Use the common data_type_or_implicit rules to support type
definitions for parameters. This eliminates a bunch of special
rules in parse.y, and opens the door for parameters having
more complex types.
Depending on the order of elaboration, a function may not have been
elaborated before a call to it is elaborated, so don't assert that it
has been. As an optimisation, try to elaborate it on the fly, so we can
elide the call if the function body is empty.
This.new is not allowed.
super.new beyond the first statement is not allowed.
And while I'm at it, clean up the use of "@" and "#" in
the code as tokens for this and super.
When module ports are collapsed, we can't tell which of the nexus drivers
are associated with a given module port and should be routed through an
associated modpath delay. Work round this by inserting a transparent
buffer or tran_vp if an output or inout port has a modpath delay. The
target code generator can elide this once it has handled the modpath
delays.
The unique, unique0, and priority keywords can decorate case statements
to tell the run time (or synthesis) to do extra tests (or make extra
assumptions). These tests are not implemented in the vvp run time, but
now the decorations make it to the code generators.
Explicit imports should always conflict with local declarations using
the same name. Wildcard imports only conflict if they are referenced
before a local declaration with the same name.
This also unifies the detection of identifier conflicts.
This implements and enforces the full set of rules for determining
timescales in SystemVerilog. The previous relaxation of the rules
that allowed timescales to be redefined within the compilation unit
scope has been removed. Time unit and precision redeclarations are
now recognised after a nested module declaration.
The compilation unit scope is now treated as a specialised form of
package (with an automatically generated name). All items declared
outside a design element are added to the current compilation unit
package. Apart from when searching for a symbol, once we get into
elaboration we can treat these just like any other package.
Stephen Williams
Cary R
Martin Whitaker
Purdea Andrei
Purdea Andrei