[LLVMbugs] [Bug 23908] New: Consider emitting all variables in collectVariableInfo(), even ones with no ranges

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23908

            Bug ID: 23908
           Summary: Consider emitting all variables in
                    collectVariableInfo(), even ones with no ranges
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: DebugInfo
          Assignee: unassignedbugs at nondot.org
          Reporter: dexonsmith at apple.com
                CC: aprantl at apple.com, dblaikie at gmail.com,
                    llvmbugs at cs.uiuc.edu
    Classification: Unclassified

If a variable in `DbgValues` has no ranges, we currently don't emit it.  In the
review thread leading to r240244, David and Adrian suggested that we should
emit it anyway.  As an example of why, consider:

    int foo(int f) {
      if (bar()) {
        bool f = false;
        // ...
      }
      // ...
    }

If the local variable `f` is optimized out, the debugger should still "know"
about it.  Otherwise, evaluating `expression f` when stepping through the `if`
statement will refer to the parameter.

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