mirror of
https://github.com/lua/lua
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232 lines
6.8 KiB
C
232 lines
6.8 KiB
C
/*
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** $Id: lopcodes.h,v 1.90 2002/03/08 19:10:32 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 numbers.
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All instructions have an opcode in the first 6 bits.
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Instructions can have the following fields:
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`A' : 8 bits (25-32)
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`B' : 8 bits (17-24)
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`C' : 10 bits (7-16)
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`Bc' : 18 bits (`B' and `C' together)
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`sBc' : signed Bc
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A signed argument is represented in excess K; that is, the number
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value is the unsigned value minus K. K is exactly the maximum value
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for that argument (so that -max is represented by 0, and +max is
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represented by 2*max), which is half the maximum for the corresponding
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unsigned argument.
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===========================================================================*/
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enum OpMode {iABC, iABc, iAsBc}; /* basic instruction format */
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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 10
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#define SIZE_B 8
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#define SIZE_Bc (SIZE_C + SIZE_B)
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#define SIZE_A 8
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#define SIZE_OP 6
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#define POS_C SIZE_OP
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#define POS_B (POS_C + SIZE_C)
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#define POS_Bc POS_C
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#define POS_A (POS_B + SIZE_B)
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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 BITS_INT-1 bits (-1 for sign)
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*/
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#if SIZE_Bc < BITS_INT-1
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#define MAXARG_Bc ((1<<SIZE_Bc)-1)
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#define MAXARG_sBc (MAXARG_Bc>>1) /* `sBc' is signed */
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#else
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#define MAXARG_Bc MAX_INT
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#define MAXARG_sBc MAX_INT
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#endif
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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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/* 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)&MASK1(SIZE_OP,0)))
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#define SET_OPCODE(i,o) (((i)&MASK0(SIZE_OP,0)) | cast(Instruction, o))
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#define GETARG_A(i) (cast(int, (i)>>POS_A))
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#define SETARG_A(i,u) ((i) = (((i)&MASK0(SIZE_A,POS_A)) | \
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(cast(Instruction, u)<<POS_A)))
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#define GETARG_B(i) (cast(int, ((i)>>POS_B) & MASK1(SIZE_B,0)))
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#define SETARG_B(i,b) ((i) = (((i)&MASK0(SIZE_B,POS_B)) | \
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(cast(Instruction, b)<<POS_B)))
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#define GETARG_C(i) (cast(int, ((i)>>POS_C) & MASK1(SIZE_C,0)))
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#define SETARG_C(i,b) ((i) = (((i)&MASK0(SIZE_C,POS_C)) | \
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(cast(Instruction, b)<<POS_C)))
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#define GETARG_Bc(i) (cast(int, ((i)>>POS_Bc) & MASK1(SIZE_Bc,0)))
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#define SETARG_Bc(i,b) ((i) = (((i)&MASK0(SIZE_Bc,POS_Bc)) | \
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(cast(Instruction, b)<<POS_Bc)))
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#define GETARG_sBc(i) (GETARG_Bc(i)-MAXARG_sBc)
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#define SETARG_sBc(i,b) SETARG_Bc((i),cast(unsigned int, (b)+MAXARG_sBc))
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#define CREATE_ABC(o,a,b,c) (cast(Instruction, o) \
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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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#define CREATE_ABc(o,a,bc) (cast(Instruction, o) \
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| (cast(Instruction, a)<<POS_A) \
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| (cast(Instruction, bc)<<POS_Bc))
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/*
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** invalid registers that fits in 8 bits
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*/
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#define NO_REG MAXARG_A
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#define NO_REG1 (NO_REG+1)
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/*
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** R(x) - register
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** Kst(x) - constant (in constant table)
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** R/K(x) == if x < MAXSTACK then R(x) else Kst(x-MAXSTACK)
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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_LOADK,/* A Bc R(A) := Kst(Bc) */
