| /* Check calls to formatted I/O functions (-Wformat). |
| Copyright (C) 1992-2019 Free Software Foundation, Inc. |
| |
| 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/>. */ |
| |
| #ifndef GCC_C_FORMAT_H |
| #define GCC_C_FORMAT_H |
| |
| /* The meaningfully distinct length modifiers for format checking recognized |
| by GCC. */ |
| enum format_lengths |
| { |
| FMT_LEN_none, |
| FMT_LEN_hh, |
| FMT_LEN_h, |
| FMT_LEN_l, |
| FMT_LEN_ll, |
| FMT_LEN_L, |
| FMT_LEN_z, |
| FMT_LEN_t, |
| FMT_LEN_j, |
| FMT_LEN_H, |
| FMT_LEN_D, |
| FMT_LEN_DD, |
| FMT_LEN_MAX |
| }; |
| |
| |
| /* The standard versions in which various format features appeared. */ |
| enum format_std_version |
| { |
| STD_C89, |
| STD_C94, |
| STD_C9L, /* C99, but treat as C89 if -Wno-long-long. */ |
| STD_C99, |
| STD_EXT |
| }; |
| |
| /* Flags that may apply to a particular kind of format checked by GCC. */ |
| enum |
| { |
| /* This format converts arguments of types determined by the |
| format string. */ |
| FMT_FLAG_ARG_CONVERT = 1, |
| /* The scanf allocation 'a' kludge applies to this format kind. */ |
| FMT_FLAG_SCANF_A_KLUDGE = 2, |
| /* A % during parsing a specifier is allowed to be a modified % rather |
| that indicating the format is broken and we are out-of-sync. */ |
| FMT_FLAG_FANCY_PERCENT_OK = 4, |
| /* With $ operand numbers, it is OK to reference the same argument more |
| than once. */ |
| FMT_FLAG_DOLLAR_MULTIPLE = 8, |
| /* This format type uses $ operand numbers (strfmon doesn't). */ |
| FMT_FLAG_USE_DOLLAR = 16, |
| /* Zero width is bad in this type of format (scanf). */ |
| FMT_FLAG_ZERO_WIDTH_BAD = 32, |
| /* Empty precision specification is OK in this type of format (printf). */ |
| FMT_FLAG_EMPTY_PREC_OK = 64, |
| /* Gaps are allowed in the arguments with $ operand numbers if all |
| arguments are pointers (scanf). */ |
| FMT_FLAG_DOLLAR_GAP_POINTER_OK = 128, |
| /* The format arg is an opaque object that will be parsed by an external |
| facility. */ |
| FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL = 256 |
| /* Not included here: details of whether width or precision may occur |
| (controlled by width_char and precision_char); details of whether |
| '*' can be used for these (width_type and precision_type); details |
| of whether length modifiers can occur (length_char_specs). */ |
| }; |
| |
| /* Structure describing a length modifier supported in format checking, and |
| possibly a doubled version such as "hh". */ |
| struct format_length_info |
| { |
| /* Name of the single-character length modifier. If prefixed by |
| a zero character, it describes a multi character length |
| modifier, like I64, I32, etc. */ |
| const char *name; |
| /* Index into a format_char_info.types array. */ |
| enum format_lengths index; |
| /* Standard version this length appears in. */ |
| enum format_std_version std; |
| /* Same, if the modifier can be repeated, or NULL if it can't. */ |
| const char *double_name; |
| enum format_lengths double_index; |
| enum format_std_version double_std; |
| |
| /* If this flag is set, just scalar width identity is checked, and |
| not the type identity itself. */ |
| int scalar_identity_flag; |
| }; |
| |
| |
| /* Structure describing the combination of a conversion specifier |
| (or a set of specifiers which act identically) and a length modifier. */ |
| struct format_type_detail |
| { |
| /* The standard version this combination of length and type appeared in. |
| This is only relevant if greater than those for length and type |
| individually; otherwise it is ignored. */ |
| enum format_std_version std; |
| /* The name to use for the type, if different from that generated internally |
| (e.g., "signed size_t"). */ |
| const char *name; |
| /* The type itself. */ |
| tree *type; |
| }; |
| |
| |
| /* Macros to fill out tables of these. */ |
| #define NOARGUMENTS { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN } |
| #define BADLEN { STD_C89, NULL, NULL } |
| #define NOLENGTHS { BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN } |
| |
| |
| /* Structure describing a format conversion specifier (or a set of specifiers |
| which act identically), and the length modifiers used with it. */ |
| struct format_char_info |
| { |
| const char *format_chars; |
| int pointer_count; |
| enum format_std_version std; |
| /* Types accepted for each length modifier. */ |
| format_type_detail types[FMT_LEN_MAX]; |
| /* List of other modifier characters allowed with these specifiers. |
| This lists flags, and additionally "w" for width, "p" for precision |
| (right precision, for strfmon), "#" for left precision (strfmon), |
