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, 2005,
   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 for template template parameters.
 163    This parameter must be a type.  The TYPE_FIELDS value will be a
 164    TEMPLATE_PARM_INDEX.
 165
 166    It is used without template arguments like TT in C<TT>,
 167    TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO is NULL_TREE
 168    and TYPE_NAME is a TEMPLATE_DECL.  */
 169 DEFTREECODE (TEMPLATE_TEMPLATE_PARM, "template_template_parm", tcc_type, 0)
 170
 171 /* The ordering of the following codes is optimized for the checking
 172    macros in tree.h.  Changing the order will degrade the speed of the
 173    compiler.  TEMPLATE_TYPE_PARM, TYPENAME_TYPE, TYPEOF_TYPE,
 174    BOUND_TEMPLATE_TEMPLATE_PARM.  */
 175
 176 /* Index into a template parameter list.  This parameter must be a type.
 177    The type.value field will be a TEMPLATE_PARM_INDEX.  */
 178 DEFTREECODE (TEMPLATE_TYPE_PARM, "template_type_parm", tcc_type, 0)
 179
 180 /* A type designated by `typename T::t'.  TYPE_CONTEXT is `T',
 181    TYPE_NAME is an IDENTIFIER_NODE for `t'.  If the type was named via
 182    template-id, TYPENAME_TYPE_FULLNAME will hold the TEMPLATE_ID_EXPR.
 183    TREE_TYPE is always NULL.  */
 184 DEFTREECODE (TYPENAME_TYPE, "typename_type", tcc_type, 0)
 185
 186 /* A type designated by `__typeof (expr)'.  TYPEOF_TYPE_EXPR is the
 187    expression in question.  */
 188 DEFTREECODE (TYPEOF_TYPE, "typeof_type", tcc_type, 0)
 189
 190 /* Like TEMPLATE_TEMPLATE_PARM it is used with bound template arguments
 191    like TT<int>.
 192    In this case, TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO contains the
 193    template name and its bound arguments.  TYPE_NAME is a TYPE_DECL.  */
 194 DEFTREECODE (BOUND_TEMPLATE_TEMPLATE_PARM, "bound_template_template_parm",
 195              tcc_type, 0)
 196
 197 /* For template template argument of the form `T::template C'.
 198    TYPE_CONTEXT is `T', the template parameter dependent object.
 199    TYPE_NAME is an IDENTIFIER_NODE for `C', the member class template.  */
 200 DEFTREECODE (UNBOUND_CLASS_TEMPLATE, "unbound_class_template", tcc_type, 0)
 201
 202 /* A using declaration.  DECL_INITIAL contains the specified scope.
 203    This is not an alias, but is later expanded into multiple aliases.
 204    The decl will have a NULL_TYPE iff the scope is a dependent scope,
 205    otherwise it will have a void type.  */
 206 DEFTREECODE (USING_DECL, "using_decl", tcc_declaration, 0)
 207
 208 /* A using directive. The operand is USING_STMT_NAMESPACE.  */
 209 DEFTREECODE (USING_STMT, "using_directive", tcc_expression, 1)
 210
 211 /* An un-parsed default argument.  Looks like an IDENTIFIER_NODE.  */
 212 DEFTREECODE (DEFAULT_ARG, "default_arg", tcc_exceptional, 0)
 213
 214 /* A template-id, like foo<int>.  The first operand is the template.
 215    The second is NULL if there are no explicit arguments, or a
 216    TREE_VEC of arguments.  The template will be a FUNCTION_DECL,
 217    TEMPLATE_DECL, or an OVERLOAD.  If the template-id refers to a
 218    member template, the template may be an IDENTIFIER_NODE.  */
 219 DEFTREECODE (TEMPLATE_ID_EXPR, "template_id_expr", tcc_expression, 2)
 220
 221 /* A list-like node for chaining overloading candidates. TREE_TYPE is
 222    the original name, and the parameter is the FUNCTION_DECL.  */
 223 DEFTREECODE (OVERLOAD, "overload", tcc_exceptional, 0)
 224
 225 /* A pseudo-destructor, of the form "OBJECT.~DESTRUCTOR" or
 226    "OBJECT.SCOPE::~DESTRUCTOR.  The first operand is the OBJECT.  The
 227    second operand (if non-NULL) is the SCOPE.  The third operand is
 228    the TYPE node corresponding to the DESTRUCTOR.  The type of the
 229    first operand will always be a scalar type.
