* c-common.c: Move format checking code to ...
* c-format.c: ... here. New file. Reorder some functions and
declarations.
(decl_handle_format_attribute, decl_handle_format_arg_attribute):
New functions.
* c-common.h (decl_handle_format_attribute,
decl_handle_format_arg_attribute): Declare.
* Makefile.in (C_AND_OBJC_OBJS): Add c-format.o.
(c-common.o): Adjust dependencies.
(c-format.o): New list of dependencies.
cp:
* Make-lang.in (CXX_C_OBJS): Add c-format.o.
From-SVN: r38998
+2001-01-13 Joseph S. Myers <jsm28@cam.ac.uk>
+
+ * c-common.c: Move format checking code to ...
+ * c-format.c: ... here. New file. Reorder some functions and
+ declarations.
+ (decl_handle_format_attribute, decl_handle_format_arg_attribute):
+ New functions.
+ * c-common.h (decl_handle_format_attribute,
+ decl_handle_format_arg_attribute): Declare.
+ * Makefile.in (C_AND_OBJC_OBJS): Add c-format.o.
+ (c-common.o): Adjust dependencies.
+ (c-format.o): New list of dependencies.
+
2001-01-13 Jakub Jelinek <jakub@redhat.com>
* unroll.c (loop_iterations): If we cannot prove iteration variable
# Language-specific object files for C and Objective C.
C_AND_OBJC_OBJS = c-errors.o c-lex.o c-pragma.o c-decl.o c-typeck.o \
- c-convert.o c-aux-info.o c-common.o c-semantics.o c-dump.o libcpp.a \
- $(C_TARGET_OBJS)
+ c-convert.o c-aux-info.o c-common.o c-format.o c-semantics.o c-dump.o \
+ libcpp.a $(C_TARGET_OBJS)
# Language-specific object files for C.
C_OBJS = c-parse.o c-lang.o $(C_AND_OBJC_OBJS)
c-common.o : c-common.c $(CONFIG_H) system.h $(TREE_H) $(OBSTACK_H) \
$(C_COMMON_H) flags.h toplev.h output.h c-pragma.h $(RTL_H) $(GGC_H) \
- $(EXPR_H) diagnostic.h
+ $(EXPR_H)
+
+c-format.o : c-format.c $(CONFIG_H) system.h $(TREE_H) \
+ $(C_COMMON_H) flags.h toplev.h intl.h diagnostic.h
c-semantics.o : c-semantics.c $(CONFIG_H) system.h $(TREE_H) $(C_TREE_H) \
c-lex.h flags.h toplev.h output.h c-pragma.h $(RTL_H) $(GGC_H) \
#include "c-common.h"
#include "defaults.h"
#include "tm_p.h"
-#include "intl.h"
-#include "diagnostic.h"
#include "obstack.h"
#include "cpplib.h"
cpp_reader *parse_in; /* Declared in c-lex.h. */
const char *flag_dump_translation_unit;
-/* Warn about *printf or *scanf format/argument anomalies. */
-
-int warn_format;
-
-/* Warn about Y2K problems with strftime formats. */
-
-int warn_format_y2k;
-
-/* Warn about excess arguments to formats. */
-
-int warn_format_extra_args;
-
-/* Warn about non-literal format arguments. */
-
-int warn_format_nonliteral;
-
-/* Warn about possible security problems with calls to format functions. */
-
-int warn_format_security;
-
/* Nonzero means warn about possible violations of sequence point rules. */
int warn_sequence_point;
A_UNUSED, A_FORMAT, A_FORMAT_ARG, A_WEAK, A_ALIAS, A_MALLOC,
A_NO_LIMIT_STACK, A_PURE};
-/* This must be in the same order as format_types, with format_type_error
- last. */
-enum format_type { printf_format_type, scanf_format_type,
- strftime_format_type, strfmon_format_type,
- format_type_error };
-
static void add_attribute PARAMS ((enum attrs, const char *,
int, int, int));
static void init_attributes PARAMS ((void));
-static enum format_type decode_format_type PARAMS ((const char *));
-static void record_function_format PARAMS ((tree, tree, enum format_type,
- int, int));
-static void record_international_format PARAMS ((tree, tree, int));
static int default_valid_lang_attribute PARAMS ((tree, tree, tree, tree));
/* Keep a stack of if statements. We record the number of compound
break;
case A_FORMAT:
- {
- tree format_type_id = TREE_VALUE (args);
- tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
- tree first_arg_num_expr
- = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
- unsigned HOST_WIDE_INT format_num, first_arg_num;
- enum format_type format_type;
- tree argument;
- unsigned int arg_num;
-
- if (TREE_CODE (decl) != FUNCTION_DECL)
- {
- error_with_decl (decl,
- "argument format specified for non-function `%s'");
- continue;
- }
-
- if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
- {
- error ("unrecognized format specifier");
- continue;
- }
- else
- {
- const char *p = IDENTIFIER_POINTER (format_type_id);
-
- format_type = decode_format_type (p);
-
- if (format_type == format_type_error)
- {
- warning ("`%s' is an unrecognized format function type", p);
- continue;
- }
- }
-
- /* Strip any conversions from the string index and first arg number
- and verify they are constants. */
- while (TREE_CODE (format_num_expr) == NOP_EXPR
- || TREE_CODE (format_num_expr) == CONVERT_EXPR
- || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
- format_num_expr = TREE_OPERAND (format_num_expr, 0);
-
- while (TREE_CODE (first_arg_num_expr) == NOP_EXPR
- || TREE_CODE (first_arg_num_expr) == CONVERT_EXPR
- || TREE_CODE (first_arg_num_expr) == NON_LVALUE_EXPR)
- first_arg_num_expr = TREE_OPERAND (first_arg_num_expr, 0);
-
- if (TREE_CODE (format_num_expr) != INTEGER_CST
- || TREE_INT_CST_HIGH (format_num_expr) != 0
- || TREE_CODE (first_arg_num_expr) != INTEGER_CST
- || TREE_INT_CST_HIGH (first_arg_num_expr) != 0)
- {
- error ("format string has invalid operand number");
- continue;
- }
-
- format_num = TREE_INT_CST_LOW (format_num_expr);
- first_arg_num = TREE_INT_CST_LOW (first_arg_num_expr);
- if (first_arg_num != 0 && first_arg_num <= format_num)
- {
- error ("format string arg follows the args to be formatted");
- continue;
- }
-
- /* If a parameter list is specified, verify that the format_num
- argument is actually a string, in case the format attribute
- is in error. */
- argument = TYPE_ARG_TYPES (type);
- if (argument)
- {
- for (arg_num = 1; argument != 0 && arg_num != format_num;
- ++arg_num, argument = TREE_CHAIN (argument))
- ;
-
- if (! argument
- || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
- || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
- != char_type_node))
- {
- error ("format string arg not a string type");
- continue;
- }
-
- else if (first_arg_num != 0)
- {
- /* Verify that first_arg_num points to the last arg,
- the ... */
- while (argument)
- arg_num++, argument = TREE_CHAIN (argument);
-
- if (arg_num != first_arg_num)
- {
- error ("args to be formatted is not '...'");
- continue;
- }
- }
- }
-
- if (format_type == strftime_format_type && first_arg_num != 0)
- {
- error ("strftime formats cannot format arguments");
- continue;
- }
-
- record_function_format (DECL_NAME (decl),
- DECL_ASSEMBLER_NAME (decl),
- format_type, format_num, first_arg_num);
- break;
- }
+ decl_handle_format_attribute (decl, args);
+ break;
case A_FORMAT_ARG:
- {
- tree format_num_expr = TREE_VALUE (args);
- unsigned HOST_WIDE_INT format_num;
- unsigned int arg_num;
- tree argument;
-
- if (TREE_CODE (decl) != FUNCTION_DECL)
- {
- error_with_decl (decl,
- "argument format specified for non-function `%s'");
- continue;
- }
-
- /* Strip any conversions from the first arg number and verify it
- is a constant. */
- while (TREE_CODE (format_num_expr) == NOP_EXPR
- || TREE_CODE (format_num_expr) == CONVERT_EXPR
- || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
- format_num_expr = TREE_OPERAND (format_num_expr, 0);
-
- if (TREE_CODE (format_num_expr) != INTEGER_CST
- || TREE_INT_CST_HIGH (format_num_expr) != 0)
- {
- error ("format string has invalid operand number");
- continue;
- }
-
- format_num = TREE_INT_CST_LOW (format_num_expr);
-
- /* If a parameter list is specified, verify that the format_num
- argument is actually a string, in case the format attribute
- is in error. */
- argument = TYPE_ARG_TYPES (type);
- if (argument)
- {
- for (arg_num = 1; argument != 0 && arg_num != format_num;
- ++arg_num, argument = TREE_CHAIN (argument))
- ;
-
- if (! argument
- || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
- || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
- != char_type_node))
- {
- error ("format string arg not a string type");
- continue;
- }
- }
-
- if (TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) != POINTER_TYPE
- || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (TREE_TYPE (decl))))
- != char_type_node))
- {
- error ("function does not return string type");
- continue;
- }
-
- record_international_format (DECL_NAME (decl),
- DECL_ASSEMBLER_NAME (decl),
- format_num);
- break;
- }
+ decl_handle_format_arg_attribute (decl, args);
+ break;
case A_WEAK:
declare_weak (decl);
return specs;
}
\f
-/* Check a printf/fprintf/sprintf/scanf/fscanf/sscanf format against
- a parameter list. */
-
-/* The meaningfully distinct length modifiers for format checking recognised
- 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_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
-};
-
-/* The C standard version C++ is treated as equivalent to
- or inheriting from, for the purpose of format features supported. */
-#define CPLUSPLUS_STD_VER STD_C89
-/* The C standard version we are checking formats against when pedantic. */
-#define C_STD_VER (c_language == clk_cplusplus \
- ? CPLUSPLUS_STD_VER \
- : (flag_isoc99 \
- ? STD_C99 \
- : (flag_isoc94 ? STD_C94 : STD_C89)))
-/* The name to give to the standard version we are warning about when
- pedantic. FEATURE_VER is the version in which the feature warned out
- appeared, which is higher than C_STD_VER. */
-#define C_STD_NAME(FEATURE_VER) (c_language == clk_cplusplus \
- ? "ISO C++" \
- : ((FEATURE_VER) == STD_EXT \
- ? "ISO C" \
- : "ISO C89"))
-/* Adjust a C standard version, which may be STD_C9L, to account for
- -Wno-long-long. Returns other standard versions unchanged. */
-#define ADJ_STD(VER) ((int)((VER) == STD_C9L \
- ? (warn_long_long ? STD_C99 : STD_C89) \
- : (VER)))
-
-/* 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
- /* 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". */
-typedef struct
-{
- /* Name of the single-character length modifier. */
- 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;
-} format_length_info;
-
-
-/* Structure desribing the combination of a conversion specifier
- (or a set of specifiers which act identically) and a length modifier. */
-typedef struct
-{
- /* 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;
-} format_type_detail;
-
-
-/* Macros to fill out tables of these. */
-#define BADLEN { 0, NULL, NULL }
-#define NOLENGTHS { BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }
-
-
-/* Structure desribing a format conversion specifier (or a set of specifiers
- which act identically), and the length modifiers used with it. */
-typedef struct
-{
- 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. */
- const char *flags2;
-} format_char_info;
-
-
-/* Structure describing a flag accepted by some kind of format. */
-typedef struct
-{
- /* 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
- non-zero 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;
- /* 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;
-} format_flag_spec;
-
-
-/* Structure describing a combination of flags that is bad for some kind
- of format. */
-typedef struct
-{
- /* The first flag character in question (0 for end of array). */
- int flag_char1;
- /* The second flag character. */
- int flag_char2;
- /* Non-zero 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 non-zero character from flags2 if it only applies in some
- circumstances (e.g. 'i' for printf formats ignoring 0 with precision). */
- int predicate;
-} format_flag_pair;
-
-
-/* Structure describing a particular kind of format processed by GCC. */
-typedef struct
-{
- /* 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;
- /* 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;
-} format_kind_info;
-
-
-/* Structure describing details of a type expected in format checking,
- and the type to check against it. */
-typedef struct format_wanted_type
-{
- /* The type wanted. */
- tree wanted_type;
- /* The name of this type to use in diagnostics. */
- const char *wanted_type_name;
- /* The level of indirection through pointers at which this type occurs. */
- int pointer_count;
- /* Whether, when pointer_count is 1, to allow any character type when
- pedantic, rather than just the character or void type specified. */
- int char_lenient_flag;
- /* Whether the argument, dereferenced once, is written into and so the
- argument must not be a pointer to a const-qualified type. */
- int writing_in_flag;
- /* Whether the argument, dereferenced once, is read from and so
- must not be a NULL pointer. */
- int reading_from_flag;
- /* If warnings should be of the form "field precision is not type int",
- the name to use (in this case "field precision"), otherwise NULL,
- for "%s format, %s arg" type messages. If (in an extension), this
- is a pointer type, wanted_type_name should be set to include the
- terminating '*' characters of the type name to give a correct
- message. */
- const char *name;
- /* The actual parameter to check against the wanted type. */
- tree param;
- /* The argument number of that parameter. */
- int arg_num;
- /* The next type to check for this format conversion, or NULL if none. */
- struct format_wanted_type *next;
-} format_wanted_type;
-
-
-static const format_length_info printf_length_specs[] =
-{
- { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
- { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
- { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
- { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
- { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
- { "Z", FMT_LEN_z, STD_EXT, NULL, 0, 0 },
- { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
- { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
- { NULL, 0, 0, NULL, 0, 0 }
-};
-
-
-/* This differs from printf_length_specs only in that "Z" is not accepted. */
-static const format_length_info scanf_length_specs[] =
-{
- { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
- { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
- { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
- { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
- { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
- { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
- { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
- { NULL, 0, 0, NULL, 0, 0 }
-};
-
-
-/* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings
- make no sense for a format type not part of any C standard version. */
-static const format_length_info strfmon_length_specs[] =
-{
- /* A GNU extension. */
- { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
- { NULL, 0, 0, NULL, 0, 0 }
-};
-
-static const format_flag_spec printf_flag_specs[] =
-{
- { ' ', 0, 0, N_("` ' flag"), N_("the ` ' printf flag"), STD_C89 },
- { '+', 0, 0, N_("`+' flag"), N_("the `+' printf flag"), STD_C89 },
- { '#', 0, 0, N_("`#' flag"), N_("the `#' printf flag"), STD_C89 },
- { '0', 0, 0, N_("`0' flag"), N_("the `0' printf flag"), STD_C89 },
- { '-', 0, 0, N_("`-' flag"), N_("the `-' printf flag"), STD_C89 },
- { '\'', 0, 0, N_("`'' flag"), N_("the `'' printf flag"), STD_EXT },
- { 'I', 0, 0, N_("`I' flag"), N_("the `I' printf flag"), STD_EXT },
- { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
- { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
- { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
- { 0, 0, 0, NULL, NULL, 0 }
-};
-
-
-static const format_flag_pair printf_flag_pairs[] =
-{
- { ' ', '+', 1, 0 },
- { '0', '-', 1, 0 },
- { '0', 'p', 1, 'i' },
- { 0, 0, 0, 0 }
-};
-
-
-static const format_flag_spec scanf_flag_specs[] =
-{
- { '*', 0, 0, N_("assignment suppression"), N_("assignment suppression"), STD_C89 },
- { 'a', 0, 0, N_("`a' flag"), N_("the `a' scanf flag"), STD_EXT },
- { 'w', 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89 },
- { 'L', 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 },
- { '\'', 0, 0, N_("`'' flag"), N_("the `'' scanf flag"), STD_EXT },
- { 'I', 0, 0, N_("`I' flag"), N_("the `I' scanf flag"), STD_EXT },
- { 0, 0, 0, NULL, NULL, 0 }
-};
-
-
-static const format_flag_pair scanf_flag_pairs[] =
-{
- { '*', 'L', 0, 0 },
- { 0, 0, 0, 0 }
-};
-
-
-static const format_flag_spec strftime_flag_specs[] =
-{
- { '_', 0, 0, N_("`_' flag"), N_("the `_' strftime flag"), STD_EXT },
- { '-', 0, 0, N_("`-' flag"), N_("the `-' strftime flag"), STD_EXT },
- { '0', 0, 0, N_("`0' flag"), N_("the `0' strftime flag"), STD_EXT },
- { '^', 0, 0, N_("`^' flag"), N_("the `^' strftime flag"), STD_EXT },
- { '#', 0, 0, N_("`#' flag"), N_("the `#' strftime flag"), STD_EXT },
- { 'w', 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT },
- { 'E', 0, 0, N_("`E' modifier"), N_("the `E' strftime modifier"), STD_C99 },
- { 'O', 0, 0, N_("`O' modifier"), N_("the `O' strftime modifier"), STD_C99 },
- { 'O', 'o', 0, NULL, N_("the `O' modifier"), STD_EXT },
- { 0, 0, 0, NULL, NULL, 0 }
-};
-
-
-static const format_flag_pair strftime_flag_pairs[] =
-{
- { 'E', 'O', 0, 0 },
- { '_', '-', 0, 0 },
- { '_', '0', 0, 0 },
- { '-', '0', 0, 0 },
- { '^', '#', 0, 0 },
- { 0, 0, 0, 0 }
-};
-
-
-static const format_flag_spec strfmon_flag_specs[] =
-{
- { '=', 0, 1, N_("fill character"), N_("fill character in strfmon format"), STD_C89 },
- { '^', 0, 0, N_("`^' flag"), N_("the `^' strfmon flag"), STD_C89 },
- { '+', 0, 0, N_("`+' flag"), N_("the `+' strfmon flag"), STD_C89 },
- { '(', 0, 0, N_("`(' flag"), N_("the `(' strfmon flag"), STD_C89 },
- { '!', 0, 0, N_("`!' flag"), N_("the `!' strfmon flag"), STD_C89 },
- { '-', 0, 0, N_("`-' flag"), N_("the `-' strfmon flag"), STD_C89 },
- { 'w', 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89 },
- { '#', 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89 },
- { 'p', 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89 },
- { 'L', 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89 },
- { 0, 0, 0, NULL, NULL, 0 }
-};
-
-static const format_flag_pair strfmon_flag_pairs[] =
-{
- { '+', '(', 0, 0 },
- { 0, 0, 0, 0 }
-};
-
-
-#define T_I &integer_type_node
-#define T89_I { STD_C89, NULL, T_I }
-#define T99_I { STD_C99, 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 T99_UI { STD_C99, 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_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 &c_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 }
-
-static const format_char_info print_char_table[] =
-{
- /* C89 conversion specifiers. */
- { "di", 0, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, TEX_LL, T99_SST, T99_PD, T99_IM }, "-wp0 +'I", "i" },
- { "oxX", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "-wp0#", "i" },
- { "u", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "-wp0'I", "i" },
- { "fgG", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#'", "" },
- { "eE", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "" },
- { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "" },
- { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR" },
- { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c" },
- { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, BADLEN, T99_SST, T99_PD, T99_IM }, "", "W" },
- /* C99 conversion specifiers. */
- { "F", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#'", "" },
- { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "" },
- /* X/Open conversion specifiers. */
- { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "" },
- { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R" },
- /* GNU conversion specifiers. */
- { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "" },
- { NULL, 0, 0, NOLENGTHS, NULL, NULL }
-};
-
-static const format_char_info scan_char_table[] =
-{
- /* C89 conversion specifiers. */
- { "di", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, TEX_LL, T99_SST, T99_PD, T99_IM }, "*w'I", "W" },
- { "u", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "*w'I", "W" },
- { "oxX", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "*w", "W" },
- { "efgEG", 1, STD_C89, { T89_F, BADLEN, BADLEN, T89_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "*w'", "W" },
- { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "cW" },
- { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW" },
- { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW[" },
- { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W" },
- { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, BADLEN, T99_SST, T99_PD, T99_IM }, "", "W" },
- /* C99 conversion specifiers. */
- { "FaA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "*w'", "W" },
- /* X/Open conversion specifiers. */
- { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W" },
- { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "W" },
- { NULL, 0, 0, NOLENGTHS, NULL, NULL }
-};
-
-static const format_char_info time_char_table[] =
-{
- /* C89 conversion specifiers. */
- { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "" },
- { "cx", 0, STD_C89, NOLENGTHS, "E", "3" },
- { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "" },
- { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o" },
- { "p", 0, STD_C89, NOLENGTHS, "#", "" },
- { "X", 0, STD_C89, NOLENGTHS, "E", "" },
- { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4" },
- { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o" },
- { "%", 0, STD_C89, NOLENGTHS, "", "" },
- /* C99 conversion specifiers. */
- { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o" },
- { "D", 0, STD_C99, NOLENGTHS, "", "2" },
- { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "" },
- { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "" },
- { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o" },
- { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o" },
- { "h", 0, STD_C99, NOLENGTHS, "^#", "" },
- { "z", 0, STD_C99, NOLENGTHS, "O", "o" },
- /* GNU conversion specifiers. */
- { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "" },
- { "P", 0, STD_EXT, NOLENGTHS, "", "" },
- { NULL, 0, 0, NOLENGTHS, NULL, NULL }
-};
-
-static const format_char_info monetary_char_table[] =
-{
- { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "" },
- { NULL, 0, 0, NOLENGTHS, NULL, NULL }
-};
-
-
-/* This must be in the same order as enum format_type. */
-static const format_kind_info format_types[] =
-{
- { "printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
- printf_flag_specs, printf_flag_pairs,
- FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK,
- 'w', 0, 'p', 0, 'L',
- &integer_type_node, &integer_type_node
- },
- { "scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
- scanf_flag_specs, scanf_flag_pairs,
- FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD,
- 'w', 0, 0, '*', 'L',
- NULL, NULL
- },
- { "strftime", NULL, time_char_table, "_-0^#", "EO",
- strftime_flag_specs, strftime_flag_pairs,
- FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0,
- NULL, NULL
- },
- { "strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL,
- strfmon_flag_specs, strfmon_flag_pairs,
- FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L',
- NULL, NULL
- }
-};
-
-
-typedef struct function_format_info
-{
- struct function_format_info *next; /* next structure on the list */
- tree name; /* identifier such as "printf" */
- tree assembler_name; /* optional mangled identifier (for C++) */
- enum format_type format_type; /* type of format (printf, scanf, etc.) */
- int format_num; /* number of format argument */
- int first_arg_num; /* number of first arg (zero for varargs) */
-} function_format_info;
-
-static function_format_info *function_format_list = NULL;
-
-typedef struct international_format_info
-{
- struct international_format_info *next; /* next structure on the list */
- tree name; /* identifier such as "gettext" */
- tree assembler_name; /* optional mangled identifier (for C++) */
- int format_num; /* number of format argument */
-} international_format_info;
-
-static international_format_info *international_format_list = NULL;
-
-/* Structure detailing the results of checking a format function call
- where the format expression may be a conditional expression with
- many leaves resulting from nested conditional expressions. */
-typedef struct
-{
- /* Number of leaves of the format argument that could not be checked
- as they were not string literals. */
- int number_non_literal;
- /* Number of leaves of the format argument that were null pointers or
- string literals, but had extra format arguments. */
- int number_extra_args;
- /* Number of leaves of the format argument that were null pointers or
- string literals, but had extra format arguments and used $ operand
- numbers. */
- int number_dollar_extra_args;
- /* Number of leaves of the format argument that were wide string
- literals. */
- int number_wide;
- /* Number of leaves of the format argument that were empty strings. */
- int number_empty;
- /* Number of leaves of the format argument that were unterminated
- strings. */
- int number_unterminated;
- /* Number of leaves of the format argument that were not counted above. */
- int number_other;
-} format_check_results;
-
-static void check_format_info PARAMS ((int *, function_format_info *, tree));
-static void check_format_info_recurse PARAMS ((int *, format_check_results *,
- function_format_info *, tree,
- tree, int));
-static void check_format_info_main PARAMS ((int *, format_check_results *,
- function_format_info *,
- const char *, int, tree, int));
-static void status_warning PARAMS ((int *, const char *, ...))
