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, 2004,
   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 member.  In this case, operand 0 will be a TYPE
  30       (corresponding to `A') and operand 1 will be a FIELD_DECL,
  31       BASELINK, or TEMPLATE_ID_EXPR (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       This form is only used during the parsing phase; once semantic
  40       analysis has taken place they are eliminated.
  41
  42    2. An expression of the form `x.*p'.  In this case, operand 0 will
  43       be an expression corresponding to `x' and operand 1 will be an
  44       expression with pointer-to-member type.  */
  45 DEFTREECODE (OFFSET_REF, "offset_ref", tcc_reference, 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", tcc_constant, 0)
  51
  52 /* For NEW_EXPR, operand 0 is the placement list.
  53    Operand 1 is the new-declarator.
  54    Operand 2 is the number of elements in the array.
  55    Operand 3 is the initializer.  */
  56 DEFTREECODE (NEW_EXPR, "nw_expr", tcc_expression, 4)
  57 DEFTREECODE (VEC_NEW_EXPR, "vec_nw_expr", tcc_expression, 3)
  58
  59 /* For DELETE_EXPR, operand 0 is the store to be destroyed.
  60    Operand 1 is the value to pass to the destroying function
  61    saying whether the store should be deallocated as well.  */
  62 DEFTREECODE (DELETE_EXPR, "dl_expr", tcc_expression, 2)
  63 DEFTREECODE (VEC_DELETE_EXPR, "vec_dl_expr", tcc_expression, 2)
  64
  65 /* Value is reference to particular overloaded class method.
  66    Operand 0 is the class, operand 1 is the field
  67    The COMPLEXITY field holds the class level (usually 0).  */
  68 DEFTREECODE (SCOPE_REF, "scope_ref", tcc_reference, 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", tcc_reference, 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", tcc_expression, 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", tcc_expression, 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", tcc_expression, 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", tcc_expression, 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", tcc_declaration, 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", tcc_exceptional, 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", tcc_declaration, 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", tcc_exceptional, 0)
 161
 162 /* Index into a template parameter list.  This parameter must be a type.
 163    The type.value field will be a TEMPLATE_PARM_INDEX.  */
 164 DEFTREECODE (TEMPLATE_TYPE_PARM, "template_type_parm", tcc_type, 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", tcc_type, 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",
 180              tcc_type, 0)
 181
 182 /* A type designated by `typename T::t'.  TYPE_CONTEXT is `T',
 183    TYPE_NAME is an IDENTIFIER_NODE for `t'.  If the type was named via
 184    template-id, TYPENAME_TYPE_FULLNAME will hold the TEMPLATE_ID_EXPR.
 185    If TREE_TYPE is present, this type was generated by the implicit
 186    typename extension, and the TREE_TYPE is a _TYPE from a baseclass
 187    of `T'.  */
 188 DEFTREECODE (TYPENAME_TYPE, "typename_type", tcc_type, 0)
 189
 190 /* For template template argument of the form `T::template C'.
 191    TYPE_CONTEXT is `T', the template parameter dependent object.
 192    TYPE_NAME is an IDENTIFIER_NODE for `C', the member class template.  */
 193 DEFTREECODE (UNBOUND_CLASS_TEMPLATE, "unbound_class_template", tcc_type, 0)
 194
 195 /* A type designated by `__typeof (expr)'.  TYPEOF_TYPE_EXPR is the
 196    expression in question.  */
 197 DEFTREECODE (TYPEOF_TYPE, "typeof_type", tcc_type, 0)
 198
 199 /* A using declaration.  DECL_INITIAL contains the specified scope.
 200    This is not an alias, but is later expanded into multiple aliases.
 201    The decl will have a NULL_TYPE iff the scope is a dependent scope,
 202    otherwise it will have a void type.  */
 203 DEFTREECODE (USING_DECL, "using_decl", tcc_declaration, 0)
 204
 205 /* A using directive. The operand is USING_STMT_NAMESPACE.  */
 206 DEFTREECODE (USING_STMT, "using_directive", tcc_expression, 1)
 207
 208 /* An un-parsed default argument.  Looks like an IDENTIFIER_NODE.  */
 209 DEFTREECODE (DEFAULT_ARG, "default_arg", tcc_exceptional, 0)
 210
 211 /* A template-id, like foo<int>.  The first operand is the template.
