lopcodes.h - external/github.com/lua/lua - Git at Google

 /*
 ** $Id: lopcodes.h $
 ** 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 32-bit integers.
   All instructions have an opcode in the first 7 bits.
   Instructions can have the following formats:

         3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
         1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 iABC          C(8)     |      B(8)     |k|     A(8)      |   Op(7)     |
 iABx                Bx(17)               |     A(8)      |   Op(7)     |
 iAsBx              sBx (signed)(17)      |     A(8)      |   Op(7)     |
 iAx                           Ax(25)                     |   Op(7)     |
 isJ                           sJ(25)                     |   Op(7)     |

   A signed argument is represented in excess K: the represented value is
   the written unsigned value minus K, where K is half the maximum for the
   corresponding unsigned argument.
 ===========================================================================*/


 enum OpMode {iABC, iABx, iAsBx, iAx, isJ};  /* basic instruction formats */


 /*
 ** size and position of opcode arguments.
 */
 #define SIZE_C		8
 #define SIZE_B		8
 #define SIZE_Bx		(SIZE_C + SIZE_B + 1)
 #define SIZE_A		8
 #define SIZE_Ax		(SIZE_Bx + SIZE_A)
 #define SIZE_sJ		(SIZE_Bx + SIZE_A)

 #define SIZE_OP		7

 #define POS_OP		0

 #define POS_A		(POS_OP + SIZE_OP)
 #define POS_k		(POS_A + SIZE_A)
 #define POS_B		(POS_k + 1)
 #define POS_C		(POS_B + SIZE_B)

 #define POS_Bx		POS_k

 #define POS_Ax		POS_A

 #define POS_sJ		POS_A


 /*
 ** limits for opcode arguments.
 ** we use (signed) 'int' to manipulate most arguments,
 ** so they must fit in ints.
 */

 /* Check whether type 'int' has at least 'b' bits ('b' < 32) */
 #define L_INTHASBITS(b)		((UINT_MAX >> ((b) - 1)) >= 1)


 #if L_INTHASBITS(SIZE_Bx)
 #define MAXARG_Bx	((1<<SIZE_Bx)-1)
 #else
 #define MAXARG_Bx	MAX_INT
 #endif

 #define OFFSET_sBx	(MAXARG_Bx>>1)         /* 'sBx' is signed */


 #if L_INTHASBITS(SIZE_Ax)
 #define MAXARG_Ax	((1<<SIZE_Ax)-1)
 #else
 #define MAXARG_Ax	MAX_INT
 #endif

 #if L_INTHASBITS(SIZE_sJ)
 #define MAXARG_sJ	((1 << SIZE_sJ) - 1)
 #else
 #define MAXARG_sJ	MAX_INT
 #endif

 #define OFFSET_sJ	(MAXARG_sJ >> 1)


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

 #define int2sC(i)	((i) + OFFSET_sC)
 #define sC2int(i)	((i) - OFFSET_sC)


 /* 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 checkopm(i,m)	(getOpMode(GET_OPCODE(i)) == m)


 #define getarg(i,pos,size)	(cast_int(((i)>>(pos)) & MASK1(size,0)))
 #define setarg(i,v,pos,size)	((i) = (((i)&MASK0(size,pos)) | \
                 ((cast(Instruction, v)<<pos)&MASK1(size,pos))))

 #define GETARG_A(i)	getarg(i, POS_A, SIZE_A)
 #define SETARG_A(i,v)	setarg(i, v, POS_A, SIZE_A)

 #define GETARG_B(i)	check_exp(checkopm(i, iABC), getarg(i, POS_B, SIZE_B))
 #define GETARG_sB(i)	sC2int(GETARG_B(i))
 #define SETARG_B(i,v)	setarg(i, v, POS_B, SIZE_B)

 #define GETARG_C(i)	check_exp(checkopm(i, iABC), getarg(i, POS_C, SIZE_C))
 #define GETARG_sC(i)	sC2int(GETARG_C(i))
 #define SETARG_C(i,v)	setarg(i, v, POS_C, SIZE_C)

 #define TESTARG_k(i)	check_exp(checkopm(i, iABC), (cast_int(((i) & (1u << POS_k)))))
 #define GETARG_k(i)	check_exp(checkopm(i, iABC), getarg(i, POS_k, 1))
 #define SETARG_k(i,v)	setarg(i, v, POS_k, 1)

