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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 | |
158991b7 KG |
40 | static void push_eh_cleanup PARAMS ((void)); |
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 |
158991b7 KG |
51 | static tree do_pop_exception PARAMS ((void)); |
52 | static tree build_eh_type_type_ref PARAMS ((tree)); | |
53 | static tree build_terminate_handler PARAMS ((void)); | |
54 | static tree alloc_eh_object PARAMS ((tree)); | |
55 | static int complete_ptr_ref_or_void_ptr_p PARAMS ((tree, tree)); | |
56 | static void initialize_handler_parm PARAMS ((tree)); | |
57 | static tree expand_throw PARAMS ((tree)); | |
e97f22c9 | 58 | static int decl_is_java_type PARAMS ((tree decl, int err)); |
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 | 95 | |
e97f22c9 TT |
96 | /* In a given translation unit we are constrained to catch only C++ |
97 | types or only Java types. `catch_language' holds the current type, | |
98 | and `catch_language_init' registers whether `catch_language' has | |
99 | been set. */ | |
100 | ||
101 | static int catch_language_init = 0; | |
102 | static int catch_language; | |
103 | ||
8d2733ca MS |
104 | /* ====================================================================== |
105 | Briefly the algorithm works like this: | |
106 | ||
107 | When a constructor or start of a try block is encountered, | |
108 | push_eh_entry (&eh_stack) is called. Push_eh_entry () creates a | |
109 | new entry in the unwind protection stack and returns a label to | |
110 | output to start the protection for that block. | |
111 | ||
112 | When a destructor or end try block is encountered, pop_eh_entry | |
6467930b MS |
113 | (&eh_stack) is called. Pop_eh_entry () returns the eh_entry it |
114 | created when push_eh_entry () was called. The eh_entry structure | |
8d2733ca MS |
115 | contains three things at this point. The start protect label, |
116 | the end protect label, and the exception handler label. The end | |
117 | protect label should be output before the call to the destructor | |
118 | (if any). If it was a destructor, then its parse tree is stored | |
6467930b | 119 | in the finalization variable in the eh_entry structure. Otherwise |
8d2733ca | 120 | the finalization variable is set to NULL to reflect the fact that |
38e01259 | 121 | it is the end of a try block. Next, this modified eh_entry node |
8d2733ca MS |
122 | is enqueued in the finalizations queue by calling |
123 | enqueue_eh_entry (&queue,entry). | |
124 | ||
125 | +---------------------------------------------------------------+ | |
126 | |XXX: Will need modification to deal with partially | | |
127 | | constructed arrays of objects | | |
128 | | | | |
129 | | Basically, this consists of keeping track of how many | | |
130 | | of the objects have been constructed already (this | | |
131 | | should be in a register though, so that shouldn't be a | | |
132 | | problem. | | |
133 | +---------------------------------------------------------------+ | |
134 | ||
135 | When a catch block is encountered, there is a lot of work to be | |
136 | done. | |
137 | ||
138 | Since we don't want to generate the catch block inline with the | |
139 | regular flow of the function, we need to have some way of doing | |
f30432d7 MS |
140 | so. Luckily, we can use sequences to defer the catch sections. |
141 | When the start of a catch block is encountered, we start the | |
142 | sequence. After the catch block is generated, we end the | |
143 | sequence. | |
144 | ||
8d2733ca MS |
145 | Next we must insure that when the catch block is executed, all |
146 | finalizations for the matching try block have been completed. If | |
147 | any of those finalizations throw an exception, we must call | |
148 | terminate according to the ARM (section r.15.6.1). What this | |
149 | means is that we need to dequeue and emit finalizations for each | |
6467930b | 150 | entry in the eh_queue until we get to an entry with a NULL |
8d2733ca MS |
151 | finalization field. For any of the finalization entries, if it |
152 | is not a call to terminate (), we must protect it by giving it | |
153 | another start label, end label, and exception handler label, | |
154 | setting its finalization tree to be a call to terminate (), and | |
6467930b | 155 | enqueue'ing this new eh_entry to be output at an outer level. |
8d2733ca MS |
156 | Finally, after all that is done, we can get around to outputting |
157 | the catch block which basically wraps all the "catch (...) {...}" | |
158 | statements in a big if/then/else construct that matches the | |
159 | correct block to call. | |
160 | ||
161 | ===================================================================== */ | |
162 | ||
8d2733ca MS |
163 | /* ====================================================================== */ |
164 | ||
8d2733ca | 165 | /* sets up all the global eh stuff that needs to be initialized at the |
bbd0d54a | 166 | start of compilation. */ |
8d08fdba | 167 | |
8d08fdba | 168 | void |
8d2733ca | 169 | init_exception_processing () |
8d08fdba | 170 | { |
6633d636 MS |
171 | /* void vtype () */ |
