(inst fstp ,tn)
,@body
(unless (zerop (tn-offset ,tn))
- (inst fxch ,tn)))) ; save into new dest and restore st(0)
+ (inst fxch ,tn)))) ; save into new dest and restore st(0)
\f
;;;; instruction-like macros
#!+sb-doc
"Move SRC into DST unless they are location=."
(once-only ((n-dst dst)
- (n-src src))
+ (n-src src))
`(unless (location= ,n-dst ,n-src)
(inst mov ,n-dst ,n-src))))
(defmacro load-symbol (reg symbol)
`(inst mov ,reg (+ nil-value (static-symbol-offset ,symbol))))
+(defmacro make-ea-for-symbol-value (symbol)
+ `(make-ea :dword
+ :disp (+ nil-value
+ (static-symbol-offset ',symbol)
+ (ash symbol-value-slot word-shift)
+ (- other-pointer-lowtag))))
+
(defmacro load-symbol-value (reg symbol)
- `(inst mov ,reg
- (make-ea :dword
- :disp (+ nil-value
- (static-symbol-offset ',symbol)
- (ash symbol-value-slot word-shift)
- (- other-pointer-lowtag)))))
+ `(inst mov ,reg (make-ea-for-symbol-value ,symbol)))
(defmacro store-symbol-value (reg symbol)
- `(inst mov
- (make-ea :dword
- :disp (+ nil-value
- (static-symbol-offset ',symbol)
- (ash symbol-value-slot word-shift)
- (- other-pointer-lowtag)))
- ,reg))
+ `(inst mov (make-ea-for-symbol-value ,symbol) ,reg))
+
+#!+sb-thread
+(defmacro make-ea-for-symbol-tls-index (symbol)
+ `(make-ea :dword
+ :disp (+ nil-value
+ (static-symbol-offset ',symbol)
+ (ash symbol-tls-index-slot word-shift)
+ (- other-pointer-lowtag))))
#!+sb-thread
(defmacro load-tl-symbol-value (reg symbol)
`(progn
- (inst mov ,reg
- (make-ea :dword
- :disp (+ nil-value
- (static-symbol-offset ',symbol)
- (ash symbol-tls-index-slot word-shift)
- (- other-pointer-lowtag))))
+ (inst mov ,reg (make-ea-for-symbol-tls-index ,symbol))
(inst fs-segment-prefix)
(inst mov ,reg (make-ea :dword :scale 1 :index ,reg))))
#!-sb-thread
#!+sb-thread
(defmacro store-tl-symbol-value (reg symbol temp)
`(progn
- (inst mov ,temp
- (make-ea :dword
- :disp (+ nil-value
- (static-symbol-offset ',symbol)
- (ash symbol-tls-index-slot word-shift)
- (- other-pointer-lowtag))))
+ (inst mov ,temp (make-ea-for-symbol-tls-index ,symbol))
(inst fs-segment-prefix)
(inst mov (make-ea :dword :scale 1 :index ,temp) ,reg)))
#!-sb-thread
(defmacro store-tl-symbol-value (reg symbol temp)
(declare (ignore temp))
`(store-symbol-value ,reg ,symbol))
-
+
+(defmacro load-binding-stack-pointer (reg)
+ #!+sb-thread
+ `(progn
+ (inst fs-segment-prefix)
+ (inst mov ,reg (make-ea :dword
+ :disp (* 4 thread-binding-stack-pointer-slot))))
+ #!-sb-thread
+ `(load-symbol-value ,reg *binding-stack-pointer*))
+
+(defmacro store-binding-stack-pointer (reg)
+ #!+sb-thread
+ `(progn
+ (inst fs-segment-prefix)
+ (inst mov (make-ea :dword
+ :disp (* 4 thread-binding-stack-pointer-slot))
+ ,reg))
+ #!-sb-thread
+ `(store-symbol-value ,reg *binding-stack-pointer*))
+
(defmacro load-type (target source &optional (offset 0))
#!+sb-doc
"Loads the type bits of a pointer into target independent of
byte-ordering issues."
