.

[bison.git] / src / lex.c

diff --git a/src/lex.c b/src/lex.c
index f81e291036c9b0913bd6bb4bf944e74f2d172ffd..4bd0a6f26344d4fbc883b38f6c5543166255b27a 100644 (file)
--- a/src/lex.c
+++ b/src/lex.c
@@ -1,5 +1,5 @@
 /* Token-reader for Bison's input parser,
 /* Token-reader for Bison's input parser,

-   Copyright (C) 1984, 1986, 1989, 1992, 2000 Free Software Foundation, Inc.
+   Copyright 1984, 1986, 1989, 1992, 2000, 2001 Free Software Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 


@@ -30,10 +30,8 @@
 #include "quote.h"
 
 /* Buffer for storing the current token.  */
 #include "quote.h"
 
 /* Buffer for storing the current token.  */

-char *token_buffer;
-
-/* Allocated size of token_buffer, not including space for terminator.  */
-int maxtoken;
+struct obstack token_obstack;
+const char *token_buffer = NULL;

 
 bucket *symval;
 int numval;
 
 bucket *symval;
 int numval;


@@ -45,22 +43,11 @@ static bucket *unlexed_symval;      /* by the next call to lex */
 void
 init_lex (void)
 {
 void
 init_lex (void)
 {

-  maxtoken = 100;
-  token_buffer = XCALLOC (char, maxtoken + 1);
+  obstack_init (&token_obstack);

   unlexed = -1;
 }
 
 
   unlexed = -1;
 }
 
 

-char *
-grow_token_buffer (char *p)
-{
-  int offset = p - token_buffer;
-  maxtoken *= 2;
-  token_buffer = XREALLOC (token_buffer, char, maxtoken + 1);
-  return token_buffer + offset;
-}
-
-

 int
 skip_white_space (void)
 {
 int
 skip_white_space (void)
 {


@@ -76,6 +63,7 @@ skip_white_space (void)
       switch (c)
        {
        case '/':
       switch (c)
        {
        case '/':

+         /* FIXME: Should probably be merged with copy_comment.  */

          c = getc (finput);
          if (c != '*' && c != '/')
            {
          c = getc (finput);
          if (c != '*' && c != '/')
            {


@@ -130,7 +118,11 @@ skip_white_space (void)
     }
 }
 
     }
 }
 

-/* do a getc, but give error message if EOF encountered */
+
+/*-----------------------------------------------------.
+| Do a getc, but give error message if EOF encountered |
+`-----------------------------------------------------*/
+

 static int
 xgetc (FILE *f)
 {
 static int
 xgetc (FILE *f)
 {


@@ -143,16 +135,22 @@ xgetc (FILE *f)
 
 /*------------------------------------------------------------------.
 | Read one literal character from finput.  Process \ escapes.       |
 
 /*------------------------------------------------------------------.
 | Read one literal character from finput.  Process \ escapes.       |

-| Append the normalized string version of the char to *PP.  Assign  |
+| Append the normalized string version of the char to OUT.  Assign  |

 | the character code to *PCODE. Return 1 unless the character is an |
 | the character code to *PCODE. Return 1 unless the character is an |

-| unescaped `term' or \n report error for \n                        |
+| unescaped `term' or \n report error for \n.                       |

 `------------------------------------------------------------------*/
 
 `------------------------------------------------------------------*/
 

+/* FIXME: We could directly work in the obstack, but that would make
+   it more difficult to move to quotearg some day.  So for the time
+   being, I prefer have literalchar behave like quotearg, and change
+   my mind later if I was wrong.  */
+

 static int
 static int

-literalchar (char **pp, int *pcode, char term)
+literalchar (struct obstack *out, int *pcode, char term)

 {
   int c;
 {
   int c;

-  char *p;
+  char buf[4096];
+  char *cp;

   int code;
   int wasquote = 0;
 
   int code;
   int wasquote = 0;
 


@@ -236,76 +234,79 @@ literalchar (char **pp, int *pcode, char term)
        }
       else
        {
        }
       else
        {

