src/lj_ctype.c

   1 /*
   2 ** C type management.
   3 ** Copyright (C) 2005-2012 Mike Pall. See Copyright Notice in luajit.h
   4 */
   5
   6 #include "lj_obj.h"
   7
   8 #if LJ_HASFFI
   9
  10 #include "lj_gc.h"
  11 #include "lj_err.h"
  12 #include "lj_str.h"
  13 #include "lj_tab.h"
  14 #include "lj_ctype.h"
  15 #include "lj_ccallback.h"
  16
  17 /* -- C type definitions -------------------------------------------------- */
  18
  19 /* Predefined typedefs. */
  20 #define CTTDDEF(_) \
  21   /* Vararg handling. */ \
  22   _("va_list",                  P_VOID) \
  23   _("__builtin_va_list",        P_VOID) \
  24   _("__gnuc_va_list",           P_VOID) \
  25   /* From stddef.h. */ \
  26   _("ptrdiff_t",                INT_PSZ) \
  27   _("size_t",                   UINT_PSZ) \
  28   _("wchar_t",                  WCHAR) \
  29   /* Subset of stdint.h. */ \
  30   _("int8_t",                   INT8) \
  31   _("int16_t",                  INT16) \
  32   _("int32_t",                  INT32) \
  33   _("int64_t",                  INT64) \
  34   _("uint8_t",                  UINT8) \
  35   _("uint16_t",                 UINT16) \
  36   _("uint32_t",                 UINT32) \
  37   _("uint64_t",                 UINT64) \
  38   _("intptr_t",                 INT_PSZ) \
  39   _("uintptr_t",                UINT_PSZ) \
  40   /* End of typedef list. */
  41
  42 /* Keywords (only the ones we actually care for). */
  43 #define CTKWDEF(_) \
  44   /* Type specifiers. */ \
  45   _("void",             -1,     CTOK_VOID) \
  46   _("_Bool",            1,      CTOK_BOOL) \
  47   _("bool",             1,      CTOK_BOOL) \
  48   _("char",             1,      CTOK_CHAR) \
  49   _("int",              4,      CTOK_INT) \
  50   _("__int8",           1,      CTOK_INT) \
  51   _("__int16",          2,      CTOK_INT) \
  52   _("__int32",          4,      CTOK_INT) \
  53   _("__int64",          8,      CTOK_INT) \
  54   _("float",            4,      CTOK_FP) \
  55   _("double",           8,      CTOK_FP) \
  56   _("long",             0,      CTOK_LONG) \
  57   _("short",            0,      CTOK_SHORT) \
  58   _("_Complex",         0,      CTOK_COMPLEX) \
  59   _("complex",          0,      CTOK_COMPLEX) \
  60   _("__complex",        0,      CTOK_COMPLEX) \
  61   _("__complex__",      0,      CTOK_COMPLEX) \
  62   _("signed",           0,      CTOK_SIGNED) \
  63   _("__signed",         0,      CTOK_SIGNED) \
  64   _("__signed__",       0,      CTOK_SIGNED) \
  65   _("unsigned",         0,      CTOK_UNSIGNED) \
  66   /* Type qualifiers. */ \
  67   _("const",            0,      CTOK_CONST) \
  68   _("__const",          0,      CTOK_CONST) \
  69   _("__const__",        0,      CTOK_CONST) \
  70   _("volatile",         0,      CTOK_VOLATILE) \
  71   _("__volatile",       0,      CTOK_VOLATILE) \
  72   _("__volatile__",     0,      CTOK_VOLATILE) \
  73   _("restrict",         0,      CTOK_RESTRICT) \
  74   _("__restrict",       0,      CTOK_RESTRICT) \
  75   _("__restrict__",     0,      CTOK_RESTRICT) \
