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authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
commit252b5132c753830d5fd56823373aed85f2a0db63 (patch)
tree1af963bfd8d3e55167b81def4207f175eaff3a56 /gas/subsegs.c
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19990502 sourceware importbinu_ss_19990502
Diffstat (limited to 'gas/subsegs.c')
-rw-r--r--gas/subsegs.c618
1 files changed, 618 insertions, 0 deletions
diff --git a/gas/subsegs.c b/gas/subsegs.c
new file mode 100644
index 0000000..bdf2868
--- /dev/null
+++ b/gas/subsegs.c
@@ -0,0 +1,618 @@
+/* subsegs.c - subsegments -
+ Copyright (C) 1987, 90, 91, 92, 93, 94, 95, 96, 1997
+ 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 2, 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, 59 Temple Place - Suite 330, Boston, MA
+ 02111-1307, USA. */
+
+/*
+ * Segments & sub-segments.
+ */
+
+#include "as.h"
+
+#include "subsegs.h"
+#include "obstack.h"
+
+frchainS *frchain_root, *frchain_now;
+
+static struct obstack frchains;
+
+#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 *const seg_name[] =
+{
+ "absolute",
+#ifdef MANY_SEGMENTS
+ "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9",
+ "e10", "e11", "e12", "e13", "e14", "e15", "e16", "e17", "e18", "e19",
+ "e20", "e21", "e22", "e23", "e24", "e25", "e26", "e27", "e28", "e29",
+ "e30", "e31", "e32", "e33", "e34", "e35", "e36", "e37", "e38", "e39",
+#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 */
+
+/* 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 PARAMS ((segT, subsegT));
+
+static fragS dummy_frag;
+
+static frchainS absolute_frchain;
+
+void
+subsegs_begin ()
+{
+ /* 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);
+#endif
+
+ obstack_begin (&frchains, chunksize);
+#if __GNUC__ >= 2
+ obstack_alignment_mask (&frchains) = __alignof__ (frchainS) - 1;
+#endif
+
+ frchain_root = NULL;
+ frchain_now = NULL; /* Warn new_subseg() that we are booting. */
+
+ frag_now = &dummy_frag;
+
+#ifndef BFD_ASSEMBLER
+ 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 */
+
+ absolute_frchain.frch_seg = absolute_section;
+ absolute_frchain.frch_subseg = 0;
+#ifdef BFD_ASSEMBLER
+ absolute_frchain.fix_root = absolute_frchain.fix_tail = 0;
+#endif
+ absolute_frchain.frch_frag_now = &zero_address_frag;
+ absolute_frchain.frch_root = absolute_frchain.frch_last = &zero_address_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 (seg, subseg)
+ register segT seg;
+ register int subseg;
+{
+ now_seg = seg;
+ now_subseg = subseg;
+
+ if (now_seg == absolute_section)
+ return;
+
+#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
+ {
+ know (seg == SEG_BSS);
+ seg_fix_rootP = &bss_fix_root;
+ seg_fix_tailP = &bss_fix_tail;
+ }
+
+#endif
+#endif
+}
+
+static void
+subseg_set_rest (seg, subseg)
+ segT seg;
+ subsegT subseg;
+{
+ register frchainS *frcP; /* crawl frchain chain */
+ register frchainS **lastPP; /* address of last pointer */
+ frchainS *newP; /* address of new frchain */
+
+ 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)
+ {
+ frchain_now = &absolute_frchain;
+ frag_now = &zero_address_frag;
+ return;
+ }
+
+ 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.
+ * If we need to make a frchainS, link it into correct
+ * position of chain rooted in frchain_root.
+ */
+ for (frcP = *(lastPP = &frchain_root);
+ frcP && frcP->frch_seg <= seg;
+ frcP = *(lastPP = &frcP->frch_next))
+ {
+ if (frcP->frch_seg == seg
+ && frcP->frch_subseg >= subseg)
+ {
+ break;
+ }
+ }
+ /*
+ * frcP: Address of the 1st frchainS in correct segment with
+ * frch_subseg >= subseg.
+ * We want to either use this frchainS, or we want
+ * to insert a new frchainS just before it.
+ *
+ * If frcP==NULL, then we are at the end of the chain
+ * of frchainS-s. A NULL frcP means we fell off the end
+ * of the chain looking for a
+ * frch_subseg >= subseg, so we
+ * must make a new frchainS.
+ *
+ * If we ever maintain a pointer to
+ * the last frchainS in the chain, we change that pointer
+ * ONLY when frcP==NULL.
+ *
+ * lastPP: Address of the pointer with value frcP;
+ * Never NULL.
+ * May point to frchain_root.
