1 /* 2 ** $Id: lopcodes.h $ 3 ** Opcodes for Lua virtual machine 4 ** See Copyright Notice in lua.h 5 */ 6 7 #ifndef lopcodes_h 8 #define lopcodes_h 9 10 #include "llimits.h" 11 12 13 /*=========================================================================== 14 We assume that instructions are unsigned 32-bit integers. 15 All instructions have an opcode in the first 7 bits. 16 Instructions can have the following formats: 17 18 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 19 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 20 iABC C(8) | B(8) |k| A(8) | Op(7) | 21 iABx Bx(17) | A(8) | Op(7) | 22 iAsBx sBx (signed)(17) | A(8) | Op(7) | 23 iAx Ax(25) | Op(7) | 24 isJ sJ(25) | Op(7) | 25 26 A signed argument is represented in excess K: the represented value is 27 the written unsigned value minus K, where K is half the maximum for the 28 corresponding unsigned argument. 29 ===========================================================================*/ 30 31 32 enum OpMode {iABC, iABx, iAsBx, iAx, isJ}; /* basic instruction formats */ 33 34 35 /* 36 ** size and position of opcode arguments. 37 */ 38 #define SIZE_C 8 39 #define SIZE_B 8 40 #define SIZE_Bx (SIZE_C + SIZE_B + 1) 41 #define SIZE_A 8 42 #define SIZE_Ax (SIZE_Bx + SIZE_A) 43 #define SIZE_sJ (SIZE_Bx + SIZE_A) 44 45 #define SIZE_OP 7 46 47 #define POS_OP 0 48 49 #define POS_A (POS_OP + SIZE_OP) 50 #define POS_k (POS_A + SIZE_A) 51 #define POS_B (POS_k + 1) 52 #define POS_C (POS_B + SIZE_B) 53 54 #define POS_Bx POS_k 55 56 #define POS_Ax POS_A 57 58 #define POS_sJ POS_A 59 60 61 /* 62 ** limits for opcode arguments. 63 ** we use (signed) 'int' to manipulate most arguments, 64 ** so they must fit in ints. 65 */ 66 67 /* Check whether type 'int' has at least 'b' bits ('b' < 32) */ 68 #define L_INTHASBITS(b) ((UINT_MAX >> ((b) - 1)) >= 1) 69 70 71 #if L_INTHASBITS(SIZE_Bx) 72 #define MAXARG_Bx ((1<<SIZE_Bx)-1) 73 #else 74 #define MAXARG_Bx MAX_INT 75 #endif 76 77 #define OFFSET_sBx (MAXARG_Bx>>1) /* 'sBx' is signed */ 78 79 80 #if L_INTHASBITS(SIZE_Ax) 81 #define MAXARG_Ax ((1<<SIZE_Ax)-1) 82 #else 83 #define MAXARG_Ax MAX_INT 84 #endif 85 86 #if L_INTHASBITS(SIZE_sJ) 87 #define MAXARG_sJ ((1 << SIZE_sJ) - 1) 88 #else 89 #define MAXARG_sJ MAX_INT 90 #endif 91 92 #define OFFSET_sJ (MAXARG_sJ >> 1) 93 94 95 #define MAXARG_A ((1<<SIZE_A)-1) 96 #define MAXARG_B ((1<<SIZE_B)-1) 97 #define MAXARG_C ((1<<SIZE_C)-1) 98 #define OFFSET_sC (MAXARG_C >> 1) 99 100 #define int2sC(i) ((i) + OFFSET_sC) 101 #define sC2int(i) ((i) - OFFSET_sC) 102 103 104 /* creates a mask with 'n' 1 bits at position 'p' */ 105 #define MASK1(n,p) ((~((~(Instruction)0)<<(n)))<<(p)) 106 107 /* creates a