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C11 conformance: Add _Noreturn, stdnoreturn.h, and partial _Alignas support

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_Noreturn, just like __attribute__((noreturn)), is ignored.
I also added stdnoreturn.h, in all its glorious uselessness.

_Alignas only works for integer expressions right now. In order
to comply, we need:
 - _Alignas(type) -> _Alignas(_Alignof(type)).
 - stdalign.h as soon as it is done.

Note: DR 444 is supported; it works on struct members.

Signed-off-by: Devin Hussey <husseydevin@gmail.com>
This commit is contained in:
Devin Hussey 2019-03-20 15:03:27 -04:00
parent 1fd3709379
commit 9382a3ad58
3 changed files with 46 additions and 1 deletions
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7
include/stdnoreturn.h Normal file
View File

@ -0,0 +1,7 @@
#ifndef _STDNORETURN_H
#define _STDNORETURN_H
/* ISOC11 noreturn */
#define noreturn _Noreturn
#endif /* _STDNORETURN_H */

38
tccgen.c
View File

@ -4172,6 +4172,22 @@ static int parse_btype(CType *type, AttributeDef *ad)
case TOK_INT:
u = VT_INT;
goto basic_type;
case TOK_ALIGNAS:
{ int n;
next();
/* TODO: _Alignas(type) -> _Alignas(_Alignof(type)) */
if (tok == '(') {
next();
n = expr_const();
if (n <= 0 || (n & (n - 1)) != 0)
tcc_error("alignment must be a positive power of two");
skip(')');
} else {
expect("(");
}
ad->a.aligned = exact_log2p1(n);
}
continue;
case TOK_LONG:
if ((t & VT_BTYPE) == VT_DOUBLE) {
t = (t & ~(VT_BTYPE|VT_LONG)) | VT_LDOUBLE;
@ -4281,7 +4297,11 @@ static int parse_btype(CType *type, AttributeDef *ad)
t |= VT_INLINE;
next();
break;
case TOK_NORETURN3:
/* currently, no need to handle it because tcc does not
track unused objects */
next();
break;
/* GNUC attribute */
case TOK_ATTRIBUTE1:
case TOK_ATTRIBUTE2:
@ -4569,6 +4589,22 @@ static CType *type_decl(CType *type, AttributeDef *ad, int *v, int td)
case TOK_RESTRICT2:
case TOK_RESTRICT3:
goto redo;
case TOK_ALIGNAS:
{ int n;
next();
/* TODO: _Alignas(type) -> _Alignas(_Alignof(type)) */
if (tok == '(') {
next();
n = expr_const();
if (n <= 0 || (n & (n - 1)) != 0)
tcc_error("alignment must be a positive power of two");
skip(')');
} else {
expect("(");
}
ad->a.aligned = exact_log2p1(n);
}
break;
/* XXX: clarify attribute handling */
case TOK_ATTRIBUTE1:
case TOK_ATTRIBUTE2:

2
tcctok.h
View File

@ -54,6 +54,7 @@
DEF(TOK_ALIGNOF1, "__alignof")
DEF(TOK_ALIGNOF2, "__alignof__")
DEF(TOK_ALIGNOF3, "_Alignof")
DEF(TOK_ALIGNAS, "_Alignas")
DEF(TOK_TYPEOF1, "typeof")
DEF(TOK_TYPEOF2, "__typeof")
DEF(TOK_TYPEOF3, "__typeof__")
@ -138,6 +139,7 @@
DEF(TOK_NODECORATE, "nodecorate")
DEF(TOK_NORETURN1, "noreturn")
DEF(TOK_NORETURN2, "__noreturn__")
DEF(TOK_NORETURN3, "_Noreturn")
DEF(TOK_VISIBILITY1, "visibility")
DEF(TOK_VISIBILITY2, "__visibility__")