abrowser.c

这是一个Linux下的集成开发环境

 * Lex input file for the Source-Navigator PowerPC assembly parser.
 */
#line 36 "abrowser.l"

#include <ctype.h>
#include <stdio.h>
#include "snptools.h"
#include "lexinput.h"

#undef yywrap
#define YY_SKIP_YYWRAP

#undef YY_INPUT
#define YY_INPUT(buf,r,ms) (r = sn_encoded_input(buf, ms))

enum { unknown, text, data };

static char *p;				/* general purpose pointer */
static char group[] = "asm";

static struct {
  char name[512];
  long line;
  long column;
  int length;
  unsigned char flag;
} last_label = { "", 0, 0, 0, 0 };

static int current_context = unknown;

void
emit_func_defn()
{
  last_label.line = sn_pop_line();
  last_label.column = sn_pop_column();

  sn_insert_symbol(SN_FUNC_DEF, NULL, last_label.name, sn_current_file(), 
		   last_label.line, last_label.column, sn_line(), 0,
		   0, NULL, NULL, NULL, NULL,
		   last_label.line, last_label.column, last_label.line,
		   last_label.column + last_label.length - 1);
}

/*
 * Flush any function definitions that might be outstanding (ie. if its
 * label appears _last_ in a file.  When we reach EOF, check to see if its
 * defn needs to be flushed to the database.  Normally the occurence of
 * another label causes the defn to be stored.
 * 
 * Return 1 so flex will keep playing.
 */

int
yywrap()
{
  if (last_label.flag > 0) {
    emit_func_defn();
    last_label.flag = 0;
  }
  return(1);
}

/*
 * This function removes any trailing .[0-9]+ extensions that a compiler
 * might add to the symbol name to indicate that it is a static.  We are
 * more concerned with its real name than its storage class, so we'll drop
 * the numeric extension here.
 */

static
void drop_numeric_extn(char *text)
{
  if (strchr(text, '.') != NULL) {
    text += strlen(text) - 1;

    while (isdigit(*text) != 0) {
      *text = '\0';
      text--;
    }

    if (*text == '.') {
      *text = '\0';
      text--;
    }
  }
}

#define COMMENT 1


/* 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 \
	if ( yyleng > 0 ) \
		yy_current_buffer->yy_at_bol = \
				(yytext[yyleng - 1] == '\n'); \
	YY_USER_ACTION

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

#line 134 "abrowser.l"



	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_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 >= 118 )
					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] != 282 );

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 136 "abrowser.l"
/* eat string literals */ 
	YY_BREAK
case 2:
YY_RULE_SETUP
#line 138 "abrowser.l"
{
  for (p = yytext; !isspace(*p); sn_advance_column(1), p++);
  for (; isspace(*p); sn_advance_column(1), p++);
}
	YY_BREAK
case 3:
YY_RULE_SETUP
#line 143 "abrowser.l"
{
  current_context = text;
  sn_advance_column(yyleng);
}
	YY_BREAK
case 4:
YY_RULE_SETUP
#line 148 "abrowser.l"
{
  current_context = data;
  sn_advance_column(yyleng);
}
	YY_BREAK
case 5:
YY_RULE_SETUP
#line 153 "abrowser.l"
{

  /* walk over the indentation (if any) */
  for (p = yytext; isspace(*p); sn_advance_column(1), p++);

  /* walk over the jump instruction mneumonic */
  for (; !isspace(*p); sn_advance_column(1), p++);

  /* walk over the whitespace between the opcode and the operand */
  for (; isspace(*p); sn_advance_column(1), p++);

  /* this is a candidate function if it is not a local label */

  if (strncmp(p, ".L", strlen(".L")) != 0 &&
      strncmp(last_label.name, ".L", strlen(".L")) != 0)
  {
    drop_numeric_extn(p);

    sn_insert_xref(SN_REF_TO_FUNCTION, SN_FUNC_DEF, SN_REF_SCOPE_GLOBAL,
                 NULL, last_label.name, NULL, NULL, p, NULL, 
                 sn_current_file(), sn_line(), SN_REF_PASS);
  }
  sn_advance_column(yyleng);
}
	YY_BREAK
case 6:
YY_RULE_SETUP
#line 178 "abrowser.l"
{
  for (p = yytext; !isspace(*p); sn_advance_column(1), p++);
  for (; isspace(*p); sn_advance_column(1), p++);

  sn_insert_symbol(SN_MACRO_DEF, NULL, p, sn_current_file(), sn_line(),
                   sn_column(), sn_line(), sn_column() + (yytext + yyleng - p),
                   0, NULL, NULL, NULL, NULL, sn_line(), sn_column(),
                   sn_line(), sn_column() + (yytext + yyleng - p));

  sn_advance_column(yytext + yyleng - p);
}
	YY_BREAK
case 7:
YY_RULE_SETUP
#line 190 "abrowser.l"
{
  char * x = (char *) strstr(yytext, ",");
  char * y = x;
  while (*x)
  {
    if (isspace(*x))
      {
	x++; break;
      }
    else
      {
	x--;
      }
  }
  sn_advance_column(x - yytext);
  *y = 0;

  sn_insert_symbol(SN_CONS_DEF, NULL, x, sn_current_file(), sn_line(),
                   sn_column(), sn_line(), sn_column() + y - x, 0, NULL,
                   NULL, NULL, NULL, sn_line(), sn_column(), sn_line(),
                   sn_column() + y - x);

  sn_advance_column(y - x + 1); /* add one to jump over the trailing comma */
}
	YY_BREAK
case 8:
YY_RULE_SETUP
#line 215 "abrowser.l"
{
  char * x = (char *) strstr(yytext, ",");
  char * y = x;
  while (*x)
  {
    if (isspace(*x))
    {
      x++;
      break;
    }
    else
    {
      x--;
    }
  }
  sn_advance_column(x - yytext);
  
  *y = 0;

  sn_insert_symbol(SN_GLOB_VAR_DEF, NULL, x, sn_current_file(), sn_line(),
                   sn_column(), sn_line(), sn_column() + y - x, 0, NULL,
                   NULL, NULL, NULL, sn_line(), sn_column(), sn_line(),
                   sn_column() + y - x);

  sn_advance_column(y - x + 1); /* jump over comma also */
}
	YY_BREAK
case 9:
YY_RULE_SETUP
#line 242 "abrowser.l"
{
  char * x = (char *) yytext;

  while (*x)
  {
    if (*x == ' ' || *x == '\t' || *x == ':')
      break;
    else
      x++;
  }
  *x = 0; 

  if (last_label.flag > 0) {
    emit_func_defn();
    last_label.flag = 0;
  }

  if (strncmp(yytext, ".L", strlen(".L")) != 0 &&
      strncmp(yytext, "gcc2_compiled", strlen("gcc2_compiled")) != 0)
  {
    /* we now have a suitable label to store in the database */
    drop_numeric_extn(yytext);

    switch (current_context) {
    case text:
      /* don't insert into the database! just flag the scanner to insert
	 the label name in last_buf the next time we detect a label of
	 _any_ kind. */

#if 0
      assert(last_label.flag != 1);
#endif
      sn_push_line();
      sn_push_column();

      last_label.length = yyleng;
      last_label.flag = 1;

      break;