Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 2811 insertions, 0 deletions

diff --git a/gdb/xcoffread.c b/gdb/xcoffread.c
new file mode 100644
index 0000000..0cf9371
--- /dev/null
+++ b/gdb/xcoffread.c
@@ -0,0 +1,2811 @@
+/* Read AIX xcoff symbol tables and convert to internal format, for GDB.
+   Copyright 1986, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 1997
+   	     Free Software Foundation, Inc.
+   Derived from coffread.c, dbxread.c, and a lot of hacking.
+   Contributed by IBM Corporation.
+
+This file is part of GDB.
+
+This program 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 of the License, or
+(at your option) any later version.
+
+This program 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 this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "bfd.h"
+
+#include <sys/types.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include "gdb_string.h"
+
+#include <sys/param.h>
+#ifndef	NO_SYS_FILE
+#include <sys/file.h>
+#endif
+#include "gdb_stat.h"
+
+#include "coff/internal.h"
+#include "libcoff.h"		/* FIXME, internal data from BFD */
+#include "coff/rs6000.h"
+
+#include "symtab.h"
+#include "gdbtypes.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "buildsym.h"
+#include "stabsread.h"
+#include "expression.h"
+#include "language.h"		/* Needed inside partial-stab.h */
+#include "complaints.h"
+
+#include "gdb-stabs.h"
+
+/* For interface with stabsread.c.  */
+#include "aout/stab_gnu.h"
+
+/* For interface with partial-stab.h.  */
+#define N_UNDF	0	/* Undefined symbol */
+#undef N_ABS
+#define N_ABS 2
+#define N_TEXT 	4	/* Text sym -- defined at offset in text seg */
+#define N_DATA 	6	/* Data sym -- defined at offset in data seg */
+#define N_BSS 	8	/* BSS  sym -- defined at offset in zero'd seg */
+#define	N_COMM	0x12	/* Common symbol (visible after shared lib dynlink) */
+#define N_FN	0x1f	/* File name of .o file */
+#define	N_FN_SEQ 0x0C	/* N_FN from Sequent compilers (sigh) */
+/* Note: N_EXT can only be usefully OR-ed with N_UNDF, N_ABS, N_TEXT,
+   N_DATA, or N_BSS.  When the low-order bit of other types is set,
+   (e.g. N_WARNING versus N_FN), they are two different types.  */
+#define N_EXT 	1	/* External symbol (as opposed to local-to-this-file) */
+#define N_INDR 0x0a
+
+/* The following symbols refer to set elements.
+   All the N_SET[ATDB] symbols with the same name form one set.
+   Space is allocated for the set in the text section, and each set
+   elements value is stored into one word of the space.
+   The first word of the space is the length of the set (number of elements).
+
+   The address of the set is made into an N_SETV symbol
+   whose name is the same as the name of the set.
+   This symbol acts like a N_DATA global symbol
+   in that it can satisfy undefined external references.  */
+
+/* These appear as input to LD, in a .o file.  */
+#define	N_SETA	0x14		/* Absolute set element symbol */
+#define	N_SETT	0x16		/* Text set element symbol */
+#define	N_SETD	0x18		/* Data set element symbol */
+#define	N_SETB	0x1A		/* Bss set element symbol */
+
+/* This is output from LD.  */
+#define N_SETV	0x1C		/* Pointer to set vector in data area.  */
+
+/* We put a pointer to this structure in the read_symtab_private field
+   of the psymtab.  */
+
+struct symloc {
+
+  /* First symbol number for this file.  */
+
+  int first_symnum;
+
+  /* Number of symbols in the section of the symbol table devoted to
+     this file's symbols (actually, the section bracketed may contain
+     more than just this file's symbols).  If numsyms is 0, the only
+     reason for this thing's existence is the dependency list.  Nothing
+     else will happen when it is read in.  */
+
+  int numsyms;
+
+  /* Position of the start of the line number information for this psymtab.  */
+  unsigned int lineno_off;
+};
+
+/* Remember what we deduced to be the source language of this psymtab. */
+
+static enum language psymtab_language = language_unknown;
+
+
+/* Simplified internal version of coff symbol table information */
+
+struct coff_symbol {
+  char *c_name;
+  int c_symnum;		/* symbol number of this entry */
+  int c_naux;		/* 0 if syment only, 1 if syment + auxent */
+  long c_value;
+  unsigned char c_sclass;
+  int c_secnum;
+  unsigned int c_type;
+};
+
+/* last function's saved coff symbol `cs' */
+
+static struct coff_symbol fcn_cs_saved;
+
+static bfd *symfile_bfd;
+
+/* Core address of start and end of text of current source file.
+   This is calculated from the first function seen after a C_FILE
+   symbol. */
+
+
+static CORE_ADDR cur_src_end_addr;
+
+/* Core address of the end of the first object file.  */
+
+static CORE_ADDR first_object_file_end;
+
+/* initial symbol-table-debug-string vector length */
+
+#define	INITIAL_STABVECTOR_LENGTH	40
+
+/* Nonzero if within a function (so symbols should be local,
+   if nothing says specifically).  */
+
+int within_function;
+
+/* Size of a COFF symbol.  I think it is always 18, so I'm not sure
+   there is any reason not to just use a #define, but might as well
+   ask BFD for the size and store it here, I guess.  */
+
+static unsigned	local_symesz;
+
+struct coff_symfile_info {
+  file_ptr min_lineno_offset;		/* Where in file lowest line#s are */
+  file_ptr max_lineno_offset;		/* 1+last byte of line#s in file */
+
+  /* Pointer to the string table.  */
+  char *strtbl;
+
+  /* Pointer to debug section.  */
+  char *debugsec;
+
+  /* Pointer to the a.out symbol table.  */
+  char *symtbl;
+
+  /* Number of symbols in symtbl.  */
+  int symtbl_num_syms;
+
+  /* Offset in data section to TOC anchor.  */
+  CORE_ADDR toc_offset;
+};
+
+static struct complaint storclass_complaint =
+  {"Unexpected storage class: %d", 0, 0};
+
+static struct complaint bf_notfound_complaint =
+  {"line numbers off, `.bf' symbol not found", 0, 0};
+
+static struct complaint ef_complaint = 
+  {"Mismatched .ef symbol ignored starting at symnum %d", 0, 0};
+
+static struct complaint eb_complaint = 
+  {"Mismatched .eb symbol ignored starting at symnum %d", 0, 0};
+
+static void
+xcoff_initial_scan PARAMS ((struct objfile *, struct section_offsets *, int));
+
+static void
+scan_xcoff_symtab PARAMS ((struct section_offsets *, struct objfile *));
+
+static char *
+xcoff_next_symbol_text PARAMS ((struct objfile *));
+
+static void
+record_include_begin PARAMS ((struct coff_symbol *));
+
+static void
+enter_line_range PARAMS ((struct subfile *, unsigned, unsigned,
+			  CORE_ADDR, CORE_ADDR, unsigned *));
+
+static void
+init_stringtab PARAMS ((bfd *, file_ptr, struct objfile *));
+
+static void
+xcoff_symfile_init PARAMS ((struct objfile *));
+
+static void
+xcoff_new_init PARAMS ((struct objfile *));
+
+static void
+xcoff_symfile_finish PARAMS ((struct objfile *));
+
+static struct section_offsets *
+xcoff_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR));
+
+static void
+find_linenos PARAMS ((bfd *, sec_ptr, PTR));
+
+static char *
+coff_getfilename PARAMS ((union internal_auxent *, struct objfile *));
+
+static void
+read_symbol PARAMS ((struct internal_syment *, int));
+
+static int
+read_symbol_lineno PARAMS ((int));
+
+static int
+read_symbol_nvalue PARAMS ((int));
+
+static struct symbol *
+process_xcoff_symbol PARAMS ((struct coff_symbol *, struct objfile *));
+
+static void
+read_xcoff_symtab PARAMS ((struct partial_symtab *));
+
+#if 0
+static void
+add_stab_to_list PARAMS ((char *, struct pending_stabs **));
+#endif
+
+static int
+compare_lte PARAMS ((const void *, const void *));
+
+static struct linetable *
+arrange_linetable PARAMS ((struct linetable *));
+
+static void
+record_include_end PARAMS ((struct coff_symbol *));
+
+static void
+process_linenos PARAMS ((CORE_ADDR, CORE_ADDR));
+
+
+/* Translate from a COFF section number (target_index) to a SECT_OFF_*
+   code.  */
+static int secnum_to_section PARAMS ((int, struct objfile *));
+static asection * secnum_to_bfd_section PARAMS ((int, struct objfile *));
+
+struct find_targ_sec_arg {
+  int targ_index;
+  int *resultp;
+  asection **bfd_sect;
+};
+
+static void find_targ_sec PARAMS ((bfd *, asection *, void *));
+
+static void find_targ_sec (abfd, sect, obj)
+     bfd *abfd;
+     asection *sect;
+     PTR obj;
+{
+  struct find_targ_sec_arg *args = (struct find_targ_sec_arg *)obj;
+  if (sect->target_index == args->targ_index)
+    {
+      /* This is the section.  Figure out what SECT_OFF_* code it is.  */
+      if (bfd_get_section_flags (abfd, sect) & SEC_CODE)
+	*args->resultp = SECT_OFF_TEXT;
+      else if (bfd_get_section_flags (abfd, sect) & SEC_LOAD)
+	*args->resultp = SECT_OFF_DATA;
+      else
+	*args->resultp = SECT_OFF_BSS;
+      *args->bfd_sect = sect;
+    }
+}
+
+/* Return the section number (SECT_OFF_*) that CS points to.  */
+static int
+secnum_to_section (secnum, objfile)
+     int secnum;
+     struct objfile *objfile;
+{
+  int off = SECT_OFF_TEXT;
+  asection *sect = NULL;
+  struct find_targ_sec_arg args;
+  args.targ_index = secnum;
+  args.resultp = &off;
+  args.bfd_sect = &sect;
+  bfd_map_over_sections (objfile->obfd, find_targ_sec, &args);
+  return off;
+}
+
+/* Return the BFD section that CS points to.  */
+static asection *
+secnum_to_bfd_section (secnum, objfile)
+     int secnum;
+     struct objfile *objfile;
+{
+  int off = SECT_OFF_TEXT;
+  asection *sect = NULL;
+  struct find_targ_sec_arg args;
+  args.targ_index = secnum;
+  args.resultp = &off;
+  args.bfd_sect = &sect;
+  bfd_map_over_sections (objfile->obfd, find_targ_sec, &args);
+  return sect;
+}
+
+/* add a given stab string into given stab vector. */
+
+#if 0
+
+static void
+add_stab_to_list (stabname, stabvector)
+char *stabname;
+struct pending_stabs **stabvector;
+{
+  if ( *stabvector == NULL) {
+    *stabvector = (struct pending_stabs *)
+	xmalloc (sizeof (struct pending_stabs) + 
+			INITIAL_STABVECTOR_LENGTH * sizeof (char*));
+    (*stabvector)->count = 0;
+    (*stabvector)->length = INITIAL_STABVECTOR_LENGTH;
+  }
+  else if ((*stabvector)->count >= (*stabvector)->length) {
+    (*stabvector)->length += INITIAL_STABVECTOR_LENGTH;
+    *stabvector = (struct pending_stabs *)
+	xrealloc ((char *) *stabvector, sizeof (struct pending_stabs) + 
+	(*stabvector)->length * sizeof (char*));
+  }
+  (*stabvector)->stab [(*stabvector)->count++] = stabname;
+}
+
+#endif
+
+
+/* Linenos are processed on a file-by-file basis.
+
+   Two reasons:
+
+    1) xlc (IBM's native c compiler) postpones static function code
+       emission to the end of a compilation unit. This way it can
+       determine if those functions (statics) are needed or not, and
+       can do some garbage collection (I think). This makes line
+       numbers and corresponding addresses unordered, and we end up
+       with a line table like:
+       
+
+		lineno	addr
+        foo()	  10	0x100
+		  20	0x200
+		  30	0x300
+
+	foo3()	  70	0x400
+		  80	0x500
+		  90	0x600
+
+	static foo2()
+		  40	0x700
+		  50	0x800
+		  60	0x900		
+
+	and that breaks gdb's binary search on line numbers, if the
+	above table is not sorted on line numbers. And that sort
+	should be on function based, since gcc can emit line numbers
+	like:
+	
+		10	0x100	- for the init/test part of a for stmt.
