vm.lisp

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  ;; non-descriptor registers, because of the conservative GC.
  ;; Therefore, we use different scs only to distinguish between
  ;; descriptor and non-descriptor values and to specify size.

  ;; immediate descriptor objects. Don't have to be seen by GC, but nothing
  ;; bad will happen if they are. (fixnums, characters, header values, etc).
  (any-reg registers
           :locations #.*qword-regs*
           :element-size 2 ; I think this is for the al/ah overlap thing
           :constant-scs (immediate)
           :save-p t
           :alternate-scs (control-stack))

  ;; pointer descriptor objects -- must be seen by GC
  (descriptor-reg registers
                  :locations #.*qword-regs*
                  :element-size 2
;                 :reserve-locations (#.eax-offset)
                  :constant-scs (constant immediate)
                  :save-p t
                  :alternate-scs (control-stack))

  ;; non-descriptor characters
  (character-reg registers
                 :locations #!-sb-unicode #.*byte-regs*
                            #!+sb-unicode #.*qword-regs*
                 #!+sb-unicode #!+sb-unicode
                 :element-size 2
                 #!-sb-unicode #!-sb-unicode
                 :reserve-locations (#.al-offset)
                 :constant-scs (immediate)
                 :save-p t
                 :alternate-scs (character-stack))

  ;; non-descriptor SAPs (arbitrary pointers into address space)
  (sap-reg registers
           :locations #.*qword-regs*
           :element-size 2
;          :reserve-locations (#.eax-offset)
           :constant-scs (immediate)
           :save-p t
           :alternate-scs (sap-stack))

  ;; non-descriptor (signed or unsigned) numbers
  (signed-reg registers
              :locations #.*qword-regs*
              :element-size 2
              :constant-scs (immediate)
              :save-p t
              :alternate-scs (signed-stack))
  (unsigned-reg registers
                :locations #.*qword-regs*
                :element-size 2
                :constant-scs (immediate)
                :save-p t
                :alternate-scs (unsigned-stack))

  ;; miscellaneous objects that must not be seen by GC. Used only as
  ;; temporaries.
  (word-reg registers
            :locations #.*word-regs*
            :element-size 2
            )
  (dword-reg registers
            :locations #.*dword-regs*
            :element-size 2
            )
  (byte-reg registers
            :locations #.*byte-regs*
            )

  ;; that can go in the floating point registers

  ;; non-descriptor SINGLE-FLOATs
  (single-reg float-registers
              :locations #.(loop for i from 0 below 15 collect i)
              :constant-scs (fp-single-zero)
              :save-p t
              :alternate-scs (single-stack))

  ;; non-descriptor DOUBLE-FLOATs
  (double-reg float-registers
              :locations #.(loop for i from 0 below 15 collect i)
              :constant-scs (fp-double-zero)
              :save-p t
              :alternate-scs (double-stack))

  (complex-single-reg float-registers
                      :locations #.(loop for i from 0 to 14 by 2 collect i)
                      :element-size 2
                      :constant-scs ()
                      :save-p t
                      :alternate-scs (complex-single-stack))

  (complex-double-reg float-registers
                      :locations #.(loop for i from 0 to 14 by 2 collect i)
                      :element-size 2
                      :constant-scs ()
                      :save-p t
                      :alternate-scs (complex-double-stack))

  ;; a catch or unwind block
  (catch-block stack :element-size kludge-nondeterministic-catch-block-size))

(eval-when (:compile-toplevel :load-toplevel :execute)
(defparameter *byte-sc-names*
  '(#!-sb-unicode character-reg byte-reg #!-sb-unicode character-stack))
(defparameter *word-sc-names* '(word-reg))
(defparameter *dword-sc-names* '(dword-reg))
(defparameter *qword-sc-names*
  '(any-reg descriptor-reg sap-reg signed-reg unsigned-reg control-stack
    signed-stack unsigned-stack sap-stack single-stack
    #!+sb-unicode character-reg #!+sb-unicode character-stack constant))
;;; added by jrd. I guess the right thing to do is to treat floats
;;; as a separate size...
;;;
;;; These are used to (at least) determine operand size.
(defparameter *float-sc-names* '(single-reg))
(defparameter *double-sc-names* '(double-reg double-stack))
) ; EVAL-WHEN

;;;; miscellaneous TNs for the various registers

(macrolet ((def-misc-reg-tns (sc-name &rest reg-names)
             (collect ((forms))
                      (dolist (reg-name reg-names)
                        (let ((tn-name (symbolicate reg-name "-TN"))
                              (offset-name (symbolicate reg-name "-OFFSET")))
                          ;; FIXME: It'd be good to have the special
                          ;; variables here be named with the *FOO*
                          ;; convention.
                          (forms `(defparameter ,tn-name
                                    (make-random-tn :kind :normal
                                                    :sc (sc-or-lose ',sc-name)
                                                    :offset
                                                    ,offset-name)))))
                      `(progn ,@(forms)))))

