1 /* Parser definitions for GDB.
3 Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
4 1998, 1999, 2000, 2002, 2007, 2008, 2009, 2010, 2011
5 Free Software Foundation, Inc.
7 Modified from expread.y by the Department of Computer Science at the
8 State University of New York at Buffalo.
10 This file is part of GDB.
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.
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.
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/>. */
25 #if !defined (PARSER_DEFS_H)
26 #define PARSER_DEFS_H 1
32 extern int parser_debug;
34 extern struct expression *expout;
35 extern int expout_size;
36 extern int expout_ptr;
38 #define parse_gdbarch (expout->gdbarch)
39 #define parse_language (expout->language_defn)
41 /* If this is nonzero, this block is used as the lexical context
44 extern struct block *expression_context_block;
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;
52 /* The innermost context required by the stack and register variables
53 we've encountered so far. */
54 extern struct block *innermost_block;
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;
61 /* Number of arguments seen so far in innermost function call. */
62 extern int arglist_len;
64 /* A string token, either a char-string or bit-string. Char-strings are
65 used, for example, for the names of symbols. */
69 /* Pointer to first byte of char-string or first bit of bit-string */
71 /* Length of string in bytes for char-string or bits for bit-string */
77 /* A language-specific type field. */
79 /* Pointer to first byte of char-string or first bit of bit-string */
81 /* Length of string in bytes for char-string or bits for bit-string */
88 struct typed_stoken *tokens;
101 int is_a_field_of_this;
104 struct objc_class_str
106 struct stoken stoken;
112 /* For parsing of complicated types.
113 An array should be preceded in the list by the size of the array. */
125 /* The stack can contain either an enum type_pieces or an int. */
128 enum type_pieces piece;
131 extern union type_stack_elt *type_stack;
132 extern int type_stack_depth, type_stack_size;
134 extern void write_exp_elt (union exp_element);
136 extern void write_exp_elt_opcode (enum exp_opcode);
138 extern void write_exp_elt_sym (struct symbol *);
140 extern void write_exp_elt_longcst (LONGEST);
142 extern void write_exp_elt_dblcst (DOUBLEST);
144 extern void write_exp_elt_decfloatcst (gdb_byte *);
146 extern void write_exp_elt_type (struct type *);
148 extern void write_exp_elt_intern (struct internalvar *);
150 extern void write_exp_string (struct stoken);
152 void write_exp_string_vector (int type, struct stoken_vector *vec);
154 extern void write_exp_bitstring (struct stoken);
156 extern void write_exp_elt_block (struct block *);
158 extern void write_exp_elt_objfile (struct objfile *objfile);
160 extern void write_exp_msymbol (struct minimal_symbol *);
162 extern void write_dollar_variable (struct stoken str);
164 extern void mark_struct_expression (void);
166 extern char *find_template_name_end (char *);
168 extern void start_arglist (void);
170 extern int end_arglist (void);
172 extern char *copy_name (struct stoken);
174 extern void push_type (enum type_pieces);
176 extern void push_type_int (int);
178 extern void push_type_address_space (char *);
180 extern enum type_pieces pop_type (void);
182 extern int pop_type_int (void);
184 extern int length_of_subexp (struct expression *, int);
186 extern int dump_subexp (struct expression *, struct ui_file *, int);
188 extern int dump_subexp_body_standard (struct expression *,
189 struct ui_file *, int);
191 extern void operator_length (const struct expression *, int, int *, int *);
193 extern void operator_length_standard (const struct expression *, int, int *,
196 extern int operator_check_standard (struct expression *exp, int pos,
198 (struct objfile *objfile, void *data),
201 extern char *op_name_standard (enum exp_opcode);
203 extern struct type *follow_types (struct type *);
205 extern void null_post_parser (struct expression **, int);
207 extern int parse_float (const char *p, int len, DOUBLEST *d,
208 const char **suffix);
210 extern int parse_c_float (struct gdbarch *gdbarch, const char *p, int len,
211 DOUBLEST *d, struct type **t);
213 /* During parsing of a C expression, the pointer to the next character
214 is in this variable. */
218 /* After a token has been recognized, this variable points to it.
219 Currently used only for error reporting. */
220 extern char *prev_lexptr;
222 /* Tokens that refer to names do so with explicit pointer and length,
223 so they can share the storage that lexptr is parsing.
225 When it is necessary to pass a name to a function that expects
226 a null-terminated string, the substring is copied out
227 into a block of storage that namecopy points to.
229 namecopy is allocated once, guaranteed big enough, for each parsing. */
231 extern char *namecopy;
233 /* Current depth in parentheses within the expression. */
235 extern int paren_depth;
237 /* Nonzero means stop parsing on first comma (if not within parentheses). */
239 extern int comma_terminates;
241 /* These codes indicate operator precedences for expression printing,
242 least tightly binding first. */
243 /* Adding 1 to a precedence value is done for binary operators,
244 on the operand which is more tightly bound, so that operators
245 of equal precedence within that operand will get parentheses. */
246 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
247 they are used as the "surrounding precedence" to force
248 various kinds of things to be parenthesized. */
251 PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
252 PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
253 PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
254 PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
257 /* Table mapping opcodes into strings for printing operators
258 and precedences of the operators. */
263 enum exp_opcode opcode;
264 /* Precedence of operator. These values are used only by comparisons. */
265 enum precedence precedence;
267 /* For a binary operator: 1 iff right associate.
268 For a unary operator: 1 iff postfix. */
272 /* Information needed to print, prefixify, and evaluate expressions for
275 struct exp_descriptor
277 /* Print subexpression. */
278 void (*print_subexp) (struct expression *, int *, struct ui_file *,
281 /* Returns number of exp_elements needed to represent an operator and
282 the number of subexpressions it takes. */
283 void (*operator_length) (const struct expression*, int, int*, int *);
285 /* Call TYPE_FUNC and OBJFILE_FUNC for any TYPE and OBJFILE found being
286 referenced by the single operator of EXP at position POS. Operator
287 parameters are located at positive (POS + number) offsets in EXP.
288 The functions should never be called with NULL TYPE or NULL OBJFILE.
289 Functions should get passed an arbitrary caller supplied DATA pointer.
290 If any of the functions returns non-zero value then (any other) non-zero
291 value should be immediately returned to the caller. Otherwise zero
292 should be returned. */
293 int (*operator_check) (struct expression *exp, int pos,
294 int (*objfile_func) (struct objfile *objfile,
298 /* Name of this operator for dumping purposes. */
299 char *(*op_name) (enum exp_opcode);
301 /* Dump the rest of this (prefix) expression after the operator
302 itself has been printed. See dump_subexp_body_standard in
304 int (*dump_subexp_body) (struct expression *, struct ui_file *, int);
306 /* Evaluate an expression. */
307 struct value *(*evaluate_exp) (struct type *, struct expression *,
312 /* Default descriptor containing standard definitions of all
314 extern const struct exp_descriptor exp_descriptor_standard;
316 /* Functions used by language-specific extended operators to (recursively)
317 print/dump subexpressions. */
319 extern void print_subexp (struct expression *, int *, struct ui_file *,
322 extern void print_subexp_standard (struct expression *, int *,
323 struct ui_file *, enum precedence);
325 /* Function used to avoid direct calls to fprintf
326 in the code generated by the bison parser. */
328 extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3);
330 extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);
332 #endif /* PARSER_DEFS_H */