clang/test/CodeGen/attr-ifunc.c

   1 // RUN: %clang_cc1 -triple x86_64-windows -fsyntax-only -verify %s
   2 // RUN: %clang_cc1 -triple x86_64-linux -fsyntax-only -verify -emit-llvm-only -DCHECK_ALIASES %s
   3 // RUN: %clang_cc1 -triple x86_64-linux -fsyntax-only -verify -emit-llvm-only %s
   4
   5 #if defined(_WIN32)
   6 void foo(void) {}
   7 void bar(void) __attribute__((ifunc("foo")));
   8 // expected-warning@-1 {{unknown attribute 'ifunc' ignored}}
   9
  10 #else
  11 #if defined(CHECK_ALIASES)
  12 void *f1_ifunc(void);
  13 void f1(void) __attribute__((ifunc("f1_ifunc")));
  14 // expected-error@-1 {{ifunc must point to a defined function}}
  15
  16 void *f2_a(void) __attribute__((alias("f2_b")));
  17 void *f2_b(void) __attribute__((ifunc("f2_a")));
  18 // expected-error@-1 {{ifunc definition is part of a cycle}}
  19
  20 void *f3_a(void) __attribute__((ifunc("f3_b")));
  21 // expected-warning@-1 {{ifunc will always resolve to f3_c even if weak definition of f3_b is overridden}}
  22 void *f3_b(void) __attribute__((weak, alias("f3_c")));
  23 void *f3_c(void) { return 0; }
  24
  25 void f4_ifunc(void) {}
  26 void f4(void) __attribute__((ifunc("f4_ifunc")));
  27 // expected-error@-1 {{ifunc resolver function must return a pointer}}
  28
  29 int f5_resolver_gvar;
  30 void f5(void) __attribute__((ifunc("f5_resolver_gvar")));
  31 // expected-error@-1 {{ifunc must point to a defined function}}
  32
  33 void *f6_resolver_resolver(void) { return 0; }
  34 void *f6_resolver(void) __attribute__((ifunc("f6_resolver_resolver")));
  35 void f6(void) __attribute__((ifunc("f6_resolver")));
  36 // expected-error@-1 {{ifunc must point to a defined function}}
  37
  38 #else
  39 void f1a(void) __asm("f1");
  40 void f1a(void) {}
  41 // expected-note@-1 {{previous definition is here}}
  42 void f1(void) __attribute__((ifunc("f1_ifunc")));
  43 // expected-error@-1 {{definition with same mangled name 'f1' as another definition}}
  44 void *f1_ifunc(void) { return 0; }
  45
  46 void *f6_ifunc(int i);
  47 void __attribute__((ifunc("f6_ifunc"))) f6(void) {}
  48 // expected-error@-1 {{definition 'f6' cannot also be an ifunc}}
  49
  50 #endif
  51 #endif