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coffread.c
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coffread.c
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/* Read coff symbol tables and convert to internal format, for GDB.
Design and support routines derived from dbxread.c, and UMAX COFF
specific routines written 9/1/87 by David D. Johnson, Brown University.
Revised 11/27/87 ddj@cs.brown.edu
Copyright (C) 1987, 1988 Free Software Foundation, Inc.
GDB is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY. No author or distributor accepts responsibility to anyone
for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing.
Refer to the GDB General Public License for full details.
Everyone is granted permission to copy, modify and redistribute GDB,
but only under the conditions described in the GDB General Public
License. A copy of this license is supposed to have been given to you
along with GDB so you can know your rights and responsibilities. It
should be in a file named COPYING. Among other things, the copyright
notice and this notice must be preserved on all copies.
In other words, go ahead and share GDB, but don't try to stop
anyone else from sharing it farther. Help stamp out software hoarding!
*/
#ifdef ti1500
/* added for GNU C extensions */
#pragma EXTENSIONS
#endif
#include "defs.h"
#include "param.h"
#ifdef COFF_FORMAT
#include "symtab.h"
#ifdef USG
#include <sys/types.h>
#include <sys/fcntl.h>
#endif
#ifdef ti1500
extern fclose();
#include <a.out.h>
#endif
#include <stdio.h>
#include <obstack.h>
#include <sys/param.h>
#include <sys/file.h>
static void add_symbol_to_list ();
static void read_coff_symtab ();
static void patch_opaque_types ();
static struct type *decode_function_type ();
static struct type *decode_type ();
static struct type *decode_base_type ();
static struct type *read_enum_type ();
static struct type *read_struct_type ();
static void finish_block ();
static struct blockvector *make_blockvector ();
static struct symbol *process_coff_symbol ();
static int init_stringtab ();
static void free_stringtab ();
static char *getfilename ();
static char *getsymname ();
static int init_lineno ();
static void enter_linenos ();
extern void free_all_symtabs ();
extern void free_all_psymtabs ();
/* Name of source file whose symbol data we are now processing.
This comes from a symbol named ".file". */
static char *last_source_file;
/* Core address of start and end of text of current source file.
This comes from a ".text" symbol where x_nlinno > 0. */
static CORE_ADDR cur_src_start_addr;
static CORE_ADDR cur_src_end_addr;
/* End of the text segment of the executable file,
as found in the symbol _etext. */
static CORE_ADDR end_of_text_addr;
/* The addresses of the symbol table stream and number of symbols
of the object file we are reading (as copied into core). */
static FILE *nlist_stream_global;
static int nlist_nsyms_global;
/* The file and text section headers of the symbol file */
static FILHDR file_hdr;
static SCNHDR text_hdr;
/* The index in the symbol table of the last coff symbol that was processed. */
static int symnum;
/* Vector of types defined so far, indexed by their coff symnum. */
static struct typevector *type_vector;
/* Number of elements allocated for type_vector currently. */
static int type_vector_length;
/* Vector of line number information. */
static struct linetable *line_vector;
/* Index of next entry to go in line_vector_index. */
static int line_vector_index;
/* Last line number recorded in the line vector. */
static int prev_line_number;
/* Number of elements allocated for line_vector currently. */
static int line_vector_length;
/* Chain of typedefs of pointers to empty struct/union types.
They are chained thru the SYMBOL_VALUE. */
#define HASHSIZE 127
static struct symbol *opaque_type_chain[HASHSIZE];
/* Record the symbols defined for each context in a list.
We don't create a struct block for the context until we
know how long to make it. */
struct pending
{
struct pending *next;
struct symbol *symbol;
};
/* Here are the three lists that symbols are put on. */
struct pending *file_symbols; /* static at top level, and types */
struct pending *global_symbols; /* global functions and variables */
struct pending *local_symbols; /* everything local to lexical context */
/* List of unclosed lexical contexts
(that will become blocks, eventually). */
struct context_stack
{
struct context_stack *next;
struct pending *locals;
struct pending_block *old_blocks;
struct symbol *name;
CORE_ADDR start_addr;
int depth;
};
struct context_stack *context_stack;
/* Nonzero if within a function (so symbols should be local,
if nothing says specifically). */
int within_function;
/* List of blocks already made (lexical contexts already closed).
