1 ;;;; Dump the current Lisp image into a core file. Also contains
2 ;;;; various high-level initialization stuff: loading init files and
3 ;;;; parsing environment variables.
5 ;;;; (All the real work is done by C.)
7 ;;;; This software is part of the SBCL system. See the README file for
10 ;;;; This software is derived from the CMU CL system, which was
11 ;;;; written at Carnegie Mellon University and released into the
12 ;;;; public domain. The software is in the public domain and is
13 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
14 ;;;; files for more information.
16 (in-package "SB!IMPL")
18 ;;;; SAVE-LISP-AND-DIE itself
20 (define-alien-routine "save" (boolean)
22 (initial-fun (unsigned #.sb!vm:n-word-bits)))
25 (define-alien-routine "gc_and_save" void
29 (defvar sb!vm::*restart-lisp-function*)
31 (defun save-lisp-and-die (core-file-name &key
32 (toplevel #'toplevel-init)
35 (environment-name "auxiliary"))
37 "Save a \"core image\", i.e. enough information to restart a Lisp
38 process later in the same state, in the file of the specified name.
39 Only global state is preserved: the stack is unwound in the process.
41 The following &KEY arguments are defined:
44 The function to run when the created core file is resumed. The
45 default function handles command line toplevel option processing
46 and runs the top level read-eval-print loop. This function should
50 If true (the default), do a purifying GC which moves all
51 dynamically allocated objects into static space. This takes
52 somewhat longer than the normal GC which is otherwise done, but
53 it's only done once, and subsequent GC's will be done less often
54 and will take less time in the resulting core file. See the PURIFY
58 This should be a list of the main entry points in any newly loaded
59 systems. This need not be supplied, but locality and/or GC performance
60 may be better if they are. Meaningless if :PURIFY is NIL. See the
64 This is also passed to the PURIFY function when :PURIFY is T.
67 The save/load process changes the values of some global variables:
69 *STANDARD-OUTPUT*, *DEBUG-IO*, etc.
70 Everything related to open streams is necessarily changed, since
71 the OS won't let us preserve a stream across save and load.
73 *DEFAULT-PATHNAME-DEFAULTS*
74 This is reinitialized to reflect the working directory where the
77 Foreign objects loaded with SB-ALIEN:LOAD-SHARED-OBJECT are
78 automatically reloaded on startup, but references to foreign symbols
79 do not survive intact on all platforms: in this case a WARNING is
80 signalled when saving the core. If no warning is signalled, then the
81 foreign symbol references will remain intact. Platforms where this is
82 currently the case are x86/FreeBSD, x86/Linux, x86/NetBSD,
83 sparc/Linux, sparc/SunOS, and ppc/Darwin.
85 This implementation is not as polished and painless as you might like:
86 * It corrupts the current Lisp image enough that the current process
87 needs to be killed afterwards. This can be worked around by forking
88 another process that saves the core.
89 * It will not work if multiple threads are in use.
90 * There is absolutely no binary compatibility of core images between
91 different runtime support programs. Even runtimes built from the same
92 sources at different times are treated as incompatible for this
94 This isn't because we like it this way, but just because there don't
95 seem to be good quick fixes for either limitation and no one has been
96 sufficiently motivated to do lengthy fixes."
98 ;; FIXME: Would it be possible to unmix the PURIFY logic from this
99 ;; function, and just do a GC :FULL T here? (Then if the user wanted
100 ;; a PURIFYed image, he'd just run PURIFY immediately before calling
101 ;; SAVE-LISP-AND-DIE.)
102 (labels ((restart-lisp ()
103 (handling-end-of-the-world
109 ;; Do a destructive non-conservative GC, and then save a core.
110 ;; A normal GC will leave huge amounts of storage unreclaimed
111 ;; (over 50% on x86). This needs to be done by a single function
112 ;; since the GC will invalidate the stack.
113 #!+gencgc (gc-and-save (unix-namestring core-file-name nil)))
115 (save (unix-namestring core-file-name nil)
116 (get-lisp-obj-address #'restart-lisp)))))
117 ;; Save the restart function into a static symbol, to allow GC-AND-SAVE
118 ;; access to it even after the GC has moved it.
119 (setf sb!vm::*restart-lisp-function* #'restart-lisp)
121 (purify :root-structures root-structures
122 :environment-name environment-name)
128 (dolist (hook *save-hooks*)
129 (with-simple-restart (continue "Skip this save hook.")
131 (when (fboundp 'cancel-finalization)
132 (cancel-finalization sb!sys:*tty*))