// Methods for type_info for -*- C++ -*- Run Time Type Identification.
-// Copyright (C) 1994, 1996, 1998, 1999, 2000 Free Software Foundation
-
-// This file is part of GNU CC.
-
-// GNU CC is free software; you can redistribute it and/or modify
+// Copyright (C) 1994, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004
+// Free Software Foundation
+//
+// This file is part of GCC.
+//
+// GCC 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,
+// GCC 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.
+// along with GCC; see the file COPYING. If not, write to
+// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+// Boston, MA 02110-1301, USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
-#pragma implementation "typeinfo"
-
-#include <stddef.h>
+#include <bits/c++config.h>
+#include <cstddef>
#include "tinfo.h"
#include "new" // for placement new
~type_info ()
{ }
-#if !defined(__GXX_ABI_VERSION) || __GXX_ABI_VERSION < 100
-// original (old) abi
-
-namespace
-{
-// ADDR is a pointer to an object. Convert it to a pointer to a base,
-// using OFFSET.
-inline void*
-convert_to_base (void *addr, bool is_virtual, myint32 offset)
-{
- if (!addr)
- return NULL;
-
- if (!is_virtual)
- return (char *) addr + offset;
+std::bad_cast::~bad_cast() throw() { }
+std::bad_typeid::~bad_typeid() throw() { }
- // Under the old ABI, the offset gives us the address of a pointer
- // to the virtual base.
- return *((void **) ((char *) addr + offset));
-}
-
-}
+#if !__GXX_MERGED_TYPEINFO_NAMES
// We can't rely on common symbols being shared between shared objects.
bool std::type_info::
return (&arg == this) || (__builtin_strcmp (name (), arg.name ()) == 0);
}
-extern "C" void
-__rtti_class (void *addr, const char *name,
- const __class_type_info::base_info *bl, size_t bn)
-{ new (addr) __class_type_info (name, bl, bn); }
-
-extern "C" void
-__rtti_si (void *addr, const char *n, const std::type_info *ti)
-{
- new (addr) __si_type_info
- (n, static_cast <const __user_type_info &> (*ti));
-}
-
-extern "C" void
-__rtti_user (void *addr, const char *name)
-{ new (addr) __user_type_info (name); }
-
-// Upcast for catch checking. OBJPTR points to the thrown object and might be
-// NULL. Return 0 on failure, non-zero on success. Set *ADJPTR to adjusted
-// object pointer.
-int __user_type_info::
-upcast (const type_info &target, void *objptr,
- void **adjptr) const
-{
- upcast_result result;
-
- if (do_upcast (contained_public, target, objptr, result))
- return 0;
- *adjptr = result.target_obj;
- return contained_public_p (result.whole2target);
-}
-
-// Down or cross cast for dynamic_cast. OBJPTR points to the most derrived
-// object, SUBPTR points to the static base object. Both must not be NULL.
-// TARGET specifies the desired target type, SUBTYPE specifies the static
-// type. Both must be defined. Returns adjusted object pointer on success,
-// NULL on failure. [expr.dynamic.cast]/8 says 'unambiguous public base'. This
-// itself is an ambiguous statement. We choose it to mean the base must be
-// separately unambiguous and public, rather than unambiguous considering only
-// public bases.
-void *__user_type_info::
-dyncast (int boff,
- const type_info &target, void *objptr,
- const type_info &subtype, void *subptr) const
-{
- dyncast_result result;
-
- do_dyncast (boff, contained_public,
- target, objptr, subtype, subptr, result);
- if (!result.target_obj)
- return NULL;
- if (contained_public_p (result.target2sub))
- return result.target_obj;
- if (contained_public_p (sub_kind (result.whole2sub & result.whole2target)))
- // Found a valid cross cast
- return result.target_obj;
- if (contained_nonvirtual_p (result.whole2sub))
- // Found an invalid cross cast, which cannot also be a down cast
- return NULL;
- if (result.target2sub == unknown)
- result.target2sub = static_cast <const __user_type_info &> (target)
- .find_public_subobj (boff, subtype,
- result.target_obj, subptr);
- if (contained_public_p (result.target2sub))
- // Found a valid down cast
- return result.target_obj;
- // Must be an invalid down cast, or the cross cast wasn't bettered
- return NULL;
-}
-
-// Catch cast helper. ACCESS_PATH is the access from the complete thrown
-// object to this base. TARGET is the desired type we want to catch. OBJPTR
-// points to this base within the throw object, it might be NULL. Fill in
-// RESULT with what we find. Return true, should we determine catch must fail.
