tree init; | |
524 | tree init_type; | |
e97f22c9 | 525 | int lang; |
b35d4555 MM |
526 | |
527 | /* Make sure we mark the catch param as used, otherwise we'll get a | |
528 | warning about an unused ((anonymous)). */ | |
529 | TREE_USED (decl) = 1; | |
530 | ||
531 | /* Figure out the type that the initializer is. */ | |
532 | init_type = TREE_TYPE (decl); | |
533 | if (TREE_CODE (init_type) != REFERENCE_TYPE | |
534 | && TREE_CODE (init_type) != POINTER_TYPE) | |
535 | init_type = build_reference_type (init_type); | |
536 | ||
e97f22c9 TT |
537 | if (decl_is_java_type (init_type, 0)) |
538 | { | |
539 | tree fn | |
540 | = builtin_function ("_Jv_exception_info", | |
541 | build_function_type (ptr_type_node, | |
542 | tree_cons (NULL_TREE, | |
543 | void_type_node, | |
544 | NULL_TREE)), | |
545 | 0, NOT_BUILT_IN, NULL_PTR); | |
546 | ||
547 | exp = build (CALL_EXPR, ptr_type_node, | |
548 | build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), | |
549 | fn), | |
550 | NULL_TREE, NULL_TREE); | |
551 | TREE_SIDE_EFFECTS (exp) = 1; | |
552 | lang = EH_LANG_Java; | |
553 | ||
554 | set_exception_lang_code (EH_LANG_Java); | |
555 | set_exception_version_code (1); | |
556 | } | |
557 | else | |
558 | { | |
559 | exp = get_eh_value (); | |
560 | lang = EH_LANG_C_plus_plus; | |
561 | } | |
562 | ||
563 | if (catch_language_init) | |
564 | { | |
565 | if (lang != catch_language) | |
566 | error ("mixing C++ and Java `catch'es in single translation unit"); | |
567 | } | |
568 | else | |
569 | { | |
570 | catch_language_init = 1; | |
571 | catch_language = lang; | |
572 | } | |
b35d4555 MM |
573 | |
574 | /* Since pointers are passed by value, initialize a reference to | |
575 | pointer catch parm with the address of the value slot. */ | |
576 | if (TREE_CODE (init_type) == REFERENCE_TYPE | |
577 | && TREE_CODE (TREE_TYPE (init_type)) == POINTER_TYPE) | |
578 | exp = build_unary_op (ADDR_EXPR, exp, 1); | |
579 | ||
580 | exp = ocp_convert (init_type , exp, CONV_IMPLICIT|CONV_FORCE_TEMP, 0); | |
581 | ||
582 | init = convert_from_reference (exp); | |
583 | ||
584 | /* If the constructor for the catch parm exits via an exception, we | |
585 | must call terminate. See eh23.C. */ | |
586 | if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))) | |
faf5394a | 587 | { |
b35d4555 MM |
588 | /* Generate the copy constructor call directly so we can wrap it. |
589 | See also expand_default_init. */ | |
590 | init = ocp_convert (TREE_TYPE (decl), init, | |
591 | CONV_IMPLICIT|CONV_FORCE_TEMP, 0); | |
592 | init = build (TRY_CATCH_EXPR, TREE_TYPE (init), init, | |
593 | build_terminate_handler ()); | |
faf5394a MS |
594 | } |
595 | ||
b35d4555 MM |
596 | /* Let `cp_finish_decl' know that this initializer is ok. */ |
597 | DECL_INITIAL (decl) = error_mark_node; | |
598 | decl = pushdecl (decl); | |
8d2733ca | 599 | |
b35d4555 | 600 | start_decl_1 (decl); |
cd9f6678 | 601 | cp_finish_decl (decl, init, NULL_TREE, |
b35d4555 | 602 | LOOKUP_ONLYCONVERTING|DIRECT_BIND); |
5816cb14 AM |
603 | } |
604 | ||
b35d4555 | 605 | /* Call this to start a catch block. DECL is the catch parameter. */ |
5816cb14 | 606 | |
b35d4555 MM |
607 | tree |
608 | expand_start_catch_block (decl) | |
