/* 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. */
+ /* If warnings should be of the form "field precision should have
+ type 'int'", the name to use (in this case "field precision"),
+ otherwise NULL, for "format expects type 'long'" type
+ messages. */
const char *name;
/* The actual parameter to check against the wanted type. */
tree param;
static const format_flag_spec *get_flag_spec (const format_flag_spec *,
int, const char *);
-static void check_format_types (format_wanted_type *);
+static void check_format_types (format_wanted_type *, const char *, int);
+static void format_type_warning (const char *, const char *, int, tree,
+ int, const char *, tree, int);
/* 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
const format_char_info *fci = NULL;
char flag_chars[256];
int aflag = 0;
+ const char *format_start = format_chars;
if (*format_chars == 0)
{
if (format_chars - orig_format_chars != format_length)
}
if (first_wanted_type != 0)
- check_format_types (first_wanted_type);
+ check_format_types (first_wanted_type, format_start,
+ format_chars - format_start);
}
}
/* Check the argument types from a single format conversion (possibly
including width and precision arguments). */
static void
-check_format_types (format_wanted_type *types)
+check_format_types (format_wanted_type *types, const char *format_start,
+ int format_length)
{
for (; types != 0; types = types->next)
{
cur_type = TREE_TYPE (cur_param);
if (cur_type == error_mark_node)
continue;
+ orig_cur_type = cur_type;
char_type_flag = 0;
wanted_type = types->wanted_type;
arg_num = types->arg_num;
if (types->pointer_count == 0)
wanted_type = lang_hooks.types.type_promotes_to (wanted_type);
+ wanted_type = TYPE_MAIN_VARIANT (wanted_type);
+
STRIP_NOPS (cur_param);
/* Check the types of any additional pointer arguments
}
else
{
- if (types->pointer_count == 1)
- warning ("format argument is not a pointer (arg %d)", arg_num);
- else
- warning ("format argument is not a pointer to a pointer (arg %d)", arg_num);
+ format_type_warning (types->name, format_start, format_length,
+ wanted_type, types->pointer_count,
+ types->wanted_type_name, orig_cur_type,
+ 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
&& char_type_flag)
continue;
/* Now we have a type mismatch. */
- {
- const char *this;
- const char *that;
- tree tmp;
-
- tmp = TYPE_NAME (wanted_type);
- if (TREE_CODE (tmp) == TYPE_DECL)
- tmp = DECL_NAME (tmp);
- this = IDENTIFIER_POINTER (tmp);
-
- 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))
- {
- tmp = TYPE_NAME (orig_cur_type);
- if (TREE_CODE (tmp) == TYPE_DECL)
- tmp = DECL_NAME (tmp);
- if (tmp)
- that = IDENTIFIER_POINTER (tmp);
- }
-
- /* 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");
- }
+ format_type_warning (types->name, format_start, format_length,
+ wanted_type, types->pointer_count,
+ types->wanted_type_name, orig_cur_type, arg_num);
+ }
+}
- /* 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)
- warning ("%s is not type %s (arg %d)", types->name, this,
- arg_num);
- else
- warning ("%s format, %s arg (arg %d)", this, that, arg_num);
- }
- }
+/* Give a warning about a format argument of different type from that
+ expected. DESCR is a description such as "field precision", or
+ NULL for an ordinary format. For an ordinary format, FORMAT_START
+ points to where the format starts in the format string and
+ FORMAT_LENGTH is its length. WANTED_TYPE is the type the argument
+ should have after POINTER_COUNT pointer dereferences.
+ WANTED_NAME_NAME is a possibly more friendly name of WANTED_TYPE,
+ or NULL if the ordinary name of the type should be used. ARG_TYPE
+ is the type of the actual argument. ARG_NUM is the number of that
+ argument. */
+static void
+format_type_warning (const char *descr, const char *format_start,
+ int format_length, tree wanted_type, int pointer_count,
+ const char *wanted_type_name, tree arg_type, int arg_num)
+{
+ char *p;
+ /* If ARG_TYPE is a typedef with a misleading name (for example,
+ size_t but not the standard size_t expected by printf %zu), avoid
+ printing the typedef name. */
+ if (wanted_type_name
+ && TYPE_NAME (arg_type)
+ && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL
+ && DECL_NAME (TYPE_NAME (arg_type))
+ && !strcmp (wanted_type_name,
+ lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2)))
+ arg_type = TYPE_MAIN_VARIANT (arg_type);
+ /* The format type and name exclude any '*' for pointers, so those
+ must be formatted manually. For all the types we currently have,
+ this is adequate, but formats taking pointers to functions or
+ arrays would require the full type to be built up in order to
+ print it with %T. */
+ p = alloca (pointer_count + 2);
+ if (pointer_count == 0)
+ p[0] = 0;
+ else if (c_dialect_cxx ())
+ {
+ memset (p, '*', pointer_count);
+ p[pointer_count] = 0;
+ }
+ else
+ {
+ p[0] = ' ';
+ memset (p + 1, '*', pointer_count);
+ p[pointer_count + 1] = 0;
+ }
+ if (wanted_type_name)
+ {
+ if (descr)
+ warning ("%s should have type %<%s%s%>, but argument %d has type %qT",
+ descr, wanted_type_name, p, arg_num, arg_type);
+ else
+ warning ("format %q.*s expects type %<%s%s%>, but argument %d has type %qT",
+ format_length, format_start, wanted_type_name, p,
+ arg_num, arg_type);
+ }
+ else
+ {
+ if (descr)
+ warning ("%s should have type %<%T%s%>, but argument %d has type %qT",
+ descr, wanted_type, p, arg_num, arg_type);
+ else
+ warning ("format %q.*s expects type %<%T%s%>, but argument %d has type %qT",
+ format_length, format_start, wanted_type, p, arg_num, arg_type);
}
}
+
/* Given a format_char_info array FCI, and a character C, this function
returns the index into the conversion_specs where that specifier's
data is located. If the character isn't found it aborts. */
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