-bool __user_type_info::
-do_upcast (sub_kind access_path,
- const type_info &target, void *objptr,
- upcast_result &__restrict result) const
-{
- if (*this == target)
- {
- result.target_obj = objptr;
- result.base_type = nonvirtual_base_type;
- result.whole2target = access_path;
- return contained_nonpublic_p (access_path);
- }
- return false;
-}
-
-// dynamic cast helper. ACCESS_PATH gives the access from the most derived
-// object to this base. TARGET indicates the desired type we want. OBJPTR
-// points to this base within the object. SUBTYPE indicates the static type
-// started from and SUBPTR points to that base within the most derived object.
-// Fill in RESULT with what we find. Return true if we have located an
-// ambiguous match.
-bool __user_type_info::
-do_dyncast (int, sub_kind access_path,
- const type_info &target, void *objptr,
- const type_info &subtype, void *subptr,
- dyncast_result &__restrict result) const
-{
- if (objptr == subptr && *this == subtype)
- {
- // The subobject we started from. Indicate how we are accessible from
- // the most derived object.
- result.whole2sub = access_path;
- return false;
- }
- if (*this == target)
- {
- result.target_obj = objptr;
- result.whole2target = access_path;
- result.target2sub = not_contained;
- return false;
- }
- return false;
-}
-
-// find_public_subobj helper. Return contained_public if we are the desired
-// subtype. OBJPTR points to this base type, SUBPTR points to the desired base
-// object.
-__user_type_info::sub_kind __user_type_info::
-do_find_public_subobj (int, const type_info &, void *objptr, void *subptr) const
-{
- if (subptr == objptr)
- // Must be our type, as the pointers match.
- return contained_public;
- return not_contained;
-}
-
-// catch helper for single public inheritance types. See
-// __user_type_info::do_upcast for semantics.
-bool __si_type_info::
-do_upcast (sub_kind access_path,
- const type_info &target, void *objptr,
- upcast_result &__restrict result) const
-{
- if (*this == target)
- {
- result.target_obj = objptr;
- result.base_type = nonvirtual_base_type;
- result.whole2target = access_path;
- return contained_nonpublic_p (access_path);
- }
- return base.do_upcast (access_path, target, objptr, result);
-}
-
-// dynamic cast helper for single public inheritance types. See
-// __user_type_info::do_dyncast for semantics. BOFF indicates how SUBTYPE
-// types are inherited by TARGET types.
-bool __si_type_info::
-do_dyncast (int boff, sub_kind access_path,
- const type_info &target, void *objptr,
- const type_info &subtype, void *subptr,
- dyncast_result &__restrict result) const
-{
- if (objptr == subptr && *this == subtype)
- {
- // The subobject we started from. Indicate how we are accessible from
- // the most derived object.
- result.whole2sub = access_path;
- return false;
- }
- if (*this == target)
- {
- result.target_obj = objptr;
- result.whole2target = access_path;
- if (boff >= 0)
- result.target2sub = ((char *)subptr - (char *)objptr) == boff
- ? contained_public : not_contained;
- else if (boff == -2)
- result.target2sub = not_contained;
- return false;
- }
- return base.do_dyncast (boff, access_path,
- target, objptr, subtype, subptr, result);
-}
-
-// find_public_subobj helper. See __user_type_info::do_find_public_subobj or
-// semantics. BOFF indicates how SUBTYPE types are inherited by the original
-// target object.