172 | tree vtype = build_function_type (void_type_node, void_list_node); | |
173 | ||
2c73f9f5 ML |
174 | if (flag_honor_std) |
175 | push_namespace (get_identifier ("std")); | |
c2a37c55 | 176 | terminate_node = auto_function (get_identifier ("terminate"), vtype); |
9cd64686 | 177 | TREE_THIS_VOLATILE (terminate_node) = 1; |
2c73f9f5 ML |
178 | if (flag_honor_std) |
179 | pop_namespace (); | |
8ccc31eb | 180 | |
9a0d1e1b AM |
181 | set_exception_lang_code (EH_LANG_C_plus_plus); |
182 | set_exception_version_code (1); | |
9a0d1e1b | 183 | |
eb66be0e MS |
184 | /* If we use setjmp/longjmp EH, arrange for all cleanup actions to |
185 | be protected with __terminate. */ | |
186 | protect_cleanup_actions_with_terminate = 1; | |
8d2733ca MS |
187 | } |
188 | ||
95e8dcba | 189 | /* Retrieve a pointer to the cp_eh_info node for the current exception. */ |
6874c264 | 190 | |
95e8dcba JM |
191 | static tree |
192 | call_eh_info () | |
6874c264 | 193 | { |
95e8dcba | 194 | tree fn; |
6874c264 | 195 | |
e6cfb550 | 196 | fn = get_identifier ("__start_cp_handler"); |
6874c264 JM |
197 | if (IDENTIFIER_GLOBAL_VALUE (fn)) |
198 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
199 | else | |
200 | { | |
a1622f83 | 201 | tree t1, t, fields[7]; |
6874c264 | 202 | |
e6cfb550 | 203 | /* Declare cp_eh_info * __start_cp_handler (void), |
6874c264 | 204 | as defined in exception.cc. */ |
6874c264 JM |
205 | |
206 | /* struct cp_eh_info. This must match exception.cc. Note that this | |
207 | type is not pushed anywhere. */ | |
33848bb0 | 208 | t1= make_aggr_type (RECORD_TYPE); |
4ce3d537 | 209 | fields[0] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 210 | get_identifier ("handler_label"), ptr_type_node); |
4ce3d537 | 211 | fields[1] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 212 | get_identifier ("dynamic_handler_chain"), ptr_type_node); |
4ce3d537 | 213 | fields[2] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 214 | get_identifier ("info"), ptr_type_node); |
4ce3d537 | 215 | fields[3] = build_lang_decl (FIELD_DECL, |
e6cfb550 | 216 | get_identifier ("table_index"), ptr_type_node); |
9a0d1e1b AM |
217 | /* N.B.: The fourth field LEN is expected to be |
218 | the number of fields - 1, not the total number of fields. */ | |
e6cfb550 | 219 | finish_builtin_type (t1, "eh_context", fields, 3, ptr_type_node); |
9a0d1e1b AM |
220 | t1 = build_pointer_type (t1); |
221 | ||
33848bb0 | 222 | t1= make_aggr_type (RECORD_TYPE); |
4ce3d537 | 223 | fields[0] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 224 | get_identifier ("match_function"), ptr_type_node); |
4ce3d537 | 225 | fields[1] = build_lang_decl (FIELD_DECL, |
9a0d1e1b | 226 | get_identifier ("language"), short_integer_type_node); |
4ce3d537 | 227 | fields[2] = build_lang_decl (FIELD_DECL, |
9a0d1e1b AM |
228 | get_identifier ("version"), short_integer_type_node); |
229 | /* N.B.: The fourth field LEN is expected to be | |
230 | the number of fields - 1, not the total number of fields. */ | |
5816cb14 | 231 | finish_builtin_type (t1, "__eh_info", fields, 2, ptr_type_node); |
33848bb0 | 232 | t = make_aggr_type (RECORD_TYPE); |
4ce3d537 MM |
233 | fields[0] = build_lang_decl (FIELD_DECL, |
234 | get_identifier ("eh_info"), t1); | |
235 | fields[1] = build_lang_decl (FIELD_DECL, get_identifier ("value"), | |
236 | ptr_type_node); | |
237 | fields[2] = build_lang_decl (FIELD_DECL, get_identifier ("type"), | |
238 | ptr_type_node); | |
239 | fields[3] = build_lang_decl | |
6874c264 JM |
240 | (FIELD_DECL, get_identifier ("cleanup"), |
241 | build_pointer_type (build_function_type | |
242 | (ptr_type_node, tree_cons | |
243 | (NULL_TREE, ptr_type_node, void_list_node)))); | |
4ce3d537 MM |
244 | fields[4] = build_lang_decl (FIELD_DECL, get_identifier ("caught"), |
245 | boolean_type_node); | |
246 | fields[5] = build_lang_decl (FIELD_DECL, get_identifier ("next"), | |
247 | build_pointer_type (t)); | |
248 | fields[6] = build_lang_decl | |
20b90169 | 249 | (FIELD_DECL, get_identifier ("handlers"), long_integer_type_node); |
cf9d67e3 BK |
250 | /* N.B.: The fourth field LEN is expected to be |
251 | the number of fields - 1, not the total number of fields. */ | |
a1622f83 | 252 | finish_builtin_type (t, "cp_eh_info", fields, 6, ptr_type_node); |
6874c264 JM |
253 | t = build_pointer_type (t); |
254 | ||
255 | /* And now the function. */ | |
256 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
257 | build_function_type (t, void_list_node)); | |
258 | DECL_EXTERNAL (fn) = 1; | |
259 | TREE_PUBLIC (fn) = 1; | |
260 | DECL_ARTIFICIAL (fn) = 1; | |
12a22e76 | 261 | TREE_NOTHROW (fn) = 1; |
6874c264 JM |
262 | pushdecl_top_level (fn); |
263 | make_function_rtl (fn); | |
6874c264 | 264 | } |
a6ecf8b6 | 265 | mark_used (fn); |
95e8dcba JM |
266 | return build_function_call (fn, NULL_TREE); |
267 | } | |
268 | ||
269 | /* Retrieve a pointer to the cp_eh_info node for the current exception | |
270 | and save it in the current binding level. */ | |
271 | ||
272 | static void | |
273 | push_eh_info () | |
274 | { | |
275 | tree decl, fn = call_eh_info (); | |
6874c264 JM |
276 | |
