Manman Ren 14a029d9f3 Debug Info: use DW_FORM_ref_addr instead of DW_FORM_ref4 if the referenced DIE ...

belongs to a different compile unit.

DW_FORM_ref_addr should be used for cross compile-unit reference.

When compiling a large application, we got a dwarfdump verification error where
abstract_origin points to nowhere.

This error can't be reproduced on any testing case in MultiSource.
We may have other cases where we use DW_FORM_ref4 unconditionally.

rdar://problem/13370501

llvm-svn: 176882

2013-03-12 18:27:15 +00:00

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