1 ;;;; that part of the loader is only needed on the target system
2 ;;;; (which is basically synonymous with "that part of the loader
3 ;;;; which is not needed by GENESIS")
5 ;;;; This software is part of the SBCL system. See the README file for
8 ;;;; This software is derived from the CMU CL system, which was
9 ;;;; written at Carnegie Mellon University and released into the
10 ;;;; public domain. The software is in the public domain and is
11 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
12 ;;;; files for more information.
14 (in-package "SB!FASL")
16 (defvar *load-source-default-type* "lisp"
18 "The source file types which LOAD looks for by default.")
20 (declaim (type (or pathname null) *load-truename* *load-pathname*))
21 (defvar *load-truename* nil
23 "the TRUENAME of the file that LOAD is currently loading")
24 (defvar *load-pathname* nil
26 "the defaulted pathname that LOAD is currently loading")
30 ;;; Load a text stream. (Note that load-as-fasl is in another file.)
31 (defun load-as-source (stream verbose print)
32 (maybe-announce-load stream verbose)
34 ((do-sexprs (((sexpr index) stream) &body body)
35 (aver (symbolp sexpr))
36 (with-unique-names (source-info)
37 (once-only ((stream stream))
38 `(if (handler-case (pathname stream)
40 (let* ((,source-info (sb!c::make-file-source-info
42 (stream-external-format ,stream)))
43 (sb!c::*source-info* ,source-info)
44 (sb!c::*source-paths* (make-hash-table :test 'eq)))
45 (setf (sb!c::source-info-stream ,source-info) ,stream)
46 (sb!c::do-forms-from-info ((,sexpr current-index)
48 (sb!c::find-source-paths ,sexpr current-index)
49 (let ((,index current-index))
51 (let ((sb!c::*source-info* nil)
53 (do ((,sexpr (read ,stream nil *eof-object*)
54 (read ,stream nil *eof-object*)))
55 ((eq ,sexpr *eof-object*))
57 (do-sexprs ((sexpr tlf-index) stream)
59 (let ((results (multiple-value-list (eval-tlf sexpr tlf-index))))
61 (format t "~{~S~^, ~}~%" results))
62 (eval-tlf sexpr tlf-index)))
67 (define-condition fasl-header-missing (invalid-fasl)
68 ((fhsss :reader invalid-fasl-fhsss :initarg :fhsss))
70 (lambda (condition stream)
71 (format stream "~@<File ~S has a fasl file type, but no fasl header:~%~
72 Expected ~S, but got ~S.~:@>"
73 (invalid-fasl-stream condition)
74 (invalid-fasl-expected condition)
75 (invalid-fasl-fhsss condition)))))
78 ;;; The following comment preceded the pre 1.0.12.36 definition of
79 ;;; LOAD; it may no longer be accurate:
81 ;; FIXME: Daniel Barlow's ilsb.tar ILISP-for-SBCL patches contain an
82 ;; implementation of "DEFUN SOURCE-FILE" which claims, in a comment,
83 ;; that CMU CL does not correctly record source file information when
84 ;; LOADing a non-compiled file. Check whether this bug exists in SBCL
87 (defun load (pathspec &key (verbose *load-verbose*) (print *load-print*)
88 (if-does-not-exist t) (external-format :default))
90 "Load the file given by FILESPEC into the Lisp environment, returning
92 (flet ((load-stream (stream faslp)
93 (let* (;; Bindings required by ANSI.
94 (*readtable* *readtable*)
95 (*package* (sane-package))
96 ;; FIXME: we should probably document the circumstances
97 ;; where *LOAD-PATHNAME* and *LOAD-TRUENAME* aren't
98 ;; pathnames during LOAD. ANSI makes no exceptions here.
99 (*load-pathname* (handler-case (pathname stream)
100 ;; FIXME: it should probably be a type
101 ;; error to try to get a pathname for a
102 ;; stream that doesn't have one, but I
103 ;; don't know if we guarantee that.
105 (*load-truename* (when *load-pathname*
106 (handler-case (truename stream)
107 (file-error () nil))))
108 ;; Bindings used internally.
109 (*load-depth* (1+ *load-depth*))
110 ;; KLUDGE: I can't find in the ANSI spec where it says
111 ;; that DECLAIM/PROCLAIM of optimization policy should
112 ;; have file scope. CMU CL did this, and it seems
113 ;; reasonable, but it might not be right; after all,
114 ;; things like (PROCLAIM '(TYPE ..)) don't have file
115 ;; scope, and I can't find anything under PROCLAIM or
116 ;; COMPILE-FILE or LOAD or OPTIMIZE which justifies this
117 ;; behavior. Hmm. -- WHN 2001-04-06
118 (sb!c::*policy* sb!c::*policy*))
121 (load-as-fasl stream verbose print)
122 (load-as-source stream verbose print))))))
124 (when (streamp pathspec)
125 (return-from load (load-stream pathspec (fasl-header-p pathspec))))
126 (let ((pathname (pathname pathspec)))
127 ;; Case 2: Open as binary, try to process as a fasl.