-__user_type_info::sub_kind __si_type_info::
-do_find_public_subobj (int boff, const type_info &subtype, void *objptr, void *subptr) const
-{
- if (subptr == objptr && subtype == *this)
- return contained_public;
- return base.do_find_public_subobj (boff, subtype, objptr, subptr);
-}
-
-// catch helper for multiple or non-public inheritance types. See
-// __user_type_info::do_upcast for semantics.
-bool __class_type_info::
-do_upcast (sub_kind access_path,
- const type_info &target, void *objptr,
- upcast_result &__restrict result) const
-{
- if (*this == target)
- {
- result.target_obj = objptr;
- result.base_type = nonvirtual_base_type;
- result.whole2target = access_path;
- return contained_nonpublic_p (access_path);
- }
-
- for (size_t i = n_bases; i--;)
- {
- upcast_result result2;
- void *p = objptr;
- sub_kind sub_access = access_path;
- p = convert_to_base (p,
- base_list[i].is_virtual,
- base_list[i].offset);
- if (base_list[i].is_virtual)
- sub_access = sub_kind (sub_access | contained_virtual_mask);
- if (base_list[i].access != PUBLIC)
- sub_access = sub_kind (sub_access & ~contained_public_mask);
- if (base_list[i].base->do_upcast (sub_access, target, p, result2)
- && !contained_virtual_p (result2.whole2target))
- return true; // must fail
- if (result2.base_type)
- {
- if (result2.base_type == nonvirtual_base_type
- && base_list[i].is_virtual)
- result2.base_type = base_list[i].base;
- if (!result.base_type)
- result = result2;
- else if (result.target_obj != result2.target_obj)
- {
- // Found an ambiguity.
- result.target_obj = NULL;
- result.whole2target = contained_ambig;
- return true;
- }
- else if (result.target_obj)
- {
- // Ok, found real object via a virtual path.
- result.whole2target
- = sub_kind (result.whole2target | result2.whole2target);
- }
- else
- {
- // Dealing with a null pointer, need to check vbase
- // containing each of the two choices.
- if (result2.base_type == nonvirtual_base_type
- || result.base_type == nonvirtual_base_type
- || !(*result2.base_type == *result.base_type))
- {
- // Already ambiguous, not virtual or via different virtuals.
- // Cannot match.
- result.whole2target = contained_ambig;
- return true;
- }
- result.whole2target
- = sub_kind (result.whole2target | result2.whole2target);
- }
- }
- }
- return false;
-}
-
-// dynamic cast helper for non-public or multiple inheritance types. See
-// __user_type_info::do_dyncast for overall semantics.
-// This is a big hairy function. Although the run-time behaviour of
-// dynamic_cast is simple to describe, it gives rise to some non-obvious
-// behaviour. We also desire to determine as early as possible any definite
-// answer we can get. Because it is unknown what the run-time ratio of
-// succeeding to failing dynamic casts is, we do not know in which direction
-// to bias any optimizations. To that end we make no particular effort towards
-// early fail answers or early success answers. Instead we try to minimize
-// work by filling in things lazily (when we know we need the information),
-// and opportunisticly take early success or failure results.
-bool __class_type_info::
-do_dyncast (int boff, sub_kind access_path,
- const type_info &target, void *objptr,
- const type_info &subtype, void *subptr,
- dyncast_result &__restrict result) const
-{
- if (objptr == subptr && *this == subtype)
- {
- // The subobject we started from. Indicate how we are accessible from
- // the most derived object.
