Free Hero Mesh

        case OP_NEXT:
          FlowPop(OP_FOR);
          AddInst2(OP_NEXT,flowptr[flowdepth]);
          cl->codes[flowptr[flowdepth]]=peep=ptr;
          break;
        case OP_STRING:
          AddInst2(OP_STRING,pool_string(tokenstr));
          break;
        case OP_MBEGIN:
          FlowPush(OP_BEGIN);
          AddInst(OP_TMARK);
          AddInst(OP_IF);
          FlowPush(OP_WHILE);
          peep=++ptr;
          break;
        default:
          if(Tokenf(TF_ABNORMAL)) ParseError("Invalid instruction token\n");
          if(compat && Tokenf(TF_COMPAT) && Tokenf(TF_EQUAL)) ++tokenv;
          AddInstF(tokenv,tokent);
      }
    } else if(Tokenf(TF_FUNCTION)) {

* Object: A reference to an object. There are no literals of this type.

* String: A string in quotation marks. There are no string manipulation
functions; the only thing that can be done with a string is to display it.

* Sound: A named sound effect. Values of this type cannot be compared with
anything, even other values of the same type.

* Mark: There is only one value of this type.

Some things are not their own types, and are other uses of numbers:

* Null: A null class or null object is represented as zero.

* Boolean: When a boolean is required as input to some instruction, zero
is false, and most other values (of any type) are true, except for sounds

/  ( in1 in2 -- out )
  Unsigned divide in1 by in2 producing the quotient.

,/  ( in1 in2 -- out )
  Signed divide in1 by in2 producing the quotient.

_  ( -- mark )
  Add a mark to the stack.

Animate  ( flag start end delay -- ) **
  Start or stop an animation for this object. This also sets the Image
  variable equal to the start value. The flag can be STOP to stop an
  animation, ONCE to play the animation once (and to queue a LASTIMAGE
  event if the animation isn't changed before that happens; note that
  the message is sent even before the animation is actually visible),
  LOOP to play it in a loop, or OSCLOOP for an oscillating loop. The

  be entered into the replay. It is an error to ignore inputs which do
  cause state changes. Pop-up messages are still allowed, and unlike in
  EKS Hero Mesh they will not break replayability; the key to dismiss a
  non-quiz popup is not entered into the replay list, and the key to
  dismiss a quiz popup will be treated as a non-quiz input. IgnoreKey
  also causes the rest of the turn after the input phase to be skipped.

in  ( x mark ... - bool )
  Check if x is equal to any of the values above the mark; equality is
  tested the same as the "eq" instruction.

IntMove  ( dir -- bool ) **
  Similar to Move but do not initialize Inertia at all; use the current
  value of Inertia instead.

,IntMove  ( obj dir -- bool ) **
  Similar to ,Move but do not initialize Inertia at all; use the current
  value of Inertia instead.

NewXY  ( oldx oldy dir -- newx newy )
  NewX and NewY together.

NewY  ( oldy dir -- newy )
  Advance the number in the direction as though it is a Y coordinate.

nin  ( x mark ... - bool )
  Check if x is unequal to any of the values above the mark; this is the
  same as "in lnot".

nip  ( x y -- y )

o?  ( any -- bool )
  True if the value is an object (whether or not it has been garbage
  collected), or false for any other type. Error if it is a sound.

ObjAbove  ( -- obj )

swap  ( x y -- y x )

Synchronize  ( slot startimage -- ) **
  Start a synchronized animation. Give the slot number of the animation,
  and the starting image number. The length and speed are defined in a
  global definition, and the animation is always a non-oscillating loop.

tmark  ( any -- any true | false )
  If the input is a mark, then it is removed and the result is false.
  Otherwise, the value remains and true is added above it on the stack.

