/* Read dbx symbol tables and convert to internal format, for GDB.
- Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994
+ Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995
Free Software Foundation, Inc.
This file is part of GDB.
#include "command.h"
#include "target.h"
#include "gdbcore.h" /* for bfd stuff */
-#include "libbfd.h" /* FIXME Secret internal BFD stuff (bfd_read) */
#include "libaout.h" /* FIXME Secret internal BFD stuff for a.out */
#include "symfile.h"
#include "objfiles.h"
#define SEEK_SET 0
#define SEEK_CUR 1
#endif
-
+\f
/* Each partial symbol table entry contains a pointer to private data for the
- read_symtab() function to use when expanding a partial symbol table entry
- to a full symbol table entry.
+ sym_read function to use when expanding a partial symbol table entry
+ to a full symbol table entry. */
- For dbxread this structure contains the offset within the file symbol table
- of first local symbol for this file, and length (in bytes) of 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). It also contains
- further information needed to locate the symbols if they are in an ELF file.
+struct symloc {
- If ldsymlen is 0, the only reason for this thing's existence is the
- dependency list. Nothing else will happen when it is read in. */
+ /* Offset within the file symbol table of first local symbol for this
+ file. */
-#define LDSYMOFF(p) (((struct symloc *)((p)->read_symtab_private))->ldsymoff)
-#define LDSYMLEN(p) (((struct symloc *)((p)->read_symtab_private))->ldsymlen)
-#define SYMLOC(p) ((struct symloc *)((p)->read_symtab_private))
-#define SYMBOL_SIZE(p) (SYMLOC(p)->symbol_size)
-#define SYMBOL_OFFSET(p) (SYMLOC(p)->symbol_offset)
-#define STRING_OFFSET(p) (SYMLOC(p)->string_offset)
-#define FILE_STRING_OFFSET(p) (SYMLOC(p)->file_string_offset)
-
-struct symloc {
int ldsymoff;
+
+ /* Length (in bytes) of 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 ldsymlen is 0, the only
+ reason for this thing's existence is the dependency list. Nothing
+ else will happen when it is read in. */
+
int ldsymlen;
+
+ /* The size of each symbol in the symbol file (in external form). */
+
int symbol_size;
+
+ /* Further information needed to locate the symbols if they are in
+ an ELF file. */
+
int symbol_offset;
int string_offset;
int file_string_offset;
};
+#define LDSYMOFF(p) (((struct symloc *)((p)->read_symtab_private))->ldsymoff)
+#define LDSYMLEN(p) (((struct symloc *)((p)->read_symtab_private))->ldsymlen)
+#define SYMLOC(p) ((struct symloc *)((p)->read_symtab_private))
+#define SYMBOL_SIZE(p) (SYMLOC(p)->symbol_size)
+#define SYMBOL_OFFSET(p) (SYMLOC(p)->symbol_offset)
+#define STRING_OFFSET(p) (SYMLOC(p)->string_offset)
+#define FILE_STRING_OFFSET(p) (SYMLOC(p)->file_string_offset)
+
+\f
/* Macro to determine which symbols to ignore when reading the first symbol
of a file. Some machines override this definition. */
#ifndef IGNORE_SYMBOL
static int block_address_function_relative = 0;
\f
-/* This is the lowest text address we have yet encountered. */
+/* The lowest text address we have yet encountered. This is needed
+ because in an a.out file, there is no header field which tells us
+ what address the program is actually going to be loaded at, so we
+ need to make guesses based on the symbols (which *are* relocated to
+ reflect the address it will be loaded at). */
static CORE_ADDR lowest_text_address;
/* Complaints about the symbols we have encountered. */
{"N_LBRAC/N_RBRAC symbol mismatch at symtab pos %d", 0, 0};
struct complaint repeated_header_complaint =
- {"\"repeated\" header file not previously seen, at symtab pos %d", 0, 0};
-
-struct complaint repeated_header_name_complaint =
- {"\"repeated\" header file not previously seen, named %s", 0, 0};
+ {"\"repeated\" header file %s not previously seen, at symtab pos %d", 0, 0};
\f
/* During initial symbol readin, we need to have a structure to keep
track of which psymtabs have which bincls in them. This structure
static void
init_bincl_list PARAMS ((int, struct objfile *));
-static void
-init_psymbol_list PARAMS ((struct objfile *));
-
static char *
dbx_next_symbol_text PARAMS ((void));
add_this_object_header_file (i);
return;
}
- complain (&repeated_header_complaint, symnum);
- complain (&repeated_header_name_complaint, name);
+ complain (&repeated_header_complaint, name, symnum);
}
/* Add to this file a "new" header file: definitions for its types follow.
