mix_eval_scanner.c

汇编语言编程源代码

#define YY_DECL							\
  mix_eval_result_t  mix_eval_expr (mix_eval_data_ *data)

  /* keep track of current position in buffer */
#define YY_USER_ACTION yypos += yyleng;

#define RETURN_STATE(err)			\
  do {						\
    done = TRUE;                                \
    state = err;				\
    BEGIN (INITIAL);				\
  } while (FALSE)

#define CLEAN_UP()				\
  do {						\
    yy_delete_buffer (buffer);			\
    g_free (expr_cp);				\
 } while (FALSE)

static mix_word_t
  eval_binop_ (const gchar *op, mix_word_t x, mix_word_t y);
 
static int
  unput_word_ (mix_word_t word);
 
#define YY_MAIN 0
#define YY_STACK_USED 1
#define YY_NO_TOP_STATE 1
#define EVAL 1

#define WEVAL 2

#line 512 "lex.yy.c"

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

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

#ifndef YY_NO_UNPUT
static void yyunput YY_PROTO(( int c, char *buf_ptr ));
#endif

#ifndef yytext_ptr
static void yy_flex_strncpy YY_PROTO(( char *, yyconst char *, int ));
#endif

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

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

#if YY_STACK_USED
static int yy_start_stack_ptr = 0;
static int yy_start_stack_depth = 0;
static int *yy_start_stack = 0;
#ifndef YY_NO_PUSH_STATE
static void yy_push_state YY_PROTO(( int new_state ));
#endif
#ifndef YY_NO_POP_STATE
static void yy_pop_state YY_PROTO(( void ));
#endif
#ifndef YY_NO_TOP_STATE
static int yy_top_state YY_PROTO(( void ));
#endif

#else
#define YY_NO_PUSH_STATE 1
#define YY_NO_POP_STATE 1
#define YY_NO_TOP_STATE 1
#endif

#ifdef YY_MALLOC_DECL
YY_MALLOC_DECL
#else
#if __STDC__
#ifndef __cplusplus
#include <stdlib.h>
#endif
#else
/* Just try to get by without declaring the routines.  This will fail
 * miserably on non-ANSI systems for which sizeof(size_t) != sizeof(int)
 * or sizeof(void*) != sizeof(int).
 */
#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 (void) 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->yy_is_interactive ) \
		{ \
		int c = '*', 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 if ( ((result = fread( buf, 1, max_size, yyin )) == 0) \
		  && ferror( yyin ) ) \
		YY_FATAL_ERROR( "input in flex scanner failed" );
#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

/* Default declaration of generated scanner - a define so the user can
 * easily add parameters.
 */
#ifndef YY_DECL
#define YY_DECL int yylex YY_PROTO(( void ))
#endif

/* 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 \
	YY_USER_ACTION

YY_DECL
	{
	register yy_state_type yy_current_state;
	register char *yy_cp, *yy_bp;
	register int yy_act;

#line 85 "mix_eval_scanner.l"



  YY_BUFFER_STATE buffer;
  mix_word_t expr_val = MIX_WORD_ZERO, wexpr_val = MIX_WORD_ZERO;
  mix_word_t wexpr_val_tmp = MIX_WORD_ZERO;
  mix_eval_result_t state = MIX_EVAL_OK;
  gchar *expr_cp;
  gint yypos = -22; /* to account for padding */
  gboolean is_fp = FALSE, done = FALSE;
  g_assert (data != NULL && data->expr != NULL);
  /* make room enough to unput computed values */
  expr_cp = g_strdup_printf ("%-20s%s"," ", data->expr);
  buffer = yy_scan_string (expr_cp);
  data->errpos = -1;

  

#line 682 "lex.yy.c"

	if ( yy_init )
		{
		yy_init = 0;

#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 )
			yy_current_buffer =
				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_state_ptr = yy_state_buf;
		*yy_state_ptr++ = yy_current_state;
yy_match:
		do
			{
			register YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*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 >= 72 )
					yy_c = yy_meta[(unsigned int) yy_c];
				}
			yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
			*yy_state_ptr++ = yy_current_state;
			++yy_cp;
			}
		while ( yy_base[yy_current_state] != 159 );

yy_find_action:
		yy_current_state = *--yy_state_ptr;
		yy_lp = yy_accept[yy_current_state];
find_rule: /* we branch to this label when backing up */
		for ( ; ; ) /* until we find what rule we matched */
			{
			if ( yy_lp && yy_lp < yy_accept[yy_current_state + 1] )
				{
				yy_act = yy_acclist[yy_lp];
				if ( yy_act & YY_TRAILING_HEAD_MASK ||
				     yy_looking_for_trail_begin )
					{
					if ( yy_act == yy_looking_for_trail_begin )
						{
						yy_looking_for_trail_begin = 0;
						yy_act &= ~YY_TRAILING_HEAD_MASK;
						break;
						}
					}
				else if ( yy_act & YY_TRAILING_MASK )
					{
					yy_looking_for_trail_begin = yy_act & ~YY_TRAILING_MASK;
					yy_looking_for_trail_begin |= YY_TRAILING_HEAD_MASK;
					}
				else
					{
					yy_full_match = yy_cp;
					yy_full_state = yy_state_ptr;
					yy_full_lp = yy_lp;
					break;
					}
				++yy_lp;
				goto find_rule;
				}
			--yy_cp;
			yy_current_state = *--yy_state_ptr;
			yy_lp = 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 YY_STATE_EOF(INITIAL):
case YY_STATE_EOF(EVAL):
case YY_STATE_EOF(WEVAL):
#line 103 "mix_eval_scanner.l"
{
  CLEAN_UP ();
  return MIX_EVAL_INTERN;
}
	YY_BREAK