This is used at the end to make the blockvector. */
struct pending_block
{
struct pending_block *next;
struct block *block;
};
struct pending_block *pending_blocks;
extern CORE_ADDR first_object_file_end; /* From blockframe.c */
/* File name symbols were loaded from. */
static char *symfile;
/* Look up a coff type-number index. Return the address of the slot
where the type for that index is stored.
The type-number is in INDEX.
This can be used for finding the type associated with that index
or for associating a new type with the index. */
static struct type **
coff_lookup_type (index)
register int index;
{
if (index >= type_vector_length)
{
int old_vector_length = type_vector_length;
type_vector_length *= 2;
if (type_vector_length < index) {
type_vector_length = index * 2;
}
type_vector = (struct typevector *)
xrealloc (type_vector, sizeof (struct typevector)
+ type_vector_length * sizeof (struct type *));
bzero (&type_vector->type[ old_vector_length ],
(type_vector_length - old_vector_length) * sizeof(struct type *));
}
return &type_vector->type[index];
}
/* Make sure there is a type allocated for type number index
and return the type object.
This can create an empty (zeroed) type object. */
static struct type *
coff_alloc_type (index)
int index;
{
register struct type **type_addr = coff_lookup_type (index);
register struct type *type = *type_addr;
/* If we are referring to a type not known at all yet,
allocate an empty type for it.
We will fill it in later if we find out how. */
if (type == 0)
{
type = (struct type *) obstack_alloc (symbol_obstack,
sizeof (struct type));
bzero (type, sizeof (struct type));
*type_addr = type;
}
return type;
}
/* maintain the lists of symbols and blocks */
/* Add a symbol to one of the lists of symbols. */
static void
add_symbol_to_list (symbol, listhead)
struct symbol *symbol;
struct pending **listhead;
{
register struct pending *link
= (struct pending *) xmalloc (sizeof (struct pending));
link->next = *listhead;
link->symbol = symbol;
*listhead = link;
}
/* Take one of the lists of symbols and make a block from it.
Put the block on the list of pending blocks. */
static void
finish_block (symbol, listhead, old_blocks, start, end)
struct symbol *symbol;
struct pending **listhead;
struct pending_block *old_blocks;
CORE_ADDR start, end;
{
register struct pending *next, *next1;
register struct block *block;
register struct pending_block *pblock;
struct pending_block *opblock;
register int i;
/* Count the length of the list of symbols. */
for (next = *listhead, i = 0; next; next = next->next, i++);
block = (struct block *)
obstack_alloc (symbol_obstack, sizeof (struct block) + (i - 1) * sizeof (struct symbol *));
/* Copy the symbols into the block. */
BLOCK_NSYMS (block) = i;
for (next = *listhead; next; next = next->next)
BLOCK_SYM (block, --i) = next->symbol;
BLOCK_START (block) = start;
BLOCK_END (block) = end;
BLOCK_SUPERBLOCK (block) = 0; /* Filled in when containing block is made */
/* Put the block in as the value of the symbol that names it. */
if (symbol)
{
SYMBOL_BLOCK_VALUE (symbol) = block;
BLOCK_FUNCTION (block) = symbol;
}
else
BLOCK_FUNCTION (block) = 0;
/* Now free the links of the list, and empty the list. */
for (next = *listhead; next; next = next1)
{
next1 = next->next;
free (next);
}
*listhead = 0;
/* Install this block as the superblock
of all blocks made since the start of this scope
that don't have superblocks yet. */
opblock = 0;
for (pblock = pending_blocks; pblock != old_blocks; pblock = pblock->next)
{
if (BLOCK_SUPERBLOCK (pblock->block) == 0)
BLOCK_SUPERBLOCK (pblock->block) = block;
opblock = pblock;
}
/* Record this block on the list of all blocks in the file.
Put it after opblock, or at the beginning if opblock is 0.
