/* Test for diagnostics for constant overflow.  Test with -Wconversion.  *//* Origin: Joseph Myers <joseph@codesourcery.com> *//* { dg-do compile } *//* { dg-options "-std=c99 -Wconversion" } */#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 "warning: division by zero" } */  /* { dg-error "error: 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 "warning: division by zero" } */  /* { dg-error "error: enumerator value for 'E4' is not an integer constant" "enum error" { xfail *-*-* } 19 } */  E5 = INT_MAX + 1, /* { dg-warning "warning: integer overflow in expression" } */  /* Again, overflow in evaluated subexpression.  */  E6 = 0 * (INT_MAX + 1), /* { dg-warning "warning: 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 "warning: division by zero" } */  int : 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */};voidf (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 "warning: integer overflow in expression" } */}/* But this expression does need to be constant.  */static int sc = INT_MAX + 1; /* { dg-warning "warning: 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 "warning: integer overflow in expression" } *//* { dg-warning "warning: initialization makes pointer from integer without a cast" "null" { target *-*-* } 48 } */void *q = 0 * (1 / 0); /* { dg-warning "warning: division by zero" } *//* { dg-warning "warning: initialization makes pointer from integer without a cast" "null" { xfail *-*-* } 50 } */void *r = (1 ? 0 : INT_MAX+1);voidg (int i){  switch (i)    {    case 0 * (1/0): /* { dg-warning "warning: division by zero" } */      ;    case 1 + 0 * (INT_MAX + 1): /* { dg-warning "warning: integer overflow in expression" } */      ;    }}inth (void){  return INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */}inth1 (void){  return INT_MAX + 1 - INT_MAX; /* { dg-warning "warning: integer overflow in expression" } */}void fuc (unsigned char);void fsc (signed char);voidh2 (void){  fsc (SCHAR_MAX + 1);  /* { dg-warning "warning: passing argument 1 of 'fsc' with different width due to prototype" "-Wconversion" { target *-*-* } 84 } */  fsc (SCHAR_MIN - 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */  /* { dg-warning "warning: passing argument 1 of 'fsc' with different width due to prototype" "-Wconversion" { target *-*-* } 86 } */  fsc (UCHAR_MAX);  /* { dg-warning "warning: passing argument 1 of 'fsc' with different width due to prototype" "-Wconversion" { target *-*-* } 88 } */  fsc (UCHAR_MAX + 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */  /* { dg-warning "warning: passing argument 1 of 'fsc' with different width due to prototype" "-Wconversion" { target *-*-* } 90 } */  fuc (-1); /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */  /* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 92 } */  fuc (UCHAR_MAX + 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */  /* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 94 } */  fuc (SCHAR_MIN); /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */  /* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 96 } */  fuc (SCHAR_MIN - 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */  /* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 98 } */  fuc (-UCHAR_MAX); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */  /* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 100 } */}void fui (unsigned int);void fsi (signed int);int si;unsigned ui;voidh2i (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); /* { dg-warning "warning: passing argument 1 of 'fsi' as signed due to prototype" } */  si = (unsigned)INT_MAX + 1;  si = x ? (unsigned)INT_MAX + 1 : 1;  fsi ((unsigned)INT_MAX + 2); /* { dg-warning "warning: passing argument 1 of 'fsi' as signed due to prototype" } */  si = (unsigned)INT_MAX + 2;  si = x ? (unsigned)INT_MAX + 2 : 1;  fsi (UINT_MAX); /* { dg-warning "warning: passing argument 1 of 'fsi' as signed due to prototype" } */  si = UINT_MAX;  fui (-1); /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */  /* { dg-warning "warning: passing argument 1 of 'fui' as unsigned due to prototype" "-Wconversion" { target *-*-* } 124 } */  ui = -1; /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */  ui = x ? -1 : 1U; /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */  fui (INT_MIN); /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */  /* { dg-warning "warning: passing argument 1 of 'fui' as unsigned due to prototype" "-Wconversion" { target *-*-* } 128 } */  ui = INT_MIN; /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */  ui = x ? INT_MIN : 1U; /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */}