c-call.lisp

开源跨平台Lisp编译器

;;;; the VOPs and other necessary machine specific support
;;;; routines for call-out to C

;;;; 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!VM")

;; The MOVE-ARG vop is going to store args on the stack for
;; call-out. These tn's will be used for that. move-arg is normally
;; used for things going down the stack but C wants to have args
;; indexed in the positive direction.

(defun my-make-wired-tn (prim-type-name sc-name offset)
  (make-wired-tn (primitive-type-or-lose prim-type-name)
                 (sc-number-or-lose sc-name)
                 offset))

(defstruct (arg-state (:copier nil))
  (register-args 0)
  (xmm-args 0)
  (stack-frame-size 0))

(defun int-arg (state prim-type reg-sc stack-sc)
  (let ((reg-args (arg-state-register-args state)))
    (cond ((< reg-args 6)
           (setf (arg-state-register-args state) (1+ reg-args))
           (my-make-wired-tn prim-type reg-sc
                             (nth reg-args *c-call-register-arg-offsets*)))
          (t
           (let ((frame-size (arg-state-stack-frame-size state)))
             (setf (arg-state-stack-frame-size state) (1+ frame-size))
             (my-make-wired-tn prim-type stack-sc frame-size))))))

(define-alien-type-method (integer :arg-tn) (type state)
  (if (alien-integer-type-signed type)
      (int-arg state 'signed-byte-64 'signed-reg 'signed-stack)
      (int-arg state 'unsigned-byte-64 'unsigned-reg 'unsigned-stack)))

(define-alien-type-method (system-area-pointer :arg-tn) (type state)
  (declare (ignore type))
  (int-arg state 'system-area-pointer 'sap-reg 'sap-stack))

(defun float-arg (state prim-type reg-sc stack-sc)
  (let ((xmm-args (arg-state-xmm-args state)))
    (cond ((< xmm-args 8)
           (setf (arg-state-xmm-args state) (1+ xmm-args))
           (my-make-wired-tn prim-type reg-sc
                             (nth xmm-args *float-regs*)))
          (t
           (let ((frame-size (arg-state-stack-frame-size state)))
             (setf (arg-state-stack-frame-size state) (1+ frame-size))
             (my-make-wired-tn prim-type stack-sc frame-size))))))

(define-alien-type-method (double-float :arg-tn) (type state)
  (declare (ignore type))
  (float-arg state 'double-float 'double-reg 'double-stack))

(define-alien-type-method (single-float :arg-tn) (type state)
  (declare (ignore type))
  (float-arg state 'single-float 'single-reg 'single-stack))

(defstruct (result-state (:copier nil))
  (num-results 0))

(defun result-reg-offset (slot)
  (ecase slot
    (0 eax-offset)
    (1 edx-offset)))

;; XXX The return handling probably doesn't conform to the ABI

(define-alien-type-method (integer :result-tn) (type state)
  (let ((num-results (result-state-num-results state)))
    (setf (result-state-num-results state) (1+ num-results))
    (multiple-value-bind (ptype reg-sc)
        (if (alien-integer-type-signed type)
            (values 'signed-byte-64 'signed-reg)
            (values 'unsigned-byte-64 'unsigned-reg))
      (my-make-wired-tn ptype reg-sc (result-reg-offset num-results)))))

(define-alien-type-method (integer :naturalize-gen) (type alien)
  (if (and (alien-integer-type-signed type)
           (<= (alien-type-bits type) 32))
      `(sign-extend ,alien)
      alien))

(define-alien-type-method (system-area-pointer :result-tn) (type state)
  (declare (ignore type))
  (let ((num-results (result-state-num-results state)))
    (setf (result-state-num-results state) (1+ num-results))
    (my-make-wired-tn 'system-area-pointer 'sap-reg
                      (result-reg-offset num-results))))

(define-alien-type-method (double-float :result-tn) (type state)
  (declare (ignore type))
  (let ((num-results (result-state-num-results state)))
    (setf (result-state-num-results state) (1+ num-results))
    (my-make-wired-tn 'double-float 'double-reg num-results)))

(define-alien-type-method (single-float :result-tn) (type state)
  (declare (ignore type))
  (let ((num-results (result-state-num-results state)))
    (setf (result-state-num-results state) (1+ num-results))
    (my-make-wired-tn 'single-float 'single-reg num-results)))

(define-alien-type-method (values :result-tn) (type state)
  (let ((values (alien-values-type-values type)))
    (when (> (length values) 2)
      (error "Too many result values from c-call."))
    (mapcar (lambda (type)
              (invoke-alien-type-method :result-tn type state))
            values)))

