gdb/parser-defs.h

   1 /* Parser definitions for GDB.
   2    Copyright (C) 1986, 1989, 1990, 1991 Free Software Foundation, Inc.
   3    Modified from expread.y by the Department of Computer Science at the
   4    State University of New York at Buffalo.
   5
   6 This file is part of GDB.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  21
  22 #if !defined (PARSER_DEFS_H)
  23 #define PARSER_DEFS_H 1
  24
  25 struct std_regs {
  26         char *name;
  27         int regnum;
  28 };
  29
  30 extern struct std_regs std_regs[];
  31 extern unsigned num_std_regs;
  32
  33 struct expression *expout;
  34 int expout_size;
  35 int expout_ptr;
  36
  37 /* If this is nonzero, this block is used as the lexical context
  38    for symbol names.  */
  39
  40 struct block *expression_context_block;
  41
  42 /* The innermost context required by the stack and register variables
  43    we've encountered so far. */
  44 struct block *innermost_block;
  45
  46 /* The block in which the most recently discovered symbol was found. */
  47 struct block *block_found;
  48
  49 /* Number of arguments seen so far in innermost function call.  */
  50 int arglist_len;
  51
  52 /* Data structure for saving values of arglist_len
  53    for function calls whose arguments contain other function calls.  */
  54
  55 struct funcall
  56   {
  57     struct funcall *next;
  58     int arglist_len;
  59   };
  60
  61 struct funcall *funcall_chain;
  62
  63 /* This kind of datum is used to represent the name
  64    of a symbol token.  */
  65
  66 struct stoken
  67   {
  68     char *ptr;
  69     int length;
  70   };
  71
  72 struct ttype
  73   {
  74     struct stoken stoken;
  75     struct type *type;
  76   };
  77
  78 struct symtoken
  79   {
  80     struct stoken stoken;
  81     struct symbol *sym;
  82     int is_a_field_of_this;
  83   };
  84
  85 /* For parsing of complicated types.
  86    An array should be preceded in the list by the size of the array.  */
  87 enum type_pieces
  88   {tp_end = -1, tp_pointer, tp_reference, tp_array, tp_function};
  89 /* The stack can contain either an enum type_pieces or an int.  */
  90 union type_stack_elt {
  91   enum type_pieces piece;
  92   int int_val;
  93 };
  94 union type_stack_elt *type_stack;
  95 int type_stack_depth, type_stack_size;
  96
  97 extern void
  98 write_exp_elt PARAMS ((union exp_element));
  99
 100 extern void
 101 write_exp_elt_opcode PARAMS ((enum exp_opcode));
 102
 103 extern void
 104 write_exp_elt_sym PARAMS ((struct symbol *));
 105
 106 extern void
 107 write_exp_elt_longcst PARAMS ((LONGEST));
 108
 109 extern void
 110 write_exp_elt_dblcst PARAMS ((double));
 111
 112 extern void
 113 write_exp_elt_type PARAMS ((struct type *));
 114
 115 extern void
 116 write_exp_elt_intern PARAMS ((struct internalvar *));
 117
 118 extern void
 119 write_exp_string PARAMS ((struct stoken));
 120
 121 extern void
 122 start_arglist PARAMS ((void));
 123
 124 extern int
 125 end_arglist PARAMS ((void));
 126
 127 extern void
 128 free_funcalls PARAMS ((void));
 129
 130 extern char *
 131 copy_name PARAMS ((struct stoken));
 132
 133 extern void
 134 push_type PARAMS ((enum type_pieces));
 135
 136 extern void
 137 push_type_int PARAMS ((int));
 138
 139 extern enum type_pieces
 140 pop_type PARAMS ((void));
 141
 142 extern int
 143 pop_type_int PARAMS ((void));
 144
 145 /* During parsing of a C expression, the pointer to the next character
 146    is in this variable.  */
 147
 148 char *lexptr;
 149
 150 /* Tokens that refer to names do so with explicit pointer and length,
 151    so they can share the storage that lexptr is parsing.
 152
 153    When it is necessary to pass a name to a function that expects
 154    a null-terminated string, the substring is copied out
 155    into a block of storage that namecopy points to.
 156
 157    namecopy is allocated once, guaranteed big enough, for each parsing.  */
 158
 159 char *namecopy;
 160
 161 /* Current depth in parentheses within the expression.  */
 162
 163 int paren_depth;
 164
 165 /* Nonzero means stop parsing on first comma (if not within parentheses).  */
 166
 167 int comma_terminates;
 168 \f
 169 /* These codes indicate operator precedences for expression printing,
 170    least tightly binding first.  */
 171 /* Adding 1 to a precedence value is done for binary operators,
 172    on the operand which is more tightly bound, so that operators
 173    of equal precedence within that operand will get parentheses.  */
 174 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
 175    they are used as the "surrounding precedence" to force
 176    various kinds of things to be parenthesized.  */
 177 enum precedence
 178 { PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
 179   PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
 180   PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
 181   PREC_HYPER, PREC_PREFIX, PREC_SUFFIX };
 182
 183 /* Table mapping opcodes into strings for printing operators
 184    and precedences of the operators.  */
 185
 186 struct op_print
 187 {
 188   char *string;
 189   enum exp_opcode opcode;
 190   /* Precedence of operator.  These values are used only by comparisons.  */
 191   enum precedence precedence;
 192   int right_assoc;
 193 };
 194
 195 #endif  /* PARSER_DEFS_H */