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enums and ints are compatible

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But like GCC do warn about changes in signedness.  The latter
leads to some changes in gen_assign_cast to not also warn about
  unsigned* = int*
(where GCC warns, but only with extra warnings).
This commit is contained in:
Michael Matz 2016-08-07 02:15:34 +02:00
parent b1a906b970
commit 34fc6435ee
4 changed files with 35 additions and 14 deletions
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3
tcc.h
View File

@ -387,7 +387,8 @@ struct Attribute {
mode : 4,
weak : 1,
visibility : 2,
fill : 8; // 8 bits left to fit well in union below
unsigned_enum : 1,
fill : 7; // 7 bits left to fit well in union below
};
/* GNUC attribute definition */

2
tccasm.c
View File

@ -612,7 +612,7 @@ static void asm_parse_directive(TCCState *s1)
case TOK_ASMDIR_global:
case TOK_ASMDIR_weak:
case TOK_ASMDIR_hidden:
tok1 = tok;
tok1 = tok;
do {
Sym *sym;

42
tccgen.c
View File

@ -2565,13 +2565,20 @@ static int compare_types(CType *type1, CType *type2, int unqualified)
t1 &= ~VT_DEFSIGN;
t2 &= ~VT_DEFSIGN;
}
/* An enum is compatible with (unsigned) int. Ideally we would
store the enums signedness in type->ref.a.<some_bit> and
only accept unsigned enums with unsigned int and vice versa.
But one of our callers (gen_assign_cast) always strips VT_UNSIGNED
from pointer target types, so we can't add it here either. */
if ((t1 & VT_BTYPE) == VT_ENUM) {
/* An enum is compatible with (unsigned) int. */
t1 = VT_INT | (t1 & ~VT_BTYPE);
t1 = VT_INT;
if (type1->ref->a.unsigned_enum)
t1 |= VT_UNSIGNED;
}
if ((t2 & VT_BTYPE) == VT_ENUM) {
/* An enum is compatible with (unsigned) int. */
t2 = VT_INT | (t2 & ~VT_BTYPE);
t2 = VT_INT;
if (type2->ref->a.unsigned_enum)
t2 |= VT_UNSIGNED;
}
/* XXX: bitfields ? */
if (t1 != t2)
@ -2766,15 +2773,23 @@ static void gen_assign_cast(CType *dt)
(type2->t & VT_BTYPE) == VT_VOID) {
/* void * can match anything */
} else {
/* exact type match, except for unsigned */
/* exact type match, except for qualifiers */
tmp_type1 = *type1;
tmp_type2 = *type2;
tmp_type1.t &= ~(VT_DEFSIGN | VT_UNSIGNED | VT_CONSTANT |
VT_VOLATILE);
tmp_type2.t &= ~(VT_DEFSIGN | VT_UNSIGNED | VT_CONSTANT |
VT_VOLATILE);
if (!is_compatible_types(&tmp_type1, &tmp_type2))
tcc_warning("assignment from incompatible pointer type");
tmp_type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
tmp_type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
if (!is_compatible_types(&tmp_type1, &tmp_type2)) {
/* Like GCC don't warn by default for merely changes
in pointer target signedness. Do warn for different
base types, though, in particular for unsigned enums
and signed int targets. */
if ((tmp_type1.t & (VT_DEFSIGN | VT_UNSIGNED)) !=
(tmp_type2.t & (VT_DEFSIGN | VT_UNSIGNED)) &&
(tmp_type1.t & VT_BTYPE) == (tmp_type2.t & VT_BTYPE))
;
else
tcc_warning("assignment from incompatible pointer type");
}
}
/* check const and volatile */
if ((!(type1->t & VT_CONSTANT) && (type2->t & VT_CONSTANT)) ||
@ -3252,6 +3267,7 @@ static void struct_decl(CType *type, AttributeDef *ad, int u)
c = 0;
/* non empty enums are not allowed */
if (a == TOK_ENUM) {
int seen_neg = 0;
for(;;) {
v = tok;
if (v < TOK_UIDENT)
@ -3265,6 +3281,8 @@ static void struct_decl(CType *type, AttributeDef *ad, int u)
next();
c = expr_const();
}
if (c < 0)
seen_neg = 1;
/* enum symbols have static storage */
ss = sym_push(v, &int_type, VT_CONST, c);
ss->type.t |= VT_STATIC;
@ -3276,6 +3294,8 @@ static void struct_decl(CType *type, AttributeDef *ad, int u)
if (tok == '}')
break;
}
if (!seen_neg)
s->a.unsigned_enum = 1;
s->c = type_size(&int_type, &align);
skip('}');
} else {

2
tests/tcctest.c
View File

@ -591,7 +591,7 @@ void enum_test()
{
enum test b1;
/* The following should give no warning */
int *p = &b1;
unsigned *p = &b1;
printf("enum:\n%d %d %d %d %d %d\n",
E0, E1, E2, E3, E4, E5);
b1 = 1;