Include <ctype.h>; avoid home-grown ISDIGIT.
(decl_attributes): Call record_function_format with DECL_NAME and also DECL_ASSEMBLER_NAME. (struct format_char_info): Moved here from c-typeck.c. (print_char_table): Likewise; renamed from print_table. (scan_char_table): Likewise; renamed from scan_table. (struct function_format_info): Likewise; add assembler_name. (function_format_list): Make list, not array. (init_function_format_info): Likewise; renamed from init_format_info_table. (record_function_format): Likewise; renamed from record_format_info; record assembler_name. (check_format_info): Likewise; renamed from check_format. (check_function_format): New interface that does not require knowledge of struct function_format_info. From-SVN: r5607
This commit is contained in:
Richard Kenner
parent
561d994ff6
commit
1ccf251f97
572
gcc/c-common.c
572
gcc/c-common.c
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@ -24,6 +24,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "flags.h"
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#include "obstack.h"
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#include <stdio.h>
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#include <ctype.h>
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extern struct obstack permanent_obstack;
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@ -335,12 +336,577 @@ decl_attributes (decl, attributes)
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return;
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}
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}
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record_format_info (DECL_NAME (decl), is_scan, format_num,
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first_arg_num);
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record_function_format (DECL_NAME (decl), DECL_ASSEMBLER_NAME (decl),
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is_scan, format_num, first_arg_num);
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}
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}
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/* Check a printf/fprintf/sprintf/scanf/fscanf/sscanf format against
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a parameter list. */
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#define T_I &integer_type_node
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#define T_L &long_integer_type_node
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#define T_S &short_integer_type_node
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#define T_UI &unsigned_type_node
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#define T_UL &long_unsigned_type_node
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#define T_US &short_unsigned_type_node
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#define T_F &float_type_node
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#define T_D &double_type_node
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#define T_LD &long_double_type_node
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#define T_C &char_type_node
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#define T_V &void_type_node
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#define T_W &wchar_type_node
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typedef struct {
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char *format_chars;
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int pointer_count;
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/* Type of argument if no length modifier is used. */
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tree *nolen;
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/* Type of argument if length modifier for shortening is used.
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If NULL, then this modifier is not allowed. */
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tree *hlen;
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/* Type of argument if length modifier `l' is used.
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If NULL, then this modifier is not allowed. */
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tree *llen;
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/* Type of argument if length modifier `L' is used.
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If NULL, then this modifier is not allowed. */
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tree *bigllen;
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/* List of other modifier characters allowed with these options. */
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char *flag_chars;
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} format_char_info;
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static format_char_info print_char_table[] = {
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{ "di", 0, T_I, T_I, T_L, NULL, "-wp0 +" },
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{ "oxX", 0, T_UI, T_UI, T_UL, NULL, "-wp0#" },
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{ "u", 0, T_UI, T_UI, T_UL, NULL, "-wp0" },
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{ "feEgG", 0, T_D, NULL, NULL, T_LD, "-wp0 +#" },
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{ "c", 0, T_I, NULL, T_W, NULL, "-w" },
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{ "C", 0, T_W, NULL, NULL, NULL, "-w" },
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{ "s", 1, T_C, NULL, T_W, NULL, "-wp" },
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{ "S", 1, T_W, NULL, NULL, NULL, "-wp" },
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{ "p", 1, T_V, NULL, NULL, NULL, "-w" },
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{ "n", 1, T_I, T_S, T_L, NULL, "" },
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{ NULL }
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};
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static format_char_info scan_char_table[] = {
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{ "di", 1, T_I, T_S, T_L, NULL, "*" },
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{ "ouxX", 1, T_UI, T_US, T_UL, NULL, "*" },
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{ "efgEG", 1, T_F, NULL, T_D, T_LD, "*" },
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{ "sc", 1, T_C, NULL, T_W, NULL, "*" },
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{ "[", 1, T_C, NULL, NULL, NULL, "*" },
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{ "C", 1, T_W, NULL, NULL, NULL, "*" },
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{ "S", 1, T_W, NULL, NULL, NULL, "*" },
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{ "p", 2, T_V, NULL, NULL, NULL, "*" },
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{ "n", 1, T_I, T_S, T_L, NULL, "" },
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{ NULL }
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};
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typedef struct function_format_info {
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struct function_format_info *next; /* next structure on the list */
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tree name; /* identifier such as "printf" */
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tree assembler_name; /* optional mangled identifier (for C++) */
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int is_scan; /* TRUE if *scanf */
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int format_num; /* number of format argument */
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int first_arg_num; /* number of first arg (zero for varargs) */
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} function_format_info;
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static function_format_info *function_format_list = NULL;
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static void check_format_info PROTO((function_format_info *, tree));
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/* Initialize the table of functions to perform format checking on.
