1 /* Standard language operator definitions for GDB, the GNU debugger.
3 Copyright (C) 1986-2014 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 /* Used when it's necessary to pass an opcode which will be ignored,
21 or to catch uninitialized values. */
24 /* BINOP_... operate on two values computed by following subexpressions,
25 replacing them by one result value. They take no immediate arguments. */
27 OP (BINOP_ADD) /* + */
28 OP (BINOP_SUB) /* - */
29 OP (BINOP_MUL) /* * */
30 OP (BINOP_DIV) /* / */
31 OP (BINOP_REM) /* % */
32 OP (BINOP_MOD) /* mod (Knuth 1.2.4) */
33 OP (BINOP_LSH) /* << */
34 OP (BINOP_RSH) /* >> */
35 OP (BINOP_LOGICAL_AND) /* && */
36 OP (BINOP_LOGICAL_OR) /* || */
37 OP (BINOP_BITWISE_AND) /* & */
38 OP (BINOP_BITWISE_IOR) /* | */
39 OP (BINOP_BITWISE_XOR) /* ^ */
40 OP (BINOP_EQUAL) /* == */
41 OP (BINOP_NOTEQUAL) /* != */
42 OP (BINOP_LESS) /* < */
43 OP (BINOP_GTR) /* > */
44 OP (BINOP_LEQ) /* <= */
45 OP (BINOP_GEQ) /* >= */
46 OP (BINOP_REPEAT) /* @ */
47 OP (BINOP_ASSIGN) /* = */
48 OP (BINOP_COMMA) /* , */
49 OP (BINOP_SUBSCRIPT) /* x[y] */
50 OP (BINOP_EXP) /* Exponentiation */
54 OP (BINOP_MIN) /* <? */
55 OP (BINOP_MAX) /* >? */
57 /* STRUCTOP_MEMBER is used for pointer-to-member constructs.
58 X . * Y translates into X STRUCTOP_MEMBER Y. */
61 /* STRUCTOP_MPTR is used for pointer-to-member constructs
62 when X is a pointer instead of an aggregate. */
65 /* TYPE_INSTANCE is used when the user specifies a specific
66 type instantiation for overloaded methods/functions.
69 TYPE_INSTANCE num_types type0 ... typeN num_types TYPE_INSTANCE. */
74 /* For Modula-2 integer division DIV. */
77 /* +=, -=, *=, and so on. The following exp_element is another opcode,
78 a BINOP_, saying how to modify. Then comes another BINOP_ASSIGN_MODIFY,
79 making three exp_elements in total. */
80 OP (BINOP_ASSIGN_MODIFY)
82 /* Modula-2 standard (binary) procedures. */
85 /* Concatenate two operands, such as character strings or bitstrings.
86 If the first operand is a integer expression, then it means concatenate
87 the second operand with itself that many times. */
90 /* This is the "colon operator" used various places in (the
94 /* This must be the highest BINOP_ value, for expprint.c. */
97 /* Operates on three values computed by following subexpressions. */
98 OP (TERNOP_COND) /* ?: */
100 /* A sub-string/sub-array. (the deleted) Chill syntax:
101 OP1(OP2:OP3). Return elements OP2 through OP3 of OP1. */
104 /* Multidimensional subscript operator, such as Modula-2 x[a,b,...].
105 The dimensionality is encoded in the operator, like the number of
106 function arguments in OP_FUNCALL, I.E. <OP><dimension><OP>.
107 The value of the first following subexpression is subscripted
108 by each of the next following subexpressions, one per dimension. */
111 /* The OP_... series take immediate following arguments.
112 After the arguments come another OP_... (the same one)
113 so that the grouping can be recognized from the end. */
115 /* OP_LONG is followed by a type pointer in the next exp_element
116 and the long constant value in the following exp_element.
117 Then comes another OP_LONG.
118 Thus, the operation occupies four exp_elements. */
121 /* OP_DOUBLE is similar but takes a DOUBLEST constant instead of a
125 /* OP_VAR_VALUE takes one struct block * in the following element,
126 and one struct symbol * in the following exp_element, followed
127 by another OP_VAR_VALUE, making four exp_elements. If the
128 block is non-NULL, evaluate the symbol relative to the
129 innermost frame executing in that block; if the block is NULL
130 use the selected frame. */
133 /* OP_VAR_ENTRY_VALUE takes one struct symbol * in the following element,
134 followed by another OP_VAR_ENTRY_VALUE, making three exp_elements.
135 somename@entry may mean parameter value as present at the entry of the
136 current function. Implemented via DW_OP_GNU_entry_value. */
137 OP (OP_VAR_ENTRY_VALUE)
139 /* OP_LAST is followed by an integer in the next exp_element.
140 The integer is zero for the last value printed,
141 or it is the absolute number of a history element.
142 With another OP_LAST at the end, this makes three exp_elements. */
145 /* OP_REGISTER is followed by a string in the next exp_element.
146 This is the name of a register to fetch. */
149 /* OP_INTERNALVAR is followed by an internalvar ptr in the next
150 exp_element. With another OP_INTERNALVAR at the end, this
151 makes three exp_elements. */
154 /* OP_FUNCALL is followed by an integer in the next exp_element.
155 The integer is the number of args to the function call.
156 That many plus one values from following subexpressions
157 are used, the first one being the function.
158 The integer is followed by a repeat of OP_FUNCALL,
159 making three exp_elements. */
162 /* OP_OBJC_MSGCALL is followed by a string in the next exp_element
163 and then an integer. The string is the selector string. The
164 integer is the number of arguments to the message call. That
165 many plus one values are used, the first one being the object
166 pointer. This is an Objective C message. */
169 /* This is EXACTLY like OP_FUNCALL but is semantically different.
