target-core.lisp

开源跨平台Lisp编译器

;;;; target-only code that knows how to load compiled code directly
;;;; into core
;;;;
;;;; FIXME: The filename here is confusing because "core" here means
;;;; "main memory", while elsewhere in the system it connotes a
;;;; ".core" file dumping the contents of main memory.

;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;;
;;;; This software is derived from the CMU CL system, which was
;;;; written at Carnegie Mellon University and released into the
;;;; public domain. The software is in the public domain and is
;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.

(in-package "SB!C")

(declaim (ftype (function (fixnum fixnum) (values code-component &optional))
                allocate-code-object))
(defun allocate-code-object (boxed unboxed)
  #!+gencgc
  (without-gcing
    (%make-lisp-obj
     (alien-funcall (extern-alien "alloc_code_object" (function unsigned-long unsigned unsigned))
                    boxed unboxed)))
  #!-gencgc
  (%primitive allocate-code-object boxed unboxed))

;;; Make a function entry, filling in slots from the ENTRY-INFO.
(defun make-fun-entry (entry-info code-obj object)
  (declare (type entry-info entry-info) (type core-object object))
  (let ((offset (label-position (entry-info-offset entry-info))))
    (declare (type index offset))
    (unless (zerop (logand offset sb!vm:lowtag-mask))
      (error "Unaligned function object, offset = #X~X." offset))
    (let ((res (%primitive compute-fun code-obj offset)))
      (setf (%simple-fun-self res) res)
      (setf (%simple-fun-next res) (%code-entry-points code-obj))
      (setf (%code-entry-points code-obj) res)
      (setf (%simple-fun-name res) (entry-info-name entry-info))
      (setf (%simple-fun-arglist res) (entry-info-arguments entry-info))
      (setf (%simple-fun-type res) (entry-info-type entry-info))
      (setf (%simple-fun-xrefs res) (entry-info-xref entry-info))

      (note-fun entry-info res object))))

;;; Dump a component to core. We pass in the assembler fixups, code
;;; vector and node info.
(defun make-core-component (component segment length trace-table fixup-notes object)
  (declare (type component component)
           (type sb!assem:segment segment)
           (type index length)
           (list trace-table fixup-notes)
           (type core-object object))
  (without-gcing
    (let* ((2comp (component-info component))
           (constants (ir2-component-constants 2comp))
           (trace-table (pack-trace-table trace-table))
           (trace-table-len (length trace-table))
           (trace-table-bits (* trace-table-len tt-bits-per-entry))
           (total-length (+ length
                            (ceiling trace-table-bits sb!vm:n-byte-bits)))
           (box-num (- (length constants) sb!vm:code-trace-table-offset-slot))
           (code-obj (allocate-code-object box-num total-length))
           (fill-ptr (code-instructions code-obj)))
      (declare (type index box-num total-length))

      (sb!assem:on-segment-contents-vectorly
       segment
       (lambda (v)
         (declare (type (simple-array sb!assem:assembly-unit 1) v))
         (copy-byte-vector-to-system-area v fill-ptr)
         (setf fill-ptr (sap+ fill-ptr (length v)))))

      (do-core-fixups code-obj fixup-notes)

      (dolist (entry (ir2-component-entries 2comp))
        (make-fun-entry entry code-obj object))

      (sb!vm:sanctify-for-execution code-obj)

      (let ((info (debug-info-for-component component)))
        (push info (core-object-debug-info object))
        (setf (%code-debug-info code-obj) info))

      (setf (code-header-ref code-obj sb!vm:code-trace-table-offset-slot)
            length)
      ;; KLUDGE: the "old" COPY-TO-SYSTEM-AREA automagically worked if
      ;; somebody changed the number of bytes in a trace table entry.
      ;; This version is a bit more fragile; if only there were some way
      ;; to insulate ourselves against changes like that...
      ;;
      ;; Then again, PACK-TRACE-TABLE in src/compiler/trace-table.lisp
      ;; doesn't appear to do anything interesting, returning a 0-length
      ;; array.  So it seemingly doesn't matter what we do here.  Is this
      ;; stale code?
      ;;   --njf, 2005-03-23
      (copy-ub16-to-system-area trace-table 0 fill-ptr 0 trace-table-len)

      (do ((index sb!vm:code-constants-offset (1+ index)))
          ((>= index (length constants)))
        (let ((const (aref constants index)))
          (etypecase const
            (null)
            (constant
             (setf (code-header-ref code-obj index)
                   (constant-value const)))
            (list
             (ecase (car const)
               (:entry
                (reference-core-fun code-obj index (cdr const) object))
               (:fdefinition
                (setf (code-header-ref code-obj index)
                      (fdefinition-object (cdr const) t))))))))))
  (values))