| 1 | /* |
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| 2 | ** $Id: lopcodes.h,v 1.142.1.1 2013/04/12 18:48:47 roberto Exp $ |
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| 3 | ** Opcodes for Lua virtual machine |
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| 4 | ** See Copyright Notice in lua.h |
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| 5 | */ |
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| 6 | |
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| 7 | #ifndef lopcodes_h |
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| 8 | #define lopcodes_h |
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| 9 | |
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| 10 | #include "llimits.h" |
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| 11 | |
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| 12 | |
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| 13 | /*=========================================================================== |
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| 14 | We assume that instructions are unsigned numbers. |
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| 15 | All instructions have an opcode in the first 6 bits. |
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| 16 | Instructions can have the following fields: |
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| 17 | `A' : 8 bits |
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| 18 | `B' : 9 bits |
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| 19 | `C' : 9 bits |
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| 20 | 'Ax' : 26 bits ('A', 'B', and 'C' together) |
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| 21 | `Bx' : 18 bits (`B' and `C' together) |
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| 22 | `sBx' : signed Bx |
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| 23 | |
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| 24 | A signed argument is represented in excess K; that is, the number |
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| 25 | value is the unsigned value minus K. K is exactly the maximum value |
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| 26 | for that argument (so that -max is represented by 0, and +max is |
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| 27 | represented by 2*max), which is half the maximum for the corresponding |
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| 28 | unsigned argument. |
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| 29 | ===========================================================================*/ |
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| 30 | |
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| 31 | |
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| 32 | enum OpMode {iABC, iABx, iAsBx, iAx}; /* basic instruction format */ |
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| 33 | |
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| 34 | |
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| 35 | /* |
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| 36 | ** size and position of opcode arguments. |
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| 37 | */ |
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| 38 | #define SIZE_C 9 |
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| 39 | #define SIZE_B 9 |
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| 40 | #define SIZE_Bx (SIZE_C + SIZE_B) |
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| 41 | #define SIZE_A 8 |
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| 42 | #define SIZE_Ax (SIZE_C + SIZE_B + SIZE_A) |
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| 43 | |
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| 44 | #define SIZE_OP 6 |
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| 45 | |
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| 46 | #define POS_OP 0 |
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| 47 | #define POS_A (POS_OP + SIZE_OP) |
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| 48 | #define POS_C (POS_A + SIZE_A) |
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| 49 | #define POS_B (POS_C + SIZE_C) |
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| 50 | #define POS_Bx POS_C |
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| 51 | #define POS_Ax POS_A |
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| 52 | |
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| 53 | |
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| 54 | /* |
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| 55 | ** limits for opcode arguments. |
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| 56 | ** we use (signed) int to manipulate most arguments, |
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| 57 | ** so they must fit in LUAI_BITSINT-1 bits (-1 for sign) |
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| 58 | */ |
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| 59 | #if SIZE_Bx < LUAI_BITSINT-1 |
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| 60 | #define MAXARG_Bx ((1<<SIZE_Bx)-1) |
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| 61 | #define MAXARG_sBx (MAXARG_Bx>>1) /* `sBx' is signed */ |
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| 62 | #else |
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| 63 | #define MAXARG_Bx MAX_INT |
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| 64 | #define MAXARG_sBx MAX_INT |
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| 65 | #endif |
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| 66 | |
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| 67 | #if SIZE_Ax < LUAI_BITSINT-1 |
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| 68 | #define MAXARG_Ax ((1<<SIZE_Ax)-1) |
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| 69 | #else |
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| 70 | #define MAXARG_Ax MAX_INT |
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| 71 | #endif |
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| 72 | |
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| 73 | |
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| 74 | #define MAXARG_A ((1<<SIZE_A)-1) |
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| 75 | #define MAXARG_B ((1<<SIZE_B)-1) |
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| 76 | #define MAXARG_C ((1<<SIZE_C)-1) |
