Hi, O ur company is using Buck(https://buckbuild.com/) to build internal service. Recently the build team made a change in buck to not merge dwarf symbols from each object file into final binary so debugger needs to read source/symbol table from compilation unit itself. This seems to break the lldb in various aspect: 1. Setting source line breakpoint in library files are not working 2. Callstack did not show the source location well for library frame
I tried latest lldb which this bug still reproduces. Here is the logging for it: (lldb) b TaoDataLayer.cpp:50 Target::AddBreakpoint (internal = no) => break_id = 6: file = 'TaoDataLayer.cpp', line = 50, exact_match = 0 *error: Unable to set breakpoint for TaoDataLayer.cpp:50 at file address 0xffffffffffffffff* Breakpoint 6: no locations (pending). WARNING: Unable to resolve breakpoint to any actual locations. My debugging shows the Address::IsValid() returns false for line start symbol here because it's file address is 0xffffffffffffffff: https://github.com/llvm-mirror/lldb/blob/ceb5f6cd339a4bcd49666158578f883c1ec96663/source/Breakpoint/BreakpointResolver.cpp#L263 It seems that, after locating the symbol for the line_entry, the code below did not update sc.line_entry pointing to the original line_entry so it contains the uninitialized 0xffffffffffffffff value which will fail the isValid() check later: https://github.com/llvm-mirror/lldb/blob/26fea9dbbeb3020791cdbc46fbf3cc9d7685d7fd/source/Symbol/CompileUnit.cpp#L375 I tried to fix this by doing "sc.line_entry = line_entry;" before both resolve_scope branches. This seems to fix the breakpoint but the callstack and source locator still can't locate the source file correctly while hitting the breakpoint. Questions: 1. Is this a known issue? If so, is there any existing fix I can port? 2. If not, does my investigation above sound reasonable? Any suggestion/direction for callstack and source locator part of fix? Thanks Jeffrey
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