]>
Commit | Line | Data |
---|---|---|
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 MS |
25 | #include "config.h" |
26 | #include "tree.h" | |
27 | #include "rtl.h" | |
28 | #include "cp-tree.h" | |
29 | #include "flags.h" | |
8d2733ca MS |
30 | #include "obstack.h" |
31 | #include "expr.h" | |
21451173 | 32 | #include "output.h" |
6467930b MS |
33 | #include "except.h" |
34 | #include "function.h" | |
8d08fdba | 35 | |
f30432d7 | 36 | rtx expand_builtin_return_addr PROTO((enum built_in_function, int, rtx)); |
a3b49ccd | 37 | |
eb66be0e | 38 | /* Holds the fndecl for __builtin_return_address. */ |
8d2733ca | 39 | tree builtin_return_address_fndecl; |
8d2733ca MS |
40 | |
41 | /* A couple of backend routines from m88k.c */ | |
42 | ||
eb66be0e | 43 | /* Used to cache a call to __builtin_return_address. */ |
8d2733ca | 44 | static tree BuiltinReturnAddress; |
f30432d7 | 45 | |
8d2733ca MS |
46 | |
47 | #include <stdio.h> | |
48 | ||
8d2733ca MS |
49 | static void |
50 | easy_expand_asm (str) | |
51 | char *str; | |
52 | { | |
53 | expand_asm (build_string (strlen (str)+1, str)); | |
8d08fdba MS |
54 | } |
55 | ||
8d08fdba | 56 | |
8d2733ca | 57 | #if 0 |
e92cc029 | 58 | /* This is the startup, and finish stuff per exception table. */ |
8d08fdba | 59 | |
8d2733ca MS |
60 | /* XXX - Tad: exception handling section */ |
61 | #ifndef EXCEPT_SECTION_ASM_OP | |
62 | #define EXCEPT_SECTION_ASM_OP "section\t.gcc_except_table,\"a\",@progbits" | |
63 | #endif | |
8d08fdba | 64 | |
8d2733ca MS |
65 | #ifdef EXCEPT_SECTION_ASM_OP |
66 | typedef struct { | |
6467930b MS |
67 | void *start_region; |
68 | void *end_region; | |
8d2733ca MS |
69 | void *exception_handler; |
70 | } exception_table; | |
71 | #endif /* EXCEPT_SECTION_ASM_OP */ | |
8d08fdba | 72 | |
8d2733ca | 73 | #ifdef EXCEPT_SECTION_ASM_OP |
8d08fdba | 74 | |
8d2733ca MS |
75 | /* on machines which support it, the exception table lives in another section, |
76 | but it needs a label so we can reference it... This sets up that | |
77 | label! */ | |
78 | asm (EXCEPT_SECTION_ASM_OP); | |
79 | exception_table __EXCEPTION_TABLE__[1] = { (void*)0, (void*)0, (void*)0 }; | |
80 | asm (TEXT_SECTION_ASM_OP); | |
8d08fdba | 81 | |
8d2733ca | 82 | #endif /* EXCEPT_SECTION_ASM_OP */ |
8d08fdba | 83 | |
8d2733ca MS |
84 | #ifdef EXCEPT_SECTION_ASM_OP |
85 | ||
86 | /* we need to know where the end of the exception table is... so this | |
87 | is how we do it! */ | |
88 | ||
89 | asm (EXCEPT_SECTION_ASM_OP); | |
90 | exception_table __EXCEPTION_END__[1] = { (void*)-1, (void*)-1, (void*)-1 }; | |
91 | asm (TEXT_SECTION_ASM_OP); | |
92 | ||
93 | #endif /* EXCEPT_SECTION_ASM_OP */ | |
94 | ||
95 | #endif | |
8d08fdba | 96 | |
8d2733ca | 97 | #include "decl.h" |
8d2733ca MS |
98 | #include "insn-flags.h" |
99 | #include "obstack.h" | |
8d2733ca MS |
100 | |
101 | /* ====================================================================== | |
102 | Briefly the algorithm works like this: | |
103 | ||
104 | When a constructor or start of a try block is encountered, | |
105 | push_eh_entry (&eh_stack) is called. Push_eh_entry () creates a | |
106 | new entry in the unwind protection stack and returns a label to | |
107 | output to start the protection for that block. | |
108 | ||
109 | When a destructor or end try block is encountered, pop_eh_entry | |
6467930b MS |
110 | (&eh_stack) is called. Pop_eh_entry () returns the eh_entry it |
111 | created when push_eh_entry () was called. The eh_entry structure | |
8d2733ca MS |
112 | contains three things at this point. The start protect label, |
113 | the end protect label, and the exception handler label. The end | |
114 | protect label should be output before the call to the destructor | |
115 | (if any). If it was a destructor, then its parse tree is stored | |
6467930b | 116 | in the finalization variable in the eh_entry structure. Otherwise |
8d2733ca | 117 | the finalization variable is set to NULL to reflect the fact that |
6467930b | 118 | is the the end of a try block. Next, this modified eh_entry node |
8d2733ca MS |
119 | is enqueued in the finalizations queue by calling |
120 | enqueue_eh_entry (&queue,entry). | |
121 | ||
122 | +---------------------------------------------------------------+ | |
123 | |XXX: Will need modification to deal with partially | | |
124 | | constructed arrays of objects | | |
125 | | | | |
126 | | Basically, this consists of keeping track of how many | | |
127 | | of the objects have been constructed already (this | | |
128 | | should be in a register though, so that shouldn't be a | | |
129 | | problem. | | |
130 | +---------------------------------------------------------------+ | |
131 | ||
132 | When a catch block is encountered, there is a lot of work to be | |
133 | done. | |
134 | ||
135 | Since we don't want to generate the catch block inline with the | |
136 | regular flow of the function, we need to have some way of doing | |
f30432d7 MS |
137 | so. Luckily, we can use sequences to defer the catch sections. |
138 | When the start of a catch block is encountered, we start the | |
139 | sequence. After the catch block is generated, we end the | |
140 | sequence. | |
141 | ||
8d2733ca MS |
142 | Next we must insure that when the catch block is executed, all |
143 | finalizations for the matching try block have been completed. If | |
144 | any of those finalizations throw an exception, we must call | |
145 | terminate according to the ARM (section r.15.6.1). What this | |
146 | means is that we need to dequeue and emit finalizations for each | |
6467930b | 147 | entry in the eh_queue until we get to an entry with a NULL |
8d2733ca MS |
148 | finalization field. For any of the finalization entries, if it |
149 | is not a call to terminate (), we must protect it by giving it | |
150 | another start label, end label, and exception handler label, | |
151 | setting its finalization tree to be a call to terminate (), and | |