perror_with_name (objfile->name);
/* 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)
- init_psymbol_list (objfile);
+ if (mainline
+ || objfile->global_psymbols.size == 0
+ || objfile->static_psymbols.size == 0)
+ init_psymbol_list (objfile, DBX_SYMCOUNT (objfile));
symbol_size = DBX_SYMBOL_SIZE (objfile);
symbol_table_offset = DBX_SYMTAB_OFFSET (objfile);
bfd_section_vma (sym_bfd, DBX_TEXT_SECT (objfile)),
bfd_section_size (sym_bfd, DBX_TEXT_SECT (objfile)));
- /* Add the dynamic symbols if we are reading the main symbol table. */
+ /* Add the dynamic symbols. */
- if (mainline)
- read_dbx_dynamic_symtab (section_offsets, objfile);
+ read_dbx_dynamic_symtab (section_offsets, objfile);
/* Install any minimal symbols that have been collected as the current
minimal symbols for this objfile. */
install_minimal_symbols (objfile);
- if (!have_partial_symbols ()) {
- wrap_here ("");
- printf_filtered ("(no debugging symbols found)...");
- wrap_here ("");
- }
-
do_cleanups (back_to);
}
/* The address in memory of the string table of the object file we are
reading (which might not be the "main" object file, but might be a
- shared library or some other dynamically loaded thing). This is set
- by read_dbx_symtab when building psymtabs, and by read_ofile_symtab
- when building symtabs, and is used only by next_symbol_text. */
+ shared library or some other dynamically loaded thing). This is
+ set by read_dbx_symtab when building psymtabs, and by
+ read_ofile_symtab when building symtabs, and is used only by
+ next_symbol_text. FIXME: If that is true, we don't need it when
+ building psymtabs, right? */
static char *stringtab_global;
/* Refill the symbol table input buffer
+ file_string_table_offset;
}
\f
-/* Initializes storage for all of the partial symbols that will be
- created by read_dbx_symtab and subsidiaries. */
-
-static void
-init_psymbol_list (objfile)
- struct objfile *objfile;
-{
- /* Free any previously allocated psymbol lists. */
- if (objfile -> global_psymbols.list)
- mfree (objfile -> md, (PTR)objfile -> global_psymbols.list);
- if (objfile -> static_psymbols.list)
- mfree (objfile -> md, (PTR)objfile -> static_psymbols.list);
-
- /* Current best guess is that there are approximately a twentieth
- of the total symbols (in a debugging file) are global or static
- oriented symbols */
- objfile -> global_psymbols.size = DBX_SYMCOUNT (objfile) / 10;
- objfile -> static_psymbols.size = DBX_SYMCOUNT (objfile) / 10;
- objfile -> global_psymbols.next = objfile -> global_psymbols.list = (struct partial_symbol *)
- xmmalloc (objfile -> md, objfile -> global_psymbols.size * sizeof (struct partial_symbol));
- objfile -> static_psymbols.next = objfile -> static_psymbols.list = (struct partial_symbol *)
- xmmalloc (objfile -> md, objfile -> static_psymbols.size * sizeof (struct partial_symbol));
-}
-
/* Initialize the list of bincls to contain none and have some
allocated. */
&& STREQ (name, bincl->name))
return bincl->pst;
+ complain (&repeated_header_complaint, name, symnum);
return (struct partial_symtab *) 0;
}
long dynrel_count;
arelent **dynrels;
CORE_ADDR sym_value;
+ char *name;
/* Check that the symbol file has dynamic symbols that we know about.
bfd_arch_unknown can happen if we are reading a sun3 symbol file
counter++, relptr++)
{
arelent *rel = *relptr;
- CORE_ADDR address = rel->address;
+ CORE_ADDR address =
+ rel->address + ANOFFSET (section_offsets, SECT_OFF_DATA);
switch (bfd_get_arch (abfd))
{
continue;
}
- prim_record_minimal_symbol (bfd_asymbol_name (*rel->sym_ptr_ptr),
- address,
- mst_solib_trampoline,
- objfile);
+ name = (char *) bfd_asymbol_name (*rel->sym_ptr_ptr);
+ prim_record_minimal_symbol
+ (obsavestring (name, strlen (name), &objfile -> symbol_obstack),
+ address,
+ mst_solib_trampoline,
+ objfile);
}
do_cleanups (back_to);
LDSYMLEN(pst) = capping_symbol_offset - LDSYMOFF(pst);
pst->texthigh = capping_text;
-#ifdef N_SO_ADDRESS_MAYBE_MISSING
+#ifdef SOFUN_ADDRESS_MAYBE_MISSING
/* Under Solaris, the N_SO symbols always have a value of 0,
instead of the usual address of the .o file. Therefore,
we have to do some tricks to fill in texthigh and textlow.
The first trick is in partial-stab.h: if we see a static
or global function, and the textlow for the current pst
is still 0, then we use that function's address for
- the textlow of the pst.
+ the textlow of the pst. */
- Now, to fill in texthigh, we remember the last function seen
+ /* Now, to fill in texthigh, we remember the last function seen
in the .o file (also in partial-stab.h). Also, there's a hack in
bfd/elf.c and gdb/elfread.c to pass the ELF st_size field
to here via the misc_info field. Therefore, we can fill in
a reliable texthigh by taking the address plus size of the
- last function in the file.
-
- Unfortunately, that does not cover the case where the last function
- in the file is static. See the paragraph below for more comments
- on this situation.