3c5c0849 | 609 | tree decl; |
5816cb14 | 610 | { |
b35d4555 MM |
611 | tree compound_stmt_1; |
612 | tree compound_stmt_2; | |
5816cb14 | 613 | |
b35d4555 MM |
614 | if (! doing_eh (1)) |
615 | return NULL_TREE; | |
5816cb14 | 616 | |
b35d4555 | 617 | /* Make sure this declaration is reasonable. */ |
3c5c0849 MM |
618 | if (decl && !complete_ptr_ref_or_void_ptr_p (TREE_TYPE (decl), NULL_TREE)) |
619 | decl = NULL_TREE; | |
5816cb14 | 620 | |
b35d4555 MM |
621 | /* Create a binding level for the eh_info and the exception object |
622 | cleanup. */ | |
623 | compound_stmt_1 = begin_compound_stmt (/*has_no_scope=*/0); | |
624 | ||
e97f22c9 TT |
625 | if (! decl || ! decl_is_java_type (TREE_TYPE (decl), 1)) |
626 | { | |
627 | /* The ordinary C++ case. */ | |
93ca4ba7 | 628 | tree type; |
5816cb14 | 629 | |
e97f22c9 | 630 | if (decl) |
93ca4ba7 | 631 | type = TREE_TYPE (decl); |
e97f22c9 TT |
632 | else |
633 | type = NULL_TREE; | |
93ca4ba7 | 634 | begin_catch_block (build_eh_type_type_ref (type)); |
e97f22c9 TT |
635 | |
636 | push_eh_info (); | |
93ca4ba7 | 637 | push_eh_cleanup (type); |
e97f22c9 TT |
638 | } |
639 | else | |
640 | { | |
641 | /* The Java case. In this case, the match_info is a pointer to | |
642 | the Java class object. We assume that the class is a | |
643 | compiled class. */ | |
644 | tree ref = build_java_class_ref (TREE_TYPE (TREE_TYPE (decl))); | |
645 | begin_catch_block (build1 (ADDR_EXPR, jclass_node, ref)); | |
646 | } | |
5816cb14 | 647 | |
b35d4555 MM |
648 | /* Create a binding level for the parm. */ |
649 | compound_stmt_2 = begin_compound_stmt (/*has_no_scope=*/0); | |
5816cb14 | 650 | |
b35d4555 MM |
651 | if (decl) |
652 | initialize_handler_parm (decl); | |
5816cb14 | 653 | |
b35d4555 | 654 | return build_tree_list (compound_stmt_1, compound_stmt_2); |
5816cb14 AM |
655 | } |
656 | ||
f30432d7 | 657 | |
8d2733ca MS |
658 | /* Call this to end a catch block. Its responsible for emitting the |
659 | code to handle jumping back to the correct place, and for emitting | |
660 | the label to jump to if this catch block didn't match. */ | |
6467930b | 661 | |
824b9a4c | 662 | void |
b35d4555 MM |
663 | expand_end_catch_block (blocks) |
664 | tree blocks; | |
8d08fdba | 665 | { |
b35d4555 MM |
666 | tree compound_stmt_1 = blocks ? TREE_PURPOSE (blocks): NULL_TREE; |
667 | tree compound_stmt_2 = blocks ? TREE_VALUE (blocks): NULL_TREE; | |
668 | ||
f30432d7 MS |
669 | if (! doing_eh (1)) |
670 | return; | |
8d2733ca | 671 | |
0dde4175 JM |
672 | /* The exception being handled is rethrown if control reaches the end of |
673 | a handler of the function-try-block of a constructor or destructor. */ | |
674 | if (in_function_try_handler | |
675 | && (DECL_CONSTRUCTOR_P (current_function_decl) | |
676 | || DECL_DESTRUCTOR_P (current_function_decl))) | |
b35d4555 | 677 | finish_expr_stmt (build_throw (NULL_TREE)); |
0dde4175 | 678 | |
c7ae64f2 | 679 | /* Cleanup the EH parameter. */ |
b35d4555 | 680 | finish_compound_stmt (/*has_no_scope=*/0, compound_stmt_2); |
46e8c075 | 681 | /* Cleanup the EH object. */ |
4a6ef811 | 682 | finish_compound_stmt (/*has_no_scope=*/0, compound_stmt_1); |
8d2733ca | 683 | } |
8d08fdba | 684 | |
6c20b7e9 JM |