6467930b | 152 | enqueue'ing this new eh_entry to be output at an outer level. |
8d2733ca MS |
153 | Finally, after all that is done, we can get around to outputting |
154 | the catch block which basically wraps all the "catch (...) {...}" | |
155 | statements in a big if/then/else construct that matches the | |
156 | correct block to call. | |
157 | ||
158 | ===================================================================== */ | |
159 | ||
160 | extern rtx emit_insn PROTO((rtx)); | |
161 | extern rtx gen_nop PROTO(()); | |
8d2733ca MS |
162 | |
163 | /* local globals for function calls | |
164 | ====================================================================== */ | |
165 | ||
eb66be0e MS |
166 | /* Used to cache "terminate", "unexpected", "set_terminate", and |
167 | "set_unexpected" after default_conversion. (lib-except.c) */ | |
6467930b | 168 | static tree Terminate, Unexpected, SetTerminate, SetUnexpected, CatchMatch; |
8d2733ca | 169 | |
eb66be0e | 170 | /* Used to cache __find_first_exception_table_match for throw. */ |
8d2733ca MS |
171 | static tree FirstExceptionMatch; |
172 | ||
eb66be0e | 173 | /* Used to cache a call to __unwind_function. */ |
8d2733ca MS |
174 | static tree Unwind; |
175 | ||
eb66be0e | 176 | /* Holds a ready to emit call to "terminate". */ |
8d2733ca MS |
177 | static tree TerminateFunctionCall; |
178 | ||
72b7eeff MS |
179 | static tree empty_fndecl; |
180 | ||
8d2733ca MS |
181 | /* ====================================================================== */ |
182 | ||
183 | ||
8d2733ca MS |
184 | /* ========================================================================= */ |
185 | ||
186 | ||
187 | ||
188 | /* local globals - these local globals are for storing data necessary for | |
189 | generating the exception table and code in the correct order. | |
190 | ||
191 | ========================================================================= */ | |
192 | ||
a3b49ccd | 193 | /* Holds the pc for doing "throw" */ |
5566b478 | 194 | static tree saved_pc; |
e92cc029 | 195 | /* Holds the type of the thing being thrown. */ |
5566b478 | 196 | static tree saved_throw_type; |
a3b49ccd | 197 | /* Holds the value being thrown. */ |
5566b478 | 198 | static tree saved_throw_value; |
72b7eeff | 199 | /* Holds the cleanup for the value being thrown. */ |
5566b478 | 200 | static tree saved_cleanup; |
a50f0918 MS |
201 | /* Indicates if we are in a catch clause. */ |
202 | static tree saved_in_catch; | |
f30432d7 | 203 | |
6467930b MS |
204 | extern int throw_used; |
205 | extern rtx catch_clauses; | |
8d2733ca | 206 | |
8d2733ca MS |
207 | /* ========================================================================= */ |
208 | ||
6467930b | 209 | /* Cheesyness to save some typing. Returns the return value rtx. */ |
8d2733ca | 210 | |
5566b478 | 211 | static rtx |
f30432d7 MS |
212 | do_function_call (func, params, return_type) |
213 | tree func, params, return_type; | |
214 | { | |
215 | tree func_call; | |
216 | func_call = build_function_call (func, params); | |
217 | expand_call (func_call, NULL_RTX, 0); | |
218 | if (return_type != NULL_TREE) | |
219 | return hard_function_value (return_type, func_call); | |
220 | return NULL_RTX; | |
221 | } | |
222 | ||
8d2733ca MS |
223 | /* ========================================================================= */ |
224 | ||
8d2733ca MS |
225 | /* sets up all the global eh stuff that needs to be initialized at the |
226 | start of compilation. | |
227 | ||
228 | This includes: | |
6467930b | 229 | - Setting up all the function call trees. */ |
8d08fdba | 230 | |
8d08fdba | 231 | void |
8d2733ca | 232 | init_exception_processing () |
8d08fdba | 233 | { |
8d2733ca MS |
234 | extern tree define_function (); |
235 | tree unexpected_fndecl, terminate_fndecl; | |
236 | tree set_unexpected_fndecl, set_terminate_fndecl; | |
237 | tree catch_match_fndecl; | |
238 | tree find_first_exception_match_fndecl; | |
239 | tree unwind_fndecl; | |
f30432d7 MS |
240 | tree declspecs; |
241 | tree d; | |
a3b49ccd | 242 | |
8d2733ca | 243 | /* void (*)() */ |
8ccc31eb MS |
244 | tree PFV = build_pointer_type (build_function_type |
245 | (void_type_node, void_list_node)); | |
8d08fdba | 246 | |
eb66be0e MS |
247 | /* Arg list for the build_function_type call for set_terminate and |
248 | set_unexpected. */ | |
8ccc31eb | 249 | tree pfvlist = tree_cons (NULL_TREE, PFV, void_list_node); |
8d08fdba | 250 | |
8ccc31eb MS |
251 | /* void (*pfvtype (void (*) ()))() */ |
252 | tree pfvtype = build_function_type (PFV, pfvlist); | |
8d2733ca | 253 | |
8ccc31eb MS |
254 | /* void vtype () */ |
255 | tree vtype = build_function_type (void_type_node, void_list_node); | |
256 | ||
257 | set_terminate_fndecl = auto_function (get_identifier ("set_terminate"), | |
258 | pfvtype, NOT_BUILT_IN); | |
259 | set_unexpected_fndecl = auto_function (get_identifier ("set_unexpected"), | |
260 | pfvtype, NOT_BUILT_IN); | |
261 | unexpected_fndecl = auto_function (get_identifier ("unexpected"), | |
262 | vtype, NOT_BUILT_IN); | |
263 | terminate_fndecl = auto_function (get_identifier ("terminate"), | |
264 | vtype, NOT_BUILT_IN); | |
265 | ||
8ccc31eb | 266 | push_lang_context (lang_name_c); |
8d2733ca | 267 | |
beb53fb8 JM |
268 | catch_match_fndecl |
269 | = builtin_function (flag_rtti | |
270 | ? "__throw_type_match_rtti" | |
271 | : "__throw_type_match", | |
272 | build_function_type (ptr_type_node, | |
273 | tree_cons (NULL_TREE, ptr_type_node, | |
274 | tree_cons (NULL_TREE, ptr_type_node, | |
275 | tree_cons (NULL_TREE, ptr_type_node, | |
276 | void_list_node)))), | |
277 | NOT_BUILT_IN, NULL_PTR); | |
278 | find_first_exception_match_fndecl | |
279 | = builtin_function ("__find_first_exception_table_match", | |
280 | build_function_type (ptr_type_node, | |
281 | tree_cons (NULL_TREE, ptr_type_node, | |
282 | void_list_node)), | |
283 | NOT_BUILT_IN, NULL_PTR); | |
284 | unwind_fndecl | |
