STFD(3X)STFD(3X)NAMEstfd - routines that provide access to per file descriptor section of the
symbol table
SYNOPSIS
#include <syms.h>
long st_currentifd(void);
long st_ifdmax(void);
void st_setfd(long ifd);
long st_fdadd(char *filename);
long st_symadd(long iss, long value, long st, long sc, long freloc,
long index);
long st_auxadd(AUXU aux);
long st_stradd(char *cp);
long st_lineadd(long line);
long st_pdadd(long isym);
long st_ifd_pcfd(pCFDR pcfd1);
pCFDR st_pcfd_ifd(long ifd);
pSYMR st_psym_ifd_isym(long ifd; long isym);
pAUXU st_paux_ifd_iaux(long ifd, long iaux);
pAUXU st_paux_iaux(long iaux);
char *st_str_iss(long iss);
char *st_str_ifd_iss(long ifd, long iss);
pPDR st_ppd_ifd_isym(long ifd, long isym);
char *st_malloc(char *ptr, long *size, long itemsize, long baseitems);
DESCRIPTION
The stfd routines provide an interface to objects handled on a per file
descriptor (or fd) level (for example, local symbols, auxiliaries, local
strings, line numbers, optimization entries, procedure descriptor
entries, and the file descriptors). These routines constitute a group
because they deal with objects corresponding to fields in the FDR
structure.
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STFD(3X)STFD(3X)
A fd can be activated by reading an existing one into memory or by
creating a new one. The compilation unit routines st_readbinary and
st_readst read file descriptors and their constituent parts into memory
from a symbol table on disk.
St_fdadd adds a file descriptor to the list of file descriptors. The lang
field is initialized from a user specified global st_lang that should be
set to a constant designated for the language in <symconst.h>. The fMerge
field is initialized from the user specified global st_merge that
specifies whether the file is to start with the attribute of being able
to be merged with identical files at load time. The fBigendian field is
initialized by the gethostsex(3) routine, which determines the permanent
byte ordering for the auxiliary and line number entries for this file.
St_fdadd adds the null string to the new files string table that is
accessible by the constant issNull. It also adds the filename to the
string table and sets the rss field. Finally, the current file is set to
the newly added file so that later calls operate on that file.
All routines for fd-level objects handle only the current file unless a
file index is specified. The current file can also be set with st_setfd.
Programs can find the current file by calling st_currentifd, which
returns the current index. Programs can find the number of files by
calling st_ifdmax. The fd routines only require working with indices to
do most things. They allow more in-depth manipulation by allowing users
to get the compile time file descriptor (CFDR see <cmplrs/stsupport.h>)
that contains memory pointers to the per file tables (rather than indices
or offsets used in disk files). Users can retrieve a pointer to the CFDR
by calling st_pcfd_ifd with the index to the desired file. The inverse
mapping st_ifd_pcfd exists, as well.
Each of fd's constituent parts has an add routine: st_symadd, st_stradd,
st_lineadd, st_pdadd, and st_auxadd. The parameters of the add routines
correspond to the fields of the added object (see <sym.h>). The pdadd
routine lets users fill in the isym field only. Further information can
be added by directly accessing the procedure descriptor entry.
The add routines return an index that can be used to retrieve a pointer
to part of the desired object with one of the following routines:
st_psym_isym, st_str_iss, and st_paux_iaux. NOTE: These routines only
return objects within the current file. The following routines allow for
file specification: st_psym_ifd_isym, st_aux_ifd_iaux, and
st_str_ifd_iss.
St_ppd_ifd_isym allows access to procedures through the file index for
the file where they occur and the isym field of the entry that points at
the local symbol for that procedure.
The return index from st_symadd should be used to get a dense number (see
stcu). That number should be the ucode block number for the object the
symbol describes.
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STFD(3X)STFD(3X)
The programs must be loaded with the object file access routine library
libmld.a.
SEE ALSOstfe(3x), stcu(3x)BUGS
The interface will added to incrementally, as needed.
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