  76   _("inline",           0,      CTOK_INLINE) \
  77   _("__inline",         0,      CTOK_INLINE) \
  78   _("__inline__",       0,      CTOK_INLINE) \
  79   /* Storage class specifiers. */ \
  80   _("typedef",          0,      CTOK_TYPEDEF) \
  81   _("extern",           0,      CTOK_EXTERN) \
  82   _("static",           0,      CTOK_STATIC) \
  83   _("auto",             0,      CTOK_AUTO) \
  84   _("register",         0,      CTOK_REGISTER) \
  85   /* GCC Attributes. */ \
  86   _("__extension__",    0,      CTOK_EXTENSION) \
  87   _("__attribute",      0,      CTOK_ATTRIBUTE) \
  88   _("__attribute__",    0,      CTOK_ATTRIBUTE) \
  89   _("asm",              0,      CTOK_ASM) \
  90   _("__asm",            0,      CTOK_ASM) \
  91   _("__asm__",          0,      CTOK_ASM) \
  92   /* MSVC Attributes. */ \
  93   _("__declspec",       0,      CTOK_DECLSPEC) \
  94   _("__cdecl",          CTCC_CDECL,     CTOK_CCDECL) \
  95   _("__thiscall",       CTCC_THISCALL,  CTOK_CCDECL) \
  96   _("__fastcall",       CTCC_FASTCALL,  CTOK_CCDECL) \
  97   _("__stdcall",        CTCC_STDCALL,   CTOK_CCDECL) \
  98   _("__ptr32",          4,      CTOK_PTRSZ) \
  99   _("__ptr64",          8,      CTOK_PTRSZ) \
 100   /* Other type specifiers. */ \
 101   _("struct",           0,      CTOK_STRUCT) \
 102   _("union",            0,      CTOK_UNION) \
 103   _("enum",             0,      CTOK_ENUM) \
 104   /* Operators. */ \
 105   _("sizeof",           0,      CTOK_SIZEOF) \
 106   _("__alignof",        0,      CTOK_ALIGNOF) \
 107   _("__alignof__",      0,      CTOK_ALIGNOF) \
 108   /* End of keyword list. */
 109
 110 /* Type info for predefined types. Size merged in. */
 111 static CTInfo lj_ctype_typeinfo[] = {
 112 #define CTTYINFODEF(id, sz, ct, info)   CTINFO((ct),(((sz)&0x3fu)<<10)+(info)),
 113 #define CTTDINFODEF(name, id)           CTINFO(CT_TYPEDEF, CTID_##id),
 114 #define CTKWINFODEF(name, sz, kw)       CTINFO(CT_KW,(((sz)&0x3fu)<<10)+(kw)),
 115 CTTYDEF(CTTYINFODEF)
 116 CTTDDEF(CTTDINFODEF)
 117 CTKWDEF(CTKWINFODEF)
 118 #undef CTTYINFODEF
 119 #undef CTTDINFODEF
 120 #undef CTKWINFODEF
 121   0
 122 };
 123
 124 /* Predefined type names collected in a single string. */
 125 static const char * const lj_ctype_typenames =
 126 #define CTTDNAMEDEF(name, id)           name "\0"
 127 #define CTKWNAMEDEF(name, sz, cds)      name "\0"
 128 CTTDDEF(CTTDNAMEDEF)
 129 CTKWDEF(CTKWNAMEDEF)
 130 #undef CTTDNAMEDEF
 131 #undef CTKWNAMEDEF
 132 ;
 133
 134 #define CTTYPEINFO_NUM          (sizeof(lj_ctype_typeinfo)/sizeof(CTInfo)-1)
 135 #define CTTYPETAB_MIN           128
 136
 137 /* -- C type interning ---------------------------------------------------- */
 138
 139 #define ct_hashtype(info, size) (hashrot(info, size) & CTHASH_MASK)
 140 #define ct_hashname(name) \
 141   (hashrot(u32ptr(name), u32ptr(name) + HASH_BIAS) & CTHASH_MASK)
 142
 143 /* Create new type element. */
 144 CTypeID lj_ctype_new(CTState *cts, CType **ctp)
 145 {
 146   CTypeID id = cts->top;
 147   CType *ct;
 148   lua_assert(cts->L);
 149   if (LJ_UNLIKELY(id >= cts->sizetab)) {
