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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" | |
8d08fdba | 36 | |
f30432d7 | 37 | rtx expand_builtin_return_addr PROTO((enum built_in_function, int, rtx)); |
a3b49ccd | 38 | |
eb66be0e | 39 | /* Holds the fndecl for __builtin_return_address. */ |
8d2733ca | 40 | tree builtin_return_address_fndecl; |
8d2733ca MS |
41 | |
42 | /* A couple of backend routines from m88k.c */ | |
43 | ||
eb66be0e | 44 | /* Used to cache a call to __builtin_return_address. */ |
8d2733ca | 45 | static tree BuiltinReturnAddress; |
f30432d7 | 46 | |
8d2733ca | 47 | |
8d2733ca MS |
48 | static void |
49 | easy_expand_asm (str) | |
50 | char *str; | |
51 | { | |
52 | expand_asm (build_string (strlen (str)+1, str)); | |
8d08fdba MS |
53 | } |
54 | ||
8d08fdba | 55 | |
8d2733ca | 56 | #if 0 |
e92cc029 | 57 | /* This is the startup, and finish stuff per exception table. */ |
8d08fdba | 58 | |
8d2733ca MS |
59 | /* XXX - Tad: exception handling section */ |
60 | #ifndef EXCEPT_SECTION_ASM_OP | |
61 | #define EXCEPT_SECTION_ASM_OP "section\t.gcc_except_table,\"a\",@progbits" | |
62 | #endif | |
8d08fdba | 63 | |
8d2733ca MS |
64 | #ifdef EXCEPT_SECTION_ASM_OP |
65 | typedef struct { | |
6467930b MS |
66 | void *start_region; |
67 | void *end_region; | |
8d2733ca MS |
68 | void *exception_handler; |
69 | } exception_table; | |
70 | #endif /* EXCEPT_SECTION_ASM_OP */ | |
8d08fdba | 71 | |
8d2733ca | 72 | #ifdef EXCEPT_SECTION_ASM_OP |
8d08fdba | 73 | |
8d2733ca MS |
74 | /* on machines which support it, the exception table lives in another section, |
75 | but it needs a label so we can reference it... This sets up that | |
76 | label! */ | |
77 | asm (EXCEPT_SECTION_ASM_OP); | |
78 | exception_table __EXCEPTION_TABLE__[1] = { (void*)0, (void*)0, (void*)0 }; | |
79 | asm (TEXT_SECTION_ASM_OP); | |
8d08fdba | 80 | |
8d2733ca | 81 | #endif /* EXCEPT_SECTION_ASM_OP */ |
8d08fdba | 82 | |
8d2733ca MS |
83 | #ifdef EXCEPT_SECTION_ASM_OP |
84 | ||
85 | /* we need to know where the end of the exception table is... so this | |
86 | is how we do it! */ | |
87 | ||
88 | asm (EXCEPT_SECTION_ASM_OP); | |
89 | exception_table __EXCEPTION_END__[1] = { (void*)-1, (void*)-1, (void*)-1 }; | |
90 | asm (TEXT_SECTION_ASM_OP); | |
91 | ||
92 | #endif /* EXCEPT_SECTION_ASM_OP */ | |
93 | ||
94 | #endif | |
8d08fdba | 95 | |
8d2733ca | 96 | #include "decl.h" |
8d2733ca MS |
97 | #include "insn-flags.h" |
98 | #include "obstack.h" | |
8d2733ca MS |
99 | |
100 | /* ====================================================================== | |
101 | Briefly the algorithm works like this: | |
102 | ||
103 | When a constructor or start of a try block is encountered, | |
104 | push_eh_entry (&eh_stack) is called. Push_eh_entry () creates a | |
105 | new entry in the unwind protection stack and returns a label to | |
106 | output to start the protection for that block. | |
107 | ||
108 | When a destructor or end try block is encountered, pop_eh_entry | |
6467930b MS |
109 | (&eh_stack) is called. Pop_eh_entry () returns the eh_entry it |
110 | created when push_eh_entry () was called. The eh_entry structure | |
8d2733ca MS |
111 | contains three things at this point. The start protect label, |
112 | the end protect label, and the exception handler label. The end | |
113 | protect label should be output before the call to the destructor | |
114 | (if any). If it was a destructor, then its parse tree is stored | |
6467930b | 115 | in the finalization variable in the eh_entry structure. Otherwise |
8d2733ca | 116 | the finalization variable is set to NULL to reflect the fact that |
6467930b | 117 | is the the end of a try block. Next, this modified eh_entry node |
8d2733ca MS |
118 | is enqueued in the finalizations queue by calling |
119 | enqueue_eh_entry (&queue,entry). | |
120 | ||
121 | +---------------------------------------------------------------+ | |
122 | |XXX: Will need modification to deal with partially | | |
123 | | constructed arrays of objects | | |
124 | | | | |
125 | | Basically, this consists of keeping track of how many | | |
126 | | of the objects have been constructed already (this | | |
127 | | should be in a register though, so that shouldn't be a | | |
128 | | problem. | | |
129 | +---------------------------------------------------------------+ | |
130 | ||
131 | When a catch block is encountered, there is a lot of work to be | |
132 | done. | |
133 | ||
134 | Since we don't want to generate the catch block inline with the | |
135 | regular flow of the function, we need to have some way of doing | |
f30432d7 MS |
136 | so. Luckily, we can use sequences to defer the catch sections. |
137 | When the start of a catch block is encountered, we start the | |
138 | sequence. After the catch block is generated, we end the | |
139 | sequence. | |
140 | ||
8d2733ca MS |
141 | Next we must insure that when the catch block is executed, all |
142 | finalizations for the matching try block have been completed. If | |
143 | any of those finalizations throw an exception, we must call | |
144 | terminate according to the ARM (section r.15.6.1). What this | |
145 | means is that we need to dequeue and emit finalizations for each | |
6467930b | 146 | entry in the eh_queue until we get to an entry with a NULL |
8d2733ca MS |
147 | finalization field. For any of the finalization entries, if it |
148 | is not a call to terminate (), we must protect it by giving it | |
149 | another start label, end label, and exception handler label, | |
150 | setting its finalization tree to be a call to terminate (), and | |
6467930b | 151 | enqueue'ing this new eh_entry to be output at an outer level. |
8d2733ca MS |
152 | Finally, after all that is done, we can get around to outputting |
153 | the catch block which basically wraps all the "catch (...) {...}" | |
154 | statements in a big if/then/else construct that matches the | |
155 | correct block to call. | |
156 | ||
157 | ===================================================================== */ | |
158 | ||
159 | extern rtx emit_insn PROTO((rtx)); | |
160 | extern rtx gen_nop PROTO(()); | |
8d2733ca MS |
161 | |
