1/* Standard language operator definitions for GDB, the GNU debugger. 2 3 Copyright (C) 1986-2023 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/* Operates on three values computed by following subexpressions. */ 91OP (TERNOP_COND) /* ?: */ 92 93/* A sub-string/sub-array. Ada syntax: OP1(OP2..OP3). Return 94 elements OP2 through OP3 of OP1. */ 95OP (TERNOP_SLICE) 96 97/* Multidimensional subscript operator, such as Modula-2 x[a,b,...]. 98 The dimensionality is encoded in the operator, like the number of 99 function arguments in OP_FUNCALL, I.E. <OP><dimension><OP>. 100 The value of the first following subexpression is subscripted 101 by each of the next following subexpressions, one per dimension. */ 102OP (MULTI_SUBSCRIPT) 103 104/* The OP_... series take immediate following arguments. 105 After the arguments come another OP_... (the same one) 106 so that the grouping can be recognized from the end. */ 107 108/* OP_LONG is followed by a type pointer in the next exp_element 109 and the long constant value in the following exp_element. 110 Then comes another OP_LONG. 111 Thus, the operation occupies four exp_elements. */ 112OP (OP_LONG) 113 114/* OP_FLOAT is similar but takes a floating-point constant encoded in 115 the target format for the given type instead of a long. */ 116OP (OP_FLOAT) 117 118/* OP_VAR_VALUE takes one struct block * in the following element, 119 and one struct symbol * in the following exp_element, followed 120 by another OP_VAR_VALUE, making four exp_elements. If the 121 block is non-NULL, evaluate the symbol relative to the 122 innermost frame executing in that block; if the block is NULL 123 use the selected frame. */ 124OP (OP_VAR_VALUE) 125 126/* OP_VAR_ENTRY_VALUE takes one struct symbol * in the following element, 127 followed by another OP_VAR_ENTRY_VALUE, making three exp_elements. 128 somename@entry may mean parameter value as present at the entry of the 129 current function. Implemented via DW_OP_entry_value. */ 130OP (OP_VAR_ENTRY_VALUE) 131 132/* OP_VAR_MSYM_VALUE takes one struct objfile * in the following 133 element, and one struct minimal_symbol * in the following 134 exp_element, followed by another OP_VAR_MSYM_VALUE, making four 135 exp_elements. */ 136OP (OP_VAR_MSYM_VALUE) 137 138/* OP_LAST is followed by an integer in the next exp_element. 139 The integer is zero for the last value printed, 140 or it is the absolute number of a history element. 141 With another OP_LAST at the end, this makes three exp_elements. */ 142OP (OP_LAST) 143 144/* OP_REGISTER is followed by a string in the next exp_element. 145 This is the name of a register to fetch. */ 146OP (OP_REGISTER) 147 148/* OP_INTERNALVAR is followed by an internalvar ptr in the next 149 exp_element. With another OP_INTERNALVAR at the end, this 150 makes three exp_elements. */ 151OP (OP_INTERNALVAR) 152 153/* OP_FUNCALL is followed by an integer in the next exp_element. 154 The integer is the number of args to the function call. 155 That many plus one values from following subexpressions 156 are used, the first one being the function. 157 The integer is followed by a repeat of OP_FUNCALL, 158 making three exp_elements. */ 159OP (OP_FUNCALL) 160 161/* OP_OBJC_MSGCALL is followed by a string in the next exp_element 162 and then an integer. The string is the selector string. The 163 integer is the number of arguments to the message call. That 164 many plus one values are used, the first one being the object 165 pointer. This is an Objective C message. */ 166OP (OP_OBJC_MSGCALL) 167 168/* OP_COMPLEX takes a type in the following element, followed by another 169 OP_COMPLEX, making three exp_elements. It is followed by two double 170 args, and converts them into a complex number of the given type. */ 171OP (OP_COMPLEX) 172 173/* OP_STRING represents a string constant. 174 Its format is the same as that of a STRUCTOP, but the string 175 data is just made into a string constant when the operation 176 is executed. */ 177OP (OP_STRING) 178 179/* OP_ARRAY creates an array constant out of the following subexpressions. 