case 1:
YY_RULE_SETUP
#line 109 "mix_eval_scanner.l"
/* eat whitespace */
	YY_BREAK
case 2:
YY_RULE_SETUP
#line 110 "mix_eval_scanner.l"
{
    if (!done && state == MIX_EVAL_OK) {
       yypos -= yyleng; yyless (0);
      yy_push_state (WEVAL);
    } else {
      CLEAN_UP ();
      if (state == MIX_EVAL_OK) return (MIX_EVAL_SYNTAX);
      data->errpos = yypos;
      return state;
    }
  }
	YY_BREAK
case 3:
YY_RULE_SETUP
#line 121 "mix_eval_scanner.l"
{
    CLEAN_UP();
    if (state == MIX_EVAL_OK)
	data->value = wexpr_val;
    else
	data->errpos = yypos;
    return state;
  }
	YY_BREAK


case 4:
YY_RULE_SETUP
#line 132 "mix_eval_scanner.l"
{
    is_fp = TRUE;
    wexpr_val_tmp = mix_word_new (atol (yytext));
  }
	YY_BREAK
case 5:
YY_RULE_SETUP
#line 136 "mix_eval_scanner.l"
{
    glong val  = atol (yytext);
    if ( !is_fp ) { 
      RETURN_STATE (MIX_EVAL_MIS_PAREN);
    }  else if ( val < 0 || val > MIX_BYTE_MAX 
         || !mix_fspec_is_valid (mix_byte_new (val)) ) {
      RETURN_STATE (MIX_EVAL_INV_FSPEC);
    } else {
      is_fp = FALSE;
      wexpr_val = mix_word_store_field (mix_byte_new (val),
					wexpr_val_tmp, 
					wexpr_val);
    }
  }
	YY_BREAK
case 6:
YY_RULE_SETUP
#line 150 "mix_eval_scanner.l"
{
    wexpr_val = mix_word_new (atol (yytext));
  }
	YY_BREAK
case 7:
YY_RULE_SETUP
#line 153 "mix_eval_scanner.l"
{
    if (yytext[0] != '*')
      {
	yypos -= yyleng;
	yyless (0);
      }
    else
      {
	yypos -= yyleng - 1;
	expr_val = mix_short_to_word_fast (data->loc);
	yyless (1);
      }
    yy_push_state (EVAL);
  }
	YY_BREAK
case 8:
*yy_cp = yy_hold_char; /* undo effects of setting up yytext */
yy_c_buf_p = yy_cp = yy_bp + 1;
YY_DO_BEFORE_ACTION; /* set up yytext again */
YY_RULE_SETUP
#line 167 "mix_eval_scanner.l"
/* eat comma if followed by expression */
	YY_BREAK
case 9:
YY_RULE_SETUP
#line 168 "mix_eval_scanner.l"
{ /* ok if not inside an f-part */
    if ( is_fp ) {
      RETURN_STATE (MIX_EVAL_MIS_PAREN);
    }
    unput (yytext[yyleng-1]); --yypos;
    done = TRUE;
    yy_pop_state ();
  }
	YY_BREAK
case 10:
YY_RULE_SETUP
#line 176 "mix_eval_scanner.l"
RETURN_STATE (MIX_EVAL_SYNTAX);
	YY_BREAK


case 11:
YY_RULE_SETUP
#line 180 "mix_eval_scanner.l"
{
    const gchar *s = ( yytext[1] == '/' ) ? yytext+2 : yytext+1;
    mix_word_t value = mix_word_new (atol (s));
    expr_val = eval_binop_ (yytext, expr_val, value);
  }
	YY_BREAK
case 12:
YY_RULE_SETUP
#line 185 "mix_eval_scanner.l"
{
    const gchar *s = ( yytext[1] == '/' ) ? yytext+2 : yytext+1;
    if ( !mix_symbol_table_is_defined (data->table, s) ) {
      RETURN_STATE (MIX_EVAL_UNDEF_SYM);
    }
    expr_val = eval_binop_ (yytext, expr_val, 
			    mix_symbol_table_value (data->table, s));
  }
	YY_BREAK
case 13:
YY_RULE_SETUP
#line 193 "mix_eval_scanner.l"
{
    expr_val = eval_binop_ (yytext, expr_val, 
			    mix_short_to_word_fast (data->loc));
  }
	YY_BREAK
case 14:
YY_RULE_SETUP
#line 197 "mix_eval_scanner.l"
yypos -= unput_word_ (mix_short_to_word_fast (data->loc));
	YY_BREAK
case 15:
YY_RULE_SETUP
#line 198 "mix_eval_scanner.l"
expr_val = mix_word_new (atol (yytext));
	YY_BREAK
case 16:
YY_RULE_SETUP
#line 199 "mix_eval_scanner.l"
{
    if ( !mix_symbol_table_is_defined (data->table, yytext) ) {
      RETURN_STATE (MIX_EVAL_UNDEF_SYM);
    }
    expr_val = mix_symbol_table_value (data->table, yytext);
  }