277 | /* Remember the pointer to the current exception info; it won't change | |
278 | during this catch block. */ | |
279 | decl = build_decl (VAR_DECL, get_identifier ("__exception_info"), | |
280 | TREE_TYPE (fn)); | |
281 | DECL_ARTIFICIAL (decl) = 1; | |
282 | DECL_INITIAL (decl) = fn; | |
283 | decl = pushdecl (decl); | |
cd9f6678 | 284 | cp_finish_decl (decl, fn, NULL_TREE, 0); |
6874c264 JM |
285 | } |
286 | ||
287 | /* Returns a reference to the cp_eh_info node for the current exception. */ | |
288 | ||
289 | static tree | |
290 | get_eh_info () | |
291 | { | |
292 | /* Look for the pointer pushed in push_eh_info. */ | |
293 | tree t = lookup_name (get_identifier ("__exception_info"), 0); | |
294 | return build_indirect_ref (t, NULL_PTR); | |
295 | } | |
296 | ||
297 | /* Returns a reference to the current exception object. */ | |
298 | ||
299 | static tree | |
300 | get_eh_value () | |
301 | { | |
302 | return build_component_ref (get_eh_info (), get_identifier ("value"), | |
303 | NULL_TREE, 0); | |
304 | } | |
305 | ||
306 | /* Returns a reference to the current exception type. */ | |
307 | ||
87603ed0 | 308 | #if 0 |
6874c264 JM |
309 | static tree |
310 | get_eh_type () | |
311 | { | |
312 | return build_component_ref (get_eh_info (), get_identifier ("type"), | |
313 | NULL_TREE, 0); | |
314 | } | |
315 | ||
316 | /* Returns a reference to whether or not the current exception | |
317 | has been caught. */ | |
318 | ||
319 | static tree | |
320 | get_eh_caught () | |
321 | { | |
322 | return build_component_ref (get_eh_info (), get_identifier ("caught"), | |
323 | NULL_TREE, 0); | |
324 | } | |
325 | ||
20b90169 JM |
326 | /* Returns a reference to whether or not the current exception |
327 | has been caught. */ | |
328 | ||
329 | static tree | |
330 | get_eh_handlers () | |
331 | { | |
332 | return build_component_ref (get_eh_info (), get_identifier ("handlers"), | |
333 | NULL_TREE, 0); | |
334 | } | |
e833cb11 | 335 | #endif |
20b90169 | 336 | |
f30432d7 MS |
337 | /* Build a type value for use at runtime for a type that is matched |
338 | against by the exception handling system. */ | |
6467930b | 339 | |
f30432d7 MS |
340 | static tree |
341 | build_eh_type_type (type) | |
342 | tree type; | |
8d08fdba | 343 | { |
f30432d7 MS |
344 | if (type == error_mark_node) |
345 | return error_mark_node; | |
8d2733ca | 346 | |
e92cc029 | 347 | /* peel back references, so they match. */ |
f30432d7 MS |
348 | if (TREE_CODE (type) == REFERENCE_TYPE) |
349 | type = TREE_TYPE (type); | |
8d08fdba | 350 | |
e92cc029 | 351 | /* Peel off cv qualifiers. */ |
f30432d7 | 352 | type = TYPE_MAIN_VARIANT (type); |
8d2733ca | 353 | |
db48b831 | 354 | return build1 (ADDR_EXPR, ptr_type_node, get_typeid_1 (type)); |
8d08fdba | 355 | } |
8d08fdba | 356 | |
e5f614d7 | 357 | /* Build the address of a typeinfo decl for use in the runtime |
db48b831 | 358 | matching field of the new exception model */ |
5816cb14 AM |
359 | |
360 | static tree | |
361 | build_eh_type_type_ref (type) | |
362 | tree type; | |
363 | { | |
5816cb14 | 364 | tree exp; |
5816cb14 AM |
365 | |
366 | if (type == error_mark_node) | |
367 | return error_mark_node; | |
368 | ||
369 | /* peel back references, so they match. */ | |
370 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
371 | type = TREE_TYPE (type); | |
372 | ||
373 | /* Peel off cv qualifiers. */ | |
374 | type = TYPE_MAIN_VARIANT (type); | |
375 | ||
e5f614d7 NS |
376 | exp = get_tinfo_decl (type); |
377 | mark_used (exp); | |
db48b831 | 378 | exp = build1 (ADDR_EXPR, ptr_type_node, exp); |
5816cb14 | 379 | |
5816cb14 AM |
380 | return (exp); |
381 | } | |
382 | ||
9c606f69 | 383 | /* This routine is called to mark all the symbols representing runtime |
ae673f14 | 384 | type functions in the exception table as having been referenced. |
9c606f69 AM |
385 | This will make sure code is emitted for them. Called from finish_file. */ |
386 | void | |
387 | mark_all_runtime_matches () | |
388 | { | |
389 | int x,num; | |
390 | void **ptr; | |
391 | tree exp; | |
392 | ||
393 | num = find_all_handler_type_matches (&ptr); | |
394 | if (num == 0 || ptr == NULL) | |
395 | return; | |
396 | ||
397 | for (x=0; x <num; x++) | |
398 | { | |
399 | exp = (tree) ptr[x]; | |
400 | if (TREE_CODE (exp) == ADDR_EXPR) | |
401 | { | |
402 | exp = TREE_OPERAND (exp, 0); | |
403 | if (TREE_CODE (exp) == FUNCTION_DECL) | |
404 | TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (exp)) = 1; | |
405 | } | |
406 | } | |
407 | ||
408 | free (ptr); | |
409 | } | |
410 | ||
c7ae64f2 JM |
411 | /* Build up a call to __cp_pop_exception, to destroy the exception object |
412 | for the current catch block. HANDLER is either true or false, telling | |
413 | the library whether or not it is being called from an exception handler; | |
414 | if it is, it avoids destroying the object on rethrow. */ | |
6467930b | 415 | |
c7ae64f2 | 416 | static tree |
de35891e | 417 | do_pop_exception () |
72b7eeff | 418 | { |
6874c264 | 419 | tree fn, cleanup; |
6874c264 JM |
420 | fn = get_identifier ("__cp_pop_exception"); |
421 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