180 It is followed by two exp_elements, the first containing an integer 181 that is the lower bound of the array and the second containing another 182 integer that is the upper bound of the array. The second integer is 183 followed by a repeat of OP_ARRAY, making four exp_elements total. 184 The bounds are used to compute the number of following subexpressions 185 to consume, as well as setting the bounds in the created array constant. 186 The type of the elements is taken from the type of the first subexp, 187 and they must all match. */ 188OP (OP_ARRAY) 189 190/* UNOP_EXTRACT takes a value and a type, like a cast, but, instead of 191 casting the value to the given type, a new value (of the given 192 type) is extracted from the contents of the old value, starting 193 from the least significant byte. 194 195 It is invalid for the given type to be larger than the type of the 196 given value. */ 197OP (UNOP_EXTRACT) 198 199/* 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. */ 202OP (UNOP_CAST) 203 204/* Like UNOP_CAST, but the type is a subexpression. */ 205OP (UNOP_CAST_TYPE) 206 207/* The C++ dynamic_cast operator. */ 208OP (UNOP_DYNAMIC_CAST) 209 210/* The C++ reinterpret_cast operator. */ 211OP (UNOP_REINTERPRET_CAST) 212 213/* 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. */ 217OP (UNOP_MEMVAL) 218 219/* Like UNOP_MEMVAL, but the type is supplied as a subexpression. */ 220OP (UNOP_MEMVAL_TYPE) 221 222/* UNOP_... operate on one value from a following subexpression 223 and replace it with a result. They take no immediate arguments. */ 224 225OP (UNOP_NEG) /* Unary - */ 226OP (UNOP_LOGICAL_NOT) /* Unary ! */ 227OP (UNOP_COMPLEMENT) /* Unary ~ */ 228OP (UNOP_IND) /* Unary * */ 229OP (UNOP_ADDR) /* Unary & */ 230OP (UNOP_PREINCREMENT) /* ++ before an expression */ 231OP (UNOP_POSTINCREMENT) /* ++ after an expression */ 232OP (UNOP_PREDECREMENT) /* -- before an expression */ 233OP (UNOP_POSTDECREMENT) /* -- after an expression */ 234OP (UNOP_SIZEOF) /* Unary sizeof (followed by expression) */ 235OP (UNOP_ALIGNOF) /* Unary alignof (followed by expression) */ 236 237OP (UNOP_PLUS) /* Unary plus */ 238 239OP (UNOP_ABS) 240OP (UNOP_HIGH) 241 242OP (OP_BOOL) /* Modula-2 builtin BOOLEAN type */ 243 244/* STRUCTOP_... operate on a value from a following subexpression 245 by extracting a structure component specified by a string 246 that appears in the following exp_elements (as many as needed). 247 STRUCTOP_STRUCT is used for "." and STRUCTOP_PTR for "->". 248 They differ only in the error message given in case the value is 249 not suitable or the structure component specified is not found. 250 251 The length of the string follows the opcode, followed by 252 BYTES_TO_EXP_ELEM(length) elements containing the data of the 253 string, followed by the length again and the opcode again. */ 254 255OP (STRUCTOP_STRUCT) 256OP (STRUCTOP_PTR) 257 258/* Anonymous field access, e.g. "foo.3". Used in Rust. */ 259OP (STRUCTOP_ANONYMOUS) 260 261/* C++: OP_THIS is just a placeholder for the class instance variable. 262 It just comes in a tight (OP_THIS, OP_THIS) pair. */ 263OP (OP_THIS) 264 265/* Objective C: "@selector" pseudo-operator. */ 266OP (OP_OBJC_SELECTOR) 267 268/* OP_SCOPE surrounds a type name and a field name. The type 269 name is encoded as one element, but the field name stays as 270 a string, which, of course, is variable length. */ 271OP (OP_SCOPE) 272 273/* OP_FUNC_STATIC_VAR refers to a function local static variable. The 274 function is taken from the following subexpression. The length of 275 the variable name as a string follows the opcode, followed by 276 BYTES_TO_EXP_ELEM(length) elements containing the data of the 277 string, followed by the length again and the opcode again. 278 279 Note this is used by C++, but not C. The C parser handles local 280 static variables in the parser directly. Also, this is only used 281 in C++ if the function/method name is not quoted, like e.g.: 282 283 p S:method()::var 284 p S:method() const::var 285 286 If the function/method is quoted like instead: 287 288 p 'S:method() const'::var 289 290 then the C-specific handling directly in the parser takes over (see 291 block/variable productions). 