mirror of https://github.com/lua/lua
406 lines
13 KiB
C
406 lines
13 KiB
C
/*
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** $Id: lopcodes.h $
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** Opcodes for Lua virtual machine
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** See Copyright Notice in lua.h
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*/
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#ifndef lopcodes_h
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#define lopcodes_h
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#include "llimits.h"
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/*===========================================================================
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We assume that instructions are unsigned 32-bit integers.
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All instructions have an opcode in the first 7 bits.
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Instructions can have the following formats:
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3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
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1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
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iABC C(8) | B(8) |k| A(8) | Op(7) |
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iABx Bx(17) | A(8) | Op(7) |
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iAsBx sBx (signed)(17) | A(8) | Op(7) |
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iAx Ax(25) | Op(7) |
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isJ sJ(25) | Op(7) |
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A signed argument is represented in excess K: the represented value is
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the written unsigned value minus K, where K is half the maximum for the
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corresponding unsigned argument.
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===========================================================================*/
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enum OpMode {iABC, iABx, iAsBx, iAx, isJ}; /* basic instruction formats */
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/*
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** size and position of opcode arguments.
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*/
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#define SIZE_C 8
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#define SIZE_B 8
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#define SIZE_Bx (SIZE_C + SIZE_B + 1)
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#define SIZE_A 8
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#define SIZE_Ax (SIZE_Bx + SIZE_A)
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#define SIZE_sJ (SIZE_Bx + SIZE_A)
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#define SIZE_OP 7
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#define POS_OP 0
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#define POS_A (POS_OP + SIZE_OP)
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#define POS_k (POS_A + SIZE_A)
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#define POS_B (POS_k + 1)
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#define POS_C (POS_B + SIZE_B)
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#define POS_Bx POS_k
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#define POS_Ax POS_A
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#define POS_sJ POS_A
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/*
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** limits for opcode arguments.
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** we use (signed) 'int' to manipulate most arguments,
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** so they must fit in ints.
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*/
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/* Check whether type 'int' has at least 'b' bits ('b' < 32) */
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#define L_INTHASBITS(b) ((UINT_MAX >> ((b) - 1)) >= 1)
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#if L_INTHASBITS(SIZE_Bx)
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#define MAXARG_Bx ((1<<SIZE_Bx)-1)
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#else
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#define MAXARG_Bx MAX_INT
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#endif
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#define OFFSET_sBx (MAXARG_Bx>>1) /* 'sBx' is signed */
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#if L_INTHASBITS(SIZE_Ax)
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#define MAXARG_Ax ((1<<SIZE_Ax)-1)
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#else
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#define MAXARG_Ax MAX_INT
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#endif
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#if L_INTHASBITS(SIZE_sJ)
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#define MAXARG_sJ ((1 << SIZE_sJ) - 1)
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#else
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#define MAXARG_sJ MAX_INT
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#endif
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#define OFFSET_sJ (MAXARG_sJ >> 1)
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#define MAXARG_A ((1<<SIZE_A)-1)
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#define MAXARG_B ((1<<SIZE_B)-1)
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#define MAXARG_C ((1<<SIZE_C)-1)
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#define OFFSET_sC (MAXARG_C >> 1)
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#define int2sC(i) ((i) + OFFSET_sC)
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#define sC2int(i) ((i) - OFFSET_sC)
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/* creates a mask with 'n' 1 bits at position 'p' */
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#define MASK1(n,p) ((~((~(Instruction)0)<<(n)))<<(p))
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/* creates a mask with 'n' 0 bits at position 'p' */
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#define MASK0(n,p) (~MASK1(n,p))
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/*
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** the following macros help to manipulate instructions
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*/
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#define GET_OPCODE(i) (cast(OpCode, ((i)>>POS_OP) & MASK1(SIZE_OP,0)))
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#define SET_OPCODE(i,o) ((i) = (((i)&MASK0(SIZE_OP,POS_OP)) | \
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((cast(Instruction, o)<<POS_OP)&MASK1(SIZE_OP,POS_OP))))
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#define checkopm(i,m) (getOpMode(GET_OPCODE(i)) == m)
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#define getarg(i,pos,size) (cast_int(((i)>>(pos)) & MASK1(size,0)))
