1 /* Standard language operator definitions for GDB, the GNU debugger.
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 /* 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_FLOAT is similar but takes a floating-point constant encoded in
118 the target format for the given type instead of a long. */
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_entry_value. */
133 OP (OP_VAR_ENTRY_VALUE)
135 /* OP_VAR_MSYM_VALUE takes one struct objfile * in the following
136 element, and one struct minimal_symbol * in the following
137 exp_element, followed by another OP_VAR_MSYM_VALUE, making four
139 OP (OP_VAR_MSYM_VALUE)
141 /* OP_LAST is followed by an integer in the next exp_element.
142 The integer is zero for the last value printed,
143 or it is the absolute number of a history element.
144 With another OP_LAST at the end, this makes three exp_elements. */
147 /* OP_REGISTER is followed by a string in the next exp_element.
148 This is the name of a register to fetch. */
151 /* OP_INTERNALVAR is followed by an internalvar ptr in the next
152 exp_element. With another OP_INTERNALVAR at the end, this
153 makes three exp_elements. */
156 /* OP_FUNCALL is followed by an integer in the next exp_element.
157 The integer is the number of args to the function call.
158 That many plus one values from following subexpressions
159 are used, the first one being the function.
160 The integer is followed by a repeat of OP_FUNCALL,
161 making three exp_elements. */
164 /* OP_OBJC_MSGCALL is followed by a string in the next exp_element
165 and then an integer. The string is the selector string. The
166 integer is the number of arguments to the message call. That
167 many plus one values are used, the first one being the object
168 pointer. This is an Objective C message. */
171 /* This is EXACTLY like OP_FUNCALL but is semantically different.
172 In F77, array subscript expressions, substring expressions and
173 function calls are all exactly the same syntactically. They
174 may only be disambiguated at runtime. Thus this operator,
175 which indicates that we have found something of the form
176 <name> ( <stuff> ). */
177 OP (OP_F77_UNDETERMINED_ARGLIST)
179 /* OP_COMPLEX takes a type in the following element, followed by another
180 OP_COMPLEX, making three exp_elements. It is followed by two double
181 args, and converts them into a complex number of the given type. */
184 /* OP_STRING represents a string constant.
185 Its format is the same as that of a STRUCTOP, but the string
186 data is just made into a string constant when the operation
190 /* OP_ARRAY creates an array constant out of the following subexpressions.
191 It is followed by two exp_elements, the first containing an integer
192 that is the lower bound of the array and the second containing another
193 integer that is the upper bound of the array. The second integer is
194 followed by a repeat of OP_ARRAY, making four exp_elements total.
195 The bounds are used to compute the number of following subexpressions
196 to consume, as well as setting the bounds in the created array constant.
197 The type of the elements is taken from the type of the first subexp,
198 and they must all match. */
201 /* UNOP_CAST is followed by a type pointer in the next exp_element.