685 | /* An exception spec is implemented more or less like: |
686 | ||
687 | try { | |
688 | function body; | |
689 | } catch (...) { | |
690 | void *p[] = { typeid(raises) }; | |
691 | __check_eh_spec (p, count); | |
692 | } | |
693 | ||
694 | __check_eh_spec in exception.cc handles all the details. */ | |
8d2733ca | 695 | |
b35d4555 | 696 | tree |
f30432d7 MS |
697 | expand_start_eh_spec () |
698 | { | |
b35d4555 | 699 | return begin_try_block (); |
f30432d7 MS |
700 | } |
701 | ||
b35d4555 MM |
702 | void |
703 | expand_end_eh_spec (raises, try_block) | |
f30432d7 | 704 | tree raises; |
b35d4555 | 705 | tree try_block; |
f30432d7 | 706 | { |
6c20b7e9 | 707 | tree tmp, fn, decl, types = NULL_TREE; |
b35d4555 MM |
708 | tree blocks; |
709 | tree handler; | |
6c20b7e9 | 710 | int count = 0; |
f30432d7 | 711 | |
b35d4555 MM |
712 | finish_try_block (try_block); |
713 | handler = begin_handler (); | |
714 | blocks = finish_handler_parms (NULL_TREE, handler); | |
f30432d7 | 715 | |
1ef9f749 | 716 | if (TREE_VALUE (raises) == NULL_TREE) |
6c20b7e9 | 717 | { |
1ef9f749 JM |
718 | fn = get_identifier ("__check_null_eh_spec"); |
719 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
720 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
721 | else | |
722 | { | |
723 | tmp = build_function_type (void_type_node, void_list_node); | |
724 | fn = push_throw_library_fn (fn, tmp); | |
725 | /* Since the spec doesn't allow any exceptions, this call | |
726 | will never throw. */ | |
727 | TREE_NOTHROW (fn) = 1; | |
728 | } | |
729 | tmp = NULL_TREE; | |
6c20b7e9 | 730 | } |
1ef9f749 JM |
731 | else |
732 | { | |
733 | /* Build up an array of type_infos. */ | |
734 | for (; raises && TREE_VALUE (raises); raises = TREE_CHAIN (raises)) | |
735 | { | |
736 | types = tree_cons | |
737 | (NULL_TREE, build_eh_type_type (TREE_VALUE (raises)), types); | |
738 | ++count; | |
739 | } | |
eb66be0e | 740 | |
1ef9f749 JM |
741 | types = build_nt (CONSTRUCTOR, NULL_TREE, types); |
742 | TREE_HAS_CONSTRUCTOR (types) = 1; | |
6874c264 | 743 | |
1ef9f749 JM |
744 | /* We can't pass the CONSTRUCTOR directly, so stick it in a variable. */ |
745 | tmp = build_cplus_array_type (const_ptr_type_node, NULL_TREE); | |
746 | decl = build_decl (VAR_DECL, NULL_TREE, tmp); | |
747 | DECL_ARTIFICIAL (decl) = 1; | |
748 | DECL_INITIAL (decl) = types; | |
749 | DECL_CONTEXT (decl) = current_function_decl; | |
750 | cp_finish_decl (decl, types, NULL_TREE, 0); | |
6c20b7e9 | 751 | |
1ef9f749 | 752 | decl = decay_conversion (decl); |
6874c264 | 753 | |
1ef9f749 JM |
754 | fn = get_identifier ("__check_eh_spec"); |
755 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
756 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
757 | else | |
758 | { | |
759 | tmp = tree_cons | |
760 | (NULL_TREE, integer_type_node, tree_cons | |
761 | (NULL_TREE, TREE_TYPE (decl), void_list_node)); | |
762 | tmp = build_function_type (void_type_node, tmp); | |
763 | ||
764 | fn = push_throw_library_fn (fn, tmp); | |
765 | } | |
0c11ada6 | 766 | |
1ef9f749 JM |
767 | tmp = tree_cons (NULL_TREE, build_int_2 (count, 0), |
768 | tree_cons (NULL_TREE, decl, NULL_TREE)); | |
6c20b7e9 JM |
769 | } |
770 | ||
0c11ada6 | 771 | tmp = build_call (fn, tmp); |