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#define setarg(i,v,pos,size) ((i) = (((i)&MASK0(size,pos)) | \
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((cast(Instruction, v)<<pos)&MASK1(size,pos))))
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#define GETARG_A(i) getarg(i, POS_A, SIZE_A)
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#define SETARG_A(i,v) setarg(i, v, POS_A, SIZE_A)
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#define GETARG_B(i) check_exp(checkopm(i, iABC), getarg(i, POS_B, SIZE_B))
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#define GETARG_sB(i) sC2int(GETARG_B(i))
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#define SETARG_B(i,v) setarg(i, v, POS_B, SIZE_B)
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#define GETARG_C(i) check_exp(checkopm(i, iABC), getarg(i, POS_C, SIZE_C))
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#define GETARG_sC(i) sC2int(GETARG_C(i))
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#define SETARG_C(i,v) setarg(i, v, POS_C, SIZE_C)
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#define TESTARG_k(i) check_exp(checkopm(i, iABC), (cast_int(((i) & (1u << POS_k)))))
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#define GETARG_k(i) check_exp(checkopm(i, iABC), getarg(i, POS_k, 1))
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#define SETARG_k(i,v) setarg(i, v, POS_k, 1)
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#define GETARG_Bx(i) check_exp(checkopm(i, iABx), getarg(i, POS_Bx, SIZE_Bx))
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#define SETARG_Bx(i,v) setarg(i, v, POS_Bx, SIZE_Bx)
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#define GETARG_Ax(i) check_exp(checkopm(i, iAx), getarg(i, POS_Ax, SIZE_Ax))
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#define SETARG_Ax(i,v) setarg(i, v, POS_Ax, SIZE_Ax)
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#define GETARG_sBx(i) \
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check_exp(checkopm(i, iAsBx), getarg(i, POS_Bx, SIZE_Bx) - OFFSET_sBx)
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#define SETARG_sBx(i,b) SETARG_Bx((i),cast_uint((b)+OFFSET_sBx))
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#define GETARG_sJ(i) \
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check_exp(checkopm(i, isJ), getarg(i, POS_sJ, SIZE_sJ) - OFFSET_sJ)
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#define SETARG_sJ(i,j) \
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setarg(i, cast_uint((j)+OFFSET_sJ), POS_sJ, SIZE_sJ)
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#define CREATE_ABCk(o,a,b,c,k) ((cast(Instruction, o)<<POS_OP) \
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| (cast(Instruction, a)<<POS_A) \
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| (cast(Instruction, b)<<POS_B) \
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| (cast(Instruction, c)<<POS_C) \
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| (cast(Instruction, k)<<POS_k))
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#define CREATE_ABx(o,a,bc) ((cast(Instruction, o)<<POS_OP) \
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| (cast(Instruction, a)<<POS_A) \
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| (cast(Instruction, bc)<<POS_Bx))
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#define CREATE_Ax(o,a) ((cast(Instruction, o)<<POS_OP) \
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| (cast(Instruction, a)<<POS_Ax))
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#define CREATE_sJ(o,j,k) ((cast(Instruction, o) << POS_OP) \
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| (cast(Instruction, j) << POS_sJ) \
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| (cast(Instruction, k) << POS_k))
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#if !defined(MAXINDEXRK) /* (for debugging only) */
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#define MAXINDEXRK MAXARG_B
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#endif
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/*
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** invalid register that fits in 8 bits
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*/
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#define NO_REG MAXARG_A
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/*
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** R[x] - register
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** K[x] - constant (in constant table)
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** RK(x) == if k(i) then K[x] else R[x]
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*/
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/*
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** Grep "ORDER OP" if you change these enums. Opcodes marked with a (*)
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** has extra descriptions in the notes after the enumeration.
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*/
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typedef enum {
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/*----------------------------------------------------------------------
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name args description
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------------------------------------------------------------------------*/
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OP_MOVE,/* A B R[A] := R[B] */
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OP_LOADI,/* A sBx R[A] := sBx */
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OP_LOADF,/* A sBx R[A] := (lua_Number)sBx */
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OP_LOADK,/* A Bx R[A] := K[Bx] */
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OP_LOADKX,/* A R[A] := K[extra arg] */
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OP_LOADFALSE,/* A R[A] := false */
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OP_LFALSESKIP,/*A R[A] := false; pc++ (*) */
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OP_LOADTRUE,/* A R[A] := true */
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OP_LOADNIL,/* A B R[A], R[A+1], ..., R[A+B] := nil */
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OP_GETUPVAL,/* A B R[A] := UpValue[B] */
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OP_SETUPVAL,/* A B UpValue[B] := R[A] */
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OP_GETTABUP,/* A B C R[A] := UpValue[B][K[C]:string] */
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OP_GETTABLE,/* A B C R[A] := R[B][R[C]] */
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OP_GETI,/* A B C R[A] := R[B][C] */
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OP_GETFIELD,/* A B C R[A] := R[B][K[C]:string] */
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OP_SETTABUP,/* A B C UpValue[A][K[B]:string] := RK(C) */
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OP_SETTABLE,/* A B C R[A][R[B]] := RK(C) */
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OP_SETI,/* A B C R[A][B] := RK(C) */
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OP_SETFIELD,/* A B C R[A][K[B]:string] := RK(C) */
