/* 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.
#include "system.h"
#include "getargs.h"
#include "files.h"
-#include "getopt.h" /* for optarg */
#include "symtab.h"
+#include "options.h"
#include "lex.h"
-#include "xalloc.h"
#include "complain.h"
#include "gram.h"
#include "quote.h"
/* Buffer for storing the current token. */
-char *token_buffer;
+static struct obstack token_obstack;
+const char *token_buffer = NULL;
-/* Allocated size of token_buffer, not including space for terminator. */
-int maxtoken;
-
-bucket *symval;
+bucket *symval = NULL;
int numval;
-static int unlexed; /* these two describe a token to be reread */
-static bucket *unlexed_symval; /* by the next call to lex */
-
+/* A token to be reread, see unlex and lex. */
+static token_t unlexed = tok_undef;
+static bucket *unlexed_symval = NULL;
+static const char *unlexed_token_buffer = NULL;
void
-init_lex (void)
+lex_init (void)
{
- maxtoken = 100;
- token_buffer = XCALLOC (char, maxtoken + 1);
- unlexed = -1;
+ obstack_init (&token_obstack);
+ unlexed = tok_undef;
}
-char *
-grow_token_buffer (char *p)
+void
+lex_free (void)
{
- int offset = p - token_buffer;
- maxtoken *= 2;
- token_buffer = XREALLOC (token_buffer, char, maxtoken + 1);
- return token_buffer + offset;
+ obstack_free (&token_obstack, NULL);
}
| Do a getc, but give error message if EOF encountered |
`-----------------------------------------------------*/
-static int
+int
xgetc (FILE *f)
{
int c = getc (f);
}
-/*------------------------------------------------------------------.
-| Read one literal character from finput. Process \ escapes. |
-| Append the normalized string version of the char to *PP. Assign |
-| the character code to *PCODE. Return 1 unless the character is an |
-| unescaped `term' or \n report error for \n |
-`------------------------------------------------------------------*/
+/*---------------------------------------------------------------.
+| Read one literal character from FINPUT, process \-escapes, and |
+| return the character. |
+`---------------------------------------------------------------*/
-static int
-literalchar (char **pp, int *pcode, char term)
+char
+literalchar (void)
{
int c;
- char *p;
- int code;
- int wasquote = 0;
+ int res;
c = xgetc (finput);
if (c == '\n')
{
complain (_("unescaped newline in constant"));
ungetc (c, finput);
- code = '?';
- wasquote = 1;
+ res = '?';
}
else if (c != '\\')
{
- code = c;
- if (c == term)
- wasquote = 1;
+ res = c;
}
else
{
c = xgetc (finput);
if (c == 't')
- code = '\t';
+ res = '\t';
else if (c == 'n')
- code = '\n';
+ res = '\n';
else if (c == 'a')
- code = '\007';
+ res = '\007';
else if (c == 'r')
- code = '\r';
+ res = '\r';
else if (c == 'f')
- code = '\f';
+ res = '\f';
else if (c == 'b')
- code = '\b';
+ res = '\b';
else if (c == 'v')
- code = '\013';
+ res = '\013';
else if (c == '\\')
- code = '\\';
+ res = '\\';
else if (c == '\'')
- code = '\'';
+ res = '\'';
else if (c == '\"')
- code = '\"';
+ res = '\"';
else if (c <= '7' && c >= '0')
{
- code = 0;
+ res = 0;
while (c <= '7' && c >= '0')
{
- code = (code * 8) + (c - '0');
- if (code >= 256 || code < 0)
+ res = (res * 8) + (c - '0');
+ if (res >= 256 || res < 0)
{
