gcc/libstdc++-v3/libsupc++/tinfo2.cc

453 lines
12 KiB
C++

// Methods for type_info for -*- C++ -*- Run Time Type Identification.
// Copyright (C) 1994, 1996, 1997, 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
// 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.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
#include <cstddef>
#include "tinfo.h"
#include "new" // for placement new
// We can't rely on having stdlib.h if we're freestanding.
extern "C" void abort ();
using std::type_info;
#if !defined(__GXX_ABI_VERSION) || __GXX_ABI_VERSION < 100
bool
type_info::before (const type_info &arg) const
{
return __builtin_strcmp (name (), arg.name ()) < 0;
}
// type info for pointer type.
struct __pointer_type_info : public type_info {
const type_info& type;
__pointer_type_info (const char *n, const type_info& ti)
: type_info (n), type (ti) {}
};
// type info for attributes
struct __attr_type_info : public type_info {
enum cv { NONE = 0, CONST = 1, VOLATILE = 2, CONSTVOL = 1 | 2 };
const type_info& type;
cv attr;
__attr_type_info (const char *n, cv a, const type_info& t)
: type_info (n), type (t), attr (a) {}
};
// type_info for builtin type
struct __builtin_type_info : public type_info {
__builtin_type_info (const char *n): type_info (n) {}
};
// type info for function.
struct __func_type_info : public type_info {
__func_type_info (const char *n) : type_info (n) {}
};
// type info for pointer to member function.
struct __ptmf_type_info : public type_info {
__ptmf_type_info (const char *n) : type_info (n) {}
};
// type info for pointer to data member.
struct __ptmd_type_info : public type_info {
__ptmd_type_info (const char *n): type_info (n) {}
};
// type info for array.
struct __array_type_info : public type_info {
__array_type_info (const char *n): type_info (n) {}
};
#else
#include <cxxabi.h>
#endif
#if defined(__GXX_ABI_VERSION) && __GXX_ABI_VERSION >= 100
namespace __cxxabiv1 {
using namespace std;
// This has special meaning to the compiler, and will cause it
// to emit the type_info structures for the fundamental types which are
// mandated to exist in the runtime.
__fundamental_type_info::
~__fundamental_type_info ()
{}
__array_type_info::
~__array_type_info ()
{}
__function_type_info::
~__function_type_info ()
{}
__enum_type_info::
~__enum_type_info ()
{}
__pbase_type_info::
~__pbase_type_info ()
{}
__pointer_type_info::
~__pointer_type_info ()
{}
__pointer_to_member_type_info::
~__pointer_to_member_type_info ()
{}
bool __pointer_type_info::
__is_pointer_p () const
{
return true;
}
bool __function_type_info::
__is_function_p () const
{
return true;
}
bool __pbase_type_info::
__do_catch (const type_info *thr_type,
void **thr_obj,
unsigned outer) const
{
if (*this == *thr_type)
return true; // same type
if (typeid (*this) != typeid (*thr_type))
return false; // not both same kind of pointers
if (!(outer & 1))
// We're not the same and our outer pointers are not all const qualified
// Therefore there must at least be a qualification conversion involved
// But for that to be valid, our outer pointers must be const qualified.
return false;
const __pbase_type_info *thrown_type =
static_cast <const __pbase_type_info *> (thr_type);
if (thrown_type->__qualifier_flags & ~__qualifier_flags)
// We're less qualified.
return false;
if (!(__qualifier_flags & __const_mask))
outer &= ~1;
return __pointer_catch (thrown_type, thr_obj, outer);
}
inline bool __pbase_type_info::
__pointer_catch (const __pbase_type_info *thrown_type,
void **thr_obj,
unsigned outer) const
{
return __pointee->__do_catch (thrown_type->__pointee, thr_obj, outer + 2);
}
bool __pointer_type_info::
__pointer_catch (const __pbase_type_info *thrown_type,
void **thr_obj,
unsigned outer) const
{
if (outer < 2 && *__pointee == typeid (void))
{
// conversion to void
return !thrown_type->__pointee->__is_function_p ();
}
return __pbase_type_info::__pointer_catch (thrown_type, thr_obj, outer);
}
bool __pointer_to_member_type_info::
__pointer_catch (const __pbase_type_info *thr_type,
void **thr_obj,
unsigned outer) const
{
// This static cast is always valid, as our caller will have determined that
// thr_type is really a __pointer_to_member_type_info.
