REFACTOR: move sources to src/

1 files changed, 0 insertions, 2496 deletions

diff --git a/c/lex.c b/c/lex.c
deleted file mode 100644
index c196a21..0000000
--- a/c/lex.c
+++ /dev/null
@@ -1,2496 +0,0 @@
-#include "lex.h"
-#include "../version.h"
-#include <string.h>
-#include <stdlib.h>
-
-/* fill internal circular character buffer with input after translation phase 1 & 2
- * (trigraph substitution and backslash-newline deletion */
-static void
-fillchrbuf(struct lexer *lx)
-{
-   const uchar *p = lx->dat + lx->idx;
-   int i = lx->chrbuf0, idx = lx->idx;
-   int rem = countof(lx->chrbuf) - i;
-   assert(rem >= 0);
-   if (rem > 0) {
-      memmove(lx->chrbuf, lx->chrbuf+i, rem * sizeof *lx->chrbuf);
-      memmove(lx->chridxbuf, lx->chridxbuf+i, rem * sizeof *lx->chridxbuf);
-   }
-   lx->chrbuf0 = 0;
-   i = rem;
-
-   for (; i < countof(lx->chrbuf); ++i) {
-      uchar c;
-      /* skip backslash-newline* */
-      for (;;) {
-         if (p[0] == '\\') {
-            if (p[1] == '\n') {
-               idx += 2;
-               p += 2;
-            } else if (p[1] == '\r' && p[2] == '\n') {
-               idx += 3;
-               p += 3;
-            } else break;
-         } else if (ccopt.trigraph && !memcmp(p, "\?\?/\n", 4)) {
-            idx += 4;
-            p += 4;
-         } else if (ccopt.trigraph && !memcmp(p, "\?\?/\r\n", 5)) {
-            idx += 5;
-            p += 5;
-         } else break;
-         addfileline(lx->fileid, idx);
-      }
-
-      if (idx >= lx->ndat) {
-         c = 0;
-      } else if (ccopt.trigraph && ((p[0] == '?') & (p[1] == '?'))) {
-         switch (p[2]) {
-         case '=':  c = '#'; break;
-         case '(':  c = '['; break;
-         case ')':  c = ']'; break;
-         case '!':  c = '|'; break;
-         case '<':  c = '{'; break;
-         case '>':  c = '}'; break;
-         case '-':  c = '~'; break;
-         case '/':  c = '\\'; break;
-         case '\'': c = '^'; break;
-         default: goto NoTrigraph;
-         }
-         p += 3;
-         idx += 3;
-      } else {
-      NoTrigraph:
-         ++idx;
-         if ((c = *p++) == '\n')
-            addfileline(lx->fileid, idx);
-      }
-      lx->chrbuf[i] = c;
-      lx->chridxbuf[i] = idx;
-   }
-   lx->idx = idx;
-}
-
-static uchar
-next(struct lexer *lx)
-{
-   if (lx->chrbuf0 >= countof(lx->chrbuf))
-      fillchrbuf(lx);
-   lx->chridx = lx->chridxbuf[lx->chrbuf0];
-   uchar c = lx->chrbuf[lx->chrbuf0];
-   lx->eof = lx->chridx >= lx->ndat;
-   ++lx->chrbuf0;
-   return c;
-}
-
-static uchar
-peek(struct lexer *lx, int off)
-{
-   assert(off < countof(lx->chrbuf));
-   if (lx->chrbuf0 + off >= countof(lx->chrbuf))
-      fillchrbuf(lx);
-   return lx->chrbuf[lx->chrbuf0 + off];
-}
-
-static bool
-match(struct lexer *lx, uchar c)
-{
-   if (!lx->eof && peek(lx, 0) == c) {
-      next(lx);
-      return 1;
-   }
-   return 0;
-}
-
-static bool
-aissep(int c) {
-   static const bool tab[] = {
-      ['('] = 1, [')'] = 1, ['['] = 1, [']'] = 1,
-      ['{'] = 1, ['}'] = 1, ['.'] = 1, [','] = 1,
-      [';'] = 1, ['?'] = 1, ['+'] = 1, ['-'] = 1,
-      ['*'] = 1, ['/'] = 1, ['&'] = 1, ['|'] = 1,
-      ['^'] = 1, ['~'] = 1, ['='] = 1, ['\''] = 1,
-      ['"'] = 1, ['<'] = 1, ['>'] = 1, [':'] = 1,
-      ['@'] = 1, ['#'] = 1, ['%'] = 1, ['\\'] = 1,
-      ['`'] = 1, ['!'] = 1,
-   };
-   if (!aisprint(c) || aisspace(c))
-      return 1;
-   return (uint)c < sizeof(tab) && tab[c];
-}
-
-enum typetag
-parsenumlit(uvlong *outi, double *outf, const struct token *tk, bool ispp)
-{
-   if (tk->t == TKCHRLIT) {
-      uvlong n = 0;
-      if (!tk->wide) {
-         for (int i = 0; i < tk->len; ++i)
-            n = n << 8 | (uchar)tk->s[i];
-      } else if (tk->wide == 1) {
-         n = tk->ws16[0];
-      } else {
-         assert(tk->wide == 2);
-         n = tk->ws32[0];
-      }
-      if (outi) *outi = n;
-      return TYINT;
-   } else if (memchr(tk->s, '.', tk->len)) {
-      extern double strtod(const char *, char **);
-      double f;
-      char buf[80], *suffix;
-   Float: /* float literal */
-      assert(tk->len < sizeof buf - 1 && "numlit too big");
-      memcpy(buf, tk->s, tk->len);
-      buf[tk->len] = 0;
-      f = strtod(buf, &suffix);
-      if (suffix == buf)
-         return 0;
-      if (!*suffix) {
-         if (outf) *outf = f;
-         return TYDOUBLE;
-      } else if ((suffix[0]|0x20) == 'f' && !suffix[1]) {
-         if (outf) *outf = f;
-         return TYFLOAT;
-      } else if ((suffix[0]|0x20) == 'l' && !suffix[1]) {
-         if (outf) *outf = f;
-         return TYLDOUBLE;
-      }
-      return 0;
-   } else { /* int literal */
-      static uvlong max4typ[TYUVLONG-TYINT+1];
-      uvlong n = 0;
-      int base = 10, nsx;
-      bool dec, u = 0, longlongok = ccopt.cstd >= STDC99 || !ccopt.pedant;
-      enum typetag ty = 0;
-      const char *sx; /*suffix*/
-      char c;
-
-      if (!max4typ[0])
-         for (ty = TYINT; ty <= TYUVLONG; ++ty)
-            max4typ[ty-TYINT] = ((1ull << (8*targ_primsizes[ty]-1))-1) << isunsignedt(ty) | 1;
-
-      sx = tk->s;
-      if (tk->len > 2 && sx[0] == '0') {
-         if ((sx[1]|32) == 'x') sx += 2, base = 16; /* 0x.. */
-         else if ((sx[1]|32) == 'b') sx += 2, base = 2; /* 0b.. */
-         else base = 8; /* 0.. */
-      }
-      for (; sx < tk->s + tk->len; ++sx) {
-         if (base < 16) {
-            if (!in_range(c = *sx, '0', '0'+base-1)) break;
-            n = n*base + c - '0';
-         } else {
-            if (in_range(c = *sx, '0', '9')) n = n*base + c - '0';
-            else if (in_range(c|32, 'a', 'f')) n = n*base + 0xa + (c|32) - 'a';
-            else break;
-         }
-      }
-      dec = base == 10;
-      nsx = tk->len - (sx - tk->s);
-
-      if (nsx == 0) /* '' */ {}
-      else if ((sx[0]|32) == 'u') {
-         u = 1;
-         if (nsx == 1) /* 'u' */ {}
-         else if ((sx[1]|32) == 'l') {
-            if (nsx == 2) /* 'ul' */ goto L;
-            if (sx[1] == sx[2] && nsx == 3) /* 'ull' */ goto LL;
-            return 0;
-         } else return 0;
-      } else if ((sx[0]|32) == 'l') {
-         if (nsx == 1) /* 'l' */ goto L;
-         if ((sx[1]|32) == 'u' && nsx == 2) /* 'lu' */ { u=1; goto L; }
-         if (sx[1] == sx[0]) {
-            if (nsx == 2) /* 'll' */ goto LL;
-            if ((sx[2]|32) == 'u' && nsx == 3) /* 'llu' */ { u=1; goto LL; }
-         }
-         return 0;
-      } else if ((sx[0]|32) == 'e' || (sx[0]|32) == 'p')
-         goto Float;
-      else return 0;
-
-#define I(T) if (n <= max4typ[T - TYINT]) { ty = T; goto Ok; }
-      I(TYINT)
-      if (u || !dec) I(TYUINT)
-   L:
-      I(TYLONG)
-      if (u || !dec || !longlongok) I(TYULONG)
-      if (longlongok) {
-      LL:
-         I(TYVLONG)
-         if (u || !dec) I(TYUVLONG)
-      }
-      if (ispp) { ty = TYUVLONG; goto Ok; }
-#undef I
-      /* too big */
-      if (outi) *outi = n;
-      return 0;
-   Ok:
-      if (u && issignedt(ty)) ++ty; /* make unsigned */
-      if (outi) *outi = n;
-      if (ispp) {
-         if (u) return TYUVLONG;
-         else if (n <= max4typ[TYVLONG-TYINT]) return TYVLONG;
-      }
-      if (ty >= TYVLONG && !longlongok)
-         warn(&tk->span, "'long long' in %M is an extension");
-      return ty;
-   }
-}
-
-static void
-readstrchrlit(struct lexer *lx, struct token *tk, char delim, int wide)
-{
-   int c, i;
-   uchar tmp[200];
-   vec_of(uchar) b = VINIT(tmp, sizeof tmp);
-   struct span span = {0};
-   uint n, beginoff, idx;
-   beginoff = idx = lx->chridx;
-
-   while ((c = next(lx)) != delim) {
-      static uint wmax[] = {0xFF, 0xFFFF, 0xFFFFFFFFu};
-      if (c == '\n' || c == TKEOF) {
-      Noterm:
-         span.sl = (struct span0) { idx, lx->chridx - idx, lx->fileid };
-         error(&span, "missing terminating %c character", delim);
-         break;
-      } else if (c == '\\') {
-         span.sl = (struct span0) { idx, lx->chridx - idx, lx->fileid };
-         switch (c = next(lx)) {
-         case '\n': case TKEOF:
-            goto Noterm;
-         case '\'': c = '\''; break;
-         case '\\': c = '\\'; break;
-         case '"':  c = '"';  break;
-         case '?':  c = '?';  break;
-         case 'a':  c = '\a'; break;
-         case 'b':  c = '\b'; break;
-         case 'f':  c = '\f'; break;
-         case 'n':  c = '\n'; break;
-         case 'r':  c = '\r'; break;
-         case 't':  c = '\t'; break;
-         case 'v':  c = '\v'; break;
-         case 'x': case 'X': /* hex */
-            n = 0;
-            if (!aisxdigit(peek(lx, 0))) goto Badescseq;
-            do {
-               c = next(lx);
-               if (c-'0' < 10) n = n<<4 | (c-'0');
-               else            n = n<<4 | (10 + (c|0x20)-'a');
-            } while (aisxdigit(peek(lx, 0)));
-            if (n > wmax[wide]) {
-               span.sl.len = lx->chridx - span.sl.off;
-               error(&span, "hex escape sequence out of range");
-            }
-            c = n;
-            break;
-         default:
-            if (aisodigit(c)) { /* octal */
-               n = c-'0';
-               for (i = 2; i--;) {
-                  if (!aisodigit(peek(lx, 0))) break;
-                  n = n<<3 | ((c = next(lx))-'0');
-               }
-               if (n > wmax[wide]) {
-                  span.sl.len = lx->chridx - span.sl.off;
-                  error(&span, "octal escape sequence out of range");
-               }
-               c = n;
-               break;
-            }
-         Badescseq:
-            span.sl.len = lx->chridx - span.sl.off;
-            error(&span, "invalid escape sequence");
-         }
-      }
-      if (!wide || c <= 0xFF) {
-         vpush(&b, c);
-      } else {
