-;;;
-;;; **********************************************************************
-;;; This code was written as part of the CMU Common Lisp project at
-;;; Carnegie Mellon University, and has been placed in the public domain.
-;;;
-
-;;;
-;;; **********************************************************************
-;;;
-;;; This file contains the VM definition of function call for the Alpha.
-;;;
-;;; Written by Rob MacLachlan
-;;;
-;;; Converted for the Alpha by Sean Hallgren
-;;;
-(in-package "SB!VM")
+;;;; the VM definition of function call for the Alpha
+;;;; 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")
\f
-;;;; Interfaces to IR2 conversion:
+;;;; interfaces to IR2 conversion
-;;; Standard-Argument-Location -- Interface
-;;;
-;;; Return a wired TN describing the N'th full call argument passing
+;;; Return a wired TN describing the N'th full call argument passing
;;; location.
;;;
(!def-vm-support-routine standard-argument-location (n)
control-stack-arg-scn n)))
-;;; Make-Return-PC-Passing-Location -- Interface
-;;;
-;;; Make a passing location TN for a local call return PC. If standard is
-;;; true, then use the standard (full call) location, otherwise use any legal
-;;; location. Even in the non-standard case, this may be restricted by a
-;;; desire to use a subroutine call instruction.
+;;; Make a passing location TN for a local call return PC. If standard
+;;; is true, then use the standard (full call) location, otherwise use
+;;; any legal location. Even in the non-standard case, this may be
+;;; restricted by a desire to use a subroutine call instruction.
;;;
(!def-vm-support-routine make-return-pc-passing-location (standard)
#!+gengc (declare (ignore standard))
#!+gengc
(make-wired-tn *fixnum-primitive-type* immediate-arg-scn ra-offset))
-;;; Make-Old-FP-Passing-Location -- Interface
-;;;
-;;; Similar to Make-Return-PC-Passing-Location, but makes a location to pass
-;;; Old-FP in. This is (obviously) wired in the standard convention, but is
-;;; totally unrestricted in non-standard conventions, since we can always fetch
-;;; it off of the stack using the arg pointer.
+;;; This is similar to Make-Return-PC-Passing-Location, but makes a
+;;; location to pass Old-FP in. This is (obviously) wired in the
+;;; standard convention, but is totally unrestricted in non-standard
+;;; conventions, since we can always fetch it off of the stack using
+;;; the arg pointer.
;;;
(!def-vm-support-routine make-old-fp-passing-location (standard)
(if standard
(make-wired-tn *fixnum-primitive-type* immediate-arg-scn ocfp-offset)
(make-normal-tn *fixnum-primitive-type*)))
-;;; Make-Old-FP-Save-Location, Make-Return-PC-Save-Location -- Interface
-;;;
-;;; Make the TNs used to hold Old-FP and Return-PC within the current
-;;; function. We treat these specially so that the debugger can find them at a
-;;; known location.
-;;;
+;;; These functions make the TNs used to hold Old-FP and Return-PC
+;;; within the current function. We treat these specially so that the
+;;; debugger can find them at a known location.
(!def-vm-support-routine make-old-fp-save-location (env)
(specify-save-tn
(environment-debug-live-tn (make-normal-tn *fixnum-primitive-type*) env)
(make-wired-tn *fixnum-primitive-type*
control-stack-arg-scn
ocfp-save-offset)))
-;;;
(!def-vm-support-routine make-return-pc-save-location (env)
(let ((ptype #!-gengc *backend-t-primitive-type*
#!+gengc *fixnum-primitive-type*))
(make-wired-tn ptype control-stack-arg-scn
#!-gengc lra-save-offset #!+gengc ra-save-offset))))
-;;; Make-Argument-Count-Location -- Interface
-;;;
-;;; Make a TN for the standard argument count passing location. We only
-;;; need to make the standard location, since a count is never passed when we
-;;; are using non-standard conventions.
-;;;
+;;; Make a TN for the standard argument count passing location. We
+;;; only need to make the standard location, since a count is never
+;;; passed when we are using non-standard conventions.
