gdb/std-operator.def

   1 /* Standard language operator definitions for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986-2022 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.  */
  22 OP (OP_NULL)
  23
  24 /* BINOP_... operate on two values computed by following subexpressions,
  25 replacing them by one result value.  They take no immediate arguments.  */
  26
  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 */
  51
  52 /* C++.  */
  53
  54 OP (BINOP_MIN)                  /* <? */
  55 OP (BINOP_MAX)                  /* >? */
  56
  57 /* STRUCTOP_MEMBER is used for pointer-to-member constructs.
  58    X .  * Y translates into X STRUCTOP_MEMBER Y.  */
  59 OP (STRUCTOP_MEMBER)
  60
  61 /* STRUCTOP_MPTR is used for pointer-to-member constructs
  62    when X is a pointer instead of an aggregate.  */
  63 OP (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.  */
  70 OP (TYPE_INSTANCE)
  71
  72 /* end of C++.  */
  73
  74 /* For Modula-2 integer division DIV.  */
  75 OP (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.  */
  80 OP (BINOP_ASSIGN_MODIFY)
  81
  82 /* Modula-2 standard (binary) procedures.  */
  83 OP (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.  */
  88 OP (BINOP_CONCAT)
  89
  90 /* Operates on three values computed by following subexpressions.  */
  91 OP (TERNOP_COND)                /* ?: */
  92
  93 /* A sub-string/sub-array.  Ada syntax: OP1(OP2..OP3).  Return
  94    elements OP2 through OP3 of OP1.  */
  95 OP (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.  */
 102 OP (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.  */
 112 OP (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.  */
 116 OP (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.  */
 124 OP (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.  */
 130 OP (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.  */
 136 OP (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.  */
 142 OP (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.  */
 146 OP (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.  */
 151 OP (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.  */
 159 OP (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.  */
 166 OP (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.  */
 171 OP (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.  */
 177 OP (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.  */
 188 OP (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.  */
 197 OP (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.  */
 202 OP (UNOP_CAST)
 203
 204 /* Like UNOP_CAST, but the type is a subexpression.  */
 205 OP (UNOP_CAST_TYPE)
 206
 207 /* The C++ dynamic_cast operator.  */
 208 OP (UNOP_DYNAMIC_CAST)
 209
 210 /* The C++ reinterpret_cast operator.  */
 211 OP (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.  */
 217 OP (UNOP_MEMVAL)
 218
 219 /* Like UNOP_MEMVAL, but the type is supplied as a subexpression.  */
 220 OP (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
 225 OP (UNOP_NEG)                   /* Unary - */
 226 OP (UNOP_LOGICAL_NOT)           /* Unary ! */
 227 OP (UNOP_COMPLEMENT)            /* Unary ~ */
 228 OP (UNOP_IND)                   /* Unary * */
 229 OP (UNOP_ADDR)                  /* Unary & */
 230 OP (UNOP_PREINCREMENT)          /* ++ before an expression */
 231 OP (UNOP_POSTINCREMENT)         /* ++ after an expression */
 232 OP (UNOP_PREDECREMENT)          /* -- before an expression */
 233 OP (UNOP_POSTDECREMENT)         /* -- after an expression */
 234 OP (UNOP_SIZEOF)                /* Unary sizeof (followed by expression) */
 235 OP (UNOP_ALIGNOF)               /* Unary alignof (followed by expression) */
 236
 237 OP (UNOP_PLUS)                  /* Unary plus */
 238
 239 OP (UNOP_ABS)
 240 OP (UNOP_HIGH)
 241
 242 OP (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
 255 OP (STRUCTOP_STRUCT)
 256 OP (STRUCTOP_PTR)
 257
 258 /* Anonymous field access, e.g. "foo.3".  Used in Rust.  */
 259 OP (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.  */
 263 OP (OP_THIS)
 264
 265 /* Objective C: "@selector" pseudo-operator.  */
 266 OP (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.  */
 271 OP (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.  */
 301 OP (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.  */
 306 OP (OP_TYPE)
 307
 308 /* An Objective C Foundation Class NSString constant.  */
 309 OP (OP_OBJC_NSSTRING)
 310
 311 /* An array range operator (in Fortran 90, for "exp:exp", "exp:",
 312    ":exp" and ":").  */
 313 OP (OP_RANGE)
 314
 315 /* OP_ADL_FUNC specifies that the function is to be looked up in an
 316    Argument Dependent manner (Koenig lookup).  */
 317 OP (OP_ADL_FUNC)
 318
 319 /* The typeof operator.  This has one expression argument, which is
 320    evaluated solely for its type.  */
 321 OP (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.  */
 326 OP (OP_DECLTYPE)
 327
 328 /* The typeid operator.  This has one expression argument.  */
 329 OP (OP_TYPEID)
 330
 331 /* This is used for the Rust [expr; N] form of array construction.  It
 332    takes two expression arguments.  */
 333 OP (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 ...) */
 342 OP (BINOP_IN_BOUNDS)
 343
 344 /* X IN L .. U.  True iff L <= X <= U.  */
 345 OP (TERNOP_IN_RANGE)
 346
 347 /* Ada attributes ('Foo). */
 348 OP (OP_ATR_FIRST)
 349 OP (OP_ATR_LAST)
 350 OP (OP_ATR_LENGTH)
 351 OP (OP_ATR_POS)
 352 OP (OP_ATR_SIZE)
 353 OP (OP_ATR_TAG)
 354 OP (OP_ATR_VAL)
 355
 356 /* Ada type qualification.  It is encoded as for UNOP_CAST, above,
 357    and denotes the TYPE'(EXPR) construct. */
 358 OP (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). */
 363 OP (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. */
 373 OP (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> ).  */
 383 OP (OP_F77_UNDETERMINED_ARGLIST)
 384
 385 /* Single operand builtins.  */
 386 OP (UNOP_FORTRAN_KIND)
 387 OP (UNOP_FORTRAN_ALLOCATED)
 388 OP (UNOP_FORTRAN_RANK)
 389 OP (UNOP_FORTRAN_SHAPE)
 390 OP (UNOP_FORTRAN_LOC)
 391
 392 /* Two operand builtins.  */
 393 OP (BINOP_FORTRAN_MODULO)
 394
 395 /* Builtins that take one or two operands.  */
 396 OP (FORTRAN_CEILING)
 397 OP (FORTRAN_FLOOR)
 398 OP (FORTRAN_ASSOCIATED)
 399
 400 /* Builtins that take one, two or three operands.  */
 401 OP (FORTRAN_LBOUND)
 402 OP (FORTRAN_UBOUND)
 403 OP (FORTRAN_CMPLX)
 404 OP (FORTRAN_ARRAY_SIZE)