[lldb-dev] RTTI does not work stable in LLDB.

[Greg Clayton via lldb-dev]

I am looking at this now. I will let you know what I find.

Greg

> On Feb 6, 2017, at 10:00 AM, Roman Popov <ripopov at gmail.com> wrote:
> 
> Yes, that was my thought. 
> 
> FYI, checked in GDB: it's working correctly on this testcase showing correct dynamic type in both cases.
> 
> 2017-02-06 9:48 GMT-08:00 Greg Clayton <gclayton at apple.com <mailto:gclayton at apple.com>>:
> You have found a bug. It should be reporting this correctly but it isn’t. I verified it fails on MacOSX.
> 
> Greg Clayton
> 
>> On Feb 5, 2017, at 1:19 PM, Roman Popov via lldb-dev <lldb-dev at lists.llvm.org <mailto:lldb-dev at lists.llvm.org>> wrote:
>> 
>> Hello,
>> I'm observing very strange LLDB behavior: it does not always shows a correct dynamic type when I ask for.
>> 
>> Originally I was working with LLDB 3.9, but it looks like trunk version behaves the same strange way.  
>> 
>> I was able to capture this behavior in a small code snippet: 
>> 
>> #include <iostream>
>> #include <typeinfo>
>> 
>> using namespace std;
>> 
>> struct base_type {  virtual ~base_type(){} };
>> 
>> template <class T1, class T2, unsigned SIZE>
>> struct derived0 : base_type {};
>> 
>> template <class T1, class T2>
>> struct derived1 : base_type {};
>> 
>> int main(int argc, char ** argv) {
>> 
>>     base_type * bptr0 = new derived0<int, int, 1024>();
>>     base_type * bptr1 = new derived1<int, int >();
>> 
>>     cout << typeid(*bptr0).name() << endl;
>>     cout << typeid(*bptr1).name() << endl;
>> 
>>     return 0;
>> }
>> 
>> 
>> lldb --version
>> lldb version 5.0.0 (http://llvm.org/svn/llvm-project/lldb/trunk <http://llvm.org/svn/llvm-project/lldb/trunk> revision 293398)
>>   clang revision 293398
>>   llvm revision 293398
>> 
>> 
>> Testing in LLDB:
>> (lldb) break set --file main.cpp --line 22
>> 
>> (lldb) expression -d no-run --  bptr1
>> (derived1<int, int> *) $2 = 0x0000000000614c40
>> 
>> (lldb) expression -d no-run --  bptr0
>> (base_type *) $3 = 0x0000000000614c20
>> 
>> 
>> Can someone explain me why for bptr0 I dont get a  derived0<int, int, 1024> * as I expected?
>> 
>> 
>> Thanks,
>> Roman
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> 
> 

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