gcc/gengtype-lex.l

   1 /* -*- indented-text -*- */
   2 /* Process source files and output type information.
   3    Copyright (C) 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 %{
  22 #include "bconfig.h"
  23 #include "system.h"
  24
  25 #define malloc xmalloc
  26 #define realloc xrealloc
  27
  28 #include "gengtype.h"
  29
  30 #define YY_DECL int yylex (const char **yylval)
  31 #define yyterminate() return EOF_TOKEN
  32
  33 struct fileloc lexer_line;
  34 int lexer_toplevel_done;
  35
  36 static void
  37 update_lineno (const char *l, size_t len)
  38 {
  39   while (len-- > 0)
  40     if (*l++ == '\n')
  41       lexer_line.line++;
  42 }
  43
  44 %}
  45
  46 ID      [[:alpha:]_][[:alnum:]_]*
  47 WS      [[:space:]]+
  48 HWS     [ \t\r\v\f]*
  49 IWORD   short|long|(un)?signed|char|int|HOST_WIDE_INT|HOST_WIDEST_INT|bool|size_t|BOOL_BITFIELD|CPPCHAR_SIGNED_T|ino_t|dev_t
  50 ITYPE   {IWORD}({WS}{IWORD})*
  51 EOID    [^[:alnum:]_]
  52
  53 %x in_struct in_struct_comment in_comment
  54 %option warn noyywrap nounput nodefault perf-report
  55 %option 8bit never-interactive
  56 %%
  57   /* Do this on entry to yylex():  */
  58   *yylval = 0;
  59   if (lexer_toplevel_done)
  60     {
  61       BEGIN(INITIAL);
  62       lexer_toplevel_done = 0;
  63     }
  64
  65   /* Things we look for in skipping mode: */
  66 <INITIAL>{
  67 ^{HWS}typedef/{EOID} {
  68   BEGIN(in_struct);
  69   return TYPEDEF;
  70 }
  71 ^{HWS}struct/{EOID} {
  72   BEGIN(in_struct);
  73   return STRUCT;
  74 }
  75 ^{HWS}union/{EOID} {
  76   BEGIN(in_struct);
  77   return UNION;
  78 }
  79 ^{HWS}extern/{EOID} {
  80   BEGIN(in_struct);
  81   return EXTERN;
  82 }
  83 ^{HWS}static/{EOID} {
  84   BEGIN(in_struct);
  85   return STATIC;
  86 }
  87
  88 ^{HWS}DEF_VEC_[OP]/{EOID} {
  89   BEGIN(in_struct);
  90   return DEFVEC_OP;
  91 }
  92 ^{HWS}DEF_VEC_I/{EOID} {
  93   BEGIN(in_struct);
  94   return DEFVEC_I;
  95 }
  96 ^{HWS}DEF_VEC_ALLOC_[IOP]/{EOID} {
  97   BEGIN(in_struct);
  98   return DEFVEC_ALLOC;
  99 }
 100 }
 101
 102 <in_struct>{
 103
 104 "/*"                            { BEGIN(in_struct_comment); }
 105
 106 {WS}                            { update_lineno (yytext, yyleng); }
 107 \\\n                            { lexer_line.line++; }
 108
 109 "const"/{EOID}                  /* don't care */
 110 "GTY"/{EOID}                    { return GTY_TOKEN; }
 111 "VEC"/{EOID}                    { return VEC_TOKEN; }
 112 "union"/{EOID}                  { return UNION; }
 113 "struct"/{EOID}                 { return STRUCT; }
 114 "enum"/{EOID}                   { return ENUM; }
 115 "ptr_alias"/{EOID}              { return PTR_ALIAS; }
 116 "nested_ptr"/{EOID}             { return NESTED_PTR; }
 117 [0-9]+                          { return NUM; }
 118 "param"[0-9]*"_is"/{EOID}               {
 119   *yylval = XDUPVAR (const char, yytext, yyleng, yyleng+1);
 120   return PARAM_IS;
 121 }
 122
 123 {IWORD}({WS}{IWORD})*/{EOID}            |
 124 "ENUM_BITFIELD"{WS}?"("{WS}?{ID}{WS}?")"        {
 125   size_t len;
 126
 127   for (len = yyleng; ISSPACE (yytext[len-1]); len--)
 128     ;
 129
 130   *yylval = XDUPVAR (const char, yytext, len, len+1);
 131   update_lineno (yytext, yyleng);
 132   return SCALAR;
 133 }
 134
 135
 136 {ID}/{EOID}                     {
 137   *yylval = XDUPVAR (const char, yytext, yyleng, yyleng+1);
 138   return ID;
 139 }
 140
 141 \"([^"\\]|\\.)*\"               {
 142   *yylval = XDUPVAR (const char, yytext+1, yyleng-2, yyleng-1);
 143   return STRING;
 144 }
 145   /* This "terminal" avoids having to parse integer constant expressions.  */
 146 "["[^\[\]]*"]"                  {
 147   *yylval = XDUPVAR (const char, yytext+1, yyleng-2, yyleng-1);
 148   return ARRAY;
 149 }
 150 "'"("\\".|[^\\])"'"             {
 151   *yylval = XDUPVAR (const char, yytext+1, yyleng-2, yyleng);
 152   return CHAR;
 153 }
 154
 155 "..."                           { return ELLIPSIS; }
 156 [(){},*:<>;=%|-]                { return yytext[0]; }
 157
 158    /* ignore pp-directives */
 159 ^{HWS}"#"{HWS}[a-z_]+[^\n]*\n   {lexer_line.line++;}
 160
 161 .                               {
 162   error_at_line (&lexer_line, "unexpected character `%s'", yytext);
 163 }
 164 }
 165
 166 "/*"                    { BEGIN(in_comment); }
 167 \n                      { lexer_line.line++; }
 168 {ID}                    |
 169 "'"("\\".|[^\\])"'"     |
 170 [^"/\n]                 /* do nothing */
 171 \"([^"\\]|\\.|\\\n)*\"  { update_lineno (yytext, yyleng); }
 172 "/"/[^*]                /* do nothing */
 173
 174 <in_comment,in_struct_comment>{
 175 \n              { lexer_line.line++; }
 176 [^*\n]{16}      |
 177 [^*\n]          /* do nothing */
 178 "*"/[^/]        /* do nothing */
 179 }
 180 <in_comment>"*/"        { BEGIN(INITIAL); }
 181 <in_struct_comment>"*/" { BEGIN(in_struct); }
 182
 183 ["/]                    |
 184 <in_struct_comment,in_comment>"*"       {
 185   error_at_line (&lexer_line,
 186                  "unterminated comment or string; unexpected EOF");
 187 }
 188
 189 ^{HWS}"#"{HWS}"define"{WS}"GTY(" /* do nothing */
 190 {WS}"GTY"{WS}?"("       {
 191   error_at_line (&lexer_line, "stray GTY marker");
 192 }
 193
 194 %%
 195
 196 void
 197 yybegin (const char *fname)
 198 {
 199   yyin = fopen (fname, "r");
 200   if (yyin == NULL)
 201     {
 202       perror (fname);
 203       exit (1);
 204     }
 205   lexer_line.file = fname;
 206   lexer_line.line = 1;
 207 }
 208
 209 void
 210 yyend (void)
 211 {
 212   fclose (yyin);
 213 }