summaryrefslogtreecommitdiff
path: root/gcc/except.h
blob: 3fb33809d85741a86e42c6315ddc7f625b5cabbb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
/* Exception Handling interface routines.
   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   2007  Free Software Foundation, Inc.
   Contributed by Mike Stump <mrs@cygnus.com>.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */


struct function;

/* Per-function EH data.  Used only in except.c, but GC and others
   manipulate pointers to the opaque type.  */
struct eh_status;

/* Internal structure describing a region.  */
struct eh_region;

/* Test: is exception handling turned on?  */
extern int doing_eh (int);

/* Note that the current EH region (if any) may contain a throw, or a
   call to a function which itself may contain a throw.  */
extern void note_eh_region_may_contain_throw (struct eh_region *);
extern void note_current_region_may_contain_throw (void);

/* Invokes CALLBACK for every exception handler label.  Only used by old
   loop hackery; should not be used by new code.  */
extern void for_each_eh_label (void (*) (rtx));

/* Invokes CALLBACK for every exception region in the current function.  */
extern void for_each_eh_region (void (*) (struct eh_region *));

/* Determine if the given INSN can throw an exception.  */
extern bool can_throw_internal_1 (int, bool);
extern bool can_throw_internal (const_rtx);
extern bool can_throw_external_1 (int, bool);
extern bool can_throw_external (const_rtx);

/* Set TREE_NOTHROW and cfun->all_throwers_are_sibcalls.  */
extern unsigned int set_nothrow_function_flags (void);

/* After initial rtl generation, call back to finish generating
   exception support code.  */
extern void finish_eh_generation (void);

extern void init_eh (void);
extern void init_eh_for_function (void);

extern rtx reachable_handlers (rtx);
extern void maybe_remove_eh_handler (rtx);

extern void convert_from_eh_region_ranges (void);
extern unsigned int convert_to_eh_region_ranges (void);
extern void find_exception_handler_labels (void);
extern bool current_function_has_exception_handlers (void);
extern void output_function_exception_table (const char *);

extern void expand_builtin_unwind_init (void);
extern rtx expand_builtin_eh_return_data_regno (tree);
extern rtx expand_builtin_extract_return_addr (tree);
extern void expand_builtin_init_dwarf_reg_sizes (tree);
extern rtx expand_builtin_frob_return_addr (tree);
extern rtx expand_builtin_dwarf_sp_column (void);
extern void expand_builtin_eh_return (tree, tree);
extern void expand_eh_return (void);
extern rtx expand_builtin_extend_pointer (tree);
extern rtx get_exception_pointer (struct function *);
extern rtx get_exception_filter (struct function *);
typedef tree (*duplicate_eh_regions_map) (tree, void *);
extern int duplicate_eh_regions (struct function *, duplicate_eh_regions_map,
				 void *, int, int);

extern void sjlj_emit_function_exit_after (rtx);
extern void default_init_unwind_resume_libfunc (void);

extern struct eh_region *gen_eh_region_cleanup (struct eh_region *,
						struct eh_region *);
extern struct eh_region *gen_eh_region_try (struct eh_region *);
extern struct eh_region *gen_eh_region_catch (struct eh_region *, tree);
extern struct eh_region *gen_eh_region_allowed (struct eh_region *, tree);
extern struct eh_region *gen_eh_region_must_not_throw (struct eh_region *);
extern int get_eh_region_number (struct eh_region *);
extern bool get_eh_region_may_contain_throw (struct eh_region *);
extern tree get_eh_region_tree_label (struct eh_region *);
extern void set_eh_region_tree_label (struct eh_region *, tree);

extern void foreach_reachable_handler (int, bool,
				       void (*) (struct eh_region *, void *),
				       void *);

extern void collect_eh_region_array (void);
extern void expand_resx_expr (tree);
extern void verify_eh_tree (struct function *);
extern void dump_eh_tree (FILE *, struct function *);
extern bool eh_region_outer_p (struct function *, int, int);
extern int eh_region_outermost (struct function *, int, int);

/* tree-eh.c */
extern void add_stmt_to_eh_region_fn (struct function *, tree, int);
extern bool remove_stmt_from_eh_region_fn (struct function *, tree);
extern int lookup_stmt_eh_region_fn (struct function *, const_tree);
extern int lookup_stmt_eh_region (const_tree);
extern bool verify_eh_edges (tree);

/* If non-NULL, this is a function that returns an expression to be
   executed if an unhandled exception is propagated out of a cleanup
   region.  For example, in C++, an exception thrown by a destructor
   during stack unwinding is required to result in a call to
   `std::terminate', so the C++ version of this function returns a
   CALL_EXPR for `std::terminate'.  */
extern tree (*lang_protect_cleanup_actions) (void);

/* Return true if type A catches type B.  */
extern int (*lang_eh_type_covers) (tree a, tree b);

/* Map a type to a runtime object to match type.  */
extern tree (*lang_eh_runtime_type) (tree);


/* Just because the user configured --with-sjlj-exceptions=no doesn't
   mean that we can use call frame exceptions.  Detect that the target
   has appropriate support.  */

#ifndef MUST_USE_SJLJ_EXCEPTIONS
# if !(defined (EH_RETURN_DATA_REGNO)			\
       && (defined (TARGET_UNWIND_INFO)			\
	   || (DWARF2_UNWIND_INFO			\
	       && (defined (EH_RETURN_HANDLER_RTX)	\
		   || defined (HAVE_eh_return)))))
#  define MUST_USE_SJLJ_EXCEPTIONS	1
# else
#  define MUST_USE_SJLJ_EXCEPTIONS	0
# endif
#endif

#ifdef CONFIG_SJLJ_EXCEPTIONS
# if CONFIG_SJLJ_EXCEPTIONS == 1
#  define USING_SJLJ_EXCEPTIONS		1
# endif
# if CONFIG_SJLJ_EXCEPTIONS == 0
#  define USING_SJLJ_EXCEPTIONS		0
#  ifndef EH_RETURN_DATA_REGNO
    #error "EH_RETURN_DATA_REGNO required"
#  endif
#  if !defined(EH_RETURN_HANDLER_RTX) && !defined(HAVE_eh_return)
    #error "EH_RETURN_HANDLER_RTX or eh_return required"
#  endif
#  if !defined(DWARF2_UNWIND_INFO) && !defined(TARGET_UNWIND_INFO)
    #error "{DWARF2,TARGET}_UNWIND_INFO required"
#  endif
# endif
#else
# define USING_SJLJ_EXCEPTIONS		MUST_USE_SJLJ_EXCEPTIONS
#endif

struct throw_stmt_node GTY(())
{
  tree stmt;
  int region_nr;
};

extern struct htab *get_eh_throw_stmt_table (struct function *);
extern void set_eh_throw_stmt_table (struct function *, struct htab *);