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8d08fdba | 1 | /* Handle exceptional things in C++. |
6467930b | 2 | Copyright (C) 1989, 92-95, 1996 Free Software Foundation, Inc. |
8d2733ca MS |
3 | Contributed by Michael Tiemann <tiemann@cygnus.com> |
4 | Rewritten by Mike Stump <mrs@cygnus.com>, based upon an | |
5 | initial re-implementation courtesy Tad Hunt. | |
8d08fdba MS |
6 | |
7 | This file is part of GNU CC. | |
8 | ||
9 | GNU CC is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2, or (at your option) | |
12 | any later version. | |
13 | ||
14 | GNU CC is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with GNU CC; see the file COPYING. If not, write to | |
e9fa0c7c RK |
21 | the Free Software Foundation, 59 Temple Place - Suite 330, |
22 | Boston, MA 02111-1307, USA. */ | |
8d08fdba MS |
23 | |
24 | ||
8d08fdba | 25 | #include "config.h" |
da20811c | 26 | #include <stdio.h> |
8d08fdba MS |
27 | #include "tree.h" |
28 | #include "rtl.h" | |
29 | #include "cp-tree.h" | |
30 | #include "flags.h" | |
8d2733ca MS |
31 | #include "obstack.h" |
32 | #include "expr.h" | |
21451173 | 33 | #include "output.h" |
6467930b MS |
34 | #include "except.h" |
35 | #include "function.h" | |
0021b564 | 36 | #include "defaults.h" |
8d08fdba | 37 | |
f30432d7 | 38 | rtx expand_builtin_return_addr PROTO((enum built_in_function, int, rtx)); |
a3b49ccd | 39 | |
eb66be0e | 40 | /* Holds the fndecl for __builtin_return_address. */ |
8d2733ca | 41 | tree builtin_return_address_fndecl; |
8d2733ca MS |
42 | |
43 | /* A couple of backend routines from m88k.c */ | |
44 | ||
eb66be0e | 45 | /* Used to cache a call to __builtin_return_address. */ |
8d2733ca | 46 | static tree BuiltinReturnAddress; |
f30432d7 | 47 | |
49c249e1 JM |
48 | static void easy_expand_asm PROTO((char *)); |
49 | static void push_eh_cleanup PROTO((void)); | |
50 | static void do_unwind PROTO((rtx)); | |
51 | static rtx do_function_call PROTO((tree, tree, tree)); | |
52 | static tree build_eh_type_type PROTO((tree)); | |
53 | static tree build_eh_type PROTO((tree)); | |
54 | static void expand_end_eh_spec PROTO((tree)); | |
8d2733ca | 55 | |
8d2733ca MS |
56 | static void |
57 | easy_expand_asm (str) | |
58 | char *str; | |
59 | { | |
60 | expand_asm (build_string (strlen (str)+1, str)); | |
8d08fdba MS |
61 | } |
62 | ||
8d08fdba | 63 | |
8d2733ca | 64 | #if 0 |
e92cc029 | 65 | /* This is the startup, and finish stuff per exception table. */ |
8d08fdba | 66 | |
8d2733ca MS |
67 | /* XXX - Tad: exception handling section */ |
68 | #ifndef EXCEPT_SECTION_ASM_OP | |
69 | #define EXCEPT_SECTION_ASM_OP "section\t.gcc_except_table,\"a\",@progbits" | |
70 | #endif | |
8d08fdba | 71 | |
8d2733ca MS |
72 | #ifdef EXCEPT_SECTION_ASM_OP |
73 | typedef struct { | |
6467930b MS |
74 | void *start_region; |
75 | void *end_region; | |
8d2733ca MS |
76 | void *exception_handler; |
77 | } exception_table; | |
78 | #endif /* EXCEPT_SECTION_ASM_OP */ | |
8d08fdba | 79 | |
8d2733ca | 80 | #ifdef EXCEPT_SECTION_ASM_OP |
8d08fdba | 81 | |
8d2733ca MS |
82 | /* on machines which support it, the exception table lives in another section, |
83 | but it needs a label so we can reference it... This sets up that | |
84 | label! */ | |
85 | asm (EXCEPT_SECTION_ASM_OP); | |
86 | exception_table __EXCEPTION_TABLE__[1] = { (void*)0, (void*)0, (void*)0 }; | |
87 | asm (TEXT_SECTION_ASM_OP); | |
8d08fdba | 88 | |
8d2733ca | 89 | #endif /* EXCEPT_SECTION_ASM_OP */ |
8d08fdba | 90 | |
8d2733ca MS |
91 | #ifdef EXCEPT_SECTION_ASM_OP |
92 | ||
93 | /* we need to know where the end of the exception table is... so this | |
94 | is how we do it! */ | |
95 | ||
96 | asm (EXCEPT_SECTION_ASM_OP); | |
97 | exception_table __EXCEPTION_END__[1] = { (void*)-1, (void*)-1, (void*)-1 }; | |
98 | asm (TEXT_SECTION_ASM_OP); | |
99 | ||
100 | #endif /* EXCEPT_SECTION_ASM_OP */ | |
101 | ||
102 | #endif | |
8d08fdba | 103 | |
8d2733ca | 104 | #include "decl.h" |
8d2733ca MS |
105 | #include "insn-flags.h" |
106 | #include "obstack.h" | |
8d2733ca MS |
107 | |
108 | /* ====================================================================== | |
109 | Briefly the algorithm works like this: | |
110 | ||
111 | When a constructor or start of a try block is encountered, | |
112 | push_eh_entry (&eh_stack) is called. Push_eh_entry () creates a | |
113 | new entry in the unwind protection stack and returns a label to | |
114 | output to start the protection for that block. | |
115 | ||
116 | When a destructor or end try block is encountered, pop_eh_entry | |
6467930b MS |
117 | (&eh_stack) is called. Pop_eh_entry () returns the eh_entry it |
118 | created when push_eh_entry () was called. The eh_entry structure | |
8d2733ca MS |
119 | contains three things at this point. The start protect label, |
120 | the end protect label, and the exception handler label. The end | |
121 | protect label should be output before the call to the destructor | |
122 | (if any). If it was a destructor, then its parse tree is stored | |
6467930b | 123 | in the finalization variable in the eh_entry structure. Otherwise |
8d2733ca | 124 | the finalization variable is set to NULL to reflect the fact that |
6467930b | 125 | is the the end of a try block. Next, this modified eh_entry node |
8d2733ca MS |
126 | is enqueued in the finalizations queue by calling |
127 | enqueue_eh_entry (&queue,entry). | |
128 | ||
129 | +---------------------------------------------------------------+ | |
130 | |XXX: Will need modification to deal with partially | | |
131 | | constructed arrays of objects | | |
132 | | | | |
133 | | Basically, this consists of keeping track of how many | | |
134 | | of the objects have been constructed already (this | | |
135 | | should be in a register though, so that shouldn't be a | | |
136 | | problem. | | |
137 | +---------------------------------------------------------------+ | |
138 | ||
139 | When a catch block is encountered, there is a lot of work to be | |
140 | done. | |
141 | ||
142 | Since we don't want to generate the catch block inline with the | |
143 | regular flow of the function, we need to have some way of doing | |
f30432d7 MS |
144 | so. Luckily, we can use sequences to defer the catch sections. |
145 | When the start of a catch block is encountered, we start the | |
146 | sequence. After the catch block is generated, we end the | |
147 | sequence. | |
148 | ||
8d2733ca MS |
149 | Next we must insure that when the catch block is executed, all |
150 | finalizations for the matching try block have been completed. If | |
151 | any of those finalizations throw an exception, we must call | |
152 | terminate according to the ARM (section r.15.6.1). What this | |
153 | means is that we need to dequeue and emit finalizations for each | |
6467930b | 154 | entry in the eh_queue until we get to an entry with a NULL |
8d2733ca MS |
155 | finalization field. For any of the finalization entries, if it |
156 | is not a call to terminate (), we must protect it by giving it | |
157 | another start label, end label, and exception handler label, | |
158 | setting its finalization tree to be a call to terminate (), and | |
6467930b | 159 | enqueue'ing this new eh_entry to be output at an outer level. |