(once-only ((n-target target)
- (n-source source)
- (n-offset offset))
+ (n-source source)
+ (n-offset offset))
(ecase *backend-byte-order*
(:little-endian
`(inst mov ,n-target
- (make-ea :byte :base ,n-source :disp ,n-offset)))
+ (make-ea :byte :base ,n-source :disp ,n-offset)))
(:big-endian
`(inst mov ,n-target
- (make-ea :byte :base ,n-source :disp (+ ,n-offset 3)))))))
+ (make-ea :byte :base ,n-source :disp (+ ,n-offset 3)))))))
\f
;;;; allocation helpers
-;;; All allocation is done by calls to assembler routines that
-;;; eventually invoke the C alloc() function. Once upon a time
-;;; (before threads) allocation within an alloc_region could also be
-;;; done inline, with the aid of two C symbols storing the current
-;;; allocation region boundaries; however, C cymbols are global.
+;;; Allocation within alloc_region (which is thread local) can be done
+;;; inline. If the alloc_region is overflown allocation is done by
+;;; calling the C alloc() function.
;;; C calls for allocation don't /seem/ to make an awful lot of
-;;; difference to speed. Guessing from historical context, it looks
-;;; like inline allocation was introduced before pseudo-atomic, at
-;;; which time all calls to alloc() would have needed a syscall to
-;;; mask signals for the duration. Now we have pseudoatomic there's
-;;; no need for that overhead. Still, inline alloc would be a neat
-;;; addition someday
+;;; difference to speed. On pure consing it's about a 25%
+;;; gain. Guessing from historical context, it looks like inline
+;;; allocation was introduced before pseudo-atomic, at which time all
+;;; calls to alloc() would have needed a syscall to mask signals for
+;;; the duration. Now we have pseudoatomic there's no need for that
+;;; overhead.
+
+(defun allocation-dynamic-extent (alloc-tn size)
+ (inst sub esp-tn size)
+ ;; FIXME: SIZE _should_ be double-word aligned (suggested but
+ ;; unfortunately not enforced by PAD-DATA-BLOCK and
+ ;; WITH-FIXED-ALLOCATION), so that ESP is always divisible by 8 (for
+ ;; 32-bit lispobjs). In that case, this AND instruction is
+ ;; unneccessary and could be removed. If not, explain why. -- CSR,
+ ;; 2004-03-30
+ (inst and esp-tn #.(ldb (byte 32 0) (lognot lowtag-mask)))
+ (aver (not (location= alloc-tn esp-tn)))
+ (inst mov alloc-tn esp-tn)
+ (values))
+
+(defun allocation-notinline (alloc-tn size)
+ (let* ((alloc-tn-offset (tn-offset alloc-tn))
+ ;; C call to allocate via dispatch routines. Each
+ ;; destination has a special entry point. The size may be a
+ ;; register or a constant.
