clang/test/Sema/no-builtin.cpp

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