mask with 'n' 0 bits at position 'p' */ 108 #define MASK0(n,p) (~MASK1(n,p)) 109 110 /* 111 ** the following macros help to manipulate instructions 112 */ 113 114 #define GET_OPCODE(i) (cast(OpCode, ((i)>>POS_OP) & MASK1(SIZE_OP,0))) 115 #define SET_OPCODE(i,o) ((i) = (((i)&MASK0(SIZE_OP,POS_OP)) | \ 116 ((cast(Instruction, o)<<POS_OP)&MASK1(SIZE_OP,POS_OP)))) 117 118 #define checkopm(i,m) (getOpMode(GET_OPCODE(i)) == m) 119 120 121 #define getarg(i,pos,size) (cast_int(((i)>>(pos)) & MASK1(size,0))) 122 #define setarg(i,v,pos,size) ((i) = (((i)&MASK0(size,pos)) | \ 123 ((cast(Instruction, v)<<pos)&MASK1(size,pos)))) 124 125 #define GETARG_A(i) getarg(i, POS_A, SIZE_A) 126 #define SETARG_A(i,v) setarg(i, v, POS_A, SIZE_A) 127 128 #define GETARG_B(i) check_exp(checkopm(i, iABC), getarg(i, POS_B, SIZE_B)) 129 #define GETARG_sB(i) sC2int(GETARG_B(i)) 130 #define SETARG_B(i,v) setarg(i, v, POS_B, SIZE_B) 131 132 #define GETARG_C(i) check_exp(checkopm(i, iABC), getarg(i, POS_C, SIZE_C)) 133 #define GETARG_sC(i) sC2int(GETARG_C(i)) 134 #define SETARG_C(i,v) setarg(i, v, POS_C, SIZE_C) 135 136 #define TESTARG_k(i) check_exp(checkopm(i, iABC), (cast_int(((i) & (1u << POS_k))))) 137 #define GETARG_k(i) check_exp(checkopm(i, iABC), getarg(i, POS_k, 1)) 138 #define SETARG_k(i,v) setarg(i, v, POS_k, 1) 139 140 #define GETARG_Bx(i) check_exp(checkopm(i, iABx), getarg(i, POS_Bx, SIZE_Bx)) 141 #define SETARG_Bx(i,v) setarg(i, v, POS_Bx, SIZE_Bx) 142 143 #define GETARG_Ax(i) check_exp(checkopm(i, iAx), getarg(i, POS_Ax, SIZE_Ax)) 144 #define SETARG_Ax(i,v) setarg(i, v, POS_Ax, SIZE_Ax) 145 146 #define GETARG_sBx(i) \ 147 check_exp(checkopm(i, iAsBx), getarg(i, POS_Bx, SIZE_Bx) - OFFSET_sBx) 148 #define SETARG_sBx(i,b) SETARG_Bx((i),cast_uint((b)+OFFSET_sBx)) 149 150 #define GETARG_sJ(i) \ 151 check_exp(checkopm(i, isJ), getarg(i, POS_sJ, SIZE_sJ) - OFFSET_sJ) 152 #define SETARG_sJ(i,j) \ 153 setarg(i, cast_uint((j)+OFFSET_sJ), POS_sJ, SIZE_sJ) 154 155 156 #define CREATE_ABCk(o,a,b,c,k) ((cast(Instruction, o)<<POS_OP) \ 157 | (cast(Instruction, a)<<POS_A) \ 158 | (cast(Instruction, b)<<POS_B) \ 159 | (cast(Instruction, c)<<POS_C) \ 160 | (cast(Instruction, k)<<POS_k)) 161 162 #define CREATE_ABx(o,a,bc) ((cast(Instruction, o)<<POS_OP) \ 163 | (cast(Instruction, a)<<POS_A) \ 164 | (cast(Instruction, bc)<<POS_Bx)) 165 166 #define CREATE_Ax(o,a) ((cast(Instruction, o)<<POS_OP) \ 167 | (cast(Instruction, a)<<POS_Ax)) 168 169 #define CREATE_sJ(o,j,k) ((cast(Instruction, o) << POS_OP) \ 170 | (cast(Instruction, j) << POS_sJ) \ 171 | (cast(Instruction, k) << POS_k)) 172 173 174 #if !defined(MAXINDEXRK) /* (for debugging only) */ 175 #define MAXINDEXRK