lua51 0.1.6

/*
** $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) == 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_TFORLOOP,/*	A C	R(A+3), ... ,R(A+2+C) := R(A)(R(A+1), R(A+2));
                        if R(A+3) ~= nil then R(A+2)=R(A+3) else pc++	*/
    OP_SETLIST,/*	A B C	R(A)[(C-1)*FPF+i] := R(A+i), 1 <= i <= B	*/

    OP_CLOSE,/*	A 	close all variables in the stack up to (>=) R(A)*/
    OP_CLOSURE,/*	A Bx	R(A) := closure(KPROTO[Bx], R(A), ... ,R(A+n))	*/

    OP_VARARG/*	A B	R(A), R(A+1), ..., R(A+B-1) = vararg		*/
} OpCode;


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




/*===========================================================================
  Notes:
  (*) In OP_CALL, if (B == 0) then B = top. C is the number of returns - 1,
      and can be 0: OP_CALL then sets `top' 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 real C

  (*) 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
*/

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_DATA 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_DATA 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