- ATTRIBUTE_PRINTF_2;
-
-static void init_dollar_format_checking PARAMS ((int, tree));
-static int maybe_read_dollar_number PARAMS ((int *, const char **, int,
- tree, tree *,
- const format_kind_info *));
-static void finish_dollar_format_checking PARAMS ((int *, format_check_results *));
-
-static const format_flag_spec *get_flag_spec PARAMS ((const format_flag_spec *,
- int, const char *));
-
-static void check_format_types PARAMS ((int *, format_wanted_type *));
static int is_valid_printf_arglist PARAMS ((tree));
static rtx c_expand_builtin PARAMS ((tree, rtx, enum machine_mode, enum expand_modifier));
static rtx c_expand_builtin_printf PARAMS ((tree, rtx, enum machine_mode,
enum expand_modifier, int));
static rtx c_expand_builtin_fprintf PARAMS ((tree, rtx, enum machine_mode,
enum expand_modifier, int));
-
-/* Initialize the table of functions to perform format checking on.
- The ISO C functions are always checked (whether <stdio.h> is
- included or not), since it is common to call printf without
- including <stdio.h>. There shouldn't be a problem with this,
- since ISO C reserves these function names whether you include the
- header file or not. In any case, the checking is harmless. With
- -ffreestanding, these default attributes are disabled, and must be
- specified manually if desired.
-
- Also initialize the name of function that modify the format string for
- internationalization purposes. */
-
-void
-init_function_format_info ()
-{
- if (flag_hosted)
- {
- /* Functions from ISO/IEC 9899:1990. */
- record_function_format (get_identifier ("printf"), NULL_TREE,
- printf_format_type, 1, 2);
- record_function_format (get_identifier ("__builtin_printf"), NULL_TREE,
- printf_format_type, 1, 2);
- record_function_format (get_identifier ("fprintf"), NULL_TREE,
- printf_format_type, 2, 3);
- record_function_format (get_identifier ("__builtin_fprintf"), NULL_TREE,
- printf_format_type, 2, 3);
- record_function_format (get_identifier ("sprintf"), NULL_TREE,
- printf_format_type, 2, 3);
- record_function_format (get_identifier ("scanf"), NULL_TREE,
- scanf_format_type, 1, 2);
- record_function_format (get_identifier ("fscanf"), NULL_TREE,
- scanf_format_type, 2, 3);
- record_function_format (get_identifier ("sscanf"), NULL_TREE,
- scanf_format_type, 2, 3);
- record_function_format (get_identifier ("vprintf"), NULL_TREE,
- printf_format_type, 1, 0);
- record_function_format (get_identifier ("vfprintf"), NULL_TREE,
- printf_format_type, 2, 0);
- record_function_format (get_identifier ("vsprintf"), NULL_TREE,
- printf_format_type, 2, 0);
- record_function_format (get_identifier ("strftime"), NULL_TREE,
- strftime_format_type, 3, 0);
- }
-
- if (flag_hosted && flag_isoc99)
- {
- /* ISO C99 adds the snprintf and vscanf family functions. */
- record_function_format (get_identifier ("snprintf"), NULL_TREE,
- printf_format_type, 3, 4);
- record_function_format (get_identifier ("vsnprintf"), NULL_TREE,
- printf_format_type, 3, 0);
- record_function_format (get_identifier ("vscanf"), NULL_TREE,
- scanf_format_type, 1, 0);
- record_function_format (get_identifier ("vfscanf"), NULL_TREE,
- scanf_format_type, 2, 0);
- record_function_format (get_identifier ("vsscanf"), NULL_TREE,
- scanf_format_type, 2, 0);
- }
-
- if (flag_hosted && flag_noniso_default_format_attributes)
- {
- /* Uniforum/GNU gettext functions, not in ISO C. */
- record_international_format (get_identifier ("gettext"), NULL_TREE, 1);
- record_international_format (get_identifier ("dgettext"), NULL_TREE, 2);
- record_international_format (get_identifier ("dcgettext"), NULL_TREE, 2);
- /* X/Open strfmon function. */
- record_function_format (get_identifier ("strfmon"), NULL_TREE,
- strfmon_format_type, 3, 4);
- }
-}
-
-/* Decode a format type from a string, returning the type, or
- format_type_error if not valid, in which case the caller should print an
- error message. */
-static enum format_type
-decode_format_type (s)
- const char *s;
-{
- int i;
- int slen;
- slen = strlen (s);
- for (i = 0; i < (int) format_type_error; i++)
- {
- int alen;
- if (!strcmp (s, format_types[i].name))
- break;
- alen = strlen (format_types[i].name);
- if (slen == alen + 4 && s[0] == '_' && s[1] == '_'
- && s[slen - 1] == '_' && s[slen - 2] == '_'
- && !strncmp (s + 2, format_types[i].name, alen))
- break;
- }
- return ((enum format_type) i);
-}
-
-/* Record information for argument format checking. FUNCTION_IDENT is
- the identifier node for the name of the function to check (its decl
- need not exist yet).
- FORMAT_TYPE specifies the type of format checking. FORMAT_NUM is the number
- of the argument which is the format control string (starting from 1).
- FIRST_ARG_NUM is the number of the first actual argument to check
- against the format string, or zero if no checking is not be done
- (e.g. for varargs such as vfprintf). */
-
-static void
-record_function_format (name, assembler_name, format_type,
- format_num, first_arg_num)
- tree name;
- tree assembler_name;
- enum format_type format_type;
- int format_num;
- int first_arg_num;
-{
- function_format_info *info;
-
- /* Re-use existing structure if it's there. */
-
- for (info = function_format_list; info; info = info->next)
- {
- if (info->name == name && info->assembler_name == assembler_name)
- break;
- }
- if (! info)
- {
- info = (function_format_info *) xmalloc (sizeof (function_format_info));
- info->next = function_format_list;
- function_format_list = info;
-
- info->name = name;
- info->assembler_name = assembler_name;
- }
-
- info->format_type = format_type;
- info->format_num = format_num;
- info->first_arg_num = first_arg_num;
-}
-
-/* Record information for the names of function that modify the format
- argument to format functions. FUNCTION_IDENT is the identifier node for
- the name of the function (its decl need not exist yet) and FORMAT_NUM is
- the number of the argument which is the format control string (starting
- from 1). */
-
-static void
-record_international_format (name, assembler_name, format_num)
- tree name;
- tree assembler_name;
- int format_num;
-{
- international_format_info *info;
-
- /* Re-use existing structure if it's there. */
-
- for (info = international_format_list; info; info = info->next)
- {
- if (info->name == name && info->assembler_name == assembler_name)
- break;
- }
-
- if (! info)
- {
- info
- = (international_format_info *)
- xmalloc (sizeof (international_format_info));
- info->next = international_format_list;
- international_format_list = info;
-
- info->name = name;
- info->assembler_name = assembler_name;
- }
-
- info->format_num = format_num;
-}
-\f
-/* Check the argument list of a call to printf, scanf, etc.
- NAME is the function identifier.
- ASSEMBLER_NAME is the function's assembler identifier.
- (Either NAME or ASSEMBLER_NAME, but not both, may be NULL_TREE.)
- PARAMS is the list of argument values. Also, if -Wmissing-format-attribute,
- warn for calls to vprintf or vscanf in functions with no such format
- attribute themselves. */
-
-void
-check_function_format (status, name, assembler_name, params)
- int *status;
- tree name;
- tree assembler_name;
- tree params;
-{
- function_format_info *info;
-
- /* See if this function is a format function. */
- for (info = function_format_list; info; info = info->next)
- {
- if (info->assembler_name
- ? (info->assembler_name == assembler_name)
- : (info->name == name))
- {
- /* Yup; check it. */
- check_format_info (status, info, params);
- if (warn_missing_format_attribute && info->first_arg_num == 0
- && (format_types[info->format_type].flags & FMT_FLAG_ARG_CONVERT))
- {
- function_format_info *info2;
- for (info2 = function_format_list; info2; info2 = info2->next)
- if ((info2->assembler_name
- ? (info2->assembler_name == DECL_ASSEMBLER_NAME (current_function_decl))
- : (info2->name == DECL_NAME (current_function_decl)))
- && info2->format_type == info->format_type)
- break;
- if (info2 == NULL)
- {
- /* Check if the current function has a parameter to which
- the format attribute could be attached; if not, it
- can't be a candidate for a format attribute, despite
- the vprintf-like or vscanf-like call. */
- tree args;
- for (args = DECL_ARGUMENTS (current_function_decl);
- args != 0;
- args = TREE_CHAIN (args))
- {
- if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
- && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
- == char_type_node))
- break;
- }
- if (args != 0)
- warning ("function might be possible candidate for `%s' format attribute",
- format_types[info->format_type].name);
- }
- }
- break;
- }
- }
-}
-
-/* This function replaces `warning' inside the printf format checking
- functions. If the `status' parameter is non-NULL, then it is
- dereferenced and set to 1 whenever a warning is caught. Otherwise
- it warns as usual by replicating the innards of the warning
- function from diagnostic.c. */
-static void
-status_warning VPARAMS ((int *status, const char *msgid, ...))
-{
-#ifndef ANSI_PROTOTYPES
- int *status;
- const char *msgid;
-#endif
- va_list ap;
- diagnostic_context dc;
-
- VA_START (ap, msgid);
-
-#ifndef ANSI_PROTOTYPES
- status = va_arg (ap, int *);
- msgid = va_arg (ap, const char *);
-#endif
-
- if (status)
- *status = 1;
- else
- {
- /* This duplicates the warning function behavior. */
- set_diagnostic_context
- (&dc, msgid, &ap, input_filename, lineno, /* warn = */ 1);
- report_diagnostic (&dc);
- }
-
- va_end (ap);
-}
-
-/* Variables used by the checking of $ operand number formats. */
-static char *dollar_arguments_used = NULL;
-static int dollar_arguments_alloc = 0;
-static int dollar_arguments_count;
-static int dollar_first_arg_num;
-static int dollar_max_arg_used;
-static int dollar_format_warned;
-
-/* Initialize the checking for a format string that may contain $
- parameter number specifications; we will need to keep track of whether
- each parameter has been used. FIRST_ARG_NUM is the number of the first
- argument that is a parameter to the format, or 0 for a vprintf-style
- function; PARAMS is the list of arguments starting at this argument. */
-
-static void
-init_dollar_format_checking (first_arg_num, params)
- int first_arg_num;
- tree params;
-{
- dollar_first_arg_num = first_arg_num;
- dollar_arguments_count = 0;
- dollar_max_arg_used = 0;
- dollar_format_warned = 0;
- if (first_arg_num > 0)
- {
- while (params)
- {
- dollar_arguments_count++;
- params = TREE_CHAIN (params);
- }
- }
- if (dollar_arguments_alloc < dollar_arguments_count)
- {
- if (dollar_arguments_used)
- free (dollar_arguments_used);
- dollar_arguments_alloc = dollar_arguments_count;
- dollar_arguments_used = xmalloc (dollar_arguments_alloc);
- }
- if (dollar_arguments_alloc)
- memset (dollar_arguments_used, 0, dollar_arguments_alloc);
-}
-
-
-/* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
- is set, it is an error if one is not found; otherwise, it is OK. If
- such a number is found, check whether it is within range and mark that
- numbered operand as being used for later checking. Returns the operand
- number if found and within range, zero if no such number was found and
- this is OK, or -1 on error. PARAMS points to the first operand of the
- format; PARAM_PTR is made to point to the parameter referred to. If
- a $ format is found, *FORMAT is updated to point just after it. */
-
-static int
-maybe_read_dollar_number (status, format, dollar_needed, params, param_ptr,
- fki)
- int *status;
- const char **format;
- int dollar_needed;
- tree params;
- tree *param_ptr;
- const format_kind_info *fki;
-{
- int argnum;
- int overflow_flag;
- const char *fcp = *format;
- if (*fcp < '0' || *fcp > '9')
- {
- if (dollar_needed)
- {
- status_warning (status, "missing $ operand number in format");
- return -1;
- }
- else
- return 0;
- }
- argnum = 0;
- overflow_flag = 0;
- while (*fcp >= '0' && *fcp <= '9')
- {
- int nargnum;
- nargnum = 10 * argnum + (*fcp - '0');
- if (nargnum < 0 || nargnum / 10 != argnum)
- overflow_flag = 1;
- argnum = nargnum;
- fcp++;
- }
- if (*fcp != '$')
- {
- if (dollar_needed)
- {
- status_warning (status, "missing $ operand number in format");
- return -1;
- }
- else
- return 0;
- }
- *format = fcp + 1;
- if (pedantic && !dollar_format_warned)
- {
- status_warning (status,
- "%s does not support %%n$ operand number formats",
- C_STD_NAME (STD_EXT));
- dollar_format_warned = 1;
- }
- if (overflow_flag || argnum == 0
- || (dollar_first_arg_num && argnum > dollar_arguments_count))
- {
- status_warning (status, "operand number out of range in format");
- return -1;
- }
- if (argnum > dollar_max_arg_used)
- dollar_max_arg_used = argnum;
- /* For vprintf-style functions we may need to allocate more memory to
- track which arguments are used. */
- while (dollar_arguments_alloc < dollar_max_arg_used)
- {
- int nalloc;
- nalloc = 2 * dollar_arguments_alloc + 16;
- dollar_arguments_used = xrealloc (dollar_arguments_used, nalloc);
- memset (dollar_arguments_used + dollar_arguments_alloc, 0,
- nalloc - dollar_arguments_alloc);
- dollar_arguments_alloc = nalloc;
- }
- if (!(fki->flags & FMT_FLAG_DOLLAR_MULTIPLE)
- && dollar_arguments_used[argnum - 1] == 1)
- {
- dollar_arguments_used[argnum - 1] = 2;
- status_warning (status,
- "format argument %d used more than once in %s format",
- argnum, fki->name);
- }
- else
- dollar_arguments_used[argnum - 1] = 1;
- if (dollar_first_arg_num)
- {
- int i;
- *param_ptr = params;
- for (i = 1; i < argnum && *param_ptr != 0; i++)
- *param_ptr = TREE_CHAIN (*param_ptr);
-
- if (*param_ptr == 0)
- {
- /* This case shouldn't be caught here. */
- abort ();
- }
- }
- else
- *param_ptr = 0;
- return argnum;
-}
-
-
-/* Finish the checking for a format string that used $ operand number formats
- instead of non-$ formats. We check for unused operands before used ones
- (a serious error, since the implementation of the format function
- can't know what types to pass to va_arg to find the later arguments).