 150     if (id >= CTID_MAX) lj_err_msg(cts->L, LJ_ERR_TABOV);
 151     lj_mem_growvec(cts->L, cts->tab, cts->sizetab, CTID_MAX, CType);
 152   }
 153   cts->top = id+1;
 154   *ctp = ct = &cts->tab[id];
 155   ct->info = 0;
 156   ct->size = 0;
 157   ct->sib = 0;
 158   ct->next = 0;
 159   setgcrefnull(ct->name);
 160   return id;
 161 }
 162
 163 /* Intern a type element. */
 164 CTypeID lj_ctype_intern(CTState *cts, CTInfo info, CTSize size)
 165 {
 166   uint32_t h = ct_hashtype(info, size);
 167   CTypeID id = cts->hash[h];
 168   lua_assert(cts->L);
 169   while (id) {
 170     CType *ct = ctype_get(cts, id);
 171     if (ct->info == info && ct->size == size)
 172       return id;
 173     id = ct->next;
 174   }
 175   id = cts->top;
 176   if (LJ_UNLIKELY(id >= cts->sizetab)) {
 177     if (id >= CTID_MAX) lj_err_msg(cts->L, LJ_ERR_TABOV);
 178     lj_mem_growvec(cts->L, cts->tab, cts->sizetab, CTID_MAX, CType);
 179   }
 180   cts->top = id+1;
 181   cts->tab[id].info = info;
 182   cts->tab[id].size = size;
 183   cts->tab[id].sib = 0;
 184   cts->tab[id].next = cts->hash[h];
 185   setgcrefnull(cts->tab[id].name);
 186   cts->hash[h] = (CTypeID1)id;
 187   return id;
 188 }
 189
 190 /* Add type element to hash table. */
 191 static void ctype_addtype(CTState *cts, CType *ct, CTypeID id)
 192 {
 193   uint32_t h = ct_hashtype(ct->info, ct->size);
 194   ct->next = cts->hash[h];
 195   cts->hash[h] = (CTypeID1)id;
 196 }
 197
 198 /* Add named element to hash table. */
 199 void lj_ctype_addname(CTState *cts, CType *ct, CTypeID id)
 200 {
 201   uint32_t h = ct_hashname(gcref(ct->name));
 202   ct->next = cts->hash[h];
 203   cts->hash[h] = (CTypeID1)id;
 204 }
 205
 206 /* Get a C type by name, matching the type mask. */
 207 CTypeID lj_ctype_getname(CTState *cts, CType **ctp, GCstr *name, uint32_t tmask)
 208 {
 209   CTypeID id = cts->hash[ct_hashname(name)];
 210   while (id) {
 211     CType *ct = ctype_get(cts, id);
 212     if (gcref(ct->name) == obj2gco(name) &&
 213         ((tmask >> ctype_type(ct->info)) & 1)) {
 214       *ctp = ct;
 215       return id;
 216     }
 217     id = ct->next;
 218   }
 219   *ctp = &cts->tab[0];  /* Simplify caller logic. ctype_get() would assert. */
 220   return 0;
 221 }
 222
 223 /* Get a struct/union/enum/function field by name. */
 224 CType *lj_ctype_getfield(CTState *cts, CType *ct, GCstr *name, CTSize *ofs)
 225 {
 226   while (ct->sib) {
 227     ct = ctype_get(cts, ct->sib);
 228     if (gcref(ct->name) == obj2gco(name)) {
 229       *ofs = ct->size;
 230       return ct;
 231     }
 232     if (ctype_isxattrib(ct->info, CTA_SUBTYPE)) {
 233       CType *fct = lj_ctype_getfield(cts, ctype_child(cts, ct), name, ofs);
 234       if (fct) {
 235         *ofs += ct->size;
 236         return fct;
 237       }
 238     }
 239   }
 240   return NULL;  /* Not found. */
 241 }
 242
 243 /* -- C type information -------------------------------------------------- */
 244
 245 /* Follow references and get raw type for a C type ID. */
 246 CType *lj_ctype_rawref(CTState *cts, CTypeID id)
 247 {
