// RUN: %clang_cc1 %s -verify=expected,access -fsyntax-only
// RUN: %clang_cc1 %s -std=c2x -verify=expected,access -fsyntax-only
// RUN: %clang_cc1 %s -std=c2x -pedantic -verify=expected,access -fsyntax-only
// RUN: %clang_cc1 %s -verify -fsyntax-only -Wno-atomic-access
// RUN: %clang_cc1 %s -verify=expected,access -fsyntax-only -fexperimental-new-constant-interpreter
// RUN: %clang_cc1 %s -std=c2x -verify=expected,access -fsyntax-only -fexperimental-new-constant-interpreter
// RUN: %clang_cc1 %s -std=c2x -pedantic -verify=expected,access -fsyntax-only -fexperimental-new-constant-interpreter
// RUN: %clang_cc1 %s -verify -fsyntax-only -Wno-atomic-access -fexperimental-new-constant-interpreter
_Atomic(unsigned int) data1;
int _Atomic data2;
// Shift operations
int func_01 (int x) {
return data1 << x;
}
int func_02 (int x) {
return x << data1;
}
int func_03 (int x) {
return data2 << x;
}
int func_04 (int x) {
return x << data2;
}
int func_05 (void) {
return data2 << data1;
}
int func_06 (void) {
return data1 << data2;
}
void func_07 (int x) {
data1 <<= x;
}
void func_08 (int x) {
data2 <<= x;
}
void func_09 (int* xp) {
*xp <<= data1;
}
void func_10 (int* xp) {
*xp <<= data2;
}
int func_11 (int x) {
return data1 == x;
}
int func_12 (void) {
return data1 < data2;
}
int func_13 (int x, unsigned y) {
return x ? data1 : y;
}
int func_14 (void) {
return data1 == 0;
}
void func_15(void) {
// Ensure that the result of an assignment expression properly strips the
// _Atomic qualifier; Issue 48742.
_Atomic int x;
int y = (x = 2);
int z = (int)(x = 2);
y = (x = 2);
z = (int)(x = 2);
y = (x += 2);
_Static_assert(__builtin_types_compatible_p(__typeof__(x = 2), int), "incorrect");
_Static_assert(__builtin_types_compatible_p(__typeof__(x += 2), int), "incorrect");
}
// Ensure that member access of an atomic structure or union type is properly
// diagnosed as being undefined behavior; Issue 54563.
void func_16(void) {
// LHS member access.
_Atomic struct { int val; } x, *xp;
x.val = 12; // access-error {{accessing a member of an atomic structure or union is undefined behavior}}
xp->val = 12; // access-error {{accessing a member of an atomic structure or union is undefined behavior}}
_Atomic union {
int ival;
float fval;
} y, *yp;
y.ival = 12; // access-error {{accessing a member of an atomic structure or union is undefined behavior}}
yp->fval = 1.2f; // access-error {{accessing a member of an atomic structure or union is undefined behavior}}
// RHS member access.
int xval = x.val; // access-error {{accessing a member of an atomic structure or union is undefined behavior}}
xval = xp->val; // access-error {{accessing a member of an atomic structure or union is undefined behavior}}
int yval = y.ival; // access-error {{accessing a member of an atomic structure or union is undefined behavior}}
yval = yp->ival; // access-error {{accessing a member of an atomic structure or union is undefined behavior}}
// Using the type specifier instead of the type qualifier.
_Atomic(struct { int val; }) z;
z.val = 12; // access-error {{accessing a member of an atomic structure or union is undefined behavior}}
int zval = z.val; // access-error {{accessing a member of an atomic structure or union is undefined behavior}}
// Don't diagnose in an unevaluated context, however.
(void)sizeof(x.val);
(void)sizeof(xp->val);
(void)sizeof(y.ival);
(void)sizeof(yp->ival);
}
// Ensure that we correctly implement assignment constraints from C2x 6.5.16.1.
