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Diff for /gforth/engine/threaded.h between versions 1.1 and 1.36

version 1.1, 1997/05/21 20:40:12 version 1.36, 2007/02/26 19:07:05
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 /* This file defines a number of threading schemes.  /* This file defines a number of threading schemes.
   
   Copyright (C) 1995, 1996 Free Software Foundation, Inc.    Copyright (C) 1995, 1996,1997,1999,2003,2004,2005 Free Software Foundation, Inc.
   
   This file is part of Gforth.    This file is part of Gforth.
   
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   You should have received a copy of the GNU General Public License    You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software    along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   
   
   This files defines macros for threading. Many sets of macros are    This files defines macros for threading. Many sets of macros are
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 */  */
   
 #ifndef GETCFA  #if !defined(GCC_PR15242_WORKAROUND)
 #  define CFA_NEXT  #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
   
 #ifdef DOUBLY_INDIRECT  
 #  define NEXT_P0       ({cfa=*ip;})  
 #  define IP            (ip)  
 #  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;})  
 #  define NEXT1_P1 ({ca = **cfa;})  
 #  define NEXT1_P2 ({goto *ca;})  
   
 #else /* !defined(DOUBLY_INDIRECT) */  
   
 #if defined(DIRECT_THREADED) && defined(AUTO_INCREMENT)\  
     && defined(LONG_LATENCY) && defined(CFA_NEXT)  
 #warning scheme 1  
 #  define NEXT_P0       ({cfa=*ip++;})  
 #  define IP            (ip-1)  
 #  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 defined(DIRECT_THREADED) && defined(AUTO_INCREMENT)\  
     && defined(LONG_LATENCY) && !defined(CFA_NEXT)  
 #warning scheme 2  
 #  define NEXT_P0       (ip++)  
 #  define IP            (ip-1)  
 #  define NEXT_INST     (*(ip-1))  
 #  define INC_IP(const_inc)     ({ ip+=(const_inc);})  
 #  define DEF_CA  
 #  define NEXT_P1  
 #  define NEXT_P2       ({goto **(ip-1);})  
 #  define EXEC(XT)      ({goto *(XT);})  
 #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
   
 #if defined(DIRECT_THREADED) && defined(AUTO_INCREMENT)\  
     && !defined(LONG_LATENCY) && defined(CFA_NEXT)  
 #warning scheme 3  
 #  define NEXT_P0  
 #  define IP            (ip)  
 #  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 defined(DIRECT_THREADED) && defined(AUTO_INCREMENT)\  
     && !defined(LONG_LATENCY) && !defined(CFA_NEXT)  
 #warning scheme 4  
 #  define NEXT_P0  
 #  define IP            (ip)  
 #  define NEXT_INST     (*ip)  
 #  define INC_IP(const_inc)     ({ ip+=(const_inc);})  
 #  define DEF_CA  
 #  define NEXT_P1  
 #  define NEXT_P2       ({goto **(ip++);})  
 #  define EXEC(XT)      ({goto *(XT);})  
 #endif  
   
