gcc/cp/cp-tree.def

   1 /* This file contains the definitions and documentation for the
   2    additional tree codes used in the GNU C++ compiler (see tree.def
   3    for the standard codes).
   4    Copyright (C) 1987, 1988, 1990, 1993, 1997, 1998, 2003,
   5    1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   6    Hacked by Michael Tiemann (tiemann@cygnus.com)
   7
   8 This file is part of GCC.
   9
  10 GCC is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 2, or (at your option)
  13 any later version.
  14
  15 GCC is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GCC; see the file COPYING.  If not, write to
  22 the Free Software Foundation, 59 Temple Place - Suite 330,
  23 Boston, MA 02111-1307, USA.  */
  24
  25
  26 /* An OFFSET_REF is used in two situations:
  27
  28    1. An expression of the form `A::m' where `A' is a class and `m' is
  29       a non-static data member.  In this case, operand 0 will be a
  30       TYPE (corresponding to `A') and operand 1 will be a FIELD_DECL
  31       (corresponding to `m'.
  32
  33       The expression is a pointer-to-member if its address is taken,
  34       but simply denotes a member of the object if its address isnot
  35       taken.  In the latter case, resolve_offset_ref is used to
  36       convert it to a representation of the member referred to by the
  37       OFFSET_REF.
  38
  39    2. An expression of the form `x.*p'.  In this case, operand 0 will
  40       be an expression corresponding to `x' and operand 1 will be an
  41       expression with pointer-to-member type.
  42
  43    OFFSET_REFs are only used during the parsing phase; once semantic
  44    analysis has taken place they are eliminated.  */
  45 DEFTREECODE (OFFSET_REF, "offset_ref", 'r', 2)
  46
  47 /* A pointer-to-member constant.  For a pointer-to-member constant
  48    `X::Y' The PTRMEM_CST_CLASS is the RECORD_TYPE for `X' and the
  49    PTRMEM_CST_MEMBER is the _DECL for `Y'.  */
  50 DEFTREECODE (PTRMEM_CST, "ptrmem_cst", 'c', 0)
  51
  52 /* For NEW_EXPR, operand 0 is the placement list.
  53    Operand 1 is the new-declarator.
  54    Operand 2 is the initializer.  */
  55 DEFTREECODE (NEW_EXPR, "nw_expr", 'e', 3)
  56 DEFTREECODE (VEC_NEW_EXPR, "vec_nw_expr", 'e', 3)
  57
  58 /* For DELETE_EXPR, operand 0 is the store to be destroyed.
  59    Operand 1 is the value to pass to the destroying function
  60    saying whether the store should be deallocated as well.  */
  61 DEFTREECODE (DELETE_EXPR, "dl_expr", 'e', 2)
  62 DEFTREECODE (VEC_DELETE_EXPR, "vec_dl_expr", 'e', 2)
  63
  64 /* Value is reference to particular overloaded class method.
  65    Operand 0 is the class name (an IDENTIFIER_NODE);
  66    operand 1 is the field (also an IDENTIFIER_NODE).
  67    The COMPLEXITY field holds the class level (usually 0).  */
  68 DEFTREECODE (SCOPE_REF, "scope_ref", 'r', 2)
  69
  70 /* When composing an object with a member, this is the result.
