/* subsegs.c - subsegments -
- Copyright (C) 1987, 1990, 1991, 1992, 1993, 1994
+ Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005
Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
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, 675 Mass Ave, Cambridge, MA 02139, USA. */
+ 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.
- */
+/* Segments & sub-segments. */
#include "as.h"
frchainS *frchain_root, *frchain_now;
-#ifndef BFD_ASSEMBLER
-#ifdef MANY_SEGMENTS
-segment_info_type segment_info[SEG_MAXIMUM_ORDINAL];
-
-#else
-/* Commented in "subsegs.h". */
-frchainS *data0_frchainP, *bss0_frchainP;
-
-#endif /* MANY_SEGMENTS */
-char *const seg_name[] =
-{
- "absolute",
-#ifdef MANY_SEGMENTS
- "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9",
-#else
- "text",
- "data",
- "bss",
-#endif /* MANY_SEGMENTS */
- "unknown",
- "ASSEMBLER-INTERNAL-LOGIC-ERROR!",
- "expr",
- "debug",
- "transfert vector preload",
- "transfert vector postload",
- "register",
- "",
-}; /* Used by error reporters, dumpers etc. */
-#else /* BFD_ASSEMBLER */
+static struct obstack frchains;
/* Gas segment information for bfd_abs_section_ptr and
bfd_und_section_ptr. */
static segment_info_type *abs_seg_info;
static segment_info_type *und_seg_info;
-#endif /* BFD_ASSEMBLER */
+static void subseg_set_rest (segT, subsegT);
+
+static fragS dummy_frag;
-static void subseg_set_rest PARAMS ((segT, subsegT));
+static frchainS absolute_frchain;
\f
void
-subsegs_begin ()
+subsegs_begin (void)
{
- /* Check table(s) seg_name[], seg_N_TYPE[] is in correct order */
-#if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
- know (SEG_ABSOLUTE == 0);
- know (SEG_TEXT == 1);
- know (SEG_DATA == 2);
- know (SEG_BSS == 3);
- know (SEG_UNKNOWN == 4);
- know (SEG_GOOF == 5);
- know (SEG_EXPR == 6);
- know (SEG_DEBUG == 7);
- know (SEG_NTV == 8);
- know (SEG_PTV == 9);
- know (SEG_REGISTER == 10);
- know (SEG_MAXIMUM_ORDINAL == SEG_REGISTER);
+ obstack_begin (&frchains, chunksize);
+#if __GNUC__ >= 2
+ obstack_alignment_mask (&frchains) = __alignof__ (frchainS) - 1;
#endif
- obstack_begin (&frags, 5000);
frchain_root = NULL;
- frchain_now = NULL; /* Warn new_subseg() that we are booting. */
- /* Fake up 1st frag. It won't be used=> is ok if obstack...
- pads the end of it for alignment. */
- frag_now = (fragS *) obstack_alloc (&frags, SIZEOF_STRUCT_FRAG);
- memset (frag_now, 0, SIZEOF_STRUCT_FRAG);
-
-#ifndef BFD_ASSEMBLER
- /* This 1st frag will not be in any frchain.
- We simply give subseg_new somewhere to scribble. */
- now_subseg = 42; /* Lie for 1st call to subseg_new. */
-#ifdef MANY_SEGMENTS
- {
- int i;
- for (i = SEG_E0; i < SEG_UNKNOWN; i++)
- {
- subseg_set (i, 0);
- segment_info[i].frchainP = frchain_now;
- }
- }
-#else
- subseg_set (SEG_DATA, 0); /* .data 0 */
- data0_frchainP = frchain_now;
-
- subseg_set (SEG_BSS, 0);
- bss0_frchainP = frchain_now;
-
-#endif /* ! MANY_SEGMENTS */
-#endif /* ! BFD_ASSEMBLER */
+ frchain_now = NULL; /* Warn new_subseg() that we are booting. */
+ frag_now = &dummy_frag;
+
+ absolute_frchain.frch_seg = absolute_section;
+ absolute_frchain.frch_subseg = 0;
+ absolute_frchain.fix_root = absolute_frchain.fix_tail = 0;
+ absolute_frchain.frch_frag_now = &zero_address_frag;
+ absolute_frchain.frch_root = absolute_frchain.frch_last = &zero_address_frag;
}
\f
/*
* segment context correct.
