When printing the strength information for a multi bit net this patch
adds an underscore between the individual bit strength values. This
makes it easier to see the individual bit values.
Fallout from me trying to understand the origin of pr1780480
and pr1830834. Too bad I don't understand c++ and vvp as
well as I understand English!
(Spelling and grammer fixes in comments. -ed.)
This patch adds ivl_scope_time_precision() to the compiler which can
be used to extract the local scope precision. tgt-stub and tgt-vvp
have been modified to use this new function and output a value that
is appropriate. The vvp runtime has been altered to use this new
data which is accessed with the vpip_time_precision_from_handle()
function. vpiTimePrecision uses this function to return the correct
precision.
This patch implements the swrite* and sformat system tasks. It also
makes $simtime distinguishable from the other integer time tasks.
This was needed to get the correct time units when $simtime was given
as an argument to $swrite*. The string constant code was also modified
to allow a string to be returned as a vector (0/1 bit pattern).
Here are some more specifics about the swrite* changes.
1. They do not share formatting code with the other display functions,
so they may/will produce different results.
2. All %{alpha} codes allow a width and justification. Others have been
enhanced (%t allows the default width and precision to be overridden,
time functions print with time formatting, better error checking and
messages, etc.).
3. %u and %z formatting codes have been added. It is important to note
that these two formats can produce embedded NULLs, since these
functions are returning a string anything after the first NULL will
not be reachable! memcpy is used instead of regular string processing
where needed so that the original string will contain the total
result. The size returned when the string is created is the true
length. A warning will be printed if a string with embedded NULLs is
produced (strlen() does not match the true length).
4. Real numbers are printed with %g instead of %f.
Once this new formatting code has been evaluated we should incorporate
the changes/fixes into the formatting code for the other functions or
the other functions could be modified to use this new code. The true
string length is available so we should be able to work around the
embedded NULL problem.
Even though vpiFinish does not currently do anything with it's
argument I thought it would be best to have them all be in the
correct range [0, 1, 2], so they have been updated as appropriate.
Backslash-escapes are processed early, during elaboration, so that
escaped characters show up in all places with the calculated value.
This means the $display formatting will get processed strings and
should not process back-slashes again.
Signed-off-by: Stephen Williams <steve@icarus.com>
as well as a user specified log file, set log
file to buffer lines.
Add vpi_flush function, and clear up some cunfused
return codes from other vpi functions.
Adjust $display and vcd/lxt messages to use the
standard output/log file.
Cary R
Larry Doolittle
Stephen Williams
steve