1 /* Standard language operator definitions for GDB, the GNU debugger.
3 Copyright (C) 1986-2016 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 must be the highest BINOP_ value, for expprint.c. */
93 /* Operates on three values computed by following subexpressions. */
94 OP (TERNOP_COND) /* ?: */
96 /* A sub-string/sub-array. Ada syntax: OP1(OP2..OP3). Return
97 elements OP2 through OP3 of OP1. */
100 /* Multidimensional subscript operator, such as Modula-2 x[a,b,...].
101 The dimensionality is encoded in the operator, like the number of
102 function arguments in OP_FUNCALL, I.E. <OP><dimension><OP>.
103 The value of the first following subexpression is subscripted
104 by each of the next following subexpressions, one per dimension. */
107 /* The OP_... series take immediate following arguments.
108 After the arguments come another OP_... (the same one)
109 so that the grouping can be recognized from the end. */
111 /* OP_LONG is followed by a type pointer in the next exp_element
112 and the long constant value in the following exp_element.
113 Then comes another OP_LONG.
114 Thus, the operation occupies four exp_elements. */
117 /* OP_DOUBLE is similar but takes a DOUBLEST constant instead of a
121 /* OP_VAR_VALUE takes one struct block * in the following element,
122 and one struct symbol * in the following exp_element, followed
123 by another OP_VAR_VALUE, making four exp_elements. If the
124 block is non-NULL, evaluate the symbol relative to the
125 innermost frame executing in that block; if the block is NULL
126 use the selected frame. */
129 /* OP_VAR_ENTRY_VALUE takes one struct symbol * in the following element,
130 followed by another OP_VAR_ENTRY_VALUE, making three exp_elements.
131 somename@entry may mean parameter value as present at the entry of the
132 current function. Implemented via DW_OP_GNU_entry_value. */
133 OP (OP_VAR_ENTRY_VALUE)
135 /* OP_LAST is followed by an integer in the next exp_element.
136 The integer is zero for the last value printed,
137 or it is the absolute number of a history element.
138 With another OP_LAST at the end, this makes three exp_elements. */
141 /* OP_REGISTER is followed by a string in the next exp_element.
142 This is the name of a register to fetch. */
145 /* OP_INTERNALVAR is followed by an internalvar ptr in the next
146 exp_element. With another OP_INTERNALVAR at the end, this
147 makes three exp_elements. */
150 /* OP_FUNCALL is followed by an integer in the next exp_element.
151 The integer is the number of args to the function call.
152 That many plus one values from following subexpressions
153 are used, the first one being the function.
154 The integer is followed by a repeat of OP_FUNCALL,
155 making three exp_elements. */
158 /* OP_OBJC_MSGCALL is followed by a string in the next exp_element
159 and then an integer. The string is the selector string. The
160 integer is the number of arguments to the message call. That
161 many plus one values are used, the first one being the object
162 pointer. This is an Objective C message. */
165 /* This is EXACTLY like OP_FUNCALL but is semantically different.
166 In F77, array subscript expressions, substring expressions and
167 function calls are all exactly the same syntactically. They
168 may only be disambiguated at runtime. Thus this operator,
169 which indicates that we have found something of the form
170 <name> ( <stuff> ). */
171 OP (OP_F77_UNDETERMINED_ARGLIST)
173 /* OP_COMPLEX takes a type in the following element, followed by another
174 OP_COMPLEX, making three exp_elements. It is followed by two double
175 args, and converts them into a complex number of the given type. */
178 /* OP_STRING represents a string constant.
179 Its format is the same as that of a STRUCTOP, but the string
180 data is just made into a string constant when the operation
184 /* OP_ARRAY creates an array constant out of the following subexpressions.
185 It is followed by two exp_elements, the first containing an integer
186 that is the lower bound of the array and the second containing another
187 integer that is the upper bound of the array. The second integer is
188 followed by a repeat of OP_ARRAY, making four exp_elements total.
189 The bounds are used to compute the number of following subexpressions
190 to consume, as well as setting the bounds in the created array constant.
191 The type of the elements is taken from the type of the first subexp,
192 and they must all match. */
195 /* UNOP_CAST is followed by a type pointer in the next exp_element.
