1 /* Definitions for expressions stored in reversed prefix form, for GDB.
3 Copyright (C) 1986-2017 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #if !defined (EXPRESSION_H)
21 #define EXPRESSION_H 1
24 #include "symtab.h" /* Needed for "struct block" type. */
25 #include "doublest.h" /* Needed for DOUBLEST. */
28 /* Definitions for saved C expressions. */
30 /* An expression is represented as a vector of union exp_element's.
31 Each exp_element is an opcode, except that some opcodes cause
32 the following exp_element to be treated as a long or double constant
33 or as a variable. The opcodes are obeyed, using a stack for temporaries.
34 The value is left on the temporary stack at the end. */
36 /* When it is necessary to include a string,
37 it can occupy as many exp_elements as it needs.
38 We find the length of the string using strlen,
39 divide to find out how many exp_elements are used up,
40 and skip that many. Strings, like numbers, are indicated
41 by the preceding opcode. */
45 #define OP(name) name ,
47 #include "std-operator.def"
49 /* First extension operator. Individual language modules define extra
50 operators in *.def include files below with numbers higher than
54 /* Language specific operators. */
55 #include "ada-operator.def"
59 /* Existing only to swallow the last comma (',') from last .inc file. */
65 enum exp_opcode opcode
;
66 struct symbol
*symbol
;
67 struct minimal_symbol
*msymbol
;
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
;
76 const struct block
*block
;
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 typedef gdb::unique_xmalloc_ptr
<expression
> expression_up
;
91 /* Macros for converting between number of expression elements and bytes
92 to store that many expression elements. */
94 #define EXP_ELEM_TO_BYTES(elements) \
95 ((elements) * sizeof (union exp_element))
96 #define BYTES_TO_EXP_ELEM(bytes) \
97 (((bytes) + sizeof (union exp_element) - 1) / sizeof (union exp_element))
101 extern expression_up
parse_expression (const char *);
103 extern expression_up
parse_expression_with_language (const char *string
,
106 extern struct type
*parse_expression_for_completion (const char *, char **,
109 extern expression_up
parse_exp_1 (const char **, CORE_ADDR pc
,
110 const struct block
*, int);
112 /* For use by parsers; set if we want to parse an expression and
113 attempt completion. */
114 extern int parse_completion
;
116 /* The innermost context required by the stack and register variables
117 we've encountered so far. To use this, set it to NULL, then call
118 parse_<whatever>, then look at it. */
119 extern const struct block
*innermost_block
;
123 /* Values of NOSIDE argument to eval_subexp. */
128 EVAL_SKIP
, /* Only effect is to increment pos. */
129 EVAL_AVOID_SIDE_EFFECTS
/* Don't modify any variables or
130 call any functions. The value
131 returned will have the correct
132 type, and will have an
133 approximately correct lvalue
134 type (inaccuracy: anything that is
135 listed as being in a register in
136 the function in which it was
137 declared will be lval_register).
138 Ideally this would not even read
139 target memory, but currently it
140 does in many situations. */
143 extern struct value
*evaluate_subexp_standard
144 (struct type
*, struct expression
*, int *, enum noside
);
146 /* From expprint.c */
148 extern void print_expression (struct expression
*, struct ui_file
*);
150 extern const char *op_name (struct expression
*exp
, enum exp_opcode opcode
);
152 extern const char *op_string (enum exp_opcode
);
154 extern void dump_raw_expression (struct expression
*,
155 struct ui_file
*, const char *);
156 extern void dump_prefix_expression (struct expression
*, struct ui_file
*);
158 /* In an OP_RANGE expression, either bound could be empty, indicating
159 that its value is by default that of the corresponding bound of the
160 array or string. So we have four sorts of subrange. This
161 enumeration type is to identify this. */
165 BOTH_BOUND_DEFAULT
, /* "(:)" */
166 LOW_BOUND_DEFAULT
, /* "(:high)" */
167 HIGH_BOUND_DEFAULT
, /* "(low:)" */
168 NONE_BOUND_DEFAULT
/* "(low:high)" */
171 #endif /* !defined (EXPRESSION_H) */
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