diff options
Diffstat (limited to '')
-rw-r--r-- | libraries/LuaJIT-1.1.7/src/lcode.c | 831 |
1 files changed, 831 insertions, 0 deletions
diff --git a/libraries/LuaJIT-1.1.7/src/lcode.c b/libraries/LuaJIT-1.1.7/src/lcode.c new file mode 100644 index 0000000..c13066e --- /dev/null +++ b/libraries/LuaJIT-1.1.7/src/lcode.c | |||
@@ -0,0 +1,831 @@ | |||
1 | /* | ||
2 | ** $Id: lcode.c,v 2.25.1.3 2007/12/28 15:32:23 roberto Exp $ | ||
3 | ** Code generator for Lua | ||
4 | ** See Copyright Notice in lua.h | ||
5 | */ | ||
6 | |||
7 | |||
8 | #include <stdlib.h> | ||
9 | |||
10 | #define lcode_c | ||
11 | #define LUA_CORE | ||
12 | |||
13 | #include "lua.h" | ||
14 | |||
15 | #include "lcode.h" | ||
16 | #include "ldebug.h" | ||
17 | #include "ldo.h" | ||
18 | #include "lgc.h" | ||
19 | #include "llex.h" | ||
20 | #include "lmem.h" | ||
21 | #include "lobject.h" | ||
22 | #include "lopcodes.h" | ||
23 | #include "lparser.h" | ||
24 | #include "ltable.h" | ||
25 | |||
26 | |||
27 | #define hasjumps(e) ((e)->t != (e)->f) | ||
28 | |||
29 | |||
30 | static int isnumeral(expdesc *e) { | ||
31 | return (e->k == VKNUM && e->t == NO_JUMP && e->f == NO_JUMP); | ||
32 | } | ||
33 | |||
34 | |||
35 | void luaK_nil (FuncState *fs, int from, int n) { | ||
36 | Instruction *previous; | ||
37 | if (fs->pc > fs->lasttarget) { /* no jumps to current position? */ | ||
38 | if (fs->pc == 0) { /* function start? */ | ||
39 | if (from >= fs->nactvar) | ||
40 | return; /* positions are already clean */ | ||
41 | } | ||
42 | else { | ||
43 | previous = &fs->f->code[fs->pc-1]; | ||
44 | if (GET_OPCODE(*previous) == OP_LOADNIL) { | ||
45 | int pfrom = GETARG_A(*previous); | ||
46 | int pto = GETARG_B(*previous); | ||
47 | if (pfrom <= from && from <= pto+1) { /* can connect both? */ | ||
48 | if (from+n-1 > pto) | ||
49 | SETARG_B(*previous, from+n-1); | ||
50 | return; | ||
51 | } | ||
52 | } | ||
53 | } | ||
54 | } | ||
55 | luaK_codeABC(fs, OP_LOADNIL, from, from+n-1, 0); /* else no optimization */ | ||
56 | } | ||
57 | |||
58 | |||
59 | int luaK_jump (FuncState *fs) { | ||
60 | int jpc = fs->jpc; /* save list of jumps to here */ | ||
61 | int j; | ||
62 | fs->jpc = NO_JUMP; | ||
63 | j = luaK_codeAsBx(fs, OP_JMP, 0, NO_JUMP); | ||
64 | luaK_concat(fs, &j, jpc); /* keep them on hold */ | ||
65 | return j; | ||
66 | } | ||
67 | |||
68 | |||
69 | void luaK_ret (FuncState *fs, int first, int nret) { | ||
70 | luaK_codeABC(fs, OP_RETURN, first, nret+1, 0); | ||
71 | } | ||
72 | |||
73 | |||
74 | static int condjump (FuncState *fs, OpCode op, int A, int B, int C) { | ||
75 | luaK_codeABC(fs, op, A, B, C); | ||
76 | return luaK_jump(fs); | ||
77 | } | ||
78 | |||
79 | |||
80 | static void fixjump (FuncState *fs, int pc, int dest) { | ||
81 | Instruction *jmp = &fs->f->code[pc]; | ||
82 | int offset = dest-(pc+1); | ||
83 | lua_assert(dest != NO_JUMP); | ||
84 | if (abs(offset) > MAXARG_sBx) | ||
85 | luaX_syntaxerror(fs->ls, "control structure too long"); | ||
86 | SETARG_sBx(*jmp, offset); | ||
87 | } | ||
88 | |||
89 | |||
90 | /* | ||
91 | ** returns current `pc' and marks it as a jump target (to avoid wrong | ||
92 | ** optimizations with consecutive instructions not in the same basic block). | ||
93 | */ | ||
94 | int luaK_getlabel (FuncState *fs) { | ||
95 | fs->lasttarget = fs->pc; | ||
96 | return fs->pc; | ||
97 | } | ||
98 | |||
99 | |||
100 | static int getjump (FuncState *fs, int pc) { | ||
101 | int offset = GETARG_sBx(fs->f->code[pc]); | ||