+		20	0x200
+		30	0x300
+		10	0x400	- for the increment part of a for stmt.
+
+	arrange_linetable() will do this sorting.		
+
+     2)	aix symbol table might look like:
+
+		c_file		// beginning of a new file
+		.bi		// beginning of include file
+		.ei		// end of include file
+		.bi
+		.ei
+
+	basically, .bi/.ei pairs do not necessarily encapsulate
+	their scope. They need to be recorded, and processed later
+	on when we come the end of the compilation unit.
+	Include table (inclTable) and process_linenos() handle
+	that.  */
+
+/* compare line table entry addresses. */
+
+static int
+compare_lte (lte1p, lte2p)
+     const void *lte1p;
+     const void *lte2p;
+{
+  struct linetable_entry *lte1 = (struct linetable_entry *) lte1p;
+  struct linetable_entry *lte2 = (struct linetable_entry *) lte2p;
+  return lte1->pc - lte2->pc;
+}
+
+/* Given a line table with function entries are marked, arrange its functions
+   in ascending order and strip off function entry markers and return it in
+   a newly created table. If the old one is good enough, return the old one. */
+/* FIXME: I think all this stuff can be replaced by just passing
+   sort_linevec = 1 to end_symtab.  */
+
+static struct linetable *
+arrange_linetable (oldLineTb)
+     struct linetable *oldLineTb;			/* old linetable */
+{
+  int ii, jj, 
+      newline, 					/* new line count */
+      function_count;				/* # of functions */
+
+  struct linetable_entry *fentry;		/* function entry vector */
+  int fentry_size;				/* # of function entries */
+  struct linetable *newLineTb;			/* new line table */
+
+#define NUM_OF_FUNCTIONS 20
+
+  fentry_size = NUM_OF_FUNCTIONS;
+  fentry = (struct linetable_entry*)
+    xmalloc (fentry_size * sizeof (struct linetable_entry));
+
+  for (function_count=0, ii=0; ii <oldLineTb->nitems; ++ii) {
+
+    if (oldLineTb->item[ii].line == 0) {	/* function entry found. */
+
+      if (function_count >= fentry_size) {	/* make sure you have room. */
+	fentry_size *= 2;
+	fentry = (struct linetable_entry*) 
+	  xrealloc (fentry, fentry_size * sizeof (struct linetable_entry));
+      }
+      fentry[function_count].line = ii;
+      fentry[function_count].pc = oldLineTb->item[ii].pc;
+      ++function_count;
+    }
+  }
+
+  if (function_count == 0) {
+    free (fentry);
+    return oldLineTb;
+  }
+  else if (function_count > 1)
+    qsort (fentry, function_count, sizeof(struct linetable_entry), compare_lte);
+
+  /* allocate a new line table. */
+  newLineTb = (struct linetable *)
+    xmalloc
+      (sizeof (struct linetable) + 
+       (oldLineTb->nitems - function_count) * sizeof (struct linetable_entry));
+
+  /* if line table does not start with a function beginning, copy up until
+     a function begin. */
+
+  newline = 0;
+  if (oldLineTb->item[0].line != 0)
+    for (newline=0; 
+	newline < oldLineTb->nitems && oldLineTb->item[newline].line; ++newline)
+      newLineTb->item[newline] = oldLineTb->item[newline];
+
+  /* Now copy function lines one by one. */
+
+  for (ii=0; ii < function_count; ++ii) {
+    for (jj = fentry[ii].line + 1;
+	         jj < oldLineTb->nitems && oldLineTb->item[jj].line != 0; 
+							 ++jj, ++newline)
+      newLineTb->item[newline] = oldLineTb->item[jj];
+  }
+  free (fentry);
+  newLineTb->nitems = oldLineTb->nitems - function_count;
+  return newLineTb;  
+}     
+
+/* include file support: C_BINCL/C_EINCL pairs will be kept in the 
+   following `IncludeChain'. At the end of each symtab (end_symtab),
+   we will determine if we should create additional symtab's to
+   represent if (the include files. */
+
+
+typedef struct _inclTable {
+  char		*name;				/* include filename */
+
+  /* Offsets to the line table.  end points to the last entry which is
+     part of this include file.  */
+  int		begin, end;
+  
+  struct subfile *subfile;
+  unsigned	funStartLine;			/* start line # of its function */
+} InclTable;
+
+#define	INITIAL_INCLUDE_TABLE_LENGTH	20
+static InclTable  *inclTable;			/* global include table */
+static int	  inclIndx;			/* last entry to table */
+static int	  inclLength;			/* table length */
+static int	  inclDepth;			/* nested include depth */
+
+static void allocate_include_entry PARAMS ((void));
+
+static void
+record_include_begin (cs)
+struct coff_symbol *cs;
+{
+  if (inclDepth)
+    {
+      /* In xcoff, we assume include files cannot be nested (not in .c files
+	 of course, but in corresponding .s files.).  */
+
+      /* This can happen with old versions of GCC.
+	 GCC 2.3.3-930426 does not exhibit this on a test case which
+	 a user said produced the message for him.  */
+      static struct complaint msg = {"Nested C_BINCL symbols", 0, 0};
+      complain (&msg);
+    }
+  ++inclDepth;
+
+  allocate_include_entry ();
+
+  inclTable [inclIndx].name  = cs->c_name;
+  inclTable [inclIndx].begin = cs->c_value;
+}
+
+static void
+record_include_end (cs)
+struct coff_symbol *cs;
+{
+  InclTable *pTbl;  
+
+  if (inclDepth == 0)
+    {
+      static struct complaint msg = {"Mismatched C_BINCL/C_EINCL pair", 0, 0};
+      complain (&msg);
+    }
+
+  allocate_include_entry ();
+
+  pTbl = &inclTable [inclIndx];
+  pTbl->end = cs->c_value;
+
+  --inclDepth;
+  ++inclIndx;
+}
+
+static void
+allocate_include_entry ()
+{
+  if (inclTable == NULL)
+    {
+      inclTable = (InclTable *) 
+	xmalloc (sizeof (InclTable) * INITIAL_INCLUDE_TABLE_LENGTH);
+      memset (inclTable,
+	      '\0', sizeof (InclTable) * INITIAL_INCLUDE_TABLE_LENGTH);
+      inclLength = INITIAL_INCLUDE_TABLE_LENGTH;
+      inclIndx = 0;
+    }
+  else if (inclIndx >= inclLength)
+    {
+      inclLength += INITIAL_INCLUDE_TABLE_LENGTH;
+      inclTable = (InclTable *) 
+	xrealloc (inclTable, sizeof (InclTable) * inclLength);
+      memset (inclTable + inclLength - INITIAL_INCLUDE_TABLE_LENGTH, 
+	      '\0', sizeof (InclTable)*INITIAL_INCLUDE_TABLE_LENGTH);
+    }
+}
+
+/* Global variable to pass the psymtab down to all the routines involved
+   in psymtab to symtab processing.  */
+static struct partial_symtab *this_symtab_psymtab;
+
+/* given the start and end addresses of a compilation unit (or a csect,
+   at times) process its lines and create appropriate line vectors. */
+
+static void
+process_linenos (start, end)
+     CORE_ADDR start, end;
+{
+  int offset, ii;
+  file_ptr max_offset =
+    ((struct coff_symfile_info *)this_symtab_psymtab->objfile->sym_private)
+      ->max_lineno_offset;
+
+  /* subfile structure for the main compilation unit.  */
+  struct subfile main_subfile;
+
+  /* In the main source file, any time we see a function entry, we
+     reset this variable to function's absolute starting line number.
+     All the following line numbers in the function are relative to
+     this, and we record absolute line numbers in record_line().  */
+
+  unsigned int main_source_baseline = 0;
+
+  unsigned *firstLine;
+
+  offset =
+    ((struct symloc *)this_symtab_psymtab->read_symtab_private)->lineno_off;
+  if (offset == 0)
+    goto return_after_cleanup;
+
+  memset (&main_subfile, '\0', sizeof (main_subfile));
+
+  if (inclIndx == 0)
+    /* All source lines were in the main source file. None in include files. */
+
+    enter_line_range (&main_subfile, offset, 0, start, end, 
+    						&main_source_baseline);
+
+  else
+    {
+      /* There was source with line numbers in include files.  */
+      main_source_baseline = 0;
+      for (ii=0; ii < inclIndx; ++ii)
+	{
+	  struct subfile *tmpSubfile;
+
+	  /* If there is main file source before include file, enter it.  */
+	  if (offset < inclTable[ii].begin)
+	    {
+	      enter_line_range
+		(&main_subfile, offset, inclTable[ii].begin - LINESZ,
+		 start, 0, &main_source_baseline);
+	    }
+
+	  /* Have a new subfile for the include file.  */
+
+	  tmpSubfile = inclTable[ii].subfile =
+	    (struct subfile *) xmalloc (sizeof (struct subfile));
+
+	  memset (tmpSubfile, '\0', sizeof (struct subfile));
+	  firstLine = &(inclTable[ii].funStartLine);
+
+	  /* Enter include file's lines now.  */
+	  enter_line_range (tmpSubfile, inclTable[ii].begin, 
+			    inclTable[ii].end, start, 0, firstLine);
+
+	  if (offset <= inclTable[ii].end)
+	    offset = inclTable[ii].end + LINESZ;
+	}
+
+      /* All the include files' line have been processed at this point.  Now,
+	 enter remaining lines of the main file, if any left.  */
+      if (offset < max_offset + 1 - LINESZ)
+	{
+	  enter_line_range (&main_subfile, offset, 0, start, end, 
+			    &main_source_baseline);
+	}
+    }
+
+  /* Process main file's line numbers.  */
+  if (main_subfile.line_vector)
+    {
+      struct linetable *lineTb, *lv;
+
+      lv = main_subfile.line_vector;
+
+      /* Line numbers are not necessarily ordered. xlc compilation will
+	 put static function to the end. */
+
+      lineTb = arrange_linetable (lv);
+      if (lv == lineTb)
+	{
+	  current_subfile->line_vector = (struct linetable *)
+	    xrealloc (lv, (sizeof (struct linetable)
+			   + lv->nitems * sizeof (struct linetable_entry)));
+	}
+      else
+	{
+	  free (lv);
+	  current_subfile->line_vector = lineTb;
+	}
+
+      current_subfile->line_vector_length = 
+	current_subfile->line_vector->nitems;
+    }
+
+  /* Now, process included files' line numbers.  */
+
+  for (ii=0; ii < inclIndx; ++ii)
+    {
+      if ((inclTable[ii].subfile)->line_vector) /* Useless if!!! FIXMEmgo */
+	{
+	  struct linetable *lineTb, *lv;
+
+	  lv = (inclTable[ii].subfile)->line_vector;
+
+	  /* Line numbers are not necessarily ordered. xlc compilation will
+	     put static function to the end. */
+
+	  lineTb = arrange_linetable (lv);
+
+	  push_subfile ();
+
+	  /* For the same include file, we might want to have more than one
+	     subfile.  This happens if we have something like:
+
+  		......
+	        #include "foo.h"
+		......
+	 	#include "foo.h"
+		......
