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/* Test for diagnostics for constant overflow.  */

/* Origin: Joseph Myers <joseph@codesourcery.com> */

/* { dg-do compile } */

/* { dg-options "-std=c99" } */

#include <limits.h>

enum e {

  E0 = INT_MAX,

  /* Unsigned overflow wraps around.  */

  E1 = UINT_MAX + 1,

  /* Overflow in an unevaluated part of an expression is OK (example

     in the standard).  */

  E2 = 2 || 1 / 0,

  E3 = 1 / 0, /* { dg-warning "10:division by zero" } */

  /* { dg-error "3:enumerator value for 'E3' is not an integer constant" "enum error" { target *-*-* } 15 } */

  /* But as in DR#031, the 1/0 in an evaluated subexpression means the

     whole expression violates the constraints.  */

  E4 = 0 * (1 / 0), /* { dg-warning "15:division by zero" } */

  /* { dg-error "enumerator value for 'E4' is not an integer constant" "enum error" { target *-*-* } 19 } */

  E5 = INT_MAX + 1, /* { dg-warning "16:integer overflow in expression" } */

  /* Again, overflow in evaluated subexpression.  */

  E6 = 0 * (INT_MAX + 1), /* { dg-warning "21:integer overflow in expression" } */

  /* A cast does not constitute overflow in conversion.  */

  E7 = (char) INT_MAX

};

struct s {

  int a;

  int : 0 * (1 / 0); /* { dg-warning "16:division by zero" } */

  /* { dg-error "not an integer constant" "22:integer constant" { target *-*-* } 30 } */

  int : 0 * (INT_MAX + 1); /* { dg-warning "integer overflow in expression" } */

};

void

f (void)

{

  /* This expression is not required to be a constant expression, so

     it should just involve undefined behavior at runtime.  */

  int c = INT_MAX + 1; /* { dg-warning "19:integer overflow in expression" } */

}

/* But this expression does need to be constant.  */

static int sc = INT_MAX + 1; /* { dg-warning "25:integer overflow in expression" } */

/* The first two of these involve overflow, so are not null pointer

   constants.  The third has the overflow in an unevaluated

   subexpression, so is a null pointer constant.  */

void *p = 0 * (INT_MAX + 1); /* { dg-warning "integer overflow in expression" } */

/* { dg-warning "initialization makes pointer from integer without a cast" "null" { target *-*-* } 49 } */

void *q = 0 * (1 / 0); /* { dg-warning "division by zero" } */

/* { dg-error "initializer element is not computable at load time" "constant" { target *-*-* } 51 } */

/* { dg-warning "initialization makes pointer from integer without a cast" "null" { target *-*-* } 51 } */

void *r = (1 ? 0 : INT_MAX+1);

void

g (int i)

{

  switch (i)

    {

    case 0 * (1/0): /* { dg-warning "division by zero" } */

      /* { dg-error "case label does not reduce to an integer constant" "constant" { target *-*-* } 61 } */

      ;

    case 1 + 0 * (INT_MAX + 1): /* { dg-warning "integer overflow in expression" } */

      ;

    }

}

int

h (void)

{

  return INT_MAX + 1; /* { dg-warning "integer overflow in expression" } */

}

int

h1 (void)

{

  return INT_MAX + 1 - INT_MAX; /* { dg-warning "integer overflow in expression" } */

}

void fuc (unsigned char);

void fsc (signed char);

void

h2 (void)

{

  fsc (SCHAR_MAX + 1);

  fsc (SCHAR_MIN - 1); /* { dg-warning "overflow in implicit constant conversion" } */

  fsc (UCHAR_MAX);

  fsc (UCHAR_MAX + 1); /* { dg-warning "overflow in implicit constant conversion" } */

  fuc (-1);

  fuc (UCHAR_MAX + 1); /* { dg-warning "large integer implicitly truncated to unsigned type" } */

  fuc (SCHAR_MIN);

  fuc (SCHAR_MIN - 1); /* { dg-warning "large integer implicitly truncated to unsigned type" } */

  fuc (-UCHAR_MAX); /* { dg-warning "large integer implicitly truncated to unsigned type" } */

}

void fui (unsigned int);

void fsi (signed int);

int si;

unsigned ui;

void

h2i (int x)

{

  /* For some reason, we only give certain warnings for implicit

     conversions among values of the same precision with -Wconversion,

     while we don't give others at all.  */

  fsi ((unsigned)INT_MAX + 1);

  si = (unsigned)INT_MAX + 1;

  si = x ? (unsigned)INT_MAX + 1 : 1;

  fsi ((unsigned)INT_MAX + 2);

  si = (unsigned)INT_MAX + 2;

  si = x ? (unsigned)INT_MAX + 2 : 1;

  fsi (UINT_MAX);

  si = UINT_MAX;

  fui (-1);

  ui = -1;

  ui = x ? -1 : 1U;

  fui (INT_MIN);

  ui = INT_MIN;

  ui = x ? INT_MIN : 1U;

}