This puts the block in the list after all its subblocks. */
pblock = (struct pending_block *) xmalloc (sizeof (struct pending_block));
pblock->block = block;
if (opblock)
{
pblock->next = opblock->next;
opblock->next = pblock;
}
else
{
pblock->next = pending_blocks;
pending_blocks = pblock;
}
}
static struct blockvector *
make_blockvector ()
{
register struct pending_block *next, *next1;
register struct blockvector *blockvector;
register int i;
/* Count the length of the list of blocks. */
for (next = pending_blocks, i = 0; next; next = next->next, i++);
blockvector = (struct blockvector *)
obstack_alloc (symbol_obstack, sizeof (struct blockvector) + (i - 1) * sizeof (struct block *));
/* Copy the blocks into the blockvector.
This is done in reverse order, which happens to put
the blocks into the proper order (ascending starting address).
finish_block has hair to insert each block into the list
after its subblocks in order to make sure this is true. */
BLOCKVECTOR_NBLOCKS (blockvector) = i;
i=0;
for (next = pending_blocks; next; next = next->next)
BLOCKVECTOR_BLOCK (blockvector, i++) = next->block;
/* Now free the links of the list, and empty the list. */
for (next = pending_blocks; next; next = next1)
{
next1 = next->next;
free (next);
}
pending_blocks = 0;
return blockvector;
}
/* Manage the vector of line numbers. */
static
record_line (line, pc)
int line;
CORE_ADDR pc;
{
struct linetable_entry *e;
/* Make sure line vector is big enough. */
if (line_vector_index + 2 >= line_vector_length)
{
line_vector_length *= 2;
line_vector = (struct linetable *)
xrealloc (line_vector, sizeof (struct linetable)
+ (line_vector_length
* sizeof (struct linetable_entry)));
}
e = line_vector->item + line_vector_index++;
e->line = line; e->pc = pc;
}
/* Start a new symtab for a new source file.
This is called when a COFF ".file" symbol is seen;
it indicates the start of data for one original source file. */
static void
start_symtab ()
{
file_symbols = 0;
global_symbols = 0;
context_stack = 0;
within_function = 0;
last_source_file = 0;
/* Initialize the source file information for this file. */
line_vector_index = 0;
line_vector_length = 1000;
prev_line_number = -2; /* Force first line number to be explicit */
line_vector = (struct linetable *)
xmalloc (sizeof (struct linetable)
+ line_vector_length * sizeof (struct linetable_entry));
}
/* 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. */
static void
complete_symtab (name, start_addr, size)
char *name;
CORE_ADDR start_addr;
unsigned int size;
{
last_source_file = savestring (name, strlen (name));
cur_src_start_addr = start_addr;
cur_src_end_addr = start_addr + size;
}
/* Finish the symbol definitions for one main source file,
close off all the lexical contexts for that file
(creating struct block's for them), then make the
struct symtab for that file and put it in the list of all such. */
static void
end_symtab ()
{
register struct symtab *symtab;
register struct context_stack *cstk;
register struct blockvector *blockvector;
register struct linetable *lv;
/* Finish the lexical context of the last function in the file. */
if (context_stack)
{
cstk = context_stack;
context_stack = 0;
/* Make a block for the local symbols within. */
finish_block (cstk->name, &local_symbols, cstk->old_blocks,
cstk->start_addr, cur_src_end_addr);
free (cstk);
}
/* Ignore a file that has no functions with real debugging info. */
if (pending_blocks == 0 && file_symbols == 0 && global_symbols == 0)
{
free (line_vector);
line_vector = 0;
line_vector_length = -1;
last_source_file = 0;
return;
}
/* Create the two top-level blocks for this file. */
finish_block (0, &file_symbols, 0, cur_src_start_addr, cur_src_end_addr);
finish_block (0, &global_symbols, 0, cur_src_start_addr, cur_src_end_addr);
/* Create the blockvector that points to all the file's blocks. */
blockvector = make_blockvector ();
/* Now create the symtab object for this source file. */
symtab = (struct symtab *) xmalloc (sizeof (struct symtab));
symtab->free_ptr = 0;
/* Fill in its components. */
symtab->blockvector = blockvector;
symtab->free_code = free_linetable;
symtab->filename = last_source_file;
lv = line_vector;
lv->nitems = line_vector_index;
symtab->linetable = (struct linetable *)
xrealloc (lv, (sizeof (struct linetable)
+ lv->nitems * sizeof (struct linetable_entry)));
symtab->nlines = 0;
symtab->line_charpos = 0;
/* Link the new symtab into the list of such. */
symtab->next = symtab_list;
symtab_list = symtab;
/* Reinitialize for beginning of new file. */
line_vector = 0;
line_vector_length = -1;
last_source_file = 0;
}
/* Accumulate the misc functions in bunches of 127.