-         /* XXX this doesn't work for non-utf sequences, UTF-16 surrogates, etc
-          * the source utf8 -> utf16/32 conversion should be done on the fly, then
-          * these can also be appended directly, rather than doing the conversion at the end */
-         char p[4];
-         int n = utf8enc(p, c);
-         vpushn(&b, p, n);
-      }
-      idx = lx->chridx;;
-   }
-   if (delim == '"') {
-      tk->t = TKSTRLIT;
-      tk->len = b.n;
-      if ((tk->wide = wide)) {
-         tk->litlit = 0;
-         if (wide == 1)
-            tk->ws16 = utf8to16(&tk->len, lx->tmparena, b.p, b.n);
-         else
-            tk->ws32 = utf8to32(&tk->len, lx->tmparena, b.p, b.n);
-      } else if (lx->chridx - beginoff == tk->len + 1) {
-         tk->litlit = 1;
-         tk->s = (char *)&lx->dat[beginoff];
-      } else {
-         tk->litlit = 0;
-         vpush(&b, 0);
-         tk->s = alloccopy(lx->tmparena, b.p, b.n, 1);
-      }
-   } else {
-      if (b.n == 0) {
-         span.sl = (struct span0) { idx, lx->chridx - idx, lx->fileid };
-         error(&span, "empty character literal");
-      } else if (b.n > targ_primsizes[TYINT]) {
-         span.sl = (struct span0) { idx, lx->chridx - idx, lx->fileid };
-         error(&span, "multicharacter literal too long");
-      }
-      tk->t = TKCHRLIT;
-      tk->len = b.n;
-      if ((tk->wide = wide)) {
-         tk->litlit = 0;
-         if (wide == 1)
-            tk->ws16 = utf8to16(&tk->len, lx->tmparena, b.p, b.n);
-         else
-            tk->ws32 = utf8to32(&tk->len, lx->tmparena, b.p, b.n);
-      } else if (lx->chridx - beginoff == tk->len + 1) {
-         tk->litlit = 1;
-         tk->s = (char *)&lx->dat[beginoff];
-      } else {
-         tk->litlit = 0;
-         tk->s = alloccopy(lx->tmparena, b.p, tk->len, 1);
-      }
-   }
-   vfree(&b);
-}
-
-/* for #include directive, read "header" or <header> */
-static void
-readheadername(struct lexer *lx, struct token *tk, char delim)
-{
-   int c;
-   uchar tmp[200];
-   vec_of(uchar) b = VINIT(tmp, sizeof tmp);
-   struct span span = {0};
-   uint beginoff, idx;
-   beginoff = idx = lx->chridx;
-
-   while ((c = next(lx)) != delim) {
-      if (c == '\n' || lx->eof) {
-         span.sl = (struct span0) { idx, lx->chridx - idx, lx->fileid };
-         error(&span, "missing terminating %c character", delim);
-         break;
-      }
-      vpush(&b, c);
-      idx = lx->chridx;;
-   }
-   tk->t = delim == '"' ? TKPPHDRQ : TKPPHDRH;
-   tk->len = b.n;
-   if (lx->chridx - beginoff == tk->len + 1) {
-      tk->litlit = 1;
-      tk->s = (char *)&lx->dat[beginoff];
-   } else {
-      tk->litlit = 0;
-      vpush(&b, 0);
-      tk->s = alloccopy(lx->tmparena, b.p, b.n, 1);
-   }
-   vfree(&b);
-}
-
-/* matches "<digit> | <identifier-nondigit> | '.' | ([eEpP][+-])" */
-static bool
-isppnum(char prev, char c)
-{
-   if (!aissep(c) || c == '.')
-     return 1;
-   if (c == '+' || c == '-')
-     return (prev|0x20) == 'e' || (prev|0x20) == 'p';
-   return 0;
-}
-
-enum { MAXLITLEN = 256 }; /* maximum length of num literals and identifiers */
-static int
-lex0(struct lexer *lx, struct token *tk, bool includeheader)
-{
-   int idx,q;
-   bool space = 0;
-Begin:
-   idx = lx->chridx;
-   if (lx->chrbuf0+4 >= countof(lx->chrbuf))
-      fillchrbuf(lx);
-   lx->chridx = lx->chridxbuf[lx->chrbuf0];
-   uchar *p = &lx->chrbuf[lx->chrbuf0++],
-         c = p[0];
-   switch (c) {
-
-#define RET(t_) do { tk->t = (t_); goto End; } while (0)
-#define TK2(c2,t) if (p[1] == c2) {            \
-      lx->chridx = lx->chridxbuf[lx->chrbuf0]; \
-      ++lx->chrbuf0;                           \
-      RET(t);                                  \
-   }
-#define TK3(c2,c3,t) if (p[1] == c2 && p[2] == c3) { \
-      lx->chridx = lx->chridxbuf[++lx->chrbuf0];     \
-      ++lx->chrbuf0;                                 \
-      RET(t);                                        \
-   }
-
-   case ' ': case '\t': case '\f': case '\v': case '\r':
-      space = 1;
-      goto Begin;
-      break;
-   case '(': case ')': case ',': case ':':
-   case ';': case '?': case '[': case ']':
-   case '{': case '}': case '~': case '$':
-   case '@': case '`': case '\\': case '\n':
-      RET(c);
-   case '!':
-      TK2('=', TKNEQ);
-      RET(c);
-   case '#':
-      TK2('#', TKPPCAT);
-      RET(c);
-   case '+':
-      TK2('+', TKINC);
-      TK2('=', TKSETADD);
-      RET(c);
-   case '-':
-      TK2('-', TKDEC);
-      TK2('=', TKSETSUB);
-      TK2('>', TKARROW);
-      RET(c);
-   case '*':
-      TK2('=', TKSETMUL);
-      RET(c);
-   case '/':
-      TK2('=', TKSETDIV);
-      if (match(lx, '/')) {
-         /* // single line comment */
-         for (;;) {
-            do {
-               if (lx->chrbuf[lx->chrbuf0] == '\n') {
-                  lx->chridx = lx->chridxbuf[lx->chrbuf0++];
-                  lx->eof = lx->chridx >= lx->ndat;
-                  RET('\n');
-               } else if (lx->eof) RET(TKEOF);
-            } while (++lx->chrbuf0 < countof(lx->chrbuf));
-            fillchrbuf(lx);
-            lx->chridx = lx->chridxbuf[lx->chrbuf0];
-            lx->eof = lx->chridx >= lx->ndat;
-         }
-      } else if (match(lx, '*')) {
-         // /* multi line comment */
-         if (lx->chrbuf0+1 >= countof(lx->chrbuf)) fillchrbuf(lx);
-         for (;;) {
-            do {
-               if (lx->chrbuf[lx->chrbuf0] == '*' && lx->chrbuf[lx->chrbuf0+1] == '/') {
-                  lx->chridx = lx->chridxbuf[lx->chrbuf0+1];
-                  lx->chrbuf0 += 2;
-                  lx->eof = lx->chridx >= lx->ndat;
-                  space = 1;
-                  goto Begin;
-               }
-            } while (++lx->chrbuf0+1 < countof(lx->chrbuf));
-            fillchrbuf(lx);
-            lx->chridx = lx->chridxbuf[lx->chrbuf0];
-            if ((lx->eof = (lx->chridx >= lx->ndat))) {
-               struct span span = {{ idx, lx->chridx - idx, lx->fileid }};
-               fatal(&span, "unterminated comment");
-            }
-         }
-      }
-      RET(c);
-   case '%':
-      TK2('=', TKSETREM);
-      RET(c);
-   case '^':
-      TK2('=', TKSETXOR);
-      RET(c);
-   case '=':
-      TK2('=', TKEQU);
-      RET(c);
-   case '<':
-      if (includeheader) {
-         readheadername(lx, tk, '>');
-         goto End;
-      }
-      TK2('=', TKLTE);
-      TK3('<','=', TKSETSHL)
-      TK2('<', TKSHL);
-      RET(c);
-   case '>':
-      TK2('=', TKGTE);
-      TK3('>','=', TKSETSHR)
-      TK2('>', TKSHR);
-      RET(c);
-   case '&':
-      TK2('&', TKLOGAND);
-      TK2('=', TKSETAND);
-      RET(c);
-   case '|':
-      TK2('|', TKLOGIOR);
-      TK2('=', TKSETIOR);
-      RET(c);
-   case '"':
-      if (includeheader) {
-         readheadername(lx, tk, '"');
-      } else {
-   case '\'':
-         tk->wideuni = 0;
-         readstrchrlit(lx, tk, c, 0);
-      }
-      goto End;
-   case '.':
-      TK3('.','.',TKDOTS)
-      if (aisdigit(p[1])) goto Numlit;
-      RET(c);
-   case 'L':
-      if (match(lx, (q = '\'')) || match(lx, (q = '"'))) {
-         tk->wideuni = 0;
-         readstrchrlit(lx, tk, q, /* wide */ targ_primsizes[targ_wchartype] == 2 ? 1 : 2);
-         goto End;
-      }
-      /* fallthru */
-   default:
-      if (aisdigit(c)) Numlit: {
-         --lx->chrbuf0;
-         if (lx->chrbuf0 + MAXLITLEN >= countof(lx->chrbuf))
-            fillchrbuf(lx);
-         int n = 1;
-         uchar *p = &lx->chrbuf[lx->chrbuf0];
-         for (; isppnum(p[n-1], p[n]); ++n) {
-            if (n >= MAXLITLEN) {
-               lx->chridx = lx->chridxbuf[lx->chrbuf0+n-1];
-            TooLong:
-               fatal(&(struct span) {{ idx, lx->chridx - idx, lx->fileid }},
-                     "token is too long");
-            }
-         }
-         tk->len = n;
-         lx->chridx = lx->chridxbuf[(lx->chrbuf0 += n) - 1];
-         if (n == lx->chridx - idx) {
-            tk->litlit = 1;
-            tk->s = (char *)&lx->dat[idx];
-         } else {
-            tk->litlit = 0;
-            tk->s = alloccopy(lx->tmparena, p, n, 1);
-         }
-         RET(TKNUMLIT);
-      } else if (c == '_' || aisalpha(c)) {
-         --lx->chrbuf0;
-         if (lx->chrbuf0 + MAXLITLEN >= countof(lx->chrbuf))
-            fillchrbuf(lx);
-         uchar *p = &lx->chrbuf[lx->chrbuf0];
-         int n = 1;
-         for (; !aissep(p[n]); ++n) {
-            if (n >= MAXLITLEN) {
-               lx->chridx = lx->chridxbuf[lx->chrbuf0+n-1];
-               goto TooLong;
-            }
-         }
-         tk->blue = 0;
-         tk->len = n;
-         tk->name = intern_((char *)p, n);
-         lx->chridx = lx->chridxbuf[(lx->chrbuf0 += n) - 1];
-         RET(TKIDENT);
-      }
-      /* fallthru */
-   case 0: if (lx->idx >= lx->ndat) RET(TKEOF);
-#undef TK2
-   }
-   fatal(&(struct span) {{ idx, lx->chridx - idx, lx->fileid }},
-         "unexpected character %'c at %d (%d)", c, idx, lx->idx);
-End:
-   tk->space = space;
-   tk->span.sl.file = lx->fileid;
-   tk->span.sl.off = idx;
-   tk->span.sl.len = lx->chridx - idx;
-   tk->span.ex = tk->span.sl;
-   return tk->t;
-#undef RET
-}
-
-/****************/
-/* PREPROCESSOR */
-/****************/
-
-static bool
-tokequ(const struct token *a, const struct token *b)
-{
-   if (a->t != b->t) return 0;
-   if (a->t == TKNUMLIT || a->t == TKSTRLIT || a->t == TKCHRLIT) {
-      if (a->len != b->len) return 0;
-      return !memcmp(a->s, b->s, a->len);
-   } else if (a->t == TKIDENT) {
-      return a->name == b->name;
-   } else if (a->t == TKPPMACARG || a->t == TKPPMACSTR) {
-      return a->argidx == b->argidx;
-   }
-   return 1;
-}
-
-static vec_of(struct token) mtoksbuf, /* buffers for macro replacement list tokens */
