gdb/parser-defs.h

   1 /* Parser definitions for GDB.
   2
   3    Copyright 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
   4    1997, 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
   5
   6    Modified from expread.y by the Department of Computer Science at the
   7    State University of New York at Buffalo.
   8
   9    This file is part of GDB.
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 59 Temple Place - Suite 330,
  24    Boston, MA 02111-1307, USA.  */
  25
  26 #if !defined (PARSER_DEFS_H)
  27 #define PARSER_DEFS_H 1
  28
  29 #include "doublest.h"
  30
  31 struct block;
  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 /* If expression_context_block is non-zero, then this is the PC within
  43    the block that we want to evaluate expressions at.  When debugging
  44    C or C++ code, we use this to find the exact line we're at, and
  45    then look up the macro definitions active at that point.  */
  46 extern CORE_ADDR expression_context_pc;
  47
  48 /* The innermost context required by the stack and register variables
  49    we've encountered so far. */
  50 extern struct block *innermost_block;
  51
  52 /* The block in which the most recently discovered symbol was found.
  53    FIXME: Should be declared along with lookup_symbol in symtab.h; is not
  54    related specifically to parsing.  */
  55 extern struct block *block_found;
  56
  57 /* Number of arguments seen so far in innermost function call.  */
  58 extern int arglist_len;
  59
  60 /* A string token, either a char-string or bit-string.  Char-strings are
  61    used, for example, for the names of symbols. */
  62
  63 struct stoken
  64   {
  65     /* Pointer to first byte of char-string or first bit of bit-string */
  66     char *ptr;
  67     /* Length of string in bytes for char-string or bits for bit-string */
  68     int length;
  69   };
  70
  71 struct ttype
  72   {
  73     struct stoken stoken;
  74     struct type *type;
  75   };
  76
  77 struct symtoken
  78   {
  79     struct stoken stoken;
  80     struct symbol *sym;
  81     int is_a_field_of_this;
  82   };
  83
  84 struct objc_class_str
  85   {
  86     struct stoken stoken;
  87     struct type *type;
  88     int class;
  89   };
  90
  91
  92 /* For parsing of complicated types.
  93    An array should be preceded in the list by the size of the array.  */
  94 enum type_pieces
  95   {
  96     tp_end = -1,
  97     tp_pointer,
  98     tp_reference,
  99     tp_array,
 100     tp_function,
 101     tp_const,
 102     tp_volatile,
 103     tp_space_identifier
 104   };
 105 /* The stack can contain either an enum type_pieces or an int.  */
 106 union type_stack_elt
 107   {
 108     enum type_pieces piece;
 109     int int_val;
 110   };
 111 extern union type_stack_elt *type_stack;
 112 extern int type_stack_depth, type_stack_size;
 113
 114 extern void write_exp_elt (union exp_element);
 115
 116 extern void write_exp_elt_opcode (enum exp_opcode);
 117
 118 extern void write_exp_elt_sym (struct symbol *);
 119
 120 extern void write_exp_elt_longcst (LONGEST);
 121
 122 extern void write_exp_elt_dblcst (DOUBLEST);
 123
 124 extern void write_exp_elt_type (struct type *);
 125
 126 extern void write_exp_elt_intern (struct internalvar *);
 127
 128 extern void write_exp_string (struct stoken);
 129
 130 extern void write_exp_bitstring (struct stoken);
 131
 132 extern void write_exp_elt_block (struct block *);
 133
 134 extern void write_exp_msymbol (struct minimal_symbol *,
 135                                struct type *, struct type *);
 136
 137 extern void write_dollar_variable (struct stoken str);
 138
 139 extern struct symbol *parse_nested_classes_for_hpacc (char *, int, char **,
 140                                                       int *, char **);
 141
 142 extern char *find_template_name_end (char *);
 143
 144 extern void start_arglist (void);
 145
 146 extern int end_arglist (void);
 147
 148 extern char *copy_name (struct stoken);
 149
 150 extern void push_type (enum type_pieces);
 151
 152 extern void push_type_int (int);
 153
 154 extern void push_type_address_space (char *);
 155
 156 extern enum type_pieces pop_type (void);
 157
 158 extern int pop_type_int (void);
 159
 160 extern int length_of_subexp (struct expression *, int);
 161
 162 extern int dump_subexp (struct expression *, struct ui_file *, int);
 163
 164 extern int dump_subexp_body_standard (struct expression *,
 165                                       struct ui_file *, int);
 166
 167 extern void operator_length (struct expression *, int, int *, int *);
 168
 169 extern void operator_length_standard (struct expression *, int, int *, int *);
 170
 171 extern char *op_name_standard (enum exp_opcode);
 172
 173 extern struct type *follow_types (struct type *);
 174
 175 extern void null_post_parser (struct expression **, int);
 176
 177 /* During parsing of a C expression, the pointer to the next character
 178    is in this variable.  */
 179
 180 extern char *lexptr;
 181
 182 /* After a token has been recognized, this variable points to it.