+
+	     while foo.h including code in it. (stupid but possible)
+	     Since start_subfile() looks at the name and uses an
+	     existing one if finds, we need to provide a fake name and
+	     fool it.  */
+
+#if 0
+	  start_subfile (inclTable[ii].name, (char*)0);
+#else
+	  {
+	    /* Pick a fake name that will produce the same results as this
+	       one when passed to deduce_language_from_filename.  Kludge on
+	       top of kludge.  */
+	    char *fakename = strrchr (inclTable[ii].name, '.');
+	    if (fakename == NULL)
+	      fakename = " ?";
+	    start_subfile (fakename, (char*)0);
+	    free (current_subfile->name);
+	  }
+	  current_subfile->name = strdup (inclTable[ii].name);
+#endif
+
+	  if (lv == lineTb)
+	    {
+	      current_subfile->line_vector =
+		(struct linetable *) xrealloc
+		  (lv, (sizeof (struct linetable)
+			+ lv->nitems * sizeof (struct linetable_entry)));
+
+	    }
+	  else
+	    {
+	      free (lv);
+	      current_subfile->line_vector = lineTb;
+	    }
+
+	  current_subfile->line_vector_length = 
+	    current_subfile->line_vector->nitems;
+	  start_subfile (pop_subfile (), (char*)0);
+	}
+    }
+
+ return_after_cleanup:
+
+  /* We don't want to keep alloc/free'ing the global include file table.  */
+  inclIndx = 0;
+
+  /* Start with a fresh subfile structure for the next file.  */
+  memset (&main_subfile, '\0', sizeof (struct subfile));
+}
+
+void
+aix_process_linenos ()
+{
+  /* process line numbers and enter them into line vector */
+  process_linenos (last_source_start_addr, cur_src_end_addr);
+}
+
+
+/* Enter a given range of lines into the line vector.
+   can be called in the following two ways:
+     enter_line_range (subfile, beginoffset, endoffset, startaddr, 0, firstLine)  or
+     enter_line_range (subfile, beginoffset, 0, startaddr, endaddr, firstLine)
+
+   endoffset points to the last line table entry that we should pay
+   attention to.  */
+
+static void
+enter_line_range (subfile, beginoffset, endoffset, startaddr, endaddr,
+		  firstLine)
+     struct subfile *subfile;
+     unsigned   beginoffset, endoffset;	/* offsets to line table */
+     CORE_ADDR  startaddr, endaddr;
+     unsigned   *firstLine;
+{
+  unsigned int curoffset;
+  CORE_ADDR addr;
+  struct external_lineno ext_lnno;
+  struct internal_lineno int_lnno;
+  unsigned int limit_offset;
+  bfd *abfd;
+
+  if (endoffset == 0 && startaddr == 0 && endaddr == 0)
+    return;
+  curoffset = beginoffset;
+  limit_offset =
+    ((struct coff_symfile_info *)this_symtab_psymtab->objfile->sym_private)
+      ->max_lineno_offset;
+
+  if (endoffset != 0)
+    {
+      if (endoffset >= limit_offset)
+	{
+	  static struct complaint msg =
+	    {"Bad line table offset in C_EINCL directive", 0, 0};
+	  complain (&msg);
+	  return;
+	}
+      limit_offset = endoffset;
+    }
+  else
+    limit_offset -= 1;
+  abfd = this_symtab_psymtab->objfile->obfd;
+
+  while (curoffset <= limit_offset)
+    {
+      bfd_seek (abfd, curoffset, SEEK_SET);
+      bfd_read (&ext_lnno, sizeof (struct external_lineno), 1, abfd);
+      bfd_coff_swap_lineno_in (abfd, &ext_lnno, &int_lnno);
+
+      /* Find the address this line represents.  */
+      addr = (int_lnno.l_lnno
+	      ? int_lnno.l_addr.l_paddr
+	      : read_symbol_nvalue (int_lnno.l_addr.l_symndx));
+      addr += ANOFFSET (this_symtab_psymtab->objfile->section_offsets,
+			SECT_OFF_TEXT);
+
+      if (addr < startaddr || (endaddr && addr >= endaddr))
+	return;
+
+      if (int_lnno.l_lnno == 0)
+	{
+	  *firstLine = read_symbol_lineno (int_lnno.l_addr.l_symndx);
+	  record_line (subfile, 0, addr);
+	  --(*firstLine);
+	}
+      else
+	record_line (subfile, *firstLine + int_lnno.l_lnno, addr);
+      curoffset += LINESZ;
+    }
+}
+
+
+/* Save the vital information for use when closing off the current file.
+   NAME is the file name the symbols came from, START_ADDR is the first
+   text address for the file, and SIZE is the number of bytes of text.  */
+
+#define complete_symtab(name, start_addr) {	\
+  last_source_file = savestring (name, strlen (name));	\
+  last_source_start_addr = start_addr;			\
+}
+
+
+/* Refill the symbol table input buffer
+   and set the variables that control fetching entries from it.
+   Reports an error if no data available.
+   This function can read past the end of the symbol table
+   (into the string table) but this does no harm.  */
+
+/* Reading symbol table has to be fast! Keep the followings as macros, rather
+   than functions. */
+
+#define	RECORD_MINIMAL_SYMBOL(NAME, ADDR, TYPE, SECTION, OBJFILE) \
+{						\
+  char *namestr;				\
+  namestr = (NAME); \
+  if (namestr[0] == '.') ++namestr; \
+  prim_record_minimal_symbol_and_info (namestr, (ADDR), (TYPE), \
+				       (char *)NULL, (SECTION), (asection *)NULL, (OBJFILE)); \
+  misc_func_recorded = 1;					\
+}
+
+
+/* xcoff has static blocks marked in `.bs', `.es' pairs. They cannot be
+   nested. At any given time, a symbol can only be in one static block.
+   This is the base address of current static block, zero if non exists. */
+   
+static int static_block_base = 0;
+
+/* Section number for the current static block.  */
+
+static int static_block_section = -1;
+
+/* true if space for symbol name has been allocated. */
+
+static int symname_alloced = 0;
+
+/* Next symbol to read.  Pointer into raw seething symbol table.  */
+
+static char *raw_symbol;
+
+/* This is the function which stabsread.c calls to get symbol
+   continuations.  */
+
+static char *
+xcoff_next_symbol_text (objfile)
+     struct objfile *objfile;
+{
+  struct internal_syment symbol;
+  static struct complaint msg =
+    {"Unexpected symbol continuation", 0, 0};
+  char *retval;
+  /* FIXME: is this the same as the passed arg? */
+  objfile = this_symtab_psymtab->objfile;
+
+  bfd_coff_swap_sym_in (objfile->obfd, raw_symbol, &symbol);
+  if (symbol.n_zeroes)
+    {
+      complain (&msg);
+
+      /* Return something which points to '\0' and hope the symbol reading
+	 code does something reasonable.  */
+      retval = "";
+    }
+  else if (symbol.n_sclass & 0x80)
+    {
+      retval =
+	((struct coff_symfile_info *)objfile->sym_private)->debugsec
+	  + symbol.n_offset;
+      raw_symbol +=
+	coff_data (objfile->obfd)->local_symesz;
+      ++symnum;
+    }
+  else
+    {
+      complain (&msg);
+
+      /* Return something which points to '\0' and hope the symbol reading
+	 code does something reasonable.  */
+      retval = "";
+    }
+  return retval;
+}
+
+/* Read symbols for a given partial symbol table.  */
+
+static void
+read_xcoff_symtab (pst)
+     struct partial_symtab *pst;
+{
+  struct objfile *objfile = pst->objfile;
+  bfd *abfd = objfile->obfd;
+  char *raw_auxptr;		/* Pointer to first raw aux entry for sym */
+  char *strtbl = ((struct coff_symfile_info *)objfile->sym_private)->strtbl;
+  char *debugsec =
+    ((struct coff_symfile_info *)objfile->sym_private)->debugsec;
+
+  struct internal_syment symbol[1];
+  union internal_auxent main_aux;
+  struct coff_symbol cs[1];
+  CORE_ADDR file_start_addr = 0;
+  CORE_ADDR file_end_addr = 0;
+
+  int next_file_symnum = -1;
+  unsigned int max_symnum;
+  int just_started = 1;
+  int depth = 0;
+  int fcn_start_addr = 0;
+
+  struct coff_symbol fcn_stab_saved;
+
+  /* fcn_cs_saved is global because process_xcoff_symbol needs it. */
+  union internal_auxent fcn_aux_saved;
+  struct context_stack *new;
+
+  char *filestring = " _start_ ";	/* Name of the current file. */
+
+  char *last_csect_name;		/* last seen csect's name and value */
+  CORE_ADDR last_csect_val;
+  int last_csect_sec;
+
+  this_symtab_psymtab = pst;
+
+  /* Get the appropriate COFF "constants" related to the file we're
+     handling. */
+  local_symesz = coff_data (abfd)->local_symesz;
+
+  last_source_file = NULL;
+  last_csect_name = 0;
+  last_csect_val = 0;
+
+  start_stabs ();
+  start_symtab (filestring, (char *)NULL, file_start_addr);
+  record_debugformat ("XCOFF");
+  symnum = ((struct symloc *)pst->read_symtab_private)->first_symnum;
+  max_symnum =
+    symnum + ((struct symloc *)pst->read_symtab_private)->numsyms;
+  first_object_file_end = 0;
+
+  raw_symbol =
+    ((struct coff_symfile_info *) objfile->sym_private)->symtbl
+      + symnum * local_symesz;
+
+  while (symnum < max_symnum)
+    {
+
+      QUIT;			/* make this command interruptable.  */
+
+      /* READ_ONE_SYMBOL (symbol, cs, symname_alloced); */
+      /* read one symbol into `cs' structure. After processing the
+	 whole symbol table, only string table will be kept in memory,
+	 symbol table and debug section of xcoff will be freed. Thus
+	 we can mark symbols with names in string table as
+	 `alloced'. */
+      {
+	int ii;
+
+	/* Swap and align the symbol into a reasonable C structure.  */
+	bfd_coff_swap_sym_in (abfd, raw_symbol, symbol);
+
+	cs->c_symnum = symnum;
+	cs->c_naux = symbol->n_numaux;
+	if (symbol->n_zeroes)
+	  {
+	    symname_alloced = 0;
+	    /* We must use the original, unswapped, name here so the name field
+	       pointed to by cs->c_name will persist throughout xcoffread.  If
+	       we use the new field, it gets overwritten for each symbol.  */
+	    cs->c_name = ((struct external_syment *)raw_symbol)->e.e_name;
+	    /* If it's exactly E_SYMNMLEN characters long it isn't
+	       '\0'-terminated.  */
+	    if (cs->c_name[E_SYMNMLEN - 1] != '\0')
+	      {
+		char *p;
+		p = obstack_alloc (&objfile->symbol_obstack, E_SYMNMLEN + 1);
+		strncpy (p, cs->c_name, E_SYMNMLEN);
+		p[E_SYMNMLEN] = '\0';
+		cs->c_name = p;
+		symname_alloced = 1;
+	      }
+	  }
+	else if (symbol->n_sclass & 0x80)
+	  {
+	    cs->c_name = debugsec + symbol->n_offset;
+	    symname_alloced = 0;
+	  }
+	else
+	  {
+	    /* in string table */
+	    cs->c_name = strtbl + (int)symbol->n_offset;
+	    symname_alloced = 1;
+	  }
+	cs->c_value = symbol->n_value;
+	cs->c_sclass = symbol->n_sclass;
+	cs->c_secnum = symbol->n_scnum;
+	cs->c_type = (unsigned)symbol->n_type;
+
+	raw_symbol += coff_data (abfd)->local_symesz;
+	++symnum;
+
+	/* Save addr of first aux entry.  */
+	raw_auxptr = raw_symbol;
+
+	/* Skip all the auxents associated with this symbol.  */
+	for (ii = symbol->n_numaux; ii; --ii)
+	  {
+	    raw_symbol += coff_data (abfd)->local_auxesz;
+	    ++symnum;
+	  }
+      }
+
+      /* if symbol name starts with ".$" or "$", ignore it. */
+      if (cs->c_name[0] == '$'
+	  || (cs->c_name[1] == '$' && cs->c_name[0] == '.'))