void func_17(void) {
// The left operand has atomic ... arithmetic type, and the right operand has
// arithmetic type;
_Atomic int i = 0;
_Atomic float f = 0.0f;
// the left operand has an atomic ... version of a structure or union type
// compatible with the type of the right operand;
struct S { int i; } non_atomic_s;
_Atomic struct S s = non_atomic_s;
union U { int i; float f; } non_atomic_u;
_Atomic union U u = non_atomic_u;
// the left operand has atomic ... pointer type, and (considering the type
// the left operand would have after lvalue conversion) both operands are
// pointers to qualified or unqualified versions of compatible types, and the
// type pointed to by the left operand has all the qualifiers of the type
// pointed to by the right operand;
const int *cip = 0;
volatile const int *vcip = 0;
const int * const cicp = 0;
_Atomic(const int *) acip = cip;
_Atomic(const int *) bad_acip = vcip; // expected-warning {{initializing '_Atomic(const int *)' with an expression of type 'const volatile int *' discards qualifiers}}
_Atomic(const int *) acip2 = cicp;
_Atomic(int *) aip = &i; // expected-warning {{incompatible pointer types initializing '_Atomic(int *)' with an expression of type '_Atomic(int) *'}} \
// the left operand has atomic ... pointer type, and (considering the type
// the left operand would have after lvalue conversion) one operand is a
// pointer to an object type, and the other is a pointer to a qualified or
// unqualified version of void, and the type pointed to by the left operand
// has all the qualifiers of the type pointed to by the right operand;
const void *cvp = 0;
_Atomic(const int *) acip3 = cvp;
_Atomic(const void *) acvip = cip;
_Atomic(const int *) acip4 = vcip; // expected-warning {{initializing '_Atomic(const int *)' with an expression of type 'const volatile int *' discards qualifiers}}
_Atomic(const void *) acvip2 = vcip; // expected-warning {{initializing '_Atomic(const void *)' with an expression of type 'const volatile int *' discards qualifiers}}
_Atomic(const int *) acip5 = cicp;
_Atomic(const void *) acvip3 = cicp;
#if __STDC_VERSION__ >= 202311L
// the left operand has an atomic ... version of the nullptr_t type and the
// right operand is a null pointer constant or its type is nullptr_t
typedef typeof(nullptr) nullptr_t;
nullptr_t n;
_Atomic nullptr_t cn2 = n;
_Atomic nullptr_t cn3 = nullptr;
#endif // __STDC_VERSION__ >= 202311L
// the left operand is an atomic ... pointer, and the right operand is a null
// pointer constant or its type is nullptr_t;
_Atomic(int *) aip2 = 0;
#if __STDC_VERSION__ >= 202311L
_Atomic(int *) ip2 = n;
_Atomic(int *) ip3 = nullptr;
_Atomic(const int *) ip4 = nullptr;
#endif // __STDC_VERSION__ >= 202311L
}
// Ensure that the assignment constraints also work at file scope.
_Atomic int ai = 0;
_Atomic float af = 0.0f;
_Atomic(int *) aip1 = 0;
struct S { int a; } non_atomic_s;
_Atomic struct S as = non_atomic_s; // expected-error {{initializer element is not a compile-time constant}}
const int *cip = 0;
_Atomic(const int *) acip1 = cip; // expected-error {{initializer element is not a compile-time constant}}
const void *cvp = 0;
_Atomic(const int *) acip2 = cvp; // expected-error {{initializer element is not a compile-time constant}}
#if __STDC_VERSION__ >= 202311L
// the left operand has an atomic ... version of the nullptr_t type and the
// right operand is a null pointer constant or its type is nullptr_t
typedef typeof(nullptr) nullptr_t;
nullptr_t n;
_Atomic nullptr_t cn2 = n; // expected-error {{initializer element is not a compile-time constant}}
_Atomic(int *) aip2 = nullptr;
#endif // __STDC_VERSION__ >= 202311L
// FIXME: &ai is an address constant, so this should be accepted as an
// initializer, but the bit-cast inserted due to the pointer conversion is
// tripping up the test for whether the initializer is a constant expression.
// The warning is correct but the error is not.
_Atomic(int *) aip3 = &ai; /* expected-warning {{incompatible pointer types initializing '_Atomic(int *)' with an expression of type '_Atomic(int) *'}}
expected-error {{initializer element is not a compile-time constant}}
*/
// Test the behavior when converting the null pointer constant to an atomic
// function pointer.
_Atomic(int (*)(char)) afp = (void *)0;
void func_18(void) {
// Ensure we can cast to atomic scalar types.
data2 = (_Atomic int)0;
(void)(_Atomic(int *))0;
// But that we correctly reject casts to atomic aggregate types.
struct S { int a; } s;
struct T { int a; };
(void)(_Atomic struct T)s; // expected-error {{used type 'struct T' where arithmetic or pointer type is required}}
}
// Test if we can handle an _Atomic qualified integer in a switch statement.
void func_19(void) {
_Atomic int a = 0;
switch (a) { }
}
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