src/code/target-load.lisp

   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")
   4
   5 ;;;; This software is part of the SBCL system. See the README file for
   6 ;;;; more information.
   7 ;;;;
   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.
  13
  14 (in-package "SB!FASL")
  15
  16 (defvar *load-source-default-type* "lisp"
  17   #!+sb-doc
  18   "The source file types which LOAD looks for by default.")
  19
  20 (declaim (type (or pathname null) *load-truename* *load-pathname*))
  21 (defvar *load-truename* nil
  22   #!+sb-doc
  23   "the TRUENAME of the file that LOAD is currently loading")
  24 (defvar *load-pathname* nil
  25   #!+sb-doc
  26   "the defaulted pathname that LOAD is currently loading")
  27 \f
  28 ;;;; LOAD-AS-SOURCE
  29
  30 ;;; Load a text file.
  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*)
  36        t)
  37     (if print
  38         (let ((results (multiple-value-list (eval sexpr))))
  39           (load-fresh-line)
  40           (format t "~{~S~^, ~}~%" results))
  41       (eval sexpr))))
  42 \f
  43 ;;;; LOAD itself
  44
  45 ;;; a helper function for LOAD: Load the stuff in a file when we have
  46 ;;; the name.
  47 (defun internal-load (pathname truename if-does-not-exist verbose print
  48                       &optional contents)
  49   (declare (type (member nil :error) if-does-not-exist))
  50   (unless truename
  51     (if if-does-not-exist
  52         (error 'simple-file-error
  53                :pathname pathname
  54                :format-control "~S does not exist."
  55                :format-arguments (list (namestring pathname)))
  56         (return-from internal-load nil)))
  57
  58   (let ((*load-truename* truename)
  59         (*load-pathname* pathname))
  60     (case contents
  61       (:source
  62        (with-open-file (stream truename
  63                                :direction :input
  64                                :if-does-not-exist if-does-not-exist)
  65          (load-as-source stream verbose print)))
  66       (:binary
  67        (with-open-file (stream truename
  68                                :direction :input
  69                                :if-does-not-exist if-does-not-exist
  70                                :element-type '(unsigned-byte 8))
  71          (load-as-fasl stream verbose print)))
  72       (t
  73        (let ((first-line (with-open-file (stream truename :direction :input)
  74                            (read-line stream nil)))
  75              (fhsss *fasl-header-string-start-string*))
  76          (cond
  77           ((and first-line
  78                 (>= (length (the simple-string first-line))
  79                     (length fhsss))
  80                 (string= first-line fhsss :end1 (length fhsss)))
  81            (internal-load pathname truename if-does-not-exist verbose print
  82                           :binary))
  83           (t
  84            (when (string= (pathname-type truename) *fasl-file-type*)
  85              (error "File has a fasl file type, but no fasl file header:~%  ~S"
  86                     (namestring truename)))
  87            (internal-load pathname truename if-does-not-exist verbose print
  88                           :source))))))))
  89
  90 ;;; a helper function for INTERNAL-LOAD-DEFAULT-TYPE: Try the default
  91 ;;; file type TYPE and return (VALUES PATHNAME TRUENAME) for a match,
  92 ;;; or (VALUES PATHNAME NIL) if the file doesn't exist.
  93 ;;;
  94 ;;; This is analogous to CMU CL's TRY-DEFAULT-TYPES, but we only try a
  95 ;;; single type. By avoiding CMU CL's generality here, we avoid having
  96 ;;; to worry about some annoying ambiguities. (E.g. what if the
  97 ;;; possible types are ".lisp" and ".cl", and both "foo.lisp" and
  98 ;;; "foo.cl" exist?)
  99 (defun try-default-type (pathname type)
 100   (let ((pn (translate-logical-pathname (make-pathname :type type :defaults pathname))))
 101     (values pn (probe-file pn))))
 102
 103 ;;; a helper function for LOAD: Handle the case of INTERNAL-LOAD where
 104 ;;; the file does not exist.
 105 (defun internal-load-default-type (pathname if-does-not-exist verbose print)
 106   (declare (type (member nil :error) if-does-not-exist))
 107   (multiple-value-bind (src-pn src-tn)
 108       (try-default-type pathname *load-source-default-type*)
 109     (multiple-value-bind (obj-pn obj-tn)
 110         (try-default-type pathname *fasl-file-type*)
 111       (cond
 112        ((and obj-tn
 113              src-tn
 114              (> (file-write-date src-tn) (file-write-date obj-tn)))
 115         (restart-case
 116          (error "The object file ~A is~@
 117                 older than the presumed source:~%  ~A."
 118                 (namestring obj-tn)
 119                 (namestring src-tn))
 120          ;; FIXME: In CMU CL one of these was a CONTINUE case.
