X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fload.lisp;h=e68ff75a1a21c83bde36c1e05547c04e66142532;hb=913e06f191acb65c1d99d42234704bec38500ff4;hp=06d18b85905e7e20ee3bba04dde20b169578a3c7;hpb=143edab8d233c784cde14bce6c5165219ea84bf4;p=sbcl.git diff --git a/src/code/load.lisp b/src/code/load.lisp index 06d18b8..e68ff75 100644 --- a/src/code/load.lisp +++ b/src/code/load.lisp @@ -14,59 +14,7 @@ ;;;; provided with absolutely no warranty. See the COPYING and CREDITS ;;;; files for more information. -(in-package "SB!IMPL") - -;;;; variables - -;;; FIXME: It's awkward having LOAD stuff in SB!IMPL and dump stuff in -;;; SB!C. Among other things, it makes it hard to figure out where -;;; *FASL-HEADER-STRING-START-STRING* and -;;; *FASL-HEADER-STRING-STOP-CHAR-CODE* should go. Perhaps we should -;;; make a package called SB-DUMP or SB-LD which includes all -;;; knowledge of both loading and dumping. - -;;; This value is used to identify fasl files. Even though this is not -;;; declared as a constant (because ANSI Common Lisp has no facility -;;; for declaring values which are constant under EQUAL but not EQL), -;;; obviously you shouldn't mess with it lightly. If you do set a new -;;; value for some reason, keep these things in mind: -;;; * To avoid confusion with the similar but incompatible CMU CL -;;; fasl file format, the value should not be "FASL FILE", which -;;; is what CMU CL used for the same purpose. -;;; * Since its presence at the head of a file is used by LOAD to -;;; decide whether a file is to be fasloaded or sloloaded, the value -;;; should be something which can't legally appear at the head of a -;;; Lisp source file. -;;; * The value should not contain any line-terminating characters, -;;; because they're hard to express portably and because the LOAD -;;; code might reasonably use READ-LINE to get the value to compare -;;; against. -(defparameter sb!c:*fasl-header-string-start-string* "# FASL" - #!+sb-doc - "a string which appears at the start of a fasl file header") - -(defparameter sb!c:*fasl-header-string-stop-char-code* 255 - #!+sb-doc - "the code for a character which terminates a fasl file header") - -(defvar *load-depth* 0 - #!+sb-doc - "the current number of recursive loads") -(declaim (type index *load-depth*)) - -;;; the FASL file we're reading from -(defvar *fasl-file*) -(declaim (type lisp-stream *fasl-file*)) - -(defvar *load-print* nil - #!+sb-doc - "the default for the :PRINT argument to LOAD") -(defvar *load-verbose* nil - ;; Note that CMU CL's default for this was T, and ANSI says it's - ;; implementation-dependent. We choose NIL on the theory that it's - ;; a nicer default behavior for Unix programs. - #!+sb-doc - "the default for the :VERBOSE argument to LOAD") +(in-package "SB!FASL") ;;;; miscellaneous load utilities @@ -134,15 +82,16 @@ (cnt 1 (1+ cnt))) ((>= cnt n) res)))) -;;; Read an N-byte unsigned integer from the *FASL-FILE* +;;; Read an N-byte unsigned integer from the *FASL-INPUT-STREAM* (defmacro read-arg (n) (declare (optimize (speed 0))) (if (= n 1) - `(the (unsigned-byte 8) (read-byte *fasl-file*)) - `(prepare-for-fast-read-byte *fasl-file* + `(the (unsigned-byte 8) (read-byte *fasl-input-stream*)) + `(prepare-for-fast-read-byte *fasl-input-stream* (prog1 (fast-read-u-integer ,n) (done-with-fast-read-byte))))) + ;;; FIXME: This deserves a more descriptive name, and should probably ;;; be implemented as an ordinary function, not a macro. ;;; @@ -155,9 +104,11 @@ ;;; offset. We may need to have several, since LOAD can be called ;;; recursively. -(defvar *free-fop-tables* (list (make-array 1000)) - #!+sb-doc - "List of free fop tables for the fasloader.") +;;; a list of free fop tables for the fasloader +;;; +;;; FIXME: Is it really a win to have this permanently bound? +;;; Couldn't we just bind it on entry to LOAD-AS-FASL? +(defvar *free-fop-tables* (list (make-array 1000))) ;;; the current fop table (defvar *current-fop-table*) @@ -190,14 +141,12 @@ ;;;; the fop stack -;;; (This is in a simple-vector, but it grows down, since it is +;;; (This is in a SIMPLE-VECTOR, but it grows down, since it is ;;; somewhat cheaper to test for overflow that way.) -(defvar *fop-stack* (make-array 100) - #!