b35d4555 | 772 | finish_expr_stmt (tmp); |
6c20b7e9 | 773 | |
b35d4555 MM |
774 | finish_handler (blocks, handler); |
775 | finish_handler_sequence (try_block); | |
f30432d7 MS |
776 | } |
777 | ||
8d2733ca MS |
778 | /* This is called to expand all the toplevel exception handling |
779 | finalization for a function. It should only be called once per | |
780 | function. */ | |
6467930b | 781 | |
8d08fdba | 782 | void |
8d2733ca | 783 | expand_exception_blocks () |
8d08fdba | 784 | { |
92b96838 | 785 | do_pending_stack_adjust (); |
eb448459 | 786 | |
e00737d2 | 787 | if (catch_clauses) |
f30432d7 | 788 | { |
e00737d2 MS |
789 | rtx funcend = gen_label_rtx (); |
790 | emit_jump (funcend); | |
791 | ||
eb66be0e MS |
792 | /* We cannot protect n regions this way if we must flow into the |
793 | EH region through the top of the region, as we have to with | |
794 | the setjmp/longjmp approach. */ | |
795 | if (exceptions_via_longjmp == 0) | |
fb98cff6 | 796 | expand_eh_region_start (); |
f30432d7 | 797 | |
e00737d2 | 798 | emit_insns (catch_clauses); |
c14f7160 | 799 | catch_clauses = catch_clauses_last = NULL_RTX; |
eb66be0e MS |
800 | |
801 | if (exceptions_via_longjmp == 0) | |
f4a23343 | 802 | expand_eh_region_end (build_terminate_handler ()); |
eb66be0e | 803 | |
4a6ef811 | 804 | emit_insns (catch_clauses); |
c14f7160 | 805 | catch_clauses = catch_clauses_last = NULL_RTX; |
e00737d2 MS |
806 | emit_label (funcend); |
807 | } | |
8d08fdba MS |
808 | } |
809 | ||
f4a23343 JM |
810 | /* Return a pointer to a buffer for an exception object of type TYPE. */ |
811 | ||
c6160f8f | 812 | static tree |
f4a23343 JM |
813 | alloc_eh_object (type) |
814 | tree type; | |
815 | { | |
816 | tree fn, exp; | |
817 | ||
818 | fn = get_identifier ("__eh_alloc"); | |
819 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
820 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
821 | else | |
822 | { | |
823 | /* Declare __eh_alloc (size_t), as defined in exception.cc. */ | |
0c11ada6 JM |
824 | tree tmp = tree_cons (NULL_TREE, sizetype, void_list_node); |
825 | fn = push_library_fn (fn, build_function_type (ptr_type_node, tmp)); | |
f4a23343 JM |
826 | } |
827 | ||
e1b3e07d | 828 | exp = build_function_call (fn, tree_cons |
f4a23343 JM |
829 | (NULL_TREE, size_in_bytes (type), NULL_TREE)); |
830 | exp = build1 (NOP_EXPR, build_pointer_type (type), exp); | |
831 | return exp; | |
832 | } | |
833 | ||
6467930b | 834 | /* Expand a throw statement. This follows the following |
8d2733ca MS |
835 | algorithm: |
836 | ||
837 | 1. Allocate space to save the current PC onto the stack. | |
838 | 2. Generate and emit a label and save its address into the | |
e1cd6e56 | 839 | newly allocated stack space since we can't save the pc directly. |
8d2733ca MS |
840 | 3. If this is the first call to throw in this function: |
841 | generate a label for the throw block | |
842 | 4. jump to the throw block label. */ | |
6467930b | 843 | |
225ff119 | 844 | static tree |
8d2733ca MS |
845 | expand_throw (exp) |
846 | tree exp; | |
8d08fdba | 847 | { |
6874c264 | 848 | tree fn; |
8d08fdba | 849 | |
8d2733ca | 850 | if (! doing_eh (1)) |
59ccf49d | 851 | return error_mark_node; |
8d08fdba | 852 | |
