/*
** $Id: lopcodes.h,v 1.125.1.1 2007/12/27 13:02:25 roberto Exp $
** Opcodes for Lua virtual machine
** See Copyright Notice in lua.h
*/

#ifndef lopcodes_h
#define lopcodes_h

#include "llimits.h"


/*===========================================================================
  We assume that instructions are unsigned numbers.
  All instructions have an opcode in the first 6 bits.
  Instructions can have the following fields:
	`A' : 8 bits
	`B' : 9 bits
	`C' : 9 bits
	`Bx' : 18 bits (`B' and `C' together)
	`sBx' : signed Bx

  A signed argument is represented in excess K; that is, the number
  value is the unsigned value minus K. K is exactly the maximum value
  for that argument (so that -max is represented by 0, and +max is
  represented by 2*max), which is half the maximum for the corresponding
  unsigned argument.
===========================================================================*/


enum OpMode {iABC, iABx, iAsBx};  /* basic instruction format */


/*
** size and position of opcode arguments.
*/
#define SIZE_C		9
#define SIZE_B		9
#define SIZE_Bx		(SIZE_C + SIZE_B)
#define SIZE_A		8

#define SIZE_OP		6

#define POS_OP		0
#define POS_A		(POS_OP + SIZE_OP)
#define POS_C		(POS_A + SIZE_A)
#define POS_B		(POS_C + SIZE_C)
#define POS_Bx		POS_C


/*
** limits for opcode arguments.
** we use (signed) int to manipulate most arguments,
** so they must fit in LUAI_BITSINT-1 bits (-1 for sign)
*/
#if SIZE_Bx < LUAI_BITSINT-1
#define MAXARG_Bx        ((1<<SIZE_Bx)-1)
#define MAXARG_sBx        (MAXARG_Bx>>1)         /* `sBx' is signed */
#else
#define MAXARG_Bx        MAX_INT
#define MAXARG_sBx        MAX_INT
#endif


#define MAXARG_A        ((1<<SIZE_A)-1)
#define MAXARG_B        ((1<<SIZE_B)-1)
#define MAXARG_C        ((1<<SIZE_C)-1)


/* creates a mask with `n' 1 bits at position `p' */
#define MASK1(n,p)	((~((~(Instruction)0)<<n))<<p)

/* creates a mask with `n' 0 bits at position `p' */
#define MASK0(n,p)	(~MASK1(n,p))

/*
** the following macros help to manipulate instructions
*/

#define GET_OPCODE(i)	(cast(OpCode, ((i)>>POS_OP) & MASK1(SIZE_OP,0)))
#define SET_OPCODE(i,o)	((i) = (((i)&MASK0(SIZE_OP,POS_OP)) | \
		((cast(Instruction, o)<<POS_OP)&MASK1(SIZE_OP,POS_OP))))

#define GETARG_A(i)	(cast(int, ((i)>>POS_A) & MASK1(SIZE_A,0)))
#define SETARG_A(i,u)	((i) = (((i)&MASK0(SIZE_A,POS_A)) | \
		((cast(Instruction, u)<<POS_A)&MASK1(SIZE_A,POS_A))))

#define GETARG_B(i)	(cast(int, ((i)>>POS_B) & MASK1(SIZE_B,0)))
#define SETARG_B(i,b)	((i) = (((i)&MASK0(SIZE_B,POS_B)) | \
		((cast(Instruction, b)<<POS_B)&MASK1(SIZE_B,POS_B))))

#define GETARG_C(i)	(cast(int, ((i)>>POS_C) & MASK1(SIZE_C,0)))
#define SETARG_C(i,b)	((i) = (((i)&MASK0(SIZE_C,POS_C)) | \
		((cast(Instruction, b)<<POS_C)&MASK1(SIZE_C,POS_C))))

#define GETARG_Bx(i)	(cast(int, ((i)>>POS_Bx) & MASK1(SIZE_Bx,0)))
#define SETARG_Bx(i,b)	((i) = (((i)&MASK0(SIZE_Bx,POS_Bx)) | \
		((cast(Instruction, b)<<POS_Bx)&MASK1(SIZE_Bx,POS_Bx))))

#define GETARG_sBx(i)	(GETARG_Bx(i)-MAXARG_sBx)
#define SETARG_sBx(i,b)	SETARG_Bx((i),cast(unsigned int, (b)+MAXARG_sBx))


#define CREATE_ABC(o,a,b,c)	((cast(Instruction, o)<<POS_OP) \
			| (cast(Instruction, a)<<POS_A) \
			| (cast(Instruction, b)<<POS_B) \
			| (cast(Instruction, c)<<POS_C))

#define CREATE_ABx(o,a,bc)	((cast(Instruction, o)<<POS_OP) \
			| (cast(Instruction, a)<<POS_A) \
			| (cast(Instruction, bc)<<POS_Bx))


/*
** Macros to operate RK indices
*/

/* this bit 1 means constant (0 means register) */
#define BITRK		(1 << (SIZE_B - 1))

/* test whether value is a constant */
#define ISK(x)		((x) & BITRK)

/* gets the index of the constant */
#define INDEXK(r)	((int)(r) & ~BITRK)

#define MAXINDEXRK	(BITRK - 1)

/* code a constant index as a RK value */
#define RKASK(x)	((x) | BITRK)