 /* without autoincrement */  
   
 #if defined(DIRECT_THREADED) && !defined(AUTO_INCREMENT)\  #ifdef DOUBLY_INDIRECT
     && defined(LONG_LATENCY) && defined(CFA_NEXT)  # ifndef DEBUG_DITC
 #warning scheme 5  #  define DEBUG_DITC 0
 #  define NEXT_P0       ({cfa=*ip;})  # endif
   /* define to 1 if you want to check consistency */
   #  define NEXT_P0       do {cfa1=cfa; cfa=*ip;} while(0)
   #  define CFA           cfa1
   #  define MORE_VARS     Xt cfa1;
 #  define IP            (ip)  #  define IP            (ip)
   #  define SET_IP(p)     do {ip=(p); cfa=*ip;} while(0)
 #  define NEXT_INST     (cfa)  #  define NEXT_INST     (cfa)
 #  define INC_IP(const_inc)     ({cfa=IP[const_inc]; ip+=(const_inc);})  #  define INC_IP(const_inc)     do {cfa=IP[const_inc]; ip+=(const_inc);} while(0)
 #  define DEF_CA  #  define DEF_CA        Label ca;
 #  define NEXT_P1       (ip++)  #  define NEXT_P1       do {\
 #  define NEXT_P2       ({goto *cfa;})    if (DEBUG_DITC && (cfa<=vm_prims+DOESJUMP || cfa>=vm_prims+npriminfos)) \
 #  define EXEC(XT)      ({cfa=(XT); goto *cfa;})      fprintf(stderr,"NEXT encountered prim %p at ip=%p\n", cfa, ip); \
 #endif    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+DOESJUMP && 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; 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_P1_5               do {goto *next_code;} while(0)
   /* set next_code to the return address before performing EXEC */
   /* 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) */
   
   #if defined(DIRECT_THREADED)
   
   /* This lets the compiler know that cfa is dead before; we place it at
      "goto *"s that perform direct threaded dispatch (i.e., not EXECUTE
      etc.), and thus do not reach doers, which would use cfa; the only
      way to a doer is through EXECUTE etc., which set the cfa
      themselves.
   
      Some of these direct threaded schemes use "cfa" to hold the code
      address in normal direct threaded code.  Of course we cannot use
      KILLS there.
   
 #if defined(DIRECT_THREADED) && !defined(AUTO_INCREMENT)\     KILLS works by having an empty asm instruction, and claiming to the
     && defined(LONG_LATENCY) && !defined(CFA_NEXT)     compiler that it writes to cfa.
 #warning scheme 6  
 #  define NEXT_P0  
 #  define IP            (ip)  
 #  define NEXT_INST     (*ip)  
 #  define INC_IP(const_inc)     ({ip+=(const_inc);})  
 #  define DEF_CA  
 #  define NEXT_P1       (ip++)  
 #  define NEXT_P2       ({goto **(ip-1);})  
 #  define EXEC(XT)      ({goto *(XT);})  
 #endif  
   
      KILLS is optional.  You can write
   
 #if defined(DIRECT_THREADED) && !defined(AUTO_INCREMENT)\  #define KILLS
     && !defined(LONG_LATENCY) && defined(CFA_NEXT)  
 #warning scheme 7  
 #  define NEXT_P0  
 #  define IP            (ip)  
 #  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 defined(DIRECT_THREADED) && !defined(AUTO_INCREMENT)\     and lose just a little performance.
     && !defined(LONG_LATENCY) && !defined(CFA_NEXT)  */
 #warning scheme 8  #define KILLS asm("":"=X"(cfa));
   
   #warning direct threading scheme 8: cfa dead, i386 hack
 #  define NEXT_P0  #  define NEXT_P0
   #  define CFA           cfa
 #  define IP            (ip)  #  define IP            (ip)
   #  define SET_IP(p)     do {ip=(p); NEXT_P0;} while(0)
 #  define NEXT_INST     (*IP)  #  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 DEF_CA
 #  define NEXT_P1       (ip++)  #  define NEXT_P1       (ip++)
 #  define NEXT_P2       ({goto **(ip-1);})  #  define NEXT_P1_5     do {KILLS GOTO(*(ip-1));} while(0)
 #  define EXEC(XT)      ({goto *(XT);})  #  define EXEC1(XT)     ({cfa=(XT); *cfa;})
 #endif  
   
 /* common settings for direct THREADED */  
   
   
   /* direct threaded */
   #else
 /* indirect THREADED  */  /* indirect THREADED  */
   