+ (tn-text (ecase alloc-tn-offset
+ (#.eax-offset "eax")
+ (#.ecx-offset "ecx")
+ (#.edx-offset "edx")
+ (#.ebx-offset "ebx")
+ (#.esi-offset "esi")
+ (#.edi-offset "edi")))
+ (size-text (case size (8 "8_") (16 "16_") (t ""))))
+ (unless (or (eql size 8) (eql size 16))
+ (unless (and (tn-p size) (location= alloc-tn size))
+ (inst mov alloc-tn size)))
+ (inst call (make-fixup (concatenate 'string
+ "alloc_" size-text
+ "to_" tn-text)
+ :foreign))))
+
+(defun allocation-inline (alloc-tn size)
+ (let ((ok (gen-label))
+ (done (gen-label))
+ (free-pointer
+ (make-ea :dword :disp
+ #!+sb-thread (* n-word-bytes thread-alloc-region-slot)
+ #!-sb-thread (make-fixup "boxed_region" :foreign)
+ :scale 1)) ; thread->alloc_region.free_pointer
+ (end-addr
+ (make-ea :dword :disp
+ #!+sb-thread (* n-word-bytes (1+ thread-alloc-region-slot))
+ #!-sb-thread (make-fixup "boxed_region" :foreign 4)
+ :scale 1))) ; thread->alloc_region.end_addr
+ (unless (and (tn-p size) (location= alloc-tn size))
+ (inst mov alloc-tn size))
+ #!+sb-thread (inst fs-segment-prefix)
+ (inst add alloc-tn free-pointer)
+ #!+sb-thread (inst fs-segment-prefix)
+ (inst cmp alloc-tn end-addr)
+ (inst jmp :be ok)
+ (let ((dst (ecase (tn-offset alloc-tn)
+ (#.eax-offset "alloc_overflow_eax")
+ (#.ecx-offset "alloc_overflow_ecx")
+ (#.edx-offset "alloc_overflow_edx")
+ (#.ebx-offset "alloc_overflow_ebx")
+ (#.esi-offset "alloc_overflow_esi")
+ (#.edi-offset "alloc_overflow_edi"))))
+ (inst call (make-fixup dst :foreign)))
+ (inst jmp-short done)
+ (emit-label ok)
+ ;; Swap ALLOC-TN and FREE-POINTER
+ (cond ((and (tn-p size) (location= alloc-tn size))
+ ;; XCHG is extremely slow, use the xor swap trick
+ #!+sb-thread (inst fs-segment-prefix)
+ (inst xor alloc-tn free-pointer)
+ #!+sb-thread (inst fs-segment-prefix)
+ (inst xor free-pointer alloc-tn)
+ #!+sb-thread (inst fs-segment-prefix)
+ (inst xor alloc-tn free-pointer))
+ (t
+ ;; It's easier if SIZE is still available.
+ #!+sb-thread (inst fs-segment-prefix)
+ (inst mov free-pointer alloc-tn)
+ (inst sub alloc-tn size)))
+ (emit-label done))
+ (values))
-(defvar *maybe-use-inline-allocation* t) ; FIXME unused
;;; Emit code to allocate an object with a size in bytes given by
-;;; Size. The size may be an integer of a TN. If Inline is a VOP
+;;; SIZE. The size may be an integer or a TN. If Inline is a VOP
;;; node-var then it is used to make an appropriate speed vs size
;;; decision.
-;;; This macro should only be used inside a pseudo-atomic section,
-;;; which should also cover subsequent initialization of the
-;;; object.
-(defun allocation (alloc-tn size &optional inline)
- ;; FIXME: since it appears that inline allocation is gone, we should
- ;; remove the INLINE parameter and *MAYBE-USE-INLINE-ALLOCATION*
- (declare (ignore inline))
- (flet ((load-size (dst-tn size)
- (unless (and (tn-p size) (location= alloc-tn size))
- (inst mov dst-tn size))))
- (let ((alloc-tn-offset (tn-offset alloc-tn)))
- ;; C call to allocate via dispatch routines. Each
- ;; destination has a special entry point. The size may be a
- ;; register or a constant.
