clang/test/Sema/no-builtin.cpp

   1 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -fsyntax-only -verify %s
   2 // UNSUPPORTED: ppc64be
   3
   4 /// Prevent use of all builtins.
   5 void valid_attribute_all_1() __attribute__((no_builtin)) {}
   6 void valid_attribute_all_2() __attribute__((no_builtin())) {}
   7
   8 /// Prevent use of specific builtins.
   9 void valid_attribute_function() __attribute__((no_builtin("memcpy"))) {}
  10 void valid_attribute_functions() __attribute__((no_builtin("memcpy"))) __attribute__((no_builtin("memcmp"))) {}
  11
  12 /// Many times the same builtin is fine.
  13 void many_attribute_function_1() __attribute__((no_builtin)) __attribute__((no_builtin)) {}
  14 void many_attribute_function_2() __attribute__((no_builtin("memcpy"))) __attribute__((no_builtin("memcpy"))) {}
  15 void many_attribute_function_3() __attribute__((no_builtin("memcpy", "memcpy"))) {}
  16 void many_attribute_function_4() __attribute__((no_builtin("memcpy", "memcpy"))) __attribute__((no_builtin("memcpy"))) {}
  17
  18 /// Invalid builtin name.
  19 void invalid_builtin() __attribute__((no_builtin("not_a_builtin"))) {}
  20 // expected-warning@-1 {{'not_a_builtin' is not a valid builtin name for 'no_builtin'}}
  21
  22 /// Can't use bare no_builtin with a named one.
  23 void wildcard_and_functionname() __attribute__((no_builtin)) __attribute__((no_builtin("memcpy"))) {}
  24 // expected-error@-1 {{empty 'no_builtin' cannot be composed with named ones}}
  25
  26 /// Can't attach attribute to a variable.
  27 int __attribute__((no_builtin)) variable;
  28 // expected-warning@-1 {{'no_builtin' attribute only applies to functions}}
  29
  30 /// Can't attach attribute to a declaration.
  31 void nobuiltin_on_declaration() __attribute__((no_builtin));
  32 // expected-error@-1 {{no_builtin attribute is permitted on definitions only}}
  33
  34 struct S {
  35   /// Can't attach attribute to a defaulted function,
  36   S()
  37   __attribute__((no_builtin)) = default;
  38   // expected-error@-1 {{no_builtin attribute has no effect on defaulted or deleted functions}}
  39
  40   /// Can't attach attribute to a deleted function,
  41   S(const S &)
  42   __attribute__((no_builtin)) = delete;
  43   // expected-error@-1 {{no_builtin attribute has no effect on defaulted or deleted functions}}
  44
  45   void whatever() __attribute__((no_builtin("memcpy")));
  46   // expected-error@-1 {{no_builtin attribute is permitted on definitions only}}
  47 };
  48
  49 /// Can't attach attribute to an aliased function.
  50 void alised_function() {}
  51 void aliasing_function() __attribute__((no_builtin)) __attribute__((alias("alised_function")));
  52 // expected-error@-1 {{no_builtin attribute is permitted on definitions only}}