 #define GETARG_Bx(i)	check_exp(checkopm(i, iABx), getarg(i, POS_Bx, SIZE_Bx))
 #define SETARG_Bx(i,v)	setarg(i, v, POS_Bx, SIZE_Bx)

 #define GETARG_Ax(i)	check_exp(checkopm(i, iAx), getarg(i, POS_Ax, SIZE_Ax))
 #define SETARG_Ax(i,v)	setarg(i, v, POS_Ax, SIZE_Ax)

 #define GETARG_sBx(i)  \
 	check_exp(checkopm(i, iAsBx), getarg(i, POS_Bx, SIZE_Bx) - OFFSET_sBx)
 #define SETARG_sBx(i,b)	SETARG_Bx((i),cast_uint((b)+OFFSET_sBx))

 #define GETARG_sJ(i)  \
 	check_exp(checkopm(i, isJ), getarg(i, POS_sJ, SIZE_sJ) - OFFSET_sJ)
 #define SETARG_sJ(i,j) \
 	setarg(i, cast_uint((j)+OFFSET_sJ), POS_sJ, SIZE_sJ)


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

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

 #define CREATE_Ax(o,a)		((cast(Instruction, o)<<POS_OP) \
 			| (cast(Instruction, a)<<POS_Ax))

 #define CREATE_sJ(o,j,k)	((cast(Instruction, o) << POS_OP) \
 			| (cast(Instruction, j) << POS_sJ) \
 			| (cast(Instruction, k) << POS_k))


 #if !defined(MAXINDEXRK)  /* (for debugging only) */
 #define MAXINDEXRK	MAXARG_B
 #endif


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


 /*
 ** R[x] - register
 ** K[x] - constant (in constant table)
 ** RK(x) == if k(i) then K[x] else R[x]
 */


 /*
 ** Grep "ORDER OP" if you change these enums. Opcodes marked with a (*)
 ** has extra descriptions in the notes after the enumeration.
 */

 typedef enum {
 /*----------------------------------------------------------------------
   name		args	description
 ------------------------------------------------------------------------*/
 OP_MOVE,/*	A B	R[A] := R[B]					*/
 OP_LOADI,/*	A sBx	R[A] := sBx					*/
 OP_LOADF,/*	A sBx	R[A] := (lua_Number)sBx				*/
 OP_LOADK,/*	A Bx	R[A] := K[Bx]					*/
 OP_LOADKX,/*	A	R[A] := K[extra arg]				*/
 OP_LOADFALSE,/*	A	R[A] := false					*/
 OP_LFALSESKIP,/*A	R[A] := false; pc++	(*)			*/
 OP_LOADTRUE,/*	A	R[A] := true					*/
 OP_LOADNIL,/*	A B	R[A], R[A+1], ..., R[A+B] := nil		*/
 OP_GETUPVAL,/*	A B	R[A] := UpValue[B]				*/
 OP_SETUPVAL,/*	A B	UpValue[B] := R[A]				*/

 OP_GETTABUP,/*	A B C	R[A] := UpValue[B][K[C]:string]			*/
 OP_GETTABLE,/*	A B C	R[A] := R[B][R[C]]				*/
 OP_GETI,/*	A B C	R[A] := R[B][C]					*/
 OP_GETFIELD,/*	A B C	R[A] := R[B][K[C]:string]			*/

 OP_SETTABUP,/*	A B C	UpValue[A][K[B]:string] := RK(C)		*/
 OP_SETTABLE,/*	A B C	R[A][R[B]] := RK(C)				*/
 OP_SETI,/*	A B C	R[A][B] := RK(C)				*/
 OP_SETFIELD,/*	A B C	R[A][K[B]:string] := RK(C)			*/

 OP_NEWTABLE,/*	A B C k	R[A] := {}					*/

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

 OP_ADDI,/*	A B sC	R[A] := R[B] + sC				*/

 OP_ADDK,/*	A B C	R[A] := R[B] + K[C]:number			*/
 OP_SUBK,/*	A B C	R[A] := R[B] - K[C]:number			*/
 OP_MULK,/*	A B C	R[A] := R[B] * K[C]:number			*/
 OP_MODK,/*	A B C	R[A] := R[B] % K[C]:number			*/
 OP_POWK,/*	A B C	R[A] := R[B] ^ K[C]:number			*/
 OP_DIVK,/*	A B C	R[A] := R[B] / K[C]:number			*/
 OP_IDIVK,/*	A B C	R[A] := R[B] // K[C]:number			*/