-                            mdyntoksbuf; /* for function-like macros after parameter substitution */
-
-struct macro {
-   internstr *param;
-   struct span0 span;
-   uchar nparam;
-   bool predef : 1,
-        special : 1,
-        fnlike : 1,
-        variadic : 1;
-   short id;
-   union {
-      void (*handler)(struct lexer *, struct token *);
-      struct rlist {
-         uint off; /* mtoksbuf[] */
-         int n;
-      } rl;
-      const struct token *single; /* predef */
-      void (*handlerfn)(struct lexer *, struct token *ret, const struct token *arg, int narg);
-   };
-};
-
-static bool
-macroequ(const struct macro *a, const struct macro *b)
-{
-   if (a->special != b->special) return 0;
-   if (a->fnlike != b->fnlike || a->variadic != b->variadic) return 0;
-   if (a->fnlike) {
-      if (a->nparam != b->nparam) return 0;
-      for (int i = 0; i < a->nparam; ++i)
-         if (a->param[i] != b->param[i])
-            return 0;
-   }
-   if (a->special) return a->handler == b->handler;
-   if (a->rl.n != b->rl.n) return 0;
-   const struct token *tka = &mtoksbuf.p[a->rl.off], *tkb = &mtoksbuf.p[b->rl.off];
-   for (int i = 0; i < a->rl.n; ++i) {
-      if (!tokequ(&tka[i], &tkb[i]))
-         return 0;
-      if (i > 0 && tka[i].space != tkb[i].space)
-         return 0;
-   }
-   return 1;
-}
-
-static void
-freemac(struct macro *mac)
-{
-   if (mac->special) return;
-   free(mac->param);
-}
-
-static pmap_of(struct macro) macroht;
-
-static void
-putmac(internstr name, struct macro *mac)
-{
-   static short id;
-   if (!macroht.v) pmap_init(&macroht, 1<<10);
-   struct macro *slot = pmap_get(&macroht, name);
-   mac->id = id++;
-   if (slot) {
-      if (!macroequ(slot, mac)) {
-         if (slot->predef)
-            warn(&(struct span){mac->span}, "redefining builtin macro");
-         else {
-            warn(&(struct span){mac->span}, "redefining macro");
-            note(&(struct span){slot->span}, "previous definition:");
-         }
-         freemac(slot);
-         *slot = *mac;
-      } else {
-         freemac(mac);
-      }
-   } else {
-      pmap_set(&macroht, name, *mac);
-   }
-}
-
-static void
-delmac(internstr name)
-{
-   struct macro *slot = pmap_get(&macroht, name);
-   if (!slot) return;
-   freemac(slot);
-   pmap_del(&macroht, name);
-}
-
-static inline internstr
-macname(struct macro *mac)
-{
-   return macroht.mb.k[mac - macroht.v];
-}
-
-static inline struct macro *
-findmac(internstr name)
-{
-   return pmap_get(&macroht, name);
-}
-
-static void popmac(struct lexer *, bool all);
-
-static struct macrostack {
-   struct {
-      union {
-         uint off; /* mtoksbuf[]/mdyntoksbuf[] */
-         const struct token *p;
-      };
-      int n;
-   } rl;
-   struct span0 exspan;
-   int idx;
-   short macid; /* -1 for argument undergoing expansion */
-   bool space : 1, stop : 1, dyn;
-} mstk[1200];
-
-static void NORETURN
-lxfatal(struct lexer *lx, const struct span *span, const char *fmt, ...)
-{
-   if (fmt) {
-      va_list ap;
-      va_start(ap, fmt);
-      vdiag(span, DGERROR, fmt, ap);
-      va_end(ap);
-   }
-   int n = lx->macstk ? lx->macstk - mstk : 0, i = 0;
-   for (struct macrostack *l = lx->macstk; l && l > mstk; --l, ++i) {
-      if (i < 4 || i > n - 5) {
-         note(&(struct span){l->exspan}, "expanded from here");
-      } else if (i == 5) {
-         efmt(" (...) \n");
-      }
-   }
-   for (struct lexer *sv = lx->save; sv; sv = sv->save) {
-      int line;
-      const char *f = getfilepos(&line, NULL, sv->fileid, sv->chridx-2);
-      note(NULL, "in file included from %s:%d", f, line);
-   }
-   if (!fmt || span) efmt("Aborting due to previous error.\n");
-   exit(1);
-}
-
-static void
-ppskipline(struct lexer *lx)
-{
-   while (lx->macstk) popmac(lx, 1);
-   for (int c; (c = peek(lx, 0)) != '\n' && !lx->eof; next(lx)) {
-      if (c == '/' && peek(lx, 1) == '*') { /* comment */
-         next(lx), next(lx);
-         bool done = 0;
-         while (!((c = peek(lx, 0)) == '*' && peek(lx, 1) == '/')) {
-            if (lx->eof) {
-               struct span span = {{ lx->idx, lx->chridx - lx->idx, lx->fileid }};
-               lxfatal(lx, &span, "unterminated comment");
-            }
-            done = c == '\n';
-            next(lx);
-         }
-         next(lx);
-         if (done) return;
-      }
-   }
-}
-
-#define isppident(tk) in_range((tk).t, TKIDENT, TKWEND_)
-
-static bool
-tokpaste(struct lexer *lx, struct token *dst, const struct token *l, const struct token *r)
-{
-   int t;
-   if (isppident(*l) && (isppident(*r) || r->t == TKNUMLIT)) {
-      /* foo ## bar  ;   foo ## 123 */
-      t = TKIDENT;
-   } else if (l->t == TKNUMLIT && (isppident(*r) || r->t == TKNUMLIT)) {
-      /* 0x ## abc   ;   213 ## 456 */
-      t = TKNUMLIT;
-   } else if (l->t && !r->t) {
-      if (dst) *dst = *l;
-      return 1;
-   } else if (!l->t && r->t) {
-      if (dst) *dst = *r;
-      return 1;
-   } else {
-      static const struct { char s[2]; char t; } tab[] = {
-         {"==", TKEQU}, {"!=", TKNEQ}, {"<=", TKLTE}, {">=", TKGTE},
-         {">>", TKSHR}, {"<<", TKSHL}, {"++", TKINC}, {"--", TKDEC},
-         {"->", TKARROW}, {"##", TKPPCAT}, {"&&", TKLOGAND}, {"||", TKLOGIOR},
-         {"+=", TKSETADD}, {"-=", TKSETSUB}, {"*=", TKSETMUL}, {"/=", TKSETDIV},
-         {"%=", TKSETREM}, {"|=", TKSETIOR}, {"^=", TKSETXOR}, {"&=", TKSETAND},
-         {{TKSHL,'='}, TKSETSHL}, {{TKSHR,'='}, TKSETSHR}
-      };
-      for (int i = 0; i < countof(tab); ++i) {
-         if (tab[i].s[0] == l->t && tab[i].s[1] == r->t) {
-            if (dst) dst->t = tab[i].t;
-            return 1;
-         }
-      }
-
-      if (dst) {
-         error(&l->span, "pasting %'tk and %'tk does not form a valid preprocessing token", l, r);
-         note(&r->span, "right-hand side");
-      }
-      return 0;
-   }
-
-   if (!dst) return 1;
-   char buf[200];
-   memset(dst, 0, sizeof *dst);
-   dst->span = l->span;
-   if (dst->span.ex.file == r->span.ex.file && dst->span.ex.off < r->span.ex.off)
-      joinspan(&dst->span.ex, r->span.ex);
-   dst->t = t;
-   dst->len = l->len + r->len;
-   char *s = (isppident(*dst) && dst->len + 1 < sizeof buf) ? buf : alloc(lx->tmparena, dst->len + 1, 1);
-   memcpy(s, l->s, l->len);
-   memcpy(s + l->len, r->s, r->len);
-   s[dst->len] = 0;
-   dst->space = l->space;
-   if (isppident(*dst)) {
-      dst->blue = 0;
-      dst->name = intern(s);
-   } else {
-      dst->s = s;
-   }
-   return 1;
-}
-
-enum { MAXMACROARGS = 128 };
-
-static void
-ppdefine(struct lexer *lx)
-{
-   struct token tk0, tk;
-   internstr mname;
-   struct macro mac = {0};
-   struct bitset usedparams[BSSIZE(MAXMACROARGS)] = {0};
-
-   lex0(lx, &tk0, 0);
-   if (tk0.t != TKIDENT) {
-      error(&tk0.span, "macro name missing");
-      ppskipline(lx);
-      return;
-   }
-   mname = tk0.name;
-   mac.span = tk0.span.sl;
-
-   if (match(lx, '(')) {
-      /* gather params for function-like macro */
-      vec_of(internstr) params = {0};
-      vinit(&params, NULL, 4);
-      mac.fnlike = 1;
-      while (lex0(lx, &tk, 0) != ')') {
-         if (mac.variadic) {
-            error(&tk.span, "expected `)' after `...'");
-            if (tk.t == TKEOF || tk.t == '\n') return;
-            break;
-         }
-         if (params.n > 0) {
-            if (tk.t == TKDOTS) { /* GNU extension 'args...' */
-               mac.variadic = 1;
-               continue;
-            } if (tk.t != ',') {
-               error(&tk.span, "expected `,' or `)'");
-               if (tk.t == TKEOF || tk.t == '\n') return;
-               break;
-            }
-            lex0(lx, &tk, 0);
-         }
-         if (tk.t == TKIDENT)
-            vpush(&params, tk.name);
-         else if (tk.t == TKDOTS) {
-            mac.variadic = 1;
-            vpush(&params, intern("__VA_ARGS__"));
-         } else {
-            error(&tk.span, "expected parameter name or `)'");
-            if (tk.t == TKEOF || tk.t == '\n') return;
-            break;
-         }
-      }
-      if (!params.n) vfree(&params);
-      mac.param = params.p;
-      mac.nparam = params.n;
-   }
-
-   /* gather replacement list */
-   mac.rl.off = mtoksbuf.n;
-   for (int n = 0; lex0(lx, &tk, 0) != '\n' && tk.t != TKEOF;) {
-      if (n == 0 && !tk.space)
-         warn(&tk.span, "no whitespace after macro name");
-      struct token *prev = n ? &mtoksbuf.p[mtoksbuf.n-1] : NULL;
-      if (mac.fnlike && tk.t == TKIDENT) {
-         for (int i = 0; i < mac.nparam; ++i) {
-            if (tk.name == mac.param[i]) {
-               bsset(usedparams, i);
-               tk.argidx = i;
-               if (prev && prev->t == '#') {
-                  tk.t = TKPPMACSTR;
-                  *prev = tk;
-                  goto Next;
-               } else {
-                  tk.t = TKPPMACARG;
-                  break;
-               }
-            }
-         }
-      }
-      if (n > 1 && prev->t == TKPPCAT) {
-         struct token new;
-         if (prev[-1].t != TKPPMACARG && tk.t != TKPPMACARG
-          && tokpaste(lx, &new, &prev[-1], &tk))
-         {
-            /* trivial concatenations */
-            prev[-1] = new;
-            --mtoksbuf.n;
-            --n;
-            continue;
-         }
-      }
-      if (in_range(tk.t, TKNUMLIT, TKSTRLIT) && !tk.litlit)
-         tk.s = alloccopy(&globarena, tk.s, tk.len << tk.wide, 1);
-      vpush(&mtoksbuf, tk);
-      ++n;
-   Next:;
-   }
-   mac.rl.n = mtoksbuf.n - mac.rl.off;
-   /* mark unused params as such by nulling out param name,
-    * this way they aren't expanded when unused in the macro body */
-   for (uint i = 0; bsiterzr(&i, usedparams, countof(usedparams)) && i < mac.nparam; ++i) {