 #if !defined(DIRECT_THREADED) && defined(AUTO_INCREMENT)\  #warning indirect threading scheme 8: low latency,cisc
     && defined(LONG_LATENCY) && defined(CISC_NEXT)  
 #  define NEXT_P0       ({cfa=*ip++;})  
 #  define IP            (ip-1)  
 #  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 !defined(DIRECT_THREADED) && defined(AUTO_INCREMENT)\  
     && defined(LONG_LATENCY) && !defined(CISC_NEXT)  
 #  define NEXT_P0       ({cfa=*ip++;})  
 #  define IP            (ip-1)  
 #  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 !defined(DIRECT_THREADED) && defined(AUTO_INCREMENT)\  
     && !defined(LONG_LATENCY) && defined(CISC_NEXT)  
 #  define NEXT_P0  #  define NEXT_P0
   #  define CFA           cfa
 #  define IP            (ip)  #  define IP            (ip)
   #  define SET_IP(p)     do {ip=(p); NEXT_P0;} while(0)
 #  define NEXT_INST     (*ip)  #  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 DEF_CA
 #  define NEXT_P1  #  define NEXT_P1
 #  define NEXT_P2       ({cfa=*ip++; goto **cfa;})  #  define NEXT_P1_5     do {cfa=*ip++; GOTO(*cfa);} while(0)
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  #  define EXEC1(XT)     ({cfa=(XT); *cfa;})
 #endif  
   
 #if !defined(DIRECT_THREADED) && defined(AUTO_INCREMENT)\  /* indirect threaded */
     && !defined(LONG_LATENCY) && !defined(CISC_NEXT)  
 #  define NEXT_P0       ({cfa=*ip++;})  
 #  define IP            (ip-1)  
 #  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  #endif
   
   #endif /* !defined(DOUBLY_INDIRECT) && !defined(NO_IP) */
 /* without autoincrement */  
   
 #if !defined(DIRECT_THREADED) && !defined(AUTO_INCREMENT)\  
     && defined(LONG_LATENCY) && defined(CISC_NEXT)  
 #  define NEXT_P0       ({cfa=*ip;})  
 #  define IP            (ip)  
 #  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 !defined(DIRECT_THREADED) && !defined(AUTO_INCREMENT)\  
     && defined(LONG_LATENCY) && !defined(CISC_NEXT)  
 #  define NEXT_P0       ({cfa=*ip;})  
 #  define IP            (ip)  
 #  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 !defined(DIRECT_THREADED) && !defined(AUTO_INCREMENT)\  
     && !defined(LONG_LATENCY) && defined(CISC_NEXT)  
 #  define NEXT_P0  
 #  define IP            (ip)  
 #  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  
   
 #if !defined(DIRECT_THREADED) && !defined(AUTO_INCREMENT)\  
     && !defined(LONG_LATENCY) && !defined(CISC_NEXT)  
 #  define NEXT_P0       ({cfa=*ip;})  
 #  define IP            (ip)  
 #  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 defined(CISC_NEXT) && !defined(LONG_LATENCY)  
 # define NEXT1_P1  
 # ifdef DIRECT_THREADED  
 #  define NEXT1_P2 ({goto *cfa;})  
 # else  
 #  define NEXT1_P2 ({goto **cfa;})  
 # endif /* DIRECT_THREADED */  
 #else /* !defined(CISC_NEXT) || defined(LONG_LATENCY) */  
 # ifdef DIRECT_THREADED  
 #  define NEXT1_P1  
 #  define NEXT1_P2 ({goto *cfa;})  
 # else /* !DIRECT_THREADED */  
 #  define NEXT1_P1 ({ca = *cfa;})  
 #  define NEXT1_P2 ({goto *ca;})  
 # endif /* !DIRECT_THREADED */  
 #endif /* !defined(CISC_NEXT) || defined(LONG_LATENCY) */  
   
 #endif /* !defined(DOUBLY_INDIRECT) */  
   
 #define NEXT ({DEF_CA NEXT_P1; NEXT_P2;})  
   
Removed from v.1.1  
changed lines
  Added in v.1.36

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