(!def-vm-support-routine make-argument-count-location ()
(make-wired-tn *fixnum-primitive-type* immediate-arg-scn nargs-offset))
-;;; MAKE-NFP-TN -- Interface
-;;;
-;;; Make a TN to hold the number-stack frame pointer. This is allocated
-;;; once per component, and is component-live.
-;;;
+;;; Make a TN to hold the number-stack frame pointer. This is
+;;; allocated once per component, and is component-live.
(!def-vm-support-routine make-nfp-tn ()
(component-live-tn
(make-wired-tn *fixnum-primitive-type* immediate-arg-scn nfp-offset)))
-;;; MAKE-STACK-POINTER-TN ()
-;;;
(!def-vm-support-routine make-stack-pointer-tn ()
(make-normal-tn *fixnum-primitive-type*))
-;;; MAKE-NUMBER-STACK-POINTER-TN ()
-;;;
(!def-vm-support-routine make-number-stack-pointer-tn ()
(make-normal-tn *fixnum-primitive-type*))
-;;; Make-Unknown-Values-Locations -- Interface
-;;;
-;;; Return a list of TNs that can be used to represent an unknown-values
-;;; continuation within a function.
-;;;
+;;; Return a list of TNs that can be used to represent an
+;;; unknown-values continuation within a function.
(!def-vm-support-routine make-unknown-values-locations ()
(list (make-stack-pointer-tn)
(make-normal-tn *fixnum-primitive-type*)))
-;;; Select-Component-Format -- Interface
-;;;
-;;; This function is called by the Entry-Analyze phase, allowing
-;;; VM-dependent initialization of the IR2-Component structure. We push
-;;; placeholder entries in the Constants to leave room for additional
-;;; noise in the code object header.
-;;;
+;;; This function is called by the Entry-Analyze phase, allowing
+;;; VM-dependent initialization of the IR2-Component structure. We
+;;; push placeholder entries in the Constants to leave room for
+;;; additional noise in the code object header.
(!def-vm-support-routine select-component-format (component)
(declare (type component component))
(dotimes (i code-constants-offset)
(values))
\f
-;;;; Frame hackery:
+;;;; frame hackery
-;;; BYTES-NEEDED-FOR-NON-DESCRIPTOR-STACK-FRAME -- internal
-;;;
-;;; Return the number of bytes needed for the current non-descriptor stack
-;;; frame. Non-descriptor stack frames must be multiples of 8 bytes on
-;;; the PMAX.
-;;;
+;;; Return the number of bytes needed for the current non-descriptor
+;;; stack frame. Non-descriptor stack frames must be multiples of 8
+;;; bytes on the PMAX.
(defun bytes-needed-for-non-descriptor-stack-frame ()
(* (logandc2 (1+ (sb-allocated-size 'non-descriptor-stack)) 1)
word-bytes))
-;;; Used for setting up the Old-FP in local call.
-;;;
+;;; This is used for setting up the Old-FP in local call.
(define-vop (current-fp)
(:results (val :scs (any-reg)))
(:generator 1
(move cfp-tn val)))
-;;; Used for computing the caller's NFP for use in known-values return. Only
-;;; works assuming there is no variable size stuff on the nstack.
-;;;
+;;; This is used for computing the caller's NFP for use in
+;;; known-values return. It only works assuming there is no variable
+;;; size stuff on the nstack.
(define-vop (compute-old-nfp)
(:results (val :scs (any-reg)))
(:vop-var vop)
(when nfp
(inst addq nfp (bytes-needed-for-non-descriptor-stack-frame) val)))))
-
(define-vop (xep-allocate-frame)
(:info start-lab copy-more-arg-follows)
(:ignore copy-more-arg-follows)
(:vop-var vop)
(:temporary (:scs (non-descriptor-reg)) temp)
(:generator 1
- ;; Make sure the function is aligned, and drop a label pointing to this
- ;; function header.
+ ;; Make sure the function is aligned, and drop a label pointing to
+ ;; this function header.
(align lowtag-bits)
(trace-table-entry trace-table-function-prologue)
(emit-label start-lab)
(let ((entry-point (gen-label)))
(emit-label entry-point)
(inst compute-code-from-fn code-tn lip-tn entry-point temp)
- ;; ### We should also save it on the stack so that the garbage collector
- ;; won't forget about us if we call anyone else.
+ ;; ### We should also save it on the stack so that the garbage
+ ;; collector won't forget about us if we call anyone else.
)
;; Build our stack frames.
(inst lda csp-tn (* word-bytes (sb-allocated-size 'control-stack)) cfp-tn)
(move nsp-tn nfp))
(trace-table-entry trace-table-normal)))
-;;; Allocate a partial frame for passing stack arguments in a full call. Nargs
-;;; is the number of arguments passed. If no stack arguments are passed, then
-;;; we don't have to do anything.
-;;;
+;;; Allocate a partial frame for passing stack arguments in a full
+;;; call. Nargs is the number of arguments passed. If no stack
+;;; arguments are passed, then we don't have to do anything.
(define-vop (allocate-full-call-frame)
(:info nargs)
(:results (res :scs (any-reg)))
\f
-;;; Default-Unknown-Values -- Internal
-;;;
-;;; Emit code needed at the return-point from an unknown-values call for a
-;;; fixed number of values. Values is the head of the TN-Ref list for the
-;;; locations that the values are to be received into. Nvals is the number of
-;;; values that are to be received (should equal the length of Values).
+;;; Emit code needed at the return-point from an unknown-values call
+;;; for a fixed number of values. Values is the head of the TN-Ref
+;;; list for the locations that the values are to be received into.
+;;; Nvals is the number of values that are to be received (should
+;;; equal the length of Values).
;;;
-;;; Move-Temp is a Descriptor-Reg TN used as a temporary.
+;;; Move-Temp is a Descriptor-Reg TN used as a temporary.
;;;
-;;; This code exploits the fact that in the unknown-values convention, a
-;;; single value return returns at the return PC + 8, whereas a return of other
-;;; than one value returns directly at the return PC.
+;;; This code exploits the fact that in the unknown-values convention,
+;;; a single value return returns at the return PC + 8, whereas a
+;;; return of other than one value returns directly at the return PC.
;;;
-;;; If 0 or 1 values are expected, then we just emit an instruction to reset
-;;; the SP (which will only be executed when other than 1 value is returned.)
+;;; If 0 or 1 values are expected, then we just emit an instruction to
+;;; reset the SP (which will only be executed when other than 1 value
+;;; is returned.)
;;;
;;; In the general case, we have to do three things:
;;; -- Default unsupplied register values. This need only be done when a
br defaulting-done
nop
|#
-;;;
(defun default-unknown-values (vop values nvals move-temp temp lra-label)
(declare (type (or tn-ref null) values)
(type unsigned-byte nvals) (type tn move-temp temp))
(if (<= nvals 1)
(progn
- ;; Note that this is a single-value return point. This is actually
- ;; the multiple-value entry point for a single desired value, but
- ;; the code location has to be here, or the debugger backtrace
- ;; gets confused.
+ ;; Note that this is a single-value return point. This is
+ ;; actually the multiple-value entry point for a single
+ ;; desired value, but the code location has to be here, or the
+ ;; debugger backtrace gets confused.
(without-scheduling ()
(note-this-location vop :single-value-return)
(move ocfp-tn csp-tn)
#!-gengc (inst compute-code-from-lra code-tn code-tn lra-label temp)
#!+gengc (inst compute-code-from-ra code-tn ra-tn lra-label temp))))
(values))
-
\f
-;;;; Unknown values receiving:
+;;;; unknown values receiving
-;;; Receive-Unknown-Values -- Internal
+;;; Emit code needed at the return point for an unknown-values call
+;;; for an arbitrary number of values.
;;;
-;;; Emit code needed at the return point for an unknown-values call for an
-;;; arbitrary number of values.
+;;; We do the single and non-single cases with no shared code: there
+;;; doesn't seem to be any potential overlap, and receiving a single
+;;; value is more important efficiency-wise.
;;;
-;;; We do the single and non-single cases with no shared code: there doesn't
-;;; seem to be any potential overlap, and receiving a single value is more
-;;; important efficiency-wise.
+;;; When there is a single value, we just push it on the stack,
+;;; returning the old SP and 1.
;;;
-;;; When there is a single value, we just push it on the stack, returning
-;;; the old SP and 1.
-;;;
-;;; When there is a variable number of values, we move all of the argument
-;;; registers onto the stack, and return Args and Nargs.
-;;;
-;;; Args and Nargs are TNs wired to the named locations. We must
-;;; explicitly allocate these TNs, since their lifetimes overlap with the
-;;; results Start and Count (also, it's nice to be able to target them).
+;;; When there is a variable number of values, we move all of the
+;;; argument registers onto the stack, and return Args and Nargs.
;;;
+;;; Args and Nargs are TNs wired to the named locations. We must
+;;; explicitly allocate these TNs, since their lifetimes overlap with
+;;; the results Start and Count (also, it's nice to be able to target
+;;; them).
(defun receive-unknown-values (args nargs start count lra-label temp)
(declare (type tn args nargs start count temp))
(let ((variable-values (gen-label))
(inst br zero-tn done)))
(values))
-
-;;; VOP that can be inherited by unknown values receivers. The main thing this
-;;; handles is allocation of the result temporaries.
-;;;
+;;; a VOP that can be inherited by unknown values receivers. The main
+;;; thing this handles is allocation of the result temporaries.
(define-vop (unknown-values-receiver)
(:results
(start :scs (any-reg))
:from :eval :to (:result 1))
nvals)
(:temporary (:scs (non-descriptor-reg)) temp))
-
-
\f
-;;;; Local call with unknown values convention return:
+;;;; local call with unknown values convention return
;;; Non-TR local call for a fixed number of values passed according to the
;;; unknown values convention.
;;; Values are the return value locations (wired to the standard passing
;;; locations).
;;;
-;;; Save is the save info, which we can ignore since saving has been done.
-;;; Return-PC is the TN that the return PC should be passed in.
-;;; Target is a continuation pointing to the start of the called function.
-;;; Nvals is the number of values received.
-;;;
-;;; Note: we can't use normal load-tn allocation for the fixed args, since all
-;;; registers may be tied up by the more operand. Instead, we use
-;;; MAYBE-LOAD-STACK-TN.
+;;; Save is the save info, which we can ignore since saving has been
+;;; done. Return-PC is the TN that the return PC should be passed in.
+;;; Target is a continuation pointing to the start of the called
+;;; function. Nvals is the number of values received.
;;;
+;;; Note: we can't use normal load-tn allocation for the fixed args,
+;;; since all registers may be tied up by the more operand. Instead,
+;;; we use MAYBE-LOAD-STACK-TN.
(define-vop (call-local)
(:args (fp)
(nfp)
(maybe-load-stack-nfp-tn cur-nfp nfp-save temp))))
-;;; Non-TR local call for a variable number of return values passed according
-;;; to the unknown values convention. The results are the start of the values
-;;; glob and the number of values received.
-;;;
-;;; Note: we can't use normal load-tn allocation for the fixed args, since all
-;;; registers may be tied up by the more operand. Instead, we use
-;;; MAYBE-LOAD-STACK-TN.
+;;; Non-TR local call for a variable number of return values passed
+;;; according to the unknown values convention. The results are the
+;;; start of the values glob and the number of values received.
;;;
+;;; Note: we can't use normal load-tn allocation for the fixed args,
+;;; since all registers may be tied up by the more operand. Instead,
+;;; we use MAYBE-LOAD-STACK-TN.
(define-vop (multiple-call-local unknown-values-receiver)
(:args (fp)
(nfp)
(maybe-load-stack-nfp-tn cur-nfp nfp-save temp))))
\f
-;;;; Local call with known values return:
+;;;; local call with known values return
-;;; Non-TR local call with known return locations. Known-value return works
-;;; just like argument passing in local call.