- (ecase alloc-tn-offset
- (#.eax-offset
- (case size
- (8 (inst call (make-fixup (extern-alien-name "alloc_8_to_eax")
- :foreign)))
- (16 (inst call (make-fixup (extern-alien-name "alloc_16_to_eax")
- :foreign)))
- (t
- (load-size eax-tn size)
- (inst call (make-fixup (extern-alien-name "alloc_to_eax")
- :foreign)))))
- (#.ecx-offset
- (case size
- (8 (inst call (make-fixup (extern-alien-name "alloc_8_to_ecx")
- :foreign)))
- (16 (inst call (make-fixup (extern-alien-name "alloc_16_to_ecx")
- :foreign)))
- (t
- (load-size ecx-tn size)
- (inst call (make-fixup (extern-alien-name "alloc_to_ecx")
- :foreign)))))
- (#.edx-offset
- (case size
- (8 (inst call (make-fixup (extern-alien-name "alloc_8_to_edx")
- :foreign)))
- (16 (inst call (make-fixup (extern-alien-name "alloc_16_to_edx")
- :foreign)))
- (t
- (load-size edx-tn size)
- (inst call (make-fixup (extern-alien-name "alloc_to_edx")
- :foreign)))))
- (#.ebx-offset
- (case size
- (8 (inst call (make-fixup (extern-alien-name "alloc_8_to_ebx")
- :foreign)))
- (16 (inst call (make-fixup (extern-alien-name "alloc_16_to_ebx")
- :foreign)))
- (t
- (load-size ebx-tn size)
- (inst call (make-fixup (extern-alien-name "alloc_to_ebx")
- :foreign)))))
- (#.esi-offset
- (case size
- (8 (inst call (make-fixup (extern-alien-name "alloc_8_to_esi")
- :foreign)))
- (16 (inst call (make-fixup (extern-alien-name "alloc_16_to_esi")
- :foreign)))
- (t
- (load-size esi-tn size)
- (inst call (make-fixup (extern-alien-name "alloc_to_esi")
- :foreign)))))
- (#.edi-offset
- (case size
- (8 (inst call (make-fixup (extern-alien-name "alloc_8_to_edi")
- :foreign)))
- (16 (inst call (make-fixup (extern-alien-name "alloc_16_to_edi")
- :foreign)))
- (t
- (load-size edi-tn size)
- (inst call (make-fixup (extern-alien-name "alloc_to_edi")
- :foreign))))))))
+;;; Allocation should only be used inside a pseudo-atomic section, which
+;;; should also cover subsequent initialization of the object.
+
+;;; (FIXME: so why aren't we asserting this?)
+
+(defun allocation (alloc-tn size &optional inline dynamic-extent)
+ (cond
+ (dynamic-extent (allocation-dynamic-extent alloc-tn size))
+ ((or (null inline) (policy inline (>= speed space)))
+ (allocation-inline alloc-tn size))
+ (t (allocation-notinline alloc-tn size)))
(values))
;;; Allocate an other-pointer object of fixed SIZE with a single word
;;; header having the specified WIDETAG value. The result is placed in
;;; RESULT-TN.
(defmacro with-fixed-allocation ((result-tn widetag size &optional inline)
- &rest forms)
- `(pseudo-atomic
- (allocation ,result-tn (pad-data-block ,size) ,inline)
- (storew (logior (ash (1- ,size) n-widetag-bits) ,widetag)
- ,result-tn)
- (inst lea ,result-tn
- (make-ea :byte :base ,result-tn :disp other-pointer-lowtag))
- ,@forms))
+ &body forms)
+ (unless forms
+ (bug "empty &body in WITH-FIXED-ALLOCATION"))
+ (once-only ((result-tn result-tn) (size size))
+ `(pseudo-atomic
+ (allocation ,result-tn (pad-data-block ,size) ,inline)
+ (storew (logior (ash (1- ,size) n-widetag-bits) ,widetag)
+ ,result-tn)
+ (inst lea ,result-tn
+ (make-ea :byte :base ,result-tn :disp other-pointer-lowtag))
+ ,@forms)))
\f
;;;; error code
(eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute)
(defun emit-error-break (vop kind code values)
(let ((vector (gensym)))
- `((inst int 3) ; i386 breakpoint instruction
- ;; The return PC points here; note the location for the debugger.
- (let ((vop ,vop))
- (when vop
- (note-this-location vop :internal-error)))
- (inst byte ,kind) ; eg trap_Xyyy
- (with-adjustable-vector (,vector) ; interr arguments
- (write-var-integer (error-number-or-lose ',code) ,vector)
- ,@(mapcar (lambda (tn)
- `(let ((tn ,tn))
- ;; classic CMU CL comment:
- ;; zzzzz jrd here. tn-offset is zero for constant
- ;; tns.
- (write-var-integer (make-sc-offset (sc-number
- (tn-sc tn))
- (or (tn-offset tn)
- 0))
- ,vector)))
- values)
- (inst byte (length ,vector))
- (dotimes (i (length ,vector))
- (inst byte (aref ,vector i))))))))
+ `((progn
+ #-darwin (inst int 3) ; i386 breakpoint instruction
+ ;; CLH 20060314
+ ;; On Darwin, we need to use #x0b0f instead of int3 in order
+ ;; to generate a SIGILL instead of a SIGTRAP as darwin/x86
+ ;; doesn't seem to be reliably firing SIGTRAP
+ ;; handlers. Hopefully this will be fixed by Apple at a
+ ;; later date.