285 | = builtin_function ("__unwind_function", | |
286 | build_function_type (void_type_node, | |
287 | tree_cons (NULL_TREE, ptr_type_node, | |
288 | void_list_node)), | |
289 | NOT_BUILT_IN, NULL_PTR); | |
290 | empty_fndecl | |
291 | = builtin_function ("__empty", | |
292 | build_function_type (void_type_node, void_list_node), | |
293 | NOT_BUILT_IN, NULL_PTR); | |
72b7eeff MS |
294 | DECL_EXTERNAL (empty_fndecl) = 1; |
295 | TREE_PUBLIC (empty_fndecl) = 1; | |
8d2733ca MS |
296 | |
297 | Unexpected = default_conversion (unexpected_fndecl); | |
298 | Terminate = default_conversion (terminate_fndecl); | |
299 | SetTerminate = default_conversion (set_terminate_fndecl); | |
300 | SetUnexpected = default_conversion (set_unexpected_fndecl); | |
301 | CatchMatch = default_conversion (catch_match_fndecl); | |
302 | FirstExceptionMatch = default_conversion (find_first_exception_match_fndecl); | |
303 | Unwind = default_conversion (unwind_fndecl); | |
304 | BuiltinReturnAddress = default_conversion (builtin_return_address_fndecl); | |
305 | ||
306 | TerminateFunctionCall = build_function_call (Terminate, NULL_TREE); | |
307 | ||
308 | pop_lang_context (); | |
f30432d7 | 309 | |
f30432d7 MS |
310 | declspecs = tree_cons (NULL_TREE, get_identifier ("void"), NULL_TREE); |
311 | d = build_parse_node (INDIRECT_REF, get_identifier ("__eh_pc")); | |
c11b6f21 | 312 | d = start_decl (d, declspecs, 0); |
f30432d7 | 313 | DECL_COMMON (d) = 1; |
9e9ff709 | 314 | cp_finish_decl (d, NULL_TREE, NULL_TREE, 1, 0); |
f30432d7 MS |
315 | saved_pc = lookup_name (get_identifier ("__eh_pc"), 0); |
316 | ||
317 | declspecs = tree_cons (NULL_TREE, get_identifier ("void"), NULL_TREE); | |
318 | d = build_parse_node (INDIRECT_REF, get_identifier ("__eh_type")); | |
c11b6f21 | 319 | d = start_decl (d, declspecs, 0); |
f30432d7 | 320 | DECL_COMMON (d) = 1; |
9e9ff709 | 321 | cp_finish_decl (d, NULL_TREE, NULL_TREE, 1, 0); |
f30432d7 MS |
322 | saved_throw_type = lookup_name (get_identifier ("__eh_type"), 0); |
323 | ||
324 | declspecs = tree_cons (NULL_TREE, get_identifier ("void"), NULL_TREE); | |
325 | d = build_parse_node (INDIRECT_REF, get_identifier ("__eh_value")); | |
c11b6f21 | 326 | d = start_decl (d, declspecs, 0); |
f30432d7 | 327 | DECL_COMMON (d) = 1; |
9e9ff709 | 328 | cp_finish_decl (d, NULL_TREE, NULL_TREE, 1, 0); |
f30432d7 | 329 | saved_throw_value = lookup_name (get_identifier ("__eh_value"), 0); |
72b7eeff MS |
330 | |
331 | declspecs = tree_cons (NULL_TREE, get_identifier ("void"), NULL_TREE); | |
332 | d = build_parse_node (INDIRECT_REF, get_identifier ("__eh_cleanup")); | |
c11b6f21 MS |
333 | d = make_call_declarator (d, void_list_node, NULL_TREE, NULL_TREE); |
334 | d = start_decl (d, declspecs, 0); | |
72b7eeff | 335 | DECL_COMMON (d) = 1; |
9e9ff709 | 336 | cp_finish_decl (d, NULL_TREE, NULL_TREE, 1, 0); |
72b7eeff | 337 | saved_cleanup = lookup_name (get_identifier ("__eh_cleanup"), 0); |
a50f0918 MS |
338 | |
339 | declspecs = tree_cons (NULL_TREE, get_identifier ("bool"), NULL_TREE); | |
340 | d = get_identifier ("__eh_in_catch"); | |
c11b6f21 | 341 | d = start_decl (d, declspecs, 0); |
a50f0918 MS |
342 | DECL_COMMON (d) = 1; |
343 | cp_finish_decl (d, NULL_TREE, NULL_TREE, 1, 0); | |
344 | saved_in_catch = lookup_name (get_identifier ("__eh_in_catch"), 0); | |
eb66be0e MS |
345 | |
346 | /* If we use setjmp/longjmp EH, arrange for all cleanup actions to | |
347 | be protected with __terminate. */ | |
348 | protect_cleanup_actions_with_terminate = 1; | |
8d2733ca MS |
349 | } |
350 | ||
f30432d7 MS |
351 | /* Build a type value for use at runtime for a type that is matched |
352 | against by the exception handling system. */ | |
6467930b | 353 | |
f30432d7 MS |
354 | static tree |
355 | build_eh_type_type (type) | |
356 | tree type; | |
8d08fdba | 357 | { |
f30432d7 MS |
358 | char *typestring; |
359 | tree exp; | |
8d2733ca | 360 | |
f30432d7 MS |
361 | if (type == error_mark_node) |
362 | return error_mark_node; | |
8d2733ca | 363 | |
e92cc029 | 364 | /* peel back references, so they match. */ |
f30432d7 MS |
365 | if (TREE_CODE (type) == REFERENCE_TYPE) |
366 | type = TREE_TYPE (type); | |
8d08fdba | 367 | |
e92cc029 | 368 | /* Peel off cv qualifiers. */ |
f30432d7 | 369 | type = TYPE_MAIN_VARIANT (type); |
8d2733ca | 370 | |
f30432d7 | 371 | if (flag_rtti) |
8d08fdba | 372 | { |
f30432d7 | 373 | return build1 (ADDR_EXPR, ptr_type_node, get_typeid (type)); |
8d08fdba | 374 | } |
f30432d7 MS |
375 | |
376 | typestring = build_overload_name (type, 1, 1); | |
377 | exp = combine_strings (build_string (strlen (typestring)+1, typestring)); | |
378 | return build1 (ADDR_EXPR, ptr_type_node, exp); | |
8d08fdba | 379 | } |
8d08fdba | 380 | |
faae18ab MS |
381 | /* Build a type value for use at runtime for a exp that is thrown or |
382 | matched against by the exception handling system. */ | |
6467930b | 383 | |
faae18ab MS |
384 | static tree |
385 | build_eh_type (exp) | |
386 | tree exp; | |
387 | { | |
faae18ab MS |
388 | if (flag_rtti) |
389 | { | |
390 | exp = build_typeid (exp); | |
391 | return build1 (ADDR_EXPR, ptr_type_node, exp); | |
392 | } | |
f30432d7 | 393 | return build_eh_type_type (TREE_TYPE (exp)); |
faae18ab MS |
394 | } |
395 | ||
72b7eeff | 396 | /* This routine creates the cleanup for the exception handling object. */ |
6467930b | 397 | |
5566b478 | 398 | static void |
72b7eeff MS |
399 | push_eh_cleanup () |
400 | { | |
401 | /* All cleanups must last longer than normal. */ | |
402 | int yes = suspend_momentary (); | |
403 | ||
404 | /* Arrange to do a dynamically scoped cleanup upon exit from this region. */ | |
405 | tree cleanup = build_function_call (saved_cleanup, NULL_TREE); | |
a50f0918 MS |
406 | cleanup = build (COMPOUND_EXPR, void_type_node, cleanup, |
407 | build_modify_expr (saved_in_catch, NOP_EXPR, | |
408 | build_modify_expr (saved_throw_type, NOP_EXPR, integer_zero_node))); | |
e349ee73 | 409 | expand_decl_cleanup (NULL_TREE, cleanup); |