  71    Operand 0 is the object.  Operand 1 is the member (usually
  72    a dereferenced pointer to member).  */
  73 DEFTREECODE (MEMBER_REF, "member_ref", 'r', 2)
  74
  75 /* Type conversion operator in C++.  TREE_TYPE is type that this
  76    operator converts to.  Operand is expression to be converted.  */
  77 DEFTREECODE (TYPE_EXPR, "type_expr", 'e', 1)
  78
  79 /* For AGGR_INIT_EXPR, operand 0 is function which performs initialization,
  80    operand 1 is argument list to initialization function,
  81    and operand 2 is the slot which was allocated for this expression.  */
  82 DEFTREECODE (AGGR_INIT_EXPR, "aggr_init_expr", 'e', 3)
  83
  84 /* A throw expression.  operand 0 is the expression, if there was one,
  85    else it is NULL_TREE.  */
  86 DEFTREECODE (THROW_EXPR, "throw_expr", 'e', 1)
  87
  88 /* An empty class object.  The TREE_TYPE gives the class type.  We use
  89    these to avoid actually creating instances of the empty classes.  */
  90 DEFTREECODE (EMPTY_CLASS_EXPR, "empty_class_expr", 'e', 0)
  91
  92 /* A DECL which is really just a placeholder for an expression.  Used to
  93    implement non-class scope anonymous unions.  */
  94 DEFTREECODE (ALIAS_DECL, "alias_decl", 'd', 0)
  95
  96 /* A reference to a member function or member functions from a base
  97    class.  BASELINK_FUNCTIONS gives the FUNCTION_DECL,
  98    TEMPLATE_DECL, OVERLOAD, or TEMPLATE_ID_EXPR corresponding to the
  99    functions.  BASELINK_BINFO gives the base from which the functions
 100    come, i.e., the base to which the `this' pointer must be converted
 101    before the functions are called.  BASELINK_ACCESS_BINFO gives the
 102    base used to name the functions.
 103
 104    A BASELINK is an expression; the TREE_TYPE of the BASELINK gives
 105    the type of the expression.  This type is either a FUNCTION_TYPE,
 106    METHOD_TYPE, or `unknown_type_node' indicating that the function is
 107    overloaded. */
 108 DEFTREECODE (BASELINK, "baselink", 'x', 0)
 109
 110 /* Template definition.  The following fields have the specified uses,
 111    although there are other macros in cp-tree.h that should be used for
 112    accessing this data.
 113         DECL_ARGUMENTS          template parm vector
 114         DECL_TEMPLATE_INFO      template text &c
 115         DECL_VINDEX             list of instantiations already produced;
 116                                 only done for functions so far
 117    For class template:
 118         DECL_INITIAL            associated templates (methods &c)
 119         DECL_TEMPLATE_RESULT    null
 120    For non-class templates:
 121         TREE_TYPE               type of object to be constructed
 122         DECL_TEMPLATE_RESULT    decl for object to be created
 123                                 (e.g., FUNCTION_DECL with tmpl parms used)
 124  */
 125 DEFTREECODE (TEMPLATE_DECL, "template_decl", 'd', 0)
 126
 127 /* Index into a template parameter list.  The TEMPLATE_PARM_IDX gives
 128    the index (from 0) of the parameter, while the TEMPLATE_PARM_LEVEL
 129    gives the level (from 1) of the parameter.
 130
 131    Here's an example:
 132
 133    template <class T> // Index 0, Level 1.
 134    struct S
 135    {
 136       template <class U, // Index 0, Level 2.
 137                 class V> // Index 1, Level 2.
 138       void f();
 139    };
 140
 141    The DESCENDANTS will be a chain of TEMPLATE_PARM_INDEXs descended
 142    from this one.  The first descendant will have the same IDX, but
 143    its LEVEL will be one less.  The TREE_CHAIN field is used to chain
 144    together the descendants.  The TEMPLATE_PARM_DECL is the
 145    declaration of this parameter, either a TYPE_DECL or CONST_DECL.
 146    The TEMPLATE_PARM_ORIG_LEVEL is the LEVEL of the most distant
 147    parent, i.e., the LEVEL that the parameter originally had when it
 148    was declared.  For example, if we instantiate S<int>, we will have:
 149
 150    struct S<int>
 151    {
 152      template <class U, // Index 0, Level 1, Orig Level 2
 153                class V> // Index 1, Level 1, Orig Level 2
 154      void f();
 155    };
 156
 157    The LEVEL is the level of the parameter when we are worrying about
 158    the types of things; the ORIG_LEVEL is the level when we are
 159    worrying about instantiating things.  */
 160 DEFTREECODE (TEMPLATE_PARM_INDEX, "template_parm_index", 'x', 0)
 161
 162 /* Index into a template parameter list.  This parameter must be a type.
