In order to support Mach-O better, add support for subsections, as
used by Mach-O "subsections_via_symbols". We also want to add
infrastructure to support this by downcalling to the backend to
indicate if a new subsection is needed.
Currently this supports a maximum of 2^14 subsections per section for
Mach-O; this can be addressed by adding a level of indirection (or
cleaning up the handling of sections so we have an actual data
structure.)
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
MachO has this odd thing called "subsections via symbols", by which a
symbol can magically start what effectively is a new section. To
support this, add support for a calldown into the backend when a new
symbol is defined *at the current output location*, and allow it to
switch the current segment.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Remove casts from allocations. This is simply Not How To Do Things:
every cast carries a potential risk of being a toxic type misuse
(e.g. pointer as integer) and so any unnecessary cast is actively
harmful.
Note that a lot of allocations here are completely unnecessary: the
core code now guarantees that all filenames are permanently allocated
for the duration of the assembly, and so should be turned into const
char * without any further allocation. Any remaining malloc+strcpy
should be turned into nasm_strdup(), and nasm_new[n]() used whereever
possible.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Global variables need to be declared in a header file; "extern" in C
files should be used extremely rarely (it is OK at least for now for
macro tables as they are generally only ever used in one specific
location, but otherwise, no.)
In a few cases the global variables were actually function-local!
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Move directive processing to its own file, and move nasmlib/error.c to
asm/error.c (it was not used by the disassembler); remove some extern
declarations from .c files, and do some general code cleanups.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Make the source code easier to understand and keep track of by
organizing it into subdirectories depending on the function.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
