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12670d88 | 1 | /* Implements exception handling. |
aeee4812 | 2 | Copyright (C) 1989-2023 Free Software Foundation, Inc. |
4956d07c MS |
3 | Contributed by Mike Stump <mrs@cygnus.com>. |
4 | ||
1322177d | 5 | This file is part of GCC. |
4956d07c | 6 | |
1322177d LB |
7 | GCC is free software; you can redistribute it and/or modify it under |
8 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 9 | Software Foundation; either version 3, or (at your option) any later |
1322177d | 10 | version. |
4956d07c | 11 | |
1322177d LB |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
4956d07c MS |
16 | |
17 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
4956d07c MS |
20 | |
21 | ||
1d65f45c RH |
22 | /* An exception is an event that can be "thrown" from within a |
23 | function. This event can then be "caught" by the callers of | |
24 | the function. | |
25 | ||
26 | The representation of exceptions changes several times during | |
27 | the compilation process: | |
28 | ||
29 | In the beginning, in the front end, we have the GENERIC trees | |
ebebc928 | 30 | TRY_CATCH_EXPR, TRY_FINALLY_EXPR, EH_ELSE_EXPR, WITH_CLEANUP_EXPR, |
1d65f45c RH |
31 | CLEANUP_POINT_EXPR, CATCH_EXPR, and EH_FILTER_EXPR. |
32 | ||
e53b6e56 | 33 | During initial gimplification (gimplify.cc) these are lowered to the |
ebebc928 AO |
34 | GIMPLE_TRY, GIMPLE_CATCH, GIMPLE_EH_ELSE, and GIMPLE_EH_FILTER |
35 | nodes. The WITH_CLEANUP_EXPR and CLEANUP_POINT_EXPR nodes are | |
36 | converted into GIMPLE_TRY_FINALLY nodes; the others are a more | |
37 | direct 1-1 conversion. | |
1d65f45c | 38 | |
e53b6e56 | 39 | During pass_lower_eh (tree-eh.cc) we record the nested structure |
1d65f45c | 40 | of the TRY nodes in EH_REGION nodes in CFUN->EH->REGION_TREE. |
3b06d379 | 41 | We expand the eh_protect_cleanup_actions langhook into MUST_NOT_THROW |
1d65f45c RH |
42 | regions at this time. We can then flatten the statements within |
43 | the TRY nodes to straight-line code. Statements that had been within | |
44 | TRY nodes that can throw are recorded within CFUN->EH->THROW_STMT_TABLE, | |
45 | so that we may remember what action is supposed to be taken if | |
46 | a given statement does throw. During this lowering process, | |
47 | we create an EH_LANDING_PAD node for each EH_REGION that has | |
48 | some code within the function that needs to be executed if a | |
b8698a0f | 49 | throw does happen. We also create RESX statements that are |
1d65f45c RH |
50 | used to transfer control from an inner EH_REGION to an outer |
51 | EH_REGION. We also create EH_DISPATCH statements as placeholders | |
52 | for a runtime type comparison that should be made in order to | |
53 | select the action to perform among different CATCH and EH_FILTER | |
54 | regions. | |
55 | ||
e53b6e56 | 56 | During pass_lower_eh_dispatch (tree-eh.cc), which is run after |
1d65f45c RH |
57 | all inlining is complete, we are able to run assign_filter_values, |
58 | which allows us to map the set of types manipulated by all of the | |
59 | CATCH and EH_FILTER regions to a set of integers. This set of integers | |
60 | will be how the exception runtime communicates with the code generated | |
61 | within the function. We then expand the GIMPLE_EH_DISPATCH statements | |
62 | to a switch or conditional branches that use the argument provided by | |
63 | the runtime (__builtin_eh_filter) and the set of integers we computed | |
64 | in assign_filter_values. | |
65 | ||
e53b6e56 | 66 | During pass_lower_resx (tree-eh.cc), which is run near the end |
1d65f45c RH |
67 | of optimization, we expand RESX statements. If the eh region |
68 | that is outer to the RESX statement is a MUST_NOT_THROW, then | |
69 | the RESX expands to some form of abort statement. If the eh | |
70 | region that is outer to the RESX statement is within the current | |
71 | function, then the RESX expands to a bookkeeping call | |
72 | (__builtin_eh_copy_values) and a goto. Otherwise, the next | |
73 | handler for the exception must be within a function somewhere | |
74 | up the call chain, so we call back into the exception runtime | |
75 | (__builtin_unwind_resume). | |
b8698a0f | 76 | |
e53b6e56 | 77 | During pass_expand (cfgexpand.cc), we generate REG_EH_REGION notes |
1d65f45c RH |
78 | that create an rtl to eh_region mapping that corresponds to the |
79 | gimple to eh_region mapping that had been recorded in the | |
80 | THROW_STMT_TABLE. | |
81 | ||
dac1fbf8 | 82 | Then, via finish_eh_generation, we generate the real landing pads |
1d65f45c RH |
83 | to which the runtime will actually transfer control. These new |
84 | landing pads perform whatever bookkeeping is needed by the target | |
85 | backend in order to resume execution within the current function. | |
86 | Each of these new landing pads falls through into the post_landing_pad | |
87 | label which had been used within the CFG up to this point. All | |
88 | exception edges within the CFG are redirected to the new landing pads. | |
89 | If the target uses setjmp to implement exceptions, the various extra | |
90 | calls into the runtime to register and unregister the current stack | |
91 | frame are emitted at this time. | |
92 | ||
e53b6e56 | 93 | During pass_convert_to_eh_region_ranges (except.cc), we transform |
b8698a0f | 94 | the REG_EH_REGION notes attached to individual insns into |
1d65f45c RH |
95 | non-overlapping ranges of insns bounded by NOTE_INSN_EH_REGION_BEG |
96 | and NOTE_INSN_EH_REGION_END. Each insn within such ranges has the | |
97 | same associated action within the exception region tree, meaning | |
98 | that (1) the exception is caught by the same landing pad within the | |
99 | current function, (2) the exception is blocked by the runtime with | |
100 | a MUST_NOT_THROW region, or (3) the exception is not handled at all | |
101 | within the current function. | |
102 | ||
103 | Finally, during assembly generation, we call | |
e53b6e56 | 104 | output_function_exception_table (except.cc) to emit the tables with |
1d65f45c RH |
105 | which the exception runtime can determine if a given stack frame |
106 | handles a given exception, and if so what filter value to provide | |
107 | to the function when the non-local control transfer is effected. | |
108 | If the target uses dwarf2 unwinding to implement exceptions, then | |
e53b6e56 | 109 | output_call_frame_info (dwarf2out.cc) emits the required unwind data. */ |
4956d07c MS |
110 | |
111 | ||
112 | #include "config.h" | |
670ee920 | 113 | #include "system.h" |
4977bab6 | 114 | #include "coretypes.h" |
c7131fb2 | 115 | #include "backend.h" |
957060b5 | 116 | #include "target.h" |
4956d07c MS |
117 | #include "rtl.h" |
118 | #include "tree.h" | |
957060b5 AM |
119 | #include "cfghooks.h" |
120 | #include "tree-pass.h" | |
4d0cdd0c | 121 | #include "memmodel.h" |
957060b5 | 122 | #include "tm_p.h" |
d8a2d370 | 123 | #include "stringpool.h" |
957060b5 AM |
124 | #include "expmed.h" |
125 | #include "optabs.h" | |
126 | #include "emit-rtl.h" | |
127 | #include "cgraph.h" | |
128 | #include "diagnostic.h" | |
957060b5 | 129 | #include "fold-const.h" |
d8a2d370 | 130 | #include "stor-layout.h" |
36566b39 | 131 | #include "explow.h" |
36566b39 | 132 | #include "stmt.h" |
4956d07c | 133 | #include "expr.h" |
ee516de9 | 134 | #include "calls.h" |
e78d8e51 | 135 | #include "libfuncs.h" |
52a11cbf | 136 | #include "except.h" |
4956d07c | 137 | #include "output.h" |
52a11cbf | 138 | #include "dwarf2asm.h" |
5b1ce655 | 139 | #include "dwarf2.h" |
677f3fa8 | 140 | #include "common/common-target.h" |
f1e639b1 | 141 | #include "langhooks.h" |
60393bbc | 142 | #include "cfgrtl.h" |
cf835838 | 143 | #include "tree-pretty-print.h" |
7d776ee2 | 144 | #include "cfgloop.h" |
9b2b7279 | 145 | #include "builtins.h" |
84a98514 | 146 | #include "tree-hash-traits.h" |
66168f96 | 147 | #include "flags.h" |
52a11cbf | 148 | |
21c157b4 | 149 | static GTY(()) int call_site_base; |
b086d530 | 150 | |
2ab71f3d EB |
151 | static GTY(()) hash_map<tree_hash, tree> *type_to_runtime_map; |
152 | ||
153 | static GTY(()) tree setjmp_fn; | |
52a11cbf RH |
154 | |
155 | /* Describe the SjLj_Function_Context structure. */ | |
e2500fed | 156 | static GTY(()) tree sjlj_fc_type_node; |
52a11cbf RH |
157 | static int sjlj_fc_call_site_ofs; |
158 | static int sjlj_fc_data_ofs; | |
159 | static int sjlj_fc_personality_ofs; | |
160 | static int sjlj_fc_lsda_ofs; | |
161 | static int sjlj_fc_jbuf_ofs; | |
162 | \f | |
0856ee98 | 163 | |
7e5487a2 | 164 | struct GTY(()) call_site_record_d |
e2500fed GK |
165 | { |
166 | rtx landing_pad; | |
167 | int action; | |
168 | }; | |
4a8fb1a1 LC |
169 | |
170 | /* In the following structure and associated functions, | |
171 | we represent entries in the action table as 1-based indices. | |
172 | Special cases are: | |
173 | ||
174 | 0: null action record, non-null landing pad; implies cleanups | |
175 | -1: null action record, null landing pad; implies no action | |
176 | -2: no call-site entry; implies must_not_throw | |
177 | -3: we have yet to process outer regions | |
178 | ||
179 | Further, no special cases apply to the "next" field of the record. | |
180 | For next, 0 means end of list. */ | |
181 | ||
182 | struct action_record | |
183 | { | |
184 | int offset; | |
185 | int filter; | |
186 | int next; | |
187 | }; | |
188 | ||
189 | /* Hashtable helpers. */ | |
190 | ||
95fbe13e | 191 | struct action_record_hasher : free_ptr_hash <action_record> |
4a8fb1a1 | 192 | { |
67f58944 TS |
193 | static inline hashval_t hash (const action_record *); |
194 | static inline bool equal (const action_record *, const action_record *); | |
4a8fb1a1 LC |
195 | }; |
196 | ||
197 | inline hashval_t | |
67f58944 | 198 | action_record_hasher::hash (const action_record *entry) |
4a8fb1a1 LC |
199 | { |
200 | return entry->next * 1009 + entry->filter; | |
201 | } | |
202 | ||
203 | inline bool | |
67f58944 TS |
204 | action_record_hasher::equal (const action_record *entry, |
205 | const action_record *data) | |
4a8fb1a1 LC |
206 | { |
207 | return entry->filter == data->filter && entry->next == data->next; | |
208 | } | |
209 | ||
c203e8a7 | 210 | typedef hash_table<action_record_hasher> action_hash_type; |
52a11cbf | 211 | \f |
1d65f45c RH |
212 | static bool get_eh_region_and_lp_from_rtx (const_rtx, eh_region *, |
213 | eh_landing_pad *); | |
214 | ||
502b8322 | 215 | static void dw2_build_landing_pads (void); |
52a11cbf | 216 | |
c203e8a7 | 217 | static int collect_one_action_chain (action_hash_type *, eh_region); |
17f6e37d | 218 | static int add_call_site (rtx, int, int); |
502b8322 | 219 | |
9771b263 DN |
220 | static void push_uleb128 (vec<uchar, va_gc> **, unsigned int); |
221 | static void push_sleb128 (vec<uchar, va_gc> **, int); | |
b84b6ee6 | 222 | static int dw2_size_of_call_site_table (int); |
502b8322 | 223 | static int sjlj_size_of_call_site_table (void); |
17f6e37d | 224 | static void dw2_output_call_site_table (int, int); |
502b8322 | 225 | static void sjlj_output_call_site_table (void); |
e6cfb550 | 226 | |
52a11cbf RH |
227 | \f |
228 | void | |
502b8322 | 229 | init_eh (void) |
4956d07c | 230 | { |
52a11cbf RH |
231 | if (! flag_exceptions) |
232 | return; | |
4956d07c | 233 | |
fb5c464a | 234 | type_to_runtime_map = hash_map<tree_hash, tree>::create_ggc (31); |
4956d07c | 235 | |
52a11cbf RH |
236 | /* Create the SjLj_Function_Context structure. This should match |
237 | the definition in unwind-sjlj.c. */ | |
677f3fa8 | 238 | if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ) |
52a11cbf RH |
239 | { |
240 | tree f_jbuf, f_per, f_lsda, f_prev, f_cs, f_data, tmp; | |
4956d07c | 241 | |
ae2bcd98 | 242 | sjlj_fc_type_node = lang_hooks.types.make_type (RECORD_TYPE); |
9a0d1e1b | 243 | |
d40eb158 | 244 | f_prev = build_decl (BUILTINS_LOCATION, |
c2255bc4 | 245 | FIELD_DECL, get_identifier ("__prev"), |
52a11cbf RH |
246 | build_pointer_type (sjlj_fc_type_node)); |
247 | DECL_FIELD_CONTEXT (f_prev) = sjlj_fc_type_node; | |
9a0d1e1b | 248 | |
d40eb158 | 249 | f_cs = build_decl (BUILTINS_LOCATION, |
c2255bc4 | 250 | FIELD_DECL, get_identifier ("__call_site"), |
52a11cbf RH |
251 | integer_type_node); |
252 | DECL_FIELD_CONTEXT (f_cs) = sjlj_fc_type_node; | |
4956d07c | 253 | |
45a2c477 | 254 | tmp = build_index_type (size_int (4 - 1)); |
7b0518e3 UW |
255 | tmp = build_array_type (lang_hooks.types.type_for_mode |
256 | (targetm.unwind_word_mode (), 1), | |
b0c48229 | 257 | tmp); |
d40eb158 | 258 | f_data = build_decl (BUILTINS_LOCATION, |
c2255bc4 | 259 | FIELD_DECL, get_identifier ("__data"), tmp); |
52a11cbf | 260 | DECL_FIELD_CONTEXT (f_data) = sjlj_fc_type_node; |
9a0d1e1b | 261 | |
d40eb158 | 262 | f_per = build_decl (BUILTINS_LOCATION, |
c2255bc4 | 263 | FIELD_DECL, get_identifier ("__personality"), |
52a11cbf RH |
264 | ptr_type_node); |
265 | DECL_FIELD_CONTEXT (f_per) = sjlj_fc_type_node; | |
4956d07c | 266 | |
d40eb158 | 267 | f_lsda = build_decl (BUILTINS_LOCATION, |
c2255bc4 | 268 | FIELD_DECL, get_identifier ("__lsda"), |
52a11cbf RH |
269 | ptr_type_node); |
270 | DECL_FIELD_CONTEXT (f_lsda) = sjlj_fc_type_node; | |
6814a8a0 | 271 | |
52a11cbf RH |
272 | #ifdef DONT_USE_BUILTIN_SETJMP |
273 | #ifdef JMP_BUF_SIZE | |
45a2c477 | 274 | tmp = size_int (JMP_BUF_SIZE - 1); |
52a11cbf RH |
275 | #else |
276 | /* Should be large enough for most systems, if it is not, | |
277 | JMP_BUF_SIZE should be defined with the proper value. It will | |
278 | also tend to be larger than necessary for most systems, a more | |
279 | optimal port will define JMP_BUF_SIZE. */ | |
45a2c477 | 280 | tmp = size_int (FIRST_PSEUDO_REGISTER + 2 - 1); |
52a11cbf RH |
281 | #endif |
282 | #else | |
40ba8dfb NC |
283 | /* Compute a minimally sized jump buffer. We need room to store at |
284 | least 3 pointers - stack pointer, frame pointer and return address. | |
285 | Plus for some targets we need room for an extra pointer - in the | |
286 | case of MIPS this is the global pointer. This makes a total of four | |
287 | pointers, but to be safe we actually allocate room for 5. | |
288 | ||
289 | If pointers are smaller than words then we allocate enough room for | |
290 | 5 words, just in case the backend needs this much room. For more | |
291 | discussion on this issue see: | |
292 | http://gcc.gnu.org/ml/gcc-patches/2014-05/msg00313.html. */ | |
293 | if (POINTER_SIZE > BITS_PER_WORD) | |
294 | tmp = size_int (5 - 1); | |
295 | else | |
296 | tmp = size_int ((5 * BITS_PER_WORD / POINTER_SIZE) - 1); | |
52a11cbf | 297 | #endif |
40ba8dfb | 298 | |
52a11cbf RH |
299 | tmp = build_index_type (tmp); |
300 | tmp = build_array_type (ptr_type_node, tmp); | |
d40eb158 | 301 | f_jbuf = build_decl (BUILTINS_LOCATION, |
c2255bc4 | 302 | FIELD_DECL, get_identifier ("__jbuf"), tmp); |
52a11cbf RH |
303 | #ifdef DONT_USE_BUILTIN_SETJMP |
304 | /* We don't know what the alignment requirements of the | |
305 | runtime's jmp_buf has. Overestimate. */ | |
fe37c7af | 306 | SET_DECL_ALIGN (f_jbuf, BIGGEST_ALIGNMENT); |
52a11cbf RH |
307 | DECL_USER_ALIGN (f_jbuf) = 1; |
308 | #endif | |
309 | DECL_FIELD_CONTEXT (f_jbuf) = sjlj_fc_type_node; | |
310 | ||
311 | TYPE_FIELDS (sjlj_fc_type_node) = f_prev; | |
312 | TREE_CHAIN (f_prev) = f_cs; | |
313 | TREE_CHAIN (f_cs) = f_data; | |
314 | TREE_CHAIN (f_data) = f_per; | |
315 | TREE_CHAIN (f_per) = f_lsda; | |
316 | TREE_CHAIN (f_lsda) = f_jbuf; | |
317 | ||
318 | layout_type (sjlj_fc_type_node); | |
319 | ||
320 | /* Cache the interesting field offsets so that we have | |
321 | easy access from rtl. */ | |
322 | sjlj_fc_call_site_ofs | |
ae7e9ddd RS |
323 | = (tree_to_uhwi (DECL_FIELD_OFFSET (f_cs)) |
324 | + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (f_cs)) / BITS_PER_UNIT); | |
52a11cbf | 325 | sjlj_fc_data_ofs |
ae7e9ddd RS |
326 | = (tree_to_uhwi (DECL_FIELD_OFFSET (f_data)) |
327 | + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (f_data)) / BITS_PER_UNIT); | |
52a11cbf | 328 | sjlj_fc_personality_ofs |
ae7e9ddd RS |
329 | = (tree_to_uhwi (DECL_FIELD_OFFSET (f_per)) |
330 | + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (f_per)) / BITS_PER_UNIT); | |
52a11cbf | 331 | sjlj_fc_lsda_ofs |
ae7e9ddd RS |
332 | = (tree_to_uhwi (DECL_FIELD_OFFSET (f_lsda)) |
333 | + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (f_lsda)) / BITS_PER_UNIT); | |
52a11cbf | 334 | sjlj_fc_jbuf_ofs |
ae7e9ddd RS |
335 | = (tree_to_uhwi (DECL_FIELD_OFFSET (f_jbuf)) |
336 | + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (f_jbuf)) / BITS_PER_UNIT); | |
2ab71f3d EB |
337 | |
338 | #ifdef DONT_USE_BUILTIN_SETJMP | |
339 | tmp = build_function_type_list (integer_type_node, TREE_TYPE (f_jbuf), | |
340 | NULL); | |
341 | setjmp_fn = build_decl (BUILTINS_LOCATION, FUNCTION_DECL, | |
342 | get_identifier ("setjmp"), tmp); | |
343 | TREE_PUBLIC (setjmp_fn) = 1; | |
344 | DECL_EXTERNAL (setjmp_fn) = 1; | |
345 | DECL_ASSEMBLER_NAME (setjmp_fn); | |
346 | #endif | |
52a11cbf | 347 | } |
4956d07c MS |
348 | } |
349 | ||
52a11cbf | 350 | void |
502b8322 | 351 | init_eh_for_function (void) |
4956d07c | 352 | { |
766090c2 | 353 | cfun->eh = ggc_cleared_alloc<eh_status> (); |
1d65f45c RH |
354 | |
355 | /* Make sure zero'th entries are used. */ | |
9771b263 DN |
356 | vec_safe_push (cfun->eh->region_array, (eh_region)0); |
357 | vec_safe_push (cfun->eh->lp_array, (eh_landing_pad)0); | |
6a58eee9 | 358 | } |
52a11cbf | 359 | \f |
083cad55 | 360 | /* Routines to generate the exception tree somewhat directly. |
e53b6e56 | 361 | These are used from tree-eh.cc when processing exception related |
6de9cd9a DN |
362 | nodes during tree optimization. */ |
363 | ||
1d65f45c RH |
364 | static eh_region |
365 | gen_eh_region (enum eh_region_type type, eh_region outer) | |
6de9cd9a | 366 | { |
1d65f45c | 367 | eh_region new_eh; |
6de9cd9a | 368 | |
