55a51e1c79
An empty string literal in an asm label does not make a whole lot of sense. GCC does not diagnose such a construct, but it also generates code that cannot be assembled by gas should two symbols have an empty asm label within the same TU. This does not affect an asm statement with an empty string literal, which is still a useful construct.
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
// RUN: %clang_cc1 -fsyntax-only -verify %s
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#if !__has_extension(gnu_asm)
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#error Extension 'gnu_asm' should be available by default
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#endif
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void f1() {
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// PR7673: Some versions of GCC support an empty clobbers section.
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asm ("ret" : : :);
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}
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void f2() {
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asm("foo" : "=r" (a)); // expected-error {{use of undeclared identifier 'a'}}
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asm("foo" : : "r" (b)); // expected-error {{use of undeclared identifier 'b'}}
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asm const (""); // expected-warning {{ignored const qualifier on asm}}
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asm volatile ("");
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asm restrict (""); // expected-warning {{ignored restrict qualifier on asm}}
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// FIXME: Once GCC supports _Atomic, check whether it allows this.
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asm _Atomic (""); // expected-warning {{ignored _Atomic qualifier on asm}}
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}
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void a() __asm__(""); // expected-error {{cannot use an empty string literal in 'asm'}}
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void a() {
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__asm__(""); // ok
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}
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// rdar://5952468
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__asm ; // expected-error {{expected '(' after 'asm'}}
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// <rdar://problem/10465079> - Don't crash on wide string literals in 'asm'.
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int foo asm (L"bar"); // expected-error {{cannot use wide string literal in 'asm'}}
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asm() // expected-error {{expected string literal in 'asm'}}
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// expected-error@-1 {{expected ';' after top-level asm block}}
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asm(; // expected-error {{expected string literal in 'asm'}}
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asm("") // expected-error {{expected ';' after top-level asm block}}
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// Unterminated asm strings at the end of the file were causing us to crash, so
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// this needs to be last. rdar://15624081
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// expected-warning@+3 {{missing terminating '"' character}}
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// expected-error@+2 {{expected string literal in 'asm'}}
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// expected-error@+1 {{expected ';' after top-level asm block}}
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asm("
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