Trace  ( obj arg1 arg2 -- )
  If tracing is enabled, sends the three values and some other information
  on stdout. If tracing is disabled, does nothing. This is intended to be
  used for debugging class codes.

tuck  ( x y -- y x y )

  Once "next" is reached, it finds the next object and goes back.

if <truepart> [el <cond> if <truepart> ...] [else <falsepart>] then  ( bool -- )
  Takes a boolean value from the stack. If true, then <truepart> is executed;
  otherwise it tries the other parts; "el" means to execute <cond> and take
  another boolean, and continue; "else" means always do this if none of the
  previous parts match.

mbegin <body> repeat  ( -- any ) ( -- )
  The "mbegin" instruction is a shortcut for "begin tmark while", and it has
  the same behaviour.


=== Substitution codes ===

%c
  Display a single character whose code is the low 8-bits of the value.

    if(current_key && !v_bool(msgvars.arg3)) key_ignored=all_flushed=1;
    return 0;
  }
  if(!i) return 0;
  if(current_key && !v_bool(msgvars.arg3) && !(keymask[i>>3]&(1<<(i&7)))) key_ignored=all_flushed=1;
  return code[i];
}

static int v_in(void) {
  int p=vstackptr;
  Value v;
  while(vstackptr-- && vstack[vstackptr].t!=TY_MARK);
  if(!vstackptr) Throw("No mark");
  v=Pop();
  while(--p>vstackptr) if(v_equal(v,vstack[p])) return 1;
  return 0;
}

// Here is where the execution of a Free Hero Mesh bytecode subroutine is executed.
#define NoIgnore() do{ changed=1; }while(0)
#define GetVariableOf(a,b) (i=v_object(Pop()),i==VOIDLINK?NVALUE(0):b(objects[i]->a))
#define GetVariableOrAttributeOf(a,b) (t2=Pop(),t2.t==TY_CLASS?NVALUE(classes[t2.u]->a):(i=v_object(t2),i==VOIDLINK?NVALUE(0):b(objects[i]->a)))
#define Numeric(a) do{ if((a).t!=TY_NUMBER) Throw("Type mismatch"); }while(0)
#define DivideBy(a) do{ Numeric(a); if(!(a).u) Throw("Division by zero"); }while(0)

    case OP_HEIGHTAT: StackReq(2,1); t2=Pop(); Numeric(t2); t1=Pop(); Numeric(t1); Push(NVALUE(height_at(t1.u,t2.u))); break;
    case OP_IF: StackReq(1,0); if(v_bool(Pop())) ptr++; else ptr=code[ptr]; break;
    case OP_IGNOREKEY: if(current_key) key_ignored=all_flushed=1; break;
    case OP_IMAGE: StackReq(0,1); Push(NVALUE(o->image)); break;
    case OP_IMAGE_C: StackReq(1,1); Push(GetVariableOf(image,NVALUE)); break;
    case OP_IMAGE_E: NoIgnore(); StackReq(1,0); t1=Pop(); Numeric(t1); o->image=t1.u; break;
    case OP_IMAGE_EC: NoIgnore(); StackReq(2,0); t1=Pop(); Numeric(t1); i=v_object(Pop()); if(i!=VOIDLINK) objects[i]->image=t1.u; break;
    case OP_IN: StackReq(2,1); i=v_in(); Push(NVALUE(i?1:0)); break;
    case OP_INERTIA: StackReq(0,1); Push(NVALUE(o->inertia)); break;
    case OP_INERTIA_C: StackReq(1,1); Push(GetVariableOf(inertia,NVALUE)); break;
    case OP_INERTIA_E: StackReq(1,0); t1=Pop(); Numeric(t1); o->inertia=t1.u; break;
    case OP_INERTIA_E16: StackReq(1,0); t1=Pop(); Numeric(t1); o->inertia=t1.u&0xFFFF; break;
    case OP_INERTIA_EC: StackReq(2,0); t1=Pop(); Numeric(t1); i=v_object(Pop()); if(i!=VOIDLINK) objects[i]->inertia=t1.u; break;
    case OP_INERTIA_EC16: StackReq(2,0); t1=Pop(); Numeric(t1); i=v_object(Pop()); if(i!=VOIDLINK) objects[i]->inertia=t1.u&0xFFFF; break;
    case OP_INT16: StackReq(0,1); Push(NVALUE(code[ptr++])); break;

