1/* Standard language operator definitions for GDB, the GNU debugger. 2 3 Copyright (C) 1986-2013 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/* For (the deleted) Chill and Pascal. */ 91OP (BINOP_IN) /* Returns 1 iff ARG1 IN ARG2. */ 92 93/* This is the "colon operator" used various places in (the 94 deleted) Chill. */ 95OP (BINOP_RANGE) 96 97/* This must be the highest BINOP_ value, for expprint.c. */ 98OP (BINOP_END) 99 100/* Operates on three values computed by following subexpressions. */ 101OP (TERNOP_COND) /* ?: */ 102 103/* A sub-string/sub-array. (the deleted) Chill syntax: 104 OP1(OP2:OP3). Return elements OP2 through OP3 of OP1. */ 105OP (TERNOP_SLICE) 106 107/* Multidimensional subscript operator, such as Modula-2 x[a,b,...]. 108 The dimensionality is encoded in the operator, like the number of 109 function arguments in OP_FUNCALL, I.E. <OP><dimension><OP>. 110 The value of the first following subexpression is subscripted 111 by each of the next following subexpressions, one per dimension. */ 112OP (MULTI_SUBSCRIPT) 113 114/* The OP_... series take immediate following arguments. 115 After the arguments come another OP_... (the same one) 116 so that the grouping can be recognized from the end. */ 117 118/* OP_LONG is followed by a type pointer in the next exp_element 119 and the long constant value in the following exp_element. 120 Then comes another OP_LONG. 121 Thus, the operation occupies four exp_elements. */ 122OP (OP_LONG) 123 124/* OP_DOUBLE is similar but takes a DOUBLEST constant instead of a 125 long. */ 126OP (OP_DOUBLE) 127 128/* OP_VAR_VALUE takes one struct block * in the following element, 129 and one struct symbol * in the following exp_element, followed 130 by another OP_VAR_VALUE, making four exp_elements. If the 131 block is non-NULL, evaluate the symbol relative to the 132 innermost frame executing in that block; if the block is NULL 133 use the selected frame. */ 134OP (OP_VAR_VALUE) 135 136/* OP_VAR_ENTRY_VALUE takes one struct symbol * in the following element, 137 followed by another OP_VAR_ENTRY_VALUE, making three exp_elements. 138 somename@entry may mean parameter value as present at the entry of the 139 current function. Implemented via DW_OP_GNU_entry_value. */ 140OP (OP_VAR_ENTRY_VALUE) 141 142/* OP_LAST is followed by an integer in the next exp_element. 143 The integer is zero for the last value printed, 144 or it is the absolute number of a history element. 145 With another OP_LAST at the end, this makes three exp_elements. */ 146OP (OP_LAST) 147 148/* OP_REGISTER is followed by a string in the next exp_element. 149 This is the name of a register to fetch. */ 150OP (OP_REGISTER) 151 152/* OP_INTERNALVAR is followed by an internalvar ptr in the next 153 exp_element. With another OP_INTERNALVAR at the end, this 154 makes three exp_elements. */ 155OP (OP_INTERNALVAR) 156 157/* OP_FUNCALL is followed by an integer in the next exp_element. 158 The integer is the number of args to the function call. 159 That many plus one values from following subexpressions 160 are used, the first one being the function. 161 The integer is followed by a repeat of OP_FUNCALL, 162 making three exp_elements. */ 163OP (OP_FUNCALL) 164 165/* OP_OBJC_MSGCALL is followed by a string in the next exp_element 166 and then an integer. The string is the selector string. The 167 integer is the number of arguments to the message call. That 168 many plus one values are used, the first one being the object 169 pointer. This is an Objective C message. */ 170OP (OP_OBJC_MSGCALL) 171 172/* This is EXACTLY like OP_FUNCALL but is semantically different. 173 In F77, array subscript expressions, substring expressions and 174 function calls are all exactly the same syntactically. They 175 may only be disambiguated at runtime. Thus this operator, 176 which indicates that we have found something of the form 177 <name> ( <stuff> ). */ 178OP (OP_F77_UNDETERMINED_ARGLIST) 179 180/* OP_COMPLEX takes a type in the following element, followed by another 181 OP_COMPLEX, making three exp_elements. It is followed by two double 182 args, and converts them into a complex number of the given type. */ 183OP (OP_COMPLEX) 184 185/* OP_STRING represents a string constant. 186 Its format is the same as that of a STRUCTOP, but the string 187 data is just made into a string constant when the operation 188 is executed. */ 189OP (OP_STRING) 190 191/* OP_ARRAY creates an array constant out of the following subexpressions. 192 It is followed by two exp_elements, the first containing an integer 193 that is the lower bound of the array and the second containing another 194 integer that is the upper bound of the array. The second integer is 195 followed by a repeat of OP_ARRAY, making four exp_elements total. 