gdb/std-operator.def

   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.  */
  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 /* This must be the highest BINOP_ value, for expprint.c.  */
  91 OP (BINOP_END)
  92
  93 /* Operates on three values computed by following subexpressions.  */
  94 OP (TERNOP_COND)                /* ?: */
  95
  96 /* A sub-string/sub-array.  Ada syntax: OP1(OP2..OP3).  Return
  97    elements OP2 through OP3 of OP1.  */
  98 OP (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.  */
 105 OP (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.  */
 115 OP (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.  */
 119 OP (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.  */
 127 OP (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.  */
 133 OP (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.  */
 139 OP (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.  */
 145 OP (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.  */
 149 OP (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.  */
 154 OP (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.  */
 162 OP (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.  */
 169 OP (OP_OBJC_MSGCALL)
 170
 171 /* OP_COMPLEX takes a type in the following element, followed by another
 172    OP_COMPLEX, making three exp_elements.  It is followed by two double
 173    args, and converts them into a complex number of the given type.  */
 174 OP (OP_COMPLEX)
 175
 176 /* OP_STRING represents a string constant.
 177    Its format is the same as that of a STRUCTOP, but the string
 178    data is just made into a string constant when the operation
 179    is executed.  */
 180 OP (OP_STRING)
 181
 182 /* OP_ARRAY creates an array constant out of the following subexpressions.
 183    It is followed by two exp_elements, the first containing an integer
 184    that is the lower bound of the array and the second containing another
 185    integer that is the upper bound of the array.  The second integer is
 186    followed by a repeat of OP_ARRAY, making four exp_elements total.
 187    The bounds are used to compute the number of following subexpressions
 188    to consume, as well as setting the bounds in the created array constant.
 189    The type of the elements is taken from the type of the first subexp,
 190    and they must all match.  */
 191 OP (OP_ARRAY)
 192
 193 /* UNOP_CAST is followed by a type pointer in the next exp_element.
 194    With another UNOP_CAST at the end, this makes three exp_elements.
 195    It casts the value of the following subexpression.  */
 196 OP (UNOP_CAST)
 197
 198 /* Like UNOP_CAST, but the type is a subexpression.  */
 199 OP (UNOP_CAST_TYPE)
 200
 201 /* The C++ dynamic_cast operator.  */
 202 OP (UNOP_DYNAMIC_CAST)
 203
 204 /* The C++ reinterpret_cast operator.  */
 205 OP (UNOP_REINTERPRET_CAST)
 206
 207 /* UNOP_MEMVAL is followed by a type pointer in the next exp_element
 208    With another UNOP_MEMVAL at the end, this makes three exp_elements.
 209    It casts the contents of the word addressed by the value of the
 210    following subexpression.  */
 211 OP (UNOP_MEMVAL)
 212
 213 /* Like UNOP_MEMVAL, but the type is supplied as a subexpression.  */
 214 OP (UNOP_MEMVAL_TYPE)
 215
 216 /* UNOP_... operate on one value from a following subexpression
 217    and replace it with a result.  They take no immediate arguments.  */
 218
 219 OP (UNOP_NEG)                   /* Unary - */
 220 OP (UNOP_LOGICAL_NOT)           /* Unary ! */
 221 OP (UNOP_COMPLEMENT)            /* Unary ~ */
 222 OP (UNOP_IND)                   /* Unary * */
 223 OP (UNOP_ADDR)                  /* Unary & */
 224 OP (UNOP_PREINCREMENT)          /* ++ before an expression */
 225 OP (UNOP_POSTINCREMENT)         /* ++ after an expression */
 226 OP (UNOP_PREDECREMENT)          /* -- before an expression */
 227 OP (UNOP_POSTDECREMENT)         /* -- after an expression */
 228 OP (UNOP_SIZEOF)                /* Unary sizeof (followed by expression) */
 229 OP (UNOP_ALIGNOF)               /* Unary alignof (followed by expression) */
 230
 231 OP (UNOP_PLUS)                  /* Unary plus */
 232
 233 OP (UNOP_CAP)                   /* Modula-2 standard (unary) procedures */
 234 OP (UNOP_CHR)
 235 OP (UNOP_ORD)
 236 OP (UNOP_ABS)
 237 OP (UNOP_FLOAT)
 238 OP (UNOP_HIGH)
 239 OP (UNOP_MAX)
 240 OP (UNOP_MIN)
 241 OP (UNOP_ODD)
 242 OP (UNOP_TRUNC)
 243
 244 OP (OP_BOOL)                    /* Modula-2 builtin BOOLEAN type */
 245 OP (OP_M2_STRING)               /* Modula-2 string constants */
 246
 247 /* STRUCTOP_... operate on a value from a following subexpression
 248    by extracting a structure component specified by a string
 249    that appears in the following exp_elements (as many as needed).