At the end, copy them all into one newly allocated structure. */
#define MISC_BUNCH_SIZE 127
struct misc_bunch
{
struct misc_bunch *next;
struct misc_function contents[MISC_BUNCH_SIZE];
};
/* Bunch currently being filled up.
The next field points to chain of filled bunches. */
static struct misc_bunch *misc_bunch;
/* Number of slots filled in current bunch. */
static int misc_bunch_index;
/* Total number of misc functions recorded so far. */
static int misc_count;
static void
init_misc_functions ()
{
misc_count = 0;
misc_bunch = 0;
misc_bunch_index = MISC_BUNCH_SIZE;
}
static void
record_misc_function (name, address)
char *name;
CORE_ADDR address;
{
register struct misc_bunch *new;
if (misc_bunch_index == MISC_BUNCH_SIZE)
{
new = (struct misc_bunch *) xmalloc (sizeof (struct misc_bunch));
misc_bunch_index = 0;
new->next = misc_bunch;
misc_bunch = new;
}
misc_bunch->contents[misc_bunch_index].name = savestring (name, strlen (name));
misc_bunch->contents[misc_bunch_index].address = address;
misc_bunch_index++;
misc_count++;
}
/* if we see a function symbol, we do record_misc_function.
* however, if it turns out the next symbol is '.bf', then
* we call here to undo the misc definition
*/
static void
unrecord_misc_function ()
{
if (misc_bunch_index == 0)
error ("Internal error processing symbol table, at symbol %d.",
symnum);
misc_bunch_index--;
misc_count--;
}
static int
compare_misc_functions (fn1, fn2)
struct misc_function *fn1, *fn2;
{
/* Return a signed result based on unsigned comparisons
so that we sort into unsigned numeric order. */
if (fn1->address < fn2->address)
return -1;
if (fn1->address > fn2->address)
return 1;
return 0;
}
static void
discard_misc_bunches ()
{
register struct misc_bunch *next;
while (misc_bunch)
{
next = misc_bunch->next;
free (misc_bunch);
misc_bunch = next;
}
}
static void
condense_misc_bunches ()
{
register int i, j;
register struct misc_bunch *bunch;
#ifdef NAMES_HAVE_UNDERSCORE
int offset = 1;
#else
int offset = 0;
#endif
misc_function_vector
= (struct misc_function *)
xmalloc (misc_count * sizeof (struct misc_function));
j = 0;
bunch = misc_bunch;
while (bunch)
{
for (i = 0; i < misc_bunch_index; i++)
{
register char *tmp;
misc_function_vector[j] = bunch->contents[i];
tmp = misc_function_vector[j].name;
misc_function_vector[j].name = (tmp[0] == '_' ? tmp + offset : tmp);
j++;
}
bunch = bunch->next;
misc_bunch_index = MISC_BUNCH_SIZE;
}
misc_function_count = j;
/* Sort the misc functions by address. */
qsort (misc_function_vector, j, sizeof (struct misc_function),
compare_misc_functions);
}
/* Call sort_syms to sort alphabetically
the symbols of each block of each symtab. */
static int
compare_symbols (s1, s2)
struct symbol **s1, **s2;
{
/* Names that are less should come first. */
register int namediff = strcmp (SYMBOL_NAME (*s1), SYMBOL_NAME (*s2));
if (namediff != 0) return namediff;
/* For symbols of the same name, registers should come first. */
return ((SYMBOL_CLASS (*s2) == LOC_REGISTER)
- (SYMBOL_CLASS (*s1) == LOC_REGISTER));
}
static void
sort_syms ()
{
register struct symtab *s;
register int i, nbl;
register struct blockvector *bv;
register struct block *b;
for (s = symtab_list; s; s = s->next)
{
bv = BLOCKVECTOR (s);
nbl = BLOCKVECTOR_NBLOCKS (bv);
for (i = 0; i < nbl; i++)
{
b = BLOCKVECTOR_BLOCK (bv, i);
if (BLOCK_SHOULD_SORT (b))
qsort (&BLOCK_SYM (b, 0), BLOCK_NSYMS (b),
sizeof (struct symbol *), compare_symbols);