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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(B) := nil */
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OP_GETUPVAL,/* A B R(A) := UpValue[B] */
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OP_GETGLOBAL,/* A Bc R(A) := Gbl[Kst(Bc)] */
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OP_GETTABLE,/* A B C R(A) := R(B)[R/K(C)] */
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OP_SETGLOBAL,/* A Bc Gbl[Kst(Bc)] := R(A) */
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OP_SETUPVAL,/* A B UpValue[B] := R(A) */
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OP_SETTABLE,/* A B C R(B)[R/K(C)] := R(A) */
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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)[R/K(C)] */
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OP_ADD,/* A B C R(A) := R(B) + R/K(C) */
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OP_SUB,/* A B C R(A) := R(B) - R/K(C) */
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OP_MUL,/* A B C R(A) := R(B) * R/K(C) */
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OP_DIV,/* A B C R(A) := R(B) / R/K(C) */
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OP_POW,/* A B C R(A) := R(B) ^ R/K(C) */
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OP_UNM,/* A B R(A) := -R(B) */
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OP_NOT,/* A B R(A) := not R(B) */
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OP_CONCAT,/* A B C R(A) := R(B).. ... ..R(C) */
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OP_JMP,/* sBc PC += sBc */
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OP_TESTEQ,/* A C if not (R(A) == R/K(C)) then pc++ */
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OP_TESTNE,/* A C if not (R(A) ~= R/K(C)) then pc++ */
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OP_TESTLT,/* A C if not (R(A) < R/K(C)) then pc++ */
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OP_TESTLE,/* A C if not (R(A) <= R/K(C)) then pc++ */
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OP_TESTGT,/* A C if not (R(A) > R/K(C)) then pc++ */
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OP_TESTGE,/* A C if not (R(A) >= R/K(C)) then pc++ */
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OP_TESTT,/* A B if (R(B)) then R(A) := R(B) else pc++ */
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OP_TESTF,/* A B if not (R(B)) 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_RETURN,/* A B return R(A), ... ,R(A+B-2) (see (3)) */
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OP_FORLOOP,/* A sBc R(A)+=R(A+2); if R(A) <?= R(A+1) then PC+= sBc */
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OP_TFORLOOP,/* A C R(A+1), ... ,R(A+C) := R(A)();
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if R(A+1) ~= nil then pc++ */
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OP_SETLIST,/* A Bc R(A)[Bc-Bc%FPF+i] := R(A+i), 1 <= i <= Bc%FPF+1 */
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OP_SETLISTO,/* A Bc */
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OP_CLOSE,/* A close all variables in the stack up to (>=) R(A)*/
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OP_CLOSURE/* A Bc R(A) := closure(KPROTO[Bc], R(A), ... ,R(A+n)) */
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} OpCode;
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#define NUM_OPCODES (cast(int, OP_CLOSURE+1))
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/*===========================================================================
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Notes:
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(1) In OP_CALL, if (B == 0) then B = top. C is the number of returns - 1,
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and can be 0: OP_CALL then sets `top' to last_result+1, so
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next open instruction (OP_CALL, OP_RETURN, OP_SETLIST) may use `top'.
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(2) In OP_RETURN, if (B == 0) then return up to `top'
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===========================================================================*/
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/*
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** masks for instruction properties
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*/
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enum OpModeMask {
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OpModeBreg = 2, /* B is a register */
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OpModeCreg, /* C is a register/constant */
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OpModesetA, /* instruction set register A */
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OpModeK, /* Bc is a constant */
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OpModeT, /* operator is a test */
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OpModeNoTrace /* operator should not be traced */
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};
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extern const lu_byte luaP_opmodes[NUM_OPCODES];
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#define getOpMode(m) (cast(enum OpMode, luaP_opmodes[m] & 3))
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#define testOpMode(m, b) (luaP_opmodes[m] & (1 << (b)))
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/*
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** opcode names (only included when compiled with LUA_OPNAMES)
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*/
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extern const char *const luaP_opnames[];
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/* number of list items to accumulate before a SETLIST instruction */
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/* (must be a power of 2) */
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#define LFIELDS_PER_FLUSH 32
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#endif
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