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4956d07c | 1 | /* Exception Handling interface routines. |
a2130901 | 2 | Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 |
02d208ff | 3 | Free Software Foundation, Inc. |
4956d07c MS |
4 | Contributed by Mike Stump <mrs@cygnus.com>. |
5 | ||
1322177d | 6 | This file is part of GCC. |
4956d07c | 7 | |
1322177d LB |
8 | GCC is free software; you can redistribute it and/or modify it under |
9 | the terms of the GNU General Public License as published by the Free | |
10 | Software Foundation; either version 2, or (at your option) any later | |
11 | version. | |
4956d07c | 12 | |
1322177d LB |
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
4956d07c MS |
17 | |
18 | You should have received a copy of the GNU General Public License | |
1322177d | 19 | along with GCC; see the file COPYING. If not, write to the Free |
366ccddb KC |
20 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
21 | 02110-1301, USA. */ | |
4956d07c | 22 | |
9a0d1e1b | 23 | |
f9f6b7df GS |
24 | struct function; |
25 | ||
52a11cbf RH |
26 | /* Per-function EH data. Used only in except.c, but GC and others |
27 | manipulate pointers to the opaque type. */ | |
28 | struct eh_status; | |
911fdd58 | 29 | |
52a11cbf RH |
30 | /* Internal structure describing a region. */ |
31 | struct eh_region; | |
ce152ef8 | 32 | |
52a11cbf | 33 | /* Test: is exception handling turned on? */ |
502b8322 | 34 | extern int doing_eh (int); |
ce152ef8 | 35 | |
b2dd096b MM |
36 | /* Note that the current EH region (if any) may contain a throw, or a |
37 | call to a function which itself may contain a throw. */ | |
6de9cd9a DN |
38 | extern void note_eh_region_may_contain_throw (struct eh_region *); |
39 | extern void note_current_region_may_contain_throw (void); | |
b2dd096b | 40 | |
6a58eee9 RH |
41 | /* Invokes CALLBACK for every exception handler label. Only used by old |
42 | loop hackery; should not be used by new code. */ | |
502b8322 | 43 | extern void for_each_eh_label (void (*) (rtx)); |
4956d07c | 44 | |
f698d217 SB |
45 | /* Invokes CALLBACK for every exception region in the current function. */ |
46 | extern void for_each_eh_region (void (*) (struct eh_region *)); | |
47 | ||
0519ce30 | 48 | /* Determine if the given INSN can throw an exception. */ |
b59fa6cf | 49 | extern bool can_throw_internal_1 (int, bool); |
502b8322 | 50 | extern bool can_throw_internal (rtx); |
b59fa6cf | 51 | extern bool can_throw_external_1 (int, bool); |
502b8322 | 52 | extern bool can_throw_external (rtx); |
0519ce30 | 53 | |
97b0ade3 | 54 | /* Set TREE_NOTHROW and cfun->all_throwers_are_sibcalls. */ |
c2924966 | 55 | extern unsigned int set_nothrow_function_flags (void); |
fb13d4d0 | 56 | |
52a11cbf RH |
57 | /* After initial rtl generation, call back to finish generating |
58 | exception support code. */ | |
502b8322 | 59 | extern void finish_eh_generation (void); |
fb13d4d0 | 60 | |
502b8322 AJ |
61 | extern void init_eh (void); |
62 | extern void init_eh_for_function (void); | |
911fdd58 | 63 | |
502b8322 AJ |
64 | extern rtx reachable_handlers (rtx); |
65 | extern void maybe_remove_eh_handler (rtx); | |
e976b8b2 | 66 | |
502b8322 | 67 | extern void convert_from_eh_region_ranges (void); |
c2924966 | 68 | extern unsigned int convert_to_eh_region_ranges (void); |
502b8322 AJ |
69 | extern void find_exception_handler_labels (void); |
70 | extern bool current_function_has_exception_handlers (void); | |
71 | extern void output_function_exception_table (void); | |
154bba13 | 72 | |
502b8322 AJ |
73 | extern void expand_builtin_unwind_init (void); |
74 | extern rtx expand_builtin_eh_return_data_regno (tree); | |
75 | extern rtx expand_builtin_extract_return_addr (tree); | |
76 | extern void expand_builtin_init_dwarf_reg_sizes (tree); | |
77 | extern rtx expand_builtin_frob_return_addr (tree); | |
78 | extern rtx expand_builtin_dwarf_sp_column (void); | |
79 | extern void expand_builtin_eh_return (tree, tree); | |
80 | extern void expand_eh_return (void); | |
c76362b4 | 81 | extern rtx expand_builtin_extend_pointer (tree); |
502b8322 | 82 | extern rtx get_exception_pointer (struct function *); |
6de9cd9a | 83 | extern rtx get_exception_filter (struct function *); |
98f464e0 | 84 | typedef tree (*duplicate_eh_regions_map) (tree, void *); |
fad41cd7 RH |
85 | extern int duplicate_eh_regions (struct function *, duplicate_eh_regions_map, |
86 | void *, int, int); | |
e976b8b2 | 87 | |
502b8322 | 88 | extern void sjlj_emit_function_exit_after (rtx); |
617a1b71 | 89 | extern void default_init_unwind_resume_libfunc (void); |
