com32/lua/src/lopcodes.h - platform/external/syslinux - Git at Google

 /*
 ** $Id: lopcodes.h,v 1.142.1.1 2013/04/12 18:48:47 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
 	'Ax' : 26 bits ('A', 'B', and 'C' together)
 	`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, iAx};  /* 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_Ax		(SIZE_C + SIZE_B + SIZE_A)

 #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
 #define POS_Ax		POS_A


 /*
 ** 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

 #if SIZE_Ax < LUAI_BITSINT-1
 #define MAXARG_Ax	((1<<SIZE_Ax)-1)
 #else
 #define MAXARG_Ax	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(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)	getarg(i, POS_B, SIZE_B)
 #define SETARG_B(i,v)	setarg(i, v, POS_B, SIZE_B)

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

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

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

 #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))

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


 /*
 ** 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_LOADKX,/*	A 	R(A) := Kst(extra arg)				*/
 OP_LOADBOOL,/*	A B C	R(A) := (Bool)B; if (C) pc++			*/
 OP_LOADNIL,/*	A B	R(A), R(A+1), ..., R(A+B) := nil		*/
 OP_GETUPVAL,/*	A B	R(A) := UpValue[B]				*/

 OP_GETTABUP,/*	A B C	R(A) := UpValue[B][RK(C)]			*/
 OP_GETTABLE,/*	A B C	R(A) := R(B)[RK(C)]				*/

 OP_SETTABUP,/*	A B C	UpValue[A][RK(B)] := RK(C)			*/
 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,/*	A sBx	pc+=sBx; if (A) close all upvalues >= R(A) + 1	*/
 OP_EQ,/*	A B C	if ((RK(B) == RK(C)) ~= A) then pc++		*/
 OP_LT,/*	A B C	if ((RK(B) <  RK(C)) ~= A) then pc++		*/
 OP_LE,/*	A B C	if ((RK(B) <= RK(C)) ~= A) then pc++		*/

 OP_TEST,/*	A C	if not (R(A) <=> C) then pc++			*/
 OP_TESTSET,/*	A B C	if (R(B) <=> C) then R(A) := R(B) else pc++	*/

 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	return R(A)(R(A+1), ... ,R(A+B-1))		*/
 OP_RETURN,/*	A B	return R(A), ... ,R(A+B-2)	(see note)	*/

 OP_FORLOOP,/*	A sBx	R(A)+=R(A+2);
 			if R(A) <?= R(A+1) then { pc+=sBx; R(A+3)=R(A) }*/
 OP_FORPREP,/*	A sBx	R(A)-=R(A+2); pc+=sBx				*/

 OP_TFORCALL,/*	A C	R(A+3), ... ,R(A+2+C) := R(A)(R(A+1), R(A+2));	*/
 OP_TFORLOOP,/*	A sBx	if R(A+1) ~= nil then { R(A)=R(A+1); pc += sBx }*/

 OP_SETLIST,/*	A B C	R(A)[(C-1)*FPF+i] := R(A+i), 1 <= i <= B	*/

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

 OP_VARARG,/*	A B	R(A), R(A+1), ..., R(A+B-2) = vararg		*/

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


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


 /*===========================================================================
   Notes:
   (*) In OP_CALL, if (B == 0) then B = top. 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 (B == 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_SETLIST, if (B == 0) then B = `top'; if (C == 0) then next
   'instruction' is EXTRAARG(real C).

   (*) In OP_LOADKX, the next 'instruction' is always EXTRAARG.

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

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

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


 /*
 ** masks for instruction properties. The format is:
 ** bits 0-1: op mode
 ** bits 2-3: C arg mode
 ** bits 4-5: B arg mode
 ** bit 6: instruction set register A
 ** bit 7: operator is a test (next instruction must be a jump)
 */

 enum OpArgMask {
   OpArgN,  /* argument is not used */
   OpArgU,  /* argument is used */
   OpArgR,  /* argument is a register or a jump offset */
   OpArgK   /* argument is a constant or register/constant */
 };

 LUAI_DDEC const lu_byte luaP_opmodes[NUM_OPCODES];

 #define getOpMode(m)	(cast(enum OpMode, luaP_opmodes[m] & 3))
 #define getBMode(m)	(cast(enum OpArgMask, (luaP_opmodes[m] >> 4) & 3))
 #define getCMode(m)	(cast(enum OpArgMask, (luaP_opmodes[m] >> 2) & 3))
 #define testAMode(m)	(luaP_opmodes[m] & (1 << 6))
 #define testTMode(m)	(luaP_opmodes[m] & (1 << 7))


