File:  [gforth] / gforth / vmgen-ex / mini-inst.vmg
Revision 1.6: download - view: text, annotated - select for diffs
Mon Dec 31 19:02:25 2007 UTC (11 years, 10 months ago) by anton
Branches: MAIN
CVS tags: v0-7-0, HEAD
updated copyright year after changing license notice

    1: \ mini.inst is generated automatically from mini-inst.vmg and mini-super.vmg
    2: \ example .vmg file
    3: 
    4: \ Copyright (C) 2001,2002,2003,2007 Free Software Foundation, Inc.
    5: 
    6: \ This file is part of Gforth.
    7: 
    8: \ Gforth is free software; you can redistribute it and/or
    9: \ modify it under the terms of the GNU General Public License
   10: \ as published by the Free Software Foundation, either version 3
   11: \ of the License, or (at your option) any later version.
   12: 
   13: \ This program is distributed in the hope that it will be useful,
   14: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   15: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   16: \ GNU General Public License for more details.
   17: 
   18: \ You should have received a copy of the GNU General Public License
   19: \ along with this program. If not, see http://www.gnu.org/licenses/.
   20: 
   21: 
   22: \ WARNING: This file is processed by m4. Make sure your identifiers
   23: \ don't collide with m4's (e.g. by undefining them).
   24: 
   25: 
   26: \ comments start with "\ "
   27: 
   28: \ stack definitions:
   29: \E stack data-stack sp Cell
   30: 
   31: \ stack prefix definitions
   32: \E inst-stream stack-prefix #
   33: 
   34: \ type prefix definitions:
   35: \E s" Cell"   single data-stack type-prefix i
   36: \E s" char *" single data-stack type-prefix a
   37: \E s" Inst *" single data-stack type-prefix target
   38: 
   39: \ simple VM instructions:
   40: add ( i1 i2 -- i )
   41: i = i1+i2;
   42: 
   43: sub ( i1 i2 -- i )
   44: i = i1-i2;
   45: 
   46: mul ( i1 i2 -- i )
   47: i = i1*i2;
   48: 
   49: and ( i1 i2 -- i )
   50: i = i1 & i2;
   51: 
   52: or ( i1 i2 -- i )
   53: i = i1 | i2;
   54: 
   55: lessthan ( i1 i2 -- i )
   56: i = i1<i2;
   57: 
   58: equals ( i1 i2 -- i )
   59: i = i1==i2;
   60: 
   61: not ( i1 -- i2 )
   62: i2 = !i1;
   63: 
   64: negate ( i1 -- i2 )
   65: i2 = -i1;
   66: 
   67: lit ( #i -- i )
   68: 
   69: drop ( i -- )
   70: 
   71: print ( i -- )
   72: printf("%ld\n", i);
   73: 
   74: branch ( #target -- )
   75: SET_IP(target);
   76: 
   77: zbranch ( #target i -- )
   78: if (i==0) {
   79:   SET_IP(target);
   80:   INST_TAIL;
   81: }
   82: 
   83: \  The stack is organized as follows:
   84: \  The stack grows downwards; a stack usually looks like this:
   85: 
   86: \  higher addresses
   87: \  --------------------- bottom of stack
   88: \     locals of main
   89: \     return address (points to VM code after call)
   90: \  +->oldfp (NULL)
   91: \  |  intermediate results (e.g., 1 for a call like 1+foo(...))
   92: \  |  arguments passed to the called function
   93: \  |  locals of the called function
   94: \  |  return address (points to VM code after call)
   95: \  +--oldfp                <-- fp
   96: \     intermediate results <-- sp
   97: \  ---------------------- top of stack
   98: \  lower addresses
   99: 
  100: \ The following VM instructions also explicitly reference sp and
  101: \ therefore may have to do something about spTOS caching.
  102: 
  103: call ( #target #iadjust -- targetret aoldfp )
  104: /* IF_spTOS(sp[2] = spTOS);*/ /* unnecessary; vmgen inserts a flush anyway */
  105: targetret = IP;
  106: SET_IP(target);
  107: aoldfp = fp;
  108: sp = (Cell *)(((char *)sp)+iadjust);
  109: fp = (char *)sp;
  110: /* IF_spTOS(spTOS = sp[0]); */ /* dead, thus unnecessary; vmgen copies aoldfp there */
  111: 
  112: return ( #iadjust target afp i1 -- i2 )
  113: /* IF_spTOS(sp[-2] = spTOS); */ /* unnecessary; that stack item is dead */
  114: SET_IP(target);
  115: sp = (Cell *)(((char *)sp)+iadjust);
  116: fp = afp;
  117: i2=i1;
  118: /* IF_spTOS(spTOS = sp[0]); */ /* dead, thus unnecessary; vmgen copies i2 there */
  119: 
  120: \ loadlocal and storelocal access stack items below spTOS, so we can
  121: \ ignore spTOS caching.
  122: 
  123: loadlocal ( #ioffset -- i )
  124: i = *(Cell *)(fp+ioffset);
  125: 
  126: storelocal ( #ioffset i -- )
  127: *(Cell *)(fp+ioffset) = i;
  128: 
  129: end ( i -- )
  130: /* SUPER_END would increment the next BB count (because IP points there);
  131:    this would be a problem if there is no following BB.
  132:    Instead, we do the following to add an end point for the current BB: */
  133: #ifdef VM_PROFILING
  134: block_insert(IP); /* we also do this at compile time, so this is unnecessary */
  135: #endif
  136: return i;
  137: 
  138: include(mini-super.vmg)

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