| "a" for scanf "a" allocation extension (not applicable in C99 mode), |
| "*" for scanf suppression, and "E" and "O" for those strftime |
| modifiers. */ |
| const char *flag_chars; |
| /* List of additional flags describing these conversion specifiers. |
| "c" for generic character pointers being allowed, "2" for strftime |
| two digit year formats, "3" for strftime formats giving two digit |
| years in some locales, "4" for "2" which becomes "3" with an "E" modifier, |
| "o" if use of strftime "O" is a GNU extension beyond C99, |
| "W" if the argument is a pointer which is dereferenced and written into, |
| "R" if the argument is a pointer which is dereferenced and read from, |
| "i" for printf integer formats where the '0' flag is ignored with |
| precision, and "[" for the starting character of a scanf scanset, |
| "<" if the specifier introduces a quoted sequence (such as "%<"), |
| ">" if the specifier terminates a quoted sequence (such as "%>"), |
| "[" if the specifier introduces a color sequence (such as "%r"), |
| "]" if the specifier terminates a color sequence (such as "%R"), |
| "'" (single quote) if the specifier is expected to be quoted when |
| it appears outside a quoted sequence and unquoted otherwise (such |
| as the GCC internal printf format directive "%T"), and |
| "\"" (double quote) if the specifier is not expected to appear in |
| a quoted sequence (such as the GCC internal format directive "%K". */ |
| const char *flags2; |
| /* If this format conversion character consumes more than one argument, |
| CHAIN points to information about the next argument. For later |
| arguments, only POINTER_COUNT, TYPES, and the "c", "R", and "W" flags |
| in FLAGS2 are used. */ |
| const struct format_char_info *chain; |
| }; |
| |
| |
| /* Structure describing a flag accepted by some kind of format. */ |
| struct format_flag_spec |
| { |
| /* The flag character in question (0 for end of array). */ |
| int flag_char; |
| /* Zero if this entry describes the flag character in general, or a |
| nonzero character that may be found in flags2 if it describes the |
| flag when used with certain formats only. If the latter, only |
| the first such entry found that applies to the current conversion |
| specifier is used; the values of 'name' and 'long_name' it supplies |
| will be used, if non-NULL and the standard version is higher than |
| the unpredicated one, for any pedantic warning. For example, 'o' |
| for strftime formats (meaning 'O' is an extension over C99). */ |
| int predicate; |
| /* Nonzero if the next character after this flag in the format should |
| be skipped ('=' in strfmon), zero otherwise. */ |
| int skip_next_char; |
| /* True if the flag introduces quoting (as in GCC's %qE). */ |
| bool quoting; |
| /* The name to use for this flag in diagnostic messages. For example, |
| N_("'0' flag"), N_("field width"). */ |
| const char *name; |
| /* Long name for this flag in diagnostic messages; currently only used for |
| "ISO C does not support ...". For example, N_("the 'I' printf flag"). */ |
| const char *long_name; |
| /* The standard version in which it appeared. */ |
| enum format_std_version std; |
| }; |
| |
| |
| /* Structure describing a combination of flags that is bad for some kind |
| of format. */ |
| struct format_flag_pair |
| { |
| /* The first flag character in question (0 for end of array). */ |
| int flag_char1; |
| /* The second flag character. */ |
| int flag_char2; |
| /* Nonzero if the message should say that the first flag is ignored with |
| the second, zero if the combination should simply be objected to. */ |
| int ignored; |
| /* Zero if this entry applies whenever this flag combination occurs, |
| a nonzero character from flags2 if it only applies in some |
| circumstances (e.g. 'i' for printf formats ignoring 0 with precision). */ |
| int predicate; |
| }; |
| |
| |
| /* Structure describing a particular kind of format processed by GCC. */ |
| struct format_kind_info |
| { |
| /* The name of this kind of format, for use in diagnostics. Also |
| the name of the attribute (without preceding and following __). */ |
| const char *name; |
| /* Specifications of the length modifiers accepted; possibly NULL. */ |
| const format_length_info *length_char_specs; |
| /* Details of the conversion specification characters accepted. */ |
| const format_char_info *conversion_specs; |
| /* String listing the flag characters that are accepted. */ |
| const char *flag_chars; |
| /* String listing modifier characters (strftime) accepted. May be NULL. */ |
| const char *modifier_chars; |
| /* Details of the flag characters, including pseudo-flags. */ |