 183    Currently used only for error reporting.  */
 184 extern char *prev_lexptr;
 185
 186 /* Tokens that refer to names do so with explicit pointer and length,
 187    so they can share the storage that lexptr is parsing.
 188
 189    When it is necessary to pass a name to a function that expects
 190    a null-terminated string, the substring is copied out
 191    into a block of storage that namecopy points to.
 192
 193    namecopy is allocated once, guaranteed big enough, for each parsing.  */
 194
 195 extern char *namecopy;
 196
 197 /* Current depth in parentheses within the expression.  */
 198
 199 extern int paren_depth;
 200
 201 /* Nonzero means stop parsing on first comma (if not within parentheses).  */
 202
 203 extern int comma_terminates;
 204 \f
 205 /* These codes indicate operator precedences for expression printing,
 206    least tightly binding first.  */
 207 /* Adding 1 to a precedence value is done for binary operators,
 208    on the operand which is more tightly bound, so that operators
 209    of equal precedence within that operand will get parentheses.  */
 210 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
 211    they are used as the "surrounding precedence" to force
 212    various kinds of things to be parenthesized.  */
 213 enum precedence
 214   {
 215     PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
 216     PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
 217     PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
 218     PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
 219   };
 220
 221 /* Table mapping opcodes into strings for printing operators
 222    and precedences of the operators.  */
 223
 224 struct op_print
 225   {
 226     char *string;
 227     enum exp_opcode opcode;
 228     /* Precedence of operator.  These values are used only by comparisons.  */
 229     enum precedence precedence;
 230
 231     /* For a binary operator:  1 iff right associate.
 232        For a unary operator:  1 iff postfix. */
 233     int right_assoc;
 234   };
 235
 236 /* Information needed to print, prefixify, and evaluate expressions for
 237    a given language.  */
 238
 239 struct exp_descriptor
 240   {
 241     /* Print subexpression.  */
 242     void (*print_subexp) (struct expression *, int *, struct ui_file *,
 243                           enum precedence);
 244
 245     /* Returns number of exp_elements needed to represent an operator and
 246        the number of subexpressions it takes.  */
 247     void (*operator_length) (struct expression*, int, int*, int *);
 248
 249     /* Name of this operator for dumping purposes.  */
 250     char *(*op_name) (enum exp_opcode);
 251
 252     /* Dump the rest of this (prefix) expression after the operator
 253        itself has been printed.  See dump_subexp_body_standard in
 254        (expprint.c).  */
 255     int (*dump_subexp_body) (struct expression *, struct ui_file *, int);
 256
 257     /* Evaluate an expression.  */
 258     struct value *(*evaluate_exp) (struct type *, struct expression *,
 259                                    int *, enum noside);
 260   };
 261
 262
 263 /* Default descriptor containing standard definitions of all
 264    elements.  */
 265 extern const struct exp_descriptor exp_descriptor_standard;
 266
 267 /* Functions used by language-specific extended operators to (recursively)
 268    print/dump subexpressions.  */
 269
 270 extern void print_subexp (struct expression *, int *, struct ui_file *,
 271                           enum precedence);
 272
 273 extern void print_subexp_standard (struct expression *, int *,
 274                                    struct ui_file *, enum precedence);
 275
 276 /* Function used to avoid direct calls to fprintf
 277    in the code generated by the bison parser.  */
 278
 279 extern void parser_fprintf (FILE *, const char *, ...) ATTR_FORMAT (printf, 2 ,3);
 280
 281 #endif /* PARSER_DEFS_H */