 248   CType *ct = ctype_get(cts, id);
 249   while (ctype_isattrib(ct->info) || ctype_isref(ct->info))
 250     ct = ctype_child(cts, ct);
 251   return ct;
 252 }
 253
 254 /* Get size for a C type ID. Does NOT support VLA/VLS. */
 255 CTSize lj_ctype_size(CTState *cts, CTypeID id)
 256 {
 257   CType *ct = ctype_raw(cts, id);
 258   return ctype_hassize(ct->info) ? ct->size : CTSIZE_INVALID;
 259 }
 260
 261 /* Get size for a variable-length C type. Does NOT support other C types. */
 262 CTSize lj_ctype_vlsize(CTState *cts, CType *ct, CTSize nelem)
 263 {
 264   uint64_t xsz = 0;
 265   if (ctype_isstruct(ct->info)) {
 266     CTypeID arrid = 0, fid = ct->sib;
 267     xsz = ct->size;  /* Add the struct size. */
 268     while (fid) {
 269       CType *ctf = ctype_get(cts, fid);
 270       if (ctype_type(ctf->info) == CT_FIELD)
 271         arrid = ctype_cid(ctf->info);  /* Remember last field of VLS. */
 272       fid = ctf->sib;
 273     }
 274     ct = ctype_raw(cts, arrid);
 275   }
 276   lua_assert(ctype_isvlarray(ct->info));  /* Must be a VLA. */
 277   ct = ctype_rawchild(cts, ct);  /* Get array element. */
 278   lua_assert(ctype_hassize(ct->info));
 279   /* Calculate actual size of VLA and check for overflow. */
 280   xsz += (uint64_t)ct->size * nelem;
 281   return xsz < 0x80000000u ? (CTSize)xsz : CTSIZE_INVALID;
 282 }
 283
 284 /* Get type, qualifiers, size and alignment for a C type ID. */
 285 CTInfo lj_ctype_info(CTState *cts, CTypeID id, CTSize *szp)
 286 {
 287   CTInfo qual = 0;
 288   CType *ct = ctype_get(cts, id);
 289   for (;;) {
 290     CTInfo info = ct->info;
 291     if (ctype_isenum(info)) {
 292       /* Follow child. Need to look at its attributes, too. */
 293     } else if (ctype_isattrib(info)) {
 294       if (ctype_isxattrib(info, CTA_QUAL))
 295         qual |= ct->size;
 296       else if (ctype_isxattrib(info, CTA_ALIGN) && !(qual & CTFP_ALIGNED))
 297         qual |= CTFP_ALIGNED + CTALIGN(ct->size);
 298     } else {
 299       if (!(qual & CTFP_ALIGNED)) qual |= (info & CTF_ALIGN);
 300       qual |= (info & ~(CTF_ALIGN|CTMASK_CID));
 301       lua_assert(ctype_hassize(info) || ctype_isfunc(info));
 302       *szp = ctype_isfunc(info) ? CTSIZE_INVALID : ct->size;
 303       break;
 304     }
 305     ct = ctype_get(cts, ctype_cid(info));
 306   }
 307   return qual;
 308 }
 309
 310 /* Get ctype metamethod. */
 311 cTValue *lj_ctype_meta(CTState *cts, CTypeID id, MMS mm)
 312 {
 313   CType *ct = ctype_get(cts, id);
 314   cTValue *tv;
 315   while (ctype_isattrib(ct->info) || ctype_isref(ct->info)) {
 316     id = ctype_cid(ct->info);
 317     ct = ctype_get(cts, id);
 318   }
 319   if (ctype_isptr(ct->info) &&
 320       ctype_isfunc(ctype_get(cts, ctype_cid(ct->info))->info))
 321     tv = lj_tab_getstr(cts->miscmap, &cts->g->strempty);
 322   else
 323     tv = lj_tab_getinth(cts->miscmap, -(int32_t)id);
 324   if (tv && tvistab(tv) &&
 325       (tv = lj_tab_getstr(tabV(tv), mmname_str(cts->g, mm))) && !tvisnil(tv))
 326     return tv;
 327   return NULL;
 328 }
 329