422 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
423 | else | |
424 | { | |
c7ae64f2 JM |
425 | /* Declare void __cp_pop_exception (void *), |
426 | as defined in exception.cc. */ | |
c7ae64f2 JM |
427 | fn = build_lang_decl |
428 | (FUNCTION_DECL, fn, | |
429 | build_function_type (void_type_node, tree_cons | |
de35891e | 430 | (NULL_TREE, ptr_type_node, void_list_node))); |
6874c264 JM |
431 | DECL_EXTERNAL (fn) = 1; |
432 | TREE_PUBLIC (fn) = 1; | |
433 | DECL_ARTIFICIAL (fn) = 1; | |
434 | pushdecl_top_level (fn); | |
435 | make_function_rtl (fn); | |
6874c264 | 436 | } |
72b7eeff | 437 | |
a6ecf8b6 | 438 | mark_used (fn); |
72b7eeff | 439 | /* Arrange to do a dynamically scoped cleanup upon exit from this region. */ |
c7ae64f2 | 440 | cleanup = lookup_name (get_identifier ("__exception_info"), 0); |
e1b3e07d | 441 | cleanup = build_function_call (fn, tree_cons |
de35891e | 442 | (NULL_TREE, cleanup, NULL_TREE)); |
c0700ea5 | 443 | return cleanup; |
c7ae64f2 JM |
444 | } |
445 | ||
446 | /* This routine creates the cleanup for the current exception. */ | |
72b7eeff | 447 | |
c7ae64f2 JM |
448 | static void |
449 | push_eh_cleanup () | |
450 | { | |
b35d4555 | 451 | finish_decl_cleanup (NULL_TREE, do_pop_exception ()); |
c7ae64f2 | 452 | } |
72b7eeff | 453 | |
f4a23343 JM |
454 | /* Build up a call to terminate on the function obstack, for use as an |
455 | exception handler. */ | |
456 | ||
c6160f8f | 457 | static tree |
f4a23343 JM |
458 | build_terminate_handler () |
459 | { | |
80048418 | 460 | return build_function_call (terminate_node, NULL_TREE); |
f4a23343 JM |
461 | } |
462 | ||
e97f22c9 TT |
463 | /* Return nonzero value if DECL is a Java type suitable for catch or |
464 | throw. */ | |
465 | ||
466 | static int | |
467 | decl_is_java_type (decl, err) | |
468 | tree decl; | |
469 | int err; | |
470 | { | |
471 | int r = (TREE_CODE (decl) == POINTER_TYPE | |
472 | && TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE | |
473 | && TYPE_FOR_JAVA (TREE_TYPE (decl))); | |
474 | ||
475 | if (err) | |
476 | { | |
477 | if (TREE_CODE (decl) == REFERENCE_TYPE | |
478 | && TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE | |
479 | && TYPE_FOR_JAVA (TREE_TYPE (decl))) | |
480 | { | |
481 | /* Can't throw a reference. */ | |
482 | cp_error ("type `%T' is disallowed in Java `throw' or `catch'", | |
483 | decl); | |
484 | } | |
485 | ||
486 | if (r) | |
487 | { | |
488 | tree jthrow_node | |
489 | = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jthrowable")); | |
490 | if (jthrow_node == NULL_TREE) | |
491 | fatal ("call to Java `catch' or `throw', while `jthrowable' undefined"); | |
492 | jthrow_node = TREE_TYPE (TREE_TYPE (jthrow_node)); | |
493 | ||
494 | if (! DERIVED_FROM_P (jthrow_node, TREE_TYPE (decl))) | |
495 | { | |
496 | /* Thrown object must be a Throwable. */ | |
497 | cp_error ("type `%T' is not derived from `java::lang::Throwable'", | |
498 | TREE_TYPE (decl)); | |
499 | } | |
500 | } | |
501 | } | |
502 | ||
503 | return r; | |
504 | } | |
505 | ||
b35d4555 | 506 | /* Initialize the catch parameter DECL. */ |
6467930b | 507 | |
b35d4555 MM |
508 | static void |
509 | initialize_handler_parm (decl) | |
3c5c0849 | 510 | tree decl; |
8d08fdba | 511 | { |
b35d4555 MM |
512 | tree exp; |
513 | tree init; | |
514 | tree init_type; | |
e97f22c9 | 515 | int lang; |
b35d4555 MM |
516 | |
517 | /* Make sure we mark the catch param as used, otherwise we'll get a | |
518 | warning about an unused ((anonymous)). */ | |
519 | TREE_USED (decl) = 1; | |
520 | ||
521 | /* Figure out the type that the initializer is. */ | |
522 | init_type = TREE_TYPE (decl); | |
523 | if (TREE_CODE (init_type) != REFERENCE_TYPE | |
524 | && TREE_CODE (init_type) != POINTER_TYPE) | |
525 | init_type = build_reference_type (init_type); | |
526 | ||
e97f22c9 TT |
527 | if (decl_is_java_type (init_type, 0)) |
528 | { | |
529 | tree fn | |
530 | = builtin_function ("_Jv_exception_info", | |
531 | build_function_type (ptr_type_node, | |
532 | tree_cons (NULL_TREE, | |
533 | void_type_node, | |
534 | NULL_TREE)), | |
535 | 0, NOT_BUILT_IN, NULL_PTR); | |
536 | ||
537 | exp = build (CALL_EXPR, ptr_type_node, | |
538 | build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), | |
539 | fn), | |
540 | NULL_TREE, NULL_TREE); | |
541 | TREE_SIDE_EFFECTS (exp) = 1; | |
542 | lang = EH_LANG_Java; | |
543 | ||
544 | set_exception_lang_code (EH_LANG_Java); | |
545 | set_exception_version_code (1); | |
546 | } | |
547 | else | |
548 | { | |
549 | exp = get_eh_value (); | |
550 | lang = EH_LANG_C_plus_plus; | |
551 | } | |
552 | ||
553 | if (catch_language_init) | |
554 | { | |
555 | if (lang != catch_language) | |
556 | error ("mixing C++ and Java `catch'es in single translation unit"); | |
557 | } | |
558 | else | |
559 | { | |
560 | catch_language_init = 1; | |
561 | catch_language = lang; | |
562 | } | |
b35d4555 MM |
563 | |
564 | /* Since pointers are passed by value, initialize a reference to | |
565 | pointer catch parm with the address of the value slot. */ | |
566 | if (TREE_CODE (init_type) == REFERENCE_TYPE | |