 OP_BANDK,/*	A B C	R[A] := R[B] & K[C]:integer			*/
 OP_BORK,/*	A B C	R[A] := R[B] | K[C]:integer			*/
 OP_BXORK,/*	A B C	R[A] := R[B] ~ K[C]:integer			*/

 OP_SHRI,/*	A B sC	R[A] := R[B] >> sC				*/
 OP_SHLI,/*	A B sC	R[A] := sC << R[B]				*/

 OP_ADD,/*	A B C	R[A] := R[B] + R[C]				*/
 OP_SUB,/*	A B C	R[A] := R[B] - R[C]				*/
 OP_MUL,/*	A B C	R[A] := R[B] * R[C]				*/
 OP_MOD,/*	A B C	R[A] := R[B] % R[C]				*/
 OP_POW,/*	A B C	R[A] := R[B] ^ R[C]				*/
 OP_DIV,/*	A B C	R[A] := R[B] / R[C]				*/
 OP_IDIV,/*	A B C	R[A] := R[B] // R[C]				*/

 OP_BAND,/*	A B C	R[A] := R[B] & R[C]				*/
 OP_BOR,/*	A B C	R[A] := R[B] | R[C]				*/
 OP_BXOR,/*	A B C	R[A] := R[B] ~ R[C]				*/
 OP_SHL,/*	A B C	R[A] := R[B] << R[C]				*/
 OP_SHR,/*	A B C	R[A] := R[B] >> R[C]				*/

 OP_MMBIN,/*	A B C	call C metamethod over R[A] and R[B]	(*)	*/
 OP_MMBINI,/*	A sB C k	call C metamethod over R[A] and sB	*/
 OP_MMBINK,/*	A B C k		call C metamethod over R[A] and K[B]	*/

 OP_UNM,/*	A B	R[A] := -R[B]					*/
 OP_BNOT,/*	A B	R[A] := ~R[B]					*/
 OP_NOT,/*	A B	R[A] := not R[B]				*/
 OP_LEN,/*	A B	R[A] := #R[B] (length operator)			*/

 OP_CONCAT,/*	A B	R[A] := R[A].. ... ..R[A + B - 1]		*/

 OP_CLOSE,/*	A	close all upvalues >= R[A]			*/
 OP_TBC,/*	A	mark variable A "to be closed"			*/
 OP_JMP,/*	sJ	pc += sJ					*/
 OP_EQ,/*	A B k	if ((R[A] == R[B]) ~= k) then pc++		*/
 OP_LT,/*	A B k	if ((R[A] <  R[B]) ~= k) then pc++		*/
 OP_LE,/*	A B k	if ((R[A] <= R[B]) ~= k) then pc++		*/

 OP_EQK,/*	A B k	if ((R[A] == K[B]) ~= k) then pc++		*/
 OP_EQI,/*	A sB k	if ((R[A] == sB) ~= k) then pc++		*/
 OP_LTI,/*	A sB k	if ((R[A] < sB) ~= k) then pc++			*/
 OP_LEI,/*	A sB k	if ((R[A] <= sB) ~= k) then pc++		*/
 OP_GTI,/*	A sB k	if ((R[A] > sB) ~= k) then pc++			*/
 OP_GEI,/*	A sB k	if ((R[A] >= sB) ~= k) then pc++		*/

 OP_TEST,/*	A k	if (not R[A] == k) then pc++			*/
 OP_TESTSET,/*	A B k	if (not R[B] == k) then pc++ else R[A] := R[B] (*) */

 OP_CALL,/*	A B C	R[A], ... ,R[A+C-2] := R[A](R[A+1], ... ,R[A+B-1]) */
 OP_TAILCALL,/*	A B C k	return R[A](R[A+1], ... ,R[A+B-1])		*/

 OP_RETURN,/*	A B C k	return R[A], ... ,R[A+B-2]	(see note)	*/
 OP_RETURN0,/*		return						*/
 OP_RETURN1,/*	A	return R[A]					*/

 OP_FORLOOP,/*	A Bx	update counters; if loop continues then pc-=Bx; */
 OP_FORPREP,/*	A Bx	<check values and prepare counters>;
                         if not to run then pc+=Bx+1;			*/

