[LLDB] The breakpoint can not be hit for F5 after a 'Step over' into a function

Internal bug id: 259942

Configuration:

VSCode(stable)+ CPP Extension(20160902.1)+ LLDB

Steps to repro:

1. Copy the debuggee, and open it with VSCode.

src.zip

(You can compile by yourself,please use the command:

step 1: clang++ -g -O0 -std=c++11 -shared -fpic -m64 mylib.cpp -o mylib.so

step 2: clang++ -g -O0 -pthread -std=c++11 -m64 myapp.cpp -o myapp )

2. Update "program" in launch.json as following:

        "program": "${workspaceRoot}/myapp",
   

3. Set breakpoints at the line of 73 in myapp.cpp, at the line of 9 in mylib.cpp, at the line of 16 in mylib.cpp.

4. Press F5 to start debugging.(Hit the breakpoint at the line of 73 in myapp.cpp)

5. Step over.(Hit the breakpoint at the line of 9 in mylib.cpp)

6. Click Continue Button

Expected:

Hit the breakpoint at the line of 16 in mylib.cpp.

Actual:

Hit the line of 75 in myapp.cpp.

Investigation:

1. This issue only repro on Mac.

2. The step 5(Step over) cause this issue. If change the step 5 to Step into or Continue, the results will be expected.

Reproduce the Mac-only case using myapp.cpp and mylib.cpp, compiling them with the commands in the issue and configuring launch.json. Start with the F5, step-over, and continue sequence under LLDB, then inspect how the breakpoint at line 16 in mylib.cpp is handled. Done means continuing after the step-over hits line 16 rather than line 75 in myapp.cpp.