8d2733ca MS |
160 | Finally, after all that is done, we can get around to outputting |
161 | the catch block which basically wraps all the "catch (...) {...}" | |
162 | statements in a big if/then/else construct that matches the | |
163 | correct block to call. | |
164 | ||
165 | ===================================================================== */ | |
166 | ||
8d2733ca MS |
167 | /* local globals for function calls |
168 | ====================================================================== */ | |
169 | ||
eb66be0e MS |
170 | /* Used to cache "terminate", "unexpected", "set_terminate", and |
171 | "set_unexpected" after default_conversion. (lib-except.c) */ | |
6467930b | 172 | static tree Terminate, Unexpected, SetTerminate, SetUnexpected, CatchMatch; |
8d2733ca | 173 | |
eb66be0e | 174 | /* Used to cache __find_first_exception_table_match for throw. */ |
8d2733ca MS |
175 | static tree FirstExceptionMatch; |
176 | ||
eb66be0e | 177 | /* Used to cache a call to __unwind_function. */ |
8d2733ca MS |
178 | static tree Unwind; |
179 | ||
eb66be0e | 180 | /* Holds a ready to emit call to "terminate". */ |
8d2733ca MS |
181 | static tree TerminateFunctionCall; |
182 | ||
183 | /* ====================================================================== */ | |
184 | ||
185 | ||
8d2733ca MS |
186 | /* ========================================================================= */ |
187 | ||
188 | ||
189 | ||
190 | /* local globals - these local globals are for storing data necessary for | |
191 | generating the exception table and code in the correct order. | |
192 | ||
193 | ========================================================================= */ | |
194 | ||
a3b49ccd | 195 | /* Holds the pc for doing "throw" */ |
5566b478 | 196 | static tree saved_pc; |
f30432d7 | 197 | |
6467930b MS |
198 | extern int throw_used; |
199 | extern rtx catch_clauses; | |
6c20b7e9 | 200 | extern tree const_ptr_type_node; |
8d2733ca | 201 | |
8d2733ca MS |
202 | /* ========================================================================= */ |
203 | ||
6467930b | 204 | /* Cheesyness to save some typing. Returns the return value rtx. */ |
8d2733ca | 205 | |
5566b478 | 206 | static rtx |
f30432d7 MS |
207 | do_function_call (func, params, return_type) |
208 | tree func, params, return_type; | |
209 | { | |
210 | tree func_call; | |
211 | func_call = build_function_call (func, params); | |
212 | expand_call (func_call, NULL_RTX, 0); | |
213 | if (return_type != NULL_TREE) | |
214 | return hard_function_value (return_type, func_call); | |
215 | return NULL_RTX; | |
216 | } | |
217 | ||
8d2733ca MS |
218 | /* ========================================================================= */ |
219 | ||
8d2733ca MS |
220 | /* sets up all the global eh stuff that needs to be initialized at the |
221 | start of compilation. | |
222 | ||
223 | This includes: | |
6467930b | 224 | - Setting up all the function call trees. */ |
8d08fdba | 225 | |
8d08fdba | 226 | void |
8d2733ca | 227 | init_exception_processing () |
8d08fdba | 228 | { |
8d2733ca MS |
229 | tree unexpected_fndecl, terminate_fndecl; |
230 | tree set_unexpected_fndecl, set_terminate_fndecl; | |
231 | tree catch_match_fndecl; | |
232 | tree find_first_exception_match_fndecl; | |
233 | tree unwind_fndecl; | |
f30432d7 MS |
234 | tree declspecs; |
235 | tree d; | |
a3b49ccd | 236 | |
6633d636 MS |
237 | /* void vtype () */ |
238 | tree vtype = build_function_type (void_type_node, void_list_node); | |
239 | ||
8d2733ca | 240 | /* void (*)() */ |
6633d636 | 241 | tree PFV = build_pointer_type (vtype); |
8d08fdba | 242 | |
eb66be0e MS |
243 | /* Arg list for the build_function_type call for set_terminate and |
244 | set_unexpected. */ | |
8ccc31eb | 245 | tree pfvlist = tree_cons (NULL_TREE, PFV, void_list_node); |
8d08fdba | 246 | |
8ccc31eb MS |
247 | /* void (*pfvtype (void (*) ()))() */ |
248 | tree pfvtype = build_function_type (PFV, pfvlist); | |
8d2733ca | 249 | |
8ccc31eb MS |
250 | set_terminate_fndecl = auto_function (get_identifier ("set_terminate"), |
251 | pfvtype, NOT_BUILT_IN); | |
252 | set_unexpected_fndecl = auto_function (get_identifier ("set_unexpected"), | |
253 | pfvtype, NOT_BUILT_IN); | |
254 | unexpected_fndecl = auto_function (get_identifier ("unexpected"), | |
255 | vtype, NOT_BUILT_IN); | |
256 | terminate_fndecl = auto_function (get_identifier ("terminate"), | |
257 | vtype, NOT_BUILT_IN); | |
e00737d2 | 258 | TREE_THIS_VOLATILE (terminate_fndecl) = 1; |
8ccc31eb | 259 | |
8ccc31eb | 260 | push_lang_context (lang_name_c); |
8d2733ca | 261 | |
beb53fb8 JM |
262 | catch_match_fndecl |
263 | = builtin_function (flag_rtti | |
264 | ? "__throw_type_match_rtti" | |
265 | : "__throw_type_match", | |
266 | build_function_type (ptr_type_node, | |
6c20b7e9 JM |
267 | tree_cons (NULL_TREE, const_ptr_type_node, |
268 | tree_cons (NULL_TREE, const_ptr_type_node, | |
beb53fb8 JM |
269 | tree_cons (NULL_TREE, ptr_type_node, |
270 | void_list_node)))), | |
271 | NOT_BUILT_IN, NULL_PTR); | |
272 | find_first_exception_match_fndecl | |
273 | = builtin_function ("__find_first_exception_table_match", | |
274 | build_function_type (ptr_type_node, | |
275 | tree_cons (NULL_TREE, ptr_type_node, | |
276 | void_list_node)), | |
277 | NOT_BUILT_IN, NULL_PTR); | |
278 | unwind_fndecl | |
279 | = builtin_function ("__unwind_function", | |
280 | build_function_type (void_type_node, | |
281 | tree_cons (NULL_TREE, ptr_type_node, | |
282 | void_list_node)), | |
283 | NOT_BUILT_IN, NULL_PTR); | |
8d2733ca MS |
284 | |
285 | Unexpected = default_conversion (unexpected_fndecl); | |
286 | Terminate = default_conversion (terminate_fndecl); | |
287 | SetTerminate = default_conversion (set_terminate_fndecl); | |
288 | SetUnexpected = default_conversion (set_unexpected_fndecl); | |
289 | CatchMatch = default_conversion (catch_match_fndecl); | |
290 | FirstExceptionMatch = default_conversion (find_first_exception_match_fndecl); | |
291 | Unwind = default_conversion (unwind_fndecl); | |
292 | BuiltinReturnAddress = default_conversion (builtin_return_address_fndecl); | |
293 | ||
294 | TerminateFunctionCall = build_function_call (Terminate, NULL_TREE); | |
295 | ||
296 | pop_lang_context (); | |
f30432d7 | 297 | |
6874c264 JM |
298 | d = build_decl (VAR_DECL, get_identifier ("__eh_pc"), ptr_type_node); |
299 | TREE_PUBLIC (d) = 1; | |
300 | DECL_EXTERNAL (d) = 1; | |
301 | DECL_ARTIFICIAL (d) = 1; | |
302 | cp_finish_decl (d, NULL_TREE, NULL_TREE, 0, 0); | |
303 | saved_pc = d; | |
eb66be0e MS |
304 | |
305 | /* If we use setjmp/longjmp EH, arrange for all cleanup actions to | |
306 | be protected with __terminate. */ | |
307 | protect_cleanup_actions_with_terminate = 1; | |
8d2733ca MS |
308 | } |
309 | ||
95e8dcba | 310 | /* Retrieve a pointer to the cp_eh_info node for the current exception. */ |
6874c264 | 311 | |
95e8dcba JM |
312 | static tree |
313 | call_eh_info () | |
6874c264 | 314 | { |
95e8dcba | 315 | tree fn; |
6874c264 JM |
316 | |
317 | fn = get_identifier ("__cp_exception_info"); | |
318 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
319 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
320 | else | |
321 | { | |
20b90169 | 322 | tree t, fields[6]; |
6874c264 JM |