162 | /* local globals for function calls | |
163 | ====================================================================== */ | |
164 | ||
eb66be0e MS |
165 | /* Used to cache "terminate", "unexpected", "set_terminate", and |
166 | "set_unexpected" after default_conversion. (lib-except.c) */ | |
6467930b | 167 | static tree Terminate, Unexpected, SetTerminate, SetUnexpected, CatchMatch; |
8d2733ca | 168 | |
eb66be0e | 169 | /* Used to cache __find_first_exception_table_match for throw. */ |
8d2733ca MS |
170 | static tree FirstExceptionMatch; |
171 | ||
eb66be0e | 172 | /* Used to cache a call to __unwind_function. */ |
8d2733ca MS |
173 | static tree Unwind; |
174 | ||
eb66be0e | 175 | /* Holds a ready to emit call to "terminate". */ |
8d2733ca MS |
176 | static tree TerminateFunctionCall; |
177 | ||
72b7eeff MS |
178 | static tree empty_fndecl; |
179 | ||
8d2733ca MS |
180 | /* ====================================================================== */ |
181 | ||
182 | ||
8d2733ca MS |
183 | /* ========================================================================= */ |
184 | ||
185 | ||
186 | ||
187 | /* local globals - these local globals are for storing data necessary for | |
188 | generating the exception table and code in the correct order. | |
189 | ||
190 | ========================================================================= */ | |
191 | ||
a3b49ccd | 192 | /* Holds the pc for doing "throw" */ |
5566b478 | 193 | static tree saved_pc; |
e92cc029 | 194 | /* Holds the type of the thing being thrown. */ |
5566b478 | 195 | static tree saved_throw_type; |
a3b49ccd | 196 | /* Holds the value being thrown. */ |
5566b478 | 197 | static tree saved_throw_value; |
72b7eeff | 198 | /* Holds the cleanup for the value being thrown. */ |
5566b478 | 199 | static tree saved_cleanup; |
a50f0918 MS |
200 | /* Indicates if we are in a catch clause. */ |
201 | static tree saved_in_catch; | |
f30432d7 | 202 | |
6467930b MS |
203 | extern int throw_used; |
204 | extern rtx catch_clauses; | |
8d2733ca | 205 | |
8d2733ca MS |
206 | /* ========================================================================= */ |
207 | ||
6467930b | 208 | /* Cheesyness to save some typing. Returns the return value rtx. */ |
8d2733ca | 209 | |
5566b478 | 210 | static rtx |
f30432d7 MS |
211 | do_function_call (func, params, return_type) |
212 | tree func, params, return_type; | |
213 | { | |
214 | tree func_call; | |
215 | func_call = build_function_call (func, params); | |
216 | expand_call (func_call, NULL_RTX, 0); | |
217 | if (return_type != NULL_TREE) | |
218 | return hard_function_value (return_type, func_call); | |
219 | return NULL_RTX; | |
220 | } | |
221 | ||
8d2733ca MS |
222 | /* ========================================================================= */ |
223 | ||
8d2733ca MS |
224 | /* sets up all the global eh stuff that needs to be initialized at the |
225 | start of compilation. | |
226 | ||
227 | This includes: | |
6467930b | 228 | - Setting up all the function call trees. */ |
8d08fdba | 229 | |
8d08fdba | 230 | void |
8d2733ca | 231 | init_exception_processing () |
8d08fdba | 232 | { |
8d2733ca MS |
233 | extern tree define_function (); |
234 | tree unexpected_fndecl, terminate_fndecl; | |
235 | tree set_unexpected_fndecl, set_terminate_fndecl; | |
236 | tree catch_match_fndecl; | |
237 | tree find_first_exception_match_fndecl; | |
238 | tree unwind_fndecl; | |
f30432d7 MS |
239 | tree declspecs; |
240 | tree d; | |
a3b49ccd | 241 | |
6633d636 MS |
242 | /* void vtype () */ |
243 | tree vtype = build_function_type (void_type_node, void_list_node); | |
244 | ||
8d2733ca | 245 | /* void (*)() */ |
6633d636 | 246 | tree PFV = build_pointer_type (vtype); |
8d08fdba | 247 | |
eb66be0e MS |
248 | /* Arg list for the build_function_type call for set_terminate and |
249 | set_unexpected. */ | |
8ccc31eb | 250 | tree pfvlist = tree_cons (NULL_TREE, PFV, void_list_node); |
8d08fdba | 251 | |
8ccc31eb MS |
252 | /* void (*pfvtype (void (*) ()))() */ |
253 | tree pfvtype = build_function_type (PFV, pfvlist); | |
8d2733ca | 254 | |
8ccc31eb MS |
255 | set_terminate_fndecl = auto_function (get_identifier ("set_terminate"), |
256 | pfvtype, NOT_BUILT_IN); | |
257 | set_unexpected_fndecl = auto_function (get_identifier ("set_unexpected"), | |
258 | pfvtype, NOT_BUILT_IN); | |
259 | unexpected_fndecl = auto_function (get_identifier ("unexpected"), | |
260 | vtype, NOT_BUILT_IN); | |
261 | terminate_fndecl = auto_function (get_identifier ("terminate"), | |
262 | vtype, NOT_BUILT_IN); | |
e00737d2 | 263 | TREE_THIS_VOLATILE (terminate_fndecl) = 1; |
8ccc31eb | 264 | |
8ccc31eb | 265 | push_lang_context (lang_name_c); |
8d2733ca | 266 | |
beb53fb8 JM |
267 | catch_match_fndecl |
268 | = builtin_function (flag_rtti | |
269 | ? "__throw_type_match_rtti" | |
270 | : "__throw_type_match", | |
271 | build_function_type (ptr_type_node, | |
272 | tree_cons (NULL_TREE, ptr_type_node, | |
273 | tree_cons (NULL_TREE, ptr_type_node, | |
274 | tree_cons (NULL_TREE, ptr_type_node, | |
275 | void_list_node)))), | |
276 | NOT_BUILT_IN, NULL_PTR); | |
277 | find_first_exception_match_fndecl | |
278 | = builtin_function ("__find_first_exception_table_match", | |
279 | build_function_type (ptr_type_node, | |
280 | tree_cons (NULL_TREE, ptr_type_node, | |
281 | void_list_node)), | |
282 | NOT_BUILT_IN, NULL_PTR); | |
283 | unwind_fndecl | |
284 | = builtin_function ("__unwind_function", | |
285 | build_function_type (void_type_node, | |
286 | tree_cons (NULL_TREE, ptr_type_node, | |
287 | void_list_node)), | |
288 | NOT_BUILT_IN, NULL_PTR); | |
289 | empty_fndecl | |
290 | = builtin_function ("__empty", | |
6633d636 | 291 | vtype, |
beb53fb8 | 292 | NOT_BUILT_IN, NULL_PTR); |
72b7eeff MS |
293 | DECL_EXTERNAL (empty_fndecl) = 1; |
294 | TREE_PUBLIC (empty_fndecl) = 1; | |
8d2733ca MS |
295 | |
296 | Unexpected = default_conversion (unexpected_fndecl); | |
297 | Terminate = default_conversion (terminate_fndecl); | |
298 | SetTerminate = default_conversion (set_terminate_fndecl); | |
299 | SetUnexpected = default_conversion (set_unexpected_fndecl); | |
300 | CatchMatch = default_conversion (catch_match_fndecl); | |