(!def-vm-support-routine make-call-out-tns (type)
  (let ((arg-state (make-arg-state)))
    (collect ((arg-tns))
      (dolist (arg-type (alien-fun-type-arg-types type))
        (arg-tns (invoke-alien-type-method :arg-tn arg-type arg-state)))
      (values (my-make-wired-tn 'positive-fixnum 'any-reg esp-offset)
              (* (arg-state-stack-frame-size arg-state) n-word-bytes)
              (arg-tns)
              (invoke-alien-type-method :result-tn
                                        (alien-fun-type-result-type type)
                                        (make-result-state))))))


(deftransform %alien-funcall ((function type &rest args) * * :node node)
  (aver (sb!c::constant-lvar-p type))
  (let* ((type (sb!c::lvar-value type))
         (env (sb!c::node-lexenv node))
         (arg-types (alien-fun-type-arg-types type))
         (result-type (alien-fun-type-result-type type)))
    (aver (= (length arg-types) (length args)))
    (if (or (some #'(lambda (type)
                      (and (alien-integer-type-p type)
                           (> (sb!alien::alien-integer-type-bits type) 64)))
                  arg-types)
            (and (alien-integer-type-p result-type)
                 (> (sb!alien::alien-integer-type-bits result-type) 64)))
        (collect ((new-args) (lambda-vars) (new-arg-types))
          (dolist (type arg-types)
            (let ((arg (gensym)))
              (lambda-vars arg)
              (cond ((and (alien-integer-type-p type)
                          (> (sb!alien::alien-integer-type-bits type) 64))
                     ;; CLH: FIXME! This should really be
                     ;; #xffffffffffffffff. nyef says: "Passing
                     ;; 128-bit integers to ALIEN functions on x86-64
                     ;; believed to be broken."
                     (new-args `(logand ,arg #xffffffff))
                     (new-args `(ash ,arg -64))
                     (new-arg-types (parse-alien-type '(unsigned 64) env))
                     (if (alien-integer-type-signed type)
                         (new-arg-types (parse-alien-type '(signed 64) env))
                         (new-arg-types (parse-alien-type '(unsigned 64) env))))
                    (t
                     (new-args arg)
                     (new-arg-types type)))))
          (cond ((and (alien-integer-type-p result-type)
                      (> (sb!alien::alien-integer-type-bits result-type) 64))
                 (let ((new-result-type
                        (let ((sb!alien::*values-type-okay* t))
                          (parse-alien-type
                           (if (alien-integer-type-signed result-type)
                               '(values (unsigned 64) (signed 64))
                               '(values (unsigned 64) (unsigned 64)))
                           env))))
                   `(lambda (function type ,@(lambda-vars))
                      (declare (ignore type))
                      (multiple-value-bind (low high)
                          (%alien-funcall function
                                          ',(make-alien-fun-type
                                             :arg-types (new-arg-types)
                                             :result-type new-result-type)
                                          ,@(new-args))
                        (logior low (ash high 64))))))
                (t
                 `(lambda (function type ,@(lambda-vars))
                    (declare (ignore type))
                    (%alien-funcall function
                                    ',(make-alien-fun-type
                                       :arg-types (new-arg-types)
                                       :result-type result-type)
                                    ,@(new-args))))))
        (sb!c::give-up-ir1-transform))))

;;; The ABI specifies that signed short/int's are returned as 32-bit
;;; values. Negative values need to be sign-extended to 64-bits (done
;;; in a :NATURALIZE-GEN alien-type-method).
(defknown sign-extend ((signed-byte 32)) fixnum
          (foldable flushable movable))

(define-vop (sign-extend)
  (:translate sign-extend)
  (:policy :fast-safe)
  (:args (val :scs (signed-reg)))
  (:arg-types fixnum)
  (:results (res :scs (signed-reg)))
  (:result-types fixnum)
  (:generator 1
   (inst movsxd res
         (make-random-tn :kind :normal
                         :sc (sc-or-lose 'dword-reg)
                         :offset (tn-offset val)))))

#-sb-xc-host
(defun sign-extend (x)
  (declare (type (signed-byte 32) x))
  (sign-extend x))

#+sb-xc-host
(defun sign-extend (x)
  (if (logbitp 31 x)
      (dpb x (byte 32 0) -1)
      x))

(define-vop (foreign-symbol-sap)
  (:translate foreign-symbol-sap)
  (:policy :fast-safe)
  (:args)
  (:arg-types (:constant simple-string))
  (:info foreign-symbol)
  (:results (res :scs (sap-reg)))
  (:result-types system-area-pointer)
  (:generator 2
   (inst lea res (make-fixup foreign-symbol :foreign))))

#!+linkage-table
(define-vop (foreign-symbol-dataref-sap)
  (:translate foreign-symbol-dataref-sap)
  (:policy :fast-safe)
  (:args)
  (:arg-types (:constant simple-string))
  (:info foreign-symbol)
  (:results (res :scs (sap-reg)))
  (:result-types system-area-pointer)
  (:generator 2
   (inst mov res (make-fixup foreign-symbol :foreign-dataref))))

(define-vop (call-out)
  (:args (function :scs (sap-reg))