102 | if (offset == NO_JUMP) /* point to itself represents end of list */ | ||
103 | return NO_JUMP; /* end of list */ | ||
104 | else | ||
105 | return (pc+1)+offset; /* turn offset into absolute position */ | ||
106 | } | ||
107 | |||
108 | |||
109 | static Instruction *getjumpcontrol (FuncState *fs, int pc) { | ||
110 | Instruction *pi = &fs->f->code[pc]; | ||
111 | if (pc >= 1 && testTMode(GET_OPCODE(*(pi-1)))) | ||
112 | return pi-1; | ||
113 | else | ||
114 | return pi; | ||
115 | } | ||
116 | |||
117 | |||
118 | /* | ||
119 | ** check whether list has any jump that do not produce a value | ||
120 | ** (or produce an inverted value) | ||
121 | */ | ||
122 | static int need_value (FuncState *fs, int list) { | ||
123 | for (; list != NO_JUMP; list = getjump(fs, list)) { | ||
124 | Instruction i = *getjumpcontrol(fs, list); | ||
125 | if (GET_OPCODE(i) != OP_TESTSET) return 1; | ||
126 | } | ||
127 | return 0; /* not found */ | ||
128 | } | ||
129 | |||
130 | |||
131 | static int patchtestreg (FuncState *fs, int node, int reg) { | ||
132 | Instruction *i = getjumpcontrol(fs, node); | ||
133 | if (GET_OPCODE(*i) != OP_TESTSET) | ||
134 | return 0; /* cannot patch other instructions */ | ||
135 | if (reg != NO_REG && reg != GETARG_B(*i)) | ||
136 | SETARG_A(*i, reg); | ||
137 | else /* no register to put value or register already has the value */ | ||
138 | *i = CREATE_ABC(OP_TEST, GETARG_B(*i), 0, GETARG_C(*i)); | ||
139 | |||
140 | return 1; | ||
141 | } | ||
142 | |||
143 | |||
144 | static void removevalues (FuncState *fs, int list) { | ||
145 | for (; list != NO_JUMP; list = getjump(fs, list)) | ||
146 | patchtestreg(fs, list, NO_REG); | ||
147 | } | ||
148 | |||
149 | |||
150 | static void patchlistaux (FuncState *fs, int list, int vtarget, int reg, | ||
151 | int dtarget) { | ||
152 | while (list != NO_JUMP) { | ||
153 | int next = getjump(fs, list); | ||
154 | if (patchtestreg(fs, list, reg)) | ||
155 | fixjump(fs, list, vtarget); | ||
156 | else | ||
157 | fixjump(fs, list, dtarget); /* jump to default target */ | ||
158 | list = next; | ||
159 | } | ||
160 | } | ||
161 | |||
162 | |||
163 | static void dischargejpc (FuncState *fs) { | ||
164 | patchlistaux(fs, fs->jpc, fs->pc, NO_REG, fs->pc); | ||
165 | fs->jpc = NO_JUMP; | ||
166 | } | ||
167 | |||
168 | |||
169 | void luaK_patchlist (FuncState *fs, int list, int target) { | ||
170 | if (target == fs->pc) | ||
171 | luaK_patchtohere(fs, list); | ||
172 | else { | ||
173 | lua_assert(target < fs->pc); | ||
174 | patchlistaux(fs, list, target, NO_REG, target); | ||
175 | } | ||
176 | } | ||
177 | |||
178 | |||
179 | void luaK_patchtohere (FuncState *fs, int list) { | ||
180 | luaK_getlabel(fs); | ||
181 | luaK_concat(fs, &fs->jpc, list); | ||
182 | } | ||
183 | |||
184 | |||
185 | void luaK_concat (FuncState *fs, int *l1, int l2) { | ||
186 | if (l2 == NO_JUMP) return; | ||
187 | else if (*l1 == NO_JUMP) | ||
188 | *l1 = l2; | ||
189 | else { | ||
190 | int list = *l1; | ||
191 | int next; | ||
192 | while ((next = getjump(fs, list)) != NO_JUMP) /* find last element */ | ||
193 | list = next; | ||
194 | fixjump(fs, list, l2); | ||
195 | } | ||
196 | } | ||
197 | |||
198 | |||
199 | void luaK_checkstack (FuncState *fs, int n) { | ||
200 | int newstack = fs->freereg + n; | ||
201 | if (newstack > fs->f->maxstacksize) { | ||
202 | if (newstack >= MAXSTACK) | ||
203 | luaX_syntaxerror(fs->ls, "function or expression too complex"); | ||
