/* This file contains support routines for creating, manipulating, and
destroying objfile structures. */
-#include <stdio.h>
#include "defs.h"
#include "bfd.h" /* Binary File Description */
#include "symtab.h"
#include "symfile.h"
+#include "objfiles.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
#include <obstack.h>
-/* Externally visible variables that are owned by this module. */
+/* Prototypes for local functions */
+
+#if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
+
+static int
+open_existing_mapped_file PARAMS ((char *, long, int));
+
+static int
+open_mapped_file PARAMS ((char *filename, long mtime, int mapped));
+
+static CORE_ADDR
+map_to_address PARAMS ((void));
+
+#endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
+
+/* Message to be printed before the error message, when an error occurs. */
+
+extern char *error_pre_print;
+
+/* Externally visible variables that are owned by this module.
+ See declarations in objfile.h for more info. */
struct objfile *object_files; /* Linked list of all objfiles */
+struct objfile *current_objfile; /* For symbol file being read in */
+struct objfile *symfile_objfile; /* Main symbol table loaded from */
-/* Allocate a new objfile struct, fill it in as best we can, and return it.
- It is also linked into the list of all known object files. */
+int mapped_symbol_files; /* Try to use mapped symbol files */
+
+/* Given a pointer to an initialized bfd (ABFD) and a flag that indicates
+ whether or not an objfile is to be mapped (MAPPED), allocate a new objfile
+ struct, fill it in as best we can, link it into the list of all known
+ objfiles, and return a pointer to the new objfile struct. */
struct objfile *
-allocate_objfile (abfd, filename, dumpable)
+allocate_objfile (abfd, mapped)
bfd *abfd;
- char *filename;
- int dumpable;
+ int mapped;
{
- struct objfile *objfile;
+ struct objfile *objfile = NULL;
+ int fd;
+ void *md;
+ CORE_ADDR mapto;
+
+ mapped |= mapped_symbol_files;
+
+#if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
+
+ /* If we can support mapped symbol files, try to open/reopen the mapped file
+ that corresponds to the file from which we wish to read symbols. If the
+ objfile is to be mapped, we must malloc the structure itself using the
+ mmap version, and arrange that all memory allocation for the objfile uses
+ the mmap routines. If we are reusing an existing mapped file, from which
+ we get our objfile pointer, we have to make sure that we update the
+ pointers to the alloc/free functions in the obstack, in case these
+ functions have moved within the current gdb. */
+
+ fd = open_mapped_file (bfd_get_filename (abfd), bfd_get_mtime (abfd),
+ mapped);
+ if (fd >= 0)
+ {
+ if (((mapto = map_to_address ()) == 0) ||
+ ((md = mmalloc_attach (fd, (void *) mapto)) == NULL))
+ {
+ (void) close (fd);
+ }
+ else if ((objfile = (struct objfile *) mmalloc_getkey (md, 0)) != NULL)
+ {
+ /* Update memory corruption handler function addresses. */
+ init_malloc (md);
+ objfile -> md = md;
+ objfile -> mmfd = fd;
+ /* Update pointers to functions to *our* copies */
+ obstack_chunkfun (&objfile -> psymbol_obstack, xmmalloc);
+ obstack_freefun (&objfile -> psymbol_obstack, mfree);
+ obstack_chunkfun (&objfile -> symbol_obstack, xmmalloc);
+ obstack_freefun (&objfile -> symbol_obstack, mfree);
+ obstack_chunkfun (&objfile -> type_obstack, xmmalloc);
+ obstack_freefun (&objfile -> type_obstack, mfree);
+ /* If already in objfile list, unlink it. */
+ unlink_objfile (objfile);
+ /* Forget things specific to a particular gdb, may have changed. */
+ objfile -> sf = NULL;
+ }
+ else
+ {
+ /* Set up to detect internal memory corruption. MUST be done before
+ the first malloc. See comments in init_malloc() and mmcheck(). */
+ init_malloc (md);
+ objfile = (struct objfile *) xmmalloc (md, sizeof (struct objfile));
+ (void) memset (objfile, 0, sizeof (struct objfile));
+ objfile -> md = md;