e976b8b2 | 90 | |
6de9cd9a DN |
91 | extern struct eh_region *gen_eh_region_cleanup (struct eh_region *, |
92 | struct eh_region *); | |
93 | extern struct eh_region *gen_eh_region_try (struct eh_region *); | |
94 | extern struct eh_region *gen_eh_region_catch (struct eh_region *, tree); | |
95 | extern struct eh_region *gen_eh_region_allowed (struct eh_region *, tree); | |
96 | extern struct eh_region *gen_eh_region_must_not_throw (struct eh_region *); | |
97 | extern int get_eh_region_number (struct eh_region *); | |
98 | extern bool get_eh_region_may_contain_throw (struct eh_region *); | |
99 | extern tree get_eh_region_tree_label (struct eh_region *); | |
100 | extern void set_eh_region_tree_label (struct eh_region *, tree); | |
101 | ||
102 | extern void foreach_reachable_handler (int, bool, | |
103 | void (*) (struct eh_region *, void *), | |
104 | void *); | |
105 | ||
106 | extern void collect_eh_region_array (void); | |
107 | extern void expand_resx_expr (tree); | |
cc7220fd JH |
108 | extern void verify_eh_tree (struct function *); |
109 | extern void dump_eh_tree (FILE *, struct function *); | |
fad41cd7 | 110 | extern bool eh_region_outer_p (struct function *, int, int); |
7e2df4a1 | 111 | extern int eh_region_outermost (struct function *, int, int); |
6de9cd9a DN |
112 | |
113 | /* tree-eh.c */ | |
b4660e5a JH |
114 | extern void add_stmt_to_eh_region_fn (struct function *, tree, int); |
115 | extern bool remove_stmt_from_eh_region_fn (struct function *, tree); | |
116 | extern int lookup_stmt_eh_region_fn (struct function *, tree); | |
6de9cd9a | 117 | extern int lookup_stmt_eh_region (tree); |
cc7220fd | 118 | extern bool verify_eh_edges (tree); |
f54a7f6f | 119 | |
e6855a2d | 120 | /* If non-NULL, this is a function that returns an expression to be |
a1f300c0 | 121 | executed if an unhandled exception is propagated out of a cleanup |
e6855a2d MM |
122 | region. For example, in C++, an exception thrown by a destructor |
123 | during stack unwinding is required to result in a call to | |
124 | `std::terminate', so the C++ version of this function returns a | |
125 | CALL_EXPR for `std::terminate'. */ | |
502b8322 | 126 | extern tree (*lang_protect_cleanup_actions) (void); |
f54a7f6f | 127 | |
52a11cbf | 128 | /* Return true if type A catches type B. */ |
502b8322 | 129 | extern int (*lang_eh_type_covers) (tree a, tree b); |
e976b8b2 | 130 | |
52a11cbf | 131 | /* Map a type to a runtime object to match type. */ |
502b8322 | 132 | extern tree (*lang_eh_runtime_type) (tree); |
e976b8b2 | 133 | |
531073e7 RH |
134 | |
135 | /* Just because the user configured --with-sjlj-exceptions=no doesn't | |
136 | mean that we can use call frame exceptions. Detect that the target | |
137 | has appropriate support. */ | |
138 | ||
c14aea87 RO |
139 | #ifndef MUST_USE_SJLJ_EXCEPTIONS |
140 | # if !(defined (EH_RETURN_DATA_REGNO) \ | |
951120ea | 141 | && (defined (TARGET_UNWIND_INFO) \ |
84fc8b47 | 142 | || (DWARF2_UNWIND_INFO \ |
2a1ee410 RH |
143 | && (defined (EH_RETURN_HANDLER_RTX) \ |
144 | || defined (HAVE_eh_return))))) | |
c14aea87 | 145 | # define MUST_USE_SJLJ_EXCEPTIONS 1 |
5748beec | 146 | # else |
c14aea87 | 147 | # define MUST_USE_SJLJ_EXCEPTIONS 0 |
5748beec | 148 | # endif |
52a11cbf RH |
149 | #endif |
150 | ||
531073e7 RH |
151 | #ifdef CONFIG_SJLJ_EXCEPTIONS |
152 | # if CONFIG_SJLJ_EXCEPTIONS == 1 | |
153 | # define USING_SJLJ_EXCEPTIONS 1 | |
154 | # endif | |
155 | # if CONFIG_SJLJ_EXCEPTIONS == 0 | |
156 | # define USING_SJLJ_EXCEPTIONS 0 | |
52a11cbf RH |
157 | # ifndef EH_RETURN_DATA_REGNO |
158 | #error "EH_RETURN_DATA_REGNO required" | |
159 | # endif | |
52a11cbf RH |
160 | # if !defined(EH_RETURN_HANDLER_RTX) && !defined(HAVE_eh_return) |
161 | #error "EH_RETURN_HANDLER_RTX or eh_return required" | |
162 | # endif | |
951120ea PB |
163 | # if !defined(DWARF2_UNWIND_INFO) && !defined(TARGET_UNWIND_INFO) |
164 | #error "{DWARF2,TARGET}_UNWIND_INFO required" | |
531073e7 RH |
165 | # endif |
166 | # endif | |
167 | #else | |
52a11cbf | 168 | # define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS |
531073e7 | 169 | #endif |
b4660e5a JH |
170 | |
171 | struct throw_stmt_node GTY(()) | |
172 | { | |
173 | tree stmt; | |
174 | int region_nr; | |
175 | }; | |
176 | ||
177 | extern struct htab *get_eh_throw_stmt_table (struct function *); | |
178 | extern void set_eh_throw_stmt_table (struct function *, struct htab *); | |
736432ee JL |
179 | |
180 | #ifdef ENABLE_CHECKING | |
181 | extern void verify_eh_throw_table_statements (void); | |
182 | #endif |