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", '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 number of elements in the array.
  55    Operand 3 is the initializer.  */
  56 DEFTREECODE (NEW_EXPR, "nw_expr", 'e', 4)
  57 DEFTREECODE (VEC_NEW_EXPR, "vec_nw_expr", 'e', 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", 'e', 2)
  63 DEFTREECODE (VEC_DELETE_EXPR, "vec_dl_expr", 'e', 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", '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.value field 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)'.  TYPEOF_TYPE_EXPR 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    The decl will have a NULL_TYPE iff the scope is a dependent scope,
 201    otherwise it will have a void type.  */
 202 DEFTREECODE (USING_DECL, "using_decl", 'd', 0)
 203
 204 /* A using directive. The operand is USING_STMT_NAMESPACE.  */
 205 DEFTREECODE (USING_STMT, "using_directive", 'e', 1)
 206
 207 /* An un-parsed default argument.  Looks like an IDENTIFIER_NODE.  */
 208 DEFTREECODE (DEFAULT_ARG, "default_arg", 'x', 0)
 209
 210 /* A template-id, like foo<int>.  The first operand is the template.
 211    The second is NULL if there are no explicit arguments, or a
 212    TREE_VEC of arguments.  The template will be a FUNCTION_DECL,
 213    TEMPLATE_DECL, or an OVERLOAD.  If the template-id refers to a
 214    member template, the template may be an IDENTIFIER_NODE.  */
 215 DEFTREECODE (TEMPLATE_ID_EXPR, "template_id_expr", 'e', 2)
 216
 217 /* A list-like node for chaining overloading candidates. TREE_TYPE is
 218    the original name, and the parameter is the FUNCTION_DECL.  */
 219 DEFTREECODE (OVERLOAD, "overload", 'x', 0)
 220
 221 /* A whole bunch of tree codes for the initial, superficial parsing of
 222    templates.  */
 223 DEFTREECODE (MODOP_EXPR, "modop_expr", 'e', 3)
 224 DEFTREECODE (CAST_EXPR, "cast_expr", '1', 1)
 225 DEFTREECODE (REINTERPRET_CAST_EXPR, "reinterpret_cast_expr", '1', 1)
 226 DEFTREECODE (CONST_CAST_EXPR, "const_cast_expr", '1', 1)
 227 DEFTREECODE (STATIC_CAST_EXPR, "static_cast_expr", '1', 1)
 228 DEFTREECODE (DYNAMIC_CAST_EXPR, "dynamic_cast_expr", '1', 1)
 229 DEFTREECODE (DOTSTAR_EXPR, "dotstar_expr", 'e', 2)
 230 DEFTREECODE (TYPEID_EXPR, "typeid_expr", 'e', 1)
 231 DEFTREECODE (PSEUDO_DTOR_EXPR, "pseudo_dtor_expr", 'e', 3)
 232
 233 /* A placeholder for an expression that is not type-dependent, but
 234    does occur in a template.  When an expression that is not
 235    type-dependent appears in a larger expression, we must compute the
 236    type of that larger expression.  That computation would normally
 237    modify the original expression, which would change the mangling of
 238    that expression if it appeared in a template argument list.  In
 239    that situation, we create a NON_DEPENDENT_EXPR to take the place of
 240    the original expression.  The expression is the only operand -- it
 241    is only needed for diagnostics.  */
 242 DEFTREECODE (NON_DEPENDENT_EXPR, "non_dependent_expr", 'e', 1)
 243
 244 /* CTOR_INITIALIZER is a placeholder in template code for a call to
 245    setup_vtbl_pointer (and appears in all functions, not just ctors).  */
 246 DEFTREECODE (CTOR_INITIALIZER, "ctor_initializer", 'e', 1)
 247
 248 DEFTREECODE (TRY_BLOCK, "try_block", 'e', 2)
 249
 250 DEFTREECODE (EH_SPEC_BLOCK, "eh_spec_block", 'e', 2)
 251
 252 /* A HANDLER wraps a catch handler for the HANDLER_TYPE.  If this is
 253    CATCH_ALL_TYPE, then the handler catches all types.  The declaration of
 254    the catch variable is in HANDLER_PARMS, and the body block in
 255    HANDLER_BODY.  */
 256 DEFTREECODE (HANDLER, "handler", 'e', 2)
 257
 258 /* A MUST_NOT_THROW_EXPR wraps an expression that may not
 259    throw, and must call terminate if it does.  */
 260 DEFTREECODE (MUST_NOT_THROW_EXPR, "must_not_throw_expr", 'e', 1)
 261
 262 /* A CLEANUP_STMT marks the point at which a declaration is fully
 263    constructed.  The CLEANUP_EXPR is run on behalf of CLEANUP_DECL
 264    when CLEANUP_BODY completes.  */
 265 DEFTREECODE (CLEANUP_STMT, "cleanup_stmt", 'e', 3)
 266
 267 /* Represents an 'if' statement. The operands are IF_COND,
 268    THEN_CLAUSE, and ELSE_CLAUSE, respectively.  */
 269 /* ??? It is currently still necessary to distinguish between IF_STMT
 270    and COND_EXPR for the benefit of templates.  */
 271 DEFTREECODE (IF_STMT, "if_stmt", 'e', 3)
 272
 273 DEFTREECODE (TAG_DEFN, "tag_defn", 'e', 0)
 274
 275 /* Template instantiation level node.
 276
 277    TINST_DECL contains the original DECL node.
 278    TINST_LOCATION contains the location where the template is instantiated.
 279
 280    A stack of template instantiation nodes is kept through the TREE_CHAIN
 281    fields of these nodes.  */
 282
 283 DEFTREECODE (TINST_LEVEL, "TINST_LEVEL", 'x', 0)
 284
 285 /*
 286 Local variables:
 287 mode:c
 288 End:
 289 */