 OP_TFORPREP,/*	A Bx	create upvalue for R[A + 3]; pc+=Bx		*/
 OP_TFORCALL,/*	A C	R[A+4], ... ,R[A+3+C] := R[A](R[A+1], R[A+2]);	*/
 OP_TFORLOOP,/*	A Bx	if R[A+2] ~= nil then { R[A]=R[A+2]; pc -= Bx }	*/

 OP_SETLIST,/*	A B C k	R[A][C+i] := R[A+i], 1 <= i <= B		*/

 OP_CLOSURE,/*	A Bx	R[A] := closure(KPROTO[Bx])			*/

 OP_VARARG,/*	A C	R[A], R[A+1], ..., R[A+C-2] = vararg		*/

 OP_VARARGPREP,/*A	(adjust vararg parameters)			*/

 OP_EXTRAARG/*	Ax	extra (larger) argument for previous opcode	*/
 } OpCode;


 #define NUM_OPCODES	((int)(OP_EXTRAARG) + 1)


 /*===========================================================================
   Notes:

   (*) Opcode OP_LFALSESKIP is used to convert a condition to a boolean
   value, in a code equivalent to (not cond ? false : true).  (It
   produces false and skips the next instruction producing true.)

   (*) Opcodes OP_MMBIN and variants follow each arithmetic and
   bitwise opcode. If the operation succeeds, it skips this next
   opcode. Otherwise, this opcode calls the corresponding metamethod.

   (*) Opcode OP_TESTSET is used in short-circuit expressions that need
   both to jump and to produce a value, such as (a = b or c).

   (*) In OP_CALL, if (B == 0) then B = top - A. If (C == 0), then
   'top' is set to last_result+1, so next open instruction (OP_CALL,
   OP_RETURN*, OP_SETLIST) may use 'top'.

   (*) In OP_VARARG, if (C == 0) then use actual number of varargs and
   set top (like in OP_CALL with C == 0).

   (*) In OP_RETURN, if (B == 0) then return up to 'top'.

   (*) In OP_LOADKX and OP_NEWTABLE, the next instruction is always
   OP_EXTRAARG.

   (*) In OP_SETLIST, if (B == 0) then real B = 'top'; if k, then
   real C = EXTRAARG _ C (the bits of EXTRAARG concatenated with the
   bits of C).

   (*) In OP_NEWTABLE, B is log2 of the hash size (which is always a
   power of 2) plus 1, or zero for size zero. If not k, the array size
   is C. Otherwise, the array size is EXTRAARG _ C.

   (*) For comparisons, k specifies what condition the test should accept
   (true or false).

   (*) In OP_MMBINI/OP_MMBINK, k means the arguments were flipped
    (the constant is the first operand).

   (*) All 'skips' (pc++) assume that next instruction is a jump.

   (*) In instructions OP_RETURN/OP_TAILCALL, 'k' specifies that the
   function builds upvalues, which may need to be closed. C > 0 means
   the function is vararg, so that its 'func' must be corrected before
   returning; in this case, (C - 1) is its number of fixed parameters.

   (*) In comparisons with an immediate operand, C signals whether the
   original operand was a float. (It must be corrected in case of
   metamethods.)

 ===========================================================================*/


 /*
 ** masks for instruction properties. The format is:
 ** bits 0-2: op mode
 ** bit 3: instruction set register A
 ** bit 4: operator is a test (next instruction must be a jump)
 ** bit 5: instruction uses 'L->top' set by previous instruction (when B == 0)
 ** bit 6: instruction sets 'L->top' for next instruction (when C == 0)
 ** bit 7: instruction is an MM instruction (call a metamethod)
 */

 LUAI_DDEC(const lu_byte luaP_opmodes[NUM_OPCODES];)

 #define getOpMode(m)	(cast(enum OpMode, luaP_opmodes[m] & 7))
 #define testAMode(m)	(luaP_opmodes[m] & (1 << 3))
 #define testTMode(m)	(luaP_opmodes[m] & (1 << 4))
 #define testITMode(m)	(luaP_opmodes[m] & (1 << 5))
 #define testOTMode(m)	(luaP_opmodes[m] & (1 << 6))
 #define testMMMode(m)	(luaP_opmodes[m] & (1 << 7))

 /* "out top" (set top for next instruction) */
 #define isOT(i)  \
 	((testOTMode(GET_OPCODE(i)) && GETARG_C(i) == 0) || \
           GET_OPCODE(i) == OP_TAILCALL)

