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 /* A string token, either a char-string or bit-string.  Char-strings are
  64    used, for example, for the names of symbols. */
  65
  66 struct stoken
  67   {
  68     /* Pointer to first byte of char-string or first bit of bit-string */
  69     char *ptr;
  70     /* Length of string in bytes for char-string or bits for bit-string */
  71     int length;
  72   };
  73
  74 struct ttype
  75   {
  76     struct stoken stoken;
  77     struct type *type;
  78   };
  79
  80 struct symtoken
  81   {
  82     struct stoken stoken;
  83     struct symbol *sym;
  84     int is_a_field_of_this;
  85   };
  86
  87 /* For parsing of complicated types.
  88    An array should be preceded in the list by the size of the array.  */
  89 enum type_pieces
  90   {tp_end = -1, tp_pointer, tp_reference, tp_array, tp_function};
  91 /* The stack can contain either an enum type_pieces or an int.  */
  92 union type_stack_elt {
  93   enum type_pieces piece;
  94   int int_val;
  95 };
  96 union type_stack_elt *type_stack;
  97 int type_stack_depth, type_stack_size;
  98
  99 extern void
 100 write_exp_elt PARAMS ((union exp_element));
 101
 102 extern void
 103 write_exp_elt_opcode PARAMS ((enum exp_opcode));
 104
 105 extern void
 106 write_exp_elt_sym PARAMS ((struct symbol *));
 107
 108 extern void
 109 write_exp_elt_longcst PARAMS ((LONGEST));
 110
 111 extern void
 112 write_exp_elt_dblcst PARAMS ((double));
 113
 114 extern void
 115 write_exp_elt_type PARAMS ((struct type *));
 116
 117 extern void
 118 write_exp_elt_intern PARAMS ((struct internalvar *));
 119
 120 extern void
 121 write_exp_string PARAMS ((struct stoken));
 122
 123 extern void
 124 write_exp_bitstring PARAMS ((struct stoken));
 125
 126 extern void
 127 start_arglist PARAMS ((void));
 128
 129 extern int
 130 end_arglist PARAMS ((void));
 131
 132 extern void
 133 free_funcalls PARAMS ((void));
 134
 135 extern char *
 136 copy_name PARAMS ((struct stoken));
 137
 138 extern void
 139 push_type PARAMS ((enum type_pieces));
 140
 141 extern void
 142 push_type_int PARAMS ((int));
 143
 144 extern enum type_pieces
 145 pop_type PARAMS ((void));
 146
 147 extern int
 148 pop_type_int PARAMS ((void));
 149
 150 /* During parsing of a C expression, the pointer to the next character
 151    is in this variable.  */
 152
 153 char *lexptr;
 154
 155 /* Tokens that refer to names do so with explicit pointer and length,
 156    so they can share the storage that lexptr is parsing.
 157
 158    When it is necessary to pass a name to a function that expects
 159    a null-terminated string, the substring is copied out
 160    into a block of storage that namecopy points to.
 161
 162    namecopy is allocated once, guaranteed big enough, for each parsing.  */
 163
 164 char *namecopy;
 165
 166 /* Current depth in parentheses within the expression.  */
 167
 168 int paren_depth;
 169
 170 /* Nonzero means stop parsing on first comma (if not within parentheses).  */
 171
 172 int comma_terminates;
 173 \f
 174 /* These codes indicate operator precedences for expression printing,
 175    least tightly binding first.  */
 176 /* Adding 1 to a precedence value is done for binary operators,
 177    on the operand which is more tightly bound, so that operators
 178    of equal precedence within that operand will get parentheses.  */
 179 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
 180    they are used as the "surrounding precedence" to force
 181    various kinds of things to be parenthesized.  */
 182 enum precedence
 183 { PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
 184   PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
 185   PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
 186   PREC_HYPER, PREC_PREFIX, PREC_SUFFIX };
 187
 188 /* Table mapping opcodes into strings for printing operators
 189    and precedences of the operators.  */
 190
 191 struct op_print
 192 {
 193   char *string;
 194   enum exp_opcode opcode;
 195   /* Precedence of operator.  These values are used only by comparisons.  */
 196   enum precedence precedence;
 197   int right_assoc;
 198 };
 199
 200 #endif  /* PARSER_DEFS_H */