Clean up warnings that show up on newer compilers. Many of these warnings
are related to obsolete c library features or language features. This does
not clear up warnings in code generated by bison or flex.
SystemVerilog supports type parameters. These are similar to value
parameters, but they allow to pass a type to a module or similar when
instantiating it.
E.g.
```
module A #(parameter type T = int);
endmodule
module B;
A #(.T(real)) i_a;
endmodule
```
Add support for handling type parameters.
For the vlog95 and vhdl backends type parameters, similar to typedefs, get
replaced with their actual value. For modules with non-local type
parameters for each module instance a unique module or architecture is
generated with the actual type.
Querying type parameters through VPI is not yet supported.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
This is a fix for pr2555831. A separate entity/architecture pair is
generated for each module that is instantiated with a unique
parameter combination.
This is a fix for pr2555831. A separate entity/architecture pair is
generated for each module that is instantiated with a unique
parameter combination.
The Cygwin compiler is a bit picky. This patch adds some casts
to remove compilation warnings. In the past I have had warnings
off because of problems with the STL, but we may as well get
rid of the warnings we can. It also does not recognize that an
assert(0) or assert(false) ends a routine so it complains about
no return at end of function or variables not being defined.
This avoids generating invalid VHDL signal names in the
following cases:
- The name begins or ends with an underscore
- The name contains two consecutive underscores
- The name is the same as a component declaration
- The name differs from another only in case
Previously the VHDL code generator managed memory for
the AST objects by requiring that each AST element be
responsible for deleting its children. The disadvantages
of this are that it's quite easy to accidentally leak
memory by forgetting to delete a child, and no AST pointers
may be shared by multiple parents (or we'd end up with
double-deletes) -- this results in unnecessary copies of
objects being made.
There's no real need for fine-grained memory management of
AST objects since once they're allocated they tend to
persist until the code generator is about to terminate, when
they should all be freed.
This patch provides a custom new/delete operator for
vhdl_element which logs the vhdl_element objects allocated
in a std::vector (after calling the default operator new).
Once the code generator is finished a single free_all_objects
call deletes all the AST objects in one go. The custom delete
operator is required so that we can still explicitly deallocate
vhdl_element objects before the code generator completes.
There are also some allocation statistics printed at the end
when -pdebug=1 is specified.
Cary R
Stephen Williams
Lars-Peter Clausen
Christian Taedcke
Nick Gasson
Stephen Williams