Missing call stack frames because adjusted_frame_base not applied during PE_UnwindOpCode_SET_FPREG

[mistymntncop]

I encountered this bug when debugging V8. You can reproduce it in V8 by using the arguments "--shell --allow-natives-syntax" and then typing "%SystemBreak();" into the d8 shell.

The callstack contains missing (and incorrect) stack frames.

I had a look and it seems the issue is that in the case that adjusted_frame_base == raw_frame_base the frame_base won't be updated properly for the PE_UnwindOpCode_SET_FPREG opcode. An off-by-one.

Removing the check seems to fix it.

        //if(adjusted_frame_base < raw_frame_base)
        {
          frame_base = adjusted_frame_base;
        }

[ryanfleury]

Thanks for looking into this; fixed as of 64e5d60. This will be in 0.9.12.