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The ANSI functions are always checked (whether <stdio.h> is
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included or not), since it is common to call printf without
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including <stdio.h>. There shouldn't be a problem with this,
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since ANSI reserves these function names whether you include the
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header file or not. In any case, the checking is harmless. */
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void
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init_function_format_info ()
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{
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record_function_format (get_identifier ("printf"), NULL_TREE, 0, 1, 2);
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record_function_format (get_identifier ("fprintf"), NULL_TREE, 0, 2, 3);
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record_function_format (get_identifier ("sprintf"), NULL_TREE, 0, 2, 3);
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record_function_format (get_identifier ("scanf"), NULL_TREE, 1, 1, 2);
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record_function_format (get_identifier ("fscanf"), NULL_TREE, 1, 2, 3);
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record_function_format (get_identifier ("sscanf"), NULL_TREE, 1, 2, 3);
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record_function_format (get_identifier ("vprintf"), NULL_TREE, 0, 1, 0);
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record_function_format (get_identifier ("vfprintf"), NULL_TREE, 0, 2, 0);
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record_function_format (get_identifier ("vsprintf"), NULL_TREE, 0, 2, 0);
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}
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/* Record information for argument format checking. FUNCTION_IDENT is
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the identifier node for the name of the function to check (its decl
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need not exist yet). IS_SCAN is true for scanf-type format checking;
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false indicates printf-style format checking. FORMAT_NUM is the number
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of the argument which is the format control string (starting from 1).
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FIRST_ARG_NUM is the number of the first actual argument to check
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against teh format string, or zero if no checking is not be done
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(e.g. for varargs such as vfprintf). */
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void
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record_function_format (name, assembler_name, is_scan,
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format_num, first_arg_num)
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tree name;
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tree assembler_name;
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int is_scan;
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int format_num;
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int first_arg_num;
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{
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function_format_info *info;
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/* Re-use existing structure if it's there. */
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for (info = function_format_list; info; info = info->next)
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{
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if (info->name == name && info->assembler_name == assembler_name)
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break;
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}
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if (! info)
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{
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info = (function_format_info *) xmalloc (sizeof (function_format_info));
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info->next = function_format_list;
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function_format_list = info;
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info->name = name;
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info->assembler_name = assembler_name;
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}
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info->is_scan = is_scan;
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info->format_num = format_num;
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info->first_arg_num = first_arg_num;
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}
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static char tfaff[] = "too few arguments for format";
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/* Check the argument list of a call to printf, scanf, etc.
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NAME is the function identifier.
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ASSEMBLER_NAME is the function's assembler identifier.
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(Either NAME or ASSEMBLER_NAME, but not both, may be NULL_TREE.)
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PARAMS is the list of argument values. */
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void
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check_function_format (name, assembler_name, params)
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tree name;
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tree assembler_name;
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tree params;
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{
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function_format_info *info;
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/* See if this function is a format function. */
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for (info = function_format_list; info; info = info->next)
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{
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if ((info->assembler_name || assembler_name)
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? (info->assembler_name == assembler_name)
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: (info->name == name))
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{
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/* Yup; check it. */
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check_format_info (info, params);
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break;
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}
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}
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}
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/* Check the argument list of a call to printf, scanf, etc.
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INFO points to the function_format_info structure.