-         char buf [] = "c";
-         buf[0] = c;
+         char badchar [] = "c";
+         badchar[0] = c;

          complain (_("unknown escape sequence: `\\' followed by `%s'"),
          complain (_("unknown escape sequence: `\\' followed by `%s'"),

-                   quote (buf));
+                   quote (badchar));

          code = '?';
        }
     }                          /* has \ */
 
          code = '?';
        }
     }                          /* has \ */
 

-  /* now fill token_buffer with the canonical name for this character
-     as a literal token.  Do not use what the user typed,
-     so that `\012' and `\n' can be interchangeable.  */
+  /* now fill BUF with the canonical name for this character as a
+     literal token.  Do not use what the user typed, so that `\012'
+     and `\n' can be interchangeable.  */

 
 

-  p = *pp;
+  cp = buf;

   if (code == term && wasquote)
   if (code == term && wasquote)

-    *p++ = code;
+    *cp++ = code;

   else if (code == '\\')
     {
   else if (code == '\\')
     {

-      *p++ = '\\';
-      *p++ = '\\';
+      *cp++ = '\\';
+      *cp++ = '\\';

     }
   else if (code == '\'')
     {
     }
   else if (code == '\'')
     {

-      *p++ = '\\';
-      *p++ = '\'';
+      *cp++ = '\\';
+      *cp++ = '\'';

     }
   else if (code == '\"')
     {
     }
   else if (code == '\"')
     {

-      *p++ = '\\';
-      *p++ = '\"';
+      *cp++ = '\\';
+      *cp++ = '\"';

     }
   else if (code >= 040 && code < 0177)
     }
   else if (code >= 040 && code < 0177)

-    *p++ = code;
+    *cp++ = code;

   else if (code == '\t')
     {
   else if (code == '\t')
     {

-      *p++ = '\\';
-      *p++ = 't';
+      *cp++ = '\\';
+      *cp++ = 't';

     }
   else if (code == '\n')
     {
     }
   else if (code == '\n')
     {

-      *p++ = '\\';
-      *p++ = 'n';
+      *cp++ = '\\';
+      *cp++ = 'n';

     }
   else if (code == '\r')
     {
     }
   else if (code == '\r')
     {

-      *p++ = '\\';
-      *p++ = 'r';
+      *cp++ = '\\';
+      *cp++ = 'r';

     }
   else if (code == '\v')
     {
     }
   else if (code == '\v')
     {

-      *p++ = '\\';
-      *p++ = 'v';
+      *cp++ = '\\';
+      *cp++ = 'v';

     }
   else if (code == '\b')
     {
     }
   else if (code == '\b')
     {

-      *p++ = '\\';
-      *p++ = 'b';
+      *cp++ = '\\';
+      *cp++ = 'b';

     }
   else if (code == '\f')
     {
     }
   else if (code == '\f')
     {

-      *p++ = '\\';
-      *p++ = 'f';
+      *cp++ = '\\';
+      *cp++ = 'f';

     }
   else
     {
     }
   else
     {

-      *p++ = '\\';
-      *p++ = code / 0100 + '0';
-      *p++ = ((code / 010) & 07) + '0';
-      *p++ = (code & 07) + '0';
+      *cp++ = '\\';
+      *cp++ = code / 0100 + '0';
+      *cp++ = ((code / 010) & 07) + '0';
+      *cp++ = (code & 07) + '0';

     }
     }

-  *pp = p;
+  *cp = '\0';
+
+  if (out)
+    obstack_sgrow (out, buf);

   *pcode = code;
   return !wasquote;
 }
   *pcode = code;
   return !wasquote;
 }


@@ -318,12 +319,42 @@ unlex (int token)
   unlexed_symval = symval;
 }
 
   unlexed_symval = symval;
 }
 

+/*-----------------------------------------------------------------.
+| We just read `<' from FIN.  Store in TOKEN_BUFFER, the type name |
+| specified between the `<...>'.                                   |
+`-----------------------------------------------------------------*/