-      mac.param[i] = NULL;
-   }
-   putmac(mname, &mac);
-}
-
-static void
-expecteol(struct lexer *lx, const char *ppname)
-{
-   struct token tk;
-   assert(!lx->macstk);
-   if (lex0(lx, &tk, 0) != '\n' && tk.t != TKEOF) {
-      (ccopt.pedant ? error : warn)(&tk.span, "extra tokens after #%s", ppname);
-      ppskipline(lx);
-   }
-}
-static void
-ppundef(struct lexer *lx)
-{
-   struct token tk;
-
-   lex0(lx, &tk, 0);
-   if (tk.t != TKIDENT) {
-      error(&tk.span, "macro name missing");
-      ppskipline(lx);
-      return;
-   }
-   expecteol(lx, "undef");
-   delmac(tk.name);
-}
-
-static void
-pushmacstk(struct lexer *lx, const struct span *span, const struct macrostack *m)
-{
-   struct macrostack *l = lx->macstk;
-   if (!l) l = mstk;
-   else if ((++l == mstk+countof(mstk))) lxfatal(lx, span, "macro expansion depth limit reached");
-   *l = *m;
-   l->idx = 0;
-   l->exspan = span->ex;
-   lx->macstk = l;
-}
-
-static void
-popmac(struct lexer *lx, bool all)
-{
-   struct macrostack *stk;
-
-   assert(stk = lx->macstk);
-   do {
-      if (stk->dyn)
-         mdyntoksbuf.n -= stk->rl.n;
-      if (lx->macstk == mstk) lx->macstk = NULL;
-      else --lx->macstk;
-      if (!all) break;
-   } while ((stk = lx->macstk) && stk->idx >= stk->rl.n && !stk->stop);
-}
-
-
-static inline const struct token *
-stkgetrl(struct macrostack *s)
-{
-   if (s->macid < 0) return s->rl.p;
-   return (s->dyn ? mdyntoksbuf.p : mtoksbuf.p) + s->rl.off;
-}
-
-static void expandfnmacro(struct lexer *lx, struct span *span, internstr mname, struct macro *mac);
-
-static enum expandres { EXPNONE, EXPINL, EXPSTACK }
-tryexpand(struct lexer *lx, struct token *tk)
-{
-   struct span span = tk->span;
-   struct macro *mac = NULL;
-   internstr mname = tk->name;
-
-   if (tk->t != TKIDENT || tk->blue || !(mac = findmac(mname)))
-      return EXPNONE;
-
-   /* prevent infinite recursion */
-   for (struct macrostack *l = lx->macstk; l && l+1 > mstk; --l) {
-      if (l->macid == mac->id) {
-         tk->blue = 1;
-         return EXPNONE;
-      }
-   }
-
-   struct macrostack *stkprev = lx->macstk;
-   if (mac->special && !mac->fnlike) {
-      mac->handler(lx, tk);
-      return EXPINL;
-   } else if (mac->fnlike) {
-      /* look if there is a '(' token ahead, expand if so */
-      struct macrostack *s = lx->macstk;
-      if (s && s->idx >= s->rl.n && !s->stop) {
-         popmac(lx, 1);
-         s = lx->macstk;
-      }
-      if (!s) { /* top-level context: looking ahead in file data */
-         struct token tk;
-         int t;
-         for (;;) { /* skip whitespace and comments */
-            if (aisspace(t = peek(lx, 0))) next(lx);
-            else if (t == '/') {
-               int idx = lx->chridx;
-               switch (peek(lx, 1)) {
-               case '/':
-                  while (!lx->eof && next(lx) != '\n') ;
-                  continue;
-               case '*':
-                  next(lx), next(lx);
-                  while (peek(lx, 0) != '*' || peek(lx, 1) != '/') {
-                     if (lx->eof) {
-                        struct span span = {{ idx, lx->chridx - idx, lx->fileid }};
-                        lxfatal(lx, &span, "unterminated comment");
-                     }
-                     next(lx);
-                  }
-                  next(lx), next(lx);
-                  continue;
-               }
-               break;
-            } else break;
-         }
-         if (t != '(') return 0;
-         lex0(lx, &tk, 0);
-      } else { /* expansion context: look ahead in macro stack */
-         if (s->idx >= s->rl.n || stkgetrl(s)[s->idx].t != '(') return 0;
-         ++s->idx;
-      }
-      expandfnmacro(lx, &span, mname, mac);
-   } else if (mac->predef && mac->single) {
-      struct span span = tk->span;
-      *tk = *mac->single;
-      tk->span = span;
-      return EXPINL;
-   } else if (mac->rl.n) {
-      pushmacstk(lx, &span, &(struct macrostack){
-         .rl = { .off = mac->rl.off, .n = mac->rl.n },
-         .macid = mac->id,
-         .space = tk->space,
-      });
-   }
-   if (lx->macstk != stkprev) {
-      lx->macstk->space = tk->space;
-   }
-   return EXPSTACK;
-}
-
-static bool
-advancemacstk(struct lexer *lx, struct token *tk)
-{
-   struct macrostack *s = lx->macstk;
-   assert(s != NULL);
-   if (s->idx >= s->rl.n) {
-      if (s->stop) {
-         tk->t = TKEOF;
-         return 1;
-      }
-      popmac(lx, 1);
-      return 0;
-   }
-   *tk = stkgetrl(s)[s->idx];
-   if (s->idx == 0) {
-      /* the first token of the replaced expansion gets its space from the
-       * context in which it is expanded */
-      tk->space = s->space;
-   }
-   ++s->idx;
-   assert(tk->t && tk->t != TKEOF);
-   tk->span.ex = s->exspan;
-   return tryexpand(lx, tk) != EXPSTACK;
-}
-
-static void
-expandfnmacro(struct lexer *lx, struct span *span, internstr mname, struct macro *mac)
-{
-   struct token _argsbuf[30];
-   vec_of(struct token) argsbuf = VINIT(_argsbuf, countof(_argsbuf)); /* buffer for argument tokens */
-   struct span excessspan;
-   int cur, len, i, bal, narg;
-   struct token tk;
-   bool toomany = 0;
-   struct argtks {
-      int idx, n; /* slices of argsbuf */
-      int idx2, n2;
-      ushort nfirstx, /* for concatenation to work properly with expanded arguments, */
-             nlastx;  /* length of expanded first and last tokens of the unexpanded argument */
-   } _args0[4],
-     *args = mac->nparam < countof(_args0) ? _args0 : alloc(lx->tmparena, sizeof *args * mac->nparam, 0);
-
-   cur = i = bal = len = narg = 0;
-   for (struct macrostack *s = lx->macstk;;) {
-      if (!s) {
-         bool nl = 0;
-         for (;; nl = 1) {
-            lex0(lx, &tk, 0);
-            if (tk.t != '\n') break;
-         }
-         tk.space |= nl;
-      }
-      else {
-         tk = s->idx < s->rl.n ? stkgetrl(s)[s->idx++] : (struct token){TKEOF};
-      }
-      if (((tk.t == ')' && bal == 0) || tk.t == TKEOF)) break;
-      if (tk.t == ',' && bal == 0) {
-         ++narg;
-         if (i == mac->nparam-1 && !mac->variadic) {
-            excessspan = tk.span;
-            toomany = 1;
-         } else if (i < mac->nparam - mac->variadic) {
-            assert(i < MAXMACROARGS);
-            args[i].idx = cur;
-            args[i].n = len;
-            cur = argsbuf.n;
-            len = 0;
-            ++i;
-         } else if (mac->variadic) {
-            vpush(&argsbuf, tk);
-            ++len;
-         }
-      } else if (!toomany) {
-         if (tk.t == '(') ++bal;
-         else if (tk.t == ')') --bal;
-         vpush(&argsbuf, tk);
-         ++len;
-      }
-   }
-
-   if (tk.t == TKEOF) {
-      joinspan(&span->ex, tk.span.ex);
-      lxfatal(lx, span, "unterminated function-like macro invocation");
-   } else if (i < mac->nparam) {
-      ++narg;
-      args[i].idx = cur;
-      args[i].n = len;
-      cur = argsbuf.n;
-      len = 0;
-      ++i;
-   }
-   joinspan(&span->ex, tk.span.ex);
-   int expargs0 = argsbuf.n;
-   for (int i = 0; i < mac->nparam; ++i) {
-      struct argtks *arg = &args[i];
-      if (i >= narg) {
-         memset(arg, 0, sizeof *arg);
-      } else if (!mac->param || (mac->param[i] && arg->n > 0)) {
-         /* expand args used in the macro body */
-         pushmacstk(lx, &tk.span, &(struct macrostack) {
-            .rl = { .p = argsbuf.p + arg->idx, .n = arg->n },
-            .macid = -1,
-            .stop = 1,
-         });
-         struct macrostack *l = lx->macstk;
-         arg->idx2 = argsbuf.n;
-         arg->nfirstx = arg->nlastx = 1;
-         int ilastx = -1;
-         for (bool pad = 0;;) {
-            struct macrostack *sprev = lx->macstk;
-            if (!advancemacstk(lx, &tk)) {
-               pad |= tk.space && lx->macstk == sprev; /* preserve whitespace empty macro */
-               if (lx->macstk == l && l->idx == 1)
-                  arg->nfirstx = argsbuf.n - arg->idx2;
-               if (lx->macstk == l+1 && lx->macstk->idx == 0 && l->idx == l->rl.n)
-                  ilastx = argsbuf.n - arg->idx2;
-               continue;
-            }
-            if (tk.t == TKEOF) break;
-            size_t off = l->rl.p - argsbuf.p;
-            tk.space |= pad;
-            vpush(&argsbuf, tk);
-            l->rl.p = argsbuf.p + off;
-            pad = 0;
-         }
-         arg->n2 = argsbuf.n - arg->idx2;
-         arg->nlastx = ilastx < 0 ? 1 : args->n2 - ilastx;
-         assert(lx->macstk == l);
-         popmac(lx, 0);
-      } else {
-         memset(arg, 0, sizeof *arg);
-      }
-   }
-   if (narg < mac->nparam - mac->variadic) {
-      warn(span, "macro `%s' passed %d arguments, but takes %d", mname, narg, mac->nparam);
-   } else if (toomany) {
-      joinspan(&excessspan.ex, tk.span.ex);
-      warn(&excessspan, "macro `%s' passed %d arguments, but takes just %d", mname, narg, mac->nparam);
-   }
-   if (mac->special) {
-      mac->handlerfn(lx, &tk, argsbuf.p+expargs0, argsbuf.n-expargs0);
-      vpush(&mdyntoksbuf, tk);
-      pushmacstk(lx, span, &(struct macrostack){
-         .rl = { .off = mdyntoksbuf.n-1, .n = 1 },
-         .dyn = 1,
-         .macid = mac->id,
-      });
-   } else if (mac->nparam > 0) { /* make new rlist with args replaced */
-      bool vaoptskip = 0, spacepad = 0;
-      int vaoptbal = 0;
-      uint off = mdyntoksbuf.n;
-      for (int i = 0; i < mac->rl.n; ++i) {
-         struct argtks *arg;
-         const struct token *tki = &mtoksbuf.p[mac->rl.off+i];
-         if (vaoptskip) {
-            assert(vaoptbal > 0);
-            if (tki->t == '(') ++vaoptbal;
-            else if (tki->t == ')') {
-               if (--vaoptbal == 0) vaoptskip = 0;
-            }
-            continue;
-         }