323 | |
324 | /* Declare cp_eh_info * __cp_exception_info (void), | |
325 | as defined in exception.cc. */ | |
326 | push_obstacks_nochange (); | |
327 | end_temporary_allocation (); | |
328 | ||
329 | /* struct cp_eh_info. This must match exception.cc. Note that this | |
330 | type is not pushed anywhere. */ | |
331 | t = make_lang_type (RECORD_TYPE); | |
332 | fields[0] = build_lang_field_decl (FIELD_DECL, get_identifier ("value"), | |
333 | ptr_type_node); | |
334 | fields[1] = build_lang_field_decl (FIELD_DECL, get_identifier ("type"), | |
335 | ptr_type_node); | |
336 | fields[2] = build_lang_field_decl | |
337 | (FIELD_DECL, get_identifier ("cleanup"), | |
338 | build_pointer_type (build_function_type | |
339 | (ptr_type_node, tree_cons | |
340 | (NULL_TREE, ptr_type_node, void_list_node)))); | |
341 | fields[3] = build_lang_field_decl (FIELD_DECL, get_identifier ("caught"), | |
342 | boolean_type_node); | |
343 | fields[4] = build_lang_field_decl (FIELD_DECL, get_identifier ("next"), | |
344 | build_pointer_type (t)); | |
20b90169 JM |
345 | fields[5] = build_lang_field_decl |
346 | (FIELD_DECL, get_identifier ("handlers"), long_integer_type_node); | |
cf9d67e3 BK |
347 | /* N.B.: The fourth field LEN is expected to be |
348 | the number of fields - 1, not the total number of fields. */ | |
20b90169 | 349 | finish_builtin_type (t, "cp_eh_info", fields, 5, ptr_type_node); |
6874c264 JM |
350 | t = build_pointer_type (t); |
351 | ||
352 | /* And now the function. */ | |
353 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
354 | build_function_type (t, void_list_node)); | |
355 | DECL_EXTERNAL (fn) = 1; | |
356 | TREE_PUBLIC (fn) = 1; | |
357 | DECL_ARTIFICIAL (fn) = 1; | |
358 | pushdecl_top_level (fn); | |
359 | make_function_rtl (fn); | |
360 | assemble_external (fn); | |
361 | pop_obstacks (); | |
362 | } | |
95e8dcba JM |
363 | return build_function_call (fn, NULL_TREE); |
364 | } | |
365 | ||
366 | /* Retrieve a pointer to the cp_eh_info node for the current exception | |
367 | and save it in the current binding level. */ | |
368 | ||
369 | static void | |
370 | push_eh_info () | |
371 | { | |
372 | tree decl, fn = call_eh_info (); | |
6874c264 JM |
373 | |
374 | /* Remember the pointer to the current exception info; it won't change | |
375 | during this catch block. */ | |
376 | decl = build_decl (VAR_DECL, get_identifier ("__exception_info"), | |
377 | TREE_TYPE (fn)); | |
378 | DECL_ARTIFICIAL (decl) = 1; | |
379 | DECL_INITIAL (decl) = fn; | |
380 | decl = pushdecl (decl); | |
381 | cp_finish_decl (decl, fn, NULL_TREE, 0, 0); | |
382 | } | |
383 | ||
384 | /* Returns a reference to the cp_eh_info node for the current exception. */ | |
385 | ||
386 | static tree | |
387 | get_eh_info () | |
388 | { | |
389 | /* Look for the pointer pushed in push_eh_info. */ | |
390 | tree t = lookup_name (get_identifier ("__exception_info"), 0); | |
391 | return build_indirect_ref (t, NULL_PTR); | |
392 | } | |
393 | ||
394 | /* Returns a reference to the current exception object. */ | |
395 | ||
396 | static tree | |
397 | get_eh_value () | |
398 | { | |
399 | return build_component_ref (get_eh_info (), get_identifier ("value"), | |
400 | NULL_TREE, 0); | |
401 | } | |
402 | ||
403 | /* Returns a reference to the current exception type. */ | |
404 | ||
405 | static tree | |
406 | get_eh_type () | |
407 | { | |
408 | return build_component_ref (get_eh_info (), get_identifier ("type"), | |
409 | NULL_TREE, 0); | |
410 | } | |
411 | ||
412 | /* Returns a reference to whether or not the current exception | |
413 | has been caught. */ | |
414 | ||
415 | static tree | |
416 | get_eh_caught () | |
417 | { | |
418 | return build_component_ref (get_eh_info (), get_identifier ("caught"), | |
419 | NULL_TREE, 0); | |
420 | } | |
421 | ||
20b90169 JM |
422 | /* Returns a reference to whether or not the current exception |
423 | has been caught. */ | |
424 | ||
425 | static tree | |
426 | get_eh_handlers () | |
427 | { | |
428 | return build_component_ref (get_eh_info (), get_identifier ("handlers"), | |
429 | NULL_TREE, 0); | |
430 | } | |
431 | ||
f30432d7 MS |
432 | /* Build a type value for use at runtime for a type that is matched |
433 | against by the exception handling system. */ | |
6467930b | 434 | |
f30432d7 MS |
435 | static tree |
436 | build_eh_type_type (type) | |
437 | tree type; | |
8d08fdba | 438 | { |
f30432d7 MS |
439 | char *typestring; |
440 | tree exp; | |
8d2733ca | 441 | |
f30432d7 MS |
442 | if (type == error_mark_node) |
443 | return error_mark_node; | |
8d2733ca | 444 | |
e92cc029 | 445 | /* peel back references, so they match. */ |
f30432d7 MS |
446 | if (TREE_CODE (type) == REFERENCE_TYPE) |
447 | type = TREE_TYPE (type); | |
8d08fdba | 448 | |
e92cc029 | 449 | /* Peel off cv qualifiers. */ |
f30432d7 | 450 | type = TYPE_MAIN_VARIANT (type); |
8d2733ca | 451 | |
f30432d7 | 452 | if (flag_rtti) |
8d08fdba | 453 | { |
f30432d7 | 454 | return build1 (ADDR_EXPR, ptr_type_node, get_typeid (type)); |
8d08fdba | 455 | } |
f30432d7 MS |
456 | |
457 | typestring = build_overload_name (type, 1, 1); | |
458 | exp = combine_strings (build_string (strlen (typestring)+1, typestring)); | |
459 | return build1 (ADDR_EXPR, ptr_type_node, exp); | |
8d08fdba | 460 | } |
8d08fdba | 461 | |
faae18ab MS |
462 | /* Build a type value for use at runtime for a exp that is thrown or |
463 | matched against by the exception handling system. */ | |
6467930b | 464 | |
faae18ab MS |
465 | static tree |
466 | build_eh_type (exp) | |
467 | tree exp; | |
468 | { | |
faae18ab MS |
469 | if (flag_rtti) |
470 | { | |
471 | exp = build_typeid (exp); | |
472 | return build1 (ADDR_EXPR, ptr_type_node, exp); | |
473 | } | |
f30432d7 | 474 | return build_eh_type_type (TREE_TYPE (exp)); |
faae18ab MS |
475 | } |
476 | ||
c7ae64f2 JM |
477 | /* Build up a call to __cp_pop_exception, to destroy the exception object |
478 | for the current catch block. HANDLER is either true or false, telling | |
479 | the library whether or not it is being called from an exception handler; | |
480 | if it is, it avoids destroying the object on rethrow. */ | |
6467930b | 481 | |
c7ae64f2 JM |
482 | static tree |
483 | do_pop_exception (handler) | |
484 | tree handler; | |
72b7eeff | 485 | { |
6874c264 | 486 | tree fn, cleanup; |
6874c264 JM |
487 | fn = get_identifier ("__cp_pop_exception"); |
488 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
489 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
490 | else | |
491 | { | |
c7ae64f2 JM |
492 | /* Declare void __cp_pop_exception (void *), |
493 | as defined in exception.cc. */ | |
6874c264 JM |
494 | push_obstacks_nochange (); |
495 | end_temporary_allocation (); | |
c7ae64f2 JM |
496 | fn = build_lang_decl |
497 | (FUNCTION_DECL, fn, | |
498 | build_function_type (void_type_node, tree_cons | |
499 | (NULL_TREE, ptr_type_node, tree_cons | |
500 | (NULL_TREE, boolean_type_node, | |
501 | void_list_node)))); | |
6874c264 JM |
502 | DECL_EXTERNAL (fn) = 1; |
503 | TREE_PUBLIC (fn) = 1; | |
504 | DECL_ARTIFICIAL (fn) = 1; | |
505 | pushdecl_top_level (fn); | |
506 | make_function_rtl (fn); | |
507 | assemble_external (fn); | |
508 | pop_obstacks (); | |
509 | } | |
72b7eeff MS |
