gdb/parser-defs.h

   1 /* Parser definitions for GDB.
   2
   3    Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
   4    1998, 1999, 2000, 2002, 2007, 2008, 2009, 2010
   5    Free Software Foundation, Inc.
   6
   7    Modified from expread.y by the Department of Computer Science at the
   8    State University of New York at Buffalo.
   9
  10    This file is part of GDB.
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  24
  25 #if !defined (PARSER_DEFS_H)
  26 #define PARSER_DEFS_H 1
  27
  28 #include "doublest.h"
  29
  30 struct block;
  31
  32 extern int parser_debug;
  33
  34 extern struct expression *expout;
  35 extern int expout_size;
  36 extern int expout_ptr;
  37
  38 #define parse_gdbarch (expout->gdbarch)
  39 #define parse_language (expout->language_defn)
  40
  41 /* If this is nonzero, this block is used as the lexical context
  42    for symbol names.  */
  43
  44 extern struct block *expression_context_block;
  45
  46 /* If expression_context_block is non-zero, then this is the PC within
  47    the block that we want to evaluate expressions at.  When debugging
  48    C or C++ code, we use this to find the exact line we're at, and
  49    then look up the macro definitions active at that point.  */
  50 extern CORE_ADDR expression_context_pc;
  51
  52 /* The innermost context required by the stack and register variables
  53    we've encountered so far. */
  54 extern struct block *innermost_block;
  55
  56 /* The block in which the most recently discovered symbol was found.
  57    FIXME: Should be declared along with lookup_symbol in symtab.h; is not
  58    related specifically to parsing.  */
  59 extern struct block *block_found;
  60
  61 /* Number of arguments seen so far in innermost function call.  */
  62 extern int arglist_len;
  63
  64 /* A string token, either a char-string or bit-string.  Char-strings are
  65    used, for example, for the names of symbols. */
  66
  67 struct stoken
  68   {
  69     /* Pointer to first byte of char-string or first bit of bit-string */
  70     char *ptr;
  71     /* Length of string in bytes for char-string or bits for bit-string */
  72     int length;
  73   };
  74
  75 struct typed_stoken
  76   {
  77     /* A language-specific type field.  */
  78     int type;
  79     /* Pointer to first byte of char-string or first bit of bit-string */
  80     char *ptr;
  81     /* Length of string in bytes for char-string or bits for bit-string */
  82     int length;
  83   };
  84
  85 struct stoken_vector
  86   {
  87     int len;
  88     struct typed_stoken *tokens;
  89   };
  90
  91 struct ttype
  92   {
  93     struct stoken stoken;
  94     struct type *type;
  95   };
  96
  97 struct symtoken
  98   {
  99     struct stoken stoken;
 100     struct symbol *sym;
 101     int is_a_field_of_this;
 102   };
 103
 104 struct objc_class_str
 105   {
 106     struct stoken stoken;
 107     struct type *type;
 108     int class;
 109   };
 110
 111
 112 /* For parsing of complicated types.
 113    An array should be preceded in the list by the size of the array.  */
 114 enum type_pieces
 115   {
 116     tp_end = -1,
 117     tp_pointer,
 118     tp_reference,
 119     tp_array,
 120     tp_function,
 121     tp_const,
 122     tp_volatile,
 123     tp_space_identifier
 124   };
 125 /* The stack can contain either an enum type_pieces or an int.  */
 126 union type_stack_elt
 127   {
 128     enum type_pieces piece;
 129     int int_val;
 130   };
 131 extern union type_stack_elt *type_stack;
 132 extern int type_stack_depth, type_stack_size;
 133
 134 extern void write_exp_elt (union exp_element);
 135
 136 extern void write_exp_elt_opcode (enum exp_opcode);
 137
 138 extern void write_exp_elt_sym (struct symbol *);
 139
 140 extern void write_exp_elt_longcst (LONGEST);
 141
 142 extern void write_exp_elt_dblcst (DOUBLEST);
 143
 144 extern void write_exp_elt_decfloatcst (gdb_byte *);
 145
 146 extern void write_exp_elt_type (struct type *);
 147
 148 extern void write_exp_elt_intern (struct internalvar *);
 149
 150 extern void write_exp_string (struct stoken);
 151
 152 void write_exp_string_vector (int type, struct stoken_vector *vec);
 153
 154 extern void write_exp_bitstring (struct stoken);
 155
 156 extern void write_exp_elt_block (struct block *);
 157
 158 extern void write_exp_elt_objfile (struct objfile *objfile);
 159
 160 extern void write_exp_msymbol (struct minimal_symbol *);
 161
 162 extern void write_dollar_variable (struct stoken str);
 163
 164 extern void mark_struct_expression (void);
 165
 166 extern char *find_template_name_end (char *);
 167
 168 extern void start_arglist (void);
 169
 170 extern int end_arglist (void);
 171
 172 extern char *copy_name (struct stoken);
 173
 174 extern void push_type (enum type_pieces);
 175
 176 extern void push_type_int (int);
 177
 178 extern void push_type_address_space (char *);
 179
 180 extern enum type_pieces pop_type (void);
 181
 182 extern int pop_type_int (void);
 183
 184 extern int length_of_subexp (struct expression *, int);
 185
 186 extern int dump_subexp (struct expression *, struct ui_file *, int);
 187
 188 extern int dump_subexp_body_standard (struct expression *,
 189                                       struct ui_file *, int);
 190
 191 extern void operator_length (struct expression *, int, int *, int *);
 192
 193 extern void operator_length_standard (struct expression *, int, int *, int *);
 194
 195 extern char *op_name_standard (enum exp_opcode);
 196
 197 extern struct type *follow_types (struct type *);
 198
 199 extern void null_post_parser (struct expression **, int);
 200
 201 /* During parsing of a C expression, the pointer to the next character
 202    is in this variable.  */
 203
 204 extern char *lexptr;
 205
 206 /* After a token has been recognized, this variable points to it.