+	continue;
+
+      if (cs->c_symnum == next_file_symnum && cs->c_sclass != C_FILE)
+	{
+	  if (last_source_file)
+	    {
+	      pst->symtab =
+		end_symtab (cur_src_end_addr, objfile, SECT_OFF_TEXT);
+	      end_stabs ();
+	    }
+
+	  start_stabs ();
+	  start_symtab ("_globals_", (char *)NULL, (CORE_ADDR)0);
+	  record_debugformat ("XCOFF");
+	  cur_src_end_addr = first_object_file_end;
+	  /* done with all files, everything from here on is globals */
+	}
+
+      /* if explicitly specified as a function, treat is as one. */
+      if (ISFCN(cs->c_type) && cs->c_sclass != C_TPDEF)
+	{
+	  bfd_coff_swap_aux_in (abfd, raw_auxptr, cs->c_type, cs->c_sclass,
+				0, cs->c_naux, &main_aux);
+	  goto function_entry_point;
+	}
+
+      if ((cs->c_sclass == C_EXT || cs->c_sclass == C_HIDEXT)
+	  && cs->c_naux == 1)
+	{
+	  /* Dealing with a symbol with a csect entry.  */
+
+#define	CSECT(PP) ((PP)->x_csect)
+#define	CSECT_LEN(PP) (CSECT(PP).x_scnlen.l)
+#define	CSECT_ALIGN(PP) (SMTYP_ALIGN(CSECT(PP).x_smtyp))
+#define	CSECT_SMTYP(PP) (SMTYP_SMTYP(CSECT(PP).x_smtyp))
+#define	CSECT_SCLAS(PP) (CSECT(PP).x_smclas)
+
+	  /* Convert the auxent to something we can access.  */
+	  bfd_coff_swap_aux_in (abfd, raw_auxptr, cs->c_type, cs->c_sclass,
+				0, cs->c_naux, &main_aux);
+
+	  switch (CSECT_SMTYP (&main_aux))
+	    {
+
+	    case XTY_ER:
+	      /* Ignore all external references.  */
+	      continue;
+
+	    case XTY_SD:
+	      /* A section description.  */
+	      {
+		switch (CSECT_SCLAS (&main_aux))
+		  {
+
+		  case XMC_PR:
+		    {
+
+		      /* A program csect is seen.  We have to allocate one
+			 symbol table for each program csect.  Normally gdb
+			 prefers one symtab for each source file.  In case
+			 of AIX, one source file might include more than one
+			 [PR] csect, and they don't have to be adjacent in
+			 terms of the space they occupy in memory. Thus, one
+			 single source file might get fragmented in the
+			 memory and gdb's file start and end address
+			 approach does not work!  GCC (and I think xlc) seem
+			 to put all the code in the unnamed program csect.  */
+
+		      if (last_csect_name)
+			{
+			  complete_symtab (filestring, file_start_addr);
+			  cur_src_end_addr = file_end_addr;
+			  end_symtab (file_end_addr, objfile, SECT_OFF_TEXT);
+			  end_stabs ();
+			  start_stabs ();
+			  /* Give all csects for this source file the same
+			     name.  */
+			  start_symtab (filestring, NULL, (CORE_ADDR)0);
+			  record_debugformat ("XCOFF");
+			}
+
+		      /* If this is the very first csect seen,
+			 basically `__start'. */
+		      if (just_started)
+			{
+			  first_object_file_end
+			    = cs->c_value + CSECT_LEN (&main_aux);
+			  just_started = 0;
+			}
+
+		      file_start_addr =
+			cs->c_value + ANOFFSET (objfile->section_offsets,
+						SECT_OFF_TEXT);
+		      file_end_addr = file_start_addr + CSECT_LEN (&main_aux);
+
+		      if (cs->c_name && cs->c_name[0] == '.')
+			{
+			  last_csect_name = cs->c_name;
+			  last_csect_val = cs->c_value;
+			  last_csect_sec = secnum_to_section (cs->c_secnum, objfile);
+			}
+		    }
+		    continue;
+
+		    /* All other symbols are put into the minimal symbol
+		       table only.  */
+
+		  case XMC_RW:
+		    continue;
+
+		  case XMC_TC0:
+		    continue;
+
+		  case XMC_TC:
+		    continue;
+
+		  default:
+		    /* Ignore the symbol.  */
+		    continue;
+		  }
+	      }
+	      break;
+
+	    case XTY_LD:
+
+	      switch (CSECT_SCLAS (&main_aux))
+		{
+		case XMC_PR:
+		  /* a function entry point. */
+		function_entry_point:
+
+		  fcn_start_addr = cs->c_value;
+
+		  /* save the function header info, which will be used
+		     when `.bf' is seen. */
+		  fcn_cs_saved = *cs;
+		  fcn_aux_saved = main_aux;
+		  continue;
+
+		case XMC_GL:
+		  /* shared library function trampoline code entry point. */
+		  continue;
+
+		case XMC_DS:
+		  /* The symbols often have the same names as debug symbols for
+		     functions, and confuse lookup_symbol.  */
+		  continue;
+
+		default:
+		  /* xlc puts each variable in a separate csect, so we get
+		     an XTY_SD for each variable.  But gcc puts several
+		     variables in a csect, so that each variable only gets
+		     an XTY_LD. This will typically be XMC_RW; I suspect
+		     XMC_RO and XMC_BS might be possible too.
+		     These variables are put in the minimal symbol table
+		     only.  */
+		  continue;
+		}
+	      break;
+
+	    case XTY_CM:
+	      /* Common symbols are put into the minimal symbol table only.  */
+	      continue;
+
+	    default:
+	      break;
+	    }
+	}
+
+      switch (cs->c_sclass)
+	{
+
+	case C_FILE:
+
+	  /* c_value field contains symnum of next .file entry in table
+	     or symnum of first global after last .file. */
+
+	  next_file_symnum = cs->c_value;
+
+	  /* Complete symbol table for last object file containing
+	     debugging information. */
+
+	  /* Whether or not there was a csect in the previous file, we
+	     have to call `end_stabs' and `start_stabs' to reset
+	     type_vector, line_vector, etc. structures.  */
+
+	  complete_symtab (filestring, file_start_addr);
+	  cur_src_end_addr = file_end_addr;
+	  end_symtab (file_end_addr, objfile, SECT_OFF_TEXT);
+	  end_stabs ();
+
+	  /* XCOFF, according to the AIX 3.2 documentation, puts the filename
+	     in cs->c_name.  But xlc 1.3.0.2 has decided to do things the
+	     standard COFF way and put it in the auxent.  We use the auxent if
+	     the symbol is ".file" and an auxent exists, otherwise use the symbol
+	     itself.  Simple enough.  */
+	  if (!strcmp (cs->c_name, ".file") && cs->c_naux > 0)
+	    {
+	      bfd_coff_swap_aux_in (abfd, raw_auxptr, cs->c_type, cs->c_sclass,
+				    0, cs->c_naux, &main_aux);
+	      filestring = coff_getfilename (&main_aux, objfile);
+	    }
+	  else
+	    filestring = cs->c_name;
+
+	  start_stabs ();
+	  start_symtab (filestring, (char *)NULL, (CORE_ADDR)0);
+	  record_debugformat ("XCOFF");
+	  last_csect_name = 0;
+
+	  /* reset file start and end addresses. A compilation unit with no text
+	     (only data) should have zero file boundaries. */
+	  file_start_addr = file_end_addr = 0;
+	  break;
+
+	case C_FUN:
+	  fcn_stab_saved = *cs;
+	  break;
+
+	case C_FCN:
+	  if (STREQ (cs->c_name, ".bf"))
+	    {
+	      CORE_ADDR off = ANOFFSET (objfile->section_offsets,
+					SECT_OFF_TEXT);
+	      bfd_coff_swap_aux_in (abfd, raw_auxptr, cs->c_type, cs->c_sclass,
+				    0, cs->c_naux, &main_aux);
+
+	      within_function = 1;
+
+	      new = push_context (0, fcn_start_addr + off);
+
+	      new->name = define_symbol 
+		(fcn_cs_saved.c_value + off,
+		 fcn_stab_saved.c_name, 0, 0, objfile);
+	      if (new->name != NULL)
+		SYMBOL_SECTION (new->name) = SECT_OFF_TEXT;
+	    }
+	  else if (STREQ (cs->c_name, ".ef"))
+	    {
+
+	      bfd_coff_swap_aux_in (abfd, raw_auxptr, cs->c_type, cs->c_sclass,
+				    0, cs->c_naux, &main_aux);
+
+	      /* The value of .ef is the address of epilogue code;
+		 not useful for gdb.  */
+	      /* { main_aux.x_sym.x_misc.x_lnsz.x_lnno
+		 contains number of lines to '}' */
+
+	      if (context_stack_depth <= 0)
+		{		/* We attempted to pop an empty context stack */
+		  complain (&ef_complaint, cs->c_symnum);
+		  within_function = 0;
+		  break;
+		}
+	      new = pop_context ();
+	      /* Stack must be empty now.  */
+	      if (context_stack_depth > 0 || new == NULL)
+		{
+		  complain (&ef_complaint, cs->c_symnum);
+		  within_function = 0;
+		  break;
+		}
+
+	      finish_block (new->name, &local_symbols, new->old_blocks,
+			    new->start_addr,
+			    (fcn_cs_saved.c_value
+			     + fcn_aux_saved.x_sym.x_misc.x_fsize
+			     + ANOFFSET (objfile->section_offsets,
+					 SECT_OFF_TEXT)),
+			    objfile);
+	      within_function = 0;
+	    }
+	  break;
+
+	case C_BSTAT:
+	  /* Begin static block.  */
+	  {
+	    struct internal_syment symbol;
+
+	    read_symbol (&symbol, cs->c_value);
+	    static_block_base = symbol.n_value;
+	    static_block_section =
+	      secnum_to_section (symbol.n_scnum, objfile);
+	  }
+	  break;
+
+	case C_ESTAT:
+	  /* End of static block.  */
+	  static_block_base = 0;
+	  static_block_section = -1;
+	  break;
+
+	case C_ARG:
+	case C_REGPARM:
+	case C_REG:
+	case C_TPDEF:
+	case C_STRTAG:
+	case C_UNTAG:
+	case C_ENTAG:
+	  {
+	    static struct complaint msg =
+	      {"Unrecognized storage class %d.", 0, 0};
+	    complain (&msg, cs->c_sclass);
+	  }
+	  break;
+
+	case C_LABEL:
+	case C_NULL:
+	  /* Ignore these.  */
+	  break;
+
+	case C_HIDEXT:
+	case C_STAT:
+	  break;
+
+	case C_BINCL:
+	  /* beginning of include file */
+	  /* In xlc output, C_BINCL/C_EINCL pair doesn't show up in sorted
+	     order. Thus, when wee see them, we might not know enough info
+	     to process them. Thus, we'll be saving them into a table 
+	     (inclTable) and postpone their processing. */
+
+	  record_include_begin (cs);
+	  break;
+
+	case C_EINCL:
+	  /* End of include file.  */
+	  /* See the comment after case C_BINCL.  */
+	  record_include_end (cs);
+	  break;
+
+	case C_BLOCK:
+	  if (STREQ (cs->c_name, ".bb"))
+	    {
+	      depth++;
+	      new = push_context (depth,
+				  (cs->c_value
+				   + ANOFFSET (objfile->section_offsets,
+					       SECT_OFF_TEXT)));
+	    }
+	  else if (STREQ (cs->c_name, ".eb"))
+	    {
+	      if (context_stack_depth <= 0)
+		{		/* We attempted to pop an empty context stack */
+		  complain (&eb_complaint, cs->c_symnum);
+		  break;
+		}
+	      new = pop_context ();
+	      if (depth-- != new->depth)
+		{
+		  complain (&eb_complaint, cs->c_symnum);
+		  break;
+		}
+	      if (local_symbols && context_stack_depth > 0)
+		{
+		  /* Make a block for the local symbols within.  */
+		  finish_block (new->name, &local_symbols, new->old_blocks,
+				new->start_addr,
+				(cs->c_value
+				 + ANOFFSET (objfile->section_offsets,
+					     SECT_OFF_TEXT)),
+				objfile);
+		}
+	      local_symbols = new->locals;
+	    }
+	  break;
+
+	default:
+	  process_xcoff_symbol (cs, objfile);
+	  break;
+	}
+    }
+
+  if (last_source_file)
+    {
+      struct symtab *s;
+
+      complete_symtab (filestring, file_start_addr);
+      cur_src_end_addr = file_end_addr;
+      s = end_symtab (file_end_addr, objfile, SECT_OFF_TEXT);
+      /* When reading symbols for the last C_FILE of the objfile, try
+         to make sure that we set pst->symtab to the symtab for the
+         file, not to the _globals_ symtab.  I'm not sure whether this
+         actually works right or when/if it comes up.  */
+      if (pst->symtab == NULL)
+	pst->symtab = s;
+      end_stabs ();
+    }
+}
+
+#define	SYMBOL_DUP(SYMBOL1, SYMBOL2)	\
+  (SYMBOL2) = (struct symbol *)		\
+  	obstack_alloc (&objfile->symbol_obstack, sizeof (struct symbol)); \
+  *(SYMBOL2) = *(SYMBOL1);
+  
+ 
+#define	SYMNAME_ALLOC(NAME, ALLOCED)	\
+  (ALLOCED) ? (NAME) : obsavestring ((NAME), strlen (NAME), &objfile->symbol_obstack);
+
+
+static struct type *func_symbol_type;
+static struct type *var_symbol_type;
+
+/* process one xcoff symbol. */
+
+static struct symbol *
+process_xcoff_symbol (cs, objfile)
+  register struct coff_symbol *cs;
+  struct objfile *objfile;
+{
+  struct symbol onesymbol;
+  register struct symbol *sym = &onesymbol;
+  struct symbol *sym2 = NULL;
+  char *name, *pp;
+
+  int sec;
+  CORE_ADDR off;
+
+  if (cs->c_secnum < 0)
+    {
+      /* The value is a register number, offset within a frame, etc.,
+	 and does not get relocated.  */
+      off = 0;
+      sec = -1;
+    }
+  else
+    {
+      sec = secnum_to_section (cs->c_secnum, objfile);
+      off = ANOFFSET (objfile->section_offsets, sec);
+    }
+
+  name = cs->c_name;
+  if (name[0] == '.')