 /* "in top" (uses top from previous instruction) */
 #define isIT(i)		(testITMode(GET_OPCODE(i)) && GETARG_B(i) == 0)

 #define opmode(mm,ot,it,t,a,m)  \
     (((mm) << 7) | ((ot) << 6) | ((it) << 5) | ((t) << 4) | ((a) << 3) | (m))


 /* number of list items to accumulate before a SETLIST instruction */
 #define LFIELDS_PER_FLUSH	50

 #endif
	/*
	** $Id: lopcodes.h $
	** 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 32-bit integers.
	All instructions have an opcode in the first 7 bits.
	Instructions can have the following formats:

	3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
	1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
	iABC C(8) \| B(8) \|k\| A(8) \| Op(7) \|
	iABx Bx(17) \| A(8) \| Op(7) \|
	iAsBx sBx (signed)(17) \| A(8) \| Op(7) \|
	iAx Ax(25) \| Op(7) \|
	isJ sJ(25) \| Op(7) \|

	A signed argument is represented in excess K: the represented value is
	the written unsigned value minus K, where K is half the maximum for the
	corresponding unsigned argument.
	===========================================================================*/


	enum OpMode {iABC, iABx, iAsBx, iAx, isJ}; /* basic instruction formats */


	/*
	** size and position of opcode arguments.
	*/
	#define SIZE_C 8
	#define SIZE_B 8
	#define SIZE_Bx (SIZE_C + SIZE_B + 1)
	#define SIZE_A 8
	#define SIZE_Ax (SIZE_Bx + SIZE_A)
	#define SIZE_sJ (SIZE_Bx + SIZE_A)

	#define SIZE_OP 7

	#define POS_OP 0

	#define POS_A (POS_OP + SIZE_OP)
	#define POS_k (POS_A + SIZE_A)
	#define POS_B (POS_k + 1)
	#define POS_C (POS_B + SIZE_B)

	#define POS_Bx POS_k

	#define POS_Ax POS_A

	#define POS_sJ POS_A


	/*
	** limits for opcode arguments.
	** we use (signed) 'int' to manipulate most arguments,
	** so they must fit in ints.
	*/

	/* Check whether type 'int' has at least 'b' bits ('b' < 32) */
	#define L_INTHASBITS(b) ((UINT_MAX >> ((b) - 1)) >= 1)


	#if L_INTHASBITS(SIZE_Bx)
	#define MAXARG_Bx ((1<<SIZE_Bx)-1)
	#else
	#define MAXARG_Bx MAX_INT
	#endif

	#define OFFSET_sBx (MAXARG_Bx>>1) /* 'sBx' is signed */


	#if L_INTHASBITS(SIZE_Ax)
	#define MAXARG_Ax ((1<<SIZE_Ax)-1)
	#else
	#define MAXARG_Ax MAX_INT
	#endif

	#if L_INTHASBITS(SIZE_sJ)
	#define MAXARG_sJ ((1 << SIZE_sJ) - 1)
	#else
	#define MAXARG_sJ MAX_INT
	#endif

	#define OFFSET_sJ (MAXARG_sJ >> 1)


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

	#define int2sC(i) ((i) + OFFSET_sC)
	#define sC2int(i) ((i) - OFFSET_sC)


	/* 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 checkopm(i,m) (getOpMode(GET_OPCODE(i)) == m)


	#define getarg(i,pos,size) (cast_int(((i)>>(pos)) & MASK1(size,0)))
	#define setarg(i,v,pos,size) ((i) = (((i)&MASK0(size,pos)) \| \
	((cast(Instruction, v)<<pos)&MASK1(size,pos))))

	#define GETARG_A(i) getarg(i, POS_A, SIZE_A)
	#define SETARG_A(i,v) setarg(i, v, POS_A, SIZE_A)

	#define GETARG_B(i) check_exp(checkopm(i, iABC), getarg(i, POS_B, SIZE_B))
	#define GETARG_sB(i) sC2int(GETARG_B(i))
	#define SETARG_B(i,v) setarg(i, v, POS_B, SIZE_B)

	#define GETARG_C(i) check_exp(checkopm(i, iABC), getarg(i, POS_C, SIZE_C))
	#define GETARG_sC(i) sC2int(GETARG_C(i))
	#define SETARG_C(i,v) setarg(i, v, POS_C, SIZE_C)