567 | && TREE_CODE (TREE_TYPE (init_type)) == POINTER_TYPE) | |
568 | exp = build_unary_op (ADDR_EXPR, exp, 1); | |
569 | ||
570 | exp = ocp_convert (init_type , exp, CONV_IMPLICIT|CONV_FORCE_TEMP, 0); | |
571 | ||
572 | init = convert_from_reference (exp); | |
573 | ||
574 | /* If the constructor for the catch parm exits via an exception, we | |
575 | must call terminate. See eh23.C. */ | |
576 | if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))) | |
faf5394a | 577 | { |
b35d4555 MM |
578 | /* Generate the copy constructor call directly so we can wrap it. |
579 | See also expand_default_init. */ | |
580 | init = ocp_convert (TREE_TYPE (decl), init, | |
581 | CONV_IMPLICIT|CONV_FORCE_TEMP, 0); | |
582 | init = build (TRY_CATCH_EXPR, TREE_TYPE (init), init, | |
583 | build_terminate_handler ()); | |
faf5394a MS |
584 | } |
585 | ||
b35d4555 MM |
586 | /* Let `cp_finish_decl' know that this initializer is ok. */ |
587 | DECL_INITIAL (decl) = error_mark_node; | |
588 | decl = pushdecl (decl); | |
8d2733ca | 589 | |
b35d4555 | 590 | start_decl_1 (decl); |
cd9f6678 | 591 | cp_finish_decl (decl, init, NULL_TREE, |
b35d4555 | 592 | LOOKUP_ONLYCONVERTING|DIRECT_BIND); |
5816cb14 AM |
593 | } |
594 | ||
b35d4555 | 595 | /* Call this to start a catch block. DECL is the catch parameter. */ |
5816cb14 | 596 | |
b35d4555 MM |
597 | tree |
598 | expand_start_catch_block (decl) | |
3c5c0849 | 599 | tree decl; |
5816cb14 | 600 | { |
b35d4555 MM |
601 | tree compound_stmt_1; |
602 | tree compound_stmt_2; | |
603 | tree type; | |
5816cb14 | 604 | |
b35d4555 MM |
605 | if (! doing_eh (1)) |
606 | return NULL_TREE; | |
5816cb14 | 607 | |
b35d4555 | 608 | /* Make sure this declaration is reasonable. */ |
3c5c0849 MM |
609 | if (decl && !complete_ptr_ref_or_void_ptr_p (TREE_TYPE (decl), NULL_TREE)) |
610 | decl = NULL_TREE; | |
5816cb14 | 611 | |
b35d4555 MM |
612 | /* Create a binding level for the eh_info and the exception object |
613 | cleanup. */ | |
614 | compound_stmt_1 = begin_compound_stmt (/*has_no_scope=*/0); | |
615 | ||
e97f22c9 TT |
616 | if (! decl || ! decl_is_java_type (TREE_TYPE (decl), 1)) |
617 | { | |
618 | /* The ordinary C++ case. */ | |
5816cb14 | 619 | |
e97f22c9 TT |
620 | if (decl) |
621 | type = build_eh_type_type_ref (TREE_TYPE (decl)); | |
622 | else | |
623 | type = NULL_TREE; | |
624 | begin_catch_block (type); | |
625 | ||
626 | push_eh_info (); | |
627 | push_eh_cleanup (); | |
628 | } | |
629 | else | |
630 | { | |
631 | /* The Java case. In this case, the match_info is a pointer to | |
632 | the Java class object. We assume that the class is a | |
633 | compiled class. */ | |
634 | tree ref = build_java_class_ref (TREE_TYPE (TREE_TYPE (decl))); | |
635 | begin_catch_block (build1 (ADDR_EXPR, jclass_node, ref)); | |
636 | } | |
5816cb14 | 637 | |
b35d4555 MM |
638 | /* Create a binding level for the parm. */ |
639 | compound_stmt_2 = begin_compound_stmt (/*has_no_scope=*/0); | |
5816cb14 | 640 | |
b35d4555 MM |
641 | if (decl) |
642 | initialize_handler_parm (decl); | |
5816cb14 | 643 | |
b35d4555 | 644 | return build_tree_list (compound_stmt_1, compound_stmt_2); |
5816cb14 AM |
645 | } |
646 | ||
f30432d7 | 647 | |
8d2733ca MS |
648 | /* Call this to end a catch block. Its responsible for emitting the |
649 | code to handle jumping back to the correct place, and for emitting | |
650 | the label to jump to if this catch block didn't match. */ | |
6467930b | 651 | |
824b9a4c | 652 | void |
b35d4555 MM |
653 | expand_end_catch_block (blocks) |
654 | tree blocks; | |
8d08fdba | 655 | { |
b35d4555 MM |
656 | tree compound_stmt_1 = blocks ? TREE_PURPOSE (blocks): NULL_TREE; |
657 | tree compound_stmt_2 = blocks ? TREE_VALUE (blocks): NULL_TREE; | |
658 | ||
f30432d7 MS |
659 | if (! doing_eh (1)) |
660 | return; | |
8d2733ca | 661 | |
0dde4175 JM |
662 | /* The exception being handled is rethrown if control reaches the end of |
663 | a handler of the function-try-block of a constructor or destructor. */ | |
664 | if (in_function_try_handler | |
665 | && (DECL_CONSTRUCTOR_P (current_function_decl) | |
666 | || DECL_DESTRUCTOR_P (current_function_decl))) | |
b35d4555 | 667 | finish_expr_stmt (build_throw (NULL_TREE)); |
0dde4175 | 668 | |
c7ae64f2 | 669 | /* Cleanup the EH parameter. */ |
b35d4555 | 670 | finish_compound_stmt (/*has_no_scope=*/0, compound_stmt_2); |
46e8c075 | 671 | /* Cleanup the EH object. */ |
4a6ef811 | 672 | finish_compound_stmt (/*has_no_scope=*/0, compound_stmt_1); |
8d2733ca | 673 | } |
8d08fdba | 674 | |
6c20b7e9 JM |
675 | /* An exception spec is implemented more or less like: |
676 | ||
677 | try { | |
678 | function body; | |
679 | } catch (...) { | |
680 | void *p[] = { typeid(raises) }; | |
681 | __check_eh_spec (p, count); | |
682 | } | |
683 | ||
684 | __check_eh_spec in exception.cc handles all the details. */ | |
8d2733ca | 685 | |
b35d4555 | 686 | tree |
f30432d7 MS |
687 | expand_start_eh_spec () |
688 | { | |
b35d4555 | 689 | return begin_try_block (); |
f30432d7 MS |
690 | } |
691 | ||
b35d4555 MM |
692 | void |
693 | expand_end_eh_spec (raises, try_block) | |
