[PATCH] DebugInfo: Permit DW_TAG_structure_type, DW_TAG_member, DW_TAG_typedef tags with empty file names.

[Peter Collingbourne]

Hi dexonsmith,

Some languages, such as Go, have pre-defined structure types (e.g. "string"
is essentially a pointer/length pair) or pre-defined "typedef" types
(e.g. "error" is essentially a typedef for a specific interface type).
Such types do not have associated source location, so a Go frontend would
be correct not to associate a file name with such types.

This change relaxes the DIType verifier to permit unlocated types with
these tags.

http://reviews.llvm.org/D8588

Files:
  lib/IR/DebugInfo.cpp

Index: lib/IR/DebugInfo.cpp
===================================================================
--- lib/IR/DebugInfo.cpp
+++ lib/IR/DebugInfo.cpp
@@ -283,7 +283,9 @@
         Tag != dwarf::DW_TAG_restrict_type && Tag != dwarf::DW_TAG_array_type &&
         Tag != dwarf::DW_TAG_enumeration_type &&
         Tag != dwarf::DW_TAG_subroutine_type &&
-        Tag != dwarf::DW_TAG_inheritance && Tag != dwarf::DW_TAG_friend)
+        Tag != dwarf::DW_TAG_inheritance && Tag != dwarf::DW_TAG_friend &&
+        Tag != dwarf::DW_TAG_structure_type && Tag != dwarf::DW_TAG_member &&
+        Tag != dwarf::DW_TAG_typedef)
       return false;
   }

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