X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcompiler%2Fsparc%2Fcall.lisp;h=9c1094dfb89e7d2759e3c5c41cabd3209693dbcc;hb=42ab0c5b87f834c69842713c60587a76f953411f;hp=b3b4abb37a7b10db966db302658b6308dd27c7c5;hpb=52cfe54802db8736f1f4e2b67764c43bba9b78b3;p=sbcl.git

diff --git a/src/compiler/sparc/call.lisp b/src/compiler/sparc/call.lisp
index b3b4abb..9c1094d 100644
--- a/src/compiler/sparc/call.lisp
+++ b/src/compiler/sparc/call.lisp
@@ -619,7 +619,8 @@ default-value-8
      (: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))
@@ -663,6 +664,8 @@ default-value-8
      ,@(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)))
@@ -676,6 +679,7 @@ default-value-8
        (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
@@ -737,7 +741,26 @@ default-value-8
                                     '(if (> nargs register-arg-count)
                                          (move cfp-tn new-fp)
                                          (move cfp-tn csp-tn))))))
-                      ((nil))))))
+                      ((nil)))))
+                (insert-step-instrumenting (callable-tn)
+                  ;; Conditionally insert a conditional trap:
+                  (when step-instrumenting
+                    ;; Get the symbol-value of SB!IMPL::*STEPPING*
+                    (load-symbol-value stepping sb!impl::*stepping*)
+                    (inst cmp stepping null-tn)
+                    ;; If it's not null, trap.
+                    (inst b :eq step-done-label)
+                    (inst nop)
+                    ;; FIXME: this doesn't look right.
+                    (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 unimp (logior single-step-around-trap
+                                        (ash (reg-tn-encoding callable-tn)
+                                             5)))
+                    (emit-label step-done-label))))
+
 
            ,@(if named
                  `((sc-case name
@@ -749,6 +772,7 @@ default-value-8
                       (loadw name-pass code-tn (tn-offset name)
                              other-pointer-lowtag)
                       (do-next-filler)))
+                   (insert-step-instrumenting name-pass)
                    (loadw function name-pass fdefn-raw-addr-slot
                           other-pointer-lowtag)
                    (do-next-filler))
@@ -763,7 +787,8 @@ default-value-8
                       (do-next-filler)))
                    (loadw function lexenv closure-fun-slot
                           fun-pointer-lowtag)
-                   (do-next-filler)))
+                   (do-next-filler)
+                   (insert-step-instrumenting function)))
            (loop
              (if filler
                  (do-next-filler)
@@ -1200,3 +1225,18 @@ default-value-8
   (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
+    (load-symbol-value stepping sb!impl::*stepping*)
+    (inst cmp stepping null-tn)
+    (inst b :eq DONE)
+    (inst nop)
+    (note-this-location vop :step-before-vop)
+    (inst unimp single-step-before-trap)
+    DONE))