f30432d7 | 694 | tree raises; |
b35d4555 | 695 | tree try_block; |
f30432d7 | 696 | { |
6c20b7e9 | 697 | tree tmp, fn, decl, types = NULL_TREE; |
b35d4555 MM |
698 | tree blocks; |
699 | tree handler; | |
6c20b7e9 | 700 | int count = 0; |
f30432d7 | 701 | |
b35d4555 MM |
702 | finish_try_block (try_block); |
703 | handler = begin_handler (); | |
704 | blocks = finish_handler_parms (NULL_TREE, handler); | |
f30432d7 | 705 | |
6c20b7e9 JM |
706 | /* Build up an array of type_infos. */ |
707 | for (; raises && TREE_VALUE (raises); raises = TREE_CHAIN (raises)) | |
708 | { | |
e1b3e07d | 709 | types = tree_cons |
6c20b7e9 JM |
710 | (NULL_TREE, build_eh_type_type (TREE_VALUE (raises)), types); |
711 | ++count; | |
712 | } | |
eb66be0e | 713 | |
6c20b7e9 JM |
714 | types = build_nt (CONSTRUCTOR, NULL_TREE, types); |
715 | TREE_HAS_CONSTRUCTOR (types) = 1; | |
6874c264 | 716 | |
6c20b7e9 | 717 | /* We can't pass the CONSTRUCTOR directly, so stick it in a variable. */ |
52bf7d5d | 718 | tmp = build_cplus_array_type (const_ptr_type_node, NULL_TREE); |
6c20b7e9 JM |
719 | decl = build_decl (VAR_DECL, NULL_TREE, tmp); |
720 | DECL_ARTIFICIAL (decl) = 1; | |
721 | DECL_INITIAL (decl) = types; | |
46e8c075 | 722 | DECL_CONTEXT (decl) = current_function_decl; |
cd9f6678 | 723 | cp_finish_decl (decl, types, NULL_TREE, 0); |
6c20b7e9 JM |
724 | |
725 | decl = decay_conversion (decl); | |
6874c264 | 726 | |
6c20b7e9 JM |
727 | fn = get_identifier ("__check_eh_spec"); |
728 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
729 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
730 | else | |
f30432d7 | 731 | { |
6c20b7e9 JM |
732 | tmp = tree_cons |
733 | (NULL_TREE, integer_type_node, tree_cons | |
734 | (NULL_TREE, TREE_TYPE (decl), void_list_node)); | |
735 | tmp = build_function_type (void_type_node, tmp); | |
f30432d7 | 736 | |
6c20b7e9 JM |
737 | fn = build_lang_decl (FUNCTION_DECL, fn, tmp); |
738 | DECL_EXTERNAL (fn) = 1; | |
739 | TREE_PUBLIC (fn) = 1; | |
740 | DECL_ARTIFICIAL (fn) = 1; | |
741 | TREE_THIS_VOLATILE (fn) = 1; | |
742 | pushdecl_top_level (fn); | |
743 | make_function_rtl (fn); | |
6c20b7e9 JM |
744 | } |
745 | ||
a6ecf8b6 | 746 | mark_used (fn); |
e1b3e07d MM |
747 | tmp = tree_cons (NULL_TREE, build_int_2 (count, 0), |
748 | tree_cons (NULL_TREE, decl, NULL_TREE)); | |
6c20b7e9 | 749 | tmp = build_call (fn, TREE_TYPE (TREE_TYPE (fn)), tmp); |
b35d4555 | 750 | finish_expr_stmt (tmp); |
6c20b7e9 | 751 | |
b35d4555 MM |
752 | finish_handler (blocks, handler); |
753 | finish_handler_sequence (try_block); | |
f30432d7 MS |
754 | } |
755 | ||
8d2733ca MS |
756 | /* This is called to expand all the toplevel exception handling |
757 | finalization for a function. It should only be called once per | |
758 | function. */ | |
6467930b | 759 | |
8d08fdba | 760 | void |
8d2733ca | 761 | expand_exception_blocks () |
8d08fdba | 762 | { |
92b96838 | 763 | do_pending_stack_adjust (); |
eb448459 | 764 | |
e00737d2 | 765 | if (catch_clauses) |
f30432d7 | 766 | { |
e00737d2 MS |
767 | rtx funcend = gen_label_rtx (); |
768 | emit_jump (funcend); | |
769 | ||
eb66be0e MS |
770 | /* We cannot protect n regions this way if we must flow into the |
771 | EH region through the top of the region, as we have to with | |
772 | the setjmp/longjmp approach. */ | |
773 | if (exceptions_via_longjmp == 0) | |
fb98cff6 | 774 | expand_eh_region_start (); |
f30432d7 | 775 | |
e00737d2 MS |
776 | emit_insns (catch_clauses); |
777 | catch_clauses = NULL_RTX; | |
eb66be0e MS |
778 | |
779 | if (exceptions_via_longjmp == 0) | |
f4a23343 | 780 | expand_eh_region_end (build_terminate_handler ()); |
eb66be0e | 781 | |
4a6ef811 MM |
782 | emit_insns (catch_clauses); |
783 | catch_clauses = NULL_RTX; | |
e00737d2 MS |
784 | emit_label (funcend); |
785 | } | |
8d08fdba MS |
786 | } |
787 | ||
f4a23343 JM |
788 | /* Return a pointer to a buffer for an exception object of type TYPE. */ |
789 | ||
c6160f8f | 790 | static tree |
f4a23343 JM |
791 | alloc_eh_object (type) |
792 | tree type; | |
793 | { | |
794 | tree fn, exp; | |
795 | ||
796 | fn = get_identifier ("__eh_alloc"); | |
797 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
798 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
799 | else | |
800 | { | |
801 | /* Declare __eh_alloc (size_t), as defined in exception.cc. */ | |
802 | tree tmp; | |
f4a23343 JM |
803 | tmp = tree_cons (NULL_TREE, sizetype, void_list_node); |
804 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
805 | build_function_type (ptr_type_node, tmp)); | |
806 | DECL_EXTERNAL (fn) = 1; | |
807 | TREE_PUBLIC (fn) = 1; | |
808 | DECL_ARTIFICIAL (fn) = 1; | |
12a22e76 | 809 | TREE_NOTHROW (fn) = 1; |
f4a23343 JM |
810 | pushdecl_top_level (fn); |
811 | make_function_rtl (fn); | |
f4a23343 JM |
812 | } |
813 | ||
a6ecf8b6 | 814 | mark_used (fn); |
e1b3e07d | 815 | exp = build_function_call (fn, tree_cons |
f4a23343 JM |
816 | (NULL_TREE, size_in_bytes (type), NULL_TREE)); |
817 | exp = build1 (NOP_EXPR, build_pointer_type (type), exp); | |
818 | return exp; | |
819 | } | |
820 | ||
6467930b | 821 | /* Expand a throw statement. This follows the following |
