gdb/std-operator.def

   1 /* Standard language operator definitions for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986-2017 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 /* 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> ).  */
 177 OP (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.  */
 182 OP (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.  */
 188 OP (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.  */
 199 OP (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.  */
 204 OP (UNOP_CAST)
 205
 206 /* Like UNOP_CAST, but the type is a subexpression.  */
 207 OP (UNOP_CAST_TYPE)
 208
 209 /* The C++ dynamic_cast operator.  */
 210 OP (UNOP_DYNAMIC_CAST)
 211
 212 /* The C++ reinterpret_cast operator.  */
 213 OP (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.  */
 219 OP (UNOP_MEMVAL)
 220
 221 /* Like UNOP_MEMVAL, but the type is supplied as a subexpression.  */
 222 OP (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
 227 OP (UNOP_NEG)                   /* Unary - */
 228 OP (UNOP_LOGICAL_NOT)           /* Unary ! */
 229 OP (UNOP_COMPLEMENT)            /* Unary ~ */
 230 OP (UNOP_IND)                   /* Unary * */
 231 OP (UNOP_ADDR)                  /* Unary & */
 232 OP (UNOP_PREINCREMENT)          /* ++ before an expression */
 233 OP (UNOP_POSTINCREMENT)         /* ++ after an expression */
 234 OP (UNOP_PREDECREMENT)          /* -- before an expression */
 235 OP (UNOP_POSTDECREMENT)         /* -- after an expression */
 236 OP (UNOP_SIZEOF)                /* Unary sizeof (followed by expression) */
 237
 238 OP (UNOP_PLUS)                  /* Unary plus */
 239
 240 OP (UNOP_CAP)                   /* Modula-2 standard (unary) procedures */
 241 OP (UNOP_CHR)
 242 OP (UNOP_ORD)
 243 OP (UNOP_ABS)
 244 OP (UNOP_FLOAT)
 245 OP (UNOP_HIGH)
 246 OP (UNOP_MAX)
 247 OP (UNOP_MIN)
 248 OP (UNOP_ODD)
 249 OP (UNOP_TRUNC)
 250
 251 OP (OP_BOOL)                    /* Modula-2 builtin BOOLEAN type */
 252 OP (OP_M2_STRING)               /* Modula-2 string constants */
 253
 254 /* STRUCTOP_... operate on a value from a following subexpression
 255    by extracting a structure component specified by a string
 256    that appears in the following exp_elements (as many as needed).
 257    STRUCTOP_STRUCT is used for "." and STRUCTOP_PTR for "->".
 258    They differ only in the error message given in case the value is
 259    not suitable or the structure component specified is not found.
 260
 261    The length of the string follows the opcode, followed by
 262    BYTES_TO_EXP_ELEM(length) elements containing the data of the
 263    string, followed by the length again and the opcode again.  */
 264
 265 OP (STRUCTOP_STRUCT)
 266 OP (STRUCTOP_PTR)
 267
 268 /* Anonymous field access, e.g. "foo.3".  Used in Rust.  */
 269 OP (STRUCTOP_ANONYMOUS)
 270
 271 /* C++: OP_THIS is just a placeholder for the class instance variable.
 272    It just comes in a tight (OP_THIS, OP_THIS) pair.  */
 273 OP (OP_THIS)
 274
 275 /* Objective C: "@selector" pseudo-operator.  */
 276 OP (OP_OBJC_SELECTOR)
 277
 278 /* OP_SCOPE surrounds a type name and a field name.  The type
 279    name is encoded as one element, but the field name stays as
 280    a string, which, of course, is variable length.  */
 281 OP (OP_SCOPE)
 282
 283 /* OP_FUNC_STATIC_VAR refers to a function local static variable.  The
 284    function is taken from the following subexpression.  The length of
 285    the variable name as a string follows the opcode, followed by
 286    BYTES_TO_EXP_ELEM(length) elements containing the data of the
 287    string, followed by the length again and the opcode again.
 288
 289    Note this is used by C++, but not C.  The C parser handles local
 290    static variables in the parser directly.  Also, this is only used
 291    in C++ if the function/method name is not quoted, like e.g.:
 292
 293      p S:method()::var
 294      p S:method() const::var
 295
 296    If the function/method is quoted like instead:
 297
 298      p 'S:method() const'::var
 299
 300    then the C-specific handling directly in the parser takes over (see
 301    "block/variable productions).
 302
 303    Also, if the whole function+var is quoted like this:
 304
 305      p 'S:method() const::var'
 306
 307    then the whole quoted expression is interpreted as a single symbol
 308    name and we don't use OP_FUNC_STATIC_VAR either.  In that case, the
 309    C++-specific symbol lookup routines take care of the
 310    function-local-static search.  */
 311 OP (OP_FUNC_STATIC_VAR)
 312
 313 /* OP_TYPE is for parsing types, and used with the "ptype" command
 314    so we can look up types that are qualified by scope, either with
 315    the GDB "::" operator, or the Modula-2 '.' operator.  */
 316 OP (OP_TYPE)
 317
 318 /* An un-looked-up identifier.  */
 319 OP (OP_NAME)
 320
 321 /* An Objective C Foundation Class NSString constant.  */
 322 OP (OP_OBJC_NSSTRING)
 323
 324 /* An array range operator (in Fortran 90, for "exp:exp", "exp:",
 325    ":exp" and ":").  */
 326 OP (OP_RANGE)
 327
 328 /* OP_ADL_FUNC specifies that the function is to be looked up in an
 329    Argument Dependent manner (Koenig lookup).  */
 330 OP (OP_ADL_FUNC)
 331
 332 /* The typeof operator.  This has one expression argument, which is
 333    evaluated solely for its type.  */
 334 OP (OP_TYPEOF)
 335
 336 /* The decltype operator.  This has one expression argument, which is
 337    evaluated solely for its type.  This is similar to typeof, but has
 338    slight different semantics.  */
 339 OP (OP_DECLTYPE)
 340
 341 /* The typeid operator.  This has one expression argument.  */
 342 OP (OP_TYPEID)
 343
 344 /* This is used for the Rust [expr; N] form of array construction.  It
 345    takes two expression arguments.  */
 346 OP (OP_RUST_ARRAY)