+;;; Non-TR local call with known return locations. Known-value return
+;;; works just like argument passing in local call.
;;;
;;; Note: we can't use normal load-tn allocation for the fixed args, since all
;;; registers may be tied up by the more operand. Instead, we use
;;; MAYBE-LOAD-STACK-TN.
-;;;
(define-vop (known-call-local)
(:args (fp)
(nfp)
(note-this-location vop :known-return)
(maybe-load-stack-nfp-tn cur-nfp nfp-save temp))))
-;;; Return from known values call. We receive the return locations as
-;;; arguments to terminate their lifetimes in the returning function. We
-;;; restore FP and CSP and jump to the Return-PC.
-;;;
-;;; Note: we can't use normal load-tn allocation for the fixed args, since all
-;;; registers may be tied up by the more operand. Instead, we use
-;;; MAYBE-LOAD-STACK-TN.
+;;; Return from known values call. We receive the return locations as
+;;; arguments to terminate their lifetimes in the returning function.
+;;; We restore FP and CSP and jump to the Return-PC.
;;;
+;;; Note: we can't use normal load-tn allocation for the fixed args,
+;;; since all registers may be tied up by the more operand. Instead,
+;;; we use MAYBE-LOAD-STACK-TN.
(define-vop (known-return)
(:args (ocfp :target ocfp-temp)
(return-pc :target return-pc-temp)
(vals :more t))
(:temporary (:sc any-reg :from (:argument 0)) ocfp-temp)
- (:temporary (:sc #!-gengc descriptor-reg #!+gengc any-reg :from (:argument 1))
+ (:temporary (:sc #!-gengc descriptor-reg #!+gengc any-reg
+ :from (:argument 1))
return-pc-temp)
#!-gengc (:temporary (:scs (interior-reg)) lip)
(:move-args :known-return)
\f
;;;; Full call:
-;;;
-;;; There is something of a cross-product effect with full calls. Different
-;;; versions are used depending on whether we know the number of arguments or
-;;; the name of the called function, and whether we want fixed values, unknown
-;;; values, or a tail call.
-;;;
-;;; In full call, the arguments are passed creating a partial frame on the
-;;; stack top and storing stack arguments into that frame. On entry to the
-;;; callee, this partial frame is pointed to by FP. If there are no stack
-;;; arguments, we don't bother allocating a partial frame, and instead set FP
-;;; to SP just before the call.
-
-;;; Define-Full-Call -- Internal
-;;;
-;;; This macro helps in the definition of full call VOPs by avoiding code
-;;; replication in defining the cross-product VOPs.
+;;;;
+;;;; There is something of a cross-product effect with full calls.
+;;;; Different versions are used depending on whether we know the
+;;;; number of arguments or the name of the called function, and
+;;;; whether we want fixed values, unknown values, or a tail call.
+;;;;
+;;;; In full call, the arguments are passed creating a partial frame on
+;;;; the stack top and storing stack arguments into that frame. On
+;;;; entry to the callee, this partial frame is pointed to by FP. If
+;;;; there are no stack arguments, we don't bother allocating a partial
+;;;; frame, and instead set FP to SP just before the call.
+
+;;; This macro helps in the definition of full call VOPs by avoiding
+;;; code replication in defining the cross-product VOPs.
;;;
;;; Name is the name of the VOP to define.
;;;
-;;; Named is true if the first argument is a symbol whose global function
-;;; definition is to be called.
+;;; Named is true if the first argument is a symbol whose global
+;;; function definition is to be called.
;;;
;;; Return is either :Fixed, :Unknown or :Tail:
;;; -- If :Fixed, then the call is for a fixed number of values, returned in
;;; -- If :Tail, then do a tail-recursive call. No values are returned.
;;; The Ocfp and Return-PC are passed as the second and third arguments.
