mirror of
https://github.com/lua/lua.git
synced 2024-11-24 02:33:48 +08:00
264 lines
7.6 KiB
C
264 lines
7.6 KiB
C
/*
|
|
** $Id: lopcodes.h,v 1.109 2004/05/31 18:51:50 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.
|
|
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_C (POS_A + SIZE_A)
|
|
#define POS_B (POS_C + SIZE_C)
|
|
#define POS_Bx POS_C
|
|
#define POS_A SIZE_OP
|
|
|
|
|
|
/*
|
|
** limits for opcode arguments.
|
|
** we use (signed) int to manipulate most arguments,
|
|
** so they must fit in LUA_BITSINT-1 bits (-1 for sign)
|
|
*/
|
|
#if SIZE_Bx < LUA_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)&MASK1(SIZE_OP,0)))
|
|
#define SET_OPCODE(i,o) ((i) = (((i)&MASK0(SIZE_OP,0)) | cast(Instruction, o)))
|
|
|
|
#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) \
|
|
| (cast(Instruction, a)<<POS_A) \
|
|
| (cast(Instruction, b)<<POS_B) \
|
|
| (cast(Instruction, c)<<POS_C))
|
|
|
|
#define CREATE_ABx(o,a,bc) (cast(Instruction, o) \
|
|
| (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_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_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 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 */
|
|
OP_FORPREP,/* A sBx R(A)-=R(A+2); pc+=sBx */
|
|
|
|
OP_TFORLOOP,/* A C R(A+2), ... ,R(A+2+C) := R(A)(R(A+1), R(A+2));
|
|
if R(A+2) ~= nil then pc++ */
|
|
OP_TFORPREP,/* A sBx if type(R(A)) == table then R(A+1):=R(A), R(A):=next;
|
|
pc+=sBx */
|
|
|
|
OP_SETLIST,/* A Bx R(A)[Bx-Bx%FPF+i] := R(A+i), 1 <= i <= Bx%FPF+1 */
|
|
OP_SETLISTO,/* A Bx */
|
|
|
|
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).
|
|
|
|
(*) In OP_RETURN, if (B == 0) then return up to `top'
|
|
|
|
(*) For comparisons, B specifies what conditions the test should accept.
|
|
|
|
(*) 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 */
|
|
};
|
|
|
|
extern 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))
|
|
|
|
|
|
extern const char *const luaP_opnames[NUM_OPCODES]; /* opcode names */
|
|
|
|
|
|
/* number of list items to accumulate before a SETLIST instruction */
|
|
/* (must be a power of 2) */
|
|
#define LFIELDS_PER_FLUSH 32
|
|
|
|
|
|
#endif
|