+ #+darwin (inst word #x0b0f))
+ ;; The return PC points here; note the location for the debugger.
+ (let ((vop ,vop))
+ (when vop
+ (note-this-location vop :internal-error)))
+ (inst byte ,kind) ; eg trap_Xyyy
+ (with-adjustable-vector (,vector) ; interr arguments
+ (write-var-integer (error-number-or-lose ',code) ,vector)
+ ,@(mapcar (lambda (tn)
+ `(let ((tn ,tn))
+ ;; classic CMU CL comment:
+ ;; zzzzz jrd here. tn-offset is zero for constant
+ ;; tns.
+ (write-var-integer (make-sc-offset (sc-number
+ (tn-sc tn))
+ (or (tn-offset tn)
+ 0))
+ ,vector)))
+ values)
+ (inst byte (length ,vector))
+ (dotimes (i (length ,vector))
+ (inst byte (aref ,vector i))))))))
(defmacro error-call (vop error-code &rest values)
#!+sb-doc
"Cause an error. ERROR-CODE is the error to cause."
(cons 'progn
- (emit-error-break vop error-trap error-code values)))
+ (emit-error-break vop error-trap error-code values)))
(defmacro generate-error-code (vop error-code &rest values)
#!+sb-doc
;;; around. It's an operation which the AOP weenies would describe as
;;; having "cross-cutting concerns", meaning it appears all over the
;;; place and there's no logical single place to attach documentation.
-;;; grep (mostly in src/runtime) is your friend
+;;; grep (mostly in src/runtime) is your friend
;;; FIXME: *PSEUDO-ATOMIC-FOO* could be made into *PSEUDO-ATOMIC-BITS*,
;;; set with a single operation and cleared with SHR *PSEUDO-ATOMIC-BITS*,-2;
;;; the ATOMIC bit is bit 0, the INTERRUPTED bit is bit 1, and you check
;;; the C flag after the shift to see whether you were interrupted.
+;;;
+;;; KLUDGE: since the stack on the x86 is treated conservatively, it
+;;; does not matter whether a signal occurs during construction of a
+;;; dynamic-extent object, as the half-finished construction of the
+;;; object will not cause any difficulty. We can therefore elide
+(defmacro maybe-pseudo-atomic (really-p &body forms)
+ `(if ,really-p
+ (progn ,@forms)
+ (pseudo-atomic ,@forms)))
#!+sb-thread
(defmacro pseudo-atomic (&rest forms)
(with-unique-names (label)
`(let ((,label (gen-label)))
- (inst fs-segment-prefix)
- (inst mov (make-ea :byte :disp (* 4 thread-pseudo-atomic-atomic-slot)) 1)
- (inst fs-segment-prefix)
- (inst mov (make-ea :byte
- :disp (* 4 thread-pseudo-atomic-interrupted-slot)) 0)
- ,@forms
- (inst fs-segment-prefix)
- (inst mov (make-ea :byte :disp (* 4 thread-pseudo-atomic-atomic-slot)) 0)
- (inst fs-segment-prefix)
- (inst cmp (make-ea :byte
- :disp (* 4 thread-pseudo-atomic-interrupted-slot)) 0)
- (inst jmp :eq ,label)
- ;; if PAI was set, interrupts were disabled at the same time
- ;; using the process signal mask.
- (inst break pending-interrupt-trap)
- (emit-label ,label))))
+ (inst fs-segment-prefix)
+ (inst mov (make-ea :byte :disp (* 4 thread-pseudo-atomic-atomic-slot))
+ (fixnumize 1))
+ ,@forms
+ (inst fs-segment-prefix)
+ (inst mov (make-ea :byte :disp (* 4 thread-pseudo-atomic-atomic-slot)) 0)
+ (inst fs-segment-prefix)
+ (inst cmp (make-ea :byte
+ :disp (* 4 thread-pseudo-atomic-interrupted-slot)) 0)
+ (inst jmp :eq ,label)
+ ;; if PAI was set, interrupts were disabled at the same
+ ;; time using the process signal mask.