    case OP_LOCATEME: locate_me(o->x,o->y); break;
    case OP_LOR: StackReq(2,1); t1=Pop(); t2=Pop(); if(v_bool(t1) || v_bool(t2)) Push(NVALUE(1)); else Push(NVALUE(0)); break;
    case OP_LOSELEVEL: gameover=-1; Throw(0); break;
    case OP_LSH: StackReq(2,1); t2=Pop(); Numeric(t2); t1=Pop(); Numeric(t1); Push(NVALUE(t2.u&~31?0:t1.u<<t2.u)); break;
    case OP_LT: StackReq(2,1); t2=Pop(); t1=Pop(); Push(NVALUE(v_unsigned_greater(t2,t1)?1:0)); break;
    case OP_LT_C: StackReq(2,1); t2=Pop(); t1=Pop(); Push(NVALUE(v_signed_greater(t2,t1)?1:0)); break;
    case OP_LXOR: StackReq(2,1); t1=Pop(); t2=Pop(); if(v_bool(t1)?!v_bool(t2):v_bool(t2)) Push(NVALUE(1)); else Push(NVALUE(0)); break;
    case OP_MARK: StackReq(0,1); Push(UVALUE(0,TY_MARK)); break;
    case OP_MAXINVENTORY: StackReq(1,0); t1=Pop(); Numeric(t1); if(ninventory>t1.u) Throw("Inventory overflow"); break;
    case OP_MOD: StackReq(2,1); t2=Pop(); DivideBy(t2); t1=Pop(); Numeric(t1); Push(NVALUE(t1.u%t2.u)); break;
    case OP_MOD_C: StackReq(2,1); t2=Pop(); DivideBy(t2); t1=Pop(); Numeric(t1); Push(NVALUE(t1.s%t2.s)); break;
    case OP_MOVE: NoIgnore(); StackReq(1,1); t1=Pop(); Numeric(t1); o->inertia=o->strength; Push(NVALUE(move_dir(obj,obj,t1.u))); break;
    case OP_MOVE_C: NoIgnore(); StackReq(2,1); t1=Pop(); Numeric(t1); i=v_object(Pop()); if(i==VOIDLINK) Push(NVALUE(0)); else { objects[i]->inertia=o->strength; Push(NVALUE(move_dir(obj,i,t1.u))); } break;
    case OP_MOVE_D: NoIgnore(); StackReq(1,0); t1=Pop(); Numeric(t1); o->inertia=o->strength; move_dir(obj,obj,t1.u); break;
    case OP_MOVE_CD: NoIgnore(); StackReq(2,0); t1=Pop(); Numeric(t1); i=v_object(Pop()); if(i!=VOIDLINK) { objects[i]->inertia=o->strength; move_dir(obj,i,t1.u); } break;

    case OP_MUL_C: StackReq(2,1); t2=Pop(); Numeric(t2); t1=Pop(); Numeric(t1); Push(NVALUE(t1.s*t2.s)); break;
    case OP_NE: StackReq(2,1); t2=Pop(); t1=Pop(); Push(NVALUE(v_equal(t1,t2)?0:1)); break;
    case OP_NEG: StackReq(1,1); t1=Pop(); Numeric(t1); t1.s=-t1.s; Push(t1); break;
    case OP_NEWX: StackReq(2,1); t2=Pop(); Numeric(t2); t1=Pop(); Numeric(t1); Push(NVALUE(new_x(t1.u,t2.u))); break;
    case OP_NEWXY: StackReq(3,1); t3=Pop(); Numeric(t3); t2=Pop(); Numeric(t2); t1=Pop(); Numeric(t1); Push(NVALUE(new_x(t1.u,t3.u))); Push(NVALUE(new_y(t2.u,t3.u))); break;
    case OP_NEWY: StackReq(2,1); t2=Pop(); Numeric(t2); t1=Pop(); Numeric(t1); Push(NVALUE(new_y(t1.u,t2.u))); break;
    case OP_NEXT: StackReq(0,1); ptr=v_next(code,ptr); break;
    case OP_NIN: StackReq(2,1); i=v_in(); Push(NVALUE(i?0:1)); break;
    case OP_NIP: StackReq(2,1); t1=Pop(); Pop(); Push(t1); break;
    case OP_OBJABOVE: StackReq(0,1); i=obj_above(obj); Push(OVALUE(i)); break;
    case OP_OBJABOVE_C: StackReq(1,1); i=obj_above(v_object(Pop())); Push(OVALUE(i)); break;
    case OP_OBJBELOW: StackReq(0,1); i=obj_below(obj); Push(OVALUE(i)); break;
    case OP_OBJBELOW_C: StackReq(1,1); i=obj_below(v_object(Pop())); Push(OVALUE(i)); break;
    case OP_OBJBOTTOMAT: StackReq(2,1); t2=Pop(); Numeric(t2); t1=Pop(); Numeric(t1); i=obj_bottom_at(t1.u,t2.u); Push(OVALUE(i)); break;
    case OP_OBJCLASSAT: StackReq(3,1); t3=Pop(); t2=Pop(); t1=Pop(); Push(v_obj_class_at(t1,t2,t3)); break;