510 | |
511 | /* Arrange to do a dynamically scoped cleanup upon exit from this region. */ | |
c7ae64f2 JM |
512 | cleanup = lookup_name (get_identifier ("__exception_info"), 0); |
513 | cleanup = build_function_call (fn, expr_tree_cons | |
514 | (NULL_TREE, cleanup, expr_tree_cons | |
515 | (NULL_TREE, handler, NULL_TREE))); | |
c0700ea5 | 516 | return cleanup; |
c7ae64f2 JM |
517 | } |
518 | ||
519 | /* This routine creates the cleanup for the current exception. */ | |
72b7eeff | 520 | |
c7ae64f2 JM |
521 | static void |
522 | push_eh_cleanup () | |
523 | { | |
524 | /* All cleanups must last longer than normal. */ | |
525 | int yes = suspend_momentary (); | |
526 | expand_decl_cleanup_no_eh (NULL_TREE, do_pop_exception (boolean_false_node)); | |
72b7eeff | 527 | resume_momentary (yes); |
72b7eeff | 528 | |
20b90169 JM |
529 | expand_expr (build_unary_op (PREINCREMENT_EXPR, get_eh_handlers (), 1), |
530 | const0_rtx, VOIDmode, EXPAND_NORMAL); | |
531 | ||
c7ae64f2 JM |
532 | /* We don't destroy the exception object on rethrow, so we can't use |
533 | the normal cleanup mechanism for it. */ | |
534 | expand_eh_region_start (); | |
535 | } | |
72b7eeff | 536 | |
8d2733ca MS |
537 | /* call this to start a catch block. Typename is the typename, and identifier |
538 | is the variable to place the object in or NULL if the variable doesn't | |
539 | matter. If typename is NULL, that means its a "catch (...)" or catch | |
540 | everything. In that case we don't need to do any type checking. | |
541 | (ie: it ends up as the "else" clause rather than an "else if" clause) */ | |
6467930b | 542 | |
8d08fdba | 543 | void |
a4443a08 MS |
544 | expand_start_catch_block (declspecs, declarator) |
545 | tree declspecs, declarator; | |
8d08fdba | 546 | { |
8d2733ca | 547 | rtx false_label_rtx; |
faae18ab | 548 | tree decl = NULL_TREE; |
a3b49ccd | 549 | tree init; |
8d2733ca | 550 | |
faf5394a MS |
551 | if (processing_template_decl) |
552 | { | |
553 | if (declspecs) | |
554 | { | |
555 | decl = grokdeclarator (declarator, declspecs, CATCHPARM, | |
556 | 1, NULL_TREE); | |
557 | pushdecl (decl); | |
558 | decl = build_min_nt (DECL_STMT, copy_to_permanent (declarator), | |
559 | copy_to_permanent (declspecs), | |
560 | NULL_TREE); | |
561 | add_tree (decl); | |
562 | } | |
563 | return; | |
564 | } | |
565 | ||
8d2733ca MS |
566 | if (! doing_eh (1)) |
567 | return; | |
568 | ||
c7ae64f2 JM |
569 | /* If we are not doing setjmp/longjmp EH, because we are reordered |
570 | out of line, we arrange to rethrow in the outer context so as to | |
571 | skip through the terminate region we are nested in, should we | |
572 | encounter an exception in the catch handler. We also need to do | |
573 | this because we are not physically within the try block, if any, | |
574 | that contains this catch block. | |
575 | ||
576 | Matches the end in expand_end_catch_block. */ | |
25d5eb3f JM |
577 | if (! exceptions_via_longjmp) |
578 | expand_eh_region_start (); | |
c7ae64f2 JM |
579 | |
580 | /* Create a binding level for the eh_info and the exception object | |
581 | cleanup. */ | |
c11b6f21 | 582 | pushlevel (0); |
a3b49ccd MS |
583 | expand_start_bindings (0); |
584 | ||
f675499c | 585 | false_label_rtx = gen_label_rtx (); |
72b7eeff | 586 | push_label_entry (&false_label_stack, false_label_rtx, NULL_TREE); |
a3b49ccd | 587 | |
eb66be0e MS |
588 | emit_line_note (input_filename, lineno); |
589 | ||
6874c264 JM |
590 | push_eh_info (); |
591 | ||
faae18ab | 592 | if (declspecs) |
8d08fdba | 593 | { |
c11b6f21 | 594 | decl = grokdeclarator (declarator, declspecs, CATCHPARM, 1, NULL_TREE); |
faae18ab MS |
595 | |
596 | if (decl == NULL_TREE) | |
c7ae64f2 JM |
597 | error ("invalid catch parameter"); |
598 | } | |
95e8dcba | 599 | |
c7ae64f2 JM |
600 | if (decl) |
601 | { | |
602 | tree exp; | |
603 | rtx call_rtx, return_value_rtx; | |
604 | tree init_type; | |
faae18ab | 605 | |
be99da77 MS |
606 | /* Make sure we mark the catch param as used, otherwise we'll get |
607 | a warning about an unused ((anonymous)). */ | |
608 | TREE_USED (decl) = 1; | |
609 | ||
e92cc029 | 610 | /* Figure out the type that the initializer is. */ |
faae18ab | 611 | init_type = TREE_TYPE (decl); |
f30432d7 MS |
612 | if (TREE_CODE (init_type) != REFERENCE_TYPE |
613 | && TREE_CODE (init_type) != POINTER_TYPE) | |
faae18ab MS |
614 | init_type = build_reference_type (init_type); |
615 | ||
6874c264 | 616 | exp = get_eh_value (); |
e66d884e | 617 | exp = expr_tree_cons (NULL_TREE, |
f30432d7 | 618 | build_eh_type_type (TREE_TYPE (decl)), |
e66d884e | 619 | expr_tree_cons (NULL_TREE, |
6874c264 | 620 | get_eh_type (), |
e66d884e | 621 | expr_tree_cons (NULL_TREE, exp, NULL_TREE))); |
faae18ab MS |
622 | exp = build_function_call (CatchMatch, exp); |
623 | call_rtx = expand_call (exp, NULL_RTX, 0); | |
e1cd6e56 | 624 | assemble_external (TREE_OPERAND (CatchMatch, 0)); |
8d2733ca | 625 | |
faae18ab | 626 | return_value_rtx = hard_function_value (ptr_type_node, exp); |
8d2733ca MS |
627 | |
628 | /* did the throw type match function return TRUE? */ | |
faae18ab | 629 | emit_cmp_insn (return_value_rtx, const0_rtx, EQ, NULL_RTX, |
8d2733ca MS |
630 | GET_MODE (return_value_rtx), 0, 0); |
631 | ||
632 | /* if it returned FALSE, jump over the catch block, else fall into it */ | |
faae18ab MS |
633 | emit_jump_insn (gen_beq (false_label_rtx)); |
634 | ||
95e8dcba JM |
635 | push_eh_cleanup (); |
636 | ||
c7ae64f2 JM |
637 | /* Create a binding level for the parm. */ |
638 | pushlevel (0); | |
639 | expand_start_bindings (0); | |
640 | ||
641 | init = convert_from_reference (make_tree (init_type, call_rtx)); | |
642 | ||
643 | /* If the constructor for the catch parm exits via an exception, we | |
644 | must call terminate. See eh23.C. */ | |
645 | if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))) | |
646 | { | |
647 | /* Generate the copy constructor call directly so we can wrap it. | |
648 | See also expand_default_init. */ | |
649 | init = ocp_convert (TREE_TYPE (decl), init, | |
650 | CONV_IMPLICIT|CONV_FORCE_TEMP, 0); | |
651 | init = build (TRY_CATCH_EXPR, TREE_TYPE (init), init, | |
652 | TerminateFunctionCall); | |
653 | } | |
faae18ab | 654 | |
b3417a04 | 655 | /* Let `cp_finish_decl' know that this initializer is ok. */ |
faae18ab MS |
656 | DECL_INITIAL (decl) = init; |
657 | decl = pushdecl (decl); | |
c7ae64f2 | 658 | |
b3417a04 | 659 | cp_finish_decl (decl, init, NULL_TREE, 0, LOOKUP_ONLYCONVERTING); |
8d08fdba | 660 | } |
95e8dcba JM |
661 | else |
662 | { | |
663 | push_eh_cleanup (); | |
664 | ||
c7ae64f2 JM |
665 | /* Create a binding level for the parm. */ |
666 | pushlevel (0); | |
667 | expand_start_bindings (0); | |
668 | ||
95e8dcba JM |
669 | /* Fall into the catch all section. */ |
670 | } | |
72b7eeff | 671 | |
6874c264 JM |
672 | init = build_modify_expr (get_eh_caught (), NOP_EXPR, integer_one_node); |
673 | expand_expr (init, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
f30432d7 | 674 | |
6467930b MS |
675 | emit_line_note (input_filename, lineno); |
676 | } | |
f30432d7 | 677 | |
f30432d7 | 678 | |
f30432d7 | 679 | |
8d2733ca MS |
680 | /* Call this to end a catch block. Its responsible for emitting the |
