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a679650f37
* dwarfread.c (scan_partial_symbols): Skip over DIE's within function scopes when building partial symbol tables. * objfiles.c (open_existing_mapped_file): Make it clear in warning message that out of date mapped files are ignored. * symtab.c (lookup_symtab_1, lookup_symbol): Print compilation unit source file name in error message.
572 lines
18 KiB
C
572 lines
18 KiB
C
/* GDB routines for manipulating objfiles.
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Copyright 1992 Free Software Foundation, Inc.
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Contributed by Cygnus Support, using pieces from other GDB modules.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* This file contains support routines for creating, manipulating, and
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destroying objfile structures. */
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#include "defs.h"
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#include "bfd.h" /* Binary File Description */
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#include "symtab.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <obstack.h>
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/* Prototypes for local functions */
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#if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
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static int
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open_existing_mapped_file PARAMS ((char *, long, int));
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static int
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open_mapped_file PARAMS ((char *filename, long mtime, int mapped));
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static CORE_ADDR
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map_to_address PARAMS ((void));
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#endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
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/* Message to be printed before the error message, when an error occurs. */
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extern char *error_pre_print;
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/* Externally visible variables that are owned by this module.
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See declarations in objfile.h for more info. */
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struct objfile *object_files; /* Linked list of all objfiles */
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struct objfile *current_objfile; /* For symbol file being read in */
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struct objfile *symfile_objfile; /* Main symbol table loaded from */
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int mapped_symbol_files; /* Try to use mapped symbol files */
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/* Given a pointer to an initialized bfd (ABFD) and a flag that indicates
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whether or not an objfile is to be mapped (MAPPED), allocate a new objfile
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struct, fill it in as best we can, link it into the list of all known
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objfiles, and return a pointer to the new objfile struct. */
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struct objfile *
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allocate_objfile (abfd, mapped)
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bfd *abfd;
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int mapped;
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{
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struct objfile *objfile = NULL;
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int fd;
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void *md;
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CORE_ADDR mapto;
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mapped |= mapped_symbol_files;
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#if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
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/* If we can support mapped symbol files, try to open/reopen the mapped file
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that corresponds to the file from which we wish to read symbols. If the
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objfile is to be mapped, we must malloc the structure itself using the
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mmap version, and arrange that all memory allocation for the objfile uses
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the mmap routines. If we are reusing an existing mapped file, from which
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we get our objfile pointer, we have to make sure that we update the
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pointers to the alloc/free functions in the obstack, in case these
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functions have moved within the current gdb. */
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fd = open_mapped_file (bfd_get_filename (abfd), bfd_get_mtime (abfd),
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mapped);
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if (fd >= 0)
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{
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if (((mapto = map_to_address ()) == 0) ||
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((md = mmalloc_attach (fd, (void *) mapto)) == NULL))
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{
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close (fd);
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}
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else if ((objfile = (struct objfile *) mmalloc_getkey (md, 0)) != NULL)
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{
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/* Update memory corruption handler function addresses. */
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init_malloc (md);
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objfile -> md = md;
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objfile -> mmfd = fd;
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/* Update pointers to functions to *our* copies */
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obstack_chunkfun (&objfile -> psymbol_obstack, xmmalloc);
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obstack_freefun (&objfile -> psymbol_obstack, mfree);
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obstack_chunkfun (&objfile -> symbol_obstack, xmmalloc);
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obstack_freefun (&objfile -> symbol_obstack, mfree);
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obstack_chunkfun (&objfile -> type_obstack, xmmalloc);
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obstack_freefun (&objfile -> type_obstack, mfree);
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/* If already in objfile list, unlink it. */
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unlink_objfile (objfile);
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/* Forget things specific to a particular gdb, may have changed. */
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objfile -> sf = NULL;
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}
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else
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{
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/* Set up to detect internal memory corruption. MUST be done before
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the first malloc. See comments in init_malloc() and mmcheck(). */
