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"

            
            #include "lobject.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)     |

            
            ivABC         vC(10)     |     vB(6)   |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 (signed)(25)            |   Op(7)     |


              ('v' stands for "variant", 's' for "signed", 'x' for "extended".)

            
              A signed argument is represented in excess K: The represented value is

            
              the written unsigned value minus K, where K is half (rounded down) the

            
              maximum value for the corresponding unsigned argument.

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


            /* basic instruction formats */

            
            enum OpMode {iABC, ivABC, iABx, iAsBx, iAx, isJ};


            /*

            
            ** size and position of opcode arguments.

            
            */

            
            #define SIZE_C		8

            
            #define SIZE_vC		10

            
            #define SIZE_B		8

            
            #define SIZE_vB		6

            
            #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_vB		(POS_k + 1)

            
            #define POS_C		(POS_B + SIZE_B)

            
            #define POS_vC		(POS_vB + SIZE_vB)


            #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' + 1 bits.

            
            ** 'b' < 32; +1 for the sign bit.

            
            */

            
            #define L_INTHASBITS(b)		((UINT_MAX >> (b)) >= 1)


            #if L_INTHASBITS(SIZE_Bx)

            
            #define MAXARG_Bx	((1<<SIZE_Bx)-1)

            
            #else

            
            #define MAXARG_Bx	INT_MAX

            
            #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	INT_MAX

            
            #endif


            #if L_INTHASBITS(SIZE_sJ)

            
            #define MAXARG_sJ	((1 << SIZE_sJ) - 1)

            
            #else

            
            #define MAXARG_sJ	INT_MAX

            
            #endif


            #define OFFSET_sJ	(MAXARG_sJ >> 1)


            #define MAXARG_A	((1<<SIZE_A)-1)

            
            #define MAXARG_B	((1<<SIZE_B)-1)

            
            #define MAXARG_vB	((1<<SIZE_vB)-1)

            
            #define MAXARG_C	((1<<SIZE_C)-1)

            
            #define MAXARG_vC	((1<<SIZE_vC)-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_Inst(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_Inst(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_vB(i)  \

            
            	check_exp(checkopm(i, ivABC), getarg(i, POS_vB, SIZE_vB))

            
            #define GETARG_sB(i)	sC2int(GETARG_B(i))

            
            #define SETARG_B(i,v)	setarg(i, v, POS_B, SIZE_B)

            
            #define SETARG_vB(i,v)	setarg(i, v, POS_vB, SIZE_vB)


            #define GETARG_C(i)  \

            
            	check_exp(checkopm(i, iABC), getarg(i, POS_C, SIZE_C))

            
            #define GETARG_vC(i)  \

            
            	check_exp(checkopm(i, ivABC), getarg(i, POS_vC, SIZE_vC))

            
            #define GETARG_sC(i)	sC2int(GETARG_C(i))

            
            #define SETARG_C(i,v)	setarg(i, v, POS_C, SIZE_C)

            
            #define SETARG_vC(i,v)	setarg(i, v, POS_vC, SIZE_vC)


            #define TESTARG_k(i)	(cast_int(((i) & (1u << POS_k))))

            
            #define GETARG_k(i)	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_Inst(o)<<POS_OP) \

            
            			| (cast_Inst(a)<<POS_A) \

            
            			| (cast_Inst(b)<<POS_B) \

            
            			| (cast_Inst(c)<<POS_C) \

            
            			| (cast_Inst(k)<<POS_k))


            #define CREATE_vABCk(o,a,b,c,k)	((cast_Inst(o)<<POS_OP) \

            
            			| (cast_Inst(a)<<POS_A) \

            
            			| (cast_Inst(b)<<POS_vB) \

            
            			| (cast_Inst(c)<<POS_vC) \

            
            			| (cast_Inst(k)<<POS_k))


            #define CREATE_ABx(o,a,bc)	((cast_Inst(o)<<POS_OP) \

            
            			| (cast_Inst(a)<<POS_A) \

            
            			| (cast_Inst(bc)<<POS_Bx))


            #define CREATE_Ax(o,a)		((cast_Inst(o)<<POS_OP) \

            
            			| (cast_Inst(a)<<POS_Ax))


