301 lines
8.2 KiB
C++
301 lines
8.2 KiB
C++
// Methods for type_info for -*- C++ -*- Run Time Type Identification.
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// Copyright (C) 1994, 96-97, 1998 Free Software Foundation
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// This file is part of GNU CC.
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// GNU CC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// GNU CC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with GNU CC; see the file COPYING. If not, write to
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// the Free Software Foundation, 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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// As a special exception, if you link this library with other files,
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// some of which are compiled with GCC, to produce an executable,
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// this library does not by itself cause the resulting executable
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// to be covered by the GNU General Public License.
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// This exception does not however invalidate any other reasons why
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// the executable file might be covered by the GNU General Public License.
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#include <stddef.h>
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#include "tinfo.h"
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#include "new" // for placement new
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using std::type_info;
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bool
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type_info::before (const type_info &arg) const
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{
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return strcmp (name (), arg.name ()) < 0;
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}
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// type info for pointer type.
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struct __pointer_type_info : public type_info {
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const type_info& type;
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__pointer_type_info (const char *n, const type_info& ti)
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: type_info (n), type (ti) {}
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};
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// type info for attributes
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struct __attr_type_info : public type_info {
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enum cv { NONE = 0, CONST = 1, VOLATILE = 2, CONSTVOL = 1 | 2 };
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const type_info& type;
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cv attr;
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__attr_type_info (const char *n, cv a, const type_info& t)
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: type_info (n), type (t), attr (a) {}
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};
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// type_info for builtin type
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struct __builtin_type_info : public type_info {
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__builtin_type_info (const char *n): type_info (n) {}
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};
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// type info for function.
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struct __func_type_info : public type_info {
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__func_type_info (const char *n) : type_info (n) {}
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};
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// type info for pointer to member function.
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struct __ptmf_type_info : public type_info {
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__ptmf_type_info (const char *n) : type_info (n) {}
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};
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// type info for pointer to data member.
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struct __ptmd_type_info : public type_info {
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__ptmd_type_info (const char *n): type_info (n) {}
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};
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// type info for array.
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struct __array_type_info : public type_info {
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__array_type_info (const char *n): type_info (n) {}
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};
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// Entry points for the compiler.
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/* Low level match routine used by compiler to match types of catch
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variables and thrown objects. */
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extern "C" void*
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__throw_type_match_rtti (const void *catch_type_r, const void *throw_type_r,
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void *objptr)
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{
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const type_info &catch_type = *(const type_info *)catch_type_r;
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const type_info &throw_type = *(const type_info *)throw_type_r;
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if (catch_type == throw_type)
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return objptr;
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#if 0
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printf ("We want to match a %s against a %s!\n",
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throw_type.name (), catch_type.name ());
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#endif
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void *new_objptr = 0;
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if (const __user_type_info *p
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= dynamic_cast <const __user_type_info *> (&throw_type))
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{
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/* The 1 skips conversions to private bases. */
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new_objptr = p->dcast (catch_type, 1, objptr);
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}
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else if (const __pointer_type_info *fr =
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dynamic_cast <const __pointer_type_info *> (&throw_type))
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{
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const __pointer_type_info *to =
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dynamic_cast <const __pointer_type_info *> (&catch_type);
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if (! to)
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goto fail;
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const type_info *subfr = &fr->type, *subto = &to->type;
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__attr_type_info::cv cvfrom, cvto;
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if (const __attr_type_info *at
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= dynamic_cast <const __attr_type_info *> (subfr))
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{
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cvfrom = at->attr;
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subfr = &at->type;
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}
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else
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cvfrom = __attr_type_info::NONE;
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if (const __attr_type_info *at
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= dynamic_cast <const __attr_type_info *> (subto))
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{
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cvto = at->attr;
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subto = &at->type;
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}
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else
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cvto = __attr_type_info::NONE;
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if (((cvfrom & __attr_type_info::CONST)
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> (cvto & __attr_type_info::CONST))
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|| ((cvfrom & __attr_type_info::VOLATILE)
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> (cvto & __attr_type_info::VOLATILE)))
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goto fail;
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if (*subto == *subfr)
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new_objptr = objptr;
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else if (*subto == typeid (void)
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&& dynamic_cast <const __func_type_info *> (subfr) == 0)
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new_objptr = objptr;
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else if (const __user_type_info *p
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= dynamic_cast <const __user_type_info *> (subfr))
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{
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/* The 1 skips conversions to private bases. */
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new_objptr = p->dcast (*subto, 1, objptr);
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}
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else if (const __pointer_type_info *pfr
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= dynamic_cast <const __pointer_type_info *> (subfr))
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{
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// Multi-level pointer conversion.