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init_malloc (md);
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objfile = (struct objfile *) xmmalloc (md, sizeof (struct objfile));
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memset (objfile, 0, sizeof (struct objfile));
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objfile -> md = md;
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objfile -> mmfd = fd;
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objfile -> flags |= OBJF_MAPPED;
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mmalloc_setkey (objfile -> md, 0, objfile);
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obstack_specify_allocation_with_arg (&objfile -> psymbol_obstack,
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0, 0, xmmalloc, mfree,
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objfile -> md);
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obstack_specify_allocation_with_arg (&objfile -> symbol_obstack,
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0, 0, xmmalloc, mfree,
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objfile -> md);
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obstack_specify_allocation_with_arg (&objfile -> type_obstack,
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0, 0, xmmalloc, mfree,
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objfile -> md);
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}
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}
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if (mapped && (objfile == NULL))
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{
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warning ("symbol table for '%s' will not be mapped",
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bfd_get_filename (abfd));
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}
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#else /* defined(NO_MMALLOC) || !defined(HAVE_MMAP) */
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if (mapped)
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{
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warning ("this version of gdb does not support mapped symbol tables.");
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/* Turn off the global flag so we don't try to do mapped symbol tables
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any more, which shuts up gdb unless the user specifically gives the
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"mapped" keyword again. */
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mapped_symbol_files = 0;
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}
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#endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
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/* If we don't support mapped symbol files, didn't ask for the file to be
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mapped, or failed to open the mapped file for some reason, then revert
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back to an unmapped objfile. */
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if (objfile == NULL)
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{
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objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
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memset (objfile, 0, sizeof (struct objfile));
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objfile -> md = NULL;
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obstack_specify_allocation (&objfile -> psymbol_obstack, 0, 0, xmalloc,
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free);
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obstack_specify_allocation (&objfile -> symbol_obstack, 0, 0, xmalloc,
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free);
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obstack_specify_allocation (&objfile -> type_obstack, 0, 0, xmalloc,
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free);
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}
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/* Update the per-objfile information that comes from the bfd, ensuring
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that any data that is reference is saved in the per-objfile data
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region. */
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objfile -> obfd = abfd;
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if (objfile -> name != NULL)
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{
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mfree (objfile -> md, objfile -> name);
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}
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objfile -> name = mstrsave (objfile -> md, bfd_get_filename (abfd));
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objfile -> mtime = bfd_get_mtime (abfd);
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/* Push this file onto the head of the linked list of other such files. */
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objfile -> next = object_files;
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object_files = objfile;
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return (objfile);
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}
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/* Unlink OBJFILE from the list of known objfiles, if it is found in the
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list.
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It is not a bug, or error, to call this function if OBJFILE is not known
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to be in the current list. This is done in the case of mapped objfiles,
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for example, just to ensure that the mapped objfile doesn't appear twice
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in the list. Since the list is threaded, linking in a mapped objfile
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twice would create a circular list.
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If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
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unlinking it, just to ensure that we have completely severed any linkages
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between the OBJFILE and the list. */
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void
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unlink_objfile (objfile)
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struct objfile *objfile;
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{
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struct objfile** objpp;
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for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp) -> next))
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{
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if (*objpp == objfile)
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{
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*objpp = (*objpp) -> next;
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objfile -> next = NULL;
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break;
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}
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}
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}
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/* Destroy an objfile and all the symtabs and psymtabs under it. Note
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that as much as possible is allocated on the symbol_obstack and
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psymbol_obstack, so that the memory can be efficiently freed.
