forked from OSchip/llvm-project
89 lines
5.1 KiB
C
89 lines
5.1 KiB
C
// RUN: %clang_cc1 -std=c11 -fsyntax-only -Wno-strict-prototypes -Wno-implicit-function-declaration -verify %s
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// RUN: %clang_cc1 -std=c99 -pedantic -fsyntax-only -Wno-strict-prototypes -Wno-implicit-function-declaration -verify=expected,ext %s
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void g(void);
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void foo(int n) {
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(void) _Generic(0, // ext-warning {{'_Generic' is a C11 extension}}
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struct A: 0, // expected-error {{type 'struct A' in generic association incomplete}}
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void(): 0, // expected-error {{type 'void ()' in generic association not an object type}}
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int[n]: 0); // expected-error {{type 'int[n]' in generic association is a variably modified type}}
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(void) _Generic(0, // ext-warning {{'_Generic' is a C11 extension}}
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void (*)(): 0, // expected-note {{compatible type 'void (*)()' specified here}}
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void (*)(void): 0); // expected-error {{type 'void (*)(void)' in generic association compatible with previously specified type 'void (*)()'}}
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(void) _Generic((void (*)()) 0, // expected-error {{controlling expression type 'void (*)()' compatible with 2 generic association types}} \
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// ext-warning {{'_Generic' is a C11 extension}}
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void (*)(int): 0, // expected-note {{compatible type 'void (*)(int)' specified here}}
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void (*)(void): 0); // expected-note {{compatible type 'void (*)(void)' specified here}}
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(void) _Generic(0, // expected-error {{controlling expression type 'int' not compatible with any generic association type}} \
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// ext-warning {{'_Generic' is a C11 extension}}
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char: 0, short: 0, long: 0);
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int a1[_Generic(0, int: 1, short: 2, float: 3, default: 4) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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int a2[_Generic(0, default: 1, short: 2, float: 3, int: 4) == 4 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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int a3[_Generic(0L, int: 1, short: 2, float: 3, default: 4) == 4 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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int a4[_Generic(0L, default: 1, short: 2, float: 3, int: 4) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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int a5[_Generic(0, int: 1, short: 2, float: 3) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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int a6[_Generic(0, short: 1, float: 2, int: 3) == 3 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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int a7[_Generic("test", char *: 1, default: 2) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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int a8[_Generic(g, void (*)(void): 1, default: 2) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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const int i = 12;
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int a9[_Generic(i, int: 1, default: 2) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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// This is expected to not trigger any diagnostics because the controlling
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// expression is not evaluated.
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(void)_Generic(*(int *)0, int: 1); // ext-warning {{'_Generic' is a C11 extension}}
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}
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int __attribute__((overloadable)) test (int);
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double __attribute__((overloadable)) test (double);
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char testc(char);
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void PR30201(void) {
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_Generic(4, char:testc, default:test)(4); // ext-warning {{'_Generic' is a C11 extension}}
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}
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void GH50227(void) {
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// Previously, the controlling expression for the outer _Generic makes it
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// result dependent, and testing whether that controlling expression has side
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// effects would cause a crash.
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_Generic( // ext-warning {{'_Generic' is a C11 extension}}
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n(
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_Generic(n++, int : 0) // expected-error {{cannot increment value of type 'int ()'}} ext-warning {{'_Generic' is a C11 extension}}
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), int : 0);
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}
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struct Test {
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int i;
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};
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void unreachable_associations(const int i, const struct Test t) {
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_Static_assert( // ext-warning {{'_Static_assert' is a C11 extension}}
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_Generic(i, // ext-warning {{'_Generic' is a C11 extension}}
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const int : 1, // expected-warning {{due to lvalue conversion of the controlling expression, association of type 'const int' will never be selected because it is qualified}}
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volatile int : 2, // expected-warning {{due to lvalue conversion of the controlling expression, association of type 'volatile int' will never be selected because it is qualified}}
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int[12] : 3, // expected-warning {{due to lvalue conversion of the controlling expression, association of type 'int[12]' will never be selected because it is of array type}}
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int : 4,
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default : 5
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) == 4, "we had better pick int!");
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_Static_assert( // ext-warning {{'_Static_assert' is a C11 extension}}
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_Generic(t, // ext-warning {{'_Generic' is a C11 extension}}
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struct Test : 1,
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const struct Test : 2, // expected-warning {{due to lvalue conversion of the controlling expression, association of type 'const struct Test' will never be selected because it is qualified}}
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default : 3
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) == 1, "we had better pick struct Test, not const struct Test!"); // C-specific result
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}
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void GH55562(void) {
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// Ensure that you can still define a type within a generic selection
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// association (despite it not being particularly useful).
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(void)_Generic(1, struct S { int a; } : 0, default : 0); // ext-warning {{'_Generic' is a C11 extension}}
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struct S s = { 0 };
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int i = s.a;
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}
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