/* subsegs.c - subsegments -
- Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2004, 2005
- Free Software Foundation, Inc.
+ Copyright (C) 1987-2020 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)
+ 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,
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. */
+ Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
+ 02110-1301, USA. */
/* Segments & sub-segments. */
#include "subsegs.h"
#include "obstack.h"
-frchainS *frchain_root, *frchain_now;
+frchainS *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 (segT, subsegT);
-
static fragS dummy_frag;
-static frchainS absolute_frchain;
\f
void
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);
-#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;
}
\f
/*
* segment context correct.
*/
void
-subseg_change (register segT seg, register int subseg)
+subseg_change (segT seg, int subseg)
{
+ segment_info_type *seginfo = seg_info (seg);
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
+ if (! seginfo)
{
- know (seg == SEG_BSS);
- seg_fix_rootP = &bss_fix_root;
- seg_fix_tailP = &bss_fix_tail;
+ seginfo = XCNEW (segment_info_type);
+ seginfo->bfd_section = seg;
+ bfd_set_section_userdata (seg, seginfo);
}
-
-#endif
-#endif
}
\f
static void
subseg_set_rest (segT seg, subsegT subseg)
{
- register frchainS *frcP; /* crawl frchain chain */
- register frchainS **lastPP; /* address of last pointer */
+ 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;
- assert (frchain_now == 0
- || now_seg == undefined_section
- || now_seg == absolute_section
+ gas_assert (frchain_now == 0
|| 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;
- }
+ seginfo = seg_info (seg);
- 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;
+ /* 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)
{
- 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.
- */
+ /* 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_cfi_data = NULL;
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
-
+ newP->frch_next = frcP;
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);
+ gas_assert (frchain_now->frch_last == frag_now);
}
/*
* 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 (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);
+ const char *now_seg_name = now_seg ? bfd_section_name (now_seg) : 0;
if (!force_new
&& now_seg_name
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. */
- 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;
+ secptr->output_section = secptr;
+ seginfo = XCNEW (segment_info_type);
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;
+ bfd_set_section_userdata (secptr, seginfo);
}
return secptr;
}
subseg_new (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;
}
subseg_force_new (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;
}
#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 (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 (segT sec)
{
else
{
segT seg;
- s = symbol_find_base (sec->symbol->name, 0);
+ 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
return s;
}
-#endif /* BFD_ASSEMBLER */
-
/* Return whether the specified segment is thought to hold text. */
-#ifndef BFD_ASSEMBLER
-const char * const nontext_section_names[] = {
- ".eh_frame",
- ".gcc_except_table",
-#ifdef OBJ_COFF
-#ifndef COFF_LONG_SECTION_NAMES
- ".eh_fram",
- ".gcc_exc",
-#endif
-#endif
- NULL
-};
-#endif /* ! BFD_ASSEMBLER */
-
int
subseg_text_p (segT sec)
{
-#ifdef BFD_ASSEMBLER
- return (bfd_get_section_flags (stdoutput, sec) & SEC_CODE) != 0;
-#else /* ! BFD_ASSEMBLER */
- const char * const *p;
-
- if (sec == data_section || sec == bss_section || sec == absolute_section)
- return 0;
-
- for (p = nontext_section_names; *p != NULL; ++p)
- {
- if (strcmp (segment_name (sec), *p) == 0)
- return 0;
-
-#ifdef obj_segment_name
- if (strcmp (obj_segment_name (sec), *p) == 0)
- return 0;
-#endif
- }
-
- return 1;
-
-#endif /* ! BFD_ASSEMBLER */
+ return (bfd_section_flags (sec) & SEC_CODE) != 0;
}
/* Return non zero if SEC has at least one byte of data. It is
if (!seginfo)
return 0;
-
+
for (chain = seginfo->frchainP; chain; chain = chain->frch_next)
{
for (frag = chain->frch_root; frag; frag = frag->fr_next)
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 (frchp = frchain_root; frchp; frchp = frchp->frch_next)
+ for (s = stdoutput->sections; s; s = s->next)
{
- int count = 0;
- fragS *fragp;
+ segment_info_type *seginfo;
- /* 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)
+ /* Skip gas-internal sections. */
+ if (segment_name (s)[0] == '*')
continue;
- /* Skip gas-internal sections. */
- if (segment_name (frchp->frch_seg)[0] == '*')
+ seginfo = seg_info (s);
+ if (!seginfo)
continue;
- for (fragp = frchp->frch_root; fragp; fragp = fragp->fr_next)
+ for (frchp = seginfo->frchainP; frchp; frchp = frchp->frch_next)
{
- count++;
+ 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);
}
- fprintf (file, "\n");
- fprintf (file, "\t%p %-10s\t%10d frags\n", (void *) frchp,
- segment_name (frchp->frch_seg), count);
}
}
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