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-rw-r--r--binutils-2.25/gas/subsegs.c330
1 files changed, 330 insertions, 0 deletions
diff --git a/binutils-2.25/gas/subsegs.c b/binutils-2.25/gas/subsegs.c
new file mode 100644
index 00000000..69f837b2
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+++ b/binutils-2.25/gas/subsegs.c
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+/* subsegs.c - subsegments -
+ Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009
+ 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 (register segT seg, register int subseg)
+{
+ segment_info_type *seginfo = seg_info (seg);
+ now_seg = seg;
+ now_subseg = subseg;
+
+ if (! seginfo)
+ {
+ seginfo = (segment_info_type *) xcalloc (1, sizeof (*seginfo));
+ 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 = (segment_info_type *) xcalloc (1, sizeof (*seginfo));
+ 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;
+
+ 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 */
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