;;;
-;;; In non-tail calls, the pointer to the stack arguments is passed as the last
-;;; fixed argument. If Variable is false, then the passing locations are
-;;; passed as a more arg. Variable is true if there are a variable number of
-;;; arguments passed on the stack. Variable cannot be specified with :Tail
-;;; return. TR variable argument call is implemented separately.
-;;;
-;;; In tail call with fixed arguments, the passing locations are passed as a
-;;; more arg, but there is no new-FP, since the arguments have been set up in
-;;; the current frame.
+;;; In non-tail calls, the pointer to the stack arguments is passed as
+;;; the last fixed argument. If Variable is false, then the passing
+;;; locations are passed as a more arg. Variable is true if there are
+;;; a variable number of arguments passed on the stack. Variable
+;;; cannot be specified with :Tail return. TR variable argument call
+;;; is implemented separately.
;;;
+;;; In tail call with fixed arguments, the passing locations are
+;;; passed as a more arg, but there is no new-FP, since the arguments
+;;; have been set up in the current frame.
(defmacro define-full-call (name named return variable)
(assert (not (and variable (eq return :tail))))
`(define-vop (,name
(maybe-load-stack-nfp-tn cur-nfp nfp-save temp)))
(:tail))))))
-
(define-full-call call nil :fixed nil)
(define-full-call call-named t :fixed nil)
(define-full-call multiple-call nil :unknown nil)
(define-full-call call-variable nil :fixed t)
(define-full-call multiple-call-variable nil :unknown t)
-
-;;; Defined separately, since needs special code that BLT's the arguments
-;;; down.
-;;;
+;;; This is defined separately, since it needs special code that blits
+;;; the arguments down.
(define-vop (tail-call-variable)
(:args
(args-arg :scs (any-reg) :target args)
;; And jump to the assembly-routine that does the bliting.
(inst li (make-fixup 'tail-call-variable :assembly-routine) temp)
(inst jmp zero-tn temp)))
-
\f
-;;;; Unknown values return:
+;;;; unknown values return
;;; Return a single value using the unknown-values convention.
-;;;
(define-vop (return-single)
(:args (ocfp :scs (any-reg))
#!-gengc (return-pc :scs (descriptor-reg))
(inst ret zero-tn temp 1))
(trace-table-entry trace-table-normal)))
-
-;;; Do unknown-values return of a fixed number of values. The Values are
-;;; required to be set up in the standard passing locations. Nvals is the
-;;; number of values returned.
+;;; Do unknown-values return of a fixed number of values. The Values
+;;; are required to be set up in the standard passing locations. Nvals
+;;; is the number of values returned.
;;;
-;;; If returning a single value, then deallocate the current frame, restore
-;;; FP and jump to the single-value entry at Return-PC + 8.
-;;;
-;;; If returning other than one value, then load the number of values returned,
-;;; NIL out unsupplied values registers, restore FP and return at Return-PC.
-;;; When there are stack values, we must initialize the argument pointer to
-;;; point to the beginning of the values block (which is the beginning of the
-;;; current frame.)
+;;; If returning a single value, then deallocate the current frame,
+;;; restore FP and jump to the single-value entry at Return-PC + 8.
;;;
+;;; If returning other than one value, then load the number of values
+;;; returned, NIL out unsupplied values registers, restore FP and
+;;; return at Return-PC. When there are stack values, we must
+;;; initialize the argument pointer to point to the beginning of the
+;;; values block (which is the beginning of the current frame.)
(define-vop (return)
(:args (ocfp :scs (any-reg))
- (return-pc :scs (#!-gengc descriptor-reg #!+gengc any-reg) :to (:eval 1)
+ (return-pc :scs (#!-gengc descriptor-reg #!+gengc any-reg)
+ :to (:eval 1)
#!+gengc :target #!+gengc ra)
(values :more t))
(:ignore values)
(lisp-return return-pc lip)
(trace-table-entry trace-table-normal)))
-;;; Do unknown-values return of an arbitrary number of values (passed on the
-;;; stack.) We check for the common case of a single return value, and do that
-;;; inline using the normal single value return convention. Otherwise, we
-;;; branch off to code that calls an assembly-routine.