72b7eeff MS |
410 | |
411 | resume_momentary (yes); | |
412 | } | |
413 | ||
414 | ||
8d2733ca MS |
415 | /* call this to start a catch block. Typename is the typename, and identifier |
416 | is the variable to place the object in or NULL if the variable doesn't | |
417 | matter. If typename is NULL, that means its a "catch (...)" or catch | |
418 | everything. In that case we don't need to do any type checking. | |
419 | (ie: it ends up as the "else" clause rather than an "else if" clause) */ | |
6467930b | 420 | |
8d08fdba | 421 | void |
a4443a08 MS |
422 | expand_start_catch_block (declspecs, declarator) |
423 | tree declspecs, declarator; | |
8d08fdba | 424 | { |
8d2733ca | 425 | rtx false_label_rtx; |
faae18ab | 426 | tree decl = NULL_TREE; |
a3b49ccd | 427 | tree init; |
8d2733ca | 428 | |
faf5394a MS |
429 | if (processing_template_decl) |
430 | { | |
431 | if (declspecs) | |
432 | { | |
433 | decl = grokdeclarator (declarator, declspecs, CATCHPARM, | |
434 | 1, NULL_TREE); | |
435 | pushdecl (decl); | |
436 | decl = build_min_nt (DECL_STMT, copy_to_permanent (declarator), | |
437 | copy_to_permanent (declspecs), | |
438 | NULL_TREE); | |
439 | add_tree (decl); | |
440 | } | |
441 | return; | |
442 | } | |
443 | ||
8d2733ca MS |
444 | if (! doing_eh (1)) |
445 | return; | |
446 | ||
a3b49ccd | 447 | /* Create a binding level for the parm. */ |
c11b6f21 | 448 | pushlevel (0); |
a3b49ccd MS |
449 | expand_start_bindings (0); |
450 | ||
f675499c | 451 | false_label_rtx = gen_label_rtx (); |
72b7eeff | 452 | push_label_entry (&false_label_stack, false_label_rtx, NULL_TREE); |
a3b49ccd | 453 | |
eb66be0e MS |
454 | emit_line_note (input_filename, lineno); |
455 | ||
faae18ab | 456 | if (declspecs) |
8d08fdba | 457 | { |
faae18ab | 458 | tree exp; |
8d2733ca | 459 | rtx call_rtx, return_value_rtx; |
faae18ab MS |
460 | tree init_type; |
461 | ||
c11b6f21 | 462 | decl = grokdeclarator (declarator, declspecs, CATCHPARM, 1, NULL_TREE); |
faae18ab MS |
463 | |
464 | if (decl == NULL_TREE) | |
465 | { | |
466 | error ("invalid catch parameter"); | |
6467930b | 467 | |
eb66be0e MS |
468 | /* This is cheap, but we want to maintain the data |
469 | structures. */ | |
470 | ||
6467930b | 471 | expand_eh_region_start (); |
eb66be0e | 472 | |
faae18ab MS |
473 | return; |
474 | } | |
475 | ||
be99da77 MS |
476 | /* Make sure we mark the catch param as used, otherwise we'll get |
477 | a warning about an unused ((anonymous)). */ | |
478 | TREE_USED (decl) = 1; | |
479 | ||
e92cc029 | 480 | /* Figure out the type that the initializer is. */ |
faae18ab | 481 | init_type = TREE_TYPE (decl); |
f30432d7 MS |
482 | if (TREE_CODE (init_type) != REFERENCE_TYPE |
483 | && TREE_CODE (init_type) != POINTER_TYPE) | |
faae18ab MS |
484 | init_type = build_reference_type (init_type); |
485 | ||
f30432d7 | 486 | exp = saved_throw_value; |
faae18ab | 487 | exp = tree_cons (NULL_TREE, |
f30432d7 | 488 | build_eh_type_type (TREE_TYPE (decl)), |
faae18ab | 489 | tree_cons (NULL_TREE, |
f30432d7 | 490 | saved_throw_type, |
faae18ab MS |
491 | tree_cons (NULL_TREE, exp, NULL_TREE))); |
492 | exp = build_function_call (CatchMatch, exp); | |
493 | call_rtx = expand_call (exp, NULL_RTX, 0); | |
e1cd6e56 | 494 | assemble_external (TREE_OPERAND (CatchMatch, 0)); |
8d2733ca | 495 | |
faae18ab | 496 | return_value_rtx = hard_function_value (ptr_type_node, exp); |
8d2733ca MS |
497 | |
498 | /* did the throw type match function return TRUE? */ | |
faae18ab | 499 | emit_cmp_insn (return_value_rtx, const0_rtx, EQ, NULL_RTX, |
8d2733ca MS |
500 | GET_MODE (return_value_rtx), 0, 0); |
501 | ||
502 | /* if it returned FALSE, jump over the catch block, else fall into it */ | |
faae18ab MS |
503 | emit_jump_insn (gen_beq (false_label_rtx)); |
504 | ||
72b7eeff MS |
505 | push_eh_cleanup (); |
506 | ||
faae18ab MS |
507 | init = convert_from_reference (save_expr (make_tree (init_type, call_rtx))); |
508 | ||
509 | /* Do we need the below two lines? */ | |
b3417a04 | 510 | /* Let `cp_finish_decl' know that this initializer is ok. */ |
faae18ab MS |
511 | DECL_INITIAL (decl) = init; |
512 | decl = pushdecl (decl); | |
b3417a04 | 513 | cp_finish_decl (decl, init, NULL_TREE, 0, LOOKUP_ONLYCONVERTING); |
8d08fdba MS |
514 | } |
515 | else | |
516 | { | |
72b7eeff MS |
517 | push_eh_cleanup (); |
518 | ||
e92cc029 | 519 | /* Fall into the catch all section. */ |
8d08fdba | 520 | } |
a3b49ccd | 521 | |
a50f0918 | 522 | emit_move_insn (DECL_RTL (saved_in_catch), const1_rtx); |
f30432d7 | 523 | |
eb66be0e MS |
524 | /* If we are not doing setjmp/longjmp EH, because we are reordered |
525 | out of line, we arrange to rethrow in the outer context so as to | |
526 | skip through the terminate region we are nested in, should we | |
527 | encounter an exception in the catch handler. | |
f30432d7 | 528 | |
eb66be0e MS |
529 | If we are doing setjmp/longjmp EH, we need to skip through the EH |
530 | object cleanup region. This isn't quite right, as we really need | |
531 | to clean the object up, but we cannot do that until we track | |
532 | multiple EH objects. | |
533 | ||
534 | Matches the end in expand_end_catch_block. */ | |
6467930b | 535 | expand_eh_region_start (); |
f30432d7 | 536 | |
6467930b MS |
537 | emit_line_note (input_filename, lineno); |
538 | } | |
f30432d7 | 539 | |
f30432d7 | 540 | |
f30432d7 | 541 | |
8d2733ca MS |
542 | /* Call this to end a catch block. Its responsible for emitting the |
543 | code to handle jumping back to the correct place, and for emitting | |
544 | the label to jump to if this catch block didn't match. */ | |
6467930b | 545 | |
824b9a4c MS |
546 | void |
547 | expand_end_catch_block () | |
8d08fdba | 548 | { |
6467930b MS |
549 | rtx start_region_label_rtx; |
550 | rtx end_region_label_rtx; | |
551 | tree decls, t; | |
a3b49ccd | 552 | |
f30432d7 MS |
553 | if (! doing_eh (1)) |
554 | return; | |
8d2733ca | 555 | |
6467930b MS |