-         if (tki->t == TKPPCAT && i > 0 && i < mac->rl.n-1) { /* concatenation */
-            const struct token *lhs = tki-1,
-                               *rhs = tki+1;
-            bool space = lhs->space | spacepad;
-            if (lhs->t == ',' && mac->variadic
-             && rhs->t == TKPPMACARG && rhs->argidx == mac->nparam-1) {
-               /* handle GNU extension:  ', ## __VA_ARGS__' */
-               arg = &args[rhs->argidx];
-               if (narg < mac->nparam) { /* no vaargs -> skip comma */
-                  assert(arg->n == 0);
-                  --mdyntoksbuf.n;
-               } else { /* otherwise put comma and substitute vaargs */
-                  vpushn(&mdyntoksbuf, argsbuf.p+arg->idx2, arg->n2);
-                  mdyntoksbuf.p[mdyntoksbuf.n - arg->n2].space |= rhs->space | tk.space;
-               }
-               ++i; /* we already handled rhs (__VA_ARGS__) */
-               continue;
-            }
-            if (i > 2 && tki[-2].t == TKPPCAT) {
-               /* handles chained concatenations: xyz ## arg ## c
-                *                                        lhs ^  rhs */
-               lhs = (off < mdyntoksbuf.n) ? &mdyntoksbuf.p[--mdyntoksbuf.n] : NULL;
-            } else if (lhs->t == TKPPMACARG) {
-               arg = &args[lhs->argidx];
-               lhs = arg->n ? &argsbuf.p[arg->idx + arg->n-1] : NULL;
-               if (lhs && arg->n > 1) space |= lhs->space;
-            } else {
-               --mdyntoksbuf.n;
-            }
-            if (rhs->t == TKPPMACARG) {
-               arg = &args[rhs->argidx];
-               rhs = arg->n ? &argsbuf.p[arg->idx] : NULL;
-            } else {
-               ++i;
-            }
-            if (!lhs && !rhs) continue;
-            spacepad = 0;
-            if (!lhs) vpush(&mdyntoksbuf, *rhs);
-            else if (!rhs) vpush(&mdyntoksbuf, *lhs);
-            else {
-               struct token new;
-               if (tokpaste(lx, &new, lhs, rhs)) {
-                  new.span.sl = tki->span.sl;
-               }
-               vpush(&mdyntoksbuf, new);
-            }
-            mdyntoksbuf.p[mdyntoksbuf.n-1].space = space;
-         } else if (tki->t != TKPPMACARG && tki->t != TKPPMACSTR) { /* regular token */
-            if (tki->t == TKIDENT && mac->variadic) {
-               /* handle GNUC __VA_OPT__(...) */
-               static internstr istr_vaopt;
-               if (!istr_vaopt) istr_vaopt = intern("__VA_OPT__");
-               if (tki->name == istr_vaopt && i+2 < mac->rl.n && tki[1].t == '(') {
-                  vaoptbal = 1;
-                  vaoptskip = args[mac->nparam-1].n == 0;
-                  ++i; /* skip open paren */
-                  continue;
-               }
-            }
-            if (vaoptbal) {
-               if (tki->t == '(') ++vaoptbal;
-               else if (tki->t == ')') {
-                  /* skip closing paren of __VA_OPT__ invocation */
-                  if (--vaoptbal == 0) continue;
-               }
-            }
-            vpush(&mdyntoksbuf, *tki);
-            mdyntoksbuf.p[mdyntoksbuf.n-1].space |= spacepad;
-            spacepad = 0;
-         } else if (tki->t == TKPPMACARG) {
-            arg = &args[tki->argidx];
-            if (arg->n == 0) {
-               spacepad = 1;
-               continue;
-            }
-            struct token *rl = argsbuf.p + arg->idx2;
-            int n = arg->n2;
-            bool skipfirst = 0;
-            if (i > 0 && tki[-1].t == TKPPCAT) {
-               /* skip first unexpanded token, was pasted */
-               rl += arg->nfirstx;
-               n -= arg->nfirstx;
-               skipfirst = 1;
-            }
-            if (i < mac->rl.n-2 && tki[1].t == TKPPCAT) {
-               /* skip last unexpanded token, will be pasted */
-               n -= arg->nlastx;
-            }
-            if (n > 0) {
-               vpushn(&mdyntoksbuf, rl, n);
-               if (!skipfirst)
-                  /* the first token of the expanded body gets its space from the replacement list */
-                  mdyntoksbuf.p[mdyntoksbuf.n - n].space = tki->space | spacepad;
-            }
-            spacepad = 0;
-         } else { /* PPMACSTR */
-            char tmp[200];
-            struct wbuf buf = MEMBUF(tmp, sizeof tmp);
-            int n = 0;
-
-            arg = &args[tki->argidx];
-            // XXX this is wrong bc the string literal produced should be re-parsed later
-            // i.e. stringifying the token sequence '\n' should ultimately produce a
-            // string with an actual newline, not {'\\','n'}
-         Redo:
-            for (int i = 0; i < arg->n; ++i) {
-               struct token *tk = &argsbuf.p[arg->idx + i];
-               if (i > 0 && tk->space)
-                  n += bfmt(&buf, " ");
-               n += bfmt(&buf, "%tk", tk);
-            }
-            ioputc(&buf, 0);
-            if (buf.err) {
-               struct wbuf new = MEMBUF(alloc(lx->tmparena, n+1, 1), n+1);
-               assert(buf.buf == tmp);
-               memcpy(&buf, &new, sizeof buf);
-               goto Redo;
-            }
-            vpush(&mdyntoksbuf, ((struct token) {
-               .t = TKSTRLIT,
-               .wide = 0,
-               .space = tki->space | spacepad,
-               .s = buf.buf != tmp ? buf.buf : alloccopy(lx->tmparena, buf.buf, buf.len, 1),
-               .len = buf.len-1,
-            }));
-            spacepad = 0;
-         }
-      }
-      uint n = mdyntoksbuf.n - off;
-
-      if (n) {
-         pushmacstk(lx, span, &(struct macrostack){
-            .rl = { .off = off, .n = n },
-            .macid = mac->id,
-            .dyn = 1,
-         });
-      }
-   } else if (mac->rl.n) {
-      pushmacstk(lx, span, &(struct macrostack){
-         .rl = { .off = mac->rl.off, .n = mac->rl.n },
-         .macid = mac->id,
-      });
-   }
-   vfree(&argsbuf);
-}
-
-static struct token epeektk;
-static int
-elex(struct lexer *lx, struct token *tk)
-{
-   assert(tk);
-   if (epeektk.t) {
-      int tt = epeektk.t;
-      if (tk) *tk = epeektk;
-      epeektk.t = 0;
-      return tt;
-   }
-   if (lx->macstk) {
-      if (!advancemacstk(lx, tk))
-         return elex(lx, tk);
-      return tk->t;
-   }
-
-   lex0(lx, tk, 0);
-   return tk->t;
-}
-
-static int
-epeek(struct lexer *lx, struct token *tk)
-{
-   if (!epeektk.t) elex(lx, &epeektk);
-   if (tk) *tk = epeektk;
-   return epeektk.t;
-}
-
-static int
-tkprec(int tt)
-{
-   static const char tab[] = {
-      ['*']   = 12, ['/']   = 12, ['%']  = 12,
-      ['+']   = 11, ['-']   = 11,
-      [TKSHL] = 10, [TKSHR] = 10,
-      ['<']   =  9, ['>']   = 9, [TKLTE] =  9, [TKGTE] = 9,
-      [TKEQU] =  8, [TKNEQ] = 8,
-      ['&']   =  7,
-      ['^']   =  6,
-      ['|']   =  5,
-      [TKLOGAND] = 4,
-      [TKLOGIOR] = 3,
-      ['?']   = 2,
-   };
-   if ((uint)tt < countof(tab))
-      return tab[tt] - 1;
-   return -1;
-}
-
-static vlong
-expr(struct lexer *lx, bool *pu, int prec, bool ignore)
-{
-   struct token tk;
-   enum typetag ty;
-   char unops[16];
-   int nunop = 0;
-   vlong x, y;
-   bool xu = 0, yu; /* x unsigned?; y unsigned? */
-
-Unary:
-   elex(lx, &tk);
-Switch:
-   switch (tk.t) {
-   case '-': case '~': case '!':
-      unops[nunop++] = tk.t;
-      if (nunop >= countof(unops)) {
-         x = expr(lx, &xu, 999, ignore);
-         break;
-      }
-      /* fallthru */
-   case '+': goto Unary;
-   case '(':
-      x = expr(lx, &xu, 1, ignore);
-      if (elex(lx, &tk) != ')') {
-         error(&tk.span, "expected ')'");
-         goto Err;
-      }
-      break;
-   case TKNUMLIT:
-   case TKCHRLIT:
-      ty = parsenumlit((uvlong *)&x, NULL, &tk, 1);
-      if (!ty) {
-         error(&tk.span, "bad number literal");
-         goto Err;
-      } else if (isfltt(ty)) {
-         error(&tk.span, "float literal in preprocessor expresion");
-         goto Err;
-      }
-      xu = isunsignedt(ty);
-      break;
-   default:
-      if (tk.t == TKIDENT) {
-         xu = 0;
-         if (!strcmp(tk.s, "defined")) {
-            /* 'defined' ppident */
-            bool paren = 0;
-            lex0(lx, &tk, 0);
-            if ((paren = tk.t == '(')) lex0(lx, &tk, 0);
-            if (!isppident(tk)) {
-               error(&tk.span, "expected macro name");
-               goto Err;
-            }
-            if (paren && lex0(lx, &tk, 0) != ')') {
-               error(&tk.span, "expected `)'");
-               goto Err;
-            }
-            x = findmac(tk.name) != NULL;
-         } else {
-            switch (tryexpand(lx, &tk)) {
-            case EXPSTACK: goto Unary;
-            case EXPINL: goto Switch;
-            case EXPNONE: x = 0; break; /* non defined pp name -> 0 */
-            }
-         }
-         break;
-      }
-      error(&tk.span, "expected preprocessor integer expression (near %'tk)", &tk);
-      goto Err;
-   }
-
-   while (nunop > 0) switch (unops[--nunop]) {
-      case '-': x = -(uvlong)x; break;
-      case '~': x = ~x; break;
-      case '!': x = !x; break;
-      default: assert(0);
-   }
-
-   for (int opprec; (opprec = tkprec(epeek(lx, &tk))) >= prec;) {
-      elex(lx, &tk);
-      if (tk.t == TKLOGAND) {
-         x = !!x & !!expr(lx, &yu, opprec+1, ignore || !x);
-         xu = 0;
-      } else if (tk.t == TKLOGIOR) {
-         x = !!x | !!expr(lx, &yu, opprec+1, ignore || x);
-         xu = 0;
-      } else if (tk.t == '?') {
-         struct span span = tk.span;
-         vlong m = expr(lx, &xu, 1, ignore || !x);
-         if (elex(lx, &tk) != ':') {
-            error(&tk.span, "expected ':'");
-            note(&span, "to match conditional expression here");
-            goto Err;