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const __pointer_type_info *pto
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= dynamic_cast <const __pointer_type_info *> (subto);
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if (! pto)
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goto fail;
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bool constp = (cvto & __attr_type_info::CONST);
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for (subto = &pto->type, subfr = &pfr->type; ;
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subto = &pto->type, subfr = &pfr->type)
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{
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if (const __attr_type_info *at
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= dynamic_cast <const __attr_type_info *> (subfr))
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{
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cvfrom = at->attr;
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subfr = &at->type;
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}
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else
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cvfrom = __attr_type_info::NONE;
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if (const __attr_type_info *at
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= dynamic_cast <const __attr_type_info *> (subto))
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{
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cvto = at->attr;
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subto = &at->type;
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}
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else
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cvto = __attr_type_info::NONE;
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if (((cvfrom & __attr_type_info::CONST)
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> (cvto & __attr_type_info::CONST))
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|| ((cvfrom & __attr_type_info::VOLATILE)
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> (cvto & __attr_type_info::VOLATILE)))
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goto fail;
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if (! constp
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&& (((cvfrom & __attr_type_info::CONST)
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< (cvto & __attr_type_info::CONST))
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|| ((cvfrom & __attr_type_info::VOLATILE)
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< (cvto & __attr_type_info::VOLATILE))))
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goto fail;
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if (*subto == *subfr)
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{
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new_objptr = objptr;
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break;
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}
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pto = dynamic_cast <const __pointer_type_info *> (subto);
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pfr = dynamic_cast <const __pointer_type_info *> (subfr);
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if (! pto || ! pfr)
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goto fail;
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if (! (cvto & __attr_type_info::CONST))
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constp = false;
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}
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}
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}
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fail:
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#if 0
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if (new_objptr)
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printf ("It converts, delta is %d\n", new_objptr-objptr);
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#endif
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return new_objptr;
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}
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/* Called from __cp_pop_exception. Is P the type_info node for a pointer
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of some kind? */
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bool
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__is_pointer (void *p)
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{
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const type_info *t = reinterpret_cast <const type_info *>(p);
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const __pointer_type_info *pt =
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dynamic_cast <const __pointer_type_info *> (t);
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return pt != 0;
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}
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extern "C" void
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__rtti_ptr (void *addr, const char *n, const type_info *ti)
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{ new (addr) __pointer_type_info (n, *ti); }
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extern "C" void
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__rtti_attr (void *addr, const char *n, int attrval, const type_info *ti)
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{
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new (addr) __attr_type_info
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(n, static_cast <__attr_type_info::cv> (attrval), *ti);
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}
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extern "C" void
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__rtti_func (void *addr, const char *name)
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{ new (addr) __func_type_info (name); }
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extern "C" void
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__rtti_ptmf (void *addr, const char *name)
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{ new (addr) __ptmf_type_info (name); }
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extern "C" void
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__rtti_ptmd (void *addr, const char *name)
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{ new (addr) __ptmd_type_info (name); }
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extern "C" void
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__rtti_array (void *addr, const char *name)
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{ new (addr) __array_type_info (name); }
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extern "C" void *
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__dynamic_cast (const type_info& (*from)(void), const type_info& (*to)(void),
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int require_public, void *address,
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const type_info & (*sub)(void), void *subptr)
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{
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return static_cast <const __user_type_info &> (from ()).dcast
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(to (), require_public, address, &(sub ()), subptr);
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}
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// type_info nodes and functions for the builtin types. The mangling here
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// must match the mangling in gcc/cp/rtti.c.
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#define BUILTIN(mangled) \
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unsigned char __ti##mangled [sizeof (__builtin_type_info)] \
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__attribute__ ((aligned (__alignof__ (void *)))); \
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extern "C" const type_info &__tf##mangled (void) { \
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if ((*(void **) __ti##mangled) == 0) \
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new (__ti##mangled) __builtin_type_info (#mangled); \
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return *(type_info *)__ti##mangled; \
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}
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BUILTIN (v); BUILTIN (x); BUILTIN (l); BUILTIN (i); BUILTIN (s); BUILTIN (b);
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BUILTIN (c); BUILTIN (w); BUILTIN (r); BUILTIN (d); BUILTIN (f);
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BUILTIN (Ui); BUILTIN (Ul); BUILTIN (Ux); BUILTIN (Us); BUILTIN (Uc);
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BUILTIN (Sc);
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