8d2733ca MS |
822 | algorithm: |
823 | ||
824 | 1. Allocate space to save the current PC onto the stack. | |
825 | 2. Generate and emit a label and save its address into the | |
e1cd6e56 | 826 | newly allocated stack space since we can't save the pc directly. |
8d2733ca MS |
827 | 3. If this is the first call to throw in this function: |
828 | generate a label for the throw block | |
829 | 4. jump to the throw block label. */ | |
6467930b | 830 | |
225ff119 | 831 | static tree |
8d2733ca MS |
832 | expand_throw (exp) |
833 | tree exp; | |
8d08fdba | 834 | { |
6874c264 | 835 | tree fn; |
8d08fdba | 836 | |
8d2733ca | 837 | if (! doing_eh (1)) |
59ccf49d | 838 | return error_mark_node; |
8d08fdba | 839 | |
e97f22c9 TT |
840 | if (exp |
841 | && decl_is_java_type (TREE_TYPE (exp), 1)) | |
842 | { | |
843 | /* A Java `throw' statement. */ | |
844 | tree args = tree_cons (NULL_TREE, exp, NULL); | |
845 | ||
846 | fn = get_identifier (exceptions_via_longjmp | |
847 | ? "_Jv_Sjlj_throw" | |
848 | : "_Jv_Throw"); | |
849 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
850 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
851 | else | |
852 | { | |
853 | /* Declare _Jv_Throw (void *), as defined in Java's | |
854 | exception.cc. */ | |
855 | tree tmp; | |
856 | tmp = tree_cons (NULL_TREE, ptr_type_node, void_list_node); | |
857 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
858 | build_function_type (ptr_type_node, tmp)); | |
859 | DECL_EXTERNAL (fn) = 1; | |
860 | TREE_PUBLIC (fn) = 1; | |
861 | DECL_ARTIFICIAL (fn) = 1; | |
12a22e76 | 862 | TREE_THIS_VOLATILE (fn) = 1; |
e97f22c9 TT |
863 | pushdecl_top_level (fn); |
864 | make_function_rtl (fn); | |
865 | } | |
866 | ||
867 | exp = build_function_call (fn, args); | |
868 | } | |
869 | else if (exp) | |
8d2733ca | 870 | { |
faae18ab | 871 | tree throw_type; |
6874c264 | 872 | tree cleanup = NULL_TREE, e; |
59ccf49d MM |
873 | tree stmt_expr; |
874 | tree compound_stmt; | |
875 | tree try_block; | |
876 | ||
877 | begin_init_stmts (&stmt_expr, &compound_stmt); | |
faae18ab | 878 | |
a3b49ccd | 879 | /* throw expression */ |
e92cc029 | 880 | /* First, decay it. */ |
f30432d7 | 881 | exp = decay_conversion (exp); |
a3b49ccd | 882 | |
6874c264 JM |
883 | /* cleanup_type is void (*)(void *, int), |
884 | the internal type of a destructor. */ | |
885 | if (cleanup_type == NULL_TREE) | |
59ccf49d MM |
886 | cleanup_type = build_pointer_type |
887 | (build_function_type | |
888 | (void_type_node, tree_cons | |
889 | (NULL_TREE, ptr_type_node, tree_cons | |
890 | (NULL_TREE, integer_type_node, void_list_node)))); | |
6874c264 | 891 | |
08b24bda | 892 | if (TYPE_PTR_P (TREE_TYPE (exp))) |
db48b831 | 893 | throw_type = build_eh_type_type (TREE_TYPE (exp)); |
f30432d7 MS |
894 | else |
895 | { | |
f4a23343 JM |
896 | tree object, ptr; |
897 | ||
cab1f180 | 898 | /* OK, this is kind of wacky. The standard says that we call |
46e8c075 MM |
899 | terminate when the exception handling mechanism, after |
900 | completing evaluation of the expression to be thrown but | |
901 | before the exception is caught (_except.throw_), calls a | |
902 | user function that exits via an uncaught exception. | |
f4a23343 JM |
903 | |
904 | So we have to protect the actual initialization of the | |
905 | exception object with terminate(), but evaluate the expression | |
906 | first. We also expand the call to __eh_alloc | |
907 | first. Since there could be temps in the expression, we need | |
908 | to handle that, too. */ | |
a50f0918 | 909 | |
59ccf49d | 910 | my_friendly_assert (stmts_are_full_exprs_p == 1, 19990926); |
f4a23343 | 911 | |
f4a23343 JM |
912 | /* Store the throw expression into a temp. This can be less |
913 | efficient than storing it into the allocated space directly, but | |
914 | oh well. To do this efficiently we would need to insinuate | |
915 | ourselves into expand_call. */ | |
916 | if (TREE_SIDE_EFFECTS (exp)) | |
917 | { | |
f1dedc31 | 918 | tree temp = create_temporary_var (TREE_TYPE (exp)); |
c37dc68e | 919 | DECL_INITIAL (temp) = exp; |
cd9f6678 | 920 | cp_finish_decl (temp, exp, NULL_TREE, LOOKUP_ONLYCONVERTING); |
f4a23343 JM |
921 | exp = temp; |
922 | } | |
f4a23343 JM |
923 | |
924 | /* Allocate the space for the exception. */ | |
925 | ptr = save_expr (alloc_eh_object (TREE_TYPE (exp))); | |
59ccf49d | 926 | finish_expr_stmt (ptr); |
f4a23343 | 927 | |
59ccf49d | 928 | try_block = begin_try_block (); |
f4a23343 JM |
929 | object = build_indirect_ref (ptr, NULL_PTR); |
930 | exp = build_modify_expr (object, INIT_EXPR, exp); | |
faae18ab | 931 | |
f30432d7 | 932 | if (exp == error_mark_node) |
8251199e | 933 | error (" in thrown expression"); |
faae18ab | 934 | |
59ccf49d MM |
935 | finish_expr_stmt (exp); |
936 | finish_cleanup_try_block (try_block); | |
937 | finish_cleanup (build_terminate_handler (), try_block); | |
f4a23343 | 938 | |
db48b831 | 939 | throw_type = build_eh_type_type (TREE_TYPE (object)); |
72b7eeff | 940 | |
6874c264 JM |
941 | if (TYPE_HAS_DESTRUCTOR (TREE_TYPE (object))) |
942 | { | |
943 | cleanup = lookup_fnfields (TYPE_BINFO (TREE_TYPE (object)), | |
