This patch finishes the code needed to translate a SystemVerilog package to a
module with a special name. It also adds code to report that class scopes are
not supported and treats both a class and package as a top level scope.
There are limitations with this since the compiler does not pass all
the information that was present in the original source, but it is enough
to get a valid simulation result. It is not enough for timing analysis!
specparams are also incorrectly translated to parameters so they show up
in the wrong place.
If modules instantiations were always handled correctly this would not be
needed, but for now looking for the nexus driver outside the scope is
needed to make some of the tests work.
In SystemVerilog a task or function can initialize a variable in a task or
function. In Icarus this is done by creating an initial block that does
the assignment. We can translate this by emitting the initial block in the
enclosing module scope. This is not 100% correct since SystemVerilog
requires the initialization to be done before the other initial/always
blocks are processed. For SystemVerilog the current Icarus behavior is
incorrect, but even if it had a new process type that ran before the other
ones the best I can do for vlog95 is emit it before the normal module
processes which currently works.
In the starting comment say if the conversion was done with signed support.
If there were errors then add a comment at the end of the file that says
how many errors occurred and add a line after this that prevents the file
from running with out an error. This requires the user to see that errors
occurred and remove the offending line if they want to use the file anyway.
Since the vlog95 code generator needs the strength information we do
not want to hide it behind a concat-Z optimization. For now we abort
the optimization, but in the future we could add parts of this back
in (e.g. all the drivers have matching strength then replace with a
normal concat and a buf-Z if the strength are not both strong. The
original buf-Z should be removed to reduce the number of LPM devices).
The Verilog-A abs(), min() and max() functions can be converted if the
expressions do not have side effects. Also note the new, null and class
property operators from SystemVerilog are not supported.
This patch updates the code to translate the SystemVerilog assignments with
an opcode to the appropriate vlog95. This includes ++ and -- when used in
a statement context. The ++ and -- operators are not currently translated
in an expression context. This translation only occurs in two places:
A simple assignment statement (foo += 2;) and the increment of a for
statement. I still need to check if there are other places where these
operators are allowed.
SystemVerilog supports using assignments with opcodes (e.g. +=). This
patch checks for these in a few common places and prints a warning
that they are not currently supported. Eventually the simple cases
will be converted.
We can not convert SystemVerilog strings or dynamic arrays to valid vlog95.
This patch adds an error message that they are not supported. There are still
issues with converting some of the dynamic array constructs (the compiler
crashes), but the message is printed before the crash.
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.
Icarus uses 'i' in the net expressions for a cast to integer. Replacing
it with 'v' would free the character 'i' that can be used for increment
operators. This changes cast operators to become 'v', '2', and 'r'.
Signed-off-by: Prasad Joshi <prasad@canopusconsultancy.com>
Suggested-by: Cary R. <cygcary@yahoo.com>
isprint() is defined to take an int and if it is defined as a macro then
you can get a warning that a char is being used as an array index. This
patch fixes this warning in tgt-vlog95/msic.c
This patch adds the ability to print a constant string in a
structural context. It also fixes the argument order for
structural function calls and makes a few improvements in
nexus identification.
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 uses the new function (ivl_logic_is_cassign) to determine
if a logical was really the base of a continuous assignment. This
allows creating code that more closely matches the original.
This patch adds support for correctly handling most unconnected ports.
Most important is top level ports that are the root of the conversion.
This patch also adds support for emitting more signed constructs when
they are requested. $signed() and $unsigned() are still not supported
or recognized as an error when not emitting signed constructs.
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.
The logic_lpm.c file uses the nexus private data pointer as an
unsigned counter. This patch makes the value unsigned long to
avoid a compilation warning on 64 bit systems.
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.
A valarray of an enum does not initialize to 0 so explicitly specify the
value to fill the array with. This was causing the compiler to incorrectly
report that fixed width elements in a concatenation had no size.
The following was done to remove compiler warning when using the native
compiler on OpenSolaris.
Remove the anonymous unions in tgt-vlog95/stmt.c and tgt-vvp/vvp_process.c.
Use UINT_MAX for the maximum unsigned unsigned instead of -1 in
tgt-vvp/draw_net_input.c.
Even though lex defines yywrap() to have no arguments when %option
noyywrp is used it generates a define that takes an argument that is not
used. The compiler warned about this so remove the option and add a
dummy yywrap function.
Cary R
Arun Persaud
Prasad Joshi
Larry Doolittle