The vlog95 code generator collects all the constant assignments to a net
within each scope and then emits them. The old code only recorded the
ivl_signal_t for each constant assignment, which meant it had to iterate
through the nexus pointers in the assicated nexus to find the constant.
When there were multiple constant assignments to the same net, it needed
to record which assignments had already been emitted, which it did by
keeping a count in the nexus private data and skipping that many constants
on each successive assignment. However the count did not get reset after
emitting all the assignments in that scope, so if there were assignments
to the same net made in another scope, the count would already be positive
and those assignments would also be skipped.
This could probably have been fixed by clearing the nexus private data
after processing the constant assignment list for each scope, but it is
more efficient to record the ivl_nexus_ptr_t for each constant along with
the ivl_signal_t, eliminating the need to search for the associated nexus
pointer.
119 formal void parameters added to keep -Wstrict-prototypes happy.
Process found one real missing prototype in vpi/vcd_priv.h:
EXTERN void vcd_names_delete(struct vcd_names_list_s*tab);
8 such warnings left, all in Tony's code
Add support for detecting when to add a $signed() or $unsigned() to
create a self-determined context. This makes the test in the test suite
pass, but there could still be issues
The actual signal code is trivial, but the emit expression code needed
to be enhanced to pass a flag that says if one of the arguments in a
binary (except the shifts) or ternary (excluding the condition) context
is unsigned. This information is used to prevent emitting an explicit
$unsigned() for a signal that is used in this context since it will be
implicitly cast to unsigned.
This patch adds support for SystemVerilog packed arrays and adds sorry
messages for generate blocks as well as the new SV final and
fork/join_any/join_none statements.
Rework the nexus emitting code to correctly translate most I/O ports.
Fix a few other expression issues uncovered when port translation was
done correctly. Ignore and warn that the SV ++/-- operators and enum
types are not translatable. More updates of the nexus debug code.
This patch adds code to make sure a double (Verilog real) constant
is printed correctly. It also adds code to trim any leading escaped
NULLs from an expression string.
This patch adds a flag -pallowsigned=1 to the vlog95 converter that
tells it to allow signed signals. There is currently no code to check
for and warn/emit the $signed() and $unsigned() system functions. I
need to determine if >>> emitting should also be controlled by the
allow signed flag.
This patch adds support for emitting escaped identifiers and adds
code to correctly emit most module port expressions/definitions.
There are some minor code optimizations/cleanup included as well.
This patch adds support for emitting fixed CA selects (zero based
variable bit and array selects also work), emitting a for statement
as a single statement and fixes for numerous little bugs. It also
adds the start of emitting module port information.
This patch fixes the following bugs in the vlog95 converter:
When emitting a signal as an expression, if the signal is local then
emit the expression that is driving the local signal.
The casts need to emit the expression.
When emitting pull devices they have different default strength rules
(pull is the default).
For compatibility pull devices should only have a single output net.
Extend the code that searches for the <var> = <delay> <value> pattern
to also check for an <event>. The previous event code only looks for
the repeat event pattern.
This patch adds a flag that emits file and line information for
most lines. This can help the user understand where the various
lines came from in the original code. They are printed as
comments so the generated code still runs correctly.
This patch adds the following to the vlog95 converter.
Add support for emitting and calling UDPs.
Generate a UDP for a synthesized DFF.
Add the ability do emit a constant assigned to a net.
This patch moves the logic and lpm code to a new file. It refactors
the strength emitting routine and adds support for emitting the
standard tran style of gates.
This patch add the following functionality to the vlog95 generator.
Add support for most CAs. Selects still don't work correctly.
Emitting a named event as an expression.
Enhance the ability to find a signal in a nexus.
Add code to emit a nexus driven by a constant.
Rework the delay/strength code for logic gates/CAs
Refactor some of the number code.
Refactor the variable emitting code to support named blocks.
Translate the compiler code back to <var> = <event> <value>
This patch adds preliminary support for finding the correct name for
a nexus at a given scope level. It also does the following.
Report that real modulus is not supported.
Fix a bug in the generation of concat expressions.
Add missing generation of unary ! operator.
Add ability to generate > integer delays.
Refactor some of the support code.
Make some of the error messages more descriptive.
Ignore the ALLOC and FREE statements (only used with automatic tasks).
This patch adds significantly more functionality to the vlog95 back end.
The following are the major additions:
Display unsigned numbers without undefined bits in hex.
Add support for both L-Value and R-value bit and part selects.
Added support for out of scope references.
Added support for emitting logic gates (range not finished, name is invalid).
Added support for emitting initial/always blocks.
Add support for event inter statement delays.
Convert a blocking inter statement delay assign back to the original form.
Added support for rescaling variable delays.
Added support for the disable statement.
Added support for an event trigger statement (event name is missing).
Added support for calling a user task (calling arguments are missing).
Added support for an event based delay statement (@) (event name is missing)
Not all of these are working as expected since there is not currently a
routine to find a nexus name as a function of scope (needed for event names,
logic gate ports, etc.). Since the Icarus compiler generates structural code
the arguments to modules, module instantiations and calling user tasks are
also still missing.
This patch adds support for the various case statements and adds
preliminary support for instantiating modules. The module instantiation,
just like the module definition, is still missing ports. Adding this
will require modification to the compiler to get the port order correct.
Because of defparams and passed parameters any module that has a
parameter must be generated uniquely for each instance since they may not
all be the same. Modules without parameters are only generated once.
This patch adds the ability to print a delay expression (it is rescaled
to the module timescale) and adds support the following statement types:
nonblocking assignment with a delay (event control is still missing)
condition (if/else)
forever
repeat
while (Icarus translated for loops to while loops)
fork
procedural continuous assign
deassign
force
release
This patch adds more support to the Verilog 1995 converter. There is
still a lot that is missing and there is still some implemented
functionality that is not 100%.
Martin Whitaker
Cary R
Larry Doolittle