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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [gcc/] [testsuite/] [gcc.dg/] [overflow-warn-2.c] - Blame information for rev 853

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1 149 jeremybenn 
/* Test for diagnostics for constant overflow.  Test with -Wconversion.  */
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/* Origin: Joseph Myers <joseph@codesourcery.com> */
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/* { dg-do compile } */
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/* { dg-options "-std=c99 -Wconversion" } */
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#include <limits.h>
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enum e {
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  E0 = INT_MAX,
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  /* Unsigned overflow wraps around.  */
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  E1 = UINT_MAX + 1,
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  /* Overflow in an unevaluated part of an expression is OK (example
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     in the standard).  */
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  E2 = 2 || 1 / 0,
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  E3 = 1 / 0, /* { dg-warning "warning: division by zero" } */
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  /* { dg-error "error: enumerator value for 'E3' is not an integer constant" "enum error" { target *-*-* } 15 } */
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  /* But as in DR#031, the 1/0 in an evaluated subexpression means the
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     whole expression violates the constraints.  */
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  E4 = 0 * (1 / 0), /* { dg-warning "warning: division by zero" } */
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  /* { dg-error "error: enumerator value for 'E4' is not an integer constant" "enum error" { xfail *-*-* } 19 } */
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  E5 = INT_MAX + 1, /* { dg-warning "warning: integer overflow in expression" } */
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  /* Again, overflow in evaluated subexpression.  */
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  E6 = 0 * (INT_MAX + 1), /* { dg-warning "warning: integer overflow in expression" } */
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  /* A cast does not constitute overflow in conversion.  */
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  E7 = (char) INT_MAX
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};
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struct s {
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  int a;
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  int : 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */
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  int : 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */
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};
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void
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f (void)
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{
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  /* This expression is not required to be a constant expression, so
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     it should just involve undefined behavior at runtime.  */
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  int c = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
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}
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/* But this expression does need to be constant.  */
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static int sc = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
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/* The first two of these involve overflow, so are not null pointer
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   constants.  The third has the overflow in an unevaluated
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   subexpression, so is a null pointer constant.  */
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void *p = 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */
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/* { dg-warning "warning: initialization makes pointer from integer without a cast" "null" { target *-*-* } 48 } */
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void *q = 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */
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/* { dg-warning "warning: initialization makes pointer from integer without a cast" "null" { xfail *-*-* } 50 } */
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void *r = (1 ? 0 : INT_MAX+1);
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void
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g (int i)
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{
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  switch (i)
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    {
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    case 0 * (1/0): /* { dg-warning "warning: division by zero" } */
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      ;
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    case 1 + 0 * (INT_MAX + 1): /* { dg-warning "warning: integer overflow in expression" } */
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      ;
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    }
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}
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int
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h (void)
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{
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  return INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
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}
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int
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h1 (void)
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{
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  return INT_MAX + 1 - INT_MAX; /* { dg-warning "warning: integer overflow in expression" } */
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}
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void fuc (unsigned char);
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void fsc (signed char);
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void
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h2 (void)
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{
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  fsc (SCHAR_MAX + 1);
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  /* { dg-warning "warning: passing argument 1 of 'fsc' with different width due to prototype" "-Wconversion" { target *-*-* } 84 } */
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  fsc (SCHAR_MIN - 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
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  /* { dg-warning "warning: passing argument 1 of 'fsc' with different width due to prototype" "-Wconversion" { target *-*-* } 86 } */
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  fsc (UCHAR_MAX);
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  /* { dg-warning "warning: passing argument 1 of 'fsc' with different width due to prototype" "-Wconversion" { target *-*-* } 88 } */
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  fsc (UCHAR_MAX + 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
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  /* { dg-warning "warning: passing argument 1 of 'fsc' with different width due to prototype" "-Wconversion" { target *-*-* } 90 } */
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  fuc (-1); /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
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  /* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 92 } */
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  fuc (UCHAR_MAX + 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
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  /* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 94 } */
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  fuc (SCHAR_MIN); /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
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  /* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 96 } */
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  fuc (SCHAR_MIN - 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
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  /* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 98 } */
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  fuc (-UCHAR_MAX); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
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  /* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 100 } */
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}
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void fui (unsigned int);
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void fsi (signed int);
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int si;
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unsigned ui;
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void
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h2i (int x)
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{
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  /* For some reason, we only give certain warnings for implicit
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     conversions among values of the same precision with -Wconversion,
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     while we don't give others at all.  */
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  fsi ((unsigned)INT_MAX + 1); /* { dg-warning "warning: passing argument 1 of 'fsi' as signed due to prototype" } */
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  si = (unsigned)INT_MAX + 1;
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  si = x ? (unsigned)INT_MAX + 1 : 1;
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  fsi ((unsigned)INT_MAX + 2); /* { dg-warning "warning: passing argument 1 of 'fsi' as signed due to prototype" } */
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  si = (unsigned)INT_MAX + 2;
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  si = x ? (unsigned)INT_MAX + 2 : 1;
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  fsi (UINT_MAX); /* { dg-warning "warning: passing argument 1 of 'fsi' as signed due to prototype" } */
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  si = UINT_MAX;
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  fui (-1); /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
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  /* { dg-warning "warning: passing argument 1 of 'fui' as unsigned due to prototype" "-Wconversion" { target *-*-* } 124 } */
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  ui = -1; /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
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  ui = x ? -1 : 1U; /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
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  fui (INT_MIN); /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
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  /* { dg-warning "warning: passing argument 1 of 'fui' as unsigned due to prototype" "-Wconversion" { target *-*-* } 128 } */
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  ui = INT_MIN; /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
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  ui = x ? INT_MIN : 1U; /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
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}

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