MAXARG_B 176 #endif 177 178 179 /* 180 ** invalid register that fits in 8 bits 181 */ 182 #define NO_REG MAXARG_A 183 184 185 /* 186 ** R[x] - register 187 ** K[x] - constant (in constant table) 188 ** RK(x) == if k(i) then K[x] else R[x] 189 */ 190 191 192 /* 193 ** grep "ORDER OP" if you change these enums 194 */ 195 196 typedef enum { 197 /*---------------------------------------------------------------------- 198 name args description 199 ------------------------------------------------------------------------*/ 200 OP_MOVE,/* A B R[A] := R[B] */ 201 OP_LOADI,/* A sBx R[A] := sBx */ 202 OP_LOADF,/* A sBx R[A] := (lua_Number)sBx */ 203 OP_LOADK,/* A Bx R[A] := K[Bx] */ 204 OP_LOADKX,/* A R[A] := K[extra arg] */ 205 OP_LOADFALSE,/* A R[A] := false */ 206 OP_LFALSESKIP,/*A R[A] := false; pc++ */ 207 OP_LOADTRUE,/* A R[A] := true */ 208 OP_LOADNIL,/* A B R[A], R[A+1], ..., R[A+B] := nil */ 209 OP_GETUPVAL,/* A B R[A] := UpValue[B] */ 210 OP_SETUPVAL,/* A B UpValue[B] := R[A] */ 211 212 OP_GETTABUP,/* A B C R[A] := UpValue[B][K[C]:string] */ 213 OP_GETTABLE,/* A B C R[A] := R[B][R[C]] */ 214 OP_GETI,/* A B C R[A] := R[B][C] */ 215 OP_GETFIELD,/* A B C R[A] := R[B][K[C]:string] */ 216 217 OP_SETTABUP,/* A B C UpValue[A][K[B]:string] := RK(C) */ 218 OP_SETTABLE,/* A B C R[A][R[B]] := RK(C) */ 219 OP_SETI,/* A B C R[A][B] := RK(C) */ 220 OP_SETFIELD,/* A B C R[A][K[B]:string] := RK(C) */ 221 222 OP_NEWTABLE,/* A B C k R[A] := {} */ 223 224 OP_SELF,/* A B C R[A+1] := R[B]; R[A] := R[B][RK(C):string] */ 225 226 OP_ADDI,/* A B sC R[A] := R[B] + sC */ 227 228 OP_ADDK,/* A B C R[A] := R[B] + K[C] */ 229 OP_SUBK,/* A B C R[A] := R[B] - K[C] */ 230 OP_MULK,/* A B C R[A] := R[B] * K[C] */ 231 OP_MODK,/* A B C R[A] := R[B] % K[C] */ 232 OP_POWK,/* A B C R[A] := R[B] ^ K[C] */ 233 OP_DIVK,/* A B C R[A] := R[B] / K[C] */ 234 OP_IDIVK,/* A B C R[A] := R[B] // K[C] */ 235 236 OP_BANDK,/* A B C R[A] := R[B] & K[C]:integer */ 237 OP_BORK,/* A B C R[A] := R[B] | K[C]:integer */ 238 OP_BXORK,/* A B C R[A] := R[B] ~ K[C]:integer */ 239 240 OP_SHRI,/* A B sC R[A] := R[B] >> sC */ 241 OP_SHLI,/* A B sC R[A] := sC << R[B] */ 242 243 OP_ADD,/* A B C R[A] := R[B] + R[C] */ 244 OP_SUB,/* A B C R[A] := R[B] - R[C] */ 245 OP_MUL,/* A B C R[A] := R[B] * R[C] */ 246 OP_MOD,/* A B C R[A] := R[B] % R[C] */ 247 OP_POW,/* A B C R[A] := R[B] ^ R[C] */ 248 OP_DIV,/* A B C R[A] := R[B] / R[C] */ 249 OP_IDIV,/* A B C R[A] := R[B] // R[C] */ 250 251 OP_BAND,/* A B C R[A] := R[B] & R[C] */ 252 OP_BOR,/* A B C R[A] := R[B] | R[C] */ 253 OP_BXOR,/* A B C R[A] := R[B] ~ R[C] */ 254 OP_SHL,/* A B C R[A] := R[B] << R[C] */ 255 OP_SHR,/* A B C R[A] := R[B] >> R[C] */ 256 257 