204 | fs->f->maxstacksize = cast_byte(newstack); | ||
205 | } | ||
206 | } | ||
207 | |||
208 | |||
209 | void luaK_reserveregs (FuncState *fs, int n) { | ||
210 | luaK_checkstack(fs, n); | ||
211 | fs->freereg += n; | ||
212 | } | ||
213 | |||
214 | |||
215 | static void freereg (FuncState *fs, int reg) { | ||
216 | if (!ISK(reg) && reg >= fs->nactvar) { | ||
217 | fs->freereg--; | ||
218 | lua_assert(reg == fs->freereg); | ||
219 | } | ||
220 | } | ||
221 | |||
222 | |||
223 | static void freeexp (FuncState *fs, expdesc *e) { | ||
224 | if (e->k == VNONRELOC) | ||
225 | freereg(fs, e->u.s.info); | ||
226 | } | ||
227 | |||
228 | |||
229 | static int addk (FuncState *fs, TValue *k, TValue *v) { | ||
230 | lua_State *L = fs->L; | ||
231 | TValue *idx = luaH_set(L, fs->h, k); | ||
232 | Proto *f = fs->f; | ||
233 | int oldsize = f->sizek; | ||
234 | if (ttisnumber(idx)) { | ||
235 | lua_assert(luaO_rawequalObj(&fs->f->k[cast_int(nvalue(idx))], v)); | ||
236 | return cast_int(nvalue(idx)); | ||
237 | } | ||
238 | else { /* constant not found; create a new entry */ | ||
239 | setnvalue(idx, cast_num(fs->nk)); | ||
240 | luaM_growvector(L, f->k, fs->nk, f->sizek, TValue, | ||
241 | MAXARG_Bx, "constant table overflow"); | ||
242 | while (oldsize < f->sizek) setnilvalue(&f->k[oldsize++]); | ||
243 | setobj(L, &f->k[fs->nk], v); | ||
244 | luaC_barrier(L, f, v); | ||
245 | return fs->nk++; | ||
246 | } | ||
247 | } | ||
248 | |||
249 | |||
250 | int luaK_stringK (FuncState *fs, TString *s) { | ||
251 | TValue o; | ||
252 | setsvalue(fs->L, &o, s); | ||
253 | return addk(fs, &o, &o); | ||
254 | } | ||
255 | |||
256 | |||
257 | int luaK_numberK (FuncState *fs, lua_Number r) { | ||
258 | TValue o; | ||
259 | setnvalue(&o, r); | ||
260 | return addk(fs, &o, &o); | ||
261 | } | ||
262 | |||
263 | |||
264 | static int boolK (FuncState *fs, int b) { | ||
265 | TValue o; | ||
266 | setbvalue(&o, b); | ||
267 | return addk(fs, &o, &o); | ||
268 | } | ||
269 | |||
270 | |||
271 | static int nilK (FuncState *fs) { | ||
272 | TValue k, v; | ||
273 | setnilvalue(&v); | ||
274 | /* cannot use nil as key; instead use table itself to represent nil */ | ||
275 | sethvalue(fs->L, &k, fs->h); | ||
276 | return addk(fs, &k, &v); | ||
277 | } | ||
278 | |||
279 | |||
280 | void luaK_setreturns (FuncState *fs, expdesc *e, int nresults) { | ||
281 | if (e->k == VCALL) { /* expression is an open function call? */ | ||
282 | SETARG_C(getcode(fs, e), nresults+1); | ||
283 | } | ||
284 | else if (e->k == VVARARG) { | ||
285 | SETARG_B(getcode(fs, e), nresults+1); | ||
286 | SETARG_A(getcode(fs, e), fs->freereg); | ||
287 | luaK_reserveregs(fs, 1); | ||
288 | } | ||
289 | } | ||
290 | |||
291 | |||
292 | void luaK_setoneret (FuncState *fs, expdesc *e) { | ||
293 | if (e->k == VCALL) { /* expression is an open function call? */ | ||
294 | e->k = VNONRELOC; | ||
295 | e->u.s.info = GETARG_A(getcode(fs, e)); | ||
296 | } | ||
297 | else if (e->k == VVARARG) { | ||
298 | SETARG_B(getcode(fs, e), 2); | ||
299 | e->k = VRELOCABLE; /* can relocate its simple result */ | ||
300 | } | ||
301 | } | ||
302 | |||
303 | |||
304 | void luaK_dischargevars (FuncState *fs, expdesc *e) { | ||
305 | switch (e->k) { | ||
306 | case VLOCAL: { | ||
307 | e->k = VNONRELOC; | ||
308 | break; | ||
309 | } | ||
310 | case VUPVAL: { | ||
311 | e->u.s.info = luaK_codeABC(fs, OP_GETUPVAL, 0, e->u.s.info, 0); | ||
312 | e->k = VRELOCABLE; | ||
313 | break; | ||
314 | } | ||
315 | case VGLOBAL: { | ||
