/*?Functions?related?to?invoking?methods?and?overloaded?functions.
???Copyright?（C）?1987?1992?1993?1994?1995?1996?1997?1998
???1999?2000?2001?2002?2003?2004?2005?2006?2007?2008?2009?2010
???Free?Software?Foundation?Inc.
???Contributed?by?Michael?Tiemann?（tiemann@cygnus.com）?and
???modified?by?Brendan?Kehoe?（brendan@cygnus.com）.

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?3?or?（at?your?option）
any?later?version.

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?GCC;?see?the?file?COPYING3.??If?not?see
.??*/


/*?High-level?class?interface.??*/

#include?“config.h“
#include?“system.h“
#include?“coretypes.h“
#include?“tm.h“
#include?“tree.h“
#include?“cp-tree.h“
#include?“output.h“
#include?“flags.h“
#include?“toplev.h“
#include?“diagnostic-core.h“
#include?“intl.h“
#include?“target.h“
#include?“convert.h“
#include?“l(fā)anghooks.h“
#include?“c-family/c-objc.h“

/*?The?various?kinds?of?conversion.??*/

typedef?enum?conversion_kind?{
??ck_identity
??ck_lvalue
??ck_qual
??ck_std
??ck_ptr
??ck_pmem
??ck_base
??ck_ref_bind
??ck_user
??ck_ambig
??ck_list
??ck_aggr
??ck_rvalue
}?conversion_kind;

/*?The?rank?of?the?conversion.??Order?of?the?enumerals?matters;?better
???conversions?should?come?earlier?in?the?list.??*/

typedef?enum?conversion_rank?{
??cr_identity
??cr_exact
??cr_promotion
??cr_std
??cr_pbool
??cr_user
??cr_ellipsis
??cr_bad
}?conversion_rank;

/*?An?implicit?conversion?sequence?in?the?sense?of?[over.best.ics].
???The?first?conversion?to?be?performed?is?at?the?end?of?the?chain.
???That?conversion?is?always?a?cr_identity?conversion.??*/

typedef?struct?conversion?conversion;
struct?conversion?{
??/*?The?kind?of?conversion?represented?by?this?step.??*/
??conversion_kind?kind;
??/*?The?rank?of?this?conversion.??*/
??conversion_rank?rank;
??BOOL_BITFIELD?user_conv_p?:?1;
??BOOL_BITFIELD?ellipsis_p?:?1;
??BOOL_BITFIELD?this_p?:?1;
??/*?True?if?this?conversion?would?be?permitted?with?a?bending?of
?????language?standards?e.g.?disregarding?pointer?qualifiers?or
?????converting?integers?to?pointers.??*/
??BOOL_BITFIELD?bad_p?:?1;
??/*?If?KIND?is?ck_ref_bind?ck_base_conv?true?to?indicate?that?a
?????temporary?should?be?created?to?hold?the?result?of?the
?????conversion.??*/
??BOOL_BITFIELD?need_temporary_p?:?1;
??/*?If?KIND?is?ck_ptr?or?ck_pmem?true?to?indicate?that?a?conversion
?????from?a?pointer-to-derived?to?pointer-to-base?is?being?performed.??*/
??BOOL_BITFIELD?base_p?:?1;
??/*?If?KIND?is?ck_ref_bind?true?when?either?an?lvalue?reference?is
?????being?bound?to?an?lvalue?exp