-;;;
+;;; Do unknown-values return of an arbitrary number of values (passed
+;;; on the stack.) We check for the common case of a single return
+;;; value, and do that inline using the normal single value return
+;;; convention. Otherwise, we branch off to code that calls an
+;;; assembly-routine.
(define-vop (return-multiple)
(:args (ocfp-arg :scs (any-reg) :target ocfp)
#!-gengc (lra-arg :scs (descriptor-reg) :target lra)
(inst li (make-fixup 'return-multiple :assembly-routine) temp)
(inst jmp zero-tn temp))
(trace-table-entry trace-table-normal)))
-
-
\f
-;;;; XEP hackery:
-
+;;;; XEP hackery
;;; We don't need to do anything special for regular functions.
-;;;
(define-vop (setup-environment)
(:info label)
(:ignore label)
))
;;; Get the lexical environment from its passing location.
-;;;
(define-vop (setup-closure-environment)
(:temporary (:sc descriptor-reg :offset lexenv-offset :target closure
:to (:result 0))
;; Get result.
(move lexenv closure)))
-;;; Copy a more arg from the argument area to the end of the current frame.
-;;; Fixed is the number of non-more arguments.
-;;;
+;;; Copy a &MORE arg from the argument area to the end of the current
+;;; frame. FIXED is the number of non-more arguments.
(define-vop (copy-more-arg)
(:temporary (:sc any-reg :offset nl0-offset) result)
(:temporary (:sc any-reg :offset nl1-offset) count)
(inst subq count (fixnumize 1) count)))
(emit-label done))))
-
-;;; More args are stored consequtively on the stack, starting immediately at
-;;; the context pointer. The context pointer is not typed, so the lowtag is 0.
-;;;
+;;; &More args are stored consecutively on the stack, starting
+;;; immediately at the context pointer. The context pointer is not
+;;; typed, so the lowtag is 0.
(define-full-reffer more-arg * 0 0 (descriptor-reg any-reg) * %more-arg)
-
-;;; Turn more arg (context, count) into a list.
-;;;
+;;; Turn &MORE arg (context, count) into a list.
(define-vop (listify-rest-args)
(:args (context-arg :target context :scs (descriptor-reg))
(count-arg :target count :scs (any-reg)))
(storew null-tn dst 1 list-pointer-type))
(emit-label done))))
-;;; Return the location and size of the more arg glob created by Copy-More-Arg.
-;;; Supplied is the total number of arguments supplied (originally passed in
-;;; NARGS.) Fixed is the number of non-rest arguments.
-;;;
-;;; We must duplicate some of the work done by Copy-More-Arg, since at that
-;;; time the environment is in a pretty brain-damaged state, preventing this
-;;; info from being returned as values. What we do is compute
-;;; supplied - fixed, and return a pointer that many words below the current
-;;; stack top.
+;;; Return the location and size of the &MORE arg glob created by
+;;; Copy-More-Arg. Supplied is the total number of arguments supplied
+;;; (originally passed in NARGS.) Fixed is the number of non-&rest
+;;; arguments.
;;;
+;;; We must duplicate some of the work done by Copy-More-Arg, since at
+;;; that time the environment is in a pretty brain-damaged state,
+;;; preventing this info from being returned as values. What we do is
+;;; compute supplied - fixed, and return a pointer that many words
+;;; below the current stack top.
(define-vop (more-arg-context)
(:policy :fast-safe)
(:translate sb!c::%more-arg-context)
(inst subq csp-tn count context)))
-;;; Signal wrong argument count error if Nargs isn't = to Count.
-;;;
+;;; Signal wrong argument count error if Nargs isn't equal to Count.
(define-vop (verify-argument-count)
(:policy :fast-safe)
(:translate sb!c::%verify-argument-count)
(inst subq nargs (fixnumize count) temp)
(inst bne temp err-lab))))))
-;;; Various other error signalers.
-;;;
+;;; various other error signalers
(macrolet ((frob (name error translate &rest args)
`(define-vop (,name)
,@(when translate
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