316 | e->u.s.info = luaK_codeABx(fs, OP_GETGLOBAL, 0, e->u.s.info); | ||
317 | e->k = VRELOCABLE; | ||
318 | break; | ||
319 | } | ||
320 | case VINDEXED: { | ||
321 | freereg(fs, e->u.s.aux); | ||
322 | freereg(fs, e->u.s.info); | ||
323 | e->u.s.info = luaK_codeABC(fs, OP_GETTABLE, 0, e->u.s.info, e->u.s.aux); | ||
324 | e->k = VRELOCABLE; | ||
325 | break; | ||
326 | } | ||
327 | case VVARARG: | ||
328 | case VCALL: { | ||
329 | luaK_setoneret(fs, e); | ||
330 | break; | ||
331 | } | ||
332 | default: break; /* there is one value available (somewhere) */ | ||
333 | } | ||
334 | } | ||
335 | |||
336 | |||
337 | static int code_label (FuncState *fs, int A, int b, int jump) { | ||
338 | luaK_getlabel(fs); /* those instructions may be jump targets */ | ||
339 | return luaK_codeABC(fs, OP_LOADBOOL, A, b, jump); | ||
340 | } | ||
341 | |||
342 | |||
343 | static void discharge2reg (FuncState *fs, expdesc *e, int reg) { | ||
344 | luaK_dischargevars(fs, e); | ||
345 | switch (e->k) { | ||
346 | case VNIL: { | ||
347 | luaK_nil(fs, reg, 1); | ||
348 | break; | ||
349 | } | ||
350 | case VFALSE: case VTRUE: { | ||
351 | luaK_codeABC(fs, OP_LOADBOOL, reg, e->k == VTRUE, 0); | ||
352 | break; | ||
353 | } | ||
354 | case VK: { | ||
355 | luaK_codeABx(fs, OP_LOADK, reg, e->u.s.info); | ||
356 | break; | ||
357 | } | ||
358 | case VKNUM: { | ||
359 | luaK_codeABx(fs, OP_LOADK, reg, luaK_numberK(fs, e->u.nval)); | ||
360 | break; | ||
361 | } | ||
362 | case VRELOCABLE: { | ||
363 | Instruction *pc = &getcode(fs, e); | ||
364 | SETARG_A(*pc, reg); | ||
365 | break; | ||
366 | } | ||
367 | case VNONRELOC: { | ||
368 | if (reg != e->u.s.info) | ||
369 | luaK_codeABC(fs, OP_MOVE, reg, e->u.s.info, 0); | ||
370 | break; | ||
371 | } | ||
372 | default: { | ||
373 | lua_assert(e->k == VVOID || e->k == VJMP); | ||
374 | return; /* nothing to do... */ | ||
375 | } | ||
376 | } | ||
377 | e->u.s.info = reg; | ||
378 | e->k = VNONRELOC; | ||
379 | } | ||
380 | |||
381 | |||
382 | static void discharge2anyreg (FuncState *fs, expdesc *e) { | ||
383 | if (e->k != VNONRELOC) { | ||
384 | luaK_reserveregs(fs, 1); | ||
385 | discharge2reg(fs, e, fs->freereg-1); | ||
386 | } | ||
387 | } | ||
388 | |||
389 | |||
390 | static void exp2reg (FuncState *fs, expdesc *e, int reg) { | ||
391 | discharge2reg(fs, e, reg); | ||
392 | if (e->k == VJMP) | ||
393 | luaK_concat(fs, &e->t, e->u.s.info); /* put this jump in `t' list */ | ||
394 | if (hasjumps(e)) { | ||
395 | int final; /* position after whole expression */ | ||
396 | int p_f = NO_JUMP; /* position of an eventual LOAD false */ | ||
397 | int p_t = NO_JUMP; /* position of an eventual LOAD true */ | ||
398 | if (need_value(fs, e->t) || need_value(fs, e->f)) { | ||
399 | int fj = (e->k == VJMP) ? NO_JUMP : luaK_jump(fs); | ||
400 | p_f = code_label(fs, reg, 0, 1); | ||
401 | p_t = code_label(fs, reg, 1, 0); | ||
402 | luaK_patchtohere(fs, fj); | ||
403 | } | ||
404 | final = luaK_getlabel(fs); | ||
405 | patchlistaux(fs, e->f, final, reg, p_f); | ||
406 | patchlistaux(fs, e->t, final, reg, p_t); | ||
407 | } | ||
408 | e->f = e->t = NO_JUMP; | ||
409 | e->u.s.info = reg; | ||
410 | e->k = VNONRELOC; | ||
411 | } | ||
412 | |||
413 | |||
414 | void luaK_exp2nextreg (FuncState *fs, expdesc *e) { | ||
415 | luaK_dischargevars(fs, e); | ||
416 | freeexp(fs, e); | ||
417 | luaK_reserveregs(fs, 1); | ||
418 | exp2reg(fs, e, fs->freereg - 1); | ||
419 | } | ||
420 | |||
421 | |||
