(file c-string)
(initial-fun (unsigned #.sb!vm:n-word-bits)))
-;;; FIXME: When this is run without the PURIFY option,
-;;; it seems to save memory all the way up to the high-water mark,
-;;; not just what's currently used; and then after loading the
-;;; image to make a running Lisp, the memory never gets reclaimed.
-;;; (But with the PURIFY option it seems to work OK.)
+#!+gencgc
+(define-alien-routine "gc_and_save" void
+ (file c-string))
+
+#!+gencgc
+(defvar sb!vm::*restart-lisp-function*)
+
(defun save-lisp-and-die (core-file-name &key
- (toplevel #'toplevel-init)
- (purify t)
- (root-structures ())
- (environment-name "auxiliary"))
+ (toplevel #'toplevel-init)
+ (purify #!+gencgc nil
+ #!-gencgc t)
+ (root-structures ())
+ (environment-name "auxiliary"))
#!+sb-doc
"Save a \"core image\", i.e. enough information to restart a Lisp
process later in the same state, in the file of the specified name.
-
-This implementation is not as polished and painless as you might
-like:
- * It corrupts the current Lisp image enough that the current process
- needs to be killed afterwards. This can be worked around by forking
- another process that saves the core.
- * It will not work if multiple threads are in use.
- * There is absolutely no binary compatibility of core images between
- different runtime support programs. Even runtimes built from the same
- sources at different times are treated as incompatible for this
- purpose.
-This isn't because we like it this way, but just because there don't
-seem to be good quick fixes for either limitation and no one has been
-sufficiently motivated to do lengthy fixes.
+Only global state is preserved: the stack is unwound in the process.
The following &KEY arguments are defined:
+
:TOPLEVEL
The function to run when the created core file is resumed. The
default function handles command line toplevel option processing
and runs the top level read-eval-print loop. This function should
not return.
+
:PURIFY
- If true (the default), do a purifying GC which moves all
+ If true (the default on cheneygc), do a purifying GC which moves all
dynamically allocated objects into static space. This takes
somewhat longer than the normal GC which is otherwise done, but
it's only done once, and subsequent GC's will be done less often
and will take less time in the resulting core file. See the PURIFY
- function.
+ function. For platforms that use the generational garbage collector
+ (x86 and x86-64) purification generally results in a loss of
+ performance.
+
:ROOT-STRUCTURES
This should be a list of the main entry points in any newly loaded
systems. This need not be supplied, but locality and/or GC performance
may be better if they are. Meaningless if :PURIFY is NIL. See the
PURIFY function.
+
:ENVIRONMENT-NAME
This is also passed to the PURIFY function when :PURIFY is T.
(rarely used)
The save/load process changes the values of some global variables:
+
*STANDARD-OUTPUT*, *DEBUG-IO*, etc.
Everything related to open streams is necessarily changed, since
the OS won't let us preserve a stream across save and load.
+
*DEFAULT-PATHNAME-DEFAULTS*
This is reinitialized to reflect the working directory where the
- saved core is loaded."
+ saved core is loaded.
+
+Foreign objects loaded with SB-ALIEN:LOAD-SHARED-OBJECT are
+automatically reloaded on startup, but references to foreign symbols
+do not survive intact on all platforms: in this case a WARNING is
+signalled when saving the core. If no warning is signalled, then the
+foreign symbol references will remain intact. Platforms where this is
+currently the case are x86/FreeBSD, x86/Linux, x86/NetBSD,
+sparc/Linux, sparc/SunOS, and ppc/Darwin.
+
+This implementation is not as polished and painless as you might like:
+ * It corrupts the current Lisp image enough that the current process
+ needs to be killed afterwards. This can be worked around by forking
+ another process that saves the core.
+ * It will not work if multiple threads are in use.
+ * There is absolutely no binary compatibility of core images between
+ different runtime support programs. Even runtimes built from the same
+ sources at different times are treated as incompatible for this
+ purpose.
+This isn't because we like it this way, but just because there don't
+seem to be good quick fixes for either limitation and no one has been
+sufficiently motivated to do lengthy fixes."
(deinit)
;; FIXME: Would it be possible to unmix the PURIFY logic from this
;; function, and just do a GC :FULL T here? (Then if the user wanted
;; a PURIFYed image, he'd just run PURIFY immediately before calling
;; SAVE-LISP-AND-DIE.)
- (if purify
- (purify :root-structures root-structures
- :environment-name environment-name)
- #-gencgc (gc) #+gencgc (gc :full t))
- (flet ((restart-lisp ()
- (handling-end-of-the-world
- (reinit)
- (funcall toplevel))))
- ;; FIXME: Perhaps WITHOUT-GCING should be wrapped around the
- ;; LET as well, to avoid the off chance of an interrupt triggering
- ;; GC and making our saved RESTART-LISP address invalid?
- (without-gcing
- (save (unix-namestring core-file-name nil)
- (get-lisp-obj-address #'restart-lisp)))))
+ (labels ((restart-lisp ()
+ (handling-end-of-the-world
+ (reinit)
+ (funcall toplevel)))
+ (save-core (gc)
+ (when gc
+ #!-gencgc (gc)
+ ;; Do a destructive non-conservative GC, and then save a core.
+ ;; A normal GC will leave huge amounts of storage unreclaimed
+ ;; (over 50% on x86). This needs to be done by a single function
+ ;; since the GC will invalidate the stack.
+ #!+gencgc (gc-and-save (unix-namestring core-file-name nil)))
+ (without-gcing
+ (save (unix-namestring core-file-name nil)
+ (get-lisp-obj-address #'restart-lisp)))))
+ ;; Save the restart function into a static symbol, to allow GC-AND-SAVE
+ ;; access to it even after the GC has moved it.
+ #!+gencgc
+ (setf sb!vm::*restart-lisp-function* #'restart-lisp)
+ (cond (purify
+ (purify :root-structures root-structures
+ :environment-name environment-name)
+ (save-core nil))
+ (t
+ ;; Compact the environment even though we're skipping the
+ ;; other purification stages.
+ (sb!kernel::compact-environment-aux "Auxiliary" 200)
+ (save-core t)))))
(defun deinit ()
- (mapc #'funcall *save-hooks*)
- (when (fboundp 'cancel-finalization)
+ (dolist (hook *save-hooks*)
+ (with-simple-restart (continue "Skip this save hook.")
+ (funcall hook)))
+ (when (fboundp 'cancel-finalization)
(cancel-finalization sb!sys:*tty*))
(profile-deinit)
(debug-deinit)
projects / sbcl.git / blobdiff