	#define TESTARG_k(i) check_exp(checkopm(i, iABC), (cast_int(((i) & (1u << POS_k)))))
	#define GETARG_k(i) check_exp(checkopm(i, iABC), getarg(i, POS_k, 1))
	#define SETARG_k(i,v) setarg(i, v, POS_k, 1)

	#define GETARG_Bx(i) check_exp(checkopm(i, iABx), getarg(i, POS_Bx, SIZE_Bx))
	#define SETARG_Bx(i,v) setarg(i, v, POS_Bx, SIZE_Bx)

	#define GETARG_Ax(i) check_exp(checkopm(i, iAx), getarg(i, POS_Ax, SIZE_Ax))
	#define SETARG_Ax(i,v) setarg(i, v, POS_Ax, SIZE_Ax)

	#define GETARG_sBx(i) \
	check_exp(checkopm(i, iAsBx), getarg(i, POS_Bx, SIZE_Bx) - OFFSET_sBx)
	#define SETARG_sBx(i,b) SETARG_Bx((i),cast_uint((b)+OFFSET_sBx))

	#define GETARG_sJ(i) \
	check_exp(checkopm(i, isJ), getarg(i, POS_sJ, SIZE_sJ) - OFFSET_sJ)
	#define SETARG_sJ(i,j) \
	setarg(i, cast_uint((j)+OFFSET_sJ), POS_sJ, SIZE_sJ)


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

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

	#define CREATE_Ax(o,a) ((cast(Instruction, o)<<POS_OP) \
	\| (cast(Instruction, a)<<POS_Ax))

	#define CREATE_sJ(o,j,k) ((cast(Instruction, o) << POS_OP) \
	\| (cast(Instruction, j) << POS_sJ) \
	\| (cast(Instruction, k) << POS_k))


	#if !defined(MAXINDEXRK) /* (for debugging only) */
	#define MAXINDEXRK MAXARG_B
	#endif


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


	/*
	** R[x] - register
	** K[x] - constant (in constant table)
	** RK(x) == if k(i) then K[x] else R[x]
	*/


	/*
	** Grep "ORDER OP" if you change these enums. Opcodes marked with a (*)
	** has extra descriptions in the notes after the enumeration.
	*/

	typedef enum {
	/*----------------------------------------------------------------------
	name args description
	------------------------------------------------------------------------*/
	OP_MOVE,/* A B R[A] := R[B] */
	OP_LOADI,/* A sBx R[A] := sBx */
	OP_LOADF,/* A sBx R[A] := (lua_Number)sBx */
	OP_LOADK,/* A Bx R[A] := K[Bx] */
	OP_LOADKX,/* A R[A] := K[extra arg] */
	OP_LOADFALSE,/* A R[A] := false */
	OP_LFALSESKIP,/A R[A] := false; pc++ () */
	OP_LOADTRUE,/* A R[A] := true */
	OP_LOADNIL,/* A B R[A], R[A+1], ..., R[A+B] := nil */
	OP_GETUPVAL,/* A B R[A] := UpValue[B] */
	OP_SETUPVAL,/* A B UpValue[B] := R[A] */

	OP_GETTABUP,/* A B C R[A] := UpValue[B][K[C]:string] */
	OP_GETTABLE,/* A B C R[A] := R[B][R[C]] */
	OP_GETI,/* A B C R[A] := R[B][C] */
	OP_GETFIELD,/* A B C R[A] := R[B][K[C]:string] */

	OP_SETTABUP,/* A B C UpValue[A][K[B]:string] := RK(C) */
	OP_SETTABLE,/* A B C R[A][R[B]] := RK(C) */
	OP_SETI,/* A B C R[A][B] := RK(C) */
	OP_SETFIELD,/* A B C R[A][K[B]:string] := RK(C) */

	OP_NEWTABLE,/* A B C k R[A] := {} */

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

	OP_ADDI,/* A B sC R[A] := R[B] + sC */

	OP_ADDK,/* A B C R[A] := R[B] + K[C]:number */
	OP_SUBK,/* A B C R[A] := R[B] - K[C]:number */
	OP_MULK,/* A B C R[A] := R[B] * K[C]:number */
	OP_MODK,/* A B C R[A] := R[B] % K[C]:number */
	OP_POWK,/* A B C R[A] := R[B] ^ K[C]:number */
	OP_DIVK,/* A B C R[A] := R[B] / K[C]:number */
	OP_IDIVK,/* A B C R[A] := R[B] // K[C]:number */