+    ++name;
+
+  memset (sym, '\0', sizeof (struct symbol));
+
+  /* default assumptions */
+  SYMBOL_VALUE (sym) = cs->c_value + off;
+  SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
+  SYMBOL_SECTION (sym) = secnum_to_section (cs->c_secnum, objfile);
+
+  if (ISFCN (cs->c_type))
+    {
+      /* At this point, we don't know the type of the function.  This
+	 will be patched with the type from its stab entry later on in
+	 patch_block_stabs (), unless the file was compiled without -g.  */
+
+      SYMBOL_NAME (sym) = SYMNAME_ALLOC (name, symname_alloced);
+      SYMBOL_TYPE (sym) = func_symbol_type;
+
+      SYMBOL_CLASS (sym) = LOC_BLOCK;
+      SYMBOL_DUP (sym, sym2);
+
+      if (cs->c_sclass == C_EXT)
+	add_symbol_to_list (sym2, &global_symbols);
+      else if (cs->c_sclass == C_HIDEXT || cs->c_sclass == C_STAT)
+	add_symbol_to_list (sym2, &file_symbols);
+    }
+  else
+    {
+      /* In case we can't figure out the type, provide default. */
+      SYMBOL_TYPE (sym) = var_symbol_type;
+
+      switch (cs->c_sclass)
+	{
+#if 0
+	/* The values of functions and global symbols are now resolved
+	   via the global_sym_chain in stabsread.c.  */
+	case C_FUN:
+	  if (fcn_cs_saved.c_sclass == C_EXT)
+	    add_stab_to_list (name, &global_stabs);
+	  else
+	    add_stab_to_list (name, &file_stabs);
+	  break;
+
+	case C_GSYM:
+	  add_stab_to_list (name, &global_stabs);
+	  break;
+#endif
+
+	case C_BCOMM:
+	  common_block_start (cs->c_name, objfile);
+	  break;
+
+	case C_ECOMM:
+	  common_block_end (objfile);
+	  break;
+
+	default:
+	  complain (&storclass_complaint, cs->c_sclass);
+	  /* FALLTHROUGH */
+
+	case C_DECL:
+	case C_PSYM:
+	case C_RPSYM:
+	case C_ECOML:
+	case C_LSYM:
+	case C_RSYM:
+	case C_GSYM:
+
+	  {
+	    sym = define_symbol (cs->c_value + off, cs->c_name, 0, 0, objfile);
+	    if (sym != NULL)
+	      {
+		SYMBOL_SECTION (sym) = sec;
+	      }
+	    return sym;
+	  }
+
+	case C_STSYM:
+
+	  /* For xlc (not GCC), the 'V' symbol descriptor is used for
+	     all statics and we need to distinguish file-scope versus
+	     function-scope using within_function.  We do this by
+	     changing the string we pass to define_symbol to use 'S'
+	     where we need to, which is not necessarily super-clean,
+	     but seems workable enough.  */
+
+	  if (*name == ':' || (pp = (char *) strchr(name, ':')) == NULL)
+	    return NULL;
+
+	  ++pp;
+	  if (*pp == 'V' && !within_function)
+	    *pp = 'S';
+	  sym = define_symbol ((cs->c_value
+				+ ANOFFSET (objfile->section_offsets,
+					    static_block_section)),
+			       cs->c_name, 0, 0, objfile);
+	  if (sym != NULL)
+	    {
+	      SYMBOL_VALUE (sym) += static_block_base;
+	      SYMBOL_SECTION (sym) = static_block_section;
+	    }
+	  return sym;
+
+	}
+    }
+  return sym2;
+}
+
+/* Extract the file name from the aux entry of a C_FILE symbol.
+   Result is in static storage and is only good for temporary use.  */
+
+static char *
+coff_getfilename (aux_entry, objfile)
+     union internal_auxent *aux_entry;
+     struct objfile *objfile;
+{
+  static char buffer[BUFSIZ];
+
+  if (aux_entry->x_file.x_n.x_zeroes == 0)
+    strcpy (buffer,
+	    ((struct coff_symfile_info *)objfile->sym_private)->strtbl
+	    + aux_entry->x_file.x_n.x_offset);
+  else
+    {
+      strncpy (buffer, aux_entry->x_file.x_fname, FILNMLEN);
+      buffer[FILNMLEN] = '\0';
+    }
+  return (buffer);
+}
+
+/* Set *SYMBOL to symbol number symno in symtbl.  */
+static void
+read_symbol (symbol, symno)
+     struct internal_syment *symbol;
+     int symno;
+{
+  int nsyms =
+    ((struct coff_symfile_info *)this_symtab_psymtab->objfile->sym_private)
+      ->symtbl_num_syms;
+  char *stbl = 
+    ((struct coff_symfile_info *)this_symtab_psymtab->objfile->sym_private)
+      ->symtbl;
+  if (symno < 0 || symno >= nsyms)
+    {
+      static struct complaint msg =
+	{"Invalid symbol offset", 0, 0};
+      complain (&msg);
+      symbol->n_value = 0;
+      symbol->n_scnum = -1;
+      return;
+    }
+  bfd_coff_swap_sym_in (this_symtab_psymtab->objfile->obfd,
+			stbl + (symno*local_symesz),
+			symbol);
+}
+  
+/* Get value corresponding to symbol number symno in symtbl.  */
+
+static int
+read_symbol_nvalue (symno)
+     int symno;
+{
+  struct internal_syment symbol[1];
+
+  read_symbol (symbol, symno);
+  return symbol->n_value;  
+}
+
+
+/* Find the address of the function corresponding to symno, where
+   symno is the symbol pointed to by the linetable.  */
+
+static int
+read_symbol_lineno (symno)
+     int symno;
+{
+  int nsyms =
+    ((struct coff_symfile_info *)this_symtab_psymtab->objfile->sym_private)
+      ->symtbl_num_syms;
+  char *stbl = 
+    ((struct coff_symfile_info *)this_symtab_psymtab->objfile->sym_private)
+      ->symtbl;
+  struct internal_syment symbol[1];
+  union internal_auxent main_aux[1];
+
+  if (symno < 0)
+    {
+      complain (&bf_notfound_complaint);
+      return 0;
+    }
+
+  /* Note that just searching for a short distance (e.g. 50 symbols)
+     is not enough, at least in the following case.
+
+     .extern foo
+     [many .stabx entries]
+     [a few functions, referring to foo]
+     .globl foo
+     .bf
+
+     What happens here is that the assembler moves the .stabx entries
+     to right before the ".bf" for foo, but the symbol for "foo" is before
+     all the stabx entries.  See PR gdb/2222.  */
+
+  /* Maintaining a table of .bf entries might be preferable to this search.
+     If I understand things correctly it would need to be done only for
+     the duration of a single psymtab to symtab conversion.  */
+  while (symno < nsyms)
+    {
+      bfd_coff_swap_sym_in (symfile_bfd,
+			    stbl + (symno * local_symesz), symbol);
+      if (symbol->n_sclass == C_FCN && STREQ (symbol->n_name, ".bf"))
+	goto gotit;
+      symno += symbol->n_numaux + 1;
+    }
+
+  complain (&bf_notfound_complaint);
+  return 0;
+
+gotit:
+  /* take aux entry and return its lineno */
+  symno++;
+  bfd_coff_swap_aux_in (this_symtab_psymtab->objfile->obfd,
+			stbl + symno * local_symesz,
+			symbol->n_type, symbol->n_sclass,
+			0, symbol->n_numaux, main_aux);
+
+  return main_aux->x_sym.x_misc.x_lnsz.x_lnno;
+}
+
+/* Support for line number handling */
+
+/* This function is called for every section; it finds the outer limits
+ * of the line table (minimum and maximum file offset) so that the
+ * mainline code can read the whole thing for efficiency.
+ */
+static void
+find_linenos (abfd, asect, vpinfo)
+     bfd *abfd;
+     sec_ptr asect;
+     PTR vpinfo; 
+{
+  struct coff_symfile_info *info;
+  int size, count;
+  file_ptr offset, maxoff;
+
+  count = asect->lineno_count;
+
+  if (!STREQ (asect->name, ".text") || count == 0)
+    return;
+
+  size = count * coff_data (abfd)->local_linesz;
+  info = (struct coff_symfile_info *)vpinfo;
+  offset = asect->line_filepos;
+  maxoff = offset + size;
+
+  if (offset < info->min_lineno_offset || info->min_lineno_offset == 0)
+    info->min_lineno_offset = offset;
+
+  if (maxoff > info->max_lineno_offset)
+    info->max_lineno_offset = maxoff;
+}
+
+static void xcoff_psymtab_to_symtab_1 PARAMS ((struct partial_symtab *));
+
+static void
+xcoff_psymtab_to_symtab_1 (pst)
+     struct partial_symtab *pst;
+{
+  struct cleanup *old_chain;
+  int i;
+  
+  if (!pst)
+    return;
+
+  if (pst->readin)
+    {
+      fprintf_unfiltered
+	(gdb_stderr, "Psymtab for %s already read in.  Shouldn't happen.\n",
+	 pst->filename);
+      return;
+    }
+
+  /* Read in all partial symtabs on which this one is dependent */
+  for (i = 0; i < pst->number_of_dependencies; i++)
+    if (!pst->dependencies[i]->readin)
+      {
+	/* Inform about additional files that need to be read in.  */
+	if (info_verbose)
+	  {
+	    fputs_filtered (" ", gdb_stdout);
+	    wrap_here ("");
+	    fputs_filtered ("and ", gdb_stdout);
+	    wrap_here ("");
+	    printf_filtered ("%s...", pst->dependencies[i]->filename);
+	    wrap_here ("");		/* Flush output */
+	    gdb_flush (gdb_stdout);
+	  }
+	xcoff_psymtab_to_symtab_1 (pst->dependencies[i]);
+      }
+
+  if (((struct symloc *)pst->read_symtab_private)->numsyms != 0)
+    {
+      /* Init stuff necessary for reading in symbols.  */
+      stabsread_init ();
+      buildsym_init ();
+      old_chain = make_cleanup ((make_cleanup_func) really_free_pendings, 0);
+
+      read_xcoff_symtab (pst);
+      sort_symtab_syms (pst->symtab);
+
+      do_cleanups (old_chain);
+    }
+
+  pst->readin = 1;
+}
+
+static void xcoff_psymtab_to_symtab PARAMS ((struct partial_symtab *));
+
+/* Read in all of the symbols for a given psymtab for real.