6de9cd9a | 369 | /* Insert a new blank region as a leaf in the tree. */ |
766090c2 | 370 | new_eh = ggc_cleared_alloc<eh_region_d> (); |
d858f359 KG |
371 | new_eh->type = type; |
372 | new_eh->outer = outer; | |
6de9cd9a DN |
373 | if (outer) |
374 | { | |
d858f359 KG |
375 | new_eh->next_peer = outer->inner; |
376 | outer->inner = new_eh; | |
6de9cd9a DN |
377 | } |
378 | else | |
379 | { | |
d858f359 KG |
380 | new_eh->next_peer = cfun->eh->region_tree; |
381 | cfun->eh->region_tree = new_eh; | |
6de9cd9a DN |
382 | } |
383 | ||
9771b263 DN |
384 | new_eh->index = vec_safe_length (cfun->eh->region_array); |
385 | vec_safe_push (cfun->eh->region_array, new_eh); | |
6de9cd9a | 386 | |
384c400a RH |
387 | /* Copy the language's notion of whether to use __cxa_end_cleanup. */ |
388 | if (targetm.arm_eabi_unwinder && lang_hooks.eh_use_cxa_end_cleanup) | |
389 | new_eh->use_cxa_end_cleanup = true; | |
390 | ||
d858f359 | 391 | return new_eh; |
6de9cd9a DN |
392 | } |
393 | ||
1d65f45c RH |
394 | eh_region |
395 | gen_eh_region_cleanup (eh_region outer) | |
6de9cd9a | 396 | { |
1d65f45c | 397 | return gen_eh_region (ERT_CLEANUP, outer); |
6de9cd9a DN |
398 | } |
399 | ||
1d65f45c RH |
400 | eh_region |
401 | gen_eh_region_try (eh_region outer) | |
6de9cd9a DN |
402 | { |
403 | return gen_eh_region (ERT_TRY, outer); | |
404 | } | |
405 | ||
1d65f45c RH |
406 | eh_catch |
407 | gen_eh_region_catch (eh_region t, tree type_or_list) | |
6de9cd9a | 408 | { |
1d65f45c | 409 | eh_catch c, l; |
6de9cd9a DN |
410 | tree type_list, type_node; |
411 | ||
1d65f45c RH |
412 | gcc_assert (t->type == ERT_TRY); |
413 | ||
6de9cd9a DN |
414 | /* Ensure to always end up with a type list to normalize further |
415 | processing, then register each type against the runtime types map. */ | |
416 | type_list = type_or_list; | |
417 | if (type_or_list) | |
418 | { | |
419 | if (TREE_CODE (type_or_list) != TREE_LIST) | |
420 | type_list = tree_cons (NULL_TREE, type_or_list, NULL_TREE); | |
421 | ||
422 | type_node = type_list; | |
423 | for (; type_node; type_node = TREE_CHAIN (type_node)) | |
424 | add_type_for_runtime (TREE_VALUE (type_node)); | |
425 | } | |
426 | ||
766090c2 | 427 | c = ggc_cleared_alloc<eh_catch_d> (); |
1d65f45c | 428 | c->type_list = type_list; |
82d6e6fc | 429 | l = t->u.eh_try.last_catch; |
1d65f45c | 430 | c->prev_catch = l; |
6de9cd9a | 431 | if (l) |
1d65f45c | 432 | l->next_catch = c; |
6de9cd9a | 433 | else |
1d65f45c | 434 | t->u.eh_try.first_catch = c; |
82d6e6fc | 435 | t->u.eh_try.last_catch = c; |
6de9cd9a DN |
436 | |
437 | return c; | |
438 | } | |
439 | ||
1d65f45c RH |
440 | eh_region |
441 | gen_eh_region_allowed (eh_region outer, tree allowed) | |
6de9cd9a | 442 | { |
1d65f45c | 443 | eh_region region = gen_eh_region (ERT_ALLOWED_EXCEPTIONS, outer); |
6de9cd9a DN |
444 | region->u.allowed.type_list = allowed; |
445 | ||
446 | for (; allowed ; allowed = TREE_CHAIN (allowed)) | |
447 | add_type_for_runtime (TREE_VALUE (allowed)); | |
448 | ||
449 | return region; | |
450 | } | |
451 | ||
1d65f45c RH |
452 | eh_region |
453 | gen_eh_region_must_not_throw (eh_region outer) | |
6de9cd9a DN |
454 | { |
455 | return gen_eh_region (ERT_MUST_NOT_THROW, outer); | |
456 | } | |
457 | ||
1d65f45c RH |
458 | eh_landing_pad |
459 | gen_eh_landing_pad (eh_region region) | |
6de9cd9a | 460 | { |
766090c2 | 461 | eh_landing_pad lp = ggc_cleared_alloc<eh_landing_pad_d> (); |
6de9cd9a | 462 | |
1d65f45c RH |
463 | lp->next_lp = region->landing_pads; |
464 | lp->region = region; | |
9771b263 | 465 | lp->index = vec_safe_length (cfun->eh->lp_array); |
1d65f45c RH |
466 | region->landing_pads = lp; |
467 | ||
9771b263 | 468 | vec_safe_push (cfun->eh->lp_array, lp); |
1d65f45c RH |
469 | |
470 | return lp; | |
6de9cd9a DN |
471 | } |
472 | ||
1d65f45c RH |
473 | eh_region |
474 | get_eh_region_from_number_fn (struct function *ifun, int i) | |
6de9cd9a | 475 | { |
9771b263 | 476 | return (*ifun->eh->region_array)[i]; |
6de9cd9a DN |
477 | } |
478 | ||
1d65f45c RH |
479 | eh_region |
480 | get_eh_region_from_number (int i) | |
4e6d1743 | 481 | { |
1d65f45c | 482 | return get_eh_region_from_number_fn (cfun, i); |
4e6d1743 JH |
483 | } |
484 | ||
1d65f45c RH |
485 | eh_landing_pad |
486 | get_eh_landing_pad_from_number_fn (struct function *ifun, int i) | |
6de9cd9a | 487 | { |
9771b263 | 488 | return (*ifun->eh->lp_array)[i]; |
6de9cd9a | 489 | } |
6de9cd9a | 490 | |
1d65f45c RH |
491 | eh_landing_pad |
492 | get_eh_landing_pad_from_number (int i) | |
493 | { | |
494 | return get_eh_landing_pad_from_number_fn (cfun, i); | |
6de9cd9a DN |
495 | } |
496 | ||
1d65f45c RH |
497 | eh_region |
498 | get_eh_region_from_lp_number_fn (struct function *ifun, int i) | |
b2dd096b | 499 | { |
1d65f45c | 500 | if (i < 0) |
9771b263 | 501 | return (*ifun->eh->region_array)[-i]; |
1d65f45c RH |
502 | else if (i == 0) |
503 | return NULL; | |
504 | else | |
b2dd096b | 505 | { |
1d65f45c | 506 | eh_landing_pad lp; |
9771b263 | 507 | lp = (*ifun->eh->lp_array)[i]; |
1d65f45c | 508 | return lp->region; |
b2dd096b MM |
509 | } |
510 | } | |
511 | ||
1d65f45c RH |
512 | eh_region |
513 | get_eh_region_from_lp_number (int i) | |
4956d07c | 514 | { |
1d65f45c | 515 | return get_eh_region_from_lp_number_fn (cfun, i); |
52a11cbf | 516 | } |
1d65f45c RH |
517 | \f |
518 | /* Returns true if the current function has exception handling regions. */ | |
4956d07c | 519 | |
1d65f45c RH |
520 | bool |
521 | current_function_has_exception_handlers (void) | |
47c84870 | 522 | { |
1d65f45c | 523 | return cfun->eh->region_tree != NULL; |
47c84870 | 524 | } |
52a11cbf | 525 | \f |
1d65f45c RH |
526 | /* A subroutine of duplicate_eh_regions. Copy the eh_region tree at OLD. |
527 | Root it at OUTER, and apply LP_OFFSET to the lp numbers. */ | |
154bba13 | 528 | |
1d65f45c | 529 | struct duplicate_eh_regions_data |
154bba13 | 530 | { |
1d65f45c RH |
531 | duplicate_eh_regions_map label_map; |
532 | void *label_map_data; | |
b787e7a2 | 533 | hash_map<void *, void *> *eh_map; |
1d65f45c | 534 | }; |
154bba13 | 535 | |
1d65f45c RH |
536 | static void |
537 | duplicate_eh_regions_1 (struct duplicate_eh_regions_data *data, | |
538 | eh_region old_r, eh_region outer) | |
539 | { | |
540 | eh_landing_pad old_lp, new_lp; | |
541 | eh_region new_r; | |
154bba13 | 542 | |
1d65f45c | 543 | new_r = gen_eh_region (old_r->type, outer); |
b787e7a2 | 544 | gcc_assert (!data->eh_map->put (old_r, new_r)); |
154bba13 | 545 | |
1d65f45c | 546 | switch (old_r->type) |
52a11cbf | 547 | { |
1d65f45c RH |
548 | case ERT_CLEANUP: |
549 | break; | |
52a11cbf | 550 | |
1d65f45c RH |
551 | case ERT_TRY: |
552 | { | |
553 | eh_catch oc, nc; | |
554 | for (oc = old_r->u.eh_try.first_catch; oc ; oc = oc->next_catch) | |
555 | { | |
556 | /* We should be doing all our region duplication before and | |
557 | during inlining, which is before filter lists are created. */ | |
558 | gcc_assert (oc->filter_list == NULL); | |
559 | nc = gen_eh_region_catch (new_r, oc->type_list); | |
560 | nc->label = data->label_map (oc->label, data->label_map_data); | |
561 | } | |
562 | } | |
563 | break; | |
27a36778 | 564 | |
1d65f45c RH |
565 | case ERT_ALLOWED_EXCEPTIONS: |
566 | new_r->u.allowed.type_list = old_r->u.allowed.type_list; | |
6728ee79 MM |
567 | if (old_r->u.allowed.label) |
568 | new_r->u.allowed.label | |
569 | = data->label_map (old_r->u.allowed.label, data->label_map_data); | |
570 | else | |
571 | new_r->u.allowed.label = NULL_TREE; | |
1d65f45c | 572 | break; |
655dd289 | 573 | |
1d65f45c | 574 | case ERT_MUST_NOT_THROW: |
5368224f DC |
575 | new_r->u.must_not_throw.failure_loc = |
576 | LOCATION_LOCUS (old_r->u.must_not_throw.failure_loc); | |
577 | new_r->u.must_not_throw.failure_decl = | |
578 | old_r->u.must_not_throw.failure_decl; | |
1d65f45c RH |
579 | break; |
580 | } | |
a8da523f | 581 | |
1d65f45c | 582 | for (old_lp = old_r->landing_pads; old_lp ; old_lp = old_lp->next_lp) |
655dd289 | 583 | { |
1d65f45c RH |
584 | /* Don't bother copying unused landing pads. */ |
585 | if (old_lp->post_landing_pad == NULL) | |
586 | continue; | |
a8da523f | 587 | |
1d65f45c | 588 | new_lp = gen_eh_landing_pad (new_r); |
b787e7a2 | 589 | gcc_assert (!data->eh_map->put (old_lp, new_lp)); |
1d65f45c RH |
590 | |
591 | new_lp->post_landing_pad | |
592 | = data->label_map (old_lp->post_landing_pad, data->label_map_data); | |
593 | EH_LANDING_PAD_NR (new_lp->post_landing_pad) = new_lp->index; | |
655dd289 | 594 | } |
1d65f45c | 595 | |
384c400a RH |
596 | /* Make sure to preserve the original use of __cxa_end_cleanup. */ |
597 | new_r->use_cxa_end_cleanup = old_r->use_cxa_end_cleanup; | |
598 | ||
1d65f45c RH |
599 | for (old_r = old_r->inner; old_r ; old_r = old_r->next_peer) |
600 | duplicate_eh_regions_1 (data, old_r, new_r); | |
a8da523f | 601 | } |
655dd289 | 602 | |
1d65f45c RH |
603 | /* Duplicate the EH regions from IFUN rooted at COPY_REGION into |
604 | the current function and root the tree below OUTER_REGION. | |
605 | The special case of COPY_REGION of NULL means all regions. | |
606 | Remap labels using MAP/MAP_DATA callback. Return a pointer map | |
607 | that allows the caller to remap uses of both EH regions and | |
608 | EH landing pads. */ | |
14925fcd | 609 | |
b787e7a2 | 610 | hash_map<void *, void *> * |
1d65f45c RH |
611 | duplicate_eh_regions (struct function *ifun, |
612 | eh_region copy_region, int outer_lp, | |
613 | duplicate_eh_regions_map map, void *map_data) | |
14925fcd | 614 | { |
1d65f45c RH |
615 | struct duplicate_eh_regions_data data; |
616 | eh_region outer_region; | |
14925fcd | 617 | |
b2b29377 MM |
618 | if (flag_checking) |
619 | verify_eh_tree (ifun); | |
a3710436 | 620 | |
1d65f45c RH |
621 | data.label_map = map; |
622 | data.label_map_data = map_data; | |
b787e7a2 | 623 | data.eh_map = new hash_map<void *, void *>; |
a3710436 | 624 | |
b0dd8c90 | 625 | outer_region = get_eh_region_from_lp_number_fn (cfun, outer_lp); |
b8698a0f | 626 | |
1d65f45c RH |
627 | /* Copy all the regions in the subtree. */ |
628 | if (copy_region) | |
629 | duplicate_eh_regions_1 (&data, copy_region, outer_region); | |
630 | else | |
a3710436 | 631 | { |
1d65f45c RH |
632 | eh_region r; |
633 | for (r = ifun->eh->region_tree; r ; r = r->next_peer) | |
634 | duplicate_eh_regions_1 (&data, r, outer_region); | |
a3710436 | 635 | } |
a3710436 | 636 | |
b2b29377 MM |
637 | if (flag_checking) |
638 | verify_eh_tree (cfun); | |
a3710436 | 639 | |
1d65f45c | 640 | return data.eh_map; |
a3710436 JH |
641 | } |
642 | ||
1d65f45c | 643 | /* Return the region that is outer to both REGION_A and REGION_B in IFUN. */ |
a3710436 | 644 | |
1d65f45c RH |
645 | eh_region |
646 | eh_region_outermost (struct function *ifun, eh_region region_a, | |
647 | eh_region region_b) | |
a3710436 | 648 | { |
1d65f45c RH |
649 | gcc_assert (ifun->eh->region_array); |
650 | gcc_assert (ifun->eh->region_tree); | |
a3710436 | 651 | |
7ba9e72d | 652 | auto_sbitmap b_outer (ifun->eh->region_array->length ()); |
f61e445a | 653 | bitmap_clear (b_outer); |
a3710436 | 654 | |
1d65f45c RH |
655 | do |
656 | { | |
d7c028c0 | 657 | bitmap_set_bit (b_outer, region_b->index); |
1d65f45c RH |
658 | region_b = region_b->outer; |
659 | } | |
660 | while (region_b); | |
a3710436 | 661 | |
1d65f45c | 662 | do |
a3710436 | 663 | { |
d7c028c0 | 664 | if (bitmap_bit_p (b_outer, region_a->index)) |
a3710436 | 665 | break; |
1d65f45c | 666 | region_a = region_a->outer; |
a3710436 | 667 | } |
1d65f45c | 668 | while (region_a); |
a3710436 | 669 | |
1d65f45c RH |
670 | return region_a; |
671 | } | |
672 | \f | |
1d65f45c RH |
673 | void |
674 | add_type_for_runtime (tree type) | |
675 | { | |
1d65f45c RH |
676 | /* If TYPE is NOP_EXPR, it means that it already is a runtime type. */ |
677 | if (TREE_CODE (type) == NOP_EXPR) | |
678 | return; | |
a3710436 | 679 | |
b086d530 TS |
680 | bool existed = false; |
681 | tree *slot = &type_to_runtime_map->get_or_insert (type, &existed); | |
682 | if (!existed) | |
683 | *slot = lang_hooks.eh_runtime_type (type); | |
a3710436 JH |
684 | } |
685 | ||
1d65f45c RH |
686 | tree |
687 | lookup_type_for_runtime (tree type) | |
a8da523f | 688 | { |
1d65f45c RH |
689 | /* If TYPE is NOP_EXPR, it means that it already is a runtime type. */ |
690 | if (TREE_CODE (type) == NOP_EXPR) | |
691 | return type; | |
a8da523f | 692 | |
1d65f45c | 693 | /* We should have always inserted the data earlier. */ |
b086d530 | 694 | return *type_to_runtime_map->get (type); |
1d65f45c | 695 | } |
083cad55 | 696 | |
1d65f45c RH |
697 | \f |
698 | /* Represent an entry in @TTypes for either catch actions | |
699 | or exception filter actions. */ | |
1aa67003 | 700 | struct ttypes_filter { |
1d65f45c RH |
701 | tree t; |
702 | int filter; | |
703 | }; | |
14925fcd | 704 | |
4a8fb1a1 LC |
705 | /* Helper for ttypes_filter hashing. */ |
706 | ||
95fbe13e | 707 | struct ttypes_filter_hasher : free_ptr_hash <ttypes_filter> |
4a8fb1a1 | 708 | { |
67f58944 TS |
709 | typedef tree_node *compare_type; |
710 | static inline hashval_t hash (const ttypes_filter *); | |
711 | static inline bool equal (const ttypes_filter *, const tree_node *); | |
4a8fb1a1 LC |
712 | }; |
713 | ||
1d65f45c RH |
714 | /* Compare ENTRY (a ttypes_filter entry in the hash table) with DATA |
715 | (a tree) for a @TTypes type node we are thinking about adding. */ | |
14925fcd | 716 | |
4a8fb1a1 | 717 | inline bool |
67f58944 | 718 | ttypes_filter_hasher::equal (const ttypes_filter *entry, const tree_node *data) |
1d65f45c | 719 | { |
52a11cbf | 720 | return entry->t == data; |
9762d48d JM |
721 | } |
722 | ||
4a8fb1a1 | 723 | inline hashval_t |
67f58944 | 724 | ttypes_filter_hasher::hash (const ttypes_filter *entry) |
52a11cbf | 725 | { |
fd917e0d | 726 | return TREE_HASH (entry->t); |
52a11cbf | 727 | } |
4956d07c | 728 | |
c203e8a7 | 729 | typedef hash_table<ttypes_filter_hasher> ttypes_hash_type; |
4a8fb1a1 LC |
730 | |
731 | ||
732 | /* Helper for ehspec hashing. */ | |
733 | ||
95fbe13e | 734 | struct ehspec_hasher : free_ptr_hash <ttypes_filter> |
4a8fb1a1 | 735 | { |
67f58944 TS |
736 | static inline hashval_t hash (const ttypes_filter *); |
737 | static inline bool equal (const ttypes_filter *, const ttypes_filter *); | |
4a8fb1a1 LC |
738 | }; |
739 | ||
52a11cbf RH |
740 | /* Compare ENTRY with DATA (both struct ttypes_filter) for a @TTypes |
741 | exception specification list we are thinking about adding. */ | |
742 | /* ??? Currently we use the type lists in the order given. Someone | |
743 | should put these in some canonical order. */ | |
744 | ||
4a8fb1a1 | 745 | inline bool |
67f58944 | 746 | ehspec_hasher::equal (const ttypes_filter *entry, const ttypes_filter *data) |
4956d07c | 747 | { |
52a11cbf | 748 | return type_list_equal (entry->t, data->t); |
4956d07c MS |
749 | } |
750 | ||
52a11cbf | 751 | /* Hash function for exception specification lists. */ |
4956d07c | 752 | |
4a8fb1a1 | 753 | inline hashval_t |
67f58944 | 754 | ehspec_hasher::hash (const ttypes_filter *entry) |
4956d07c | 755 | { |
52a11cbf RH |
756 | hashval_t h = 0; |
757 | tree list; | |
758 | ||
759 | for (list = entry->t; list ; list = TREE_CHAIN (list)) | |
fd917e0d | 760 | h = (h << 5) + (h >> 27) + TREE_HASH (TREE_VALUE (list)); |
52a11cbf | 761 | return h; |
4956d07c MS |
762 | } |
763 | ||
c203e8a7 | 764 | typedef hash_table<ehspec_hasher> ehspec_hash_type; |
4a8fb1a1 LC |
765 | |
766 | ||
1d65f45c | 767 | /* Add TYPE (which may be NULL) to cfun->eh->ttype_data, using TYPES_HASH |
fd917e0d | 768 | to speed up the search. Return the filter value to be used. */ |
4956d07c | 769 | |
52a11cbf | 770 | static int |
c203e8a7 | 771 | add_ttypes_entry (ttypes_hash_type *ttypes_hash, tree type) |
4956d07c | 772 | { |
52a11cbf | 773 | struct ttypes_filter **slot, *n; |
4956d07c | 774 | |
c203e8a7 | 775 | slot = ttypes_hash->find_slot_with_hash (type, (hashval_t) TREE_HASH (type), |
4a8fb1a1 | 776 | INSERT); |
52a11cbf RH |
777 | |
778 | if ((n = *slot) == NULL) | |
4956d07c | 779 | { |
52a11cbf | 780 | /* Filter value is a 1 based table index. */ |
12670d88 | 781 | |
5ed6ace5 | 782 | n = XNEW (struct ttypes_filter); |
52a11cbf | 783 | n->t = type; |
9771b263 | 784 | n->filter = vec_safe_length (cfun->eh->ttype_data) + 1; |
52a11cbf RH |
785 | *slot = n; |
786 | ||
9771b263 | 787 | vec_safe_push (cfun->eh->ttype_data, type); |
4956d07c | 788 | } |
52a11cbf RH |
789 | |
790 | return n->filter; | |
4956d07c MS |
791 | } |
792 | ||
1d65f45c | 793 | /* Add LIST to cfun->eh->ehspec_data, using EHSPEC_HASH and TYPES_HASH |
52a11cbf RH |
794 | to speed up the search. Return the filter value to be used. */ |
795 | ||
796 | static int | |
c203e8a7 | 797 | add_ehspec_entry (ehspec_hash_type *ehspec_hash, ttypes_hash_type *ttypes_hash, |
4a8fb1a1 | 798 | tree list) |
12670d88 | 799 | { |
52a11cbf RH |
800 | struct ttypes_filter **slot, *n; |
801 | struct ttypes_filter dummy; | |
12670d88 | 802 | |
52a11cbf | 803 | dummy.t = list; |
c203e8a7 | 804 | slot = ehspec_hash->find_slot (&dummy, INSERT); |
52a11cbf RH |
805 | |
806 | if ((n = *slot) == NULL) | |
807 | { | |
1d65f45c RH |
808 | int len; |
809 | ||
810 | if (targetm.arm_eabi_unwinder) | |
9771b263 | 811 | len = vec_safe_length (cfun->eh->ehspec_data.arm_eabi); |
1d65f45c | 812 | else |
9771b263 | 813 | len = vec_safe_length (cfun->eh->ehspec_data.other); |
1d65f45c | 814 | |
52a11cbf RH |
815 | /* Filter value is a -1 based byte index into a uleb128 buffer. */ |
816 | ||
5ed6ace5 | 817 | n = XNEW (struct ttypes_filter); |
52a11cbf | 818 | n->t = list; |
1d65f45c | 819 | n->filter = -(len + 1); |
52a11cbf RH |
820 | *slot = n; |
821 | ||
617a1b71 | 822 | /* Generate a 0 terminated list of filter values. */ |
52a11cbf | 823 | for (; list ; list = TREE_CHAIN (list)) |
617a1b71 PB |
824 | { |
825 | if (targetm.arm_eabi_unwinder) | |