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PARAMS is the list of argument values. */
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static void
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check_format_info (info, params)
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function_format_info *info;
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tree params;
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{
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int i;
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int arg_num;
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int suppressed, wide, precise;
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int length_char;
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int format_char;
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int format_length;
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tree format_tree;
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tree cur_param;
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tree cur_type;
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tree wanted_type;
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char *format_chars;
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format_char_info *fci;
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static char message[132];
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char flag_chars[8];
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/* Skip to format argument. If the argument isn't available, there's
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no work for us to do; prototype checking will catch the problem. */
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for (arg_num = 1; ; ++arg_num)
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{
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if (params == 0)
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return;
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if (arg_num == info->format_num)
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break;
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params = TREE_CHAIN (params);
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}
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format_tree = TREE_VALUE (params);
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params = TREE_CHAIN (params);
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if (format_tree == 0)
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return;
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/* We can only check the format if it's a string constant. */
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while (TREE_CODE (format_tree) == NOP_EXPR)
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format_tree = TREE_OPERAND (format_tree, 0); /* strip coercion */
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if (format_tree == null_pointer_node)
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{
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warning ("null format string");
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return;
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}
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if (TREE_CODE (format_tree) != ADDR_EXPR)
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return;
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format_tree = TREE_OPERAND (format_tree, 0);
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if (TREE_CODE (format_tree) != STRING_CST)
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return;
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format_chars = TREE_STRING_POINTER (format_tree);
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format_length = TREE_STRING_LENGTH (format_tree);
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if (format_length <= 1)
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warning ("zero-length format string");
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if (format_chars[--format_length] != 0)
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{
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warning ("unterminated format string");
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return;
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}
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/* Skip to first argument to check. */
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while (arg_num + 1 < info->first_arg_num)
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{
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if (params == 0)
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return;
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params = TREE_CHAIN (params);
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++arg_num;
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}
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while (1)
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{
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if (*format_chars == 0)
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{
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if (format_chars - TREE_STRING_POINTER (format_tree) != format_length)
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warning ("embedded `\\0' in format");
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if (info->first_arg_num != 0 && params != 0)
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warning ("too many arguments for format");
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return;
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}
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if (*format_chars++ != '%')
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continue;
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if (*format_chars == 0)
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{
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warning ("spurious trailing `%%' in format");
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continue;
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}
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if (*format_chars == '%')
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{
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++format_chars;
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continue;
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}
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flag_chars[0] = 0;
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suppressed = wide = precise = FALSE;
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if (info->is_scan)
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{
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suppressed = *format_chars == '*';
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if (suppressed)
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++format_chars;
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while (isdigit (*format_chars))
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++format_chars;
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}
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else
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{
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while (*format_chars != 0 && index (" +#0-", *format_chars) != 0)
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{
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if (index (flag_chars, *format_chars) != 0)
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{
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sprintf (message, "repeated `%c' flag in format",
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*format_chars);
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warning (message);
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}
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i = strlen (flag_chars);
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flag_chars[i++] = *format_chars++;
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flag_chars[i] = 0;
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}
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/* "If the space and + flags both appear,
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the space flag will be ignored." */
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if (index (flag_chars, ' ') != 0
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&& index (flag_chars, '+') != 0)
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warning ("use of both ` ' and `+' flags in format");
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/* "If the 0 and - flags both appear,
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the 0 flag will be ignored." */
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if (index (flag_chars, '0') != 0
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&& index (flag_chars, '-') != 0)
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warning ("use of both `0' and `-' flags in format");
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if (*format_chars == '*')
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{
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wide = TRUE;
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/* "...a field width...may be indicated by an asterisk.
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In this case, an int argument supplies the field width..." */
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++format_chars;
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if (params == 0)
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{
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warning (tfaff);
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return;
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}
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if (info->first_arg_num != 0)
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{
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cur_param = TREE_VALUE (params);
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params = TREE_CHAIN (params);
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++arg_num;
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/* size_t is generally not valid here.
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It will work on most machines, because size_t and int
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have the same mode. But might as well warn anyway,
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since it will fail on other machines. */
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if (TYPE_MAIN_VARIANT (TREE_TYPE (cur_param))
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!= integer_type_node)
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{
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sprintf (message,
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"field width is not type int (arg %d)",
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arg_num);
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warning (message);
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}
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}
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}
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else
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{
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while (isdigit (*format_chars))
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{
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wide = TRUE;
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++format_chars;
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}
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}
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if (*format_chars == '.')
