--- gforth/engine/threaded.h	2003/03/09 15:17:04	1.22
+++ gforth/engine/threaded.h	2010/12/31 18:09:02	1.42
@@ -1,12 +1,12 @@
 /* This file defines a number of threading schemes.
 
-  Copyright (C) 1995, 1996,1997,1999,2003 Free Software Foundation, Inc.
+  Copyright (C) 1995, 1996,1997,1999,2003,2004,2005,2007,2008,2010 Free Software Foundation, Inc.
 
   This file is part of Gforth.
 
   Gforth is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
-  as published by the Free Software Foundation; either version 2
+  as published by the Free Software Foundation, either version 3
   of the License, or (at your option) any later version.
 
   This program is distributed in the hope that it will be useful,
@@ -15,8 +15,7 @@
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
-  along with this program; if not, write to the Free Software
-  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
+  along with this program; if not, see http://www.gnu.org/licenses/.
 
 
   This files defines macros for threading. Many sets of macros are
@@ -91,37 +90,76 @@
 
 */
 
+#if !defined(GCC_PR15242_WORKAROUND)
+#if __GNUC__ == 3
+/* various gcc-3.x version have problems (including PR15242) that are
+   solved with this workaround */
+#define GCC_PR15242_WORKAROUND 1
+#else
+/* other gcc versions are better off without the workaround for
+   primitives that are not relocatable */
+#define GCC_PR15242_WORKAROUND 0
+#endif
+#endif
+
+#if GCC_PR15242_WORKAROUND
+#define DO_GOTO goto before_goto
+#else
+#define DO_GOTO goto *real_ca
+#endif
+
+#ifndef GOTO_ALIGN
+#define GOTO_ALIGN
+#endif
+
+#define GOTO(target) do {(real_ca=(target));} while(0)
+#define NEXT_P2 do {NEXT_P1_5; DO_GOTO;} while(0)
+#define EXEC(XT) do { real_ca=EXEC1(XT); DO_GOTO;} while (0)
+#define VM_JUMP(target) do {GOTO(target);} while (0)
+#define NEXT do {DEF_CA NEXT_P1; NEXT_P2;} while(0)
+#define FIRST_NEXT_P2 NEXT_P1_5; GOTO_ALIGN; \
+before_goto: goto *real_ca; after_goto:
+#define FIRST_NEXT do {DEF_CA NEXT_P1; FIRST_NEXT_P2;} while(0)
+#define IPTOS NEXT_INST
+
+
 #ifdef DOUBLY_INDIRECT
 # ifndef DEBUG_DITC
 #  define DEBUG_DITC 0
 # endif
 /* define to 1 if you want to check consistency */
-#  define NEXT_P0	({cfa=*ip;})
-#  define IP		(ip)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(cfa)
-#  define INC_IP(const_inc)	({cfa=IP[const_inc]; ip+=(const_inc);})
-#  define DEF_CA	Label ca;
-#  define NEXT_P1	({\
-  if (DEBUG_DITC && (cfa<=vm_prims+DOESJUMP || cfa>=vm_prims+npriminfos)) \
+#  define NEXT_P0	do {cfa1=cfa; cfa=*ip;} while(0)
+#  define CFA		cfa1
+#  define MORE_VARS     Xt cfa1;
+#  define IP		(ip)
+#  define SET_IP(p)	do {ip=(p); cfa=*ip;} while(0)
+#  define NEXT_INST	(cfa)
+#  define INC_IP(const_inc)	do {cfa=IP[const_inc]; ip+=(const_inc);} while(0)
+#  define DEF_CA	Label MAYBE_UNUSED ca;
+#  define NEXT_P1	do {\
+  if (DEBUG_DITC && (cfa<=vm_prims+DOER_MAX || cfa>=vm_prims+npriminfos)) \
     fprintf(stderr,"NEXT encountered prim %p at ip=%p\n", cfa, ip); \
-  ip++;})
-#  define NEXT_P2	({ca=**cfa; goto *ca;})
-#  define EXEC(XT)	({DEF_CA cfa=(XT);\
-  if (DEBUG_DITC && (cfa>vm_prims+DOESJUMP && cfa<vm_prims+npriminfos)) \
+  ip++;} while(0)
+#  define NEXT_P1_5	do {ca=**cfa; GOTO(ca);} while(0)
+#  define EXEC1(XT)	({DEF_CA cfa=(XT);\
+  if (DEBUG_DITC && (cfa>vm_prims+DOER_MAX && cfa<vm_prims+npriminfos)) \
     fprintf(stderr,"EXEC encountered xt %p at ip=%p, vm_prims=%p, xts=%p\n", cfa, ip, vm_prims, xts); \
- ca=**cfa; goto *ca;})
+ ca=**cfa; ca;})
 