556 | t = make_node (RTL_EXPR); |
557 | TREE_TYPE (t) = void_type_node; | |
558 | RTL_EXPR_RTL (t) = const0_rtx; | |
559 | TREE_SIDE_EFFECTS (t) = 1; | |
560 | start_sequence_for_rtl_expr (t); | |
eb66be0e MS |
561 | |
562 | if (exceptions_via_longjmp) | |
563 | { | |
564 | /* If we are doing setjmp/longjmp EH, we need to skip through | |
565 | the EH object cleanup region. This isn't quite right, as we | |
566 | really need to clean the object up, but we cannot do that | |
567 | until we track multiple EH objects. */ | |
568 | ||
569 | emit_library_call (sjpopnthrow_libfunc, 0, VOIDmode, 0); | |
570 | emit_barrier (); | |
571 | } | |
572 | else | |
573 | { | |
574 | /* If we are not doing setjmp/longjmp EH, we need an extra | |
575 | region around the whole catch block to skip through the | |
576 | terminate region we are nested in. */ | |
577 | ||
578 | expand_internal_throw (DECL_RTL (top_label_entry (&caught_return_label_stack))); | |
579 | } | |
580 | ||
6467930b MS |
581 | RTL_EXPR_SEQUENCE (t) = get_insns (); |
582 | end_sequence (); | |
f30432d7 | 583 | |
eb66be0e | 584 | /* Matches the start in expand_start_catch_block. */ |
6467930b | 585 | expand_eh_region_end (t); |
f30432d7 | 586 | |
eb66be0e MS |
587 | /* Fall to outside the try statement when done executing handler and |
588 | we fall off end of handler. This is jump Lresume in the | |
589 | documentation. */ | |
590 | expand_goto (top_label_entry (&caught_return_label_stack)); | |
591 | ||
6467930b | 592 | expand_leftover_cleanups (); |
f30432d7 MS |
593 | |
594 | /* Cleanup the EH parameter. */ | |
c11b6f21 MS |
595 | expand_end_bindings (getdecls (), kept_level_p (), 0); |
596 | poplevel (kept_level_p (), 1, 0); | |
a3b49ccd | 597 | |
6467930b | 598 | /* label we emit to jump to if this catch block didn't match. */ |
f30432d7 MS |
599 | /* This the closing } in the `if (eq) {' of the documentation. */ |
600 | emit_label (pop_label_entry (&false_label_stack)); | |
8d2733ca | 601 | } |
8d08fdba | 602 | |
6467930b MS |
603 | /* unwind the stack. */ |
604 | ||
db5ae43f | 605 | static void |
f30432d7 MS |
606 | do_unwind (inner_throw_label) |
607 | rtx inner_throw_label; | |
db5ae43f | 608 | { |
be99da77 MS |
609 | #if defined (SPARC_STACK_ALIGN) /* was sparc */ |
610 | /* This doesn't work for the flat model sparc, I bet. */ | |
db5ae43f MS |
611 | tree fcall; |
612 | tree params; | |
613 | rtx return_val_rtx; | |
f30432d7 | 614 | rtx temp; |
db5ae43f | 615 | |
eb66be0e | 616 | /* Call to __builtin_return_address. */ |
f30432d7 | 617 | params = tree_cons (NULL_TREE, integer_zero_node, NULL_TREE); |
db5ae43f | 618 | fcall = build_function_call (BuiltinReturnAddress, params); |
f30432d7 | 619 | return_val_rtx = expand_expr (fcall, NULL_RTX, Pmode, 0); |
ddd5a7c1 | 620 | /* In the return, the new pc is pc+8, as the value coming in is |
db5ae43f | 621 | really the address of the call insn, not the next insn. */ |
f30432d7 MS |
622 | temp = gen_reg_rtx (Pmode); |
623 | emit_move_insn (temp, inner_throw_label); | |
624 | emit_move_insn (return_val_rtx, plus_constant (temp, -8)); | |
d11ad92e | 625 | emit_insn (gen_rtx (USE, VOIDmode, gen_rtx (REG, SImode, 31))); |
db5ae43f MS |
626 | easy_expand_asm ("ret"); |
627 | easy_expand_asm ("restore"); | |
628 | emit_barrier (); | |
629 | #endif | |
be99da77 | 630 | #if defined (ARM_FRAME_RTX) /* was __arm */ |
f30432d7 MS |
631 | if (flag_omit_frame_pointer) |
632 | sorry ("this implementation of exception handling requires a frame pointer"); | |
db5ae43f | 633 | |
f30432d7 MS |
634 | emit_move_insn (stack_pointer_rtx, |
635 | gen_rtx (MEM, Pmode, plus_constant (hard_frame_pointer_rtx, -8))); | |
636 | emit_move_insn (hard_frame_pointer_rtx, | |
637 | gen_rtx (MEM, Pmode, plus_constant (hard_frame_pointer_rtx, -12))); | |
db5ae43f | 638 | #endif |
be99da77 | 639 | #if defined (TARGET_88000) /* was m88k */ |
db5ae43f MS |
640 | rtx temp_frame = frame_pointer_rtx; |
641 | ||
642 | temp_frame = memory_address (Pmode, temp_frame); | |
643 | temp_frame = copy_to_reg (gen_rtx (MEM, Pmode, temp_frame)); | |
644 | ||
645 | /* hopefully this will successfully pop the frame! */ | |
646 | emit_move_insn (frame_pointer_rtx, temp_frame); | |
647 | emit_move_insn (stack_pointer_rtx, frame_pointer_rtx); | |
648 | emit_move_insn (arg_pointer_rtx, frame_pointer_rtx); | |
649 | emit_insn (gen_add2_insn (stack_pointer_rtx, gen_rtx (CONST_INT, VOIDmode, | |
650 | (HOST_WIDE_INT)m88k_debugger_offset (stack_pointer_rtx, 0)))); | |
651 | ||
652 | #if 0 | |
653 | emit_insn (gen_add2_insn (arg_pointer_rtx, gen_rtx (CONST_INT, VOIDmode, | |
654 | -(HOST_WIDE_INT)m88k_debugger_offset (arg_pointer_rtx, 0)))); | |
655 | ||
656 | emit_move_insn (stack_pointer_rtx, arg_pointer_rtx); | |
657 | ||
658 | emit_insn (gen_add2_insn (stack_pointer_rtx, gen_rtx (CONST_INT, VOIDmode, | |
659 | (HOST_WIDE_INT)m88k_debugger_offset (arg_pointer_rtx, 0)))); | |
660 | #endif | |
661 | #endif | |
be99da77 | 662 | #if ! defined (TARGET_88000) && ! defined (ARM_FRAME_RTX) && ! defined (SPARC_STACK_ALIGN) |
f30432d7 MS |
663 | tree fcall; |
664 | tree params; | |
665 | rtx return_val_rtx; | |
e1cd6e56 | 666 | |
be99da77 | 667 | #if 0 |
e92cc029 | 668 | /* I would like to do this here, but the move below doesn't seem to work. */ |
eb66be0e | 669 | /* Call to __builtin_return_address. */ |
f30432d7 MS |
670 | params = tree_cons (NULL_TREE, integer_zero_node, NULL_TREE); |
671 | fcall = build_function_call (BuiltinReturnAddress, params); | |
672 | return_val_rtx = expand_expr (fcall, NULL_RTX, Pmode, 0); | |
be99da77 | 673 | |
f30432d7 | 674 | emit_move_insn (return_val_rtx, inner_throw_label); |
e92cc029 | 675 | /* So, for now, just pass throw label to stack unwinder. */ |
f30432d7 MS |
676 | #endif |
677 | params = tree_cons (NULL_TREE, make_tree (ptr_type_node, | |
678 | inner_throw_label), NULL_TREE); | |
679 | ||
680 | do_function_call (Unwind, params, NULL_TREE); | |
