src/lj_ctype.c

   1 /*
   2 ** C type management.
   3 ** Copyright (C) 2005-2022 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",            0,      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 #ifdef LUAJIT_CTYPE_CHECK_ANCHOR
 136 #define CTTYPETAB_MIN           CTTYPEINFO_NUM
 137 #else
 138 #define CTTYPETAB_MIN           128
 139 #endif
 140
 141 /* -- C type interning ---------------------------------------------------- */
 142
 143 #define ct_hashtype(info, size) (hashrot(info, size) & CTHASH_MASK)
 144 #define ct_hashname(name) \
 145   (hashrot(u32ptr(name), u32ptr(name) + HASH_BIAS) & CTHASH_MASK)
 146
 147 /* Create new type element. */
 148 CTypeID lj_ctype_new(CTState *cts, CType **ctp)
 149 {
 150   CTypeID id = cts->top;
 151   CType *ct;
 152   lua_assert(cts->L);
 153   if (LJ_UNLIKELY(id >= cts->sizetab)) {
 154     if (id >= CTID_MAX) lj_err_msg(cts->L, LJ_ERR_TABOV);
 155 #ifdef LUAJIT_CTYPE_CHECK_ANCHOR
 156     ct = lj_mem_newvec(cts->L, id+1, CType);
 157     memcpy(ct, cts->tab, id*sizeof(CType));
 158     memset(cts->tab, 0, id*sizeof(CType));
 159     lj_mem_freevec(cts->g, cts->tab, cts->sizetab, CType);
 160     cts->tab = ct;
 161     cts->sizetab = id+1;
 162 #else
 163     lj_mem_growvec(cts->L, cts->tab, cts->sizetab, CTID_MAX, CType);
 164 #endif
 165   }
 166   cts->top = id+1;
 167   *ctp = ct = &cts->tab[id];
 168   ct->info = 0;
 169   ct->size = 0;
 170   ct->sib = 0;
 171   ct->next = 0;
 172   setgcrefnull(ct->name);
 173   return id;
 174 }
 175
 176 /* Intern a type element. */
 177 CTypeID lj_ctype_intern(CTState *cts, CTInfo info, CTSize size)
 178 {
 179   uint32_t h = ct_hashtype(info, size);
 180   CTypeID id = cts->hash[h];
 181   lua_assert(cts->L);
 182   while (id) {
 183     CType *ct = ctype_get(cts, id);
 184     if (ct->info == info && ct->size == size)
 185       return id;
 186     id = ct->next;
 187   }
 188   id = cts->top;
 189   if (LJ_UNLIKELY(id >= cts->sizetab)) {
 190     if (id >= CTID_MAX) lj_err_msg(cts->L, LJ_ERR_TABOV);
 191     lj_mem_growvec(cts->L, cts->tab, cts->sizetab, CTID_MAX, CType);
 192   }
 193   cts->top = id+1;
 194   cts->tab[id].info = info;
 195   cts->tab[id].size = size;
 196   cts->tab[id].sib = 0;
 197   cts->tab[id].next = cts->hash[h];
 198   setgcrefnull(cts->tab[id].name);
 199   cts->hash[h] = (CTypeID1)id;
 200   return id;
 201 }
 202
 203 /* Add type element to hash table. */
 204 static void ctype_addtype(CTState *cts, CType *ct, CTypeID id)
 205 {
 206   uint32_t h = ct_hashtype(ct->info, ct->size);
 207   ct->next = cts->hash[h];
 208   cts->hash[h] = (CTypeID1)id;
 209 }
 210
 211 /* Add named element to hash table. */
 212 void lj_ctype_addname(CTState *cts, CType *ct, CTypeID id)
 213 {
 214   uint32_t h = ct_hashname(gcref(ct->name));
 215   ct->next = cts->hash[h];
 216   cts->hash[h] = (CTypeID1)id;
 217 }
 218
 219 /* Get a C type by name, matching the type mask. */
 220 CTypeID lj_ctype_getname(CTState *cts, CType **ctp, GCstr *name, uint32_t tmask)
 221 {
 222   CTypeID id = cts->hash[ct_hashname(name)];
 223   while (id) {
 224     CType *ct = ctype_get(cts, id);
 225     if (gcref(ct->name) == obj2gco(name) &&
 226         ((tmask >> ctype_type(ct->info)) & 1)) {
 227       *ctp = ct;
 228       return id;
 229     }
 230     id = ct->next;
 231   }
 232   *ctp = &cts->tab[0];  /* Simplify caller logic. ctype_get() would assert. */
 233   return 0;
 234 }
 235
 236 /* Get a struct/union/enum/function field by name. */
