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Note we don't want to unload transaction so soon as this might remove the header files still needed
(they need to be removed by the library .... which is still a to-be-done feature)
To handle 'Float_t*', quickFindType uses no memory (instead of 183B for findType) and is much faster
(6 times in this case), the cost is the additional ('unnecessary') checks in the cases not handled by
quickFindType.
When the type comes (directly or indirectly) from being used as a template paramater, it is decorated
by SubstTemplateTypeParmType which gets in the way of properly getting the name correct (leads to
'std::const string'.
Original problem:
set atlas shell environment
root.exe
TFile *_file0 = TFile::Open("atlasfile.root");
bunch of Warning about missing dictionary
c = TClass::GetClass("GaudiCommon<Algorithm>")
Error in <TProtoClass::FindDataMember>: data member with index 0 is not found in class GaudiUtils::Map<string,SmartIF<IService>,__gnu_cxx::hash_map<string,SmartIF<IService>,GaudiUtils::Hash<string>,equal_to<s
tring>,allocator<SmartIF<IService> > > >
Error in <CreateRealData>: Cannot find data member # 0 of class GaudiUtils::Map<string,SmartIF<IService>,__gnu_cxx::hash_map<string,SmartIF<IService>,GaudiUtils::Hash<string>,equal_to<string>,allocator<SmartI
F<IService> > > > for parent GaudiCommon<Algorithm>!
c->GetListOfRealData()->ls();
...
OBJ: TRealData m_services Description of persistent data members : 0 at: 0x9d46d70
OBJ: TRealData m_errors Description of persistent data members : 0 at: 0x9d47cb0
...
Tweak of the problem:
c = TClass::GetClass("GaudiCommon<Algorithm>");
c->GetListOfRealData()->ls();
...
OBJ: TRealData m_services Description of persistent data members : 0 at: 0x300ce10
OBJ: TRealData m_services. Description of persistent data members : 0 at: 0x300e9c0
OBJ: TRealData m_errors Description of persistent data members : 0 at: 0x300eaa0
...
Note: no error or warning but the ListOfRealData is 'wrong'.
Correct behavior:
TClass::GetClass("SmartIF<IService>");
TFile *_file0 = TFile::Open("atlasfile.root");
TClass::GetClass("GaudiUtils::Map<string,SmartIF<IService>,__gnu_cxx::hash_map<string,SmartIF<IService>,GaudiUtils::Hash<string>,equal_to<string>,allocator<SmartIF<IService> > > >");
c = TClass::GetClass("GaudiCommon<Algorithm>");
c->GetListOfRealData()->ls();
...
OBJ: TRealData m_services Description of persistent data members : 0 at: 0xc81c820
OBJ: TRealData m_services.m_map Description of persistent data members : 0 at: 0xc81dd00
OBJ: TRealData m_errors Description of persistent data members : 0 at: 0xc81ddb0
...
See autoparse for
unary_function<pair<const string,SmartIF<IService> >,const string>
SmartIF<IService>
Analysis:
1) Opening the file triggering the autoloading of a lots of libraries and the autoparsing of many files.
This includes the declaration of Gaudi::Map but *not* of SmartIF nor SmartIF<IService>.
[Side note: this autoloading is due to DataVector<xAOD::Jet_v1> not having a dictionary]
2) During TClass::GetClass("GaudiCommon<Algorithm>"), the TProtoClass::FillTClass is called and
disable autoloading and autoparsing and then request the GaudiUtils::Map
3) Since there is no dictionary for GaudiUtils::Map, findScope is invoked.
4) During findScope, the instantiation of GaudiUtils::Map fails with an error similar to:
error: field has incomplete type 'SmartIF<IService>'
5) The error handling code path in this case in findScope did *not* revert the transaction
and unload the 'invalid' decl for the GaudiUtils::Map
6) TClingClassInfo assume all decl are valid but finds and use the invalid decl
7) In this case, the invalidity of the decl leads to a lack of data members
8) Thus TProtoClass::FindDataMember complains about the discrepency between the TProtoClass
information and the information from the decl.
Requesting the TClass for the GaudiUtils::Map when autoloading and autoparsing are leads
to the proper instantiation and thus success.
Requesting the TClass for GaudiCommon<Algorithm> before loading the file means that
when the request for the TClass for GaudiUtils::Map is done, the declaration for
GaudiUtils::Map has not yet been parsed and thus findScope use a different error
handling code path (one where the instantiation is not even attempted).
In normal circunstances (all dictionary properly generated and loaded/loadable),
the missing name part in the list of real data member is not fatal (it would be
if it was the case during the initial gathering of information but as it is, all
the necessary information is already in the rootpcm files).
This reverts commit 125a93e0e3562dac5d5a0429ce49a2b625025c26.
It fails in the following case (roottest/root/io/evolution/pragma_read):
dictionary for a/b.h which includes a/c.h as #include "c.h"
This will add a fwd decl with annotation "c.h", but this header cannot
be found. Instead we'd need "a/c.h"...