 330 /* -- C type representation ----------------------------------------------- */
 331
 332 /* Fixed max. length of a C type representation. */
 333 #define CTREPR_MAX              512
 334
 335 typedef struct CTRepr {
 336   char *pb, *pe;
 337   CTState *cts;
 338   lua_State *L;
 339   int needsp;
 340   int ok;
 341   char buf[CTREPR_MAX];
 342 } CTRepr;
 343
 344 /* Prepend string. */
 345 static void ctype_prepstr(CTRepr *ctr, const char *str, MSize len)
 346 {
 347   char *p = ctr->pb;
 348   if (ctr->buf + len+1 > p) { ctr->ok = 0; return; }
 349   if (ctr->needsp) *--p = ' ';
 350   ctr->needsp = 1;
 351   p -= len;
 352   while (len-- > 0) p[len] = str[len];
 353   ctr->pb = p;
 354 }
 355
 356 #define ctype_preplit(ctr, str) ctype_prepstr((ctr), "" str, sizeof(str)-1)
 357
 358 /* Prepend char. */
 359 static void ctype_prepc(CTRepr *ctr, int c)
 360 {
 361   if (ctr->buf >= ctr->pb) { ctr->ok = 0; return; }
 362   *--ctr->pb = c;
 363 }
 364
 365 /* Prepend number. */
 366 static void ctype_prepnum(CTRepr *ctr, uint32_t n)
 367 {
 368   char *p = ctr->pb;
 369   if (ctr->buf + 10+1 > p) { ctr->ok = 0; return; }
 370   do { *--p = (char)('0' + n % 10); } while (n /= 10);
 371   ctr->pb = p;
 372   ctr->needsp = 0;
 373 }
 374
 375 /* Append char. */
 376 static void ctype_appc(CTRepr *ctr, int c)
 377 {
 378   if (ctr->pe >= ctr->buf + CTREPR_MAX) { ctr->ok = 0; return; }
 379   *ctr->pe++ = c;
 380 }
 381
 382 /* Append number. */
 383 static void ctype_appnum(CTRepr *ctr, uint32_t n)
 384 {
 385   char buf[10];
 386   char *p = buf+sizeof(buf);
 387   char *q = ctr->pe;
 388   if (q > ctr->buf + CTREPR_MAX - 10) { ctr->ok = 0; return; }
 389   do { *--p = (char)('0' + n % 10); } while (n /= 10);
 390   do { *q++ = *p++; } while (p < buf+sizeof(buf));
 391   ctr->pe = q;
 392 }
 393
 394 /* Prepend qualifiers. */
 395 static void ctype_prepqual(CTRepr *ctr, CTInfo info)
 396 {
 397   if ((info & CTF_VOLATILE)) ctype_preplit(ctr, "volatile");
 398   if ((info & CTF_CONST)) ctype_preplit(ctr, "const");
 399 }
 400
 401 /* Prepend named type. */
 402 static void ctype_preptype(CTRepr *ctr, CType *ct, CTInfo qual, const char *t)
 403 {
 404   if (gcref(ct->name)) {
 405     GCstr *str = gco2str(gcref(ct->name));
 406     ctype_prepstr(ctr, strdata(str), str->len);
 407   } else {
 408     if (ctr->needsp) ctype_prepc(ctr, ' ');
 409     ctype_prepnum(ctr, ctype_typeid(ctr->cts, ct));
 410     ctr->needsp = 1;
 411   }
 412   ctype_prepstr(ctr, t, (MSize)strlen(t));
 413   ctype_prepqual(ctr, qual);
 414 }
 415
 416 static void ctype_repr(CTRepr *ctr, CTypeID id)
 417 {
 418   CType *ct = ctype_get(ctr->cts, id);
 419   CTInfo qual = 0;
 420   int ptrto = 0;
 421   for (;;) {
 422     CTInfo info = ct->info;
 423     CTSize size = ct->size;
 424     switch (ctype_type(info)) {
 425     case CT_NUM:
 426       if ((info & CTF_BOOL)) {
 427         ctype_preplit(ctr, "bool");
 428       } else if ((info & CTF_FP)) {
 429         if (size == sizeof(double)) ctype_preplit(ctr, "double");
 430         else if (size == sizeof(float)) ctype_preplit(ctr, "float");