 
 

-int
+void
+read_type_name (FILE *fin)
+{
+  int c = getc (fin);
+
+  while (c != '>')
+    {
+      if (c == EOF)
+       fatal (_("unterminated type name at end of file"));
+      if (c == '\n')
+       {
+         complain (_("unterminated type name"));
+         ungetc (c, fin);
+         break;
+       }
+
+      obstack_1grow (&token_obstack, c);
+      c = getc (fin);
+    }
+  obstack_1grow (&token_obstack, '\0');
+  token_buffer = obstack_finish (&token_obstack);
+}
+
+
+token_t

 lex (void)
 {
   int c;
 lex (void)
 {
   int c;

-  char *p;
+
+  /* Just to make sure. */
+  token_buffer = NULL;

 
   if (unlexed >= 0)
     {
 
   if (unlexed >= 0)
     {


@@ -334,14 +365,12 @@ lex (void)
     }
 
   c = skip_white_space ();
     }
 
   c = skip_white_space ();

-  *token_buffer = c;           /* for error messages (token buffer always valid) */
-  token_buffer[1] = 0;

 
   switch (c)
     {
     case EOF:
 
   switch (c)
     {
     case EOF:

-      strcpy (token_buffer, "EOF");
-      return ENDFILE;
+      token_buffer = "EOF";
+      return tok_eof;

 
     case 'A':    case 'B':    case 'C':    case 'D':    case 'E':
     case 'F':    case 'G':    case 'H':    case 'I':    case 'J':
 
     case 'A':    case 'B':    case 'C':    case 'D':    case 'E':
     case 'F':    case 'G':    case 'H':    case 'I':    case 'J':


@@ -357,39 +386,32 @@ lex (void)
     case 'z':
     case '.':    case '_':
 
     case 'z':
     case '.':    case '_':
 

-      p = token_buffer;

       while (isalnum (c) || c == '_' || c == '.')
        {
       while (isalnum (c) || c == '_' || c == '.')
        {

-         if (p == token_buffer + maxtoken)
-           p = grow_token_buffer (p);
-
-         *p++ = c;
+         obstack_1grow (&token_obstack, c);

          c = getc (finput);
        }
          c = getc (finput);
        }

-
-      *p = 0;
+      obstack_1grow (&token_obstack, '\0');
+      token_buffer = obstack_finish (&token_obstack);

       ungetc (c, finput);
       symval = getsym (token_buffer);
       ungetc (c, finput);
       symval = getsym (token_buffer);

-      return IDENTIFIER;
+      return tok_identifier;

 
     case '0':    case '1':    case '2':    case '3':    case '4':
     case '5':    case '6':    case '7':    case '8':    case '9':
       {
        numval = 0;
 
 
     case '0':    case '1':    case '2':    case '3':    case '4':
     case '5':    case '6':    case '7':    case '8':    case '9':
       {
        numval = 0;
 

-       p = token_buffer;

        while (isdigit (c))
          {
        while (isdigit (c))
          {

-           if (p == token_buffer + maxtoken)
-             p = grow_token_buffer (p);
-
-           *p++ = c;
+           obstack_1grow (&token_obstack, c);

            numval = numval * 10 + c - '0';
            c = getc (finput);
          }
            numval = numval * 10 + c - '0';
            c = getc (finput);
          }

-       *p = 0;
+       obstack_1grow (&token_obstack, '\0');
+       token_buffer = obstack_finish (&token_obstack);

        ungetc (c, finput);
        ungetc (c, finput);

-       return NUMBER;
+       return tok_number;

       }
 
     case '\'':
       }
 
     case '\'':


@@ -398,30 +420,26 @@ lex (void)
       translations = -1;
       {
        int code, discode;
       translations = -1;
       {
        int code, discode;

-       char discard[10], *dp;

 
 