 LUAI_DDEC const char *const luaP_opnames[NUM_OPCODES+1];  /* opcode names */


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


 #endif
	/*
	** $Id: lopcodes.h,v 1.142.1.1 2013/04/12 18:48:47 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
	'Ax' : 26 bits ('A', 'B', and 'C' together)
	`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, iAx}; /* 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_Ax (SIZE_C + SIZE_B + SIZE_A)

	#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
	#define POS_Ax POS_A


	/*
	** 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

	#if SIZE_Ax < LUAI_BITSINT-1
	#define MAXARG_Ax ((1<<SIZE_Ax)-1)
	#else
	#define MAXARG_Ax 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(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) getarg(i, POS_B, SIZE_B)
	#define SETARG_B(i,v) setarg(i, v, POS_B, SIZE_B)

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

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

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

	#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))

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


	/*
	** 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_LOADKX,/* A R(A) := Kst(extra arg) */
	OP_LOADBOOL,/* A B C R(A) := (Bool)B; if (C) pc++ */
	OP_LOADNIL,/* A B R(A), R(A+1), ..., R(A+B) := nil */
	OP_GETUPVAL,/* A B R(A) := UpValue[B] */

	OP_GETTABUP,/* A B C R(A) := UpValue[B][RK(C)] */
	OP_GETTABLE,/* A B C R(A) := R(B)[RK(C)] */

	OP_SETTABUP,/* A B C UpValue[A][RK(B)] := RK(C) */
	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,/* A sBx pc+=sBx; if (A) close all upvalues >= R(A) + 1 */
	OP_EQ,/* A B C if ((RK(B) == RK(C)) ~= A) then pc++ */
	OP_LT,/* A B C if ((RK(B) < RK(C)) ~= A) then pc++ */
	OP_LE,/* A B C if ((RK(B) <= RK(C)) ~= A) then pc++ */

	OP_TEST,/* A C if not (R(A) <=> C) then pc++ */
	OP_TESTSET,/* A B C if (R(B) <=> C) then R(A) := R(B) else pc++ */

	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 return R(A)(R(A+1), ... ,R(A+B-1)) */
	OP_RETURN,/* A B return R(A), ... ,R(A+B-2) (see note) */

	OP_FORLOOP,/* A sBx R(A)+=R(A+2);
	if R(A) <?= R(A+1) then { pc+=sBx; R(A+3)=R(A) }*/
	OP_FORPREP,/* A sBx R(A)-=R(A+2); pc+=sBx */

	OP_TFORCALL,/* A C R(A+3), ... ,R(A+2+C) := R(A)(R(A+1), R(A+2)); */
	OP_TFORLOOP,/* A sBx if R(A+1) ~= nil then { R(A)=R(A+1); pc += sBx }*/

	OP_SETLIST,/* A B C R(A)[(C-1)FPF+i] := R(A+i), 1 <= i <= B /

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

	OP_VARARG,/* A B R(A), R(A+1), ..., R(A+B-2) = vararg */

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


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



	/*===========================================================================
	Notes:
	(*) In OP_CALL, if (B == 0) then B = top. 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 (B == 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_SETLIST, if (B == 0) then B = `top'; if (C == 0) then next
	'instruction' is EXTRAARG(real C).

	(*) In OP_LOADKX, the next 'instruction' is always EXTRAARG.

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

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

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


	/*
	** masks for instruction properties. The format is:
	** bits 0-1: op mode
	** bits 2-3: C arg mode
	** bits 4-5: B arg mode
	** bit 6: instruction set register A
	** bit 7: operator is a test (next instruction must be a jump)
	*/

	enum OpArgMask {
	OpArgN, /* argument is not used */
	OpArgU, /* argument is used */
	OpArgR, /* argument is a register or a jump offset */
	OpArgK /* argument is a constant or register/constant */
	};

	LUAI_DDEC const lu_byte luaP_opmodes[NUM_OPCODES];

	#define getOpMode(m) (cast(enum OpMode, luaP_opmodes[m] & 3))
	#define getBMode(m) (cast(enum OpArgMask, (luaP_opmodes[m] >> 4) & 3))
	#define getCMode(m) (cast(enum OpArgMask, (luaP_opmodes[m] >> 2) & 3))
	#define testAMode(m) (luaP_opmodes[m] & (1 << 6))
	#define testTMode(m) (luaP_opmodes[m] & (1 << 7))


	LUAI_DDEC const char const luaP_opnames[NUM_OPCODES+1]; / opcode names */


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


	#endif