 250    STRUCTOP_STRUCT is used for "." and STRUCTOP_PTR for "->".
 251    They differ only in the error message given in case the value is
 252    not suitable or the structure component specified is not found.
 253
 254    The length of the string follows the opcode, followed by
 255    BYTES_TO_EXP_ELEM(length) elements containing the data of the
 256    string, followed by the length again and the opcode again.  */
 257
 258 OP (STRUCTOP_STRUCT)
 259 OP (STRUCTOP_PTR)
 260
 261 /* Anonymous field access, e.g. "foo.3".  Used in Rust.  */
 262 OP (STRUCTOP_ANONYMOUS)
 263
 264 /* C++: OP_THIS is just a placeholder for the class instance variable.
 265    It just comes in a tight (OP_THIS, OP_THIS) pair.  */
 266 OP (OP_THIS)
 267
 268 /* Objective C: "@selector" pseudo-operator.  */
 269 OP (OP_OBJC_SELECTOR)
 270
 271 /* OP_SCOPE surrounds a type name and a field name.  The type
 272    name is encoded as one element, but the field name stays as
 273    a string, which, of course, is variable length.  */
 274 OP (OP_SCOPE)
 275
 276 /* OP_FUNC_STATIC_VAR refers to a function local static variable.  The
 277    function is taken from the following subexpression.  The length of
 278    the variable name as a string follows the opcode, followed by
 279    BYTES_TO_EXP_ELEM(length) elements containing the data of the
 280    string, followed by the length again and the opcode again.
 281
 282    Note this is used by C++, but not C.  The C parser handles local
 283    static variables in the parser directly.  Also, this is only used
 284    in C++ if the function/method name is not quoted, like e.g.:
 285
 286      p S:method()::var
 287      p S:method() const::var
 288
 289    If the function/method is quoted like instead:
 290
 291      p 'S:method() const'::var
 292
 293    then the C-specific handling directly in the parser takes over (see
 294    block/variable productions).
 295
 296    Also, if the whole function+var is quoted like this:
 297
 298      p 'S:method() const::var'
 299
 300    then the whole quoted expression is interpreted as a single symbol
 301    name and we don't use OP_FUNC_STATIC_VAR either.  In that case, the
 302    C++-specific symbol lookup routines take care of the
 303    function-local-static search.  */
 304 OP (OP_FUNC_STATIC_VAR)
 305
 306 /* OP_TYPE is for parsing types, and used with the "ptype" command
 307    so we can look up types that are qualified by scope, either with
 308    the GDB "::" operator, or the Modula-2 '.' operator.  */
 309 OP (OP_TYPE)
 310
 311 /* An un-looked-up identifier.  */
 312 OP (OP_NAME)
 313
 314 /* An Objective C Foundation Class NSString constant.  */
 315 OP (OP_OBJC_NSSTRING)
 316
 317 /* An array range operator (in Fortran 90, for "exp:exp", "exp:",
 318    ":exp" and ":").  */
 319 OP (OP_RANGE)
 320
 321 /* OP_ADL_FUNC specifies that the function is to be looked up in an
 322    Argument Dependent manner (Koenig lookup).  */
 323 OP (OP_ADL_FUNC)
 324
 325 /* The typeof operator.  This has one expression argument, which is
 326    evaluated solely for its type.  */
 327 OP (OP_TYPEOF)
 328
 329 /* The decltype operator.  This has one expression argument, which is
 330    evaluated solely for its type.  This is similar to typeof, but has
 331    slight different semantics.  */
 332 OP (OP_DECLTYPE)
 333
 334 /* The typeid operator.  This has one expression argument.  */
 335 OP (OP_TYPEID)
 336
 337 /* This is used for the Rust [expr; N] form of array construction.  It
 338    takes two expression arguments.  */
 339 OP (OP_RUST_ARRAY)
 340
 341 /* First extension operator.  Some language modules define extra
 342    operators below with numbers higher than OP_EXTENDED0.  */
 343 OP (OP_EXTENDED0)
 344
 345 /* ================ Ada operators ================ */
 346
 347 /* X IN A'RANGE(N).  N is an immediate operand, surrounded by
 348    BINOP_IN_BOUNDS before and after.  A is an array, X an index
 349    value.  Evaluates to true iff X is within range of the Nth
 350    dimension (1-based) of A.  (A multi-dimensional array