 431         else ctype_preplit(ctr, "long double");
 432       } else if (size == 1) {
 433         if (!((info ^ CTF_UCHAR) & CTF_UNSIGNED)) ctype_preplit(ctr, "char");
 434         else if (CTF_UCHAR) ctype_preplit(ctr, "signed char");
 435         else ctype_preplit(ctr, "unsigned char");
 436       } else if (size < 8) {
 437         if (size == 4) ctype_preplit(ctr, "int");
 438         else ctype_preplit(ctr, "short");
 439         if ((info & CTF_UNSIGNED)) ctype_preplit(ctr, "unsigned");
 440       } else {
 441         ctype_preplit(ctr, "_t");
 442         ctype_prepnum(ctr, size*8);
 443         ctype_preplit(ctr, "int");
 444         if ((info & CTF_UNSIGNED)) ctype_prepc(ctr, 'u');
 445       }
 446       ctype_prepqual(ctr, (qual|info));
 447       return;
 448     case CT_VOID:
 449       ctype_preplit(ctr, "void");
 450       ctype_prepqual(ctr, (qual|info));
 451       return;
 452     case CT_STRUCT:
 453       ctype_preptype(ctr, ct, qual, (info & CTF_UNION) ? "union" : "struct");
 454       return;
 455     case CT_ENUM:
 456       ctype_preptype(ctr, ct, qual, "enum");
 457       return;
 458     case CT_ATTRIB:
 459       if (ctype_attrib(info) == CTA_QUAL) qual |= size;
 460       break;
 461     case CT_PTR:
 462       if ((info & CTF_REF)) {
 463         ctype_prepc(ctr, '&');
 464       } else {
 465         ctype_prepqual(ctr, (qual|info));
 466         if (LJ_64 && size == 4) ctype_preplit(ctr, "__ptr32");
 467         ctype_prepc(ctr, '*');
 468       }
 469       qual = 0;
 470       ptrto = 1;
 471       ctr->needsp = 1;
 472       break;
 473     case CT_ARRAY:
 474       if (ctype_isrefarray(info)) {
 475         ctr->needsp = 1;
 476         if (ptrto) { ptrto = 0; ctype_prepc(ctr, '('); ctype_appc(ctr, ')'); }
 477         ctype_appc(ctr, '[');
 478         if (size != CTSIZE_INVALID) {
 479           CTSize csize = ctype_child(ctr->cts, ct)->size;
 480           ctype_appnum(ctr, csize ? size/csize : 0);
 481         } else if ((info & CTF_VLA)) {
 482           ctype_appc(ctr, '?');
 483         }
 484         ctype_appc(ctr, ']');
 485       } else if ((info & CTF_COMPLEX)) {
 486         if (size == 2*sizeof(float)) ctype_preplit(ctr, "float");
 487         ctype_preplit(ctr, "complex");
 488         return;
 489       } else {
 490         ctype_preplit(ctr, ")))");
 491         ctype_prepnum(ctr, size);
 492         ctype_preplit(ctr, "__attribute__((vector_size(");
 493       }
 494       break;
 495     case CT_FUNC:
 496       ctr->needsp = 1;
 497       if (ptrto) { ptrto = 0; ctype_prepc(ctr, '('); ctype_appc(ctr, ')'); }
 498       ctype_appc(ctr, '(');
 499       ctype_appc(ctr, ')');
 500       break;
 501     default:
 502       lua_assert(0);
 503       break;
 504     }
 505     ct = ctype_get(ctr->cts, ctype_cid(info));
 506   }
 507 }
 508
 509 /* Return a printable representation of a C type. */
 510 GCstr *lj_ctype_repr(lua_State *L, CTypeID id, GCstr *name)
 511 {
 512   global_State *g = G(L);
 513   CTRepr ctr;
 514   ctr.pb = ctr.pe = &ctr.buf[CTREPR_MAX/2];
 515   ctr.cts = ctype_ctsG(g);
 516   ctr.L = L;
