1 /* Definitions for expressions stored in reversed prefix form, for GDB.
3 Copyright (C) 1986-2018 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. */
27 /* Definitions for saved C expressions. */
29 /* An expression is represented as a vector of union exp_element's.
30 Each exp_element is an opcode, except that some opcodes cause
31 the following exp_element to be treated as a long or double constant
32 or as a variable. The opcodes are obeyed, using a stack for temporaries.
33 The value is left on the temporary stack at the end. */
35 /* When it is necessary to include a string,
36 it can occupy as many exp_elements as it needs.
37 We find the length of the string using strlen,
38 divide to find out how many exp_elements are used up,
39 and skip that many. Strings, like numbers, are indicated
40 by the preceding opcode. */
44 #define OP(name) name ,
46 #include "std-operator.def"
48 /* First extension operator. Individual language modules define extra
49 operators in *.def include files below with numbers higher than
53 /* Language specific operators. */
54 #include "ada-operator.def"
58 /* Existing only to swallow the last comma (',') from last .inc file. */
64 enum exp_opcode opcode
;
65 struct symbol
*symbol
;
66 struct minimal_symbol
*msymbol
;
68 gdb_byte floatconst
[16];
69 /* Really sizeof (union exp_element) characters (or less for the last
70 element of a string). */
73 struct internalvar
*internalvar
;
74 const struct block
*block
;
75 struct objfile
*objfile
;
80 const struct language_defn
*language_defn
; /* language it was
82 struct gdbarch
*gdbarch
; /* architecture it was parsed in. */
84 union exp_element elts
[1];
87 typedef gdb::unique_xmalloc_ptr
<expression
> expression_up
;
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 expression_up
parse_expression (const char *);
101 extern expression_up
parse_expression_with_language (const char *string
,
104 extern struct type
*parse_expression_for_completion (const char *, char **,
107 extern expression_up
parse_exp_1 (const char **, CORE_ADDR pc
,
108 const struct block
*, int);
110 /* For use by parsers; set if we want to parse an expression and
111 attempt completion. */
112 extern int parse_completion
;
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).
131 Ideally this would not even read
132 target memory, but currently it
133 does in many situations. */
136 extern struct value
*evaluate_subexp_standard
137 (struct type
*, struct expression
*, int *, enum noside
);
139 /* From expprint.c */
141 extern void print_expression (struct expression
*, struct ui_file
*);
143 extern const char *op_name (struct expression
*exp
, enum exp_opcode opcode
);
145 extern const char *op_string (enum exp_opcode
);
147 extern void dump_raw_expression (struct expression
*,
148 struct ui_file
*, const char *);
149 extern void dump_prefix_expression (struct expression
*, struct ui_file
*);
151 /* In an OP_RANGE expression, either bound could be empty, indicating
152 that its value is by default that of the corresponding bound of the
153 array or string. So we have four sorts of subrange. This
154 enumeration type is to identify this. */
158 BOTH_BOUND_DEFAULT
, /* "(:)" */
159 LOW_BOUND_DEFAULT
, /* "(:high)" */
160 HIGH_BOUND_DEFAULT
, /* "(low:)" */
161 NONE_BOUND_DEFAULT
/* "(low:high)" */
164 #endif /* !defined (EXPRESSION_H) */
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