 351    type is represented as array of array of ...) */
 352 OP (BINOP_IN_BOUNDS)
 353
 354 /* X IN L .. U.  True iff L <= X <= U.  */
 355 OP (TERNOP_IN_RANGE)
 356
 357 /* Ada attributes ('Foo). */
 358 OP (OP_ATR_FIRST)
 359 OP (OP_ATR_LAST)
 360 OP (OP_ATR_LENGTH)
 361 OP (OP_ATR_IMAGE)
 362 OP (OP_ATR_MAX)
 363 OP (OP_ATR_MIN)
 364 OP (OP_ATR_MODULUS)
 365 OP (OP_ATR_POS)
 366 OP (OP_ATR_SIZE)
 367 OP (OP_ATR_TAG)
 368 OP (OP_ATR_VAL)
 369
 370 /* Ada type qualification.  It is encoded as for UNOP_CAST, above,
 371    and denotes the TYPE'(EXPR) construct. */
 372 OP (UNOP_QUAL)
 373
 374 /* X IN TYPE.  The `TYPE' argument is immediate, with
 375    UNOP_IN_RANGE before and after it. True iff X is a member of
 376    type TYPE (typically a subrange). */
 377 OP (UNOP_IN_RANGE)
 378
 379 /* An aggregate.   A single immediate operand, N>0, gives
 380    the number of component specifications that follow.  The
 381    immediate operand is followed by a second OP_AGGREGATE.
 382    Next come N component specifications.  A component
 383    specification is either an OP_OTHERS (others=>...), an
 384    OP_CHOICES (for named associations), or other expression (for
 385    positional aggregates only).  Aggregates currently
 386    occur only as the right sides of assignments. */
 387 OP (OP_AGGREGATE)
 388
 389 /* An others clause.  Followed by a single expression. */
 390 OP (OP_OTHERS)
 391
 392 /* An aggregate component association.  A single immediate operand, N,
 393    gives the number of choices that follow.  This is followed by a second
 394    OP_CHOICES operator.  Next come N operands, each of which is an
 395    expression, an OP_DISCRETE_RANGE, or an OP_NAME---the latter
 396    for a simple name that must be a record component name and does
 397    not correspond to a single existing symbol.  After the N choice
 398    indicators comes an expression giving the value.
 399
 400    In an aggregate such as (X => E1, ...), where X is a simple
 401    name, X could syntactically be either a component_selector_name
 402    or an expression used as a discrete_choice, depending on the
 403    aggregate's type context.  Since this is not known at parsing
 404    time, we don't attempt to disambiguate X if it has multiple
 405    definitions, but instead supply an OP_NAME.  If X has a single
 406    definition, we represent it with an OP_VAR_VALUE, even though
 407    it may turn out to be within a record aggregate.  Aggregate
 408    evaluation can use either OP_NAMEs or OP_VAR_VALUEs to get a
 409    record field name, and can evaluate OP_VAR_VALUE normally to
 410    get its value as an expression.  Unfortunately, we lose out in
 411    cases where X has multiple meanings and is part of an array
 412    aggregate.  I hope these are not common enough to annoy users,
 413    who can work around the problem in any case by putting
 414    parentheses around X. */
 415 OP (OP_CHOICES)
 416
 417 /* A positional aggregate component association.  The operator is
 418    followed by a single integer indicating the position in the
 419    aggregate (0-based), followed by a second OP_POSITIONAL.  Next
 420    follows a single expression giving the component value.  */
 421 OP (OP_POSITIONAL)
 422
 423 /* A range of values.  Followed by two expressions giving the
 424    upper and lower bounds of the range. */
 425 OP (OP_DISCRETE_RANGE)
 426
 427 /* ================ Fortran operators ================ */
 428
 429 /* This is EXACTLY like OP_FUNCALL but is semantically different.
 430    In F77, array subscript expressions, substring expressions and
 431    function calls are all exactly the same syntactically.  They
 432    may only be disambiguated at runtime.  Thus this operator,
 433    which indicates that we have found something of the form
 434    <name> ( <stuff> ).  */
 435 OP (OP_F77_UNDETERMINED_ARGLIST)
 436
 437 /* Single operand builtins.  */
 438 OP (UNOP_FORTRAN_KIND)
 439 OP (UNOP_FORTRAN_FLOOR)
 440 OP (UNOP_FORTRAN_CEILING)
 441
 442 /* Two operand builtins.  */
 443 OP (BINOP_FORTRAN_CMPLX)
 444 OP (BINOP_FORTRAN_MODULO)