-       p = token_buffer;
-       *p++ = '\'';
-       literalchar (&p, &code, '\'');
+       obstack_1grow (&token_obstack, '\'');
+       literalchar (&token_obstack, &code, '\'');

 
        c = getc (finput);
        if (c != '\'')
          {
            complain (_("use \"...\" for multi-character literal tokens"));
            while (1)
 
        c = getc (finput);
        if (c != '\'')
          {
            complain (_("use \"...\" for multi-character literal tokens"));
            while (1)

-             {
-               dp = discard;
-               if (!literalchar (&dp, &discode, '\''))
-                 break;
-             }
+             if (!literalchar (0, &discode, '\''))
+               break;

          }
          }

-       *p++ = '\'';
-       *p = 0;
+       obstack_1grow (&token_obstack, '\'');
+       obstack_1grow (&token_obstack, '\0');
+       token_buffer = obstack_finish (&token_obstack);

        symval = getsym (token_buffer);
        symval->class = token_sym;
        if (!symval->user_token_number)
          symval->user_token_number = code;
        symval = getsym (token_buffer);
        symval->class = token_sym;
        if (!symval->user_token_number)
          symval->user_token_number = code;

-       return IDENTIFIER;
+       return tok_identifier;

       }
 
     case '\"':
       }
 
     case '\"':


@@ -430,35 +448,34 @@ lex (void)
       translations = -1;
       {
        int code;               /* ignored here */
       translations = -1;
       {
        int code;               /* ignored here */

-       p = token_buffer;
-       *p++ = '\"';
-       while (literalchar (&p, &code, '\"'))   /* read up to and including " */
-         {
-           if (p >= token_buffer + maxtoken - 4)
-             p = grow_token_buffer (p);
-         }
-       *p = 0;
+
+       obstack_1grow (&token_obstack, '\"');
+       /* Read up to and including ".  */
+       while (literalchar (&token_obstack, &code, '\"'))
+         /* nothing */;
+       obstack_1grow (&token_obstack, '\0');
+       token_buffer = obstack_finish (&token_obstack);

 
        symval = getsym (token_buffer);
        symval->class = token_sym;
 
 
        symval = getsym (token_buffer);
        symval->class = token_sym;
 

-       return IDENTIFIER;
+       return tok_identifier;

       }
 
     case ',':
       }
 
     case ',':

-      return COMMA;
+      return tok_comma;

 
     case ':':
 
     case ':':

-      return COLON;
+      return tok_colon;

 
     case ';':
 
     case ';':

-      return SEMICOLON;
+      return tok_semicolon;

 
     case '|':
 
     case '|':

-      return BAR;
+      return tok_bar;

 
     case '{':
 
     case '{':

-      return LEFT_CURLY;
+      return tok_left_curly;

 
     case '=':
       do
 
     case '=':
       do


@@ -471,44 +488,24 @@ lex (void)
 
       if (c == '{')
        {
 
       if (c == '{')
        {

-         strcpy (token_buffer, "={");
-         return LEFT_CURLY;
+         token_buffer = "={";
+         return tok_left_curly;

        }
       else
        {
          ungetc (c, finput);
        }
       else
        {
          ungetc (c, finput);

-         return ILLEGAL;
+         return tok_illegal;

        }
 
     case '<':
        }
 
     case '<':

-      p = token_buffer;
-      c = getc (finput);
-      while (c != '>')
-       {
-         if (c == EOF)
-           fatal (_("unterminated type name at end of file"));
-         if (c == '\n')
-           {
-             complain (_("unterminated type name"));
-             ungetc (c, finput);
-             break;
-           }
-
-         if (p == token_buffer + maxtoken)
-           p = grow_token_buffer (p);
-
-         *p++ = c;
-         c = getc (finput);
-       }
-      *p = 0;
-      return TYPENAME;
-
+      read_type_name (finput);
+      return tok_typename;

 
     case '%':
       return parse_percent_token ();
 
     default:
 
     case '%':
       return parse_percent_token ();
 
     default:

-      return ILLEGAL;
+      return tok_illegal;