e97f22c9 TT |
853 | if (exp |
854 | && decl_is_java_type (TREE_TYPE (exp), 1)) | |
855 | { | |
856 | /* A Java `throw' statement. */ | |
857 | tree args = tree_cons (NULL_TREE, exp, NULL); | |
858 | ||
859 | fn = get_identifier (exceptions_via_longjmp | |
d9420976 | 860 | ? "_Jv_Sjlj_Throw" |
e97f22c9 TT |
861 | : "_Jv_Throw"); |
862 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
863 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
864 | else | |
865 | { | |
866 | /* Declare _Jv_Throw (void *), as defined in Java's | |
867 | exception.cc. */ | |
0c11ada6 JM |
868 | tree tmp = tree_cons (NULL_TREE, ptr_type_node, void_list_node); |
869 | tmp = build_function_type (ptr_type_node, tmp); | |
870 | fn = push_library_fn (fn, tmp); | |
12a22e76 | 871 | TREE_THIS_VOLATILE (fn) = 1; |
0c11ada6 | 872 | TREE_NOTHROW (fn) = 0; |
e97f22c9 TT |
873 | } |
874 | ||
875 | exp = build_function_call (fn, args); | |
876 | } | |
877 | else if (exp) | |
8d2733ca | 878 | { |
faae18ab | 879 | tree throw_type; |
6874c264 | 880 | tree cleanup = NULL_TREE, e; |
59ccf49d MM |
881 | tree stmt_expr; |
882 | tree compound_stmt; | |
883 | tree try_block; | |
884 | ||
885 | begin_init_stmts (&stmt_expr, &compound_stmt); | |
faae18ab | 886 | |
a3b49ccd | 887 | /* throw expression */ |
e92cc029 | 888 | /* First, decay it. */ |
f30432d7 | 889 | exp = decay_conversion (exp); |
a3b49ccd | 890 | |
298d6f60 MM |
891 | /* The CLEANUP_TYPE is the internal type of a destructor. Under |
892 | the old ABI, destructors are two-argument functions; under | |
893 | the new ABI they take only one argument. */ | |
6874c264 | 894 | if (cleanup_type == NULL_TREE) |
298d6f60 MM |
895 | { |
896 | tree arg_types; | |
897 | ||
898 | arg_types = void_list_node; | |
899 | if (!flag_new_abi) | |
900 | arg_types = tree_cons (NULL_TREE, integer_type_node, arg_types); | |
901 | arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types); | |
902 | cleanup_type = (build_pointer_type | |
903 | (build_function_type (void_type_node, arg_types))); | |
904 | } | |
6874c264 | 905 | |
08b24bda | 906 | if (TYPE_PTR_P (TREE_TYPE (exp))) |
db48b831 | 907 | throw_type = build_eh_type_type (TREE_TYPE (exp)); |
f30432d7 MS |
908 | else |
909 | { | |
f4a23343 JM |
910 | tree object, ptr; |
911 | ||
cab1f180 | 912 | /* OK, this is kind of wacky. The standard says that we call |
46e8c075 MM |
913 | terminate when the exception handling mechanism, after |
914 | completing evaluation of the expression to be thrown but | |
915 | before the exception is caught (_except.throw_), calls a | |
916 | user function that exits via an uncaught exception. | |
f4a23343 JM |
917 | |
918 | So we have to protect the actual initialization of the | |
919 | exception object with terminate(), but evaluate the expression | |
920 | first. We also expand the call to __eh_alloc | |
921 | first. Since there could be temps in the expression, we need | |
922 | to handle that, too. */ | |
a50f0918 | 923 | |
59ccf49d | 924 | my_friendly_assert (stmts_are_full_exprs_p == 1, 19990926); |
f4a23343 | 925 | |
f4a23343 JM |
926 | /* Store the throw expression into a temp. This can be less |
927 | efficient than storing it into the allocated space directly, but | |