- and for unused operands at the end of the format (if we know how many
- arguments the format had, so not for vprintf). If there were operand
- numbers out of range on a non-vprintf-style format, we won't have reached
- here. */
-
-static void
-finish_dollar_format_checking (status, res)
- int *status;
- format_check_results *res;
-{
- int i;
- for (i = 0; i < dollar_max_arg_used; i++)
- {
- if (!dollar_arguments_used[i])
- status_warning (status, "format argument %d unused before used argument %d in $-style format",
- i + 1, dollar_max_arg_used);
- }
- if (dollar_first_arg_num && dollar_max_arg_used < dollar_arguments_count)
- {
- res->number_other--;
- res->number_dollar_extra_args++;
- }
-}
-
-
-/* Retrieve the specification for a format flag. SPEC contains the
- specifications for format flags for the applicable kind of format.
- FLAG is the flag in question. If PREDICATES is NULL, the basic
- spec for that flag must be retrieved and this function aborts if
- it cannot be found. If PREDICATES is not NULL, it is a string listing
- possible predicates for the spec entry; if an entry predicated on any
- of these is found, it is returned, otherwise NULL is returned. */
-
-static const format_flag_spec *
-get_flag_spec (spec, flag, predicates)
- const format_flag_spec *spec;
- int flag;
- const char *predicates;
-{
- int i;
- for (i = 0; spec[i].flag_char != 0; i++)
- {
- if (spec[i].flag_char != flag)
- continue;
- if (predicates != NULL)
- {
- if (spec[i].predicate != 0
- && strchr (predicates, spec[i].predicate) != 0)
- return &spec[i];
- }
- else if (spec[i].predicate == 0)
- return &spec[i];
- }
- if (predicates == NULL)
- abort ();
- else
- return NULL;
-}
-
-
-/* Check the argument list of a call to printf, scanf, etc.
- INFO points to the function_format_info structure.
- PARAMS is the list of argument values. */
-
-static void
-check_format_info (status, info, params)
- int *status;
- function_format_info *info;
- tree params;
-{
- int arg_num;
- tree format_tree;
- format_check_results res;
- /* Skip to format argument. If the argument isn't available, there's
- no work for us to do; prototype checking will catch the problem. */
- for (arg_num = 1; ; ++arg_num)
- {
- if (params == 0)
- return;
- if (arg_num == info->format_num)
- break;
- params = TREE_CHAIN (params);
- }
- format_tree = TREE_VALUE (params);
- params = TREE_CHAIN (params);
- if (format_tree == 0)
- return;
-
- res.number_non_literal = 0;
- res.number_extra_args = 0;
- res.number_dollar_extra_args = 0;
- res.number_wide = 0;
- res.number_empty = 0;
- res.number_unterminated = 0;
- res.number_other = 0;
-
- check_format_info_recurse (status, &res, info, format_tree, params, arg_num);
-
- if (res.number_non_literal > 0)
- {
- /* Functions taking a va_list normally pass a non-literal format
- string. These functions typically are declared with
- first_arg_num == 0, so avoid warning in those cases. */
- if (!(format_types[info->format_type].flags & FMT_FLAG_ARG_CONVERT))
- {
- /* For strftime-like formats, warn for not checking the format
- string; but there are no arguments to check. */
- if (warn_format_nonliteral)
- status_warning (status, "format not a string literal, format string not checked");
- }
- else if (info->first_arg_num != 0)
- {
- /* If there are no arguments for the format at all, we may have
- printf (foo) which is likely to be a security hole. */
- while (arg_num + 1 < info->first_arg_num)
- {
- if (params == 0)
- break;
- params = TREE_CHAIN (params);
- ++arg_num;
- }
- if (params == 0 && (warn_format_nonliteral || warn_format_security))
- status_warning (status, "format not a string literal and no format arguments");
- else if (warn_format_nonliteral)
- status_warning (status, "format not a string literal, argument types not checked");
- }
- }
-
- /* If there were extra arguments to the format, normally warn. However,
- the standard does say extra arguments are ignored, so in the specific
- case where we have multiple leaves (conditional expressions or
- ngettext) allow extra arguments if at least one leaf didn't have extra
- arguments, but was otherwise OK (either non-literal or checked OK).
- If the format is an empty string, this should be counted similarly to the
- case of extra format arguments. */
- if (res.number_extra_args > 0 && res.number_non_literal == 0
- && res.number_other == 0 && warn_format_extra_args)
- status_warning (status, "too many arguments for format");
- if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
- && res.number_other == 0 && warn_format_extra_args)
- status_warning (status, "unused arguments in $-style format");
- if (res.number_empty > 0 && res.number_non_literal == 0
- && res.number_other == 0)
- status_warning (status, "zero-length format string");
-
- if (res.number_wide > 0)
- status_warning (status, "format is a wide character string");
-
- if (res.number_unterminated > 0)
- status_warning (status, "unterminated format string");
-}
-
-
-/* Recursively check a call to a format function. FORMAT_TREE is the
- format parameter, which may be a conditional expression in which
- both halves should be checked. ARG_NUM is the number of the
- format argument; PARAMS points just after it in the argument list. */
-
-static void
-check_format_info_recurse (status, res, info, format_tree, params, arg_num)
- int *status;
- format_check_results *res;
- function_format_info *info;
- tree format_tree;
- tree params;
- int arg_num;
-{
- int format_length;
- const char *format_chars;
- tree array_size = 0;
- tree array_init;
-
- if (TREE_CODE (format_tree) == NOP_EXPR)
- {
- /* Strip coercion. */
- check_format_info_recurse (status, res, info,
- TREE_OPERAND (format_tree, 0), params,
- arg_num);
- return;
- }
-
- if (TREE_CODE (format_tree) == CALL_EXPR
- && TREE_CODE (TREE_OPERAND (format_tree, 0)) == ADDR_EXPR
- && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0))
- == FUNCTION_DECL))
- {
- tree function = TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0);
-
- /* See if this is a call to a known internationalization function
- that modifies the format arg. */
- international_format_info *iinfo;
-
- for (iinfo = international_format_list; iinfo; iinfo = iinfo->next)
- if (iinfo->assembler_name
- ? (iinfo->assembler_name == DECL_ASSEMBLER_NAME (function))
- : (iinfo->name == DECL_NAME (function)))
- {
- tree inner_args;
- int i;
-
- for (inner_args = TREE_OPERAND (format_tree, 1), i = 1;
- inner_args != 0;
- inner_args = TREE_CHAIN (inner_args), i++)
- if (i == iinfo->format_num)
- {
- /* FIXME: with Marc Espie's __attribute__((nonnull))
- patch in GCC, we will have chained attributes,
- and be able to handle functions like ngettext
- with multiple format_arg attributes properly. */
- check_format_info_recurse (status, res, info,
- TREE_VALUE (inner_args), params,
- arg_num);
- return;
- }
- }
- }
-
- if (TREE_CODE (format_tree) == COND_EXPR)
- {
- /* Check both halves of the conditional expression. */
- check_format_info_recurse (status, res, info,
- TREE_OPERAND (format_tree, 1), params,
- arg_num);
- check_format_info_recurse (status, res, info,
- TREE_OPERAND (format_tree, 2), params,
- arg_num);
- return;
- }
-
- if (integer_zerop (format_tree))
- {
- /* FIXME: this warning should go away once Marc Espie's
- __attribute__((nonnull)) patch is in. Instead, checking for
- nonnull attributes should probably change this function to act
- specially if info == NULL and add a res->number_null entry for
- that case, or maybe add a function pointer to be called at
- the end instead of hardcoding check_format_info_main. */
- status_warning (status, "null format string");
-
- /* Skip to first argument to check, so we can see if this format
- has any arguments (it shouldn't). */
- while (arg_num + 1 < info->first_arg_num)
- {
- if (params == 0)
- return;
- params = TREE_CHAIN (params);
- ++arg_num;
- }
-
- if (params == 0)
- res->number_other++;
- else
- res->number_extra_args++;
-
- return;
- }
-
- if (TREE_CODE (format_tree) != ADDR_EXPR)
- {
- res->number_non_literal++;
- return;
- }
- format_tree = TREE_OPERAND (format_tree, 0);
- if (TREE_CODE (format_tree) == VAR_DECL
- && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE
- && (array_init = decl_constant_value (format_tree)) != format_tree
- && TREE_CODE (array_init) == STRING_CST)
- {
- /* Extract the string constant initializer. Note that this may include
- a trailing NUL character that is not in the array (e.g.
- const char a[3] = "foo";). */
- array_size = DECL_SIZE_UNIT (format_tree);
- format_tree = array_init;
- }
- if (TREE_CODE (format_tree) != STRING_CST)
- {
- res->number_non_literal++;
- return;
- }
- if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
- {
- res->number_wide++;
- return;
- }
- format_chars = TREE_STRING_POINTER (format_tree);
- format_length = TREE_STRING_LENGTH (format_tree);
- if (array_size != 0)
- {
- /* Variable length arrays can't be initialized. */
- if (TREE_CODE (array_size) != INTEGER_CST)
- abort ();
- if (host_integerp (array_size, 0))
- {
- HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size);
- if (array_size_value > 0
- && array_size_value == (int) array_size_value
- && format_length > array_size_value)
- format_length = array_size_value;
- }
- }
- if (format_length < 1)
- {
- res->number_unterminated++;
- return;
- }
- if (format_length == 1)
- {
- res->number_empty++;
- return;
- }
- if (format_chars[--format_length] != 0)
- {
- res->number_unterminated++;
- return;
- }
-
- /* Skip to first argument to check. */
- while (arg_num + 1 < info->first_arg_num)
- {
- if (params == 0)
- return;
- params = TREE_CHAIN (params);
- ++arg_num;
- }
- /* Provisionally increment res->number_other; check_format_info_main
- will decrement it if it finds there are extra arguments, but this way
- need not adjust it for every return. */
- res->number_other++;
- check_format_info_main (status, res, info, format_chars, format_length,
- params, arg_num);
-}
-
-
-/* Do the main part of checking a call to a format function. FORMAT_CHARS
- is the NUL-terminated format string (which at this point may contain
- internal NUL characters); FORMAT_LENGTH is its length (excluding the
- terminating NUL character). ARG_NUM is one less than the number of
- the first format argument to check; PARAMS points to that format
- argument in the list of arguments. */
-
-static void
-check_format_info_main (status, res, info, format_chars, format_length,
- params, arg_num)
- int *status;
- format_check_results *res;
- function_format_info *info;
- const char *format_chars;
- int format_length;
- tree params;
- int arg_num;
-{
- const char *orig_format_chars = format_chars;
- tree first_fillin_param = params;
-
- const format_kind_info *fki = &format_types[info->format_type];
- const format_flag_spec *flag_specs = fki->flag_specs;
- const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs;
-
- /* -1 if no conversions taking an operand have been found; 0 if one has
- and it didn't use $; 1 if $ formats are in use. */
- int has_operand_number = -1;
-
- init_dollar_format_checking (info->first_arg_num, first_fillin_param);
-
- while (1)
- {
- int i;
- int suppressed = FALSE;
- const char *length_chars = NULL;
- enum format_lengths length_chars_val = FMT_LEN_none;
- enum format_std_version length_chars_std = STD_C89;
- int format_char;
- tree cur_param;
- tree wanted_type;
- int main_arg_num = 0;
- tree main_arg_params = 0;
- enum format_std_version wanted_type_std;
- const char *wanted_type_name;
- format_wanted_type width_wanted_type;
- format_wanted_type precision_wanted_type;
- format_wanted_type main_wanted_type;
- format_wanted_type *first_wanted_type = NULL;
- format_wanted_type *last_wanted_type = NULL;
- const format_length_info *fli = NULL;
- const format_char_info *fci = NULL;
- char flag_chars[256];
- int aflag = 0;
- if (*format_chars == 0)
- {
- if (format_chars - orig_format_chars != format_length)
- status_warning (status, "embedded `\\0' in format");
- if (info->first_arg_num != 0 && params != 0
- && has_operand_number <= 0)
- {
- res->number_other--;
- res->number_extra_args++;
- }
- if (has_operand_number > 0)
- finish_dollar_format_checking (status, res);
- return;
- }
- if (*format_chars++ != '%')
- continue;
- if (*format_chars == 0)
- {
- status_warning (status, "spurious trailing `%%' in format");
- continue;
- }
- if (*format_chars == '%')
- {
- ++format_chars;
- continue;
- }
- flag_chars[0] = 0;
-
- if ((fki->flags & FMT_FLAG_USE_DOLLAR) && has_operand_number != 0)
- {
- /* Possibly read a $ operand number at the start of the format.
- If one was previously used, one is required here. If one
- is not used here, we can't immediately conclude this is a
- format without them, since it could be printf %m or scanf %*. */
- int opnum;
- opnum = maybe_read_dollar_number (status, &format_chars, 0,
- first_fillin_param,
- &main_arg_params, fki);
- if (opnum == -1)
- return;
- else if (opnum > 0)
- {
- has_operand_number = 1;
- main_arg_num = opnum + info->first_arg_num - 1;
- }
- }
-
- /* Read any format flags, but do not yet validate them beyond removing
- duplicates, since in general validation depends on the rest of
- the format. */
- while (*format_chars != 0
- && strchr (fki->flag_chars, *format_chars) != 0)
- {
- const format_flag_spec *s = get_flag_spec (flag_specs,
- *format_chars, NULL);
- if (strchr (flag_chars, *format_chars) != 0)
- {
- status_warning (status, "repeated %s in format", _(s->name));
- }
- else
- {
- i = strlen (flag_chars);
- flag_chars[i++] = *format_chars;
- flag_chars[i] = 0;
- }
- if (s->skip_next_char)
- {
- ++format_chars;
- if (*format_chars == 0)
- {
- status_warning (status, "missing fill character at end of strfmon format");
- return;
- }
- }
- ++format_chars;
- }
-
- /* Read any format width, possibly * or *m$. */
- if (fki->width_char != 0)
- {
- if (fki->width_type != NULL && *format_chars == '*')
- {
- i = strlen (flag_chars);
- flag_chars[i++] = fki->width_char;
- flag_chars[i] = 0;
- /* "...a field width...may be indicated by an asterisk.
- In this case, an int argument supplies the field width..." */
- ++format_chars;
- if (params == 0)
- {
- status_warning (status, "too few arguments for format");
- return;
- }
- if (has_operand_number != 0)
- {
- int opnum;
- opnum = maybe_read_dollar_number (status, &format_chars,
- has_operand_number == 1,
- first_fillin_param,
- ¶ms, fki);
- if (opnum == -1)
- return;
- else if (opnum > 0)
- {
- has_operand_number = 1;
- arg_num = opnum + info->first_arg_num - 1;
- }
- else
- has_operand_number = 0;
- }
- if (info->first_arg_num != 0)
- {
- cur_param = TREE_VALUE (params);
- if (has_operand_number <= 0)
- {
- params = TREE_CHAIN (params);
- ++arg_num;
- }
- width_wanted_type.wanted_type = *fki->width_type;
- width_wanted_type.wanted_type_name = NULL;
- width_wanted_type.pointer_count = 0;
- width_wanted_type.char_lenient_flag = 0;
- width_wanted_type.writing_in_flag = 0;
- width_wanted_type.reading_from_flag = 0;
- width_wanted_type.name = _("field width");
- width_wanted_type.param = cur_param;
- width_wanted_type.arg_num = arg_num;
- width_wanted_type.next = NULL;
- if (last_wanted_type != 0)
- last_wanted_type->next = &width_wanted_type;
- if (first_wanted_type == 0)
- first_wanted_type = &width_wanted_type;
- last_wanted_type = &width_wanted_type;
- }
- }
- else
- {
- /* Possibly read a numeric width. If the width is zero,
- we complain if appropriate. */
- int non_zero_width_char = FALSE;
- int found_width = FALSE;
- while (ISDIGIT (*format_chars))
- {
- found_width = TRUE;
- if (*format_chars != '0')
- non_zero_width_char = TRUE;
- ++format_chars;
- }
- if (found_width && !non_zero_width_char &&
- (fki->flags & FMT_FLAG_ZERO_WIDTH_BAD))
- status_warning (status, "zero width in %s format",
- fki->name);
- if (found_width)
- {
- i = strlen (flag_chars);
- flag_chars[i++] = fki->width_char;
- flag_chars[i] = 0;
- }
- }
- }
-
- /* Read any format left precision (must be a number, not *). */
- if (fki->left_precision_char != 0 && *format_chars == '#')
- {
- ++format_chars;
- i = strlen (flag_chars);
- flag_chars[i++] = fki->left_precision_char;
- flag_chars[i] = 0;
- if (!ISDIGIT (*format_chars))
- status_warning (status, "empty left precision in %s format",
- fki->name);
- while (ISDIGIT (*format_chars))
- ++format_chars;
- }
-
- /* Read any format precision, possibly * or *m$. */
- if (fki->precision_char != 0 && *format_chars == '.')
- {
- ++format_chars;
- i = strlen (flag_chars);
- flag_chars[i++] = fki->precision_char;
- flag_chars[i] = 0;
- if (fki->precision_type != NULL && *format_chars == '*')
- {
- /* "...a...precision...may be indicated by an asterisk.
