The parser always passes a single NULL argument for system tasks. For a
method call which will add a signal to call the method on we need to
ignore this NULL argument.
This required keeping for-loops as actual things through the
netlist form so that the synthesizer can get at and understand
the parts of the for-loop. This may improve vvp code generation
in the future, but for now continue to present to the vvp code
generation the block-while form.
This gets nested l-values to (but just short of) the ivl_target API.
Now the elaborator can process nested l-values, but I haven't figured
out how to present that at the ivl_target.h API.
It is better to leave the handling of PChainConstructor calls to
the elaboration, instead of stripping them out early. This allows
for handling the arguments of the chain constructor in the correct
scope.
Static properties are like variables in a named scope.
Detect these variables during elaboration so that the
code generator just sees them as variables.
This implementation works by detecting assignments
to constant properties in elaboration. Allow initializer
assignments to assign to the constant, error all other
assignments, and otherwise treat the constant like any
other property.
For constant word indices, issue a warning if the index is out of
range or an undefined value. In any case, the RHS value should be
discarded, and the actual assignment should be skipped.
If a logical pull device is converted into a CA then it is an assignment
with strength, so just emit the appropriate constant to get the correct
functionality (e.g. 1'b1 for a pull up and 1'b0 for a pull down).
Also add missing file/line information.
Add support for case, forever, and repeat statements in constant
functions. Also fix a bug in the constant function implementation
of NetESelect when used for zero/sign extension.
The compiler was treating case and case item expressions as
self-determined. They should be context-sensitive, just like
the operands of a comparison operation.
This patch implements the evaluate_function method for the NetDisable
and NetSTask classes. It also makes the checks for a function being
constant work when the function contains nested scopes (named blocks).
SystemVerilog allows a function to be called without an assignment for
the return value. This patch adds a warning that Icarus does not currently
support this and provides a place to add this functionality later.
This involves working out the code to get the base type of a select
expression of a darray. Also added the runtime support for darrays
with real value elements.
These two typedefs exactly matched earlier ones in the same scope and
gcc was complaining that they were shadowing the previous definitions.
Since the definitions matched exactly just deleting the second
typedef was acceptable.
Added: basic vpiPort VPI Objects for vpiModulkes
vpiDirection, vpiPortIndex, vpiName, vpiSize attributes
Since ports do not exist as net-like entities (nets either side
module instance boundaries are in effect connect directly in
the language front-ends internal representation) the port information
is effectively just meta-data passed through t-dll interface and
output as a additional annotation of module scopes in vvp.
Added: vpiLocalParam attribute for vpiParameter VPI objects
Added: support build for 32-bit target on 64-bit host (--with-m32
option to configure.in and minor tweaks to Makefiles and systemc-vpi).
Making the scope type NESTED_MODULE was just plain wrong, because
it didn't really encapsulate the meaning of program blocks OR
nested modules. So instead create nested_module() and program_block()
flags and use those to test scope constraints.
An important advantage of program blocks is its ability to nest
within a module. This winds up also allowing modules to nest, which
is legal but presumably less used feature.
This patch extends the compiler to support all specparam declarations
allowed by the 1364-2005 standard. For compatibility with other
simulators, it allows specparam values to be used in any constant
expression, but outputs a warning message and disables run-time
annotation of a specparam if it is used in an expression that must
be evaluated at compile time.
When a conditional statement is unnamed, it doesn't create a scope
and we get into "direct" generate scheme elaboration. This direct
elaboration needs to handle case generate schemes.
Tasks call arguments may be dropped in favor of default values.
Allow for that in the syntax. This requires a little handling
of the non-SystemVerilog case during elaboration.
An @* with no sensitivities should be treated as something that will
never trigger vs something that will run continuously. This patch makes
this change and adds a warning when an @* has no sensitivities since
this is almost certainly a coding bug.
To avoid a variables not initialized in the construct this patch modifies
the PSpecPath class to take the polarity and full_flag as arguments to
the constructor.
In a specify block a full connection is defined to only support a single
source and destination path. This patch adds an error message when this
is found, except we skip the error if all the paths are a single bit
wide. This exemption was added to match the functionality found in
NC-Verilog and presumably Verilog-XL.
A message was also added in place of an assert if the source signals was
not found in the current scope.
This patch uses the full_flag to verify that the input and output have the
same width for a parallel connection. Icarus always uses a full connection
so this is just a portability issue with other simulators.
The pform dump code was also modified to correctly display the polarity
and full/parallel connection type.
If a wait statement has a constant argument then the mode must be defined
before test_width() is called since the current mode is used in the
PENumber test_width routine.
Add a new IVL_PR_FINAL process type.
Add a flag to NetScope in_final_ which is set when elaborating the
statement of a final procedure.
Add checks during statement elaboration for invalid statements in a
final procedure, similar to checks for statements in functions.
Do a final check to make sure no final blocks have delays.
In the vvp runtime, use "$final" as the flag for the thread created by
the final procedure. During compilation, instead of adding such a
thread to the sched_list, add it to a new schedule_final_list that
mirrors the schedule_init_list, but is run at the end of simulation.
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>
Remove an unused variable (desired_vector_width) in elaborate.cc.
Reduce the scope of spin to make it obvious it is only used locally
in elaborate.cc. Initialize sel_type_ in the NetAssign_ constructor
(net_assign.cc). The code doesn't currently require this since
sel_type_ is only used when the base is not zero and it is always
defined when base is not zero, but giving this a default value in
the constructor hedges against accidentally using an undefined
value if someone checks the select type when the base is zero.
The compiler was handling bi-directional pass switches using the default
case for primitive gates, where the first port is treated as an output
and the remaining ports are treated as inputs. This patch adds a special
case for pass switches, so that the first two ports are treated as
bi-directional.
The -gno-specify flag should only control the delay and timing checks.
It should not also remove the specparams since they can be used outside
of a specify block.
The IEEE standard states that the port expressions used for arrays
of primitive gates must be the exact width required, but is silent
about the requirements for single instances. The consensus among
other simulators is that for input ports of single instances, the
expression is silently truncated to a single bit.
This patch also fixes a compiler crash if an error is found when
elaborating a primitive gate port expression.
This patch allows the compiler to perform early elaboration
of functions if they are encountered in expressions that are
elaborated before the function would normally be elaborated.
This makes the function available for constant evaluation.
Suitable error messages are generated if a function that is
used in a constant expression is not a valid constant function.
For now Icarus doesn't support a UDP instantiation with a range.
Instead of generating a warning about the port count being wrong
this patch adds code to calculate the range and print a message
if a range greater than one is found.
Stephen Williams
Cary R
Martin Whitaker
Larry Doolittle
Arun Persaud
Andrew Stevens
Martin Whitaker
Jared Casper
Prasad Joshi