-         }
-         y = expr(lx, &yu, 1, ignore || x);
-         x = x ? m : y;
-         xu |= yu;
-      } else {
-         y = expr(lx, &yu, opprec + 1, ignore);
-         bool u = xu | yu;
-         switch ((int) tk.t) {
-         case   '+': x += (uvlong) y; break;
-         case   '-': x -= (uvlong) y; break;
-         case   '*': x = u ? (uvlong) x * y : x * y; break;
-         case   '&': x &= y; break;
-         case   '^': x ^= y; break;
-         case   '|': x |= y; break;
-         case   '/': if (y) x = u ? (uvlong) x / y : x / y;
-                     else if (ignore) x = 0;
-                     else goto Div0;
-                     break;
-         case   '%': if (y) x = u ? (uvlong) x % y : x % y;
-                     else if (ignore) x = 0;
-                     else Div0: error(&tk.span, "division by zero");
-                     break;
-         case TKSHL: if ((uvlong)y < 64) x <<= y;
-                     else if (ignore) x = 0;
-                     else goto BadShift;
-                     break;
-                     u = xu;
-         case TKSHR: if ((uvlong)y < 64) x = u ? (uvlong) x >> y : x >> y;
-                     else if (ignore) x = 0;
-                     else BadShift: error(&tk.span, "bad shift by %ld", y);
-                     u = xu;
-                     break;
-         case   '<': x = u ? (uvlong) x < y  : x < y;  u = 0; break;
-         case   '>': x = u ? (uvlong) x > y  : x > y;  u = 0; break;
-         case TKLTE: x = u ? (uvlong) x <= y : x <= y; u = 0; break;
-         case TKGTE: x = u ? (uvlong) x >= y : x >= y; u = 0; break;
-         case TKEQU: x = x == y; u = 0; break;
-         case TKNEQ: x = x != y; u = 0; break;
-         default: assert(0);
-         }
-         xu = u;
-      }
-   }
-   if (!prec) { /* not a sub expr */
-      if (elex(lx, &tk) != '\n' && tk.t != TKEOF) {
-         error(&tk.span, "extra tokens after preprocessor expression");
-         ppskipline(lx);
-      }
-   }
-   if (pu) *pu = xu;
-   return x;
-
-Err:
-   ppskipline(lx);
-   if (pu) *pu = xu;
-   return 0;
-}
-
-enum {
-   PPCNDFALSE, /* the condition was zero, skip until #else/#elif */
-   PPCNDTRUE, /* the condition was non-zero, emit until #else/#elif */
-   PPCNDTAKEN /* some branch was already taken, skip until #else */
-};
-static struct ppcnd {
-   struct span0 ifspan;
-   int filedepth;
-   uchar cnd;
-   bool elsep;
-} ppcndstk[32];
-static int nppcnd;
-
-static int includedepth;
-
-static void
-ppif(struct lexer *lx, const struct span *span)
-{
-   vlong v = expr(lx, NULL, 0, 0);
-   assert(nppcnd < countof(ppcndstk) && "too many nested #if");
-   ppcndstk[nppcnd].ifspan = span->sl;
-   ppcndstk[nppcnd].filedepth = includedepth;
-   ppcndstk[nppcnd].cnd = v ? PPCNDTRUE : PPCNDFALSE;
-   ppcndstk[nppcnd++].elsep = 0;
-}
-
-static void
-ppifxdef(struct lexer *lx, bool defp, const struct span *span)
-{
-   struct token tk;
-
-   lex0(lx, &tk, 0);
-   if (tk.t != TKIDENT) {
-      error(&tk.span, "macro name missing");
-      ppskipline(lx);
-      return;
-   }
-   expecteol(lx, defp ? "ifdef" : "ifndef");
-   if (!defp && lx->firstdirective) lx->inclguard = tk.name;
-   assert(nppcnd < countof(ppcndstk) && "too many nested #if");
-   ppcndstk[nppcnd].ifspan = span->sl;
-   ppcndstk[nppcnd].filedepth = includedepth;
-   ppcndstk[nppcnd].cnd = (findmac(tk.name) == NULL) ^ defp ? PPCNDTRUE : PPCNDFALSE;
-   ppcndstk[nppcnd++].elsep = 0;
-}
-
-static void
-ppelif(struct lexer *lx, const struct span *span)
-{
-   vlong v;
-   struct ppcnd *cnd;
-
-   if (!nppcnd) {
-      error(span, "#elif without matching #if");
-      ppif(lx, span);
-      return;
-   }
-   v = expr(lx, NULL, 0, 0);
-   cnd = &ppcndstk[nppcnd-1];
-   if (cnd->elsep) {
-      error(span, "#elif after #else");
-      return;
-   }
-   switch (cnd->cnd) {
-   case PPCNDTRUE: cnd->cnd = PPCNDTAKEN; break;
-   case PPCNDFALSE: cnd->cnd = v ? PPCNDTRUE : PPCNDFALSE; break;
-   }
-}
-static void
-ppelifxdef(struct lexer *lx, bool defp, const struct span *span)
-{
-   struct token tk;
-   struct ppcnd *cnd;
-
-   if (!nppcnd) {
-      error(span, "#elif%sdef without matching #if", &"n"[defp]);
-      ppif(lx, span);
-      return;
-   }
-   cnd = &ppcndstk[nppcnd-1];
-   if (cnd->elsep) {
-      error(span, "#elif%sdef after #else", &"n"[defp]);
-      return;
-   }
-   lex0(lx, &tk, 0);
-   if (tk.t != TKIDENT) {
-      error(&tk.span, "macro name missing");
-      ppskipline(lx);
-      return;
-   }
-   expecteol(lx, defp ? "elifdef" : "elifndef");
-   switch (cnd->cnd) {
-   case PPCNDTRUE: cnd->cnd = PPCNDTAKEN; break;
-   case PPCNDFALSE: cnd->cnd = (findmac(tk.name) == NULL) ^ defp ? PPCNDTRUE : PPCNDFALSE; break;
-   case PPCNDTAKEN: assert(0);
-   }
-}
-
-static void
-ppendif(struct lexer *lx, const struct span *span)
-{
-   expecteol(lx, "endif");
-   if (!nppcnd) {
-      error(span, "#endif without matching #if");
-      return;
-   }
-   --nppcnd;
-}
-
-static void
-ppelse(struct lexer *lx, const struct span *span)
-{
-   struct ppcnd *cnd;
-   expecteol(lx, "else");
-   if (!nppcnd) {
-      error(span, "#else without matching #if");
-      return;
-   }
-   cnd = &ppcndstk[nppcnd-1];
-   if (cnd->elsep)
-      error(span, "#else after #else");
-   switch (cnd->cnd) {
-   case PPCNDFALSE: cnd->cnd = PPCNDTRUE; break;
-   case PPCNDTRUE: cnd->cnd = PPCNDTAKEN; break;
-   }
-   cnd->elsep = 1;
-}
-
-enum { MAXINCLUDE = 200 };
-static bool
-tryincludepath(struct lexer *lx, const struct span *span, char *path)
-{
-   struct lexer new;
-   const char *err;
-   switch (initlexer(&new, &err, path)) {
-   default: assert(0);
-   case LXERR: return 0;
-   case LXFILESEEN:
-      xbfree(path);
-      /* fallthru */
-   case LXOK:
-      new.save = xmalloc(sizeof *new.save);
-      lx->inclnerror = nerror;
-      lx->inclnwarn = nwarn;
-      memcpy(new.save, lx, sizeof *lx);
-      *lx = new;
-
-      if (++includedepth == MAXINCLUDE)
-         lxfatal(lx, span, "Maximum nested include depth of %d reached", includedepth);
-      break;
-   case LXFILESKIP:
-      xbfree(path);
-      break;
-   }
-   return 1;
-}
-
-static bool
-doinclude(struct lexer *lx, const struct span *span, bool quote, const char *str, size_t slen)
-{
-   char *path = NULL;
-   const char *base, *end;
-   if (quote) {
-      if (str[0] == '/') {
-         /* try absolute path */
-         xbgrow(&path, slen + 1);
-         memcpy(path, str, slen);
-         path[slen] = 0;
-         if (tryincludepath(lx, span, path)) return 1;
-         goto NotFound;
-      }
-
-      /* try relative to current file's directory */
-      base = getfilename(lx->fileid, 0);
-      for (end = base; *end != 0; ++end) {}
-      for (--end; *end != '/' && end != base; --end) {}
-      if (*end == '/') ++end;
-      xbgrow(&path, end - base + slen + 1);
-      memcpy(path, base, end - base);
-      memcpy(path + (end - base), str, slen);
-      path[end - base + slen] = 0;
-      if (tryincludepath(lx, span, path)) return 1;
-   }
-   /* try system paths. order:
-    * 1. -iquote
-    * 2. -I
-    * 3. -isystem
-    * 4. embedded include files
-    * 5. standard system includes
-    * 6. -idirafter
-    */
-   for (int i = quote ? CINCL_iquote : CINCL_I; i < countof(cinclpaths); ++i) {
-      for (struct inclpath *p = cinclpaths[i].list; p; p = p->next) {
-         if (i == CINCLsys) {
-            /* try embedded files pseudo-path */
-            xbgrow(&path, slen + 3);
-            path[0] = '@', path[1] = ':';
-            memcpy(path+2, str, slen);
-            path[slen+2] = 0;
-            if (tryincludepath(lx, span, path)) return 1;
-         }
-         int ndir = strlen(p->path);
-         xbgrow(&path, ndir + slen + 2);
-         memcpy(path, p->path, ndir);
-         path[ndir++] = '/';
-         memcpy(path + ndir, str, slen);
-         path[ndir + slen] = 0;
-         if (tryincludepath(lx, span, path)) return 1;
-      }
-   }
-NotFound:
-   error(span, "file not found: %'S", str, slen);
-   xbfree(path);
-   return 0;
-}
-
-static bool
-ppinclude(struct lexer *lx, const struct span *span0)
-{
-   struct token tk;
-   struct span span = *span0;
-
-   if (in_range(lex0(lx, &tk, 1), TKPPHDRH, TKPPHDRQ)) {
-      expecteol(lx, "include");
-      joinspan(&span.ex, tk.span.ex);
-      return doinclude(lx, &span, tk.t == TKPPHDRQ, tk.s, tk.len);
-   } else if (tk.t == '\n' || tk.t == TKEOF) {
-      goto BadSyntax;
-   } else {
-      /* '#include pp-tokens'
-       * gather and expand pp-tokens */
-      struct token tksbuf[8];
-      vec_of(struct token) tks = VINIT(tksbuf, countof(tksbuf));
-      for (;;) {
-         if (!lx->macstk) {
-            if (tryexpand(lx, &tk) == EXPSTACK) continue;
-            vpush(&tks, tk);
-         } else if (advancemacstk(lx, &tk)) {
-            vpush(&tks, tk);
-            continue;
-         }
-         if (lex0(lx, &tk, 0) == '\n' || tk.t == TKEOF) break;
-      }
-      if (tks.n >= 1 && tks.p[0].t == TKSTRLIT) { /* "header.h" */
-         if (tks.n > 1)
-            (ccopt.pedant ? error : warn)(&tks.p[1].span, "extra tokens after #include");
-         joinspan(&span.ex, tks.p[0].span.ex);
-         return doinclude(lx, &span, 1, tks.p[0].s, tks.p[0].len);
-      } else if (tks.n > 2 && tks.p[0].t == '<' && tks.p[tks.n-1].t == '>') { /* <header.h> */
-         /* this is multiple tokens, concatenate them together */
-         char buf[4096];
-         struct wbuf wbuf = MEMBUF(buf, sizeof buf);
-         for (int i = 1; i < tks.n-1; ++i) {
-            struct token *tk = &tks.p[i];
-            bfmt(&wbuf, &" %tk"[!tk->space], tk);
-         }
-         joinspan(&span.ex, tks.p[tks.n-1].span.ex);
-         if (wbuf.err) error(&span, "path too long");
