lex.yy.c

一个编译器修改的例子

static yy_state_type yy_last_accepting_state;
static char *yy_last_accepting_cpos;

extern int yy_flex_debug;
int yy_flex_debug = 0;

/* The intent behind this definition is that it'll catch
 * any uses of REJECT which flex missed.
 */
#define REJECT reject_used_but_not_detected
#define yymore() yymore_used_but_not_detected
#define YY_MORE_ADJ 0
#define YY_RESTORE_YY_MORE_OFFSET
char *yytext;
#line 1 "lex.l"
#line 2 "lex.l"
#include "grammar.tab.h"
#include "error.h"
#include "io.h"
#include "lex.h"
#include "salloc.h"
#include "token.h"

#define MAX_INCLUDE_DEPTH 32

unsigned		current_line	= 1;
static unsigned		comment_level	= 0, comment_start;
static unsigned		include_level	= 0;

static struct
{
    unsigned		current_line;
    const char		*current_file;
    YY_BUFFER_STATE	buffer_state;
}
include_stack [MAX_INCLUDE_DEPTH];

static void	new_input();

#if defined __GNUC__ /* prevent some compiler warnings */
#if !(defined __OpenBSD__ || defined __FreeBSD__) /* fix compile error on OpenBSD */
extern int	fileno(FILE *);
#endif
static void	yyunput(int c, register char *yy_bp) __attribute__((unused));
#endif
/* Matches both ternminated and unterminated character/string constants */


#line 617 "lex.yy.c"

#define INITIAL 0
#define COMMENT 1
#define INCLUDE 2

#ifndef YY_NO_UNISTD_H
/* Special case for "unistd.h", since it is non-ANSI. We include it way
 * down here because we want the user's section 1 to have been scanned first.
 * The user has a chance to override it with an option.
 */
#include <unistd.h>
#endif

#ifndef YY_EXTRA_TYPE
#define YY_EXTRA_TYPE void *
#endif

static int yy_init_globals (void );

/* Accessor methods to globals.
   These are made visible to non-reentrant scanners for convenience. */

int yylex_destroy (void );

int yyget_debug (void );

void yyset_debug (int debug_flag  );

YY_EXTRA_TYPE yyget_extra (void );

void yyset_extra (YY_EXTRA_TYPE user_defined  );

FILE *yyget_in (void );

void yyset_in  (FILE * in_str  );

FILE *yyget_out (void );

void yyset_out  (FILE * out_str  );

int yyget_leng (void );

char *yyget_text (void );

int yyget_lineno (void );

void yyset_lineno (int line_number  );

/* Macros after this point can all be overridden by user definitions in
 * section 1.
 */

#ifndef YY_SKIP_YYWRAP
#ifdef __cplusplus
extern "C" int yywrap (void );
#else
extern int yywrap (void );
#endif
#endif

    static void yyunput (int c,char *buf_ptr  );
    
#ifndef yytext_ptr
static void yy_flex_strncpy (char *,yyconst char *,int );
#endif

#ifdef YY_NEED_STRLEN
static int yy_flex_strlen (yyconst char * );
#endif

#ifndef YY_NO_INPUT

#ifdef __cplusplus
static int yyinput (void );
#else
static int input (void );
#endif

#endif

/* Amount of stuff to slurp up with each read. */
#ifndef YY_READ_BUF_SIZE
#define YY_READ_BUF_SIZE 8192
#endif

/* Copy whatever the last rule matched to the standard output. */
#ifndef ECHO
/* This used to be an fputs(), but since the string might contain NUL's,
 * we now use fwrite().
 */
#define ECHO fwrite( yytext, yyleng, 1, yyout )
#endif

/* Gets input and stuffs it into "buf".  number of characters read, or YY_NULL,
 * is returned in "result".
 */
#ifndef YY_INPUT
#define YY_INPUT(buf,result,max_size) \
	if ( YY_CURRENT_BUFFER_LVALUE->yy_is_interactive ) \
		{ \
		int c = '*'; \
		int n; \
		for ( n = 0; n < max_size && \
			     (c = getc( yyin )) != EOF && c != '\n'; ++n ) \
			buf[n] = (char) c; \
		if ( c == '\n' ) \
			buf[n++] = (char) c; \
		if ( c == EOF && ferror( yyin ) ) \
			YY_FATAL_ERROR( "input in flex scanner failed" ); \
		result = n; \
		} \
	else \
		{ \
		errno=0; \
		while ( (result = fread(buf, 1, max_size, yyin))==0 && ferror(yyin)) \
			{ \
			if( errno != EINTR) \
				{ \
				YY_FATAL_ERROR( "input in flex scanner failed" ); \
				break; \
				} \
			errno=0; \
			clearerr(yyin); \
			} \
		}\
\