 237 CType *lj_ctype_getfieldq(CTState *cts, CType *ct, GCstr *name, CTSize *ofs,
 238                           CTInfo *qual)
 239 {
 240   while (ct->sib) {
 241     ct = ctype_get(cts, ct->sib);
 242     if (gcref(ct->name) == obj2gco(name)) {
 243       *ofs = ct->size;
 244       return ct;
 245     }
 246     if (ctype_isxattrib(ct->info, CTA_SUBTYPE)) {
 247       CType *fct, *cct = ctype_child(cts, ct);
 248       CTInfo q = 0;
 249       while (ctype_isattrib(cct->info)) {
 250         if (ctype_attrib(cct->info) == CTA_QUAL) q |= cct->size;
 251         cct = ctype_child(cts, cct);
 252       }
 253       fct = lj_ctype_getfieldq(cts, cct, name, ofs, qual);
 254       if (fct) {
 255         if (qual) *qual |= q;
 256         *ofs += ct->size;
 257         return fct;
 258       }
 259     }
 260   }
 261   return NULL;  /* Not found. */
 262 }
 263
 264 /* -- C type information -------------------------------------------------- */
 265
 266 /* Follow references and get raw type for a C type ID. */
 267 CType *lj_ctype_rawref(CTState *cts, CTypeID id)
 268 {
 269   CType *ct = ctype_get(cts, id);
 270   while (ctype_isattrib(ct->info) || ctype_isref(ct->info))
 271     ct = ctype_child(cts, ct);
 272   return ct;
 273 }
 274
 275 /* Get size for a C type ID. Does NOT support VLA/VLS. */
 276 CTSize lj_ctype_size(CTState *cts, CTypeID id)
 277 {
 278   CType *ct = ctype_raw(cts, id);
 279   return ctype_hassize(ct->info) ? ct->size : CTSIZE_INVALID;
 280 }
 281
 282 /* Get size for a variable-length C type. Does NOT support other C types. */
 283 CTSize lj_ctype_vlsize(CTState *cts, CType *ct, CTSize nelem)
 284 {
 285   uint64_t xsz = 0;
 286   if (ctype_isstruct(ct->info)) {
 287     CTypeID arrid = 0, fid = ct->sib;
 288     xsz = ct->size;  /* Add the struct size. */
 289     while (fid) {
 290       CType *ctf = ctype_get(cts, fid);
 291       if (ctype_type(ctf->info) == CT_FIELD)
 292         arrid = ctype_cid(ctf->info);  /* Remember last field of VLS. */
 293       fid = ctf->sib;
 294     }
 295     ct = ctype_raw(cts, arrid);
 296   }
 297   lua_assert(ctype_isvlarray(ct->info));  /* Must be a VLA. */
 298   ct = ctype_rawchild(cts, ct);  /* Get array element. */
 299   lua_assert(ctype_hassize(ct->info));
 300   /* Calculate actual size of VLA and check for overflow. */
 301   xsz += (uint64_t)ct->size * nelem;
 302   return xsz < 0x80000000u ? (CTSize)xsz : CTSIZE_INVALID;
 303 }
 304
 305 /* Get type, qualifiers, size and alignment for a C type ID. */
 306 CTInfo lj_ctype_info(CTState *cts, CTypeID id, CTSize *szp)
 307 {
 308   CTInfo qual = 0;
 309   CType *ct = ctype_get(cts, id);
 310   for (;;) {
 311     CTInfo info = ct->info;
 312     if (ctype_isenum(info)) {
 313       /* Follow child. Need to look at its attributes, too. */
 314     } else if (ctype_isattrib(info)) {
 315       if (ctype_isxattrib(info, CTA_QUAL))
 316         qual |= ct->size;
 317       else if (ctype_isxattrib(info, CTA_ALIGN) && !(qual & CTFP_ALIGNED))
 318         qual |= CTFP_ALIGNED + CTALIGN(ct->size);
 319     } else {
 320       if (!(qual & CTFP_ALIGNED)) qual |= (info & CTF_ALIGN);
 321       qual |= (info & ~(CTF_ALIGN|CTMASK_CID));
 322       lua_assert(ctype_hassize(info) || ctype_isfunc(info));
 323       *szp = ctype_isfunc(info) ? CTSIZE_INVALID : ct->size;
 324       break;
 325     }
 326     ct = ctype_get(cts, ctype_cid(info));
 327   }
 328   return qual;
 329 }
 330