- In this case, an int argument supplies the...precision." */
- ++format_chars;
- if (has_operand_number != 0)
- {
- int opnum;
- opnum = maybe_read_dollar_number (status, &format_chars,
- has_operand_number == 1,
- first_fillin_param,
- ¶ms, fki);
- if (opnum == -1)
- return;
- else if (opnum > 0)
- {
- has_operand_number = 1;
- arg_num = opnum + info->first_arg_num - 1;
- }
- else
- has_operand_number = 0;
- }
- if (info->first_arg_num != 0)
- {
- if (params == 0)
- {
- status_warning (status, "too few arguments for format");
- return;
- }
- cur_param = TREE_VALUE (params);
- if (has_operand_number <= 0)
- {
- params = TREE_CHAIN (params);
- ++arg_num;
- }
- precision_wanted_type.wanted_type = *fki->precision_type;
- precision_wanted_type.wanted_type_name = NULL;
- precision_wanted_type.pointer_count = 0;
- precision_wanted_type.char_lenient_flag = 0;
- precision_wanted_type.writing_in_flag = 0;
- precision_wanted_type.reading_from_flag = 0;
- precision_wanted_type.name = _("field precision");
- precision_wanted_type.param = cur_param;
- precision_wanted_type.arg_num = arg_num;
- precision_wanted_type.next = NULL;
- if (last_wanted_type != 0)
- last_wanted_type->next = &precision_wanted_type;
- if (first_wanted_type == 0)
- first_wanted_type = &precision_wanted_type;
- last_wanted_type = &precision_wanted_type;
- }
- }
- else
- {
- if (!(fki->flags & FMT_FLAG_EMPTY_PREC_OK)
- && !ISDIGIT (*format_chars))
- status_warning (status, "empty precision in %s format",
- fki->name);
- while (ISDIGIT (*format_chars))
- ++format_chars;
- }
- }
-
- /* Read any length modifier, if this kind of format has them. */
- fli = fki->length_char_specs;
- length_chars = NULL;
- length_chars_val = FMT_LEN_none;
- length_chars_std = STD_C89;
- if (fli)
- {
- while (fli->name != 0 && fli->name[0] != *format_chars)
- fli++;
- if (fli->name != 0)
- {
- format_chars++;
- if (fli->double_name != 0 && fli->name[0] == *format_chars)
- {
- format_chars++;
- length_chars = fli->double_name;
- length_chars_val = fli->double_index;
- length_chars_std = fli->double_std;
- }
- else
- {
- length_chars = fli->name;
- length_chars_val = fli->index;
- length_chars_std = fli->std;
- }
- i = strlen (flag_chars);
- flag_chars[i++] = fki->length_code_char;
- flag_chars[i] = 0;
- }
- if (pedantic)
- {
- /* Warn if the length modifier is non-standard. */
- if (ADJ_STD (length_chars_std) > C_STD_VER)
- status_warning (status, "%s does not support the `%s' %s length modifier",
- C_STD_NAME (length_chars_std), length_chars,
- fki->name);
- }
- }
-
- /* Read any modifier (strftime E/O). */
- if (fki->modifier_chars != NULL)
- {
- while (*format_chars != 0
- && strchr (fki->modifier_chars, *format_chars) != 0)
- {
- if (strchr (flag_chars, *format_chars) != 0)
- {
- const format_flag_spec *s = get_flag_spec (flag_specs,
- *format_chars, NULL);
- status_warning (status, "repeated %s in format", _(s->name));
- }
- else
- {
- i = strlen (flag_chars);
- flag_chars[i++] = *format_chars;
- flag_chars[i] = 0;
- }
- ++format_chars;
- }
- }
-
- /* Handle the scanf allocation kludge. */
- if (fki->flags & FMT_FLAG_SCANF_A_KLUDGE)
- {
- if (*format_chars == 'a' && !flag_isoc99)
- {
- if (format_chars[1] == 's' || format_chars[1] == 'S'
- || format_chars[1] == '[')
- {
- /* `a' is used as a flag. */
- i = strlen (flag_chars);
- flag_chars[i++] = 'a';
- flag_chars[i] = 0;
- format_chars++;
- }
- }
- }
-
- format_char = *format_chars;
- if (format_char == 0
- || (!(fki->flags & FMT_FLAG_FANCY_PERCENT_OK) && format_char == '%'))
- {
- status_warning (status, "conversion lacks type at end of format");
- continue;
- }
- format_chars++;
- fci = fki->conversion_specs;
- while (fci->format_chars != 0
- && strchr (fci->format_chars, format_char) == 0)
- ++fci;
- if (fci->format_chars == 0)
- {
- if (ISGRAPH(format_char))
- status_warning (status, "unknown conversion type character `%c' in format",
- format_char);
- else
- status_warning (status, "unknown conversion type character 0x%x in format",
- format_char);
- continue;
- }
- if (pedantic)
- {
- if (ADJ_STD (fci->std) > C_STD_VER)
- status_warning (status, "%s does not support the `%%%c' %s format",
- C_STD_NAME (fci->std), format_char, fki->name);
- }
-
- /* Validate the individual flags used, removing any that are invalid. */
- {
- int d = 0;
- for (i = 0; flag_chars[i] != 0; i++)
- {
- const format_flag_spec *s = get_flag_spec (flag_specs,
- flag_chars[i], NULL);
- flag_chars[i - d] = flag_chars[i];
- if (flag_chars[i] == fki->length_code_char)
- continue;
- if (strchr (fci->flag_chars, flag_chars[i]) == 0)
- {
- status_warning (status, "%s used with `%%%c' %s format",
- _(s->name), format_char, fki->name);
- d++;
- continue;
- }
- if (pedantic)
- {
- const format_flag_spec *t;
- if (ADJ_STD (s->std) > C_STD_VER)
- status_warning (status, "%s does not support %s",
- C_STD_NAME (s->std), _(s->long_name));
- t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
- if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std))
- {
- const char *long_name = (t->long_name != NULL
- ? t->long_name
- : s->long_name);
- if (ADJ_STD (t->std) > C_STD_VER)
- status_warning (status, "%s does not support %s with the `%%%c' %s format",
- C_STD_NAME (t->std), _(long_name),
- format_char, fki->name);
- }
- }
- }
- flag_chars[i - d] = 0;
- }
-
- if ((fki->flags & FMT_FLAG_SCANF_A_KLUDGE)
- && strchr (flag_chars, 'a') != 0)
- aflag = 1;
-
- if (fki->suppression_char
- && strchr (flag_chars, fki->suppression_char) != 0)
- suppressed = 1;
-
- /* Validate the pairs of flags used. */
- for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
- {
- const format_flag_spec *s, *t;
- if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
- continue;
- if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
- continue;
- if (bad_flag_pairs[i].predicate != 0
- && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
- continue;
- s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
- t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
- if (bad_flag_pairs[i].ignored)
- {
- if (bad_flag_pairs[i].predicate != 0)
- status_warning (status, "%s ignored with %s and `%%%c' %s format",
- _(s->name), _(t->name), format_char,
- fki->name);
- else
- status_warning (status, "%s ignored with %s in %s format",
- _(s->name), _(t->name), fki->name);
- }
- else
- {
- if (bad_flag_pairs[i].predicate != 0)
- status_warning (status, "use of %s and %s together with `%%%c' %s format",
- _(s->name), _(t->name), format_char,
- fki->name);
- else
- status_warning (status, "use of %s and %s together in %s format",
- _(s->name), _(t->name), fki->name);
- }
- }
-
- /* Give Y2K warnings. */
- if (warn_format_y2k)
- {
- int y2k_level = 0;
- if (strchr (fci->flags2, '4') != 0)
- if (strchr (flag_chars, 'E') != 0)
- y2k_level = 3;
- else
- y2k_level = 2;
- else if (strchr (fci->flags2, '3') != 0)
- y2k_level = 3;
- else if (strchr (fci->flags2, '2') != 0)
- y2k_level = 2;
- if (y2k_level == 3)
- status_warning (status, "`%%%c' yields only last 2 digits of year in some locales",
- format_char);
- else if (y2k_level == 2)
- status_warning (status, "`%%%c' yields only last 2 digits of year", format_char);
- }
-
- if (strchr (fci->flags2, '[') != 0)
- {
- /* Skip over scan set, in case it happens to have '%' in it. */
- if (*format_chars == '^')
- ++format_chars;
- /* Find closing bracket; if one is hit immediately, then
- it's part of the scan set rather than a terminator. */
- if (*format_chars == ']')
- ++format_chars;
- while (*format_chars && *format_chars != ']')
- ++format_chars;
- if (*format_chars != ']')
- /* The end of the format string was reached. */
- status_warning (status, "no closing `]' for `%%[' format");
- }
-
- wanted_type = 0;
- wanted_type_name = 0;
- if (fki->flags & FMT_FLAG_ARG_CONVERT)
- {
- wanted_type = (fci->types[length_chars_val].type
- ? *fci->types[length_chars_val].type : 0);
- wanted_type_name = fci->types[length_chars_val].name;
- wanted_type_std = fci->types[length_chars_val].std;
- if (wanted_type == 0)
- {
- status_warning (status, "use of `%s' length modifier with `%c' type character",
- length_chars, format_char);
- /* Heuristic: skip one argument when an invalid length/type
- combination is encountered. */
- arg_num++;
- if (params == 0)
- {
- status_warning (status, "too few arguments for format");
- return;
- }
- params = TREE_CHAIN (params);
- continue;
- }
- else if (pedantic
- /* Warn if non-standard, provided it is more non-standard
- than the length and type characters that may already
- have been warned for. */
- && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std)
- && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std))
- {
- if (ADJ_STD (wanted_type_std) > C_STD_VER)
- status_warning (status, "%s does not support the `%%%s%c' %s format",
- C_STD_NAME (wanted_type_std), length_chars,
- format_char, fki->name);
- }
- }
-
- /* Finally. . .check type of argument against desired type! */
- if (info->first_arg_num == 0)
- continue;
- if ((fci->pointer_count == 0 && wanted_type == void_type_node)
- || suppressed)
- {
- if (main_arg_num != 0)
- {
- if (suppressed)
- status_warning (status, "operand number specified with suppressed assignment");
- else
- status_warning (status, "operand number specified for format taking no argument");
- }
- }
- else
- {
- if (main_arg_num != 0)
- {
- arg_num = main_arg_num;
- params = main_arg_params;
- }
- else
- {
- ++arg_num;
- if (has_operand_number > 0)
- {
- status_warning (status, "missing $ operand number in format");
- return;
- }
- else
- has_operand_number = 0;
- if (params == 0)
- {
- status_warning (status, "too few arguments for format");
- return;
- }
- }
- cur_param = TREE_VALUE (params);
- params = TREE_CHAIN (params);
- main_wanted_type.wanted_type = wanted_type;
- main_wanted_type.wanted_type_name = wanted_type_name;
- main_wanted_type.pointer_count = fci->pointer_count + aflag;
- main_wanted_type.char_lenient_flag = 0;
- if (strchr (fci->flags2, 'c') != 0)
- main_wanted_type.char_lenient_flag = 1;
- main_wanted_type.writing_in_flag = 0;
- main_wanted_type.reading_from_flag = 0;
- if (aflag)
- main_wanted_type.writing_in_flag = 1;
- else
- {
- if (strchr (fci->flags2, 'W') != 0)
- main_wanted_type.writing_in_flag = 1;
- if (strchr (fci->flags2, 'R') != 0)
- main_wanted_type.reading_from_flag = 1;
- }
- main_wanted_type.name = NULL;
- main_wanted_type.param = cur_param;
- main_wanted_type.arg_num = arg_num;
- main_wanted_type.next = NULL;
- if (last_wanted_type != 0)
- last_wanted_type->next = &main_wanted_type;
- if (first_wanted_type == 0)
- first_wanted_type = &main_wanted_type;
- last_wanted_type = &main_wanted_type;
- }
-
- if (first_wanted_type != 0)
- check_format_types (status, first_wanted_type);
-
- }
-}
-
-
-/* Check the argument types from a single format conversion (possibly
- including width and precision arguments). */
-static void
-check_format_types (status, types)
- int *status;
- format_wanted_type *types;
-{
- for (; types != 0; types = types->next)
- {
- tree cur_param;
- tree cur_type;
- tree orig_cur_type;
- tree wanted_type;
- tree promoted_type;
- int arg_num;
- int i;
- int char_type_flag;
- cur_param = types->param;
- cur_type = TREE_TYPE (cur_param);
- if (cur_type == error_mark_node)
- continue;
- char_type_flag = 0;
- wanted_type = types->wanted_type;
- arg_num = types->arg_num;
-
- /* The following should not occur here. */
- if (wanted_type == 0)
- abort ();
- if (wanted_type == void_type_node && types->pointer_count == 0)
- abort ();
-
- if (types->pointer_count == 0)
- {
- promoted_type = simple_type_promotes_to (wanted_type);
- if (promoted_type != NULL_TREE)
- wanted_type = promoted_type;
- }
-
- STRIP_NOPS (cur_param);
-
- /* Check the types of any additional pointer arguments
- that precede the "real" argument. */
- for (i = 0; i < types->pointer_count; ++i)
- {
- if (TREE_CODE (cur_type) == POINTER_TYPE)
- {
- cur_type = TREE_TYPE (cur_type);
- if (cur_type == error_mark_node)
- break;
-
- /* Check for writing through a NULL pointer. */
- if (types->writing_in_flag
- && i == 0
- && cur_param != 0
- && integer_zerop (cur_param))
- status_warning (status,
- "writing through null pointer (arg %d)",
- arg_num);
-
- /* Check for reading through a NULL pointer. */
- if (types->reading_from_flag
- && i == 0
- && cur_param != 0
- && integer_zerop (cur_param))
- status_warning (status,
- "reading through null pointer (arg %d)",
- arg_num);
-
- if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
- cur_param = TREE_OPERAND (cur_param, 0);
- else
- cur_param = 0;
-
- /* See if this is an attempt to write into a const type with
- scanf or with printf "%n". Note: the writing in happens
- at the first indirection only, if for example
- void * const * is passed to scanf %p; passing
- const void ** is simply passing an incompatible type. */
- if (types->writing_in_flag
- && i == 0
- && (TYPE_READONLY (cur_type)
- || (cur_param != 0
- && (TREE_CODE_CLASS (TREE_CODE (cur_param)) == 'c'
- || (DECL_P (cur_param)
- && TREE_READONLY (cur_param))))))
- status_warning (status, "writing into constant object (arg %d)", arg_num);
-
- /* If there are extra type qualifiers beyond the first
- indirection, then this makes the types technically
- incompatible. */
- if (i > 0
- && pedantic
- && (TYPE_READONLY (cur_type)
- || TYPE_VOLATILE (cur_type)
- || TYPE_RESTRICT (cur_type)))
- status_warning (status, "extra type qualifiers in format argument (arg %d)",
- arg_num);
-
- }
- else
- {
- if (types->pointer_count == 1)
- status_warning (status, "format argument is not a pointer (arg %d)", arg_num);
- else
- status_warning (status, "format argument is not a pointer to a pointer (arg %d)", arg_num);
- break;
- }
- }
-
- if (i < types->pointer_count)
- continue;
-
- orig_cur_type = cur_type;
- cur_type = TYPE_MAIN_VARIANT (cur_type);
-
- /* Check whether the argument type is a character type. This leniency
- only applies to certain formats, flagged with 'c'.
- */
- if (types->char_lenient_flag)
- char_type_flag = (cur_type == char_type_node
- || cur_type == signed_char_type_node
- || cur_type == unsigned_char_type_node);
-
- /* Check the type of the "real" argument, if there's a type we want. */
- if (wanted_type == cur_type)
- continue;
- /* If we want `void *', allow any pointer type.
- (Anything else would already have got a warning.)
- With -pedantic, only allow pointers to void and to character
- types. */
- if (wanted_type == void_type_node
- && (!pedantic || (i == 1 && char_type_flag)))
- continue;
- /* Don't warn about differences merely in signedness, unless
- -pedantic. With -pedantic, warn if the type is a pointer
- target and not a character type, and for character types at
- a second level of indirection. */
- if (TREE_CODE (wanted_type) == INTEGER_TYPE
- && TREE_CODE (cur_type) == INTEGER_TYPE
- && (! pedantic || i == 0 || (i == 1 && char_type_flag))
- && (TREE_UNSIGNED (wanted_type)
- ? wanted_type == unsigned_type (cur_type)
- : wanted_type == signed_type (cur_type)))
- continue;
- /* Likewise, "signed char", "unsigned char" and "char" are
- equivalent but the above test won't consider them equivalent. */
- if (wanted_type == char_type_node
- && (! pedantic || i < 2)
- && char_type_flag)
- continue;
- /* Now we have a type mismatch. */
- {
- register const char *this;
- register const char *that;
-
- this = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (wanted_type)));
- that = 0;
- if (TYPE_NAME (orig_cur_type) != 0
- && TREE_CODE (orig_cur_type) != INTEGER_TYPE
- && !(TREE_CODE (orig_cur_type) == POINTER_TYPE
- && TREE_CODE (TREE_TYPE (orig_cur_type)) == INTEGER_TYPE))
- {
- if (TREE_CODE (TYPE_NAME (orig_cur_type)) == TYPE_DECL
- && DECL_NAME (TYPE_NAME (orig_cur_type)) != 0)
- that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (orig_cur_type)));
- else
- that = IDENTIFIER_POINTER (TYPE_NAME (orig_cur_type));
- }
-
- /* A nameless type can't possibly match what the format wants.
- So there will be a warning for it.
- Make up a string to describe vaguely what it is. */
- if (that == 0)
- {
- if (TREE_CODE (orig_cur_type) == POINTER_TYPE)
- that = "pointer";
- else
- that = "different type";
- }
-
- /* Make the warning better in case of mismatch of int vs long. */
- if (TREE_CODE (orig_cur_type) == INTEGER_TYPE
- && TREE_CODE (wanted_type) == INTEGER_TYPE
- && TYPE_PRECISION (orig_cur_type) == TYPE_PRECISION (wanted_type)
- && TYPE_NAME (orig_cur_type) != 0
- && TREE_CODE (TYPE_NAME (orig_cur_type)) == TYPE_DECL)
- that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (orig_cur_type)));
-
- if (strcmp (this, that) != 0)
- {
- /* There may be a better name for the format, e.g. size_t,
- but we should allow for programs with a perverse typedef
- making size_t something other than what the compiler
- thinks. */
- if (types->wanted_type_name != 0
- && strcmp (types->wanted_type_name, that) != 0)
- this = types->wanted_type_name;
- if (types->name != 0)
- status_warning (status, "%s is not type %s (arg %d)", types->name, this,
- arg_num);
- else
- status_warning (status, "%s format, %s arg (arg %d)", this, that, arg_num);
- }
- }
- }
-}
-
-/* Set format warning options according to a -Wformat=n option. */
-
-void
-set_Wformat (setting)
- int setting;
-{
- warn_format = setting;
- warn_format_y2k = setting;
- warn_format_extra_args = setting;
- if (setting != 1)
- {
- warn_format_nonliteral = setting;
- warn_format_security = setting;
- }
-}
\f
/* Print a warning if a constant expression had overflow in folding.
Invoke this function on every expression that the language
extern void init_function_format_info PARAMS ((void));
extern void check_function_format PARAMS ((int *, tree, tree, tree));
extern void set_Wformat PARAMS ((int));
+extern void decl_handle_format_attribute PARAMS ((tree, tree));
+extern void decl_handle_format_arg_attribute PARAMS ((tree, tree));
extern void c_apply_type_quals_to_decl PARAMS ((int, tree));
/* Print an error message for invalid operands to arith operation CODE.
NOP_EXPR is used as a special case (see truthvalue_conversion). */
--- /dev/null
+/* Check calls to formatted I/O functions (-Wformat).
+ Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
+ Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC 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 2, or (at your option)
+any later version.
