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297 lines
8.6 KiB
297 lines
8.6 KiB
/* |
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** $Id: lopcodes.h,v 1.149.1.1 2017/04/19 17:20:42 roberto Exp $ |
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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 |
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'B' : 9 bits |
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'C' : 9 bits |
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'Ax' : 26 bits ('A', 'B', and 'C' together) |
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'Bx' : 18 bits ('B' and 'C' together) |
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'sBx' : signed Bx |
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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, iABx, iAsBx, iAx}; /* 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 9 |
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#define SIZE_B 9 |
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#define SIZE_Bx (SIZE_C + SIZE_B) |
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#define SIZE_A 8 |
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#define SIZE_Ax (SIZE_C + SIZE_B + SIZE_A) |
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#define SIZE_OP 6 |
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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_C (POS_A + SIZE_A) |
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#define POS_B (POS_C + SIZE_C) |
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#define POS_Bx POS_C |
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#define POS_Ax 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 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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#define MAXARG_sBx (MAXARG_Bx>>1) /* 'sBx' is signed */ |
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#else |
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#define MAXARG_Bx MAX_INT |
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#define MAXARG_sBx MAX_INT |
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#endif |
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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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#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)>>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 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) getarg(i, POS_B, SIZE_B) |
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#define SETARG_B(i,v) setarg(i, v, POS_B, SIZE_B) |
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#define GETARG_C(i) getarg(i, POS_C, SIZE_C) |
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#define SETARG_C(i,v) setarg(i, v, POS_C, SIZE_C) |
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#define GETARG_Bx(i) 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) 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) (GETARG_Bx(i)-MAXARG_sBx) |
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#define SETARG_sBx(i,b) SETARG_Bx((i),cast(unsigned int, (b)+MAXARG_sBx)) |
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#define CREATE_ABC(o,a,b,c) ((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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#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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/* |
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** Macros to operate RK indices |
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*/ |
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/* this bit 1 means constant (0 means register) */ |
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#define BITRK (1 << (SIZE_B - 1)) |
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/* test whether value is a constant */ |
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#define ISK(x) ((x) & BITRK) |
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/* gets the index of the constant */ |
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#define INDEXK(r) ((int)(r) & ~BITRK) |
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#if !defined(MAXINDEXRK) /* (for debugging only) */ |
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#define MAXINDEXRK (BITRK - 1) |
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#endif |
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/* code a constant index as a RK value */ |
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#define RKASK(x) ((x) | BITRK) |
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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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** Kst(x) - constant (in constant table) |
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** RK(x) == if ISK(x) then Kst(INDEXK(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_LOADK,/* A Bx R(A) := Kst(Bx) */ |
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OP_LOADKX,/* A R(A) := Kst(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_GETTABUP,/* A B C R(A) := UpValue[B][RK(C)] */ |
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OP_GETTABLE,/* A B C R(A) := R(B)[RK(C)] */ |
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OP_SETTABUP,/* A B C UpValue[A][RK(B)] := RK(C) */ |
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OP_SETUPVAL,/* A B UpValue[B] := R(A) */ |
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OP_SETTABLE,/* A B C R(A)[RK(B)] := 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)] */ |
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OP_ADD,/* A B C R(A) := RK(B) + RK(C) */ |
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OP_SUB,/* A B C R(A) := RK(B) - RK(C) */ |
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OP_MUL,/* A B C R(A) := RK(B) * RK(C) */ |
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OP_MOD,/* A B C R(A) := RK(B) % RK(C) */ |
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OP_POW,/* A B C R(A) := RK(B) ^ RK(C) */ |
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OP_DIV,/* A B C R(A) := RK(B) / RK(C) */ |
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OP_IDIV,/* A B C R(A) := RK(B) // RK(C) */ |
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OP_BAND,/* A B C R(A) := RK(B) & RK(C) */ |
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OP_BOR,/* A B C R(A) := RK(B) | RK(C) */ |
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OP_BXOR,/* A B C R(A) := RK(B) ~ RK(C) */ |
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OP_SHL,/* A B C R(A) := RK(B) << RK(C) */ |
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OP_SHR,/* A B C R(A) := RK(B) >> RK(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 C R(A) := R(B).. ... ..R(C) */ |
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OP_JMP,/* A sBx pc+=sBx; if (A) close all upvalues >= R(A - 1) */ |
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OP_EQ,/* A B C if ((RK(B) == RK(C)) ~= A) then pc++ */ |
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OP_LT,/* A B C if ((RK(B) < RK(C)) ~= A) then pc++ */ |
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OP_LE,/* A B C if ((RK(B) <= RK(C)) ~= A) then pc++ */ |
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OP_TEST,/* A C if not (R(A) <=> C) then pc++ */ |
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OP_TESTSET,/* A B C if (R(B) <=> C) 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 return R(A), ... ,R(A+B-2) (see note) */ |
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OP_FORLOOP,/* A sBx R(A)+=R(A+2); |
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if R(A) <?= R(A+1) then { pc+=sBx; R(A+3)=R(A) }*/ |
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OP_FORPREP,/* A sBx R(A)-=R(A+2); pc+=sBx */ |
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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 sBx if R(A+1) ~= nil then { R(A)=R(A+1); pc += sBx }*/ |
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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 B R(A), R(A+1), ..., R(A+B-2) = vararg */ |
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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 (B == 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 B = 'top'; if (C == 0) then next |
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'instruction' is EXTRAARG(real C). |
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(*) In OP_LOADKX, the next 'instruction' is always EXTRAARG. |
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(*) For comparisons, A 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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===========================================================================*/ |
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/* |
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** masks for instruction properties. The format is: |
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** bits 0-1: op mode |
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** bits 2-3: C arg mode |
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** bits 4-5: B arg mode |
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** bit 6: instruction set register A |
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** bit 7: operator is a test (next instruction must be a jump) |
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*/ |
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enum OpArgMask { |
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OpArgN, /* argument is not used */ |
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OpArgU, /* argument is used */ |
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OpArgR, /* argument is a register or a jump offset */ |
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OpArgK /* argument is a constant or register/constant */ |
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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] & 3)) |
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#define getBMode(m) (cast(enum OpArgMask, (luaP_opmodes[m] >> 4) & 3)) |
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#define getCMode(m) (cast(enum OpArgMask, (luaP_opmodes[m] >> 2) & 3)) |
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#define testAMode(m) (luaP_opmodes[m] & (1 << 6)) |
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#define testTMode(m) (luaP_opmodes[m] & (1 << 7)) |
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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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