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| 77 | |
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| 78 | |
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| 79 | /* creates a mask with `n' 1 bits at position `p' */ |
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| 80 | #define MASK1(n,p) ((~((~(Instruction)0)<<(n)))<<(p)) |
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| 81 | |
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| 82 | /* creates a mask with `n' 0 bits at position `p' */ |
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| 83 | #define MASK0(n,p) (~MASK1(n,p)) |
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| 84 | |
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| 85 | /* |
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| 86 | ** the following macros help to manipulate instructions |
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| 87 | */ |
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| 88 | |
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| 89 | #define GET_OPCODE(i) (cast(OpCode, ((i)>>POS_OP) & MASK1(SIZE_OP,0))) |
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| 90 | #define SET_OPCODE(i,o) ((i) = (((i)&MASK0(SIZE_OP,POS_OP)) | \ |
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| 91 | ((cast(Instruction, o)<<POS_OP)&MASK1(SIZE_OP,POS_OP)))) |
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| 92 | |
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| 93 | #define getarg(i,pos,size) (cast(int, ((i)>>pos) & MASK1(size,0))) |
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| 94 | #define setarg(i,v,pos,size) ((i) = (((i)&MASK0(size,pos)) | \ |
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| 95 | ((cast(Instruction, v)<<pos)&MASK1(size,pos)))) |
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| 96 | |
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| 97 | #define GETARG_A(i) getarg(i, POS_A, SIZE_A) |
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| 98 | #define SETARG_A(i,v) setarg(i, v, POS_A, SIZE_A) |
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| 99 | |
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| 100 | #define GETARG_B(i) getarg(i, POS_B, SIZE_B) |
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| 101 | #define SETARG_B(i,v) setarg(i, v, POS_B, SIZE_B) |
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| 102 | |
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| 103 | #define GETARG_C(i) getarg(i, POS_C, SIZE_C) |
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| 104 | #define SETARG_C(i,v) setarg(i, v, POS_C, SIZE_C) |
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| 105 | |
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| 106 | #define GETARG_Bx(i) getarg(i, POS_Bx, SIZE_Bx) |
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| 107 | #define SETARG_Bx(i,v) setarg(i, v, POS_Bx, SIZE_Bx) |
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| 108 | |
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| 109 | #define GETARG_Ax(i) getarg(i, POS_Ax, SIZE_Ax) |
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| 110 | #define SETARG_Ax(i,v) setarg(i, v, POS_Ax, SIZE_Ax) |
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| 111 | |
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| 112 | #define GETARG_sBx(i) (GETARG_Bx(i)-MAXARG_sBx) |
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| 113 | #define SETARG_sBx(i,b) SETARG_Bx((i),cast(unsigned int, (b)+MAXARG_sBx)) |
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| 114 | |
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| 115 | |
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| 116 | #define CREATE_ABC(o,a,b,c) ((cast(Instruction, o)<<POS_OP) \ |
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| 117 | | (cast(Instruction, a)<<POS_A) \ |
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| 118 | | (cast(Instruction, b)<<POS_B) \ |
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| 119 | | (cast(Instruction, c)<<POS_C)) |
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| 120 | |
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| 121 | #define CREATE_ABx(o,a,bc) ((cast(Instruction, o)<<POS_OP) \ |
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| 122 | | (cast(Instruction, a)<<POS_A) \ |
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| 123 | | (cast(Instruction, bc)<<POS_Bx)) |
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| 124 | |
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| 125 | #define CREATE_Ax(o,a) ((cast(Instruction, o)<<POS_OP) \ |
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| 126 | | (cast(Instruction, a)<<POS_Ax)) |
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| 127 | |
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| 128 | |
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| 129 | /* |
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| 130 | ** Macros to operate RK indices |
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| 131 | */ |
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| 132 | |
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| 133 | /* this bit 1 means constant (0 means register) */ |
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| 134 | #define BITRK (1 << (SIZE_B - 1)) |
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| 135 | |
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| 136 | /* test whether value is a constant */ |
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| 137 | #define ISK(x) ((x) & BITRK) |
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| 138 | |
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| 139 | /* gets the index of the constant */ |
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| 140 | #define INDEXK(r) ((int)(r) & ~BITRK) |
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| 141 | |
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| 142 | #define MAXINDEXRK (BITRK - 1) |
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| 143 | |
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| 144 | /* code a constant index as a RK value */ |
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| 145 | #define RKASK(x) ((x) | BITRK) |
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| 146 | |
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| 147 | |
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| 148 | /* |
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| 149 | ** invalid register that fits in 8 bits |