- result.whole2sub = access_path;
- return false;
- }
- if (*this == target)
- {
- result.target_obj = objptr;
- result.whole2target = access_path;
- if (boff >= 0)
- result.target2sub = ((char *)subptr - (char *)objptr) == boff
- ? contained_public : not_contained;
- else if (boff == -2)
- result.target2sub = not_contained;
- return false;
- }
- bool result_ambig = false;
- for (size_t i = n_bases; i--;)
- {
- dyncast_result result2;
- void *p;
- sub_kind sub_access = access_path;
- p = convert_to_base (objptr,
- base_list[i].is_virtual,
- base_list[i].offset);
- if (base_list[i].is_virtual)
- sub_access = sub_kind (sub_access | contained_virtual_mask);
- if (base_list[i].access != PUBLIC)
- sub_access = sub_kind (sub_access & ~contained_public_mask);
-
- bool result2_ambig
- = base_list[i].base->do_dyncast (boff, sub_access,
- target, p, subtype, subptr, result2);
- result.whole2sub = sub_kind (result.whole2sub | result2.whole2sub);
- if (result2.target2sub == contained_public
- || result2.target2sub == contained_ambig)
- {
- result.target_obj = result2.target_obj;
- result.whole2target = result2.whole2target;
- result.target2sub = result2.target2sub;
- // Found a downcast which can't be bettered or an ambiguous downcast
- // which can't be disambiguated
- return result2_ambig;
- }
-
- if (!result_ambig && !result.target_obj)
- {
- // Not found anything yet.
- result.target_obj = result2.target_obj;
- result.whole2target = result2.whole2target;
- result_ambig = result2_ambig;
- }
- else if (result.target_obj && result.target_obj == result2.target_obj)
- {
- // Found at same address, must be via virtual. Pick the most
- // accessible path.
- result.whole2target =
- sub_kind (result.whole2target | result2.whole2target);
- }
- else if ((result.target_obj && result2.target_obj)
- || (result_ambig && result2.target_obj)
- || (result2_ambig && result.target_obj))
- {
- // Found two different TARGET bases, or a valid one and a set of
- // ambiguous ones, must disambiguate. See whether SUBOBJ is
- // contained publicly within one of the non-ambiguous choices.
- // If it is in only one, then that's the choice. If it is in
- // both, then we're ambiguous and fail. If it is in neither,
- // we're ambiguous, but don't yet fail as we might later find a
- // third base which does contain SUBPTR.
-
- sub_kind new_sub_kind = result2.target2sub;
- sub_kind old_sub_kind = result.target2sub;
-
- if (contained_nonvirtual_p (result.whole2sub))
- {
- // We already found SUBOBJ as a non-virtual base of most
- // derived. Therefore if it is in either choice, it can only be
- // in one of them, and we will already know.
- if (old_sub_kind == unknown)
- old_sub_kind = not_contained;
- if (new_sub_kind == unknown)
- new_sub_kind = not_contained;
- }
- else
- {
- const __user_type_info &t =
- static_cast <const __user_type_info &> (target);
-
- if (old_sub_kind >= not_contained)
- ;// already calculated
- else if (contained_nonvirtual_p (new_sub_kind))
- // Already found non-virtually inside the other choice,
- // cannot be in this.
- old_sub_kind = not_contained;
- else
- old_sub_kind = t.find_public_subobj (boff, subtype,
- result.target_obj, subptr);
-
- if (new_sub_kind >= not_contained)
- ;// already calculated
- else if (contained_nonvirtual_p (old_sub_kind))
- // Already found non-virtually inside the other choice,
- // cannot be in this.
- new_sub_kind = not_contained;
- else
- new_sub_kind = t.find_public_subobj (boff, subtype,
- result2.target_obj, subptr);
- }
-
- // Neither sub_kind can be contained_ambig -- we bail out early
- // when we find those.
- if (contained_p (sub_kind (new_sub_kind ^ old_sub_kind)))
- {
- // Only on one choice, not ambiguous.
- if (contained_p (new_sub_kind))
- {
- // Only in new.
- result.target_obj = result2.target_obj;
- result.whole2target = result2.whole2target;
- result_ambig = false;
- old_sub_kind = new_sub_kind;
- }
- result.target2sub = old_sub_kind;
- if (result.target2sub == contained_public)
- return false; // Can't be an ambiguating downcast for later discovery.