/*
** invalid register that fits in 8 bits
*/
#define NO_REG		MAXARG_A


/*
** R(x) - register
** Kst(x) - constant (in constant table)
** RK(x) == if ISK(x) then Kst(INDEXK(x)) else R(x)
*/


/*
** grep "ORDER OP" if you change these enums
*/

typedef enum {
/*----------------------------------------------------------------------
name		args	description
------------------------------------------------------------------------*/
OP_MOVE,/*	A B	R(A) := R(B)					*/
OP_LOADK,/*	A Bx	R(A) := Kst(Bx)					*/
OP_LOADBOOL,/*	A B C	R(A) := (Bool)B; if (C) pc++			*/
OP_LOADNIL,/*	A B	R(A) := ... := R(B) := nil			*/
OP_GETUPVAL,/*	A B	R(A) := UpValue[B]				*/

OP_GETGLOBAL,/*	A Bx	R(A) := Gbl[Kst(Bx)]				*/
OP_GETTABLE,/*	A B C	R(A) := R(B)[RK(C)]				*/

OP_SETGLOBAL,/*	A Bx	Gbl[Kst(Bx)] := R(A)				*/
OP_SETUPVAL,/*	A B	UpValue[B] := R(A)				*/
OP_SETTABLE,/*	A B C	R(A)[RK(B)] := RK(C)				*/

OP_NEWTABLE,/*	A B C	R(A) := {} (size = B,C)				*/

OP_SELF,/*	A B C	R(A+1) := R(B); R(A) := R(B)[RK(C)]		*/

OP_ADD,/*	A B C	R(A) := RK(B) + RK(C)				*/
OP_SUB,/*	A B C	R(A) := RK(B) - RK(C)				*/
OP_MUL,/*	A B C	R(A) := RK(B) * RK(C)				*/
OP_DIV,/*	A B C	R(A) := RK(B) / RK(C)				*/
OP_MOD,/*	A B C	R(A) := RK(B) % RK(C)				*/
OP_POW,/*	A B C	R(A) := RK(B) ^ RK(C)				*/
OP_UNM,/*	A B	R(A) := -R(B)					*/
OP_NOT,/*	A B	R(A) := not R(B)				*/
OP_LEN,/*	A B	R(A) := length of R(B)				*/

OP_CONCAT,/*	A B C	R(A) := R(B).. ... ..R(C)			*/

OP_JMP,/*	sBx	pc+=sBx					*/

OP_EQ,/*	A B C	if ((RK(B<span class="hl com">/*</span>
<span class="hl com">Minetest</span>
<span class="hl com">Copyright (C) 2013 celeron55, Perttu Ahola &lt;celeron55&#64;gmail.com&gt;</span>
<span class="hl com"></span>
<span class="hl com">This program is free software; you can redistribute it and/or modify</span>
<span class="hl com">it under the terms of the GNU Lesser General Public License as published by</span>
<span class="hl com">the Free Software Foundation; either version 2.1 of the License, or</span>
<span class="hl com">(at your option) any later version.</span>
<span class="hl com"></span>
<span class="hl com">This program is distributed in the hope that it will be useful,</span>
<span class="hl com">but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="hl com">MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<span class="hl com">GNU Lesser General Public License for more details.</span>
<span class="hl com"></span>
<span class="hl com">You should have received a copy of the GNU Lesser General Public License along</span>
<span class="hl com">with this program; if not, write to the Free Software Foundation, Inc.,</span>
<span class="hl com">51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.</span>
<span class="hl com">*/</span>

<span class="hl ppc">#ifndef L_NODETIMER_H_</span>
<span class="hl ppc">#define L_NODETIMER_H_</span>

<span class="hl ppc">#include</span> <span class="hl pps">&quot;lua_api/l_base.h&quot;</span><span class="hl ppc"></span>
<span class="hl ppc">#include</span> <span class="hl pps">&quot;irr_v3d.h&quot;</span><span class="hl ppc"></span>

<span class="hl kwc">class</span> ServerEnvironment<span class="hl opt">;</span>

<span class="hl kwc">class</span> NodeTimerRef <span class="hl opt">:</span> <span class="hl kwc">public</span> ModApiBase <span class="hl opt">{</span>
<span class="hl kwc">private</span><span class="hl opt">:</span>
	v3s16 m_p<span class="hl opt">;</span>
	ServerEnvironment <span class="hl opt">*</span>m_env<span class="hl opt">;</span>

	<span class="hl kwb">static const char</span> className<span class="hl opt">[];</span>
	<span class="hl kwb">static const</span> luaL_reg methods<span class="hl opt">[];</span>

	<span class="hl kwb">static int</span> <span class="hl kwd">gc_object</span><span class="hl opt">(</span>lua_State <span class="hl opt">*</span>L<span class="hl opt">);</span>

	<span class="hl kwb">static</span> NodeTimerRef <span class="hl opt">*</span><span class="hl kwd">checkobject</span><span class="hl opt">(</span>lua_State <span class="hl opt">*</span>L<span class="hl opt">,</span> <span class="hl kwb">int</span> narg<span class="hl opt">);</span>

	<span class="hl kwb">static int</span> <span class="hl kwd">l_set</span><span class="hl opt">(</span>lua_State <span class="