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OP_NEWTABLE,/* A B C k R[A] := {} */
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OP_SELF,/* A B C R[A+1] := R[B]; R[A] := R[B][RK(C):string] */
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OP_ADDI,/* A B sC R[A] := R[B] + sC */
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OP_ADDK,/* A B C R[A] := R[B] + K[C]:number */
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OP_SUBK,/* A B C R[A] := R[B] - K[C]:number */
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OP_MULK,/* A B C R[A] := R[B] * K[C]:number */
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OP_MODK,/* A B C R[A] := R[B] % K[C]:number */
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OP_POWK,/* A B C R[A] := R[B] ^ K[C]:number */
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OP_DIVK,/* A B C R[A] := R[B] / K[C]:number */
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OP_IDIVK,/* A B C R[A] := R[B] // K[C]:number */
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OP_BANDK,/* A B C R[A] := R[B] & K[C]:integer */
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OP_BORK,/* A B C R[A] := R[B] | K[C]:integer */
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OP_BXORK,/* A B C R[A] := R[B] ~ K[C]:integer */
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OP_SHRI,/* A B sC R[A] := R[B] >> sC */
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OP_SHLI,/* A B sC R[A] := sC << R[B] */
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OP_ADD,/* A B C R[A] := R[B] + R[C] */
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OP_SUB,/* A B C R[A] := R[B] - R[C] */
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OP_MUL,/* A B C R[A] := R[B] * R[C] */
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OP_MOD,/* A B C R[A] := R[B] % R[C] */
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OP_POW,/* A B C R[A] := R[B] ^ R[C] */
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OP_DIV,/* A B C R[A] := R[B] / R[C] */
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OP_IDIV,/* A B C R[A] := R[B] // R[C] */
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OP_BAND,/* A B C R[A] := R[B] & R[C] */
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OP_BOR,/* A B C R[A] := R[B] | R[C] */
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OP_BXOR,/* A B C R[A] := R[B] ~ R[C] */
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OP_SHL,/* A B C R[A] := R[B] << R[C] */
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OP_SHR,/* A B C R[A] := R[B] >> R[C] */
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OP_MMBIN,/* A B C call C metamethod over R[A] and R[B] (*) */
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OP_MMBINI,/* A sB C k call C metamethod over R[A] and sB */
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OP_MMBINK,/* A B C k call C metamethod over R[A] and K[B] */
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OP_UNM,/* A B R[A] := -R[B] */
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OP_BNOT,/* A B R[A] := ~R[B] */
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OP_NOT,/* A B R[A] := not R[B] */
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OP_LEN,/* A B R[A] := #R[B] (length operator) */
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OP_CONCAT,/* A B R[A] := R[A].. ... ..R[A + B - 1] */
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OP_CLOSE,/* A close all upvalues >= R[A] */
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OP_TBC,/* A mark variable A "to be closed" */
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OP_JMP,/* sJ pc += sJ */
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OP_EQ,/* A B k if ((R[A] == R[B]) ~= k) then pc++ */
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OP_LT,/* A B k if ((R[A] < R[B]) ~= k) then pc++ */
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OP_LE,/* A B k if ((R[A] <= R[B]) ~= k) then pc++ */
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OP_EQK,/* A B k if ((R[A] == K[B]) ~= k) then pc++ */
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OP_EQI,/* A sB k if ((R[A] == sB) ~= k) then pc++ */
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OP_LTI,/* A sB k if ((R[A] < sB) ~= k) then pc++ */
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OP_LEI,/* A sB k if ((R[A] <= sB) ~= k) then pc++ */
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OP_GTI,/* A sB k if ((R[A] > sB) ~= k) then pc++ */
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OP_GEI,/* A sB k if ((R[A] >= sB) ~= k) then pc++ */
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OP_TEST,/* A k if (not R[A] == k) then pc++ */
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OP_TESTSET,/* A B k if (not R[B] == k) then pc++ else R[A] := R[B] (*) */
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OP_CALL,/* A B C R[A], ... ,R[A+C-2] := R[A](R[A+1], ... ,R[A+B-1]) */
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OP_TAILCALL,/* A B C k return R[A](R[A+1], ... ,R[A+B-1]) */
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OP_RETURN,/* A B C k return R[A], ... ,R[A+B-2] (see note) */
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OP_RETURN0,/* return */
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OP_RETURN1,/* A return R[A] */
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OP_FORLOOP,/* A Bx update counters; if loop continues then pc-=Bx; */
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OP_FORPREP,/* A Bx <check values and prepare counters>;
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if not to run then pc+=Bx+1; */
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OP_TFORPREP,/* A Bx create upvalue for R[A + 3]; pc+=Bx */
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OP_TFORCALL,/* A C R[A+4], ... ,R[A+3+C] := R[A](R[A+1], R[A+2]); */
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OP_TFORLOOP,/* A Bx if R[A+2] ~= nil then { R[A]=R[A+2]; pc -= Bx } */
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OP_SETLIST,/* A B C k R[A][C+i] := R[A+i], 1 <= i <= B */
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OP_CLOSURE,/* A Bx R[A] := closure(KPROTO[Bx]) */
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OP_VARARG,/* A C R[A], R[A+1], ..., R[A+C-2] = vararg */
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OP_VARARGPREP,/*A (adjust vararg parameters) */
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OP_EXTRAARG/* Ax extra (larger) argument for previous opcode */
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} OpCode;
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#define NUM_OPCODES ((int)(OP_EXTRAARG) + 1)
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/*===========================================================================
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Notes:
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(*) Opcode OP_LFALSESKIP is used to convert a condition to a boolean
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value, in a code equivalent to (not cond ? false : true). (It
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produces false and skips the next instruction producing true.)