     }
 }
 
     }
 }
 


@@ -520,49 +517,49 @@ struct percent_table_struct
   const char *name;
   void *set_flag;
   int retval;
   const char *name;
   void *set_flag;
   int retval;

-}
-percent_table[] =
+};
+
+struct percent_table_struct percent_table[] =

 {
 {

-  { "token", NULL, TOKEN },
-  { "term", NULL, TOKEN },
-  { "nterm", NULL, NTERM },
-  { "type", NULL, TYPE },
-  { "guard", NULL, GUARD },
-  { "union", NULL, UNION },
-  { "expect", NULL, EXPECT },
-  { "thong", NULL, THONG },
-  { "start", NULL, START },
-  { "left", NULL, LEFT },
-  { "right", NULL, RIGHT },
-  { "nonassoc", NULL, NONASSOC },
-  { "binary", NULL, NONASSOC },
-  { "semantic_parser", NULL, SEMANTIC_PARSER },
-  { "pure_parser", NULL, PURE_PARSER },
-  { "prec", NULL, PREC },
-  { "locations", &locations_flag, NOOP},       /* -l */
-  { "no_lines", &no_lines_flag, NOOP}, /* -l */
-  { "raw", &raw_flag, NOOP },  /* -r */
-  { "token_table", &token_table_flag, NOOP},   /* -k */
+  { "token",           NULL,                   tok_token },
+  { "term",            NULL,                   tok_token },
+  { "nterm",           NULL,                   tok_nterm },
+  { "type",            NULL,                   tok_type },
+  { "guard",           NULL,                   tok_guard },
+  { "union",           NULL,                   tok_union },
+  { "expect",          NULL,                   tok_expect },
+  { "thong",           NULL,                   tok_thong },
+  { "start",           NULL,                   tok_start },
+  { "left",            NULL,                   tok_left },
+  { "right",           NULL,                   tok_right },
+  { "nonassoc",                NULL,                   tok_nonassoc },
+  { "binary",          NULL,                   tok_nonassoc },
+  { "prec",            NULL,                   tok_prec },
+  { "locations",       &locations_flag,        tok_noop },     /* -l */
+  { "no_lines",                &no_lines_flag,         tok_noop },     /* -l */
+  { "raw",             NULL,                   tok_obsolete }, /* -r */
+  { "token_table",     &token_table_flag,      tok_noop },     /* -k */
+  { "yacc",            &yacc_flag,             tok_noop },     /* -y */
+  { "fixed_output_files",&yacc_flag,           tok_noop },     /* -y */
+  { "defines",         &defines_flag,          tok_noop },     /* -d */
+  { "no_parser",       &no_parser_flag,        tok_noop },     /* -n */

 #if 0
 #if 0

-    /* These can be utilized after main is reoganized so
-       open_files() is deferred 'til after read_declarations().
-       But %{ and %union both put information into files
-       that have to be opened before read_declarations().
-     */
-  { "yacc", &yacc_flag, NOOP},                         /* -y */
-  { "fixed_output_files", &yacc_flag, NOOP},           /* -y */
-  { "defines", &defines_flag, NOOP},                   /* -d */
-  { "no_parser", &no_parser_flag, NOOP},               /* -n */
-  { "output_file", &spec_outfile, SETOPT},             /* -o */
-  { "file_prefix", &spec_file_prefix, SETOPT},         /* -b */
-  { "name_prefix", &spec_name_prefix, SETOPT},         /* -p */
-    /* These would be acceptable, but they do not affect processing */
-  { "verbose", &verbose_flag, NOOP},                   /* -v */
-  { "debug", &debug_flag, NOOP},                       /* -t */
-/*    {"help", <print usage stmt>, NOOP}, *//* -h */
-/*    {"version", <print version number> ,  NOOP}, *//* -V */
+  /* For the time being, this is not enabled yet, while it's possible
+     though, since we use obstacks.  The only risk is with semantic
+     parsers which will output an `include' of an output file: be sure
+     that the naem included is indeed the name of the output file.  */
+  { "output_file",     &spec_outfile,          tok_setopt },   /* -o */
+  { "file_prefix",     &spec_file_prefix,      tok_setopt },   /* -b */
+  { "name_prefix",     &spec_name_prefix,      tok_setopt },   /* -p */

