I presume you meant "step over is not working" in the Subject?
The call to std::cout... ends up inserting quite a number of inlined function
calls into my_func. clang is not always great at generating coherent
line-table and inlined subroutine ranges for deeply nested inlining, so that
the stepping machinery can't safely figure out how to get out of the inlining,
and ends up stopping. This example actually works correctly on macOS with a
recent clang, but this has been an ongoing issue for a while now.
lldb currently always implements "step over" as "step in" followed by "step
out". This saves us the (sometimes surprisingly tricky) work of predicting
where a particular call will go, and where it will return to. But it does
leave us vulnerable to errors in the debug information at the callee site. It
would be nice to add a set of "vanilla" calls that we're sure we can predict,
and for those we could just break on the return address and not even bother to
step in. That would likely remove this sort of stumble in a lot of cases.
OTOH, you should still file a bug about this. As I said, this works correctly
on current TOT lldb/clang 802 on macOS. So it may also be some issue with the
Windows port unrelated to this debug info problem.
Jim
> On Feb 28, 2017, at 3:35 AM, olizit via lldb-dev <lldb-dev@lists.llvm.org>
> wrote:
>
> Hello,
>
> Compile this sample program with clang 3.9.1 in 64bits mode
> #include <iostream>
>
> int my_func(char c, double d)
> {
> std::cout << "c: " << c << std::endl;
> std::cout << "d:" << d << std::endl;
> return 0;
> }
>
> int main(int argc, char const *argv[])
> {
> int i = 0;
> i++;
> i++;
> my_func('a', 10.1);
> i++;
> i++;
>
> return 0;
> }
>
> compile commande line :
> clang++ -x c++ -target "x86_64-pc-windows-msvc" -O0 -glldb -gdwarf-4 -D
> _WIN32 -D _WIN64 -D _CONSOLE -D NDEBUG -D _DEBUG -D _MT -D _DLL -c -o main.o
> main.cpp
> lld-link /out:main.exe /machine:X64 /nxcompat /incremental /nologo /wx
> /subsystem:console /debug vcruntimed.lib msvcrtd.lib main.o
>
> run lldb and enter commands
> target create "main.exe"
> b main.cpp:14
> r
>
> First step over (n command) is ok but second step over goes into my_func
> function.
>
>
> Thanks,
>
> Olivier
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> lldb-dev@lists.llvm.org
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