 #elif defined(NO_IP)
 
 #define NEXT_P0
+#  define CFA		cfa
 #define SET_IP(target)	assert(0)
 #define INC_IP(n)	((void)0)
 #define DEF_CA
 #define NEXT_P1
-#define NEXT_P2		({goto *next_code;})
+#define NEXT_P1_5		do {goto *next_code;} while(0)
 /* set next_code to the return address before performing EXEC */
-#define EXEC(XT)	({cfa=(XT); goto **cfa;})
+/* original: */
+/* #define EXEC1(XT)	do {cfa=(XT); goto **cfa;} while(0) */
+/* fake, to make syntax check work */
+#define EXEC1(XT)	({cfa=(XT); *cfa;})
 
 #else  /* !defined(DOUBLY_INDIRECT) && !defined(NO_IP) */
 
@@ -148,264 +186,36 @@
 */
 #define KILLS asm("":"=X"(cfa));
 
-#ifndef THREADING_SCHEME
-#define THREADING_SCHEME 6
-#endif
-
-#if THREADING_SCHEME==1
-#warning direct threading scheme 1: autoinc, long latency, cfa live
-#  define NEXT_P0	({cfa=*ip++;})
-#  define IP		(ip-1)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(cfa)
-#  define INC_IP(const_inc)	({cfa=IP[const_inc]; ip+=(const_inc);})
-#  define DEF_CA
-#  define NEXT_P1
-#  define NEXT_P2	({goto *cfa;})
-#  define EXEC(XT)	({cfa=(XT); goto **cfa;})
-#endif
-
-#if THREADING_SCHEME==2
-#warning direct threading scheme 2: autoinc, long latency, cfa dead
-#  define NEXT_P0	(ip++)
-#  define IP		(ip-1)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(*(ip-1))
-#  define INC_IP(const_inc)	({ ip+=(const_inc);})
-#  define DEF_CA
-#  define NEXT_P1
-#  define NEXT_P2	({KILLS goto **(ip-1);})
-#  define EXEC(XT)	({cfa=(XT); goto **cfa;})
-#endif
-
-
-#if THREADING_SCHEME==3
-#warning direct threading scheme 3: autoinc, low latency, cfa live
-#  define NEXT_P0
-#  define IP		(ip)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(*ip)
-#  define INC_IP(const_inc)	({ip+=(const_inc);})
-#  define DEF_CA
-#  define NEXT_P1	({cfa=*ip++;})
-#  define NEXT_P2	({goto *cfa;})
-#  define EXEC(XT)	({cfa=(XT); goto **cfa;})
-#endif
-
-#if THREADING_SCHEME==4
-#warning direct threading scheme 4: autoinc, low latency, cfa dead
-#  define NEXT_P0
-#  define IP		(ip)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(*ip)
-#  define INC_IP(const_inc)	({ ip+=(const_inc);})
-#  define DEF_CA
-#  define NEXT_P1
-#  define NEXT_P2	({KILLS goto **(ip++);})
-#  define EXEC(XT)	({cfa=(XT); goto **cfa;})
-#endif
-
-#if THREADING_SCHEME==5
-#warning direct threading scheme 5: long latency, cfa live
-#  define NEXT_P0	({cfa=*ip;})
-#  define IP		(ip)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(cfa)
-#  define INC_IP(const_inc)	({cfa=IP[const_inc]; ip+=(const_inc);})
-#  define DEF_CA
-#  define NEXT_P1	(ip++)