681 | assemble_external (TREE_OPERAND (Unwind, 0)); | |
682 | emit_barrier (); | |
e1cd6e56 | 683 | #endif |
db5ae43f | 684 | } |
8d08fdba | 685 | |
f30432d7 | 686 | |
eb66be0e | 687 | /* Is called from expand_exception_blocks to generate the code in a function |
ddd5a7c1 | 688 | to "throw" if anything in the function needs to perform a throw. |
8d08fdba | 689 | |
ddd5a7c1 | 690 | expands "throw" as the following pseudo code: |
8d2733ca MS |
691 | |
692 | throw: | |
693 | eh = find_first_exception_match (saved_pc); | |
694 | if (!eh) goto gotta_rethrow_it; | |
695 | goto eh; | |
696 | ||
697 | gotta_rethrow_it: | |
698 | saved_pc = __builtin_return_address (0); | |
699 | pop_to_previous_level (); | |
6467930b | 700 | goto throw; */ |
8d2733ca | 701 | |
f30432d7 | 702 | void |
8d2733ca MS |
703 | expand_builtin_throw () |
704 | { | |
705 | tree fcall; | |
706 | tree params; | |
707 | rtx return_val_rtx; | |
f30432d7 MS |
708 | rtx gotta_rethrow_it; |
709 | rtx gotta_call_terminate; | |
f30432d7 MS |
710 | rtx top_of_loop; |
711 | rtx unwind_first; | |
712 | tree t; | |
713 | ||
714 | if (! doing_eh (0)) | |
715 | return; | |
716 | ||
717 | if (! throw_used) | |
718 | return; | |
8d2733ca | 719 | |
f30432d7 | 720 | params = void_list_node; |
c11b6f21 MS |
721 | t = make_call_declarator (get_identifier ("__throw"), params, NULL_TREE, |
722 | NULL_TREE); | |
f30432d7 MS |
723 | start_function (decl_tree_cons (NULL_TREE, get_identifier ("static"), |
724 | void_list_node), | |
c11b6f21 | 725 | t, NULL_TREE, 0); |
f30432d7 MS |
726 | store_parm_decls (); |
727 | pushlevel (0); | |
728 | clear_last_expr (); | |
729 | push_momentary (); | |
730 | expand_start_bindings (0); | |
731 | ||
732 | gotta_rethrow_it = gen_label_rtx (); | |
733 | gotta_call_terminate = gen_label_rtx (); | |
f30432d7 MS |
734 | top_of_loop = gen_label_rtx (); |
735 | unwind_first = gen_label_rtx (); | |
736 | ||
a50f0918 | 737 | /* These two can be frontend specific. If wanted, they can go in |
e92cc029 | 738 | expand_throw. */ |
a50f0918 MS |
739 | /* Do we have a valid object we are throwing? */ |
740 | emit_cmp_insn (DECL_RTL (saved_throw_type), const0_rtx, EQ, NULL_RTX, | |
741 | GET_MODE (DECL_RTL (saved_throw_type)), 0, 0); | |
742 | emit_jump_insn (gen_beq (gotta_call_terminate)); | |
743 | ||
f30432d7 MS |
744 | emit_jump (unwind_first); |
745 | ||
746 | emit_label (top_of_loop); | |
8d2733ca MS |
747 | |
748 | /* search for an exception handler for the saved_pc */ | |
749 | return_val_rtx = do_function_call (FirstExceptionMatch, | |
f30432d7 | 750 | tree_cons (NULL_TREE, saved_pc, NULL_TREE), |
8d2733ca | 751 | ptr_type_node); |
e1cd6e56 | 752 | assemble_external (TREE_OPERAND (FirstExceptionMatch, 0)); |
8d2733ca MS |
753 | |
754 | /* did we find one? */ | |
755 | emit_cmp_insn (return_val_rtx, const0_rtx, EQ, NULL_RTX, | |
756 | GET_MODE (return_val_rtx), 0, 0); | |
757 | ||
758 | /* if not, jump to gotta_rethrow_it */ | |
759 | emit_jump_insn (gen_beq (gotta_rethrow_it)); | |
760 | ||
761 | /* we found it, so jump to it */ | |
762 | emit_indirect_jump (return_val_rtx); | |
763 | ||
764 | /* code to deal with unwinding and looking for it again */ | |
765 | emit_label (gotta_rethrow_it); | |
766 | ||
eb66be0e | 767 | /* Call to __builtin_return_address. */ |
be99da77 MS |
768 | #if defined (ARM_FRAME_RTX) /* was __arm */ |
769 | /* This should be moved into arm.h:RETURN_ADDR_RTX */ | |
770 | /* This replaces a 'call' to __builtin_return_address */ | |
e1cd6e56 | 771 | return_val_rtx = gen_reg_rtx (Pmode); |
f30432d7 | 772 | emit_move_insn (return_val_rtx, gen_rtx (MEM, Pmode, plus_constant (hard_frame_pointer_rtx, -4))); |
e1cd6e56 | 773 | #else |
f30432d7 | 774 | params = tree_cons (NULL_TREE, integer_zero_node, NULL_TREE); |
8d2733ca | 775 | fcall = build_function_call (BuiltinReturnAddress, params); |
f30432d7 | 776 | return_val_rtx = expand_expr (fcall, NULL_RTX, Pmode, 0); |
e1cd6e56 | 777 | #endif |
8d2733ca | 778 | |
eb66be0e | 779 | /* Did __builtin_return_address return a valid address? */ |
8d2733ca MS |
780 | emit_cmp_insn (return_val_rtx, const0_rtx, EQ, NULL_RTX, |
781 | GET_MODE (return_val_rtx), 0, 0); | |
782 | ||
783 | emit_jump_insn (gen_beq (gotta_call_terminate)); | |
784 | ||
be99da77 | 785 | return_val_rtx = eh_outer_context (return_val_rtx); |
e1cd6e56 | 786 | |
be99da77 | 787 | /* Yes it did. */ |
6467930b | 788 | emit_move_insn (eh_saved_pc_rtx, return_val_rtx); |
f30432d7 MS |
789 | |
790 | do_unwind (gen_rtx (LABEL_REF, Pmode, top_of_loop)); | |
791 | emit_jump (top_of_loop); | |
8d2733ca MS |
792 | |
793 | /* no it didn't --> therefore we need to call terminate */ | |
794 | emit_label (gotta_call_terminate); | |
795 | do_function_call (Terminate, NULL_TREE, NULL_TREE); | |
e1cd6e56 | 796 | assemble_external (TREE_OPERAND (Terminate, 0)); |
f30432d7 MS |
797 | |
798 | { | |
799 | rtx ret_val, return_val_rtx; | |
800 | emit_label (unwind_first); | |
801 | ret_val = expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS, | |
802 | 0, hard_frame_pointer_rtx); | |
803 | ||
804 | /* Set it up so that we continue inside, at the top of the loop. */ | |
805 | emit_move_insn (ret_val, gen_rtx (LABEL_REF, Pmode, top_of_loop)); | |
21451173 MS |
806 | #ifdef RETURN_ADDR_OFFSET |
807 | return_val_rtx = plus_constant (ret_val, -RETURN_ADDR_OFFSET); | |
f30432d7 MS |
808 | if (return_val_rtx != ret_val) |
809 | emit_move_insn (ret_val, return_val_rtx); | |
810 | #endif | |
811 | ||
e92cc029 | 812 | /* Fall into epilogue to unwind prologue. */ |
f30432d7 MS |
813 | } |
814 | ||
fc378698 | 815 | expand_end_bindings (getdecls (), 1, 0); |
f30432d7 MS |
816 | poplevel (1, 0, 0); |
817 | pop_momentary (); | |
818 | ||
819 | finish_function (lineno, 0, 0); | |
8d08fdba | 820 | } |
8d2733ca MS |
821 | |
822 | ||
f30432d7 MS |
823 | void |
824 | expand_start_eh_spec () | |
825 | { | |
6467930b | 826 | expand_eh_region_start (); |
f30432d7 MS |
827 | } |
828 | ||
5566b478 | 829 | static void |