    case OP_SYNCHRONIZE: StackReq(2,0); t2=Pop(); Numeric(t2); t1=Pop(); Numeric(t1); animate_sync(obj,t1.u,t2.u); break;
    case OP_TEMPERATURE: StackReq(0,1); Push(NVALUE(o->temperature)); break;
    case OP_TEMPERATURE_C: StackReq(1,1); Push(GetVariableOrAttributeOf(temperature,NVALUE)); break;
    case OP_TEMPERATURE_E: NoIgnore(); StackReq(1,0); t1=Pop(); Numeric(t1); o->temperature=t1.u; break;
    case OP_TEMPERATURE_E16: NoIgnore(); StackReq(1,0); t1=Pop(); Numeric(t1); o->temperature=t1.u&0xFFFF; break;
    case OP_TEMPERATURE_EC: NoIgnore(); StackReq(2,0); t1=Pop(); Numeric(t1); i=v_object(Pop()); if(i!=VOIDLINK) objects[i]->temperature=t1.u; break;
    case OP_TEMPERATURE_EC16: NoIgnore(); StackReq(2,0); t1=Pop(); Numeric(t1); i=v_object(Pop()); if(i!=VOIDLINK) objects[i]->temperature=t1.u; break;
    case OP_TMARK: StackReq(1,2); t1=Pop(); if(t1.t==TY_MARK) { Push(NVALUE(0)); } else { Push(t1); Push(NVALUE(1)); } break;
    case OP_TRACE: StackReq(3,0); trace_stack(obj); break;
    case OP_TUCK: StackReq(2,3); t2=Pop(); t1=Pop(); Push(t2); Push(t1); Push(t2); break;
    case OP_USERSIGNAL: StackReq(0,1); if(o->oflags&OF_USERSIGNAL) Push(NVALUE(1)); else Push(NVALUE(0)); break;
    case OP_USERSIGNAL_C: StackReq(1,1); GetFlagOf(OF_USERSIGNAL); break;
    case OP_USERSIGNAL_E: NoIgnore(); StackReq(1,0); if(v_bool(Pop())) o->oflags|=OF_USERSIGNAL; else o->oflags&=~OF_USERSIGNAL; break;
    case OP_USERSIGNAL_EC: NoIgnore(); StackReq(2,0); SetFlagOf(OF_USERSIGNAL); break;
    case OP_USERSTATE: StackReq(0,1); if(o->oflags&OF_USERSTATE) Push(NVALUE(1)); else Push(NVALUE(0)); break;

