--- gforth/Attic/engine.c	1994/06/01 16:40:01	1.8
+++ gforth/Attic/engine.c	1994/09/08 17:20:05	1.14
@@ -1,5 +1,5 @@
 /*
-  $Id: engine.c,v 1.8 1994/06/01 16:40:01 pazsan Exp $
+  $Id: engine.c,v 1.14 1994/09/08 17:20:05 anton Exp $
   Copyright 1992 by the ANSI figForth Development Group
 */
 
@@ -14,7 +14,6 @@
 #include <stdlib.h>
 #include <time.h>
 #include <sys/time.h>
-#include <unistd.h>
 #include "forth.h"
 #include "io.h"
 
@@ -42,20 +41,34 @@ typedef struct F83Name {
 #define F83NAME_SMUDGE(np)	(((np)->countetc & 0x40) != 0)
 #define F83NAME_IMMEDIATE(np)	(((np)->countetc & 0x20) != 0)
 
-/* NEXT and NEXT1 are split into several parts to help scheduling */
+/* NEXT and NEXT1 are split into several parts to help scheduling,
+   unless CISC_NEXT is defined */
+#ifdef CISC_NEXT
+#define NEXT1_P1
+#define NEXT_P1
+#define DEF_CA
 #ifdef DIRECT_THREADED
-#	define NEXT1_P1 
-#	define NEXT1_P2 ({goto *cfa;})
-#	define DEF_CA
-#else
-#	define NEXT1_P1 ({ca = *cfa;})
-#	define NEXT1_P2 ({goto *ca;})
-#	define DEF_CA	Label ca;
-#endif
-#define NEXT_P1 ({cfa = *ip++; NEXT1_P1;})
+#define NEXT1_P2 ({goto *cfa;})
+#else
+#define NEXT1_P2 ({goto **cfa;})
+#endif /* DIRECT_THREADED */
+#define NEXT_P2 ({cfa = *ip++; NEXT1_P2;})
+#else /* CISC_NEXT */
+#ifdef DIRECT_THREADED
+#define NEXT1_P1
+#define NEXT1_P2 ({goto *cfa;})
+#define DEF_CA
+#else /* DIRECT_THREADED */
+#define NEXT1_P1 ({ca = *cfa;})
+#define NEXT1_P2 ({goto *ca;})
+#define DEF_CA	Label ca;
+#endif /* DIRECT_THREADED */
+#define NEXT_P1 ({cfa=*ip++; NEXT1_P1;})
+#define NEXT_P2 NEXT1_P2
+#endif /* CISC_NEXT */
 
 #define NEXT1 ({DEF_CA NEXT1_P1; NEXT1_P2;})
-#define NEXT ({DEF_CA NEXT_P1; NEXT1_P2;})
+#define NEXT ({DEF_CA NEXT_P1; NEXT_P2;})
 
 #ifdef USE_TOS
 #define IF_TOS(x) x
@@ -74,25 +87,75 @@ typedef struct F83Name {
 int emitcounter;
 #define NULLC '\0'
 
-#define cstr(to,from,size)\
-	{	memcpy(to,from,size);\
-		to[size]=NULLC;}
+char *cstr(Char *from, UCell size, int clear)
+/* if clear is true, scratch can be reused, otherwise we want more of
+   the same */
+{
+  static char *scratch=NULL;
+  static unsigned scratchsize=0;
+  static char *nextscratch;
+  char *oldnextscratch;
+
+  if (clear)
+    nextscratch=scratch;
+  if (scratch==NULL) {
+    scratch=malloc(size+1);
+    nextscratch=scratch;
+    scratchsize=size;
+  }
+  else if (nextscratch+size>scratch+scratchsize) {
+    char *oldscratch=scratch;
+    scratch = realloc(scratch, (nextscratch-scratch)+size+1);
+    nextscratch=scratch+(nextscratch-oldscratch);
+    scratchsize=size;
+  }
+  memcpy(nextscratch,from,size);
+  nextscratch[size]='\0';
+  oldnextscratch = nextscratch;
+  nextscratch += size+1;
+  return oldnextscratch;
+}
+
 #define NEWLINE	'\n'
 
+
 static char* fileattr[6]={"r","rb","r+","r+b","w+","w+b"};
 
+static Address up0=NULL;
+
+#if defined(i386) && defined(FORCE_REG)
+#  define REG(reg) __asm__(reg)
+
+Label *engine(Xt *ip0, Cell *sp0, Cell *rp, Float *fp, Address lp)
+{
+   register Xt *ip REG("%esi")=ip0;
+   register Cell *sp REG("%edi")=sp0;
+
+#else
+#  define REG(reg)
+
 Label *engine(Xt *ip, Cell *sp, Cell *rp, Float *fp, Address lp)
+{
+#endif
 /* executes code at ip, if ip!=NULL
    returns array of machine code labels (for use in a loader), if ip==NULL
 */
-{
-  Xt cfa;
-  Address up=NULL;
+  register Xt cfa
+#ifdef i386
+#  ifdef USE_TOS
+   REG("%ecx")
+#  else
+   REG("%edx")
+#  endif
+#endif
+   ;
+  Address up=up0;
   static Label symbols[]= {
     &&docol,
     &&docon,
     &&dovar,
     &&douser,
+    &&dodefer,
     &&dodoes,
     &&dodoes,  /* dummy for does handler address */
 #include "prim_labels.i"
@@ -105,7 +168,7 @@ Label *engine(Xt *ip, Cell *sp, Cell *rp
 
   if (ip == NULL)
     return symbols;
-  
+
   IF_TOS(TOS = sp[0]);
   IF_FTOS(FTOS = fp[0]);
   prep_terminal();
@@ -115,7 +178,7 @@ Label *engine(Xt *ip, Cell *sp, Cell *rp
 #ifdef DEBUG
   printf("%08x: col: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
 #endif
-#ifdef undefined
+#ifdef i386
   /* this is the simple version */
   *--rp = (Cell)ip;
   ip = (Xt *)PFA1(cfa);
@@ -173,6 +236,13 @@ Label *engine(Xt *ip, Cell *sp, Cell *rp
 #endif
   NEXT;
   
+ dodefer:
+#ifdef DEBUG
+  printf("%08x: defer: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
+#endif
+  cfa = *(Xt *)PFA1(cfa);
+  NEXT1;
+
  dodoes:
   /* this assumes the following structure:
      defining-word:
@@ -197,13 +267,13 @@ Label *engine(Xt *ip, Cell *sp, Cell *rp
 #endif
   *--rp = (Cell)ip;
   /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
+  ip = DOES_CODE1(cfa);
 #ifdef USE_TOS
   *sp-- = TOS;
   TOS = (Cell)PFA(cfa);
 #else
   *--sp = (Cell)PFA(cfa);
 #endif
-  ip = DOES_CODE1(cfa);
   NEXT;
   
 #include "primitives.i"