c-exp.tab.c

早期freebsd实现

# line 30 "./c-exp.y"

#include <stdio.h>
#include <string.h>
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "frame.h"
#include "expression.h"
#include "parser-defs.h"
#include "value.h"
#include "language.h"
#include "bfd.h"
#include "symfile.h"
#include "objfiles.h"

/* These MUST be included in any grammar file!!!! Please choose unique names!
   Note that this are a combined list of variables that can be produced
   by any one of bison, byacc, or yacc. */
#define	yymaxdepth c_maxdepth
#define	yyparse	c_parse
#define	yylex	c_lex
#define	yyerror	c_error
#define	yylval	c_lval
#define	yychar	c_char
#define	yydebug	c_debug
#define	yypact	c_pact	
#define	yyr1	c_r1			
#define	yyr2	c_r2			
#define	yydef	c_def		
#define	yychk	c_chk		
#define	yypgo	c_pgo		
#define	yyact	c_act		
#define	yyexca	c_exca
#define yyerrflag c_errflag
#define yynerrs	c_nerrs
#define	yyps	c_ps
#define	yypv	c_pv
#define	yys	c_s
#define	yy_yys	c_yys
#define	yystate	c_state
#define	yytmp	c_tmp
#define	yyv	c_v
#define	yy_yyv	c_yyv
#define	yyval	c_val
#define	yylloc	c_lloc
#define yyss	c_yyss		/* byacc */
#define	yyssp	c_yysp		/* byacc */
#define	yyvs	c_yyvs		/* byacc */
#define	yyvsp	c_yyvsp		/* byacc */

int
yyparse PARAMS ((void));

int
yylex PARAMS ((void));

void
yyerror PARAMS ((char *));

/* #define	YYDEBUG	1 */


# line 97 "./c-exp.y"
typedef union 
  {
    LONGEST lval;
    unsigned LONGEST ulval;
    double dval;
    struct symbol *sym;
    struct type *tval;
    struct stoken sval;
    struct ttype tsym;
    struct symtoken ssym;
    int voidval;
    struct block *bval;
    enum exp_opcode opcode;
    struct internalvar *ivar;

    struct type **tvec;
    int *ivec;
  } YYSTYPE;

# line 117 "./c-exp.y"
/* YYSTYPE gets defined by %union */
static int
parse_number PARAMS ((char *, int, int, YYSTYPE *));
# define INT 257
# define CHAR 258
# define UINT 259
# define FLOAT 260
# define STRING 261
# define NAME 262
# define TYPENAME 263
# define NAME_OR_INT 264
# define NAME_OR_UINT 265
# define STRUCT 266
# define CLASS 267
# define UNION 268
# define ENUM 269
# define SIZEOF 270
# define UNSIGNED 271
# define COLONCOLON 272
# define TEMPLATE 273
# define ERROR 274
# define SIGNED_KEYWORD 275
# define LONG 276
# define SHORT 277
# define INT_KEYWORD 278
# define CONST_KEYWORD 279
# define VOLATILE_KEYWORD 280
# define LAST 281
# define REGNAME 282
# define VARIABLE 283
# define ASSIGN_MODIFY 284
# define THIS 285
# define ABOVE_COMMA 286
# define OROR 287
# define ANDAND 288
# define EQUAL 289
# define NOTEQUAL 290
# define LEQ 291
# define GEQ 292
# define LSH 293
# define RSH 294
# define UNARY 295
# define INCREMENT 296
# define DECREMENT 297
# define ARROW 298
# define BLOCKNAME 299

# line 197 "./c-exp.y"
/* Ensure that if the generated parser contains any calls to malloc/realloc,
   that they get mapped to xmalloc/xrealloc.  We have to do this here
   rather than earlier in the file because this is the first point after
   the place where the SVR4 yacc includes <malloc.h>, and if we do it
   before that, then the remapped declarations in <malloc.h> will collide
   with the ones in "defs.h". */