 #endif
 #endif

-  { NULL, NULL, ILLEGAL}
+  { "header_extension",        NULL,                   tok_hdrext},
+  { "source_extension",        NULL,                   tok_srcext},
+  { "verbose",         &verbose_flag,          tok_noop },     /* -v */
+  { "debug",           &debug_flag,            tok_noop },     /* -t */
+  { "semantic_parser", &semantic_parser,       tok_noop },
+  { "pure_parser",     &pure_parser,           tok_noop },
+
+  { NULL, NULL, tok_illegal}

 };
 
 /* Parse a token which starts with %.
 };
 
 /* Parse a token which starts with %.


@@ -572,71 +569,72 @@ int
 parse_percent_token (void)
 {
   int c;
 parse_percent_token (void)
 {
   int c;

-  char *p;

   struct percent_table_struct *tx;
 
   struct percent_table_struct *tx;
 

-  p = token_buffer;

   c = getc (finput);
   c = getc (finput);

-  *p++ = '%';
-  *p++ = c;                    /* for error msg */
-  *p = 0;

 
   switch (c)
     {
     case '%':
 
   switch (c)
     {
     case '%':

-      return TWO_PERCENTS;
+      return tok_two_percents;

 
     case '{':
 
     case '{':

-      return PERCENT_LEFT_CURLY;
+      return tok_percent_left_curly;

 
     case '<':
 
     case '<':

-      return LEFT;
+      return tok_left;

 
     case '>':
 
     case '>':

-      return RIGHT;
+      return tok_right;

 
     case '2':
 
     case '2':

-      return NONASSOC;
+      return tok_nonassoc;

 
     case '0':
 
     case '0':

-      return TOKEN;
+      return tok_token;

 
     case '=':
 
     case '=':

-      return PREC;
+      return tok_prec;

     }
     }

+

   if (!isalpha (c))
   if (!isalpha (c))

-    return ILLEGAL;
+    return tok_illegal;

 
 

-  p = token_buffer;
-  *p++ = '%';
+  obstack_1grow (&token_obstack, '%');

   while (isalpha (c) || c == '_' || c == '-')
     {
   while (isalpha (c) || c == '_' || c == '-')
     {

-      if (p == token_buffer + maxtoken)
-       p = grow_token_buffer (p);
-

       if (c == '-')
        c = '_';
       if (c == '-')
        c = '_';

-      *p++ = c;
+      obstack_1grow (&token_obstack, c);

       c = getc (finput);
     }
 
   ungetc (c, finput);
       c = getc (finput);
     }
 
   ungetc (c, finput);

-
-  *p = 0;
+  obstack_1grow (&token_obstack, '\0');
+  token_buffer = obstack_finish (&token_obstack);

 
   /* table lookup % directive */
   for (tx = percent_table; tx->name; tx++)
     if (strcmp (token_buffer + 1, tx->name) == 0)
       break;
 
   /* table lookup % directive */
   for (tx = percent_table; tx->name; tx++)
     if (strcmp (token_buffer + 1, tx->name) == 0)
       break;

-  if (tx->retval == SETOPT)
-    {
-      *((char **) (tx->set_flag)) = optarg;
-      return NOOP;
-    }
+

   if (tx->set_flag)
     {
       *((int *) (tx->set_flag)) = 1;
   if (tx->set_flag)
     {
       *((int *) (tx->set_flag)) = 1;

-      return NOOP;
+      return tok_noop;

     }
     }

+
+  switch (tx->retval)
+    {
+    case tok_setopt:
+      *((char **) (tx->set_flag)) = optarg;
+      return tok_noop;
+      break;
+
+    case tok_obsolete:
+      fatal (_("`%s' is no longer supported"), token_buffer);
+      break;
+    }
+

   return tx->retval;
 }
   return tx->retval;
 }