9771b263 | 826 | vec_safe_push (cfun->eh->ehspec_data.arm_eabi, TREE_VALUE (list)); |
617a1b71 PB |
827 | else |
828 | { | |
829 | /* Look up each type in the list and encode its filter | |
830 | value as a uleb128. */ | |
1d65f45c RH |
831 | push_uleb128 (&cfun->eh->ehspec_data.other, |
832 | add_ttypes_entry (ttypes_hash, TREE_VALUE (list))); | |
6d41a92f | 833 | } |
52a11cbf | 834 | } |
1d65f45c | 835 | if (targetm.arm_eabi_unwinder) |
9771b263 | 836 | vec_safe_push (cfun->eh->ehspec_data.arm_eabi, NULL_TREE); |
1d65f45c | 837 | else |
9771b263 | 838 | vec_safe_push (cfun->eh->ehspec_data.other, (uchar)0); |
52a11cbf | 839 | } |
1d65f45c RH |
840 | |
841 | return n->filter; | |
52a11cbf | 842 | } |
1e4ceb6f | 843 | |
1d65f45c RH |
844 | /* Generate the action filter values to be used for CATCH and |
845 | ALLOWED_EXCEPTIONS regions. When using dwarf2 exception regions, | |
846 | we use lots of landing pads, and so every type or list can share | |
847 | the same filter value, which saves table space. */ | |
47c84870 | 848 | |
1d65f45c RH |
849 | void |
850 | assign_filter_values (void) | |
1e4ceb6f | 851 | { |
52a11cbf | 852 | int i; |
1d65f45c RH |
853 | eh_region r; |
854 | eh_catch c; | |
76fc91c7 | 855 | |
9771b263 | 856 | vec_alloc (cfun->eh->ttype_data, 16); |
1d65f45c | 857 | if (targetm.arm_eabi_unwinder) |
9771b263 | 858 | vec_alloc (cfun->eh->ehspec_data.arm_eabi, 64); |
1d65f45c | 859 | else |
9771b263 | 860 | vec_alloc (cfun->eh->ehspec_data.other, 64); |
1e4ceb6f | 861 | |
c203e8a7 TS |
862 | ehspec_hash_type ehspec (31); |
863 | ttypes_hash_type ttypes (31); | |
1e4ceb6f | 864 | |
9771b263 | 865 | for (i = 1; vec_safe_iterate (cfun->eh->region_array, i, &r); ++i) |
1d65f45c RH |
866 | { |
867 | if (r == NULL) | |
52a11cbf | 868 | continue; |
76fc91c7 | 869 | |
1d65f45c | 870 | switch (r->type) |
12c3874e | 871 | { |
1d65f45c RH |
872 | case ERT_TRY: |
873 | for (c = r->u.eh_try.first_catch; c ; c = c->next_catch) | |
f645e9a2 | 874 | { |
1d65f45c RH |
875 | /* Whatever type_list is (NULL or true list), we build a list |
876 | of filters for the region. */ | |
877 | c->filter_list = NULL_TREE; | |
878 | ||
879 | if (c->type_list != NULL) | |
880 | { | |
881 | /* Get a filter value for each of the types caught and store | |
882 | them in the region's dedicated list. */ | |
883 | tree tp_node = c->type_list; | |
884 | ||
885 | for ( ; tp_node; tp_node = TREE_CHAIN (tp_node)) | |
886 | { | |
c203e8a7 TS |
887 | int flt |
888 | = add_ttypes_entry (&ttypes, TREE_VALUE (tp_node)); | |
45a2c477 | 889 | tree flt_node = build_int_cst (integer_type_node, flt); |
1d65f45c RH |
890 | |
891 | c->filter_list | |
892 | = tree_cons (NULL_TREE, flt_node, c->filter_list); | |
893 | } | |
894 | } | |
895 | else | |
896 | { | |
897 | /* Get a filter value for the NULL list also since it | |
898 | will need an action record anyway. */ | |
c203e8a7 | 899 | int flt = add_ttypes_entry (&ttypes, NULL); |
45a2c477 | 900 | tree flt_node = build_int_cst (integer_type_node, flt); |
1d65f45c RH |
901 | |
902 | c->filter_list | |
903 | = tree_cons (NULL_TREE, flt_node, NULL); | |
904 | } | |
f645e9a2 | 905 | } |
1d65f45c | 906 | break; |
f645e9a2 | 907 | |
1d65f45c RH |
908 | case ERT_ALLOWED_EXCEPTIONS: |
909 | r->u.allowed.filter | |
c203e8a7 | 910 | = add_ehspec_entry (&ehspec, &ttypes, r->u.allowed.type_list); |
1d65f45c | 911 | break; |
6de9cd9a | 912 | |
1d65f45c RH |
913 | default: |
914 | break; | |
915 | } | |
52a11cbf RH |
916 | } |
917 | } | |
918 | ||
1d65f45c RH |
919 | /* Emit SEQ into basic block just before INSN (that is assumed to be |
920 | first instruction of some existing BB and return the newly | |
921 | produced block. */ | |
922 | static basic_block | |
9b2ea071 | 923 | emit_to_new_bb_before (rtx_insn *seq, rtx_insn *insn) |
1d65f45c | 924 | { |
4500f751 | 925 | rtx_insn *next, *last; |
8a829274 | 926 | basic_block bb; |
1d65f45c RH |
927 | edge e; |
928 | edge_iterator ei; | |
929 | ||
930 | /* If there happens to be a fallthru edge (possibly created by cleanup_cfg | |
931 | call), we don't want it to go into newly created landing pad or other EH | |
932 | construct. */ | |
933 | for (ei = ei_start (BLOCK_FOR_INSN (insn)->preds); (e = ei_safe_edge (ei)); ) | |
934 | if (e->flags & EDGE_FALLTHRU) | |
935 | force_nonfallthru (e); | |
936 | else | |
937 | ei_next (&ei); | |
4500f751 EB |
938 | |
939 | /* Make sure to put the location of INSN or a subsequent instruction on SEQ | |
940 | to avoid inheriting the location of the previous instruction. */ | |
941 | next = insn; | |
942 | while (next && !NONDEBUG_INSN_P (next)) | |
943 | next = NEXT_INSN (next); | |
944 | if (next) | |
945 | last = emit_insn_before_setloc (seq, insn, INSN_LOCATION (next)); | |
946 | else | |
947 | last = emit_insn_before (seq, insn); | |
1d65f45c RH |
948 | if (BARRIER_P (last)) |
949 | last = PREV_INSN (last); | |
8a829274 | 950 | bb = create_basic_block (seq, last, BLOCK_FOR_INSN (insn)->prev_bb); |
1d65f45c RH |
951 | update_bb_for_insn (bb); |
952 | bb->flags |= BB_SUPERBLOCK; | |
953 | return bb; | |
954 | } | |
52a11cbf | 955 | \f |
0be7e7a6 RH |
956 | /* A subroutine of dw2_build_landing_pads, also used for edge splitting |
957 | at the rtl level. Emit the code required by the target at a landing | |
958 | pad for the given region. */ | |
959 | ||
465d0087 | 960 | static void |
0be7e7a6 RH |
961 | expand_dw2_landing_pad_for_region (eh_region region) |
962 | { | |
95a3fb9d RS |
963 | if (targetm.have_exception_receiver ()) |
964 | emit_insn (targetm.gen_exception_receiver ()); | |
965 | else if (targetm.have_nonlocal_goto_receiver ()) | |
966 | emit_insn (targetm.gen_nonlocal_goto_receiver ()); | |
0be7e7a6 | 967 | else |
0be7e7a6 RH |
968 | { /* Nothing */ } |
969 | ||
970 | if (region->exc_ptr_reg) | |
971 | emit_move_insn (region->exc_ptr_reg, | |
972 | gen_rtx_REG (ptr_mode, EH_RETURN_DATA_REGNO (0))); | |
973 | if (region->filter_reg) | |
974 | emit_move_insn (region->filter_reg, | |
975 | gen_rtx_REG (targetm.eh_return_filter_mode (), | |
976 | EH_RETURN_DATA_REGNO (1))); | |
977 | } | |
978 | ||
1d65f45c RH |
979 | /* Expand the extra code needed at landing pads for dwarf2 unwinding. */ |
980 | ||
52a11cbf | 981 | static void |
502b8322 | 982 | dw2_build_landing_pads (void) |
4956d07c | 983 | { |
ae0ed63a | 984 | int i; |
1d65f45c | 985 | eh_landing_pad lp; |
0be7e7a6 RH |
986 | int e_flags = EDGE_FALLTHRU; |
987 | ||
988 | /* If we're going to partition blocks, we need to be able to add | |
989 | new landing pads later, which means that we need to hold on to | |
990 | the post-landing-pad block. Prevent it from being merged away. | |
991 | We'll remove this bit after partitioning. */ | |
992 | if (flag_reorder_blocks_and_partition) | |
993 | e_flags |= EDGE_PRESERVE; | |
4956d07c | 994 | |
9771b263 | 995 | for (i = 1; vec_safe_iterate (cfun->eh->lp_array, i, &lp); ++i) |
52a11cbf | 996 | { |
12c3874e | 997 | basic_block bb; |
f8b23302 | 998 | rtx_insn *seq; |
4956d07c | 999 | |
1d65f45c | 1000 | if (lp == NULL || lp->post_landing_pad == NULL) |
a3710436 JH |
1001 | continue; |
1002 | ||
52a11cbf | 1003 | start_sequence (); |
4956d07c | 1004 | |
1d65f45c RH |
1005 | lp->landing_pad = gen_label_rtx (); |
1006 | emit_label (lp->landing_pad); | |
c40b5400 | 1007 | LABEL_PRESERVE_P (lp->landing_pad) = 1; |
4956d07c | 1008 | |
0be7e7a6 | 1009 | expand_dw2_landing_pad_for_region (lp->region); |
9a0d1e1b | 1010 | |
52a11cbf RH |
1011 | seq = get_insns (); |
1012 | end_sequence (); | |
5816cb14 | 1013 | |
1d65f45c | 1014 | bb = emit_to_new_bb_before (seq, label_rtx (lp->post_landing_pad)); |
57a5a8b3 | 1015 | bb->count = bb->next_bb->count; |
357067f2 | 1016 | make_single_succ_edge (bb, bb->next_bb, e_flags); |
0b7fccfa RG |
1017 | if (current_loops) |
1018 | { | |
99b1c316 | 1019 | class loop *loop = bb->next_bb->loop_father; |
0b7fccfa RG |
1020 | /* If we created a pre-header block, add the new block to the |
1021 | outer loop, otherwise to the loop itself. */ | |
1022 | if (bb->next_bb == loop->header) | |
1023 | add_bb_to_loop (bb, loop_outer (loop)); | |
1024 | else | |
1025 | add_bb_to_loop (bb, loop); | |
1026 | } | |
52a11cbf | 1027 | } |
4956d07c MS |
1028 | } |
1029 | ||
52a11cbf | 1030 | \f |
9771b263 | 1031 | static vec<int> sjlj_lp_call_site_index; |
12670d88 | 1032 | |
1d65f45c RH |
1033 | /* Process all active landing pads. Assign each one a compact dispatch |
1034 | index, and a call-site index. */ | |
e701eb4d | 1035 | |
1d65f45c RH |
1036 | static int |
1037 | sjlj_assign_call_site_values (void) | |
e701eb4d | 1038 | { |
c203e8a7 | 1039 | action_hash_type ar_hash (31); |
1d65f45c RH |
1040 | int i, disp_index; |
1041 | eh_landing_pad lp; | |
52a11cbf | 1042 | |
9771b263 | 1043 | vec_alloc (crtl->eh.action_record_data, 64); |
52a11cbf | 1044 | |
1d65f45c RH |
1045 | disp_index = 0; |
1046 | call_site_base = 1; | |
9771b263 | 1047 | for (i = 1; vec_safe_iterate (cfun->eh->lp_array, i, &lp); ++i) |
1d65f45c | 1048 | if (lp && lp->post_landing_pad) |
e6cfb550 | 1049 | { |
1d65f45c | 1050 | int action, call_site; |
0856ee98 | 1051 | |
1d65f45c | 1052 | /* First: build the action table. */ |
c203e8a7 | 1053 | action = collect_one_action_chain (&ar_hash, lp->region); |
52a11cbf | 1054 | |
1d65f45c RH |
1055 | /* Next: assign call-site values. If dwarf2 terms, this would be |
1056 | the region number assigned by convert_to_eh_region_ranges, but | |
1057 | handles no-action and must-not-throw differently. */ | |
52a11cbf RH |
1058 | /* Map must-not-throw to otherwise unused call-site index 0. */ |
1059 | if (action == -2) | |
1d65f45c | 1060 | call_site = 0; |
52a11cbf RH |
1061 | /* Map no-action to otherwise unused call-site index -1. */ |
1062 | else if (action == -1) | |
1d65f45c | 1063 | call_site = -1; |
52a11cbf RH |
1064 | /* Otherwise, look it up in the table. */ |
1065 | else | |
1d65f45c | 1066 | call_site = add_call_site (GEN_INT (disp_index), action, 0); |
9771b263 | 1067 | sjlj_lp_call_site_index[i] = call_site; |
52a11cbf | 1068 | |
1d65f45c | 1069 | disp_index++; |
52a11cbf | 1070 | } |
1d65f45c | 1071 | |
1d65f45c | 1072 | return disp_index; |
4956d07c | 1073 | } |
27a36778 | 1074 | |
1d65f45c RH |
1075 | /* Emit code to record the current call-site index before every |
1076 | insn that can throw. */ | |
1077 | ||
52a11cbf | 1078 | static void |
1d65f45c | 1079 | sjlj_mark_call_sites (void) |
27a36778 | 1080 | { |
52a11cbf | 1081 | int last_call_site = -2; |
f8b23302 DM |
1082 | rtx_insn *insn; |
1083 | rtx mem; | |
52a11cbf | 1084 | |
52a11cbf | 1085 | for (insn = get_insns (); insn ; insn = NEXT_INSN (insn)) |
27a36778 | 1086 | { |
1d65f45c RH |
1087 | eh_landing_pad lp; |
1088 | eh_region r; | |
1089 | bool nothrow; | |
52a11cbf | 1090 | int this_call_site; |
f8b23302 | 1091 | rtx_insn *before, *p; |
27a36778 | 1092 | |
52a11cbf | 1093 | /* Reset value tracking at extended basic block boundaries. */ |
4b4bf941 | 1094 | if (LABEL_P (insn)) |
52a11cbf | 1095 | last_call_site = -2; |
27a36778 | 1096 | |
d33606c3 EB |
1097 | /* If the function allocates dynamic stack space, the context must |
1098 | be updated after every allocation/deallocation accordingly. */ | |
1099 | if (NOTE_P (insn) && NOTE_KIND (insn) == NOTE_INSN_UPDATE_SJLJ_CONTEXT) | |
1100 | { | |
1101 | rtx buf_addr; | |
1102 | ||
1103 | start_sequence (); | |
1104 | buf_addr = plus_constant (Pmode, XEXP (crtl->eh.sjlj_fc, 0), | |
1105 | sjlj_fc_jbuf_ofs); | |
1106 | expand_builtin_update_setjmp_buf (buf_addr); | |
1107 | p = get_insns (); | |
1108 | end_sequence (); | |
1109 | emit_insn_before (p, insn); | |
1110 | } | |
1111 | ||
52a11cbf RH |
1112 | if (! INSN_P (insn)) |
1113 | continue; | |
27a36778 | 1114 | |
1d65f45c RH |
1115 | nothrow = get_eh_region_and_lp_from_rtx (insn, &r, &lp); |
1116 | if (nothrow) | |
12633413 | 1117 | continue; |
1d65f45c | 1118 | if (lp) |
9771b263 | 1119 | this_call_site = sjlj_lp_call_site_index[lp->index]; |
1d65f45c | 1120 | else if (r == NULL) |
52a11cbf RH |
1121 | { |
1122 | /* Calls (and trapping insns) without notes are outside any | |
1123 | exception handling region in this function. Mark them as | |
1124 | no action. */ | |
1d65f45c | 1125 | this_call_site = -1; |
52a11cbf RH |
1126 | } |
1127 | else | |
1d65f45c RH |
1128 | { |
1129 | gcc_assert (r->type == ERT_MUST_NOT_THROW); | |
1130 | this_call_site = 0; | |
1131 | } | |
27a36778 | 1132 | |
0cecee06 UW |
1133 | if (this_call_site != -1) |
1134 | crtl->uses_eh_lsda = 1; | |
1135 | ||
52a11cbf RH |
1136 | if (this_call_site == last_call_site) |
1137 | continue; | |
1138 | ||
1139 | /* Don't separate a call from it's argument loads. */ | |
1140 | before = insn; | |
4b4bf941 | 1141 | if (CALL_P (insn)) |
9321cf00 | 1142 | before = find_first_parameter_load (insn, NULL); |
4956d07c | 1143 | |
52a11cbf | 1144 | start_sequence (); |
69c32ec8 | 1145 | mem = adjust_address (crtl->eh.sjlj_fc, TYPE_MODE (integer_type_node), |
fd2c57a9 | 1146 | sjlj_fc_call_site_ofs); |
69db2d57 | 1147 | emit_move_insn (mem, gen_int_mode (this_call_site, GET_MODE (mem))); |
52a11cbf RH |
1148 | p = get_insns (); |
1149 | end_sequence (); | |
12670d88 | 1150 | |
2f937369 | 1151 | emit_insn_before (p, before); |
52a11cbf RH |
1152 | last_call_site = this_call_site; |
1153 | } | |
1154 | } | |
4956d07c | 1155 | |
52a11cbf RH |
1156 | /* Construct the SjLj_Function_Context. */ |
1157 | ||
1158 | static void | |
f8b23302 | 1159 | sjlj_emit_function_enter (rtx_code_label *dispatch_label) |
4956d07c | 1160 | { |
f8b23302 DM |
1161 | rtx_insn *fn_begin, *seq; |
1162 | rtx fc, mem; | |
fc781ee0 | 1163 | bool fn_begin_outside_block; |
f9417da1 | 1164 | rtx personality = get_personality_function (current_function_decl); |
4956d07c | 1165 | |
69c32ec8 | 1166 | fc = crtl->eh.sjlj_fc; |
4956d07c | 1167 | |
52a11cbf | 1168 | start_sequence (); |
8a4451aa | 1169 | |
8979edec JL |
1170 | /* We're storing this libcall's address into memory instead of |
1171 | calling it directly. Thus, we must call assemble_external_libcall | |
67914693 | 1172 | here, as we cannot depend on emit_library_call to do it for us. */ |
f9417da1 | 1173 | assemble_external_libcall (personality); |
f4ef873c | 1174 | mem = adjust_address (fc, Pmode, sjlj_fc_personality_ofs); |
f9417da1 | 1175 | emit_move_insn (mem, personality); |
52a11cbf | 1176 | |
f4ef873c | 1177 | mem = adjust_address (fc, Pmode, sjlj_fc_lsda_ofs); |
e3b5732b | 1178 | if (crtl->uses_eh_lsda) |
52a11cbf RH |
1179 | { |
1180 | char buf[20]; | |
86bdf071 RE |
1181 | rtx sym; |
1182 | ||
df696a75 | 1183 | ASM_GENERATE_INTERNAL_LABEL (buf, "LLSDA", current_function_funcdef_no); |
86bdf071 RE |
1184 | sym = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (buf)); |
1185 | SYMBOL_REF_FLAGS (sym) = SYMBOL_FLAG_LOCAL; | |
1186 | emit_move_insn (mem, sym); | |
8a4451aa | 1187 | } |
52a11cbf RH |
1188 | else |
1189 | emit_move_insn (mem, const0_rtx); | |
3f2c5d1a | 1190 | |
0cecee06 UW |
1191 | if (dispatch_label) |
1192 | { | |
ee516de9 EB |
1193 | rtx addr = plus_constant (Pmode, XEXP (fc, 0), sjlj_fc_jbuf_ofs); |
1194 | ||
52a11cbf | 1195 | #ifdef DONT_USE_BUILTIN_SETJMP |
ee516de9 EB |
1196 | addr = copy_addr_to_reg (addr); |
1197 | addr = convert_memory_address (ptr_mode, addr); | |
1198 | tree addr_tree = make_tree (ptr_type_node, addr); | |
1199 | ||
2ab71f3d | 1200 | tree call_expr = build_call_expr (setjmp_fn, 1, addr_tree); |
ee516de9 | 1201 | rtx x = expand_call (call_expr, NULL_RTX, false); |
0cecee06 UW |
1202 | |
1203 | emit_cmp_and_jump_insns (x, const0_rtx, NE, 0, | |
1204 | TYPE_MODE (integer_type_node), 0, | |
84a1b7fe JH |
1205 | dispatch_label, |
1206 | profile_probability::unlikely ()); | |
0cecee06 | 1207 | #else |
ee516de9 | 1208 | expand_builtin_setjmp_setup (addr, dispatch_label); |
4956d07c | 1209 | #endif |
0cecee06 | 1210 | } |
4956d07c | 1211 | |
52a11cbf | 1212 | emit_library_call (unwind_sjlj_register_libfunc, LCT_NORMAL, VOIDmode, |
db69559b | 1213 | XEXP (fc, 0), Pmode); |
12670d88 | 1214 | |
52a11cbf RH |
1215 | seq = get_insns (); |
1216 | end_sequence (); | |
4956d07c | 1217 | |
52a11cbf RH |
1218 | /* ??? Instead of doing this at the beginning of the function, |
1219 | do this in a block that is at loop level 0 and dominates all | |
1220 | can_throw_internal instructions. */ | |
4956d07c | 1221 | |
fc781ee0 | 1222 | fn_begin_outside_block = true; |
52a11cbf | 1223 | for (fn_begin = get_insns (); ; fn_begin = NEXT_INSN (fn_begin)) |
fc781ee0 AM |
1224 | if (NOTE_P (fn_begin)) |
1225 | { | |
a38e7aa5 | 1226 | if (NOTE_KIND (fn_begin) == NOTE_INSN_FUNCTION_BEG) |
fc781ee0 | 1227 | break; |
a38e7aa5 | 1228 | else if (NOTE_INSN_BASIC_BLOCK_P (fn_begin)) |
fc781ee0 AM |
1229 | fn_begin_outside_block = false; |
1230 | } | |
1231 | ||
06fc54dd EB |
1232 | #ifdef DONT_USE_BUILTIN_SETJMP |
1233 | if (dispatch_label) | |
1234 | { | |
1235 | /* The sequence contains a branch in the middle so we need to force | |
1236 | the creation of a new basic block by means of BB_SUPERBLOCK. */ | |
1237 | if (fn_begin_outside_block) | |
1238 | { | |
1239 | basic_block bb | |
1240 | = split_edge (single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun))); | |
1241 | if (JUMP_P (BB_END (bb))) | |
1242 | emit_insn_before (seq, BB_END (bb)); | |
1243 | else | |
1244 | emit_insn_after (seq, BB_END (bb)); | |
1245 | } | |
1246 | else | |
1247 | emit_insn_after (seq, fn_begin); | |
1248 | ||
1249 | single_succ (ENTRY_BLOCK_PTR_FOR_FN (cfun))->flags |= BB_SUPERBLOCK; | |
1250 | return; | |
1251 | } | |
1252 | #endif | |
1253 | ||
fc781ee0 | 1254 | if (fn_begin_outside_block) |
fefa31b5 | 1255 | insert_insn_on_edge (seq, single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun))); |
12c3874e | 1256 | else |
fc781ee0 | 1257 | emit_insn_after (seq, fn_begin); |
4956d07c MS |
1258 | } |
1259 | ||
52a11cbf RH |