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{
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precise = TRUE;
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++format_chars;
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if (*format_chars != '*' && !isdigit (*format_chars))
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warning ("`.' not followed by `*' or digit in format");
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/* "...a...precision...may be indicated by an asterisk.
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In this case, an int argument supplies the...precision." */
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if (*format_chars == '*')
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{
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if (info->first_arg_num != 0)
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{
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++format_chars;
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if (params == 0)
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{
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warning (tfaff);
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return;
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}
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cur_param = TREE_VALUE (params);
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params = TREE_CHAIN (params);
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++arg_num;
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if (TYPE_MAIN_VARIANT (TREE_TYPE (cur_param))
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!= integer_type_node)
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{
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sprintf (message,
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"field width is not type int (arg %d)",
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arg_num);
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warning (message);
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}
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}
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}
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else
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{
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while (isdigit (*format_chars))
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++format_chars;
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}
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}
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}
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if (*format_chars == 'h' || *format_chars == 'l' || *format_chars == 'L')
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length_char = *format_chars++;
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else
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length_char = 0;
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if (suppressed && length_char != 0)
|
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{
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sprintf (message,
|
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"use of `*' and `%c' together in format",
|
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length_char);
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warning (message);
|
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}
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format_char = *format_chars;
|
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if (format_char == 0)
|
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{
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warning ("conversion lacks type at end of format");
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continue;
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}
|
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format_chars++;
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fci = info->is_scan ? scan_char_table : print_char_table;
|
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while (fci->format_chars != 0
|
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&& index (fci->format_chars, format_char) == 0)
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++fci;
|
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if (fci->format_chars == 0)
|
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{
|
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if (format_char >= 040 && format_char < 0177)
|
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sprintf (message,
|
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"unknown conversion type character `%c' in format",
|
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format_char);
|
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else
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sprintf (message,
|
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"unknown conversion type character 0x%x in format",
|
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format_char);
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warning (message);
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continue;
|
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}
|
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if (wide && index (fci->flag_chars, 'w') == 0)
|
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{
|