170 In F77, array subscript expressions, substring expressions and
171 function calls are all exactly the same syntactically. They
172 may only be disambiguated at runtime. Thus this operator,
173 which indicates that we have found something of the form
174 <name> ( <stuff> ). */
175 OP (OP_F77_UNDETERMINED_ARGLIST)
177 /* OP_COMPLEX takes a type in the following element, followed by another
178 OP_COMPLEX, making three exp_elements. It is followed by two double
179 args, and converts them into a complex number of the given type. */
182 /* OP_STRING represents a string constant.
183 Its format is the same as that of a STRUCTOP, but the string
184 data is just made into a string constant when the operation
188 /* OP_ARRAY creates an array constant out of the following subexpressions.
189 It is followed by two exp_elements, the first containing an integer
190 that is the lower bound of the array and the second containing another
191 integer that is the upper bound of the array. The second integer is
192 followed by a repeat of OP_ARRAY, making four exp_elements total.
193 The bounds are used to compute the number of following subexpressions
194 to consume, as well as setting the bounds in the created array constant.
195 The type of the elements is taken from the type of the first subexp,
196 and they must all match. */
199 /* UNOP_CAST is followed by a type pointer in the next exp_element.
200 With another UNOP_CAST at the end, this makes three exp_elements.
201 It casts the value of the following subexpression. */
204 /* Like UNOP_CAST, but the type is a subexpression. */
207 /* The C++ dynamic_cast operator. */
208 OP (UNOP_DYNAMIC_CAST)
210 /* The C++ reinterpret_cast operator. */
211 OP (UNOP_REINTERPRET_CAST)
213 /* UNOP_MEMVAL is followed by a type pointer in the next exp_element
214 With another UNOP_MEMVAL at the end, this makes three exp_elements.
215 It casts the contents of the word addressed by the value of the
216 following subexpression. */
219 /* UNOP_MEMVAL_TLS is followed by a `struct objfile' pointer in the next
220 exp_element and a type pointer in the following exp_element.
221 With another UNOP_MEMVAL_TLS at the end, this makes four exp_elements.
222 It casts the contents of the word offsetted by the value of the
223 following subexpression from the TLS specified by `struct objfile'. */
226 /* Like UNOP_MEMVAL, but the type is supplied as a subexpression. */
227 OP (UNOP_MEMVAL_TYPE)
229 /* UNOP_... operate on one value from a following subexpression
230 and replace it with a result. They take no immediate arguments. */
232 OP (UNOP_NEG) /* Unary - */
233 OP (UNOP_LOGICAL_NOT) /* Unary ! */
234 OP (UNOP_COMPLEMENT) /* Unary ~ */
235 OP (UNOP_IND) /* Unary * */
236 OP (UNOP_ADDR) /* Unary & */
237 OP (UNOP_PREINCREMENT) /* ++ before an expression */
238 OP (UNOP_POSTINCREMENT) /* ++ after an expression */
239 OP (UNOP_PREDECREMENT) /* -- before an expression */
240 OP (UNOP_POSTDECREMENT) /* -- after an expression */
241 OP (UNOP_SIZEOF) /* Unary sizeof (followed by expression) */
243 OP (UNOP_PLUS) /* Unary plus */
245 OP (UNOP_CAP) /* Modula-2 standard (unary) procedures */
256 OP (OP_BOOL) /* Modula-2 builtin BOOLEAN type */
257 OP (OP_M2_STRING) /* Modula-2 string constants */
259 /* STRUCTOP_... operate on a value from a following subexpression
260 by extracting a structure component specified by a string
261 that appears in the following exp_elements (as many as needed).
262 STRUCTOP_STRUCT is used for "." and STRUCTOP_PTR for "->".
263 They differ only in the error message given in case the value is
264 not suitable or the structure component specified is not found.
266 The length of the string follows the opcode, followed by
267 BYTES_TO_EXP_ELEM(length) elements containing the data of the
268 string, followed by the length again and the opcode again. */
273 /* C++: OP_THIS is just a placeholder for the class instance variable.
274 It just comes in a tight (OP_THIS, OP_THIS) pair. */
277 /* Objective C: "@selector" pseudo-operator. */
278 OP (OP_OBJC_SELECTOR)
280 /* OP_SCOPE surrounds a type name and a field name. The type
281 name is encoded as one element, but the field name stays as
282 a string, which, of course, is variable length. */
285 /* OP_TYPE is for parsing types, and used with the "ptype" command
286 so we can look up types that are qualified by scope, either with
287 the GDB "::" operator, or the Modula-2 '.' operator. */
290 /* An un-looked-up identifier. */
293 /* An Objective C Foundation Class NSString constant. */
294 OP (OP_OBJC_NSSTRING)
296 /* A F90 array range operator (for "exp:exp", "exp:", ":exp" and ":"). */
299 /* OP_DECFLOAT is followed by a type pointer in the next exp_element
300 and a dec long constant value in the following exp_element.
301 Then comes another OP_DECFLOAT. */
304 /* OP_ADL_FUNC specifies that the function is to be looked up in an
305 Argument Dependent manner (Koenig lookup). */
308 /* The typeof operator. This has one expression argument, which is
309 evaluated solely for its type. */
312 /* The decltype operator. This has one expression argument, which is
313 evaluated solely for its type. This is similar to typeof, but has
314 slight different semantics. */
317 /* The typeid operator. This has one expression argument. */