 331 /* Ditto, but follow a reference. */
 332 CTInfo lj_ctype_info_raw(CTState *cts, CTypeID id, CTSize *szp)
 333 {
 334   CType *ct = ctype_get(cts, id);
 335   if (ctype_isref(ct->info)) id = ctype_cid(ct->info);
 336   return lj_ctype_info(cts, id, szp);
 337 }
 338
 339 /* Get ctype metamethod. */
 340 cTValue *lj_ctype_meta(CTState *cts, CTypeID id, MMS mm)
 341 {
 342   CType *ct = ctype_get(cts, id);
 343   cTValue *tv;
 344   while (ctype_isattrib(ct->info) || ctype_isref(ct->info)) {
 345     id = ctype_cid(ct->info);
 346     ct = ctype_get(cts, id);
 347   }
 348   if (ctype_isptr(ct->info) &&
 349       ctype_isfunc(ctype_get(cts, ctype_cid(ct->info))->info))
 350     tv = lj_tab_getstr(cts->miscmap, &cts->g->strempty);
 351   else
 352     tv = lj_tab_getinth(cts->miscmap, -(int32_t)id);
 353   if (tv && tvistab(tv) &&
 354       (tv = lj_tab_getstr(tabV(tv), mmname_str(cts->g, mm))) && !tvisnil(tv))
 355     return tv;
 356   return NULL;
 357 }
 358
 359 /* -- C type representation ----------------------------------------------- */
 360
 361 /* Fixed max. length of a C type representation. */
 362 #define CTREPR_MAX              512
 363
 364 typedef struct CTRepr {
 365   char *pb, *pe;
 366   CTState *cts;
 367   lua_State *L;
 368   int needsp;
 369   int ok;
 370   char buf[CTREPR_MAX];
 371 } CTRepr;
 372
 373 /* Prepend string. */
 374 static void ctype_prepstr(CTRepr *ctr, const char *str, MSize len)
 375 {
 376   char *p = ctr->pb;
 377   if (ctr->buf + len+1 > p) { ctr->ok = 0; return; }
 378   if (ctr->needsp) *--p = ' ';
 379   ctr->needsp = 1;
 380   p -= len;
 381   while (len-- > 0) p[len] = str[len];
 382   ctr->pb = p;
 383 }
 384
 385 #define ctype_preplit(ctr, str) ctype_prepstr((ctr), "" str, sizeof(str)-1)
 386
 387 /* Prepend char. */
 388 static void ctype_prepc(CTRepr *ctr, int c)
 389 {
 390   if (ctr->buf >= ctr->pb) { ctr->ok = 0; return; }
 391   *--ctr->pb = c;
 392 }
 393
 394 /* Prepend number. */
 395 static void ctype_prepnum(CTRepr *ctr, uint32_t n)
 396 {
 397   char *p = ctr->pb;
 398   if (ctr->buf + 10+1 > p) { ctr->ok = 0; return; }
 399   do { *--p = (char)('0' + n % 10); } while (n /= 10);
 400   ctr->pb = p;
 401   ctr->needsp = 0;
 402 }
 403
 404 /* Append char. */
 405 static void ctype_appc(CTRepr *ctr, int c)
 406 {
 407   if (ctr->pe >= ctr->buf + CTREPR_MAX) { ctr->ok = 0; return; }
 408   *ctr->pe++ = c;
 409 }
 410
 411 /* Append number. */
 412 static void ctype_appnum(CTRepr *ctr, uint32_t n)
 413 {
 414   char buf[10];
 415   char *p = buf+sizeof(buf);
 416   char *q = ctr->pe;
 417   if (q > ctr->buf + CTREPR_MAX - 10) { ctr->ok = 0; return; }
 418   do { *--p = (char)('0' + n % 10); } while (n /= 10);
 419   do { *q++ = *p++; } while (p < buf+sizeof(buf));
 420   ctr->pe = q;
 421 }
 422
 423 /* Prepend qualifiers. */
 424 static void ctype_prepqual(CTRepr *ctr, CTInfo info)
 425 {
 426   if ((info & CTF_VOLATILE)) ctype_preplit(ctr, "volatile");
 427   if ((info & CTF_CONST)) ctype_preplit(ctr, "const");
 428 }
 429
 430 /* Prepend named type. */
 431 static void ctype_preptype(CTRepr *ctr, CType *ct, CTInfo qual, const char *t)
 432 {
 433   if (gcref(ct->name)) {
 434     GCstr *str = gco2str(gcref(ct->name));
 435     ctype_prepstr(ctr, strdata(str), str->len);
 436   } else {
 437     if (ctr->needsp) ctype_prepc(ctr, ' ');
 438     ctype_prepnum(ctr, ctype_typeid(ctr->cts, ct));
 439     ctr->needsp = 1;
 440   }
 441   ctype_prepstr(ctr, t, (MSize)strlen(t));