928 | oh well. To do this efficiently we would need to insinuate | |
929 | ourselves into expand_call. */ | |
930 | if (TREE_SIDE_EFFECTS (exp)) | |
931 | { | |
f1dedc31 | 932 | tree temp = create_temporary_var (TREE_TYPE (exp)); |
c37dc68e | 933 | DECL_INITIAL (temp) = exp; |
cd9f6678 | 934 | cp_finish_decl (temp, exp, NULL_TREE, LOOKUP_ONLYCONVERTING); |
f4a23343 JM |
935 | exp = temp; |
936 | } | |
f4a23343 JM |
937 | |
938 | /* Allocate the space for the exception. */ | |
939 | ptr = save_expr (alloc_eh_object (TREE_TYPE (exp))); | |
59ccf49d | 940 | finish_expr_stmt (ptr); |
f4a23343 | 941 | |
59ccf49d | 942 | try_block = begin_try_block (); |
f4a23343 JM |
943 | object = build_indirect_ref (ptr, NULL_PTR); |
944 | exp = build_modify_expr (object, INIT_EXPR, exp); | |
faae18ab | 945 | |
f30432d7 | 946 | if (exp == error_mark_node) |
8251199e | 947 | error (" in thrown expression"); |
faae18ab | 948 | |
59ccf49d MM |
949 | finish_expr_stmt (exp); |
950 | finish_cleanup_try_block (try_block); | |
951 | finish_cleanup (build_terminate_handler (), try_block); | |
f4a23343 | 952 | |
db48b831 | 953 | throw_type = build_eh_type_type (TREE_TYPE (object)); |
72b7eeff | 954 | |
6874c264 JM |
955 | if (TYPE_HAS_DESTRUCTOR (TREE_TYPE (object))) |
956 | { | |
957 | cleanup = lookup_fnfields (TYPE_BINFO (TREE_TYPE (object)), | |
298d6f60 MM |
958 | (flag_new_abi |
959 | ? complete_dtor_identifier | |
960 | : dtor_identifier), | |
961 | 0); | |
6874c264 | 962 | cleanup = TREE_VALUE (cleanup); |
e872bb7a | 963 | mark_used (cleanup); |
6874c264 JM |
964 | mark_addressable (cleanup); |
965 | /* Pretend it's a normal function. */ | |
966 | cleanup = build1 (ADDR_EXPR, cleanup_type, cleanup); | |
967 | } | |
f4a23343 JM |
968 | |
969 | exp = ptr; | |
f30432d7 | 970 | } |
faae18ab | 971 | |
bbeeb2b0 MM |
972 | /* Cast EXP to `void *' so that it will match the prototype for |
973 | __cp_push_exception. */ | |
c37dc68e | 974 | exp = convert (ptr_type_node, exp); |
bbeeb2b0 | 975 | |
6874c264 JM |
976 | if (cleanup == NULL_TREE) |
977 | { | |
978 | cleanup = build_int_2 (0, 0); | |
979 | TREE_TYPE (cleanup) = cleanup_type; | |
980 | } | |
72b7eeff | 981 | |
298d6f60 | 982 | fn = cp_push_exception_identifier; |
6874c264 JM |
983 | if (IDENTIFIER_GLOBAL_VALUE (fn)) |
984 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
985 | else | |
986 | { | |
987 | /* Declare __cp_push_exception (void*, void*, void (*)(void*, int)), | |
988 | as defined in exception.cc. */ | |
989 | tree tmp; | |
6874c264 JM |
990 | tmp = tree_cons |
991 | (NULL_TREE, ptr_type_node, tree_cons | |
992 | (NULL_TREE, ptr_type_node, tree_cons | |
993 | (NULL_TREE, cleanup_type, void_list_node))); | |
0c11ada6 | 994 | fn = push_void_library_fn (fn, tmp); |
6874c264 | 995 | } |
72b7eeff | 996 | |
e1b3e07d MM |
997 | e = tree_cons (NULL_TREE, exp, tree_cons |
998 | (NULL_TREE, throw_type, tree_cons | |
999 | (NULL_TREE, cleanup, NULL_TREE))); | |
59ccf49d MM |
1000 | finish_expr_stmt (build_function_call (fn, e)); |
1001 | ||
1002 | exp = finish_init_stmts (stmt_expr, compound_stmt); | |
8d2733ca MS |
1003 | } |
1004 | else | |
a3b49ccd | 1005 | { |
6874c264 JM |
1006 | /* rethrow current exception; note that it's no longer caught. */ |
