8bddfdd59c
When ifunc support was added to Clang (r265917) it did not allow resolvers to take function arguments. This was based on GCC's documentation, which states resolvers return a pointer and take no arguments. However, GCC actually allows resolvers to take arguments, and glibc (on non-x86 platforms) and FreeBSD (on x86 and arm64) pass some CPU identification information as arguments to ifunc resolvers. I believe GCC's documentation is simply incorrect / out-of-date. FreeBSD already removed the prohibition in their in-tree Clang copy. Differential Revision: https://reviews.llvm.org/D52703 llvm-svn: 344100
44 lines
1.5 KiB
C
44 lines
1.5 KiB
C
// RUN: %clang_cc1 -triple x86_64-windows -fsyntax-only -verify %s
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// RUN: %clang_cc1 -triple x86_64-linux -fsyntax-only -verify -emit-llvm-only -DCHECK_ALIASES %s
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// RUN: %clang_cc1 -triple x86_64-linux -fsyntax-only -verify -emit-llvm-only %s
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#if defined(_WIN32)
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void foo() {}
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void bar() __attribute__((ifunc("foo")));
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//expected-warning@-1 {{unknown attribute 'ifunc' ignored}}
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#else
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#if defined(CHECK_ALIASES)
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void* f1_ifunc();
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void f1() __attribute__((ifunc("f1_ifunc")));
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//expected-error@-1 {{ifunc must point to a defined function}}
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void* f2_a() __attribute__((ifunc("f2_b")));
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//expected-error@-1 {{ifunc definition is part of a cycle}}
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void* f2_b() __attribute__((ifunc("f2_a")));
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//expected-error@-1 {{ifunc definition is part of a cycle}}
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void* f3_a() __attribute__((ifunc("f3_b")));
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//expected-warning@-1 {{ifunc will always resolve to f3_c even if weak definition of f3_b is overridden}}
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void* f3_b() __attribute__((weak, alias("f3_c")));
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void* f3_c() { return 0; }
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void f4_ifunc() {}
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void f4() __attribute__((ifunc("f4_ifunc")));
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//expected-error@-1 {{ifunc resolver function must return a pointer}}
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#else
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void f1a() __asm("f1");
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void f1a() {}
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//expected-note@-1 {{previous definition is here}}
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void f1() __attribute__((ifunc("f1_ifunc")));
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//expected-error@-1 {{definition with same mangled name 'f1' as another definition}}
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void* f1_ifunc() { return 0; }
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void* f6_ifunc(int i);
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void __attribute__((ifunc("f6_ifunc"))) f6() {}
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//expected-error@-1 {{definition 'f6' cannot also be an ifunc}}
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#endif
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#endif
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