mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-25 14:34:29 +00:00
333 lines
8.2 KiB
C
333 lines
8.2 KiB
C
/* subsegs.c - subsegments -
|
||
Copyright (C) 1987-2018 Free Software Foundation, Inc.
|
||
|
||
This file is part of GAS, the GNU Assembler.
|
||
|
||
GAS is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 3, or (at your option)
|
||
any later version.
|
||
|
||
GAS is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with GAS; see the file COPYING. If not, write to the Free
|
||
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
|
||
02110-1301, USA. */
|
||
|
||
/* Segments & sub-segments. */
|
||
|
||
#include "as.h"
|
||
|
||
#include "subsegs.h"
|
||
#include "obstack.h"
|
||
|
||
frchainS *frchain_now;
|
||
|
||
static struct obstack frchains;
|
||
|
||
static fragS dummy_frag;
|
||
|
||
|
||
void
|
||
subsegs_begin (void)
|
||
{
|
||
obstack_begin (&frchains, chunksize);
|
||
#if __GNUC__ >= 2
|
||
obstack_alignment_mask (&frchains) = __alignof__ (frchainS) - 1;
|
||
#endif
|
||
|
||
frchain_now = NULL; /* Warn new_subseg() that we are booting. */
|
||
frag_now = &dummy_frag;
|
||
}
|
||
|
||
/*
|
||
* subseg_change()
|
||
*
|
||
* Change the subsegment we are in, BUT DO NOT MAKE A NEW FRAG for the
|
||
* subsegment. If we are already in the correct subsegment, change nothing.
|
||
* This is used eg as a worker for subseg_set [which does make a new frag_now]
|
||
* and for changing segments after we have read the source. We construct eg
|
||
* fixSs even after the source file is read, so we do have to keep the
|
||
* segment context correct.
|
||
*/
|
||
void
|
||
subseg_change (segT seg, int subseg)
|
||
{
|
||
segment_info_type *seginfo = seg_info (seg);
|
||
now_seg = seg;
|
||
now_subseg = subseg;
|
||
|
||
if (! seginfo)
|
||
{
|
||
seginfo = XCNEW (segment_info_type);
|
||
seginfo->bfd_section = seg;
|
||
bfd_set_section_userdata (stdoutput, seg, seginfo);
|
||
}
|
||
}
|
||
|
||
static void
|
||
subseg_set_rest (segT seg, subsegT subseg)
|
||
{
|
||
frchainS *frcP; /* crawl frchain chain */
|
||
frchainS **lastPP; /* address of last pointer */
|
||
frchainS *newP; /* address of new frchain */
|
||
segment_info_type *seginfo;
|
||
|
||
mri_common_symbol = NULL;
|
||
|
||
if (frag_now && frchain_now)
|
||
frchain_now->frch_frag_now = frag_now;
|
||
|
||
gas_assert (frchain_now == 0
|
||
|| frchain_now->frch_last == frag_now);
|
||
|
||
subseg_change (seg, (int) subseg);
|
||
|
||
seginfo = seg_info (seg);
|
||
|
||
/* Attempt to find or make a frchain for that subsection.
|
||
We keep the list sorted by subsection number. */
|
||
for (frcP = *(lastPP = &seginfo->frchainP);
|
||
frcP != NULL;
|
||
frcP = *(lastPP = &frcP->frch_next))
|
||
if (frcP->frch_subseg >= subseg)
|
||
break;
|
||
|
||
if (frcP == NULL || frcP->frch_subseg != subseg)
|
||
{
|
||
/* This should be the only code that creates a frchainS. */
|
||
|
||
newP = (frchainS *) obstack_alloc (&frchains, sizeof (frchainS));
|
||
newP->frch_subseg = subseg;
|
||
newP->fix_root = NULL;
|
||
newP->fix_tail = NULL;
|
||
obstack_begin (&newP->frch_obstack, chunksize);
|
||
#if __GNUC__ >= 2
|
||
obstack_alignment_mask (&newP->frch_obstack) = __alignof__ (fragS) - 1;
|
||
#endif
|
||
newP->frch_frag_now = frag_alloc (&newP->frch_obstack);
|
||
newP->frch_frag_now->fr_type = rs_fill;
|
||
newP->frch_cfi_data = NULL;
|
||
|
||
newP->frch_root = newP->frch_last = newP->frch_frag_now;
|
||
|
||
*lastPP = newP;
|
||
newP->frch_next = frcP;
|
||
frcP = newP;
|
||
}
|
||
|
||
frchain_now = frcP;
|
||
frag_now = frcP->frch_frag_now;
|
||
|
||
gas_assert (frchain_now->frch_last == frag_now);
|
||
}
|
||
|
||
/*
|
||
* subseg_set(segT, subsegT)
|
||
*
|
||
* If you attempt to change to the current subsegment, nothing happens.
