111
|
1 /* Source locations within string literals.
|
|
2 Copyright (C) 2016-2017 Free Software Foundation, Inc.
|
|
3
|
|
4 This file is part of GCC.
|
|
5
|
|
6 GCC is free software; you can redistribute it and/or modify it under
|
|
7 the terms of the GNU General Public License as published by the Free
|
|
8 Software Foundation; either version 3, or (at your option) any later
|
|
9 version.
|
|
10
|
|
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
14 for more details.
|
|
15
|
|
16 You should have received a copy of the GNU General Public License
|
|
17 along with GCC; see the file COPYING3. If not see
|
|
18 <http://www.gnu.org/licenses/>. */
|
|
19
|
|
20 #ifndef GCC_SUBSTRING_LOCATIONS_H
|
|
21 #define GCC_SUBSTRING_LOCATIONS_H
|
|
22
|
|
23 /* The substring_loc class encapsulates information on the source location
|
|
24 of a range of characters within a STRING_CST.
|
|
25
|
|
26 If needed by a diagnostic, the actual location_t of the substring_loc
|
|
27 can be calculated by calling its get_location method. This calls a
|
|
28 langhook, since this is inherently frontend-specific. For the C family
|
|
29 of frontends, it calls back into libcpp to reparse the strings. This
|
|
30 gets the location information "on demand", rather than storing the
|
|
31 location information in the initial lex for every string. Thus the
|
|
32 substring_loc can also be thought of as a deferred call into libcpp,
|
|
33 to allow the non-trivial work of reparsing the string to be delayed
|
|
34 until we actually need it (to emit a diagnostic for a particular range
|
|
35 of characters).
|
|
36
|
|
37 substring_loc::get_location returns NULL if it succeeds, or an
|
|
38 error message if it fails. Error messages are intended for GCC
|
|
39 developers (to help debugging) rather than for end-users.
|
|
40
|
|
41 The easiest way to use a substring_loc is via the format_warning_* APIs,
|
|
42 which gracefully handle failure of substring_loc::get_location by using
|
|
43 the location of the string as a whole if substring-information is
|
|
44 unavailable. */
|
|
45
|
|
46 class substring_loc
|
|
47 {
|
|
48 public:
|
|
49 /* Constructor. FMT_STRING_LOC is the location of the string as
|
|
50 a whole. STRING_TYPE is the type of the string. It should be an
|
|
51 ARRAY_TYPE of INTEGER_TYPE, or a POINTER_TYPE to such an ARRAY_TYPE.
|
|
52 CARET_IDX, START_IDX, and END_IDX are offsets from the start
|
|
53 of the string data. */
|
|
54 substring_loc (location_t fmt_string_loc, tree string_type,
|
|
55 int caret_idx, int start_idx, int end_idx)
|
|
56 : m_fmt_string_loc (fmt_string_loc), m_string_type (string_type),
|
|
57 m_caret_idx (caret_idx), m_start_idx (start_idx), m_end_idx (end_idx) {}
|
|
58
|
|
59 void set_caret_index (int caret_idx) { m_caret_idx = caret_idx; }
|
|
60
|
|
61 const char *get_location (location_t *out_loc) const;
|
|
62
|
|
63 location_t get_fmt_string_loc () const { return m_fmt_string_loc; }
|
|
64 tree get_string_type () const { return m_string_type; }
|
|
65 int get_caret_idx () const { return m_caret_idx; }
|
|
66 int get_start_idx () const { return m_start_idx; }
|
|
67 int get_end_idx () const { return m_end_idx; }
|
|
68
|
|
69 private:
|
|
70 location_t m_fmt_string_loc;
|
|
71 tree m_string_type;
|
|
72 int m_caret_idx;
|
|
73 int m_start_idx;
|
|
74 int m_end_idx;
|
|
75 };
|
|
76
|
|
77 /* Functions for emitting a warning about a format string. */
|
|
78
|
|
79 extern bool format_warning_va (const substring_loc &fmt_loc,
|
|
80 location_t param_loc,
|
|
81 const char *corrected_substring,
|
|
82 int opt, const char *gmsgid, va_list *ap)
|
|
83 ATTRIBUTE_GCC_DIAG (5,0);
|
|
84
|
|
85 extern bool format_warning_at_substring (const substring_loc &fmt_loc,
|
|
86 location_t param_loc,
|
|
87 const char *corrected_substring,
|
|
88 int opt, const char *gmsgid, ...)
|
|
89 ATTRIBUTE_GCC_DIAG (5,0);
|
|
90
|
|
91 /* Implementation detail, for use when implementing
|
|
92 LANG_HOOKS_GET_SUBSTRING_LOCATION. */
|
|
93
|
|
94 extern const char *get_source_location_for_substring (cpp_reader *pfile,
|
|
95 string_concat_db *concats,
|
|
96 location_t strloc,
|
|
97 enum cpp_ttype type,
|
|
98 int caret_idx,
|
|
99 int start_idx, int end_idx,
|
|
100 location_t *out_loc);
|
|
101
|
|
102 #endif /* ! GCC_SUBSTRING_LOCATIONS_H */
|