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

   1 // RUN: %clang_cc1 %s -ffreestanding -Wno-int-to-pointer-cast -fsyntax-only -verify -pedantic -fpascal-strings -std=c99
   2
   3 #include <stdint.h>
   4 #include <limits.h>
   5
   6 int a(void) {int p; *(1 ? &p : (void*)(0 && (a(),1))) = 10;} // expected-error {{incomplete type 'void' is not assignable}}
   7
   8 // rdar://6091492 - ?: with __builtin_constant_p as the operand is an i-c-e.
   9 int expr;
  10 char w[__builtin_constant_p(expr) ? expr : 1];
  11
  12 char v[sizeof(__builtin_constant_p(0)) == sizeof(int) ? 1 : -1];
  13
  14 int implicitConversion = 1.0;
  15 char floatArith[(int)(1.0+2.0)]; // expected-warning {{variable length array folded to constant array as an extension}}
  16
  17 // __builtin_constant_p as the condition of ?: allows arbitrary foldable
  18 // constants to be transmogrified into i-c-e's.
  19 char b[__builtin_constant_p((int)(1.0+2.0)) ? (int)(1.0+2.0) : -1];
  20
  21 struct c {
  22   int a : (
  23            __builtin_constant_p((int)(1.0+2.0)) ? (int)(1.0+
  24      expr // expected-error {{expression is not an integer constant expression}}
  25            ) : -1);
  26 };
  27
  28 // Check that we can evaluate statement-expressions properly when
  29 // constant-folding inside an ICE.
  30 void PR49239(void) {
  31   goto check_not_vla;
  32   char not_vla[__builtin_constant_p(1) ? ({ 42; }) : -1]; // expected-warning {{statement expression}}
  33 check_not_vla:;
  34   _Static_assert(sizeof(not_vla) == 42, ""); // expected-warning {{C11 extension}}
  35
  36   // It's not clear that this should be valid: __builtin_expect(expr1, expr2)
  37   // should probably be an ICE if and only if expr1 is an ICE, but we roughly
  38   // follow GCC in treating it as an ICE if and only if we can evaluate expr1
  39   // regardless of whether it's an ICE.
  40   goto check_also_not_vla;
  41   char also_not_vla[__builtin_expect(({ 76; }), 0)]; // expected-warning {{statement expression}}
  42 check_also_not_vla:;
  43   _Static_assert(sizeof(also_not_vla) == 76, ""); // expected-warning {{C11 extension}}
  44 }
  45
  46
  47 void test1(int n, int* p) { *(n ? p : (void *)(7-7)) = 1; }
  48 void test2(int n, int* p) { *(n ? p : (void *)0) = 1; }
  49
  50
  51
  52 char array[1024/(sizeof (long))];
  53
  54 int x['\xBb' == (char) 187 ? 1: -1];
  55
  56 // PR1992
  57 void func(int x)
  58 {
  59   switch (x) {
  60     case sizeof("abc"): break;
  61     case sizeof("loooong"): func(4);
  62     case sizeof("\ploooong"): func(4);
  63   }
  64 }
  65
  66
  67 // rdar://4213768
  68 int expr;
  69 char y[__builtin_constant_p(expr) ? -1 : 1];
  70 char z[__builtin_constant_p(4) ? 1 : -1];
  71
  72 // Comma tests
  73 int comma1[0?1,2:3]; // expected-warning {{left operand of comma operator has no effect}}
  74 int comma2[1 || (1, 2)]; // expected-warning {{use of logical '||' with constant operand}} \
  75                       // expected-note {{use '|' for a bitwise operation}} \
  76                       // expected-warning {{left operand of comma operator has no effect}}
  77 int comma3[(1, 2)];   // expected-warning {{variable length array folded to constant array as an extension}} \
  78                       // expected-warning {{left operand of comma operator has no effect}}
  79
  80 // Pointer + __builtin_constant_p
  81 char pbcp[__builtin_constant_p(4) ? (intptr_t)&expr : 0]; // expected-error {{variable length array declaration not allowed at file scope}}
  82
  83 int illegaldiv1a[1 || 1/0];
  84 int illegaldiv1b[1 && 1/0];  //expected-error{{variable length array declaration not allowed at file scope}}
  85
  86 int illegaldiv2[1/0]; // expected-error {{variable length array declaration not allowed at file scope}}
  87 int illegaldiv3[INT_MIN / -1]; // expected-error {{variable length array declaration not allowed at file scope}}
  88 // PR9262
  89 int illegaldiv4[0 / (1 / 0)]; // expected-error {{variable length array declaration not allowed at file scope}}
  90
  91 int chooseexpr[__builtin_choose_expr(1, 1, expr)];
  92 int realop[(__real__ 4) == 4 ? 1 : -1];
  93 int imagop[(__imag__ 4) == 0 ? 1 : -1];
  94
  95 int *PR14729 = 0 ?: 1/0; // expected-error {{not a compile-time constant}} expected-warning 3{{}}
  96
  97 int bcp_call_v;
  98 int bcp_call_a[] = {__builtin_constant_p(bcp_call_v && 0) ? bcp_call_v && 0 : -1};