301 | FirstExceptionMatch = default_conversion (find_first_exception_match_fndecl); | |
302 | Unwind = default_conversion (unwind_fndecl); | |
303 | BuiltinReturnAddress = default_conversion (builtin_return_address_fndecl); | |
304 | ||
305 | TerminateFunctionCall = build_function_call (Terminate, NULL_TREE); | |
306 | ||
307 | pop_lang_context (); | |
f30432d7 | 308 | |
f30432d7 MS |
309 | declspecs = tree_cons (NULL_TREE, get_identifier ("void"), NULL_TREE); |
310 | d = build_parse_node (INDIRECT_REF, get_identifier ("__eh_pc")); | |
c11b6f21 | 311 | d = start_decl (d, declspecs, 0); |
f30432d7 | 312 | DECL_COMMON (d) = 1; |
9e9ff709 | 313 | cp_finish_decl (d, NULL_TREE, NULL_TREE, 1, 0); |
f30432d7 MS |
314 | saved_pc = lookup_name (get_identifier ("__eh_pc"), 0); |
315 | ||
316 | declspecs = tree_cons (NULL_TREE, get_identifier ("void"), NULL_TREE); | |
317 | d = build_parse_node (INDIRECT_REF, get_identifier ("__eh_type")); | |
c11b6f21 | 318 | d = start_decl (d, declspecs, 0); |
f30432d7 | 319 | DECL_COMMON (d) = 1; |
9e9ff709 | 320 | cp_finish_decl (d, NULL_TREE, NULL_TREE, 1, 0); |
f30432d7 MS |
321 | saved_throw_type = lookup_name (get_identifier ("__eh_type"), 0); |
322 | ||
323 | declspecs = tree_cons (NULL_TREE, get_identifier ("void"), NULL_TREE); | |
324 | d = build_parse_node (INDIRECT_REF, get_identifier ("__eh_value")); | |
c11b6f21 | 325 | d = start_decl (d, declspecs, 0); |
f30432d7 | 326 | DECL_COMMON (d) = 1; |
9e9ff709 | 327 | cp_finish_decl (d, NULL_TREE, NULL_TREE, 1, 0); |
f30432d7 | 328 | saved_throw_value = lookup_name (get_identifier ("__eh_value"), 0); |
72b7eeff MS |
329 | |
330 | declspecs = tree_cons (NULL_TREE, get_identifier ("void"), NULL_TREE); | |
331 | d = build_parse_node (INDIRECT_REF, get_identifier ("__eh_cleanup")); | |
c11b6f21 MS |
332 | d = make_call_declarator (d, void_list_node, NULL_TREE, NULL_TREE); |
333 | d = start_decl (d, declspecs, 0); | |
72b7eeff | 334 | DECL_COMMON (d) = 1; |
9e9ff709 | 335 | cp_finish_decl (d, NULL_TREE, NULL_TREE, 1, 0); |
72b7eeff | 336 | saved_cleanup = lookup_name (get_identifier ("__eh_cleanup"), 0); |
a50f0918 MS |
337 | |
338 | declspecs = tree_cons (NULL_TREE, get_identifier ("bool"), NULL_TREE); | |
339 | d = get_identifier ("__eh_in_catch"); | |
c11b6f21 | 340 | d = start_decl (d, declspecs, 0); |
a50f0918 MS |
341 | DECL_COMMON (d) = 1; |
342 | cp_finish_decl (d, NULL_TREE, NULL_TREE, 1, 0); | |
343 | saved_in_catch = lookup_name (get_identifier ("__eh_in_catch"), 0); | |
eb66be0e MS |
344 | |
345 | /* If we use setjmp/longjmp EH, arrange for all cleanup actions to | |
346 | be protected with __terminate. */ | |
347 | protect_cleanup_actions_with_terminate = 1; | |
8d2733ca MS |
348 | } |
349 | ||
f30432d7 MS |
350 | /* Build a type value for use at runtime for a type that is matched |
351 | against by the exception handling system. */ | |
6467930b | 352 | |
f30432d7 MS |
353 | static tree |
354 | build_eh_type_type (type) | |
355 | tree type; | |
8d08fdba | 356 | { |
f30432d7 MS |
357 | char *typestring; |
358 | tree exp; | |
8d2733ca | 359 | |
f30432d7 MS |
360 | if (type == error_mark_node) |
361 | return error_mark_node; | |
8d2733ca | 362 | |
e92cc029 | 363 | /* peel back references, so they match. */ |
f30432d7 MS |
364 | if (TREE_CODE (type) == REFERENCE_TYPE) |
365 | type = TREE_TYPE (type); | |
8d08fdba | 366 | |
e92cc029 | 367 | /* Peel off cv qualifiers. */ |
f30432d7 | 368 | type = TYPE_MAIN_VARIANT (type); |
8d2733ca | 369 | |
f30432d7 | 370 | if (flag_rtti) |
8d08fdba | 371 | { |
f30432d7 | 372 | return build1 (ADDR_EXPR, ptr_type_node, get_typeid (type)); |
8d08fdba | 373 | } |
f30432d7 MS |
374 | |
375 | typestring = build_overload_name (type, 1, 1); | |
376 | exp = combine_strings (build_string (strlen (typestring)+1, typestring)); | |
377 | return build1 (ADDR_EXPR, ptr_type_node, exp); | |
8d08fdba | 378 | } |
8d08fdba | 379 | |
faae18ab MS |
380 | /* Build a type value for use at runtime for a exp that is thrown or |
381 | matched against by the exception handling system. */ | |
6467930b | 382 | |
faae18ab MS |
383 | static tree |
384 | build_eh_type (exp) | |
385 | tree exp; | |
386 | { | |
faae18ab MS |
387 | if (flag_rtti) |
388 | { | |
389 | exp = build_typeid (exp); | |
390 | return build1 (ADDR_EXPR, ptr_type_node, exp); | |
391 | } | |
f30432d7 | 392 | return build_eh_type_type (TREE_TYPE (exp)); |
faae18ab MS |
393 | } |
394 | ||
72b7eeff | 395 | /* This routine creates the cleanup for the exception handling object. */ |
6467930b | 396 | |
5566b478 | 397 | static void |
72b7eeff MS |
398 | push_eh_cleanup () |
399 | { | |
400 | /* All cleanups must last longer than normal. */ | |
401 | int yes = suspend_momentary (); | |
402 | ||
403 | /* Arrange to do a dynamically scoped cleanup upon exit from this region. */ | |
404 | tree cleanup = build_function_call (saved_cleanup, NULL_TREE); | |
a50f0918 MS |
405 | cleanup = build (COMPOUND_EXPR, void_type_node, cleanup, |
406 | build_modify_expr (saved_in_catch, NOP_EXPR, | |
407 | build_modify_expr (saved_throw_type, NOP_EXPR, integer_zero_node))); | |
e349ee73 | 408 | expand_decl_cleanup (NULL_TREE, cleanup); |
72b7eeff MS |
409 | |
410 | resume_momentary (yes); | |
411 | } | |
412 | ||
413 | ||
8d2733ca MS |
414 | /* call this to start a catch block. Typename is the typename, and identifier |
415 | is the variable to place the object in or NULL if the variable doesn't | |
416 | matter. If typename is NULL, that means its a "catch (...)" or catch | |
417 | everything. In that case we don't need to do any type checking. | |
418 | (ie: it ends up as the "else" clause rather than an "else if" clause) */ | |
6467930b | 419 | |
8d08fdba | 420 | void |
a4443a08 MS |
421 | expand_start_catch_block (declspecs, declarator) |
422 | tree declspecs, declarator; | |
8d08fdba | 423 | { |
8d2733ca | 424 | rtx false_label_rtx; |
faae18ab | 425 | tree decl = NULL_TREE; |
a3b49ccd | 426 | tree init; |
8d2733ca | 427 | |
faf5394a MS |
428 | if (processing_template_decl) |
429 | { | |
430 | if (declspecs) | |
431 | { | |
432 | decl = grokdeclarator (declarator, declspecs, CATCHPARM, | |
433 | 1, NULL_TREE); | |