944 | dtor_identifier, 0); | |
945 | cleanup = TREE_VALUE (cleanup); | |
e872bb7a | 946 | mark_used (cleanup); |
6874c264 JM |
947 | mark_addressable (cleanup); |
948 | /* Pretend it's a normal function. */ | |
949 | cleanup = build1 (ADDR_EXPR, cleanup_type, cleanup); | |
950 | } | |
f4a23343 JM |
951 | |
952 | exp = ptr; | |
f30432d7 | 953 | } |
faae18ab | 954 | |
bbeeb2b0 MM |
955 | /* Cast EXP to `void *' so that it will match the prototype for |
956 | __cp_push_exception. */ | |
c37dc68e | 957 | exp = convert (ptr_type_node, exp); |
bbeeb2b0 | 958 | |
6874c264 JM |
959 | if (cleanup == NULL_TREE) |
960 | { | |
961 | cleanup = build_int_2 (0, 0); | |
962 | TREE_TYPE (cleanup) = cleanup_type; | |
963 | } | |
72b7eeff | 964 | |
6874c264 JM |
965 | fn = get_identifier ("__cp_push_exception"); |
966 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
967 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
968 | else | |
969 | { | |
970 | /* Declare __cp_push_exception (void*, void*, void (*)(void*, int)), | |
971 | as defined in exception.cc. */ | |
972 | tree tmp; | |
6874c264 JM |
973 | tmp = tree_cons |
974 | (NULL_TREE, ptr_type_node, tree_cons | |
975 | (NULL_TREE, ptr_type_node, tree_cons | |
976 | (NULL_TREE, cleanup_type, void_list_node))); | |
977 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
978 | build_function_type (void_type_node, tmp)); | |
979 | DECL_EXTERNAL (fn) = 1; | |
980 | TREE_PUBLIC (fn) = 1; | |
981 | DECL_ARTIFICIAL (fn) = 1; | |
12a22e76 | 982 | TREE_NOTHROW (fn) = 1; |
6874c264 JM |
983 | pushdecl_top_level (fn); |
984 | make_function_rtl (fn); | |
6874c264 | 985 | } |
72b7eeff | 986 | |
a6ecf8b6 | 987 | mark_used (fn); |
e1b3e07d MM |
988 | e = tree_cons (NULL_TREE, exp, tree_cons |
989 | (NULL_TREE, throw_type, tree_cons | |
990 | (NULL_TREE, cleanup, NULL_TREE))); | |
59ccf49d MM |
991 | finish_expr_stmt (build_function_call (fn, e)); |
992 | ||
993 | exp = finish_init_stmts (stmt_expr, compound_stmt); | |
8d2733ca MS |
994 | } |
995 | else | |
a3b49ccd | 996 | { |
6874c264 JM |
997 | /* rethrow current exception; note that it's no longer caught. */ |
998 | ||
999 | tree fn = get_identifier ("__uncatch_exception"); | |
1000 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
1001 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
1002 | else | |
1003 | { | |
1004 | /* Declare void __uncatch_exception (void) | |
1005 | as defined in exception.cc. */ | |
6874c264 JM |
1006 | fn = build_lang_decl (FUNCTION_DECL, fn, |
1007 | build_function_type (void_type_node, | |
1008 | void_list_node)); | |
1009 | DECL_EXTERNAL (fn) = 1; | |
1010 | TREE_PUBLIC (fn) = 1; | |
1011 | DECL_ARTIFICIAL (fn) = 1; | |
12a22e76 | 1012 | TREE_NOTHROW (fn) = 1; |
6874c264 JM |
1013 | pushdecl_top_level (fn); |
1014 | make_function_rtl (fn); | |
6874c264 JM |
1015 | } |
1016 | ||
a6ecf8b6 | 1017 | mark_used (fn); |
6874c264 | 1018 | exp = build_function_call (fn, NULL_TREE); |
a3b49ccd | 1019 | } |
8d2733ca | 1020 | |
59ccf49d | 1021 | return exp; |
f376e137 | 1022 | } |
8d2733ca MS |
1023 | |
1024 | /* Build a throw expression. */ | |
6467930b | 1025 | |
8d2733ca MS |
1026 | tree |
1027 | build_throw (e) | |
1028 | tree e; | |
1029 | { | |
02020185 JM |
1030 | if (e == error_mark_node) |
1031 | return e; | |
1032 | ||
1033 | if (processing_template_decl) | |
1034 | return build_min (THROW_EXPR, void_type_node, e); | |
1035 | ||
e0f9a8bc | 1036 | if (e == null_node) |
8251199e | 1037 | cp_warning ("throwing NULL, which has integral, not pointer type"); |
980c394c NS |
1038 | |
1039 | if (e != NULL_TREE) | |
1040 | { | |
4cfbc546 NS |
1041 | if (!complete_ptr_ref_or_void_ptr_p (TREE_TYPE (e), e)) |
1042 | return error_mark_node; | |
980c394c | 1043 | } |
02020185 | 1044 | |
59ccf49d | 1045 | e = expand_throw (e); |
02020185 JM |
1046 | e = build1 (THROW_EXPR, void_type_node, e); |
1047 | TREE_SIDE_EFFECTS (e) = 1; | |
1048 | TREE_USED (e) = 1; | |
1049 | ||
8d2733ca | 1050 | return e; |
8d08fdba | 1051 | } |
4cfbc546 NS |
1052 | |
1053 | /* Make sure TYPE is complete, pointer to complete, reference to | |
1054 | complete, or pointer to cv void. Issue diagnostic on failure. | |
1055 | Return the zero on failure and non-zero on success. FROM can be | |
1056 | the expr or decl from whence TYPE came, if available. */ | |
1057 | ||
1058 | static int | |
1059 | complete_ptr_ref_or_void_ptr_p (type, from) | |
1060 | tree type; | |
1061 | tree from; | |
1062 | { | |
1063 | int is_ptr; | |
1064 | ||
1065 | /* Check complete. */ | |
1066 | type = complete_type_or_else (type, from); | |
1067 | if (!type) | |
1068 | return 0; | |
1069 | ||
1070 | /* Or a pointer or ref to one, or cv void *. */ | |
1071 | is_ptr = TREE_CODE (type) == POINTER_TYPE; | |
1072 | if (is_ptr || TREE_CODE (type) == REFERENCE_TYPE) | |
1073 | { | |
1074 | tree core = TREE_TYPE (type); | |
1075 | ||
1076 | if (is_ptr && same_type_p (TYPE_MAIN_VARIANT (core), void_type_node)) | |
1077 | /* OK */; | |
1078 | else if (!complete_type_or_else (core, from)) | |
1079 | return 0; | |
1080 | } | |
1081 | return 1; | |
1082 | } | |
1083 |