X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcompiler%2Fmips%2Fcall.lisp;h=68e5062d33779a150c17749ae97da584a8c8bdd5;hb=997959cc458b00ff7faae526511533d24bdc0fde;hp=38f1528186f823f8610cf400553fcb2e28e9932e;hpb=7aa246fdcbb1da73dd1d5ae38d2d17cd04c5f9b7;p=sbcl.git

diff --git a/src/compiler/mips/call.lisp b/src/compiler/mips/call.lisp
index 38f1528..68e5062 100644
--- a/src/compiler/mips/call.lisp
+++ b/src/compiler/mips/call.lisp
@@ -128,6 +128,23 @@
       (when nfp
         (inst addu val nfp (bytes-needed-for-non-descriptor-stack-frame))))))
 
+;;; Accessing a slot from an earlier stack frame is definite hackery.
+(define-vop (ancestor-frame-ref)
+  (:args (frame-pointer :scs (descriptor-reg))
+         (variable-home-tn :load-if nil))
+  (:results (value :scs (descriptor-reg any-reg)))
+  (:policy :fast-safe)
+  (:generator 4
+    (aver (sc-is variable-home-tn control-stack))
+    (loadw value frame-pointer (tn-offset variable-home-tn))))
+(define-vop (ancestor-frame-set)
+  (:args (frame-pointer :scs (descriptor-reg))
+         (value :scs (descriptor-reg any-reg)))
+  (:results (variable-home-tn :load-if nil))
+  (:policy :fast-safe)
+  (:generator 4
+    (aver (sc-is variable-home-tn control-stack))
+    (storew value frame-pointer (tn-offset variable-home-tn))))
 
 (define-vop (xep-allocate-frame)
   (:info start-lab copy-more-arg-follows)