- }
- else if (contained_p (sub_kind (new_sub_kind & old_sub_kind)))
- {
- // In both.
- result.target_obj = NULL;
- result.target2sub = contained_ambig;
- return true; // Fail.
- }
- else
- {
- // In neither publicly, ambiguous for the moment, but keep
- // looking. It is possible that it was private in one or
- // both and therefore we should fail, but that's just tough.
- result.target_obj = NULL;
- result.target2sub = not_contained;
- result_ambig = true;
- }
- }
-
- if (result.whole2sub == contained_private)
- // We found SUBOBJ as a private non-virtual base, therefore all
- // cross casts will fail. We have already found a down cast, if
- // there is one.
- return result_ambig;
- }
-
- return result_ambig;
-}
-
-// find_public_subobj helper for non-public or multiple inheritance types. See
-// __user_type_info::do_find_public_subobj for semantics. We make use of BOFF
-// to prune the base class walk.
-__user_type_info::sub_kind __class_type_info::
-do_find_public_subobj (int boff, const type_info &subtype, void *objptr, void *subptr) const
-{
- if (objptr == subptr && subtype == *this)
- return contained_public;
-
- for (size_t i = n_bases; i--;)
- {
- if (base_list[i].access != PUBLIC)
- continue; // Not public, can't be here.
- void *p;
-
- if (base_list[i].is_virtual && boff == -3)
- // Not a virtual base, so can't be here.
- continue;
-
- p = convert_to_base (objptr,
- base_list[i].is_virtual,
- base_list[i].offset);
-
- sub_kind base_kind = base_list[i].base->do_find_public_subobj
- (boff, subtype, p, subptr);
- if (contained_p (base_kind))
- {
- if (base_list[i].is_virtual)
- base_kind = sub_kind (base_kind | contained_virtual_mask);
- return base_kind;
- }
- }
-
- return not_contained;
-}
-#else
-// new abi
+#endif
namespace std {
return false;
}
-};
+}
namespace {
using namespace std;
using namespace abi;
-// initial part of a vtable, this structure is used with offsetof, so we don't
+// Initial part of a vtable, this structure is used with offsetof, so we don't
// have to keep alignments consistent manually.
-struct vtable_prefix {
- ptrdiff_t whole_object; // offset to most derived object
- const __class_type_info *whole_type; // pointer to most derived type_info
- const void *origin; // what a class's vptr points to
+struct vtable_prefix
+{
+ // Offset to most derived object.
+ ptrdiff_t whole_object;
+
+ // Additional padding if necessary.
+#ifdef _GLIBCXX_VTABLE_PADDING
+ ptrdiff_t padding1;
+#endif
+
+ // Pointer to most derived type_info.
+ const __class_type_info *whole_type;
+
+ // Additional padding if necessary.
+#ifdef _GLIBCXX_VTABLE_PADDING
+ ptrdiff_t padding2;
+#endif
+
+ // What a class's vptr points to.
+ const void *origin;
};
template <typename T>
static const __class_type_info *const nonvirtual_base_type =
static_cast <const __class_type_info *> (0) + 1;
-}; // namespace
+} // namespace
namespace __cxxabiv1
{
{}
// __upcast_result is used to hold information during traversal of a class
-// heirarchy when catch matching.
+// hierarchy when catch matching.
struct __class_type_info::__upcast_result
{
const void *dst_ptr; // pointer to caught object
__sub_kind part2dst; // path from current base to target
- int src_details; // hints about the source type heirarchy
+ int src_details; // hints about the source type hierarchy
const __class_type_info *base_type; // where we found the target,
// if in vbase the __class_type_info of vbase
// if a non-virtual base then 1
// else NULL
- public:
__upcast_result (int d)
:dst_ptr (NULL), part2dst (__unknown), src_details (d), base_type (NULL)
{}
};
// __dyncast_result is used to hold information during traversal of a class
-// heirarchy when dynamic casting.