1260 | /* Call back from expand_function_end to know where we should put |
1261 | the call to unwind_sjlj_unregister_libfunc if needed. */ | |
12670d88 | 1262 | |
52a11cbf | 1263 | void |
f8b23302 | 1264 | sjlj_emit_function_exit_after (rtx_insn *after) |
52a11cbf | 1265 | { |
69c32ec8 | 1266 | crtl->eh.sjlj_exit_after = after; |
52a11cbf | 1267 | } |
4956d07c MS |
1268 | |
1269 | static void | |
502b8322 | 1270 | sjlj_emit_function_exit (void) |
52a11cbf | 1271 | { |
f8b23302 | 1272 | rtx_insn *seq, *insn; |
4956d07c | 1273 | |
52a11cbf | 1274 | start_sequence (); |
ce152ef8 | 1275 | |
52a11cbf | 1276 | emit_library_call (unwind_sjlj_unregister_libfunc, LCT_NORMAL, VOIDmode, |
db69559b | 1277 | XEXP (crtl->eh.sjlj_fc, 0), Pmode); |
e6cfb550 | 1278 | |
52a11cbf RH |
1279 | seq = get_insns (); |
1280 | end_sequence (); | |
4956d07c | 1281 | |
52a11cbf RH |
1282 | /* ??? Really this can be done in any block at loop level 0 that |
1283 | post-dominates all can_throw_internal instructions. This is | |
1284 | the last possible moment. */ | |
9a0d1e1b | 1285 | |
4c33221c UW |
1286 | insn = crtl->eh.sjlj_exit_after; |
1287 | if (LABEL_P (insn)) | |
1288 | insn = NEXT_INSN (insn); | |
12c3874e | 1289 | |
4c33221c | 1290 | emit_insn_after (seq, insn); |
9a0d1e1b AM |
1291 | } |
1292 | ||
52a11cbf | 1293 | static void |
be7457df | 1294 | sjlj_emit_dispatch_table (rtx_code_label *dispatch_label, int num_dispatch) |
ce152ef8 | 1295 | { |
095a2d76 RS |
1296 | scalar_int_mode unwind_word_mode = targetm.unwind_word_mode (); |
1297 | scalar_int_mode filter_mode = targetm.eh_return_filter_mode (); | |
1d65f45c | 1298 | eh_landing_pad lp; |
e67d1102 | 1299 | rtx mem, fc, exc_ptr_reg, filter_reg; |
f8b23302 | 1300 | rtx_insn *seq; |
12c3874e | 1301 | basic_block bb; |
1d65f45c | 1302 | eh_region r; |
1d65f45c | 1303 | int i, disp_index; |
6e1aa848 | 1304 | vec<tree> dispatch_labels = vNULL; |
52a11cbf | 1305 | |
69c32ec8 | 1306 | fc = crtl->eh.sjlj_fc; |
52a11cbf RH |
1307 | |
1308 | start_sequence (); | |
1309 | ||
1310 | emit_label (dispatch_label); | |
3f2c5d1a | 1311 | |
52a11cbf RH |
1312 | #ifndef DONT_USE_BUILTIN_SETJMP |
1313 | expand_builtin_setjmp_receiver (dispatch_label); | |
52a11cbf | 1314 | |
1d65f45c RH |
1315 | /* The caller of expand_builtin_setjmp_receiver is responsible for |
1316 | making sure that the label doesn't vanish. The only other caller | |
1317 | is the expander for __builtin_setjmp_receiver, which places this | |
1318 | label on the nonlocal_goto_label list. Since we're modeling these | |
1319 | CFG edges more exactly, we can use the forced_labels list instead. */ | |
1320 | LABEL_PRESERVE_P (dispatch_label) = 1; | |
6f7eba34 | 1321 | vec_safe_push<rtx_insn *> (forced_labels, dispatch_label); |
1d65f45c | 1322 | #endif |
52a11cbf | 1323 | |
1d65f45c | 1324 | /* Load up exc_ptr and filter values from the function context. */ |
7b0518e3 UW |
1325 | mem = adjust_address (fc, unwind_word_mode, sjlj_fc_data_ofs); |
1326 | if (unwind_word_mode != ptr_mode) | |
52a11cbf RH |
1327 | { |
1328 | #ifdef POINTERS_EXTEND_UNSIGNED | |
f920765d | 1329 | mem = convert_memory_address (ptr_mode, mem); |
52a11cbf | 1330 | #else |
f920765d | 1331 | mem = convert_to_mode (ptr_mode, mem, 0); |
52a11cbf RH |
1332 | #endif |
1333 | } | |
1d65f45c | 1334 | exc_ptr_reg = force_reg (ptr_mode, mem); |
52a11cbf | 1335 | |
7b0518e3 UW |
1336 | mem = adjust_address (fc, unwind_word_mode, |
1337 | sjlj_fc_data_ofs + GET_MODE_SIZE (unwind_word_mode)); | |
1338 | if (unwind_word_mode != filter_mode) | |
1339 | mem = convert_to_mode (filter_mode, mem, 0); | |
1d65f45c | 1340 | filter_reg = force_reg (filter_mode, mem); |
4956d07c | 1341 | |
52a11cbf | 1342 | /* Jump to one of the directly reachable regions. */ |
52a11cbf | 1343 | |
1d65f45c | 1344 | disp_index = 0; |
e67d1102 | 1345 | rtx_code_label *first_reachable_label = NULL; |
1d65f45c RH |
1346 | |
1347 | /* If there's exactly one call site in the function, don't bother | |
1348 | generating a switch statement. */ | |
1d65f45c | 1349 | if (num_dispatch > 1) |
9771b263 | 1350 | dispatch_labels.create (num_dispatch); |
1d65f45c | 1351 | |
9771b263 | 1352 | for (i = 1; vec_safe_iterate (cfun->eh->lp_array, i, &lp); ++i) |
1d65f45c RH |
1353 | if (lp && lp->post_landing_pad) |
1354 | { | |
f8b23302 | 1355 | rtx_insn *seq2; |
1476d1bd | 1356 | rtx_code_label *label; |
1d65f45c RH |
1357 | |
1358 | start_sequence (); | |
1359 | ||
1360 | lp->landing_pad = dispatch_label; | |
1361 | ||
1362 | if (num_dispatch > 1) | |
1363 | { | |
3d528853 | 1364 | tree t_label, case_elt, t; |
1d65f45c RH |
1365 | |
1366 | t_label = create_artificial_label (UNKNOWN_LOCATION); | |
3d528853 NF |
1367 | t = build_int_cst (integer_type_node, disp_index); |
1368 | case_elt = build_case_label (t, NULL, t_label); | |
9771b263 | 1369 | dispatch_labels.quick_push (case_elt); |
1476d1bd | 1370 | label = jump_target_rtx (t_label); |
1d65f45c RH |
1371 | } |
1372 | else | |
1373 | label = gen_label_rtx (); | |
1374 | ||
1375 | if (disp_index == 0) | |
1376 | first_reachable_label = label; | |
1377 | emit_label (label); | |
1378 | ||
1379 | r = lp->region; | |
1380 | if (r->exc_ptr_reg) | |
1381 | emit_move_insn (r->exc_ptr_reg, exc_ptr_reg); | |
1382 | if (r->filter_reg) | |
1383 | emit_move_insn (r->filter_reg, filter_reg); | |
1384 | ||
1385 | seq2 = get_insns (); | |
1386 | end_sequence (); | |
1387 | ||
e67d1102 | 1388 | rtx_insn *before = label_rtx (lp->post_landing_pad); |
1d65f45c | 1389 | bb = emit_to_new_bb_before (seq2, before); |
357067f2 | 1390 | make_single_succ_edge (bb, bb->next_bb, EDGE_FALLTHRU); |
405af656 RG |
1391 | if (current_loops) |
1392 | { | |
99b1c316 | 1393 | class loop *loop = bb->next_bb->loop_father; |
405af656 RG |
1394 | /* If we created a pre-header block, add the new block to the |
1395 | outer loop, otherwise to the loop itself. */ | |
1396 | if (bb->next_bb == loop->header) | |
1397 | add_bb_to_loop (bb, loop_outer (loop)); | |
1398 | else | |
1399 | add_bb_to_loop (bb, loop); | |
1400 | /* ??? For multiple dispatches we will end up with edges | |
1401 | from the loop tree root into this loop, making it a | |
1402 | multiple-entry loop. Discard all affected loops. */ | |
1403 | if (num_dispatch > 1) | |
1404 | { | |
1405 | for (loop = bb->loop_father; | |
1406 | loop_outer (loop); loop = loop_outer (loop)) | |
08c13199 | 1407 | mark_loop_for_removal (loop); |
405af656 RG |
1408 | } |
1409 | } | |
e6cfb550 | 1410 | |
1d65f45c RH |
1411 | disp_index++; |
1412 | } | |
1413 | gcc_assert (disp_index == num_dispatch); | |
1414 | ||
1415 | if (num_dispatch > 1) | |
1416 | { | |
fd8d363e SB |
1417 | rtx disp = adjust_address (fc, TYPE_MODE (integer_type_node), |
1418 | sjlj_fc_call_site_ofs); | |
9a1b6b7a | 1419 | expand_sjlj_dispatch_table (disp, dispatch_labels); |
a1622f83 | 1420 | } |
9a0d1e1b | 1421 | |
52a11cbf RH |
1422 | seq = get_insns (); |
1423 | end_sequence (); | |
4956d07c | 1424 | |
1d65f45c RH |
1425 | bb = emit_to_new_bb_before (seq, first_reachable_label); |
1426 | if (num_dispatch == 1) | |
1427 | { | |
357067f2 | 1428 | make_single_succ_edge (bb, bb->next_bb, EDGE_FALLTHRU); |
405af656 RG |
1429 | if (current_loops) |
1430 | { | |
99b1c316 | 1431 | class loop *loop = bb->next_bb->loop_father; |
405af656 RG |
1432 | /* If we created a pre-header block, add the new block to the |
1433 | outer loop, otherwise to the loop itself. */ | |
1434 | if (bb->next_bb == loop->header) | |
1435 | add_bb_to_loop (bb, loop_outer (loop)); | |
1436 | else | |
1437 | add_bb_to_loop (bb, loop); | |
1438 | } | |
1439 | } | |
1440 | else | |
1441 | { | |
1442 | /* We are not wiring up edges here, but as the dispatcher call | |
1443 | is at function begin simply associate the block with the | |
1444 | outermost (non-)loop. */ | |
1445 | if (current_loops) | |
1446 | add_bb_to_loop (bb, current_loops->tree_root); | |
1d65f45c | 1447 | } |
ce152ef8 AM |
1448 | } |
1449 | ||
52a11cbf | 1450 | static void |
502b8322 | 1451 | sjlj_build_landing_pads (void) |
ce152ef8 | 1452 | { |
1d65f45c | 1453 | int num_dispatch; |
ce152ef8 | 1454 | |
9771b263 | 1455 | num_dispatch = vec_safe_length (cfun->eh->lp_array); |
1d65f45c RH |
1456 | if (num_dispatch == 0) |
1457 | return; | |
cb3874dc | 1458 | sjlj_lp_call_site_index.safe_grow_cleared (num_dispatch, true); |
ce152ef8 | 1459 | |
1d65f45c RH |
1460 | num_dispatch = sjlj_assign_call_site_values (); |
1461 | if (num_dispatch > 0) | |
52a11cbf | 1462 | { |
f8b23302 | 1463 | rtx_code_label *dispatch_label = gen_label_rtx (); |
3a695389 UW |
1464 | int align = STACK_SLOT_ALIGNMENT (sjlj_fc_type_node, |
1465 | TYPE_MODE (sjlj_fc_type_node), | |
1466 | TYPE_ALIGN (sjlj_fc_type_node)); | |
69c32ec8 | 1467 | crtl->eh.sjlj_fc |
52a11cbf RH |
1468 | = assign_stack_local (TYPE_MODE (sjlj_fc_type_node), |
1469 | int_size_in_bytes (sjlj_fc_type_node), | |
3a695389 | 1470 | align); |
4956d07c | 1471 | |
1d65f45c | 1472 | sjlj_mark_call_sites (); |
52a11cbf | 1473 | sjlj_emit_function_enter (dispatch_label); |
1d65f45c | 1474 | sjlj_emit_dispatch_table (dispatch_label, num_dispatch); |
52a11cbf RH |
1475 | sjlj_emit_function_exit (); |
1476 | } | |
a1622f83 | 1477 | |
0cecee06 UW |
1478 | /* If we do not have any landing pads, we may still need to register a |
1479 | personality routine and (empty) LSDA to handle must-not-throw regions. */ | |
1480 | else if (function_needs_eh_personality (cfun) != eh_personality_none) | |
1481 | { | |
1482 | int align = STACK_SLOT_ALIGNMENT (sjlj_fc_type_node, | |
1483 | TYPE_MODE (sjlj_fc_type_node), | |
1484 | TYPE_ALIGN (sjlj_fc_type_node)); | |
1485 | crtl->eh.sjlj_fc | |
1486 | = assign_stack_local (TYPE_MODE (sjlj_fc_type_node), | |
1487 | int_size_in_bytes (sjlj_fc_type_node), | |
1488 | align); | |
1489 | ||
1490 | sjlj_mark_call_sites (); | |
f8b23302 | 1491 | sjlj_emit_function_enter (NULL); |
0cecee06 UW |
1492 | sjlj_emit_function_exit (); |
1493 | } | |
1494 | ||
9771b263 | 1495 | sjlj_lp_call_site_index.release (); |
4956d07c | 1496 | } |
ce152ef8 | 1497 | |
d33606c3 EB |
1498 | /* Update the sjlj function context. This function should be called |
1499 | whenever we allocate or deallocate dynamic stack space. */ | |
1500 | ||
1501 | void | |
1502 | update_sjlj_context (void) | |
1503 | { | |
1504 | if (!flag_exceptions) | |
1505 | return; | |
1506 | ||
1507 | emit_note (NOTE_INSN_UPDATE_SJLJ_CONTEXT); | |
1508 | } | |
1509 | ||
3cabd6d1 LB |
1510 | /* After initial rtl generation, call back to finish generating |
1511 | exception support code. */ | |
1512 | ||
dac1fbf8 | 1513 | void |
502b8322 | 1514 | finish_eh_generation (void) |
ce152ef8 | 1515 | { |
12c3874e JH |
1516 | basic_block bb; |
1517 | ||
52a11cbf | 1518 | /* Construct the landing pads. */ |
677f3fa8 | 1519 | if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ) |
52a11cbf RH |
1520 | sjlj_build_landing_pads (); |
1521 | else | |
1522 | dw2_build_landing_pads (); | |
1d65f45c | 1523 | |
56b97603 | 1524 | break_superblocks (); |
1d65f45c RH |
1525 | |
1526 | /* Redirect all EH edges from the post_landing_pad to the landing pad. */ | |
11cd3bed | 1527 | FOR_EACH_BB_FN (bb, cfun) |
12c3874e | 1528 | { |
1d65f45c | 1529 | eh_landing_pad lp; |
628f6a4e | 1530 | edge_iterator ei; |
1d65f45c | 1531 | edge e; |
496a4ef5 | 1532 | |
1d65f45c | 1533 | lp = get_eh_landing_pad_from_rtx (BB_END (bb)); |
6a58eee9 | 1534 | |
1d65f45c RH |
1535 | FOR_EACH_EDGE (e, ei, bb->succs) |
1536 | if (e->flags & EDGE_EH) | |
1537 | break; | |
87c476a2 | 1538 | |
1d65f45c RH |
1539 | /* We should not have generated any new throwing insns during this |
1540 | pass, and we should not have lost any EH edges, so we only need | |
1541 | to handle two cases here: | |
1542 | (1) reachable handler and an existing edge to post-landing-pad, | |
1543 | (2) no reachable handler and no edge. */ | |
1544 | gcc_assert ((lp != NULL) == (e != NULL)); | |
1545 | if (lp != NULL) | |
87c476a2 | 1546 | { |
1d65f45c | 1547 | gcc_assert (BB_HEAD (e->dest) == label_rtx (lp->post_landing_pad)); |
f19c9228 | 1548 | |
1d65f45c RH |
1549 | redirect_edge_succ (e, BLOCK_FOR_INSN (lp->landing_pad)); |
1550 | e->flags |= (CALL_P (BB_END (bb)) | |
1551 | ? EDGE_ABNORMAL | EDGE_ABNORMAL_CALL | |
1552 | : EDGE_ABNORMAL); | |
52a11cbf RH |
1553 | } |
1554 | } | |
56b97603 EB |
1555 | |
1556 | if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ | |
1557 | /* Kludge for Alpha (see alpha_gp_save_rtx). */ | |
1558 | || single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun))->insns.r) | |
1559 | commit_edge_insertions (); | |
4956d07c | 1560 | } |
1d65f45c RH |
1561 | \f |
1562 | /* This section handles removing dead code for flow. */ | |
a8da523f JH |
1563 | |
1564 | void | |
1d65f45c | 1565 | remove_eh_landing_pad (eh_landing_pad lp) |
a8da523f | 1566 | { |
1d65f45c | 1567 | eh_landing_pad *pp; |
a8da523f | 1568 | |
1d65f45c RH |
1569 | for (pp = &lp->region->landing_pads; *pp != lp; pp = &(*pp)->next_lp) |
1570 | continue; | |
1571 | *pp = lp->next_lp; | |
b8698a0f | 1572 | |
1d65f45c RH |
1573 | if (lp->post_landing_pad) |
1574 | EH_LANDING_PAD_NR (lp->post_landing_pad) = 0; | |
9771b263 | 1575 | (*cfun->eh->lp_array)[lp->index] = NULL; |
a8da523f JH |
1576 | } |
1577 | ||
d273b176 | 1578 | /* Splice the EH region at PP from the region tree. */ |
496a4ef5 | 1579 | |
d273b176 SB |
1580 | static void |
1581 | remove_eh_handler_splicer (eh_region *pp) | |
496a4ef5 | 1582 | { |
d273b176 | 1583 | eh_region region = *pp; |
1d65f45c | 1584 | eh_landing_pad lp; |
496a4ef5 | 1585 | |
1d65f45c | 1586 | for (lp = region->landing_pads; lp ; lp = lp->next_lp) |
6d07ad98 | 1587 | { |
1d65f45c RH |
1588 | if (lp->post_landing_pad) |
1589 | EH_LANDING_PAD_NR (lp->post_landing_pad) = 0; | |
9771b263 | 1590 | (*cfun->eh->lp_array)[lp->index] = NULL; |
6d07ad98 | 1591 | } |
f698d217 | 1592 | |
1d65f45c | 1593 | if (region->inner) |
f698d217 | 1594 | { |
d273b176 SB |
1595 | eh_region p, outer; |
1596 | outer = region->outer; | |
1597 | ||
1d65f45c RH |
1598 | *pp = p = region->inner; |
1599 | do | |
1600 | { | |
1601 | p->outer = outer; | |
1602 | pp = &p->next_peer; | |
1603 | p = *pp; | |
1604 | } | |
1605 | while (p); | |
f698d217 | 1606 | } |
1d65f45c | 1607 | *pp = region->next_peer; |
87ff9c8e | 1608 | |
9771b263 | 1609 | (*cfun->eh->region_array)[region->index] = NULL; |
1d65f45c | 1610 | } |
87ff9c8e | 1611 | |
d273b176 SB |
1612 | /* Splice a single EH region REGION from the region tree. |
1613 | ||
1614 | To unlink REGION, we need to find the pointer to it with a relatively | |
1615 | expensive search in REGION's outer region. If you are going to | |
1616 | remove a number of handlers, using remove_unreachable_eh_regions may | |
1617 | be a better option. */ | |
1618 | ||
1619 | void | |
1620 | remove_eh_handler (eh_region region) | |
1621 | { | |
1622 | eh_region *pp, *pp_start, p, outer; | |
1623 | ||
1624 | outer = region->outer; | |
1625 | if (outer) | |
1626 | pp_start = &outer->inner; | |
1627 | else | |
1628 | pp_start = &cfun->eh->region_tree; | |
1629 | for (pp = pp_start, p = *pp; p != region; pp = &p->next_peer, p = *pp) | |
1630 | continue; | |
1631 | ||
1632 | remove_eh_handler_splicer (pp); | |
1633 | } | |
1634 | ||
1635 | /* Worker for remove_unreachable_eh_regions. | |
1636 | PP is a pointer to the region to start a region tree depth-first | |
1637 | search from. R_REACHABLE is the set of regions that have to be | |
1638 | preserved. */ | |
1639 | ||
1640 | static void | |
1641 | remove_unreachable_eh_regions_worker (eh_region *pp, sbitmap r_reachable) | |
1642 | { | |
1643 | while (*pp) | |
1644 | { | |
1645 | eh_region region = *pp; | |
1646 | remove_unreachable_eh_regions_worker (®ion->inner, r_reachable); | |
1647 | if (!bitmap_bit_p (r_reachable, region->index)) | |
1648 | remove_eh_handler_splicer (pp); | |
1649 | else | |
1650 | pp = ®ion->next_peer; | |
1651 | } | |
1652 | } | |
1653 | ||
1654 | /* Splice all EH regions *not* marked in R_REACHABLE from the region tree. | |
1655 | Do this by traversing the EH tree top-down and splice out regions that | |
1656 | are not marked. By removing regions from the leaves, we avoid costly | |
1657 | searches in the region tree. */ | |
1658 | ||
1659 | void | |
1660 | remove_unreachable_eh_regions (sbitmap r_reachable) | |
1661 | { | |
1662 | remove_unreachable_eh_regions_worker (&cfun->eh->region_tree, r_reachable); | |
1663 | } | |
1664 | ||
1d65f45c RH |
1665 | /* Invokes CALLBACK for every exception handler landing pad label. |
1666 | Only used by reload hackery; should not be used by new code. */ | |
87ff9c8e | 1667 | |
1d65f45c RH |
1668 | void |
1669 | for_each_eh_label (void (*callback) (rtx)) | |
87ff9c8e | 1670 | { |
1d65f45c RH |
1671 | eh_landing_pad lp; |
1672 | int i; | |
52a11cbf | 1673 | |
9771b263 | 1674 | for (i = 1; vec_safe_iterate (cfun->eh->lp_array, i, &lp); ++i) |
f54a7f6f | 1675 | { |
1d65f45c | 1676 | if (lp) |
4537ec0c | 1677 | { |
e67d1102 | 1678 | rtx_code_label *lab = lp->landing_pad; |
1d65f45c RH |
1679 | if (lab && LABEL_P (lab)) |
1680 | (*callback) (lab); | |
4537ec0c | 1681 | } |
52a11cbf | 1682 | } |
87ff9c8e | 1683 | } |
1d65f45c RH |
1684 | \f |
1685 | /* Create the REG_EH_REGION note for INSN, given its ECF_FLAGS for a | |
b8698a0f | 1686 | call insn. |
1d65f45c RH |
1687 | |
1688 | At the gimple level, we use LP_NR | |
1689 | > 0 : The statement transfers to landing pad LP_NR | |
1690 | = 0 : The statement is outside any EH region | |
1691 | < 0 : The statement is within MUST_NOT_THROW region -LP_NR. | |
1692 | ||
1693 | At the rtl level, we use LP_NR | |
1694 | > 0 : The insn transfers to landing pad LP_NR | |
1695 | = 0 : The insn cannot throw | |
1696 | < 0 : The insn is within MUST_NOT_THROW region -LP_NR | |
1697 | = INT_MIN : The insn cannot throw or execute a nonlocal-goto. | |
1698 | missing note: The insn is outside any EH region. | |
