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author | Maurus Cuelenaere <mcuelenaere@gmail.com> | 2009-05-21 19:01:41 +0000 |
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committer | Maurus Cuelenaere <mcuelenaere@gmail.com> | 2009-05-21 19:01:41 +0000 |
commit | cf87597226f5d6b269f1f2c4d6f402aa1eccb852 (patch) | |
tree | 4ba1f3ae53b3bd9cae0e2c6c4dd57836b43a5ece /apps/plugins/lua/ldo.c | |
parent | c483efadc63eaed35b5fb5e4e02c2282daf32470 (diff) | |
download | rockbox-cf87597226f5d6b269f1f2c4d6f402aa1eccb852.tar.gz rockbox-cf87597226f5d6b269f1f2c4d6f402aa1eccb852.zip |
Commit FS#9174: Lua scripting language by Dan Everton
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21020 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/plugins/lua/ldo.c')
-rw-r--r-- | apps/plugins/lua/ldo.c | 518 |
1 files changed, 518 insertions, 0 deletions
diff --git a/apps/plugins/lua/ldo.c b/apps/plugins/lua/ldo.c new file mode 100644 index 0000000000..f303c744c7 --- /dev/null +++ b/apps/plugins/lua/ldo.c | |||
@@ -0,0 +1,518 @@ | |||
1 | /* | ||
2 | ** $Id: ldo.c,v 2.38.1.3 2008/01/18 22:31:22 roberto Exp $ | ||
3 | ** Stack and Call structure of Lua | ||
4 | ** See Copyright Notice in lua.h | ||
5 | */ | ||
6 | |||
7 | |||
8 | /* #include <setjmp.h> */ | ||
9 | #include <stdlib.h> | ||
10 | #include <string.h> | ||
11 | |||
12 | #define ldo_c | ||
13 | #define LUA_CORE | ||
14 | |||
15 | #include "lua.h" | ||
16 | |||
17 | #include "ldebug.h" | ||
18 | #include "ldo.h" | ||
19 | #include "lfunc.h" | ||
20 | #include "lgc.h" | ||
21 | #include "lmem.h" | ||
22 | #include "lobject.h" | ||
23 | #include "lopcodes.h" | ||
24 | #include "lparser.h" | ||
25 | #include "lstate.h" | ||
26 | #include "lstring.h" | ||
27 | #include "ltable.h" | ||
28 | #include "ltm.h" | ||
29 | #include "lundump.h" | ||
30 | #include "lvm.h" | ||
31 | #include "lzio.h" | ||
32 | |||
33 | |||
34 | |||
35 | |||
36 | /* | ||
37 | ** {====================================================== | ||
38 | ** Error-recovery functions | ||
39 | ** ======================================================= | ||
40 | */ | ||
41 | |||
42 | |||
43 | /* chain list of long jump buffers */ | ||
44 | struct lua_longjmp { | ||
45 | struct lua_longjmp *previous; | ||
46 | luai_jmpbuf b; | ||
47 | volatile int status; /* error code */ | ||
48 | }; | ||
49 | |||
50 | |||
51 | void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop) { | ||
52 | switch (errcode) { | ||
53 | case LUA_ERRMEM: { | ||
54 | setsvalue2s(L, oldtop, luaS_newliteral(L, MEMERRMSG)); | ||
55 | break; | ||
56 | } | ||
57 | case LUA_ERRERR: { | ||
58 | setsvalue2s(L, oldtop, luaS_newliteral(L, "error in error handling")); | ||
59 | break; | ||
60 | } | ||
61 | case LUA_ERRSYNTAX: | ||
62 | case LUA_ERRRUN: { | ||
63 | setobjs2s(L, oldtop, L->top - 1); /* error message on current top */ | ||
64 | break; | ||
65 | } | ||
66 | } | ||
67 | L->top = oldtop + 1; | ||
68 | } | ||
69 | |||
70 | |||
71 | static void restore_stack_limit (lua_State *L) { | ||
72 | lua_assert(L->stack_last - L->stack == L->stacksize - EXTRA_STACK - 1); | ||
73 | if (L->size_ci > LUAI_MAXCALLS) { /* there was an overflow? */ | ||
74 | int inuse = cast_int(L->ci - L->base_ci); | ||
75 | if (inuse + 1 < LUAI_MAXCALLS) /* can `undo' overflow? */ | ||
76 | luaD_reallocCI(L, LUAI_MAXCALLS); | ||