422 | int luaK_exp2anyreg (FuncState *fs, expdesc *e) { | ||
423 | luaK_dischargevars(fs, e); | ||
424 | if (e->k == VNONRELOC) { | ||
425 | if (!hasjumps(e)) return e->u.s.info; /* exp is already in a register */ | ||
426 | if (e->u.s.info >= fs->nactvar) { /* reg. is not a local? */ | ||
427 | exp2reg(fs, e, e->u.s.info); /* put value on it */ | ||
428 | return e->u.s.info; | ||
429 | } | ||
430 | } | ||
431 | luaK_exp2nextreg(fs, e); /* default */ | ||
432 | return e->u.s.info; | ||
433 | } | ||
434 | |||
435 | |||
436 | void luaK_exp2val (FuncState *fs, expdesc *e) { | ||
437 | if (hasjumps(e)) | ||
438 | luaK_exp2anyreg(fs, e); | ||
439 | else | ||
440 | luaK_dischargevars(fs, e); | ||
441 | } | ||
442 | |||
443 | |||
444 | int luaK_exp2RK (FuncState *fs, expdesc *e) { | ||
445 | luaK_exp2val(fs, e); | ||
446 | switch (e->k) { | ||
447 | case VKNUM: | ||
448 | case VTRUE: | ||
449 | case VFALSE: | ||
450 | case VNIL: { | ||
451 | if (fs->nk <= MAXINDEXRK) { /* constant fit in RK operand? */ | ||
452 | e->u.s.info = (e->k == VNIL) ? nilK(fs) : | ||
453 | (e->k == VKNUM) ? luaK_numberK(fs, e->u.nval) : | ||
454 | boolK(fs, (e->k == VTRUE)); | ||
455 | e->k = VK; | ||
456 | return RKASK(e->u.s.info); | ||
457 | } | ||
458 | else break; | ||
459 | } | ||
460 | case VK: { | ||
461 | if (e->u.s.info <= MAXINDEXRK) /* constant fit in argC? */ | ||
462 | return RKASK(e->u.s.info); | ||
463 | else break; | ||
464 | } | ||
465 | default: break; | ||
466 | } | ||
467 | /* not a constant in the right range: put it in a register */ | ||
468 | return luaK_exp2anyreg(fs, e); | ||
469 | } | ||
470 | |||
471 | |||
472 | void luaK_storevar (FuncState *fs, expdesc *var, expdesc *ex) { | ||
473 | switch (var->k) { | ||
474 | case VLOCAL: { | ||
475 | freeexp(fs, ex); | ||
476 | exp2reg(fs, ex, var->u.s.info); | ||
477 | return; | ||
478 | } | ||
479 | case VUPVAL: { | ||
480 | int e = luaK_exp2anyreg(fs, ex); | ||
481 | luaK_codeABC(fs, OP_SETUPVAL, e, var->u.s.info, 0); | ||
482 | break; | ||
483 | } | ||
484 | case VGLOBAL: { | ||
485 | int e = luaK_exp2anyreg(fs, ex); | ||
486 | luaK_codeABx(fs, OP_SETGLOBAL, e, var->u.s.info); | ||
487 | break; | ||
488 | } | ||
489 | case VINDEXED: { | ||
490 | int e = luaK_exp2RK(fs, ex); | ||
491 | luaK_codeABC(fs, OP_SETTABLE, var->u.s.info, var->u.s.aux, e); | ||
492 | break; | ||
493 | } | ||
494 | default: { | ||
495 | lua_assert(0); /* invalid var kind to store */ | ||
496 | break; | ||
497 | } | ||
498 | } | ||
499 | freeexp(fs, ex); | ||
500 | } | ||
501 | |||
502 | |||
503 | void luaK_self (FuncState *fs, expdesc *e, expdesc *key) { | ||
504 | int func; | ||
505 | luaK_exp2anyreg(fs, e); | ||
506 | freeexp(fs, e); | ||
507 | func = fs->freereg; | ||
508 | luaK_reserveregs(fs, 2); | ||
509 | luaK_codeABC(fs, OP_SELF, func, e->u.s.info, luaK_exp2RK(fs, key)); | ||
510 | freeexp(fs, key); | ||
511 | e->u.s.info = func; | ||
512 | e->k = VNONRELOC; | ||
513 | } | ||
514 | |||
515 | |||
516 | static void invertjump (FuncState *fs, expdesc *e) { | ||
517 | Instruction *pc = getjumpcontrol(fs, e->u.s.info); | ||
518 | lua_assert(testTMode(GET_OPCODE(*pc)) && GET_OPCODE(*pc) != OP_TESTSET && | ||
519 | GET_OPCODE(*pc) != OP_TEST); | ||
520 | SETARG_A(*pc, !(GETARG_A(*pc))); | ||
521 | } | ||
522 | |||
523 | |||
524 | static int jumponcond (FuncState *fs, expdesc *e, int cond) { | ||
525 | if (e->k == VRELOCABLE) { | ||
526 | Instruction ie = getcode(fs, e); | ||
527 | if (GET_OPCODE(ie) == OP_NOT) { | ||