 442   ctype_prepqual(ctr, qual);
 443 }
 444
 445 static void ctype_repr(CTRepr *ctr, CTypeID id)
 446 {
 447   CType *ct = ctype_get(ctr->cts, id);
 448   CTInfo qual = 0;
 449   int ptrto = 0;
 450   for (;;) {
 451     CTInfo info = ct->info;
 452     CTSize size = ct->size;
 453     switch (ctype_type(info)) {
 454     case CT_NUM:
 455       if ((info & CTF_BOOL)) {
 456         ctype_preplit(ctr, "bool");
 457       } else if ((info & CTF_FP)) {
 458         if (size == sizeof(double)) ctype_preplit(ctr, "double");
 459         else if (size == sizeof(float)) ctype_preplit(ctr, "float");
 460         else ctype_preplit(ctr, "long double");
 461       } else if (size == 1) {
 462         if (!((info ^ CTF_UCHAR) & CTF_UNSIGNED)) ctype_preplit(ctr, "char");
 463         else if (CTF_UCHAR) ctype_preplit(ctr, "signed char");
 464         else ctype_preplit(ctr, "unsigned char");
 465       } else if (size < 8) {
 466         if (size == 4) ctype_preplit(ctr, "int");
 467         else ctype_preplit(ctr, "short");
 468         if ((info & CTF_UNSIGNED)) ctype_preplit(ctr, "unsigned");
 469       } else {
 470         ctype_preplit(ctr, "_t");
 471         ctype_prepnum(ctr, size*8);
 472         ctype_preplit(ctr, "int");
 473         if ((info & CTF_UNSIGNED)) ctype_prepc(ctr, 'u');
 474       }
 475       ctype_prepqual(ctr, (qual|info));
 476       return;
 477     case CT_VOID:
 478       ctype_preplit(ctr, "void");
 479       ctype_prepqual(ctr, (qual|info));
 480       return;
 481     case CT_STRUCT:
 482       ctype_preptype(ctr, ct, qual, (info & CTF_UNION) ? "union" : "struct");
 483       return;
 484     case CT_ENUM:
 485       if (id == CTID_CTYPEID) {
 486         ctype_preplit(ctr, "ctype");
 487         return;
 488       }
 489       ctype_preptype(ctr, ct, qual, "enum");
 490       return;
 491     case CT_ATTRIB:
 492       if (ctype_attrib(info) == CTA_QUAL) qual |= size;
 493       break;
 494     case CT_PTR:
 495       if ((info & CTF_REF)) {
 496         ctype_prepc(ctr, '&');
 497       } else {
 498         ctype_prepqual(ctr, (qual|info));
 499         if (LJ_64 && size == 4) ctype_preplit(ctr, "__ptr32");
 500         ctype_prepc(ctr, '*');
 501       }
 502       qual = 0;
 503       ptrto = 1;
 504       ctr->needsp = 1;
 505       break;
 506     case CT_ARRAY:
 507       if (ctype_isrefarray(info)) {
 508         ctr->needsp = 1;
 509         if (ptrto) { ptrto = 0; ctype_prepc(ctr, '('); ctype_appc(ctr, ')'); }
 510         ctype_appc(ctr, '[');
 511         if (size != CTSIZE_INVALID) {
 512           CTSize csize = ctype_child(ctr->cts, ct)->size;
 513           ctype_appnum(ctr, csize ? size/csize : 0);
 514         } else if ((info & CTF_VLA)) {
 515           ctype_appc(ctr, '?');
 516         }
 517         ctype_appc(ctr, ']');
 518       } else if ((info & CTF_COMPLEX)) {
 519         if (size == 2*sizeof(float)) ctype_preplit(ctr, "float");
 520         ctype_preplit(ctr, "complex");
 521         return;
 522       } else {
 523         ctype_preplit(ctr, ")))");
 524         ctype_prepnum(ctr, size);
 525         ctype_preplit(ctr, "__attribute__((vector_size(");
 526       }
 527       break;
 528     case CT_FUNC:
 529       ctr->needsp = 1;
 530       if (ptrto) { ptrto = 0; ctype_prepc(ctr, '('); ctype_appc(ctr, ')'); }
 531       ctype_appc(ctr, '(');
 532       ctype_appc(ctr, ')');
 533       break;
 534     default:
 535       lua_assert(0);
 536       break;
 537     }