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| 150 | */ |
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| 151 | #define NO_REG MAXARG_A |
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| 152 | |
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| 153 | |
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| 154 | /* |
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| 155 | ** R(x) - register |
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| 156 | ** Kst(x) - constant (in constant table) |
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| 157 | ** RK(x) == if ISK(x) then Kst(INDEXK(x)) else R(x) |
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| 158 | */ |
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| 159 | |
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| 160 | |
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| 161 | /* |
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| 162 | ** grep "ORDER OP" if you change these enums |
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| 163 | */ |
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| 164 | |
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| 165 | typedef enum { |
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| 166 | /*---------------------------------------------------------------------- |
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| 167 | name args description |
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| 168 | ------------------------------------------------------------------------*/ |
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| 169 | OP_MOVE,/* A B R(A) := R(B) */ |
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| 170 | OP_LOADK,/* A Bx R(A) := Kst(Bx) */ |
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| 171 | OP_LOADKX,/* A R(A) := Kst(extra arg) */ |
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| 172 | OP_LOADBOOL,/* A B C R(A) := (Bool)B; if (C) pc++ */ |
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| 173 | OP_LOADNIL,/* A B R(A), R(A+1), ..., R(A+B) := nil */ |
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| 174 | OP_GETUPVAL,/* A B R(A) := UpValue[B] */ |
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| 175 | |
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| 176 | OP_GETTABUP,/* A B C R(A) := UpValue[B][RK(C)] */ |
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| 177 | OP_GETTABLE,/* A B C R(A) := R(B)[RK(C)] */ |
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| 178 | |
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| 179 | OP_SETTABUP,/* A B C UpValue[A][RK(B)] := RK(C) */ |
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| 180 | OP_SETUPVAL,/* A B UpValue[B] := R(A) */ |
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| 181 | OP_SETTABLE,/* A B C R(A)[RK(B)] := RK(C) */ |
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| 182 | |
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| 183 | OP_NEWTABLE,/* A B C R(A) := {} (size = B,C) */ |
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| 184 | |
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| 185 | OP_SELF,/* A B C R(A+1) := R(B); R(A) := R(B)[RK(C)] */ |
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| 186 | |
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| 187 | OP_ADD,/* A B C R(A) := RK(B) + RK(C) */ |
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| 188 | OP_SUB,/* A B C R(A) := RK(B) - RK(C) */ |
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| 189 | OP_MUL,/* A B C R(A) := RK(B) * RK(C) */ |
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| 190 | OP_DIV,/* A B C R(A) := RK(B) / RK(C) */ |
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| 191 | OP_MOD,/* A B C R(A) := RK(B) % RK(C) */ |
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| 192 | OP_POW,/* A B C R(A) := RK(B) ^ RK(C) */ |
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| 193 | OP_UNM,/* A B R(A) := -R(B) */ |
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| 194 | OP_NOT,/* A B R(A) := not R(B) */ |
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| 195 | OP_LEN,/* A B R(A) := length of R(B) */ |
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| 196 | |
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| 197 | OP_CONCAT,/* A B C R(A) := R(B).. ... ..R(C) */ |
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| 198 | |
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| 199 | OP_JMP,/* A sBx pc+=sBx; if (A) close all upvalues >= R(A) + 1 */ |
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| 200 | OP_EQ,/* A B C if ((RK(B) == RK(C)) ~= A) then pc++ */ |
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| 201 | OP_LT,/* A B C if ((RK(B) < RK(C)) ~= A) then pc++ */ |
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| 202 | OP_LE,/* A B C if ((RK(B) <= RK(C)) ~= A) then pc++ */ |
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| 203 | |
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| 204 | OP_TEST,/* A C if not (R(A) <=> C) then pc++ */ |
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| 205 | OP_TESTSET,/* A B C if (R(B) <=> C) then R(A) := R(B) else pc++ */ |
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| 206 | |
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| 207 | OP_CALL,/* A B C R(A), ... ,R(A+C-2) := R(A)(R(A+1), ... ,R(A+B-1)) */ |
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| 208 | OP_TAILCALL,/* A B C return R(A)(R(A+1), ... ,R(A+B-1)) */ |
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| 209 | OP_RETURN,/* A B return R(A), ... ,R(A+B-2) (see note) */ |
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| 210 | |
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| 211 | OP_FORLOOP,/* A sBx R(A)+=R(A+2); |
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| 212 | if R(A) <?= R(A+1) then { pc+=sBx; R(A+3)=R(A) }*/ |
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| 213 | OP_FORPREP,/* A sBx R(A)-=R(A+2); pc+=sBx */ |
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| 214 | |
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| 215 | OP_TFORCALL,/* A C R(A+3), ... ,R(A+2+C) := R(A)(R(A+1), R(A+2)); */ |
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| 216 | OP_TFORLOOP,/* A sBx if R(A+1) ~= nil then { R(A)=R(A+1); pc += sBx }*/ |
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| 217 | |