+sb-doc - "The fop stack (we only need one!).") +(defvar *fop-stack* (make-array 100)) (declaim (simple-vector *fop-stack*)) -;;; the index of the most recently pushed item on the fop-stack +;;; the index of the most recently pushed item on the fop stack (defvar *fop-stack-pointer* 100) ;;; the current index into the fop stack when we last recursively @@ -215,11 +164,11 @@ (setq *fop-stack-pointer* size) (setq *fop-stack* new-stack))) -;;; Cache information about the fop-stack in local variables. Define a +;;; Cache information about the fop stack in local variables. Define a ;;; local macro to pop from the stack. Push the result of evaluation ;;; if specified. (defmacro with-fop-stack (pushp &body forms) - (check-type pushp (member nil t :nope)) + (aver (member pushp '(nil t :nope))) (let ((n-stack (gensym)) (n-index (gensym)) (n-res (gensym))) @@ -251,12 +200,12 @@ (progn ,@forms) (setq *fop-stack-pointer* ,n-index))))))) -;;;; FASLOAD +;;;; LOAD-AS-FASL ;;;; -;;;; Note: FASLOAD is used not only by LOAD, but also (after suitable -;;;; modification of the fop table) in genesis. Therefore, it's needed -;;;; not only in the target Lisp, but also in the cross-compilation -;;;; host. +;;;; Note: LOAD-AS-FASL is used not only by LOAD, but also (with +;;;; suitable modification of the fop table) in GENESIS. Therefore, +;;;; it's needed not only in the target Lisp, but also in the +;;;; cross-compilation host. ;;; a helper function for LOAD-FASL-GROUP ;;; @@ -269,18 +218,19 @@ (when byte ;; Read the string part of the fasl header, or die. - (let* ((fhsss sb!c:*fasl-header-string-start-string*) + (let* ((fhsss *fasl-header-string-start-string*) (fhsss-length (length fhsss))) (unless (= byte (char-code (schar fhsss 0))) - (error "illegal fasl file header")) + (error "illegal first byte in fasl file header")) (do ((byte (read-byte stream) (read-byte stream)) (count 1 (1+ count))) - ((= byte sb!c:*fasl-header-string-stop-char-code*) + ((= byte +fasl-header-string-stop-char-code+) t) (declare (fixnum byte count)) (when (and (< count fhsss-length) (not (eql byte (char-code (schar fhsss count))))) - (error "illegal fasl file header")))) + (error + "illegal subsequent (not first) byte in fasl file header")))) ;; Read and validate implementation and version, or die. (let* ((implementation-length (read-arg 4)) @@ -294,34 +244,33 @@ (flet ((check-version (variant possible-implementation needed-version) (when (string= possible-implementation implementation) (unless (= version needed-version) - (error "~@<~S was compiled for ~A fasl file format ~ - version ~D, but we need version ~D.~:@>" + (error "~@<~S is in ~A fasl file format version ~D, ~ + but this version of SBCL uses ~ + format version ~D.~:@>" stream variant version needed-version)) t))) (or (check-version "native code" - #.sb!c:*backend-fasl-file-implementation* - #.sb!c:*backend-fasl-file-version*) - (check-version "byte code" - #.(sb!c:backend-byte-fasl-file-implementation) - sb!c:byte-fasl-file-version) + +backend-fasl-file-implementation+ + +fasl-file-version+) (error "~S was compiled for implementation ~A, but this is a ~A." stream implementation - sb!c:*backend-fasl-file-implementation*))))))) + +backend-fasl-file-implementation+))))))) ;; Setting this variable gives you a trace of fops as they are loaded and ;; executed. #!+sb-show (defvar *show-fops-p* nil) -;;; a helper function for FASLOAD +;;; a helper function for LOAD-AS-FASL ;;; -;;; Return true if we successfully load a group from the stream, or NIL if EOF -;;; was encountered while trying to read from the stream. Dispatch to the right -;;; function for each fop. Special-case FOP-BYTE-PUSH since it is real common. +;;; Return true if we successfully load a group from the stream, or +;;; NIL if EOF was encountered while trying to read from the stream. +;;; Dispatch to the right function for each fop. Special-case +;;; FOP-BYTE-PUSH since it is real common. (defun load-fasl-group (stream) (when (check-fasl-header stream) (catch 'fasl-group-end @@ -370,7 +319,7 @@ (svref *current-fop-table* (read-byte stream)))) (funcall (the function (svref *fop-functions* byte)))))))))) -(defun fasload (stream verbose print) +(defun load-as-fasl (stream verbose print) ;; KLUDGE: ANSI says it's good to do something with the :PRINT ;; argument to LOAD when we're fasloading a file, but currently we ;; don't. (CMU CL did, but implemented it in a non-ANSI way, and I @@ -379,7 +328,7 @@ (when (zerop (file-length stream)) (error "attempt to load an empty FASL file:~% ~S" (namestring stream))) (do-load-verbose stream verbose) - (let* ((*fasl-file* stream) + (let* ((*fasl-input-stream* stream) (*current-fop-table* (or (pop *free-fop-tables*) (make-array 1000))) (*current-fop-table-size* (length *current-fop-table*)) (*fop-stack-pointer-on-entry* *fop-stack-pointer*)) @@ -399,6 +348,20 @@ (fill *fop-stack* nil :end *fop-stack-pointer-on-entry*) (fill *current-fop-table* nil))) t) + +;;; This is used in in target-load and also genesis, using +;;; *COLD-FOREIGN-SYMBOL-TABLE*. All the speculative prefix-adding +;;; code for foreign symbol lookup should be here. +(defun find-foreign-symbol-in-table (name table) + (let ((prefixes + #!+(or linux freebsd) #("" "ldso_stub__") + #!+openbsd #("" "_"))) + (some (lambda (prefix) + (gethash (concatenate 'string prefix name) + table + nil)) + prefixes))) + ;;;; stuff for debugging/tuning by collecting statistics on FOPs (?)