1699 | ||
1700 | ??? This difference probably ought to be avoided. We could stand | |
1701 | to record nothrow for arbitrary gimple statements, and so avoid | |
1702 | some moderately complex lookups in stmt_could_throw_p. Perhaps | |
1703 | NOTHROW should be mapped on both sides to INT_MIN. Perhaps the | |
1704 | no-nonlocal-goto property should be recorded elsewhere as a bit | |
1705 | on the call_insn directly. Perhaps we should make more use of | |
1706 | attaching the trees to call_insns (reachable via symbol_ref in | |
1707 | direct call cases) and just pull the data out of the trees. */ | |
87ff9c8e | 1708 | |
1d65f45c | 1709 | void |
84f16edb | 1710 | make_reg_eh_region_note (rtx_insn *insn, int ecf_flags, int lp_nr) |
87ff9c8e | 1711 | { |
1d65f45c RH |
1712 | rtx value; |
1713 | if (ecf_flags & ECF_NOTHROW) | |
1714 | value = const0_rtx; | |
1715 | else if (lp_nr != 0) | |
1716 | value = GEN_INT (lp_nr); | |
52a11cbf | 1717 | else |
1d65f45c RH |
1718 | return; |
1719 | add_reg_note (insn, REG_EH_REGION, value); | |
87ff9c8e RH |
1720 | } |
1721 | ||
1d65f45c RH |
1722 | /* Create a REG_EH_REGION note for a CALL_INSN that cannot throw |
1723 | nor perform a non-local goto. Replace the region note if it | |
1724 | already exists. */ | |
87ff9c8e | 1725 | |
1d65f45c | 1726 | void |
84f16edb | 1727 | make_reg_eh_region_note_nothrow_nononlocal (rtx_insn *insn) |
87ff9c8e | 1728 | { |
1d65f45c RH |
1729 | rtx note = find_reg_note (insn, REG_EH_REGION, NULL_RTX); |
1730 | rtx intmin = GEN_INT (INT_MIN); | |
52a11cbf | 1731 | |
1d65f45c RH |
1732 | if (note != 0) |
1733 | XEXP (note, 0) = intmin; | |
1734 | else | |
1735 | add_reg_note (insn, REG_EH_REGION, intmin); | |
1736 | } | |
21cd906e | 1737 | |
1d65f45c RH |
1738 | /* Return true if INSN could throw, assuming no REG_EH_REGION note |
1739 | to the contrary. */ | |
21cd906e | 1740 | |
1d65f45c RH |
1741 | bool |
1742 | insn_could_throw_p (const_rtx insn) | |
1743 | { | |
642d55de EB |
1744 | if (!flag_exceptions) |
1745 | return false; | |
1d65f45c RH |
1746 | if (CALL_P (insn)) |
1747 | return true; | |
8f4f502f | 1748 | if (INSN_P (insn) && cfun->can_throw_non_call_exceptions) |
1d65f45c RH |
1749 | return may_trap_p (PATTERN (insn)); |
1750 | return false; | |
1751 | } | |
98f464e0 | 1752 | |
1d65f45c RH |
1753 | /* Copy an REG_EH_REGION note to each insn that might throw beginning |
1754 | at FIRST and ending at LAST. NOTE_OR_INSN is either the source insn | |
1755 | to look for a note, or the note itself. */ | |
98f464e0 | 1756 | |
1d65f45c | 1757 | void |
dc01c3d1 | 1758 | copy_reg_eh_region_note_forward (rtx note_or_insn, rtx_insn *first, rtx last) |
1d65f45c | 1759 | { |
dc01c3d1 DM |
1760 | rtx_insn *insn; |
1761 | rtx note = note_or_insn; | |
21cd906e | 1762 | |
1d65f45c RH |
1763 | if (INSN_P (note_or_insn)) |
1764 | { | |
1765 | note = find_reg_note (note_or_insn, REG_EH_REGION, NULL_RTX); | |
1766 | if (note == NULL) | |
1767 | return; | |
21cd906e | 1768 | } |
89cfdb7e JJ |
1769 | else if (is_a <rtx_insn *> (note_or_insn)) |
1770 | return; | |
1d65f45c RH |
1771 | note = XEXP (note, 0); |
1772 | ||
1773 | for (insn = first; insn != last ; insn = NEXT_INSN (insn)) | |
1774 | if (!find_reg_note (insn, REG_EH_REGION, NULL_RTX) | |
1775 | && insn_could_throw_p (insn)) | |
1776 | add_reg_note (insn, REG_EH_REGION, note); | |
fa51b01b | 1777 | } |
4956d07c | 1778 | |
1d65f45c | 1779 | /* Likewise, but iterate backward. */ |
4956d07c | 1780 | |
6de9cd9a | 1781 | void |
dc01c3d1 | 1782 | copy_reg_eh_region_note_backward (rtx note_or_insn, rtx_insn *last, rtx first) |
4956d07c | 1783 | { |
dc01c3d1 DM |
1784 | rtx_insn *insn; |
1785 | rtx note = note_or_insn; | |
fb13d4d0 | 1786 | |
1d65f45c | 1787 | if (INSN_P (note_or_insn)) |
7f206d8f | 1788 | { |
1d65f45c RH |
1789 | note = find_reg_note (note_or_insn, REG_EH_REGION, NULL_RTX); |
1790 | if (note == NULL) | |
6de9cd9a | 1791 | return; |
52a11cbf | 1792 | } |
89cfdb7e JJ |
1793 | else if (is_a <rtx_insn *> (note_or_insn)) |
1794 | return; | |
1d65f45c | 1795 | note = XEXP (note, 0); |
fac62ecf | 1796 | |
1d65f45c RH |
1797 | for (insn = last; insn != first; insn = PREV_INSN (insn)) |
1798 | if (insn_could_throw_p (insn)) | |
1799 | add_reg_note (insn, REG_EH_REGION, note); | |
6de9cd9a DN |
1800 | } |
1801 | ||
6de9cd9a | 1802 | |
1d65f45c RH |
1803 | /* Extract all EH information from INSN. Return true if the insn |
1804 | was marked NOTHROW. */ | |
6de9cd9a | 1805 | |
1d65f45c RH |
1806 | static bool |
1807 | get_eh_region_and_lp_from_rtx (const_rtx insn, eh_region *pr, | |
1808 | eh_landing_pad *plp) | |
6de9cd9a | 1809 | { |
1d65f45c RH |
1810 | eh_landing_pad lp = NULL; |
1811 | eh_region r = NULL; | |
1812 | bool ret = false; | |
1813 | rtx note; | |
1814 | int lp_nr; | |
6de9cd9a | 1815 | |
1d65f45c RH |
1816 | if (! INSN_P (insn)) |
1817 | goto egress; | |
1818 | ||
1819 | if (NONJUMP_INSN_P (insn) | |
1820 | && GET_CODE (PATTERN (insn)) == SEQUENCE) | |
1821 | insn = XVECEXP (PATTERN (insn), 0, 0); | |
6de9cd9a | 1822 | |
1d65f45c RH |
1823 | note = find_reg_note (insn, REG_EH_REGION, NULL_RTX); |
1824 | if (!note) | |
6de9cd9a | 1825 | { |
1d65f45c RH |
1826 | ret = !insn_could_throw_p (insn); |
1827 | goto egress; | |
6de9cd9a | 1828 | } |
1d65f45c RH |
1829 | |
1830 | lp_nr = INTVAL (XEXP (note, 0)); | |
1831 | if (lp_nr == 0 || lp_nr == INT_MIN) | |
6de9cd9a | 1832 | { |
1d65f45c RH |
1833 | ret = true; |
1834 | goto egress; | |
6de9cd9a | 1835 | } |
502b8322 | 1836 | |
1d65f45c | 1837 | if (lp_nr < 0) |
9771b263 | 1838 | r = (*cfun->eh->region_array)[-lp_nr]; |
1d65f45c RH |
1839 | else |
1840 | { | |
9771b263 | 1841 | lp = (*cfun->eh->lp_array)[lp_nr]; |
1d65f45c RH |
1842 | r = lp->region; |
1843 | } | |
6de9cd9a | 1844 | |
1d65f45c RH |
1845 | egress: |
1846 | *plp = lp; | |
1847 | *pr = r; | |
1848 | return ret; | |
fb13d4d0 JM |
1849 | } |
1850 | ||
1d65f45c RH |
1851 | /* Return the landing pad to which INSN may go, or NULL if it does not |
1852 | have a reachable landing pad within this function. */ | |
4956d07c | 1853 | |
1d65f45c RH |
1854 | eh_landing_pad |
1855 | get_eh_landing_pad_from_rtx (const_rtx insn) | |
4956d07c | 1856 | { |
1d65f45c RH |
1857 | eh_landing_pad lp; |
1858 | eh_region r; | |
6de9cd9a | 1859 | |
1d65f45c RH |
1860 | get_eh_region_and_lp_from_rtx (insn, &r, &lp); |
1861 | return lp; | |
1862 | } | |
6de9cd9a | 1863 | |
1d65f45c RH |
1864 | /* Return the region to which INSN may go, or NULL if it does not |
1865 | have a reachable region within this function. */ | |
6de9cd9a | 1866 | |
1d65f45c RH |
1867 | eh_region |
1868 | get_eh_region_from_rtx (const_rtx insn) | |
1869 | { | |
1870 | eh_landing_pad lp; | |
1871 | eh_region r; | |
6de9cd9a | 1872 | |
1d65f45c RH |
1873 | get_eh_region_and_lp_from_rtx (insn, &r, &lp); |
1874 | return r; | |
6de9cd9a DN |
1875 | } |
1876 | ||
1d65f45c RH |
1877 | /* Return true if INSN throws and is caught by something in this function. */ |
1878 | ||
6de9cd9a | 1879 | bool |
ed7a4b4b | 1880 | can_throw_internal (const_rtx insn) |
6de9cd9a | 1881 | { |
1d65f45c RH |
1882 | return get_eh_landing_pad_from_rtx (insn) != NULL; |
1883 | } | |
1884 | ||
1885 | /* Return true if INSN throws and escapes from the current function. */ | |
1886 | ||
1887 | bool | |
1888 | can_throw_external (const_rtx insn) | |
1889 | { | |
1890 | eh_landing_pad lp; | |
1891 | eh_region r; | |
1892 | bool nothrow; | |
e6cfb550 | 1893 | |
52a11cbf RH |
1894 | if (! INSN_P (insn)) |
1895 | return false; | |
12670d88 | 1896 | |
4b4bf941 | 1897 | if (NONJUMP_INSN_P (insn) |
52a11cbf | 1898 | && GET_CODE (PATTERN (insn)) == SEQUENCE) |
1d65f45c | 1899 | { |
2a62e439 DM |
1900 | rtx_sequence *seq = as_a <rtx_sequence *> (PATTERN (insn)); |
1901 | int i, n = seq->len (); | |
4956d07c | 1902 | |
1d65f45c | 1903 | for (i = 0; i < n; i++) |
2a62e439 | 1904 | if (can_throw_external (seq->element (i))) |
1d65f45c | 1905 | return true; |
6de9cd9a | 1906 | |
1d65f45c RH |
1907 | return false; |
1908 | } | |
6de9cd9a | 1909 | |
1d65f45c | 1910 | nothrow = get_eh_region_and_lp_from_rtx (insn, &r, &lp); |
6de9cd9a | 1911 | |
1d65f45c RH |
1912 | /* If we can't throw, we obviously can't throw external. */ |
1913 | if (nothrow) | |
1914 | return false; | |
4956d07c | 1915 | |
1d65f45c RH |
1916 | /* If we have an internal landing pad, then we're not external. */ |
1917 | if (lp != NULL) | |
1918 | return false; | |
4956d07c | 1919 | |
1d65f45c RH |
1920 | /* If we're not within an EH region, then we are external. */ |
1921 | if (r == NULL) | |
1922 | return true; | |
4956d07c | 1923 | |
1d65f45c RH |
1924 | /* The only thing that ought to be left is MUST_NOT_THROW regions, |
1925 | which don't always have landing pads. */ | |
1926 | gcc_assert (r->type == ERT_MUST_NOT_THROW); | |
1927 | return false; | |
52a11cbf | 1928 | } |
4956d07c | 1929 | |
1d65f45c RH |
1930 | /* Return true if INSN cannot throw at all. */ |
1931 | ||
52a11cbf | 1932 | bool |
1d65f45c | 1933 | insn_nothrow_p (const_rtx insn) |
4956d07c | 1934 | { |
1d65f45c RH |
1935 | eh_landing_pad lp; |
1936 | eh_region r; | |
4956d07c | 1937 | |
52a11cbf | 1938 | if (! INSN_P (insn)) |
1d65f45c | 1939 | return true; |
b59fa6cf | 1940 | |
4b4bf941 | 1941 | if (NONJUMP_INSN_P (insn) |
52a11cbf | 1942 | && GET_CODE (PATTERN (insn)) == SEQUENCE) |
efaadb93 | 1943 | { |
2a62e439 DM |
1944 | rtx_sequence *seq = as_a <rtx_sequence *> (PATTERN (insn)); |
1945 | int i, n = seq->len (); | |
efaadb93 AN |
1946 | |
1947 | for (i = 0; i < n; i++) | |
2a62e439 | 1948 | if (!insn_nothrow_p (seq->element (i))) |
1d65f45c | 1949 | return false; |
efaadb93 | 1950 | |
1d65f45c | 1951 | return true; |
efaadb93 | 1952 | } |
52a11cbf | 1953 | |
1d65f45c RH |
1954 | return get_eh_region_and_lp_from_rtx (insn, &r, &lp); |
1955 | } | |
1956 | ||
1957 | /* Return true if INSN can perform a non-local goto. */ | |
1958 | /* ??? This test is here in this file because it (ab)uses REG_EH_REGION. */ | |
1959 | ||
1960 | bool | |
d8c1e9b6 | 1961 | can_nonlocal_goto (const rtx_insn *insn) |
1d65f45c RH |
1962 | { |
1963 | if (nonlocal_goto_handler_labels && CALL_P (insn)) | |
52a11cbf | 1964 | { |
1d65f45c RH |
1965 | rtx note = find_reg_note (insn, REG_EH_REGION, NULL_RTX); |
1966 | if (!note || INTVAL (XEXP (note, 0)) != INT_MIN) | |
1967 | return true; | |
52a11cbf | 1968 | } |
1d65f45c | 1969 | return false; |
4956d07c | 1970 | } |
1d65f45c | 1971 | \f |
e3b5732b | 1972 | /* Set TREE_NOTHROW and crtl->all_throwers_are_sibcalls. */ |
6814a8a0 | 1973 | |
20cdc2be | 1974 | static unsigned int |
502b8322 | 1975 | set_nothrow_function_flags (void) |
1ef1bf06 | 1976 | { |
f8b23302 | 1977 | rtx_insn *insn; |
502b8322 | 1978 | |
fe89fbc5 | 1979 | crtl->nothrow = 1; |
1ef1bf06 | 1980 | |
e3b5732b | 1981 | /* Assume crtl->all_throwers_are_sibcalls until we encounter |
b6128b8c SH |
1982 | something that can throw an exception. We specifically exempt |
1983 | CALL_INSNs that are SIBLING_CALL_P, as these are really jumps, | |
1984 | and can't throw. Most CALL_INSNs are not SIBLING_CALL_P, so this | |
1985 | is optimistic. */ | |
1ef1bf06 | 1986 | |
e3b5732b | 1987 | crtl->all_throwers_are_sibcalls = 1; |
b6128b8c | 1988 | |
fe89fbc5 JH |
1989 | /* If we don't know that this implementation of the function will |
1990 | actually be used, then we must not set TREE_NOTHROW, since | |
1991 | callers must not assume that this function does not throw. */ | |
1992 | if (TREE_NOTHROW (current_function_decl)) | |
1993 | return 0; | |
1994 | ||
b6128b8c | 1995 | if (! flag_exceptions) |
c2924966 | 1996 | return 0; |
502b8322 | 1997 | |
1ef1bf06 | 1998 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) |
52a11cbf | 1999 | if (can_throw_external (insn)) |
b6128b8c | 2000 | { |
fe89fbc5 | 2001 | crtl->nothrow = 0; |
b6128b8c | 2002 | |
4b4bf941 | 2003 | if (!CALL_P (insn) || !SIBLING_CALL_P (insn)) |
b6128b8c | 2004 | { |
e3b5732b | 2005 | crtl->all_throwers_are_sibcalls = 0; |
c2924966 | 2006 | return 0; |
b6128b8c SH |
2007 | } |
2008 | } | |
2009 | ||
fe89fbc5 | 2010 | if (crtl->nothrow |
d52f5295 | 2011 | && (cgraph_node::get (current_function_decl)->get_availability () |
fe89fbc5 | 2012 | >= AVAIL_AVAILABLE)) |
f7dd1864 | 2013 | { |
d52f5295 | 2014 | struct cgraph_node *node = cgraph_node::get (current_function_decl); |
2505c5ed JH |
2015 | struct cgraph_edge *e; |
2016 | for (e = node->callers; e; e = e->next_caller) | |
2017 | e->can_throw_external = false; | |
d52f5295 | 2018 | node->set_nothrow_flag (true); |
f7dd1864 AN |
2019 | |
2020 | if (dump_file) | |
2021 | fprintf (dump_file, "Marking function nothrow: %s\n\n", | |
2022 | current_function_name ()); | |
2023 | } | |
c2924966 | 2024 | return 0; |
1ef1bf06 | 2025 | } |
52a11cbf | 2026 | |
27a4cd48 DM |
2027 | namespace { |
2028 | ||
2029 | const pass_data pass_data_set_nothrow_function_flags = | |
2030 | { | |
2031 | RTL_PASS, /* type */ | |
2032 | "nothrow", /* name */ | |
2033 | OPTGROUP_NONE, /* optinfo_flags */ | |
27a4cd48 DM |
2034 | TV_NONE, /* tv_id */ |
2035 | 0, /* properties_required */ | |
2036 | 0, /* properties_provided */ | |
2037 | 0, /* properties_destroyed */ | |
2038 | 0, /* todo_flags_start */ | |
2039 | 0, /* todo_flags_finish */ | |
ef330312 PB |
2040 | }; |
2041 | ||
27a4cd48 DM |
2042 | class pass_set_nothrow_function_flags : public rtl_opt_pass |
2043 | { | |
2044 | public: | |
c3284718 RS |
2045 | pass_set_nothrow_function_flags (gcc::context *ctxt) |
2046 | : rtl_opt_pass (pass_data_set_nothrow_function_flags, ctxt) | |
27a4cd48 DM |
2047 | {} |
2048 | ||
2049 | /* opt_pass methods: */ | |
725793af | 2050 | unsigned int execute (function *) final override |
be55bfe6 TS |
2051 | { |
2052 | return set_nothrow_function_flags (); | |
2053 | } | |
27a4cd48 DM |
2054 | |
2055 | }; // class pass_set_nothrow_function_flags | |
2056 | ||
2057 | } // anon namespace | |
2058 | ||
2059 | rtl_opt_pass * | |
2060 | make_pass_set_nothrow_function_flags (gcc::context *ctxt) | |
2061 | { | |
2062 | return new pass_set_nothrow_function_flags (ctxt); | |
2063 | } | |
2064 | ||
1d65f45c RH |
2065 | \f |
2066 | /* Various hooks for unwind library. */ | |
2067 | ||
2068 | /* Expand the EH support builtin functions: | |
2069 | __builtin_eh_pointer and __builtin_eh_filter. */ | |
2070 | ||
2071 | static eh_region | |
2072 | expand_builtin_eh_common (tree region_nr_t) | |
2073 | { | |
2074 | HOST_WIDE_INT region_nr; | |
2075 | eh_region region; | |
2076 | ||
9541ffee | 2077 | gcc_assert (tree_fits_shwi_p (region_nr_t)); |
9439e9a1 | 2078 | region_nr = tree_to_shwi (region_nr_t); |
1d65f45c | 2079 | |
9771b263 | 2080 | region = (*cfun->eh->region_array)[region_nr]; |
1d65f45c RH |
2081 | |
2082 | /* ??? We shouldn't have been able to delete a eh region without | |
2083 | deleting all the code that depended on it. */ | |
2084 | gcc_assert (region != NULL); | |
2085 | ||
2086 | return region; | |
2087 | } | |
2088 | ||
2089 | /* Expand to the exc_ptr value from the given eh region. */ | |
2090 | ||
2091 | rtx | |
2092 | expand_builtin_eh_pointer (tree exp) | |
2093 | { | |
2094 | eh_region region | |
2095 | = expand_builtin_eh_common (CALL_EXPR_ARG (exp, 0)); | |
2096 | if (region->exc_ptr_reg == NULL) | |
2097 | region->exc_ptr_reg = gen_reg_rtx (ptr_mode); | |
2098 | return region->exc_ptr_reg; | |
2099 | } | |
2100 | ||
2101 | /* Expand to the filter value from the given eh region. */ | |
2102 | ||
2103 | rtx | |
2104 | expand_builtin_eh_filter (tree exp) | |
2105 | { | |
2106 | eh_region region | |
2107 | = expand_builtin_eh_common (CALL_EXPR_ARG (exp, 0)); | |
2108 | if (region->filter_reg == NULL) | |
2109 | region->filter_reg = gen_reg_rtx (targetm.eh_return_filter_mode ()); | |
2110 | return region->filter_reg; | |
2111 | } | |
2112 | ||
2113 | /* Copy the exc_ptr and filter values from one landing pad's registers | |
2114 | to another. This is used to inline the resx statement. */ | |
2115 | ||
2116 | rtx | |
2117 | expand_builtin_eh_copy_values (tree exp) | |
2118 | { | |
2119 | eh_region dst | |
2120 | = expand_builtin_eh_common (CALL_EXPR_ARG (exp, 0)); | |
2121 | eh_region src | |
2122 | = expand_builtin_eh_common (CALL_EXPR_ARG (exp, 1)); | |
095a2d76 | 2123 | scalar_int_mode fmode = targetm.eh_return_filter_mode (); |
1d65f45c RH |
2124 | |
2125 | if (dst->exc_ptr_reg == NULL) | |
2126 | dst->exc_ptr_reg = gen_reg_rtx (ptr_mode); | |
2127 | if (src->exc_ptr_reg == NULL) | |
2128 | src->exc_ptr_reg = gen_reg_rtx (ptr_mode); | |
2129 | ||
2130 | if (dst->filter_reg == NULL) | |
2131 | dst->filter_reg = gen_reg_rtx (fmode); | |
2132 | if (src->filter_reg == NULL) | |
2133 | src->filter_reg = gen_reg_rtx (fmode); | |
2134 | ||
2135 | emit_move_insn (dst->exc_ptr_reg, src->exc_ptr_reg); | |
2136 | emit_move_insn (dst->filter_reg, src->filter_reg); | |
2137 | ||
2138 | return const0_rtx; | |
2139 | } | |
ca55abae JM |
2140 | |
2141 | /* Do any necessary initialization to access arbitrary stack frames. | |
2142 | On the SPARC, this means flushing the register windows. */ | |
2143 | ||
2144 | void | |
502b8322 | 2145 | expand_builtin_unwind_init (void) |
ca55abae JM |
2146 | { |
2147 | /* Set this so all the registers get saved in our frame; we need to be | |
30f7a378 | 2148 | able to copy the saved values for any registers from frames we unwind. */ |
e3b5732b | 2149 | crtl->saves_all_registers = 1; |
ca55abae | 2150 | |
ca55abae | 2151 | SETUP_FRAME_ADDRESSES (); |
ca55abae JM |
2152 | } |
2153 | ||
1d65f45c RH |
2154 | /* Map a non-negative number to an eh return data register number; expands |
2155 | to -1 if no return data register is associated with the input number. | |
2156 | At least the inputs 0 and 1 must be mapped; the target may provide more. */ | |
2157 | ||
52a11cbf | 2158 | rtx |
5039610b | 2159 | expand_builtin_eh_return_data_regno (tree exp) |
52a11cbf | 2160 | { |