#define malloc	xmalloc
#define realloc	xrealloc
#define yyclearin yychar = -1
#define yyerrok yyerrflag = 0
extern int yychar;
extern int yyerrflag;
#ifndef YYMAXDEPTH
#define YYMAXDEPTH 150
#endif
YYSTYPE yylval, yyval;
# define YYERRCODE 256

# line 946 "./c-exp.y"


/* Take care of parsing a number (anything that starts with a digit).
   Set yylval and return the token type; update lexptr.
   LEN is the number of characters in it.  */

/*** Needs some error checking for the float case ***/

static int
parse_number (p, len, parsed_float, putithere)
     register char *p;
     register int len;
     int parsed_float;
     YYSTYPE *putithere;
{
  register LONGEST n = 0;
  register LONGEST prevn = 0;
  register int i;
  register int c;
  register int base = input_radix;
  int unsigned_p = 0;

  if (parsed_float)
    {
      /* It's a float since it contains a point or an exponent.  */
      putithere->dval = atof (p);
      return FLOAT;
    }

  /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
  if (p[0] == '0')
    switch (p[1])
      {
      case 'x':
      case 'X':
	if (len >= 3)
	  {
	    p += 2;
	    base = 16;
	    len -= 2;
	  }
	break;

      case 't':
      case 'T':
      case 'd':
      case 'D':
	if (len >= 3)
	  {
	    p += 2;
	    base = 10;
	    len -= 2;
	  }
	break;

      default:
	base = 8;
	break;
      }

  while (len-- > 0)
    {
      c = *p++;
      if (c >= 'A' && c <= 'Z')
	c += 'a' - 'A';
      if (c != 'l' && c != 'u')
	n *= base;
      if (c >= '0' && c <= '9')
	n += i = c - '0';
      else
	{
	  if (base > 10 && c >= 'a' && c <= 'f')
	    n += i = c - 'a' + 10;
	  else if (len == 0 && c == 'l')
	    ;
	  else if (len == 0 && c == 'u')
	    unsigned_p = 1;
	  else
	    return ERROR;	/* Char not a digit */
	}
      if (i >= base)
	return ERROR;		/* Invalid digit in this base */
      /* Portably test for overflow (only works for nonzero values, so make
	 a second check for zero).  */
      if((prevn >= n) && n != 0)
	 unsigned_p=1;		/* Try something unsigned */
      /* If range checking enabled, portably test for unsigned overflow.  */
      if(RANGE_CHECK && n!=0)
      {	
	 if((unsigned_p && (unsigned)prevn >= (unsigned)n))
	    range_error("Overflow on numeric constant.");	 
      }
      prevn=n;
    }

  if (unsigned_p)
    {
      putithere->ulval = n;
      return UINT;
    }
  else
    {
      putithere->lval = n;
      return INT;
    }
}

struct token
{
  char *operator;
  int token;
  enum exp_opcode opcode;
};

const static struct token tokentab3[] =
  {
    {">>=", ASSIGN_MODIFY, BINOP_RSH},
    {"<<=", ASSIGN_MODIFY, BINOP_LSH}
  };

const static struct token tokentab2[] =
  {
    {"+=", ASSIGN_MODIFY, BINOP_ADD},
    {"-=", ASSIGN_MODIFY, BINOP_SUB},
    {"*=", ASSIGN_MODIFY, BINOP_MUL},
    {"/=", ASSIGN_MODIFY, BINOP_DIV},
    {"%=", ASSIGN_MODIFY, BINOP_REM},
    {"|=", ASSIGN_MODIFY, BINOP_LOGIOR},
    {"&=", ASSIGN_MODIFY, BINOP_LOGAND},
    {"^=", ASSIGN_MODIFY, BINOP_LOGXOR},
    {"++", INCREMENT, BINOP_END},
    {"--", DECREMENT, BINOP_END},
    {"->", ARROW, BINOP_END},
    {"&&", ANDAND, BINOP_END},
    {"||", OROR, BINOP_END},
    {"::", COLONCOLON, BINOP_END},
    {"<<", LSH, BINOP_END},
    {">>", RSH, BINOP_END},
    {"==", EQUAL, BINOP_END},
    {"!=", NOTEQUAL, BINOP_END},
    {"<=", LEQ, BINOP_END},
    {">=", GEQ, BINOP_END}
  };