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(*) Opcodes OP_MMBIN and variants follow each arithmetic and
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bitwise opcode. If the operation succeeds, it skips this next
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opcode. Otherwise, this opcode calls the corresponding metamethod.
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(*) Opcode OP_TESTSET is used in short-circuit expressions that need
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both to jump and to produce a value, such as (a = b or c).
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(*) In OP_CALL, if (B == 0) then B = top - A. If (C == 0), then
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'top' is set to last_result+1, so next open instruction (OP_CALL,
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OP_RETURN*, OP_SETLIST) may use 'top'.
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(*) In OP_VARARG, if (C == 0) then use actual number of varargs and
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set top (like in OP_CALL with C == 0).
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(*) In OP_RETURN, if (B == 0) then return up to 'top'.
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(*) In OP_LOADKX and OP_NEWTABLE, the next instruction is always
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OP_EXTRAARG.
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(*) In OP_SETLIST, if (B == 0) then real B = 'top'; if k, then
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real C = EXTRAARG _ C (the bits of EXTRAARG concatenated with the
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bits of C).
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(*) In OP_NEWTABLE, B is log2 of the hash size (which is always a
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power of 2) plus 1, or zero for size zero. If not k, the array size
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is C. Otherwise, the array size is EXTRAARG _ C.
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(*) For comparisons, k specifies what condition the test should accept
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(true or false).
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(*) In OP_MMBINI/OP_MMBINK, k means the arguments were flipped
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(the constant is the first operand).
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(*) All 'skips' (pc++) assume that next instruction is a jump.
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(*) In instructions OP_RETURN/OP_TAILCALL, 'k' specifies that the
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function builds upvalues, which may need to be closed. C > 0 means
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the function is vararg, so that its 'func' must be corrected before
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returning; in this case, (C - 1) is its number of fixed parameters.
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(*) In comparisons with an immediate operand, C signals whether the
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original operand was a float. (It must be corrected in case of
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metamethods.)
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===========================================================================*/
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/*
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** masks for instruction properties. The format is:
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** bits 0-2: op mode
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** bit 3: instruction set register A
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** bit 4: operator is a test (next instruction must be a jump)
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** bit 5: instruction uses 'L->top' set by previous instruction (when B == 0)
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** bit 6: instruction sets 'L->top' for next instruction (when C == 0)
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** bit 7: instruction is an MM instruction (call a metamethod)
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*/
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LUAI_DDEC(const lu_byte luaP_opmodes[NUM_OPCODES];)
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#define getOpMode(m) (cast(enum OpMode, luaP_opmodes[m] & 7))
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#define testAMode(m) (luaP_opmodes[m] & (1 << 3))
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#define testTMode(m) (luaP_opmodes[m] & (1 << 4))
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#define testITMode(m) (luaP_opmodes[m] & (1 << 5))
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#define testOTMode(m) (luaP_opmodes[m] & (1 << 6))
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#define testMMMode(m) (luaP_opmodes[m] & (1 << 7))
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/* "out top" (set top for next instruction) */
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#define isOT(i) \
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((testOTMode(GET_OPCODE(i)) && GETARG_C(i) == 0) || \
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GET_OPCODE(i) == OP_TAILCALL)
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/* "in top" (uses top from previous instruction) */
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#define isIT(i) (testITMode(GET_OPCODE(i)) && GETARG_B(i) == 0)
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#define opmode(mm,ot,it,t,a,m) \
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(((mm) << 7) | ((ot) << 6) | ((it) << 5) | ((t) << 4) | ((a) << 3) | (m))
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/* number of list items to accumulate before a SETLIST instruction */
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#define LFIELDS_PER_FLUSH 50
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#endif
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