+// hierarchy when dynamic casting.
struct __class_type_info::__dyncast_result
{
const void *dst_ptr; // pointer to target object or NULL
__sub_kind whole2dst; // path from most derived object to target
__sub_kind whole2src; // path from most derived object to sub object
__sub_kind dst2src; // path from target to sub object
- int whole_details; // details of the whole class heirarchy
+ int whole_details; // details of the whole class hierarchy
- public:
__dyncast_result (int details_ = __vmi_class_type_info::__flags_unknown_mask)
:dst_ptr (NULL), whole2dst (__unknown),
whole2src (__unknown), dst2src (__unknown),
whole_details (details_)
{}
+
+protected:
+ __dyncast_result(const __dyncast_result&);
+
+ __dyncast_result&
+ operator=(const __dyncast_result&);
};
bool __class_type_info::
if (obj_ptr == src_ptr && *this == *src_type)
return __contained_public;
- for (size_t i = __base_count; i--;)
+ for (std::size_t i = __base_count; i--;)
{
if (!__base_info[i].__is_public_p ())
continue; // Not public, can't be here.
}
base = convert_to_base (base, is_virtual, offset);
- __sub_kind base_kind = __base_info[i].__base->__do_find_public_src
+ __sub_kind base_kind = __base_info[i].__base_type->__do_find_public_src
(src2dst, base, src_type, src_ptr);
if (contained_p (base_kind))
{
}
bool result_ambig = false;
- for (size_t i = __base_count; i--;)
+ for (std::size_t i = __base_count; i--;)
{
__dyncast_result result2 (result.whole_details);
void const *base = obj_ptr;
}
bool result2_ambig
- = __base_info[i].__base->__do_dyncast (src2dst, base_access,
+ = __base_info[i].__base_type->__do_dyncast (src2dst, base_access,
dst_type, base,
src_type, src_ptr, result2);
result.whole2src = __sub_kind (result.whole2src | result2.whole2src);
result.whole2dst =
__sub_kind (result.whole2dst | result2.whole2dst);
}
- else if ((result.dst_ptr != 0 | result_ambig)
- && (result2.dst_ptr != 0 | result2_ambig))
+ else if ((result.dst_ptr != 0 & result2.dst_ptr != 0)
+ || (result.dst_ptr != 0 & result2_ambig)
+ || (result2.dst_ptr != 0 & result_ambig))
{
// Found two different DST_TYPE bases, or a valid one and a set of
// ambiguous ones, must disambiguate. See whether SRC_PTR is
|| !(result.whole_details & __diamond_shaped_mask)))
{
// We already found SRC_PTR as a base of most derived, and
- // either it was non-virtual, or the whole heirarchy is
+ // either it was non-virtual, or the whole hierarchy is
// not-diamond shaped. Therefore if it is in either choice, it
// can only be in one of them, and we will already know.
if (old_sub_kind == __unknown)
if (src_details & __flags_unknown_mask)
src_details = __flags;
- for (size_t i = __base_count; i--;)
+ for (std::size_t i = __base_count; i--;)
{
__upcast_result result2 (src_details);
const void *base = obj_ptr;
if (base)
base = convert_to_base (base, is_virtual, offset);
- if (__base_info[i].__base->__do_upcast (dst, base, result2))
+ if (__base_info[i].__base_type->__do_upcast (dst, base, result2))
{
if (result2.base_type == nonvirtual_base_type && is_virtual)
- result2.base_type = __base_info[i].__base;
+ result2.base_type = __base_info[i].__base_type;
if (contained_p (result2.part2dst) && !is_public)
result2.part2dst = __sub_kind (result2.part2dst & ~__contained_public_mask);
return NULL;
}
-}; // namespace __cxxabiv1
-#endif
+} // namespace __cxxabiv1
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