1007 | ||
1008 | tree fn = get_identifier ("__uncatch_exception"); | |
1009 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
1010 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
1011 | else | |
0c11ada6 JM |
1012 | /* Declare void __uncatch_exception (void) |
1013 | as defined in exception.cc. */ | |
1014 | fn = push_void_library_fn (fn, void_list_node); | |
6874c264 JM |
1015 | |
1016 | exp = build_function_call (fn, NULL_TREE); | |
a3b49ccd | 1017 | } |
8d2733ca | 1018 | |
59ccf49d | 1019 | return exp; |
f376e137 | 1020 | } |
8d2733ca MS |
1021 | |
1022 | /* Build a throw expression. */ | |
6467930b | 1023 | |
8d2733ca MS |
1024 | tree |
1025 | build_throw (e) | |
1026 | tree e; | |
1027 | { | |
02020185 JM |
1028 | if (e == error_mark_node) |
1029 | return e; | |
1030 | ||
1031 | if (processing_template_decl) | |
1032 | return build_min (THROW_EXPR, void_type_node, e); | |
1033 | ||
e0f9a8bc | 1034 | if (e == null_node) |
8251199e | 1035 | cp_warning ("throwing NULL, which has integral, not pointer type"); |
980c394c NS |
1036 | |
1037 | if (e != NULL_TREE) | |
1038 | { | |
4cfbc546 NS |
1039 | if (!complete_ptr_ref_or_void_ptr_p (TREE_TYPE (e), e)) |
1040 | return error_mark_node; | |
980c394c | 1041 | } |
02020185 | 1042 | |
59ccf49d | 1043 | e = expand_throw (e); |
02020185 JM |
1044 | e = build1 (THROW_EXPR, void_type_node, e); |
1045 | TREE_SIDE_EFFECTS (e) = 1; | |
1046 | TREE_USED (e) = 1; | |
1047 | ||
8d2733ca | 1048 | return e; |
8d08fdba | 1049 | } |
4cfbc546 NS |
1050 | |
1051 | /* Make sure TYPE is complete, pointer to complete, reference to | |
1052 | complete, or pointer to cv void. Issue diagnostic on failure. | |
1053 | Return the zero on failure and non-zero on success. FROM can be | |
1054 | the expr or decl from whence TYPE came, if available. */ | |
1055 | ||
1056 | static int | |
1057 | complete_ptr_ref_or_void_ptr_p (type, from) | |
1058 | tree type; | |
1059 | tree from; | |
1060 | { | |
1061 | int is_ptr; | |
1062 | ||
1063 | /* Check complete. */ | |
1064 | type = complete_type_or_else (type, from); | |
1065 | if (!type) | |
1066 | return 0; | |
1067 | ||
1068 | /* Or a pointer or ref to one, or cv void *. */ | |
1069 | is_ptr = TREE_CODE (type) == POINTER_TYPE; | |
1070 | if (is_ptr || TREE_CODE (type) == REFERENCE_TYPE) | |
1071 | { | |
1072 | tree core = TREE_TYPE (type); | |
1073 | ||
1074 | if (is_ptr && same_type_p (TYPE_MAIN_VARIANT (core), void_type_node)) | |
1075 | /* OK */; | |
1076 | else if (!complete_type_or_else (core, from)) | |
1077 | return 0; | |
1078 | } | |
1079 | return 1; | |
1080 | } | |
1081 | ||
1660cb3a JM |
1082 | /* Returns nonzero if FN is a declaration of a standard C library |
1083 | function which is known not to throw. | |
1084 | ||
1085 | [lib.res.on.exception.handling]: None of the functions from the | |
1086 | Standard C library shall report an error by throwing an | |
1087 | exception, unless it calls a program-supplied function that | |
1088 | throws an exception. */ | |
1089 | ||
1090 | #include "cfns.h" | |
1091 | ||
1092 | int | |
1093 | nothrow_libfn_p (fn) | |
1094 | tree fn; | |
1095 | { | |
1096 | tree id; | |
1097 | ||
1098 | if (TREE_PUBLIC (fn) | |