77 | } | ||
78 | } | ||
79 | |||
80 | |||
81 | static void resetstack (lua_State *L, int status) { | ||
82 | L->ci = L->base_ci; | ||
83 | L->base = L->ci->base; | ||
84 | luaF_close(L, L->base); /* close eventual pending closures */ | ||
85 | luaD_seterrorobj(L, status, L->base); | ||
86 | L->nCcalls = L->baseCcalls; | ||
87 | L->allowhook = 1; | ||
88 | restore_stack_limit(L); | ||
89 | L->errfunc = 0; | ||
90 | L->errorJmp = NULL; | ||
91 | } | ||
92 | |||
93 | |||
94 | void luaD_throw (lua_State *L, int errcode) { | ||
95 | if (L->errorJmp) { | ||
96 | L->errorJmp->status = errcode; | ||
97 | LUAI_THROW(L, L->errorJmp); | ||
98 | } | ||
99 | else { | ||
100 | L->status = cast_byte(errcode); | ||
101 | if (G(L)->panic) { | ||
102 | resetstack(L, errcode); | ||
103 | lua_unlock(L); | ||
104 | G(L)->panic(L); | ||
105 | } | ||
106 | exit(EXIT_FAILURE); | ||
107 | } | ||
108 | } | ||
109 | |||
110 | |||
111 | int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud) { | ||
112 | struct lua_longjmp lj; | ||
113 | lj.status = 0; | ||
114 | lj.previous = L->errorJmp; /* chain new error handler */ | ||
115 | L->errorJmp = &lj; | ||
116 | LUAI_TRY(L, &lj, | ||
117 | (*f)(L, ud); | ||
118 | ); | ||
119 | L->errorJmp = lj.previous; /* restore old error handler */ | ||
120 | return lj.status; | ||
121 | } | ||
122 | |||
123 | /* }====================================================== */ | ||
124 | |||
125 | |||
126 | static void correctstack (lua_State *L, TValue *oldstack) { | ||
127 | CallInfo *ci; | ||
128 | GCObject *up; | ||
129 | L->top = (L->top - oldstack) + L->stack; | ||
130 | for (up = L->openupval; up != NULL; up = up->gch.next) | ||
131 | gco2uv(up)->v = (gco2uv(up)->v - oldstack) + L->stack; | ||
132 | for (ci = L->base_ci; ci <= L->ci; ci++) { | ||
133 | ci->top = (ci->top - oldstack) + L->stack; | ||
134 | ci->base = (ci->base - oldstack) + L->stack; | ||
135 | ci->func = (ci->func - oldstack) + L->stack; | ||
136 | } | ||
137 | L->base = (L->base - oldstack) + L->stack; | ||
138 | } | ||
139 | |||
140 | |||
141 | void luaD_reallocstack (lua_State *L, int newsize) { | ||
142 | TValue *oldstack = L->stack; | ||
143 | int realsize = newsize + 1 + EXTRA_STACK; | ||
144 | lua_assert(L->stack_last - L->stack == L->stacksize - EXTRA_STACK - 1); | ||
145 | luaM_reallocvector(L, L->stack, L->stacksize, realsize, TValue); | ||
146 | L->stacksize = realsize; | ||
147 | L->stack_last = L->stack+newsize; | ||
148 | correctstack(L, oldstack); | ||
149 | } | ||
150 | |||
151 | |||
152 | void luaD_reallocCI (lua_State *L, int newsize) { | ||
153 | CallInfo *oldci = L->base_ci; | ||
154 | luaM_reallocvector(L, L->base_ci, L->size_ci, newsize, CallInfo); | ||
155 | L->size_ci = newsize; | ||
156 | L->ci = (L->ci - oldci) + L->base_ci; | ||
157 | L->end_ci = L->base_ci + L->size_ci - 1; | ||
158 | } | ||
159 | |||
160 | |||
161 | void luaD_growstack (lua_State *L, int n) { | ||
162 | if (n <= L->stacksize) /* double size is enough? */ | ||
163 | luaD_reallocstack(L, 2*L->stacksize); | ||
164 | else | ||
165 | luaD_reallocstack(L, L->stacksize + n); | ||
166 | } | ||
167 | |||
168 | |||
169 | static CallInfo *growCI (lua_State *L) { | ||
170 | if (L->size_ci > LUAI_MAXCALLS) /* overflow while handling overflow? */ | ||
171 | luaD_throw(L, LUA_ERRERR); | ||
172 | else { | ||
173 | luaD_reallocCI(L, 2*L->size_ci); | ||