*/
void
-subseg_change (seg, subseg)
- register segT seg;
- register int subseg;
+subseg_change (register segT seg, register int subseg)
{
+ segment_info_type *seginfo;
now_seg = seg;
now_subseg = subseg;
-#ifdef BFD_ASSEMBLER
- {
- segment_info_type *seginfo;
- seginfo = (segment_info_type *) bfd_get_section_userdata (stdoutput, seg);
- if (! seginfo)
- {
- seginfo = (segment_info_type *) xmalloc (sizeof (*seginfo));
- memset ((PTR) seginfo, 0, sizeof (*seginfo));
- seginfo->fix_root = NULL;
- seginfo->fix_tail = NULL;
- seginfo->bfd_section = seg;
- seginfo->sym = 0;
- if (seg == bfd_abs_section_ptr)
- abs_seg_info = seginfo;
- else if (seg == bfd_und_section_ptr)
- und_seg_info = seginfo;
- else
- bfd_set_section_userdata (stdoutput, seg, (PTR) seginfo);
- }
- }
-#else
-#ifdef MANY_SEGMENTS
- seg_fix_rootP = &segment_info[seg].fix_root;
- seg_fix_tailP = &segment_info[seg].fix_tail;
-#else
- if (seg == SEG_DATA)
- {
- seg_fix_rootP = &data_fix_root;
- seg_fix_tailP = &data_fix_tail;
- }
- else if (seg == SEG_TEXT)
- {
- seg_fix_rootP = &text_fix_root;
- seg_fix_tailP = &text_fix_tail;
- }
- else
+ if (now_seg == absolute_section)
+ return;
+
+ seginfo = (segment_info_type *) bfd_get_section_userdata (stdoutput, seg);
+ if (! seginfo)
{
- know (seg == SEG_BSS);
- seg_fix_rootP = &bss_fix_root;
- seg_fix_tailP = &bss_fix_tail;
+ seginfo = (segment_info_type *) xmalloc (sizeof (*seginfo));
+ memset ((PTR) seginfo, 0, sizeof (*seginfo));
+ seginfo->fix_root = NULL;
+ seginfo->fix_tail = NULL;
+ seginfo->bfd_section = seg;
+ seginfo->sym = 0;
+ if (seg == bfd_abs_section_ptr)
+ abs_seg_info = seginfo;
+ else if (seg == bfd_und_section_ptr)
+ und_seg_info = seginfo;
+ else
+ bfd_set_section_userdata (stdoutput, seg, (PTR) seginfo);
}
-
-#endif
-#endif
}
\f
static void
-subseg_set_rest (seg, subseg)
- segT seg;
- subsegT subseg;
+subseg_set_rest (segT seg, subsegT subseg)
{
- long tmp; /* JF for obstack alignment hacking */
register frchainS *frcP; /* crawl frchain chain */
register frchainS **lastPP; /* address of last pointer */
frchainS *newP; /* address of new frchain */
- register fragS *former_last_fragP;
- register fragS *new_fragP;
- if (frag_now) /* If not bootstrapping. */
+ mri_common_symbol = NULL;
+
+ if (frag_now && frchain_now)
+ frchain_now->frch_frag_now = frag_now;
+
+ assert (frchain_now == 0
+ || now_seg == undefined_section
+ || now_seg == absolute_section
+ || frchain_now->frch_last == frag_now);
+
+ subseg_change (seg, (int) subseg);
+
+ if (seg == absolute_section)
{
- frag_now->fr_fix = (char*) obstack_next_free (&frags) - frag_now->fr_literal;
- frag_wane (frag_now); /* Close off any frag in old subseg. */
+ frchain_now = &absolute_frchain;
+ frag_now = &zero_address_frag;
+ return;
}
- /*
- * It would be nice to keep an obstack for each subsegment, if we swap
- * subsegments a lot. Hence we would have much fewer frag_wanes().
- */
- {
- obstack_finish (&frags);
- /*
- * If we don't do the above, the next object we put on obstack frags
- * will appear to start at the fr_literal of the current frag.
- * Also, above ensures that the next object will begin on a
- * address that is aligned correctly for the engine that runs
- * this program.