681 | code to handle jumping back to the correct place, and for emitting | |
682 | the label to jump to if this catch block didn't match. */ | |
6467930b | 683 | |
824b9a4c MS |
684 | void |
685 | expand_end_catch_block () | |
8d08fdba | 686 | { |
f30432d7 MS |
687 | if (! doing_eh (1)) |
688 | return; | |
8d2733ca | 689 | |
c7ae64f2 JM |
690 | /* Cleanup the EH parameter. */ |
691 | expand_end_bindings (getdecls (), kept_level_p (), 0); | |
692 | poplevel (kept_level_p (), 1, 0); | |
693 | ||
694 | /* Matches push_eh_cleanup. */ | |
695 | expand_eh_region_end (do_pop_exception (boolean_true_node)); | |
696 | ||
697 | /* Cleanup the EH object. */ | |
698 | expand_end_bindings (getdecls (), kept_level_p (), 0); | |
699 | poplevel (kept_level_p (), 1, 0); | |
eb66be0e | 700 | |
0b3ca5ee | 701 | if (! exceptions_via_longjmp) |
eb66be0e MS |
702 | { |
703 | /* If we are not doing setjmp/longjmp EH, we need an extra | |
704 | region around the whole catch block to skip through the | |
705 | terminate region we are nested in. */ | |
706 | ||
25d5eb3f JM |
707 | tree t = make_node (RTL_EXPR); |
708 | TREE_TYPE (t) = void_type_node; | |
709 | RTL_EXPR_RTL (t) = const0_rtx; | |
710 | TREE_SIDE_EFFECTS (t) = 1; | |
711 | do_pending_stack_adjust (); | |
712 | start_sequence_for_rtl_expr (t); | |
713 | ||
714 | expand_internal_throw (outer_context_label_stack->u.rlabel); | |
eb66be0e | 715 | |
25d5eb3f JM |
716 | do_pending_stack_adjust (); |
717 | RTL_EXPR_SEQUENCE (t) = get_insns (); | |
718 | end_sequence (); | |
f30432d7 | 719 | |
25d5eb3f JM |
720 | /* For the rethrow region. */ |
721 | expand_eh_region_end (t); | |
722 | } | |
f30432d7 | 723 | |
eb66be0e MS |
724 | /* Fall to outside the try statement when done executing handler and |
725 | we fall off end of handler. This is jump Lresume in the | |
726 | documentation. */ | |
727 | expand_goto (top_label_entry (&caught_return_label_stack)); | |
728 | ||
6467930b | 729 | expand_leftover_cleanups (); |
f30432d7 | 730 | |
6467930b | 731 | /* label we emit to jump to if this catch block didn't match. */ |
f30432d7 MS |
732 | /* This the closing } in the `if (eq) {' of the documentation. */ |
733 | emit_label (pop_label_entry (&false_label_stack)); | |
8d2733ca | 734 | } |
8d08fdba | 735 | |
6467930b MS |
736 | /* unwind the stack. */ |
737 | ||
db5ae43f | 738 | static void |
f30432d7 MS |
739 | do_unwind (inner_throw_label) |
740 | rtx inner_throw_label; | |
db5ae43f | 741 | { |
be99da77 | 742 | #if defined (SPARC_STACK_ALIGN) /* was sparc */ |
0021b564 JM |
743 | /* This doesn't work for the flat model sparc, nor does it need to |
744 | as the default unwinder is only used to unwind non-flat frames. */ | |
db5ae43f MS |
745 | tree fcall; |
746 | tree params; | |
6633d636 | 747 | rtx next_pc; |
f30432d7 | 748 | rtx temp; |
db5ae43f | 749 | |
eb66be0e | 750 | /* Call to __builtin_return_address. */ |
e66d884e | 751 | params = expr_tree_cons (NULL_TREE, integer_zero_node, NULL_TREE); |
db5ae43f | 752 | fcall = build_function_call (BuiltinReturnAddress, params); |
6633d636 | 753 | next_pc = expand_expr (fcall, NULL_RTX, Pmode, 0); |
ddd5a7c1 | 754 | /* In the return, the new pc is pc+8, as the value coming in is |
db5ae43f | 755 | really the address of the call insn, not the next insn. */ |
f30432d7 MS |
756 | temp = gen_reg_rtx (Pmode); |
757 | emit_move_insn (temp, inner_throw_label); | |
6633d636 | 758 | emit_move_insn (next_pc, plus_constant (temp, -8)); |
d11ad92e | 759 | emit_insn (gen_rtx (USE, VOIDmode, gen_rtx (REG, SImode, 31))); |
db5ae43f MS |
760 | easy_expand_asm ("ret"); |
761 | easy_expand_asm ("restore"); | |
762 | emit_barrier (); | |
763 | #endif | |
be99da77 | 764 | #if defined (ARM_FRAME_RTX) /* was __arm */ |
f30432d7 MS |
765 | if (flag_omit_frame_pointer) |
766 | sorry ("this implementation of exception handling requires a frame pointer"); | |
db5ae43f | 767 | |
f30432d7 MS |
768 | emit_move_insn (stack_pointer_rtx, |
769 | gen_rtx (MEM, Pmode, plus_constant (hard_frame_pointer_rtx, -8))); | |
770 | emit_move_insn (hard_frame_pointer_rtx, | |
771 | gen_rtx (MEM, Pmode, plus_constant (hard_frame_pointer_rtx, -12))); | |
db5ae43f | 772 | #endif |
be99da77 | 773 | #if defined (TARGET_88000) /* was m88k */ |
db5ae43f MS |
774 | rtx temp_frame = frame_pointer_rtx; |
775 | ||
776 | temp_frame = memory_address (Pmode, temp_frame); | |
777 | temp_frame = copy_to_reg (gen_rtx (MEM, Pmode, temp_frame)); | |
778 | ||
779 | /* hopefully this will successfully pop the frame! */ | |
780 | emit_move_insn (frame_pointer_rtx, temp_frame); | |
781 | emit_move_insn (stack_pointer_rtx, frame_pointer_rtx); | |
782 | emit_move_insn (arg_pointer_rtx, frame_pointer_rtx); | |
783 | emit_insn (gen_add2_insn (stack_pointer_rtx, gen_rtx (CONST_INT, VOIDmode, | |
784 | (HOST_WIDE_INT)m88k_debugger_offset (stack_pointer_rtx, 0)))); | |
785 | ||
786 | #if 0 | |
787 | emit_insn (gen_add2_insn (arg_pointer_rtx, gen_rtx (CONST_INT, VOIDmode, | |
788 | -(HOST_WIDE_INT)m88k_debugger_offset (arg_pointer_rtx, 0)))); | |
789 | ||
790 | emit_move_insn (stack_pointer_rtx, arg_pointer_rtx); | |
791 | ||
792 | emit_insn (gen_add2_insn (stack_pointer_rtx, gen_rtx (CONST_INT, VOIDmode, | |
793 | (HOST_WIDE_INT)m88k_debugger_offset (arg_pointer_rtx, 0)))); | |
794 | #endif | |
795 | #endif | |
be99da77 | 796 | #if ! defined (TARGET_88000) && ! defined (ARM_FRAME_RTX) && ! defined (SPARC_STACK_ALIGN) |
f30432d7 MS |
797 | tree fcall; |
798 | tree params; | |
6633d636 | 799 | rtx next_pc; |
e1cd6e56 | 800 | |
be99da77 | 801 | #if 0 |
e92cc029 | 802 | /* I would like to do this here, but the move below doesn't seem to work. */ |
eb66be0e | 803 | /* Call to __builtin_return_address. */ |
e66d884e | 804 | params = expr_tree_cons (NULL_TREE, integer_zero_node, NULL_TREE); |
f30432d7 | 805 | fcall = build_function_call (BuiltinReturnAddress, params); |
6633d636 | 806 | next_pc = expand_expr (fcall, NULL_RTX, Pmode, 0); |
be99da77 | 807 | |
6633d636 | 808 | emit_move_insn (next_pc, inner_throw_label); |
e92cc029 | 809 | /* So, for now, just pass throw label to stack unwinder. */ |
f30432d7 | 810 | #endif |
e66d884e | 811 | params = expr_tree_cons (NULL_TREE, make_tree (ptr_type_node, |
f30432d7 MS |
812 | inner_throw_label), NULL_TREE); |
813 | ||
814 | do_function_call (Unwind, params, NULL_TREE); | |
815 | assemble_external (TREE_OPERAND (Unwind, 0)); | |
816 | emit_barrier (); | |
e1cd6e56 | 817 | #endif |
db5ae43f | 818 | } |
8d08fdba | 819 | |
f30432d7 | 820 | |
eb66be0e | 821 | /* Is called from expand_exception_blocks to generate the code in a function |
ddd5a7c1 | 822 | to "throw" if anything in the function needs to perform a throw. |
8d08fdba | 823 | |
ddd5a7c1 | 824 | expands "throw" as the following pseudo code: |
8d2733ca MS |
825 | |
826 | throw: | |
827 | eh = find_first_exception_match (saved_pc); | |
828 | if (!eh) goto gotta_rethrow_it; | |
829 | goto eh; | |
830 | ||
831 | gotta_rethrow_it: | |
832 | saved_pc = __builtin_return_address (0); | |
833 | pop_to_previous_level (); | |
6467930b | 834 | goto throw; */ |
8d2733ca | 835 | |
f30432d7 | 836 | void |
8d2733ca MS |
837 | expand_builtin_throw () |
838 | { | |
0021b564 | 839 | #ifndef DWARF2_UNWIND_INFO |
8d2733ca MS |