-
- Finally, if we have a valid textlow for the current file, we run
- down the partial_symtab_list filling in previous texthighs that
- are still unknown. */
+ last function in the file. */
if (pst->texthigh == 0 && last_function_name) {
char *p;
strncpy (p, last_function_name, n);
p[n] = 0;
- minsym = lookup_minimal_symbol (p, objfile);
+ minsym = lookup_minimal_symbol (p, pst->filename, objfile);
- if (minsym) {
+ if (minsym)
pst->texthigh = SYMBOL_VALUE_ADDRESS (minsym) +
(long) MSYMBOL_INFO (minsym);
- } else {
- /* This file ends with a static function, and it's
- difficult to imagine how hard it would be to track down
- the elf symbol. Luckily, most of the time no one will notice,
- since the next file will likely be compiled with -g, so
- the code below will copy the first fuction's start address
- back to our texthigh variable. (Also, if this file is the
- last one in a dynamically linked program, texthigh already
- has the right value.) If the next file isn't compiled
- with -g, then the last function in this file winds up owning
- all of the text space up to the next -g file, or the end (minus
- shared libraries). This only matters for single stepping,
- and even then it will still work, except that it will single
- step through all of the covered functions, instead of setting
- breakpoints around them as it usualy does. This makes it
- pretty slow, but at least it doesn't fail.
-
- We can fix this with a fairly big change to bfd, but we need
- to coordinate better with Cygnus if we want to do that. FIXME. */
- }
+
last_function_name = NULL;
}
if (pst->textlow == 0)
/* This loses if the text section really starts at address zero
(generally true when we are debugging a .o file, for example).
- That is why this whole thing is inside N_SO_ADDRESS_MAYBE_MISSING. */
+ That is why this whole thing is inside SOFUN_ADDRESS_MAYBE_MISSING. */
pst->textlow = pst->texthigh;
/* If we know our own starting text address, then walk through all other
}
/* End of kludge for patching Solaris textlow and texthigh. */
-#endif /* N_SO_ADDRESS_MAYBE_MISSING. */
+#endif /* SOFUN_ADDRESS_MAYBE_MISSING. */
pst->n_global_syms =
objfile->global_psymbols.next - (objfile->global_psymbols.list + pst->globals_offset);
/* This "symbol" just indicates the start of an inner lexical
context within a function. */
+ /* Ignore extra outermost context from SunPRO cc and acc. */
+ if (n_opt_found && desc == 1)
+ break;
+
#if defined(BLOCK_ADDRESS_ABSOLUTE)
/* Relocate for dynamic loading (?). */
valu += function_start_offset;
/* This "symbol" just indicates the end of an inner lexical
context that was started with N_LBRAC. */
+ /* Ignore extra outermost context from SunPRO cc and acc. */
+ if (n_opt_found && desc == 1)
+ break;
+
#if defined(BLOCK_ADDRESS_ABSOLUTE)
/* Relocate for dynamic loading (?). */
valu += function_start_offset;
case 'F':
function_stab_type = type;
+#ifdef SOFUN_ADDRESS_MAYBE_MISSING
+ /* Deal with the SunPRO 3.0 compiler which omits the address
+ from N_FUN symbols. */
+ if (type == N_FUN
+ && valu == ANOFFSET (section_offsets, SECT_OFF_TEXT))
+ {
+ struct minimal_symbol *msym;
+ char *p;
+ int n;
+
+ p = strchr (name, ':');
+ if (p == NULL)
+ p = name;
+ n = p - name;
+ p = alloca (n + 1);
+ strncpy (p, name, n);
+ p[n] = 0;
+
+ msym = lookup_minimal_symbol (p, last_source_file,
+ objfile);
+ if (msym)
+ valu = SYMBOL_VALUE_ADDRESS (msym);
+ }
+#endif
+
#ifdef SUN_FIXED_LBRAC_BUG
/* The Sun acc compiler, under SunOS4, puts out
functions with N_GSYM or N_STSYM. The problem is
previous function. This means that we can use the
minimal symbol table to get the address. */
- /* On solaris up to 2.2, the N_FUN stab gets relocated.
- On Solaris 2.3, ld no longer relocates stabs (which
- is good), and the N_FUN's value is now always zero.
- The following code can't deal with this, because
- last_pc_address depends on getting the address from a
- N_SLINE or some such and in Solaris those are function
- relative. Best fix is probably to create a Ttext.text symbol
- and handle this like Ddata.data and so on. */
-
- if (type == N_GSYM || type == N_STSYM)
+ /* Starting with release 3.0, the Sun acc compiler,
+ under SunOS4, puts out functions with N_FUN and a value
+ of zero. This gets relocated to the start of the text
+ segment of the module, which is no good either.
+ Under SunOS4 we can deal with this as N_SLINE and N_SO
+ entries contain valid absolute addresses.
+ Release 3.0 acc also puts out N_OPT entries, which makes
+ it possible to discern acc from cc or gcc. */
+
+ if (type == N_GSYM || type == N_STSYM
+ || (type == N_FUN
+ && n_opt_found && !block_address_function_relative))
{
struct minimal_symbol *m;
int l = colon_pos - name;