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 ;;; a helper function for LOAD: Load the stuff in a file when we have the name.
46 (defun internal-load (pathname truename if-does-not-exist verbose print
48 (declare (type (member nil :error) if-does-not-exist))
51 (error 'simple-file-error
53 :format-control "~S does not exist."
54 :format-arguments (list (namestring pathname)))
55 (return-from internal-load nil)))
57 (let ((*load-truename* truename)
58 (*load-pathname* pathname))
61 (with-open-file (stream truename
63 :if-does-not-exist if-does-not-exist)
64 (load-as-source stream verbose print)))
66 (with-open-file (stream truename
68 :if-does-not-exist if-does-not-exist
69 :element-type '(unsigned-byte 8))
70 (load-as-fasl stream verbose print)))
72 (let ((first-line (with-open-file (stream truename :direction :input)
73 (read-line stream nil)))
74 (fhsss *fasl-header-string-start-string*))
77 (>= (length (the simple-string first-line))
79 (string= first-line fhsss :end1 (length fhsss)))
80 (internal-load pathname truename if-does-not-exist verbose print
83 (when (string= (pathname-type truename) *fasl-file-type*)
84 (error "File has a fasl file type, but no fasl file header:~% ~S"
85 (namestring truename)))
86 (internal-load pathname truename if-does-not-exist verbose print
89 ;;; a helper function for INTERNAL-LOAD-DEFAULT-TYPE: Try the default
90 ;;; file type TYPE and return (VALUES PATHNAME TRUENAME) for a match,
91 ;;; or (VALUES PATHNAME NIL) if the file doesn't exist.
93 ;;; This is analogous to CMU CL's TRY-DEFAULT-TYPES, but we only try a
94 ;;; single type. By avoiding CMU CL's generality here, we avoid having
95 ;;; to worry about some annoying ambiguities. (E.g. what if the
96 ;;; possible types are ".lisp" and ".cl", and both "foo.lisp" and
98 (defun try-default-type (pathname type)
99 (let ((pn (translate-logical-pathname (make-pathname :type type :defaults pathname))))
100 (values pn (probe-file pn))))
102 ;;; a helper function for LOAD: Handle the case of INTERNAL-LOAD where
103 ;;; the file does not exist.
104 (defun internal-load-default-type (pathname if-does-not-exist verbose print)
105 (declare (type (member nil :error) if-does-not-exist))
106 (multiple-value-bind (src-pn src-tn)
107 (try-default-type pathname *load-source-default-type*)
108 (multiple-value-bind (obj-pn obj-tn)
109 (try-default-type pathname *fasl-file-type*)
113 (> (file-write-date src-tn) (file-write-date obj-tn)))
115 (error "The object file ~A is~@
116 older than the presumed source:~% ~A."
119 ;; FIXME: In CMU CL one of these was a CONTINUE case.
120 ;; There's not one now. I don't remember how restart-case
121 ;; works very well, make sure that it doesn't do anything
122 ;; weird when we don't specify the CONTINUE case.
123 (source () :report "load source file"
124 (internal-load src-pn src-tn if-does-not-exist verbose print
126 (object () :report "load object file"
127 (internal-load src-pn obj-tn if-does-not-exist verbose print
130 (internal-load obj-pn obj-tn if-does-not-exist verbose print :binary))
132 (internal-load src-pn src-tn if-does-not-exist verbose print :source))
134 (internal-load pathname nil if-does-not-exist verbose print nil))))))
136 ;;; This function mainly sets up special bindings and then calls
137 ;;; sub-functions. We conditionally bind the switches with PROGV so
138 ;;; that people can set them in their init files and have the values
139 ;;; take effect. If the compiler is loaded, we make the
140 ;;; compiler-policy local to LOAD by binding it to itself.
142 ;;; FIXME: Daniel Barlow's ilsb.tar ILISP-for-SBCL patches contain an
143 ;;; implementation of "DEFUN SOURCE-FILE" which claims, in a comment, that CMU
144 ;;; CL does not correctly record source file information when LOADing a
145 ;;; non-compiled file. Check whether this bug exists in SBCL and fix it if so.
146 (defun load (filespec
148 (verbose *load-verbose*)
150 (if-does-not-exist t)
151 (external-format :default))
153 "Load the file given by FILESPEC into the Lisp environment, returning
155 (unless (eq external-format :default)
156 (error "Non-:DEFAULT EXTERNAL-FORMAT values are not supported."))
158 (let ((*load-depth* (1+ *load-depth*))
159 ;; KLUDGE: I can't find in the ANSI spec where it says that
160 ;; DECLAIM/PROCLAIM of optimization policy should have file
161 ;; scope. CMU CL did this, and it seems reasonable, but it
162 ;; might not be right; after all, things like (PROCLAIM '(TYPE
163 ;; ..)) don't have file scope, and I can't find anything under
164 ;; PROCLAIM or COMPILE-FILE or LOAD or OPTIMIZE which
165 ;; justifies this behavior. Hmm. -- WHN 2001-04-06
166 (sb!c::*policy* sb!c::*policy*)
167 ;; The ANSI spec for LOAD says "LOAD binds *READTABLE* and
168 ;; *PACKAGE* to the values they held before loading the file."
