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_opcode (enum exp_opcode);
136 extern void write_exp_elt_sym (struct symbol *);
138 extern void write_exp_elt_longcst (LONGEST);
140 extern void write_exp_elt_dblcst (DOUBLEST);
142 extern void write_exp_elt_decfloatcst (gdb_byte *);
144 extern void write_exp_elt_type (struct type *);
146 extern void write_exp_elt_intern (struct internalvar *);
148 extern void write_exp_string (struct stoken);
150 void write_exp_string_vector (int type, struct stoken_vector *vec);
152 extern void write_exp_bitstring (struct stoken);
154 extern void write_exp_elt_block (struct block *);
156 extern void write_exp_elt_objfile (struct objfile *objfile);
158 extern void write_exp_msymbol (struct minimal_symbol *);
160 extern void write_dollar_variable (struct stoken str);
162 extern void mark_struct_expression (void);
164 extern char *find_template_name_end (char *);
166 extern void start_arglist (void);
168 extern int end_arglist (void);
170 extern char *copy_name (struct stoken);
172 extern void push_type (enum type_pieces);
174 extern void push_type_int (int);
176 extern void push_type_address_space (char *);
178 extern enum type_pieces pop_type (void);
180 extern int pop_type_int (void);
182 extern int length_of_subexp (struct expression *, int);
184 extern int dump_subexp (struct expression *, struct ui_file *, int);
186 extern int dump_subexp_body_standard (struct expression *,
187 struct ui_file *, int);
189 extern void operator_length (const struct expression *, int, int *, int *);
191 extern void operator_length_standard (const struct expression *, int, int *,
194 extern int operator_check_standard (struct expression *exp, int pos,
196 (struct objfile *objfile, void *data),
199 extern char *op_name_standard (enum exp_opcode);
201 extern struct type *follow_types (struct type *);
203 extern void null_post_parser (struct expression **, int);
205 extern int parse_float (const char *p, int len, DOUBLEST *d,
206 const char **suffix);
208 extern int parse_c_float (struct gdbarch *gdbarch, const char *p, int len,
209 DOUBLEST *d, struct type **t);
211 /* During parsing of a C expression, the pointer to the next character
212 is in this variable. */
216 /* After a token has been recognized, this variable points to it.
217 Currently used only for error reporting. */
218 extern char *prev_lexptr;
220 /* Tokens that refer to names do so with explicit pointer and length,
221 so they can share the storage that lexptr is parsing.
223 When it is necessary to pass a name to a function that expects
224 a null-terminated string, the substring is copied out
225 into a block of storage that namecopy points to.
227 namecopy is allocated once, guaranteed big enough, for each parsing. */
229 extern char *namecopy;
231 /* Current depth in parentheses within the expression. */
233 extern int paren_depth;
235 /* Nonzero means stop parsing on first comma (if not within parentheses). */
237 extern int comma_terminates;
239 /* These codes indicate operator precedences for expression printing,
240 least tightly binding first. */
241 /* Adding 1 to a precedence value is done for binary operators,
242 on the operand which is more tightly bound, so that operators
243 of equal precedence within that operand will get parentheses. */
244 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
245 they are used as the "surrounding precedence" to force
246 various kinds of things to be parenthesized. */
249 PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
250 PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
251 PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
252 PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
255 /* Table mapping opcodes into strings for printing operators
256 and precedences of the operators. */
261 enum exp_opcode opcode;
262 /* Precedence of operator. These values are used only by comparisons. */
263 enum precedence precedence;
265 /* For a binary operator: 1 iff right associate.
266 For a unary operator: 1 iff postfix. */
270 /* Information needed to print, prefixify, and evaluate expressions for
273 struct exp_descriptor
275 /* Print subexpression. */
276 void (*print_subexp) (struct expression *, int *, struct ui_file *,
279 /* Returns number of exp_elements needed to represent an operator and
280 the number of subexpressions it takes. */
281 void (*operator_length) (const struct expression*, int, int*, int *);
283 /* Call TYPE_FUNC and OBJFILE_FUNC for any TYPE and OBJFILE found being
284 referenced by the single operator of EXP at position POS. Operator
285 parameters are located at positive (POS + number) offsets in EXP.
286 The functions should never be called with NULL TYPE or NULL OBJFILE.
287 Functions should get passed an arbitrary caller supplied DATA pointer.
288 If any of the functions returns non-zero value then (any other) non-zero
289 value should be immediately returned to the caller. Otherwise zero
290 should be returned. */
291 int (*operator_check) (struct expression *exp, int pos,
292 int (*objfile_func) (struct objfile *objfile,
296 /* Name of this operator for dumping purposes. */
297 char *(*op_name) (enum exp_opcode);
299 /* Dump the rest of this (prefix) expression after the operator
300 itself has been printed. See dump_subexp_body_standard in
302 int (*dump_subexp_body) (struct expression *, struct ui_file *, int);
304 /* Evaluate an expression. */
305 struct value *(*evaluate_exp) (struct type *, struct expression *,
310 /* Default descriptor containing standard definitions of all
312 extern const struct exp_descriptor exp_descriptor_standard;
314 /* Functions used by language-specific extended operators to (recursively)
315 print/dump subexpressions. */
317 extern void print_subexp (struct expression *, int *, struct ui_file *,
320 extern void print_subexp_standard (struct expression *, int *,
321 struct ui_file *, enum precedence);
323 /* Function used to avoid direct calls to fprintf
324 in the code generated by the bison parser. */
326 extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3);
328 extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);
330 #endif /* PARSER_DEFS_H */