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v0_8-add min_typ_max to expressions. 

This patch adds min_typ_max to expressions. Remember when using a
min_typ_max triplet in an expression they must be enclosed with
parenthesis (1364-2001 section 4.3 page 58).
This commit is contained in:
Cary R 2007-10-25 10:17:17 -07:00 committed by Stephen Williams
parent c67f3b0081
commit 40e09cd719
1 changed files with 26 additions and 2 deletions
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28
parse.y
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@ -191,7 +191,7 @@ const static struct str_pair_t str_strength = { PGate::STRONG, PGate::STRONG };
%type <gate> gate_instance
%type <gates> gate_instance_list
%type <expr> expression expr_primary
%type <expr> expression expr_primary expr_mintypmax
%type <expr> lavalue lpvalue
%type <expr> delay_value delay_value_simple
%type <exprs> delay1 delay3 delay3_opt
@ -877,6 +877,30 @@ expression
}
;
expr_mintypmax
: expression
{ $$ = $1; }
| expression ':' expression ':' expression
{ switch (min_typ_max_flag) {
case MIN:
$$ = $1;
delete $3;
delete $5;
break;
case TYP:
delete $1;
$$ = $3;
delete $5;
break;
case MAX:
delete $1;
delete $3;
$$ = $5;
break;
}
}
;
/* Many contexts take a comma separated list of expressions. Null
expressions can happen anywhere in the list, so there are two
@ -970,7 +994,7 @@ expr_primary
tmp->set_lineno(@1.first_line);
$$ = tmp;
}
| '(' expression ')'
| '(' expr_mintypmax ')'
{ $$ = $2; }
| '{' expression_list '}'
{ PEConcat*tmp = new PEConcat(*$2);