-#  define NEXT_P2	({goto *cfa;})
-#  define EXEC(XT)	({cfa=(XT); goto **cfa;})
-#endif
-
-#if THREADING_SCHEME==6
-#warning direct threading scheme 6: long latency, cfa dead
-#  define NEXT_P0
-#  define IP		(ip)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(*ip)
-#  define INC_IP(const_inc)	({ip+=(const_inc);})
-#  define DEF_CA
-#  define NEXT_P1	(ip++)
-#  define NEXT_P2	({KILLS goto **(ip-1);})
-#  define EXEC(XT)	({cfa=(XT); goto **cfa;})
-#endif
-
-
-#if THREADING_SCHEME==7
-#warning direct threading scheme 7: low latency, cfa live
-#  define NEXT_P0
-#  define IP		(ip)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(*ip)
-#  define INC_IP(const_inc)	({ip+=(const_inc);})
-#  define DEF_CA
-#  define NEXT_P1	({cfa=*ip++;})
-#  define NEXT_P2	({goto *cfa;})
-#  define EXEC(XT)	({cfa=(XT); goto **cfa;})
-#endif
-
-#if THREADING_SCHEME==8
-#warning direct threading scheme 8: cfa dead, i386 hack
+/* #warning direct threading scheme 8: cfa dead, i386 hack */
 #  define NEXT_P0
+#  define CFA		cfa
 #  define IP		(ip)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
+#  define SET_IP(p)	do {ip=(p); NEXT_P0;} while(0)
 #  define NEXT_INST	(*IP)
-#  define INC_IP(const_inc)	({ ip+=(const_inc);})
+#  define INC_IP(const_inc)	do { ip+=(const_inc);} while(0)
 #  define DEF_CA
 #  define NEXT_P1	(ip++)
-#  define NEXT_P2	({KILLS goto **(ip-1);})
-#  define EXEC(XT)	({cfa=(XT); goto **cfa;})
-#endif
-
-#if THREADING_SCHEME==9
-#warning direct threading scheme 9: Power/PPC hack, long latency
-/* Power uses a prepare-to-branch instruction, and the latency between
-   this inst and the branch is 5 cycles on a PPC604; so we utilize this
-   to do some prefetching in between */
-#  define NEXT_P0
-#  define IP		ip
-#  define SET_IP(p)	({ip=(p); next_cfa=*ip; NEXT_P0;})
-#  define NEXT_INST	(next_cfa)
-#  define INC_IP(const_inc)	({next_cfa=IP[const_inc]; ip+=(const_inc);})
-#  define DEF_CA	
-#  define NEXT_P1	({cfa=next_cfa; ip++; next_cfa=*ip;})
-#  define NEXT_P2	({goto *cfa;})
-#  define EXEC(XT)	({cfa=(XT); goto **cfa;})
-#  define MORE_VARS	Xt next_cfa;
-#endif
-
-#if THREADING_SCHEME==10
-#warning direct threading scheme 10: plain (no attempt at scheduling)
-#  define NEXT_P0
-#  define IP		(ip)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(*ip)
-#  define INC_IP(const_inc)	({ip+=(const_inc);})
-#  define DEF_CA
-#  define NEXT_P1
-#  define NEXT_P2	({cfa=*ip++; goto *cfa;})
-#  define EXEC(XT)	({cfa=(XT); goto **cfa;})
-#endif
+#  define NEXT_P1_5	do {KILLS GOTO(*(ip-1));} while(0)
+#  define EXEC1(XT)	({cfa=(XT); *cfa;})
 
