Hi there,
When trying to read a TTimeStamp object stored on a TTree which is coming from a function, ROOT crashes with some message like /include/TTreeReaderValue.h:139:14: warning: invalid memory pointer passed to a callee: return fProxy->IsaPointer() ? *(T**)address : (T*)address; but I see the function returning a valid pointer to the TTree. After some work, I came up with a way to reproduce the issue:
/// TestTS.C
TTree *GetTree(){
TTree *t = new TTree("t","t");
TTimeStamp date;
TBranch *fTimeStamp = t->Branch("fTimeStamp", &date);
for(Int_t i = 1; i < 30; i++){
date = TTimeStamp(2018,01,i,00,00,00,0);
t->Fill();
}
return t;
}
Int_t TestTS(){
TTree *tree = GetTree();
// Make sure
tree->Print();
if(tree){
TTreeReader fReader(tree);
TTreeReaderValue<TTimeStamp> fTS(fReader,"fTimeStamp");
while(fReader.Next()){
printf("%s\n", fTS->AsString());
}
}
return 0;
}
Do you guys have any idea where I can look up to fix it? If I define everything in the same function there’s no problem, so my guess is it is something about the scope of the pointer, but I’m having a hard time trying to figure out how to fix it. Any suggestion would be appreciated.
Related:
Danilo
January 7, 2018, 7:53am
2
Hi,
what ROOT verison is this? The master seems to be unaffected*
Cheers,
--------------------------------------------------------------------------
| Welcome to ROOT 6.13/01 http://root.cern.ch |
| (c) 1995-2017, The ROOT Team |
| Built for macosx64 |
| From heads/FixROOT-8127@v6-11-02-1286-gc56d0d1c99, Jan 04 2018, 07:15:06 |
| Try '.help', '.demo', '.license', '.credits', '.quit'/'.q' |
--------------------------------------------------------------------------
Processing TestTS.C...
******************************************************************************
*Tree :t : t *
*Entries : 29 : Total = 2492 bytes File Size = 0 *
* : : Tree compression factor = 1.00 *
******************************************************************************
*Branch :fTimeStamp *
*Entries : 29 : BranchElement (see below) *
*............................................................................*
*Br 0 :fSec : Int_t *
*Entries : 29 : Total Size= 753 bytes One basket in memory *
*Baskets : 0 : Basket Size= 32000 bytes Compression= 1.00 *
*............................................................................*
*Br 1 :fNanoSec : Int_t *
*Entries : 29 : Total Size= 777 bytes One basket in memory *
*Baskets : 0 : Basket Size= 32000 bytes Compression= 1.00 *
*............................................................................*
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
Wed, 30 Mar 2022 10:33:04 UTC + 35 nsec
(int) 0
In your “GetTree” function, either define:
static TTimeStamp date;
or, right before return t;, add:
t->ResetBranchAddresses(); // "disconnect" from local variables
Hi @Wile_E_Coyote , Thank you! That rocks!.
From the docs :
Note: The pointer whose address is passed to TTree::Branch must not be destroyed (i.e. go out of scope) until the TTree is deleted or TTree::ResetBranchAddress is called.
Hi @Danilo , it is root 6.10/04 . Are you using the same script? Because I see it is printing the same date and it is not the one that is being assigned.
system
January 21, 2018, 1:54pm
5
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