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/*
** $Id: lopcodes.h,v 1.51 2000/03/24 17:26:08 roberto Exp roberto $
** 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. 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 bits (called `U')
type 2: 1 signed argument in the higher bits (`S')
type 3: 1st unsigned argument in the higher bits (`A')
2nd unsigned argument in the middle bits (`B')
The signed argument is represented in excess 2^K; that is, the number
value is the usigned value minus 2^K.
The size of each argument is defined in `llimits.h'. The usual is an
instruction with 32 bits, U and S arguments with 26 bits (32-6), B
argument with 9 bits, and A argument with 17 bits (32-6-9). For small
instalations, the instruction size can be 16, so U and S have 10 bits,
and A and B have 5 bits each.
===========================================================================*/
#define EXCESS_S (1<<(SIZE_S-1)) /* == 2^K */
/* 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) ((OpCode)((i)&MASK1(SIZE_OP,0)))
#define GETARG_U(i) ((int)((i)>>POS_U))
#define GETARG_S(i) ((int)((i)>>POS_S)-EXCESS_S)
#define GETARG_A(i) ((int)((i)>>POS_A))
#define GETARG_B(i) ((int)(((i)>>POS_B) & MASK1(SIZE_B,0)))
#define SET_OPCODE(i,o) ((i) = (((i)&MASK0(SIZE_OP,0)) | (Instruction)(o)))
#define SETARG_U(i,u) ((i) = (((i)&MASK0(SIZE_U,POS_U)) | \
((Instruction)(u)<<POS_U)))
#define SETARG_S(i,s) ((i) = (((i)&MASK0(SIZE_S,POS_S)) | \
((Instruction)((s)+EXCESS_S)<<POS_S)))
#define SETARG_A(i,a) ((i) = (((i)&MASK0(SIZE_A,POS_A)) | \
((Instruction)(a)<<POS_A)))
#define SETARG_B(i,b) ((i) = (((i)&MASK0(SIZE_B,POS_B)) | \
((Instruction)(b)<<POS_B)))
#define CREATE_0(o) ((Instruction)(o))
#define CREATE_U(o,u) ((Instruction)(o) | (Instruction)(u)<<POS_U)
#define CREATE_S(o,s) ((Instruction)(o) | ((Instruction)(s)+EXCESS_S)<<POS_S)
#define CREATE_AB(o,a,b) ((Instruction)(o) | ((Instruction)(a)<<POS_A) \
| ((Instruction)(b)<<POS_B))
/*
** 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
------------------------------------------------------------------------*/
OP_END,/* - - (return) */
OP_RETURN,/* U - (return) */
OP_CALL,/* A B v_n-v_1 f(at a) r_b-r_1 f(v1,...,v_n) */
OP_TAILCALL,/* A B v_n-v_1 f(at a) (return) f(v1,...,v_n) */
OP_PUSHNIL,/* U - nil_1-nil_u */
OP_POP,/* U a_u-a_1 - */
OP_PUSHINT,/* S - (Number)s */
OP_PUSHSTRING,/* K - KSTR[k] */
OP_PUSHNUM,/* N - KNUM[u] */
OP_PUSHNEGNUM,/* N - -KNUM[u] */
OP_PUSHUPVALUE,/* U - Closure[u] */
OP_PUSHLOCAL,/* L - LOC[u] */
OP_GETGLOBAL,/* K - VAR[KSTR[k]] */
OP_GETTABLE,/* - i t t[i] */
OP_GETDOTTED,/* K t t[KSTR[k]] */
OP_PUSHSELF,/* K t t t[KSTR[k]] */
OP_CREATETABLE,/* U - newarray(size = u) */
OP_SETLOCAL,/* L x - LOC[u]=x */
OP_SETGLOBAL,/* K x - VAR[KSTR[k]]=x */
OP_SETTABLEPOP,/* - v i t - t[i]=v */
OP_SETTABLE,/* U v a_u-a_1 i t a_u-a_1 i t t[i]=v */
OP_SETLIST,/* A B v_b-v_0 t t t[i+a*FPF]=v_i */
OP_SETMAP,/* U v_u k_u - v_0 k_0 t t t[k_i]=v_i */
OP_ADD,/* - y x x+y */
OP_ADDI,/* S x x+s */
OP_SUB,/* - y x x-y */
OP_MULT,/* - y x x*y */
OP_DIV,/* - y x x/y */
OP_POW,/* - y x x^y */
OP_CONC,/* U v_u-v_1 v1..-..v_u */
OP_MINUS,/* - x -x */
OP_NOT,/* - x (x==nil)? 1 : nil */
OP_IFNEQJMP,/* J y x - (x~=y)? PC+=s */
OP_IFEQJMP,/* J y x - (x==y)? PC+=s */
OP_IFLTJMP,/* J y x - (x<y)? PC+=s */
OP_IFLEJMP,/* J y x - (x<y)? PC+=s */
OP_IFGTJMP,/* J y x - (x>y)? PC+=s */
OP_IFGEJMP,/* J y x - (x>=y)? PC+=s */
OP_IFTJMP,/* J x - (x!=nil)? PC+=s */
OP_IFFJMP,/* J x - (x==nil)? PC+=s */
OP_ONTJMP,/* J x (x!=nil)? x : - (x!=nil)? PC+=s */
OP_ONFJMP,/* J x (x==nil)? x : - (x==nil)? PC+=s */
OP_JMP,/* J - - PC+=s */
OP_PUSHNILJMP,/* - - nil PC++; */
OP_CLOSURE,/* A B v_b-v_1 closure(CNST[a], v_1-v_b) */
OP_SETLINE/* U - - LINE=u */
} OpCode;
#define ISJUMP(o) (OP_IFNEQJMP <= (o) && (o) <= OP_JMP)
#endif
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