+   Be verbose about it if the user wants that.  */
+
+static void
+xcoff_psymtab_to_symtab (pst)
+     struct partial_symtab *pst;
+{
+  bfd *sym_bfd;
+
+  if (!pst)
+    return;
+
+  if (pst->readin)
+    {
+      fprintf_unfiltered
+	(gdb_stderr, "Psymtab for %s already read in.  Shouldn't happen.\n",
+	 pst->filename);
+      return;
+    }
+
+  if (((struct symloc *)pst->read_symtab_private)->numsyms != 0
+      || pst->number_of_dependencies)
+    {
+      /* Print the message now, before reading the string table,
+	 to avoid disconcerting pauses.  */
+      if (info_verbose)
+	{
+	  printf_filtered ("Reading in symbols for %s...", pst->filename);
+	  gdb_flush (gdb_stdout);
+	}
+
+      sym_bfd = pst->objfile->obfd;
+
+      next_symbol_text_func = xcoff_next_symbol_text;
+
+      xcoff_psymtab_to_symtab_1 (pst);
+
+      /* Match with global symbols.  This only needs to be done once,
+         after all of the symtabs and dependencies have been read in.   */
+      scan_file_globals (pst->objfile);
+
+      /* Finish up the debug error message.  */
+      if (info_verbose)
+	printf_filtered ("done.\n");
+    }
+}
+
+static void
+xcoff_new_init (objfile)
+     struct objfile *objfile;
+{
+  stabsread_new_init ();
+  buildsym_new_init ();
+}
+
+/* Do initialization in preparation for reading symbols from OBJFILE.
+ 
+   We will only be called if this is an XCOFF or XCOFF-like file.
+   BFD handles figuring out the format of the file, and code in symfile.c
+   uses BFD's determination to vector to us.  */
+
+static void
+xcoff_symfile_init (objfile)
+     struct objfile *objfile;
+{
+  /* Allocate struct to keep track of the symfile */
+  objfile -> sym_private = xmmalloc (objfile -> md,
+				     sizeof (struct coff_symfile_info));
+
+  /* XCOFF objects may be reordered, so set OBJF_REORDERED.  If we
+     find this causes a significant slowdown in gdb then we could
+     set it in the debug symbol readers only when necessary.  */
+  objfile->flags |= OBJF_REORDERED;
+
+  init_entry_point_info (objfile);
+}
+
+/* Perform any local cleanups required when we are done with a particular
+   objfile.  I.E, we are in the process of discarding all symbol information
+   for an objfile, freeing up all memory held for it, and unlinking the
+   objfile struct from the global list of known objfiles. */
+
+static void
+xcoff_symfile_finish (objfile)
+     struct objfile *objfile;
+{
+  if (objfile -> sym_private != NULL)
+    {
+      mfree (objfile -> md, objfile -> sym_private);
+    }
+
+  /* Start with a fresh include table for the next objfile.  */
+  if (inclTable)
+    {
+      free (inclTable);
+      inclTable = NULL;
+    }
+  inclIndx = inclLength = inclDepth = 0;
+}
+
+
+static void
+init_stringtab (abfd, offset, objfile)
+     bfd *abfd;
+     file_ptr offset;
+     struct objfile *objfile;
+{
+  long length;
+  int val;
+  unsigned char lengthbuf[4];
+  char *strtbl;
+
+  ((struct coff_symfile_info *)objfile->sym_private)->strtbl = NULL;
+
+  if (bfd_seek (abfd, offset, SEEK_SET) < 0)
+    error ("cannot seek to string table in %s: %s",
+	   bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
+
+  val = bfd_read ((char *)lengthbuf, 1, sizeof lengthbuf, abfd);
+  length = bfd_h_get_32 (abfd, lengthbuf);
+
+  /* If no string table is needed, then the file may end immediately
+     after the symbols.  Just return with `strtbl' set to NULL.  */
+
+  if (val != sizeof lengthbuf || length < sizeof lengthbuf)
+    return;
+
+  /* Allocate string table from symbol_obstack. We will need this table
+     as long as we have its symbol table around. */
+
+  strtbl = (char *) obstack_alloc (&objfile->symbol_obstack, length);
+  ((struct coff_symfile_info *)objfile->sym_private)->strtbl = strtbl;
+
+  /* Copy length buffer, the first byte is usually zero and is
+     used for stabs with a name length of zero.  */
+  memcpy (strtbl, lengthbuf, sizeof lengthbuf);
+  if (length == sizeof lengthbuf)
+    return;
+
+  val = bfd_read (strtbl + sizeof lengthbuf, 1, length - sizeof lengthbuf,
+		  abfd);
+
+  if (val != length - sizeof lengthbuf)
+    error ("cannot read string table from %s: %s",
+	   bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
+  if (strtbl[length - 1] != '\0')
+    error ("bad symbol file: string table does not end with null character");
+
+  return;
+}
+
+/* If we have not yet seen a function for this psymtab, this is 0.  If we
+   have seen one, it is the offset in the line numbers of the line numbers
+   for the psymtab.  */
+static unsigned int first_fun_line_offset;
+
+static struct partial_symtab *xcoff_start_psymtab
+  PARAMS ((struct objfile *, struct section_offsets *, char *, int,
+	   struct partial_symbol **, struct partial_symbol **));
+
+/* Allocate and partially fill a partial symtab.  It will be
+   completely filled at the end of the symbol list.
+
+   SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR
+   is the address relative to which its symbols are (incremental) or 0
+   (normal). */
+
+static struct partial_symtab *
+xcoff_start_psymtab (objfile, section_offsets,
+		     filename, first_symnum, global_syms, static_syms)
+     struct objfile *objfile;
+     struct section_offsets *section_offsets;
+     char *filename;
+     int first_symnum;
+     struct partial_symbol **global_syms;
+     struct partial_symbol **static_syms;
+{
+  struct partial_symtab *result =
+    start_psymtab_common (objfile, section_offsets,
+			  filename,
+			  /* We fill in textlow later.  */
+			  0,
+			  global_syms, static_syms);
+
+  result->read_symtab_private = (char *)
+    obstack_alloc (&objfile -> psymbol_obstack, sizeof (struct symloc));
+  ((struct symloc *)result->read_symtab_private)->first_symnum = first_symnum;
+  result->read_symtab = xcoff_psymtab_to_symtab;
+
+  /* Deduce the source language from the filename for this psymtab. */
+  psymtab_language = deduce_language_from_filename (filename);
+
+  return result;
+}
+
+static struct partial_symtab *xcoff_end_psymtab
+  PARAMS ((struct partial_symtab *, char **, int, int,
+	   struct partial_symtab **, int, int));
+
+/* Close off the current usage of PST.  
+   Returns PST, or NULL if the partial symtab was empty and thrown away.
+
+   CAPPING_SYMBOL_NUMBER is the end of pst (exclusive).
+
+   INCLUDE_LIST, NUM_INCLUDES, DEPENDENCY_LIST, and NUMBER_DEPENDENCIES
+   are the information for includes and dependencies.  */
+
+static struct partial_symtab *
+xcoff_end_psymtab (pst, include_list, num_includes, capping_symbol_number,
+		   dependency_list, number_dependencies, textlow_not_set)
+     struct partial_symtab *pst;
+     char **include_list;
+     int num_includes;
+     int capping_symbol_number;
+     struct partial_symtab **dependency_list;
+     int number_dependencies;
+     int textlow_not_set;
+{
+  int i;
+  struct objfile *objfile = pst -> objfile;
+
+  if (capping_symbol_number != -1)
+    ((struct symloc *)pst->read_symtab_private)->numsyms =
+      capping_symbol_number
+	- ((struct symloc *)pst->read_symtab_private)->first_symnum;
+  ((struct symloc *)pst->read_symtab_private)->lineno_off =
+    first_fun_line_offset;
+  first_fun_line_offset = 0;
+  pst->n_global_syms =
+    objfile->global_psymbols.next - (objfile->global_psymbols.list + pst->globals_offset);
+  pst->n_static_syms =
+    objfile->static_psymbols.next - (objfile->static_psymbols.list + pst->statics_offset);
+
+  pst->number_of_dependencies = number_dependencies;
+  if (number_dependencies)
+    {
+      pst->dependencies = (struct partial_symtab **)
+	obstack_alloc (&objfile->psymbol_obstack,
+		       number_dependencies * sizeof (struct partial_symtab *));
+      memcpy (pst->dependencies, dependency_list,
+	     number_dependencies * sizeof (struct partial_symtab *));
+    }
+  else
+    pst->dependencies = 0;
+
+  for (i = 0; i < num_includes; i++)
+    {
+      struct partial_symtab *subpst =
+	allocate_psymtab (include_list[i], objfile);
+
+      subpst->section_offsets = pst->section_offsets;
+      subpst->read_symtab_private =
+	  (char *) obstack_alloc (&objfile->psymbol_obstack,
+				  sizeof (struct symloc));
+      ((struct symloc *)subpst->read_symtab_private)->first_symnum = 0;
+      ((struct symloc *)subpst->read_symtab_private)->numsyms = 0;
+      subpst->textlow = 0;
+      subpst->texthigh = 0;
+
+      /* We could save slight bits of space by only making one of these,
+	 shared by the entire set of include files.  FIXME-someday.  */
+      subpst->dependencies = (struct partial_symtab **)
+	obstack_alloc (&objfile->psymbol_obstack,
+		       sizeof (struct partial_symtab *));
+      subpst->dependencies[0] = pst;
+      subpst->number_of_dependencies = 1;
+
+      subpst->globals_offset =
+	subpst->n_global_syms =
+	  subpst->statics_offset =
+	    subpst->n_static_syms = 0;
+
+      subpst->readin = 0;
+      subpst->symtab = 0;
+      subpst->read_symtab = pst->read_symtab;
+    }
+
+  sort_pst_symbols (pst);
+
+  /* If there is already a psymtab or symtab for a file of this name,
+     remove it.  (If there is a symtab, more drastic things also
+     happen.)  This happens in VxWorks.  */
+  free_named_symtabs (pst->filename);
+
+  if (num_includes == 0
+      && number_dependencies == 0
+      && pst->n_global_syms == 0
+      && pst->n_static_syms == 0)
+    {
+      /* Throw away this psymtab, it's empty.  We can't deallocate it, since
+	 it is on the obstack, but we can forget to chain it on the list.  */
+      /* Empty psymtabs happen as a result of header files which don't have
+	 any symbols in them.  There can be a lot of them.  */
+
+      discard_psymtab (pst);
+
+      /* Indicate that psymtab was thrown away.  */
+      pst = (struct partial_symtab *)NULL;
+    }
+  return pst;
+}
+
+static void swap_sym PARAMS ((struct internal_syment *,
+			      union internal_auxent *, char **, char **,
+			      unsigned int *,
+			      struct objfile *));
+
+/* Swap raw symbol at *RAW and put the name in *NAME, the symbol in
+   *SYMBOL, the first auxent in *AUX.  Advance *RAW and *SYMNUMP over
+   the symbol and its auxents.  */
+
+static void
+swap_sym (symbol, aux, name, raw, symnump, objfile)
+     struct internal_syment *symbol;
+     union internal_auxent *aux;
+     char **name;