174 | if (L->size_ci > LUAI_MAXCALLS) | ||
175 | luaG_runerror(L, "stack overflow"); | ||
176 | } | ||
177 | return ++L->ci; | ||
178 | } | ||
179 | |||
180 | |||
181 | void luaD_callhook (lua_State *L, int event, int line) { | ||
182 | lua_Hook hook = L->hook; | ||
183 | if (hook && L->allowhook) { | ||
184 | ptrdiff_t top = savestack(L, L->top); | ||
185 | ptrdiff_t ci_top = savestack(L, L->ci->top); | ||
186 | lua_Debug ar; | ||
187 | ar.event = event; | ||
188 | ar.currentline = line; | ||
189 | if (event == LUA_HOOKTAILRET) | ||
190 | ar.i_ci = 0; /* tail call; no debug information about it */ | ||
191 | else | ||
192 | ar.i_ci = cast_int(L->ci - L->base_ci); | ||
193 | luaD_checkstack(L, LUA_MINSTACK); /* ensure minimum stack size */ | ||
194 | L->ci->top = L->top + LUA_MINSTACK; | ||
195 | lua_assert(L->ci->top <= L->stack_last); | ||
196 | L->allowhook = 0; /* cannot call hooks inside a hook */ | ||
197 | lua_unlock(L); | ||
198 | (*hook)(L, &ar); | ||
199 | lua_lock(L); | ||
200 | lua_assert(!L->allowhook); | ||
201 | L->allowhook = 1; | ||
202 | L->ci->top = restorestack(L, ci_top); | ||
203 | L->top = restorestack(L, top); | ||
204 | } | ||
205 | } | ||
206 | |||
207 | |||
208 | static StkId adjust_varargs (lua_State *L, Proto *p, int actual) { | ||
209 | int i; | ||
210 | int nfixargs = p->numparams; | ||
211 | Table *htab = NULL; | ||
212 | StkId base, fixed; | ||
213 | for (; actual < nfixargs; ++actual) | ||
214 | setnilvalue(L->top++); | ||
215 | #if defined(LUA_COMPAT_VARARG) | ||
216 | if (p->is_vararg & VARARG_NEEDSARG) { /* compat. with old-style vararg? */ | ||
217 | int nvar = actual - nfixargs; /* number of extra arguments */ | ||
218 | lua_assert(p->is_vararg & VARARG_HASARG); | ||
219 | luaC_checkGC(L); | ||
220 | htab = luaH_new(L, nvar, 1); /* create `arg' table */ | ||
221 | for (i=0; i<nvar; i++) /* put extra arguments into `arg' table */ | ||
222 | setobj2n(L, luaH_setnum(L, htab, i+1), L->top - nvar + i); | ||
223 | /* store counter in field `n' */ | ||
224 | setnvalue(luaH_setstr(L, htab, luaS_newliteral(L, "n")), cast_num(nvar)); | ||
225 | } | ||
226 | #endif | ||
227 | /* move fixed parameters to final position */ | ||
228 | fixed = L->top - actual; /* first fixed argument */ | ||
229 | base = L->top; /* final position of first argument */ | ||
230 | for (i=0; i<nfixargs; i++) { | ||
231 | setobjs2s(L, L->top++, fixed+i); | ||
232 | setnilvalue(fixed+i); | ||
233 | } | ||
234 | /* add `arg' parameter */ | ||
235 | if (htab) { | ||
236 | sethvalue(L, L->top++, htab); | ||
237 | lua_assert(iswhite(obj2gco(htab))); | ||
238 | } | ||
239 | return base; | ||
240 | } | ||
241 | |||
242 | |||
243 | static StkId tryfuncTM (lua_State *L, StkId func) { | ||
244 | const TValue *tm = luaT_gettmbyobj(L, func, TM_CALL); | ||
245 | StkId p; | ||
246 | ptrdiff_t funcr = savestack(L, func); | ||
247 | if (!ttisfunction(tm)) | ||
248 | luaG_typeerror(L, func, "call"); | ||
249 | /* Open a hole inside the stack at `func' */ | ||
250 | for (p = L->top; p > func; p--) setobjs2s(L, p, p-1); | ||
251 | incr_top(L); | ||
252 | func = restorestack(L, funcr); /* previous call may change stack */ | ||
253 | setobj2s(L, func, tm); /* tag method is the new function to be called */ | ||
254 | return func; | ||
255 | } | ||
256 | |||
257 | |||
258 | |||
259 | #define inc_ci(L) \ | ||