OP_MMBIN,/* A B C call C metamethod over R[A] and R[B] */ 258 OP_MMBINI,/* A sB C k call C metamethod over R[A] and sB */ 259 OP_MMBINK,/* A B C k call C metamethod over R[A] and K[B] */ 260 261 OP_UNM,/* A B R[A] := -R[B] */ 262 OP_BNOT,/* A B R[A] := ~R[B] */ 263 OP_NOT,/* A B R[A] := not R[B] */ 264 OP_LEN,/* A B R[A] := #R[B] (length operator) */ 265 266 OP_CONCAT,/* A B R[A] := R[A].. ... ..R[A + B - 1] */ 267 268 OP_CLOSE,/* A close all upvalues >= R[A] */ 269 OP_TBC,/* A mark variable A "to be closed" */ 270 OP_JMP,/* sJ pc += sJ */ 271 OP_EQ,/* A B k if ((R[A] == R[B]) ~= k) then pc++ */ 272 OP_LT,/* A B k if ((R[A] < R[B]) ~= k) then pc++ */ 273 OP_LE,/* A B k if ((R[A] <= R[B]) ~= k) then pc++ */ 274 275 OP_EQK,/* A B k if ((R[A] == K[B]) ~= k) then pc++ */ 276 OP_EQI,/* A sB k if ((R[A] == sB) ~= k) then pc++ */ 277 OP_LTI,/* A sB k if ((R[A] < sB) ~= k) then pc++ */ 278 OP_LEI,/* A sB k if ((R[A] <= sB) ~= k) then pc++ */ 279 OP_GTI,/* A sB k if ((R[A] > sB) ~= k) then pc++ */ 280 OP_GEI,/* A sB k if ((R[A] >= sB) ~= k) then pc++ */ 281 282 OP_TEST,/* A k if (not R[A] == k) then pc++ */ 283 OP_TESTSET,/* A B k if (not R[B] == k) then pc++ else R[A] := R[B] */ 284 285 OP_CALL,/* A B C R[A], ... ,R[A+C-2] := R[A](R[A+1], ... ,R[A+B-1]) */ 286 OP_TAILCALL,/* A B C k return R[A](R[A+1], ... ,R[A+B-1]) */ 287 288 OP_RETURN,/* A B C k return R[A], ... ,R[A+B-2] (see note) */ 289 OP_RETURN0,/* return */ 290 OP_RETURN1,/* A return R[A] */ 291 292 OP_FORLOOP,/* A Bx update counters; if loop continues then pc-=Bx; */ 293 OP_FORPREP,/* A Bx <check values and prepare counters>; 294 if not to run then pc+=Bx+1; */ 295 296 OP_TFORPREP,/* A Bx create upvalue for R[A + 3]; pc+=Bx */ 297 OP_TFORCALL,/* A C R[A+4], ... ,R[A+3+C] := R[A](R[A+1], R[A+2]); */ 298 OP_TFORLOOP,/* A Bx if R[A+2] ~= nil then { R[A]=R[A+2]; pc -= Bx } */ 299 300 OP_SETLIST,/* A B C k R[A][C+i] := R[A+i], 1 <= i <= B */ 301 302 OP_CLOSURE,/* A Bx R[A] := closure(KPROTO[Bx]) */ 303 304 OP_VARARG,/* A C R[A], R[A+1], ..., R[A+C-2] = vararg */ 305 306 OP_VARARGPREP,/*A (adjust vararg parameters) */ 307 308 OP_EXTRAARG/* Ax extra (larger) argument for previous opcode */ 309 } OpCode; 310 311 312 #define NUM_OPCODES ((int)(OP_EXTRAARG) + 1) 313 314 315 316 /*=========================================================================== 317 Notes: 318 (*) In OP_CALL, if (B == 0) then B = top - A. If (C == 0), then 319 'top' is set to last_result+1, so next open instruction (OP_CALL, 320 OP_RETURN*, OP_SETLIST) may use 'top'. 321 322 (*) In OP_VARARG, if (C == 0) then use actual number of varargs and 323 set top (like in OP_CALL with C == 0). 324 325 (*) In OP_RETURN, if (B == 0) then return up to 'top'. 