528 | fs->pc--; /* remove previous OP_NOT */ | ||
529 | return condjump(fs, OP_TEST, GETARG_B(ie), 0, !cond); | ||
530 | } | ||
531 | /* else go through */ | ||
532 | } | ||
533 | discharge2anyreg(fs, e); | ||
534 | freeexp(fs, e); | ||
535 | return condjump(fs, OP_TESTSET, NO_REG, e->u.s.info, cond); | ||
536 | } | ||
537 | |||
538 | |||
539 | void luaK_goiftrue (FuncState *fs, expdesc *e) { | ||
540 | int pc; /* pc of last jump */ | ||
541 | luaK_dischargevars(fs, e); | ||
542 | switch (e->k) { | ||
543 | case VK: case VKNUM: case VTRUE: { | ||
544 | pc = NO_JUMP; /* always true; do nothing */ | ||
545 | break; | ||
546 | } | ||
547 | case VJMP: { | ||
548 | invertjump(fs, e); | ||
549 | pc = e->u.s.info; | ||
550 | break; | ||
551 | } | ||
552 | default: { | ||
553 | pc = jumponcond(fs, e, 0); | ||
554 | break; | ||
555 | } | ||
556 | } | ||
557 | luaK_concat(fs, &e->f, pc); /* insert last jump in `f' list */ | ||
558 | luaK_patchtohere(fs, e->t); | ||
559 | e->t = NO_JUMP; | ||
560 | } | ||
561 | |||
562 | |||
563 | static void luaK_goiffalse (FuncState *fs, expdesc *e) { | ||
564 | int pc; /* pc of last jump */ | ||
565 | luaK_dischargevars(fs, e); | ||
566 | switch (e->k) { | ||
567 | case VNIL: case VFALSE: { | ||
568 | pc = NO_JUMP; /* always false; do nothing */ | ||
569 | break; | ||
570 | } | ||
571 | case VJMP: { | ||
572 | pc = e->u.s.info; | ||
573 | break; | ||
574 | } | ||
575 | default: { | ||
576 | pc = jumponcond(fs, e, 1); | ||
577 | break; | ||
578 | } | ||
579 | } | ||
580 | luaK_concat(fs, &e->t, pc); /* insert last jump in `t' list */ | ||
581 | luaK_patchtohere(fs, e->f); | ||
582 | e->f = NO_JUMP; | ||
583 | } | ||
584 | |||
585 | |||
586 | static void codenot (FuncState *fs, expdesc *e) { | ||
587 | luaK_dischargevars(fs, e); | ||
588 | switch (e->k) { | ||
589 | case VNIL: case VFALSE: { | ||
590 | e->k = VTRUE; | ||
591 | break; | ||
592 | } | ||
593 | case VK: case VKNUM: case VTRUE: { | ||
594 | e->k = VFALSE; | ||
595 | break; | ||
596 | } | ||
597 | case VJMP: { | ||
598 | invertjump(fs, e); | ||
599 | break; | ||
600 | } | ||
601 | case VRELOCABLE: | ||
602 | case VNONRELOC: { | ||
603 | discharge2anyreg(fs, e); | ||
604 | freeexp(fs, e); | ||
605 | e->u.s.info = luaK_codeABC(fs, OP_NOT, 0, e->u.s.info, 0); | ||
606 | e->k = VRELOCABLE; | ||
607 | break; | ||
608 | } | ||
609 | default: { | ||
610 | lua_assert(0); /* cannot happen */ | ||
611 | break; | ||
612 | } | ||
613 | } | ||
614 | /* interchange true and false lists */ | ||
615 | { int temp = e->f; e->f = e->t; e->t = temp; } | ||
616 | removevalues(fs, e->f); | ||
617 | removevalues(fs, e->t); | ||
618 | } | ||
619 | |||
620 | |||
621 | void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k) { | ||
622 | t->u.s.aux = luaK_exp2RK(fs, k); | ||
623 | t->k = VINDEXED; | ||
624 | } | ||
625 | |||
626 | |||
627 | static int constfolding (OpCode op, expdesc *e1, expdesc *e2) { | ||
628 | lua_Number v1, v2, r; | ||
629 | if (!isnumeral(e1) || !isnumeral(e2)) return 0; | ||
630 | v1 = e1->u.nval; | ||
631 | v2 = e2->u.nval; | ||
632 | switch (op) { | ||
633 | case OP_ADD: r = luai_numadd(v1, v2); break; | ||
634 | case OP_SUB: r = luai_numsub(v1, v2); break; | ||
635 | case OP_MUL: r = luai_nummul(v1, v2); break; | ||
636 | case OP_DIV: | ||
637 | if (v2 == 0) return 0; /* do not attempt to divide by 0 */ | ||
638 | r = luai_numdiv(v1, v2); break; | ||
639 | case OP_MOD: | ||
640 | if (v2 == 0) return 0; /* do not attempt to divide by 0 */ | ||