 207    Currently used only for error reporting.  */
 208 extern char *prev_lexptr;
 209
 210 /* Tokens that refer to names do so with explicit pointer and length,
 211    so they can share the storage that lexptr is parsing.
 212
 213    When it is necessary to pass a name to a function that expects
 214    a null-terminated string, the substring is copied out
 215    into a block of storage that namecopy points to.
 216
 217    namecopy is allocated once, guaranteed big enough, for each parsing.  */
 218
 219 extern char *namecopy;
 220
 221 /* Current depth in parentheses within the expression.  */
 222
 223 extern int paren_depth;
 224
 225 /* Nonzero means stop parsing on first comma (if not within parentheses).  */
 226
 227 extern int comma_terminates;
 228 \f
 229 /* These codes indicate operator precedences for expression printing,
 230    least tightly binding first.  */
 231 /* Adding 1 to a precedence value is done for binary operators,
 232    on the operand which is more tightly bound, so that operators
 233    of equal precedence within that operand will get parentheses.  */
 234 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
 235    they are used as the "surrounding precedence" to force
 236    various kinds of things to be parenthesized.  */
 237 enum precedence
 238   {
 239     PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
 240     PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
 241     PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
 242     PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
 243   };
 244
 245 /* Table mapping opcodes into strings for printing operators
 246    and precedences of the operators.  */
 247
 248 struct op_print
 249   {
 250     char *string;
 251     enum exp_opcode opcode;
 252     /* Precedence of operator.  These values are used only by comparisons.  */
 253     enum precedence precedence;
 254
 255     /* For a binary operator:  1 iff right associate.
 256        For a unary operator:  1 iff postfix. */
 257     int right_assoc;
 258   };
 259
 260 /* Information needed to print, prefixify, and evaluate expressions for
 261    a given language.  */
 262
 263 struct exp_descriptor
 264   {
 265     /* Print subexpression.  */
 266     void (*print_subexp) (struct expression *, int *, struct ui_file *,
 267                           enum precedence);
 268
 269     /* Returns number of exp_elements needed to represent an operator and
 270        the number of subexpressions it takes.  */
 271     void (*operator_length) (struct expression*, int, int*, int *);
 272
 273     /* Name of this operator for dumping purposes.  */
 274     char *(*op_name) (enum exp_opcode);
 275
 276     /* Dump the rest of this (prefix) expression after the operator
 277        itself has been printed.  See dump_subexp_body_standard in
 278        (expprint.c).  */
 279     int (*dump_subexp_body) (struct expression *, struct ui_file *, int);
 280
 281     /* Evaluate an expression.  */
 282     struct value *(*evaluate_exp) (struct type *, struct expression *,
 283                                    int *, enum noside);
 284   };
 285
 286
 287 /* Default descriptor containing standard definitions of all
 288    elements.  */
 289 extern const struct exp_descriptor exp_descriptor_standard;
 290
 291 /* Functions used by language-specific extended operators to (recursively)
 292    print/dump subexpressions.  */
 293
 294 extern void print_subexp (struct expression *, int *, struct ui_file *,
 295                           enum precedence);
 296
 297 extern void print_subexp_standard (struct expression *, int *,
 298                                    struct ui_file *, enum precedence);
 299
 300 /* Function used to avoid direct calls to fprintf
 301    in the code generated by the bison parser.  */
 302
 303 extern void parser_fprintf (FILE *, const char *, ...) ATTR_FORMAT (printf, 2 ,3);
 304
 305 #endif /* PARSER_DEFS_H */