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")
31 (defun load-as-source (stream verbose print)
32 (maybe-announce-load stream verbose)
33 (do ((sexpr (read stream nil *eof-object*)
34 (read stream nil *eof-object*)))
35 ((eq sexpr *eof-object*)
38 (let ((results (multiple-value-list (eval sexpr))))
40 (format t "~{~S~^, ~}~%" results))
45 (define-condition fasl-header-missing (invalid-fasl)
46 ((fhsss :reader invalid-fasl-fhsss :initarg :fhsss))
48 (lambda (condition stream)
49 (format stream "~@<File ~S has a fasl file type, but no fasl header:~%~
50 Expected ~S, but got ~S.~:@>"
51 (invalid-fasl-stream condition)
52 (invalid-fasl-expected condition)
53 (invalid-fasl-fhsss condition)))))
55 ;;; a helper function for LOAD: Load the stuff in a file when we have
57 (defun internal-load (pathname truename if-does-not-exist verbose print
59 (declare (type (member nil :error) if-does-not-exist))
62 (error 'simple-file-error
64 :format-control "~S does not exist."
65 :format-arguments (list (namestring pathname)))
66 (return-from internal-load nil)))
68 (let ((*load-truename* truename)
69 (*load-pathname* pathname))
72 (with-open-file (stream truename
74 :if-does-not-exist if-does-not-exist)
75 (load-as-source stream verbose print)))
77 (with-open-file (stream truename
79 :if-does-not-exist if-does-not-exist
80 :element-type '(unsigned-byte 8))
81 (load-as-fasl stream verbose print)))
83 (let ((first-line (with-open-file (stream truename :direction :input)
84 (read-line stream nil)))
85 (fhsss *fasl-header-string-start-string*))
88 (>= (length (the simple-string first-line))
90 (string= first-line fhsss :end1 (length fhsss)))
91 (internal-load pathname truename if-does-not-exist verbose print
94 (when (string= (pathname-type truename) *fasl-file-type*)
95 (error 'fasl-header-missing
96 :stream (namestring truename)
99 (internal-load pathname truename if-does-not-exist verbose print
102 ;;; a helper function for INTERNAL-LOAD-DEFAULT-TYPE: Try the default
103 ;;; file type TYPE and return (VALUES PATHNAME TRUENAME) for a match,
104 ;;; or (VALUES PATHNAME NIL) if the file doesn't exist.
106 ;;; This is analogous to CMU CL's TRY-DEFAULT-TYPES, but we only try a
107 ;;; single type. By avoiding CMU CL's generality here, we avoid having
108 ;;; to worry about some annoying ambiguities. (E.g. what if the
109 ;;; possible types are ".lisp" and ".cl", and both "foo.lisp" and
111 (defun try-default-type (pathname type)
112 (let ((pn (translate-logical-pathname (make-pathname :type type :defaults pathname))))
113 (values pn (probe-file pn))))
115 ;;; a helper function for LOAD: Handle the case of INTERNAL-LOAD where
116 ;;; the file does not exist.
117 (defun internal-load-default-type (pathname if-does-not-exist verbose print)
118 (declare (type (member nil :error) if-does-not-exist))
119 (multiple-value-bind (src-pn src-tn)
120 (try-default-type pathname *load-source-default-type*)
121 (multiple-value-bind (obj-pn obj-tn)
122 (try-default-type pathname *fasl-file-type*)
126 (> (file-write-date src-tn) (file-write-date obj-tn)))
128 (error "The object file ~A is~@
129 older than the presumed source:~% ~A."
132 ;; FIXME: In CMU CL one of these was a CONTINUE case.
133 ;; There's not one now. I don't remember how restart-case
134 ;; works very well, make sure that it doesn't do anything
135 ;; weird when we don't specify the CONTINUE case.
136 (source () :report "load source file"
137 (internal-load src-pn src-tn if-does-not-exist verbose print
139 (object () :report "load object file"
140 (internal-load src-pn obj-tn if-does-not-exist verbose print
143 (internal-load obj-pn obj-tn if-does-not-exist verbose print :binary))
145 (internal-load src-pn src-tn if-does-not-exist verbose print :source))
147 (internal-load pathname nil if-does-not-exist verbose print nil))))))
149 ;;; This function mainly sets up special bindings and then calls
150 ;;; sub-functions. We conditionally bind the switches with PROGV so
151 ;;; that people can set them in their init files and have the values
152 ;;; take effect. If the compiler is loaded, we make the
153 ;;; compiler-policy local to LOAD by binding it to itself.
155 ;;; FIXME: Daniel Barlow's ilsb.tar ILISP-for-SBCL patches contain an
156 ;;; implementation of "DEFUN SOURCE-FILE" which claims, in a comment, that CMU
157 ;;; CL does not correctly record source file information when LOADing a
158 ;;; non-compiled file. Check whether this bug exists in SBCL and fix it if so.
