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Backport Nexus::has_floating_input() from master branch. 

Needed to support check for output port coercion.
This commit is contained in:
Martin Whitaker 2016-09-17 19:40:05 +01:00
parent e7852f8f9c
commit a11dc8b472
2 changed files with 18 additions and 0 deletions
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14
net_link.cc
View File

@ -311,6 +311,20 @@ void Nexus::count_io(unsigned&inp, unsigned&out) const
} }
} }
bool Nexus::has_floating_input() const
{
bool found_input = false;
for (const Link*cur = first_nlink() ; cur ; cur = cur->next_nlink()) {
if (cur->get_dir() == Link::OUTPUT)
return false;
if (cur->get_dir() == Link::INPUT)
found_input = true;
}
return found_input;
}
bool Nexus::drivers_present() const bool Nexus::drivers_present() const
{ {
for (const Link*cur = first_nlink() ; cur ; cur = cur->next_nlink()) { for (const Link*cur = first_nlink() ; cur ; cur = cur->next_nlink()) {

4
netlist.h
View File

@ -388,6 +388,10 @@ class Nexus {
is a variable, but also if this is a net with a force. */ is a variable, but also if this is a net with a force. */
bool assign_lval() const; bool assign_lval() const;
/* This method returns true if there are any inputs
attached to this nexus but no drivers. */
bool has_floating_input() const;
/* This method returns true if there are any drivers /* This method returns true if there are any drivers
(including variables) attached to this nexus. */ (including variables) attached to this nexus. */
bool drivers_present() const; bool drivers_present() const;