840 | tree fcall; |
841 | tree params; | |
6633d636 MS |
842 | rtx handler; |
843 | rtx saved_pcnthrow; | |
844 | rtx next_pc; | |
f30432d7 MS |
845 | rtx gotta_rethrow_it; |
846 | rtx gotta_call_terminate; | |
6633d636 | 847 | rtx after_unwind; |
f30432d7 | 848 | rtx top_of_loop; |
f30432d7 | 849 | tree t; |
6633d636 | 850 | rtx x; |
f30432d7 MS |
851 | |
852 | if (! doing_eh (0)) | |
853 | return; | |
854 | ||
855 | if (! throw_used) | |
856 | return; | |
8d2733ca | 857 | |
f30432d7 | 858 | params = void_list_node; |
c11b6f21 MS |
859 | t = make_call_declarator (get_identifier ("__throw"), params, NULL_TREE, |
860 | NULL_TREE); | |
6633d636 MS |
861 | start_function (decl_tree_cons (NULL_TREE, |
862 | get_identifier ("void"), | |
863 | decl_tree_cons (NULL_TREE, | |
864 | get_identifier ("static"), | |
865 | NULL_TREE)), | |
c11b6f21 | 866 | t, NULL_TREE, 0); |
f30432d7 MS |
867 | store_parm_decls (); |
868 | pushlevel (0); | |
869 | clear_last_expr (); | |
870 | push_momentary (); | |
871 | expand_start_bindings (0); | |
872 | ||
873 | gotta_rethrow_it = gen_label_rtx (); | |
874 | gotta_call_terminate = gen_label_rtx (); | |
f30432d7 | 875 | |
a50f0918 | 876 | /* These two can be frontend specific. If wanted, they can go in |
e92cc029 | 877 | expand_throw. */ |
a50f0918 | 878 | /* Do we have a valid object we are throwing? */ |
95e8dcba JM |
879 | t = call_eh_info (); |
880 | emit_cmp_insn (expand_expr (t, NULL_RTX, Pmode, 0), | |
881 | const0_rtx, EQ, NULL_RTX, | |
5a0fa1de | 882 | GET_MODE (DECL_RTL (t)), 0, 0); |
a50f0918 MS |
883 | emit_jump_insn (gen_beq (gotta_call_terminate)); |
884 | ||
8d2733ca | 885 | /* search for an exception handler for the saved_pc */ |
6633d636 | 886 | handler = do_function_call (FirstExceptionMatch, |
e66d884e | 887 | expr_tree_cons (NULL_TREE, saved_pc, |
6633d636 MS |
888 | NULL_TREE), |
889 | ptr_type_node); | |
e1cd6e56 | 890 | assemble_external (TREE_OPERAND (FirstExceptionMatch, 0)); |
8d2733ca MS |
891 | |
892 | /* did we find one? */ | |
6633d636 MS |
893 | emit_cmp_insn (handler, const0_rtx, EQ, NULL_RTX, |
894 | GET_MODE (handler), 0, 0); | |
8d2733ca MS |
895 | |
896 | /* if not, jump to gotta_rethrow_it */ | |
897 | emit_jump_insn (gen_beq (gotta_rethrow_it)); | |
898 | ||
6633d636 MS |
899 | { |
900 | rtx ret_val, x; | |
901 | ret_val = expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS, | |
902 | 0, hard_frame_pointer_rtx); | |
8d2733ca | 903 | |
6633d636 MS |
904 | /* Set it up so that we continue at the handler. */ |
905 | emit_move_insn (ret_val, handler); | |
906 | #ifdef RETURN_ADDR_OFFSET | |
907 | x = plus_constant (ret_val, -RETURN_ADDR_OFFSET); | |
908 | if (x != ret_val) | |
909 | emit_move_insn (ret_val, x); | |
910 | #endif | |
8d2733ca | 911 | |
6633d636 MS |
912 | expand_null_return (); |
913 | } | |
914 | ||
915 | top_of_loop = gen_label_rtx (); | |
916 | emit_label (top_of_loop); | |
917 | ||
918 | #ifdef DONT_ACCESS_GBLS_AFTER_EPILOGUE | |
919 | if (DONT_ACCESS_GBLS_AFTER_EPILOGUE) | |
920 | { | |
921 | saved_pcnthrow = gen_reg_rtx (Pmode); | |
922 | emit_move_insn (saved_pcnthrow, hard_function_value (ptr_type_node, | |
923 | NULL_TREE)); | |
924 | } | |
925 | #endif | |
926 | ||
eb66be0e | 927 | /* Call to __builtin_return_address. */ |
be99da77 MS |
928 | #if defined (ARM_FRAME_RTX) /* was __arm */ |
929 | /* This should be moved into arm.h:RETURN_ADDR_RTX */ | |
930 | /* This replaces a 'call' to __builtin_return_address */ | |
6633d636 MS |
931 | next_pc = gen_reg_rtx (Pmode); |
932 | emit_move_insn (next_pc, | |
933 | gen_rtx (MEM, Pmode, plus_constant (hard_frame_pointer_rtx, -4))); | |
e1cd6e56 | 934 | #else |
e66d884e | 935 | params = expr_tree_cons (NULL_TREE, integer_zero_node, NULL_TREE); |
8d2733ca | 936 | fcall = build_function_call (BuiltinReturnAddress, params); |
6633d636 | 937 | next_pc = expand_expr (fcall, NULL_RTX, Pmode, 0); |
e1cd6e56 | 938 | #endif |
8d2733ca | 939 | |
eb66be0e | 940 | /* Did __builtin_return_address return a valid address? */ |
6633d636 MS |
941 | emit_cmp_insn (next_pc, const0_rtx, EQ, NULL_RTX, |
942 | GET_MODE (next_pc), 0, 0); | |
8d2733ca MS |
943 | |
944 | emit_jump_insn (gen_beq (gotta_call_terminate)); | |
945 | ||
6633d636 | 946 | next_pc = eh_outer_context (next_pc); |
e1cd6e56 | 947 | |
be99da77 | 948 | /* Yes it did. */ |
6633d636 MS |
949 | #ifdef DONT_ACCESS_GBLS_AFTER_EPILOGUE |
950 | if (DONT_ACCESS_GBLS_AFTER_EPILOGUE) | |
951 | { | |
952 | rtx x; | |
953 | ||
954 | x = validize_mem (gen_rtx (MEM, Pmode, saved_pcnthrow)); | |
955 | emit_move_insn (validize_mem (gen_rtx (MEM, Pmode, x)), | |
956 | next_pc); | |
957 | #ifdef FUNCTION_OUTGOING_VALUE | |
958 | emit_move_insn (FUNCTION_OUTGOING_VALUE (ptr_type_node, NULL_TREE), | |
959 | validize_mem (gen_rtx (MEM, Pmode, | |
960 | plus_constant (saved_pcnthrow, | |
961 | GET_MODE_SIZE (Pmode))))); | |
962 | emit_insn (gen_rtx (USE, VOIDmode, | |
963 | FUNCTION_OUTGOING_VALUE (ptr_type_node, NULL_TREE))); | |
964 | #endif | |
965 | } | |
966 | else | |
967 | #endif | |
968 | emit_move_insn (eh_saved_pc_rtx, next_pc); | |
f30432d7 | 969 | |
6633d636 MS |
970 | after_unwind = gen_label_rtx (); |
971 | do_unwind (gen_rtx (LABEL_REF, Pmode, after_unwind)); | |
972 | ||
973 | emit_label (after_unwind); | |
974 | ||
975 | #ifdef DONT_ACCESS_GBLS_AFTER_EPILOGUE | |
976 | if (DONT_ACCESS_GBLS_AFTER_EPILOGUE) | |
977 | { | |
6874c264 JM |
978 | t = build_function_type (void_type_node, void_list_node); |
979 | t = make_tree (build_pointer_type (t), | |
6633d636 MS |
980 | hard_function_value (ptr_type_node, |
981 | NULL_TREE)); | |
982 | t = build_function_call (t, NULL_TREE); | |
983 | expand_expr (t, const0_rtx, VOIDmode, 0); | |
984 | } | |
985 | else | |
986 | #endif | |
987 | emit_throw (); | |
8d2733ca MS |
988 | |
989 | /* no it didn't --> therefore we need to call terminate */ | |
990 | emit_label (gotta_call_terminate); | |
991 | do_function_call (Terminate, NULL_TREE, NULL_TREE); | |
e1cd6e56 | 992 | assemble_external (TREE_OPERAND (Terminate, 0)); |
f30432d7 MS |
993 | |
994 | { | |
6633d636 MS |
995 | rtx ret_val, x; |
996 | /* code to deal with unwinding and looking for it again */ | |
997 | emit_label (gotta_rethrow_it); | |
f30432d7 MS |
998 | ret_val = expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS, |
999 | 0, hard_frame_pointer_rtx); | |
1000 | ||
1001 | /* Set it up so that we continue inside, at the top of the loop. */ | |
1002 | emit_move_insn (ret_val, gen_rtx (LABEL_REF, Pmode, top_of_loop)); | |
21451173 | 1003 | #ifdef RETURN_ADDR_OFFSET |
6633d636 MS |
1004 | x = plus_constant (ret_val, -RETURN_ADDR_OFFSET); |
1005 | if (x != ret_val) | |
1006 | emit_move_insn (ret_val, x); | |
1007 | #endif | |
1008 | ||
1009 | #ifdef DONT_ACCESS_GBLS_AFTER_EPILOGUE | |
1010 | if (DONT_ACCESS_GBLS_AFTER_EPILOGUE) | |
1011 | { | |
1012 | rtx x = emit_library_call_value (gen_rtx (SYMBOL_REF, Pmode, | |
1013 | "__eh_pcnthrow"), | |
1014 | NULL_RTX, 1, | |
1015 | Pmode, 0); | |
1016 | /* This is to get a version of throw that will throw properly. */ | |
1017 | emit_move_insn (validize_mem (gen_rtx (MEM, Pmode, | |
1018 | plus_constant (x, GET_MODE_SIZE (Pmode)))), | |
1019 | throw_libfunc); | |