+ objfile -> mmfd = fd;
+ objfile -> flags |= OBJF_MAPPED;
+ mmalloc_setkey (objfile -> md, 0, objfile);
+ obstack_full_begin (&objfile -> psymbol_obstack, 0, 0,
+ xmmalloc, mfree, objfile -> md,
+ OBSTACK_MMALLOC_LIKE);
+ obstack_full_begin (&objfile -> symbol_obstack, 0, 0,
+ xmmalloc, mfree, objfile -> md,
+ OBSTACK_MMALLOC_LIKE);
+ obstack_full_begin (&objfile -> type_obstack, 0, 0,
+ xmmalloc, mfree, objfile -> md,
+ OBSTACK_MMALLOC_LIKE);
+ }
+ }
+
+ if (mapped && (objfile == NULL))
+ {
+ warning ("symbol table for '%s' will not be mapped",
+ bfd_get_filename (abfd));
+ }
- /* First, if the objfile is to be dumpable, we must malloc the structure
- itself using the mmap version, and arrange that all memory allocation
- for the objfile uses the mmap routines. Otherwise, just use the
- old sbrk'd malloc routines. */
+#else /* defined(NO_MMALLOC) || !defined(HAVE_MMAP) */
- if (dumpable)
+ if (mapped)
{
- objfile = (struct objfile *) mmap_xmalloc (sizeof (struct objfile));
- (void) memset (objfile, 0, sizeof (struct objfile));
- objfile -> malloc = mmap_malloc;
- objfile -> realloc = mmap_realloc;
- objfile -> xmalloc = mmap_xmalloc;
- objfile -> xrealloc = mmap_xrealloc;
- objfile -> free = mmap_free;
- objfile -> flags |= OBJF_DUMPABLE;
+ warning ("this version of gdb does not support mapped symbol tables.");
+
+ /* Turn off the global flag so we don't try to do mapped symbol tables
+ any more, which shuts up gdb unless the user specifically gives the
+ "mapped" keyword again. */
+
+ mapped_symbol_files = 0;
}
- else
+
+#endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
+
+ /* If we don't support mapped symbol files, didn't ask for the file to be
+ mapped, or failed to open the mapped file for some reason, then revert
+ back to an unmapped objfile. */
+
+ if (objfile == NULL)
{
objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
(void) memset (objfile, 0, sizeof (struct objfile));
- objfile -> malloc = xmalloc;
- objfile -> realloc = xrealloc;
- objfile -> xmalloc = xmalloc;
- objfile -> xrealloc = xrealloc;
- objfile -> free = free;
- }
+ objfile -> md = NULL;
+ obstack_full_begin (&objfile -> psymbol_obstack, 0, 0, xmalloc, free,
+ (void *) 0, 0);
+ obstack_full_begin (&objfile -> symbol_obstack, 0, 0, xmalloc, free,
+ (void *) 0, 0);
+ obstack_full_begin (&objfile -> type_obstack, 0, 0, xmalloc, free,
+ (void *) 0, 0);
- /* Now, malloc a fresh copy of the filename string using the malloc
- specified as appropriate for the objfile. */
+ }
- objfile -> name = (*objfile -> xmalloc) (strlen (filename) + 1);
- strcpy (objfile -> name, filename);
+ /* Update the per-objfile information that comes from the bfd, ensuring
+ that any data that is reference is saved in the per-objfile data
+ region. */
objfile -> obfd = abfd;
-
+ if (objfile -> name != NULL)
+ {
+ mfree (objfile -> md, objfile -> name);
+ }
+ objfile -> name = mstrsave (objfile -> md, bfd_get_filename (abfd));
objfile -> mtime = bfd_get_mtime (abfd);
- /* Set up the various obstacks to use the memory allocation/free
- functions that are appropriate for this objfile. */
-
- obstack_full_begin (&objfile -> psymbol_obstack, 0, 0,
- objfile -> xmalloc, objfile -> free);
- obstack_full_begin (&objfile -> symbol_obstack, 0, 0,
- objfile -> xmalloc, objfile -> free);
- obstack_full_begin (&objfile -> type_obstack, 0, 0,
- objfile -> xmalloc, objfile -> free);
-
/* Push this file onto the head of the linked list of other such files. */
objfile -> next = object_files;
return (objfile);
}
+/* Unlink OBJFILE from the list of known objfiles, if it is found in the
+ list.
+
+ It is not a bug, or error, to call this function if OBJFILE is not known
+ to be in the current list. This is done in the case of mapped objfiles,
+ for example, just to ensure that the mapped objfile doesn't appear twice
+ in the list. Since the list is threaded, linking in a mapped objfile
+ twice would create a circular list.