+     char **raw;
+     unsigned int *symnump;
+     struct objfile *objfile;
+{
+  bfd_coff_swap_sym_in (objfile->obfd, *raw, symbol);
+  if (symbol->n_zeroes)
+    {
+      /* If it's exactly E_SYMNMLEN characters long it isn't
+	 '\0'-terminated.  */
+      if (symbol->n_name[E_SYMNMLEN - 1] != '\0')
+	{
+	  /* FIXME: wastes memory for symbols which we don't end up putting
+	     into the minimal symbols.  */
+	  char *p;
+	  p = obstack_alloc (&objfile->psymbol_obstack, E_SYMNMLEN + 1);
+	  strncpy (p, symbol->n_name, E_SYMNMLEN);
+	  p[E_SYMNMLEN] = '\0';
+	  *name = p;
+	}
+      else
+	/* Point to the unswapped name as that persists as long as the
+	   objfile does.  */
+	*name = ((struct external_syment *)*raw)->e.e_name;
+    }
+  else if (symbol->n_sclass & 0x80)
+    {
+      *name = ((struct coff_symfile_info *)objfile->sym_private)->debugsec
+	+ symbol->n_offset;
+    }
+  else
+    {
+      *name = ((struct coff_symfile_info *)objfile->sym_private)->strtbl
+	+ symbol->n_offset;
+    }
+  ++*symnump;
+  *raw += coff_data (objfile->obfd)->local_symesz;
+  if (symbol->n_numaux > 0)
+    {
+      bfd_coff_swap_aux_in (objfile->obfd, *raw, symbol->n_type,
+			    symbol->n_sclass, 0, symbol->n_numaux, aux);
+
+      *symnump += symbol->n_numaux;
+      *raw += coff_data (objfile->obfd)->local_symesz * symbol->n_numaux;
+    }
+}
+
+static void
+scan_xcoff_symtab (section_offsets, objfile)
+     struct section_offsets *section_offsets;
+     struct objfile *objfile;
+{
+  CORE_ADDR toc_offset = 0;		/* toc offset value in data section. */
+  char *filestring = NULL;
+
+  char *namestring;
+  int past_first_source_file = 0;
+  bfd *abfd;
+  asection *bfd_sect;
+  unsigned int nsyms;
+
+  /* Current partial symtab */
+  struct partial_symtab *pst;
+
+  /* List of current psymtab's include files */
+  char **psymtab_include_list;
+  int includes_allocated;
+  int includes_used;
+
+  /* Index within current psymtab dependency list */
+  struct partial_symtab **dependency_list;
+  int dependencies_used, dependencies_allocated;
+
+  char *sraw_symbol;
+  struct internal_syment symbol;
+  union internal_auxent main_aux;
+  unsigned int ssymnum;
+
+  char *last_csect_name = NULL;		/* last seen csect's name and value */
+  CORE_ADDR last_csect_val = 0;
+  int last_csect_sec = 0;
+  int  misc_func_recorded = 0;		/* true if any misc. function */
+  int textlow_not_set = 1;
+
+  pst = (struct partial_symtab *) 0;
+
+  includes_allocated = 30;
+  includes_used = 0;
+  psymtab_include_list = (char **) alloca (includes_allocated *
+					   sizeof (char *));
+
+  dependencies_allocated = 30;
+  dependencies_used = 0;
+  dependency_list =
+    (struct partial_symtab **) alloca (dependencies_allocated *
+				       sizeof (struct partial_symtab *));
+
+  last_source_file = NULL;
+
+  abfd = objfile->obfd;
+
+  sraw_symbol = ((struct coff_symfile_info *)objfile->sym_private)->symtbl;
+  nsyms = ((struct coff_symfile_info *)objfile->sym_private)->symtbl_num_syms;
+  ssymnum = 0;
+  while (ssymnum < nsyms)
+    {
+      int sclass = ((struct external_syment *)sraw_symbol)->e_sclass[0] & 0xff;
+      /* This is the type we pass to partial-stab.h.  A less kludgy solution
+	 would be to break out partial-stab.h into its various parts--shuffle
+	 off the DBXREAD_ONLY stuff to dbxread.c, and make separate
+	 pstab-norm.h (for most types), pstab-sol.h (for N_SOL), etc.  */
+      int stype;
+
+      QUIT;
+
+      switch (sclass)
+	{
+	case C_EXT:
+	case C_HIDEXT:
+	  {
+	    /* The CSECT auxent--always the last auxent.  */
+	    union internal_auxent csect_aux;
+	    unsigned int symnum_before = ssymnum;
+
+	    swap_sym (&symbol, &main_aux, &namestring, &sraw_symbol,
+		      &ssymnum, objfile);
+	    if (symbol.n_numaux > 1)
+	      {
+		bfd_coff_swap_aux_in
+		  (objfile->obfd,
+		   sraw_symbol - coff_data(abfd)->local_symesz,
+		   symbol.n_type,
+		   symbol.n_sclass,
+		   symbol.n_numaux - 1,
+		   symbol.n_numaux,
+		   &csect_aux);
+	      }
+	    else
+	      csect_aux = main_aux;
+
+	    /* If symbol name starts with ".$" or "$", ignore it.  */
+	    if (namestring[0] == '$'
+		|| (namestring[0] == '.' && namestring[1] == '$'))
+	      break;
+
+	    switch (csect_aux.x_csect.x_smtyp & 0x7)
+	      {
+	      case XTY_SD:
+		switch (csect_aux.x_csect.x_smclas)
+		  {
+		  case XMC_PR:
+		    if (last_csect_name)
+		      {
+			/* If no misc. function recorded in the last
+			   seen csect, enter it as a function. This
+			   will take care of functions like strcmp()
+			   compiled by xlc.  */
+
+			if (!misc_func_recorded)
+			  {
+			    RECORD_MINIMAL_SYMBOL
+			      (last_csect_name, last_csect_val,
+			       mst_text, last_csect_sec,
+			       objfile);
+			  }
+
+			if (pst != NULL)
+			  {
+			    /* We have to allocate one psymtab for
+			       each program csect, because their text
+			       sections need not be adjacent.  */
+			    xcoff_end_psymtab
+			      (pst, psymtab_include_list, includes_used,
+			       symnum_before, dependency_list,
+			       dependencies_used, textlow_not_set);
+			    includes_used = 0;
+			    dependencies_used = 0;
+			    /* Give all psymtabs for this source file the same
+			       name.  */
+			    pst = xcoff_start_psymtab
+			      (objfile, section_offsets,
+			       filestring,
+			       symnum_before,
+			       objfile->global_psymbols.next,
+			       objfile->static_psymbols.next);
+			  }
+		      }
+		    if (namestring && namestring[0] == '.')
+		      {
+			last_csect_name = namestring;
+			last_csect_val = symbol.n_value;
+			last_csect_sec =
+			  secnum_to_section (symbol.n_scnum, objfile);
+		      }
+		    if (pst != NULL)
+		      {
+			CORE_ADDR highval =
+			  symbol.n_value + csect_aux.x_csect.x_scnlen.l;
+			if (highval > pst->texthigh)
+			  pst->texthigh = highval;
+			if (pst->textlow == 0 || symbol.n_value < pst->textlow)
+			  pst->textlow = symbol.n_value;
+		      }
+		    misc_func_recorded = 0;
+		    break;
+
+		  case XMC_RW:
+		    /* Data variables are recorded in the minimal symbol
+		       table, except for section symbols.  */
+		    if (*namestring != '.')
+		      prim_record_minimal_symbol_and_info
+			(namestring, symbol.n_value,
+			 sclass == C_HIDEXT ? mst_file_data : mst_data,
+			 NULL, secnum_to_section (symbol.n_scnum, objfile),
+			 NULL, objfile);
+		    break;
+
+		  case XMC_TC0:
+		    if (toc_offset)
+		      warning ("More than one XMC_TC0 symbol found.");
+		    toc_offset = symbol.n_value;
+
+		    /* Make TOC offset relative to start address of section.  */
+		    bfd_sect = secnum_to_bfd_section (symbol.n_scnum, objfile);
+		    if (bfd_sect)
+		      toc_offset -= bfd_section_vma (objfile->obfd, bfd_sect);
+		    break;
+
+		  case XMC_TC:
+		    /* These symbols tell us where the TOC entry for a
+		       variable is, not the variable itself.  */
+		    break;
+
+		  default:
+		    break;
+		  }
+		break;
+
+	      case XTY_LD:
+		switch (csect_aux.x_csect.x_smclas)
+		  {
+		  case XMC_PR:
+		    /* A function entry point.  */
+
+		    if (first_fun_line_offset == 0 && symbol.n_numaux > 1)
+		      first_fun_line_offset =
+			main_aux.x_sym.x_fcnary.x_fcn.x_lnnoptr;
+		    RECORD_MINIMAL_SYMBOL
+		      (namestring, symbol.n_value,
+		       sclass == C_HIDEXT ? mst_file_text : mst_text,
+		       secnum_to_section (symbol.n_scnum, objfile),
+		       objfile);
+		    break;
+
+		  case XMC_GL:
+		    /* shared library function trampoline code entry
+		       point. */
+
+		    /* record trampoline code entries as
+		       mst_solib_trampoline symbol.  When we lookup mst
+		       symbols, we will choose mst_text over
+		       mst_solib_trampoline. */
+		    RECORD_MINIMAL_SYMBOL
+		      (namestring, symbol.n_value,
+		       mst_solib_trampoline,
+		       secnum_to_section (symbol.n_scnum, objfile),
+		       objfile);
+		    break;
+
+		  case XMC_DS:
+		    /* The symbols often have the same names as
+		       debug symbols for functions, and confuse
+		       lookup_symbol.  */
+		    break;
+
+		  default:
+
+		    /* xlc puts each variable in a separate csect,
+		       so we get an XTY_SD for each variable.  But
+		       gcc puts several variables in a csect, so
+		       that each variable only gets an XTY_LD.  We
+		       still need to record them.  This will
+		       typically be XMC_RW; I suspect XMC_RO and
+		       XMC_BS might be possible too.  */
+		    if (*namestring != '.')
+		      prim_record_minimal_symbol_and_info
+			(namestring, symbol.n_value,
+			 sclass == C_HIDEXT ? mst_file_data : mst_data,
+			 NULL, secnum_to_section (symbol.n_scnum, objfile),
+			 NULL, objfile);
+		    break;
+		  }
+		break;
+
+	      case XTY_CM:
+		switch (csect_aux.x_csect.x_smclas)
+		  {
+		  case XMC_RW:
+		  case XMC_BS:
+		    /* Common variables are recorded in the minimal symbol
+		       table, except for section symbols.  */
+		    if (*namestring != '.')
+		      prim_record_minimal_symbol_and_info
+			(namestring, symbol.n_value,
+			 sclass == C_HIDEXT ? mst_file_bss : mst_bss,
+			 NULL, secnum_to_section (symbol.n_scnum, objfile),
+			 NULL, objfile);
+		    break;
+		  }
+		break;
+
+	      default:
+		break;
+	      }
+	  }
+	  break;
+	case C_FILE:
+	  {
+	    unsigned int symnum_before;
+
+	    symnum_before = ssymnum;
+	    swap_sym (&symbol, &main_aux, &namestring, &sraw_symbol,
+		      &ssymnum, objfile);
+
+	    /* See if the last csect needs to be recorded.  */
+
+	    if (last_csect_name && !misc_func_recorded)
+	      {
+
+		/* If no misc. function recorded in the last seen csect, enter
+		   it as a function.  This will take care of functions like
+		   strcmp() compiled by xlc.  */
+
+		RECORD_MINIMAL_SYMBOL
+		  (last_csect_name, last_csect_val,
+		   mst_text, last_csect_sec, objfile);
+	      }
+
+	    if (pst)
+	      {
+		xcoff_end_psymtab (pst, psymtab_include_list, includes_used,
+				   symnum_before, dependency_list,
+				   dependencies_used, textlow_not_set);
+		includes_used = 0;
+		dependencies_used = 0;
+	      }
+	    first_fun_line_offset = 0;
+
+	    /* XCOFF, according to the AIX 3.2 documentation, puts the
+	       filename in cs->c_name.  But xlc 1.3.0.2 has decided to
+	       do things the standard COFF way and put it in the auxent.
