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Diff for /gforth/engine/threaded.h between versions 1.14 and 1.42

version 1.14, 2002/01/16 10:40:26 version 1.42, 2010/12/31 18:09:02
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 /* This file defines a number of threading schemes.  /* This file defines a number of threading schemes.
   
   Copyright (C) 1995, 1996,1997,1999 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.    This file is part of Gforth.
   
   Gforth is free software; you can redistribute it and/or    Gforth is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License    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.    of the License, or (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,    This program is distributed in the hope that it will be useful,
Line 15 Line 15
   GNU General Public License for more details.    GNU General Public License for more details.
   
   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, see http://www.gnu.org/licenses/.
   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
Line 91 Line 90
   
 */  */
   
 /* CFA_NEXT: if NEXT uses cfa, you have to #define CFA_NEXT, to get  #if !defined(GCC_PR15242_WORKAROUND)
  * cfa declared in engine.  #if __GNUC__ == 3
  */  /* various gcc-3.x version have problems (including PR15242) that are
      solved with this workaround */
 #ifdef DOUBLY_INDIRECT  #define GCC_PR15242_WORKAROUND 1
 #  define CFA_NEXT  #else
 #  define NEXT_P0       ({cfa=*ip;})  /* other gcc versions are better off without the workaround for
 #  define IP            (ip)     primitives that are not relocatable */
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  #define GCC_PR15242_WORKAROUND 0
 #  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 (cfa<=vm_prims+DOESJUMP || cfa>=vm_prims+npriminfos) \  
     fprintf(stderr,"NEXT encountered prim %p at ip=%p\n", cfa, ip); \  
   ip++; ca=**cfa;})  
 #  define NEXT_P2       ({goto *ca;})  
 #  define EXEC(XT)      ({DEF_CA cfa=(XT);\  
   if (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; goto *ca;})  
   
 #else /* !defined(DOUBLY_INDIRECT) */  
   
 #if defined(DIRECT_THREADED)  
   
 /* note that the "cfa dead" versions only work if GETCFA exists and works */  
   
 #if THREADING_SCHEME==1  
 #warning direct threading scheme 1: autoinc, long latency, cfa live  
 #  define CFA_NEXT  
 #  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  
 #ifndef GETCFA  
 #error GETCFA must be defined for cfa dead threading  
 #endif  
 #  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       ({goto **(ip-1);})  
 #  define EXEC(XT)      ({goto *(XT);})  
 #endif  #endif
   
   
 #if THREADING_SCHEME==3  
 #warning direct threading scheme 3: autoinc, low latency, cfa live  
 #  define CFA_NEXT  
 #  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  #endif
   
 #if THREADING_SCHEME==4  #if GCC_PR15242_WORKAROUND
 #warning direct threading scheme 4: autoinc, low latency, cfa dead  #define DO_GOTO goto before_goto
 #ifndef GETCFA  #else
 #error GETCFA must be defined for cfa dead threading  #define DO_GOTO goto *real_ca
 #endif  
 #  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       ({goto **(ip++);})  
 #  define EXEC(XT)      ({goto *(XT);})  
 #endif  #endif
   
 #if THREADING_SCHEME==5  #ifndef GOTO_ALIGN
 #warning direct threading scheme 5: long latency, cfa live  #define GOTO_ALIGN
 #  define CFA_NEXT  
 #  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  #endif
   
 #if THREADING_SCHEME==6  #define GOTO(target) do {(real_ca=(target));} while(0)
 #warning direct threading scheme 6: long latency, cfa dead  #define NEXT_P2 do {NEXT_P1_5; DO_GOTO;} while(0)
 #ifndef GETCFA  #define EXEC(XT) do { real_ca=EXEC1(XT); DO_GOTO;} while (0)
 #error GETCFA must be defined for cfa dead threading  #define VM_JUMP(target) do {GOTO(target);} while (0)
 #endif  #define NEXT do {DEF_CA NEXT_P1; NEXT_P2;} while(0)
 #  define NEXT_P0  #define FIRST_NEXT_P2 NEXT_P1_5; GOTO_ALIGN; \
 #  define IP            (ip)  before_goto: goto *real_ca; after_goto:
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  #define FIRST_NEXT do {DEF_CA NEXT_P1; FIRST_NEXT_P2;} while(0)
 #  define NEXT_INST     (*ip)  #define IPTOS NEXT_INST
 #  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  
   
   
 #if THREADING_SCHEME==7  #ifdef DOUBLY_INDIRECT
 #warning direct threading scheme 7: low latency, cfa live  # ifndef DEBUG_DITC
 #  define CFA_NEXT  #  define DEBUG_DITC 0
 #  define NEXT_P0  # endif
 #  define IP            (ip)  /* define to 1 if you want to check consistency */
 #  define SET_IP(p)     ({ip=(p); NEXT_P0;})  #  define NEXT_P0       do {cfa1=cfa; cfa=*ip;} while(0)
 #  define NEXT_INST     (*ip)  #  define CFA           cfa1
 #  define INC_IP(const_inc)     ({ip+=(const_inc);})  #  define MORE_VARS     Xt cfa1;
 #  define DEF_CA  #  define IP            (ip)
 #  define NEXT_P1       ({cfa=*ip++;})  #  define SET_IP(p)     do {ip=(p); cfa=*ip;} while(0)
 #  define NEXT_P2       ({goto *cfa;})  #  define NEXT_INST     (cfa)
 #  define EXEC(XT)      ({cfa=(XT); goto *cfa;})  #  define INC_IP(const_inc)     do {cfa=IP[const_inc]; ip+=(const_inc);} while(0)
 #endif  #  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++;} 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; ca;})
   