 163    The TYPE_FIELDS value will be a TEMPLATE_PARM_INDEX.  */
 164 DEFTREECODE (TEMPLATE_TYPE_PARM, "template_type_parm", 't', 0)
 165
 166 /* Index into a template parameter list for template template parameters.
 167    This parameter must be a type.  The TYPE_FIELDS value will be a
 168    TEMPLATE_PARM_INDEX.
 169
 170    It is used without template arguments like TT in C<TT>,
 171    TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO is NULL_TREE
 172    and TYPE_NAME is a TEMPLATE_DECL.  */
 173 DEFTREECODE (TEMPLATE_TEMPLATE_PARM, "template_template_parm", 't', 0)
 174
 175 /* Like TEMPLATE_TEMPLATE_PARM it is used with bound template arguments
 176    like TT<int>.
 177    In this case, TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO contains the
 178    template name and its bound arguments.  TYPE_NAME is a TYPE_DECL.  */
 179 DEFTREECODE (BOUND_TEMPLATE_TEMPLATE_PARM, "bound_template_template_parm", 't', 0)
 180
 181 /* A type designated by `typename T::t'.  TYPE_CONTEXT is `T',
 182    TYPE_NAME is an IDENTIFIER_NODE for `t'.  If the type was named via
 183    template-id, TYPENAME_TYPE_FULLNAME will hold the TEMPLATE_ID_EXPR.
 184    If TREE_TYPE is present, this type was generated by the implicit
 185    typename extension, and the TREE_TYPE is a _TYPE from a baseclass
 186    of `T'.  */
 187 DEFTREECODE (TYPENAME_TYPE, "typename_type", 't', 0)
 188
 189 /* For template template argument of the form `T::template C'.
 190    TYPE_CONTEXT is `T', the template parameter dependent object.
 191    TYPE_NAME is an IDENTIFIER_NODE for `C', the member class template.  */
 192 DEFTREECODE (UNBOUND_CLASS_TEMPLATE, "unbound_class_template", 't', 0)
 193
 194 /* A type designated by `__typeof (expr)'.  TYPE_FIELDS is the
 195    expression in question.  */
 196 DEFTREECODE (TYPEOF_TYPE, "typeof_type", 't', 0)
 197
 198 /* A using declaration.  DECL_INITIAL contains the specified scope.
 199    This is not an alias, but is later expanded into multiple aliases.  */
 200 DEFTREECODE (USING_DECL, "using_decl", 'd', 0)
 201
 202 /* A using directive. The operand is USING_STMT_NAMESPACE. */
 203 DEFTREECODE (USING_STMT, "using_directive", 'e', 1)
 204
 205 /* An un-parsed default argument.  Looks like an IDENTIFIER_NODE.  */
 206 DEFTREECODE (DEFAULT_ARG, "default_arg", 'x', 0)
 207
 208 /* A template-id, like foo<int>.  The first operand is the template.