+
+ If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
+ unlinking it, just to ensure that we have completely severed any linkages
+ between the OBJFILE and the list. */
+
+void
+unlink_objfile (objfile)
+ struct objfile *objfile;
+{
+ struct objfile** objpp;
+
+ for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp) -> next))
+ {
+ if (*objpp == objfile)
+ {
+ *objpp = (*objpp) -> next;
+ objfile -> next = NULL;
+ break;
+ }
+ }
+}
+
/* Destroy an objfile and all the symtabs and psymtabs under it. Note
that as much as possible is allocated on the symbol_obstack and
- psymbol_obstack, so that the memory can be efficiently freed. */
+ psymbol_obstack, so that the memory can be efficiently freed.
+
+ Things which we do NOT free because they are not in malloc'd memory
+ or not in memory specific to the objfile include:
+
+ objfile -> sf
+
+ FIXME: If the objfile is using reusable symbol information (via mmalloc),
+ then we need to take into account the fact that more than one process
+ may be using the symbol information at the same time (when mmalloc is
+ extended to support cooperative locking). When more than one process
+ is using the mapped symbol info, we need to be more careful about when
+ we free objects in the reusable area. */
void
free_objfile (objfile)
struct objfile *objfile;
{
struct objfile *ofp;
+ int mmfd;
+
+ /* First do any symbol file specific actions required when we are
+ finished with a particular symbol file. Note that if the objfile
+ is using reusable symbol information (via mmalloc) then each of
+ these routines is responsible for doing the correct thing, either
+ freeing things which are valid only during this particular gdb
+ execution, or leaving them to be reused during the next one. */
- if (objfile -> name)
+ if (objfile -> sf != NULL)
{
- (*objfile -> free) (objfile -> name);
- }
- if (objfile -> obfd)
- {
- bfd_close (objfile -> obfd);
+ (*objfile -> sf -> sym_finish) (objfile);
}
- /* Remove it from the chain of all objfiles. */
+ /* We always close the bfd. */
- if (object_files == objfile)
- {
- object_files = objfile -> next;
- }
- else
+ if (objfile -> obfd != NULL)
{
- for (ofp = object_files; ofp; ofp = ofp -> next)
- {
- if (ofp -> next == objfile)
- {
- ofp -> next = objfile -> next;
- }
- }
+ char *name = bfd_get_filename (objfile->obfd);
+ bfd_close (objfile -> obfd);
+ free (name);
}
- obstack_free (&objfile -> psymbol_obstack, 0);
- obstack_free (&objfile -> symbol_obstack, 0);
- obstack_free (&objfile -> type_obstack, 0);
+ /* Remove it from the chain of all objfiles. */
-#if 0 /* FIXME!! */
+ unlink_objfile (objfile);
/* Before the symbol table code was redone to make it easier to
selectively load and remove information particular to a specific
#endif
clear_pc_function_cache ();
-#endif
+ /* The last thing we do is free the objfile struct itself for the
+ non-reusable case, or detach from the mapped file for the reusable
+ case. Note that the mmalloc_detach or the mfree is the last thing
+ we can do with this objfile. */
+
+#if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
+
+ if (objfile -> flags & OBJF_MAPPED)
+ {
+ /* Remember the fd so we can close it. We can't close it before
+ doing the detach, and after the detach the objfile is gone. */
+ mmfd = objfile -> mmfd;
+ mmalloc_detach (objfile -> md);
+ objfile = NULL;
+ (void) close (mmfd);
+ }
- /* The last thing we do is free the objfile struct itself, using the
- free() that is appropriate for the objfile. */
+#endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
- (*objfile -> free) (objfile);
+ /* If we still have an objfile, then either we don't support reusable
+ objfiles or this one was not reusable. So free it normally. */
+
+ if (objfile != NULL)
+ {
+ if (objfile -> name != NULL)
+ {
+ mfree (objfile -> md, objfile -> name);
+ }
+ if (objfile->global_psymbols.list)