complain (_("octal value outside range 0...255: `\\%o'"),
- code);
- code &= 0xFF;
+ res);
+ res &= 0xFF;
break;
}
c = xgetc (finput);
else if (c == 'x')
{
c = xgetc (finput);
- code = 0;
+ res = 0;
while (1)
{
if (c >= '0' && c <= '9')
- code *= 16, code += c - '0';
+ res *= 16, res += c - '0';
else if (c >= 'a' && c <= 'f')
- code *= 16, code += c - 'a' + 10;
+ res *= 16, res += c - 'a' + 10;
else if (c >= 'A' && c <= 'F')
- code *= 16, code += c - 'A' + 10;
+ res *= 16, res += c - 'A' + 10;
else
break;
- if (code >= 256 || code < 0)
+ if (res >= 256 || res < 0)
{
- complain (_("hexadecimal value above 255: `\\x%x'"), code);
- code &= 0xFF;
+ complain (_("hexadecimal value above 255: `\\x%x'"), res);
+ res &= 0xFF;
break;
}
c = xgetc (finput);
}
else
{
- char buf [] = "c";
- buf[0] = c;
+ char badchar [] = "c";
+ badchar[0] = c;
complain (_("unknown escape sequence: `\\' followed by `%s'"),
- quote (buf));
- code = '?';
+ quote (badchar));
+ res = '?';
}
} /* 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. */
-
- p = *pp;
- if (code == term && wasquote)
- *p++ = code;
- else if (code == '\\')
- {
- *p++ = '\\';
- *p++ = '\\';
- }
- else if (code == '\'')
- {
- *p++ = '\\';
- *p++ = '\'';
- }
- else if (code == '\"')
- {
- *p++ = '\\';
- *p++ = '\"';
- }
- else if (code >= 040 && code < 0177)
- *p++ = code;
- else if (code == '\t')
- {
- *p++ = '\\';
- *p++ = 't';
- }
- else if (code == '\n')
- {
- *p++ = '\\';
- *p++ = 'n';
- }
- else if (code == '\r')
- {
- *p++ = '\\';
- *p++ = 'r';
- }
- else if (code == '\v')
- {
- *p++ = '\\';
- *p++ = 'v';
- }
- else if (code == '\b')
- {
- *p++ = '\\';
- *p++ = 'b';
- }
- else if (code == '\f')
- {
- *p++ = '\\';
- *p++ = 'f';
- }
- else
- {
- *p++ = '\\';
- *p++ = code / 0100 + '0';
- *p++ = ((code / 010) & 07) + '0';
- *p++ = (code & 07) + '0';
- }
- *pp = p;
- *pcode = code;
- return !wasquote;
+ return res;
}
void
-unlex (int token)
+unlex (token_t token)
{
unlexed = token;
+ unlexed_token_buffer = token_buffer;
unlexed_symval = symval;
}
void
read_type_name (FILE *fin)
{
- char *p = token_buffer;
int c = getc (fin);
while (c != '>')
break;
}
- if (p == token_buffer + maxtoken)
- p = grow_token_buffer (p);
-
- *p++ = c;
+ obstack_1grow (&token_obstack, c);
c = getc (fin);
}
- *p = 0;
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
}
-int
+token_t
lex (void)
{
int c;
- char *p;
- if (unlexed >= 0)
+ /* Just to make sure. */
+ token_buffer = NULL;
+
+ if (unlexed != tok_undef)
{
+ token_t res = unlexed;
symval = unlexed_symval;
- c = unlexed;
- unlexed = -1;
- return c;
+ token_buffer = unlexed_token_buffer;
+ unlexed = tok_undef;
+ return res;
}
c = skip_white_space ();
- /* for error messages (token buffer always valid) */
- *token_buffer = c;
- token_buffer[1] = 0;
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 'z':
case '.': case '_':
- p = token_buffer;
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);
}
-
- *p = 0;
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
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;
- p = token_buffer;
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);
}
- *p = 0;
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
ungetc (c, finput);
- return NUMBER;
+ return tok_number;
}
case '\'':