    [TY_NUMBER]="number",
    [TY_CLASS]="class",
    [TY_MESSAGE]="message",
    [TY_LEVELSTRING]="string",
    [TY_STRING]="string",
    [TY_SOUND]="sound",
    [TY_USOUND]="sound",
    [TY_MARK]="mark",
  };
  int i;
  if(sqlite3_value_type(*argv)!=SQLITE_INTEGER) return;
  i=sqlite3_value_int64(*argv)>>32;
  sqlite3_result_text(cxt,i<0||i>TY_MAXTYPE?"object":n[i]?:"???",-1,SQLITE_STATIC);
}

      break;
    case TY_LEVELSTRING: case TY_STRING:
      draw_text(200,y,"<String>",0xF0,0xF9);
      break;
    case TY_SOUND: case TY_USOUND:
      draw_text(200,y,"<Sound>",0xF0,0xF6);
      break;
    case TY_MARK:
      draw_text(200,y,"<Mark>",0xF0,0xF3);
      break;
    default:
      snprintf(buf,80,"<%lu:%lu>",(long)v.u,(long)v.t);
      draw_text(200,y,buf,0xF0,0xFA);
      i=strlen(buf)*8+208;
      if(v.u<nobjects && objects[v.u] && objects[v.u]->generation==v.t) {
        snprintf(buf,80,"@ (%d,%d)",objects[v.u]->x,objects[v.u]->y);
        draw_text(i,y,buf,0xF0,0xF2);

#define TY_CLASS 1
#define TY_MESSAGE 2
#define TY_LEVELSTRING 3
#define TY_STRING 4
#define TY_SOUND 5
#define TY_USOUND 6
#define TY_FOR 7
#define TY_MARK 8
#define TY_MAXTYPE 15
// The level file format requires type codes 0 to 3 to be as is; other codes may change.

typedef struct {
  union {
    Sint32 s;
    Uint32 u;

Synchronize
Trace
VolumeAt
WinLevel
,XDir
XYDir
,YDir

; Operations with marks
mark "_"
tmark
in
nin
-mbegin

; Specials
*Function
*Local
*Label
*String
*Int16
*Int32
*Dispatch

#define OP_VOLUMEAT 32941
#define OP_WINLEVEL 32942
#define OP_XDIR 32943
#define OP_XDIR_C 34991
#define OP_XYDIR 32944
#define OP_YDIR 32945
#define OP_YDIR_C 34993
#define OP_MARK 32946
#define OP_TMARK 32947
#define OP_IN 32948
#define OP_NIN 32949
#define OP_MBEGIN 32950
#define OP_FUNCTION 32951
#define OP_LOCAL 32952
#define OP_LABEL 32953
#define OP_STRING 32954
#define OP_INT16 32955
#define OP_INT32 32956
#define OP_DISPATCH 32957
#ifdef HEROMESH_CLASS
static const Op_Names op_names[]={
{"*",8486936},
{"+",8421398},
{"-",8421399},
{"-rot",8421382},
{".",10518528},

{"WinLevel",8421550},
{"XDir",8487087},
{"XYDir",8421552},
{"Xloc",8486969},
{"YDir",8487089},
{"YEEHAW",8389401},
{"Yloc",8486970},
{"_",8421554},
{"again",8683533},
{"band",8421406},
{"begin",8683532},
{"bit",8683554},
{"bit0",8388609},
{"bit1",8388610},
{"bit10",8423402},

{"el",8683531},
{"else",8683529},
{"eq",8421415},
{"for",8683537},
{"ge",8486955},
{"gt",8486953},
{"if",8683528},
{"in",8421556},
{"is",8421421},
{"land",8421411},
{"le",8486956},
{"lnot",8421414},
{"lor",8421412},
{"lsh",8421404},
{"lt",8486954},
{"lxor",8421413},
{"m?",8421425},
{"mbegin",8683702},
{"mod",8486938},
{"n?",8421422},
{"ne",8421416},
{"neg",8421403},
{"next",8683538},
{"nin",8421557},
{"nip",8421379},
{"o?",8421427},
{"oz?",8421428},
{"pick",8421383},
{"repeat",8683536},
{"ret",8421397},
{"rot",8421381},
{"rsh",8486941},
{"s?",8421426},
{"swap",8421378},
{"then",8683530},
{"tmark",8421555},
{"tuck",8421380},
{"until",8683534},
{"while",8683535},
};
#define N_OP_NAMES 290
#endif