 230
 231    The type of a PSEUDO_DTOR_EXPR is always "void", even though it can
 232    be used as if it were a zero-argument function.  We handle the
 233    function-call case specially, and giving it "void" type prevents it
 234    being used in expressions in ways that are not permitted.  */
 235 DEFTREECODE (PSEUDO_DTOR_EXPR, "pseudo_dtor_expr", tcc_expression, 3)
 236
 237 /* A whole bunch of tree codes for the initial, superficial parsing of
 238    templates.  */
 239 DEFTREECODE (MODOP_EXPR, "modop_expr", tcc_expression, 3)
 240 DEFTREECODE (CAST_EXPR, "cast_expr", tcc_unary, 1)
 241 DEFTREECODE (REINTERPRET_CAST_EXPR, "reinterpret_cast_expr", tcc_unary, 1)
 242 DEFTREECODE (CONST_CAST_EXPR, "const_cast_expr", tcc_unary, 1)
 243 DEFTREECODE (STATIC_CAST_EXPR, "static_cast_expr", tcc_unary, 1)
 244 DEFTREECODE (DYNAMIC_CAST_EXPR, "dynamic_cast_expr", tcc_unary, 1)
 245 DEFTREECODE (DOTSTAR_EXPR, "dotstar_expr", tcc_expression, 2)
 246 DEFTREECODE (TYPEID_EXPR, "typeid_expr", tcc_expression, 1)
 247
 248 /* A placeholder for an expression that is not type-dependent, but
 249    does occur in a template.  When an expression that is not
 250    type-dependent appears in a larger expression, we must compute the
 251    type of that larger expression.  That computation would normally
 252    modify the original expression, which would change the mangling of
 253    that expression if it appeared in a template argument list.  In
 254    that situation, we create a NON_DEPENDENT_EXPR to take the place of
 255    the original expression.  The expression is the only operand -- it
 256    is only needed for diagnostics.  */
 257 DEFTREECODE (NON_DEPENDENT_EXPR, "non_dependent_expr", tcc_expression, 1)
 258
 259 /* CTOR_INITIALIZER is a placeholder in template code for a call to
 260    setup_vtbl_pointer (and appears in all functions, not just ctors).  */
 261 DEFTREECODE (CTOR_INITIALIZER, "ctor_initializer", tcc_expression, 1)
 262
 263 DEFTREECODE (TRY_BLOCK, "try_block", tcc_expression, 2)
 264
 265 DEFTREECODE (EH_SPEC_BLOCK, "eh_spec_block", tcc_expression, 2)
 266
 267 /* A HANDLER wraps a catch handler for the HANDLER_TYPE.  If this is
 268    CATCH_ALL_TYPE, then the handler catches all types.  The declaration of
 269    the catch variable is in HANDLER_PARMS, and the body block in
 270    HANDLER_BODY.  */
 271 DEFTREECODE (HANDLER, "handler", tcc_expression, 2)
 272
 273 /* A MUST_NOT_THROW_EXPR wraps an expression that may not
 274    throw, and must call terminate if it does.  */
 275 DEFTREECODE (MUST_NOT_THROW_EXPR, "must_not_throw_expr", tcc_expression, 1)
 276
 277 /* A CLEANUP_STMT marks the point at which a declaration is fully
 278    constructed.  The CLEANUP_EXPR is run on behalf of CLEANUP_DECL
 279    when CLEANUP_BODY completes.  */
 280 DEFTREECODE (CLEANUP_STMT, "cleanup_stmt", tcc_expression, 3)
 281
 282 /* Represents an 'if' statement. The operands are IF_COND,
 283    THEN_CLAUSE, and ELSE_CLAUSE, respectively.  */
 284 /* ??? It is currently still necessary to distinguish between IF_STMT
 285    and COND_EXPR for the benefit of templates.  */
 286 DEFTREECODE (IF_STMT, "if_stmt", tcc_expression, 3)
 287
 288 DEFTREECODE (TAG_DEFN, "tag_defn", tcc_expression, 0)
 289
 290 /* Template instantiation level node.
 291
 292    TINST_DECL contains the original DECL node.
 293    TINST_LOCATION contains the location where the template is instantiated.
 294
 295    A stack of template instantiation nodes is kept through the TREE_CHAIN
 296    fields of these nodes.  */
 297
 298 DEFTREECODE (TINST_LEVEL, "TINST_LEVEL", tcc_exceptional, 0)
 299
 300 /* Represents an 'offsetof' expression during template expansion.  */
 301 DEFTREECODE (OFFSETOF_EXPR, "offsetof_expr", tcc_expression, 1)
 302
 303 /*
 304 Local variables:
 305 mode:c
 306 End:
 307 */