 #if THREADING_SCHEME==8  #elif defined(NO_IP)
 #warning direct threading scheme 8: cfa dead, i386 hack  
 #ifndef GETCFA  
 #error GETCFA must be defined for cfa dead threading  
 #endif  
 #  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       ({goto **(ip-1);})  
 #  define EXEC(XT)      ({goto *(XT);})  
 #endif  
   
 #if THREADING_SCHEME==9  #define NEXT_P0
 #warning direct threading scheme 9: Power/PPC hack, long latency  #  define CFA           cfa
 /* Power uses a prepare-to-branch instruction, and the latency between  #define SET_IP(target)  assert(0)
    this inst and the branch is 5 cycles on a PPC604; so we utilize this  #define INC_IP(n)       ((void)0)
    to do some prefetching in between */  #define DEF_CA
 #  define CFA_NEXT  #define NEXT_P1
 #  define NEXT_P0  #define NEXT_P1_5               do {goto *next_code;} while(0)
 #  define IP            ip  /* set next_code to the return address before performing EXEC */
 #  define SET_IP(p)     ({ip=(p); next_cfa=*ip; NEXT_P0;})  /* original: */
 #  define NEXT_INST     (next_cfa)  /* #define EXEC1(XT)    do {cfa=(XT); goto **cfa;} while(0) */
 #  define INC_IP(const_inc)     ({next_cfa=IP[const_inc]; ip+=(const_inc);})  /* fake, to make syntax check work */
 #  define DEF_CA          #define EXEC1(XT)       ({cfa=(XT); *cfa;})
 #  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  #else  /* !defined(DOUBLY_INDIRECT) && !defined(NO_IP) */
 #warning direct threading scheme 10: plain (no attempt at scheduling)  
 #  define CFA_NEXT  
 #  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  
   
 /* direct threaded */  #if defined(DIRECT_THREADED)
 #else  
 /* indirect THREADED  */  
   
 #if THREADING_SCHEME==1  /* This lets the compiler know that cfa is dead before; we place it at
 #warning indirect threading scheme 1: autoinc, long latency, cisc     "goto *"s that perform direct threaded dispatch (i.e., not EXECUTE
 #  define CFA_NEXT     etc.), and thus do not reach doers, which would use cfa; the only
 #  define NEXT_P0       ({cfa=*ip++;})     way to a doer is through EXECUTE etc., which set the cfa
 #  define IP            (ip-1)     themselves.
 #  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     Some of these direct threaded schemes use "cfa" to hold the code
 #warning indirect threading scheme 2: autoinc, long latency     address in normal direct threaded code.  Of course we cannot use
 #  define CFA_NEXT     KILLS there.
 #  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  
   
      KILLS works by having an empty asm instruction, and claiming to the
      compiler that it writes to cfa.
   
 #if THREADING_SCHEME==3     KILLS is optional.  You can write
 #warning indirect threading scheme 3: autoinc, low latency, cisc  
 #  define CFA_NEXT  
 #  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  
   
 #if THREADING_SCHEME==4  #define KILLS
 #warning indirect threading scheme 4: autoinc, low latency  
 #  define CFA_NEXT  
 #  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  
   
      and lose just a little performance.
   */
   #define KILLS asm("":"=X"(cfa));
   
 #if THREADING_SCHEME==5  /* #warning direct threading scheme 8: cfa dead, i386 hack */
 #warning indirect threading scheme 5: long latency, cisc  #  define NEXT_P0
 #  define CFA_NEXT  #  define CFA           cfa
 #  define NEXT_P0       ({cfa=*ip;})  
 #  define IP            (ip)  #  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     (cfa)  #  define NEXT_INST     (*IP)
 #  define INC_IP(const_inc)     ({cfa=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 **cfa;})  #  define NEXT_P1_5     do {KILLS GOTO(*(ip-1));} while(0)
 #  define EXEC(XT)      ({cfa=(XT); goto **cfa;})  #  define EXEC1(XT)     ({cfa=(XT); *cfa;})
 #endif  
   
 #if THREADING_SCHEME==6  /* direct threaded */
 #warning indirect threading scheme 6: long latency  #else
 #  define CFA_NEXT  /* indirect THREADED  */
 #  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 CFA_NEXT  
 #  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 */
 #warning indirect threading scheme 8: low latency,cisc  
 #  define CFA_NEXT  
 #  define NEXT_P0  #  define NEXT_P0
   #  define CFA           cfa
 #  define IP            (ip)  #  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 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  
   
 /* indirect threaded */  /* indirect threaded */
 #endif  #endif
   
 #endif /* !defined(DOUBLY_INDIRECT) */  #endif /* !defined(DOUBLY_INDIRECT) && !defined(NO_IP) */
   
 #define NEXT ({DEF_CA NEXT_P1; NEXT_P2;})  
 #define IPTOS NEXT_INST  
Removed from v.1.14  
changed lines
  Added in v.1.42

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