5039610b | 2161 | tree which = CALL_EXPR_ARG (exp, 0); |
52a11cbf RH |
2162 | unsigned HOST_WIDE_INT iwhich; |
2163 | ||
2164 | if (TREE_CODE (which) != INTEGER_CST) | |
2165 | { | |
971801ff | 2166 | error ("argument of %<__builtin_eh_return_regno%> must be constant"); |
52a11cbf RH |
2167 | return constm1_rtx; |
2168 | } | |
2169 | ||
ae7e9ddd | 2170 | iwhich = tree_to_uhwi (which); |
52a11cbf RH |
2171 | iwhich = EH_RETURN_DATA_REGNO (iwhich); |
2172 | if (iwhich == INVALID_REGNUM) | |
2173 | return constm1_rtx; | |
2174 | ||
2175 | #ifdef DWARF_FRAME_REGNUM | |
2176 | iwhich = DWARF_FRAME_REGNUM (iwhich); | |
2177 | #else | |
ca60bd93 | 2178 | iwhich = DEBUGGER_REGNO (iwhich); |
52a11cbf RH |
2179 | #endif |
2180 | ||
3f2c5d1a | 2181 | return GEN_INT (iwhich); |
52a11cbf RH |
2182 | } |
2183 | ||
ca55abae JM |
2184 | /* Given a value extracted from the return address register or stack slot, |
2185 | return the actual address encoded in that value. */ | |
2186 | ||
2187 | rtx | |
502b8322 | 2188 | expand_builtin_extract_return_addr (tree addr_tree) |
ca55abae | 2189 | { |
49452c07 | 2190 | rtx addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL); |
52a11cbf | 2191 | |
0ab38418 EC |
2192 | if (GET_MODE (addr) != Pmode |
2193 | && GET_MODE (addr) != VOIDmode) | |
2194 | { | |
2195 | #ifdef POINTERS_EXTEND_UNSIGNED | |
2196 | addr = convert_memory_address (Pmode, addr); | |
2197 | #else | |
2198 | addr = convert_to_mode (Pmode, addr, 0); | |
2199 | #endif | |
2200 | } | |
2201 | ||
52a11cbf | 2202 | /* First mask out any unwanted bits. */ |
cbc7d031 TS |
2203 | rtx mask = MASK_RETURN_ADDR; |
2204 | if (mask) | |
2205 | expand_and (Pmode, addr, mask, addr); | |
52a11cbf RH |
2206 | |
2207 | /* Then adjust to find the real return address. */ | |
a8a6b3df TS |
2208 | if (RETURN_ADDR_OFFSET) |
2209 | addr = plus_constant (Pmode, addr, RETURN_ADDR_OFFSET); | |
52a11cbf RH |
2210 | |
2211 | return addr; | |
ca55abae JM |
2212 | } |
2213 | ||
2214 | /* Given an actual address in addr_tree, do any necessary encoding | |
2215 | and return the value to be stored in the return address register or | |
2216 | stack slot so the epilogue will return to that address. */ | |
2217 | ||
2218 | rtx | |
502b8322 | 2219 | expand_builtin_frob_return_addr (tree addr_tree) |
ca55abae | 2220 | { |
49452c07 | 2221 | rtx addr = expand_expr (addr_tree, NULL_RTX, ptr_mode, EXPAND_NORMAL); |
52a11cbf | 2222 | |
5ae6cd0d | 2223 | addr = convert_memory_address (Pmode, addr); |
be128cd9 | 2224 | |
a8a6b3df TS |
2225 | if (RETURN_ADDR_OFFSET) |
2226 | { | |
2227 | addr = force_reg (Pmode, addr); | |
2228 | addr = plus_constant (Pmode, addr, -RETURN_ADDR_OFFSET); | |
2229 | } | |
52a11cbf | 2230 | |
ca55abae JM |
2231 | return addr; |
2232 | } | |
2233 | ||
52a11cbf RH |
2234 | /* Set up the epilogue with the magic bits we'll need to return to the |
2235 | exception handler. */ | |
ca55abae | 2236 | |
52a11cbf | 2237 | void |
502b8322 AJ |
2238 | expand_builtin_eh_return (tree stackadj_tree ATTRIBUTE_UNUSED, |
2239 | tree handler_tree) | |
ca55abae | 2240 | { |
34dc173c | 2241 | rtx tmp; |
ca55abae | 2242 | |
34dc173c | 2243 | #ifdef EH_RETURN_STACKADJ_RTX |
69c32ec8 | 2244 | tmp = expand_expr (stackadj_tree, crtl->eh.ehr_stackadj, |
49452c07 | 2245 | VOIDmode, EXPAND_NORMAL); |
5ae6cd0d | 2246 | tmp = convert_memory_address (Pmode, tmp); |
69c32ec8 | 2247 | if (!crtl->eh.ehr_stackadj) |
dcd7a7df | 2248 | crtl->eh.ehr_stackadj = copy_addr_to_reg (tmp); |
69c32ec8 JH |
2249 | else if (tmp != crtl->eh.ehr_stackadj) |
2250 | emit_move_insn (crtl->eh.ehr_stackadj, tmp); | |
be128cd9 RK |
2251 | #endif |
2252 | ||
69c32ec8 | 2253 | tmp = expand_expr (handler_tree, crtl->eh.ehr_handler, |
49452c07 | 2254 | VOIDmode, EXPAND_NORMAL); |
5ae6cd0d | 2255 | tmp = convert_memory_address (Pmode, tmp); |
69c32ec8 | 2256 | if (!crtl->eh.ehr_handler) |
dcd7a7df | 2257 | crtl->eh.ehr_handler = copy_addr_to_reg (tmp); |
69c32ec8 JH |
2258 | else if (tmp != crtl->eh.ehr_handler) |
2259 | emit_move_insn (crtl->eh.ehr_handler, tmp); | |
ca55abae | 2260 | |
69c32ec8 JH |
2261 | if (!crtl->eh.ehr_label) |
2262 | crtl->eh.ehr_label = gen_label_rtx (); | |
2263 | emit_jump (crtl->eh.ehr_label); | |
a1622f83 AM |
2264 | } |
2265 | ||
1d65f45c RH |
2266 | /* Expand __builtin_eh_return. This exit path from the function loads up |
2267 | the eh return data registers, adjusts the stack, and branches to a | |
2268 | given PC other than the normal return address. */ | |
2269 | ||
71038426 | 2270 | void |
502b8322 | 2271 | expand_eh_return (void) |
ca55abae | 2272 | { |
f8b23302 | 2273 | rtx_code_label *around_label; |
ca55abae | 2274 | |
69c32ec8 | 2275 | if (! crtl->eh.ehr_label) |
71038426 | 2276 | return; |
ca55abae | 2277 | |
e3b5732b | 2278 | crtl->calls_eh_return = 1; |
ca55abae | 2279 | |
34dc173c UW |
2280 | #ifdef EH_RETURN_STACKADJ_RTX |
2281 | emit_move_insn (EH_RETURN_STACKADJ_RTX, const0_rtx); | |
2282 | #endif | |
2283 | ||
52a11cbf | 2284 | around_label = gen_label_rtx (); |
52a11cbf | 2285 | emit_jump (around_label); |
ca55abae | 2286 | |
69c32ec8 | 2287 | emit_label (crtl->eh.ehr_label); |
52a11cbf | 2288 | clobber_return_register (); |
ca55abae | 2289 | |
34dc173c | 2290 | #ifdef EH_RETURN_STACKADJ_RTX |
69c32ec8 | 2291 | emit_move_insn (EH_RETURN_STACKADJ_RTX, crtl->eh.ehr_stackadj); |
34dc173c UW |
2292 | #endif |
2293 | ||
3b0b0013 RS |
2294 | if (targetm.have_eh_return ()) |
2295 | emit_insn (targetm.gen_eh_return (crtl->eh.ehr_handler)); | |
52a11cbf | 2296 | else |
52a11cbf | 2297 | { |
dd4fb609 TS |
2298 | if (rtx handler = EH_RETURN_HANDLER_RTX) |
2299 | emit_move_insn (handler, crtl->eh.ehr_handler); | |
2300 | else | |
a3f9f006 | 2301 | error ("%<__builtin_eh_return%> not supported on this target"); |
52a11cbf | 2302 | } |
71038426 | 2303 | |
52a11cbf | 2304 | emit_label (around_label); |
71038426 | 2305 | } |
c76362b4 JW |
2306 | |
2307 | /* Convert a ptr_mode address ADDR_TREE to a Pmode address controlled by | |
2308 | POINTERS_EXTEND_UNSIGNED and return it. */ | |
2309 | ||
2310 | rtx | |
2311 | expand_builtin_extend_pointer (tree addr_tree) | |
2312 | { | |
49452c07 | 2313 | rtx addr = expand_expr (addr_tree, NULL_RTX, ptr_mode, EXPAND_NORMAL); |
c76362b4 JW |
2314 | int extend; |
2315 | ||
2316 | #ifdef POINTERS_EXTEND_UNSIGNED | |
2317 | extend = POINTERS_EXTEND_UNSIGNED; | |
2318 | #else | |
2319 | /* The previous EH code did an unsigned extend by default, so we do this also | |
2320 | for consistency. */ | |
2321 | extend = 1; | |
2322 | #endif | |
2323 | ||
7b0518e3 | 2324 | return convert_modes (targetm.unwind_word_mode (), ptr_mode, addr, extend); |
c76362b4 | 2325 | } |
77d33a84 | 2326 | \f |
52a11cbf | 2327 | static int |
c203e8a7 | 2328 | add_action_record (action_hash_type *ar_hash, int filter, int next) |
77d33a84 | 2329 | { |
d858f359 | 2330 | struct action_record **slot, *new_ar, tmp; |
52a11cbf RH |
2331 | |
2332 | tmp.filter = filter; | |
2333 | tmp.next = next; | |
c203e8a7 | 2334 | slot = ar_hash->find_slot (&tmp, INSERT); |
77d33a84 | 2335 | |
d858f359 | 2336 | if ((new_ar = *slot) == NULL) |
77d33a84 | 2337 | { |
d858f359 | 2338 | new_ar = XNEW (struct action_record); |
9771b263 | 2339 | new_ar->offset = crtl->eh.action_record_data->length () + 1; |
d858f359 KG |
2340 | new_ar->filter = filter; |
2341 | new_ar->next = next; | |
2342 | *slot = new_ar; | |
52a11cbf RH |
2343 | |
2344 | /* The filter value goes in untouched. The link to the next | |
2345 | record is a "self-relative" byte offset, or zero to indicate | |
2346 | that there is no next record. So convert the absolute 1 based | |
eaec9b3d | 2347 | indices we've been carrying around into a displacement. */ |
52a11cbf | 2348 | |
69c32ec8 | 2349 | push_sleb128 (&crtl->eh.action_record_data, filter); |
52a11cbf | 2350 | if (next) |
9771b263 | 2351 | next -= crtl->eh.action_record_data->length () + 1; |
69c32ec8 | 2352 | push_sleb128 (&crtl->eh.action_record_data, next); |
77d33a84 | 2353 | } |
77d33a84 | 2354 | |
d858f359 | 2355 | return new_ar->offset; |
52a11cbf | 2356 | } |
77d33a84 | 2357 | |
52a11cbf | 2358 | static int |
c203e8a7 | 2359 | collect_one_action_chain (action_hash_type *ar_hash, eh_region region) |
77d33a84 | 2360 | { |
52a11cbf | 2361 | int next; |
77d33a84 | 2362 | |
52a11cbf RH |
2363 | /* If we've reached the top of the region chain, then we have |
2364 | no actions, and require no landing pad. */ | |
2365 | if (region == NULL) | |
2366 | return -1; | |
2367 | ||
2368 | switch (region->type) | |
77d33a84 | 2369 | { |
52a11cbf | 2370 | case ERT_CLEANUP: |
1d65f45c RH |
2371 | { |
2372 | eh_region r; | |
2373 | /* A cleanup adds a zero filter to the beginning of the chain, but | |
2374 | there are special cases to look out for. If there are *only* | |
2375 | cleanups along a path, then it compresses to a zero action. | |
2376 | Further, if there are multiple cleanups along a path, we only | |
2377 | need to represent one of them, as that is enough to trigger | |
2378 | entry to the landing pad at runtime. */ | |
2379 | next = collect_one_action_chain (ar_hash, region->outer); | |
2380 | if (next <= 0) | |
2381 | return 0; | |
2382 | for (r = region->outer; r ; r = r->outer) | |
2383 | if (r->type == ERT_CLEANUP) | |
2384 | return next; | |
2385 | return add_action_record (ar_hash, 0, next); | |
2386 | } | |
52a11cbf RH |
2387 | |
2388 | case ERT_TRY: | |
1d65f45c RH |
2389 | { |
2390 | eh_catch c; | |
2391 | ||
2392 | /* Process the associated catch regions in reverse order. | |
2393 | If there's a catch-all handler, then we don't need to | |
2394 | search outer regions. Use a magic -3 value to record | |
2395 | that we haven't done the outer search. */ | |
2396 | next = -3; | |
2397 | for (c = region->u.eh_try.last_catch; c ; c = c->prev_catch) | |
2398 | { | |
2399 | if (c->type_list == NULL) | |
2400 | { | |
2401 | /* Retrieve the filter from the head of the filter list | |
2402 | where we have stored it (see assign_filter_values). */ | |
2403 | int filter = TREE_INT_CST_LOW (TREE_VALUE (c->filter_list)); | |
2404 | next = add_action_record (ar_hash, filter, 0); | |
2405 | } | |
2406 | else | |
2407 | { | |
2408 | /* Once the outer search is done, trigger an action record for | |
2409 | each filter we have. */ | |
2410 | tree flt_node; | |
6d41a92f | 2411 | |
1d65f45c RH |
2412 | if (next == -3) |
2413 | { | |
2414 | next = collect_one_action_chain (ar_hash, region->outer); | |
2415 | ||
2416 | /* If there is no next action, terminate the chain. */ | |
2417 | if (next == -1) | |
2418 | next = 0; | |
2419 | /* If all outer actions are cleanups or must_not_throw, | |
2420 | we'll have no action record for it, since we had wanted | |
2421 | to encode these states in the call-site record directly. | |
2422 | Add a cleanup action to the chain to catch these. */ | |
2423 | else if (next <= 0) | |
2424 | next = add_action_record (ar_hash, 0, 0); | |
2425 | } | |
3f2c5d1a | 2426 | |
1d65f45c RH |
2427 | flt_node = c->filter_list; |
2428 | for (; flt_node; flt_node = TREE_CHAIN (flt_node)) | |
2429 | { | |
2430 | int filter = TREE_INT_CST_LOW (TREE_VALUE (flt_node)); | |
2431 | next = add_action_record (ar_hash, filter, next); | |
2432 | } | |
2433 | } | |
2434 | } | |
2435 | return next; | |
2436 | } | |
52a11cbf RH |
2437 | |
2438 | case ERT_ALLOWED_EXCEPTIONS: | |
2439 | /* An exception specification adds its filter to the | |
2440 | beginning of the chain. */ | |
2441 | next = collect_one_action_chain (ar_hash, region->outer); | |
0977ab3a RH |
2442 | |
2443 | /* If there is no next action, terminate the chain. */ | |
2444 | if (next == -1) | |
2445 | next = 0; | |
2446 | /* If all outer actions are cleanups or must_not_throw, | |
2447 | we'll have no action record for it, since we had wanted | |
2448 | to encode these states in the call-site record directly. | |
2449 | Add a cleanup action to the chain to catch these. */ | |
2450 | else if (next <= 0) | |
2451 | next = add_action_record (ar_hash, 0, 0); | |
083cad55 | 2452 | |
0977ab3a | 2453 | return add_action_record (ar_hash, region->u.allowed.filter, next); |
52a11cbf RH |
2454 | |
2455 | case ERT_MUST_NOT_THROW: | |
2456 | /* A must-not-throw region with no inner handlers or cleanups | |
2457 | requires no call-site entry. Note that this differs from | |
2458 | the no handler or cleanup case in that we do require an lsda | |
2459 | to be generated. Return a magic -2 value to record this. */ | |
2460 | return -2; | |
77d33a84 | 2461 | } |
1d65f45c RH |
2462 | |
2463 | gcc_unreachable (); | |
77d33a84 AM |
2464 | } |
2465 | ||
52a11cbf | 2466 | static int |
17f6e37d | 2467 | add_call_site (rtx landing_pad, int action, int section) |
77d33a84 | 2468 | { |
69c32ec8 | 2469 | call_site_record record; |
1d65f45c | 2470 | |
766090c2 | 2471 | record = ggc_alloc<call_site_record_d> (); |
69c32ec8 JH |
2472 | record->landing_pad = landing_pad; |
2473 | record->action = action; | |
77d33a84 | 2474 | |
9771b263 | 2475 | vec_safe_push (crtl->eh.call_site_record_v[section], record); |
77d33a84 | 2476 | |
9771b263 | 2477 | return call_site_base + crtl->eh.call_site_record_v[section]->length () - 1; |
77d33a84 AM |
2478 | } |
2479 | ||
66e8df53 | 2480 | static rtx_note * |
b32d5189 | 2481 | emit_note_eh_region_end (rtx_insn *insn) |
a4a51a52 | 2482 | { |
a4a51a52 UB |
2483 | return emit_note_after (NOTE_INSN_EH_REGION_END, insn); |
2484 | } | |
2485 | ||
3fa410c0 JH |
2486 | /* Add NOP after NOTE_INSN_SWITCH_TEXT_SECTIONS when the cold section starts |
2487 | with landing pad. | |
2488 | With landing pad being at offset 0 from the start label of the section | |
2489 | we would miss EH delivery because 0 is special and means no landing pad. */ | |
2490 | ||
2491 | static bool | |
2492 | maybe_add_nop_after_section_switch (void) | |
2493 | { | |
2494 | if (!crtl->uses_eh_lsda | |
2495 | || !crtl->eh.call_site_record_v[1]) | |
2496 | return false; | |
2497 | int n = vec_safe_length (crtl->eh.call_site_record_v[1]); | |
2498 | hash_set<rtx_insn *> visited; | |
2499 | ||
2500 | for (int i = 0; i < n; ++i) | |
2501 | { | |
2502 | struct call_site_record_d *cs | |
2503 | = (*crtl->eh.call_site_record_v[1])[i]; | |
2504 | if (cs->landing_pad) | |
2505 | { | |
2506 | rtx_insn *insn = as_a <rtx_insn *> (cs->landing_pad); | |
2507 | while (true) | |
2508 | { | |
2509 | /* Landing pads have LABEL_PRESERVE_P flag set. This check make | |
2510 | sure that we do not walk past landing pad visited earlier | |
2511 | which would result in possible quadratic behaviour. */ | |
2512 | if (LABEL_P (insn) && LABEL_PRESERVE_P (insn) | |
2513 | && visited.add (insn)) | |
2514 | break; | |
2515 | ||
2516 | /* Conservatively assume that ASM insn may be empty. We have | |
2517 | now way to tell what they contain. */ | |
2518 | if (active_insn_p (insn) | |
2519 | && GET_CODE (PATTERN (insn)) != ASM_INPUT | |
2520 | && GET_CODE (PATTERN (insn)) != ASM_OPERANDS) | |
2521 | break; | |
2522 | ||
2523 | /* If we reached the start of hot section, then NOP will be | |
2524 | needed. */ | |
2525 | if (GET_CODE (insn) == NOTE | |
2526 | && NOTE_KIND (insn) == NOTE_INSN_SWITCH_TEXT_SECTIONS) | |
2527 | { | |
2528 | emit_insn_after (gen_nop (), insn); | |
2529 | break; | |
2530 | } | |
2531 | ||
2532 | /* We visit only labels from cold section. We should never hit | |
2533 | begining of the insn stream here. */ | |
2534 | insn = PREV_INSN (insn); | |
2535 | } | |
2536 | } | |
2537 | } | |
2538 | return false; | |
2539 | } | |
2540 | ||
52a11cbf RH |
2541 | /* Turn REG_EH_REGION notes back into NOTE_INSN_EH_REGION notes. |
2542 | The new note numbers will not refer to region numbers, but | |
2543 | instead to call site entries. */ | |
77d33a84 | 2544 | |
1d65f45c | 2545 | static unsigned int |
502b8322 | 2546 | convert_to_eh_region_ranges (void) |
77d33a84 | 2547 | { |
f8b23302 DM |
2548 | rtx insn; |
2549 | rtx_insn *iter; | |
66e8df53 | 2550 | rtx_note *note; |
c203e8a7 | 2551 | action_hash_type ar_hash (31); |
52a11cbf | 2552 | int last_action = -3; |
f8b23302 | 2553 | rtx_insn *last_action_insn = NULL; |
52a11cbf | 2554 | rtx last_landing_pad = NULL_RTX; |
f8b23302 | 2555 | rtx_insn *first_no_action_insn = NULL; |
ae0ed63a | 2556 | int call_site = 0; |
17f6e37d | 2557 | int cur_sec = 0; |
e67d1102 | 2558 | rtx_insn *section_switch_note = NULL; |
f8b23302 DM |
2559 | rtx_insn *first_no_action_insn_before_switch = NULL; |
2560 | rtx_insn *last_no_action_insn_before_switch = NULL; | |
17f6e37d | 2561 | int saved_call_site_base = call_site_base; |
77d33a84 | 2562 | |
9771b263 | 2563 | vec_alloc (crtl->eh.action_record_data, 64); |
77d33a84 | 2564 | |
52a11cbf RH |
2565 | for (iter = get_insns (); iter ; iter = NEXT_INSN (iter)) |
2566 | if (INSN_P (iter)) | |
2567 | { | |
1d65f45c RH |
2568 | eh_landing_pad lp; |
2569 | eh_region region; | |
2570 | bool nothrow; | |
52a11cbf | 2571 | int this_action; |
e67d1102 | 2572 | rtx_code_label *this_landing_pad; |
77d33a84 | 2573 | |
52a11cbf | 2574 | insn = iter; |
4b4bf941 | 2575 | if (NONJUMP_INSN_P (insn) |
52a11cbf RH |
2576 | && GET_CODE (PATTERN (insn)) == SEQUENCE) |
2577 | insn = XVECEXP (PATTERN (insn), 0, 0); | |
1ef1bf06 | 2578 | |
1d65f45c RH |
2579 | nothrow = get_eh_region_and_lp_from_rtx (insn, ®ion, &lp); |
2580 | if (nothrow) | |
2581 | continue; | |
2582 | if (region) | |
c203e8a7 | 2583 | this_action = collect_one_action_chain (&ar_hash, region); |
52a11cbf | 2584 | else |
1d65f45c | 2585 | this_action = -1; |
52a11cbf RH |
2586 | |
2587 | /* Existence of catch handlers, or must-not-throw regions | |
2588 | implies that an lsda is needed (even if empty). */ | |
2589 | if (this_action != -1) | |
e3b5732b | 2590 | crtl->uses_eh_lsda = 1; |
52a11cbf RH |
2591 | |
2592 | /* Delay creation of region notes for no-action regions | |
2593 | until we're sure that an lsda will be required. */ | |
