mirror of
https://github.com/lua/lua
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369 lines
12 KiB
C
369 lines
12 KiB
C
/*
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** $Id: lopcodes.h,v 1.192 2018/06/08 19:07:27 roberto Exp roberto $
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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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iAsB sBx (signed)(17) | A(8) | Op(7) |
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iAx Ax(25) | Op(7) |
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isJ sJ(24) |m| 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 - 1)
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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_m POS_A
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#define POS_sJ (POS_A + 1)
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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 LUAI_BITSINT-1 bits (-1 for sign)
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*/
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#if SIZE_Bx < LUAI_BITSINT-1
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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 SIZE_Ax < LUAI_BITSINT-1
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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 SIZE_sJ < LUAI_BITSINT-1
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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 MAXARG_Cx ((1<<(SIZE_C + 1))-1)
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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) (GETARG_B(i) - OFFSET_sC)
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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) (GETARG_C(i) - OFFSET_sC)
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#define SETARG_C(i,v) setarg(i, v, POS_C, SIZE_C)
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#define TESTARG_k(i) (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 GETARG_m(i) check_exp(checkopm(i, isJ), getarg(i, POS_m, 1))
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#define SETARG_m(i,m) setarg(i, m, POS_m, 1)
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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
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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_LOADBOOL,/* A B C R(A) := (Bool)B; if (C) pc++ */
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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 R(A) := {} (size = B,C) */
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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) + C */
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OP_SUBI,/* A B sC R(A) := R(B) - C */
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OP_MULI,/* A B sC R(A) := R(B) * C */
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OP_MODI,/* A B sC R(A) := R(B) % C */
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OP_POWI,/* A B sC R(A) := R(B) ^ C */
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OP_DIVI,/* A B sC R(A) := R(B) / C */
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OP_IDIVI,/* A B sC R(A) := R(B) // C */
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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 C R(A) := R(B) >> C */
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OP_SHLI,/* A B C R(A) := C << 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_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) := length of R(B) */
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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_JMP,/* k sJ pc += sJ (k is used in code generation) */
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OP_EQ,/* A B if ((R(A) == R(B)) ~= k) then pc++ */
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OP_LT,/* A B if ((R(A) < R(B)) ~= k) then pc++ */
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OP_LE,/* A B if ((R(A) <= R(B)) ~= k) then pc++ */
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OP_EQK,/* A B if ((R(A) == K(B)) ~= k) then pc++ */
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OP_EQI,/* A sB if ((R(A) == sB) ~= k) then pc++ */
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OP_LTI,/* A sB if ((R(A) < sB) ~= k) then pc++ */
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OP_LEI,/* A sB if ((R(A) <= sB) ~= k) then pc++ */
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OP_GTI,/* A sB if ((R(A) > sB) ~= k) then pc++ */
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OP_GEI,/* A sB if ((R(A) >= sB) ~= k) then pc++ */
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OP_TEST,/* A if (not R(A) == k) then pc++ */
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OP_TESTSET,/* A B if (not R(B) == k) then R(A) := R(B) else pc++ */
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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 return R(A)(R(A+1), ... ,R(A+B-1)) */
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OP_RETURN,/* A B C 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_FORLOOP1,/* A Bx R(A)++;
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if R(A) <= R(A+1) then { pc-=Bx; R(A+3)=R(A) } */
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OP_FORPREP1,/* A Bx R(A)--; pc+=Bx */
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OP_FORLOOP,/* A Bx R(A)+=R(A+2);
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if R(A) <?= R(A+1) then { pc-=Bx; R(A+3)=R(A) } */
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OP_FORPREP,/* A Bx R(A)-=R(A+2); pc+=Bx */
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OP_TFORCALL,/* A C R(A+3), ... ,R(A+2+C) := R(A)(R(A+1), R(A+2)); */
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OP_TFORLOOP,/* A Bx if R(A+1) ~= nil then { R(A)=R(A+1); pc -= Bx } */
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OP_SETLIST,/* A B C R(A)[(C-1)*FPF+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_PREPVARARG,/*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 (cast_int(OP_EXTRAARG) + 1)
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/*===========================================================================
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Notes:
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(*) In OP_CALL, if (B == 0) then B = top. If (C == 0), then 'top' is
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set to last_result+1, so next open instruction (OP_CALL, OP_RETURN*,
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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_SETLIST, if (B == 0) then real B = 'top'; if (C == 0) then
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next 'instruction' is EXTRAARG(real C).
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(*) In OP_LOADKX, the next 'instruction' is always EXTRAARG.
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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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(*) 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 either builds upvalues, which may need to be closed, or is
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vararg, which must be corrected before returning. When 'k' is true,
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C > 0 means the function is vararg and (C - 1) is its number of
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fixed parameters.
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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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*/
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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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/* "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(ot,it,t,a,m) (((ot)<<6) | ((it)<<5) | ((t)<<4) | ((a)<<3) | (m))
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LUAI_DDEC(const char *const luaP_opnames[NUM_OPCODES+1];) /* opcode names */
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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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