196 The bounds are used to compute the number of following subexpressions 197 to consume, as well as setting the bounds in the created array constant. 198 The type of the elements is taken from the type of the first subexp, 199 and they must all match. */ 200OP (OP_ARRAY) 201 202/* UNOP_CAST is followed by a type pointer in the next exp_element. 203 With another UNOP_CAST at the end, this makes three exp_elements. 204 It casts the value of the following subexpression. */ 205OP (UNOP_CAST) 206 207/* Like UNOP_CAST, but the type is a subexpression. */ 208OP (UNOP_CAST_TYPE) 209 210/* The C++ dynamic_cast operator. */ 211OP (UNOP_DYNAMIC_CAST) 212 213/* The C++ reinterpret_cast operator. */ 214OP (UNOP_REINTERPRET_CAST) 215 216/* UNOP_MEMVAL is followed by a type pointer in the next exp_element 217 With another UNOP_MEMVAL at the end, this makes three exp_elements. 218 It casts the contents of the word addressed by the value of the 219 following subexpression. */ 220OP (UNOP_MEMVAL) 221 222/* UNOP_MEMVAL_TLS is followed by a `struct objfile' pointer in the next 223 exp_element and a type pointer in the following exp_element. 224 With another UNOP_MEMVAL_TLS at the end, this makes four exp_elements. 225 It casts the contents of the word offsetted by the value of the 226 following subexpression from the TLS specified by `struct objfile'. */ 227OP (UNOP_MEMVAL_TLS) 228 229/* Like UNOP_MEMVAL, but the type is supplied as a subexpression. */ 230OP (UNOP_MEMVAL_TYPE) 231 232/* UNOP_... operate on one value from a following subexpression 233 and replace it with a result. They take no immediate arguments. */ 234 235OP (UNOP_NEG) /* Unary - */ 236OP (UNOP_LOGICAL_NOT) /* Unary ! */ 237OP (UNOP_COMPLEMENT) /* Unary ~ */ 238OP (UNOP_IND) /* Unary * */ 239OP (UNOP_ADDR) /* Unary & */ 240OP (UNOP_PREINCREMENT) /* ++ before an expression */ 241OP (UNOP_POSTINCREMENT) /* ++ after an expression */ 242OP (UNOP_PREDECREMENT) /* -- before an expression */ 243OP (UNOP_POSTDECREMENT) /* -- after an expression */ 244OP (UNOP_SIZEOF) /* Unary sizeof (followed by expression) */ 245 246OP (UNOP_PLUS) /* Unary plus */ 247 248OP (UNOP_CAP) /* Modula-2 standard (unary) procedures */ 249OP (UNOP_CHR) 250OP (UNOP_ORD) 251OP (UNOP_ABS) 252OP (UNOP_FLOAT) 253OP (UNOP_HIGH) 254OP (UNOP_MAX) 255OP (UNOP_MIN) 256OP (UNOP_ODD) 257OP (UNOP_TRUNC) 258 259OP (OP_BOOL) /* Modula-2 builtin BOOLEAN type */ 260OP (OP_M2_STRING) /* Modula-2 string constants */ 261 262/* STRUCTOP_... operate on a value from a following subexpression 263 by extracting a structure component specified by a string 264 that appears in the following exp_elements (as many as needed). 265 STRUCTOP_STRUCT is used for "." and STRUCTOP_PTR for "->". 266 They differ only in the error message given in case the value is 267 not suitable or the structure component specified is not found. 268 269 The length of the string follows the opcode, followed by 270 BYTES_TO_EXP_ELEM(length) elements containing the data of the 271 string, followed by the length again and the opcode again. */ 272 273OP (STRUCTOP_STRUCT) 274OP (STRUCTOP_PTR) 275 276/* C++: OP_THIS is just a placeholder for the class instance variable. 277 It just comes in a tight (OP_THIS, OP_THIS) pair. */ 278OP (OP_THIS) 279 280/* Objective C: "@selector" pseudo-operator. */ 281OP (OP_OBJC_SELECTOR) 282 283/* OP_SCOPE surrounds a type name and a field name. The type 284 name is encoded as one element, but the field name stays as 285 a string, which, of course, is variable length. */ 286OP (OP_SCOPE) 287 288/* OP_TYPE is for parsing types, and used with the "ptype" command 289 so we can look up types that are qualified by scope, either with 290 the GDB "::" operator, or the Modula-2 '.' operator. */ 291OP (OP_TYPE) 292 293/* An un-looked-up identifier. */ 294OP (OP_NAME) 295 296/* An Objective C Foundation Class NSString constant. */ 297OP (OP_OBJC_NSSTRING) 298 299/* A F90 array range operator (for "exp:exp", "exp:", ":exp" and ":"). */ 300OP (OP_F90_RANGE) 301 302/* OP_DECFLOAT is followed by a type pointer in the next exp_element 303 and a dec long constant value in the following exp_element. 304 Then comes another OP_DECFLOAT. */ 305OP (OP_DECFLOAT) 306 307/* OP_ADL_FUNC specifies that the function is to be looked up in an 308 Argument Dependent manner (Koenig lookup). */ 309OP (OP_ADL_FUNC) 310 311/* The typeof operator. This has one expression argument, which is 312 evaluated solely for its type. */ 313OP (OP_TYPEOF) 314 315/* The decltype operator. This has one expression argument, which is 316 evaluated solely for its type. This is similar to typeof, but has 317 slight different semantics. */ 318OP (OP_DECLTYPE) 319