	OP_BANDK,/* A B C R[A] := R[B] & K[C]:integer */
	OP_BORK,/* A B C R[A] := R[B] \| K[C]:integer */
	OP_BXORK,/* A B C R[A] := R[B] ~ K[C]:integer */

	OP_SHRI,/* A B sC R[A] := R[B] >> sC */
	OP_SHLI,/* A B sC R[A] := sC << R[B] */

	OP_ADD,/* A B C R[A] := R[B] + R[C] */
	OP_SUB,/* A B C R[A] := R[B] - R[C] */
	OP_MUL,/* A B C R[A] := R[B] * R[C] */
	OP_MOD,/* A B C R[A] := R[B] % R[C] */
	OP_POW,/* A B C R[A] := R[B] ^ R[C] */
	OP_DIV,/* A B C R[A] := R[B] / R[C] */
	OP_IDIV,/* A B C R[A] := R[B] // R[C] */

	OP_BAND,/* A B C R[A] := R[B] & R[C] */
	OP_BOR,/* A B C R[A] := R[B] \| R[C] */
	OP_BXOR,/* A B C R[A] := R[B] ~ R[C] */
	OP_SHL,/* A B C R[A] := R[B] << R[C] */
	OP_SHR,/* A B C R[A] := R[B] >> R[C] */

	OP_MMBIN,/* A B C call C metamethod over R[A] and R[B] () /
	OP_MMBINI,/* A sB C k call C metamethod over R[A] and sB */
	OP_MMBINK,/* A B C k call C metamethod over R[A] and K[B] */

	OP_UNM,/* A B R[A] := -R[B] */
	OP_BNOT,/* A B R[A] := ~R[B] */
	OP_NOT,/* A B R[A] := not R[B] */
	OP_LEN,/* A B R[A] := #R[B] (length operator) */

	OP_CONCAT,/* A B R[A] := R[A].. ... ..R[A + B - 1] */

	OP_CLOSE,/* A close all upvalues >= R[A] */
	OP_TBC,/* A mark variable A "to be closed" */
	OP_JMP,/* sJ pc += sJ */
	OP_EQ,/* A B k if ((R[A] == R[B]) ~= k) then pc++ */
	OP_LT,/* A B k if ((R[A] < R[B]) ~= k) then pc++ */
	OP_LE,/* A B k if ((R[A] <= R[B]) ~= k) then pc++ */

	OP_EQK,/* A B k if ((R[A] == K[B]) ~= k) then pc++ */
	OP_EQI,/* A sB k if ((R[A] == sB) ~= k) then pc++ */
	OP_LTI,/* A sB k if ((R[A] < sB) ~= k) then pc++ */
	OP_LEI,/* A sB k if ((R[A] <= sB) ~= k) then pc++ */
	OP_GTI,/* A sB k if ((R[A] > sB) ~= k) then pc++ */
	OP_GEI,/* A sB k if ((R[A] >= sB) ~= k) then pc++ */

	OP_TEST,/* A k if (not R[A] == k) then pc++ */
	OP_TESTSET,/* A B k if (not R[B] == k) then pc++ else R[A] := R[B] () /

	OP_CALL,/* A B C R[A], ... ,R[A+C-2] := R[A](R[A+1], ... ,R[A+B-1]) */
	OP_TAILCALL,/* A B C k return R[A](R[A+1], ... ,R[A+B-1]) */

	OP_RETURN,/* A B C k return R[A], ... ,R[A+B-2] (see note) */
	OP_RETURN0,/* return */
	OP_RETURN1,/* A return R[A] */

	OP_FORLOOP,/* A Bx update counters; if loop continues then pc-=Bx; */
	OP_FORPREP,/* A Bx <check values and prepare counters>;
	if not to run then pc+=Bx+1; */

	OP_TFORPREP,/* A Bx create upvalue for R[A + 3]; pc+=Bx */
	OP_TFORCALL,/* A C R[A+4], ... ,R[A+3+C] := R[A](R[A+1], R[A+2]); */
	OP_TFORLOOP,/* A Bx if R[A+2] ~= nil then { R[A]=R[A+2]; pc -= Bx } */

