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Don't crash if parameter/localparam defined from constant user function. 

This patch avoids a crash when trying to use a parameter/localparam that
has been assigned a value from a constant user function. Icarus does not
currently support constant user functions so it creates a parameter with
a NULL value. This patch fixes a few places where this could crash the
compiler.
(cherry picked from commit 3f203c4363)
This commit is contained in:
Cary R 2010-06-07 13:52:19 -07:00 committed by Stephen Williams
parent 597c3da220
commit e11f4cf69e
2 changed files with 10 additions and 2 deletions
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2
elab_pexpr.cc
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@ -508,7 +508,7 @@ void NetEParam::resolve_pexpr_type(void)
if (reference_->second.signed_flag) {
cast_signed_base_(true);
} else {
} else if (reference_->second.expr) {
cast_signed_base_( reference_->second.expr->has_sign() );
}
}

10
eval_tree.cc
View File

@ -1231,7 +1231,15 @@ NetExpr* NetEParam::eval_tree(int prune_to_width)
assert(scope_);
perm_string name = (*reference_).first;
const NetExpr*expr = (*reference_).second.expr;
ivl_assert(*this, expr);
// Since constant user functions are not supported we can get
// parameters/localparams that are not defined. For now generate
// an appropriate error message.
if (expr == NULL) {
cerr << get_fileline() << ": internal error: parameter/localparam "
<< *this << " cannot be evaluated." << endl;
return 0;
}
// ivl_assert(*this, expr);
NetExpr*nexpr = expr->dup_expr();
assert(nexpr);