2594 | else if (last_action == -3) | |
2595 | { | |
2596 | first_no_action_insn = iter; | |
2597 | last_action = -1; | |
2598 | } | |
1ef1bf06 | 2599 | |
52a11cbf | 2600 | if (this_action >= 0) |
1d65f45c | 2601 | this_landing_pad = lp->landing_pad; |
52a11cbf | 2602 | else |
e67d1102 | 2603 | this_landing_pad = NULL; |
1ef1bf06 | 2604 | |
52a11cbf RH |
2605 | /* Differing actions or landing pads implies a change in call-site |
2606 | info, which implies some EH_REGION note should be emitted. */ | |
2607 | if (last_action != this_action | |
2608 | || last_landing_pad != this_landing_pad) | |
2609 | { | |
aaa52a96 JJ |
2610 | /* If there is a queued no-action region in the other section |
2611 | with hot/cold partitioning, emit it now. */ | |
2612 | if (first_no_action_insn_before_switch) | |
2613 | { | |
2614 | gcc_assert (this_action != -1 | |
2615 | && last_action == (first_no_action_insn | |
2616 | ? -1 : -3)); | |
2617 | call_site = add_call_site (NULL_RTX, 0, 0); | |
2618 | note = emit_note_before (NOTE_INSN_EH_REGION_BEG, | |
2619 | first_no_action_insn_before_switch); | |
2620 | NOTE_EH_HANDLER (note) = call_site; | |
a4a51a52 UB |
2621 | note |
2622 | = emit_note_eh_region_end (last_no_action_insn_before_switch); | |
aaa52a96 JJ |
2623 | NOTE_EH_HANDLER (note) = call_site; |
2624 | gcc_assert (last_action != -3 | |
2625 | || (last_action_insn | |
2626 | == last_no_action_insn_before_switch)); | |
f8b23302 DM |
2627 | first_no_action_insn_before_switch = NULL; |
2628 | last_no_action_insn_before_switch = NULL; | |
aaa52a96 JJ |
2629 | call_site_base++; |
2630 | } | |
52a11cbf RH |
2631 | /* If we'd not seen a previous action (-3) or the previous |
2632 | action was must-not-throw (-2), then we do not need an | |
2633 | end note. */ | |
2634 | if (last_action >= -1) | |
2635 | { | |
2636 | /* If we delayed the creation of the begin, do it now. */ | |
2637 | if (first_no_action_insn) | |
2638 | { | |
17f6e37d | 2639 | call_site = add_call_site (NULL_RTX, 0, cur_sec); |
52a11cbf RH |
2640 | note = emit_note_before (NOTE_INSN_EH_REGION_BEG, |
2641 | first_no_action_insn); | |
2642 | NOTE_EH_HANDLER (note) = call_site; | |
f8b23302 | 2643 | first_no_action_insn = NULL; |
52a11cbf RH |
2644 | } |
2645 | ||
a4a51a52 | 2646 | note = emit_note_eh_region_end (last_action_insn); |
52a11cbf RH |
2647 | NOTE_EH_HANDLER (note) = call_site; |
2648 | } | |
2649 | ||
2650 | /* If the new action is must-not-throw, then no region notes | |
2651 | are created. */ | |
2652 | if (this_action >= -1) | |
2653 | { | |
3f2c5d1a | 2654 | call_site = add_call_site (this_landing_pad, |
17f6e37d JJ |
2655 | this_action < 0 ? 0 : this_action, |
2656 | cur_sec); | |
52a11cbf RH |
2657 | note = emit_note_before (NOTE_INSN_EH_REGION_BEG, iter); |
2658 | NOTE_EH_HANDLER (note) = call_site; | |
2659 | } | |
2660 | ||
2661 | last_action = this_action; | |
2662 | last_landing_pad = this_landing_pad; | |
2663 | } | |
2664 | last_action_insn = iter; | |
2665 | } | |
17f6e37d JJ |
2666 | else if (NOTE_P (iter) |
2667 | && NOTE_KIND (iter) == NOTE_INSN_SWITCH_TEXT_SECTIONS) | |
2668 | { | |
2669 | gcc_assert (section_switch_note == NULL_RTX); | |
2670 | gcc_assert (flag_reorder_blocks_and_partition); | |
2671 | section_switch_note = iter; | |
2672 | if (first_no_action_insn) | |
2673 | { | |
2674 | first_no_action_insn_before_switch = first_no_action_insn; | |
2675 | last_no_action_insn_before_switch = last_action_insn; | |
f8b23302 | 2676 | first_no_action_insn = NULL; |
17f6e37d JJ |
2677 | gcc_assert (last_action == -1); |
2678 | last_action = -3; | |
2679 | } | |
2680 | /* Force closing of current EH region before section switch and | |
2681 | opening a new one afterwards. */ | |
2682 | else if (last_action != -3) | |
2683 | last_landing_pad = pc_rtx; | |
9771b263 DN |
2684 | if (crtl->eh.call_site_record_v[cur_sec]) |
2685 | call_site_base += crtl->eh.call_site_record_v[cur_sec]->length (); | |
17f6e37d | 2686 | cur_sec++; |
0823efed | 2687 | gcc_assert (crtl->eh.call_site_record_v[cur_sec] == NULL); |
9771b263 | 2688 | vec_alloc (crtl->eh.call_site_record_v[cur_sec], 10); |
17f6e37d | 2689 | } |
1ef1bf06 | 2690 | |
52a11cbf | 2691 | if (last_action >= -1 && ! first_no_action_insn) |
1ef1bf06 | 2692 | { |
a4a51a52 | 2693 | note = emit_note_eh_region_end (last_action_insn); |
52a11cbf | 2694 | NOTE_EH_HANDLER (note) = call_site; |
1ef1bf06 AM |
2695 | } |
2696 | ||
17f6e37d JJ |
2697 | call_site_base = saved_call_site_base; |
2698 | ||
c2924966 | 2699 | return 0; |
52a11cbf | 2700 | } |
1ef1bf06 | 2701 | |
27a4cd48 DM |
2702 | namespace { |
2703 | ||
2704 | const pass_data pass_data_convert_to_eh_region_ranges = | |
2705 | { | |
2706 | RTL_PASS, /* type */ | |
2707 | "eh_ranges", /* name */ | |
2708 | OPTGROUP_NONE, /* optinfo_flags */ | |
27a4cd48 DM |
2709 | TV_NONE, /* tv_id */ |
2710 | 0, /* properties_required */ | |
2711 | 0, /* properties_provided */ | |
2712 | 0, /* properties_destroyed */ | |
2713 | 0, /* todo_flags_start */ | |
2714 | 0, /* todo_flags_finish */ | |
ef330312 | 2715 | }; |
27a4cd48 DM |
2716 | |
2717 | class pass_convert_to_eh_region_ranges : public rtl_opt_pass | |
2718 | { | |
2719 | public: | |
c3284718 RS |
2720 | pass_convert_to_eh_region_ranges (gcc::context *ctxt) |
2721 | : rtl_opt_pass (pass_data_convert_to_eh_region_ranges, ctxt) | |
27a4cd48 DM |
2722 | {} |
2723 | ||
2724 | /* opt_pass methods: */ | |
725793af DM |
2725 | bool gate (function *) final override; |
2726 | unsigned int execute (function *) final override | |
be55bfe6 | 2727 | { |
205b6026 | 2728 | int ret = convert_to_eh_region_ranges (); |
3fa410c0 | 2729 | maybe_add_nop_after_section_switch (); |
205b6026 | 2730 | return ret; |
be55bfe6 | 2731 | } |
27a4cd48 DM |
2732 | |
2733 | }; // class pass_convert_to_eh_region_ranges | |
2734 | ||
1a3d085c TS |
2735 | bool |
2736 | pass_convert_to_eh_region_ranges::gate (function *) | |
2737 | { | |
2738 | /* Nothing to do for SJLJ exceptions or if no regions created. */ | |
2739 | if (cfun->eh->region_tree == NULL) | |
2740 | return false; | |
2741 | if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ) | |
2742 | return false; | |
2743 | return true; | |
2744 | } | |
2745 | ||
27a4cd48 DM |
2746 | } // anon namespace |
2747 | ||
2748 | rtl_opt_pass * | |
2749 | make_pass_convert_to_eh_region_ranges (gcc::context *ctxt) | |
2750 | { | |
2751 | return new pass_convert_to_eh_region_ranges (ctxt); | |
2752 | } | |
52a11cbf RH |
2753 | \f |
2754 | static void | |
9771b263 | 2755 | push_uleb128 (vec<uchar, va_gc> **data_area, unsigned int value) |
52a11cbf RH |
2756 | { |
2757 | do | |
2758 | { | |
2759 | unsigned char byte = value & 0x7f; | |
2760 | value >>= 7; | |
2761 | if (value) | |
2762 | byte |= 0x80; | |
9771b263 | 2763 | vec_safe_push (*data_area, byte); |
52a11cbf RH |
2764 | } |
2765 | while (value); | |
2766 | } | |
1ef1bf06 | 2767 | |
52a11cbf | 2768 | static void |
9771b263 | 2769 | push_sleb128 (vec<uchar, va_gc> **data_area, int value) |
52a11cbf RH |
2770 | { |
2771 | unsigned char byte; | |
2772 | int more; | |
1ef1bf06 | 2773 | |
52a11cbf | 2774 | do |
1ef1bf06 | 2775 | { |
52a11cbf RH |
2776 | byte = value & 0x7f; |
2777 | value >>= 7; | |
2778 | more = ! ((value == 0 && (byte & 0x40) == 0) | |
2779 | || (value == -1 && (byte & 0x40) != 0)); | |
2780 | if (more) | |
2781 | byte |= 0x80; | |
9771b263 | 2782 | vec_safe_push (*data_area, byte); |
1ef1bf06 | 2783 | } |
52a11cbf RH |
2784 | while (more); |
2785 | } | |
1ef1bf06 | 2786 | |
52a11cbf | 2787 | \f |
52a11cbf | 2788 | static int |
17f6e37d | 2789 | dw2_size_of_call_site_table (int section) |
1ef1bf06 | 2790 | { |
9771b263 | 2791 | int n = vec_safe_length (crtl->eh.call_site_record_v[section]); |
52a11cbf RH |
2792 | int size = n * (4 + 4 + 4); |
2793 | int i; | |
1ef1bf06 | 2794 | |
52a11cbf RH |
2795 | for (i = 0; i < n; ++i) |
2796 | { | |
7e5487a2 | 2797 | struct call_site_record_d *cs = |
9771b263 | 2798 | (*crtl->eh.call_site_record_v[section])[i]; |
52a11cbf RH |
2799 | size += size_of_uleb128 (cs->action); |
2800 | } | |
fac62ecf | 2801 | |
52a11cbf RH |
2802 | return size; |
2803 | } | |
2804 | ||
2805 | static int | |
502b8322 | 2806 | sjlj_size_of_call_site_table (void) |
52a11cbf | 2807 | { |
9771b263 | 2808 | int n = vec_safe_length (crtl->eh.call_site_record_v[0]); |
52a11cbf RH |
2809 | int size = 0; |
2810 | int i; | |
77d33a84 | 2811 | |
52a11cbf | 2812 | for (i = 0; i < n; ++i) |
1ef1bf06 | 2813 | { |
7e5487a2 | 2814 | struct call_site_record_d *cs = |
9771b263 | 2815 | (*crtl->eh.call_site_record_v[0])[i]; |
52a11cbf RH |
2816 | size += size_of_uleb128 (INTVAL (cs->landing_pad)); |
2817 | size += size_of_uleb128 (cs->action); | |
1ef1bf06 | 2818 | } |
52a11cbf RH |
2819 | |
2820 | return size; | |
2821 | } | |
52a11cbf RH |
2822 | |
2823 | static void | |
17f6e37d | 2824 | dw2_output_call_site_table (int cs_format, int section) |
52a11cbf | 2825 | { |
9771b263 | 2826 | int n = vec_safe_length (crtl->eh.call_site_record_v[section]); |
52a11cbf | 2827 | int i; |
17f6e37d JJ |
2828 | const char *begin; |
2829 | ||
2830 | if (section == 0) | |
2831 | begin = current_function_func_begin_label; | |
2832 | else if (first_function_block_is_cold) | |
2833 | begin = crtl->subsections.hot_section_label; | |
2834 | else | |
2835 | begin = crtl->subsections.cold_section_label; | |
52a11cbf RH |
2836 | |
2837 | for (i = 0; i < n; ++i) | |
1ef1bf06 | 2838 | { |
9771b263 | 2839 | struct call_site_record_d *cs = (*crtl->eh.call_site_record_v[section])[i]; |
52a11cbf RH |
2840 | char reg_start_lab[32]; |
2841 | char reg_end_lab[32]; | |
2842 | char landing_pad_lab[32]; | |
2843 | ||
2844 | ASM_GENERATE_INTERNAL_LABEL (reg_start_lab, "LEHB", call_site_base + i); | |
2845 | ASM_GENERATE_INTERNAL_LABEL (reg_end_lab, "LEHE", call_site_base + i); | |
2846 | ||
2847 | if (cs->landing_pad) | |
2848 | ASM_GENERATE_INTERNAL_LABEL (landing_pad_lab, "L", | |
2849 | CODE_LABEL_NUMBER (cs->landing_pad)); | |
2850 | ||
2851 | /* ??? Perhaps use insn length scaling if the assembler supports | |
2852 | generic arithmetic. */ | |
2853 | /* ??? Perhaps use attr_length to choose data1 or data2 instead of | |
2854 | data4 if the function is small enough. */ | |
17f6e37d JJ |
2855 | if (cs_format == DW_EH_PE_uleb128) |
2856 | { | |
2857 | dw2_asm_output_delta_uleb128 (reg_start_lab, begin, | |
2858 | "region %d start", i); | |
2859 | dw2_asm_output_delta_uleb128 (reg_end_lab, reg_start_lab, | |
2860 | "length"); | |
2861 | if (cs->landing_pad) | |
2862 | dw2_asm_output_delta_uleb128 (landing_pad_lab, begin, | |
2863 | "landing pad"); | |
2864 | else | |
2865 | dw2_asm_output_data_uleb128 (0, "landing pad"); | |
2866 | } | |
52a11cbf | 2867 | else |
17f6e37d JJ |
2868 | { |
2869 | dw2_asm_output_delta (4, reg_start_lab, begin, | |
2870 | "region %d start", i); | |
2871 | dw2_asm_output_delta (4, reg_end_lab, reg_start_lab, "length"); | |
2872 | if (cs->landing_pad) | |
2873 | dw2_asm_output_delta (4, landing_pad_lab, begin, | |
2874 | "landing pad"); | |
2875 | else | |
2876 | dw2_asm_output_data (4, 0, "landing pad"); | |
2877 | } | |
52a11cbf | 2878 | dw2_asm_output_data_uleb128 (cs->action, "action"); |
1ef1bf06 AM |
2879 | } |
2880 | ||
52a11cbf RH |
2881 | call_site_base += n; |
2882 | } | |
2883 | ||
2884 | static void | |
502b8322 | 2885 | sjlj_output_call_site_table (void) |
52a11cbf | 2886 | { |
9771b263 | 2887 | int n = vec_safe_length (crtl->eh.call_site_record_v[0]); |
52a11cbf | 2888 | int i; |
1ef1bf06 | 2889 | |
52a11cbf | 2890 | for (i = 0; i < n; ++i) |
1ef1bf06 | 2891 | { |
9771b263 | 2892 | struct call_site_record_d *cs = (*crtl->eh.call_site_record_v[0])[i]; |
4da896b2 | 2893 | |
52a11cbf RH |
2894 | dw2_asm_output_data_uleb128 (INTVAL (cs->landing_pad), |
2895 | "region %d landing pad", i); | |
2896 | dw2_asm_output_data_uleb128 (cs->action, "action"); | |
2897 | } | |
4da896b2 | 2898 | |
52a11cbf | 2899 | call_site_base += n; |
1ef1bf06 AM |
2900 | } |
2901 | ||
0f67af1c | 2902 | /* Switch to the section that should be used for exception tables. */ |
96d0f4dc | 2903 | |
0f67af1c | 2904 | static void |
22ba88ef | 2905 | switch_to_exception_section (const char * ARG_UNUSED (fnname)) |
96d0f4dc | 2906 | { |
55fc9e87 EB |
2907 | section *s; |
2908 | ||
2909 | if (exception_section) | |
2910 | s = exception_section; | |
2911 | else | |
96d0f4dc | 2912 | { |
04218b35 AD |
2913 | int flags; |
2914 | ||
2915 | if (EH_TABLES_CAN_BE_READ_ONLY) | |
2916 | { | |
2917 | int tt_format = | |
2918 | ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/0, /*global=*/1); | |
2919 | flags = ((! flag_pic | |
2920 | || ((tt_format & 0x70) != DW_EH_PE_absptr | |
2921 | && (tt_format & 0x70) != DW_EH_PE_aligned)) | |
2922 | ? 0 : SECTION_WRITE); | |
2923 | } | |
2924 | else | |
2925 | flags = SECTION_WRITE; | |
2926 | ||
55fc9e87 EB |
2927 | /* Compute the section and cache it into exception_section, |
2928 | unless it depends on the function name. */ | |
677f3fa8 | 2929 | if (targetm_common.have_named_sections) |
1a35e62d | 2930 | { |
22ba88ef | 2931 | #ifdef HAVE_LD_EH_GC_SECTIONS |
3e6011cf | 2932 | if (flag_function_sections |
cf288ed3 | 2933 | || (DECL_COMDAT_GROUP (current_function_decl) && HAVE_COMDAT_GROUP)) |
22ba88ef | 2934 | { |
1b4572a8 | 2935 | char *section_name = XNEWVEC (char, strlen (fnname) + 32); |
3e6011cf PB |
2936 | /* The EH table must match the code section, so only mark |
2937 | it linkonce if we have COMDAT groups to tie them together. */ | |
cf288ed3 | 2938 | if (DECL_COMDAT_GROUP (current_function_decl) && HAVE_COMDAT_GROUP) |
3e6011cf | 2939 | flags |= SECTION_LINKONCE; |
22ba88ef | 2940 | sprintf (section_name, ".gcc_except_table.%s", fnname); |
3e6011cf | 2941 | s = get_section (section_name, flags, current_function_decl); |
22ba88ef EB |
2942 | free (section_name); |
2943 | } | |
2944 | else | |
2945 | #endif | |
55fc9e87 EB |
2946 | exception_section |
2947 | = s = get_section (".gcc_except_table", flags, NULL); | |
1a35e62d MM |
2948 | } |
2949 | else | |
55fc9e87 | 2950 | exception_section |
04218b35 | 2951 | = s = flags == SECTION_WRITE ? data_section : readonly_data_section; |
96d0f4dc | 2952 | } |
55fc9e87 EB |
2953 | |
2954 | switch_to_section (s); | |
96d0f4dc JJ |
2955 | } |
2956 | ||
617a1b71 | 2957 | /* Output a reference from an exception table to the type_info object TYPE. |
6fc0bb99 | 2958 | TT_FORMAT and TT_FORMAT_SIZE describe the DWARF encoding method used for |
617a1b71 PB |
2959 | the value. */ |
2960 | ||
2961 | static void | |
2962 | output_ttype (tree type, int tt_format, int tt_format_size) | |
2963 | { | |
2964 | rtx value; | |
d858f359 | 2965 | bool is_public = true; |
617a1b71 PB |
2966 | |
2967 | if (type == NULL_TREE) | |
2968 | value = const0_rtx; | |
2969 | else | |
2970 | { | |
d7f09764 DN |
2971 | /* FIXME lto. pass_ipa_free_lang_data changes all types to |
2972 | runtime types so TYPE should already be a runtime type | |
2973 | reference. When pass_ipa_free_lang data is made a default | |
2974 | pass, we can then remove the call to lookup_type_for_runtime | |
2975 | below. */ | |
2976 | if (TYPE_P (type)) | |
2977 | type = lookup_type_for_runtime (type); | |
2978 | ||
cda5bf39 | 2979 | value = expand_expr (type, NULL_RTX, VOIDmode, EXPAND_INITIALIZER); |
617a1b71 PB |
2980 | |
2981 | /* Let cgraph know that the rtti decl is used. Not all of the | |
2982 | paths below go through assemble_integer, which would take | |
2983 | care of this for us. */ | |
2984 | STRIP_NOPS (type); | |
2985 | if (TREE_CODE (type) == ADDR_EXPR) | |
2986 | { | |
2987 | type = TREE_OPERAND (type, 0); | |
8813a647 | 2988 | if (VAR_P (type)) |
66058468 | 2989 | is_public = TREE_PUBLIC (type); |
617a1b71 | 2990 | } |
dd2c9f74 VR |
2991 | else |
2992 | gcc_assert (TREE_CODE (type) == INTEGER_CST); | |
617a1b71 PB |
2993 | } |
2994 | ||
2995 | /* Allow the target to override the type table entry format. */ | |
2996 | if (targetm.asm_out.ttype (value)) | |
2997 | return; | |
2998 | ||
2999 | if (tt_format == DW_EH_PE_absptr || tt_format == DW_EH_PE_aligned) | |
3000 | assemble_integer (value, tt_format_size, | |
3001 | tt_format_size * BITS_PER_UNIT, 1); | |
3002 | else | |
d858f359 | 3003 | dw2_asm_output_encoded_addr_rtx (tt_format, value, is_public, NULL); |
617a1b71 PB |
3004 | } |
3005 | ||
b78b513e EB |
3006 | /* Output an exception table for the current function according to SECTION. |
3007 | ||
3008 | If the function has been partitioned into hot and cold parts, value 0 for | |
3009 | SECTION refers to the table associated with the hot part while value 1 | |
3010 | refers to the table associated with the cold part. If the function has | |
3011 | not been partitioned, value 0 refers to the single exception table. */ | |
3012 | ||
17f6e37d | 3013 | static void |
a68b5e52 | 3014 | output_one_function_exception_table (int section) |
52a11cbf | 3015 | { |
1d65f45c | 3016 | int tt_format, cs_format, lp_format, i; |
52a11cbf RH |
3017 | char ttype_label[32]; |
3018 | char cs_after_size_label[32]; | |
3019 | char cs_end_label[32]; | |
52a11cbf | 3020 | int call_site_len; |
52a11cbf | 3021 | int have_tt_data; |
ae0ed63a | 3022 | int tt_format_size = 0; |
1ef1bf06 | 3023 | |
9771b263 | 3024 | have_tt_data = (vec_safe_length (cfun->eh->ttype_data) |
1d65f45c | 3025 | || (targetm.arm_eabi_unwinder |
9771b263 DN |
3026 | ? vec_safe_length (cfun->eh->ehspec_data.arm_eabi) |
3027 | : vec_safe_length (cfun->eh->ehspec_data.other))); | |
52a11cbf | 3028 | |
b627d6fe RH |
3029 | /* Indicate the format of the @TType entries. */ |
3030 | if (! have_tt_data) | |
3031 | tt_format = DW_EH_PE_omit; | |
3032 | else | |
3033 | { | |
3034 | tt_format = ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/0, /*global=*/1); | |
61214be1 TS |
3035 | if (HAVE_AS_LEB128) |
3036 | ASM_GENERATE_INTERNAL_LABEL (ttype_label, | |
