1 /* Definitions for expressions stored in reversed prefix form, for GDB.
3 Copyright (C) 1986, 1989, 1992, 1994, 2000, 2003, 2005, 2007-2012
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #if !defined (EXPRESSION_H)
22 #define EXPRESSION_H 1
25 #include "symtab.h" /* Needed for "struct block" type. */
26 #include "doublest.h" /* Needed for DOUBLEST. */
29 /* Definitions for saved C expressions. */
31 /* An expression is represented as a vector of union exp_element's.
32 Each exp_element is an opcode, except that some opcodes cause
33 the following exp_element to be treated as a long or double constant
34 or as a variable. The opcodes are obeyed, using a stack for temporaries.
35 The value is left on the temporary stack at the end. */
37 /* When it is necessary to include a string,
38 it can occupy as many exp_elements as it needs.
39 We find the length of the string using strlen,
40 divide to find out how many exp_elements are used up,
41 and skip that many. Strings, like numbers, are indicated
42 by the preceding opcode. */
46 #define OP(name) name ,
48 #include "std-operator.def"
50 /* First extension operator. Individual language modules define extra
51 operators in *.def include files below with numbers higher than
55 /* Language specific operators. */
56 #include "ada-operator.def"
60 /* Existing only to swallow the last comma (',') from last .inc file. */
66 enum exp_opcode opcode
;
67 struct symbol
*symbol
;
70 gdb_byte decfloatconst
[16];
71 /* Really sizeof (union exp_element) characters (or less for the last
72 element of a string). */
75 struct internalvar
*internalvar
;
77 struct objfile
*objfile
;
82 const struct language_defn
*language_defn
; /* language it was
84 struct gdbarch
*gdbarch
; /* architecture it was parsed in. */
86 union exp_element elts
[1];
89 /* Macros for converting between number of expression elements and bytes
90 to store that many expression elements. */
92 #define EXP_ELEM_TO_BYTES(elements) \
93 ((elements) * sizeof (union exp_element))
94 #define BYTES_TO_EXP_ELEM(bytes) \
95 (((bytes) + sizeof (union exp_element) - 1) / sizeof (union exp_element))
99 extern struct expression
*parse_expression (char *);
101 extern struct type
*parse_field_expression (char *, char **);
103 extern struct expression
*parse_exp_1 (char **, struct block
*, int);
105 /* For use by parsers; set if we want to parse an expression and
106 attempt to complete a field name. */
107 extern int in_parse_field
;
109 /* The innermost context required by the stack and register variables
110 we've encountered so far. To use this, set it to NULL, then call
111 parse_<whatever>, then look at it. */
112 extern struct block
*innermost_block
;
116 /* Values of NOSIDE argument to eval_subexp. */
121 EVAL_SKIP
, /* Only effect is to increment pos. */
122 EVAL_AVOID_SIDE_EFFECTS
/* Don't modify any variables or
123 call any functions. The value
124 returned will have the correct
125 type, and will have an
126 approximately correct lvalue
127 type (inaccuracy: anything that is
128 listed as being in a register in
129 the function in which it was
130 declared will be lval_register). */
133 extern struct value
*evaluate_subexp_standard
134 (struct type
*, struct expression
*, int *, enum noside
);
136 /* From expprint.c */
138 extern void print_expression (struct expression
*, struct ui_file
*);
140 extern char *op_string (enum exp_opcode
);
142 extern void dump_raw_expression (struct expression
*,
143 struct ui_file
*, char *);
144 extern void dump_prefix_expression (struct expression
*, struct ui_file
*);
146 #endif /* !defined (EXPRESSION_H) */
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