326 327 (*) In OP_LOADKX and OP_NEWTABLE, the next instruction is always 328 OP_EXTRAARG. 329 330 (*) In OP_SETLIST, if (B == 0) then real B = 'top'; if k, then 331 real C = EXTRAARG _ C (the bits of EXTRAARG concatenated with the 332 bits of C). 333 334 (*) In OP_NEWTABLE, B is log2 of the hash size (which is always a 335 power of 2) plus 1, or zero for size zero. If not k, the array size 336 is C. Otherwise, the array size is EXTRAARG _ C. 337 338 (*) For comparisons, k specifies what condition the test should accept 339 (true or false). 340 341 (*) In OP_MMBINI/OP_MMBINK, k means the arguments were flipped 342 (the constant is the first operand). 343 344 (*) All 'skips' (pc++) assume that next instruction is a jump. 345 346 (*) In instructions OP_RETURN/OP_TAILCALL, 'k' specifies that the 347 function builds upvalues, which may need to be closed. C > 0 means 348 the function is vararg, so that its 'func' must be corrected before 349 returning; in this case, (C - 1) is its number of fixed parameters. 350 351 (*) In comparisons with an immediate operand, C signals whether the 352 original operand was a float. (It must be corrected in case of 353 metamethods.) 354 355 ===========================================================================*/ 356 357 358 /* 359 ** masks for instruction properties. The format is: 360 ** bits 0-2: op mode 361 ** bit 3: instruction set register A 362 ** bit 4: operator is a test (next instruction must be a jump) 363 ** bit 5: instruction uses 'L->top' set by previous instruction (when B == 0) 364 ** bit 6: instruction sets 'L->top' for next instruction (when C == 0) 365 ** bit 7: instruction is an MM instruction (call a metamethod) 366 */ 367 368 LUAI_DDEC(const lu_byte luaP_opmodes[NUM_OPCODES];) 369 370 #define getOpMode(m) (cast(enum OpMode, luaP_opmodes[m] & 7)) 371 #define testAMode(m) (luaP_opmodes[m] & (1 << 3)) 372 #define testTMode(m) (luaP_opmodes[m] & (1 << 4)) 373 #define testITMode(m) (luaP_opmodes[m] & (1 << 5)) 374 #define testOTMode(m) (luaP_opmodes[m] & (1 << 6)) 375 #define testMMMode(m) (luaP_opmodes[m] & (1 << 7)) 376 377 /* "out top" (set top for next instruction) */ 378 #define isOT(i) \ 379 ((testOTMode(GET_OPCODE(i)) && GETARG_C(i) == 0) || \ 380 GET_OPCODE(i) == OP_TAILCALL) 381 382 /* "in top" (uses top from previous instruction) */ 383 #define isIT(i) (testITMode(GET_OPCODE(i)) && GETARG_B(i) == 0) 384 385 #define opmode(mm,ot,it,t,a,m) \ 386 (((mm) << 7) | ((ot) << 6) | ((it) << 5) | ((t) << 4) | ((a) << 3) | (m)) 387 388 389 /* number of list items to accumulate before a SETLIST instruction */ 390 #define LFIELDS_PER_FLUSH 50 391 392 #endif 393