+
+GNU CC 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 GNU CC; see the file COPYING. If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+#include "config.h"
+#include "system.h"
+#include "tree.h"
+#include "flags.h"
+#include "toplev.h"
+#include "c-common.h"
+#include "intl.h"
+#include "diagnostic.h"
+
+\f
+/* Command line options and their associated flags. */
+
+/* Warn about format/argument anomalies in calls to formatted I/O functions
+ (*printf, *scanf, strftime, strfmon, etc.). */
+
+int warn_format;
+
+/* Warn about Y2K problems with strftime formats. */
+
+int warn_format_y2k;
+
+/* Warn about excess arguments to formats. */
+
+int warn_format_extra_args;
+
+/* Warn about non-literal format arguments. */
+
+int warn_format_nonliteral;
+
+/* Warn about possible security problems with calls to format functions. */
+
+int warn_format_security;
+
+/* Set format warning options according to a -Wformat=n option. */
+
+void
+set_Wformat (setting)
+ int setting;
+{
+ warn_format = setting;
+ warn_format_y2k = setting;
+ warn_format_extra_args = setting;
+ if (setting != 1)
+ {
+ warn_format_nonliteral = setting;
+ warn_format_security = setting;
+ }
+}
+
+\f
+/* Handle attributes associated with format checking. */
+
+/* This must be in the same order as format_types, with format_type_error
+ last. */
+enum format_type { printf_format_type, scanf_format_type,
+ strftime_format_type, strfmon_format_type,
+ format_type_error };
+
+static enum format_type decode_format_type PARAMS ((const char *));
+static void record_function_format PARAMS ((tree, tree, enum format_type,
+ int, int));
+static void record_international_format PARAMS ((tree, tree, int));
+
+/* Handle the format attribute (with arguments ARGS) attached to the decl
+ DECL. It is already verified that DECL is a decl and ARGS contains
+ exactly three arguments. */
+
+void
+decl_handle_format_attribute (decl, args)
+ tree decl, args;
+{
+ tree type = TREE_TYPE (decl);
+ tree format_type_id = TREE_VALUE (args);
+ tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
+ tree first_arg_num_expr
+ = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
+ unsigned HOST_WIDE_INT format_num, first_arg_num;
+ enum format_type format_type;
+ tree argument;
+ unsigned int arg_num;
+
+ if (TREE_CODE (decl) != FUNCTION_DECL)
+ {
+ error_with_decl (decl,
+ "argument format specified for non-function `%s'");
+ return;
+ }
+
+ if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
+ {
+ error ("unrecognized format specifier");
+ return;
+ }
+ else
+ {
+ const char *p = IDENTIFIER_POINTER (format_type_id);
+
+ format_type = decode_format_type (p);
+
+ if (format_type == format_type_error)
+ {
+ warning ("`%s' is an unrecognized format function type", p);
+ return;
+ }
+ }
+
+ /* Strip any conversions from the string index and first arg number
+ and verify they are constants. */
+ while (TREE_CODE (format_num_expr) == NOP_EXPR
+ || TREE_CODE (format_num_expr) == CONVERT_EXPR
+ || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
+ format_num_expr = TREE_OPERAND (format_num_expr, 0);
+
+ while (TREE_CODE (first_arg_num_expr) == NOP_EXPR
+ || TREE_CODE (first_arg_num_expr) == CONVERT_EXPR
+ || TREE_CODE (first_arg_num_expr) == NON_LVALUE_EXPR)
+ first_arg_num_expr = TREE_OPERAND (first_arg_num_expr, 0);
+
+ if (TREE_CODE (format_num_expr) != INTEGER_CST
+ || TREE_INT_CST_HIGH (format_num_expr) != 0
+ || TREE_CODE (first_arg_num_expr) != INTEGER_CST
+ || TREE_INT_CST_HIGH (first_arg_num_expr) != 0)
+ {
+ error ("format string has invalid operand number");
+ return;
+ }
+
+ format_num = TREE_INT_CST_LOW (format_num_expr);
+ first_arg_num = TREE_INT_CST_LOW (first_arg_num_expr);
+ if (first_arg_num != 0 && first_arg_num <= format_num)
+ {
+ error ("format string arg follows the args to be formatted");
+ return;
+ }
+
+ /* If a parameter list is specified, verify that the format_num
+ argument is actually a string, in case the format attribute
+ is in error. */
+ argument = TYPE_ARG_TYPES (type);
+ if (argument)
+ {
+ for (arg_num = 1; argument != 0 && arg_num != format_num;
+ ++arg_num, argument = TREE_CHAIN (argument))
+ ;
+
+ if (! argument
+ || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
+ || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
+ != char_type_node))
+ {
+ error ("format string arg not a string type");
+ return;
+ }
+
+ else if (first_arg_num != 0)
+ {
+ /* Verify that first_arg_num points to the last arg,
+ the ... */
+ while (argument)
+ arg_num++, argument = TREE_CHAIN (argument);
+
+ if (arg_num != first_arg_num)
+ {
+ error ("args to be formatted is not '...'");
+ return;
+ }
+ }
+ }
+
+ if (format_type == strftime_format_type && first_arg_num != 0)
+ {
+ error ("strftime formats cannot format arguments");
+ return;
+ }
+
+ record_function_format (DECL_NAME (decl), DECL_ASSEMBLER_NAME (decl),
+ format_type, format_num, first_arg_num);
+}
+
+
+/* Handle the format_arg attribute (with arguments ARGS) attached to
+ the decl DECL. It is already verified that DECL is a decl and
+ ARGS contains exactly one argument. */
+
+void
+decl_handle_format_arg_attribute (decl, args)
+ tree decl, args;
+{
+ tree type = TREE_TYPE (decl);
+ tree format_num_expr = TREE_VALUE (args);
+ unsigned HOST_WIDE_INT format_num;
+ unsigned int arg_num;
+ tree argument;
+
+ if (TREE_CODE (decl) != FUNCTION_DECL)
+ {
+ error_with_decl (decl,
+ "argument format specified for non-function `%s'");
+ return;
+ }
+
+ /* Strip any conversions from the first arg number and verify it
+ is a constant. */
+ while (TREE_CODE (format_num_expr) == NOP_EXPR
+ || TREE_CODE (format_num_expr) == CONVERT_EXPR
+ || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
+ format_num_expr = TREE_OPERAND (format_num_expr, 0);
+
+ if (TREE_CODE (format_num_expr) != INTEGER_CST
+ || TREE_INT_CST_HIGH (format_num_expr) != 0)
+ {
+ error ("format string has invalid operand number");
+ return;
+ }
+
+ format_num = TREE_INT_CST_LOW (format_num_expr);
+
+ /* If a parameter list is specified, verify that the format_num
+ argument is actually a string, in case the format attribute
+ is in error. */
+ argument = TYPE_ARG_TYPES (type);
+ if (argument)
+ {
+ for (arg_num = 1; argument != 0 && arg_num != format_num;
+ ++arg_num, argument = TREE_CHAIN (argument))
+ ;
+
+ if (! argument
+ || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
+ || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
+ != char_type_node))
+ {
+ error ("format string arg not a string type");
+ return;
+ }
+ }
+
+ if (TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) != POINTER_TYPE
+ || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (TREE_TYPE (decl))))
+ != char_type_node))
+ {
+ error ("function does not return string type");
+ return;
+ }
+
+ record_international_format (DECL_NAME (decl), DECL_ASSEMBLER_NAME (decl),
+ format_num);
+}
+
+typedef struct function_format_info
+{
+ struct function_format_info *next; /* next structure on the list */
+ tree name; /* identifier such as "printf" */
+ tree assembler_name; /* optional mangled identifier (for C++) */
+ enum format_type format_type; /* type of format (printf, scanf, etc.) */
+ int format_num; /* number of format argument */
+ int first_arg_num; /* number of first arg (zero for varargs) */
+} function_format_info;
+
+static function_format_info *function_format_list = NULL;
+
+typedef struct international_format_info
+{
+ struct international_format_info *next; /* next structure on the list */
+ tree name; /* identifier such as "gettext" */
+ tree assembler_name; /* optional mangled identifier (for C++) */
+ int format_num; /* number of format argument */
+} international_format_info;
+
+static international_format_info *international_format_list = NULL;
+
+/* Initialize the table of functions to perform format checking on.
+ The ISO C functions are always checked (whether <stdio.h> is
+ included or not), since it is common to call printf without
+ including <stdio.h>. There shouldn't be a problem with this,
+ since ISO C reserves these function names whether you include the
+ header file or not. In any case, the checking is harmless. With
+ -ffreestanding, these default attributes are disabled, and must be
+ specified manually if desired.
+
+ Also initialize the name of function that modify the format string for
+ internationalization purposes. */
+
+void
+init_function_format_info ()
+{
+ if (flag_hosted)
+ {
+ /* Functions from ISO/IEC 9899:1990. */
+ record_function_format (get_identifier ("printf"), NULL_TREE,
+ printf_format_type, 1, 2);
+ record_function_format (get_identifier ("__builtin_printf"), NULL_TREE,
+ printf_format_type, 1, 2);
+ record_function_format (get_identifier ("fprintf"), NULL_TREE,
+ printf_format_type, 2, 3);
+ record_function_format (get_identifier ("__builtin_fprintf"), NULL_TREE,
+ printf_format_type, 2, 3);
+ record_function_format (get_identifier ("sprintf"), NULL_TREE,
+ printf_format_type, 2, 3);
+ record_function_format (get_identifier ("scanf"), NULL_TREE,
+ scanf_format_type, 1, 2);
+ record_function_format (get_identifier ("fscanf"), NULL_TREE,
+ scanf_format_type, 2, 3);
+ record_function_format (get_identifier ("sscanf"), NULL_TREE,
+ scanf_format_type, 2, 3);
+ record_function_format (get_identifier ("vprintf"), NULL_TREE,
+ printf_format_type, 1, 0);
+ record_function_format (get_identifier ("vfprintf"), NULL_TREE,
+ printf_format_type, 2, 0);
+ record_function_format (get_identifier ("vsprintf"), NULL_TREE,
+ printf_format_type, 2, 0);
+ record_function_format (get_identifier ("strftime"), NULL_TREE,
+ strftime_format_type, 3, 0);
+ }
+
+ if (flag_hosted && flag_isoc99)
+ {
+ /* ISO C99 adds the snprintf and vscanf family functions. */
+ record_function_format (get_identifier ("snprintf"), NULL_TREE,
+ printf_format_type, 3, 4);
+ record_function_format (get_identifier ("vsnprintf"), NULL_TREE,
+ printf_format_type, 3, 0);
+ record_function_format (get_identifier ("vscanf"), NULL_TREE,
+ scanf_format_type, 1, 0);
+ record_function_format (get_identifier ("vfscanf"), NULL_TREE,
+ scanf_format_type, 2, 0);
+ record_function_format (get_identifier ("vsscanf"), NULL_TREE,
+ scanf_format_type, 2, 0);
+ }
+
+ if (flag_hosted && flag_noniso_default_format_attributes)
+ {
+ /* Uniforum/GNU gettext functions, not in ISO C. */
+ record_international_format (get_identifier ("gettext"), NULL_TREE, 1);
+ record_international_format (get_identifier ("dgettext"), NULL_TREE, 2);
+ record_international_format (get_identifier ("dcgettext"), NULL_TREE, 2);
+ /* X/Open strfmon function. */
+ record_function_format (get_identifier ("strfmon"), NULL_TREE,
+ strfmon_format_type, 3, 4);
+ }
+}
+
+/* Record information for argument format checking. FUNCTION_IDENT is
+ the identifier node for the name of the function to check (its decl
+ need not exist yet).
+ FORMAT_TYPE specifies the type of format checking. FORMAT_NUM is the number
+ of the argument which is the format control string (starting from 1).
+ FIRST_ARG_NUM is the number of the first actual argument to check
+ against the format string, or zero if no checking is not be done
+ (e.g. for varargs such as vfprintf). */
+
+static void
+record_function_format (name, assembler_name, format_type,
+ format_num, first_arg_num)
+ tree name;
+ tree assembler_name;
+ enum format_type format_type;
+ int format_num;
+ int first_arg_num;
+{
+ function_format_info *info;
+
+ /* Re-use existing structure if it's there. */
+
+ for (info = function_format_list; info; info = info->next)
+ {
+ if (info->name == name && info->assembler_name == assembler_name)
+ break;
+ }
+ if (! info)
+ {
+ info = (function_format_info *) xmalloc (sizeof (function_format_info));
+ info->next = function_format_list;
+ function_format_list = info;
+
+ info->name = name;
+ info->assembler_name = assembler_name;
+ }
+
+ info->format_type = format_type;
+ info->format_num = format_num;
+ info->first_arg_num = first_arg_num;
+}
+
+/* Record information for the names of function that modify the format
+ argument to format functions. FUNCTION_IDENT is the identifier node for
+ the name of the function (its decl need not exist yet) and FORMAT_NUM is
+ the number of the argument which is the format control string (starting
+ from 1). */
+
+static void
+record_international_format (name, assembler_name, format_num)
+ tree name;
+ tree assembler_name;
+ int format_num;
+{
+ international_format_info *info;
+
+ /* Re-use existing structure if it's there. */
+
+ for (info = international_format_list; info; info = info->next)
+ {
+ if (info->name == name && info->assembler_name == assembler_name)
+ break;
+ }
+
+ if (! info)
+ {
+ info
+ = (international_format_info *)
+ xmalloc (sizeof (international_format_info));
+ info->next = international_format_list;
+ international_format_list = info;
+
+ info->name = name;
+ info->assembler_name = assembler_name;
+ }
+
+ info->format_num = format_num;
+}
+
+
+
+\f
+/* Check a call to a format function against a parameter list. */
+
+/* The meaningfully distinct length modifiers for format checking recognised
+ 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_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
+};
+
+/* The C standard version C++ is treated as equivalent to
+ or inheriting from, for the purpose of format features supported. */
+#define CPLUSPLUS_STD_VER STD_C89
+/* The C standard version we are checking formats against when pedantic. */
+#define C_STD_VER (c_language == clk_cplusplus \
+ ? CPLUSPLUS_STD_VER \
+ : (flag_isoc99 \
+ ? STD_C99 \
+ : (flag_isoc94 ? STD_C94 : STD_C89)))
+/* The name to give to the standard version we are warning about when
+ pedantic. FEATURE_VER is the version in which the feature warned out
+ appeared, which is higher than C_STD_VER. */
+#define C_STD_NAME(FEATURE_VER) (c_language == clk_cplusplus \
+ ? "ISO C++" \
+ : ((FEATURE_VER) == STD_EXT \
+ ? "ISO C" \
+ : "ISO C89"))
+/* Adjust a C standard version, which may be STD_C9L, to account for
+ -Wno-long-long. Returns other standard versions unchanged. */
+#define ADJ_STD(VER) ((int)((VER) == STD_C9L \
+ ? (warn_long_long ? STD_C99 : STD_C89) \
+ : (VER)))
+
+/* 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
+ /* 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". */
+typedef struct
+{
+ /* Name of the single-character length modifier. */
+ 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;
+} format_length_info;
+
+
+/* Structure desribing the combination of a conversion specifier
+ (or a set of specifiers which act identically) and a length modifier. */
+typedef struct
+{
+ /* 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;
+} format_type_detail;
+
+
+/* Macros to fill out tables of these. */
+#define BADLEN { 0, NULL, NULL }
+#define NOLENGTHS { BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }
+
+
+/* Structure desribing a format conversion specifier (or a set of specifiers
+ which act identically), and the length modifiers used with it. */
+typedef struct
+{
+ 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. */
+ const char *flags2;
+} format_char_info;
+
+
+/* Structure describing a flag accepted by some kind of format. */
+typedef struct
+{
+ /* 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
+ non-zero 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;
+ /* 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;
+} format_flag_spec;
+
+
+/* Structure describing a combination of flags that is bad for some kind
+ of format. */
+typedef struct
+{
+ /* The first flag character in question (0 for end of array). */
+ int flag_char1;
+ /* The second flag character. */
+ int flag_char2;
+ /* Non-zero 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 non-zero character from flags2 if it only applies in some
+ circumstances (e.g. 'i' for printf formats ignoring 0 with precision). */
+ int predicate;
+} format_flag_pair;
+
+
+/* Structure describing a particular kind of format processed by GCC. */
+typedef struct
+{
+ /* 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;
+ /* 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;
+} format_kind_info;
+
+
+/* Structure describing details of a type expected in format checking,
+ and the type to check against it. */
+typedef struct format_wanted_type
+{
+ /* The type wanted. */
+ tree wanted_type;
+ /* The name of this type to use in diagnostics. */
+ const char *wanted_type_name;
+ /* The level of indirection through pointers at which this type occurs. */
+ int pointer_count;
+ /* Whether, when pointer_count is 1, to allow any character type when
+ pedantic, rather than just the character or void type specified. */
+ int char_lenient_flag;
+ /* Whether the argument, dereferenced once, is written into and so the
+ argument must not be a pointer to a const-qualified type. */
+ int writing_in_flag;
+ /* Whether the argument, dereferenced once, is read from and so
+ must not be a NULL pointer. */
+ int reading_from_flag;
+ /* If warnings should be of the form "field precision is not type int",
+ the name to use (in this case "field precision"), otherwise NULL,
+ for "%s format, %s arg" type messages. If (in an extension), this
+ is a pointer type, wanted_type_name should be set to include the
+ terminating '*' characters of the type name to give a correct
+ message. */
+ const char *name;
+ /* The actual parameter to check against the wanted type. */
+ tree param;
+ /* The argument number of that parameter. */
+ int arg_num;
+ /* The next type to check for this format conversion, or NULL if none. */
+ struct format_wanted_type *next;
+} format_wanted_type;
+
+
+static const format_length_info printf_length_specs[] =
+{
+ { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
+ { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
+ { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
+ { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
+ { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
+ { "Z", FMT_LEN_z, STD_EXT, NULL, 0, 0 },
+ { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
+ { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
+ { NULL, 0, 0, NULL, 0, 0 }
+};
+
+
+/* This differs from printf_length_specs only in that "Z" is not accepted. */
+static const format_length_info scanf_length_specs[] =
+{
+ { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
+ { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
+ { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
+ { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
+ { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
+ { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
+ { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
+ { NULL, 0, 0, NULL, 0, 0 }
+};
+
+
+/* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings
+ make no sense for a format type not part of any C standard version. */
+static const format_length_info strfmon_length_specs[] =
+{
+ /* A GNU extension. */
+ { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
+ { NULL, 0, 0, NULL, 0, 0 }
+};
+
+static const format_flag_spec printf_flag_specs[] =
+{