/* parse the literal token and compute character code in code */
- translations = -1;
{
- int code, discode;
- char discard[10], *dp;
+ int code = literalchar ();
- p = token_buffer;
- *p++ = '\'';
- literalchar (&p, &code, '\'');
+ obstack_1grow (&token_obstack, '\'');
+ obstack_1grow (&token_obstack, code);
c = getc (finput);
if (c != '\'')
{
complain (_("use \"...\" for multi-character literal tokens"));
- while (1)
- {
- dp = discard;
- if (!literalchar (&dp, &discode, '\''))
- break;
- }
+ while (literalchar () != '\'')
+ /* Skip. */;
}
- *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)
+ if (symval->user_token_number == SUNDEF)
symval->user_token_number = code;
- return IDENTIFIER;
+ return tok_identifier;
}
case '\"':
/* parse the literal string token and treat as an identifier */
- translations = -1;
{
int code; /* ignored here */
- p = token_buffer;
- *p++ = '\"';
+
+ obstack_1grow (&token_obstack, '\"');
/* Read up to and including ". */
- while (literalchar (&p, &code, '\"'))
+ do
{
- if (p >= token_buffer + maxtoken - 4)
- p = grow_token_buffer (p);
+ code = literalchar ();
+ obstack_1grow (&token_obstack, code);
}
- *p = 0;
+ while (code != '\"');
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
symval = getsym (token_buffer);
symval->class = token_sym;
- return IDENTIFIER;
+ return tok_identifier;
}
case ',':
- return COMMA;
+ token_buffer = ",";
+ return tok_comma;
case ':':
- return COLON;
+ token_buffer = ":";
+ return tok_colon;
case ';':
- return SEMICOLON;
+ token_buffer = ";";
+ return tok_semicolon;
case '|':
- return BAR;
+ token_buffer = "|";
+ return tok_bar;
case '{':
- return LEFT_CURLY;
+ token_buffer = "{";
+ return tok_left_curly;
case '=':
+ obstack_1grow (&token_obstack, c);
do
{
c = getc (finput);
+ obstack_1grow (&token_obstack, c);
if (c == '\n')
lineno++;
}
while (c == ' ' || c == '\n' || c == '\t');
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
if (c == '{')
{
- strcpy (token_buffer, "={");
- return LEFT_CURLY;
+ return tok_left_curly;
}
else
{
ungetc (c, finput);
- return ILLEGAL;
+ return tok_illegal;
}
case '<':
read_type_name (finput);
- return TYPENAME;
+ return tok_typename;
case '%':
return parse_percent_token ();
default:
- return ILLEGAL;
+ obstack_1grow (&token_obstack, c);
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
+ return tok_illegal;
}
}
-/* the following table dictates the action taken for the various %
- directives. A set_flag value causes the named flag to be set. A
- retval action returns the code. */
-struct percent_table_struct
+/* This function is a strcmp, which doesn't differentiate `-' and `_'
+ chars. */
+
+static int
+option_strcmp (const char *left, const char *right)
{
- const char *name;
- void *set_flag;
- int retval;
+ const unsigned char *l, *r;
+ int c;
+
+ assert (left);
+ assert (right);
+ l = (const unsigned char *)left;
+ r = (const unsigned char *)right;
+ while (((c = *l - *r++) == 0 && *l != '\0')
+ || ((*l == '-' || *l == '_') && (*r == '_' || *r == '-')))
+ l++;
+ return c;
}
-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 */
-#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 */
-#endif
- { NULL, NULL, ILLEGAL}
-};
/* Parse a token which starts with %.