+ (inst break pending-interrupt-trap)
+ (emit-label ,label))))
#!-sb-thread
(defmacro pseudo-atomic (&rest forms)
(with-unique-names (label)
`(let ((,label (gen-label)))
- ;; FIXME: The MAKE-EA noise should become a MACROLET macro or
- ;; something. (perhaps SVLB, for static variable low byte)
- (inst mov (make-ea :byte :disp (+ nil-value
- (static-symbol-offset
- '*pseudo-atomic-interrupted*)
- (ash symbol-value-slot word-shift)
- ;; FIXME: Use mask, not minus, to
- ;; take out type bits.
- (- other-pointer-lowtag)))
- 0)
- (inst mov (make-ea :byte :disp (+ nil-value
- (static-symbol-offset
- '*pseudo-atomic-atomic*)
- (ash symbol-value-slot word-shift)
- (- other-pointer-lowtag)))
- (fixnumize 1))
- ,@forms
- (inst mov (make-ea :byte :disp (+ nil-value
- (static-symbol-offset
- '*pseudo-atomic-atomic*)
- (ash symbol-value-slot word-shift)
- (- other-pointer-lowtag)))
- 0)
- ;; KLUDGE: Is there any requirement for interrupts to be
- ;; handled in order? It seems as though an interrupt coming
- ;; in at this point will be executed before any pending interrupts.
- ;; Or do incoming interrupts check to see whether any interrupts
- ;; are pending? I wish I could find the documentation for
- ;; pseudo-atomics.. -- WHN 19991130
- (inst cmp (make-ea :byte
- :disp (+ nil-value
- (static-symbol-offset
- '*pseudo-atomic-interrupted*)
- (ash symbol-value-slot word-shift)
- (- other-pointer-lowtag)))
- 0)
- (inst jmp :eq ,label)
- ;; if PAI was set, interrupts were disabled at the same time
- ;; using the process signal mask.
- (inst break pending-interrupt-trap)
- (emit-label ,label))))
-
-
+ ;; FIXME: The MAKE-EA noise should become a MACROLET macro
+ ;; or something. (perhaps SVLB, for static variable low
+ ;; byte)
+ (inst mov (make-ea :byte :disp (+ nil-value
+ (static-symbol-offset
+ '*pseudo-atomic-atomic*)
+ (ash symbol-value-slot word-shift)
+ (- other-pointer-lowtag)))
+ (fixnumize 1))
+ ,@forms
+ (inst mov (make-ea :byte :disp (+ nil-value
+ (static-symbol-offset
+ '*pseudo-atomic-atomic*)
+ (ash symbol-value-slot word-shift)
+ (- other-pointer-lowtag)))
+ 0)
+ (inst cmp (make-ea :byte
+ :disp (+ nil-value
+ (static-symbol-offset
+ '*pseudo-atomic-interrupted*)
+ (ash symbol-value-slot word-shift)
+ (- other-pointer-lowtag)))
+ 0)
+ (inst jmp :eq ,label)
+ ;; if PAI was set, interrupts were disabled at the same
+ ;; time using the process signal mask.
