Free Hero Mesh

    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;