260 | ((L->ci == L->end_ci) ? growCI(L) : \ | ||
261 | (condhardstacktests(luaD_reallocCI(L, L->size_ci)), ++L->ci)) | ||
262 | |||
263 | |||
264 | int luaD_precall (lua_State *L, StkId func, int nresults) { | ||
265 | LClosure *cl; | ||
266 | ptrdiff_t funcr; | ||
267 | if (!ttisfunction(func)) /* `func' is not a function? */ | ||
268 | func = tryfuncTM(L, func); /* check the `function' tag method */ | ||
269 | funcr = savestack(L, func); | ||
270 | cl = &clvalue(func)->l; | ||
271 | L->ci->savedpc = L->savedpc; | ||
272 | if (!cl->isC) { /* Lua function? prepare its call */ | ||
273 | CallInfo *ci; | ||
274 | StkId st, base; | ||
275 | Proto *p = cl->p; | ||
276 | luaD_checkstack(L, p->maxstacksize); | ||
277 | func = restorestack(L, funcr); | ||
278 | if (!p->is_vararg) { /* no varargs? */ | ||
279 | base = func + 1; | ||
280 | if (L->top > base + p->numparams) | ||
281 | L->top = base + p->numparams; | ||
282 | } | ||
283 | else { /* vararg function */ | ||
284 | int nargs = cast_int(L->top - func) - 1; | ||
285 | base = adjust_varargs(L, p, nargs); | ||
286 | func = restorestack(L, funcr); /* previous call may change the stack */ | ||
287 | } | ||
288 | ci = inc_ci(L); /* now `enter' new function */ | ||
289 | ci->func = func; | ||
290 | L->base = ci->base = base; | ||
291 | ci->top = L->base + p->maxstacksize; | ||
292 | lua_assert(ci->top <= L->stack_last); | ||
293 | L->savedpc = p->code; /* starting point */ | ||
294 | ci->tailcalls = 0; | ||
295 | ci->nresults = nresults; | ||
296 | for (st = L->top; st < ci->top; st++) | ||
297 | setnilvalue(st); | ||
298 | L->top = ci->top; | ||
299 | if (L->hookmask & LUA_MASKCALL) { | ||
300 | L->savedpc++; /* hooks assume 'pc' is already incremented */ | ||
301 | luaD_callhook(L, LUA_HOOKCALL, -1); | ||
302 | L->savedpc--; /* correct 'pc' */ | ||
303 | } | ||
304 | return PCRLUA; | ||
305 | } | ||
306 | else { /* if is a C function, call it */ | ||
307 | CallInfo *ci; | ||
308 | int n; | ||
309 | luaD_checkstack(L, LUA_MINSTACK); /* ensure minimum stack size */ | ||
310 | ci = inc_ci(L); /* now `enter' new function */ | ||
311 | ci->func = restorestack(L, funcr); | ||
312 | L->base = ci->base = ci->func + 1; | ||
313 | ci->top = L->top + LUA_MINSTACK; | ||
314 | lua_assert(ci->top <= L->stack_last); | ||
315 | ci->nresults = nresults; | ||
316 | if (L->hookmask & LUA_MASKCALL) | ||
317 | luaD_callhook(L, LUA_HOOKCALL, -1); | ||
318 | lua_unlock(L); | ||
319 | n = (*curr_func(L)->c.f)(L); /* do the actual call */ | ||
320 | lua_lock(L); | ||
321 | if (n < 0) /* yielding? */ | ||
322 | return PCRYIELD; | ||
323 | else { | ||
324 | luaD_poscall(L, L->top - n); | ||
325 | return PCRC; | ||
326 | } | ||
327 | } | ||
328 | } | ||
329 | |||
330 | |||
331 | static StkId callrethooks (lua_State *L, StkId firstResult) { | ||
332 | ptrdiff_t fr = savestack(L, firstResult); /* next call may change stack */ | ||
333 | luaD_callhook(L, LUA_HOOKRET, -1); | ||
334 | if (f_isLua(L->ci)) { /* Lua function? */ | ||
335 | while ((L->hookmask & LUA_MASKRET) && L->ci->tailcalls--) /* tail calls */ | ||
336 | luaD_callhook(L, LUA_HOOKTAILRET, -1); | ||
337 | } | ||
338 | return restorestack(L, fr); | ||
339 | } | ||
340 | |||
341 | |||
342 | int luaD_poscall (lua_State *L, StkId firstResult) { | ||
343 | StkId res; | ||
344 | int wanted, i; | ||