+ (inst break pending-interrupt-trap)
+ (emit-label ,label))))
\f
;;;; indexed references
`(progn
(define-vop (,name)
,@(when translate
- `((:translate ,translate)))
+ `((:translate ,translate)))
(:policy :fast-safe)
(:args (object :scs (descriptor-reg))
- (index :scs (any-reg)))
+ (index :scs (any-reg immediate)))
(:arg-types ,type tagged-num)
(:results (value :scs ,scs))
(:result-types ,el-type)
- (:generator 3 ; pw was 5
- (inst mov value (make-ea :dword :base object :index index
- :disp (- (* ,offset n-word-bytes)
- ,lowtag)))))
- (define-vop (,(symbolicate name "-C"))
- ,@(when translate
- `((:translate ,translate)))
- (:policy :fast-safe)
- (:args (object :scs (descriptor-reg)))
- (:info index)
- (:arg-types ,type (:constant (signed-byte 30)))
- (:results (value :scs ,scs))
- (:result-types ,el-type)
- (:generator 2 ; pw was 5
- (inst mov value (make-ea :dword :base object
- :disp (- (* (+ ,offset index) n-word-bytes)
- ,lowtag)))))))
+ (:generator 3 ; pw was 5
+ (sc-case index
+ (immediate
+ (inst mov value (make-ea :dword :base object
+ :disp (- (* (+ ,offset (tn-value index))
+ n-word-bytes)
+ ,lowtag))))
+ (t
+ (inst mov value (make-ea :dword :base object :index index
+ :disp (- (* ,offset n-word-bytes)
+ ,lowtag)))))))))
(defmacro define-full-setter (name type offset lowtag scs el-type &optional translate)
`(progn
(define-vop (,name)
,@(when translate
- `((:translate ,translate)))
+ `((:translate ,translate)))
(:policy :fast-safe)
(:args (object :scs (descriptor-reg))
- (index :scs (any-reg))
- (value :scs ,scs :target result))
+ (index :scs (any-reg immediate))
+ (value :scs ,scs :target result))
(:arg-types ,type tagged-num ,el-type)
(:results (result :scs ,scs))
(:result-types ,el-type)
- (:generator 4 ; was 5
- (inst mov (make-ea :dword :base object :index index
- :disp (- (* ,offset n-word-bytes) ,lowtag))
- value)
- (move result value)))
- (define-vop (,(symbolicate name "-C"))
- ,@(when translate
- `((:translate ,translate)))
- (:policy :fast-safe)
- (:args (object :scs (descriptor-reg))
- (value :scs ,scs :target result))
- (:info index)
- (:arg-types ,type (:constant (signed-byte 30)) ,el-type)
- (:results (result :scs ,scs))
- (:result-types ,el-type)
- (:generator 3 ; was 5
- (inst mov (make-ea :dword :base object
- :disp (- (* (+ ,offset index) n-word-bytes)
- ,lowtag))
- value)
- (move result value)))))
-
-;;; helper for alien stuff
-(defmacro sb!sys::with-pinned-objects ((&rest objects) &body body)
+ (:generator 4 ; was 5
+ (sc-case index
+ (immediate
+ (inst mov (make-ea :dword :base object
+ :disp (- (* (+ ,offset (tn-value index))
+ n-word-bytes)
+ ,lowtag))
+ value))
+ (t
+ (inst mov (make-ea :dword :base object :index index
+ :disp (- (* ,offset n-word-bytes) ,lowtag))
+ value)))
+ (move result value)))))
+
+;;; helper for alien stuff.
+(defmacro with-pinned-objects ((&rest objects) &body body)
"Arrange with the garbage collector that the pages occupied by
OBJECTS will not be moved in memory for the duration of BODY.
Useful for e.g. foreign calls where another thread may trigger
garbage collection"
`(multiple-value-prog1
(progn
- ,@(loop for p in objects
- collect `(push-word-on-c-stack
- (int-sap (sb!kernel:get-lisp-obj-address ,p))))
- ,@body)
+ ,@(loop for p in objects
+ collect
+ ;; There is no race here wrt to gc, because at every
+ ;; point during the execution there is a reference to
+ ;; P on the stack or in a register.
+ `(push-word-on-c-stack
+ (int-sap (sb!kernel:get-lisp-obj-address ,p))))
+ ,@body)
+ ;; If the body returned normally, we should restore the stack pointer
+ ;; for the benefit of any following code in the same function. If
+ ;; there's a non-local exit in the body, sp is garbage anyway and
+ ;; will get set appropriately from {a, the} frame pointer before it's
+ ;; next needed
(pop-words-from-c-stack ,(length objects))))
projects / sbcl.git / blobdiff