434 | pushdecl (decl); | |
435 | decl = build_min_nt (DECL_STMT, copy_to_permanent (declarator), | |
436 | copy_to_permanent (declspecs), | |
437 | NULL_TREE); | |
438 | add_tree (decl); | |
439 | } | |
440 | return; | |
441 | } | |
442 | ||
8d2733ca MS |
443 | if (! doing_eh (1)) |
444 | return; | |
445 | ||
a3b49ccd | 446 | /* Create a binding level for the parm. */ |
c11b6f21 | 447 | pushlevel (0); |
a3b49ccd MS |
448 | expand_start_bindings (0); |
449 | ||
f675499c | 450 | false_label_rtx = gen_label_rtx (); |
72b7eeff | 451 | push_label_entry (&false_label_stack, false_label_rtx, NULL_TREE); |
a3b49ccd | 452 | |
eb66be0e MS |
453 | emit_line_note (input_filename, lineno); |
454 | ||
faae18ab | 455 | if (declspecs) |
8d08fdba | 456 | { |
faae18ab | 457 | tree exp; |
8d2733ca | 458 | rtx call_rtx, return_value_rtx; |
faae18ab MS |
459 | tree init_type; |
460 | ||
c11b6f21 | 461 | decl = grokdeclarator (declarator, declspecs, CATCHPARM, 1, NULL_TREE); |
faae18ab MS |
462 | |
463 | if (decl == NULL_TREE) | |
464 | { | |
465 | error ("invalid catch parameter"); | |
6467930b | 466 | |
eb66be0e MS |
467 | /* This is cheap, but we want to maintain the data |
468 | structures. */ | |
469 | ||
6467930b | 470 | expand_eh_region_start (); |
eb66be0e | 471 | |
faae18ab MS |
472 | return; |
473 | } | |
474 | ||
be99da77 MS |
475 | /* Make sure we mark the catch param as used, otherwise we'll get |
476 | a warning about an unused ((anonymous)). */ | |
477 | TREE_USED (decl) = 1; | |
478 | ||
e92cc029 | 479 | /* Figure out the type that the initializer is. */ |
faae18ab | 480 | init_type = TREE_TYPE (decl); |
f30432d7 MS |
481 | if (TREE_CODE (init_type) != REFERENCE_TYPE |
482 | && TREE_CODE (init_type) != POINTER_TYPE) | |
faae18ab MS |
483 | init_type = build_reference_type (init_type); |
484 | ||
f30432d7 | 485 | exp = saved_throw_value; |
faae18ab | 486 | exp = tree_cons (NULL_TREE, |
f30432d7 | 487 | build_eh_type_type (TREE_TYPE (decl)), |
faae18ab | 488 | tree_cons (NULL_TREE, |
f30432d7 | 489 | saved_throw_type, |
faae18ab MS |
490 | tree_cons (NULL_TREE, exp, NULL_TREE))); |
491 | exp = build_function_call (CatchMatch, exp); | |
492 | call_rtx = expand_call (exp, NULL_RTX, 0); | |
e1cd6e56 | 493 | assemble_external (TREE_OPERAND (CatchMatch, 0)); |
8d2733ca | 494 | |
faae18ab | 495 | return_value_rtx = hard_function_value (ptr_type_node, exp); |
8d2733ca MS |
496 | |
497 | /* did the throw type match function return TRUE? */ | |
faae18ab | 498 | emit_cmp_insn (return_value_rtx, const0_rtx, EQ, NULL_RTX, |
8d2733ca MS |
499 | GET_MODE (return_value_rtx), 0, 0); |
500 | ||
501 | /* if it returned FALSE, jump over the catch block, else fall into it */ | |
faae18ab MS |
502 | emit_jump_insn (gen_beq (false_label_rtx)); |
503 | ||
72b7eeff MS |
504 | push_eh_cleanup (); |
505 | ||
faae18ab MS |
506 | init = convert_from_reference (save_expr (make_tree (init_type, call_rtx))); |
507 | ||
508 | /* Do we need the below two lines? */ | |
b3417a04 | 509 | /* Let `cp_finish_decl' know that this initializer is ok. */ |
faae18ab MS |
510 | DECL_INITIAL (decl) = init; |
511 | decl = pushdecl (decl); | |
b3417a04 | 512 | cp_finish_decl (decl, init, NULL_TREE, 0, LOOKUP_ONLYCONVERTING); |
8d08fdba MS |
513 | } |
514 | else | |
515 | { | |
72b7eeff MS |
516 | push_eh_cleanup (); |
517 | ||
e92cc029 | 518 | /* Fall into the catch all section. */ |
8d08fdba | 519 | } |
a3b49ccd | 520 | |
a50f0918 | 521 | emit_move_insn (DECL_RTL (saved_in_catch), const1_rtx); |
f30432d7 | 522 | |
eb66be0e MS |
523 | /* If we are not doing setjmp/longjmp EH, because we are reordered |
524 | out of line, we arrange to rethrow in the outer context so as to | |
525 | skip through the terminate region we are nested in, should we | |
526 | encounter an exception in the catch handler. | |
f30432d7 | 527 | |
eb66be0e MS |
528 | If we are doing setjmp/longjmp EH, we need to skip through the EH |
529 | object cleanup region. This isn't quite right, as we really need | |
530 | to clean the object up, but we cannot do that until we track | |
531 | multiple EH objects. | |
532 | ||
533 | Matches the end in expand_end_catch_block. */ | |
6467930b | 534 | expand_eh_region_start (); |
f30432d7 | 535 | |
6467930b MS |
536 | emit_line_note (input_filename, lineno); |
537 | } | |
f30432d7 | 538 | |
f30432d7 | 539 | |
f30432d7 | 540 | |
8d2733ca MS |
541 | /* Call this to end a catch block. Its responsible for emitting the |
542 | code to handle jumping back to the correct place, and for emitting | |
543 | the label to jump to if this catch block didn't match. */ | |
6467930b | 544 | |
824b9a4c MS |
545 | void |
546 | expand_end_catch_block () | |
8d08fdba | 547 | { |
6467930b MS |
548 | rtx start_region_label_rtx; |
549 | rtx end_region_label_rtx; | |
550 | tree decls, t; | |
a3b49ccd | 551 | |
f30432d7 MS |
552 | if (! doing_eh (1)) |
553 | return; | |
8d2733ca | 554 | |
6467930b MS |
555 | t = make_node (RTL_EXPR); |
556 | TREE_TYPE (t) = void_type_node; | |
557 | RTL_EXPR_RTL (t) = const0_rtx; | |
558 | TREE_SIDE_EFFECTS (t) = 1; | |
559 | start_sequence_for_rtl_expr (t); | |
eb66be0e MS |
560 | |
561 | if (exceptions_via_longjmp) | |
562 | { | |
563 | /* If we are doing setjmp/longjmp EH, we need to skip through | |
564 | the EH object cleanup region. This isn't quite right, as we | |
565 | really need to clean the object up, but we cannot do that | |
566 | until we track multiple EH objects. */ | |
567 | ||
568 | emit_library_call (sjpopnthrow_libfunc, 0, VOIDmode, 0); | |
569 | emit_barrier (); | |
570 | } | |
571 | else | |
572 | { | |
573 | /* If we are not doing setjmp/longjmp EH, we need an extra | |
574 | region around the whole catch block to skip through the | |
575 | terminate region we are nested in. */ | |
576 | ||
577 | expand_internal_throw (DECL_RTL (top_label_entry (&caught_return_label_stack))); | |
578 | } | |
579 | ||
6467930b MS |
580 | RTL_EXPR_SEQUENCE (t) = get_insns (); |
581 | end_sequence (); | |
f30432d7 | 582 | |
eb66be0e | 583 | /* Matches the start in expand_start_catch_block. */ |
6467930b | 584 | expand_eh_region_end (t); |
f30432d7 | 585 | |
eb66be0e MS |