3037 | section ? "LLSDATTC" : "LLSDATT", | |
3038 | current_function_funcdef_no); | |
3039 | ||
b627d6fe RH |
3040 | tt_format_size = size_of_encoded_value (tt_format); |
3041 | ||
7a900ebc | 3042 | assemble_align (tt_format_size * BITS_PER_UNIT); |
b627d6fe | 3043 | } |
52a11cbf | 3044 | |
17f6e37d JJ |
3045 | targetm.asm_out.internal_label (asm_out_file, section ? "LLSDAC" : "LLSDA", |
3046 | current_function_funcdef_no); | |
52a11cbf RH |
3047 | |
3048 | /* The LSDA header. */ | |
3049 | ||
3050 | /* Indicate the format of the landing pad start pointer. An omitted | |
3051 | field implies @LPStart == @Start. */ | |
3052 | /* Currently we always put @LPStart == @Start. This field would | |
3053 | be most useful in moving the landing pads completely out of | |
3054 | line to another section, but it could also be used to minimize | |
3055 | the size of uleb128 landing pad offsets. */ | |
2a1ee410 RH |
3056 | lp_format = DW_EH_PE_omit; |
3057 | dw2_asm_output_data (1, lp_format, "@LPStart format (%s)", | |
3058 | eh_data_format_name (lp_format)); | |
52a11cbf RH |
3059 | |
3060 | /* @LPStart pointer would go here. */ | |
3061 | ||
2a1ee410 RH |
3062 | dw2_asm_output_data (1, tt_format, "@TType format (%s)", |
3063 | eh_data_format_name (tt_format)); | |
52a11cbf | 3064 | |
61214be1 TS |
3065 | if (!HAVE_AS_LEB128) |
3066 | { | |
3067 | if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ) | |
3068 | call_site_len = sjlj_size_of_call_site_table (); | |
3069 | else | |
3070 | call_site_len = dw2_size_of_call_site_table (section); | |
3071 | } | |
52a11cbf RH |
3072 | |
3073 | /* A pc-relative 4-byte displacement to the @TType data. */ | |
3074 | if (have_tt_data) | |
3075 | { | |
61214be1 | 3076 | if (HAVE_AS_LEB128) |
1ef1bf06 | 3077 | { |
61214be1 TS |
3078 | char ttype_after_disp_label[32]; |
3079 | ASM_GENERATE_INTERNAL_LABEL (ttype_after_disp_label, | |
3080 | section ? "LLSDATTDC" : "LLSDATTD", | |
3081 | current_function_funcdef_no); | |
3082 | dw2_asm_output_delta_uleb128 (ttype_label, ttype_after_disp_label, | |
3083 | "@TType base offset"); | |
3084 | ASM_OUTPUT_LABEL (asm_out_file, ttype_after_disp_label); | |
1ef1bf06 | 3085 | } |
61214be1 TS |
3086 | else |
3087 | { | |
3088 | /* Ug. Alignment queers things. */ | |
3089 | unsigned int before_disp, after_disp, last_disp, disp; | |
3090 | ||
3091 | before_disp = 1 + 1; | |
3092 | after_disp = (1 + size_of_uleb128 (call_site_len) | |
3093 | + call_site_len | |
3094 | + vec_safe_length (crtl->eh.action_record_data) | |
3095 | + (vec_safe_length (cfun->eh->ttype_data) | |
3096 | * tt_format_size)); | |
3097 | ||
3098 | disp = after_disp; | |
3099 | do | |
3100 | { | |
3101 | unsigned int disp_size, pad; | |
52a11cbf | 3102 | |
61214be1 TS |
3103 | last_disp = disp; |
3104 | disp_size = size_of_uleb128 (disp); | |
3105 | pad = before_disp + disp_size + after_disp; | |
3106 | if (pad % tt_format_size) | |
3107 | pad = tt_format_size - (pad % tt_format_size); | |
3108 | else | |
3109 | pad = 0; | |
3110 | disp = after_disp + pad; | |
3111 | } | |
3112 | while (disp != last_disp); | |
3113 | ||
3114 | dw2_asm_output_data_uleb128 (disp, "@TType base offset"); | |
3115 | } | |
3116 | } | |
1ef1bf06 | 3117 | |
52a11cbf | 3118 | /* Indicate the format of the call-site offsets. */ |
61214be1 TS |
3119 | if (HAVE_AS_LEB128) |
3120 | cs_format = DW_EH_PE_uleb128; | |
3121 | else | |
3122 | cs_format = DW_EH_PE_udata4; | |
3123 | ||
2a1ee410 RH |
3124 | dw2_asm_output_data (1, cs_format, "call-site format (%s)", |
3125 | eh_data_format_name (cs_format)); | |
52a11cbf | 3126 | |
61214be1 TS |
3127 | if (HAVE_AS_LEB128) |
3128 | { | |
3129 | ASM_GENERATE_INTERNAL_LABEL (cs_after_size_label, | |
3130 | section ? "LLSDACSBC" : "LLSDACSB", | |
3131 | current_function_funcdef_no); | |
3132 | ASM_GENERATE_INTERNAL_LABEL (cs_end_label, | |
3133 | section ? "LLSDACSEC" : "LLSDACSE", | |
3134 | current_function_funcdef_no); | |
3135 | dw2_asm_output_delta_uleb128 (cs_end_label, cs_after_size_label, | |
3136 | "Call-site table length"); | |
3137 | ASM_OUTPUT_LABEL (asm_out_file, cs_after_size_label); | |
3138 | if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ) | |
3139 | sjlj_output_call_site_table (); | |
3140 | else | |
3141 | dw2_output_call_site_table (cs_format, section); | |
3142 | ASM_OUTPUT_LABEL (asm_out_file, cs_end_label); | |
3143 | } | |
52a11cbf | 3144 | else |
61214be1 TS |
3145 | { |
3146 | dw2_asm_output_data_uleb128 (call_site_len, "Call-site table length"); | |
3147 | if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ) | |
3148 | sjlj_output_call_site_table (); | |
3149 | else | |
3150 | dw2_output_call_site_table (cs_format, section); | |
3151 | } | |
52a11cbf RH |
3152 | |
3153 | /* ??? Decode and interpret the data for flag_debug_asm. */ | |
1d65f45c RH |
3154 | { |
3155 | uchar uc; | |
9771b263 | 3156 | FOR_EACH_VEC_ELT (*crtl->eh.action_record_data, i, uc) |
1d65f45c RH |
3157 | dw2_asm_output_data (1, uc, i ? NULL : "Action record table"); |
3158 | } | |
1ef1bf06 | 3159 | |
52a11cbf | 3160 | if (have_tt_data) |
7a900ebc | 3161 | assemble_align (tt_format_size * BITS_PER_UNIT); |
1ef1bf06 | 3162 | |
9771b263 | 3163 | i = vec_safe_length (cfun->eh->ttype_data); |
52a11cbf | 3164 | while (i-- > 0) |
1ef1bf06 | 3165 | { |
9771b263 | 3166 | tree type = (*cfun->eh->ttype_data)[i]; |
617a1b71 | 3167 | output_ttype (type, tt_format, tt_format_size); |
1ef1bf06 | 3168 | } |
52a11cbf | 3169 | |
61214be1 TS |
3170 | if (HAVE_AS_LEB128 && have_tt_data) |
3171 | ASM_OUTPUT_LABEL (asm_out_file, ttype_label); | |
52a11cbf RH |
3172 | |
3173 | /* ??? Decode and interpret the data for flag_debug_asm. */ | |
1d65f45c | 3174 | if (targetm.arm_eabi_unwinder) |
617a1b71 | 3175 | { |
1d65f45c RH |
3176 | tree type; |
3177 | for (i = 0; | |
9771b263 | 3178 | vec_safe_iterate (cfun->eh->ehspec_data.arm_eabi, i, &type); ++i) |
1d65f45c RH |
3179 | output_ttype (type, tt_format, tt_format_size); |
3180 | } | |
3181 | else | |
3182 | { | |
3183 | uchar uc; | |
3184 | for (i = 0; | |
9771b263 | 3185 | vec_safe_iterate (cfun->eh->ehspec_data.other, i, &uc); ++i) |
1d65f45c RH |
3186 | dw2_asm_output_data (1, uc, |
3187 | i ? NULL : "Exception specification table"); | |
617a1b71 | 3188 | } |
17f6e37d JJ |
3189 | } |
3190 | ||
b78b513e EB |
3191 | /* Output an exception table for the current function according to SECTION, |
3192 | switching back and forth from the function section appropriately. | |
3193 | ||
3194 | If the function has been partitioned into hot and cold parts, value 0 for | |
3195 | SECTION refers to the table associated with the hot part while value 1 | |
3196 | refers to the table associated with the cold part. If the function has | |
3197 | not been partitioned, value 0 refers to the single exception table. */ | |
3198 | ||
17f6e37d | 3199 | void |
b78b513e | 3200 | output_function_exception_table (int section) |
17f6e37d | 3201 | { |
b78b513e | 3202 | const char *fnname = get_fnname_from_decl (current_function_decl); |
f9417da1 RG |
3203 | rtx personality = get_personality_function (current_function_decl); |
3204 | ||
17f6e37d | 3205 | /* Not all functions need anything. */ |
d989dba8 TV |
3206 | if (!crtl->uses_eh_lsda |
3207 | || targetm_common.except_unwind_info (&global_options) == UI_NONE) | |
b78b513e EB |
3208 | return; |
3209 | ||
3210 | /* No need to emit any boilerplate stuff for the cold part. */ | |
3211 | if (section == 1 && !crtl->eh.call_site_record_v[1]) | |
17f6e37d JJ |
3212 | return; |
3213 | ||
f9417da1 | 3214 | if (personality) |
a68b5e52 RH |
3215 | { |
3216 | assemble_external_libcall (personality); | |
3217 | ||
3218 | if (targetm.asm_out.emit_except_personality) | |
3219 | targetm.asm_out.emit_except_personality (personality); | |
3220 | } | |
3221 | ||
3222 | switch_to_exception_section (fnname); | |
3223 | ||
3224 | /* If the target wants a label to begin the table, emit it here. */ | |
3225 | targetm.asm_out.emit_except_table_label (asm_out_file); | |
17f6e37d | 3226 | |
b78b513e EB |
3227 | /* Do the real work. */ |
3228 | output_one_function_exception_table (section); | |
52a11cbf | 3229 | |
d6b5193b | 3230 | switch_to_section (current_function_section ()); |
1ef1bf06 | 3231 | } |
e2500fed | 3232 | |
b4660e5a | 3233 | void |
355fe088 | 3234 | set_eh_throw_stmt_table (function *fun, hash_map<gimple *, int> *table) |
b4660e5a JH |
3235 | { |
3236 | fun->eh->throw_stmt_table = table; | |
3237 | } | |
3238 | ||
355fe088 | 3239 | hash_map<gimple *, int> * |
b4660e5a JH |
3240 | get_eh_throw_stmt_table (struct function *fun) |
3241 | { | |
3242 | return fun->eh->throw_stmt_table; | |
3243 | } | |
1d65f45c RH |
3244 | \f |
3245 | /* Determine if the function needs an EH personality function. */ | |
f9417da1 RG |
3246 | |
3247 | enum eh_personality_kind | |
3248 | function_needs_eh_personality (struct function *fn) | |
3249 | { | |
f9417da1 | 3250 | enum eh_personality_kind kind = eh_personality_none; |
1d65f45c | 3251 | eh_region i; |
f9417da1 | 3252 | |
1d65f45c | 3253 | FOR_ALL_EH_REGION_FN (i, fn) |
f9417da1 RG |
3254 | { |
3255 | switch (i->type) | |
3256 | { | |
f9417da1 RG |
3257 | case ERT_CLEANUP: |
3258 | /* Can do with any personality including the generic C one. */ | |
3259 | kind = eh_personality_any; | |
3260 | break; | |
3261 | ||
1d65f45c | 3262 | case ERT_TRY: |
f9417da1 RG |
3263 | case ERT_ALLOWED_EXCEPTIONS: |
3264 | /* Always needs a EH personality function. The generic C | |
3265 | personality doesn't handle these even for empty type lists. */ | |
3266 | return eh_personality_lang; | |
3267 | ||
1d65f45c RH |
3268 | case ERT_MUST_NOT_THROW: |
3269 | /* Always needs a EH personality function. The language may specify | |
3270 | what abort routine that must be used, e.g. std::terminate. */ | |
f9417da1 RG |
3271 | return eh_personality_lang; |
3272 | } | |
f9417da1 RG |
3273 | } |
3274 | ||
3275 | return kind; | |
3276 | } | |
1d65f45c | 3277 | \f |
cc7220fd | 3278 | /* Dump EH information to OUT. */ |
13a9fa44 | 3279 | |
083cad55 | 3280 | void |
13a9fa44 | 3281 | dump_eh_tree (FILE * out, struct function *fun) |
cc7220fd | 3282 | { |
1d65f45c | 3283 | eh_region i; |
cc7220fd | 3284 | int depth = 0; |
1d65f45c RH |
3285 | static const char *const type_name[] = { |
3286 | "cleanup", "try", "allowed_exceptions", "must_not_throw" | |
3287 | }; | |
cc7220fd JH |
3288 | |
3289 | i = fun->eh->region_tree; | |
13a9fa44 | 3290 | if (!i) |
cc7220fd JH |
3291 | return; |
3292 | ||
3293 | fprintf (out, "Eh tree:\n"); | |
3294 | while (1) | |
3295 | { | |
3296 | fprintf (out, " %*s %i %s", depth * 2, "", | |
1d65f45c RH |
3297 | i->index, type_name[(int) i->type]); |
3298 | ||
3299 | if (i->landing_pads) | |
0c0efb33 | 3300 | { |
1d65f45c RH |
3301 | eh_landing_pad lp; |
3302 | ||
3303 | fprintf (out, " land:"); | |
3304 | if (current_ir_type () == IR_GIMPLE) | |
3305 | { | |
3306 | for (lp = i->landing_pads; lp ; lp = lp->next_lp) | |
3307 | { | |
3308 | fprintf (out, "{%i,", lp->index); | |
ef6cb4c7 | 3309 | print_generic_expr (out, lp->post_landing_pad); |
1d65f45c RH |
3310 | fputc ('}', out); |
3311 | if (lp->next_lp) | |
3312 | fputc (',', out); | |
3313 | } | |
3314 | } | |
3315 | else | |
f645e9a2 | 3316 | { |
d7fde127 | 3317 | for (lp = i->landing_pads; lp ; lp = lp->next_lp) |
1d65f45c RH |
3318 | { |
3319 | fprintf (out, "{%i,", lp->index); | |
3320 | if (lp->landing_pad) | |
3321 | fprintf (out, "%i%s,", INSN_UID (lp->landing_pad), | |
3322 | NOTE_P (lp->landing_pad) ? "(del)" : ""); | |
3323 | else | |
3324 | fprintf (out, "(nil),"); | |
3325 | if (lp->post_landing_pad) | |
3326 | { | |
e67d1102 | 3327 | rtx_insn *lab = label_rtx (lp->post_landing_pad); |
1d65f45c RH |
3328 | fprintf (out, "%i%s}", INSN_UID (lab), |
3329 | NOTE_P (lab) ? "(del)" : ""); | |
3330 | } | |
3331 | else | |
3332 | fprintf (out, "(nil)}"); | |
3333 | if (lp->next_lp) | |
3334 | fputc (',', out); | |
3335 | } | |
f645e9a2 | 3336 | } |
0c0efb33 | 3337 | } |
1d65f45c | 3338 | |
13a9fa44 JH |
3339 | switch (i->type) |
3340 | { | |
3341 | case ERT_CLEANUP: | |
1d65f45c | 3342 | case ERT_MUST_NOT_THROW: |
13a9fa44 JH |
3343 | break; |
3344 | ||
3345 | case ERT_TRY: | |
3346 | { | |
1d65f45c RH |
3347 | eh_catch c; |
3348 | fprintf (out, " catch:"); | |
3349 | for (c = i->u.eh_try.first_catch; c; c = c->next_catch) | |
3350 | { | |
3351 | fputc ('{', out); | |
3352 | if (c->label) | |
3353 | { | |
3354 | fprintf (out, "lab:"); | |
ef6cb4c7 | 3355 | print_generic_expr (out, c->label); |
1d65f45c RH |
3356 | fputc (';', out); |
3357 | } | |
ef6cb4c7 | 3358 | print_generic_expr (out, c->type_list); |
1d65f45c RH |
3359 | fputc ('}', out); |
3360 | if (c->next_catch) | |
3361 | fputc (',', out); | |
3362 | } | |
13a9fa44 JH |
3363 | } |
3364 | break; | |
3365 | ||
13a9fa44 | 3366 | case ERT_ALLOWED_EXCEPTIONS: |
0c0efb33 | 3367 | fprintf (out, " filter :%i types:", i->u.allowed.filter); |
ef6cb4c7 | 3368 | print_generic_expr (out, i->u.allowed.type_list); |
13a9fa44 | 3369 | break; |
13a9fa44 | 3370 | } |
1d65f45c RH |
3371 | fputc ('\n', out); |
3372 | ||
cc7220fd JH |
3373 | /* If there are sub-regions, process them. */ |
3374 | if (i->inner) | |
3375 | i = i->inner, depth++; | |
3376 | /* If there are peers, process them. */ | |
3377 | else if (i->next_peer) | |
3378 | i = i->next_peer; | |
3379 | /* Otherwise, step back up the tree to the next peer. */ | |
3380 | else | |
3381 | { | |
13a9fa44 JH |
3382 | do |
3383 | { | |
3384 | i = i->outer; | |
3385 | depth--; | |
3386 | if (i == NULL) | |
3387 | return; | |
3388 | } | |
3389 | while (i->next_peer == NULL); | |
cc7220fd JH |
3390 | i = i->next_peer; |
3391 | } | |
3392 | } | |
3393 | } | |
3394 | ||
9994a182 DN |
3395 | /* Dump the EH tree for FN on stderr. */ |
3396 | ||
24e47c76 | 3397 | DEBUG_FUNCTION void |
9994a182 DN |
3398 | debug_eh_tree (struct function *fn) |
3399 | { | |
3400 | dump_eh_tree (stderr, fn); | |
3401 | } | |
3402 | ||
0c0efb33 JH |
3403 | /* Verify invariants on EH datastructures. */ |
3404 | ||
24e47c76 | 3405 | DEBUG_FUNCTION void |
cc7220fd JH |
3406 | verify_eh_tree (struct function *fun) |
3407 | { | |
1d65f45c RH |
3408 | eh_region r, outer; |
3409 | int nvisited_lp, nvisited_r; | |
3410 | int count_lp, count_r, depth, i; | |
3411 | eh_landing_pad lp; | |
cc7220fd | 3412 | bool err = false; |
cc7220fd | 3413 | |
98f358e5 | 3414 | if (!fun->eh->region_tree) |
cc7220fd | 3415 | return; |
1d65f45c RH |
3416 | |
3417 | count_r = 0; | |
9771b263 | 3418 | for (i = 1; vec_safe_iterate (fun->eh->region_array, i, &r); ++i) |
1d65f45c | 3419 | if (r) |
cc7220fd | 3420 | { |
1d65f45c RH |
3421 | if (r->index == i) |
3422 | count_r++; | |
3423 | else | |
cc7220fd | 3424 | { |
a9c697b8 | 3425 | error ("%<region_array%> is corrupted for region %i", r->index); |
cc7220fd JH |
3426 | err = true; |
3427 | } | |
3428 | } | |
3429 | ||
1d65f45c | 3430 | count_lp = 0; |
9771b263 | 3431 | for (i = 1; vec_safe_iterate (fun->eh->lp_array, i, &lp); ++i) |
1d65f45c RH |
3432 | if (lp) |
3433 | { | |
3434 | if (lp->index == i) | |
3435 | count_lp++; | |
3436 | else | |
3437 | { | |
a9c697b8 | 3438 | error ("%<lp_array%> is corrupted for lp %i", lp->index); |
1d65f45c RH |
3439 | err = true; |
3440 | } | |
3441 | } | |
3442 | ||
3443 | depth = nvisited_lp = nvisited_r = 0; | |
3444 | outer = NULL; | |
3445 | r = fun->eh->region_tree; | |
cc7220fd JH |
3446 | while (1) |
3447 | { | |
9771b263 | 3448 | if ((*fun->eh->region_array)[r->index] != r) |
cc7220fd | 3449 | { |
a9c697b8 | 3450 | error ("%<region_array%> is corrupted for region %i", r->index); |
cc7220fd JH |
3451 | err = true; |
3452 | } | |
1d65f45c | 3453 | if (r->outer != outer) |
cc7220fd | 3454 | { |
1d65f45c | 3455 | error ("outer block of region %i is wrong", r->index); |
cc7220fd JH |
3456 | err = true; |
3457 | } | |
1d65f45c | 3458 | if (depth < 0) |
cc7220fd | 3459 | { |
1d65f45c | 3460 | error ("negative nesting depth of region %i", r->index); |
cc7220fd JH |
3461 | err = true; |
3462 | } | |
1d65f45c RH |
3463 | nvisited_r++; |
3464 | ||
3465 | for (lp = r->landing_pads; lp ; lp = lp->next_lp) | |
cc7220fd | 3466 | { |
9771b263 | 3467 | if ((*fun->eh->lp_array)[lp->index] != lp) |
1d65f45c | 3468 | { |
a9c697b8 | 3469 | error ("%<lp_array%> is corrupted for lp %i", lp->index); |
1d65f45c RH |
3470 | err = true; |
3471 | } | |
3472 | if (lp->region != r) | |
3473 | { | |
3474 | error ("region of lp %i is wrong", lp->index); | |
3475 | err = true; | |
3476 | } | |
3477 | nvisited_lp++; | |
cc7220fd | 3478 | } |
1d65f45c RH |
3479 | |
3480 | if (r->inner) | |
3481 | outer = r, r = r->inner, depth++; | |
3482 | else if (r->next_peer) | |
3483 | r = r->next_peer; | |
cc7220fd JH |
3484 | else |
3485 | { | |
98f358e5 JH |
3486 | do |
3487 | { | |
1d65f45c RH |
3488 | r = r->outer; |
3489 | if (r == NULL) | |
3490 | goto region_done; | |
98f358e5 | 3491 | depth--; |
1d65f45c | 3492 | outer = r->outer; |
98f358e5 | 3493 | } |
1d65f45c RH |
3494 | while (r->next_peer == NULL); |
3495 | r = r->next_peer; | |
cc7220fd JH |
3496 | } |
3497 | } | |
1d65f45c RH |
3498 | region_done: |
3499 | if (depth != 0) | |
3500 | { | |
3501 | error ("tree list ends on depth %i", depth); | |
3502 | err = true; | |
3503 | } | |
3504 | if (count_r != nvisited_r) | |
3505 | { | |
a9c697b8 | 3506 | error ("%<region_array%> does not match %<region_tree%>"); |
1d65f45c RH |
3507 | err = true; |
3508 | } | |
3509 | if (count_lp != nvisited_lp) | |
3510 | { | |
a9c697b8 | 3511 | error ("%<lp_array%> does not match %<region_tree%>"); |
1d65f45c RH |
3512 | err = true; |
3513 | } | |
617a1b71 | 3514 | |
1d65f45c RH |
3515 | if (err) |
3516 | { | |
3517 | dump_eh_tree (stderr, fun); | |
a9c697b8 | 3518 | internal_error ("%qs failed", __func__); |
1d65f45c | 3519 | } |
617a1b71 | 3520 | } |
ef330312 | 3521 | \f |
e2500fed | 3522 | #include "gt-except.h" |