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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 extern struct expression *expout;
  34 extern int expout_size;
  35 extern int expout_ptr;
  36
  37 /* If this is nonzero, this block is used as the lexical context
  38    for symbol names.  */
  39
  40 extern struct block *expression_context_block;
  41
  42 /* The innermost context required by the stack and register variables
  43    we've encountered so far. */
  44 extern struct block *innermost_block;
  45
  46 /* The block in which the most recently discovered symbol was found.
  47    FIXME: Should be declared along with lookup_symbol in symtab.h; is not
  48    related specifically to parsing.  */
  49 extern struct block *block_found;
  50
  51 /* Number of arguments seen so far in innermost function call.  */
  52 extern int arglist_len;
  53
  54 /* A string token, either a char-string or bit-string.  Char-strings are
  55    used, for example, for the names of symbols. */
  56
  57 struct stoken
  58   {
  59     /* Pointer to first byte of char-string or first bit of bit-string */
  60     char *ptr;
  61     /* Length of string in bytes for char-string or bits for bit-string */
  62     int length;
  63   };
  64
  65 struct ttype
  66   {
  67     struct stoken stoken;
  68     struct type *type;
  69   };
  70
  71 struct symtoken
  72   {
  73     struct stoken stoken;
  74     struct symbol *sym;
  75     int is_a_field_of_this;
  76   };
  77
  78 /* For parsing of complicated types.
  79    An array should be preceded in the list by the size of the array.  */
  80 enum type_pieces
  81   {tp_end = -1, tp_pointer, tp_reference, tp_array, tp_function};
  82 /* The stack can contain either an enum type_pieces or an int.  */
  83 union type_stack_elt {
  84   enum type_pieces piece;
  85   int int_val;
  86 };
  87 extern union type_stack_elt *type_stack;
  88 extern int type_stack_depth, type_stack_size;
  89
  90 extern void write_exp_elt PARAMS ((union exp_element));
  91
  92 extern void write_exp_elt_opcode PARAMS ((enum exp_opcode));
  93
  94 extern void write_exp_elt_sym PARAMS ((struct symbol *));
  95
  96 extern void write_exp_elt_longcst PARAMS ((LONGEST));
  97
  98 extern void write_exp_elt_dblcst PARAMS ((double));
  99
 100 extern void write_exp_elt_type PARAMS ((struct type *));
 101
 102 extern void write_exp_elt_intern PARAMS ((struct internalvar *));
 103
 104 extern void write_exp_string PARAMS ((struct stoken));
 105
 106 extern void write_exp_bitstring PARAMS ((struct stoken));
 107
 108 extern void write_exp_elt_block PARAMS ((struct block *));
 109
 110 extern void write_exp_msymbol PARAMS ((struct minimal_symbol *,
 111                                        struct type *, struct type *));
 112
 113 extern void
 114 start_arglist PARAMS ((void));
 115
 116 extern int
 117 end_arglist PARAMS ((void));
 118
 119 extern char *
 120 copy_name PARAMS ((struct stoken));
 121
 122 extern void
 123 push_type PARAMS ((enum type_pieces));
 124
 125 extern void
 126 push_type_int PARAMS ((int));
 127
 128 extern enum type_pieces
 129 pop_type PARAMS ((void));
 130
 131 extern int
 132 pop_type_int PARAMS ((void));
 133
 134 extern struct type *follow_types PARAMS ((struct type *));
 135
 136 /* During parsing of a C expression, the pointer to the next character
 137    is in this variable.  */
 138
 139 extern char *lexptr;
 140
 141 /* Tokens that refer to names do so with explicit pointer and length,
 142    so they can share the storage that lexptr is parsing.
 143
 144    When it is necessary to pass a name to a function that expects
 145    a null-terminated string, the substring is copied out
 146    into a block of storage that namecopy points to.
 147
 148    namecopy is allocated once, guaranteed big enough, for each parsing.  */
 149
 150 extern char *namecopy;
 151
 152 /* Current depth in parentheses within the expression.  */
 153
 154 extern int paren_depth;
 155
 156 /* Nonzero means stop parsing on first comma (if not within parentheses).  */
 157
 158 extern int comma_terminates;
 159 \f
 160 /* These codes indicate operator precedences for expression printing,
 161    least tightly binding first.  */
 162 /* Adding 1 to a precedence value is done for binary operators,
 163    on the operand which is more tightly bound, so that operators
 164    of equal precedence within that operand will get parentheses.  */
 165 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
 166    they are used as the "surrounding precedence" to force
 167    various kinds of things to be parenthesized.  */
 168 enum precedence
 169 { PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
 170   PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
 171   PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
 172   PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION };
 173
 174 /* Table mapping opcodes into strings for printing operators
 175    and precedences of the operators.  */
 176
 177 struct op_print
 178 {
 179   char *string;
 180   enum exp_opcode opcode;
 181   /* Precedence of operator.  These values are used only by comparisons.  */
 182   enum precedence precedence;
 183
 184   /* For a binary operator:  1 iff right associate.
 185      For a unary operator:  1 iff postfix. */
 186   int right_assoc;
 187 };
 188
 189 #endif  /* PARSER_DEFS_H */