+ { ' ', 0, 0, N_("` ' flag"), N_("the ` ' printf flag"), STD_C89 },
+ { '+', 0, 0, N_("`+' flag"), N_("the `+' printf flag"), STD_C89 },
+ { '#', 0, 0, N_("`#' flag"), N_("the `#' printf flag"), STD_C89 },
+ { '0', 0, 0, N_("`0' flag"), N_("the `0' printf flag"), STD_C89 },
+ { '-', 0, 0, N_("`-' flag"), N_("the `-' printf flag"), STD_C89 },
+ { '\'', 0, 0, N_("`'' flag"), N_("the `'' printf flag"), STD_EXT },
+ { 'I', 0, 0, N_("`I' flag"), N_("the `I' printf flag"), STD_EXT },
+ { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
+ { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
+ { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
+ { 0, 0, 0, NULL, NULL, 0 }
+};
+
+
+static const format_flag_pair printf_flag_pairs[] =
+{
+ { ' ', '+', 1, 0 },
+ { '0', '-', 1, 0 },
+ { '0', 'p', 1, 'i' },
+ { 0, 0, 0, 0 }
+};
+
+
+static const format_flag_spec scanf_flag_specs[] =
+{
+ { '*', 0, 0, N_("assignment suppression"), N_("assignment suppression"), STD_C89 },
+ { 'a', 0, 0, N_("`a' flag"), N_("the `a' scanf flag"), STD_EXT },
+ { 'w', 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89 },
+ { 'L', 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 },
+ { '\'', 0, 0, N_("`'' flag"), N_("the `'' scanf flag"), STD_EXT },
+ { 'I', 0, 0, N_("`I' flag"), N_("the `I' scanf flag"), STD_EXT },
+ { 0, 0, 0, NULL, NULL, 0 }
+};
+
+
+static const format_flag_pair scanf_flag_pairs[] =
+{
+ { '*', 'L', 0, 0 },
+ { 0, 0, 0, 0 }
+};
+
+
+static const format_flag_spec strftime_flag_specs[] =
+{
+ { '_', 0, 0, N_("`_' flag"), N_("the `_' strftime flag"), STD_EXT },
+ { '-', 0, 0, N_("`-' flag"), N_("the `-' strftime flag"), STD_EXT },
+ { '0', 0, 0, N_("`0' flag"), N_("the `0' strftime flag"), STD_EXT },
+ { '^', 0, 0, N_("`^' flag"), N_("the `^' strftime flag"), STD_EXT },
+ { '#', 0, 0, N_("`#' flag"), N_("the `#' strftime flag"), STD_EXT },
+ { 'w', 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT },
+ { 'E', 0, 0, N_("`E' modifier"), N_("the `E' strftime modifier"), STD_C99 },
+ { 'O', 0, 0, N_("`O' modifier"), N_("the `O' strftime modifier"), STD_C99 },
+ { 'O', 'o', 0, NULL, N_("the `O' modifier"), STD_EXT },
+ { 0, 0, 0, NULL, NULL, 0 }
+};
+
+
+static const format_flag_pair strftime_flag_pairs[] =
+{
+ { 'E', 'O', 0, 0 },
+ { '_', '-', 0, 0 },
+ { '_', '0', 0, 0 },
+ { '-', '0', 0, 0 },
+ { '^', '#', 0, 0 },
+ { 0, 0, 0, 0 }
+};
+
+
+static const format_flag_spec strfmon_flag_specs[] =
+{
+ { '=', 0, 1, N_("fill character"), N_("fill character in strfmon format"), STD_C89 },
+ { '^', 0, 0, N_("`^' flag"), N_("the `^' strfmon flag"), STD_C89 },
+ { '+', 0, 0, N_("`+' flag"), N_("the `+' strfmon flag"), STD_C89 },
+ { '(', 0, 0, N_("`(' flag"), N_("the `(' strfmon flag"), STD_C89 },
+ { '!', 0, 0, N_("`!' flag"), N_("the `!' strfmon flag"), STD_C89 },
+ { '-', 0, 0, N_("`-' flag"), N_("the `-' strfmon flag"), STD_C89 },
+ { 'w', 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89 },
+ { '#', 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89 },
+ { 'p', 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89 },
+ { 'L', 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89 },
+ { 0, 0, 0, NULL, NULL, 0 }
+};
+
+static const format_flag_pair strfmon_flag_pairs[] =
+{
+ { '+', '(', 0, 0 },
+ { 0, 0, 0, 0 }
+};
+
+
+#define T_I &integer_type_node
+#define T89_I { STD_C89, NULL, T_I }
+#define T99_I { STD_C99, 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 T99_UI { STD_C99, 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_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 &c_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 }
+
+static const format_char_info print_char_table[] =
+{
+ /* C89 conversion specifiers. */
+ { "di", 0, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, TEX_LL, T99_SST, T99_PD, T99_IM }, "-wp0 +'I", "i" },
+ { "oxX", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "-wp0#", "i" },
+ { "u", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "-wp0'I", "i" },
+ { "fgG", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#'", "" },
+ { "eE", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "" },
+ { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "" },
+ { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR" },
+ { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c" },
+ { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, BADLEN, T99_SST, T99_PD, T99_IM }, "", "W" },
+ /* C99 conversion specifiers. */
+ { "F", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#'", "" },
+ { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "" },
+ /* X/Open conversion specifiers. */
+ { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "" },
+ { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R" },
+ /* GNU conversion specifiers. */
+ { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "" },
+ { NULL, 0, 0, NOLENGTHS, NULL, NULL }
+};
+
+static const format_char_info scan_char_table[] =
+{
+ /* C89 conversion specifiers. */
+ { "di", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, TEX_LL, T99_SST, T99_PD, T99_IM }, "*w'I", "W" },
+ { "u", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "*w'I", "W" },
+ { "oxX", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "*w", "W" },
+ { "efgEG", 1, STD_C89, { T89_F, BADLEN, BADLEN, T89_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "*w'", "W" },
+ { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "cW" },
+ { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW" },
+ { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW[" },
+ { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W" },
+ { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, BADLEN, T99_SST, T99_PD, T99_IM }, "", "W" },
+ /* C99 conversion specifiers. */
+ { "FaA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "*w'", "W" },
+ /* X/Open conversion specifiers. */
+ { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W" },
+ { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "W" },
+ { NULL, 0, 0, NOLENGTHS, NULL, NULL }
+};
+
+static const format_char_info time_char_table[] =
+{
+ /* C89 conversion specifiers. */
+ { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "" },
+ { "cx", 0, STD_C89, NOLENGTHS, "E", "3" },
+ { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "" },
+ { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o" },
+ { "p", 0, STD_C89, NOLENGTHS, "#", "" },
+ { "X", 0, STD_C89, NOLENGTHS, "E", "" },
+ { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4" },
+ { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o" },
+ { "%", 0, STD_C89, NOLENGTHS, "", "" },
+ /* C99 conversion specifiers. */
+ { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o" },
+ { "D", 0, STD_C99, NOLENGTHS, "", "2" },
+ { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "" },
+ { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "" },
+ { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o" },
+ { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o" },
+ { "h", 0, STD_C99, NOLENGTHS, "^#", "" },
+ { "z", 0, STD_C99, NOLENGTHS, "O", "o" },
+ /* GNU conversion specifiers. */
+ { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "" },
+ { "P", 0, STD_EXT, NOLENGTHS, "", "" },
+ { NULL, 0, 0, NOLENGTHS, NULL, NULL }
+};
+
+static const format_char_info monetary_char_table[] =
+{
+ { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "" },
+ { NULL, 0, 0, NOLENGTHS, NULL, NULL }
+};
+
+
+/* This must be in the same order as enum format_type. */
+static const format_kind_info format_types[] =
+{
+ { "printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
+ printf_flag_specs, printf_flag_pairs,
+ FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK,
+ 'w', 0, 'p', 0, 'L',
+ &integer_type_node, &integer_type_node
+ },
+ { "scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
+ scanf_flag_specs, scanf_flag_pairs,
+ FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD,
+ 'w', 0, 0, '*', 'L',
+ NULL, NULL
+ },
+ { "strftime", NULL, time_char_table, "_-0^#", "EO",
+ strftime_flag_specs, strftime_flag_pairs,
+ FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0,
+ NULL, NULL
+ },
+ { "strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL,
+ strfmon_flag_specs, strfmon_flag_pairs,
+ FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L',
+ NULL, NULL
+ }
+};
+
+
+/* Structure detailing the results of checking a format function call
+ where the format expression may be a conditional expression with
+ many leaves resulting from nested conditional expressions. */
+typedef struct
+{
+ /* Number of leaves of the format argument that could not be checked
+ as they were not string literals. */
+ int number_non_literal;
+ /* Number of leaves of the format argument that were null pointers or
+ string literals, but had extra format arguments. */
+ int number_extra_args;
+ /* Number of leaves of the format argument that were null pointers or
+ string literals, but had extra format arguments and used $ operand
+ numbers. */
+ int number_dollar_extra_args;
+ /* Number of leaves of the format argument that were wide string
+ literals. */
+ int number_wide;
+ /* Number of leaves of the format argument that were empty strings. */
+ int number_empty;
+ /* Number of leaves of the format argument that were unterminated
+ strings. */
+ int number_unterminated;
+ /* Number of leaves of the format argument that were not counted above. */
+ int number_other;
+} format_check_results;
+
+static void check_format_info PARAMS ((int *, function_format_info *, tree));
+static void check_format_info_recurse PARAMS ((int *, format_check_results *,
+ function_format_info *, tree,
+ tree, int));
+static void check_format_info_main PARAMS ((int *, format_check_results *,
+ function_format_info *,
+ const char *, int, tree, int));
+static void status_warning PARAMS ((int *, const char *, ...))
+ ATTRIBUTE_PRINTF_2;
+
+static void init_dollar_format_checking PARAMS ((int, tree));
+static int maybe_read_dollar_number PARAMS ((int *, const char **, int,
+ tree, tree *,
+ const format_kind_info *));
+static void finish_dollar_format_checking PARAMS ((int *, format_check_results *));
+
+static const format_flag_spec *get_flag_spec PARAMS ((const format_flag_spec *,
+ int, const char *));
+
+static void check_format_types PARAMS ((int *, format_wanted_type *));
+
+/* Decode a format type from a string, returning the type, or
+ format_type_error if not valid, in which case the caller should print an
+ error message. */
+static enum format_type
+decode_format_type (s)
+ const char *s;
+{
+ int i;
+ int slen;
+ slen = strlen (s);
+ for (i = 0; i < (int) format_type_error; i++)
+ {
+ int alen;
+ if (!strcmp (s, format_types[i].name))
+ break;
+ alen = strlen (format_types[i].name);
+ if (slen == alen + 4 && s[0] == '_' && s[1] == '_'
+ && s[slen - 1] == '_' && s[slen - 2] == '_'
+ && !strncmp (s + 2, format_types[i].name, alen))
+ break;
+ }
+ return ((enum format_type) i);
+}
+
+\f
+/* Check the argument list of a call to printf, scanf, etc.
+ NAME is the function identifier.
+ ASSEMBLER_NAME is the function's assembler identifier.
+ (Either NAME or ASSEMBLER_NAME, but not both, may be NULL_TREE.)
+ PARAMS is the list of argument values. Also, if -Wmissing-format-attribute,
+ warn for calls to vprintf or vscanf in functions with no such format
+ attribute themselves. */
+
+void
+check_function_format (status, name, assembler_name, params)
+ int *status;
+ tree name;
+ tree assembler_name;
+ tree params;
+{
+ function_format_info *info;
+
+ /* See if this function is a format function. */
+ for (info = function_format_list; info; info = info->next)
+ {
+ if (info->assembler_name
+ ? (info->assembler_name == assembler_name)
+ : (info->name == name))
+ {
+ /* Yup; check it. */
+ check_format_info (status, info, params);
+ if (warn_missing_format_attribute && info->first_arg_num == 0
+ && (format_types[info->format_type].flags & FMT_FLAG_ARG_CONVERT))
+ {
+ function_format_info *info2;
+ for (info2 = function_format_list; info2; info2 = info2->next)
+ if ((info2->assembler_name
+ ? (info2->assembler_name == DECL_ASSEMBLER_NAME (current_function_decl))
+ : (info2->name == DECL_NAME (current_function_decl)))
+ && info2->format_type == info->format_type)
+ break;
+ if (info2 == NULL)
+ {
+ /* Check if the current function has a parameter to which
+ the format attribute could be attached; if not, it
+ can't be a candidate for a format attribute, despite
+ the vprintf-like or vscanf-like call. */
+ tree args;
+ for (args = DECL_ARGUMENTS (current_function_decl);
+ args != 0;
+ args = TREE_CHAIN (args))
+ {
+ if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
+ && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
+ == char_type_node))
+ break;
+ }
+ if (args != 0)
+ warning ("function might be possible candidate for `%s' format attribute",
+ format_types[info->format_type].name);
+ }
+ }
+ break;
+ }
+ }
+}
+
+/* This function replaces `warning' inside the printf format checking
+ functions. If the `status' parameter is non-NULL, then it is
+ dereferenced and set to 1 whenever a warning is caught. Otherwise
+ it warns as usual by replicating the innards of the warning
+ function from diagnostic.c. */
+static void
+status_warning VPARAMS ((int *status, const char *msgid, ...))
+{
+#ifndef ANSI_PROTOTYPES
+ int *status;
+ const char *msgid;
+#endif
+ va_list ap;
+ diagnostic_context dc;
+
+ VA_START (ap, msgid);
+
+#ifndef ANSI_PROTOTYPES
+ status = va_arg (ap, int *);
+ msgid = va_arg (ap, const char *);
+#endif
+
+ if (status)
+ *status = 1;
+ else
+ {
+ /* This duplicates the warning function behavior. */
+ set_diagnostic_context
+ (&dc, msgid, &ap, input_filename, lineno, /* warn = */ 1);
+ report_diagnostic (&dc);
+ }
+
+ va_end (ap);
+}
+
+/* Variables used by the checking of $ operand number formats. */
+static char *dollar_arguments_used = NULL;
+static int dollar_arguments_alloc = 0;
+static int dollar_arguments_count;
+static int dollar_first_arg_num;
+static int dollar_max_arg_used;
+static int dollar_format_warned;
+
+/* Initialize the checking for a format string that may contain $
+ parameter number specifications; we will need to keep track of whether
+ each parameter has been used. FIRST_ARG_NUM is the number of the first
+ argument that is a parameter to the format, or 0 for a vprintf-style
+ function; PARAMS is the list of arguments starting at this argument. */
+
+static void
+init_dollar_format_checking (first_arg_num, params)
+ int first_arg_num;
+ tree params;
+{
+ dollar_first_arg_num = first_arg_num;
+ dollar_arguments_count = 0;
+ dollar_max_arg_used = 0;
+ dollar_format_warned = 0;
+ if (first_arg_num > 0)
+ {
+ while (params)
+ {
+ dollar_arguments_count++;
+ params = TREE_CHAIN (params);
+ }
+ }
+ if (dollar_arguments_alloc < dollar_arguments_count)
+ {
+ if (dollar_arguments_used)
+ free (dollar_arguments_used);
+ dollar_arguments_alloc = dollar_arguments_count;
+ dollar_arguments_used = xmalloc (dollar_arguments_alloc);
+ }
+ if (dollar_arguments_alloc)
+ memset (dollar_arguments_used, 0, dollar_arguments_alloc);
+}
+
+
+/* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
+ is set, it is an error if one is not found; otherwise, it is OK. If
+ such a number is found, check whether it is within range and mark that
+ numbered operand as being used for later checking. Returns the operand
+ number if found and within range, zero if no such number was found and
+ this is OK, or -1 on error. PARAMS points to the first operand of the
+ format; PARAM_PTR is made to point to the parameter referred to. If
+ a $ format is found, *FORMAT is updated to point just after it. */
+
+static int
+maybe_read_dollar_number (status, format, dollar_needed, params, param_ptr,
+ fki)
+ int *status;
+ const char **format;
+ int dollar_needed;
+ tree params;
+ tree *param_ptr;
+ const format_kind_info *fki;
+{
+ int argnum;
+ int overflow_flag;
+ const char *fcp = *format;
+ if (*fcp < '0' || *fcp > '9')
+ {
+ if (dollar_needed)
+ {
+ status_warning (status, "missing $ operand number in format");
+ return -1;
+ }
+ else
+ return 0;
+ }
+ argnum = 0;
+ overflow_flag = 0;
+ while (*fcp >= '0' && *fcp <= '9')
+ {
+ int nargnum;
+ nargnum = 10 * argnum + (*fcp - '0');
+ if (nargnum < 0 || nargnum / 10 != argnum)
+ overflow_flag = 1;
+ argnum = nargnum;
+ fcp++;
+ }
+ if (*fcp != '$')
+ {
+ if (dollar_needed)
+ {
+ status_warning (status, "missing $ operand number in format");
+ return -1;
+ }
+ else
+ return 0;
+ }
+ *format = fcp + 1;
+ if (pedantic && !dollar_format_warned)
+ {
+ status_warning (status,
+ "%s does not support %%n$ operand number formats",
+ C_STD_NAME (STD_EXT));
+ dollar_format_warned = 1;
+ }
+ if (overflow_flag || argnum == 0
+ || (dollar_first_arg_num && argnum > dollar_arguments_count))
+ {
+ status_warning (status, "operand number out of range in format");
+ return -1;
+ }
+ if (argnum > dollar_max_arg_used)
+ dollar_max_arg_used = argnum;
+ /* For vprintf-style functions we may need to allocate more memory to
+ track which arguments are used. */
+ while (dollar_arguments_alloc < dollar_max_arg_used)
+ {
+ int nalloc;
+ nalloc = 2 * dollar_arguments_alloc + 16;
+ dollar_arguments_used = xrealloc (dollar_arguments_used, nalloc);
+ memset (dollar_arguments_used + dollar_arguments_alloc, 0,
+ nalloc - dollar_arguments_alloc);
+ dollar_arguments_alloc = nalloc;
+ }
+ if (!(fki->flags & FMT_FLAG_DOLLAR_MULTIPLE)
+ && dollar_arguments_used[argnum - 1] == 1)
+ {
+ dollar_arguments_used[argnum - 1] = 2;
+ status_warning (status,
+ "format argument %d used more than once in %s format",
+ argnum, fki->name);
+ }
+ else
+ dollar_arguments_used[argnum - 1] = 1;
+ if (dollar_first_arg_num)
+ {
+ int i;
+ *param_ptr = params;
+ for (i = 1; i < argnum && *param_ptr != 0; i++)
+ *param_ptr = TREE_CHAIN (*param_ptr);
+
+ if (*param_ptr == 0)
+ {
+ /* This case shouldn't be caught here. */
+ abort ();
+ }
+ }
+ else
+ *param_ptr = 0;
+ return argnum;
+}
+
+
+/* Finish the checking for a format string that used $ operand number formats
+ instead of non-$ formats. We check for unused operands before used ones
+ (a serious error, since the implementation of the format function
+ can't know what types to pass to va_arg to find the later arguments).
+ and for unused operands at the end of the format (if we know how many
+ arguments the format had, so not for vprintf). If there were operand
+ numbers out of range on a non-vprintf-style format, we won't have reached
+ here. */
+
+static void
+finish_dollar_format_checking (status, res)
+ int *status;
+ format_check_results *res;
+{
+ int i;
+ for (i = 0; i < dollar_max_arg_used; i++)
+ {
+ if (!dollar_arguments_used[i])
+ status_warning (status, "format argument %d unused before used argument %d in $-style format",
+ i + 1, dollar_max_arg_used);
+ }
+ if (dollar_first_arg_num && dollar_max_arg_used < dollar_arguments_count)
+ {
+ res->number_other--;
+ res->number_dollar_extra_args++;
+ }
+}
+
+
+/* Retrieve the specification for a format flag. SPEC contains the
+ specifications for format flags for the applicable kind of format.