1020 | #ifdef FUNCTION_OUTGOING_VALUE | |
1021 | emit_move_insn (FUNCTION_OUTGOING_VALUE (ptr_type_node, NULL_TREE), | |
1022 | x); | |
1023 | emit_insn (gen_rtx (USE, VOIDmode, FUNCTION_OUTGOING_VALUE (ptr_type_node, NULL_TREE))); | |
1024 | #endif | |
1025 | } | |
f30432d7 MS |
1026 | #endif |
1027 | ||
e92cc029 | 1028 | /* Fall into epilogue to unwind prologue. */ |
f30432d7 MS |
1029 | } |
1030 | ||
fc378698 | 1031 | expand_end_bindings (getdecls (), 1, 0); |
f30432d7 MS |
1032 | poplevel (1, 0, 0); |
1033 | pop_momentary (); | |
1034 | ||
1035 | finish_function (lineno, 0, 0); | |
0021b564 | 1036 | #endif /* DWARF2_UNWIND_INFO */ |
8d08fdba | 1037 | } |
8d2733ca | 1038 | |
6c20b7e9 JM |
1039 | /* An exception spec is implemented more or less like: |
1040 | ||
1041 | try { | |
1042 | function body; | |
1043 | } catch (...) { | |
1044 | void *p[] = { typeid(raises) }; | |
1045 | __check_eh_spec (p, count); | |
1046 | } | |
1047 | ||
1048 | __check_eh_spec in exception.cc handles all the details. */ | |
8d2733ca | 1049 | |
f30432d7 MS |
1050 | void |
1051 | expand_start_eh_spec () | |
1052 | { | |
6c20b7e9 | 1053 | expand_start_try_stmts (); |
f30432d7 MS |
1054 | } |
1055 | ||
5566b478 | 1056 | static void |
f30432d7 MS |
1057 | expand_end_eh_spec (raises) |
1058 | tree raises; | |
1059 | { | |
6c20b7e9 JM |
1060 | tree tmp, fn, decl, types = NULL_TREE; |
1061 | int count = 0; | |
f30432d7 | 1062 | |
6c20b7e9 JM |
1063 | expand_start_all_catch (); |
1064 | expand_start_catch_block (NULL_TREE, NULL_TREE); | |
f30432d7 | 1065 | |
6c20b7e9 JM |
1066 | /* Build up an array of type_infos. */ |
1067 | for (; raises && TREE_VALUE (raises); raises = TREE_CHAIN (raises)) | |
1068 | { | |
1069 | types = expr_tree_cons | |
1070 | (NULL_TREE, build_eh_type_type (TREE_VALUE (raises)), types); | |
1071 | ++count; | |
1072 | } | |
eb66be0e | 1073 | |
6c20b7e9 JM |
1074 | types = build_nt (CONSTRUCTOR, NULL_TREE, types); |
1075 | TREE_HAS_CONSTRUCTOR (types) = 1; | |
6874c264 | 1076 | |
6c20b7e9 JM |
1077 | /* We can't pass the CONSTRUCTOR directly, so stick it in a variable. */ |
1078 | tmp = build_array_type (const_ptr_type_node, NULL_TREE); | |
1079 | decl = build_decl (VAR_DECL, NULL_TREE, tmp); | |
1080 | DECL_ARTIFICIAL (decl) = 1; | |
1081 | DECL_INITIAL (decl) = types; | |
1082 | cp_finish_decl (decl, types, NULL_TREE, 0, 0); | |
1083 | ||
1084 | decl = decay_conversion (decl); | |
6874c264 | 1085 | |
6c20b7e9 JM |
1086 | fn = get_identifier ("__check_eh_spec"); |
1087 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
1088 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
1089 | else | |
f30432d7 | 1090 | { |
6c20b7e9 JM |
1091 | push_obstacks_nochange (); |
1092 | end_temporary_allocation (); | |
f30432d7 | 1093 | |
6c20b7e9 JM |
1094 | tmp = tree_cons |
1095 | (NULL_TREE, integer_type_node, tree_cons | |
1096 | (NULL_TREE, TREE_TYPE (decl), void_list_node)); | |
1097 | tmp = build_function_type (void_type_node, tmp); | |
f30432d7 | 1098 | |
6c20b7e9 JM |
1099 | fn = build_lang_decl (FUNCTION_DECL, fn, tmp); |
1100 | DECL_EXTERNAL (fn) = 1; | |
1101 | TREE_PUBLIC (fn) = 1; | |
1102 | DECL_ARTIFICIAL (fn) = 1; | |
1103 | TREE_THIS_VOLATILE (fn) = 1; | |
1104 | pushdecl_top_level (fn); | |
1105 | make_function_rtl (fn); | |
1106 | assemble_external (fn); | |
1107 | pop_obstacks (); | |
1108 | } | |
1109 | ||
1110 | tmp = expr_tree_cons (NULL_TREE, build_int_2 (count, 0), expr_tree_cons | |
1111 | (NULL_TREE, decl, NULL_TREE)); | |
1112 | tmp = build_call (fn, TREE_TYPE (TREE_TYPE (fn)), tmp); | |
1113 | expand_expr (tmp, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
1114 | ||
1115 | expand_end_catch_block (); | |
1116 | expand_end_all_catch (); | |
f30432d7 MS |
1117 | } |
1118 | ||
8d2733ca MS |
1119 | /* This is called to expand all the toplevel exception handling |
1120 | finalization for a function. It should only be called once per | |
1121 | function. */ | |
6467930b | 1122 | |
8d08fdba | 1123 | void |
8d2733ca | 1124 | expand_exception_blocks () |
8d08fdba | 1125 | { |
92b96838 | 1126 | do_pending_stack_adjust (); |
e00737d2 | 1127 | push_to_sequence (catch_clauses); |
8d2733ca | 1128 | expand_leftover_cleanups (); |
92b96838 | 1129 | do_pending_stack_adjust (); |
e00737d2 | 1130 | catch_clauses = get_insns (); |
f30432d7 | 1131 | end_sequence (); |
eb448459 | 1132 | |
eb448459 MS |
1133 | /* Do this after we expand leftover cleanups, so that the |
1134 | expand_eh_region_end that expand_end_eh_spec does will match the | |
1135 | right expand_eh_region_start, and make sure it comes out before | |
1136 | the terminate protected region. */ | |
f30432d7 MS |
1137 | if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl))) |
1138 | { | |
eb448459 | 1139 | expand_end_eh_spec (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl))); |
92b96838 | 1140 | do_pending_stack_adjust (); |
e00737d2 | 1141 | push_to_sequence (catch_clauses); |
eb448459 | 1142 | expand_leftover_cleanups (); |
92b96838 | 1143 | do_pending_stack_adjust (); |
e00737d2 | 1144 | catch_clauses = get_insns (); |
eb448459 | 1145 | end_sequence (); |
f30432d7 MS |
1146 | } |
1147 | ||
e00737d2 | 1148 | if (catch_clauses) |
f30432d7 | 1149 | { |
e00737d2 MS |
1150 | rtx funcend = gen_label_rtx (); |
1151 | emit_jump (funcend); | |
1152 | ||
eb66be0e MS |
1153 | /* We cannot protect n regions this way if we must flow into the |
1154 | EH region through the top of the region, as we have to with | |
1155 | the setjmp/longjmp approach. */ | |
1156 | if (exceptions_via_longjmp == 0) | |
1157 | { | |
1158 | /* Is this necessary? */ | |
1159 | assemble_external (TREE_OPERAND (Terminate, 0)); | |
1160 | ||
1161 | expand_eh_region_start (); | |
1162 | } | |
f30432d7 | 1163 | |
e00737d2 MS |
1164 | emit_insns (catch_clauses); |
1165 | catch_clauses = NULL_RTX; | |
eb66be0e MS |
1166 | |
1167 | if (exceptions_via_longjmp == 0) | |
1168 | expand_eh_region_end (TerminateFunctionCall); | |
1169 | ||
6467930b | 1170 | expand_leftover_cleanups (); |
f30432d7 | 1171 | |
e00737d2 MS |
1172 | emit_label (funcend); |
1173 | } | |
8d08fdba MS |
1174 | } |
1175 | ||
72b7eeff MS |
1176 | tree |
1177 | start_anon_func () | |
1178 | { | |
1179 | static int counter = 0; | |
e92cc029 | 1180 | int old_interface_unknown = interface_unknown; |
72b7eeff MS |
1181 | char name[32]; |
1182 | tree params; | |
1183 | tree t; | |
1184 | ||
1185 | push_cp_function_context (NULL_TREE); | |
1186 | push_to_top_level (); | |
1187 | ||
1188 | /* No need to mangle this. */ | |
1189 | push_lang_context (lang_name_c); | |
1190 | ||
e92cc029 MS |
1191 | interface_unknown = 1; |
1192 | ||
72b7eeff MS |
1193 | params = void_list_node; |
1194 | /* tcf stands for throw clean funciton. */ | |
1195 | sprintf (name, "__tcf_%d", counter++); | |
c11b6f21 MS |
1196 | t = make_call_declarator (get_identifier (name), params, NULL_TREE, |
1197 | NULL_TREE); | |
72b7eeff MS |
1198 | start_function (decl_tree_cons (NULL_TREE, get_identifier ("static"), |
1199 | void_list_node), | |
c11b6f21 | 1200 | t, NULL_TREE, 0); |
72b7eeff MS |
1201 | store_parm_decls (); |
1202 | pushlevel (0); | |
1203 | clear_last_expr (); | |
1204 | push_momentary (); | |
1205 | expand_start_bindings (0); | |