-         else {
-            return doinclude(lx, &span, 0, buf, wbuf.len);
-         }
-      } else {
-      BadSyntax:
-         error(&tk.span, "expected \"header\" or <header>");
-         ppskipline(lx);
-      }
-      vfree(&tks);
-   }
-   return 1;
-}
-
-static void
-ppline(struct lexer *lx, struct token *tk0)
-{
-   struct token tk, tks[2];
-   int ntk = 0;
-   struct span span = tk0->span;
-   bool ext = 0;
-   if (tk0->t == TKNUMLIT) { /* handles GNU-style post preprocessing directive '# n ...' */
-      tks[ntk++] = *tk0;
-      ext = 1;
-   }
-   while (ntk < 2) {
-      if (lx->macstk && advancemacstk(lx, &tk)) {
-         tks[ntk++] = tk;
-         if (lx->macstk->idx >= lx->macstk->rl.n) popmac(lx, 1);
-      } else if (!lx->macstk && (lex0(lx, &tk, 0) == '\n' || tk.t == TKEOF)) {
-         break;
-      } else if (tk.t == TKIDENT && tryexpand(lx, &tk) == EXPSTACK) {
-         continue;
-      } else {
-         tks[ntk++] = tk;
-      }
-   }
-   uvlong lineno = 0;
-   char *file = NULL;
-   if (ntk > 0 && tks[0].t == TKNUMLIT) {
-      if (!parsenumlit(&lineno, NULL, &tks[0], 1) || (lineno == 0 && !ext))
-         goto BadNum;
-      if (lineno >= 1<<(32-SPANFILEBITS)) {
-         warn(&tks[0].span, "ignoring #line number that is too big");
-         lineno = 0;
-         goto Err;
-      }
-   } else {
-   BadNum:
-      error(ntk ? &tks[0].span : &span, "#line requires a positive integer argument");
-   Err:
-      if (lx->macstk || (tk.t != '\n' && tk.t != TKEOF)) ppskipline(lx);
-      return;
-   }
-   if (ntk > 1) {
-      if (tks[1].t == TKSTRLIT && !tks[1].wide) {
-         file = alloc(&globarena, tks[1].len+1, 0);
-         memcpy(file, tks[1].s, tks[1].len);
-         file[tks[1].len] = 0;
-      } else {
-         error(&tks[1].span, "invalid filename for #line directive");
-      }
-   }
-   if (lineno) setfileline(lx->fileid, lx->chridx, lineno, file);
-   if (lx->macstk) {
-      span.sl.off = span.ex.off = lx->chridx;
-      span.sl.len = span.ex.len = 1;
-      ppskipline(lx);
-      if (!ext)
-         (ccopt.pedant ? error : warn)(&span, "extra tokens after #line");
-   } else if (tk.t != '\n' && tk.t != TKEOF) {
-      if (ext) ppskipline(lx);
-      else expecteol(lx, "line");
-   }
-}
-
-static void
-pppragma(struct lexer *lx, const struct span *span0)
-{
-   struct token tk;
-   struct span span = *span0;
-   if (lex0(lx, &tk, 0) == TKIDENT && !strcmp(tk.s, "once")) {
-      markfileonce(lx->fileid, NULL);
-   } else {
-      joinspan(&span.ex, tk.span.ex);
-      warn(&span, "unknown pragma ignored");
-      ppskipline(lx);
-      return;
-   }
-   expecteol(lx, "pragma");
-}
-
-static void
-ppdiag(struct lexer *lx, const struct span *span0, bool err)
-{
-   const uchar *p = getfile(lx->fileid)->p;
-   uint off = lx->chridx, end;
-   ppskipline(lx);
-   end = lx->chridx;
-   while (off < end && aisspace(p[off])) ++off;
-   (err ? error : warn)(span0, "%S", p + off, end - off);
-}
-
-enum directive {
-   PPXXX,
-   /* !sorted */
-   PPDEFINE,
-   PPELIF,
-   PPELIFDEF,
-   PPELIFNDEF,
-   PPELSE,
-   PPENDIF,
-   PPERROR,
-   PPIF,
-   PPIFDEF,
-   PPIFNDEF,
-   PPINCLUDE,
-   PPLINE,
-   PPPRAGMA,
-   PPUNDEF,
-   PPWARNING,
-};
-
-static enum directive
-findppcmd(const struct token *tk)
-{
-   static const char *tab[] = {
-      /* !sorted */
-      "define",
-      "elif",
-      "elifdef",
-      "elifndef",
-      "else",
-      "endif",
-      "error",
-      "if",
-      "ifdef",
-      "ifndef",
-      "include",
-      "line",
-      "pragma",
-      "undef",
-      "warning",
-   };
-   int l = 0, h = countof(tab) - 1, i, cmp;
-   const char *s = tk->s;
-
-   if (tk->t == TKWif) return PPIF;
-   if (tk->t == TKWelse) return PPELSE;
-   /* binary search over sorted array */
-   while (l <= h) {
-      i = (l + h) / 2;
-      cmp = strcmp(tab[i], s);
-      if (cmp < 0) l = i + 1;
-      else if (cmp > 0) h = i - 1;
-      else return i + 1;
-   }
-   return PPXXX;
-}
-
-static void
-identkeyword(struct token *tk)
-{
-#ifdef __GNUC__
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wmissing-braces"
-#endif
-   static const struct {
-      const char *s;
-      struct kw { uchar t, cstd : 4, ext : 1; } kw;
-      const char *alias[2];
-   } kwtab[] = {
-#define _(kw, cstd, ...) { #kw, {TKW##kw, cstd}, __VA_ARGS__ },
-#include "keywords.def"
-#undef _
-   };
-#ifdef __GNUC__
-#pragma GCC diagnostic pop
-#endif
-   static pmap_of(struct kw) kwmap;
-   if (!kwmap.v) {
-      pmap_init(&kwmap, 128);
-      for (int i = 0; i < countof(kwtab); ++i) {
-         struct kw kw = kwtab[i].kw;
-         /* allow future keywords but only if they begin with _ */
-         if (kw.cstd <= ccopt.cstd || kwtab[i].s[0] == '_') {
-            kw.ext = kw.cstd > ccopt.cstd;
-            pmap_set(&kwmap, intern(kwtab[i].s), kw);
-         }
-         for (const char *const *palias = kwtab[i].alias, *const *end = palias+2;
-              palias != end && *palias; ++palias)
-         {
-            pmap_set(&kwmap, intern(*palias), kw);
-         }
-      }
-   }
-   struct kw *kw = pmap_get(&kwmap, tk->name);
-   if (kw) {
-      tk->t = kw->t;
-      tk->extwarn = kw->ext;
-   }
-}
-
-int
-lex(struct lexer *lx, struct token *tk_)
-{
-   struct token tkx[1], *tk;
-   int t;
-
-Begin:
-   assert(tk_ != &lx->peektok);
-   tk = tk_ ? tk_ : tkx;
-   if (lx->peektok.t) {
-      *tk = lx->peektok;
-      memset(&lx->peektok, 0, sizeof lx->peektok);
-      return tk->t;
-   }
-
-   if (lx->macstk) {
-      if (!advancemacstk(lx, tk))
-         goto Begin;
-      if (tk->t == TKIDENT) identkeyword(tk);
-      return tk->t;
-   }
-   bool linebegin = 1,
-        skip = nppcnd ? ppcndstk[nppcnd-1].cnd != PPCNDTRUE : 0,
-        inclerror = 0; /* set when #include header file not found: process other directives then abort */
-   enum directive lastcmd = 0;
-   for (;;) {
-      while ((t = lex0(lx, tk, 0)) == '\n') linebegin = 1;
-      if (t == '#' && linebegin) {
-         if (lex0(lx, tk, 0) == '\n') { }
-         else if (tk->t == TKNUMLIT || tk->t == TKIDENT) {
-            lastcmd = tk->t == TKNUMLIT ? PPLINE : findppcmd(tk);
-            if (nppcnd == lx->nppcnd0) lx->inclguard = NULL;
-            if (!skip) {
-               switch (lastcmd) {
-               case PPXXX: goto BadPP;
-               case PPDEFINE:   ppdefine(lx); break;
-               case PPUNDEF:    ppundef(lx); break;
-               case PPIF:       ppif(lx, &tk->span); break;
-               case PPIFDEF:    ppifxdef(lx, 1, &tk->span); break;
-               case PPIFNDEF:   ppifxdef(lx, 0, &tk->span); break;
-               case PPELIF:     ppelif(lx, &tk->span); break;
-               case PPELIFDEF:  ppelifxdef(lx, 1, &tk->span); break;
-               case PPELIFNDEF: ppelifxdef(lx, 0, &tk->span); break;
-               case PPELSE:     ppelse(lx, &tk->span); break;
-               case PPENDIF:    ppendif(lx, &tk->span); break;
-               case PPLINE:     ppline(lx, tk); break;
-               case PPPRAGMA:   pppragma(lx, &tk->span); break;
-               case PPWARNING:  ppdiag(lx, &tk->span, 0); break;
-               case PPERROR:    ppdiag(lx, &tk->span, 1); break;
-               case PPINCLUDE:  inclerror |= !ppinclude(lx, &tk->span); break;
-               default: assert(0&&"nyi");
-               }
-            } else {
-               switch (lastcmd) {
-               case PPIF: /* increment nesting level */
-               case PPIFDEF:
-               case PPIFNDEF:
-                  assert(nppcnd < countof(ppcndstk) && "too many nested #if");
-                  ppcndstk[nppcnd].ifspan = tk->span.sl;
-                  ppcndstk[nppcnd].cnd = PPCNDTAKEN;
-                  ppcndstk[nppcnd++].elsep = 0;
-                  break;
-               case PPELIF:     ppelif(lx, &tk->span); break;
-               case PPELIFDEF:  ppelifxdef(lx, 1, &tk->span); break;
-               case PPELIFNDEF: ppelifxdef(lx, 0, &tk->span); break;
-               case PPELSE:     ppelse(lx, &tk->span); break;
-               case PPENDIF:    ppendif(lx, &tk->span); break;
-               default: ppskipline(lx); break;
-               }
-            }
-            if (lastcmd != PPINCLUDE)
-               lx->firstdirective = 0;
-            skip = nppcnd ? ppcndstk[nppcnd-1].cnd != PPCNDTRUE : 0;
-         } else {
-            if (!skip) {
-            BadPP:
-               error(&tk->span, "invalid preprocessor directive");
-            }
-            ppskipline(lx);
-         }
-         linebegin = 1;
-      } else {
-         lx->firstdirective = 0;
-         linebegin = 0;
-         if (skip && t != TKEOF)
-            continue;
-         if (tryexpand(lx, tk) == EXPSTACK)
-            goto Begin;
-         if (t == TKEOF && nppcnd && ppcndstk[nppcnd-1].filedepth == includedepth) {
-            struct span span = { ppcndstk[nppcnd-1].ifspan };
-            error(&span, "#if is not matched by #endif");
-         }
-         if (t == TKEOF && lx->save) {
-            /* end of #include'd file, restore previous state */
-            if (lastcmd == PPENDIF && lx->inclguard) {
-               markfileonce(lx->fileid, lx->inclguard);
-            }
-            struct lexer *sv = lx->save;
-            if (sv->inclnerror != nerror || sv->inclnwarn != nwarn) {
-               int line;
-               const char *f = getfilepos(&line, NULL, sv->fileid, sv->chridx-2);
-               note(NULL, "in file included from %s:%d", f, line);
-            }
-            memcpy(lx, sv, sizeof *lx);
-            free(sv);
-            --includedepth;
-            linebegin = 1;
-            lx->firstdirective = 0;
-         } else if (t == TKEOF && inclerror) {