+ FLAG is the flag in question. If PREDICATES is NULL, the basic
+ spec for that flag must be retrieved and this function aborts if
+ it cannot be found. If PREDICATES is not NULL, it is a string listing
+ possible predicates for the spec entry; if an entry predicated on any
+ of these is found, it is returned, otherwise NULL is returned. */
+
+static const format_flag_spec *
+get_flag_spec (spec, flag, predicates)
+ const format_flag_spec *spec;
+ int flag;
+ const char *predicates;
+{
+ int i;
+ for (i = 0; spec[i].flag_char != 0; i++)
+ {
+ if (spec[i].flag_char != flag)
+ continue;
+ if (predicates != NULL)
+ {
+ if (spec[i].predicate != 0
+ && strchr (predicates, spec[i].predicate) != 0)
+ return &spec[i];
+ }
+ else if (spec[i].predicate == 0)
+ return &spec[i];
+ }
+ if (predicates == NULL)
+ abort ();
+ else
+ return NULL;
+}
+
+
+/* Check the argument list of a call to printf, scanf, etc.
+ INFO points to the function_format_info structure.
+ PARAMS is the list of argument values. */
+
+static void
+check_format_info (status, info, params)
+ int *status;
+ function_format_info *info;
+ tree params;
+{
+ int arg_num;
+ tree format_tree;
+ format_check_results res;
+ /* Skip to format argument. If the argument isn't available, there's
+ no work for us to do; prototype checking will catch the problem. */
+ for (arg_num = 1; ; ++arg_num)
+ {
+ if (params == 0)
+ return;
+ if (arg_num == info->format_num)
+ break;
+ params = TREE_CHAIN (params);
+ }
+ format_tree = TREE_VALUE (params);
+ params = TREE_CHAIN (params);
+ if (format_tree == 0)
+ return;
+
+ res.number_non_literal = 0;
+ res.number_extra_args = 0;
+ res.number_dollar_extra_args = 0;
+ res.number_wide = 0;
+ res.number_empty = 0;
+ res.number_unterminated = 0;
+ res.number_other = 0;
+
+ check_format_info_recurse (status, &res, info, format_tree, params, arg_num);
+
+ if (res.number_non_literal > 0)
+ {
+ /* Functions taking a va_list normally pass a non-literal format
+ string. These functions typically are declared with
+ first_arg_num == 0, so avoid warning in those cases. */
+ if (!(format_types[info->format_type].flags & FMT_FLAG_ARG_CONVERT))
+ {
+ /* For strftime-like formats, warn for not checking the format
+ string; but there are no arguments to check. */
+ if (warn_format_nonliteral)
+ status_warning (status, "format not a string literal, format string not checked");
+ }
+ else if (info->first_arg_num != 0)
+ {
+ /* If there are no arguments for the format at all, we may have
+ printf (foo) which is likely to be a security hole. */
+ while (arg_num + 1 < info->first_arg_num)
+ {
+ if (params == 0)
+ break;
+ params = TREE_CHAIN (params);
+ ++arg_num;
+ }
+ if (params == 0 && (warn_format_nonliteral || warn_format_security))
+ status_warning (status, "format not a string literal and no format arguments");
+ else if (warn_format_nonliteral)
+ status_warning (status, "format not a string literal, argument types not checked");
+ }
+ }
+
+ /* If there were extra arguments to the format, normally warn. However,
+ the standard does say extra arguments are ignored, so in the specific
+ case where we have multiple leaves (conditional expressions or
+ ngettext) allow extra arguments if at least one leaf didn't have extra
+ arguments, but was otherwise OK (either non-literal or checked OK).
+ If the format is an empty string, this should be counted similarly to the
+ case of extra format arguments. */
+ if (res.number_extra_args > 0 && res.number_non_literal == 0
+ && res.number_other == 0 && warn_format_extra_args)
+ status_warning (status, "too many arguments for format");
+ if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
+ && res.number_other == 0 && warn_format_extra_args)
+ status_warning (status, "unused arguments in $-style format");
+ if (res.number_empty > 0 && res.number_non_literal == 0
+ && res.number_other == 0)
+ status_warning (status, "zero-length format string");
+
+ if (res.number_wide > 0)
+ status_warning (status, "format is a wide character string");
+
+ if (res.number_unterminated > 0)
+ status_warning (status, "unterminated format string");
+}
+
+
+/* Recursively check a call to a format function. FORMAT_TREE is the
+ format parameter, which may be a conditional expression in which
+ both halves should be checked. ARG_NUM is the number of the
+ format argument; PARAMS points just after it in the argument list. */
+
+static void
+check_format_info_recurse (status, res, info, format_tree, params, arg_num)
+ int *status;
+ format_check_results *res;
+ function_format_info *info;
+ tree format_tree;
+ tree params;
+ int arg_num;
+{
+ int format_length;
+ const char *format_chars;
+ tree array_size = 0;
+ tree array_init;
+
+ if (TREE_CODE (format_tree) == NOP_EXPR)
+ {
+ /* Strip coercion. */
+ check_format_info_recurse (status, res, info,
+ TREE_OPERAND (format_tree, 0), params,
+ arg_num);
+ return;
+ }
+
+ if (TREE_CODE (format_tree) == CALL_EXPR
+ && TREE_CODE (TREE_OPERAND (format_tree, 0)) == ADDR_EXPR
+ && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0))
+ == FUNCTION_DECL))
+ {
+ tree function = TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0);
+
+ /* See if this is a call to a known internationalization function
+ that modifies the format arg. */
+ international_format_info *iinfo;
+
+ for (iinfo = international_format_list; iinfo; iinfo = iinfo->next)
+ if (iinfo->assembler_name
+ ? (iinfo->assembler_name == DECL_ASSEMBLER_NAME (function))
+ : (iinfo->name == DECL_NAME (function)))
+ {
+ tree inner_args;
+ int i;
+
+ for (inner_args = TREE_OPERAND (format_tree, 1), i = 1;
+ inner_args != 0;
+ inner_args = TREE_CHAIN (inner_args), i++)
+ if (i == iinfo->format_num)
+ {
+ /* FIXME: with Marc Espie's __attribute__((nonnull))
+ patch in GCC, we will have chained attributes,
+ and be able to handle functions like ngettext
+ with multiple format_arg attributes properly. */
+ check_format_info_recurse (status, res, info,
+ TREE_VALUE (inner_args), params,
+ arg_num);
+ return;
+ }
+ }
+ }
+
+ if (TREE_CODE (format_tree) == COND_EXPR)
+ {
+ /* Check both halves of the conditional expression. */
+ check_format_info_recurse (status, res, info,
+ TREE_OPERAND (format_tree, 1), params,
+ arg_num);
+ check_format_info_recurse (status, res, info,
+ TREE_OPERAND (format_tree, 2), params,
+ arg_num);
+ return;
+ }
+
+ if (integer_zerop (format_tree))
+ {
+ /* FIXME: this warning should go away once Marc Espie's
+ __attribute__((nonnull)) patch is in. Instead, checking for
+ nonnull attributes should probably change this function to act
+ specially if info == NULL and add a res->number_null entry for
+ that case, or maybe add a function pointer to be called at
+ the end instead of hardcoding check_format_info_main. */
+ status_warning (status, "null format string");
+
+ /* Skip to first argument to check, so we can see if this format
+ has any arguments (it shouldn't). */
+ while (arg_num + 1 < info->first_arg_num)
+ {
+ if (params == 0)
+ return;
+ params = TREE_CHAIN (params);
+ ++arg_num;
+ }
+
+ if (params == 0)
+ res->number_other++;
+ else
+ res->number_extra_args++;
+
+ return;
+ }
+
+ if (TREE_CODE (format_tree) != ADDR_EXPR)
+ {
+ res->number_non_literal++;
+ return;
+ }
+ format_tree = TREE_OPERAND (format_tree, 0);
+ if (TREE_CODE (format_tree) == VAR_DECL
+ && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE
+ && (array_init = decl_constant_value (format_tree)) != format_tree
+ && TREE_CODE (array_init) == STRING_CST)
+ {
+ /* Extract the string constant initializer. Note that this may include
+ a trailing NUL character that is not in the array (e.g.
+ const char a[3] = "foo";). */
+ array_size = DECL_SIZE_UNIT (format_tree);
+ format_tree = array_init;
+ }
+ if (TREE_CODE (format_tree) != STRING_CST)
+ {
+ res->number_non_literal++;
+ return;
+ }
+ if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
+ {
+ res->number_wide++;
+ return;
+ }
+ format_chars = TREE_STRING_POINTER (format_tree);
+ format_length = TREE_STRING_LENGTH (format_tree);
+ if (array_size != 0)
+ {
+ /* Variable length arrays can't be initialized. */
+ if (TREE_CODE (array_size) != INTEGER_CST)
+ abort ();
+ if (host_integerp (array_size, 0))
+ {
+ HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size);
+ if (array_size_value > 0
+ && array_size_value == (int) array_size_value
+ && format_length > array_size_value)
+ format_length = array_size_value;
+ }
+ }
+ if (format_length < 1)
+ {
+ res->number_unterminated++;
+ return;
+ }
+ if (format_length == 1)
+ {
+ res->number_empty++;
+ return;
+ }
+ if (format_chars[--format_length] != 0)
+ {
+ res->number_unterminated++;
+ return;
+ }
+
+ /* Skip to first argument to check. */
+ while (arg_num + 1 < info->first_arg_num)
+ {
+ if (params == 0)
+ return;
+ params = TREE_CHAIN (params);
+ ++arg_num;
+ }
+ /* Provisionally increment res->number_other; check_format_info_main
+ will decrement it if it finds there are extra arguments, but this way
+ need not adjust it for every return. */
+ res->number_other++;
+ check_format_info_main (status, res, info, format_chars, format_length,
+ params, arg_num);
+}
+
+
+/* Do the main part of checking a call to a format function. FORMAT_CHARS
+ is the NUL-terminated format string (which at this point may contain
+ internal NUL characters); FORMAT_LENGTH is its length (excluding the
+ terminating NUL character). ARG_NUM is one less than the number of
+ the first format argument to check; PARAMS points to that format
+ argument in the list of arguments. */
+
+static void
+check_format_info_main (status, res, info, format_chars, format_length,
+ params, arg_num)
+ int *status;
+ format_check_results *res;
+ function_format_info *info;
+ const char *format_chars;
+ int format_length;
+ tree params;
+ int arg_num;
+{
+ const char *orig_format_chars = format_chars;
+ tree first_fillin_param = params;
+
+ const format_kind_info *fki = &format_types[info->format_type];
+ const format_flag_spec *flag_specs = fki->flag_specs;
+ const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs;
+
+ /* -1 if no conversions taking an operand have been found; 0 if one has
+ and it didn't use $; 1 if $ formats are in use. */
+ int has_operand_number = -1;
+
+ init_dollar_format_checking (info->first_arg_num, first_fillin_param);
+
+ while (1)
+ {
+ int i;
+ int suppressed = FALSE;
+ const char *length_chars = NULL;
+ enum format_lengths length_chars_val = FMT_LEN_none;
+ enum format_std_version length_chars_std = STD_C89;
+ int format_char;
+ tree cur_param;
+ tree wanted_type;
+ int main_arg_num = 0;
+ tree main_arg_params = 0;
+ enum format_std_version wanted_type_std;
+ const char *wanted_type_name;
+ format_wanted_type width_wanted_type;
+ format_wanted_type precision_wanted_type;
+ format_wanted_type main_wanted_type;
+ format_wanted_type *first_wanted_type = NULL;
+ format_wanted_type *last_wanted_type = NULL;
+ const format_length_info *fli = NULL;
+ const format_char_info *fci = NULL;
+ char flag_chars[256];
+ int aflag = 0;
+ if (*format_chars == 0)
+ {
+ if (format_chars - orig_format_chars != format_length)
+ status_warning (status, "embedded `\\0' in format");
+ if (info->first_arg_num != 0 && params != 0
+ && has_operand_number <= 0)
+ {
+ res->number_other--;
+ res->number_extra_args++;
+ }
+ if (has_operand_number > 0)
+ finish_dollar_format_checking (status, res);
+ return;
+ }
+ if (*format_chars++ != '%')
+ continue;
+ if (*format_chars == 0)
+ {
+ status_warning (status, "spurious trailing `%%' in format");
+ continue;
+ }
+ if (*format_chars == '%')
+ {
+ ++format_chars;
+ continue;
+ }
+ flag_chars[0] = 0;
+
+ if ((fki->flags & FMT_FLAG_USE_DOLLAR) && has_operand_number != 0)
+ {
+ /* Possibly read a $ operand number at the start of the format.
+ If one was previously used, one is required here. If one
+ is not used here, we can't immediately conclude this is a
+ format without them, since it could be printf %m or scanf %*. */
+ int opnum;
+ opnum = maybe_read_dollar_number (status, &format_chars, 0,
+ first_fillin_param,
+ &main_arg_params, fki);
+ if (opnum == -1)
+ return;
+ else if (opnum > 0)
+ {
+ has_operand_number = 1;
+ main_arg_num = opnum + info->first_arg_num - 1;
+ }
+ }
+
+ /* Read any format flags, but do not yet validate them beyond removing
+ duplicates, since in general validation depends on the rest of
+ the format. */
+ while (*format_chars != 0
+ && strchr (fki->flag_chars, *format_chars) != 0)
+ {
+ const format_flag_spec *s = get_flag_spec (flag_specs,
+ *format_chars, NULL);
+ if (strchr (flag_chars, *format_chars) != 0)
+ {
+ status_warning (status, "repeated %s in format", _(s->name));
+ }
+ else
+ {
+ i = strlen (flag_chars);
+ flag_chars[i++] = *format_chars;
+ flag_chars[i] = 0;
+ }
+ if (s->skip_next_char)
+ {
+ ++format_chars;
+ if (*format_chars == 0)
+ {
+ status_warning (status, "missing fill character at end of strfmon format");
+ return;
+ }
+ }
+ ++format_chars;
+ }
+
+ /* Read any format width, possibly * or *m$. */
+ if (fki->width_char != 0)
+ {
+ if (fki->width_type != NULL && *format_chars == '*')
+ {
+ i = strlen (flag_chars);
+ flag_chars[i++] = fki->width_char;
+ flag_chars[i] = 0;
+ /* "...a field width...may be indicated by an asterisk.
+ In this case, an int argument supplies the field width..." */
+ ++format_chars;
+ if (params == 0)
+ {
+ status_warning (status, "too few arguments for format");
+ return;
+ }
+ if (has_operand_number != 0)
+ {
+ int opnum;
+ opnum = maybe_read_dollar_number (status, &format_chars,
+ has_operand_number == 1,
+ first_fillin_param,
+ ¶ms, fki);
+ if (opnum == -1)
+ return;
+ else if (opnum > 0)
+ {
+ has_operand_number = 1;
+ arg_num = opnum + info->first_arg_num - 1;
+ }
+ else
+ has_operand_number = 0;
+ }
+ if (info->first_arg_num != 0)
+ {
+ cur_param = TREE_VALUE (params);
+ if (has_operand_number <= 0)
+ {
+ params = TREE_CHAIN (params);
+ ++arg_num;
+ }
+ width_wanted_type.wanted_type = *fki->width_type;
+ width_wanted_type.wanted_type_name = NULL;
+ width_wanted_type.pointer_count = 0;
+ width_wanted_type.char_lenient_flag = 0;
+ width_wanted_type.writing_in_flag = 0;
+ width_wanted_type.reading_from_flag = 0;
+ width_wanted_type.name = _("field width");
+ width_wanted_type.param = cur_param;
+ width_wanted_type.arg_num = arg_num;
+ width_wanted_type.next = NULL;
+ if (last_wanted_type != 0)
+ last_wanted_type->next = &width_wanted_type;
+ if (first_wanted_type == 0)
+ first_wanted_type = &width_wanted_type;
+ last_wanted_type = &width_wanted_type;
+ }
+ }
+ else
+ {
+ /* Possibly read a numeric width. If the width is zero,
+ we complain if appropriate. */
+ int non_zero_width_char = FALSE;
+ int found_width = FALSE;
+ while (ISDIGIT (*format_chars))
+ {
+ found_width = TRUE;
+ if (*format_chars != '0')
+ non_zero_width_char = TRUE;
+ ++format_chars;
+ }
+ if (found_width && !non_zero_width_char &&
+ (fki->flags & FMT_FLAG_ZERO_WIDTH_BAD))
+ status_warning (status, "zero width in %s format",
+ fki->name);
+ if (found_width)
+ {
+ i = strlen (flag_chars);
+ flag_chars[i++] = fki->width_char;
+ flag_chars[i] = 0;
+ }
+ }
+ }
+
+ /* Read any format left precision (must be a number, not *). */
+ if (fki->left_precision_char != 0 && *format_chars == '#')
+ {
+ ++format_chars;
+ i = strlen (flag_chars);
+ flag_chars[i++] = fki->left_precision_char;
+ flag_chars[i] = 0;
+ if (!ISDIGIT (*format_chars))
+ status_warning (status, "empty left precision in %s format",
+ fki->name);
+ while (ISDIGIT (*format_chars))
+ ++format_chars;
+ }
+
+ /* Read any format precision, possibly * or *m$. */
+ if (fki->precision_char != 0 && *format_chars == '.')
+ {
+ ++format_chars;
+ i = strlen (flag_chars);
+ flag_chars[i++] = fki->precision_char;
+ flag_chars[i] = 0;
+ if (fki->precision_type != NULL && *format_chars == '*')
+ {
+ /* "...a...precision...may be indicated by an asterisk.