 209    The second is the TREE_LIST or TREE_VEC of explicitly specified
 210    arguments.  The template will be a FUNCTION_DECL, TEMPLATE_DECL, or
 211    an OVERLOAD.  If the template-id refers to a member template, the
 212    template may be an IDENTIFIER_NODE.  In an uninstantiated template,
 213    the template may be a LOOKUP_EXPR.  */
 214 DEFTREECODE (TEMPLATE_ID_EXPR, "template_id_expr", 'e', 2)
 215
 216 /* A list-like node for chaining overloading candidates. TREE_TYPE is
 217    the original name, and the parameter is the FUNCTION_DECL.  */
 218 DEFTREECODE (OVERLOAD, "overload", 'x', 0)
 219
 220 /* A generic wrapper for something not tree that we want to include in
 221    tree structure.  */
 222 DEFTREECODE (WRAPPER, "wrapper", 'x', 0)
 223
 224 /* Used to represent deferred name lookup for dependent names while
 225    parsing a template declaration.  The first argument is an
 226    IDENTIFIER_NODE for the name in question.  The TREE_TYPE is
 227    unused.  */
 228 DEFTREECODE (LOOKUP_EXPR, "lookup_expr", 'e', 1)
 229
 230 /* A whole bunch of tree codes for the initial, superficial parsing of
 231    templates.  */
 232 DEFTREECODE (MODOP_EXPR, "modop_expr", 'e', 3)
 233 DEFTREECODE (CAST_EXPR, "cast_expr", '1', 1)
 234 DEFTREECODE (REINTERPRET_CAST_EXPR, "reinterpret_cast_expr", '1', 1)
 235 DEFTREECODE (CONST_CAST_EXPR, "const_cast_expr", '1', 1)
 236 DEFTREECODE (STATIC_CAST_EXPR, "static_cast_expr", '1', 1)
 237 DEFTREECODE (DYNAMIC_CAST_EXPR, "dynamic_cast_expr", '1', 1)
 238 DEFTREECODE (DOTSTAR_EXPR, "dotstar_expr", 'e', 2)
 239 DEFTREECODE (TYPEID_EXPR, "typeid_expr", 'e', 1)
 240 DEFTREECODE (PSEUDO_DTOR_EXPR, "pseudo_dtor_expr", 'e', 3)
 241
 242 /* CTOR_INITIALIZER is a placeholder in template code for a call to
 243    setup_vtbl_pointer (and appears in all functions, not just ctors).  */
 244 DEFTREECODE (CTOR_INITIALIZER, "ctor_initializer", 'e', 1)
 245 DEFTREECODE (TRY_BLOCK, "try_block", 'e', 2)
 246 DEFTREECODE (EH_SPEC_BLOCK, "eh_spec_block", 'e', 2)
 247 /* A HANDLER wraps a catch handler for the HANDLER_TYPE.  If this is
 248    CATCH_ALL_TYPE, then the handler catches all types.  The declaration of
 249    the catch variable is in HANDLER_PARMS, and the body block in
 250    HANDLER_BODY.  */
 251 DEFTREECODE (HANDLER, "handler", 'e', 2)
 252
 253 /* A MUST_NOT_THROW_EXPR wraps an expression that may not
 254    throw, and must call terminate if it does.  */
 255 DEFTREECODE (MUST_NOT_THROW_EXPR, "must_not_throw_expr", 'e', 1)
 256
 257 DEFTREECODE (TAG_DEFN, "tag_defn", 'e', 0)
 258
 259 /* The following codes are used to represent implicit conversion
 260    sequences, in the sense of [over.best.ics].  The conversion
 261    sequences are connected through their first operands, with the
 262    first conversion to be performed at the end of the chain.
 263
 264    The innermost conversion (i.e, the one at the end of the chain) is
 265    always an IDENTITY_CONV, corresponding to the identity conversion.  */
 266
 267 DEFTREECODE (IDENTITY_CONV, "identity_conv", 'e', 1)
 268 DEFTREECODE (LVALUE_CONV, "lvalue_conv", 'e', 1)
 269 DEFTREECODE (QUAL_CONV, "qual_conv", 'e', 1)
 270 DEFTREECODE (STD_CONV, "std_conv", 'e', 1)
 271 DEFTREECODE (PTR_CONV, "ptr_conv", 'e', 1)
 272 DEFTREECODE (PMEM_CONV, "pmem_conv", 'e', 1)
 273 DEFTREECODE (BASE_CONV, "base_conv", 'e', 1)
 274 DEFTREECODE (REF_BIND, "ref_bind", 'e', 1)
 275 DEFTREECODE (USER_CONV, "user_conv", 'e', 2)
 276 DEFTREECODE (AMBIG_CONV, "ambig_conv", 'e', 1)
 277 DEFTREECODE (RVALUE_CONV, "rvalue_conv", 'e', 1)
 278
 279 /*
 280 Local variables:
 281 mode:c
 282 End:
 283 */