-            break;
-         } else {
-            if (nppcnd == lx->nppcnd0) lx->inclguard = NULL;
-            if (t == TKIDENT) identkeyword(tk);
-            if (!inclerror) return tk->t;
-         }
-      }
-   }
-   assert(inclerror);
-   efmt("Aborting due to previous error(s).\n");
-   exit(1);
-   assert(0);
-}
-
-int
-lexpeek(struct lexer *lx, struct token *tk_)
-{
-   struct token tkx[1], *tk;
-   uint t;
-
-   tk = tk_ ? tk_ : tkx;
-   if ((t = lx->peektok.t)) {
-      *tk = lx->peektok;
-      return t;
-   }
-   t = lex(lx, tk);
-   lx->peektok = *tk;
-   return t;
-}
-
-/* Predefined/builtin macros */
-
-static vec_of(uchar) ppcmdline;
-
-void
-cpppredef(bool undef, const char *cmd)
-{
-   const char *sep = strchr(cmd, '='), *body = sep ? sep+1 : "1";
-   uint namelen = sep ? sep - cmd : strlen(cmd);
-   char line[1024];
-   struct wbuf wbuf = MEMBUF(line, sizeof line);
-   if (!ppcmdline.p) vinit(&ppcmdline, NULL, 1<<10);
-   int n;
-   if (undef)
-      n = bfmt(&wbuf, "#undef %S\n", cmd, namelen);
-   else
-      n = bfmt(&wbuf, "#define %S %s\n", cmd, namelen, body);
-   assert(n <= sizeof line);
-   vpushn(&ppcmdline, line, n);
-}
-
-static void
-mac__file__(struct lexer *lx, struct token *tk)
-{
-   tk->t = TKSTRLIT;
-   tk->s = getfilename(lx->fileid, lx->chridx);
-   tk->wide = 0;
-   tk->len = strlen(tk->s);
-}
-
-static void
-mac__line__(struct lexer *lx, struct token *tk)
-{
-   char buf[20];
-   int line;
-   struct wbuf wbuf = MEMBUF(buf, sizeof buf);
-   getfilepos(&line, NULL, lx->fileid, lx->chridx);
-   bfmt(&wbuf, "%d", line), buf[wbuf.len++] = 0;
-   tk->t = TKNUMLIT;
-   tk->s = alloccopy(lx->tmparena, buf, wbuf.len, 1);
-   tk->len = wbuf.len-1;
-}
-
-#include <time.h>
-
-static void
-mac__date__(struct lexer *lx, struct token *tk)
-{
-   char buf[20];
-   struct wbuf wbuf = MEMBUF(buf, sizeof buf);
-   time_t tm = time(NULL);
-   struct tm *ts = localtime(&tm);
-   tk->t = TKSTRLIT;
-   tk->wide = 0;
-   tk->len = 11;
-   if (ts) {
-      bfmt(&wbuf, "%S %2d %4d%c",
-           &"JanFebMarAprMayJunJulAugSepOctNovDec"[ts->tm_mon*3], 3,
-           ts->tm_mday, 1900+ts->tm_year, 0);
-      assert(wbuf.len == 11+1);
-      tk->s = alloccopy(lx->tmparena, buf, wbuf.len, 1);
-   } else {
-      tk->s = "\?\?\? \?\? \?\?\?\?";
-   }
-}
-
-static void
-mac__time__(struct lexer *lx, struct token *tk)
-{
-   char buf[20];
-   struct wbuf wbuf = MEMBUF(buf, sizeof buf);
-   time_t tm = time(NULL);
-   struct tm *ts = localtime(&tm);
-   tk->t = TKSTRLIT;
-   tk->wide = 0;
-   tk->len = 8;
-   if (ts) {
-      bfmt(&wbuf, "%.2d:%.2d:%.2d%c", ts->tm_hour, ts->tm_min, ts->tm_sec, 0);
-      tk->s = alloccopy(lx->tmparena, buf, wbuf.len, 1);
-      assert(wbuf.len == 8+1);
-   } else {
-      tk->s = "\?\?:\?\?:\?\?";
-   }
-}
-
-static void
-mac__counter__(struct lexer *lx, struct token *tk)
-{
-   char buf[20];
-   struct wbuf wbuf = MEMBUF(buf, sizeof buf);
-   static int counter;
-   bfmt(&wbuf, "%d", counter++), buf[wbuf.len++] = 0;
-   tk->t = TKNUMLIT;
-   tk->s = alloccopy(lx->tmparena, buf, wbuf.len, 1);
-   tk->len = wbuf.len-1;
-}
-
-static void
-mac__has_builtin(struct lexer *lx, struct token *tk, const struct token *args, int narg)
-{
-   extern bool hasbuiltin(const char *, uint n);
-   bool has = 0;
-   tk->t = TKNUMLIT, tk->len = 1;
-   if (narg >= 1) {
-      if (args[0].t == TKIDENT)
-         has = hasbuiltin(args[0].s, args[0].len);
-      else if (in_range(args[0].t, TKWBEGIN_, TKWEND_))
-         has = args[0].len >= sizeof "__builtin_" && !memcmp(args[0].s, "__builtin_", 10);
-      else goto Bad;
-      if (narg != 1)
-         error(&args[1].span, "expected `)' after '%tk'", &args[0]);
-   } else Bad: {
-      error(narg ? &args[0].span : &tk->span, "'__has_builtin' requires an identifier");
-   }
-   tk->s = &"01"[has];
-}
-
-
-static void
-putdef1(const char *name)
-{
-   static const struct token tok_1 = { TKNUMLIT, .s = "1", .len = 1, .litlit = 1 };
-   putmac(intern(name), &(struct macro) {
-      .predef = 1,
-      .single = &tok_1
-   });
-}
-
-static void
-putdefs1(const char *s)
-{
-   for (; *s; s += strlen(s) + 1) putdef1(s);
-}
-
-static void
-addpredefmacros(struct arena **tmparena)
-{
-   static struct token tok_stdc = {TKNUMLIT},
-                       tok_major = {TKNUMLIT, .s = XSTR(ANTCC_VERSION_MAJOR),
-                                              .len = sizeof XSTR(ANTCC_VERSION_MAJOR) - 1},
-                       tok_minor = {TKNUMLIT, .s = XSTR(ANTCC_VERSION_MINOR),
-                                              .len = sizeof XSTR(ANTCC_VERSION_MINOR) - 1},
-                       tok_patch = {TKNUMLIT, .s = XSTR(ANTCC_VERSION_PATCH),
-                                              .len = sizeof XSTR(ANTCC_VERSION_PATCH) - 1};
-   static struct { const char *name; struct macro m; } macs[] = {
-      { "__FILE__", { .predef = 1, .special = 1, .handler = mac__file__ }},
-      { "__LINE__", { .predef = 1, .special = 1, .handler = mac__line__ }},
-      { "__DATE__", { .predef = 1, .special = 1, .handler = mac__date__ }},
-      { "__TIME__", { .predef = 1, .special = 1, .handler = mac__time__ }},
-      { "__COUNTER__", { .predef = 1, .special = 1, .handler = mac__counter__ }},
-      { "__has_builtin", { .predef = 1, .nparam = 1, .fnlike = 1, .special = 1, .handlerfn = mac__has_builtin }},
-      { "__STDC_VERSION__", { .predef = 1, .single = &tok_stdc }},
-      { "__antcc_major__", { .predef = 1, .single = &tok_major }},
-      { "__antcc_minor__", { .predef = 1, .single = &tok_minor }},
-      { "__antcc_patch__", { .predef = 1, .single = &tok_patch }},
-      { "__extension__", { .predef = 1, .single = NULL }},
-   };
-   static const char
-      cpredefs[] =
-         "__antcc__\0__STDC__\0__STDC_NO_ATOMICS__\0__STDC_NO_COMPLEX__\0__STDC_NO_THREADS__\0__STDC_NO_VLA__\0",
-      *ospredefs[] = {
-         [OSlinux] = "__linux\0__linux__\0linux\0unix\0__unix\0__unix__\0"
-      }, *archpredefs[] = {
-         [ISx86_64] = "__x86_64__\0__x86_64\0",
-         [ISaarch64] = "__aarch64__\0__aarch64\0",
-      }, cstdver[][8] = {
-         [STDC89] = "199409L",
-         [STDC99] = "199901L",
-         [STDC11] = "201112L",
-         [STDC23] = "202311L",
-      };
-
-   tok_stdc.s = cstdver[ccopt.cstd];
-   tok_stdc.len = 7;
-
-   for (int i = 0; i < countof(macs); ++i)
-      putmac(intern(macs[i].name), &macs[i].m);
-   putdefs1(cpredefs);
-   if (target.os != OSunknown) putdef1("__STDC_HOSTED__");
-   putdefs1(ospredefs[target.os]);
-   putdefs1(archpredefs[target.arch]);
-
-   if (ppcmdline.n) {
-      struct memfile *f;
-      struct lexer lx[1] = {0};
-      lx->fileid = getpredeffile(&f, "<command line>");
-      assert(!f->p);
-      lx->ndat = f->n = ppcmdline.n;
-      vpushn(&ppcmdline, "\0\0\0\0\0\0", 6);
-      lx->dat = f->p = ppcmdline.p;
-      lx->tmparena = tmparena;
-      lx->chrbuf0 = countof(lx->chrbuf);
-      lx->firstdirective = 1;
-      while (lex(lx, NULL) != TKEOF) ;
-   }
-}
-
-enum initlexer
-initlexer(struct lexer *lx, const char **err, const char *file)
-{
-   enum { NARENA = 1<<12 };
-   static union { char m[sizeof(struct arena) + NARENA]; struct arena *_align; } amem;
-   static struct arena *tmparena = (void *)amem.m;
-
-   if (!tmparena->cap) tmparena->cap = NARENA;
-   if (!mtoksbuf.p) vinit(&mtoksbuf, NULL, 1024);
-   if (!mdyntoksbuf.p) vinit(&mdyntoksbuf, NULL, 256);
-   if (!macroht.v) addpredefmacros(&tmparena);
-
-   struct memfile *f;
-   int fileid = openfile(err, &f, file);
-   if (fileid < 0)
-      return LXERR;
-   internstr guard;
-   if (isfileseen(fileid) && isoncefile(fileid, &guard) && (!guard || findmac(guard))) {
-      //efmt("skipping %s .. guard %s\n", file, guard ? guard : "<none>");
-      return LXFILESKIP;
-   }
-   memset(lx, 0, sizeof *lx);
-   lx->fileid = fileid;
-   markfileseen(fileid);
-
-   lx->dat = f->p;
-   lx->ndat = f->n;
-   lx->tmparena = &tmparena;
-   lx->chrbuf0 = countof(lx->chrbuf);
-   lx->firstdirective = 1;
-   lx->nppcnd0 = nppcnd;
-   return getfilename(fileid, 0) != file ? LXFILESEEN : LXOK;
-}
-
-/* callback to let lexer release temp memory for arena allocated token data */
-void
-lexerfreetemps(struct lexer *lx)
-{
-   if (!lx->macstk) {
-      /* some of the tokens could be somewhere in the macro stack */
-      freearena(lx->tmparena);
-   }
-}
-
-void
-lexerdump(struct lexer *lx, struct wbuf *out)
-{
-   struct token prev = {0}, tok;
-   int file = lx->fileid, line = 1, col = 1;
-   const char *lastfile = getfilename(file, 0);
-   bfmt(out, "# %d %'s\n", 1, lastfile);
-   while (lex(lx, &tok) != TKEOF) {
-      int tkline, tkcol;
-      const char *fname = getfilepos(&tkline, &tkcol, tok.span.ex.file, tok.span.ex.off);
-      if (tok.span.ex.file != file || fname != lastfile) {
-         file = tok.span.ex.file;
-         bfmt(out, "\n# %d %'s\n", tkline, fname);
-         col = 1;
-         lexerfreetemps(lx);
-         lastfile = fname;
-      } else if (line < tkline && tkline - line < 5) {
-         do
-            ioputc(out, '\n');
-         while (++line != tkline);
-         col = 1;
-      } else if (line != tkline) {
-         bfmt(out, "\n# %d\n", tkline);
-         line = tkline;
-         col = 1;
-         lexerfreetemps(lx);
-      } else if (prev.t && (tok.space || tokpaste(lx, NULL, &prev, &tok))) {
-         /* preserve whitespace & paste avoidance */
-         ioputc(out, ' ');
-         ++col;
-      }
-      if (col == 1)
-         for (; col < tkcol; ++col)
-            ioputc(out, ' ');
-      line = tkline;
-      bfmt(out, "%tk", &tok);
-      col += tok.span.ex.len;
-      prev = tok;
-   }
-   bfmt(out, "\n");
-   ioflush(out);
-}
-
-/* vim:set ts=3 sw=3 expandtab: */