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Things which we do NOT free because they are not in malloc'd memory
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or not in memory specific to the objfile include:
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objfile -> sf
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FIXME: If the objfile is using reusable symbol information (via mmalloc),
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then we need to take into account the fact that more than one process
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may be using the symbol information at the same time (when mmalloc is
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extended to support cooperative locking). When more than one process
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is using the mapped symbol info, we need to be more careful about when
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we free objects in the reusable area. */
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void
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free_objfile (objfile)
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struct objfile *objfile;
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{
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int mmfd;
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/* First do any symbol file specific actions required when we are
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finished with a particular symbol file. Note that if the objfile
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is using reusable symbol information (via mmalloc) then each of
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these routines is responsible for doing the correct thing, either
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freeing things which are valid only during this particular gdb
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execution, or leaving them to be reused during the next one. */
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if (objfile -> sf != NULL)
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{
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(*objfile -> sf -> sym_finish) (objfile);
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}
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/* We always close the bfd. */
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if (objfile -> obfd != NULL)
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{
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char *name = bfd_get_filename (objfile->obfd);
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bfd_close (objfile -> obfd);
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free (name);
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}
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/* Remove it from the chain of all objfiles. */
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unlink_objfile (objfile);
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/* Before the symbol table code was redone to make it easier to
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selectively load and remove information particular to a specific
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linkage unit, gdb used to do these things whenever the monolithic
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symbol table was blown away. How much still needs to be done
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is unknown, but we play it safe for now and keep each action until
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it is shown to be no longer needed. */
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clear_symtab_users_once ();
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#if defined (CLEAR_SOLIB)
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CLEAR_SOLIB ();
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#endif
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clear_pc_function_cache ();
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/* The last thing we do is free the objfile struct itself for the
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non-reusable case, or detach from the mapped file for the reusable
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case. Note that the mmalloc_detach or the mfree is the last thing
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we can do with this objfile. */
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#if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
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if (objfile -> flags & OBJF_MAPPED)
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{
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/* Remember the fd so we can close it. We can't close it before
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doing the detach, and after the detach the objfile is gone. */
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mmfd = objfile -> mmfd;
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mmalloc_detach (objfile -> md);
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objfile = NULL;
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close (mmfd);
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}
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#endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
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/* If we still have an objfile, then either we don't support reusable
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objfiles or this one was not reusable. So free it normally. */
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if (objfile != NULL)
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{
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if (objfile -> name != NULL)
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{
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mfree (objfile -> md, objfile -> name);
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}
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if (objfile->global_psymbols.list)
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mfree (objfile->md, objfile->global_psymbols.list);
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if (objfile->static_psymbols.list)
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mfree (objfile->md, objfile->static_psymbols.list);
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/* Free the obstacks for non-reusable objfiles */
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obstack_free (&objfile -> psymbol_obstack, 0);
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obstack_free (&objfile -> symbol_obstack, 0);
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obstack_free (&objfile -> type_obstack, 0);
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mfree (objfile -> md, objfile);
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objfile = NULL;
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}
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}
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/* Free all the object files at once. */
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void
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free_all_objfiles ()
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{
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struct objfile *objfile, *temp;
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ALL_OBJFILES_SAFE (objfile, temp)
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{
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free_objfile (objfile);
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}
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}
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/* Many places in gdb want to test just to see if we have any partial
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symbols available. This function returns zero if none are currently
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available, nonzero otherwise. */
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int
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have_partial_symbols ()
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{
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struct objfile *ofp;
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ALL_OBJFILES (ofp)
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{
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if (ofp -> psymtabs != NULL)
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{
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return 1;
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}
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}
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return 0;
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}
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/* Many places in gdb want to test just to see if we have any full
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symbols available. This function returns zero if none are currently
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available, nonzero otherwise. */
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int
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have_full_symbols ()
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{
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struct objfile *ofp;
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ALL_OBJFILES (ofp)
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{
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if (ofp -> symtabs != NULL)
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{
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return 1;
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}
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}
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return 0;
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}
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/* Many places in gdb want to test just to see if we have any minimal
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symbols available. This function returns zero if none are currently
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available, nonzero otherwise. */
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int
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have_minimal_symbols ()
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{
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struct objfile *ofp;
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ALL_OBJFILES (ofp)
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{
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if (ofp -> msymbols != NULL)
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{
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return 1;
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}
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}
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return 0;
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}
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#if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
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/* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
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of the corresponding symbol file in MTIME, try to open an existing file
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with the name SYMSFILENAME and verify it is more recent than the base
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file by checking it's timestamp against MTIME.
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If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
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If SYMSFILENAME does exist, but is out of date, we check to see if the
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user has specified creation of a mapped file. If so, we don't issue
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any warning message because we will be creating a new mapped file anyway,
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overwriting the old one. If not, then we issue a warning message so that
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the user will know why we aren't using this existing mapped symbol file.
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In either case, we return -1.
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If SYMSFILENAME does exist and is not out of date, but can't be opened for
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some reason, then prints an appropriate system error message and returns -1.