/* Read one token, getting characters through lexptr.  */

int
yylex ()
{
  register int c;
  register int namelen;
  register unsigned i;
  register char *tokstart;

 retry:

  tokstart = lexptr;
  /* See if it is a special token of length 3.  */
  for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
    if (!strncmp (tokstart, tokentab3[i].operator, 3))
      {
	lexptr += 3;
	yylval.opcode = tokentab3[i].opcode;
	return tokentab3[i].token;
      }

  /* See if it is a special token of length 2.  */
  for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
    if (!strncmp (tokstart, tokentab2[i].operator, 2))
      {
	lexptr += 2;
	yylval.opcode = tokentab2[i].opcode;
	return tokentab2[i].token;
      }

  switch (c = *tokstart)
    {
    case 0:
      return 0;

    case ' ':
    case '\t':
    case '\n':
      lexptr++;
      goto retry;

    case '\'':
      /* We either have a character constant ('0' or '\177' for example)
	 or we have a quoted symbol reference ('foo(int,int)' in C++
	 for example). */
      lexptr++;
      c = *lexptr++;
      if (c == '\\')
	c = parse_escape (&lexptr);
      yylval.lval = c;
      c = *lexptr++;
      if (c != '\'')
	{
	  namelen = skip_quoted (tokstart) - tokstart;
	  if (namelen > 2)
	    {
	      lexptr = tokstart + namelen;
	      namelen -= 2;
	      tokstart++;
	      goto tryname;
	    }
	  error ("Invalid character constant.");
	}
      return CHAR;

    case '(':
      paren_depth++;
      lexptr++;
      return c;

    case ')':
      if (paren_depth == 0)
	return 0;
      paren_depth--;
      lexptr++;
      return c;

    case ',':
      if (comma_terminates && paren_depth == 0)
	return 0;
      lexptr++;
      return c;

    case '.':
      /* Might be a floating point number.  */
      if (lexptr[1] < '0' || lexptr[1] > '9')
	goto symbol;		/* Nope, must be a symbol. */
      /* FALL THRU into number case.  */

    case '0':
    case '1':
    case '2':
    case '3':
    case '4':
    case '5':
    case '6':
    case '7':
    case '8':
    case '9':
      {
	/* It's a number.  */
	int got_dot = 0, got_e = 0, toktype;
	register char *p = tokstart;
	int hex = input_radix > 10;

	if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
	  {
	    p += 2;
	    hex = 1;
	  }
	else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
	  {
	    p += 2;
	    hex = 0;
	  }

	for (;; ++p)
	  {
	    if (!hex && !got_e && (*p == 'e' || *p == 'E'))
	      got_dot = got_e = 1;
	    else if (!hex && !got_dot && *p == '.')
	      got_dot = 1;
	    else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
		     && (*p == '-' || *p == '+'))
	      /* This is the sign of the exponent, not the end of the
		 number.  */
	      continue;
	    /* We will take any letters or digits.  parse_number will
	       complain if past the radix, or if L or U are not final.  */
	    else if ((*p < '0' || *p > '9')
		     && ((*p < 'a' || *p > 'z')
				  && (*p < 'A' || *p > 'Z')))
	      break;
	  }
	toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
        if (toktype == ERROR)
	  {
	    char *err_copy = (char *) alloca (p - tokstart + 1);

	    memcpy (err_copy, tokstart, p - tokstart);
	    err_copy[p - tokstart] = 0;
	    error ("Invalid number \"%s\".", err_copy);
	  }
	lexptr = p;