586 | /* Fall to outside the try statement when done executing handler and |
587 | we fall off end of handler. This is jump Lresume in the | |
588 | documentation. */ | |
589 | expand_goto (top_label_entry (&caught_return_label_stack)); | |
590 | ||
6467930b | 591 | expand_leftover_cleanups (); |
f30432d7 MS |
592 | |
593 | /* Cleanup the EH parameter. */ | |
c11b6f21 MS |
594 | expand_end_bindings (getdecls (), kept_level_p (), 0); |
595 | poplevel (kept_level_p (), 1, 0); | |
a3b49ccd | 596 | |
6467930b | 597 | /* label we emit to jump to if this catch block didn't match. */ |
f30432d7 MS |
598 | /* This the closing } in the `if (eq) {' of the documentation. */ |
599 | emit_label (pop_label_entry (&false_label_stack)); | |
8d2733ca | 600 | } |
8d08fdba | 601 | |
6467930b MS |
602 | /* unwind the stack. */ |
603 | ||
db5ae43f | 604 | static void |
f30432d7 MS |
605 | do_unwind (inner_throw_label) |
606 | rtx inner_throw_label; | |
db5ae43f | 607 | { |
be99da77 MS |
608 | #if defined (SPARC_STACK_ALIGN) /* was sparc */ |
609 | /* This doesn't work for the flat model sparc, I bet. */ | |
db5ae43f MS |
610 | tree fcall; |
611 | tree params; | |
6633d636 | 612 | rtx next_pc; |
f30432d7 | 613 | rtx temp; |
db5ae43f | 614 | |
eb66be0e | 615 | /* Call to __builtin_return_address. */ |
f30432d7 | 616 | params = tree_cons (NULL_TREE, integer_zero_node, NULL_TREE); |
db5ae43f | 617 | fcall = build_function_call (BuiltinReturnAddress, params); |
6633d636 | 618 | next_pc = expand_expr (fcall, NULL_RTX, Pmode, 0); |
ddd5a7c1 | 619 | /* In the return, the new pc is pc+8, as the value coming in is |
db5ae43f | 620 | really the address of the call insn, not the next insn. */ |
f30432d7 MS |
621 | temp = gen_reg_rtx (Pmode); |
622 | emit_move_insn (temp, inner_throw_label); | |
6633d636 | 623 | emit_move_insn (next_pc, plus_constant (temp, -8)); |
d11ad92e | 624 | emit_insn (gen_rtx (USE, VOIDmode, gen_rtx (REG, SImode, 31))); |
db5ae43f MS |
625 | easy_expand_asm ("ret"); |
626 | easy_expand_asm ("restore"); | |
627 | emit_barrier (); | |
628 | #endif | |
be99da77 | 629 | #if defined (ARM_FRAME_RTX) /* was __arm */ |
f30432d7 MS |
630 | if (flag_omit_frame_pointer) |
631 | sorry ("this implementation of exception handling requires a frame pointer"); | |
db5ae43f | 632 | |
f30432d7 MS |
633 | emit_move_insn (stack_pointer_rtx, |
634 | gen_rtx (MEM, Pmode, plus_constant (hard_frame_pointer_rtx, -8))); | |
635 | emit_move_insn (hard_frame_pointer_rtx, | |
636 | gen_rtx (MEM, Pmode, plus_constant (hard_frame_pointer_rtx, -12))); | |
db5ae43f | 637 | #endif |
be99da77 | 638 | #if defined (TARGET_88000) /* was m88k */ |
db5ae43f MS |
639 | rtx temp_frame = frame_pointer_rtx; |
640 | ||
641 | temp_frame = memory_address (Pmode, temp_frame); | |
642 | temp_frame = copy_to_reg (gen_rtx (MEM, Pmode, temp_frame)); | |
643 | ||
644 | /* hopefully this will successfully pop the frame! */ | |
645 | emit_move_insn (frame_pointer_rtx, temp_frame); | |
646 | emit_move_insn (stack_pointer_rtx, frame_pointer_rtx); | |
647 | emit_move_insn (arg_pointer_rtx, frame_pointer_rtx); | |
648 | emit_insn (gen_add2_insn (stack_pointer_rtx, gen_rtx (CONST_INT, VOIDmode, | |
649 | (HOST_WIDE_INT)m88k_debugger_offset (stack_pointer_rtx, 0)))); | |
650 | ||
651 | #if 0 | |
652 | emit_insn (gen_add2_insn (arg_pointer_rtx, gen_rtx (CONST_INT, VOIDmode, | |
653 | -(HOST_WIDE_INT)m88k_debugger_offset (arg_pointer_rtx, 0)))); | |
654 | ||
655 | emit_move_insn (stack_pointer_rtx, arg_pointer_rtx); | |
656 | ||
657 | emit_insn (gen_add2_insn (stack_pointer_rtx, gen_rtx (CONST_INT, VOIDmode, | |
658 | (HOST_WIDE_INT)m88k_debugger_offset (arg_pointer_rtx, 0)))); | |
659 | #endif | |
660 | #endif | |
be99da77 | 661 | #if ! defined (TARGET_88000) && ! defined (ARM_FRAME_RTX) && ! defined (SPARC_STACK_ALIGN) |
f30432d7 MS |
662 | tree fcall; |
663 | tree params; | |
6633d636 | 664 | rtx next_pc; |
e1cd6e56 | 665 | |
be99da77 | 666 | #if 0 |
e92cc029 | 667 | /* I would like to do this here, but the move below doesn't seem to work. */ |
eb66be0e | 668 | /* Call to __builtin_return_address. */ |
f30432d7 MS |
669 | params = tree_cons (NULL_TREE, integer_zero_node, NULL_TREE); |
670 | fcall = build_function_call (BuiltinReturnAddress, params); | |
6633d636 | 671 | next_pc = expand_expr (fcall, NULL_RTX, Pmode, 0); |
be99da77 | 672 | |
6633d636 | 673 | emit_move_insn (next_pc, inner_throw_label); |
e92cc029 | 674 | /* So, for now, just pass throw label to stack unwinder. */ |
f30432d7 MS |
675 | #endif |
676 | params = tree_cons (NULL_TREE, make_tree (ptr_type_node, | |
677 | inner_throw_label), NULL_TREE); | |
678 | ||
679 | do_function_call (Unwind, params, NULL_TREE); | |
680 | assemble_external (TREE_OPERAND (Unwind, 0)); | |
681 | emit_barrier (); | |
e1cd6e56 | 682 | #endif |
db5ae43f | 683 | } |
8d08fdba | 684 | |
f30432d7 | 685 | |
eb66be0e | 686 | /* Is called from expand_exception_blocks to generate the code in a function |
ddd5a7c1 | 687 | to "throw" if anything in the function needs to perform a throw. |
8d08fdba | 688 | |
ddd5a7c1 | 689 | expands "throw" as the following pseudo code: |
8d2733ca MS |
690 | |
691 | throw: | |
692 | eh = find_first_exception_match (saved_pc); | |
693 | if (!eh) goto gotta_rethrow_it; | |
694 | goto eh; | |
695 | ||
696 | gotta_rethrow_it: | |
697 | saved_pc = __builtin_return_address (0); | |
698 | pop_to_previous_level (); | |
6467930b | 699 | goto throw; */ |
8d2733ca | 700 | |
f30432d7 | 701 | void |
8d2733ca MS |
702 | expand_builtin_throw () |
703 | { | |
704 | tree fcall; | |
705 | tree params; | |
6633d636 MS |
706 | rtx handler; |
707 | rtx saved_pcnthrow; | |
708 | rtx next_pc; | |
f30432d7 MS |
709 | rtx gotta_rethrow_it; |
710 | rtx gotta_call_terminate; | |
6633d636 | 711 | rtx after_unwind; |
f30432d7 | 712 | rtx top_of_loop; |
f30432d7 | 713 | tree t; |
6633d636 | 714 | rtx x; |
f30432d7 MS |
715 | |
716 | if (! doing_eh (0)) | |
717 | return; | |
718 | ||
719 | if (! throw_used) | |
720 | return; | |
8d2733ca | 721 | |
f30432d7 | 722 | params = void_list_node; |
c11b6f21 MS |
723 | t = make_call_declarator (get_identifier ("__throw"), params, NULL_TREE, |
724 | NULL_TREE); | |
6633d636 MS |
