[cfe-dev] Need to debug creation of vtables: where is an enter point

[Reid Kleckner]

Check out clang/lib/AST/VTableBuilder.cpp.

On Wed, Oct 15, 2014 at 9:35 AM, Evgeny Astigeevich <
evgeny.astigeevich at arm.com> wrote:

> Hi all,
>
>
>
> I need to debug creation of vtables. I tried to setup break points at
> different places of CGVTT.cpp, CGCXXABI.h, CGVTables.cpp,
> ItaniumCXXABI.cpp, but gdb did not stop at them.
>
> I have:
>
>
>
> clang -cc1 version 3.6.0 based upon LLVM 3.6.0svn default target
> x86_64-unknown-linux-gnu
>
> Its run options:
>
> -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free
> -main-file-name test.cpp -mrelocation-model static -mthread-model posix
> -mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases
> -munwind-tables -target-cpu x86-64 -v -dwarf-column-info -coverage-file
> test.cpp -resource-dir
> /linux-x86_64-high/gcc_4.7.2/dbg/llvm/bin/../lib/clang/3.6.0
> -internal-isystem
> /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6
> -internal-isystem
> /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/x86_64-linux-gnu
> -internal-isystem
> /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/backward
> -internal-isystem /usr/local/include -internal-isystem
> /work/oss_llvm/trunk/work/build/linux-x86_64-high/gcc_4.7.2/dbg/llvm/bin/../lib/clang/3.6.0/include
> -internal-externc-isystem /usr/include/x86_64-linux-gnu
> -internal-externc-isystem /include -internal-externc-isystem /usr/include
> -O0 -fdeprecated-macro  -ferror-limit 19 -fmessage-length 205
> -mstackrealign -fobjc-runtime=gcc -fcxx-exceptions -fexceptions
> -fdiagnostics-show-option -o test.o -x c++ test.cpp
>
>
>
> In a created object file I see the following:
>
>
>
> _ZTVN10__cxxabiv117__class_type_infoE
>
>
>
> I found that it is defined in ItaniumCXXABI.cpp:
> "_ZTVN10__cxxabiv117__class_type_infoE", function
> ItaniumRTTIBuilder::BuildVTablePointer, but gdb did not stop there.
>
>
>
> Kind regards,
>
> Evgeny
>
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>
>
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