X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcompiler%2Fx86%2Fvm.lisp;h=5313dc3421bfd536cc2eecf7cdfd3a76bd4e90db;hb=0f275066654d7412ede836567fb5423c9ddc957d;hp=5099c3c82c1757e5bbbcf658d5b19f0954318230;hpb=45b5a21316381ecab98a0e5a5296294e044170e8;p=sbcl.git

diff --git a/src/compiler/x86/vm.lisp b/src/compiler/x86/vm.lisp
index 5099c3c..5313dc3 100644
--- a/src/compiler/x86/vm.lisp
+++ b/src/compiler/x86/vm.lisp
@@ -161,7 +161,7 @@
 ;;; has my gratitude.) (FIXME: Maybe this should be me..)
 (eval-when (:compile-toplevel :load-toplevel :execute)
   (def!constant kludge-nondeterministic-catch-block-size
-      #!-win32 6 #!+win32 8))
+      #!-win32 5 #!+win32 7))
 
 (!define-storage-classes
 
@@ -232,6 +232,8 @@
   (character-reg registers
                  :locations #!-sb-unicode #.*byte-regs*
                             #!+sb-unicode #.*dword-regs*
+                 #!+sb-unicode #!+sb-unicode
+                 :element-size 2
                  #!-sb-unicode #!-sb-unicode
                  :reserve-locations (#.ah-offset #.al-offset)
                  :constant-scs (immediate)
@@ -382,7 +384,7 @@
 (!def-vm-support-routine immediate-constant-sc (value)
   (typecase value
     ((or (integer #.sb!xc:most-negative-fixnum #.sb!xc:most-positive-fixnum)
-         #-sb-xc-host system-area-pointer character)
+         character)
      (sc-number-or-lose 'immediate))
     (symbol
      (when (static-symbol-p value)
@@ -402,13 +404,43 @@
                (eql value (log 2l0 10l0))
                (eql value (log 2l0 2.718281828459045235360287471352662L0)))
        (sc-number-or-lose 'fp-constant)))))
+
+;; For an immediate TN, return its value encoded for use as a literal.
+;; For any other TN, return the TN.  Only works for FIXNUMs,
+;; STATIC-SYMBOLs, and CHARACTERS (FLOATs and SAPs are handled
+;; elsewhere).
+(defun encode-value-if-immediate (tn)
+  (if (sc-is tn immediate)
+      (let ((val (tn-value tn)))
+        (etypecase val
+          (integer (fixnumize val))
+          (symbol (+ nil-value (static-symbol-offset val)))
+          (character (logior (ash (char-code val) n-widetag-bits)
+                             character-widetag))))
+      tn))
 
 ;;;; miscellaneous function call parameters
 
-;;; offsets of special stack frame locations
-(def!constant ocfp-save-offset 0)
-(def!constant return-pc-save-offset 1)
-(def!constant code-save-offset 2)
+;;; Offsets of special stack frame locations relative to EBP.
+;;;
+;;; Consider the standard prologue PUSH EBP; MOV EBP, ESP: the return
+;;; address is at EBP+4, the old control stack frame pointer is at
+;;; EBP, the magic 3rd slot is at EBP-4. Then come the locals from
+;;; EBP-8 on.
+(def!constant return-pc-save-offset 0)
+(def!constant ocfp-save-offset 1)
+;;; Let SP be the stack pointer before CALLing, and FP is the frame
+;;; pointer after the standard prologue. SP +
+;;; FRAME-WORD-OFFSET(SP->FP-OFFSET + I) = FP + FRAME-WORD-OFFSET(I).
+(def!constant sp->fp-offset 2)
+
+(declaim (inline frame-word-offset))
+(defun frame-word-offset (index)
+  (- (1- index)))
+
+(declaim (inline frame-byte-offset))
+(defun frame-byte-offset (index)
+  (* (frame-word-offset index) n-word-bytes))
 
 ;;; FIXME: This is a bad comment (changed since when?) and there are others
 ;;; like it in this file. It'd be nice to clarify them. Failing that deleting