725 | start_function (decl_tree_cons (NULL_TREE, |
726 | get_identifier ("void"), | |
727 | decl_tree_cons (NULL_TREE, | |
728 | get_identifier ("static"), | |
729 | NULL_TREE)), | |
c11b6f21 | 730 | t, NULL_TREE, 0); |
f30432d7 MS |
731 | store_parm_decls (); |
732 | pushlevel (0); | |
733 | clear_last_expr (); | |
734 | push_momentary (); | |
735 | expand_start_bindings (0); | |
736 | ||
737 | gotta_rethrow_it = gen_label_rtx (); | |
738 | gotta_call_terminate = gen_label_rtx (); | |
f30432d7 | 739 | |
a50f0918 | 740 | /* These two can be frontend specific. If wanted, they can go in |
e92cc029 | 741 | expand_throw. */ |
a50f0918 MS |
742 | /* Do we have a valid object we are throwing? */ |
743 | emit_cmp_insn (DECL_RTL (saved_throw_type), const0_rtx, EQ, NULL_RTX, | |
744 | GET_MODE (DECL_RTL (saved_throw_type)), 0, 0); | |
745 | emit_jump_insn (gen_beq (gotta_call_terminate)); | |
746 | ||
8d2733ca | 747 | /* search for an exception handler for the saved_pc */ |
6633d636 MS |
748 | handler = do_function_call (FirstExceptionMatch, |
749 | tree_cons (NULL_TREE, saved_pc, | |
750 | NULL_TREE), | |
751 | ptr_type_node); | |
e1cd6e56 | 752 | assemble_external (TREE_OPERAND (FirstExceptionMatch, 0)); |
8d2733ca MS |
753 | |
754 | /* did we find one? */ | |
6633d636 MS |
755 | emit_cmp_insn (handler, const0_rtx, EQ, NULL_RTX, |
756 | GET_MODE (handler), 0, 0); | |
8d2733ca MS |
757 | |
758 | /* if not, jump to gotta_rethrow_it */ | |
759 | emit_jump_insn (gen_beq (gotta_rethrow_it)); | |
760 | ||
6633d636 MS |
761 | { |
762 | rtx ret_val, x; | |
763 | ret_val = expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS, | |
764 | 0, hard_frame_pointer_rtx); | |
8d2733ca | 765 | |
6633d636 MS |
766 | /* Set it up so that we continue at the handler. */ |
767 | emit_move_insn (ret_val, handler); | |
768 | #ifdef RETURN_ADDR_OFFSET | |
769 | x = plus_constant (ret_val, -RETURN_ADDR_OFFSET); | |
770 | if (x != ret_val) | |
771 | emit_move_insn (ret_val, x); | |
772 | #endif | |
8d2733ca | 773 | |
6633d636 MS |
774 | expand_null_return (); |
775 | } | |
776 | ||
777 | top_of_loop = gen_label_rtx (); | |
778 | emit_label (top_of_loop); | |
779 | ||
780 | #ifdef DONT_ACCESS_GBLS_AFTER_EPILOGUE | |
781 | if (DONT_ACCESS_GBLS_AFTER_EPILOGUE) | |
782 | { | |
783 | saved_pcnthrow = gen_reg_rtx (Pmode); | |
784 | emit_move_insn (saved_pcnthrow, hard_function_value (ptr_type_node, | |
785 | NULL_TREE)); | |
786 | } | |
787 | #endif | |
788 | ||
eb66be0e | 789 | /* Call to __builtin_return_address. */ |
be99da77 MS |
790 | #if defined (ARM_FRAME_RTX) /* was __arm */ |
791 | /* This should be moved into arm.h:RETURN_ADDR_RTX */ | |
792 | /* This replaces a 'call' to __builtin_return_address */ | |
6633d636 MS |
793 | next_pc = gen_reg_rtx (Pmode); |
794 | emit_move_insn (next_pc, | |
795 | gen_rtx (MEM, Pmode, plus_constant (hard_frame_pointer_rtx, -4))); | |
e1cd6e56 | 796 | #else |
f30432d7 | 797 | params = tree_cons (NULL_TREE, integer_zero_node, NULL_TREE); |
8d2733ca | 798 | fcall = build_function_call (BuiltinReturnAddress, params); |
6633d636 | 799 | next_pc = expand_expr (fcall, NULL_RTX, Pmode, 0); |
e1cd6e56 | 800 | #endif |
8d2733ca | 801 | |
eb66be0e | 802 | /* Did __builtin_return_address return a valid address? */ |
6633d636 MS |
803 | emit_cmp_insn (next_pc, const0_rtx, EQ, NULL_RTX, |
804 | GET_MODE (next_pc), 0, 0); | |
8d2733ca MS |
805 | |
806 | emit_jump_insn (gen_beq (gotta_call_terminate)); | |
807 | ||
6633d636 | 808 | next_pc = eh_outer_context (next_pc); |
e1cd6e56 | 809 | |
be99da77 | 810 | /* Yes it did. */ |
6633d636 MS |
811 | #ifdef DONT_ACCESS_GBLS_AFTER_EPILOGUE |
812 | if (DONT_ACCESS_GBLS_AFTER_EPILOGUE) | |
813 | { | |
814 | rtx x; | |
815 | ||
816 | x = validize_mem (gen_rtx (MEM, Pmode, saved_pcnthrow)); | |
817 | emit_move_insn (validize_mem (gen_rtx (MEM, Pmode, x)), | |
818 | next_pc); | |
819 | #ifdef FUNCTION_OUTGOING_VALUE | |
820 | emit_move_insn (FUNCTION_OUTGOING_VALUE (ptr_type_node, NULL_TREE), | |
821 | validize_mem (gen_rtx (MEM, Pmode, | |
822 | plus_constant (saved_pcnthrow, | |
823 | GET_MODE_SIZE (Pmode))))); | |
824 | emit_insn (gen_rtx (USE, VOIDmode, | |
825 | FUNCTION_OUTGOING_VALUE (ptr_type_node, NULL_TREE))); | |
826 | #endif | |
827 | } | |
828 | else | |
829 | #endif | |
830 | emit_move_insn (eh_saved_pc_rtx, next_pc); | |
f30432d7 | 831 | |
6633d636 MS |
832 | after_unwind = gen_label_rtx (); |
833 | do_unwind (gen_rtx (LABEL_REF, Pmode, after_unwind)); | |
834 | ||
835 | emit_label (after_unwind); | |
836 | ||
837 | #ifdef DONT_ACCESS_GBLS_AFTER_EPILOGUE | |
838 | if (DONT_ACCESS_GBLS_AFTER_EPILOGUE) | |
839 | { | |
840 | t = make_tree (build_pointer_type (TREE_TYPE (empty_fndecl)), | |
841 | hard_function_value (ptr_type_node, | |
842 | NULL_TREE)); | |
843 | t = build_function_call (t, NULL_TREE); | |
844 | expand_expr (t, const0_rtx, VOIDmode, 0); | |
845 | } | |
846 | else | |
847 | #endif | |
848 | emit_throw (); | |
8d2733ca MS |
849 | |
850 | /* no it didn't --> therefore we need to call terminate */ | |
851 | emit_label (gotta_call_terminate); | |
852 | do_function_call (Terminate, NULL_TREE, NULL_TREE); | |
e1cd6e56 | 853 | assemble_external (TREE_OPERAND (Terminate, 0)); |
f30432d7 MS |
854 | |
855 | { | |
6633d636 MS |
856 | rtx ret_val, x; |
857 | /* code to deal with unwinding and looking for it again */ | |
858 | emit_label (gotta_rethrow_it); | |
f30432d7 MS |
859 | ret_val = expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS, |
860 | 0, hard_frame_pointer_rtx); | |
861 | ||
862 | /* Set it up so that we continue inside, at the top of the loop. */ | |
863 | emit_move_insn (ret_val, gen_rtx (LABEL_REF, Pmode, top_of_loop)); | |
21451173 | 864 | #ifdef RETURN_ADDR_OFFSET |
6633d636 MS |
865 | x = plus_constant (ret_val, -RETURN_ADDR_OFFSET); |
866 | if (x != ret_val) | |
867 | emit_move_insn (ret_val, x); | |
868 | #endif | |
869 | ||
870 | #ifdef DONT_ACCESS_GBLS_AFTER_EPILOGUE | |
871 | if (DONT_ACCESS_GBLS_AFTER_EPILOGUE) | |
872 | { | |
873 | rtx x = emit_library_call_value (gen_rtx (SYMBOL_REF, Pmode, | |
874 | "__eh_pcnthrow"), | |
875 | NULL_RTX, 1, | |
876 | Pmode, 0); | |