 121          ;; There's not one now. I don't remember how restart-case
 122          ;; works very well, make sure that it doesn't do anything
 123          ;; weird when we don't specify the CONTINUE case.
 124          (source () :report "load source file"
 125            (internal-load src-pn src-tn if-does-not-exist verbose print
 126                           :source))
 127          (object () :report "load object file"
 128             (internal-load src-pn obj-tn if-does-not-exist verbose print
 129                            :binary))))
 130        (obj-tn
 131         (internal-load obj-pn obj-tn if-does-not-exist verbose print :binary))
 132        (src-pn
 133         (internal-load src-pn src-tn if-does-not-exist verbose print :source))
 134        (t
 135         (internal-load pathname nil if-does-not-exist verbose print nil))))))
 136
 137 ;;; This function mainly sets up special bindings and then calls
 138 ;;; sub-functions. We conditionally bind the switches with PROGV so
 139 ;;; that people can set them in their init files and have the values
 140 ;;; take effect. If the compiler is loaded, we make the
 141 ;;; compiler-policy local to LOAD by binding it to itself.
 142 ;;;
 143 ;;; FIXME: Daniel Barlow's ilsb.tar ILISP-for-SBCL patches contain an
 144 ;;; implementation of "DEFUN SOURCE-FILE" which claims, in a comment, that CMU
 145 ;;; CL does not correctly record source file information when LOADing a
 146 ;;; non-compiled file. Check whether this bug exists in SBCL and fix it if so.
 147 (defun load (filespec
 148              &key
 149              (verbose *load-verbose*)
 150              (print *load-print*)
 151              (if-does-not-exist t)
 152              (external-format :default))
 153   #!+sb-doc
 154   "Load the file given by FILESPEC into the Lisp environment, returning
 155    T on success."
 156   (unless (eq external-format :default)
 157     (error "Non-:DEFAULT EXTERNAL-FORMAT values are not supported."))
 158
 159   (let ((*load-depth* (1+ *load-depth*))
 160         ;; KLUDGE: I can't find in the ANSI spec where it says that
 161         ;; DECLAIM/PROCLAIM of optimization policy should have file
 162         ;; scope. CMU CL did this, and it seems reasonable, but it
 163         ;; might not be right; after all, things like (PROCLAIM '(TYPE
 164         ;; ..)) don't have file scope, and I can't find anything under
 165         ;; PROCLAIM or COMPILE-FILE or LOAD or OPTIMIZE which
 166         ;; justifies this behavior. Hmm. -- WHN 2001-04-06
 167         (sb!c::*policy* sb!c::*policy*)
 168         ;; The ANSI spec for LOAD says "LOAD binds *READTABLE* and
 169         ;; *PACKAGE* to the values they held before loading the file."
 170         (*package* (sane-package))
 171         (*readtable* *readtable*)
 172         ;; The old CMU CL LOAD function used an IF-DOES-NOT-EXIST
 173         ;; argument of (MEMBER :ERROR NIL) type. ANSI constrains us to
 174         ;; accept a generalized boolean argument value for this
 175         ;; externally-visible function, but the internal functions
 176         ;; still use the old convention.
 177         (internal-if-does-not-exist (if if-does-not-exist :error nil)))
 178     ;; FIXME: This VALUES wrapper is inherited from CMU CL. Once SBCL
 179     ;; gets function return type checking right, we can achieve a
 180     ;; similar effect better by adding FTYPE declarations.
 181     (values
 182      (if (streamp filespec)
 183          (if (or (equal (stream-element-type filespec)
 184                         '(unsigned-byte 8)))
 185              (load-as-fasl filespec verbose print)
 186              (load-as-source filespec verbose print))
 187          (let* ((pathname (pathname filespec))
 188                 (physical-pathname (translate-logical-pathname pathname))
 189                 (probed-file (probe-file physical-pathname)))
 190            (if (or probed-file
 191                    (pathname-type physical-pathname))
 192                (internal-load physical-pathname
 193                               probed-file
 194                               internal-if-does-not-exist
 195                               verbose
 196                               print)
 197                (internal-load-default-type pathname
 198                                            internal-if-does-not-exist
 199                                            verbose
 200                                            print)))))))
 201 \f
 202 ;;; Load a code object. BOX-NUM objects are popped off the stack for
 203 ;;; the boxed storage section, then SIZE bytes of code are read in.
