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add C11's _Generic

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Simple implementation, I'm not even sure to respect C standart here,
but it should work with most use case.

This add an case in unary(), and generate TokString depending of _Generic
controlling exression, use begin_macro to "push"
the generated TokString, then call unary() again before exiting the switch
so the just add token are reevaluate again.
This commit is contained in:
Matthias Gatto 2016-12-09 11:42:41 +01:00
parent 9ed8b54f6c
commit 157bad52cd
2 changed files with 74 additions and 1 deletions
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71
tccgen.c
View File

@ -92,6 +92,7 @@ ST_FUNC void vpush(CType *type);
ST_FUNC int gvtst(int inv, int t);
ST_FUNC int is_btype_size(int bt);
static void gen_inline_functions(TCCState *s);
static void skip_or_save_block(TokenString **str);
ST_INLN int is_float(int t)
{
@ -4689,6 +4690,76 @@ ST_FUNC void unary(void)
next();
break;
case TOK_GENERIC:
{
CType controlling_type;
int has_default = 0;
int has_match = 0;
CType cur_type;
AttributeDef ad_tmp;
int learn = 0;
TokenString *str = NULL;
ParseState saved_parse_state;
next();
skip('(');
expr_type(&controlling_type, 1);
if (controlling_type.t & VT_ARRAY)
controlling_type.t = VT_PTR;
controlling_type.t &= ~VT_CONSTANT;
for (;;) {
learn = 0;
skip(',');
if (tok == TOK_DEFAULT) {
if (has_default)
tcc_error("too many 'default'");
if (!has_match) {
has_default = 1;
learn = 1;
}
next();
} else {
int itmp;
parse_btype(&cur_type, &ad_tmp);
type_decl(&cur_type, &ad_tmp, &itmp, TYPE_ABSTRACT);
if (compare_types(&controlling_type, &cur_type, 0)) {
if (has_match) {
tcc_error("type march twice");
}
if (has_default)
tok_str_free(str);
has_match = 1;
learn = 1;
}
}
skip(':');
if (learn) {
skip_or_save_block(&str);
} else {
skip_or_save_block(NULL);
}
if (tok == ',')
continue;
else if (tok == ')')
break;
}
if (!has_match && !has_default) {
char buf[256];
type_to_str(buf, 256, &controlling_type, NULL);
tcc_error("_Generic sellector of type '%s' is not compatible with any assosiation",
buf);
}
skip(')');
save_parse_state(&saved_parse_state);
begin_macro(str, 1);
next();
expr_eq();
end_macro();
restore_parse_state(&saved_parse_state);
break;
}
// special qnan , snan and infinity values
case TOK___NAN__:
vpush64(VT_DOUBLE, 0x7ff8000000000000ULL);

4
tcctok.h
View File

@ -36,7 +36,9 @@
DEF(TOK_RESTRICT2, "__restrict")
DEF(TOK_RESTRICT3, "__restrict__")
DEF(TOK_EXTENSION, "__extension__") /* gcc keyword */
DEF(TOK_GENERIC, "_Generic")
DEF(TOK_FLOAT, "float")
DEF(TOK_DOUBLE, "double")
DEF(TOK_BOOL, "_Bool")