877 | /* This is to get a version of throw that will throw properly. */ | |
878 | emit_move_insn (validize_mem (gen_rtx (MEM, Pmode, | |
879 | plus_constant (x, GET_MODE_SIZE (Pmode)))), | |
880 | throw_libfunc); | |
881 | #ifdef FUNCTION_OUTGOING_VALUE | |
882 | emit_move_insn (FUNCTION_OUTGOING_VALUE (ptr_type_node, NULL_TREE), | |
883 | x); | |
884 | emit_insn (gen_rtx (USE, VOIDmode, FUNCTION_OUTGOING_VALUE (ptr_type_node, NULL_TREE))); | |
885 | #endif | |
886 | } | |
f30432d7 MS |
887 | #endif |
888 | ||
e92cc029 | 889 | /* Fall into epilogue to unwind prologue. */ |
f30432d7 MS |
890 | } |
891 | ||
fc378698 | 892 | expand_end_bindings (getdecls (), 1, 0); |
f30432d7 MS |
893 | poplevel (1, 0, 0); |
894 | pop_momentary (); | |
895 | ||
896 | finish_function (lineno, 0, 0); | |
8d08fdba | 897 | } |
8d2733ca MS |
898 | |
899 | ||
f30432d7 MS |
900 | void |
901 | expand_start_eh_spec () | |
902 | { | |
6467930b | 903 | expand_eh_region_start (); |
f30432d7 MS |
904 | } |
905 | ||
5566b478 | 906 | static void |
f30432d7 MS |
907 | expand_end_eh_spec (raises) |
908 | tree raises; | |
909 | { | |
910 | tree expr, second_try; | |
911 | rtx check = gen_label_rtx (); | |
912 | rtx cont; | |
913 | rtx ret = gen_reg_rtx (Pmode); | |
914 | rtx flag = gen_reg_rtx (TYPE_MODE (integer_type_node)); | |
915 | rtx end = gen_label_rtx (); | |
916 | ||
917 | expr = make_node (RTL_EXPR); | |
918 | TREE_TYPE (expr) = void_type_node; | |
919 | RTL_EXPR_RTL (expr) = const0_rtx; | |
920 | TREE_SIDE_EFFECTS (expr) = 1; | |
921 | start_sequence_for_rtl_expr (expr); | |
922 | cont = gen_label_rtx (); | |
923 | emit_move_insn (ret, gen_rtx (LABEL_REF, Pmode, cont)); | |
924 | emit_jump (check); | |
925 | emit_label (cont); | |
926 | jumpif (make_tree (integer_type_node, flag), end); | |
927 | do_function_call (Terminate, NULL_TREE, NULL_TREE); | |
928 | assemble_external (TREE_OPERAND (Terminate, 0)); | |
929 | emit_barrier (); | |
930 | RTL_EXPR_SEQUENCE (expr) = get_insns (); | |
931 | end_sequence (); | |
932 | ||
933 | second_try = expr; | |
934 | ||
935 | expr = make_node (RTL_EXPR); | |
936 | TREE_TYPE (expr) = void_type_node; | |
937 | RTL_EXPR_RTL (expr) = const0_rtx; | |
938 | TREE_SIDE_EFFECTS (expr) = 1; | |
939 | start_sequence_for_rtl_expr (expr); | |
940 | ||
941 | cont = gen_label_rtx (); | |
942 | emit_move_insn (ret, gen_rtx (LABEL_REF, Pmode, cont)); | |
943 | emit_jump (check); | |
944 | emit_label (cont); | |
945 | jumpif (make_tree (integer_type_node, flag), end); | |
6467930b | 946 | expand_eh_region_start (); |
f30432d7 MS |
947 | do_function_call (Unexpected, NULL_TREE, NULL_TREE); |
948 | assemble_external (TREE_OPERAND (Unexpected, 0)); | |
949 | emit_barrier (); | |
eb66be0e | 950 | |
6467930b | 951 | expand_eh_region_end (second_try); |
f30432d7 MS |
952 | |
953 | emit_label (check); | |
954 | emit_move_insn (flag, const1_rtx); | |
955 | cont = gen_label_rtx (); | |
956 | while (raises) | |
957 | { | |
958 | tree exp; | |
959 | tree match_type = TREE_VALUE (raises); | |
960 | ||
961 | if (match_type) | |
962 | { | |
963 | /* check TREE_VALUE (raises) here */ | |
964 | exp = saved_throw_value; | |
965 | exp = tree_cons (NULL_TREE, | |
966 | build_eh_type_type (match_type), | |
967 | tree_cons (NULL_TREE, | |
968 | saved_throw_type, | |
969 | tree_cons (NULL_TREE, exp, NULL_TREE))); | |
970 | exp = build_function_call (CatchMatch, exp); | |
971 | assemble_external (TREE_OPERAND (CatchMatch, 0)); | |
972 | ||
973 | jumpif (exp, cont); | |
974 | } | |
975 | ||
976 | raises = TREE_CHAIN (raises); | |
977 | } | |
978 | emit_move_insn (flag, const0_rtx); | |
979 | emit_label (cont); | |
980 | emit_indirect_jump (ret); | |
981 | emit_label (end); | |
982 | ||
983 | RTL_EXPR_SEQUENCE (expr) = get_insns (); | |
984 | end_sequence (); | |
985 | ||
6467930b | 986 | expand_eh_region_end (expr); |
f30432d7 MS |
987 | } |
988 | ||
8d2733ca MS |
989 | /* This is called to expand all the toplevel exception handling |
990 | finalization for a function. It should only be called once per | |
991 | function. */ | |
6467930b | 992 | |
8d08fdba | 993 | void |
8d2733ca | 994 | expand_exception_blocks () |
8d08fdba | 995 | { |
e00737d2 | 996 | push_to_sequence (catch_clauses); |
8d2733ca | 997 | expand_leftover_cleanups (); |
e00737d2 | 998 | catch_clauses = get_insns (); |
f30432d7 | 999 | end_sequence (); |
eb448459 | 1000 | |
eb448459 MS |
1001 | /* Do this after we expand leftover cleanups, so that the |
1002 | expand_eh_region_end that expand_end_eh_spec does will match the | |
1003 | right expand_eh_region_start, and make sure it comes out before | |
1004 | the terminate protected region. */ | |
f30432d7 MS |
1005 | if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl))) |
1006 | { | |
eb448459 | 1007 | expand_end_eh_spec (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl))); |
e00737d2 | 1008 | push_to_sequence (catch_clauses); |
eb448459 | 1009 | expand_leftover_cleanups (); |
e00737d2 | 1010 | catch_clauses = get_insns (); |
eb448459 | 1011 | end_sequence (); |
f30432d7 MS |
1012 | } |
1013 | ||
e00737d2 | 1014 | if (catch_clauses) |
f30432d7 | 1015 | { |
e00737d2 MS |
1016 | rtx funcend = gen_label_rtx (); |
1017 | emit_jump (funcend); | |
1018 | ||
eb66be0e MS |
1019 | /* We cannot protect n regions this way if we must flow into the |
1020 | EH region through the top of the region, as we have to with | |
1021 | the setjmp/longjmp approach. */ | |
1022 | if (exceptions_via_longjmp == 0) | |
1023 | { | |
1024 | /* Is this necessary? */ | |
1025 | assemble_external (TREE_OPERAND (Terminate, 0)); | |
1026 | ||
1027 | expand_eh_region_start (); | |
1028 | } | |
f30432d7 | 1029 | |
e00737d2 MS |
1030 | emit_insns (catch_clauses); |
1031 | catch_clauses = NULL_RTX; | |
eb66be0e MS |
1032 | |
1033 | if (exceptions_via_longjmp == 0) | |
1034 | expand_eh_region_end (TerminateFunctionCall); | |
1035 | ||
6467930b | 1036 | expand_leftover_cleanups (); |
f30432d7 | 1037 | |
e00737d2 MS |
1038 | emit_label (funcend); |
1039 | } | |
8d08fdba MS |
1040 | } |
1041 | ||
72b7eeff MS |
1042 | tree |
1043 | start_anon_func () | |
1044 | { | |
1045 | static int counter = 0; | |