 212    The second is NULL if there are no explicit arguments, or a
 213    TREE_VEC of arguments.  The template will be a FUNCTION_DECL,
 214    TEMPLATE_DECL, or an OVERLOAD.  If the template-id refers to a
 215    member template, the template may be an IDENTIFIER_NODE.  */
 216 DEFTREECODE (TEMPLATE_ID_EXPR, "template_id_expr", tcc_expression, 2)
 217
 218 /* A list-like node for chaining overloading candidates. TREE_TYPE is
 219    the original name, and the parameter is the FUNCTION_DECL.  */
 220 DEFTREECODE (OVERLOAD, "overload", tcc_exceptional, 0)
 221
 222 /* A whole bunch of tree codes for the initial, superficial parsing of
 223    templates.  */
 224 DEFTREECODE (MODOP_EXPR, "modop_expr", tcc_expression, 3)
 225 DEFTREECODE (CAST_EXPR, "cast_expr", tcc_unary, 1)
 226 DEFTREECODE (REINTERPRET_CAST_EXPR, "reinterpret_cast_expr", tcc_unary, 1)
 227 DEFTREECODE (CONST_CAST_EXPR, "const_cast_expr", tcc_unary, 1)
 228 DEFTREECODE (STATIC_CAST_EXPR, "static_cast_expr", tcc_unary, 1)
 229 DEFTREECODE (DYNAMIC_CAST_EXPR, "dynamic_cast_expr", tcc_unary, 1)
 230 DEFTREECODE (DOTSTAR_EXPR, "dotstar_expr", tcc_expression, 2)
 231 DEFTREECODE (TYPEID_EXPR, "typeid_expr", tcc_expression, 1)
 232 DEFTREECODE (PSEUDO_DTOR_EXPR, "pseudo_dtor_expr", tcc_expression, 3)
 233
 234 /* A placeholder for an expression that is not type-dependent, but
 235    does occur in a template.  When an expression that is not
 236    type-dependent appears in a larger expression, we must compute the
 237    type of that larger expression.  That computation would normally
 238    modify the original expression, which would change the mangling of
 239    that expression if it appeared in a template argument list.  In
 240    that situation, we create a NON_DEPENDENT_EXPR to take the place of
 241    the original expression.  The expression is the only operand -- it
 242    is only needed for diagnostics.  */
 243 DEFTREECODE (NON_DEPENDENT_EXPR, "non_dependent_expr", tcc_expression, 1)
 244
 245 /* CTOR_INITIALIZER is a placeholder in template code for a call to
 246    setup_vtbl_pointer (and appears in all functions, not just ctors).  */
 247 DEFTREECODE (CTOR_INITIALIZER, "ctor_initializer", tcc_expression, 1)
 248
 249 DEFTREECODE (TRY_BLOCK, "try_block", tcc_expression, 2)
 250
 251 DEFTREECODE (EH_SPEC_BLOCK, "eh_spec_block", tcc_expression, 2)
 252
 253 /* A HANDLER wraps a catch handler for the HANDLER_TYPE.  If this is
 254    CATCH_ALL_TYPE, then the handler catches all types.  The declaration of
 255    the catch variable is in HANDLER_PARMS, and the body block in
 256    HANDLER_BODY.  */
 257 DEFTREECODE (HANDLER, "handler", tcc_expression, 2)
 258
 259 /* A MUST_NOT_THROW_EXPR wraps an expression that may not
 260    throw, and must call terminate if it does.  */
 261 DEFTREECODE (MUST_NOT_THROW_EXPR, "must_not_throw_expr", tcc_expression, 1)
 262
 263 /* A CLEANUP_STMT marks the point at which a declaration is fully
 264    constructed.  The CLEANUP_EXPR is run on behalf of CLEANUP_DECL
 265    when CLEANUP_BODY completes.  */
 266 DEFTREECODE (CLEANUP_STMT, "cleanup_stmt", tcc_expression, 3)
 267
 268 /* Represents an 'if' statement. The operands are IF_COND,
 269    THEN_CLAUSE, and ELSE_CLAUSE, respectively.  */
 270 /* ??? It is currently still necessary to distinguish between IF_STMT
 271    and COND_EXPR for the benefit of templates.  */
 272 DEFTREECODE (IF_STMT, "if_stmt", tcc_expression, 3)
 273
 274 DEFTREECODE (TAG_DEFN, "tag_defn", tcc_expression, 0)
 275
 276 /* Template instantiation level node.
 277
 278    TINST_DECL contains the original DECL node.
 279    TINST_LOCATION contains the location where the template is instantiated.
 280
 281    A stack of template instantiation nodes is kept through the TREE_CHAIN
 282    fields of these nodes.  */
 283
 284 DEFTREECODE (TINST_LEVEL, "TINST_LEVEL", tcc_exceptional, 0)
 285
 286 /* Represents an 'offsetof' expression during template expansion.  */
 287 DEFTREECODE (OFFSETOF_EXPR, "offsetof_expr", tcc_expression, 1)
 288
 289 /*
 290 Local variables:
 291 mode:c
 292 End:
 293 */