llvm-project/clang/test/Sema/i-c-e.c

// RUN: %clang %s -ffreestanding -fsyntax-only -Xclang -verify -pedantic -fpascal-strings -std=c99

#include <stdint.h>
#include <limits.h>

int a() {int p; *(1 ? &p : (void*)(0 && (a(),1))) = 10;} // expected-error {{incomplete type 'void' is not assignable}}

// rdar://6091492 - ?: with __builtin_constant_p as the operand is an i-c-e.
int expr;
char w[__builtin_constant_p(expr) ? expr : 1];

char v[sizeof(__builtin_constant_p(0)) == sizeof(int) ? 1 : -1];

int implicitConversion = 1.0;
char floatArith[(int)(1.0+2.0)]; // expected-warning {{must be an integer constant expression}}

// __builtin_constant_p as the condition of ?: allows arbitrary foldable
// constants to be transmogrified into i-c-e's.
char b[__builtin_constant_p((int)(1.0+2.0)) ? (int)(1.0+2.0) : -1];

struct c {
  int a : (  // expected-error {{expression is not an integer constant expression}}
           __builtin_constant_p((int)(1.0+2.0)) ? (int)(1.0+
     expr  // expected-note {{subexpression not valid in an integer constant expression}}
           ) : -1);
};




void test1(int n, int* p) { *(n ? p : (void *)(7-7)) = 1; }
void test2(int n, int* p) { *(n ? p : (void *)0) = 1; }



char array[1024/(sizeof (long))];

int x['\xBb' == (char) 187 ? 1: -1];

// PR1992
void func(int x)
{
  switch (x) {
    case sizeof("abc"): break;
    case sizeof("loooong"): func(4);
    case sizeof("\ploooong"): func(4);
  }
}


// rdar://4213768
int expr;
char y[__builtin_constant_p(expr) ? -1 : 1];
char z[__builtin_constant_p(4) ? 1 : -1];

// Comma tests
int comma1[0?1,2:3];  // expected-warning {{expression result unused}}
int comma2[1||(1,2)]; // expected-warning {{expression result unused}} \
                      // expected-warning {{use of logical '||' with constant operand}} \
                      // expected-note {{use '|' for a bitwise operation}}
int comma3[(1,2)]; // expected-warning {{size of static array must be an integer constant expression}} \
					// expected-warning {{expression result unused}}

// Pointer + __builtin_constant_p
char pbcp[__builtin_constant_p(4) ? (intptr_t)&expr : 0]; // expected-error {{variable length array declaration not allowed at file scope}}

int illegaldiv1a[1 || 1/0];  // expected-warning {{division by zero is undefined}}
int illegaldiv1b[1 && 1/0];  // expected-warning {{division by zero is undefined}} expected-error{{variable length array declaration not allowed at file scope}}

int illegaldiv2[1/0]; // expected-error {{variable length array declaration not allowed at file scope}} \
                      // expected-warning {{division by zero is undefined}}
int illegaldiv3[INT_MIN / -1]; // expected-error {{variable length array declaration not allowed at file scope}}
// PR9262
int illegaldiv4[0 / (1 / 0)]; // expected-warning {{division by zero is undefined}} expected-error {{variable length array declaration not allowed at file scope}}

int chooseexpr[__builtin_choose_expr(1, 1, expr)];
int realop[(__real__ 4) == 4 ? 1 : -1];
int imagop[(__imag__ 4) == 0 ? 1 : -1];