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 Free Software Foundation, Inc.
6 Modified from expread.y by the Department of Computer Science at the
7 State University of New York at Buffalo.
9 This file is part of GDB.
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 3 of the License, or
14 (at your option) any later version.
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.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #if !defined (PARSER_DEFS_H)
25 #define PARSER_DEFS_H 1
31 extern struct expression *expout;
32 extern int expout_size;
33 extern int expout_ptr;
35 /* If this is nonzero, this block is used as the lexical context
38 extern struct block *expression_context_block;
40 /* If expression_context_block is non-zero, then this is the PC within
41 the block that we want to evaluate expressions at. When debugging
42 C or C++ code, we use this to find the exact line we're at, and
43 then look up the macro definitions active at that point. */
44 extern CORE_ADDR expression_context_pc;
46 /* The innermost context required by the stack and register variables
47 we've encountered so far. */
48 extern struct block *innermost_block;
50 /* The block in which the most recently discovered symbol was found.
51 FIXME: Should be declared along with lookup_symbol in symtab.h; is not
52 related specifically to parsing. */
53 extern struct block *block_found;
55 /* Number of arguments seen so far in innermost function call. */
56 extern int arglist_len;
58 /* A string token, either a char-string or bit-string. Char-strings are
59 used, for example, for the names of symbols. */
63 /* Pointer to first byte of char-string or first bit of bit-string */
65 /* Length of string in bytes for char-string or bits for bit-string */
79 int is_a_field_of_this;
90 /* For parsing of complicated types.
91 An array should be preceded in the list by the size of the array. */
103 /* The stack can contain either an enum type_pieces or an int. */
106 enum type_pieces piece;
109 extern union type_stack_elt *type_stack;
110 extern int type_stack_depth, type_stack_size;
112 extern void write_exp_elt (union exp_element);
114 extern void write_exp_elt_opcode (enum exp_opcode);
116 extern void write_exp_elt_sym (struct symbol *);
118 extern void write_exp_elt_longcst (LONGEST);
120 extern void write_exp_elt_dblcst (DOUBLEST);
122 extern void write_exp_elt_decfloatcst (gdb_byte *);
124 extern void write_exp_elt_type (struct type *);
126 extern void write_exp_elt_intern (struct internalvar *);
128 extern void write_exp_string (struct stoken);
130 extern void write_exp_bitstring (struct stoken);
132 extern void write_exp_elt_block (struct block *);
134 extern void write_exp_elt_objfile (struct objfile *objfile);
136 extern void write_exp_msymbol (struct minimal_symbol *,
137 struct type *, struct type *);
139 extern void write_dollar_variable (struct stoken str);
141 extern void mark_struct_expression (void);
143 extern char *find_template_name_end (char *);
145 extern void start_arglist (void);
147 extern int end_arglist (void);
149 extern char *copy_name (struct stoken);
151 extern void push_type (enum type_pieces);
153 extern void push_type_int (int);
155 extern void push_type_address_space (char *);
157 extern enum type_pieces pop_type (void);
159 extern int pop_type_int (void);
161 extern int length_of_subexp (struct expression *, int);
163 extern int dump_subexp (struct expression *, struct ui_file *, int);
165 extern int dump_subexp_body_standard (struct expression *,
166 struct ui_file *, int);
168 extern void operator_length (struct expression *, int, int *, int *);
170 extern void operator_length_standard (struct expression *, int, int *, int *);
172 extern char *op_name_standard (enum exp_opcode);
174 extern struct type *follow_types (struct type *);
176 extern void null_post_parser (struct expression **, int);
178 /* During parsing of a C expression, the pointer to the next character
179 is in this variable. */
183 /* After a token has been recognized, this variable points to it.
184 Currently used only for error reporting. */
185 extern char *prev_lexptr;
187 /* Tokens that refer to names do so with explicit pointer and length,
188 so they can share the storage that lexptr is parsing.
190 When it is necessary to pass a name to a function that expects
191 a null-terminated string, the substring is copied out
192 into a block of storage that namecopy points to.
194 namecopy is allocated once, guaranteed big enough, for each parsing. */
196 extern char *namecopy;
198 /* Current depth in parentheses within the expression. */
200 extern int paren_depth;
202 /* Nonzero means stop parsing on first comma (if not within parentheses). */
204 extern int comma_terminates;
206 /* These codes indicate operator precedences for expression printing,
207 least tightly binding first. */
208 /* Adding 1 to a precedence value is done for binary operators,
209 on the operand which is more tightly bound, so that operators
210 of equal precedence within that operand will get parentheses. */
211 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
212 they are used as the "surrounding precedence" to force
213 various kinds of things to be parenthesized. */
216 PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
217 PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
218 PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
219 PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
222 /* Table mapping opcodes into strings for printing operators
223 and precedences of the operators. */
228 enum exp_opcode opcode;
229 /* Precedence of operator. These values are used only by comparisons. */
230 enum precedence precedence;
232 /* For a binary operator: 1 iff right associate.
233 For a unary operator: 1 iff postfix. */
237 /* Information needed to print, prefixify, and evaluate expressions for
240 struct exp_descriptor
242 /* Print subexpression. */
243 void (*print_subexp) (struct expression *, int *, struct ui_file *,
246 /* Returns number of exp_elements needed to represent an operator and
247 the number of subexpressions it takes. */
248 void (*operator_length) (struct expression*, int, int*, int *);
250 /* Name of this operator for dumping purposes. */
251 char *(*op_name) (enum exp_opcode);
253 /* Dump the rest of this (prefix) expression after the operator
254 itself has been printed. See dump_subexp_body_standard in
256 int (*dump_subexp_body) (struct expression *, struct ui_file *, int);
258 /* Evaluate an expression. */
259 struct value *(*evaluate_exp) (struct type *, struct expression *,
264 /* Default descriptor containing standard definitions of all
266 extern const struct exp_descriptor exp_descriptor_standard;
268 /* Functions used by language-specific extended operators to (recursively)
269 print/dump subexpressions. */
271 extern void print_subexp (struct expression *, int *, struct ui_file *,
274 extern void print_subexp_standard (struct expression *, int *,
275 struct ui_file *, enum precedence);
277 /* Function used to avoid direct calls to fprintf
278 in the code generated by the bison parser. */
280 extern void parser_fprintf (FILE *, const char *, ...) ATTR_FORMAT (printf, 2 ,3);
282 #endif /* PARSER_DEFS_H */