const __pointer_to_member_type_info *thrown_type =
static_cast <const __pointer_to_member_type_info *> (thr_type);
if (*__context_class != *thrown_type->__context_class)
return false; // not pointers to member of same class
return __pbase_type_info::__pointer_catch (thrown_type, thr_obj, outer);
}
} // namespace std
#endif
// Entry points for the compiler.
/* Low level match routine used by compiler to match types of catch
variables and thrown objects. */
extern "C" int
__throw_type_match_rtti_2 (const void *catch_type_r, const void *throw_type_r,
void *objptr, void **valp)
{
const type_info &catch_type = *(const type_info *)catch_type_r;
const type_info &throw_type = *(const type_info *)throw_type_r;
*valp = objptr;
#if !defined(__GXX_ABI_VERSION) || __GXX_ABI_VERSION < 100
// old abi
if (catch_type == throw_type)
return 1;
if (const __user_type_info *p
= dynamic_cast <const __user_type_info *> (&throw_type))
{
return p->upcast (catch_type, objptr, valp);
}
else if (const __pointer_type_info *fr =
dynamic_cast <const __pointer_type_info *> (&throw_type))
{
const __pointer_type_info *to =
dynamic_cast <const __pointer_type_info *> (&catch_type);
if (! to)
return 0;
const type_info *subfr = &fr->type, *subto = &to->type;
__attr_type_info::cv cvfrom, cvto;
if (const __attr_type_info *at
= dynamic_cast <const __attr_type_info *> (subfr))
{
cvfrom = at->attr;
subfr = &at->type;
}
else
cvfrom = __attr_type_info::NONE;
if (const __attr_type_info *at
= dynamic_cast <const __attr_type_info *> (subto))
{
cvto = at->attr;
subto = &at->type;
}
else
cvto = __attr_type_info::NONE;
if (((cvfrom & __attr_type_info::CONST)
> (cvto & __attr_type_info::CONST))
|| ((cvfrom & __attr_type_info::VOLATILE)
> (cvto & __attr_type_info::VOLATILE)))
return 0;
if (*subto == *subfr)
return 1;
else if (*subto == typeid (void)
&& dynamic_cast <const __func_type_info *> (subfr) == 0)
return 1;
else if (const __user_type_info *p
= dynamic_cast <const __user_type_info *> (subfr))
return p->upcast (*subto, objptr, valp);
else if (const __pointer_type_info *pfr
= dynamic_cast <const __pointer_type_info *> (subfr))
{
// Multi-level pointer conversion.