e92cc029 | 1046 | int old_interface_unknown = interface_unknown; |
72b7eeff MS |
1047 | char name[32]; |
1048 | tree params; | |
1049 | tree t; | |
1050 | ||
1051 | push_cp_function_context (NULL_TREE); | |
1052 | push_to_top_level (); | |
1053 | ||
1054 | /* No need to mangle this. */ | |
1055 | push_lang_context (lang_name_c); | |
1056 | ||
e92cc029 MS |
1057 | interface_unknown = 1; |
1058 | ||
72b7eeff MS |
1059 | params = void_list_node; |
1060 | /* tcf stands for throw clean funciton. */ | |
1061 | sprintf (name, "__tcf_%d", counter++); | |
c11b6f21 MS |
1062 | t = make_call_declarator (get_identifier (name), params, NULL_TREE, |
1063 | NULL_TREE); | |
72b7eeff MS |
1064 | start_function (decl_tree_cons (NULL_TREE, get_identifier ("static"), |
1065 | void_list_node), | |
c11b6f21 | 1066 | t, NULL_TREE, 0); |
72b7eeff MS |
1067 | store_parm_decls (); |
1068 | pushlevel (0); | |
1069 | clear_last_expr (); | |
1070 | push_momentary (); | |
1071 | expand_start_bindings (0); | |
1072 | emit_line_note (input_filename, lineno); | |
1073 | ||
e92cc029 MS |
1074 | interface_unknown = old_interface_unknown; |
1075 | ||
72b7eeff MS |
1076 | pop_lang_context (); |
1077 | ||
1078 | return current_function_decl; | |
1079 | } | |
1080 | ||
1081 | void | |
1082 | end_anon_func () | |
1083 | { | |
fc378698 | 1084 | expand_end_bindings (getdecls (), 1, 0); |
72b7eeff MS |
1085 | poplevel (1, 0, 0); |
1086 | pop_momentary (); | |
1087 | ||
1088 | finish_function (lineno, 0, 0); | |
1089 | ||
1090 | pop_from_top_level (); | |
1091 | pop_cp_function_context (NULL_TREE); | |
1092 | } | |
8d2733ca | 1093 | |
6467930b | 1094 | /* Expand a throw statement. This follows the following |
8d2733ca MS |
1095 | algorithm: |
1096 | ||
1097 | 1. Allocate space to save the current PC onto the stack. | |
1098 | 2. Generate and emit a label and save its address into the | |
e1cd6e56 | 1099 | newly allocated stack space since we can't save the pc directly. |
8d2733ca MS |
1100 | 3. If this is the first call to throw in this function: |
1101 | generate a label for the throw block | |
1102 | 4. jump to the throw block label. */ | |
6467930b | 1103 | |
8d08fdba | 1104 | void |
8d2733ca MS |
1105 | expand_throw (exp) |
1106 | tree exp; | |
8d08fdba | 1107 | { |
8d2733ca | 1108 | rtx label; |
8d08fdba | 1109 | |
8d2733ca MS |
1110 | if (! doing_eh (1)) |
1111 | return; | |
8d08fdba | 1112 | |
8d2733ca MS |
1113 | if (exp) |
1114 | { | |
faae18ab | 1115 | tree throw_type; |
72b7eeff | 1116 | tree cleanup = empty_fndecl, e; |
faae18ab | 1117 | |
a3b49ccd | 1118 | /* throw expression */ |
e92cc029 | 1119 | /* First, decay it. */ |
f30432d7 | 1120 | exp = decay_conversion (exp); |
a3b49ccd | 1121 | |
f30432d7 MS |
1122 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) |
1123 | { | |
1124 | throw_type = build_eh_type (exp); | |
1125 | exp = build_reinterpret_cast (ptr_type_node, exp); | |
1126 | } | |
1127 | else | |
1128 | { | |
72b7eeff | 1129 | tree object; |
a50f0918 | 1130 | |
f30432d7 MS |
1131 | /* Make a copy of the thrown object. WP 15.1.5 */ |
1132 | exp = build_new (NULL_TREE, TREE_TYPE (exp), | |
1133 | build_tree_list (NULL_TREE, exp), | |
1134 | 0); | |
faae18ab | 1135 | |
f30432d7 MS |
1136 | if (exp == error_mark_node) |
1137 | error (" in thrown expression"); | |
faae18ab | 1138 | |
72b7eeff MS |
1139 | object = build_indirect_ref (exp, NULL_PTR); |
1140 | throw_type = build_eh_type (object); | |
1141 | ||
1142 | start_sequence (); | |
1143 | object = build_reinterpret_cast (TREE_TYPE (exp), saved_throw_value); | |
1144 | object = build_indirect_ref (object, NULL_PTR); | |
c73964b2 | 1145 | cleanup = maybe_build_cleanup_and_delete (object); |
72b7eeff MS |
1146 | end_sequence (); |
1147 | ||
824b9a4c | 1148 | if (cleanup) |
72b7eeff MS |
1149 | { |
1150 | cleanup = start_anon_func (); | |
1151 | ||
c73964b2 MS |
1152 | expand_expr (maybe_build_cleanup_and_delete (object), |
1153 | const0_rtx, VOIDmode, 0); | |
72b7eeff MS |
1154 | |
1155 | end_anon_func (); | |
1156 | ||
1157 | mark_addressable (cleanup); | |
1158 | } | |
1159 | else | |
1160 | { | |
1161 | cleanup = empty_fndecl; | |
1162 | } | |
f30432d7 | 1163 | } |
faae18ab | 1164 | |
be99da77 MS |
1165 | if (cleanup == empty_fndecl) |
1166 | assemble_external (empty_fndecl); | |
1167 | ||
f30432d7 MS |
1168 | e = build_modify_expr (saved_throw_type, NOP_EXPR, throw_type); |
1169 | expand_expr (e, const0_rtx, VOIDmode, 0); | |
72b7eeff | 1170 | |
f30432d7 MS |
1171 | e = build_modify_expr (saved_throw_value, NOP_EXPR, exp); |
1172 | e = build1 (CLEANUP_POINT_EXPR, TREE_TYPE (e), e); | |
1173 | expand_expr (e, const0_rtx, VOIDmode, 0); | |
72b7eeff MS |
1174 | |
1175 | cleanup = build_unary_op (ADDR_EXPR, cleanup, 0); | |
1176 | cleanup = build_modify_expr (saved_cleanup, NOP_EXPR, cleanup); | |
1177 | expand_expr (cleanup, const0_rtx, VOIDmode, 0); | |
8d2733ca MS |
1178 | } |
1179 | else | |
a3b49ccd MS |
1180 | { |
1181 | /* rethrow current exception */ | |
8ccc31eb | 1182 | /* This part is easy, as we don't have to do anything else. */ |
a3b49ccd | 1183 | } |
8d2733ca | 1184 | |
eb66be0e MS |
1185 | if (exceptions_via_longjmp) |
1186 | emit_throw (); | |
1187 | else | |
1188 | { | |
1189 | /* This is the label that represents where in the code we were, when | |
1190 | we got an exception. This needs to be updated when we rethrow an | |
1191 | exception, so that the matching routine knows to search out. */ | |
1192 | label = gen_label_rtx (); | |
1193 | emit_label (label); | |
8d2733ca | 1194 | |
eb66be0e MS |
1195 | expand_internal_throw (label); |
1196 | } | |
f376e137 | 1197 | } |
8d2733ca MS |
1198 | |
1199 | /* Build a throw expression. */ | |
6467930b | 1200 | |
8d2733ca MS |
1201 | tree |
1202 | build_throw (e) | |
1203 | tree e; | |
1204 | { | |
db5ae43f MS |
1205 | if (e != error_mark_node) |
1206 | { | |
5156628f | 1207 | if (processing_template_decl) |
fc378698 | 1208 | return build_min (THROW_EXPR, void_type_node, e); |
db5ae43f MS |
1209 | e = build1 (THROW_EXPR, void_type_node, e); |
1210 | TREE_SIDE_EFFECTS (e) = 1; | |
faae18ab | 1211 | TREE_USED (e) = 1; |
db5ae43f | 1212 | } |
8d2733ca | 1213 | return e; |
8d08fdba | 1214 | } |