169 (*package* (sane-package))
170 (*readtable* *readtable*)
171 ;; The old CMU CL LOAD function used an IF-DOES-NOT-EXIST
172 ;; argument of (MEMBER :ERROR NIL) type. ANSI constrains us to
173 ;; accept a generalized boolean argument value for this
174 ;; externally-visible function, but the internal functions
175 ;; still use the old convention.
176 (internal-if-does-not-exist (if if-does-not-exist :error nil)))
177 ;; FIXME: This VALUES wrapper is inherited from CMU CL. Once SBCL
178 ;; gets function return type checking right, we can achieve a
179 ;; similar effect better by adding FTYPE declarations.
181 (if (streamp filespec)
182 (if (or (equal (stream-element-type filespec)
184 (load-as-fasl filespec verbose print)
185 (load-as-source filespec verbose print))
186 (let* ((pathname (pathname filespec))
187 (physical-pathname (translate-logical-pathname pathname)))
188 (if (or (probe-file physical-pathname) (pathname-type physical-pathname))
189 (internal-load physical-pathname
190 (truename physical-pathname)
191 internal-if-does-not-exist
195 (internal-load-default-type pathname
196 internal-if-does-not-exist
200 ;;; Load a code object. BOX-NUM objects are popped off the stack for
201 ;;; the boxed storage section, then SIZE bytes of code are read in.
203 (defun load-code (box-num code-length)
204 (declare (fixnum box-num code-length))
206 (let ((code (%primitive sb!c:allocate-code-object box-num code-length))
207 (index (+ sb!vm:code-trace-table-offset-slot box-num)))
208 (declare (type index index))
209 (setf (%code-debug-info code) (pop-stack))
212 (setf (code-header-ref code (decf index)) (pop-stack)))
213 (sb!sys:without-gcing
214 (read-n-bytes *fasl-input-stream*
215 (code-instructions code)
220 ;;; Moving native code during a GC or purify is not so trivial on the
223 ;;; Our strategy for allowing the loading of x86 native code into the
224 ;;; dynamic heap requires that the addresses of fixups be saved for
225 ;;; all these code objects. After a purify these fixups can be
226 ;;; dropped. In CMU CL, this policy was enabled with
227 ;;; *ENABLE-DYNAMIC-SPACE-CODE*; in SBCL it's always used.
229 (defun load-code (box-num code-length)
230 (declare (fixnum box-num code-length))
232 (let ((stuff (list (pop-stack))))
235 (push (pop-stack) stuff))
236 (let* ((dbi (car (last stuff))) ; debug-info
237 (tto (first stuff)) ; trace-table-offset
238 ;; Old CMU CL code had maybe-we-shouldn't-load-to-dyn-space
239 ;; pussyfooting around here, apparently dating back to the
240 ;; stone age of the X86 port, but in SBCL we always load
241 ;; to dynamic space. FIXME: So now this "variable" could go
243 (load-to-dynamic-space t))
245 (setq stuff (nreverse stuff))
247 ;; FIXME: *LOAD-CODE-VERBOSE* should probably be #!+SB-SHOW.
248 (when *load-code-verbose*
249 (format t "stuff: ~S~%" stuff)
252 (sb!c::compiled-debug-info-p dbi)
253 (sb!c::debug-info-p dbi)
254 (sb!c::compiled-debug-info-name dbi)
256 (if load-to-dynamic-space
257 (format t " loading to the dynamic space~%")
258 (format t " loading to the static space~%")))
261 (if load-to-dynamic-space
262 (%primitive sb!c:allocate-dynamic-code-object
265 (%primitive sb!c:allocate-code-object
268 (index (+ sb!vm:code-trace-table-offset-slot box-num)))
269 (declare (type index index))
270 (when *load-code-verbose*
273 (sb!kernel::get-lisp-obj-address code)))
274 (setf (%code-debug-info code) (pop stuff))
277 (setf (code-header-ref code (decf index)) (pop stuff)))
278 (sb!sys:without-gcing
279 (read-n-bytes *fasl-input-stream*
280 (code-instructions code)
287 ;;; how we learn about assembler routines and foreign symbols at startup
288 (defvar *!initial-assembler-routines*)
289 (defvar *!initial-foreign-symbols*)
290 (defun !loader-cold-init ()
291 (dolist (routine *!initial-assembler-routines*)
292 (setf (gethash (car routine) *assembler-routines*) (cdr routine)))
293 (dolist (symbol *!initial-foreign-symbols*)
294 (setf (gethash (car symbol) *static-foreign-symbols*) (cdr symbol))))
296 (declaim (ftype (function (string) sb!vm:word)
297 foreign-symbol-address-as-integer))
300 ;;; SB!SYS:GET-DYNAMIC-FOREIGN-SYMBOL-ADDRESS is in foreign.lisp, on
301 ;;; platforms that have dynamic loading
302 (defun foreign-symbol-address-as-integer (foreign-symbol)
303 (or (find-foreign-symbol-in-table foreign-symbol *static-foreign-symbols*)
304 (sb!sys:get-dynamic-foreign-symbol-address foreign-symbol)
305 (error "unknown foreign symbol: ~S" foreign-symbol)))
307 (defun foreign-symbol-address (symbol)
308 (int-sap (foreign-symbol-address-as-integer
309 (sb!vm:extern-alien-name symbol))))