#endif

/* No semi-colon after return; correct usage is to write "yyterminate();" -
 * we don't want an extra ';' after the "return" because that will cause
 * some compilers to complain about unreachable statements.
 */
#ifndef yyterminate
#define yyterminate() return YY_NULL
#endif

/* Number of entries by which start-condition stack grows. */
#ifndef YY_START_STACK_INCR
#define YY_START_STACK_INCR 25
#endif

/* Report a fatal error. */
#ifndef YY_FATAL_ERROR
#define YY_FATAL_ERROR(msg) yy_fatal_error( msg )
#endif

/* end tables serialization structures and prototypes */

/* Default declaration of generated scanner - a define so the user can
 * easily add parameters.
 */
#ifndef YY_DECL
#define YY_DECL_IS_OURS 1

extern int yylex (void);

#define YY_DECL int yylex (void)
#endif /* !YY_DECL */

/* Code executed at the beginning of each rule, after yytext and yyleng
 * have been set up.
 */
#ifndef YY_USER_ACTION
#define YY_USER_ACTION
#endif

/* Code executed at the end of each rule. */
#ifndef YY_BREAK
#define YY_BREAK break;
#endif

#define YY_RULE_SETUP \
	if ( yyleng > 0 ) \
		YY_CURRENT_BUFFER_LVALUE->yy_at_bol = \
				(yytext[yyleng - 1] == '\n'); \
	YY_USER_ACTION

/** The main scanner function which does all the work.
 */
YY_DECL
{
	register yy_state_type yy_current_state;
	register char *yy_cp, *yy_bp;
	register int yy_act;
    
#line 54 "lex.l"


#line 807 "lex.yy.c"

	if ( !(yy_init) )
		{
		(yy_init) = 1;

#ifdef YY_USER_INIT
		YY_USER_INIT;
#endif

		if ( ! (yy_start) )
			(yy_start) = 1;	/* first start state */

		if ( ! yyin )
			yyin = stdin;

		if ( ! yyout )
			yyout = stdout;

		if ( ! YY_CURRENT_BUFFER ) {
			yyensure_buffer_stack ();
			YY_CURRENT_BUFFER_LVALUE =
				yy_create_buffer(yyin,YY_BUF_SIZE );
		}

		yy_load_buffer_state( );
		}

	while ( 1 )		/* loops until end-of-file is reached */
		{
		yy_cp = (yy_c_buf_p);

		/* Support of yytext. */
		*yy_cp = (yy_hold_char);

		/* yy_bp points to the position in yy_ch_buf of the start of
		 * the current run.
		 */
		yy_bp = yy_cp;

		yy_current_state = (yy_start);
		yy_current_state += YY_AT_BOL();
yy_match:
		do
			{
			register YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*yy_cp)];
			if ( yy_accept[yy_current_state] )
				{
				(yy_last_accepting_state) = yy_current_state;
				(yy_last_accepting_cpos) = yy_cp;
				}
			while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
				{
				yy_current_state = (int) yy_def[yy_current_state];
				if ( yy_current_state >= 185 )
					yy_c = yy_meta[(unsigned int) yy_c];
				}
			yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
			++yy_cp;
			}
		while ( yy_base[yy_current_state] != 278 );

yy_find_action:
		yy_act = yy_accept[yy_current_state];
		if ( yy_act == 0 )
			{ /* have to back up */
			yy_cp = (yy_last_accepting_cpos);
			yy_current_state = (yy_last_accepting_state);
			yy_act = yy_accept[yy_current_state];
			}

		YY_DO_BEFORE_ACTION;

do_action:	/* This label is used only to access EOF actions. */

		switch ( yy_act )
	{ /* beginning of action switch */
			case 0: /* must back up */
			/* undo the effects of YY_DO_BEFORE_ACTION */
			*yy_cp = (yy_hold_char);
			yy_cp = (yy_last_accepting_cpos);
			yy_current_state = (yy_last_accepting_state);
			goto yy_find_action;

case 1:
YY_RULE_SETUP
#line 56 "lex.l"

	YY_BREAK
case 2:
/* rule 2 can match eol */
YY_RULE_SETUP
#line 57 "lex.l"
++ current_line;
	YY_BREAK
case 3:
YY_RULE_SETUP
#line 59 "lex.l"
comment_level = 1; comment_start = current_line; BEGIN(COMMENT);
	YY_BREAK


case 4:
YY_RULE_SETUP
#line 63 "lex.l"
++ comment_level;
	YY_BREAK
case 5:
YY_RULE_SETUP
#line 64 "lex.l"
if (-- comment_level == 0) BEGIN(INITIAL);
	YY_BREAK
case 6:
/* rule 6 can match eol */
YY_RULE_SETUP
#line 65 "lex.l"
++ current_line;
	YY_BREAK
case 7:
YY_RULE_SETUP
#line 66 "lex.l"

