/* Test for diagnostics for constant overflow. Test with -pedantic-errors. */
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/* Test for diagnostics for constant overflow. Test with -pedantic-errors. */
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/* Origin: Joseph Myers <joseph@codesourcery.com> */
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/* Origin: Joseph Myers <joseph@codesourcery.com> */
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/* { dg-do compile } */
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/* { dg-do compile } */
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/* { dg-options "-std=c99 -pedantic-errors" } */
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/* { dg-options "-std=c99 -pedantic-errors" } */
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#include <limits.h>
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#include <limits.h>
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enum e {
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enum e {
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E0 = INT_MAX,
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E0 = INT_MAX,
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/* Unsigned overflow wraps around. */
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/* Unsigned overflow wraps around. */
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E1 = UINT_MAX + 1,
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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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/* Overflow in an unevaluated part of an expression is OK (example
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in the standard). */
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in the standard). */
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E2 = 2 || 1 / 0,
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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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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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/* { 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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/* 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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whole expression violates the constraints. */
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E4 = 0 * (1 / 0), /* { dg-warning "warning: division by zero" } */
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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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/* { 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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E5 = INT_MAX + 1, /* { dg-warning "warning: integer overflow in expression" } */
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/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 21 } */
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/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 21 } */
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/* Again, overflow in evaluated subexpression. */
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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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E6 = 0 * (INT_MAX + 1), /* { dg-warning "warning: integer overflow in expression" } */
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/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 24 } */
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/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 24 } */
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/* A cast does not constitute overflow in conversion. */
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/* A cast does not constitute overflow in conversion. */
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E7 = (char) INT_MAX
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E7 = (char) INT_MAX
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};
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};
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struct s {
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struct s {
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int a;
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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 * (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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int : 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */
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/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 33 } */
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/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 33 } */
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};
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};
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void
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void
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f (void)
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f (void)
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{
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{
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/* This expression is not required to be a constant expression, so
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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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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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int c = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
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/* { dg-bogus "error: overflow in constant expression" "constant" { xfail *-*-* } 42 } */
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/* { dg-bogus "error: overflow in constant expression" "constant" { xfail *-*-* } 42 } */
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}
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}
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/* But this expression does need to be constant. */
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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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static int sc = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
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/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 47 } */
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/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 47 } */
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/* The first two of these involve overflow, so are not null pointer
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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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constants. The third has the overflow in an unevaluated
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subexpression, so is a null pointer constant. */
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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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void *p = 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */
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/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 53 } */
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/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 53 } */
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/* { dg-error "error: initialization makes pointer from integer without a cast" "null" { target *-*-* } 53 } */
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/* { dg-error "error: initialization makes pointer from integer without a cast" "null" { target *-*-* } 53 } */
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void *q = 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */
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void *q = 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */
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/* { dg-error "error: initialization makes pointer from integer without a cast" "null" { xfail *-*-* } 56 } */
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/* { dg-error "error: initialization makes pointer from integer without a cast" "null" { xfail *-*-* } 56 } */
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void *r = (1 ? 0 : INT_MAX+1);
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void *r = (1 ? 0 : INT_MAX+1);
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void
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void
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g (int i)
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g (int i)
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{
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{
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switch (i)
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switch (i)
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{
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{
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case 0 * (1/0): /* { dg-warning "warning: division by zero" } */
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case 0 * (1/0): /* { dg-warning "warning: division by zero" } */
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;
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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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case 1 + 0 * (INT_MAX + 1): /* { dg-warning "warning: integer overflow in expression" } */
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/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 67 } */
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/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 67 } */
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;
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;
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}
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}
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}
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}
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int
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int
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h (void)
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h (void)
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{
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{
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return INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
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return INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
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}
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}
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int
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int
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h1 (void)
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h1 (void)
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{
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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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return INT_MAX + 1 - INT_MAX; /* { dg-warning "warning: integer overflow in expression" } */
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}
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}
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void fuc (unsigned char);
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void fuc (unsigned char);
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void fsc (signed char);
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void fsc (signed char);
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void
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void
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h2 (void)
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h2 (void)
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{
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{
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fsc (SCHAR_MAX + 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
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fsc (SCHAR_MAX + 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
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fsc (SCHAR_MIN - 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
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fsc (SCHAR_MIN - 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
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fsc (UCHAR_MAX); /* { dg-warning "warning: overflow in implicit constant conversion" } */
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fsc (UCHAR_MAX); /* { dg-warning "warning: overflow in implicit constant conversion" } */
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fsc (UCHAR_MAX + 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
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fsc (UCHAR_MAX + 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
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fuc (-1);
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fuc (-1);
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fuc (UCHAR_MAX + 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
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fuc (UCHAR_MAX + 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
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fuc (SCHAR_MIN);
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fuc (SCHAR_MIN);
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fuc (SCHAR_MIN - 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
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fuc (SCHAR_MIN - 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
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fuc (-UCHAR_MAX); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
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fuc (-UCHAR_MAX); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
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}
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}
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void fui (unsigned int);
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void fui (unsigned int);
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void fsi (signed int);
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void fsi (signed int);
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int si;
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int si;
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unsigned ui;
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unsigned ui;
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void
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void
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h2i (int x)
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h2i (int x)
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{
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{
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/* For some reason, we only give certain warnings for implicit
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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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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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while we don't give others at all. */
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fsi ((unsigned)INT_MAX + 1);
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fsi ((unsigned)INT_MAX + 1);
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si = (unsigned)INT_MAX + 1;
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si = (unsigned)INT_MAX + 1;
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si = x ? (unsigned)INT_MAX + 1 : 1;
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si = x ? (unsigned)INT_MAX + 1 : 1;
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fsi ((unsigned)INT_MAX + 2);
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fsi ((unsigned)INT_MAX + 2);
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si = (unsigned)INT_MAX + 2;
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si = (unsigned)INT_MAX + 2;
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si = x ? (unsigned)INT_MAX + 2 : 1;
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si = x ? (unsigned)INT_MAX + 2 : 1;
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fsi (UINT_MAX);
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fsi (UINT_MAX);
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si = UINT_MAX;
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si = UINT_MAX;
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fui (-1);
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fui (-1);
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ui = -1;
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ui = -1;
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ui = x ? -1 : 1U;
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ui = x ? -1 : 1U;
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fui (INT_MIN);
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fui (INT_MIN);
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ui = INT_MIN;
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ui = INT_MIN;
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ui = x ? INT_MIN : 1U;
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ui = x ? INT_MIN : 1U;
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}
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}
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