129 (stream (or (open pathspec :element-type '(unsigned-byte 8)
130 :if-does-not-exist nil)
131 (when (null (pathname-type pathspec))
132 (let ((defaulted-pathname
133 (probe-load-defaults pathspec)))
134 (if defaulted-pathname
135 (progn (setq pathname defaulted-pathname)
138 (if if-does-not-exist :error nil)
139 :element-type '(unsigned-byte 8))))))
140 (if if-does-not-exist
141 (error 'simple-file-error
144 "~@<Couldn't load ~S: file does not exist.~@:>"
145 :format-arguments (list pathspec)))))
147 (return-from load nil))
148 (let* ((real (probe-file stream))
150 (and real (string-equal (pathname-type real) *fasl-file-type*))))
151 ;; Don't allow empty .fasls, and assume other empty files
153 (when (and (or should-be-fasl-p (not (eql 0 (file-length stream))))
154 (fasl-header-p stream :errorp should-be-fasl-p))
155 (return-from load (load-stream stream t)))))
156 ;; Case 3: Open using the gived external format, process as source.
157 (with-open-file (stream pathname :external-format external-format)
158 (load-stream stream nil)))))
160 ;; This implements the defaulting SBCL seems to have inherited from
161 ;; CMU. This routine does not try to perform any loading; all it does
162 ;; is return the pathname (not the truename) of a file to be loaded,
163 ;; or NIL if no such file can be found. This routine is supposed to
164 ;; signal an error if a fasl's timestamp is older than its source
165 ;; file, but we protect against errors in PROBE-FILE, because any of
166 ;; the ways that we might fail to find a defaulted file are reasons
167 ;; not to load it, but not worth exposing to the user who didn't
168 ;; expicitly ask us to load a file with a made-up name (e.g., the
169 ;; defaulted filename might exceed filename length limits).
170 (defun probe-load-defaults (pathname)
171 (destructuring-bind (defaulted-source-pathname
172 defaulted-source-truename
173 defaulted-fasl-pathname
174 defaulted-fasl-truename)
175 (loop for type in (list *load-source-default-type*
177 as probe-pathname = (make-pathname :type type
179 collect probe-pathname
180 collect (handler-case (probe-file probe-pathname)
181 (file-error () nil)))
182 (cond ((and defaulted-fasl-truename
183 defaulted-source-truename
184 (> (file-write-date defaulted-source-truename)
185 (file-write-date defaulted-fasl-truename)))
187 (error "The object file ~A is~@
188 older than the presumed source:~% ~A."
189 defaulted-fasl-truename
190 defaulted-source-truename)
191 (source () :report "load source file"
192 defaulted-source-pathname)
193 (object () :report "load object file"
194 defaulted-fasl-pathname)))
195 (defaulted-fasl-truename defaulted-fasl-pathname)
196 (defaulted-source-truename defaulted-source-pathname))))
198 ;;; Load a code object. BOX-NUM objects are popped off the stack for
199 ;;; the boxed storage section, then SIZE bytes of code are read in.
201 (defun load-code (box-num code-length)
202 (declare (fixnum box-num code-length))
204 (let ((code (sb!c:allocate-code-object box-num code-length))
205 (index (+ sb!vm:code-trace-table-offset-slot box-num)))
206 (declare (type index index))
207 (setf (%code-debug-info code) (pop-stack))
210 (setf (code-header-ref code (decf index)) (pop-stack)))
211 (sb!sys:without-gcing
212 (read-n-bytes *fasl-input-stream*
213 (code-instructions code)
218 ;;; Moving native code during a GC or purify is not so trivial on the
221 ;;; Our strategy for allowing the loading of x86 native code into the
222 ;;; dynamic heap requires that the addresses of fixups be saved for
223 ;;; all these code objects. After a purify these fixups can be
224 ;;; dropped. In CMU CL, this policy was enabled with
225 ;;; *ENABLE-DYNAMIC-SPACE-CODE*; in SBCL it's always used.
227 (defun load-code (box-num code-length)
228 (declare (fixnum box-num code-length))
230 (let ((stuff (list (pop-stack))))
233 (push (pop-stack) stuff))
234 (let* ((dbi (car (last stuff))) ; debug-info
235 (tto (first stuff))) ; trace-table-offset
237 (setq stuff (nreverse stuff))
239 ;; FIXME: *LOAD-CODE-VERBOSE* should probably be #!+SB-SHOW.
240 (when *load-code-verbose*
241 (format t "stuff: ~S~%" stuff)
244 (sb!c::compiled-debug-info-p dbi)
245 (sb!c::debug-info-p dbi)
246 (sb!c::compiled-debug-info-name dbi)
248 (format t " loading to the dynamic space~%"))
250 (let ((code (sb!c:allocate-code-object box-num code-length))
251 (index (+ sb!vm:code-trace-table-offset-slot box-num)))
252 (declare (type index index))
253 (when *load-code-verbose*
256 (sb!kernel::get-lisp-obj-address code)))
257 (setf (%code-debug-info code) (pop stuff))
260 (setf (code-header-ref code (decf index)) (pop stuff)))
261 (sb!sys:without-gcing
262 (read-n-bytes *fasl-input-stream*
263 (code-instructions code)
270 ;;; how we learn about assembler routines at startup
271 (defvar *!initial-assembler-routines*)
273 (defun !loader-cold-init ()
274 (/show0 "/!loader-cold-init")
275 (dolist (routine *!initial-assembler-routines*)
276 (setf (gethash (car routine) *assembler-routines*) (cdr routine))))