}
}
}
/* This is the symbol-file command. Read the file, analyze its symbols,
and add a struct symtab to symtab_list. */
void
symbol_file_command (name)
char *name;
{
int desc;
int num_symbols;
int num_sections;
int symtab_offset;
extern void close ();
register int val;
struct cleanup *old_chain;
dont_repeat ();
if (name == 0)
{
if (symtab_list && !query ("Discard symbol table? ", 0))
error ("Not confirmed.");
free_all_symtabs ();
return;
}
if (symtab_list && !query ("Load new symbol table from \"%s\"? ", name))
error ("Not confirmed.");
if (symfile)
free (symfile);
symfile = 0;
{
char *absolute_name;
desc = openp (getenv ("PATH"), 1, name, O_RDONLY, 0, &absolute_name);
if (desc < 0)
perror_with_name (name);
else
name = absolute_name;
}
old_chain = make_cleanup (close, desc);
make_cleanup (free_current_contents, &name);
if ((num_symbols = read_file_hdr (desc, &file_hdr)) < 0)
#ifdef ti1500
error ("File \"%s\" not executable, num_symbols = %d.", name, num_symbols);
#else
error ("File \"%s\" not in executable format.", name);
#endif
if (num_symbols == 0)
{
free_all_symtabs ();
printf ("%s does not have a symbol-table.\n", name);
fflush (stdout);
return;
}
printf ("Reading symbol data from %s...", name);
fflush (stdout);
/* Throw away the old symbol table. */
free_all_symtabs ();
free_all_psymtabs (); /* Make sure that partial_symtab_list */
/* is 0 also. */
num_sections = file_hdr.f_nscns;
symtab_offset = file_hdr.f_symptr;
if (read_section_hdr (desc, _TEXT, &text_hdr, num_sections) < 0)
error ("\"%s\": can't read text section header", name);
/* Read the line number table, all at once. */
val = init_lineno (desc, text_hdr.s_lnnoptr, text_hdr.s_nlnno);
if (val < 0)
error ("\"%s\": error reading line numbers\n", name);
/* Now read the string table, all at once. */
val = init_stringtab (desc, symtab_offset + num_symbols * SYMESZ);
if (val < 0)
{
free_all_symtabs ();
printf ("\"%s\": can't get string table", name);
fflush (stdout);
return;
}
make_cleanup (free_stringtab, 0);
/* Position to read the symbol table. Do not read it all at once. */
val = lseek (desc, (long)symtab_offset, 0);
if (val < 0)
perror_with_name (name);
init_misc_functions ();
make_cleanup (discard_misc_bunches, 0);
/* Now that the executable file is positioned at symbol table,
process it and define symbols accordingly. */
read_coff_symtab (desc, num_symbols);
patch_opaque_types ();
/* Sort symbols alphabetically within each block. */
sort_syms ();
/* Go over the misc functions and install them in vector. */
condense_misc_bunches ();
/* Don't allow char * to have a typename (else would get caddr_t.) */
TYPE_NAME (lookup_pointer_type (builtin_type_char)) = 0;
/* Make a default for file to list. */
select_source_symtab (symtab_list);
symfile = savestring (name, strlen (name));
do_cleanups (old_chain);
printf ("done.\n");
fflush (stdout);
}
/* Return name of file symbols were loaded from, or 0 if none.. */
char *
get_sym_file ()
{
return symfile;
}
/* Simplified internal version of coff symbol table information */
struct coff_symbol {
char *c_name;
int c_symnum; /* symbol number of this entry */
int c_nsyms; /* 1 if syment only, 2 if syment + auxent */
long c_value;
int c_sclass;
int c_secnum;
unsigned int c_type;
};
/* Given pointers to a symbol table in coff style exec file,
analyze them and create struct symtab's describing the symbols.
NSYMS is the number of symbols in the symbol table.