const __pointer_type_info *pto
= dynamic_cast <const __pointer_type_info *> (subto);
if (! pto)
return 0;
bool constp = (cvto & __attr_type_info::CONST);
for (subto = &pto->type, subfr = &pfr->type; ;
subto = &pto->type, subfr = &pfr->type)
{
if (const __attr_type_info *at
= dynamic_cast <const __attr_type_info *> (subfr))
{
cvfrom = at->attr;
subfr = &at->type;
}
else
cvfrom = __attr_type_info::NONE;
if (const __attr_type_info *at
= dynamic_cast <const __attr_type_info *> (subto))
{
cvto = at->attr;
subto = &at->type;
}
else
cvto = __attr_type_info::NONE;
if (((cvfrom & __attr_type_info::CONST)
> (cvto & __attr_type_info::CONST))
|| ((cvfrom & __attr_type_info::VOLATILE)
> (cvto & __attr_type_info::VOLATILE)))
return 0;
if (! constp
&& (((cvfrom & __attr_type_info::CONST)
< (cvto & __attr_type_info::CONST))
|| ((cvfrom & __attr_type_info::VOLATILE)
< (cvto & __attr_type_info::VOLATILE))))
return 0;
if (*subto == *subfr)
return 1;
pto = dynamic_cast <const __pointer_type_info *> (subto);
pfr = dynamic_cast <const __pointer_type_info *> (subfr);
if (! pto || ! pfr)
return 0;
if (! (cvto & __attr_type_info::CONST))
constp = false;
}
}
}
#else
// new abi
return catch_type.__do_catch (&throw_type, valp, 1);
#endif
return 0;
}
#if !defined(__GXX_ABI_VERSION) || __GXX_ABI_VERSION < 100
/* Backward compatibility wrapper. */
extern "C" void*
__throw_type_match_rtti (const void *catch_type_r, const void *throw_type_r,
void *objptr)
{
void *ret;
if (__throw_type_match_rtti_2 (catch_type_r, throw_type_r, objptr, &ret))
return ret;
return NULL;
}
#endif
/* Called from __cp_pop_exception. Is P the type_info node for a pointer
of some kind? */
bool
__is_pointer (void *p)
{
const type_info *t = reinterpret_cast <const type_info *>(p);
#if !defined(__GXX_ABI_VERSION) || __GXX_ABI_VERSION < 100
// old abi
const __pointer_type_info *pt =
dynamic_cast <const __pointer_type_info *> (t);
return pt != 0;
#else
// new abi
return t->__is_pointer_p ();
#endif
}
#if !defined(__GXX_ABI_VERSION) || __GXX_ABI_VERSION < 100
// old abi
extern "C" void
__rtti_ptr (void *addr, const char *n, const type_info *ti)
{ new (addr) __pointer_type_info (n, *ti); }
extern "C" void
__rtti_attr (void *addr, const char *n, int attrval, const type_info *ti)
{
new (addr) __attr_type_info
(n, static_cast <__attr_type_info::cv> (attrval), *ti);
}
extern "C" void
__rtti_func (void *addr, const char *name)
{ new (addr) __func_type_info (name); }
extern "C" void
__rtti_ptmf (void *addr, const char *name)
{ new (addr) __ptmf_type_info (name); }
extern "C" void
__rtti_ptmd (void *addr, const char *name)
{ new (addr) __ptmd_type_info (name); }
extern "C" void
__rtti_array (void *addr, const char *name)
{ new (addr) __array_type_info (name); }
extern "C" void *
__dynamic_cast (const type_info& (*from)(void), const type_info& (*to)(void),
int require_public, void *address, const type_info & (*sub)(void), void *subptr)
{
if (!require_public) abort();
return static_cast <__user_type_info const &> (from ()).dyncast
(/*boff=*/-1, to (), address, sub (), subptr);
}
extern "C" void *
__dynamic_cast_2 (const type_info& (*from)(void), const type_info& (*to)(void),
int boff,
void *address, const type_info & (*sub)(void), void *subptr)
{
return static_cast <__user_type_info const &> (from ()).dyncast
(boff, to (), address, sub (), subptr);
}
// type_info nodes and functions for the builtin types. The mangling here
// must match the mangling in gcc/cp/rtti.c.
#define BUILTIN(mangled) \
unsigned char __ti##mangled [sizeof (__builtin_type_info)] \
__attribute__ ((aligned (__alignof__ (void *)))); \
extern "C" const type_info &__tf##mangled (void) { \
if ((*(void **) __ti##mangled) == 0) \
new (__ti##mangled) __builtin_type_info (#mangled); \
return *(type_info *)__ti##mangled; \
}
BUILTIN (v); BUILTIN (x); BUILTIN (l); BUILTIN (i); BUILTIN (s); BUILTIN (b);
BUILTIN (c); BUILTIN (w); BUILTIN (r); BUILTIN (d); BUILTIN (f);
BUILTIN (Ui); BUILTIN (Ul); BUILTIN (Ux); BUILTIN (Us); BUILTIN (Uc);
BUILTIN (Sc);
#endif