- */
- }
- subseg_change (seg, (int) subseg);
+
+ assert (frchain_now == 0
+ || now_seg == undefined_section
+ || frchain_now->frch_last == frag_now);
+
/*
* Attempt to find or make a frchain for that sub seg.
* Crawl along chain of frchainSs, begins @ frchain_root.
* position of chain rooted in frchain_root.
*/
for (frcP = *(lastPP = &frchain_root);
- frcP && (int) (frcP->frch_seg) <= (int) seg;
+ frcP && frcP->frch_seg <= seg;
frcP = *(lastPP = &frcP->frch_next))
{
- if ((int) (frcP->frch_seg) == (int) seg
+ if (frcP->frch_seg == seg
&& frcP->frch_subseg >= subseg)
{
break;
*
*/
if (!frcP
- || ((int) (frcP->frch_seg) > (int) seg
- || frcP->frch_subseg > subseg)) /* Kinky logic only works with 2 segments. */
+ || (frcP->frch_seg > seg
+ || frcP->frch_subseg > subseg)) /* Kinky logic only works with 2 segments. */
{
/*
* This should be the only code that creates a frchainS.
*/
- newP = (frchainS *) obstack_alloc (&frags, sizeof (frchainS));
- memset (newP, 0, sizeof (frchainS));
- /* This begines on a good boundary because a obstack_done()
- preceeded it. It implies an obstack_done(), so we expect
- the next object allocated to begin on a correct boundary. */
- *lastPP = newP;
- newP->frch_next = frcP; /* perhaps NULL */
- (frcP = newP)->frch_subseg = subseg;
+ segment_info_type *seginfo;
+
+ newP = (frchainS *) obstack_alloc (&frchains, sizeof (frchainS));
+ newP->frch_subseg = subseg;
newP->frch_seg = seg;
- newP->frch_last = NULL;
-#ifdef BFD_ASSEMBLER
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_root = newP->frch_last = newP->frch_frag_now;
+
+ *lastPP = newP;
+ newP->frch_next = frcP; /* perhaps NULL */
+
+ seginfo = seg_info (seg);
+ if (seginfo && seginfo->frchainP == frcP)
+ seginfo->frchainP = newP;
+
+ frcP = newP;
}
/*
- * Here with frcP ->ing to the frchainS for subseg.
+ * Here with frcP pointing to the frchainS for subseg.
*/
frchain_now = frcP;
- /*
- * Make a fresh frag for the subsegment.
- */
- /* We expect this to happen on a correct boundary since it was
- proceeded by a obstack_done(). */
- tmp = obstack_alignment_mask (&frags); /* JF disable alignment */
- obstack_alignment_mask (&frags) = 0;
- frag_now = (fragS *) obstack_alloc (&frags, SIZEOF_STRUCT_FRAG);
- memset (frag_now, 0, SIZEOF_STRUCT_FRAG);
- obstack_alignment_mask (&frags) = tmp;
- /* But we want any more chars to come immediately after the
- structure we just made. */
- new_fragP = frag_now;
- new_fragP->fr_next = NULL;
- /*
- * Append new frag to current frchain.
- */
- former_last_fragP = frcP->frch_last;
- if (former_last_fragP)
- {
- know (former_last_fragP->fr_next == NULL);
- know (frchain_now->frch_root);
- former_last_fragP->fr_next = new_fragP;
- }
- else
- {
- frcP->frch_root = new_fragP;
- }
- frcP->frch_last = new_fragP;
+ frag_now = frcP->frch_frag_now;
+
+ assert (frchain_now->frch_last == frag_now);
}
/*
* Frchain_root updated if needed.
*/
-#ifndef BFD_ASSEMBLER
-
segT
-subseg_new (segname, subseg)
- const char *segname;
- subsegT subseg;
-{
- int i;
-
- for (i = 0; i < (int) SEG_MAXIMUM_ORDINAL; i++)
- {
- const char *s;
-
- s = segment_name ((segT) i);
- if (strcmp (segname, s) == 0
- || (segname[0] == '.'
- && strcmp (segname + 1, s) == 0))
- {
- subseg_set ((segT) i, subseg);
- return (segT) i;
- }
-#ifdef obj_segment_name
- s = obj_segment_name ((segT) i);
- if (strcmp (segname, s) == 0
- || (segname[0] == '.'