|
||
*
|
||
* In: segT, subsegT code for new subsegment.
|
||
* frag_now -> incomplete frag for current subsegment.
|
||
* If frag_now==NULL, then there is no old, incomplete frag, so
|
||
* the old frag is not closed off.
|
||
*
|
||
* Out: now_subseg, now_seg updated.
|
||
* Frchain_now points to the (possibly new) struct frchain for this
|
||
* sub-segment.
|
||
*/
|
||
|
||
segT
|
||
subseg_get (const char *segname, int force_new)
|
||
{
|
||
segT secptr;
|
||
segment_info_type *seginfo;
|
||
const char *now_seg_name = (now_seg
|
||
? bfd_get_section_name (stdoutput, now_seg)
|
||
: 0);
|
||
|
||
if (!force_new
|
||
&& now_seg_name
|
||
&& (now_seg_name == segname
|
||
|| !strcmp (now_seg_name, segname)))
|
||
return now_seg;
|
||
|
||
if (!force_new)
|
||
secptr = bfd_make_section_old_way (stdoutput, segname);
|
||
else
|
||
secptr = bfd_make_section_anyway (stdoutput, segname);
|
||
|
||
seginfo = seg_info (secptr);
|
||
if (! seginfo)
|
||
{
|
||
secptr->output_section = secptr;
|
||
seginfo = XCNEW (segment_info_type);
|
||
seginfo->bfd_section = secptr;
|
||
bfd_set_section_userdata (stdoutput, secptr, seginfo);
|
||
}
|
||
return secptr;
|
||
}
|
||
|
||
segT
|
||
subseg_new (const char *segname, subsegT subseg)
|
||
{
|
||
segT secptr;
|
||
|
||
secptr = subseg_get (segname, 0);
|
||
subseg_set_rest (secptr, subseg);
|
||
return secptr;
|
||
}
|
||
|
||
/* Like subseg_new, except a new section is always created, even if
|
||
a section with that name already exists. */
|
||
segT
|
||
subseg_force_new (const char *segname, subsegT subseg)
|
||
{
|
||
segT secptr;
|
||
|
||
secptr = subseg_get (segname, 1);
|
||
subseg_set_rest (secptr, subseg);
|
||
return secptr;
|
||
}
|
||
|
||
void
|
||
subseg_set (segT secptr, subsegT subseg)
|
||
{
|
||
if (! (secptr == now_seg && subseg == now_subseg))
|
||
subseg_set_rest (secptr, subseg);
|
||
mri_common_symbol = NULL;
|
||
}
|
||
|
||
#ifndef obj_sec_sym_ok_for_reloc
|
||
#define obj_sec_sym_ok_for_reloc(SEC) 0
|
||
#endif
|
||
|
||
symbolS *
|
||
section_symbol (segT sec)
|
||
{
|
||
segment_info_type *seginfo = seg_info (sec);
|
||
symbolS *s;
|
||
|
||
if (seginfo == 0)
|
||
abort ();
|
||
if (seginfo->sym)
|
||
return seginfo->sym;
|
||
|
||
#ifndef EMIT_SECTION_SYMBOLS
|
||
#define EMIT_SECTION_SYMBOLS 1
|
||
#endif
|
||
|
||
if (! EMIT_SECTION_SYMBOLS || symbol_table_frozen)
|
||
{
|
||
/* Here we know it won't be going into the symbol table. */
|
||
s = symbol_create (sec->symbol->name, sec, 0, &zero_address_frag);
|
||
}
|
||
else
|
||
{
|
||
segT seg;
|
||
s = symbol_find (sec->symbol->name);
|
||
/* We have to make sure it is the right symbol when we