345 | CallInfo *ci; | ||
346 | if (L->hookmask & LUA_MASKRET) | ||
347 | firstResult = callrethooks(L, firstResult); | ||
348 | ci = L->ci--; | ||
349 | res = ci->func; /* res == final position of 1st result */ | ||
350 | wanted = ci->nresults; | ||
351 | L->base = (ci - 1)->base; /* restore base */ | ||
352 | L->savedpc = (ci - 1)->savedpc; /* restore savedpc */ | ||
353 | /* move results to correct place */ | ||
354 | for (i = wanted; i != 0 && firstResult < L->top; i--) | ||
355 | setobjs2s(L, res++, firstResult++); | ||
356 | while (i-- > 0) | ||
357 | setnilvalue(res++); | ||
358 | L->top = res; | ||
359 | return (wanted - LUA_MULTRET); /* 0 iff wanted == LUA_MULTRET */ | ||
360 | } | ||
361 | |||
362 | |||
363 | /* | ||
364 | ** Call a function (C or Lua). The function to be called is at *func. | ||
365 | ** The arguments are on the stack, right after the function. | ||
366 | ** When returns, all the results are on the stack, starting at the original | ||
367 | ** function position. | ||
368 | */ | ||
369 | void luaD_call (lua_State *L, StkId func, int nResults) { | ||
370 | if (++L->nCcalls >= LUAI_MAXCCALLS) { | ||
371 | if (L->nCcalls == LUAI_MAXCCALLS) | ||
372 | luaG_runerror(L, "C stack overflow"); | ||
373 | else if (L->nCcalls >= (LUAI_MAXCCALLS + (LUAI_MAXCCALLS>>3))) | ||
374 | luaD_throw(L, LUA_ERRERR); /* error while handing stack error */ | ||
375 | } | ||
376 | if (luaD_precall(L, func, nResults) == PCRLUA) /* is a Lua function? */ | ||
377 | luaV_execute(L, 1); /* call it */ | ||
378 | L->nCcalls--; | ||
379 | luaC_checkGC(L); | ||
380 | } | ||
381 | |||
382 | |||
383 | static void resume (lua_State *L, void *ud) { | ||
384 | StkId firstArg = cast(StkId, ud); | ||
385 | CallInfo *ci = L->ci; | ||
386 | if (L->status == 0) { /* start coroutine? */ | ||
387 | lua_assert(ci == L->base_ci && firstArg > L->base); | ||
388 | if (luaD_precall(L, firstArg - 1, LUA_MULTRET) != PCRLUA) | ||
389 | return; | ||
390 | } | ||
391 | else { /* resuming from previous yield */ | ||
392 | lua_assert(L->status == LUA_YIELD); | ||
393 | L->status = 0; | ||
394 | if (!f_isLua(ci)) { /* `common' yield? */ | ||
395 | /* finish interrupted execution of `OP_CALL' */ | ||
396 | lua_assert(GET_OPCODE(*((ci-1)->savedpc - 1)) == OP_CALL || | ||
397 | GET_OPCODE(*((ci-1)->savedpc - 1)) == OP_TAILCALL); | ||
398 | if (luaD_poscall(L, firstArg)) /* complete it... */ | ||
399 | L->top = L->ci->top; /* and correct top if not multiple results */ | ||
400 | } | ||
401 | else /* yielded inside a hook: just continue its execution */ | ||
402 | L->base = L->ci->base; | ||
403 | } | ||
404 | luaV_execute(L, cast_int(L->ci - L->base_ci)); | ||
405 | } | ||
406 | |||
407 | |||
408 | static int resume_error (lua_State *L, const char *msg) { | ||
409 | L->top = L->ci->base; | ||
410 | setsvalue2s(L, L->top, luaS_new(L, msg)); | ||
411 | incr_top(L); | ||
412 | lua_unlock(L); | ||
413 | return LUA_ERRRUN; | ||
414 | } | ||
415 | |||
416 | |||
417 | LUA_API int lua_resume (lua_State *L, int nargs) { | ||
418 | int status; | ||
419 | lua_lock(L); | ||
420 | if (L->status != LUA_YIELD && (L->status != 0 || L->ci != L->base_ci)) | ||
421 | return resume_error(L, "cannot resume non-suspended coroutine"); | ||
422 | if (L->nCcalls >= LUAI_MAXCCALLS) | ||
423 | return resume_error(L, "C stack overflow"); | ||
