33 lines
2.5 KiB
C
33 lines
2.5 KiB
C
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// RUN: %clang_cc1 %s -fsyntax-only -verify -pedantic -Wextra -std=c11
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// RUN: %clang_cc1 %s -fsyntax-only -triple i686-unknown-unknown -verify -pedantic -Wextra -std=c11
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// RUN: %clang_cc1 %s -fsyntax-only -triple x86_64-unknown-unknown -verify -pedantic -Wextra -std=c11
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#include <stdint.h>
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typedef struct S S; // expected-note 4 {{forward declaration of 'struct S'}}
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extern _Atomic(S*) e;
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void a(S* b, void* c) {
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void (*fp)(int) = 0;
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b++; // expected-error {{arithmetic on a pointer to an incomplete type}}
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b += 1; // expected-error {{arithmetic on a pointer to an incomplete type}}
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c++; // expected-warning {{arithmetic on a pointer to void is a GNU extension}}
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c += 1; // expected-warning {{arithmetic on a pointer to void is a GNU extension}}
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c--; // expected-warning {{arithmetic on a pointer to void is a GNU extension}}
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c -= 1; // expected-warning {{arithmetic on a pointer to void is a GNU extension}}
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(void) c[1]; // expected-warning {{subscript of a pointer to void is a GNU extension}}
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b = 1+b; // expected-error {{arithmetic on a pointer to an incomplete type}}
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/* The next couple tests are only pedantic warnings in gcc */
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void (*d)(S*,void*) = a;
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d += 1; // expected-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
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d++; // expected-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
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d--; // expected-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
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d -= 1; // expected-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
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(void)(1 + d); // expected-warning {{arithmetic on a pointer to the function type 'void (S *, void *)' (aka 'void (struct S *, void *)') is a GNU extension}}
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e++; // expected-error {{arithmetic on a pointer to an incomplete type}}
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intptr_t i = (intptr_t)b;
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char *f = (char*)0 + i; // expected-warning {{arithmetic on a null pointer treated as a cast from integer to pointer is a GNU extension}}
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// Cases that don't match the GNU inttoptr idiom get a different warning.
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f = (char*)0 - i; // expected-warning {{performing pointer arithmetic on a null pointer has undefined behavior}}
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int *g = (int*)0 + i; // expected-warning {{performing pointer arithmetic on a null pointer has undefined behavior}}
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}
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