292 293 Also, if the whole function+var is quoted like this: 294 295 p 'S:method() const::var' 296 297 then the whole quoted expression is interpreted as a single symbol 298 name and we don't use OP_FUNC_STATIC_VAR either. In that case, the 299 C++-specific symbol lookup routines take care of the 300 function-local-static search. */ 301OP (OP_FUNC_STATIC_VAR) 302 303/* OP_TYPE is for parsing types, and used with the "ptype" command 304 so we can look up types that are qualified by scope, either with 305 the GDB "::" operator, or the Modula-2 '.' operator. */ 306OP (OP_TYPE) 307 308/* An Objective C Foundation Class NSString constant. */ 309OP (OP_OBJC_NSSTRING) 310 311/* An array range operator (in Fortran 90, for "exp:exp", "exp:", 312 ":exp" and ":"). */ 313OP (OP_RANGE) 314 315/* OP_ADL_FUNC specifies that the function is to be looked up in an 316 Argument Dependent manner (Koenig lookup). */ 317OP (OP_ADL_FUNC) 318 319/* The typeof operator. This has one expression argument, which is 320 evaluated solely for its type. */ 321OP (OP_TYPEOF) 322 323/* The decltype operator. This has one expression argument, which is 324 evaluated solely for its type. This is similar to typeof, but has 325 slight different semantics. */ 326OP (OP_DECLTYPE) 327 328/* The typeid operator. This has one expression argument. */ 329OP (OP_TYPEID) 330 331/* This is used for the Rust [expr; N] form of array construction. It 332 takes two expression arguments. */ 333OP (OP_RUST_ARRAY) 334 335/* ================ Ada operators ================ */ 336 337/* X IN A'RANGE(N). N is an immediate operand, surrounded by 338 BINOP_IN_BOUNDS before and after. A is an array, X an index 339 value. Evaluates to true iff X is within range of the Nth 340 dimension (1-based) of A. (A multi-dimensional array 341 type is represented as array of array of ...) */ 342OP (BINOP_IN_BOUNDS) 343 344/* X IN L .. U. True iff L <= X <= U. */ 345OP (TERNOP_IN_RANGE) 346 347/* Ada attributes ('Foo). */ 348OP (OP_ATR_FIRST) 349OP (OP_ATR_LAST) 350OP (OP_ATR_LENGTH) 351OP (OP_ATR_POS) 352OP (OP_ATR_SIZE) 353OP (OP_ATR_TAG) 354OP (OP_ATR_VAL) 355 356/* Ada type qualification. It is encoded as for UNOP_CAST, above, 357 and denotes the TYPE'(EXPR) construct. */ 358OP (UNOP_QUAL) 359 360/* X IN TYPE. The `TYPE' argument is immediate, with 361 UNOP_IN_RANGE before and after it. True iff X is a member of 362 type TYPE (typically a subrange). */ 363OP (UNOP_IN_RANGE) 364 365/* An aggregate. A single immediate operand, N>0, gives 366 the number of component specifications that follow. The 367 immediate operand is followed by a second OP_AGGREGATE. 368 Next come N component specifications. A component 369 specification is either an OP_OTHERS (others=>...), an 370 OP_CHOICES (for named associations), or other expression (for 371 positional aggregates only). Aggregates currently 372 occur only as the right sides of assignments. */ 373OP (OP_AGGREGATE) 374 375/* ================ Fortran operators ================ */ 376 377/* This is EXACTLY like OP_FUNCALL but is semantically different. 378 In F77, array subscript expressions, substring expressions and 379 function calls are all exactly the same syntactically. They 380 may only be disambiguated at runtime. Thus this operator, 381 which indicates that we have found something of the form 382 <name> ( <stuff> ). */ 383OP (OP_F77_UNDETERMINED_ARGLIST) 384 385/* Single operand builtins. */ 386OP (UNOP_FORTRAN_KIND) 387OP (UNOP_FORTRAN_ALLOCATED) 388OP (UNOP_FORTRAN_RANK) 389OP (UNOP_FORTRAN_SHAPE) 390OP (UNOP_FORTRAN_LOC) 391 392/* Two operand builtins. */ 393OP (BINOP_FORTRAN_MODULO) 394 395/* Builtins that take one or two operands. */ 396OP (FORTRAN_CEILING) 397OP (FORTRAN_FLOOR) 398OP (FORTRAN_ASSOCIATED) 399 400/* Builtins that take one, two or three operands. */ 401OP (FORTRAN_LBOUND) 402OP (FORTRAN_UBOUND) 403OP (FORTRAN_CMPLX) 404OP (FORTRAN_ARRAY_SIZE) 405