 517   ctr.ok = 1;
 518   ctr.needsp = 0;
 519   if (name) ctype_prepstr(&ctr, strdata(name), name->len);
 520   ctype_repr(&ctr, id);
 521   if (LJ_UNLIKELY(!ctr.ok)) return lj_str_newlit(L, "?");
 522   return lj_str_new(L, ctr.pb, ctr.pe - ctr.pb);
 523 }
 524
 525 /* Convert int64_t/uint64_t to string with 'LL' or 'ULL' suffix. */
 526 GCstr *lj_ctype_repr_int64(lua_State *L, uint64_t n, int isunsigned)
 527 {
 528   char buf[1+20+3];
 529   char *p = buf+sizeof(buf);
 530   int sign = 0;
 531   *--p = 'L'; *--p = 'L';
 532   if (isunsigned) {
 533     *--p = 'U';
 534   } else if ((int64_t)n < 0) {
 535     n = (uint64_t)-(int64_t)n;
 536     sign = 1;
 537   }
 538   do { *--p = (char)('0' + n % 10); } while (n /= 10);
 539   if (sign) *--p = '-';
 540   return lj_str_new(L, p, (size_t)(buf+sizeof(buf)-p));
 541 }
 542
 543 /* Convert complex to string with 'i' or 'I' suffix. */
 544 GCstr *lj_ctype_repr_complex(lua_State *L, void *sp, CTSize size)
 545 {
 546   char buf[2*LJ_STR_NUMBUF+2+1];
 547   TValue re, im;
 548   size_t len;
 549   if (size == 2*sizeof(double)) {
 550     re.n = *(double *)sp; im.n = ((double *)sp)[1];
 551   } else {
 552     re.n = (double)*(float *)sp; im.n = (double)((float *)sp)[1];
 553   }
 554   len = lj_str_bufnum(buf, &re);
 555   if (!(im.u32.hi & 0x80000000u) || im.n != im.n) buf[len++] = '+';
 556   len += lj_str_bufnum(buf+len, &im);
 557   buf[len] = buf[len-1] >= 'a' ? 'I' : 'i';
 558   return lj_str_new(L, buf, len+1);
 559 }
 560
 561 /* -- C type state -------------------------------------------------------- */
 562
 563 /* Initialize C type table and state. */
 564 CTState *lj_ctype_init(lua_State *L)
 565 {
 566   CTState *cts = lj_mem_newt(L, sizeof(CTState), CTState);
 567   CType *ct = lj_mem_newvec(L, CTTYPETAB_MIN, CType);
 568   const char *name = lj_ctype_typenames;
 569   CTypeID id;
 570   memset(cts, 0, sizeof(CTState));
 571   cts->tab = ct;
 572   cts->sizetab = CTTYPETAB_MIN;
 573   cts->top = CTTYPEINFO_NUM;
 574   cts->L = NULL;
 575   cts->g = G(L);
 576   for (id = 0; id < CTTYPEINFO_NUM; id++, ct++) {
 577     CTInfo info = lj_ctype_typeinfo[id];
 578     ct->size = (CTSize)((int32_t)(info << 16) >> 26);
 579     ct->info = info & 0xffff03ffu;
 580     if (ctype_type(info) == CT_KW || ctype_istypedef(info)) {
 581       size_t len = strlen(name);
 582       GCstr *str = lj_str_new(L, name, len);
 583       ctype_setname(ct, str);
 584       name += len+1;
 585       lj_ctype_addname(cts, ct, id);
 586     } else {
 587       setgcrefnull(ct->name);
 588       if (!ctype_isenum(info)) ctype_addtype(cts, ct, id);
 589     }
 590   }
 591   setmref(G(L)->ctype_state, cts);
 592   return cts;
 593 }
 594
 595 /* Free C type table and state. */
 596 void lj_ctype_freestate(global_State *g)
 597 {
 598   CTState *cts = ctype_ctsG(g);
 599   if (cts) {
 600     lj_ccallback_mcode_free(cts);
 601     lj_mem_freevec(g, cts->tab, cts->sizetab, CType);
 602     lj_mem_freevec(g, cts->cb.cbid, cts->cb.sizeid, CTypeID1);
 603     lj_mem_freet(g, cts);
 604   }
 605 }
 606
 607 #endif