+ In this case, an int argument supplies the...precision." */
+ ++format_chars;
+ if (has_operand_number != 0)
+ {
+ int opnum;
+ opnum = maybe_read_dollar_number (status, &format_chars,
+ has_operand_number == 1,
+ first_fillin_param,
+ ¶ms, fki);
+ if (opnum == -1)
+ return;
+ else if (opnum > 0)
+ {
+ has_operand_number = 1;
+ arg_num = opnum + info->first_arg_num - 1;
+ }
+ else
+ has_operand_number = 0;
+ }
+ if (info->first_arg_num != 0)
+ {
+ if (params == 0)
+ {
+ status_warning (status, "too few arguments for format");
+ return;
+ }
+ cur_param = TREE_VALUE (params);
+ if (has_operand_number <= 0)
+ {
+ params = TREE_CHAIN (params);
+ ++arg_num;
+ }
+ precision_wanted_type.wanted_type = *fki->precision_type;
+ precision_wanted_type.wanted_type_name = NULL;
+ precision_wanted_type.pointer_count = 0;
+ precision_wanted_type.char_lenient_flag = 0;
+ precision_wanted_type.writing_in_flag = 0;
+ precision_wanted_type.reading_from_flag = 0;
+ precision_wanted_type.name = _("field precision");
+ precision_wanted_type.param = cur_param;
+ precision_wanted_type.arg_num = arg_num;
+ precision_wanted_type.next = NULL;
+ if (last_wanted_type != 0)
+ last_wanted_type->next = &precision_wanted_type;
+ if (first_wanted_type == 0)
+ first_wanted_type = &precision_wanted_type;
+ last_wanted_type = &precision_wanted_type;
+ }
+ }
+ else
+ {
+ if (!(fki->flags & FMT_FLAG_EMPTY_PREC_OK)
+ && !ISDIGIT (*format_chars))
+ status_warning (status, "empty precision in %s format",
+ fki->name);
+ while (ISDIGIT (*format_chars))
+ ++format_chars;
+ }
+ }
+
+ /* Read any length modifier, if this kind of format has them. */
+ fli = fki->length_char_specs;
+ length_chars = NULL;
+ length_chars_val = FMT_LEN_none;
+ length_chars_std = STD_C89;
+ if (fli)
+ {
+ while (fli->name != 0 && fli->name[0] != *format_chars)
+ fli++;
+ if (fli->name != 0)
+ {
+ format_chars++;
+ if (fli->double_name != 0 && fli->name[0] == *format_chars)
+ {
+ format_chars++;
+ length_chars = fli->double_name;
+ length_chars_val = fli->double_index;
+ length_chars_std = fli->double_std;
+ }
+ else
+ {
+ length_chars = fli->name;
+ length_chars_val = fli->index;
+ length_chars_std = fli->std;
+ }
+ i = strlen (flag_chars);
+ flag_chars[i++] = fki->length_code_char;
+ flag_chars[i] = 0;
+ }
+ if (pedantic)
+ {
+ /* Warn if the length modifier is non-standard. */
+ if (ADJ_STD (length_chars_std) > C_STD_VER)
+ status_warning (status, "%s does not support the `%s' %s length modifier",
+ C_STD_NAME (length_chars_std), length_chars,
+ fki->name);
+ }
+ }
+
+ /* Read any modifier (strftime E/O). */
+ if (fki->modifier_chars != NULL)
+ {
+ while (*format_chars != 0
+ && strchr (fki->modifier_chars, *format_chars) != 0)
+ {
+ if (strchr (flag_chars, *format_chars) != 0)
+ {
+ const format_flag_spec *s = get_flag_spec (flag_specs,
+ *format_chars, NULL);
+ status_warning (status, "repeated %s in format", _(s->name));
+ }
+ else
+ {
+ i = strlen (flag_chars);
+ flag_chars[i++] = *format_chars;
+ flag_chars[i] = 0;
+ }
+ ++format_chars;
+ }
+ }
+
+ /* Handle the scanf allocation kludge. */
+ if (fki->flags & FMT_FLAG_SCANF_A_KLUDGE)
+ {
+ if (*format_chars == 'a' && !flag_isoc99)
+ {
+ if (format_chars[1] == 's' || format_chars[1] == 'S'
+ || format_chars[1] == '[')
+ {
+ /* `a' is used as a flag. */
+ i = strlen (flag_chars);
+ flag_chars[i++] = 'a';
+ flag_chars[i] = 0;
+ format_chars++;
+ }
+ }
+ }
+
+ format_char = *format_chars;
+ if (format_char == 0
+ || (!(fki->flags & FMT_FLAG_FANCY_PERCENT_OK) && format_char == '%'))
+ {
+ status_warning (status, "conversion lacks type at end of format");
+ continue;
+ }
+ format_chars++;
+ fci = fki->conversion_specs;
+ while (fci->format_chars != 0
+ && strchr (fci->format_chars, format_char) == 0)
+ ++fci;
+ if (fci->format_chars == 0)
+ {
+ if (ISGRAPH(format_char))
+ status_warning (status, "unknown conversion type character `%c' in format",
+ format_char);
+ else
+ status_warning (status, "unknown conversion type character 0x%x in format",
+ format_char);
+ continue;
+ }
+ if (pedantic)
+ {
+ if (ADJ_STD (fci->std) > C_STD_VER)
+ status_warning (status, "%s does not support the `%%%c' %s format",
+ C_STD_NAME (fci->std), format_char, fki->name);
+ }
+
+ /* Validate the individual flags used, removing any that are invalid. */
+ {
+ int d = 0;
+ for (i = 0; flag_chars[i] != 0; i++)
+ {
+ const format_flag_spec *s = get_flag_spec (flag_specs,
+ flag_chars[i], NULL);
+ flag_chars[i - d] = flag_chars[i];
+ if (flag_chars[i] == fki->length_code_char)
+ continue;
+ if (strchr (fci->flag_chars, flag_chars[i]) == 0)
+ {
+ status_warning (status, "%s used with `%%%c' %s format",
+ _(s->name), format_char, fki->name);
+ d++;
+ continue;
+ }
+ if (pedantic)
+ {
+ const format_flag_spec *t;
+ if (ADJ_STD (s->std) > C_STD_VER)
+ status_warning (status, "%s does not support %s",
+ C_STD_NAME (s->std), _(s->long_name));
+ t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
+ if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std))
+ {
+ const char *long_name = (t->long_name != NULL
+ ? t->long_name
+ : s->long_name);
+ if (ADJ_STD (t->std) > C_STD_VER)
+ status_warning (status, "%s does not support %s with the `%%%c' %s format",
+ C_STD_NAME (t->std), _(long_name),
+ format_char, fki->name);
+ }
+ }
+ }
+ flag_chars[i - d] = 0;
+ }
+
+ if ((fki->flags & FMT_FLAG_SCANF_A_KLUDGE)
+ && strchr (flag_chars, 'a') != 0)
+ aflag = 1;
+
+ if (fki->suppression_char
+ && strchr (flag_chars, fki->suppression_char) != 0)
+ suppressed = 1;
+
+ /* Validate the pairs of flags used. */
+ for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
+ {
+ const format_flag_spec *s, *t;
+ if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
+ continue;
+ if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
+ continue;
+ if (bad_flag_pairs[i].predicate != 0
+ && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
+ continue;
+ s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
+ t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
+ if (bad_flag_pairs[i].ignored)
+ {
+ if (bad_flag_pairs[i].predicate != 0)
+ status_warning (status, "%s ignored with %s and `%%%c' %s format",
+ _(s->name), _(t->name), format_char,
+ fki->name);
+ else
+ status_warning (status, "%s ignored with %s in %s format",
+ _(s->name), _(t->name), fki->name);
+ }
+ else
+ {
+ if (bad_flag_pairs[i].predicate != 0)
+ status_warning (status, "use of %s and %s together with `%%%c' %s format",
+ _(s->name), _(t->name), format_char,
+ fki->name);
+ else
+ status_warning (status, "use of %s and %s together in %s format",
+ _(s->name), _(t->name), fki->name);
+ }
+ }
+
+ /* Give Y2K warnings. */
+ if (warn_format_y2k)
+ {
+ int y2k_level = 0;
+ if (strchr (fci->flags2, '4') != 0)
+ if (strchr (flag_chars, 'E') != 0)
+ y2k_level = 3;
+ else
+ y2k_level = 2;
+ else if (strchr (fci->flags2, '3') != 0)
+ y2k_level = 3;
+ else if (strchr (fci->flags2, '2') != 0)
+ y2k_level = 2;
+ if (y2k_level == 3)
+ status_warning (status, "`%%%c' yields only last 2 digits of year in some locales",
+ format_char);
+ else if (y2k_level == 2)
+ status_warning (status, "`%%%c' yields only last 2 digits of year", format_char);
+ }
+
+ if (strchr (fci->flags2, '[') != 0)
+ {
+ /* Skip over scan set, in case it happens to have '%' in it. */
+ if (*format_chars == '^')
+ ++format_chars;
+ /* Find closing bracket; if one is hit immediately, then
+ it's part of the scan set rather than a terminator. */
+ if (*format_chars == ']')
+ ++format_chars;
+ while (*format_chars && *format_chars != ']')
+ ++format_chars;
+ if (*format_chars != ']')
+ /* The end of the format string was reached. */
+ status_warning (status, "no closing `]' for `%%[' format");
+ }
+
+ wanted_type = 0;
+ wanted_type_name = 0;
+ if (fki->flags & FMT_FLAG_ARG_CONVERT)
+ {
+ wanted_type = (fci->types[length_chars_val].type
+ ? *fci->types[length_chars_val].type : 0);
+ wanted_type_name = fci->types[length_chars_val].name;
+ wanted_type_std = fci->types[length_chars_val].std;
+ if (wanted_type == 0)
+ {
+ status_warning (status, "use of `%s' length modifier with `%c' type character",
+ length_chars, format_char);
+ /* Heuristic: skip one argument when an invalid length/type
+ combination is encountered. */
+ arg_num++;
+ if (params == 0)
+ {
+ status_warning (status, "too few arguments for format");
+ return;
+ }
+ params = TREE_CHAIN (params);
+ continue;
+ }
+ else if (pedantic
+ /* Warn if non-standard, provided it is more non-standard
+ than the length and type characters that may already
+ have been warned for. */
+ && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std)
+ && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std))
+ {
+ if (ADJ_STD (wanted_type_std) > C_STD_VER)
+ status_warning (status, "%s does not support the `%%%s%c' %s format",
+ C_STD_NAME (wanted_type_std), length_chars,
+ format_char, fki->name);
+ }
+ }
+
+ /* Finally. . .check type of argument against desired type! */
+ if (info->first_arg_num == 0)
+ continue;
+ if ((fci->pointer_count == 0 && wanted_type == void_type_node)
+ || suppressed)
+ {
+ if (main_arg_num != 0)
+ {
+ if (suppressed)
+ status_warning (status, "operand number specified with suppressed assignment");
+ else
+ status_warning (status, "operand number specified for format taking no argument");
+ }
+ }
+ else
+ {
+ if (main_arg_num != 0)
+ {
+ arg_num = main_arg_num;
+ params = main_arg_params;
+ }
+ else
+ {
+ ++arg_num;
+ if (has_operand_number > 0)
+ {
+ status_warning (status, "missing $ operand number in format");
+ return;
+ }
+ else
+ has_operand_number = 0;
+ if (params == 0)
+ {
+ status_warning (status, "too few arguments for format");
+ return;
+ }
+ }
+ cur_param = TREE_VALUE (params);
+ params = TREE_CHAIN (params);
+ main_wanted_type.wanted_type = wanted_type;
+ main_wanted_type.wanted_type_name = wanted_type_name;
+ main_wanted_type.pointer_count = fci->pointer_count + aflag;
+ main_wanted_type.char_lenient_flag = 0;
+ if (strchr (fci->flags2, 'c') != 0)
+ main_wanted_type.char_lenient_flag = 1;
+ main_wanted_type.writing_in_flag = 0;
+ main_wanted_type.reading_from_flag = 0;
+ if (aflag)
+ main_wanted_type.writing_in_flag = 1;
+ else
+ {
+ if (strchr (fci->flags2, 'W') != 0)
+ main_wanted_type.writing_in_flag = 1;
+ if (strchr (fci->flags2, 'R') != 0)
+ main_wanted_type.reading_from_flag = 1;
+ }
+ main_wanted_type.name = NULL;
+ main_wanted_type.param = cur_param;
+ main_wanted_type.arg_num = arg_num;
+ main_wanted_type.next = NULL;
+ if (last_wanted_type != 0)
+ last_wanted_type->next = &main_wanted_type;
+ if (first_wanted_type == 0)
+ first_wanted_type = &main_wanted_type;
+ last_wanted_type = &main_wanted_type;
+ }
+
+ if (first_wanted_type != 0)
+ check_format_types (status, first_wanted_type);
+
+ }
+}
+
+
+/* Check the argument types from a single format conversion (possibly
+ including width and precision arguments). */
+static void
+check_format_types (status, types)
+ int *status;
+ format_wanted_type *types;
+{
+ for (; types != 0; types = types->next)
+ {
+ tree cur_param;
+ tree cur_type;
+ tree orig_cur_type;
+ tree wanted_type;
+ tree promoted_type;
+ int arg_num;
+ int i;
+ int char_type_flag;
+ cur_param = types->param;
+ cur_type = TREE_TYPE (cur_param);
+ if (cur_type == error_mark_node)
+ continue;
+ char_type_flag = 0;
+ wanted_type = types->wanted_type;
+ arg_num = types->arg_num;
+
+ /* The following should not occur here. */
+ if (wanted_type == 0)
+ abort ();
+ if (wanted_type == void_type_node && types->pointer_count == 0)
+ abort ();
+
+ if (types->pointer_count == 0)
+ {
+ promoted_type = simple_type_promotes_to (wanted_type);
+ if (promoted_type != NULL_TREE)
+ wanted_type = promoted_type;
+ }
+
+ STRIP_NOPS (cur_param);
+
+ /* Check the types of any additional pointer arguments
+ that precede the "real" argument. */
+ for (i = 0; i < types->pointer_count; ++i)
+ {
+ if (TREE_CODE (cur_type) == POINTER_TYPE)
+ {
+ cur_type = TREE_TYPE (cur_type);
+ if (cur_type == error_mark_node)
+ break;
+
+ /* Check for writing through a NULL pointer. */
+ if (types->writing_in_flag
+ && i == 0
+ && cur_param != 0
+ && integer_zerop (cur_param))
+ status_warning (status,
+ "writing through null pointer (arg %d)",
+ arg_num);
+
+ /* Check for reading through a NULL pointer. */
+ if (types->reading_from_flag
+ && i == 0
+ && cur_param != 0
+ && integer_zerop (cur_param))
+ status_warning (status,
+ "reading through null pointer (arg %d)",
+ arg_num);
+
+ if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
+ cur_param = TREE_OPERAND (cur_param, 0);
+ else
+ cur_param = 0;
+
+ /* See if this is an attempt to write into a const type with
+ scanf or with printf "%n". Note: the writing in happens
+ at the first indirection only, if for example
+ void * const * is passed to scanf %p; passing
+ const void ** is simply passing an incompatible type. */
+ if (types->writing_in_flag
+ && i == 0
+ && (TYPE_READONLY (cur_type)
+ || (cur_param != 0
+ && (TREE_CODE_CLASS (TREE_CODE (cur_param)) == 'c'
+ || (DECL_P (cur_param)
+ && TREE_READONLY (cur_param))))))
+ status_warning (status, "writing into constant object (arg %d)", arg_num);
+
+ /* If there are extra type qualifiers beyond the first
+ indirection, then this makes the types technically
+ incompatible. */
+ if (i > 0
+ && pedantic
+ && (TYPE_READONLY (cur_type)
+ || TYPE_VOLATILE (cur_type)
+ || TYPE_RESTRICT (cur_type)))
+ status_warning (status, "extra type qualifiers in format argument (arg %d)",
+ arg_num);
+
+ }
+ else
+ {
+ if (types->pointer_count == 1)
+ status_warning (status, "format argument is not a pointer (arg %d)", arg_num);
+ else
+ status_warning (status, "format argument is not a pointer to a pointer (arg %d)", arg_num);
+ break;
+ }
+ }
+
+ if (i < types->pointer_count)
+ continue;
+
+ orig_cur_type = cur_type;
+ cur_type = TYPE_MAIN_VARIANT (cur_type);
+
+ /* Check whether the argument type is a character type. This leniency
+ only applies to certain formats, flagged with 'c'.
+ */
+ if (types->char_lenient_flag)
+ char_type_flag = (cur_type == char_type_node
+ || cur_type == signed_char_type_node
+ || cur_type == unsigned_char_type_node);
+
+ /* Check the type of the "real" argument, if there's a type we want. */
+ if (wanted_type == cur_type)
+ continue;
+ /* If we want `void *', allow any pointer type.
+ (Anything else would already have got a warning.)
+ With -pedantic, only allow pointers to void and to character
+ types. */
+ if (wanted_type == void_type_node
+ && (!pedantic || (i == 1 && char_type_flag)))
+ continue;
+ /* Don't warn about differences merely in signedness, unless
+ -pedantic. With -pedantic, warn if the type is a pointer
+ target and not a character type, and for character types at
+ a second level of indirection. */
+ if (TREE_CODE (wanted_type) == INTEGER_TYPE
+ && TREE_CODE (cur_type) == INTEGER_TYPE
+ && (! pedantic || i == 0 || (i == 1 && char_type_flag))
+ && (TREE_UNSIGNED (wanted_type)
+ ? wanted_type == unsigned_type (cur_type)
+ : wanted_type == signed_type (cur_type)))
+ continue;
+ /* Likewise, "signed char", "unsigned char" and "char" are
+ equivalent but the above test won't consider them equivalent. */
+ if (wanted_type == char_type_node
+ && (! pedantic || i < 2)
+ && char_type_flag)
+ continue;
+ /* Now we have a type mismatch. */
+ {
+ register const char *this;
+ register const char *that;
+
+ this = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (wanted_type)));
+ that = 0;
+ if (TYPE_NAME (orig_cur_type) != 0
+ && TREE_CODE (orig_cur_type) != INTEGER_TYPE
+ && !(TREE_CODE (orig_cur_type) == POINTER_TYPE
+ && TREE_CODE (TREE_TYPE (orig_cur_type)) == INTEGER_TYPE))
+ {
+ if (TREE_CODE (TYPE_NAME (orig_cur_type)) == TYPE_DECL
+ && DECL_NAME (TYPE_NAME (orig_cur_type)) != 0)
+ that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (orig_cur_type)));
+ else
+ that = IDENTIFIER_POINTER (TYPE_NAME (orig_cur_type));
+ }
+
+ /* A nameless type can't possibly match what the format wants.
+ So there will be a warning for it.
+ Make up a string to describe vaguely what it is. */
+ if (that == 0)
+ {
+ if (TREE_CODE (orig_cur_type) == POINTER_TYPE)
+ that = "pointer";
+ else
+ that = "different type";
+ }
+
+ /* Make the warning better in case of mismatch of int vs long. */
+ if (TREE_CODE (orig_cur_type) == INTEGER_TYPE
+ && TREE_CODE (wanted_type) == INTEGER_TYPE
+ && TYPE_PRECISION (orig_cur_type) == TYPE_PRECISION (wanted_type)
+ && TYPE_NAME (orig_cur_type) != 0
+ && TREE_CODE (TYPE_NAME (orig_cur_type)) == TYPE_DECL)
+ that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (orig_cur_type)));
+
+ if (strcmp (this, that) != 0)
+ {
+ /* There may be a better name for the format, e.g. size_t,
+ but we should allow for programs with a perverse typedef
+ making size_t something other than what the compiler
+ thinks. */
+ if (types->wanted_type_name != 0
+ && strcmp (types->wanted_type_name, that) != 0)
+ this = types->wanted_type_name;
+ if (types->name != 0)
+ status_warning (status, "%s is not type %s (arg %d)", types->name, this,
+ arg_num);
+ else
+ status_warning (status, "%s format, %s arg (arg %d)", this, that, arg_num);
+ }
+ }
+ }
+}
2001-01-13 Joseph S. Myers <jsm28@cam.ac.uk>
+ * Make-lang.in (CXX_C_OBJS): Add c-format.o.
+
+2001-01-13 Joseph S. Myers <jsm28@cam.ac.uk>
+
* g++.1: Change to be ".so man1/gcc.1".
2001-01-13 Joseph S. Myers <jsm28@cam.ac.uk>
# The compiler itself.
# Shared with C front end:
-CXX_C_OBJS = c-common.o c-pragma.o c-semantics.o c-lex.o c-dump.o $(CXX_TARGET_OBJS)
+CXX_C_OBJS = c-common.o c-format.o c-pragma.o c-semantics.o c-lex.o c-dump.o $(CXX_TARGET_OBJS)
# Language-specific object files.
CXX_OBJS = cp/call.o cp/decl.o cp/errfn.o cp/expr.o cp/pt.o cp/typeck2.o \
projects / platform / upstream / gcc.git / commitdiff