SystemVerilog allows tasks, functions, and classes to be defined at the
root level or inside packages, so we can't rely on an enclosing module
being present to provide the timescale.
(cherry picked from commit 7bed181f68)
If a static variable declared in a task, function, or block has an
initialisation expression, SystemVerilog requires the declaration to
have an explicit static lifetime. This is supposed to be a compile
error, but for now just output a warning.
Implementing this required adding support in the parser for explicit
lifetimes in variable declarations. For now, just output an error if
the user asks for a lifetime that isn't the default for that scope.
(cherry picked from commit 9538c81d34)
Class methods belong in a class scope, not the containing module.
So create a lexical scope that carries tasks and functions and
create a PClass to represent classes.
Within generate schemes it is possible to have nested scopes, even
more liberally then outside generate blocks. So see to it that the
scopes properly stack with the generate blocks, and that wires and
behaviors are put in the right scopes.
Named begin/end blocks burried within generate schemes need to be
elaborated. Handle this by remembering to elaborate_scope on the
statements within the generate scheme.
In the process, clean up/regularize some of the member names and
methods.
Move the storage of wires (signals) out of the Module class into
the PScope base class, and instead of putting the PWires all into
the Module object, distribute them into the various lexical scopes
(derived from PScope) so that the wire names do not need to carry
scope information.
This required some rewiring of elaboration of signals, and rewriting
of lexical scope handling.
All the pform objects that represent lexical scope now are derived
from the PScope class, and are kept in a lexical_scope table so that
the scope can be managed.
Modules, functions and tasks are named scopes so derive them all
from the PScope base class. These items all take scoped items, so
the eventual plan is to move these items into PScope.
Martin Whitaker
Maciej Suminski
Arun Persaud
Stephen Williams