1206 | emit_line_note (input_filename, lineno); | |
1207 | ||
e92cc029 MS |
1208 | interface_unknown = old_interface_unknown; |
1209 | ||
72b7eeff MS |
1210 | pop_lang_context (); |
1211 | ||
1212 | return current_function_decl; | |
1213 | } | |
1214 | ||
1215 | void | |
1216 | end_anon_func () | |
1217 | { | |
fc378698 | 1218 | expand_end_bindings (getdecls (), 1, 0); |
72b7eeff MS |
1219 | poplevel (1, 0, 0); |
1220 | pop_momentary (); | |
1221 | ||
1222 | finish_function (lineno, 0, 0); | |
1223 | ||
1224 | pop_from_top_level (); | |
1225 | pop_cp_function_context (NULL_TREE); | |
1226 | } | |
8d2733ca | 1227 | |
6467930b | 1228 | /* Expand a throw statement. This follows the following |
8d2733ca MS |
1229 | algorithm: |
1230 | ||
1231 | 1. Allocate space to save the current PC onto the stack. | |
1232 | 2. Generate and emit a label and save its address into the | |
e1cd6e56 | 1233 | newly allocated stack space since we can't save the pc directly. |
8d2733ca MS |
1234 | 3. If this is the first call to throw in this function: |
1235 | generate a label for the throw block | |
1236 | 4. jump to the throw block label. */ | |
6467930b | 1237 | |
8d08fdba | 1238 | void |
8d2733ca MS |
1239 | expand_throw (exp) |
1240 | tree exp; | |
8d08fdba | 1241 | { |
8d2733ca | 1242 | rtx label; |
6874c264 JM |
1243 | tree fn; |
1244 | static tree cleanup_type; | |
8d08fdba | 1245 | |
8d2733ca MS |
1246 | if (! doing_eh (1)) |
1247 | return; | |
8d08fdba | 1248 | |
8d2733ca MS |
1249 | if (exp) |
1250 | { | |
faae18ab | 1251 | tree throw_type; |
6874c264 | 1252 | tree cleanup = NULL_TREE, e; |
faae18ab | 1253 | |
a3b49ccd | 1254 | /* throw expression */ |
e92cc029 | 1255 | /* First, decay it. */ |
f30432d7 | 1256 | exp = decay_conversion (exp); |
a3b49ccd | 1257 | |
6874c264 JM |
1258 | /* cleanup_type is void (*)(void *, int), |
1259 | the internal type of a destructor. */ | |
1260 | if (cleanup_type == NULL_TREE) | |
1261 | { | |
1262 | push_obstacks_nochange (); | |
1263 | end_temporary_allocation (); | |
1264 | cleanup_type = build_pointer_type | |
1265 | (build_function_type | |
1266 | (void_type_node, tree_cons | |
1267 | (NULL_TREE, ptr_type_node, tree_cons | |
1268 | (NULL_TREE, integer_type_node, void_list_node)))); | |
1269 | pop_obstacks (); | |
1270 | } | |
1271 | ||
f30432d7 MS |
1272 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) |
1273 | { | |
1274 | throw_type = build_eh_type (exp); | |
1275 | exp = build_reinterpret_cast (ptr_type_node, exp); | |
1276 | } | |
1277 | else | |
1278 | { | |
72b7eeff | 1279 | tree object; |
a50f0918 | 1280 | |
f30432d7 MS |
1281 | /* Make a copy of the thrown object. WP 15.1.5 */ |
1282 | exp = build_new (NULL_TREE, TREE_TYPE (exp), | |
e66d884e | 1283 | build_expr_list (NULL_TREE, exp), |
f30432d7 | 1284 | 0); |
faae18ab | 1285 | |
f30432d7 MS |
1286 | if (exp == error_mark_node) |
1287 | error (" in thrown expression"); | |
faae18ab | 1288 | |
72b7eeff MS |
1289 | object = build_indirect_ref (exp, NULL_PTR); |
1290 | throw_type = build_eh_type (object); | |
1291 | ||
6874c264 JM |
1292 | if (TYPE_HAS_DESTRUCTOR (TREE_TYPE (object))) |
1293 | { | |
1294 | cleanup = lookup_fnfields (TYPE_BINFO (TREE_TYPE (object)), | |
1295 | dtor_identifier, 0); | |
1296 | cleanup = TREE_VALUE (cleanup); | |
1297 | mark_addressable (cleanup); | |
1298 | /* Pretend it's a normal function. */ | |
1299 | cleanup = build1 (ADDR_EXPR, cleanup_type, cleanup); | |
1300 | } | |
f30432d7 | 1301 | } |
faae18ab | 1302 | |
6874c264 JM |
1303 | if (cleanup == NULL_TREE) |
1304 | { | |
1305 | cleanup = build_int_2 (0, 0); | |
1306 | TREE_TYPE (cleanup) = cleanup_type; | |
1307 | } | |
72b7eeff | 1308 | |
6874c264 JM |
1309 | fn = get_identifier ("__cp_push_exception"); |
1310 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
1311 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
1312 | else | |
1313 | { | |
1314 | /* Declare __cp_push_exception (void*, void*, void (*)(void*, int)), | |
1315 | as defined in exception.cc. */ | |
1316 | tree tmp; | |
1317 | push_obstacks_nochange (); | |
1318 | end_temporary_allocation (); | |
1319 | tmp = tree_cons | |
1320 | (NULL_TREE, ptr_type_node, tree_cons | |
1321 | (NULL_TREE, ptr_type_node, tree_cons | |
1322 | (NULL_TREE, cleanup_type, void_list_node))); | |
1323 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
1324 | build_function_type (void_type_node, tmp)); | |
1325 | DECL_EXTERNAL (fn) = 1; | |
1326 | TREE_PUBLIC (fn) = 1; | |
1327 | DECL_ARTIFICIAL (fn) = 1; | |
1328 | pushdecl_top_level (fn); | |
1329 | make_function_rtl (fn); | |
1330 | assemble_external (fn); | |
1331 | pop_obstacks (); | |
1332 | } | |
72b7eeff | 1333 | |
6874c264 JM |
1334 | /* The throw expression is a full-expression. */ |
1335 | exp = build1 (CLEANUP_POINT_EXPR, TREE_TYPE (exp), exp); | |
1336 | e = expr_tree_cons (NULL_TREE, exp, expr_tree_cons | |
1337 | (NULL_TREE, throw_type, expr_tree_cons | |
1338 | (NULL_TREE, cleanup, NULL_TREE))); | |
1339 | e = build_function_call (fn, e); | |
1340 | expand_expr (e, const0_rtx, VOIDmode, 0); | |
8d2733ca MS |
1341 | } |
1342 | else | |
a3b49ccd | 1343 | { |
6874c264 JM |
1344 | /* rethrow current exception; note that it's no longer caught. */ |
1345 | ||
1346 | tree fn = get_identifier ("__uncatch_exception"); | |
1347 | if (IDENTIFIER_GLOBAL_VALUE (fn)) | |
1348 | fn = IDENTIFIER_GLOBAL_VALUE (fn); | |
1349 | else | |
1350 | { | |
1351 | /* Declare void __uncatch_exception (void) | |
1352 | as defined in exception.cc. */ | |
1353 | push_obstacks_nochange (); | |
1354 | end_temporary_allocation (); | |
1355 | fn = build_lang_decl (FUNCTION_DECL, fn, | |
1356 | build_function_type (void_type_node, | |
1357 | void_list_node)); | |
1358 | DECL_EXTERNAL (fn) = 1; | |
1359 | TREE_PUBLIC (fn) = 1; | |
1360 | DECL_ARTIFICIAL (fn) = 1; | |
1361 | pushdecl_top_level (fn); | |
1362 | make_function_rtl (fn); | |
1363 | assemble_external (fn); | |
1364 | pop_obstacks (); | |
1365 | } | |
1366 | ||
1367 | exp = build_function_call (fn, NULL_TREE); | |
1368 | expand_expr (exp, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
a3b49ccd | 1369 | } |
8d2733ca | 1370 | |
eb66be0e MS |
1371 | if (exceptions_via_longjmp) |
1372 | emit_throw (); | |
1373 | else | |
1374 | { | |
1375 | /* This is the label that represents where in the code we were, when | |
1376 | we got an exception. This needs to be updated when we rethrow an | |
1377 | exception, so that the matching routine knows to search out. */ | |
1378 | label = gen_label_rtx (); | |
1379 | emit_label (label); | |
8d2733ca | 1380 | |
eb66be0e MS |
1381 | expand_internal_throw (label); |
1382 | } | |
f376e137 | 1383 | } |
8d2733ca MS |
1384 | |
1385 | /* Build a throw expression. */ | |
6467930b | 1386 | |
8d2733ca MS |
1387 | tree |
1388 | build_throw (e) | |
1389 | tree e; | |
1390 | { | |
db5ae43f MS |
1391 | if (e != error_mark_node) |
1392 | { | |
5156628f | 1393 | if (processing_template_decl) |
fc378698 | 1394 | return build_min (THROW_EXPR, void_type_node, e); |
db5ae43f MS |
1395 | e = build1 (THROW_EXPR, void_type_node, e); |
1396 | TREE_SIDE_EFFECTS (e) = 1; | |
faae18ab | 1397 | TREE_USED (e) = 1; |
db5ae43f | 1398 | } |
8d2733ca | 1399 | return e; |
8d08fdba | 1400 | } |