gcc/gengtype-lex.l

   1 /* -*- indented-text -*- */
   2 /* Process source files and output type information.
   3    Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 %option noinput
  23
  24 %{
  25 #ifdef GENERATOR_FILE
  26 #include "bconfig.h"
  27 #else
  28 #include "config.h"
  29 #endif
  30 #include "system.h"
  31
  32 #define malloc xmalloc
  33 #define realloc xrealloc
  34
  35 #include "gengtype.h"
  36
  37 #define YY_DECL int yylex (const char **yylval)
  38 #define yyterminate() return EOF_TOKEN
  39
  40 struct fileloc lexer_line;
  41 int lexer_toplevel_done;
  42
  43 static void
  44 update_lineno (const char *l, size_t len)
  45 {
  46   while (len-- > 0)
  47     if (*l++ == '\n')
  48       lexer_line.line++;
  49 }
  50
  51 %}
  52
  53 ID      [[:alpha:]_][[:alnum:]_]*
  54 WS      [[:space:]]+
  55 HWS     [ \t\r\v\f]*
  56 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|HARD_REG_SET
  57 ITYPE   {IWORD}({WS}{IWORD})*
  58 EOID    [^[:alnum:]_]
  59
  60 %x in_struct in_struct_comment in_comment
  61 %option warn noyywrap nounput nodefault perf-report
  62 %option 8bit never-interactive
  63 %%
  64   /* Do this on entry to yylex():  */
  65   *yylval = 0;
  66   if (lexer_toplevel_done)
  67     {
  68       BEGIN(INITIAL);
  69       lexer_toplevel_done = 0;
  70     }
  71
  72   /* Things we look for in skipping mode: */
  73 <INITIAL>{
  74 ^{HWS}typedef/{EOID} {
  75   BEGIN(in_struct);
  76   return TYPEDEF;
  77 }
  78 ^{HWS}struct/{EOID} {
  79   BEGIN(in_struct);
  80   return STRUCT;
  81 }
  82 ^{HWS}union/{EOID} {
  83   BEGIN(in_struct);
  84   return UNION;
  85 }
  86 ^{HWS}extern/{EOID} {
  87   BEGIN(in_struct);
  88   return EXTERN;
  89 }
  90 ^{HWS}static/{EOID} {
  91   BEGIN(in_struct);
  92   return STATIC;
  93 }
  94
  95 ^{HWS}DEF_VEC_[OP]/{EOID} {
  96   BEGIN(in_struct);
  97   return DEFVEC_OP;
  98 }
  99 ^{HWS}DEF_VEC_I/{EOID} {
 100   BEGIN(in_struct);
 101   return DEFVEC_I;
 102 }
 103 ^{HWS}DEF_VEC_ALLOC_[IOP]/{EOID} {
 104   BEGIN(in_struct);
 105   return DEFVEC_ALLOC;
 106 }
 107 }
 108
 109 <in_struct>{
 110
 111 "/*"                            { BEGIN(in_struct_comment); }
 112
 113 {WS}                            { update_lineno (yytext, yyleng); }
 114 \\\n                            { lexer_line.line++; }
 115
 116 "const"/{EOID}                  /* don't care */
 117 "GTY"/{EOID}                    { return GTY_TOKEN; }
 118 "VEC"/{EOID}                    { return VEC_TOKEN; }
 119 "union"/{EOID}                  { return UNION; }
 120 "struct"/{EOID}                 { return STRUCT; }
 121 "enum"/{EOID}                   { return ENUM; }
 122 "ptr_alias"/{EOID}              { return PTR_ALIAS; }
 123 "nested_ptr"/{EOID}             { return NESTED_PTR; }
 124 [0-9]+                          { return NUM; }
 125 "param"[0-9]*"_is"/{EOID}               {
 126   *yylval = XDUPVAR (const char, yytext, yyleng, yyleng+1);
 127   return PARAM_IS;
 128 }
 129
 130 {IWORD}({WS}{IWORD})*/{EOID}            |
 131 "ENUM_BITFIELD"{WS}?"("{WS}?{ID}{WS}?")"        {
 132   size_t len;
 133
 134   for (len = yyleng; ISSPACE (yytext[len-1]); len--)
 135     ;
 136
 137   *yylval = XDUPVAR (const char, yytext, len, len+1);
 138   update_lineno (yytext, yyleng);
 139   return SCALAR;
 140 }
 141
 142
 143 {ID}/{EOID}                     {
 144   *yylval = XDUPVAR (const char, yytext, yyleng, yyleng+1);
 145   return ID;
 146 }
 147
 148 \"([^"\\]|\\.)*\"               {
 149   *yylval = XDUPVAR (const char, yytext+1, yyleng-2, yyleng-1);
 150   return STRING;
 151 }
 152   /* This "terminal" avoids having to parse integer constant expressions.  */
 153 "["[^\[\]]*"]"                  {
 154   *yylval = XDUPVAR (const char, yytext+1, yyleng-2, yyleng-1);
 155   return ARRAY;
 156 }
 157 "'"("\\".|[^\\])"'"             {
 158   *yylval = XDUPVAR (const char, yytext+1, yyleng-2, yyleng);
 159   return CHAR;
 160 }
 161
 162 "..."                           { return ELLIPSIS; }
 163 [(){},*:<>;=%|-]                { return yytext[0]; }
 164
 165    /* ignore pp-directives */
 166 ^{HWS}"#"{HWS}[a-z_]+[^\n]*\n   {lexer_line.line++;}
 167
 168 .                               {
 169   error_at_line (&lexer_line, "unexpected character `%s'", yytext);
 170 }
 171 }
 172
 173 "/*"                    { BEGIN(in_comment); }
 174 \n                      { lexer_line.line++; }
 175 {ID}                    |
 176 "'"("\\".|[^\\])"'"     |
 177 [^"/\n]                 /* do nothing */
 178 \"([^"\\]|\\.|\\\n)*\"  { update_lineno (yytext, yyleng); }
 179 "/"/[^*]                /* do nothing */
 180
 181 <in_comment,in_struct_comment>{
 182 \n              { lexer_line.line++; }
 183 [^*\n]{16}      |
 184 [^*\n]          /* do nothing */
 185 "*"/[^/]        /* do nothing */
 186 }
 187 <in_comment>"*/"        { BEGIN(INITIAL); }
 188 <in_struct_comment>"*/" { BEGIN(in_struct); }
 189
 190 ["/]                    |
 191 <in_struct_comment,in_comment>"*"       {
 192   error_at_line (&lexer_line,
 193                  "unterminated comment or string; unexpected EOF");
 194 }
 195
 196 ^{HWS}"#"{HWS}"define"{WS}"GTY(" /* do nothing */
 197
 198 %%
 199
 200 void
 201 yybegin (const char *fname)
 202 {
 203   yyin = fopen (fname, "r");
 204   if (yyin == NULL)
 205     {
 206       perror (fname);
 207       exit (1);
 208     }
 209   lexer_line.file = input_file_by_name (fname);
 210   lexer_line.line = 1;
 211 }
 212
 213 void
 214 yyend (void)
 215 {
 216   fclose (yyin);
 217 }