parser-defs.h

早期freebsd实现

/* Parser definitions for GDB.
   Copyright (C) 1986, 1989, 1990, 1991 Free Software Foundation, Inc.
   Modified from expread.y by the Department of Computer Science at the
   State University of New York at Buffalo.

This file is part of GDB.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#if !defined (PARSER_DEFS_H)
#define PARSER_DEFS_H 1

struct std_regs {
	char *name;
	int regnum;
};

extern struct std_regs std_regs[];
extern unsigned num_std_regs;

struct expression *expout;
int expout_size;
int expout_ptr;

/* If this is nonzero, this block is used as the lexical context
   for symbol names.  */

struct block *expression_context_block;

/* The innermost context required by the stack and register variables
   we've encountered so far. */
struct block *innermost_block;

/* The block in which the most recently discovered symbol was found. */
struct block *block_found;

/* Number of arguments seen so far in innermost function call.  */
int arglist_len;

/* Data structure for saving values of arglist_len
   for function calls whose arguments contain other function calls.  */

struct funcall
  {
    struct funcall *next;
    int arglist_len;
  };

struct funcall *funcall_chain;

/* This kind of datum is used to represent the name
   of a symbol token.  */

struct stoken
  {
    char *ptr;
    int length;
  };

struct ttype
  {
    struct stoken stoken;
    struct type *type;
  };

struct symtoken
  {
    struct stoken stoken;
    struct symbol *sym;
    int is_a_field_of_this;
  };

/* For parsing of complicated types.
   An array should be preceded in the list by the size of the array.  */
enum type_pieces
  {tp_end = -1, tp_pointer, tp_reference, tp_array, tp_function};
/* The stack can contain either an enum type_pieces or an int.  */
union type_stack_elt {
  enum type_pieces piece;
  int int_val;
};
union type_stack_elt *type_stack;
int type_stack_depth, type_stack_size;

extern void
write_exp_elt PARAMS ((union exp_element));

extern void
write_exp_elt_opcode PARAMS ((enum exp_opcode));

extern void
write_exp_elt_sym PARAMS ((struct symbol *));

extern void
write_exp_elt_longcst PARAMS ((LONGEST));

extern void
write_exp_elt_dblcst PARAMS ((double));

extern void
write_exp_elt_type PARAMS ((struct type *));

extern void
write_exp_elt_intern PARAMS ((struct internalvar *));

extern void
write_exp_string PARAMS ((struct stoken));

extern void
start_arglist PARAMS ((void));

extern int
end_arglist PARAMS ((void));

extern void
free_funcalls PARAMS ((void));

extern char *
copy_name PARAMS ((struct stoken));

extern void 
push_type PARAMS ((enum type_pieces));

extern void
push_type_int PARAMS ((int));

extern enum type_pieces 
pop_type PARAMS ((void));

extern int
pop_type_int PARAMS ((void));

/* During parsing of a C expression, the pointer to the next character
   is in this variable.  */

char *lexptr;

/* Tokens that refer to names do so with explicit pointer and length,
   so they can share the storage that lexptr is parsing.

   When it is necessary to pass a name to a function that expects
   a null-terminated string, the substring is copied out
   into a block of storage that namecopy points to.

   namecopy is allocated once, guaranteed big enough, for each parsing.  */

char *namecopy;

/* Current depth in parentheses within the expression.  */

int paren_depth;

/* Nonzero means stop parsing on first comma (if not within parentheses).  */

int comma_terminates;

/* These codes indicate operator precedences for expression printing,
   least tightly binding first.  */
/* Adding 1 to a precedence value is done for binary operators,
   on the operand which is more tightly bound, so that operators
   of equal precedence within that operand will get parentheses.  */
/* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
   they are used as the "surrounding precedence" to force
   various kinds of things to be parenthesized.  */
enum precedence
{ PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_OR, PREC_AND,
  PREC_LOGIOR, PREC_LOGAND, PREC_LOGXOR, PREC_EQUAL, PREC_ORDER,
  PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
  PREC_HYPER, PREC_PREFIX, PREC_SUFFIX };

/* Table mapping opcodes into strings for printing operators
   and precedences of the operators.  */

struct op_print
{
  char *string;
  enum exp_opcode opcode;
  /* Precedence of operator.  These values are used only by comparisons.  */
  enum precedence precedence;
  int right_assoc;
};

#endif	/* PARSER_DEFS_H */