f30432d7 MS |
830 | expand_end_eh_spec (raises) |
831 | tree raises; | |
832 | { | |
833 | tree expr, second_try; | |
834 | rtx check = gen_label_rtx (); | |
835 | rtx cont; | |
836 | rtx ret = gen_reg_rtx (Pmode); | |
837 | rtx flag = gen_reg_rtx (TYPE_MODE (integer_type_node)); | |
838 | rtx end = gen_label_rtx (); | |
839 | ||
840 | expr = make_node (RTL_EXPR); | |
841 | TREE_TYPE (expr) = void_type_node; | |
842 | RTL_EXPR_RTL (expr) = const0_rtx; | |
843 | TREE_SIDE_EFFECTS (expr) = 1; | |
844 | start_sequence_for_rtl_expr (expr); | |
845 | cont = gen_label_rtx (); | |
846 | emit_move_insn (ret, gen_rtx (LABEL_REF, Pmode, cont)); | |
847 | emit_jump (check); | |
848 | emit_label (cont); | |
849 | jumpif (make_tree (integer_type_node, flag), end); | |
850 | do_function_call (Terminate, NULL_TREE, NULL_TREE); | |
851 | assemble_external (TREE_OPERAND (Terminate, 0)); | |
852 | emit_barrier (); | |
853 | RTL_EXPR_SEQUENCE (expr) = get_insns (); | |
854 | end_sequence (); | |
855 | ||
856 | second_try = expr; | |
857 | ||
858 | expr = make_node (RTL_EXPR); | |
859 | TREE_TYPE (expr) = void_type_node; | |
860 | RTL_EXPR_RTL (expr) = const0_rtx; | |
861 | TREE_SIDE_EFFECTS (expr) = 1; | |
862 | start_sequence_for_rtl_expr (expr); | |
863 | ||
864 | cont = gen_label_rtx (); | |
865 | emit_move_insn (ret, gen_rtx (LABEL_REF, Pmode, cont)); | |
866 | emit_jump (check); | |
867 | emit_label (cont); | |
868 | jumpif (make_tree (integer_type_node, flag), end); | |
6467930b | 869 | expand_eh_region_start (); |
f30432d7 MS |
870 | do_function_call (Unexpected, NULL_TREE, NULL_TREE); |
871 | assemble_external (TREE_OPERAND (Unexpected, 0)); | |
872 | emit_barrier (); | |
eb66be0e | 873 | |
6467930b | 874 | expand_eh_region_end (second_try); |
f30432d7 MS |
875 | |
876 | emit_label (check); | |
877 | emit_move_insn (flag, const1_rtx); | |
878 | cont = gen_label_rtx (); | |
879 | while (raises) | |
880 | { | |
881 | tree exp; | |
882 | tree match_type = TREE_VALUE (raises); | |
883 | ||
884 | if (match_type) | |
885 | { | |
886 | /* check TREE_VALUE (raises) here */ | |
887 | exp = saved_throw_value; | |
888 | exp = tree_cons (NULL_TREE, | |
889 | build_eh_type_type (match_type), | |
890 | tree_cons (NULL_TREE, | |
891 | saved_throw_type, | |
892 | tree_cons (NULL_TREE, exp, NULL_TREE))); | |
893 | exp = build_function_call (CatchMatch, exp); | |
894 | assemble_external (TREE_OPERAND (CatchMatch, 0)); | |
895 | ||
896 | jumpif (exp, cont); | |
897 | } | |
898 | ||
899 | raises = TREE_CHAIN (raises); | |
900 | } | |
901 | emit_move_insn (flag, const0_rtx); | |
902 | emit_label (cont); | |
903 | emit_indirect_jump (ret); | |
904 | emit_label (end); | |
905 | ||
906 | RTL_EXPR_SEQUENCE (expr) = get_insns (); | |
907 | end_sequence (); | |
908 | ||
6467930b | 909 | expand_eh_region_end (expr); |
f30432d7 MS |
910 | } |
911 | ||
8d2733ca MS |
912 | /* This is called to expand all the toplevel exception handling |
913 | finalization for a function. It should only be called once per | |
914 | function. */ | |
6467930b | 915 | |
8d08fdba | 916 | void |
8d2733ca | 917 | expand_exception_blocks () |
8d08fdba | 918 | { |
21451173 | 919 | rtx funcend; |
eb448459 | 920 | rtx insns; |
f30432d7 MS |
921 | |
922 | start_sequence (); | |
8d2733ca MS |
923 | |
924 | funcend = gen_label_rtx (); | |
8d2733ca | 925 | |
f30432d7 MS |
926 | start_sequence (); |
927 | ||
928 | /* Add all the catch clauses here. */ | |
929 | emit_insns (catch_clauses); | |
930 | catch_clauses = NULL_RTX; | |
8d2733ca MS |
931 | |
932 | expand_leftover_cleanups (); | |
933 | ||
f30432d7 MS |
934 | insns = get_insns (); |
935 | end_sequence (); | |
eb448459 MS |
936 | |
937 | #if 1 | |
938 | /* Do this after we expand leftover cleanups, so that the | |
939 | expand_eh_region_end that expand_end_eh_spec does will match the | |
940 | right expand_eh_region_start, and make sure it comes out before | |
941 | the terminate protected region. */ | |
f30432d7 MS |
942 | if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl))) |
943 | { | |
eb448459 MS |
944 | expand_end_eh_spec (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl))); |
945 | push_to_sequence (insns); | |
f30432d7 | 946 | |
eb448459 MS |
947 | /* Now expand any new ones. */ |
948 | expand_leftover_cleanups (); | |
f30432d7 | 949 | |
eb448459 MS |
950 | insns = get_insns (); |
951 | end_sequence (); | |
f30432d7 | 952 | } |
eb448459 MS |
953 | #endif |
954 | ||
955 | emit_jump (funcend); | |
f30432d7 MS |
956 | |
957 | if (insns) | |
958 | { | |
eb66be0e MS |
959 | /* We cannot protect n regions this way if we must flow into the |
960 | EH region through the top of the region, as we have to with | |
961 | the setjmp/longjmp approach. */ | |
962 | if (exceptions_via_longjmp == 0) | |
963 | { | |
964 | /* Is this necessary? */ | |
965 | assemble_external (TREE_OPERAND (Terminate, 0)); | |
966 | ||
967 | expand_eh_region_start (); | |
968 | } | |
f30432d7 | 969 | |
f30432d7 | 970 | emit_insns (insns); |
eb66be0e MS |
971 | |
972 | if (exceptions_via_longjmp == 0) | |
973 | expand_eh_region_end (TerminateFunctionCall); | |
974 | ||
6467930b | 975 | expand_leftover_cleanups (); |
f30432d7 MS |
976 | } |
977 | ||
8d2733ca | 978 | emit_label (funcend); |
f30432d7 MS |
979 | |
980 | /* Only if we had previous insns do we want to emit the jump around | |
981 | them. If there weren't any, then insns will remain NULL_RTX. */ | |
982 | if (insns) | |
983 | insns = get_insns (); | |
984 | end_sequence (); | |
985 | ||
eb448459 | 986 | emit_insns (insns); |
8d08fdba MS |
987 | } |
988 | ||
72b7eeff MS |
989 | tree |
990 | start_anon_func () | |
991 | { | |
992 | static int counter = 0; | |
e92cc029 | 993 | int old_interface_unknown = interface_unknown; |
72b7eeff MS |
994 | char name[32]; |
995 | tree params; | |
996 | tree t; | |
997 | ||
998 | push_cp_function_context (NULL_TREE); | |
999 | push_to_top_level (); | |
1000 | ||