159 (defun load (filespec
161 (verbose *load-verbose*)
163 (if-does-not-exist t)
164 (external-format :default))
166 "Load the file given by FILESPEC into the Lisp environment, returning
168 (declare (ignore external-format))
169 (let ((*load-depth* (1+ *load-depth*))
170 ;; KLUDGE: I can't find in the ANSI spec where it says that
171 ;; DECLAIM/PROCLAIM of optimization policy should have file
172 ;; scope. CMU CL did this, and it seems reasonable, but it
173 ;; might not be right; after all, things like (PROCLAIM '(TYPE
174 ;; ..)) don't have file scope, and I can't find anything under
175 ;; PROCLAIM or COMPILE-FILE or LOAD or OPTIMIZE which
176 ;; justifies this behavior. Hmm. -- WHN 2001-04-06
177 (sb!c::*policy* sb!c::*policy*)
178 ;; The ANSI spec for LOAD says "LOAD binds *READTABLE* and
179 ;; *PACKAGE* to the values they held before loading the file."
180 (*package* (sane-package))
181 (*readtable* *readtable*)
182 ;; The old CMU CL LOAD function used an IF-DOES-NOT-EXIST
183 ;; argument of (MEMBER :ERROR NIL) type. ANSI constrains us to
184 ;; accept a generalized boolean argument value for this
185 ;; externally-visible function, but the internal functions
186 ;; still use the old convention.
187 (internal-if-does-not-exist (if if-does-not-exist :error nil)))
188 ;; FIXME: This VALUES wrapper is inherited from CMU CL. Once SBCL
189 ;; gets function return type checking right, we can achieve a
190 ;; similar effect better by adding FTYPE declarations.
192 (if (streamp filespec)
193 (if (or (equal (stream-element-type filespec)
195 (load-as-fasl filespec verbose print)
196 (load-as-source filespec verbose print))
197 (let* ((pathname (pathname filespec))
198 (physical-pathname (translate-logical-pathname pathname))
199 (probed-file (probe-file physical-pathname)))
201 (pathname-type physical-pathname))
202 (internal-load physical-pathname
204 internal-if-does-not-exist
207 (internal-load-default-type pathname
208 internal-if-does-not-exist
212 ;;; Load a code object. BOX-NUM objects are popped off the stack for
213 ;;; the boxed storage section, then SIZE bytes of code are read in.
215 (defun load-code (box-num code-length)
216 (declare (fixnum box-num code-length))
218 (let ((code (%primitive sb!c:allocate-code-object box-num code-length))
219 (index (+ sb!vm:code-trace-table-offset-slot box-num)))
220 (declare (type index index))
221 (setf (%code-debug-info code) (pop-stack))
224 (setf (code-header-ref code (decf index)) (pop-stack)))
225 (sb!sys:without-gcing
226 (read-n-bytes *fasl-input-stream*
227 (code-instructions code)
232 ;;; Moving native code during a GC or purify is not so trivial on the
235 ;;; Our strategy for allowing the loading of x86 native code into the
236 ;;; dynamic heap requires that the addresses of fixups be saved for
237 ;;; all these code objects. After a purify these fixups can be
238 ;;; dropped. In CMU CL, this policy was enabled with
239 ;;; *ENABLE-DYNAMIC-SPACE-CODE*; in SBCL it's always used.
241 (defun load-code (box-num code-length)
242 (declare (fixnum box-num code-length))
244 (let ((stuff (list (pop-stack))))
247 (push (pop-stack) stuff))
248 (let* ((dbi (car (last stuff))) ; debug-info
249 (tto (first stuff))) ; trace-table-offset
251 (setq stuff (nreverse stuff))
253 ;; FIXME: *LOAD-CODE-VERBOSE* should probably be #!+SB-SHOW.
254 (when *load-code-verbose*
255 (format t "stuff: ~S~%" stuff)
258 (sb!c::compiled-debug-info-p dbi)
259 (sb!c::debug-info-p dbi)
260 (sb!c::compiled-debug-info-name dbi)
262 (format t " loading to the dynamic space~%"))
264 (let ((code (%primitive sb!c:allocate-code-object
267 (index (+ sb!vm:code-trace-table-offset-slot box-num)))
268 (declare (type index index))
269 (when *load-code-verbose*
272 (sb!kernel::get-lisp-obj-address code)))
273 (setf (%code-debug-info code) (pop stuff))
276 (setf (code-header-ref code (decf index)) (pop stuff)))
277 (sb!sys:without-gcing
278 (read-n-bytes *fasl-input-stream*
279 (code-instructions code)
286 ;;; how we learn about assembler routines at startup
287 (defvar *!initial-assembler-routines*)
289 (defun !loader-cold-init ()
290 (/show0 "/!loader-cold-init")
291 (dolist (routine *!initial-assembler-routines*)
292 (setf (gethash (car routine) *assembler-routines*) (cdr routine))))