gcc/testsuite/gcc.dg/format/attr-3.c

   1 /* Test for format attributes: test bad uses of __attribute__.  */
   2 /* Origin: Joseph Myers <jsm28@cam.ac.uk> */
   3 /* { dg-do compile } */
   4 /* { dg-options "-std=gnu99 -Wformat" } */
   5
   6 #include "format.h"
   7
   8 /* Proper uses of the attributes.  */
   9 extern void fa0 (const char *, ...) __attribute__((format(printf, 1, 2)));
  10 extern void fa1 (char *, ...) __attribute__((format(printf, 1, 2)));
  11 extern char *fa2 (const char *) __attribute__((format_arg(1)));
  12 extern char *fa3 (char *) __attribute__((format_arg(1)));
  13
  14 /* Uses with too few or too many arguments.  */
  15 extern void fb0 (const char *, ...) __attribute__((format)); /* { dg-error "wrong number of arguments" "bad format" } */
  16 extern void fb1 (const char *, ...) __attribute__((format())); /* { dg-error "wrong number of arguments" "bad format" } */
  17 extern void fb2 (const char *, ...) __attribute__((format(printf))); /* { dg-error "wrong number of arguments" "bad format" } */
  18 extern void fb3 (const char *, ...) __attribute__((format(printf, 1))); /* { dg-error "wrong number of arguments" "bad format" } */
  19 extern void fb4 (const char *, ...) __attribute__((format(printf, 1, 2, 3))); /* { dg-error "wrong number of arguments" "bad format" } */
  20
  21 extern void fc1 (const char *) __attribute__((format_arg)); /* { dg-error "wrong number of arguments" "bad format_arg" } */
  22 extern void fc2 (const char *) __attribute__((format_arg())); /* { dg-error "wrong number of arguments" "bad format_arg" } */
  23 extern void fc3 (const char *) __attribute__((format_arg(1, 2))); /* { dg-error "wrong number of arguments" "bad format_arg" } */
  24
  25 /* These attributes presently only apply to declarations, not to types.
  26    Eventually, they should be usable with declarators for function types
  27    anywhere, but still not with structure/union/enum types.  */
  28 struct s0 { int i; } __attribute__((format(printf, 1, 2))); /* { dg-error "does not apply|only applies" "format on struct" } */
  29 union u0 { int i; } __attribute__((format(printf, 1, 2))); /* { dg-error "does not apply|only applies" "format on union" } */
  30 enum e0 { E0V0 } __attribute__((format(printf, 1, 2))); /* { dg-error "does not apply|only applies" "format on enum" } */
  31
  32 struct s1 { int i; } __attribute__((format_arg(1))); /* { dg-error "does not apply|only applies" "format_arg on struct" } */
  33 union u1 { int i; } __attribute__((format_arg(1))); /* { dg-error "does not apply|only applies" "format_arg on union" } */
  34 enum e1 { E1V0 } __attribute__((format_arg(1))); /* { dg-error "does not apply|only applies" "format_arg on enum" } */
  35
  36 /* The format type must be an identifier, one of those recognized.  */
  37 extern void fe0 (const char *, ...) __attribute__((format(12345, 1, 2))); /* { dg-error "format specifier" "non-id format" } */
  38 extern void fe1 (const char *, ...) __attribute__((format(nosuch, 1, 2))); /* { dg-warning "format function type" "unknown format" } */
  39
  40 /* Both the numbers must be integer constant expressions.  */
  41 extern void ff0 (const char *, ...) __attribute__((format(printf, 3-2, (long long)(10/5))));
  42 int foo;
  43 extern void ff1 (const char *, ...) __attribute__((format(printf, foo, 10/5))); /* { dg-error "invalid operand" "bad number" } */
  44 extern void ff2 (const char *, ...) __attribute__((format(printf, 3-2, foo))); /* { dg-error "invalid operand" "bad number" } */
  45 extern char *ff3 (const char *) __attribute__((format_arg(3-2)));
  46 extern char *ff4 (const char *) __attribute__((format_arg(foo))); /* { dg-error "invalid operand" "bad format_arg number" } */
  47
  48 /* The format string argument must precede the arguments to be formatted.
  49    This includes if no parameter types are specified (which is not valid ISO
  50    C for variadic functions).  */
  51 extern void fg0 () __attribute__((format(printf, 1, 2)));
  52 extern void fg1 () __attribute__((format(printf, 1, 0)));
  53 extern void fg2 () __attribute__((format(printf, 1, 1))); /* { dg-error "follows" "bad number order" } */
  54 extern void fg3 () __attribute__((format(printf, 2, 1))); /* { dg-error "follows" "bad number order" } */
  55
  56 /* The format string argument must be a string type, and the arguments to
  57    be formatted must be the "...".  */
  58 extern void fh0 (int, ...) __attribute__((format(printf, 1, 2))); /* { dg-error "not a string" "format int string" } */
  59 extern void fh1 (signed char *, ...) __attribute__((format(printf, 1, 2))); /* { dg-error "not a string" "signed char string" } */
  60 extern void fh2 (unsigned char *, ...) __attribute__((format(printf, 1, 2))); /* { dg-error "not a string" "unsigned char string" } */
  61 extern void fh3 (const char *, ...) __attribute__((format(printf, 1, 3))); /* { dg-error "is not" "not ..." } */
  62 extern void fh4 (const char *, int, ...) __attribute__((format(printf, 1, 2))); /* { dg-error "is not" "not ..." } */
  63
  64 /* format_arg formats must take and return a string.  */
  65 extern char *fi0 (int) __attribute__((format_arg(1))); /* { dg-error "not a string" "format_arg int string" } */
  66 extern char *fi1 (signed char *) __attribute__((format_arg(1))); /* { dg-error "not a string" "format_arg signed char string" } */
  67 extern char *fi2 (unsigned char *) __attribute__((format_arg(1))); /* { dg-error "not a string" "format_arg unsigned char string" } */
  68 extern int fi3 (const char *) __attribute__((format_arg(1))); /* { dg-error "not return string" "format_arg ret int string" } */
  69 extern signed char *fi4 (const char *) __attribute__((format_arg(1))); /* { dg-error "not return string" "format_arg ret signed char string" } */
  70 extern unsigned char *fi5 (const char *) __attribute__((format_arg(1))); /* { dg-error "not return string" "format_arg ret unsigned char string" } */