+ mfree (objfile->md, objfile->global_psymbols.list);
+ if (objfile->static_psymbols.list)
+ mfree (objfile->md, objfile->static_psymbols.list);
+ /* Free the obstacks for non-reusable objfiles */
+ obstack_free (&objfile -> psymbol_obstack, 0);
+ obstack_free (&objfile -> symbol_obstack, 0);
+ obstack_free (&objfile -> type_obstack, 0);
+ mfree (objfile -> md, objfile);
+ objfile = NULL;
+ }
}
have_partial_symbols ()
{
struct objfile *ofp;
- int havethem = 0;
- for (ofp = object_files; ofp; ofp = ofp -> next)
+ ALL_OBJFILES (ofp)
{
if (ofp -> psymtabs != NULL)
{
- havethem++;
- break;
+ return 1;
}
}
- return (havethem);
+ return 0;
}
/* Many places in gdb want to test just to see if we have any full
have_full_symbols ()
{
struct objfile *ofp;
- int havethem = 0;
- for (ofp = object_files; ofp; ofp = ofp -> next)
+ ALL_OBJFILES (ofp)
{
if (ofp -> symtabs != NULL)
{
- havethem++;
- break;
+ return 1;
}
}
- return (havethem);
+ return 0;
}
/* Many places in gdb want to test just to see if we have any minimal
have_minimal_symbols ()
{
struct objfile *ofp;
- int havethem = 0;
- for (ofp = object_files; ofp; ofp = ofp -> next)
+ ALL_OBJFILES (ofp)
{
if (ofp -> msymbols != NULL)
{
- havethem++;
- break;
+ return 1;
}
}
- return (havethem);
+ return 0;
}
-/* Call the function specified by FUNC for each currently available objfile,
- for as long as this function continues to return NULL. If the function
- ever returns non-NULL, then the iteration over the objfiles is terminated,
- and the result is returned to the caller. The function called has full
- control over the form and content of the information returned via the
- non-NULL result, which may be as simple as a pointer to the objfile that
- the iteration terminated on, or as complex as a pointer to a private
- structure containing multiple results. */
-
-PTR
-iterate_over_objfiles (func, arg1, arg2, arg3)
- PTR (*func) PARAMS ((struct objfile *, PTR, PTR, PTR));
- PTR arg1;
- PTR arg2;
- PTR arg3;
-{
- register struct objfile *objfile;
- PTR result = NULL;
+#if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
- for (objfile = object_files;
- objfile != NULL && result == NULL;
- objfile = objfile -> next)
- {
- result = (*func)(objfile, arg1, arg2, arg3);
- }
- return (result);
-}
+/* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
+ of the corresponding symbol file in MTIME, try to open an existing file
+ with the name SYMSFILENAME and verify it is more recent than the base
+ file by checking it's timestamp against MTIME.
+
+ If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
-/* Call the function specified by FUNC for each currently available symbol
- table, for as long as this function continues to return NULL. If the
- function ever returns non-NULL, then the iteration over the symbol tables
- is terminated, and the result is returned to the caller. The function
- called has full control over the form and content of the information
- returned via the non-NULL result, which may be as simple as a pointer
- to the symtab that the iteration terminated on, or as complex as a
- pointer to a private structure containing multiple results. */
-
-PTR
-iterate_over_symtabs (func, arg1, arg2, arg3)
- PTR (*func) PARAMS ((struct objfile *, struct symtab *, PTR, PTR, PTR));
- PTR arg1;
- PTR arg2;
- PTR arg3;
+ If SYMSFILENAME does exist, but is out of date, we check to see if the
+ user has specified creation of a mapped file. If so, we don't issue
+ any warning message because we will be creating a new mapped file anyway,
+ overwriting the old one. If not, then we issue a warning message so that
+ the user will know why we aren't using this existing mapped symbol file.
+ In either case, we return -1.
+
+ If SYMSFILENAME does exist and is not out of date, but can't be opened for
+ some reason, then prints an appropriate system error message and returns -1.