424 | luai_userstateresume(L, nargs); | ||
425 | lua_assert(L->errfunc == 0); | ||
426 | L->baseCcalls = ++L->nCcalls; | ||
427 | status = luaD_rawrunprotected(L, resume, L->top - nargs); | ||
428 | if (status != 0) { /* error? */ | ||
429 | L->status = cast_byte(status); /* mark thread as `dead' */ | ||
430 | luaD_seterrorobj(L, status, L->top); | ||
431 | L->ci->top = L->top; | ||
432 | } | ||
433 | else { | ||
434 | lua_assert(L->nCcalls == L->baseCcalls); | ||
435 | status = L->status; | ||
436 | } | ||
437 | --L->nCcalls; | ||
438 | lua_unlock(L); | ||
439 | return status; | ||
440 | } | ||
441 | |||
442 | |||
443 | LUA_API int lua_yield (lua_State *L, int nresults) { | ||
444 | luai_userstateyield(L, nresults); | ||
445 | lua_lock(L); | ||
446 | if (L->nCcalls > L->baseCcalls) | ||
447 | luaG_runerror(L, "attempt to yield across metamethod/C-call boundary"); | ||
448 | L->base = L->top - nresults; /* protect stack slots below */ | ||
449 | L->status = LUA_YIELD; | ||
450 | lua_unlock(L); | ||
451 | return -1; | ||
452 | } | ||
453 | |||
454 | |||
455 | int luaD_pcall (lua_State *L, Pfunc func, void *u, | ||
456 | ptrdiff_t old_top, ptrdiff_t ef) { | ||
457 | int status; | ||
458 | unsigned short oldnCcalls = L->nCcalls; | ||
459 | ptrdiff_t old_ci = saveci(L, L->ci); | ||
460 | lu_byte old_allowhooks = L->allowhook; | ||
461 | ptrdiff_t old_errfunc = L->errfunc; | ||
462 | L->errfunc = ef; | ||
463 | status = luaD_rawrunprotected(L, func, u); | ||
464 | if (status != 0) { /* an error occurred? */ | ||
465 | StkId oldtop = restorestack(L, old_top); | ||
466 | luaF_close(L, oldtop); /* close eventual pending closures */ | ||
467 | luaD_seterrorobj(L, status, oldtop); | ||
468 | L->nCcalls = oldnCcalls; | ||
469 | L->ci = restoreci(L, old_ci); | ||
470 | L->base = L->ci->base; | ||
471 | L->savedpc = L->ci->savedpc; | ||
472 | L->allowhook = old_allowhooks; | ||
473 | restore_stack_limit(L); | ||
474 | } | ||
475 | L->errfunc = old_errfunc; | ||
476 | return status; | ||
477 | } | ||
478 | |||
479 | |||
480 | |||
481 | /* | ||
482 | ** Execute a protected parser. | ||
483 | */ | ||
484 | struct SParser { /* data to `f_parser' */ | ||
485 | ZIO *z; | ||
486 | Mbuffer buff; /* buffer to be used by the scanner */ | ||
487 | const char *name; | ||
488 | }; | ||
489 | |||
490 | static void f_parser (lua_State *L, void *ud) { | ||
491 | int i; | ||
492 | Proto *tf; | ||
493 | Closure *cl; | ||
494 | struct SParser *p = cast(struct SParser *, ud); | ||
495 | int c = luaZ_lookahead(p->z); | ||
496 | luaC_checkGC(L); | ||
497 | tf = ((c == LUA_SIGNATURE[0]) ? luaU_undump : luaY_parser)(L, p->z, | ||
498 | &p->buff, p->name); | ||
499 | cl = luaF_newLclosure(L, tf->nups, hvalue(gt(L))); | ||
500 | cl->l.p = tf; | ||
501 | for (i = 0; i < tf->nups; i++) /* initialize eventual upvalues */ | ||
502 | cl->l.upvals[i] = luaF_newupval(L); | ||
503 | setclvalue(L, L->top, cl); | ||
504 | incr_top(L); | ||
505 | } | ||
506 | |||
507 | |||
508 | int luaD_protectedparser (lua_State *L, ZIO *z, const char *name) { | ||
509 | struct SParser p; | ||
510 | int status; | ||
511 | p.z = z; p.name = name; | ||
512 | luaZ_initbuffer(L, &p.buff); | ||
513 | status = luaD_pcall(L, f_parser, &p, savestack(L, L->top), L->errfunc); | ||
514 | luaZ_freebuffer(L, &p.buff); | ||
515 | return status; | ||
516 | } | ||
517 | |||
518 | |||