We read them one at a time using read_one_sym (). */
static void
read_coff_symtab (desc, nsyms)
int desc;
int nsyms;
{
int newfd; /* Avoid multiple closes on same desc */
FILE *stream;
register struct context_stack *new;
struct coff_symbol coff_symbol;
register struct coff_symbol *cs = &coff_symbol;
static SYMENT main_sym;
static AUXENT main_aux;
struct coff_symbol fcn_cs_saved;
static SYMENT fcn_sym_saved;
static AUXENT fcn_aux_saved;
int num_object_files = 0;
int next_file_symnum = -1;
char *filestring;
int depth;
int fcn_first_line;
int fcn_last_line;
int fcn_start_addr;
long fcn_line_ptr;
struct cleanup *old_chain;
#ifdef ti1500
static char c_source[100];
static char previous_source[100];
int index_c_src;
int found=0;
int i,j;
#endif
newfd = dup (desc);
if (newfd == -1)
fatal ("Too many open files");
stream = fdopen (newfd, "r");
old_chain = make_cleanup (free_all_symtabs, 0);
make_cleanup (fclose, stream);
nlist_stream_global = stream;
nlist_nsyms_global = nsyms;
last_source_file = 0;
bzero (opaque_type_chain, sizeof opaque_type_chain);
type_vector_length = 160;
type_vector = (struct typevector *)
xmalloc (sizeof (struct typevector)
+ type_vector_length * sizeof (struct type *));
bzero (type_vector->type, type_vector_length * sizeof (struct type *));
start_symtab ();
symnum = 0;
while (symnum < nsyms)
{
QUIT; /* Make this command interruptable. */
read_one_sym (cs, &main_sym, &main_aux);
#ifdef ti1500
/* Have to create a symbol table for each C source file */
if (cs->c_symnum == next_file_symnum )
#else
if (cs->c_symnum == next_file_symnum && cs->c_sclass != C_FILE)
#endif
{
CORE_ADDR last_file_end = cur_src_end_addr;
#ifdef ti1500
if (c_source[0] != '\0')
complete_symtab (c_source, 0, first_object_file_end);
#else
complete_symtab ("_globals_", 0, first_object_file_end);
#endif
/* done with all files, everything from here on out is globals */
if ((last_source_file) && (c_source != previous_source))
{
end_symtab ();
if (c_source[0] != '\0')
strcpy(previous_source,c_source);
for(index_c_src =0; index_c_src < 100; index_c_src++)
c_source[index_c_src] = '\0';
}
start_symtab ();
}
/* Special case for file with type declarations only, no text. */
if (!last_source_file && cs->c_type != T_NULL && cs->c_secnum == N_DEBUG)
complete_symtab (filestring, 0, 0);
/* Typedefs should not be treated as symbol definitions. */
if (ISFCN (cs->c_type) && cs->c_sclass != C_TPDEF)
{
/* record as misc function. if we get '.bf' next,
* then we undo this step
*/
record_misc_function (cs->c_name, cs->c_value);
fcn_line_ptr = main_aux.x_sym.x_fcnary.x_fcn.x_lnnoptr;
fcn_start_addr = cs->c_value;
fcn_cs_saved = *cs;
fcn_sym_saved = main_sym;
fcn_aux_saved = main_aux;
continue;
}
switch (cs->c_sclass)
{
case C_EFCN:
case C_EXTDEF:
case C_ULABEL:
case C_USTATIC:
case C_LINE:
case C_ALIAS:
case C_HIDDEN:
printf ("Bad n_sclass = %d\n", cs->c_sclass);
break;
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;
filestring = getfilename (&main_aux);
#ifdef ti1500
i = 1;
while (!found && filestring[i] != '\0')
{
if (filestring[i] == 'c')
if (filestring[i-1] =='.')
found = 1;
i = i + 1;
}
if (found)
{
for(j=0;j<i;j++)
c_source[j] = filestring[j];
found = 0;
}
#endif
/*
* Complete symbol table for last object file
* containing debugging information.
*/
if (last_source_file)
{
end_symtab ();
start_symtab ();
}
num_object_files++;
break;
case C_STAT:
if (cs->c_name[0] == '.') {
if (strcmp (cs->c_name, _TEXT) == 0) {
if (num_object_files == 1) {
/* last address of startup file */
first_object_file_end = cs->c_value +
main_aux.x_scn.x_scnlen;
}
/* for some reason the old code didn't do
* this if this section entry had
* main_aux.x_scn.x_nlinno equal to 0
*/
complete_symtab (filestring, cs->c_value,