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sprintf (message, "width used with `%c' format",
|
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format_char);
|
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warning (message);
|
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}
|
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if (precise && index (fci->flag_chars, 'p') == 0)
|
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{
|
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sprintf (message, "precision used with `%c' format",
|
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format_char);
|
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warning (message);
|
||||
}
|
||||
if (info->is_scan && format_char == '[')
|
||||
{
|
||||
/* 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 == ']')
|
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++format_chars;
|
||||
while (*format_chars && *format_chars != ']')
|
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++format_chars;
|
||||
if (*format_chars != ']')
|
||||
/* The end of the format string was reached. */
|
||||
warning ("no closing `]' for `%%[' format");
|
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}
|
||||
if (suppressed)
|
||||
{
|
||||
if (index (fci->flag_chars, '*') == 0)
|
||||
{
|
||||
sprintf (message,
|
||||
"suppression of `%c' conversion in format",
|
||||
format_char);
|
||||
warning (message);
|
||||
}
|
||||
continue;
|
||||
}
|
||||
for (i = 0; flag_chars[i] != 0; ++i)
|
||||
{
|
||||
if (index (fci->flag_chars, flag_chars[i]) == 0)
|
||||
{
|
||||
sprintf (message, "flag `%c' used with type `%c'",
|
||||
flag_chars[i], format_char);
|
||||
warning (message);
|
||||
}
|
||||
}
|
||||
if (precise && index (flag_chars, '0') != 0
|
||||
&& (format_char == 'd' || format_char == 'i'
|
||||
|| format_char == 'o' || format_char == 'u'
|
||||
|| format_char == 'x' || format_char == 'x'))
|
||||
{
|
||||
sprintf (message,
|
||||
"precision and `0' flag not both allowed with `%c' format",
|
||||
format_char);
|
||||
warning (message);
|
||||
}
|
||||
switch (length_char)
|
||||
{
|
||||
default: wanted_type = fci->nolen ? *(fci->nolen) : 0; break;
|
||||
case 'h': wanted_type = fci->hlen ? *(fci->hlen) : 0; break;
|
||||
case 'l': wanted_type = fci->llen ? *(fci->llen) : 0; break;
|
||||
case 'L': wanted_type = fci->bigllen ? *(fci->bigllen) : 0; break;
|
||||
}
|
||||
if (wanted_type == 0)
|
||||
{
|
||||
sprintf (message,
|
||||
"use of `%c' length character with `%c' type character",
|
||||
length_char, format_char);
|
||||
warning (message);
|
||||
}
|
||||
|
||||
/*
|
||||
** XXX -- should kvetch about stuff such as
|
||||
** {
|
||||
** const int i;
|
||||
**
|
||||
** scanf ("%d", &i);
|
||||
** }
|
||||
*/
|
||||
|
||||
/* Finally. . .check type of argument against desired type! */
|
||||
if (info->first_arg_num == 0)
|
||||
continue;
|
||||
if (params == 0)
|
||||
{
|
||||
warning (tfaff);
|
||||
return;
|
||||
}
|
||||
cur_param = TREE_VALUE (params);
|
||||
params = TREE_CHAIN (params);
|
||||
++arg_num;
|
||||
cur_type = TREE_TYPE (cur_param);
|
||||
|
||||
/* Check the types of any additional pointer arguments
|
||||
that precede the "real" argument. */
|
||||
for (i = 0; i < fci->pointer_count; ++i)
|
||||
{
|
||||
if (TREE_CODE (cur_type) == POINTER_TYPE)
|
||||
{
|
||||
cur_type = TREE_TYPE (cur_type);
|
||||
continue;
|
||||
}
|
||||
sprintf (message,
|
||||
"format argument is not a %s (arg %d)",
|
||||
((fci->pointer_count == 1) ? "pointer" : "pointer to a pointer"),
|
||||
arg_num);
|
||||
warning (message);
|
||||
break;
|
||||
}
|
||||
|
||||
/* Check the type of the "real" argument, if there's a type we want. */
|
||||
if (i == fci->pointer_count && wanted_type != 0
|
||||
&& wanted_type != TYPE_MAIN_VARIANT (cur_type)
|
||||
/* If we want `void *', allow any pointer type.
|
||||
(Anything else would already have got a warning.) */
|
||||
&& ! (wanted_type == void_type_node
|
||||
&& fci->pointer_count > 0)
|
||||
/* Don't warn about differences merely in signedness. */
|
||||
&& !(TREE_CODE (wanted_type) == INTEGER_TYPE
|
||||
&& TREE_CODE (cur_type) == INTEGER_TYPE
|
||||
&& (wanted_type == (TREE_UNSIGNED (wanted_type)
|
||||
? unsigned_type : signed_type) (cur_type))))
|
||||
{
|
||||
register char *this;
|
||||
register char *that;
|
||||
|
||||
this = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (wanted_type)));
|
||||
that = 0;
|
||||
if (TREE_CODE (cur_type) != ERROR_MARK
|
||||
&& TYPE_NAME (cur_type) != 0
|
||||
&& TREE_CODE (cur_type) != INTEGER_TYPE
|
||||
&& !(TREE_CODE (cur_type) == POINTER_TYPE
|
||||
&& TREE_CODE (TREE_TYPE (cur_type)) == INTEGER_TYPE))
|
||||
{
|
||||
if (TREE_CODE (TYPE_NAME (cur_type)) == TYPE_DECL
|
||||
&& DECL_NAME (TYPE_NAME (cur_type)) != 0)
|
||||
that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (cur_type)));
|
||||
else
|
||||
that = IDENTIFIER_POINTER (TYPE_NAME (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 (cur_type) == POINTER_TYPE)
|
||||
that = "pointer";
|
||||
else
|
||||
that = "different type";
|
||||
}
|
||||
|
||||
if (strcmp (this, that) != 0)
|
||||
{
|
||||
sprintf (message, "%s format, %s arg (arg %d)",
|
||||
this, that, arg_num);
|
||||
warning (message);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Print a warning if a constant expression had overflow in folding.
|
||||
Invoke this function on every expression that the language
|
||||
requires to be a constant expression.
|
||||
|
|
|
|||
Loading…
Reference in New Issue