1099 | && DECL_EXTERNAL (fn) | |
eb68cb58 | 1100 | && DECL_EXTERN_C_P (fn)) |
1660cb3a JM |
1101 | /* OK */; |
1102 | else | |
1103 | /* Can't be a C library function. */ | |
1104 | return 0; | |
1105 | ||
1106 | id = DECL_ASSEMBLER_NAME (fn); | |
1107 | return !!libc_name_p (IDENTIFIER_POINTER (id), IDENTIFIER_LENGTH (id)); | |
1108 | } | |
2bc9f1d1 JM |
1109 | |
1110 | /* Returns nonzero if an exception of type FROM will be caught by a | |
1111 | handler for type TO, as per [except.handle]. */ | |
1112 | ||
1113 | static int | |
1114 | can_convert_eh (to, from) | |
1115 | tree to, from; | |
1116 | { | |
1117 | if (TREE_CODE (to) == REFERENCE_TYPE) | |
1118 | to = TREE_TYPE (to); | |
1119 | if (TREE_CODE (from) == REFERENCE_TYPE) | |
1120 | from = TREE_TYPE (from); | |
1121 | ||
1122 | if (TREE_CODE (to) == POINTER_TYPE && TREE_CODE (from) == POINTER_TYPE) | |
1123 | { | |
1124 | to = TREE_TYPE (to); | |
1125 | from = TREE_TYPE (from); | |
1126 | ||
1127 | if (! at_least_as_qualified_p (to, from)) | |
1128 | return 0; | |
1129 | ||
1130 | if (TREE_CODE (to) == VOID_TYPE) | |
1131 | return 1; | |
1132 | ||
1133 | /* else fall through */ | |
1134 | } | |
1135 | ||
1136 | if (IS_AGGR_TYPE (to) && IS_AGGR_TYPE (from) | |
1137 | && PUBLICLY_UNIQUELY_DERIVED_P (to, from)) | |
1138 | return 1; | |
1139 | ||
1140 | return 0; | |
1141 | } | |
1142 | ||
1143 | /* Check whether any of HANDLERS are shadowed by another handler accepting | |
1144 | TYPE. Note that the shadowing may not be complete; even if an exception | |
1145 | of type B would be caught by a handler for A, there could be a derived | |
1146 | class C for which A is an ambiguous base but B is not, so the handler | |
1147 | for B would catch an exception of type C. */ | |
1148 | ||
1149 | static void | |
1150 | check_handlers_1 (master, handlers) | |
1151 | tree master; | |
1152 | tree handlers; | |
1153 | { | |
1154 | tree type = TREE_TYPE (master); | |
1155 | tree handler; | |
1156 | ||
1157 | for (handler = handlers; handler; handler = TREE_CHAIN (handler)) | |
1158 | if (TREE_TYPE (handler) | |
1159 | && can_convert_eh (type, TREE_TYPE (handler))) | |
1160 | { | |
1161 | lineno = STMT_LINENO (handler); | |
1162 | cp_warning ("exception of type `%T' will be caught", | |
1163 | TREE_TYPE (handler)); | |
1164 | lineno = STMT_LINENO (master); | |
1165 | cp_warning (" by earlier handler for `%T'", type); | |
1166 | break; | |
1167 | } | |
1168 | } | |
1169 | ||
1170 | /* Given a chain of HANDLERs, make sure that they're OK. */ | |
1171 | ||
1172 | void | |
1173 | check_handlers (handlers) | |
1174 | tree handlers; | |
1175 | { | |
1176 | tree handler; | |
1177 | int save_line = lineno; | |
1178 | for (handler = handlers; handler; handler = TREE_CHAIN (handler)) | |
1179 | { | |
1180 | if (TREE_CHAIN (handler) == NULL_TREE) | |
1181 | /* No more handlers; nothing to shadow. */; | |
1182 | else if (TREE_TYPE (handler) == NULL_TREE) | |
1183 | { | |
1184 | lineno = STMT_LINENO (handler); | |
1185 | cp_pedwarn | |
1186 | ("`...' handler must be the last handler for its try block"); | |
1187 | } | |
1188 | else | |
1189 | check_handlers_1 (handler, TREE_CHAIN (handler)); | |
1190 | } | |
1191 | lineno = save_line; | |
1192 | } |