 538     ct = ctype_get(ctr->cts, ctype_cid(info));
 539   }
 540 }
 541
 542 /* Return a printable representation of a C type. */
 543 GCstr *lj_ctype_repr(lua_State *L, CTypeID id, GCstr *name)
 544 {
 545   global_State *g = G(L);
 546   CTRepr ctr;
 547   ctr.pb = ctr.pe = &ctr.buf[CTREPR_MAX/2];
 548   ctr.cts = ctype_ctsG(g);
 549   ctr.L = L;
 550   ctr.ok = 1;
 551   ctr.needsp = 0;
 552   if (name) ctype_prepstr(&ctr, strdata(name), name->len);
 553   ctype_repr(&ctr, id);
 554   if (LJ_UNLIKELY(!ctr.ok)) return lj_str_newlit(L, "?");
 555   return lj_str_new(L, ctr.pb, ctr.pe - ctr.pb);
 556 }
 557
 558 /* Convert int64_t/uint64_t to string with 'LL' or 'ULL' suffix. */
 559 GCstr *lj_ctype_repr_int64(lua_State *L, uint64_t n, int isunsigned)
 560 {
 561   char buf[1+20+3];
 562   char *p = buf+sizeof(buf);
 563   int sign = 0;
 564   *--p = 'L'; *--p = 'L';
 565   if (isunsigned) {
 566     *--p = 'U';
 567   } else if ((int64_t)n < 0) {
 568     n = (uint64_t)-(int64_t)n;
 569     sign = 1;
 570   }
 571   do { *--p = (char)('0' + n % 10); } while (n /= 10);
 572   if (sign) *--p = '-';
 573   return lj_str_new(L, p, (size_t)(buf+sizeof(buf)-p));
 574 }
 575
 576 /* Convert complex to string with 'i' or 'I' suffix. */
 577 GCstr *lj_ctype_repr_complex(lua_State *L, void *sp, CTSize size)
 578 {
 579   char buf[2*LJ_STR_NUMBUF+2+1];
 580   TValue re, im;
 581   size_t len;
 582   if (size == 2*sizeof(double)) {
 583     re.n = *(double *)sp; im.n = ((double *)sp)[1];
 584   } else {
 585     re.n = (double)*(float *)sp; im.n = (double)((float *)sp)[1];
 586   }
 587   len = lj_str_bufnum(buf, &re);
 588   if (!(im.u32.hi & 0x80000000u) || im.n != im.n) buf[len++] = '+';
 589   len += lj_str_bufnum(buf+len, &im);
 590   buf[len] = buf[len-1] >= 'a' ? 'I' : 'i';
 591   return lj_str_new(L, buf, len+1);
 592 }
 593
 594 /* -- C type state -------------------------------------------------------- */
 595
 596 /* Initialize C type table and state. */
 597 CTState *lj_ctype_init(lua_State *L)
 598 {
 599   CTState *cts = lj_mem_newt(L, sizeof(CTState), CTState);
 600   CType *ct = lj_mem_newvec(L, CTTYPETAB_MIN, CType);
 601   const char *name = lj_ctype_typenames;
 602   CTypeID id;
 603   memset(cts, 0, sizeof(CTState));
 604   cts->tab = ct;
 605   cts->sizetab = CTTYPETAB_MIN;
 606   cts->top = CTTYPEINFO_NUM;
 607   cts->L = NULL;
 608   cts->g = G(L);
 609   for (id = 0; id < CTTYPEINFO_NUM; id++, ct++) {
 610     CTInfo info = lj_ctype_typeinfo[id];
 611     ct->size = (CTSize)((int32_t)(info << 16) >> 26);
 612     ct->info = info & 0xffff03ffu;
 613     ct->sib = 0;
 614     if (ctype_type(info) == CT_KW || ctype_istypedef(info)) {
 615       size_t len = strlen(name);
 616       GCstr *str = lj_str_new(L, name, len);
 617       ctype_setname(ct, str);
 618       name += len+1;
 619       lj_ctype_addname(cts, ct, id);
 620     } else {
 621       setgcrefnull(ct->name);
 622       ct->next = 0;
 623       if (!ctype_isenum(info)) ctype_addtype(cts, ct, id);
 624     }
 625   }
 626   setmref(G(L)->ctype_state, cts);
 627   return cts;
 628 }
 629
 630 /* Free C type table and state. */
 631 void lj_ctype_freestate(global_State *g)
 632 {
 633   CTState *cts = ctype_ctsG(g);
 634   if (cts) {
 635     lj_ccallback_mcode_free(cts);
 636     lj_mem_freevec(g, cts->tab, cts->sizetab, CType);
 637     lj_mem_freevec(g, cts->cb.cbid, cts->cb.sizeid, CTypeID1);
 638     lj_mem_freet(g, cts);
 639   }
 640 }
 641
 642 #endif