We don't support evaluating user-defined system functions at compile
time. If possible, defer evaluation until run time. If used in a
constant expression, output a "sorry" message.
The functions (malloc, free, etc.) that used to be provided in
malloc.h are now provided in cstdlib for C++ files and stdlib.h for
C files. Since we require a C99 compliant compiler it makes sense
that malloc.h is no longer needed.
This patch also modifies all the C++ files to use the <c...>
version of the standard C header files (e.g. <cstdlib> vs
<stdlib.h>). Some of the files used the C++ version and others did
not. There are still a few other header changes that could be done,
but this takes care of much of it.
This patch cleans up some unneeded code. Releases some allocated
memory before the compiler quits and fixes a couple minor memory
leaks in the compiler and vvp code generator.
The sys_funcs table should be left to those functions that are handled
internally by the compiler. Really, the internal sys_funcs table is a
legacy from the days before the compiler supported system function
tables in the .sft format.
System functions used in a continuous assignment must be defined
in the system function table since the name of the system functions
is kept in this definition. The default name is NULL which causes
problems. This patch add $rtoi to the system table and adds a check
for a NULL name.
In nets, if system functions return a real value the function lookup
was getting the correct width, but was also setting the width to 0,
which confused down-stream net handling. Real-value system fuctions
have a width of 1. (1 real-valued scalar.)
Martin Whitaker
Maciej Suminski
Arun Persaud
Larry Doolittle
Cary R
Stephen Williams
steve