202 With another UNOP_CAST at the end, this makes three exp_elements.
203 It casts the value of the following subexpression. */
206 /* Like UNOP_CAST, but the type is a subexpression. */
209 /* The C++ dynamic_cast operator. */
210 OP (UNOP_DYNAMIC_CAST)
212 /* The C++ reinterpret_cast operator. */
213 OP (UNOP_REINTERPRET_CAST)
215 /* UNOP_MEMVAL is followed by a type pointer in the next exp_element
216 With another UNOP_MEMVAL at the end, this makes three exp_elements.
217 It casts the contents of the word addressed by the value of the
218 following subexpression. */
221 /* Like UNOP_MEMVAL, but the type is supplied as a subexpression. */
222 OP (UNOP_MEMVAL_TYPE)
224 /* UNOP_... operate on one value from a following subexpression
225 and replace it with a result. They take no immediate arguments. */
227 OP (UNOP_NEG) /* Unary - */
228 OP (UNOP_LOGICAL_NOT) /* Unary ! */
229 OP (UNOP_COMPLEMENT) /* Unary ~ */
230 OP (UNOP_IND) /* Unary * */
231 OP (UNOP_ADDR) /* Unary & */
232 OP (UNOP_PREINCREMENT) /* ++ before an expression */
233 OP (UNOP_POSTINCREMENT) /* ++ after an expression */
234 OP (UNOP_PREDECREMENT) /* -- before an expression */
235 OP (UNOP_POSTDECREMENT) /* -- after an expression */
236 OP (UNOP_SIZEOF) /* Unary sizeof (followed by expression) */
238 OP (UNOP_PLUS) /* Unary plus */
240 OP (UNOP_CAP) /* Modula-2 standard (unary) procedures */
251 OP (OP_BOOL) /* Modula-2 builtin BOOLEAN type */
252 OP (OP_M2_STRING) /* Modula-2 string constants */
254 /* STRUCTOP_... operate on a value from a following subexpression
255 by extracting a structure component specified by a string
256 that appears in the following exp_elements (as many as needed).
257 STRUCTOP_STRUCT is used for "." and STRUCTOP_PTR for "->".
258 They differ only in the error message given in case the value is
259 not suitable or the structure component specified is not found.
261 The length of the string follows the opcode, followed by
262 BYTES_TO_EXP_ELEM(length) elements containing the data of the
263 string, followed by the length again and the opcode again. */
268 /* Anonymous field access, e.g. "foo.3". Used in Rust. */
269 OP (STRUCTOP_ANONYMOUS)
271 /* C++: OP_THIS is just a placeholder for the class instance variable.
272 It just comes in a tight (OP_THIS, OP_THIS) pair. */
275 /* Objective C: "@selector" pseudo-operator. */
276 OP (OP_OBJC_SELECTOR)
278 /* OP_SCOPE surrounds a type name and a field name. The type
279 name is encoded as one element, but the field name stays as
280 a string, which, of course, is variable length. */
283 /* OP_FUNC_STATIC_VAR refers to a function local static variable. The
284 function is taken from the following subexpression. The length of
285 the variable name as a string follows the opcode, followed by
286 BYTES_TO_EXP_ELEM(length) elements containing the data of the
287 string, followed by the length again and the opcode again.
289 Note this is used by C++, but not C. The C parser handles local
290 static variables in the parser directly. Also, this is only used
291 in C++ if the function/method name is not quoted, like e.g.:
294 p S:method() const::var
296 If the function/method is quoted like instead:
298 p 'S:method() const'::var
300 then the C-specific handling directly in the parser takes over (see
301 "block/variable productions).
303 Also, if the whole function+var is quoted like this:
305 p 'S:method() const::var'
307 then the whole quoted expression is interpreted as a single symbol
308 name and we don't use OP_FUNC_STATIC_VAR either. In that case, the
309 C++-specific symbol lookup routines take care of the
310 function-local-static search. */
311 OP (OP_FUNC_STATIC_VAR)
313 /* OP_TYPE is for parsing types, and used with the "ptype" command
314 so we can look up types that are qualified by scope, either with
315 the GDB "::" operator, or the Modula-2 '.' operator. */
318 /* An un-looked-up identifier. */
321 /* An Objective C Foundation Class NSString constant. */
322 OP (OP_OBJC_NSSTRING)
324 /* An array range operator (in Fortran 90, for "exp:exp", "exp:",
328 /* OP_ADL_FUNC specifies that the function is to be looked up in an
329 Argument Dependent manner (Koenig lookup). */
332 /* The typeof operator. This has one expression argument, which is
333 evaluated solely for its type. */
336 /* The decltype operator. This has one expression argument, which is
337 evaluated solely for its type. This is similar to typeof, but has
338 slight different semantics. */
341 /* The typeid operator. This has one expression argument. */
344 /* This is used for the Rust [expr; N] form of array construction. It
345 takes two expression arguments. */