1001 | /* No need to mangle this. */ | |
1002 | push_lang_context (lang_name_c); | |
1003 | ||
e92cc029 MS |
1004 | interface_unknown = 1; |
1005 | ||
72b7eeff MS |
1006 | params = void_list_node; |
1007 | /* tcf stands for throw clean funciton. */ | |
1008 | sprintf (name, "__tcf_%d", counter++); | |
c11b6f21 MS |
1009 | t = make_call_declarator (get_identifier (name), params, NULL_TREE, |
1010 | NULL_TREE); | |
72b7eeff MS |
1011 | start_function (decl_tree_cons (NULL_TREE, get_identifier ("static"), |
1012 | void_list_node), | |
c11b6f21 | 1013 | t, NULL_TREE, 0); |
72b7eeff MS |
1014 | store_parm_decls (); |
1015 | pushlevel (0); | |
1016 | clear_last_expr (); | |
1017 | push_momentary (); | |
1018 | expand_start_bindings (0); | |
1019 | emit_line_note (input_filename, lineno); | |
1020 | ||
e92cc029 MS |
1021 | interface_unknown = old_interface_unknown; |
1022 | ||
72b7eeff MS |
1023 | pop_lang_context (); |
1024 | ||
1025 | return current_function_decl; | |
1026 | } | |
1027 | ||
1028 | void | |
1029 | end_anon_func () | |
1030 | { | |
fc378698 | 1031 | expand_end_bindings (getdecls (), 1, 0); |
72b7eeff MS |
1032 | poplevel (1, 0, 0); |
1033 | pop_momentary (); | |
1034 | ||
1035 | finish_function (lineno, 0, 0); | |
1036 | ||
1037 | pop_from_top_level (); | |
1038 | pop_cp_function_context (NULL_TREE); | |
1039 | } | |
8d2733ca | 1040 | |
6467930b | 1041 | /* Expand a throw statement. This follows the following |
8d2733ca MS |
1042 | algorithm: |
1043 | ||
1044 | 1. Allocate space to save the current PC onto the stack. | |
1045 | 2. Generate and emit a label and save its address into the | |
e1cd6e56 | 1046 | newly allocated stack space since we can't save the pc directly. |
8d2733ca MS |
1047 | 3. If this is the first call to throw in this function: |
1048 | generate a label for the throw block | |
1049 | 4. jump to the throw block label. */ | |
6467930b | 1050 | |
8d08fdba | 1051 | void |
8d2733ca MS |
1052 | expand_throw (exp) |
1053 | tree exp; | |
8d08fdba | 1054 | { |
8d2733ca | 1055 | rtx label; |
8d08fdba | 1056 | |
8d2733ca MS |
1057 | if (! doing_eh (1)) |
1058 | return; | |
8d08fdba | 1059 | |
8d2733ca MS |
1060 | if (exp) |
1061 | { | |
faae18ab | 1062 | tree throw_type; |
72b7eeff | 1063 | tree cleanup = empty_fndecl, e; |
faae18ab | 1064 | |
a3b49ccd | 1065 | /* throw expression */ |
e92cc029 | 1066 | /* First, decay it. */ |
f30432d7 | 1067 | exp = decay_conversion (exp); |
a3b49ccd | 1068 | |
f30432d7 MS |
1069 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) |
1070 | { | |
1071 | throw_type = build_eh_type (exp); | |
1072 | exp = build_reinterpret_cast (ptr_type_node, exp); | |
1073 | } | |
1074 | else | |
1075 | { | |
72b7eeff | 1076 | tree object; |
a50f0918 | 1077 | |
f30432d7 MS |
1078 | /* Make a copy of the thrown object. WP 15.1.5 */ |
1079 | exp = build_new (NULL_TREE, TREE_TYPE (exp), | |
1080 | build_tree_list (NULL_TREE, exp), | |
1081 | 0); | |
faae18ab | 1082 | |
f30432d7 MS |
1083 | if (exp == error_mark_node) |
1084 | error (" in thrown expression"); | |
faae18ab | 1085 | |
72b7eeff MS |
1086 | object = build_indirect_ref (exp, NULL_PTR); |
1087 | throw_type = build_eh_type (object); | |
1088 | ||
1089 | start_sequence (); | |
1090 | object = build_reinterpret_cast (TREE_TYPE (exp), saved_throw_value); | |
1091 | object = build_indirect_ref (object, NULL_PTR); | |
c73964b2 | 1092 | cleanup = maybe_build_cleanup_and_delete (object); |
72b7eeff MS |
1093 | end_sequence (); |
1094 | ||
824b9a4c | 1095 | if (cleanup) |
72b7eeff MS |
1096 | { |
1097 | cleanup = start_anon_func (); | |
1098 | ||
c73964b2 MS |
1099 | expand_expr (maybe_build_cleanup_and_delete (object), |
1100 | const0_rtx, VOIDmode, 0); | |
72b7eeff MS |
1101 | |
1102 | end_anon_func (); | |
1103 | ||
1104 | mark_addressable (cleanup); | |
1105 | } | |
1106 | else | |
1107 | { | |
1108 | cleanup = empty_fndecl; | |
1109 | } | |
f30432d7 | 1110 | } |
faae18ab | 1111 | |
be99da77 MS |
1112 | if (cleanup == empty_fndecl) |
1113 | assemble_external (empty_fndecl); | |
1114 | ||
f30432d7 MS |
1115 | e = build_modify_expr (saved_throw_type, NOP_EXPR, throw_type); |
1116 | expand_expr (e, const0_rtx, VOIDmode, 0); | |
72b7eeff | 1117 | |
f30432d7 MS |
1118 | e = build_modify_expr (saved_throw_value, NOP_EXPR, exp); |
1119 | e = build1 (CLEANUP_POINT_EXPR, TREE_TYPE (e), e); | |
1120 | expand_expr (e, const0_rtx, VOIDmode, 0); | |
72b7eeff MS |
1121 | |
1122 | cleanup = build_unary_op (ADDR_EXPR, cleanup, 0); | |
1123 | cleanup = build_modify_expr (saved_cleanup, NOP_EXPR, cleanup); | |
1124 | expand_expr (cleanup, const0_rtx, VOIDmode, 0); | |
8d2733ca MS |
1125 | } |
1126 | else | |
a3b49ccd MS |
1127 | { |
1128 | /* rethrow current exception */ | |
8ccc31eb | 1129 | /* This part is easy, as we don't have to do anything else. */ |
a3b49ccd | 1130 | } |
8d2733ca | 1131 | |
eb66be0e MS |
1132 | if (exceptions_via_longjmp) |
1133 | emit_throw (); | |
1134 | else | |
1135 | { | |
1136 | /* This is the label that represents where in the code we were, when | |
1137 | we got an exception. This needs to be updated when we rethrow an | |
1138 | exception, so that the matching routine knows to search out. */ | |
1139 | label = gen_label_rtx (); | |
1140 | emit_label (label); | |
8d2733ca | 1141 | |
eb66be0e MS |
1142 | expand_internal_throw (label); |
1143 | } | |
f376e137 | 1144 | } |
8d2733ca MS |
1145 | |
1146 | /* Build a throw expression. */ | |
6467930b | 1147 | |
8d2733ca MS |
1148 | tree |
1149 | build_throw (e) | |
1150 | tree e; | |
1151 | { | |
db5ae43f MS |
1152 | if (e != error_mark_node) |
1153 | { | |
5156628f | 1154 | if (processing_template_decl) |
fc378698 | 1155 | return build_min (THROW_EXPR, void_type_node, e); |
db5ae43f MS |
1156 | e = build1 (THROW_EXPR, void_type_node, e); |
1157 | TREE_SIDE_EFFECTS (e) = 1; | |
faae18ab | 1158 | TREE_USED (e) = 1; |
db5ae43f | 1159 | } |
8d2733ca | 1160 | return e; |
8d08fdba | 1161 | } |