            #define CREATE_sJ(o,j,k)	((cast_Inst(o) << POS_OP) \

            
            			| (cast_Inst(j) << POS_sJ) \

            
            			| (cast_Inst(k) << POS_k))


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

            
            #define MAXINDEXRK	MAXARG_B

            
            #endif


            /*

            
            ** Maximum size for the stack of a Lua function. It must fit in 8 bits.

            
            ** The highest valid register is one less than this value.

            
            */

            
            #define MAX_FSTACK	MAXARG_A


            /*

            
            ** Invalid register (one more than last valid register).

            
            */

            
            #define NO_REG		MAX_FSTACK


            /*

            
            ** 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 this enum.

            
            ** See "Notes" below for more information about some instructions.

            
            */


            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]:shortstring]		*/

            
            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]:shortstring]			*/


            OP_SETTABUP,/*	A B C	UpValue[A][K[B]:shortstring] := 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]:shortstring] := RK(C)			*/


            OP_NEWTABLE,/*	A vB vC k	R[A] := {}				*/


            OP_SELF,/*	A B C	R[A+1] := R[B]; R[A] := R[B][K[C]:shortstring]	*/


            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_SHLI,/*	A B sC	R[A] := sC << R[B]				*/

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


            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]			*/

            
            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 vB vC k	R[A][vC+i] := R[A+i], 1 <= i <= vB	*/


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


            OP_VARARG,/*	A B C k	R[A], ..., R[A+C-2] = varargs  			*/


            OP_GETVARG, /* A B C	R[A] := R[B][R[C]], R[B] is vararg parameter    */


            OP_ERRNNIL,/*	A Bx	raise error if R[A] ~= nil (K[Bx - 1] is global name)*/


            OP_VARARGPREP,/* 	(adjust varargs)				*/


            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). 'k' means function has a

            
              vararg table, which is in R[B].


              (*) 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, vB 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 vC. Otherwise, the array size is EXTRAARG _ vC.


              (*) In OP_ERRNNIL, (Bx == 0) means index of global name doesn't

            
              fit in Bx. (So, that name is not available for the error message.)


              (*) 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 comparison and test instructions assume that the instruction

            
              being skipped (pc++) 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 has hidden vararg arguments, 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: used by 'luaP_isIT'

            
            ** bit 6: used by 'luaP_isOT'

            
            ** 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 testMMMode(m)	(luaP_opmodes[m] & (1 << 7))


            /* Check whether instruction sets top for next instruction, that is,

            
            ** it results in multiple values. Used only for tests.

            
            */

            
            #define luaP_isOT(i)  \

            
            	(GET_OPCODE(i) == OP_TAILCALL || \

            
            	 ((luaP_opmodes[GET_OPCODE(i)] & (1 << 6)) && GETARG_C(i) == 0))


            LUAI_FUNC int luaP_isIT (Instruction i);


            #endif
	/*
	** $Id: lopcodes.h $
	** Opcodes for Lua virtual machine
	** See Copyright Notice in lua.h
	*/

	#ifndef lopcodes_h
	#define lopcodes_h

	#include "llimits.h"
	#include "lobject.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) \|
	ivABC vC(10) \| vB(6) \|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 (signed)(25) \| Op(7) \|

	('v' stands for "variant", 's' for "signed", 'x' for "extended".)
	A signed argument is represented in excess K: The represented value is
	the written unsigned value minus K, where K is half (rounded down) the
	maximum value for the corresponding unsigned argument.
	===========================================================================*/


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


	/*
	** size and position of opcode arguments.
	*/
	#define SIZE_C 8
	#define SIZE_vC 10
	#define SIZE_B 8
	#define SIZE_vB 6
	#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_vB (POS_k + 1)
	#define POS_C (POS_B + SIZE_B)
	#define POS_vC (POS_vB + SIZE_vB)

	#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' + 1 bits.
	** 'b' < 32; +1 for the sign bit.
	*/
	#define L_INTHASBITS(b) ((UINT_MAX >> (b)) >= 1)


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

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

	#define OFFSET_sJ (MAXARG_sJ >> 1)