 /* direct threaded */
 #else
 /* indirect THREADED  */
 
-#ifndef THREADING_SCHEME
-#define THREADING_SCHEME 6
-#endif
-
-#if THREADING_SCHEME==1
-#warning indirect threading scheme 1: autoinc, long latency, cisc
-#  define NEXT_P0	({cfa=*ip++;})
-#  define IP		(ip-1)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(cfa)
-#  define INC_IP(const_inc)	({cfa=IP[const_inc]; ip+=(const_inc);})
-#  define DEF_CA
-#  define NEXT_P1
-#  define NEXT_P2	({goto **cfa;})
-#  define EXEC(XT)	({cfa=(XT); goto **cfa;})
-#endif
-
-#if THREADING_SCHEME==2
-#warning indirect threading scheme 2: autoinc, long latency
-#  define NEXT_P0	({cfa=*ip++;})
-#  define IP		(ip-1)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(cfa)
-#  define INC_IP(const_inc)	({cfa=IP[const_inc]; ip+=(const_inc);})
-#  define DEF_CA	Label ca;
-#  define NEXT_P1	({ca=*cfa;})
-#  define NEXT_P2	({goto *ca;})
-#  define EXEC(XT)	({DEF_CA cfa=(XT); ca=*cfa; goto *ca;})
-#endif
-
-
-#if THREADING_SCHEME==3
-#warning indirect threading scheme 3: autoinc, low latency, cisc
+/* #warning indirect threading scheme 8: low latency,cisc */
 #  define NEXT_P0
+#  define CFA		cfa
 #  define IP		(ip)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
+#  define SET_IP(p)	do {ip=(p); NEXT_P0;} while(0)
 #  define NEXT_INST	(*ip)
-#  define INC_IP(const_inc)	({ip+=(const_inc);})
+#  define INC_IP(const_inc)	do {ip+=(const_inc);} while(0)
 #  define DEF_CA
 #  define NEXT_P1
-#  define NEXT_P2	({cfa=*ip++; goto **cfa;})
-#  define EXEC(XT)	({cfa=(XT); goto **cfa;})
-#endif
-
-#if THREADING_SCHEME==4
-#warning indirect threading scheme 4: autoinc, low latency
-#  define NEXT_P0	({cfa=*ip++;})
-#  define IP		(ip-1)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(cfa)
-#  define INC_IP(const_inc)	({cfa=IP[const_inc]; ip+=(const_inc);})
-#  define DEF_CA	Label ca;
-#  define NEXT_P1	({ca=*cfa;})
-#  define NEXT_P2	({goto *ca;})
-#  define EXEC(XT)	({DEF_CA cfa=(XT); ca=*cfa; goto *ca;})
-#endif
-
-
-#if THREADING_SCHEME==5
-#warning indirect threading scheme 5: long latency, cisc
-#  define NEXT_P0	({cfa=*ip;})
-#  define IP		(ip)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(cfa)
-#  define INC_IP(const_inc)	({cfa=IP[const_inc]; ip+=(const_inc);})
-#  define DEF_CA
-#  define NEXT_P1	(ip++)
-#  define NEXT_P2	({goto **cfa;})
-#  define EXEC(XT)	({cfa=(XT); goto **cfa;})
-#endif
-
-#if THREADING_SCHEME==6
-#warning indirect threading scheme 6: long latency
-#  define NEXT_P0	({cfa=*ip;})
-#  define IP		(ip)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(cfa)
-#  define INC_IP(const_inc)	({cfa=IP[const_inc]; ip+=(const_inc);})
-#  define DEF_CA	Label ca;
-#  define NEXT_P1	({ip++; ca=*cfa;})
-#  define NEXT_P2	({goto *ca;})
-#  define EXEC(XT)	({DEF_CA cfa=(XT); ca=*cfa; goto *ca;})
-#endif
-
-#if THREADING_SCHEME==7
-#warning indirect threading scheme 7: low latency
-#  define NEXT_P0	({cfa=*ip;})
-#  define IP		(ip)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(cfa)
-#  define INC_IP(const_inc)	({cfa=IP[const_inc]; ip+=(const_inc);})
-#  define DEF_CA	Label ca;
-#  define NEXT_P1	({ip++; ca=*cfa;})
-#  define NEXT_P2	({goto *ca;})
-#  define EXEC(XT)	({DEF_CA cfa=(XT); ca=*cfa; goto *ca;})
-#endif
-
-#if THREADING_SCHEME==8
-#warning indirect threading scheme 8: low latency,cisc
-#  define NEXT_P0
-#  define IP		(ip)
-#  define SET_IP(p)	({ip=(p); NEXT_P0;})
-#  define NEXT_INST	(*ip)
-#  define INC_IP(const_inc)	({ip+=(const_inc);})
-#  define DEF_CA
-#  define NEXT_P1
-#  define NEXT_P2	({cfa=*ip++; goto **cfa;})
-#  define EXEC(XT)	({cfa=(XT); goto **cfa;})
-#endif
+#  define NEXT_P1_5	do {cfa=*ip++; GOTO(*cfa);} while(0)
+#  define EXEC1(XT)	({cfa=(XT); *cfa;})
 
 /* indirect threaded */
 #endif
 
 #endif /* !defined(DOUBLY_INDIRECT) && !defined(NO_IP) */
 
-#define NEXT ({DEF_CA NEXT_P1; NEXT_P2;})
-#define IPTOS NEXT_INST