+	       We use the auxent if the symbol is ".file" and an auxent
+	       exists, otherwise use the symbol itself.  */
+	    if (!strcmp (namestring, ".file") && symbol.n_numaux > 0)
+	      {
+		filestring = coff_getfilename (&main_aux, objfile);
+	      }
+	    else
+	      filestring = namestring;
+
+	    pst = xcoff_start_psymtab (objfile, section_offsets,
+				       filestring,
+				       symnum_before,
+				       objfile->global_psymbols.next,
+				       objfile->static_psymbols.next);
+	    last_csect_name = NULL;
+	  }
+	  break;
+
+	default:
+	  {
+	    static struct complaint msg =
+	      {"Storage class %d not recognized during scan", 0, 0};
+	    complain (&msg, sclass);
+	  }
+	  /* FALLTHROUGH */
+
+	  /* C_FCN is .bf and .ef symbols.  I think it is sufficient
+	     to handle only the C_FUN and C_EXT.  */
+	case C_FCN:
+
+	case C_BSTAT:
+	case C_ESTAT:
+	case C_ARG:
+	case C_REGPARM:
+	case C_REG:
+	case C_TPDEF:
+	case C_STRTAG:
+	case C_UNTAG:
+	case C_ENTAG:
+	case C_LABEL:
+	case C_NULL:
+
+	  /* C_EINCL means we are switching back to the main file.  But there
+	     is no reason to care; the only thing we want to know about
+	     includes is the names of all the included (.h) files.  */
+	case C_EINCL:
+
+	case C_BLOCK:
+
+	  /* I don't think C_STAT is used in xcoff; C_HIDEXT appears to be
+	     used instead.  */
+	case C_STAT:
+
+	  /* I don't think the name of the common block (as opposed to the
+	     variables within it) is something which is user visible
+	     currently.  */
+	case C_BCOMM:
+	case C_ECOMM:
+
+	case C_PSYM:
+	case C_RPSYM:
+
+	  /* I think we can ignore C_LSYM; types on xcoff seem to use C_DECL
+	     so C_LSYM would appear to be only for locals.  */
+	case C_LSYM:
+
+	case C_AUTO:
+	case C_RSYM:
+	  {
+	    /* We probably could save a few instructions by assuming that
+	       C_LSYM, C_PSYM, etc., never have auxents.  */
+	    int naux1 =
+	      ((struct external_syment *)sraw_symbol)->e_numaux[0] + 1;
+	    ssymnum += naux1;
+	    sraw_symbol += sizeof (struct external_syment) * naux1;
+	  }
+	  break;
+
+	case C_BINCL:
+	  stype = N_SOL;
+	  goto pstab;
+
+	case C_FUN:
+	  /* The value of the C_FUN is not the address of the function (it
+	     appears to be the address before linking), but as long as it
+	     is smaller than the actual address, then find_pc_partial_function
+	     will use the minimal symbols instead.  I hope.  */
+
+	case C_GSYM:
+	case C_ECOML:
+	case C_DECL:
+	case C_STSYM:
+	  stype = N_LSYM;
+	pstab:;
+	  swap_sym (&symbol, &main_aux, &namestring, &sraw_symbol,
+		    &ssymnum, objfile);
+#define CUR_SYMBOL_TYPE stype
+#define CUR_SYMBOL_VALUE symbol.n_value
+
+/* START_PSYMTAB and END_PSYMTAB are never used, because they are only
+   called from DBXREAD_ONLY or N_SO code.  Likewise for the symnum
+   variable.  */
+#define START_PSYMTAB(ofile,secoff,fname,low,symoff,global_syms,static_syms) 0
+#define END_PSYMTAB(pst,ilist,ninc,c_off,c_text,dep_list,n_deps,textlow_not_set)\
+  do {} while (0)
+/* We have already set the namestring.  */
+#define SET_NAMESTRING() /* */
+
+#include "partial-stab.h"
+	}
+    }
+
+  if (pst)
+    {
+      xcoff_end_psymtab (pst, psymtab_include_list, includes_used,
+			 ssymnum, dependency_list,
+			 dependencies_used, textlow_not_set);
+    }
+
+  /* Record the toc offset value of this symbol table into objfile structure.
+     If no XMC_TC0 is found, toc_offset should be zero. Another place to obtain
+     this information would be file auxiliary header. */
+
+  ((struct coff_symfile_info *) objfile->sym_private)->toc_offset = toc_offset;
+}
+
+/* Return the toc offset value for a given objfile.  */
+
+CORE_ADDR
+get_toc_offset (objfile)
+     struct objfile *objfile;
+{
+  if (objfile)
+    return ((struct coff_symfile_info *) objfile->sym_private)->toc_offset;
+  return 0;
+}
+
+/* Scan and build partial symbols for a symbol file.
+   We have been initialized by a call to dbx_symfile_init, which 
+   put all the relevant info into a "struct dbx_symfile_info",
+   hung off the objfile structure.
+
+   SECTION_OFFSETS contains offsets relative to which the symbols in the
+   various sections are (depending where the sections were actually loaded).
+   MAINLINE is true if we are reading the main symbol
+   table (as opposed to a shared lib or dynamically loaded file).  */
+
+static void
+xcoff_initial_scan (objfile, section_offsets, mainline)
+     struct objfile *objfile;
+     struct section_offsets *section_offsets;
+     int mainline;	/* FIXME comments above */
+{
+  bfd *abfd;
+  int val;
+  struct cleanup *back_to;
+  int num_symbols;			/* # of symbols */
+  file_ptr symtab_offset;		/* symbol table and */
+  file_ptr stringtab_offset;		/* string table file offsets */
+  struct coff_symfile_info *info;
+  char *name;
+  unsigned int size;
+
+  info = (struct coff_symfile_info *) objfile -> sym_private;
+  symfile_bfd = abfd = objfile->obfd;
+  name = objfile->name;
+
+  num_symbols = bfd_get_symcount (abfd);	/* # of symbols */
+  symtab_offset = obj_sym_filepos (abfd);	/* symbol table file offset */
+  stringtab_offset = symtab_offset +
+    num_symbols * coff_data(abfd)->local_symesz;
+
+  info->min_lineno_offset = 0;
+  info->max_lineno_offset = 0;
+  bfd_map_over_sections (abfd, find_linenos, info);
+
+  if (num_symbols > 0)
+    {
+      /* Read the string table.  */
+      init_stringtab (abfd, stringtab_offset, objfile);
+
+      /* Read the .debug section, if present.  */
+      {
+	sec_ptr secp;
+	bfd_size_type length;
+	char *debugsec = NULL;
+
+	secp = bfd_get_section_by_name (abfd, ".debug");
+	if (secp)
+	  {
+	    length = bfd_section_size (abfd, secp);
+	    if (length)
+	      {
+		debugsec =
+		  (char *) obstack_alloc (&objfile->symbol_obstack, length);
+
+		if (!bfd_get_section_contents (abfd, secp, debugsec,
+					       (file_ptr) 0, length))
+		  {
+		    error ("Error reading .debug section of `%s': %s",
+			   name, bfd_errmsg (bfd_get_error ()));
+		  }
+	      }
+	  }
+	((struct coff_symfile_info *)objfile->sym_private)->debugsec =
+	  debugsec;
+      }
+    }
+
+  /* Read the symbols.  We keep them in core because we will want to
+     access them randomly in read_symbol*.  */
+  val = bfd_seek (abfd, symtab_offset, SEEK_SET);
+  if (val < 0)
+    error ("Error reading symbols from %s: %s",
+	   name, bfd_errmsg (bfd_get_error ()));
+  size = coff_data (abfd)->local_symesz * num_symbols;
+  ((struct coff_symfile_info *)objfile->sym_private)->symtbl =
+    obstack_alloc (&objfile->symbol_obstack, size);
+  ((struct coff_symfile_info *)objfile->sym_private)->symtbl_num_syms =
+    num_symbols;
+
+  val = bfd_read (((struct coff_symfile_info *)objfile->sym_private)->symtbl,
+		  size, 1, abfd);
+  if (val != size)
+    perror_with_name ("reading symbol table");
+
+  /* If we are reinitializing, or if we have never loaded syms yet, init */
+  if (mainline
+      || objfile->global_psymbols.size == 0
+      || objfile->static_psymbols.size == 0)
+    /* I'm not sure how how good num_symbols is; the rule of thumb in
+       init_psymbol_list was developed for a.out.  On the one hand,
+       num_symbols includes auxents.  On the other hand, it doesn't
+       include N_SLINE.  */
+    init_psymbol_list (objfile, num_symbols);
+
+  free_pending_blocks ();
+  back_to = make_cleanup ((make_cleanup_func) really_free_pendings, 0);
+
+  init_minimal_symbol_collection ();
+  make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0);
+
+  /* Now that the symbol table data of the executable file are all in core,
+     process them and define symbols accordingly.  */
+
+  scan_xcoff_symtab (section_offsets, objfile);
+
+  /* Install any minimal symbols that have been collected as the current
+     minimal symbols for this objfile. */
+
+  install_minimal_symbols (objfile);
+
+  do_cleanups (back_to);
+}
+
+static struct section_offsets *
+xcoff_symfile_offsets (objfile, addr)
+     struct objfile *objfile;
+     CORE_ADDR addr;
+{
+  struct section_offsets *section_offsets;
+  int i;
+
+  objfile->num_sections = SECT_OFF_MAX;
+  section_offsets = (struct section_offsets *)
+    obstack_alloc
+      (&objfile -> psymbol_obstack,
+       sizeof (struct section_offsets)
+       + sizeof (section_offsets->offsets) * objfile->num_sections);
+
+  /* syms_from_objfile kindly subtracts from addr the bfd_section_vma
+     of the .text section.  This strikes me as wrong--whether the
+     offset to be applied to symbol reading is relative to the start
+     address of the section depends on the symbol format.  In any
+     event, this whole "addr" concept is pretty broken (it doesn't
+     handle any section but .text sensibly), so just ignore the addr
+     parameter and use 0.  rs6000-nat.c will set the correct section
+     offsets via objfile_relocate.  */
+  for (i = 0; i < objfile->num_sections; ++i)
+    ANOFFSET (section_offsets, i) = 0;
+
+  return section_offsets;
+}
+
+/* Register our ability to parse symbols for xcoff BFD files.  */
+
+static struct sym_fns xcoff_sym_fns =
+{
+
+  /* Because the bfd uses coff_flavour, we need to specially kludge
+     the flavour.  It is possible that coff and xcoff should be merged as
+     they do have fundamental similarities (for example, the extra storage
+     classes used for stabs could presumably be recognized in any COFF file).
+     However, in addition to obvious things like all the csect hair, there are
+     some subtler differences between xcoffread.c and coffread.c, notably
+     the fact that coffread.c has no need to read in all the symbols, but
+     xcoffread.c reads all the symbols and does in fact randomly access them
+     (in C_BSTAT and line number processing).  */
+
+  (enum bfd_flavour)-1,
+
+  xcoff_new_init,	/* sym_new_init: init anything gbl to entire symtab */
+  xcoff_symfile_init,	/* sym_init: read initial info, setup for sym_read() */
+  xcoff_initial_scan,	/* sym_read: read a symbol file into symtab */
+  xcoff_symfile_finish, /* sym_finish: finished with file, cleanup */
+  xcoff_symfile_offsets, /* sym_offsets: xlate offsets ext->int form */
+  NULL			/* next: pointer to next struct sym_fns */
+};
+
+void
+_initialize_xcoffread ()
+{
+  add_symtab_fns(&xcoff_sym_fns);
+
+  func_symbol_type = init_type (TYPE_CODE_FUNC, 1, 0,
+				"<function, no debug info>", NULL);
+  TYPE_TARGET_TYPE (func_symbol_type) = builtin_type_int;
+  var_symbol_type =
+    init_type (TYPE_CODE_INT, TARGET_INT_BIT / HOST_CHAR_BIT, 0,
+	       "<variable, no debug info>", NULL);
+}