tree.def

gcc库的原代码,对编程有很大帮助.

/* This file contains the definitions and documentation for the
   additional tree codes used in the GNU C++ compiler (see tree.def
   for the standard codes).
   Copyright (C) 1987, 1988, 1990, 1993 Free Software Foundation, Inc.
   Hacked by Michael Tiemann ([e-mail])

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

 
/* Reference to the contents of an offset
   (a value whose type is an OFFSET_TYPE).
   Operand 0 is the object within which the offset is taken.
   Operand 1 is the offset.  The language independent OFFSET_REF
   just won't work for us.  */
DEFTREECODE (CP_OFFSET_REF, "cp_offset_ref", "r", 2)

/* For DELETE_EXPR, operand 0 is the store to be destroyed.
   Operand 1 is the value to pass to the destroying function
   saying whether the store should be deallocated as well.  */
DEFTREECODE (DELETE_EXPR, "dl_expr", "e", 2)
DEFTREECODE (VEC_DELETE_EXPR, "vec_dl_expr", "e", 2)

/* For a UNSAVE_EXPR, operand 0 is the value to unsave.  By unsave, we
   mean that all _EXPRs such as TARGET_EXPRs, SAVE_EXPRs,
   WITH_CLEANUP_EXPRs, CALL_EXPRs and RTL_EXPRs, that are protected
   from being evaluated more than once should be reset so that a new
   expand_expr call of this expr will cause those to be re-evaluated.
   This is useful when we want to reuse a tree in different places,
   but where we must re-expand.  */
DEFTREECODE (UNSAVE_EXPR, "unsave_expr", "e", 1)

/* Value is reference to particular overloaded class method.
   Operand 0 is the class name (an IDENTIFIER_NODE);
   operand 1 is the field (also an IDENTIFIER_NODE).
   The COMPLEXITY field holds the class level (usually 0).  */
DEFTREECODE (SCOPE_REF, "scope_ref", "r", 2)

/* When composing an object with a member, this is the result.
   Operand 0 is the object.  Operand 1 is the member (usually
   a dereferenced pointer to member).  */
DEFTREECODE (MEMBER_REF, "member_ref", "r", 2)

/* Type conversion operator in C++.  TREE_TYPE is type that this
   operator converts to.  Operand is expression to be converted.  */
DEFTREECODE (TYPE_EXPR, "type_expr", "e", 1)

/* For CPLUS_NEW_EXPR, operand 0 is function which performs initialization,
   operand 1 is argument list to initialization function,
   and operand 2 is the slot which was allocated for this expression.  */
DEFTREECODE (NEW_EXPR, "nw_expr", "e", 3)
DEFTREECODE (VEC_NEW_EXPR, "vec_nw_expr", "e", 3)

/* A throw expression.  operand 0 is the expression, if there was one,
   else it is NULL_TREE.  */
DEFTREECODE (THROW_EXPR, "throw_expr", "e", 1)

/* Template definition.  The following fields have the specified uses,
   although there are other macros in cp-tree.h that should be used for
   accessing this data.
        DECL_ARGUMENTS          template parm vector
        DECL_TEMPLATE_INFO      template text &c
	DECL_VINDEX		list of instantiations already produced;
				only done for functions so far
   For class template:
        DECL_INITIAL            associated templates (methods &c)
        DECL_RESULT             null
   For non-class templates:
	TREE_TYPE		type of object to be constructed
        DECL_RESULT             decl for object to be created
                                (e.g., FUNCTION_DECL with tmpl parms used)
 */
DEFTREECODE (TEMPLATE_DECL, "template_decl", "d", 0)

/* Index into a template parameter list.  This parameter must be a type.
   Use TYPE_FIELDS to find parmlist and index.  */
DEFTREECODE (TEMPLATE_TYPE_PARM, "template_type_parm", "t", 0)

/* Index into a template parameter list.  This parameter must not be a
   type.  */
DEFTREECODE (TEMPLATE_CONST_PARM, "template_const_parm", "c", 2)

/* For uninstantiated parameterized types.
        TYPE_VALUES     tree list:
                TREE_PURPOSE    template decl
                TREE_VALUE      parm vector
                TREE_CHAIN      null
   Other useful fields to be defined later.  */
DEFTREECODE (UNINSTANTIATED_P_TYPE, "uninstantiated_p_type", "t", 0)

/* A thunk is a stub function.

   Thunks are used to implement multiple inheritance:
   At run-time, such a thunk subtracts THUNK_DELTA (an int, not a tree)
   from the this pointer, and then jumps to DECL_INITIAL
   (which is an ADDR_EXPR whose operand is a FUNCTION_DECL).

   Other kinds of thunks may be defined later. */
DEFTREECODE (THUNK_DECL, "thunk_decl", "d", 0)

/* A namespace declaration.  */
DEFTREECODE (NAMESPACE_DECL, "namespace_decl", "d", 0)