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| 218 | OP_SETLIST,/* A B C R(A)[(C-1)*FPF+i] := R(A+i), 1 <= i <= B */ |
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| 219 | |
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| 220 | OP_CLOSURE,/* A Bx R(A) := closure(KPROTO[Bx]) */ |
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| 221 | |
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| 222 | OP_VARARG,/* A B R(A), R(A+1), ..., R(A+B-2) = vararg */ |
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| 223 | |
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| 224 | OP_EXTRAARG/* Ax extra (larger) argument for previous opcode */ |
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| 225 | } OpCode; |
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| 226 | |
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| 227 | |
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| 228 | #define NUM_OPCODES (cast(int, OP_EXTRAARG) + 1) |
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| 229 | |
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| 230 | |
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| 231 | |
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| 232 | /*=========================================================================== |
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| 233 | Notes: |
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| 234 | (*) In OP_CALL, if (B == 0) then B = top. If (C == 0), then `top' is |
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| 235 | set to last_result+1, so next open instruction (OP_CALL, OP_RETURN, |
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| 236 | OP_SETLIST) may use `top'. |
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| 237 | |
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| 238 | (*) In OP_VARARG, if (B == 0) then use actual number of varargs and |
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| 239 | set top (like in OP_CALL with C == 0). |
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| 240 | |
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| 241 | (*) In OP_RETURN, if (B == 0) then return up to `top'. |
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| 242 | |
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| 243 | (*) In OP_SETLIST, if (B == 0) then B = `top'; if (C == 0) then next |
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| 244 | 'instruction' is EXTRAARG(real C). |
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| 245 | |
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| 246 | (*) In OP_LOADKX, the next 'instruction' is always EXTRAARG. |
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| 247 | |
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| 248 | (*) For comparisons, A specifies what condition the test should accept |
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| 249 | (true or false). |
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| 250 | |
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| 251 | (*) All `skips' (pc++) assume that next instruction is a jump. |
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| 252 | |
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| 253 | ===========================================================================*/ |
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| 254 | |
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| 255 | |
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| 256 | /* |
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| 257 | ** masks for instruction properties. The format is: |
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| 258 | ** bits 0-1: op mode |
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| 259 | ** bits 2-3: C arg mode |
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| 260 | ** bits 4-5: B arg mode |
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| 261 | ** bit 6: instruction set register A |
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| 262 | ** bit 7: operator is a test (next instruction must be a jump) |
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| 263 | */ |
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| 264 | |
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| 265 | enum OpArgMask { |
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| 266 | OpArgN, /* argument is not used */ |
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| 267 | OpArgU, /* argument is used */ |
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| 268 | OpArgR, /* argument is a register or a jump offset */ |
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| 269 | OpArgK /* argument is a constant or register/constant */ |
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| 270 | }; |
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| 271 | |
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| 272 | LUAI_DDEC const lu_byte luaP_opmodes[NUM_OPCODES]; |
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| 273 | |
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| 274 | #define getOpMode(m) (cast(enum OpMode, luaP_opmodes[m] & 3)) |
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| 275 | #define getBMode(m) (cast(enum OpArgMask, (luaP_opmodes[m] >> 4) & 3)) |
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| 276 | #define getCMode(m) (cast(enum OpArgMask, (luaP_opmodes[m] >> 2) & 3)) |
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| 277 | #define testAMode(m) (luaP_opmodes[m] & (1 << 6)) |
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| 278 | #define testTMode(m) (luaP_opmodes[m] & (1 << 7)) |
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| 279 | |
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| 280 | |
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| 281 | LUAI_DDEC const char *const luaP_opnames[NUM_OPCODES+1]; /* opcode names */ |
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| 282 | |
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| 283 | |
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| 284 | /* number of list items to accumulate before a SETLIST instruction */ |
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| 285 | #define LFIELDS_PER_FLUSH 50 |
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| 286 | |
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| 287 | |
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| 288 | #endif |
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