641 | r = luai_nummod(v1, v2); break; | ||
642 | case OP_POW: r = luai_numpow(v1, v2); break; | ||
643 | case OP_UNM: r = luai_numunm(v1); break; | ||
644 | case OP_LEN: return 0; /* no constant folding for 'len' */ | ||
645 | default: lua_assert(0); r = 0; break; | ||
646 | } | ||
647 | if (luai_numisnan(r)) return 0; /* do not attempt to produce NaN */ | ||
648 | e1->u.nval = r; | ||
649 | return 1; | ||
650 | } | ||
651 | |||
652 | |||
653 | static void codearith (FuncState *fs, OpCode op, expdesc *e1, expdesc *e2) { | ||
654 | if (constfolding(op, e1, e2)) | ||
655 | return; | ||
656 | else { | ||
657 | int o2 = (op != OP_UNM && op != OP_LEN) ? luaK_exp2RK(fs, e2) : 0; | ||
658 | int o1 = luaK_exp2RK(fs, e1); | ||
659 | if (o1 > o2) { | ||
660 | freeexp(fs, e1); | ||
661 | freeexp(fs, e2); | ||
662 | } | ||
663 | else { | ||
664 | freeexp(fs, e2); | ||
665 | freeexp(fs, e1); | ||
666 | } | ||
667 | e1->u.s.info = luaK_codeABC(fs, op, 0, o1, o2); | ||
668 | e1->k = VRELOCABLE; | ||
669 | } | ||
670 | } | ||
671 | |||
672 | |||
673 | static void codecomp (FuncState *fs, OpCode op, int cond, expdesc *e1, | ||
674 | expdesc *e2) { | ||
675 | int o1 = luaK_exp2RK(fs, e1); | ||
676 | int o2 = luaK_exp2RK(fs, e2); | ||
677 | freeexp(fs, e2); | ||
678 | freeexp(fs, e1); | ||
679 | if (cond == 0 && op != OP_EQ) { | ||
680 | int temp; /* exchange args to replace by `<' or `<=' */ | ||
681 | temp = o1; o1 = o2; o2 = temp; /* o1 <==> o2 */ | ||
682 | cond = 1; | ||
683 | } | ||
684 | e1->u.s.info = condjump(fs, op, cond, o1, o2); | ||
685 | e1->k = VJMP; | ||
686 | } | ||
687 | |||
688 | |||
689 | void luaK_prefix (FuncState *fs, UnOpr op, expdesc *e) { | ||
690 | expdesc e2; | ||
691 | e2.t = e2.f = NO_JUMP; e2.k = VKNUM; e2.u.nval = 0; | ||
692 | switch (op) { | ||
693 | case OPR_MINUS: { | ||
694 | if (!isnumeral(e)) | ||
695 | luaK_exp2anyreg(fs, e); /* cannot operate on non-numeric constants */ | ||
696 | codearith(fs, OP_UNM, e, &e2); | ||
697 | break; | ||
698 | } | ||
699 | case OPR_NOT: codenot(fs, e); break; | ||
700 | case OPR_LEN: { | ||
701 | luaK_exp2anyreg(fs, e); /* cannot operate on constants */ | ||
702 | codearith(fs, OP_LEN, e, &e2); | ||
703 | break; | ||
704 | } | ||
705 | default: lua_assert(0); | ||
706 | } | ||
707 | } | ||
708 | |||
709 | |||
710 | void luaK_infix (FuncState *fs, BinOpr op, expdesc *v) { | ||
711 | switch (op) { | ||
712 | case OPR_AND: { | ||
713 | luaK_goiftrue(fs, v); | ||
714 | break; | ||
715 | } | ||
716 | case OPR_OR: { | ||
717 | luaK_goiffalse(fs, v); | ||
718 | break; | ||
719 | } | ||
720 | case OPR_CONCAT: { | ||
721 | luaK_exp2nextreg(fs, v); /* operand must be on the `stack' */ | ||
722 | break; | ||
723 | } | ||
724 | case OPR_ADD: case OPR_SUB: case OPR_MUL: case OPR_DIV: | ||
725 | case OPR_MOD: case OPR_POW: { | ||
726 | if (!isnumeral(v)) luaK_exp2RK(fs, v); | ||
727 | break; | ||
728 | } | ||
729 | default: { | ||
730 | luaK_exp2RK(fs, v); | ||
731 | break; | ||
732 | } | ||
733 | } | ||
734 | } | ||
735 | |||
736 | |||
737 | void luaK_posfix (FuncState *fs, BinOpr op, expdesc *e1, expdesc *e2) { | ||
738 | switch (op) { | ||
739 | case OPR_AND: { | ||
740 | lua_assert(e1->t == NO_JUMP); /* list must be closed */ | ||
741 | luaK_dischargevars(fs, e2); | ||
742 | luaK_concat(fs, &e2->f, e1->f); | ||
743 | *e1 = *e2; | ||
744 | break; | ||
745 | } | ||
746 | case OPR_OR: { | ||
747 | lua_assert(e1->f == NO_JUMP); /* list must be closed */ | ||
