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/*
** $Id: lopcodes.h,v 1.42 2000/03/02 12:32:53 roberto Exp roberto $
** Opcodes for Lua virtual machine
** See Copyright Notice in lua.h
*/
#ifndef lopcodes_h
#define lopcodes_h
/*===========================================================================
We assume that instructions are unsigned numbers with 4 bytes.
All instructions have an opcode in the lower byte. Moreover,
an instruction can have 0, 1, or 2 arguments. There are 4 types of
Instructions:
type 0: no arguments
type 1: 1 unsigned argument in the higher 24 bits (called `U')
type 2: 1 signed argument in the higher 24 bits (`S')
type 3: 1st unsigned argument in the higher 16 bits (`A')
2nd unsigned argument in the middle 8 bits (`B')
The signed argument is represented in excess 2^23; that is, the real value
is the usigned value minus 2^23.
===========================================================================*/
#define EXCESS_S (1<<23) /* == 2^23 */
/*
** the following macros help to manipulate instructions
*/
#define MAXARG_U ((1<<24)-1)
#define MAXARG_S ((1<<23)-1)
#define MAXARG_A ((1<<16)-1)
#define MAXARG_B ((1<<8)-1)
#define GET_OPCODE(i) ((OpCode)((i)&0xFF))
#define GETARG_U(i) ((int)((i)>>8))
#define GETARG_S(i) ((int)((i)>>8)-EXCESS_S)
#define GETARG_A(i) ((int)((i)>>16))
#define GETARG_B(i) ((int)(((i)>>8) & 0xFF))
#define SET_OPCODE(i,o) (((i)&0xFFFFFF00u) | (Instruction)(o))
#define SETARG_U(i,u) (((i)&0x000000FFu) | ((Instruction)(u)<<8))
#define SETARG_S(i,s) (((i)&0x000000FFu) | ((Instruction)((s)+EXCESS_S)<<8))
#define SETARG_A(i,a) (((i)&0x0000FFFFu) | ((Instruction)(a)<<16))
#define SETARG_B(i,b) (((i)&0xFFFF00FFu) | ((Instruction)(b)<<8))
/*
** K = U argument used as index to `kstr'
** J = S argument used as jump offset (relative to pc of next instruction)
** L = U argument used as index of local variable
** N = U argument used as index to `knum'
*/
typedef enum {
/*----------------------------------------------------------------------
name args stack before stack after side effects
------------------------------------------------------------------------*/
ENDCODE,/* - - (return) */
RETCODE,/* U - (return) */
CALL,/* A B v_n-v_1 f(at a) r_b-r_1 f(v1,...,v_n) */
TAILCALL,/* A B v_a-v_1 f (return) f(v1,...,v_a) */
PUSHNIL,/* U - nil_0-nil_u */
POP,/* U a_u-a_1 - */
PUSHINT,/* S - (real)s */
PUSHSTRING,/* K - KSTR[k] */
PUSHNUM,/* N - KNUM[u] */
PUSHNEGNUM,/* N - -KNUM[u] */
PUSHUPVALUE,/* U - Closure[u] */
PUSHLOCAL,/* L - LOC[u] */
GETGLOBAL,/* K - VAR[KSTR[k]] */
GETTABLE,/* - i t t[i] */
GETDOTTED,/* K t t[KSTR[k]] */
PUSHSELF,/* K t t t[KSTR[k]] */
CREATETABLE,/* U - newarray(size = u) */
SETLOCAL,/* L x - LOC[u]=x */
SETGLOBAL,/* K x - VAR[KSTR[k]]=x */
SETTABLEPOP,/* - v i t - t[i]=v */
SETTABLE,/* U v a_u-a_1 i t a_u-a_1 i t t[i]=v */
SETLIST,/* A B v_b-v_0 t t t[i+a*FPF]=v_i */
SETMAP,/* U v_u k_u - v_0 k_0 t t t[k_i]=v_i */
NEQOP,/* - y x (x~=y)? 1 : nil */
EQOP,/* - y x (x==y)? 1 : nil */
LTOP,/* - y x (x<y)? 1 : nil */
LEOP,/* - y x (x<y)? 1 : nil */
GTOP,/* - y x (x>y)? 1 : nil */
GEOP,/* - y x (x>=y)? 1 : nil */
ADDOP,/* - y x x+y */
ADDI,/* S x x+s */
SUBOP,/* - y x x-y */
MULTOP,/* - y x x*y */
DIVOP,/* - y x x/y */
POWOP,/* - y x x^y */
CONCOP,/* - y x x..y */
MINUSOP,/* - x -x */
NOTOP,/* - x (x==nil)? 1 : nil */
ONTJMP,/* J x (x!=nil)? x : - (x!=nil)? PC+=s */
ONFJMP,/* J x (x==nil)? x : - (x==nil)? PC+=s */
JMP,/* J - - PC+=s */
IFTJMP,/* J x - (x!=nil)? PC+=s */
IFFJMP,/* J x - (x==nil)? PC+=s */
CLOSURE,/* A B v_b-v_1 closure(CNST[a], v_b-v_1) */
SETLINE/* U - - LINE=u */
} OpCode;
#define RFIELDS_PER_FLUSH 32 /* records (SETMAP) */
#define LFIELDS_PER_FLUSH 64 /* FPF - lists (SETLIST) (<=MAXARG_B) */
#endif
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