	OP_SETLIST,/* A B C k R[A][C+i] := R[A+i], 1 <= i <= B */

	OP_CLOSURE,/* A Bx R[A] := closure(KPROTO[Bx]) */

	OP_VARARG,/* A C R[A], R[A+1], ..., R[A+C-2] = vararg */

	OP_VARARGPREP,/A (adjust vararg parameters) /

	OP_EXTRAARG/* Ax extra (larger) argument for previous opcode */
	} OpCode;


	#define NUM_OPCODES ((int)(OP_EXTRAARG) + 1)



	/*===========================================================================
	Notes:

	(*) Opcode OP_LFALSESKIP is used to convert a condition to a boolean
	value, in a code equivalent to (not cond ? false : true). (It
	produces false and skips the next instruction producing true.)

	(*) Opcodes OP_MMBIN and variants follow each arithmetic and
	bitwise opcode. If the operation succeeds, it skips this next
	opcode. Otherwise, this opcode calls the corresponding metamethod.

	(*) Opcode OP_TESTSET is used in short-circuit expressions that need
	both to jump and to produce a value, such as (a = b or c).

	(*) In OP_CALL, if (B == 0) then B = top - A. If (C == 0), then
	'top' is set to last_result+1, so next open instruction (OP_CALL,
	OP_RETURN*, OP_SETLIST) may use 'top'.

	(*) In OP_VARARG, if (C == 0) then use actual number of varargs and
	set top (like in OP_CALL with C == 0).

	(*) In OP_RETURN, if (B == 0) then return up to 'top'.

	(*) In OP_LOADKX and OP_NEWTABLE, the next instruction is always
	OP_EXTRAARG.

	(*) In OP_SETLIST, if (B == 0) then real B = 'top'; if k, then
	real C = EXTRAARG _ C (the bits of EXTRAARG concatenated with the
	bits of C).

	(*) In OP_NEWTABLE, B is log2 of the hash size (which is always a
	power of 2) plus 1, or zero for size zero. If not k, the array size
	is C. Otherwise, the array size is EXTRAARG _ C.

	(*) For comparisons, k specifies what condition the test should accept
	(true or false).

	(*) In OP_MMBINI/OP_MMBINK, k means the arguments were flipped
	(the constant is the first operand).

	(*) All 'skips' (pc++) assume that next instruction is a jump.

	(*) In instructions OP_RETURN/OP_TAILCALL, 'k' specifies that the
	function builds upvalues, which may need to be closed. C > 0 means
	the function is vararg, so that its 'func' must be corrected before
	returning; in this case, (C - 1) is its number of fixed parameters.

	(*) In comparisons with an immediate operand, C signals whether the
	original operand was a float. (It must be corrected in case of
	metamethods.)

	===========================================================================*/


	/*
	** masks for instruction properties. The format is:
	** bits 0-2: op mode
	** bit 3: instruction set register A
	** bit 4: operator is a test (next instruction must be a jump)
	** bit 5: instruction uses 'L->top' set by previous instruction (when B == 0)
	** bit 6: instruction sets 'L->top' for next instruction (when C == 0)
	** bit 7: instruction is an MM instruction (call a metamethod)
	*/

	LUAI_DDEC(const lu_byte luaP_opmodes[NUM_OPCODES];)

	#define getOpMode(m) (cast(enum OpMode, luaP_opmodes[m] & 7))
	#define testAMode(m) (luaP_opmodes[m] & (1 << 3))
	#define testTMode(m) (luaP_opmodes[m] & (1 << 4))
	#define testITMode(m) (luaP_opmodes[m] & (1 << 5))
	#define testOTMode(m) (luaP_opmodes[m] & (1 << 6))
	#define testMMMode(m) (luaP_opmodes[m] & (1 << 7))

	/* "out top" (set top for next instruction) */
	#define isOT(i) \
	((testOTMode(GET_OPCODE(i)) && GETARG_C(i) == 0) \|\| \
	GET_OPCODE(i) == OP_TAILCALL)

	/* "in top" (uses top from previous instruction) */
	#define isIT(i) (testITMode(GET_OPCODE(i)) && GETARG_B(i) == 0)

	#define opmode(mm,ot,it,t,a,m) \
	(((mm) << 7) \| ((ot) << 6) \| ((it) << 5) \| ((t) << 4) \| ((a) << 3) \| (m))


	/* number of list items to accumulate before a SETLIST instruction */
	#define LFIELDS_PER_FLUSH 50

	#endif