| const format_flag_spec *flag_specs; |
| /* Details of bad combinations of flags. */ |
| const format_flag_pair *bad_flag_pairs; |
| /* Flags applicable to this kind of format. */ |
| int flags; |
| /* Flag character to treat a width as, or 0 if width not used. */ |
| int width_char; |
| /* Flag character to treat a left precision (strfmon) as, |
| or 0 if left precision not used. */ |
| int left_precision_char; |
| /* Flag character to treat a precision (for strfmon, right precision) as, |
| or 0 if precision not used. */ |
| int precision_char; |
| /* If a flag character has the effect of suppressing the conversion of |
| an argument ('*' in scanf), that flag character, otherwise 0. */ |
| int suppression_char; |
| /* Flag character to treat a length modifier as (ignored if length |
| modifiers not used). Need not be placed in flag_chars for conversion |
| specifiers, but is used to check for bad combinations such as length |
| modifier with assignment suppression in scanf. */ |
| int length_code_char; |
| /* Assignment-allocation flag character ('m' in scanf), otherwise 0. */ |
| int alloc_char; |
| /* Pointer to type of argument expected if '*' is used for a width, |
| or NULL if '*' not used for widths. */ |
| tree *width_type; |
| /* Pointer to type of argument expected if '*' is used for a precision, |
| or NULL if '*' not used for precisions. */ |
| tree *precision_type; |
| }; |
| |
| #define T_I &integer_type_node |
| #define T89_I { STD_C89, NULL, T_I } |
| #define T_L &long_integer_type_node |
| #define T89_L { STD_C89, NULL, T_L } |
| #define T_LL &long_long_integer_type_node |
| #define T9L_LL { STD_C9L, NULL, T_LL } |
| #define TEX_LL { STD_EXT, NULL, T_LL } |
| #define T_S &short_integer_type_node |
| #define T89_S { STD_C89, NULL, T_S } |
| #define T_UI &unsigned_type_node |
| #define T89_UI { STD_C89, NULL, T_UI } |
| #define T_UL &long_unsigned_type_node |
| #define T89_UL { STD_C89, NULL, T_UL } |
| #define T_ULL &long_long_unsigned_type_node |
| #define T9L_ULL { STD_C9L, NULL, T_ULL } |
| #define TEX_ULL { STD_EXT, NULL, T_ULL } |
| #define T_US &short_unsigned_type_node |
| #define T89_US { STD_C89, NULL, T_US } |
| #define T_F &float_type_node |
| #define T89_F { STD_C89, NULL, T_F } |
| #define T99_F { STD_C99, NULL, T_F } |
| #define T_D &double_type_node |
| #define T89_D { STD_C89, NULL, T_D } |
| #define T99_D { STD_C99, NULL, T_D } |
| #define T_LD &long_double_type_node |
| #define T89_LD { STD_C89, NULL, T_LD } |
| #define T99_LD { STD_C99, NULL, T_LD } |
| #define T_C &char_type_node |
| #define T89_C { STD_C89, NULL, T_C } |
| #define T_SC &signed_char_type_node |
| #define T99_SC { STD_C99, NULL, T_SC } |
| #define T_UC &unsigned_char_type_node |
| #define T99_UC { STD_C99, NULL, T_UC } |
| #define T_V &void_type_node |
| #define T89_G { STD_C89, NULL, &local_gimple_ptr_node } |
| #define T_CGRAPH_NODE { STD_C89, NULL, &local_cgraph_node_ptr_node } |
| #define T89_T { STD_C89, NULL, &local_tree_type_node } |
| #define T89_V { STD_C89, NULL, T_V } |
| #define T_W &wchar_type_node |
| #define T94_W { STD_C94, "wchar_t", T_W } |
| #define TEX_W { STD_EXT, "wchar_t", T_W } |
| #define T_WI &wint_type_node |
| #define T94_WI { STD_C94, "wint_t", T_WI } |
| #define TEX_WI { STD_EXT, "wint_t", T_WI } |
| #define T_ST &size_type_node |
| #define T99_ST { STD_C99, "size_t", T_ST } |
| #define T_SST &signed_size_type_node |
| #define T99_SST { STD_C99, "signed size_t", T_SST } |
| #define T_PD &ptrdiff_type_node |
| #define T99_PD { STD_C99, "ptrdiff_t", T_PD } |
| #define T_UPD &unsigned_ptrdiff_type_node |
| #define T99_UPD { STD_C99, "unsigned ptrdiff_t", T_UPD } |
| #define T_IM &intmax_type_node |
| #define T99_IM { STD_C99, "intmax_t", T_IM } |
| #define T_UIM &uintmax_type_node |
| #define T99_UIM { STD_C99, "uintmax_t", T_UIM } |
| #define T_D32 &dfloat32_type_node |
| #define TEX_D32 { STD_EXT, "_Decimal32", T_D32 } |
| #define T_D64 &dfloat64_type_node |
| #define TEX_D64 { STD_EXT, "_Decimal64", T_D64 } |
| #define T_D128 &dfloat128_type_node |
| #define TEX_D128 { STD_EXT, "_Decimal128", T_D128 } |
| |
| /* Structure describing how format attributes such as "printf" are |
| interpreted as "gnu_printf" or "ms_printf" on a particular system. |
| TARGET_OVERRIDES_FORMAT_ATTRIBUTES is used to specify target-specific |
| defaults. */ |
| struct target_ovr_attr |
| { |
| /* The name of the to be copied format attribute. */ |
| const char *named_attr_src; |
| /* The name of the to be overridden format attribute. */ |
| const char *named_attr_dst; |
| }; |
| |
| #endif /* GCC_C_FORMAT_H */ |