- && strcmp (segname + 1, s) == 0))
- {
- subseg_set ((segT) i, subseg);
- return (segT) i;
- }
-#endif
- }
-
-#ifdef obj_add_segment
- {
- segT new_seg;
- new_seg = obj_add_segment (segname);
- subseg_set (new_seg, subseg);
- return new_seg;
- }
-#else
- as_bad ("Attempt to switch to nonexistent segment \"%s\"", segname);
- return now_seg;
-#endif
-}
-
-void
-subseg_set (seg, subseg) /* begin assembly for a new sub-segment */
- register segT seg; /* SEG_DATA or SEG_TEXT */
- register subsegT subseg;
-{
-#ifndef MANY_SEGMENTS
- know (seg == SEG_DATA || seg == SEG_TEXT || seg == SEG_BSS);
-#endif
-
- if (seg != now_seg || subseg != now_subseg)
- { /* we just changed sub-segments */
- subseg_set_rest (seg, subseg);
- }
-}
-
-#else /* BFD_ASSEMBLER */
-
-segT
-subseg_get (segname, force_new)
- const char *segname;
- int force_new;
+subseg_get (const char *segname, int force_new)
{
segT secptr;
segment_info_type *seginfo;
else
secptr = bfd_make_section_anyway (stdoutput, segname);
+#ifdef obj_sec_set_private_data
+ obj_sec_set_private_data (stdoutput, secptr);
+#endif
+
seginfo = seg_info (secptr);
if (! seginfo)
{
/* Check whether output_section is set first because secptr may
- be bfd_abs_section_ptr. */
+ be bfd_abs_section_ptr. */
if (secptr->output_section != secptr)
secptr->output_section = secptr;
seginfo = (segment_info_type *) xmalloc (sizeof (*seginfo));
}
segT
-subseg_new (segname, subseg)
- const char *segname;
- subsegT subseg;
+subseg_new (const char *segname, subsegT subseg)
{
segT secptr;
segment_info_type *seginfo;
/* Like subseg_new, except a new section is always created, even if
a section with that name already exists. */
segT
-subseg_force_new (segname, subseg)
- const char *segname;
- subsegT subseg;
+subseg_force_new (const char *segname, subsegT subseg)
{
segT secptr;
segment_info_type *seginfo;
}
void
-subseg_set (secptr, subseg)
- segT secptr;
- subsegT subseg;
+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
/* Get the gas information we are storing for a section. */
segment_info_type *
-seg_info (sec)
- segT sec;
+seg_info (segT sec)
{
if (sec == bfd_abs_section_ptr)
return abs_seg_info;
}
symbolS *
-section_symbol (sec)
- segT sec;
+section_symbol (segT sec)
{
segment_info_type *seginfo = seg_info (sec);
symbolS *s;
abort ();
if (seginfo->sym)
return seginfo->sym;
- s = symbol_find (sec->name);
- if (!s)
- {
+
#ifndef EMIT_SECTION_SYMBOLS
#define EMIT_SECTION_SYMBOLS 1
#endif
- if (EMIT_SECTION_SYMBOLS
-#ifdef BFD_ASSEMBLER
- && symbol_table_frozen
-#endif
- )
- s = symbol_new (sec->name, sec, 0, &zero_address_frag);
- else
- s = symbol_create (sec->name, sec, 0, &zero_address_frag);
- S_CLEAR_EXTERNAL (s);
-
- /* Use the BFD section symbol, if possible. */
- if (obj_sec_sym_ok_for_reloc (sec))
- s->bsym = sec->symbol;
+ 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;
}
-#endif /* BFD_ASSEMBLER */
+/* 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;
+ fprintf (file, "frag chains:\n");
+ for (frchp = frchain_root; frchp; frchp = frchp->frch_next)
+ {
+ int count = 0;
+ fragS *fragp;
+
+ /* If frch_subseg is non-zero, it's probably been chained onto
+ the end of a previous subsection. Don't count it again. */
+ if (frchp->frch_subseg != 0)
+ continue;
+
+ /* Skip gas-internal sections. */
+ if (segment_name (frchp->frch_seg)[0] == '*')
+ continue;
+
+ 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 (frchp->frch_seg), count);
+ }
+}
/* end of subsegs.c */
projects / deliverable / binutils-gdb.git / blobdiff