|
||
have multiple sections with the same section name. */
|
||
if (s == NULL
|
||
|| ((seg = S_GET_SEGMENT (s)) != sec
|
||
&& seg != undefined_section))
|
||
s = symbol_new (sec->symbol->name, sec, 0, &zero_address_frag);
|
||
else if (seg == undefined_section)
|
||
{
|
||
S_SET_SEGMENT (s, sec);
|
||
symbol_set_frag (s, &zero_address_frag);
|
||
}
|
||
}
|
||
|
||
S_CLEAR_EXTERNAL (s);
|
||
|
||
/* Use the BFD section symbol, if possible. */
|
||
if (obj_sec_sym_ok_for_reloc (sec))
|
||
symbol_set_bfdsym (s, sec->symbol);
|
||
else
|
||
symbol_get_bfdsym (s)->flags |= BSF_SECTION_SYM;
|
||
|
||
seginfo->sym = s;
|
||
return s;
|
||
}
|
||
|
||
/* Return whether the specified segment is thought to hold text. */
|
||
|
||
int
|
||
subseg_text_p (segT sec)
|
||
{
|
||
return (bfd_get_section_flags (stdoutput, sec) & SEC_CODE) != 0;
|
||
}
|
||
|
||
/* Return non zero if SEC has at least one byte of data. It is
|
||
possible that we'll return zero even on a non-empty section because
|
||
we don't know all the fragment types, and it is possible that an
|
||
fr_fix == 0 one still contributes data. Think of this as
|
||
seg_definitely_not_empty_p. */
|
||
|
||
int
|
||
seg_not_empty_p (segT sec ATTRIBUTE_UNUSED)
|
||
{
|
||
segment_info_type *seginfo = seg_info (sec);
|
||
frchainS *chain;
|
||
fragS *frag;
|
||
|
||
if (!seginfo)
|
||
return 0;
|
||
|
||
for (chain = seginfo->frchainP; chain; chain = chain->frch_next)
|
||
{
|
||
for (frag = chain->frch_root; frag; frag = frag->fr_next)
|
||
if (frag->fr_fix)
|
||
return 1;
|
||
if (obstack_next_free (&chain->frch_obstack)
|
||
!= chain->frch_last->fr_literal)
|
||
return 1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
void
|
||
subsegs_print_statistics (FILE *file)
|
||
{
|
||
frchainS *frchp;
|
||
asection *s;
|
||
|
||
/* PR 20897 - check to see if the output bfd was actually created. */
|
||
if (stdoutput == NULL)
|
||
return;
|
||
|
||
fprintf (file, "frag chains:\n");
|
||
for (s = stdoutput->sections; s; s = s->next)
|
||
{
|
||
segment_info_type *seginfo;
|
||
|
||
/* Skip gas-internal sections. */
|
||
if (segment_name (s)[0] == '*')
|
||
continue;
|
||
|
||
seginfo = seg_info (s);
|
||
if (!seginfo)
|
||
continue;
|
||
|
||
for (frchp = seginfo->frchainP; frchp; frchp = frchp->frch_next)
|
||
{
|
||
int count = 0;
|
||
fragS *fragp;
|
||
|
||
for (fragp = frchp->frch_root; fragp; fragp = fragp->fr_next)
|
||
count++;
|
||
|
||
fprintf (file, "\n");
|
||
fprintf (file, "\t%p %-10s\t%10d frags\n", (void *) frchp,
|
||
segment_name (s), count);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* end of subsegs.c */
|