Assumes the % has already been read and discarded. */
-int
+token_t
parse_percent_token (void)
{
- int c;
- char *p;
- struct percent_table_struct *tx;
+ const struct option_table_struct *tx = NULL;
+ const char *arg = NULL;
+ /* Where the ARG was found in token_buffer. */
+ size_t arg_offset = 0;
- p = token_buffer;
- c = getc (finput);
- *p++ = '%';
- *p++ = c; /* for error msg */
- *p = 0;
+ int c = getc (finput);
+ obstack_1grow (&token_obstack, '%');
+ obstack_1grow (&token_obstack, c);
switch (c)
{
case '%':
- return TWO_PERCENTS;
+ token_buffer = obstack_finish (&token_obstack);
+ return tok_two_percents;
case '{':
- return PERCENT_LEFT_CURLY;
+ token_buffer = obstack_finish (&token_obstack);
+ return tok_percent_left_curly;
+ /* The following guys are here for backward compatibility with
+ very ancient Yacc versions. The paper of Johnson mentions
+ them (as ancient :). */
case '<':
- return LEFT;
+ token_buffer = obstack_finish (&token_obstack);
+ return tok_left;
case '>':
- return RIGHT;
+ token_buffer = obstack_finish (&token_obstack);
+ return tok_right;
case '2':
- return NONASSOC;
+ token_buffer = obstack_finish (&token_obstack);
+ return tok_nonassoc;
case '0':
- return TOKEN;
+ token_buffer = obstack_finish (&token_obstack);
+ return tok_token;
case '=':
- return PREC;
+ token_buffer = obstack_finish (&token_obstack);
+ return tok_prec;
}
+
if (!isalpha (c))
- return ILLEGAL;
+ {
+ token_buffer = obstack_finish (&token_obstack);
+ return tok_illegal;
+ }
- p = token_buffer;
- *p++ = '%';
- while (isalpha (c) || c == '_' || c == '-')
+ while (c = getc (finput), isalpha (c) || c == '_' || c == '-')
{
- if (p == token_buffer + maxtoken)
- p = grow_token_buffer (p);
+ if (c == '_')
+ c = '-';
+ obstack_1grow (&token_obstack, c);
+ }
- if (c == '-')
- c = '_';
- *p++ = c;
+ /* %DIRECTIVE="ARG". Separate into
+ TOKEN_BUFFER = `%DIRECTIVE\0ARG\0'.
+ This is a bit hackish, but once we move to a Bison parser,
+ things will be cleaned up. */
+ if (c == '=')
+ {
+ /* End of the directive. We skip the `='. */
+ obstack_1grow (&token_obstack, '\0');
+ /* Fetch the ARG if present. */
c = getc (finput);
+ if (c == '"')
+ {
+ int code;
+ arg_offset = obstack_object_size (&token_obstack);
+ /* Read up to and including `"'. Do not append the closing
+ `"' in the output: it's not part of the ARG. */
+ while ((code = literalchar ()) != '"')
+ obstack_1grow (&token_obstack, code);
+ }
+ /* else: should be an error. */
}
+ else
+ ungetc (c, finput);
- ungetc (c, finput);
-
- *p = 0;
+ obstack_1grow (&token_obstack, '\0');
+ token_buffer = obstack_finish (&token_obstack);
+ if (arg_offset)
+ arg = token_buffer + arg_offset;
/* table lookup % directive */
- for (tx = percent_table; tx->name; tx++)
- if (strcmp (token_buffer + 1, tx->name) == 0)
+ for (tx = option_table; tx->name; tx++)
+ if ((tx->access == opt_percent || tx->access == opt_both)
+ && option_strcmp (token_buffer + 1, tx->name) == 0)
break;
- if (tx->retval == SETOPT)
- {
- *((char **) (tx->set_flag)) = optarg;
- return NOOP;
- }
- if (tx->set_flag)
+
+ if (arg && tx->ret_val != tok_stropt)
+ fatal (_("`%s' supports no argument: %s"), token_buffer, quote (arg));
+
+
+ switch (tx->ret_val)
{
+ case tok_stropt:
+ assert (tx->set_flag);
+ if (arg)
+ {
+ /* Keep only the first assignment: command line options have
+ already been processed, and we want them to have
+ precedence. Side effect: if this %-option is used
+ several times, only the first is honored. Bah. */
+ if (!*((char **) (tx->set_flag)))
+ *((char **) (tx->set_flag)) = xstrdup (arg);
+ }
+ else
+ fatal (_("`%s' requires an argument"), token_buffer);
+ return tok_noop;
+ break;
+
+ case tok_intopt:
+ assert (tx->set_flag);
*((int *) (tx->set_flag)) = 1;
- return NOOP;
+ return tok_noop;
+ break;
+
+ case tok_obsolete:
+ fatal (_("`%s' is no longer supported"), token_buffer);
+ return tok_noop;
+ break;
+
+ default:
+ return tx->ret_val;
+ break;
}
- return tx->retval;
+ abort ();
}
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