	#define MAXARG_A ((1<<SIZE_A)-1)
	#define MAXARG_B ((1<<SIZE_B)-1)
	#define MAXARG_vB ((1<<SIZE_vB)-1)
	#define MAXARG_C ((1<<SIZE_C)-1)
	#define MAXARG_vC ((1<<SIZE_vC)-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_Inst(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_Inst(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_vB(i) \
	check_exp(checkopm(i, ivABC), getarg(i, POS_vB, SIZE_vB))
	#define GETARG_sB(i) sC2int(GETARG_B(i))
	#define SETARG_B(i,v) setarg(i, v, POS_B, SIZE_B)
	#define SETARG_vB(i,v) setarg(i, v, POS_vB, SIZE_vB)

	#define GETARG_C(i) \
	check_exp(checkopm(i, iABC), getarg(i, POS_C, SIZE_C))
	#define GETARG_vC(i) \
	check_exp(checkopm(i, ivABC), getarg(i, POS_vC, SIZE_vC))
	#define GETARG_sC(i) sC2int(GETARG_C(i))
	#define SETARG_C(i,v) setarg(i, v, POS_C, SIZE_C)
	#define SETARG_vC(i,v) setarg(i, v, POS_vC, SIZE_vC)

	#define TESTARG_k(i) (cast_int(((i) & (1u << POS_k))))
	#define GETARG_k(i) 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_Inst(o)<<POS_OP) \
	\| (cast_Inst(a)<<POS_A) \
	\| (cast_Inst(b)<<POS_B) \
	\| (cast_Inst(c)<<POS_C) \
	\| (cast_Inst(k)<<POS_k))

	#define CREATE_vABCk(o,a,b,c,k) ((cast_Inst(o)<<POS_OP) \
	\| (cast_Inst(a)<<POS_A) \
	\| (cast_Inst(b)<<POS_vB) \
	\| (cast_Inst(c)<<POS_vC) \
	\| (cast_Inst(k)<<POS_k))

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

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

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


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


	/*
	** Maximum size for the stack of a Lua function. It must fit in 8 bits.
	** The highest valid register is one less than this value.
	*/
	#define MAX_FSTACK MAXARG_A

	/*
	** Invalid register (one more than last valid register).
	*/
	#define NO_REG MAX_FSTACK



	/*
	** 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 this enum.
	** See "Notes" below for more information about some instructions.
	*/

	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]:shortstring] */
	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]:shortstring] */

	OP_SETTABUP,/* A B C UpValue[A][K[B]:shortstring] := 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]:shortstring] := RK(C) */

	OP_NEWTABLE,/* A vB vC k R[A] := {} */

	OP_SELF,/* A B C R[A+1] := R[B]; R[A] := R[B][K[C]:shortstring] */

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

	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] */
	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 vB vC k R[A][vC+i] := R[A+i], 1 <= i <= vB */

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

	OP_VARARG,/* A B C k R[A], ..., R[A+C-2] = varargs */

	OP_GETVARG, /* A B C R[A] := R[B][R[C]], R[B] is vararg parameter */

	OP_ERRNNIL,/* A Bx raise error if R[A] ~= nil (K[Bx - 1] is global name)*/

	OP_VARARGPREP,/* (adjust varargs) */

	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). 'k' means function has a
	vararg table, which is in R[B].

	(*) 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, vB 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 vC. Otherwise, the array size is EXTRAARG _ vC.

	(*) In OP_ERRNNIL, (Bx == 0) means index of global name doesn't
	fit in Bx. (So, that name is not available for the error message.)

	(*) 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 comparison and test instructions assume that the instruction
	being skipped (pc++) 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 has hidden vararg arguments, 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: used by 'luaP_isIT'
	** bit 6: used by 'luaP_isOT'
	** 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 testMMMode(m) (luaP_opmodes[m] & (1 << 7))


	/* Check whether instruction sets top for next instruction, that is,
	** it results in multiple values. Used only for tests.
	*/
	#define luaP_isOT(i) \
	(GET_OPCODE(i) == OP_TAILCALL \|\| \
	((luaP_opmodes[GET_OPCODE(i)] & (1 << 6)) && GETARG_C(i) == 0))


	LUAI_FUNC int luaP_isIT (Instruction i);


	#endif