1/* Standard language operator definitions for GDB, the GNU debugger. 2 3 Copyright (C) 1986-2020 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 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. 11 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. 16 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/>. */ 19 20/* Used when it's necessary to pass an opcode which will be ignored, 21 or to catch uninitialized values. */ 22OP (OP_NULL) 23 24/* BINOP_... operate on two values computed by following subexpressions, 25replacing them by one result value. They take no immediate arguments. */ 26 27OP (BINOP_ADD) /* + */ 28OP (BINOP_SUB) /* - */ 29OP (BINOP_MUL) /* * */ 30OP (BINOP_DIV) /* / */ 31OP (BINOP_REM) /* % */ 32OP (BINOP_MOD) /* mod (Knuth 1.2.4) */ 33OP (BINOP_LSH) /* << */ 34OP (BINOP_RSH) /* >> */ 35OP (BINOP_LOGICAL_AND) /* && */ 36OP (BINOP_LOGICAL_OR) /* || */ 37OP (BINOP_BITWISE_AND) /* & */ 38OP (BINOP_BITWISE_IOR) /* | */ 39OP (BINOP_BITWISE_XOR) /* ^ */ 40OP (BINOP_EQUAL) /* == */ 41OP (BINOP_NOTEQUAL) /* != */ 42OP (BINOP_LESS) /* < */ 43OP (BINOP_GTR) /* > */ 44OP (BINOP_LEQ) /* <= */ 45OP (BINOP_GEQ) /* >= */ 46OP (BINOP_REPEAT) /* @ */ 47OP (BINOP_ASSIGN) /* = */ 48OP (BINOP_COMMA) /* , */ 49OP (BINOP_SUBSCRIPT) /* x[y] */ 50OP (BINOP_EXP) /* Exponentiation */ 51 52/* C++. */ 53 54OP (BINOP_MIN) /* <? */ 55OP (BINOP_MAX) /* >? */ 56 57/* STRUCTOP_MEMBER is used for pointer-to-member constructs. 58 X . * Y translates into X STRUCTOP_MEMBER Y. */ 59OP (STRUCTOP_MEMBER) 60 61/* STRUCTOP_MPTR is used for pointer-to-member constructs 62 when X is a pointer instead of an aggregate. */ 63OP (STRUCTOP_MPTR) 64 65/* TYPE_INSTANCE is used when the user specifies a specific 66 type instantiation for overloaded methods/functions. 67 68 The format is: 69 TYPE_INSTANCE num_types type0 ... typeN num_types TYPE_INSTANCE. */ 70OP (TYPE_INSTANCE) 71 72/* end of C++. */ 73 74/* For Modula-2 integer division DIV. */ 75OP (BINOP_INTDIV) 76 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. */ 80OP (BINOP_ASSIGN_MODIFY) 81 82/* Modula-2 standard (binary) procedures. */ 83OP (BINOP_VAL) 84 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. */ 88OP (BINOP_CONCAT) 89 90/* This must be the highest BINOP_ value, for expprint.c. */ 91OP (BINOP_END) 92 93/* Operates on three values computed by following subexpressions. */ 94OP (TERNOP_COND) /* ?: */ 95 96/* A sub-string/sub-array. Ada syntax: OP1(OP2..OP3). Return 97 elements OP2 through OP3 of OP1. */ 98OP (TERNOP_SLICE) 99 100/* 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. */ 105OP (MULTI_SUBSCRIPT) 106 107/* 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. */ 110 111/* 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. */ 115OP (OP_LONG) 116 117/* OP_FLOAT is similar but takes a floating-point constant encoded in 118 the target format for the given type instead of a long. */ 119OP (OP_FLOAT) 120 121/* 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. */ 127OP (OP_VAR_VALUE) 128 129/* 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. */ 133OP (OP_VAR_ENTRY_VALUE) 134 135/* 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 138 exp_elements. */ 139OP (OP_VAR_MSYM_VALUE) 140 141/* 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. */ 145OP (OP_LAST) 146 147/* OP_REGISTER is followed by a string in the next exp_element. 148 This is the name of a register to fetch. */ 149OP (OP_REGISTER) 150 151/* 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. */ 154OP (OP_INTERNALVAR) 155 156/* 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. */ 162OP (OP_FUNCALL) 163 164/* 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. */ 169OP (OP_OBJC_MSGCALL) 170 171/* 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> ). */ 177OP (OP_F77_UNDETERMINED_ARGLIST) 178 179/* 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. */ 182OP (OP_COMPLEX) 183 184/* 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 187 is executed. */ 188OP (OP_STRING) 189 190/* 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. */ 199OP (OP_ARRAY) 200 201/* 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. */ 204OP (UNOP_CAST) 205 206/* Like UNOP_CAST, but the type is a subexpression. */ 207OP (UNOP_CAST_TYPE) 208 209/* The C++ dynamic_cast operator. */ 210OP (UNOP_DYNAMIC_CAST) 211 212/* The C++ reinterpret_cast operator. */ 213OP (UNOP_REINTERPRET_CAST) 214 215/* 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. */ 219OP (UNOP_MEMVAL) 220 221/* Like UNOP_MEMVAL, but the type is supplied as a subexpression. */ 222OP (UNOP_MEMVAL_TYPE) 223 224/* UNOP_... operate on one value from a following subexpression 225 and replace it with a result. They take no immediate arguments. */ 226 227OP (UNOP_NEG) /* Unary - */ 228OP (UNOP_LOGICAL_NOT) /* Unary ! */ 229OP (UNOP_COMPLEMENT) /* Unary ~ */ 230OP (UNOP_IND) /* Unary * */ 231OP (UNOP_ADDR) /* Unary & */ 232OP (UNOP_PREINCREMENT) /* ++ before an expression */ 233OP (UNOP_POSTINCREMENT) /* ++ after an expression */ 234OP (UNOP_PREDECREMENT) /* -- before an expression */ 235OP (UNOP_POSTDECREMENT) /* -- after an expression */ 236OP (UNOP_SIZEOF) /* Unary sizeof (followed by expression) */ 237OP (UNOP_ALIGNOF) /* Unary alignof (followed by expression) */ 238 239OP (UNOP_PLUS) /* Unary plus */ 240 241OP (UNOP_CAP) /* Modula-2 standard (unary) procedures */ 242OP (UNOP_CHR) 243OP (UNOP_ORD) 244OP (UNOP_ABS) 245OP (UNOP_FLOAT) 246OP (UNOP_HIGH) 247OP (UNOP_MAX) 248OP (UNOP_MIN) 249OP (UNOP_ODD) 250OP (UNOP_TRUNC) 251 252OP (OP_BOOL) /* Modula-2 builtin BOOLEAN type */ 253OP (OP_M2_STRING) /* Modula-2 string constants */ 254 255/* 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. 261 262 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. */ 265 266OP (STRUCTOP_STRUCT) 267OP (STRUCTOP_PTR) 268 269/* Anonymous field access, e.g. "foo.3". Used in Rust. */ 270OP (STRUCTOP_ANONYMOUS) 271 272/* C++: OP_THIS is just a placeholder for the class instance variable. 273 It just comes in a tight (OP_THIS, OP_THIS) pair. */ 274OP (OP_THIS) 275 276/* Objective C: "@selector" pseudo-operator. */ 277OP (OP_OBJC_SELECTOR) 278 279/* 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. */ 282OP (OP_SCOPE) 283 284/* OP_FUNC_STATIC_VAR refers to a function local static variable. The 285 function is taken from the following subexpression. The length of 286 the variable name as a string follows the opcode, followed by 287 BYTES_TO_EXP_ELEM(length) elements containing the data of the 288 string, followed by the length again and the opcode again. 289 290 Note this is used by C++, but not C. The C parser handles local 291 static variables in the parser directly. Also, this is only used 292 in C++ if the function/method name is not quoted, like e.g.: 293 294 p S:method()::var 295 p S:method() const::var 296 297 If the function/method is quoted like instead: 298 299 p 'S:method() const'::var 300 301 then the C-specific handling directly in the parser takes over (see 302 block/variable productions). 303 304 Also, if the whole function+var is quoted like this: 305 306 p 'S:method() const::var' 307 308 then the whole quoted expression is interpreted as a single symbol 309 name and we don't use OP_FUNC_STATIC_VAR either. In that case, the 310 C++-specific symbol lookup routines take care of the 311 function-local-static search. */ 312OP (OP_FUNC_STATIC_VAR) 313 314/* OP_TYPE is for parsing types, and used with the "ptype" command 315 so we can look up types that are qualified by scope, either with 316 the GDB "::" operator, or the Modula-2 '.' operator. */ 317OP (OP_TYPE) 318 319/* An un-looked-up identifier. */ 320OP (OP_NAME) 321 322/* An Objective C Foundation Class NSString constant. */ 323OP (OP_OBJC_NSSTRING) 324 325/* An array range operator (in Fortran 90, for "exp:exp", "exp:", 326 ":exp" and ":"). */ 327OP (OP_RANGE) 328 329/* OP_ADL_FUNC specifies that the function is to be looked up in an 330 Argument Dependent manner (Koenig lookup). */ 331OP (OP_ADL_FUNC) 332 333/* The typeof operator. This has one expression argument, which is 334 evaluated solely for its type. */ 335OP (OP_TYPEOF) 336 337/* The decltype operator. This has one expression argument, which is 338 evaluated solely for its type. This is similar to typeof, but has 339 slight different semantics. */ 340OP (OP_DECLTYPE) 341 342/* The typeid operator. This has one expression argument. */ 343OP (OP_TYPEID) 344 345/* This is used for the Rust [expr; N] form of array construction. It 346 takes two expression arguments. */ 347OP (OP_RUST_ARRAY) 348