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Add support for exclude of a point 

Parameter value ranges support the exclude of a point as well as
range, so add the syntax to support that case. Internally it is
handled as a degenerate range, but the parse and initial elaboration
need to know about it.
This commit is contained in:
Stephen Williams 2008-06-05 21:49:49 -07:00
parent 30570adf31
commit 2576543bb5
2 changed files with 17 additions and 2 deletions
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11
elab_scope.cc
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@ -98,7 +98,16 @@ void Module::elaborate_parm_item_(perm_string name, const param_expr_t&cur,
tmp->low_expr = 0;
}
if (range->high_expr) {
if (range->high_expr && range->high_expr==range->low_expr) {
// Detect the special case of a "point"
// range. These are called out by setting the high
// and low expression ranges to the same
// expression. The exclude_flags should be false
// in this case
ivl_assert(*range->high_expr, tmp->low_open_flag==false && tmp->high_open_flag==false);
tmp->high_expr = tmp->low_expr;
} else if (range->high_expr) {
tmp->high_expr = elab_and_eval(des, scope, range->high_expr, -1);
ivl_assert(*range->high_expr, tmp->high_expr);
} else {

8
parse.y
View File

@ -323,10 +323,15 @@ static PECallFunction*make_call_function(perm_string tn, PExpr*arg1, PExpr*arg2)
%left K_POW
%left UNARY_PREC
/* to resolve dangling else ambiguity. */
%nonassoc less_than_K_else
%nonassoc K_else
/* to resolve exclude (... ambiguity */
%nonassoc '('
%nonassoc K_exclude
%%
/* A degenerate source file can be completely empty. */
@ -2432,7 +2437,8 @@ parameter_value_range
{ $$ = pform_parameter_value_range($1, true, $3, false, $5); }
| from_exclude '(' value_range_expression ':' value_range_expression ')'
{ $$ = pform_parameter_value_range($1, true, $3, true, $5); }
/* | K_exclude expression */
| K_exclude expression
{ $$ = pform_parameter_value_range(true, false, $2, false, $2); }
;
value_range_expression