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Otherwise, returns the open file descriptor. */
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static int
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open_existing_mapped_file (symsfilename, mtime, mapped)
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char *symsfilename;
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long mtime;
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int mapped;
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{
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int fd = -1;
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struct stat sbuf;
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if (stat (symsfilename, &sbuf) == 0)
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{
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if (sbuf.st_mtime < mtime)
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{
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if (!mapped)
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{
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warning ("mapped symbol file `%s' is out of date, ignored it",
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symsfilename);
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}
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}
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else if ((fd = open (symsfilename, O_RDWR)) < 0)
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{
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if (error_pre_print)
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{
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printf (error_pre_print);
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}
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print_sys_errmsg (symsfilename, errno);
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}
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}
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return (fd);
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}
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/* Look for a mapped symbol file that corresponds to FILENAME and is more
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recent than MTIME. If MAPPED is nonzero, the user has asked that gdb
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use a mapped symbol file for this file, so create a new one if one does
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not currently exist.
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If found, then return an open file descriptor for the file, otherwise
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return -1.
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This routine is responsible for implementing the policy that generates
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the name of the mapped symbol file from the name of a file containing
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symbols that gdb would like to read. Currently this policy is to append
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".syms" to the name of the file.
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This routine is also responsible for implementing the policy that
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determines where the mapped symbol file is found (the search path).
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This policy is that when reading an existing mapped file, a file of
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the correct name in the current directory takes precedence over a
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file of the correct name in the same directory as the symbol file.
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When creating a new mapped file, it is always created in the current
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directory. This helps to minimize the chances of a user unknowingly
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creating big mapped files in places like /bin and /usr/local/bin, and
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allows a local copy to override a manually installed global copy (in
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/bin for example). */
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static int
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open_mapped_file (filename, mtime, mapped)
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char *filename;
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long mtime;
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int mapped;
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{
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int fd;
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char *symsfilename;
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/* First try to open an existing file in the current directory, and
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then try the directory where the symbol file is located. */
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symsfilename = concat ("./", basename (filename), ".syms", (char *) NULL);
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if ((fd = open_existing_mapped_file (symsfilename, mtime, mapped)) < 0)
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{
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free (symsfilename);
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symsfilename = concat (filename, ".syms", (char *) NULL);
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fd = open_existing_mapped_file (symsfilename, mtime, mapped);
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}
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/* If we don't have an open file by now, then either the file does not
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already exist, or the base file has changed since it was created. In
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either case, if the user has specified use of a mapped file, then
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create a new mapped file, truncating any existing one. If we can't
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create one, print a system error message saying why we can't.
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By default the file is rw for everyone, with the user's umask taking
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care of turning off the permissions the user wants off. */
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if ((fd < 0) && mapped)
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{
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free (symsfilename);
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symsfilename = concat ("./", basename (filename), ".syms",
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(char *) NULL);
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if ((fd = open (symsfilename, O_RDWR | O_CREAT | O_TRUNC, 0666)) < 0)
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{
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if (error_pre_print)
|
|
{
|
|
printf (error_pre_print);
|
|
}
|
|
print_sys_errmsg (symsfilename, errno);
|
|
}
|
|
}
|
|
|
|
free (symsfilename);
|
|
return (fd);
|
|
}
|
|
|
|
/* Return the base address at which we would like the next objfile's
|
|
mapped data to start.
|
|
|
|
For now, we use the kludge that the configuration specifies a base
|
|
address to which it is safe to map the first mmalloc heap, and an
|
|
increment to add to this address for each successive heap. There are
|
|
a lot of issues to deal with here to make this work reasonably, including:
|
|
|
|
Avoid memory collisions with existing mapped address spaces
|
|
|
|
Reclaim address spaces when their mmalloc heaps are unmapped
|
|
|
|
When mmalloc heaps are shared between processes they have to be
|
|
mapped at the same addresses in each
|
|
|
|
Once created, a mmalloc heap that is to be mapped back in must be
|
|
mapped at the original address. I.E. each objfile will expect to
|
|
be remapped at it's original address. This becomes a problem if
|
|
the desired address is already in use.
|
|
|
|
etc, etc, etc.
|
|
|
|
*/
|
|
|
|
|
|
static CORE_ADDR
|
|
map_to_address ()
|
|
{
|
|
|
|
#if defined(MMAP_BASE_ADDRESS) && defined (MMAP_INCREMENT)
|
|
|
|
static CORE_ADDR next = MMAP_BASE_ADDRESS;
|
|
CORE_ADDR mapto = next;
|
|
|
|
next += MMAP_INCREMENT;
|
|
return (mapto);
|
|
|
|
#else
|
|
|
|
return (0);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
#endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
|