196 With another UNOP_CAST at the end, this makes three exp_elements.
197 It casts the value of the following subexpression. */
200 /* Like UNOP_CAST, but the type is a subexpression. */
203 /* The C++ dynamic_cast operator. */
204 OP (UNOP_DYNAMIC_CAST)
206 /* The C++ reinterpret_cast operator. */
207 OP (UNOP_REINTERPRET_CAST)
209 /* UNOP_MEMVAL is followed by a type pointer in the next exp_element
210 With another UNOP_MEMVAL at the end, this makes three exp_elements.
211 It casts the contents of the word addressed by the value of the
212 following subexpression. */
215 /* UNOP_MEMVAL_TLS is followed by a `struct objfile' pointer in the next
216 exp_element and a type pointer in the following exp_element.
217 With another UNOP_MEMVAL_TLS at the end, this makes four exp_elements.
218 It casts the contents of the word offsetted by the value of the
219 following subexpression from the TLS specified by `struct objfile'. */
222 /* Like UNOP_MEMVAL, but the type is supplied as a subexpression. */
223 OP (UNOP_MEMVAL_TYPE)
225 /* UNOP_... operate on one value from a following subexpression
226 and replace it with a result. They take no immediate arguments. */
228 OP (UNOP_NEG) /* Unary - */
229 OP (UNOP_LOGICAL_NOT) /* Unary ! */
230 OP (UNOP_COMPLEMENT) /* Unary ~ */
231 OP (UNOP_IND) /* Unary * */
232 OP (UNOP_ADDR) /* Unary & */
233 OP (UNOP_PREINCREMENT) /* ++ before an expression */
234 OP (UNOP_POSTINCREMENT) /* ++ after an expression */
235 OP (UNOP_PREDECREMENT) /* -- before an expression */
236 OP (UNOP_POSTDECREMENT) /* -- after an expression */
237 OP (UNOP_SIZEOF) /* Unary sizeof (followed by expression) */
239 OP (UNOP_PLUS) /* Unary plus */
241 OP (UNOP_CAP) /* Modula-2 standard (unary) procedures */
252 OP (OP_BOOL) /* Modula-2 builtin BOOLEAN type */
253 OP (OP_M2_STRING) /* Modula-2 string constants */
255 /* STRUCTOP_... operate on a value from a following subexpression
256 by extracting a structure component specified by a string
257 that appears in the following exp_elements (as many as needed).
258 STRUCTOP_STRUCT is used for "." and STRUCTOP_PTR for "->".
259 They differ only in the error message given in case the value is
260 not suitable or the structure component specified is not found.
262 The length of the string follows the opcode, followed by
263 BYTES_TO_EXP_ELEM(length) elements containing the data of the
264 string, followed by the length again and the opcode again. */
269 /* Anonymous field access, e.g. "foo.3". Used in Rust. */
270 OP (STRUCTOP_ANONYMOUS)
272 /* C++: OP_THIS is just a placeholder for the class instance variable.
273 It just comes in a tight (OP_THIS, OP_THIS) pair. */
276 /* Objective C: "@selector" pseudo-operator. */
277 OP (OP_OBJC_SELECTOR)
279 /* OP_SCOPE surrounds a type name and a field name. The type
280 name is encoded as one element, but the field name stays as
281 a string, which, of course, is variable length. */
284 /* OP_TYPE is for parsing types, and used with the "ptype" command
285 so we can look up types that are qualified by scope, either with
286 the GDB "::" operator, or the Modula-2 '.' operator. */
289 /* An un-looked-up identifier. */
292 /* An Objective C Foundation Class NSString constant. */
293 OP (OP_OBJC_NSSTRING)
295 /* A F90 array range operator (for "exp:exp", "exp:", ":exp" and ":"). */
298 /* OP_DECFLOAT is followed by a type pointer in the next exp_element
299 and a dec long constant value in the following exp_element.
300 Then comes another OP_DECFLOAT. */
303 /* OP_ADL_FUNC specifies that the function is to be looked up in an
304 Argument Dependent manner (Koenig lookup). */
307 /* The typeof operator. This has one expression argument, which is
308 evaluated solely for its type. */
311 /* The decltype operator. This has one expression argument, which is
312 evaluated solely for its type. This is similar to typeof, but has
313 slight different semantics. */
316 /* The typeid operator. This has one expression argument. */
319 /* This is used for the Rust [expr; N] form of array construction. It
320 takes two expression arguments. */