748 | luaK_dischargevars(fs, e2); | ||
749 | luaK_concat(fs, &e2->t, e1->t); | ||
750 | *e1 = *e2; | ||
751 | break; | ||
752 | } | ||
753 | case OPR_CONCAT: { | ||
754 | luaK_exp2val(fs, e2); | ||
755 | if (e2->k == VRELOCABLE && GET_OPCODE(getcode(fs, e2)) == OP_CONCAT) { | ||
756 | lua_assert(e1->u.s.info == GETARG_B(getcode(fs, e2))-1); | ||
757 | freeexp(fs, e1); | ||
758 | SETARG_B(getcode(fs, e2), e1->u.s.info); | ||
759 | e1->k = VRELOCABLE; e1->u.s.info = e2->u.s.info; | ||
760 | } | ||
761 | else { | ||
762 | luaK_exp2nextreg(fs, e2); /* operand must be on the 'stack' */ | ||
763 | codearith(fs, OP_CONCAT, e1, e2); | ||
764 | } | ||
765 | break; | ||
766 | } | ||
767 | case OPR_ADD: codearith(fs, OP_ADD, e1, e2); break; | ||
768 | case OPR_SUB: codearith(fs, OP_SUB, e1, e2); break; | ||
769 | case OPR_MUL: codearith(fs, OP_MUL, e1, e2); break; | ||
770 | case OPR_DIV: codearith(fs, OP_DIV, e1, e2); break; | ||
771 | case OPR_MOD: codearith(fs, OP_MOD, e1, e2); break; | ||
772 | case OPR_POW: codearith(fs, OP_POW, e1, e2); break; | ||
773 | case OPR_EQ: codecomp(fs, OP_EQ, 1, e1, e2); break; | ||
774 | case OPR_NE: codecomp(fs, OP_EQ, 0, e1, e2); break; | ||
775 | case OPR_LT: codecomp(fs, OP_LT, 1, e1, e2); break; | ||
776 | case OPR_LE: codecomp(fs, OP_LE, 1, e1, e2); break; | ||
777 | case OPR_GT: codecomp(fs, OP_LT, 0, e1, e2); break; | ||
778 | case OPR_GE: codecomp(fs, OP_LE, 0, e1, e2); break; | ||
779 | default: lua_assert(0); | ||
780 | } | ||
781 | } | ||
782 | |||
783 | |||
784 | void luaK_fixline (FuncState *fs, int line) { | ||
785 | fs->f->lineinfo[fs->pc - 1] = line; | ||
786 | } | ||
787 | |||
788 | |||
789 | static int luaK_code (FuncState *fs, Instruction i, int line) { | ||
790 | Proto *f = fs->f; | ||
791 | dischargejpc(fs); /* `pc' will change */ | ||
792 | /* put new instruction in code array */ | ||
793 | luaM_growvector(fs->L, f->code, fs->pc, f->sizecode, Instruction, | ||
794 | MAX_INT, "code size overflow"); | ||
795 | f->code[fs->pc] = i; | ||
796 | /* save corresponding line information */ | ||
797 | luaM_growvector(fs->L, f->lineinfo, fs->pc, f->sizelineinfo, int, | ||
798 | MAX_INT, "code size overflow"); | ||
799 | f->lineinfo[fs->pc] = line; | ||
800 | return fs->pc++; | ||
801 | } | ||
802 | |||
803 | |||
804 | int luaK_codeABC (FuncState *fs, OpCode o, int a, int b, int c) { | ||
805 | lua_assert(getOpMode(o) == iABC); | ||
806 | lua_assert(getBMode(o) != OpArgN || b == 0); | ||
807 | lua_assert(getCMode(o) != OpArgN || c == 0); | ||
808 | return luaK_code(fs, CREATE_ABC(o, a, b, c), fs->ls->lastline); | ||
809 | } | ||
810 | |||
811 | |||
812 | int luaK_codeABx (FuncState *fs, OpCode o, int a, unsigned int bc) { | ||
813 | lua_assert(getOpMode(o) == iABx || getOpMode(o) == iAsBx); | ||
814 | lua_assert(getCMode(o) == OpArgN); | ||
815 | return luaK_code(fs, CREATE_ABx(o, a, bc), fs->ls->lastline); | ||
816 | } | ||
817 | |||
818 | |||
819 | void luaK_setlist (FuncState *fs, int base, int nelems, int tostore) { | ||
820 | int c = (nelems - 1)/LFIELDS_PER_FLUSH + 1; | ||
821 | int b = (tostore == LUA_MULTRET) ? 0 : tostore; | ||
822 | lua_assert(tostore != 0); | ||
823 | if (c <= MAXARG_C) | ||
824 | luaK_codeABC(fs, OP_SETLIST, base, b, c); | ||
825 | else { | ||
826 | luaK_codeABC(fs, OP_SETLIST, base, b, 0); | ||
827 | luaK_code(fs, cast(Instruction, c), fs->ls->lastline); | ||
828 | } | ||
829 | fs->freereg = base + 1; /* free registers with list values */ | ||
830 | } | ||
831 | |||