  (def-misc-reg-tns unsigned-reg rax rbx rcx rdx rbp rsp rdi rsi
                    r8 r9 r10 r11 r12 r13 r14 r15)
  (def-misc-reg-tns dword-reg eax ebx ecx edx ebp esp edi esi)
  (def-misc-reg-tns word-reg ax bx cx dx bp sp di si)
  (def-misc-reg-tns byte-reg al cl dl bl sil dil r8b r9b r10b
                    r11b r12b r13b r14b r15b)
  (def-misc-reg-tns single-reg
      float0 float1 float2 float3 float4 float5 float6 float7
      float8 float9 float10 float11 float12 float13 float14 float15))

;; A register that's never used by the code generator, and can therefore
;; be used as an assembly temporary in cases where a VOP :TEMPORARY can't
;; be used.
(defparameter temp-reg-tn r11-tn)

;;; TNs for registers used to pass arguments
(defparameter *register-arg-tns*
  (mapcar (lambda (register-arg-name)
            (symbol-value (symbolicate register-arg-name "-TN")))
          *register-arg-names*))

(defparameter thread-base-tn
  (make-random-tn :kind :normal :sc (sc-or-lose 'unsigned-reg )
                  :offset r12-offset))

(defparameter fp-single-zero-tn
  (make-random-tn :kind :normal
                  :sc (sc-or-lose 'single-reg)
                  :offset 15))

(defparameter fp-double-zero-tn
  (make-random-tn :kind :normal
                  :sc (sc-or-lose 'double-reg)
                  :offset 15))

;;; If value can be represented as an immediate constant, then return
;;; the appropriate SC number, otherwise return NIL.
(!def-vm-support-routine immediate-constant-sc (value)
  (typecase value
    ((or (integer #.sb!xc:most-negative-fixnum #.sb!xc:most-positive-fixnum)
         character)
     (sc-number-or-lose 'immediate))
    (symbol
     (when (static-symbol-p value)
       (sc-number-or-lose 'immediate)))
    (single-float
     (if (eql value 0f0)
         (sc-number-or-lose 'fp-single-zero )
         nil))
    (double-float
     (if (eql value 0d0)
         (sc-number-or-lose 'fp-double-zero )
         nil))))


;;;; miscellaneous function call parameters

;;; offsets of special stack frame locations
(def!constant ocfp-save-offset 0)
(def!constant return-pc-save-offset 1)
(def!constant code-save-offset 2)

(def!constant lra-save-offset return-pc-save-offset) ; ?

;;; This is used by the debugger.
(def!constant single-value-return-byte-offset 3)

;;; This function is called by debug output routines that want a pretty name
;;; for a TN's location. It returns a thing that can be printed with PRINC.
(!def-vm-support-routine location-print-name (tn)
  (declare (type tn tn))
  (let* ((sc (tn-sc tn))
         (sb (sb-name (sc-sb sc)))
         (offset (tn-offset tn)))
    (ecase sb
      (registers
       (let* ((sc-name (sc-name sc))
              (name-vec (cond ((member sc-name *byte-sc-names*)
                               *byte-register-names*)
                              ((member sc-name *word-sc-names*)
                               *word-register-names*)
                              ((member sc-name *dword-sc-names*)
                               *dword-register-names*)
                              ((member sc-name *qword-sc-names*)
                               *qword-register-names*))))
         (or (and name-vec
                  (< -1 offset (length name-vec))
                  (svref name-vec offset))
             ;; FIXME: Shouldn't this be an ERROR?
             (format nil "<unknown reg: off=~W, sc=~A>" offset sc-name))))
      (float-registers (format nil "FLOAT~D" offset))
      (stack (format nil "S~D" offset))
      (constant (format nil "Const~D" offset))
      (immediate-constant "Immed")
      (noise (symbol-name (sc-name sc))))))
;;; FIXME: Could this, and everything that uses it, be made #!+SB-SHOW?

(defun dwords-for-quad (value)
  (let* ((lo (logand value (1- (ash 1 32))))
         (hi (ash value -32)))
    (values lo hi)))

(defun words-for-dword (value)
  (let* ((lo (logand value (1- (ash 1 16))))
         (hi (ash value -16)))
    (values lo hi)))

(def!constant cfp-offset rbp-offset) ; pfw - needed by stuff in /code

(!def-vm-support-routine combination-implementation-style (node)
  (declare (type sb!c::combination node) (ignore node))
  (values :default nil))