+ *
+ */
+ if (!frcP
+ || (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 (&frchains, sizeof (frchainS));
+ newP->frch_subseg = subseg;
+ newP->frch_seg = seg;
+#ifdef BFD_ASSEMBLER
+ newP->fix_root = NULL;
+ newP->fix_tail = NULL;
+#endif
+ 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 */
+
+#ifdef BFD_ASSEMBLER
+ {
+ segment_info_type *seginfo;
+ seginfo = seg_info (seg);
+ if (seginfo && seginfo->frchainP == frcP)
+ seginfo->frchainP = newP;
+ }
+#endif
+
+ frcP = newP;
+ }
+ /*
+ * Here with frcP pointing to the frchainS for subseg.
+ */
+ frchain_now = frcP;
+ frag_now = frcP->frch_frag_now;
+
+ 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.
+ * 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
+ || seg == SEG_ABSOLUTE);
+#endif
+
+ if (seg != now_seg || subseg != now_subseg)
+ { /* we just changed sub-segments */
+ subseg_set_rest (seg, subseg);
+ }
+ mri_common_symbol = NULL;
+}
+
+#else /* BFD_ASSEMBLER */
+
+segT
+subseg_get (segname, force_new)
+ 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)
+ {
+ /* Check whether output_section is set first because secptr may
+ be bfd_abs_section_ptr. */
+ if (secptr->output_section != secptr)
+ secptr->output_section = secptr;
+ seginfo = (segment_info_type *) xmalloc (sizeof (*seginfo));
+ memset ((PTR) seginfo, 0, sizeof (*seginfo));
+ seginfo->fix_root = NULL;
+ seginfo->fix_tail = NULL;
+ seginfo->bfd_section = secptr;
+ if (secptr == bfd_abs_section_ptr)
+ abs_seg_info = seginfo;
+ else if (secptr == bfd_und_section_ptr)
+ und_seg_info = seginfo;
+ else
+ bfd_set_section_userdata (stdoutput, secptr, (PTR) seginfo);
+ seginfo->frchainP = NULL;
+ seginfo->lineno_list_head = seginfo->lineno_list_tail = NULL;
+ seginfo->sym = NULL;
+ seginfo->dot = NULL;
+ }
+ return secptr;
+}
+
+segT
+subseg_new (segname, subseg)
+ const char *segname;
+ subsegT subseg;
+{
+ segT secptr;
+ segment_info_type *seginfo;
+
+ secptr = subseg_get (segname, 0);
+ subseg_set_rest (secptr, subseg);
+ seginfo = seg_info (secptr);
+ if (! seginfo->frchainP)
+ seginfo->frchainP = frchain_now;
+ 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 (segname, subseg)
+ const char *segname;
+ subsegT subseg;
+{
+ segT secptr;
+ segment_info_type *seginfo;
+
+ secptr = subseg_get (segname, 1);
+ subseg_set_rest (secptr, subseg);
+ seginfo = seg_info (secptr);
+ if (! seginfo->frchainP)
+ seginfo->frchainP = frchain_now;
+ return secptr;
+}
+
+void
+subseg_set (secptr, subseg)
+ 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
+
+/* Get the gas information we are storing for a section. */
+
+segment_info_type *
+seg_info (sec)
+ segT sec;
+{
+ if (sec == bfd_abs_section_ptr)
+ return abs_seg_info;
+ else if (sec == bfd_und_section_ptr)
+ return und_seg_info;
+ else
+ return (segment_info_type *) bfd_get_section_userdata (stdoutput, sec);
+}
+
+symbolS *
+section_symbol (sec)
+ 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
+#ifdef BFD_ASSEMBLER
+ || symbol_table_frozen
+#endif
+ )
+ {
+ /* Here we know it won't be going into the symbol table. */
+ s = symbol_create (sec->name, sec, 0, &zero_address_frag);
+ }
+ else
+ {
+ s = symbol_find_base (sec->name, 0);
+ if (s == NULL)
+ s = symbol_new (sec->name, sec, 0, &zero_address_frag);
+ else
+ {
+ if (S_GET_SEGMENT (s) == undefined_section)
+ {
+ S_SET_SEGMENT (s, sec);
+ s->sy_frag = &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;
+
+ seginfo->sym = s;
+ return s;
+}
+
+#endif /* BFD_ASSEMBLER */
+
+void
+subsegs_print_statistics (file)
+ 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)
+ {
+#if 0
+ switch (fragp->fr_type)
+ {
+ case rs_fill:
+ fprintf (file, "f"); break;
+ case rs_align:
+ fprintf (file, "a"); break;
+ case rs_align_code:
+ fprintf (file, "c"); break;
+ case rs_org:
+ fprintf (file, "o"); break;
+ case rs_machine_dependent:
+ fprintf (file, "m"); break;
+ case rs_space:
+ fprintf (file, "s"); break;
+ case 0:
+ fprintf (file, "0"); break;
+ default:
+ fprintf (file, "?"); break;
+ }
+#endif
+ count++;
+ }
+ fprintf (file, "\n");
+ fprintf (file, "\t%p %-10s\t%10d frags\n", frchp,
+ segment_name (frchp->frch_seg), count);
+ }
+}
+
+/* end of subsegs.c */