+
+ Otherwise, returns the open file descriptor. */
+
+static int
+open_existing_mapped_file (symsfilename, mtime, mapped)
+ char *symsfilename;
+ long mtime;
+ int mapped;
{
- register struct objfile *objfile;
- register struct symtab *symtab;
- PTR result = NULL;
+ int fd = -1;
+ struct stat sbuf;
- for (objfile = object_files;
- objfile != NULL && result == NULL;
- objfile = objfile -> next)
+ if (stat (symsfilename, &sbuf) == 0)
{
- for (symtab = objfile -> symtabs;
- symtab != NULL && result == NULL;
- symtab = symtab -> next)
+ if (sbuf.st_mtime < mtime)
{
- result = (*func)(objfile, symtab, arg1, arg2, arg3);
+ if (!mapped)
+ {
+ warning ("mapped symbol file `%s' is out of date", symsfilename);
+ }
+ }
+ else if ((fd = open (symsfilename, O_RDWR)) < 0)
+ {
+ if (error_pre_print)
+ {
+ printf (error_pre_print);
+ }
+ print_sys_errmsg (symsfilename, errno);
}
}
- return (result);
+ return (fd);
}
-/* Call the function specified by FUNC for each currently available partial
- symbol table, for as long as this function continues to return NULL. If
- the function ever returns non-NULL, then the iteration over the partial
- symbol tables is terminated, and the result is returned to the caller.
-
- The function called has full control over the form and content of the
- information returned via the non-NULL result, which may be as simple as a
- pointer to the partial symbol table that the iteration terminated on, or
- as complex as a pointer to a private structure containing multiple
- results. */
-
-PTR
-iterate_over_psymtabs (func, arg1, arg2, arg3)
- PTR (*func) PARAMS ((struct objfile *, struct partial_symtab *,
- PTR, PTR, PTR));
- PTR arg1;
- PTR arg2;
- PTR arg3;
+/* Look for a mapped symbol file that corresponds to FILENAME and is more
+ recent than MTIME. If MAPPED is nonzero, the user has asked that gdb
+ use a mapped symbol file for this file, so create a new one if one does
+ not currently exist.
+
+ If found, then return an open file descriptor for the file, otherwise
+ return -1.
+
+ This routine is responsible for implementing the policy that generates
+ the name of the mapped symbol file from the name of a file containing
+ symbols that gdb would like to read. Currently this policy is to append
+ ".syms" to the name of the file.
+
+ This routine is also responsible for implementing the policy that
+ determines where the mapped symbol file is found (the search path).
+ This policy is that when reading an existing mapped file, a file of
+ the correct name in the current directory takes precedence over a
+ file of the correct name in the same directory as the symbol file.
+ When creating a new mapped file, it is always created in the current
+ directory. This helps to minimize the chances of a user unknowingly
+ creating big mapped files in places like /bin and /usr/local/bin, and
+ allows a local copy to override a manually installed global copy (in
+ /bin for example). */
+
+static int
+open_mapped_file (filename, mtime, mapped)
+ char *filename;
+ long mtime;
+ int mapped;
{
- register struct objfile *objfile;
- register struct partial_symtab *psymtab;
- PTR result = NULL;
+ int fd;
+ char *symsfilename;
+
+ /* First try to open an existing file in the current directory, and
+ then try the directory where the symbol file is located. */
- for (objfile = object_files;
- objfile != NULL && result == NULL;
- objfile = objfile -> next)
+ symsfilename = concat ("./", basename (filename), ".syms", (char *) NULL);
+ if ((fd = open_existing_mapped_file (symsfilename, mtime, mapped)) < 0)
{
- for (psymtab = objfile -> psymtabs;
- psymtab != NULL && result == NULL;
- psymtab = psymtab -> next)
+ free (symsfilename);
+ symsfilename = concat (filename, ".syms", (char *) NULL);
+ fd = open_existing_mapped_file (symsfilename, mtime, mapped);
+ }
+
+ /* If we don't have an open file by now, then either the file does not
+ already exist, or the base file has changed since it was created. In
+ either case, if the user has specified use of a mapped file, then
+ create a new mapped file, truncating any existing one. If we can't
+ create one, print a system error message saying why we can't.
+
+ By default the file is rw for everyone, with the user's umask taking
+ care of turning off the permissions the user wants off. */
+
+ if ((fd < 0) && mapped)
+ {
+ free (symsfilename);
+ symsfilename = concat ("./", basename (filename), ".syms",
+ (char *) NULL);
+ if ((fd = open (symsfilename, O_RDWR | O_CREAT | O_TRUNC, 0666)) < 0)
{
- result = (*func)(objfile, psymtab, arg1, arg2, arg3);
+ if (error_pre_print)
+ {
+ printf (error_pre_print);
+ }
+ print_sys_errmsg (symsfilename, errno);
}
}
- return (result);
+
+ 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) */
+
projects / deliverable / binutils-gdb.git / blobdiff