	YY_BREAK

case 8:
YY_RULE_SETUP
#line 69 "lex.l"
BEGIN(INCLUDE);
	YY_BREAK


case 9:
YY_RULE_SETUP
#line 73 "lex.l"

	YY_BREAK
case 10:
YY_RULE_SETUP
#line 74 "lex.l"
new_input();
	YY_BREAK

case 11:
YY_RULE_SETUP
#line 77 "lex.l"
return ASSIGNMENT;
	YY_BREAK
case 12:
YY_RULE_SETUP
#line 78 "lex.l"
yylval.token = new_token(); return GREATER_EQUAL;
	YY_BREAK
case 13:
YY_RULE_SETUP
#line 79 "lex.l"
yylval.token = new_token(); return NOT_EQUAL;
	YY_BREAK
case 14:
YY_RULE_SETUP
#line 80 "lex.l"
yylval.token = new_token(); return SMALLER_EQUAL;
	YY_BREAK
case 15:
YY_RULE_SETUP
#line 82 "lex.l"
yylval.token = new_token(); return AND;
	YY_BREAK
case 16:
YY_RULE_SETUP
#line 83 "lex.l"
return ARRAY;
	YY_BREAK
case 17:
YY_RULE_SETUP
#line 84 "lex.l"
return _BEGIN;
	YY_BREAK
case 18:
YY_RULE_SETUP
#line 85 "lex.l"
return BOOL;
	YY_BREAK
case 19:
YY_RULE_SETUP
#line 86 "lex.l"
return BY;
	YY_BREAK
case 20:
YY_RULE_SETUP
#line 87 "lex.l"
return CHAR;
	YY_BREAK
case 21:
YY_RULE_SETUP
#line 88 "lex.l"
return DELETE;
	YY_BREAK
case 22:
YY_RULE_SETUP
#line 89 "lex.l"
return DO;
	YY_BREAK
case 23:
YY_RULE_SETUP
#line 90 "lex.l"
return ELSE;
	YY_BREAK
case 24:
YY_RULE_SETUP
#line 91 "lex.l"
return END;
	YY_BREAK
case 25:
YY_RULE_SETUP
#line 92 "lex.l"
yylval.token = new_token(); return FALSE;
	YY_BREAK
case 26:
YY_RULE_SETUP
#line 93 "lex.l"
return FOR;
	YY_BREAK
case 27:
YY_RULE_SETUP
#line 94 "lex.l"
return FUNCTION;
	YY_BREAK
case 28:
YY_RULE_SETUP
#line 95 "lex.l"
return IF;
	YY_BREAK
case 29:
YY_RULE_SETUP
#line 96 "lex.l"
return INT;
	YY_BREAK
case 30:
YY_RULE_SETUP
#line 97 "lex.l"
return IS;
	YY_BREAK
case 31:
YY_RULE_SETUP
#line 98 "lex.l"
yylval.token = new_token(); return NEW;
	YY_BREAK
case 32:
YY_RULE_SETUP
#line 99 "lex.l"
yylval.token = new_token(); return NOT;
	YY_BREAK
case 33:
YY_RULE_SETUP
#line 100 "lex.l"
yylval.token = new_token(); return __NULL;
	YY_BREAK
case 34:
YY_RULE_SETUP
#line 101 "lex.l"
return OF;
	YY_BREAK
case 35:
YY_RULE_SETUP
#line 102 "lex.l"
yylval.token = new_token(); return OR;
	YY_BREAK
case 36:
YY_RULE_SETUP
#line 103 "lex.l"
return PROCEDURE;
	YY_BREAK
case 37:
YY_RULE_SETUP
#line 104 "lex.l"
return REAL;
	YY_BREAK
case 38:
YY_RULE_SETUP
#line 105 "lex.l"
return REPEAT;
	YY_BREAK
case 39:
YY_RULE_SETUP
#line 106 "lex.l"
yylval.token = new_token(); return RETURN;
	YY_BREAK
case 40:
YY_RULE_SETUP
#line 107 "lex.l"
yylval.token = new_token(); return SIZE;
	YY_BREAK
case 41:
YY_RULE_SETUP
#line 108 "lex.l"
return STRING;
	YY_BREAK
case 42:
YY_RULE_SETUP
#line 109 "lex.l"
return THEN;
	YY_BREAK
case 43:
YY_RULE_SETUP
#line 110 "lex.l"
return TO;
	YY_BREAK
case 44:
YY_RULE_SETUP
#line 111 "lex.l"
yylval.token = new_token(); return TRUE;
	YY_BREAK
case 45:
YY_RULE_SETUP
#line 112 "lex.l"
return UNTIL;
	YY_BREAK
case 46:
YY_RULE_SETUP
#line 113 "lex.l"
return VAR;
	YY_BREAK
case 47:
YY_RULE_SETUP
#line 114 "lex.l"
return WHILE;
	YY_BREAK