(:vop-var vop)
(:info ,@(unless (or variable (eq return :tail)) '(arg-locs))
,@(unless variable '(nargs))
- ,@(when (eq return :fixed) '(nvals)))
+ ,@(when (eq return :fixed) '(nvals))
+ step-instrumenting)
(:ignore ,@(unless (or variable (eq return :tail)) '(arg-locs))
,@(unless variable '(args)))
,@(when (eq return :fixed)
'((:temporary (:scs (descriptor-reg) :from :eval) move-temp)))
+ (:temporary (:scs (descriptor-reg) :to :eval) stepping)
+
,@(unless (eq return :tail)
'((:temporary (:scs (non-descriptor-reg)) temp)
(:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)))
(let* ((cur-nfp (current-nfp-tn vop))
,@(unless (eq return :tail)
'((lra-label (gen-label))))
+ (step-done-label (gen-label))
(filler
(remove nil
(list :load-nargs
(move cfp-tn csp-tn)))
(trace-table-entry trace-table-call-site))))
((nil)
- (inst nop))))))
+ (inst nop)))))
+ (insert-step-instrumenting (callable-tn)
+ ;; Conditionally insert a conditional trap:
+ (when step-instrumenting
+ ;; Get the symbol-value of SB!IMPL::*STEPPING*
+ (inst lw stepping null-tn
+ (- (+ symbol-value-slot
+ (truncate (static-symbol-offset 'sb!impl::*stepping*)
+ n-word-bytes))
+ other-pointer-lowtag))
+ ;; If it's not NIL, trap.
+ (inst beq stepping null-tn step-done-label)
+ (inst nop)
+ ;; CONTEXT-PC will be pointing here when the
+ ;; interrupt is handled, not after the BREAK.
+ (note-this-location vop :step-before-vop)
+ ;; Construct a trap code with the low bits from
+ ;; SINGLE-STEP-AROUND-TRAP and the high bits from
+ ;; the register number of CALLABLE-TN.
+ (inst break 0 (logior single-step-around-trap
+ (ash (reg-tn-encoding callable-tn)
+ 5)))
+ (emit-label step-done-label))))
,@(if named
`((sc-case name
(- (ash (tn-offset name) word-shift)
other-pointer-lowtag))
(do-next-filler)))
+ ;; The step instrumenting must be done after
+ ;; FUNCTION is loaded, but before ENTRY-POINT is
+ ;; calculated.
+ (insert-step-instrumenting name-pass)
(inst lw entry-point name-pass
(- (ash fdefn-raw-addr-slot word-shift)
other-pointer-lowtag))
(- (ash closure-fun-slot word-shift)
fun-pointer-lowtag))
(do-next-filler)
+ ;; The step instrumenting must be done before
+ ;; after FUNCTION is loaded, but before ENTRY-POINT
+ ;; is calculated.
+ (insert-step-instrumenting function)
(inst addu entry-point function
(- (ash simple-fun-code-offset word-shift)
fun-pointer-lowtag))))
(frob unknown-key-arg-error unknown-key-arg-error
sb!c::%unknown-key-arg-error key)
(frob nil-fun-returned-error nil-fun-returned-error nil fun))
+
+;;; Single-stepping
+
+(define-vop (step-instrument-before-vop)
+ (:temporary (:scs (descriptor-reg)) stepping)
+ (:policy :fast-safe)
+ (:vop-var vop)
+ (:generator 3
+ ;; Get the symbol-value of SB!IMPL::*STEPPING*
+ (inst lw stepping null-tn
+ (- (+ symbol-value-slot
+ (truncate (static-symbol-offset 'sb!impl::*stepping*)
+ n-word-bytes))
+ other-pointer-lowtag))
+ ;; If it's not NIL, trap.
+ (inst beq stepping null-tn DONE)
+ (inst nop)
+ ;; CONTEXT-PC will be pointing here when the interrupt is handled,
+ ;; not after the BREAK.
+ (note-this-location vop :step-before-vop)
+ ;; CALLEE-REGISTER-OFFSET isn't needed for before-traps, so we
+ ;; can just use a bare SINGLE-STEP-BEFORE-TRAP as the code.
+ (inst break 0 single-step-before-trap)
+ DONE))