 204 #!-x86
 205 (defun load-code (box-num code-length)
 206   (declare (fixnum box-num code-length))
 207   (with-fop-stack t
 208     (let ((code (%primitive sb!c:allocate-code-object box-num code-length))
 209           (index (+ sb!vm:code-trace-table-offset-slot box-num)))
 210       (declare (type index index))
 211       (setf (%code-debug-info code) (pop-stack))
 212       (dotimes (i box-num)
 213         (declare (fixnum i))
 214         (setf (code-header-ref code (decf index)) (pop-stack)))
 215       (sb!sys:without-gcing
 216         (read-n-bytes *fasl-input-stream*
 217                       (code-instructions code)
 218                       0
 219                       code-length))
 220       code)))
 221
 222 ;;; Moving native code during a GC or purify is not so trivial on the
 223 ;;; x86 port.
 224 ;;;
 225 ;;; Our strategy for allowing the loading of x86 native code into the
 226 ;;; dynamic heap requires that the addresses of fixups be saved for
 227 ;;; all these code objects. After a purify these fixups can be
 228 ;;; dropped. In CMU CL, this policy was enabled with
 229 ;;; *ENABLE-DYNAMIC-SPACE-CODE*; in SBCL it's always used.
 230 #!+x86
 231 (defun load-code (box-num code-length)
 232   (declare (fixnum box-num code-length))
 233   (with-fop-stack t
 234     (let ((stuff (list (pop-stack))))
 235       (dotimes (i box-num)
 236         (declare (fixnum i))
 237         (push (pop-stack) stuff))
 238       (let* ((dbi (car (last stuff)))   ; debug-info
 239              (tto (first stuff))        ; trace-table-offset
 240              ;; Old CMU CL code had maybe-we-shouldn't-load-to-dyn-space
 241              ;; pussyfooting around here, apparently dating back to the
 242              ;; stone age of the X86 port, but in SBCL we always load
 243              ;; to dynamic space. FIXME: So now this "variable" could go
 244              ;; away entirely.
 245              (load-to-dynamic-space t))
 246
 247         (setq stuff (nreverse stuff))
 248
 249         ;; FIXME: *LOAD-CODE-VERBOSE* should probably be #!+SB-SHOW.
 250         (when *load-code-verbose*
 251               (format t "stuff: ~S~%" stuff)
 252               (format t
 253                       "   : ~S ~S ~S ~S~%"
 254                       (sb!c::compiled-debug-info-p dbi)
 255                       (sb!c::debug-info-p dbi)
 256                       (sb!c::compiled-debug-info-name dbi)
 257                       tto)
 258               (if load-to-dynamic-space
 259                   (format t "   loading to the dynamic space~%")
 260                   (format t "   loading to the static space~%")))
 261
 262         (let ((code
 263                (if load-to-dynamic-space
 264                    (%primitive sb!c:allocate-dynamic-code-object
 265                                box-num
 266                                code-length)
 267                    (%primitive sb!c:allocate-code-object
 268                                box-num
 269                                code-length)))
 270               (index (+ sb!vm:code-trace-table-offset-slot box-num)))
 271           (declare (type index index))
 272           (when *load-code-verbose*
 273             (format t
 274                     "  obj addr=~X~%"
 275                     (sb!kernel::get-lisp-obj-address code)))
 276           (setf (%code-debug-info code) (pop stuff))
 277           (dotimes (i box-num)
 278             (declare (fixnum i))
 279             (setf (code-header-ref code (decf index)) (pop stuff)))
 280           (sb!sys:without-gcing
 281            (read-n-bytes *fasl-input-stream*
 282                          (code-instructions code)
 283                          0
 284                          code-length))
 285           code)))))
 286 \f
 287 ;;;; linkage fixups
 288
 289 ;;; how we learn about assembler routines and foreign symbols at startup
 290 (defvar *!initial-assembler-routines*)
 291 (defvar *!initial-foreign-symbols*)
 292 (defun !loader-cold-init ()
 293   (dolist (routine *!initial-assembler-routines*)
 294     (setf (gethash (car routine) *assembler-routines*) (cdr routine)))
 295   (dolist (symbol *!initial-foreign-symbols*)
 296     (setf (gethash (car symbol) *static-foreign-symbols*) (cdr symbol))))
 297
 298 (declaim (ftype (function (string) sb!vm:word)
 299                 foreign-symbol-address-as-integer))
 300
 301
 302 ;;; SB!SYS:GET-DYNAMIC-FOREIGN-SYMBOL-ADDRESS is in foreign.lisp, on
 303 ;;; platforms that have dynamic loading
 304 (defun foreign-symbol-address-as-integer (foreign-symbol)
 305   (or (find-foreign-symbol-in-table  foreign-symbol *static-foreign-symbols*)
 306       (sb!sys:get-dynamic-foreign-symbol-address foreign-symbol)
 307       (error "unknown foreign symbol: ~S" foreign-symbol)))
 308
 309 (defun foreign-symbol-address (symbol)
 310   (int-sap (foreign-symbol-address-as-integer
 311             (sb!vm:extern-alien-name symbol))))