[Lldb-commits] [lldb] [llvm] Add support for using foreign type units in .debug_names. (PR #87740)

[Pavel Labath via lldb-commits]

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@@ -0,0 +1,127 @@
+// REQUIRES: lld
+
+// This test will make a type that will be compiled differently into two
+// different .dwo files in a type unit with the same type hash, but with
+// differing contents. Clang's type unit signature is based only on the mangled
+// name of the type, regardless of the contents of the type, so that will help
+// us test foreign type units in the .debug_names section of the main
+// executable. When a DWP file is made, only one type unit will be kept and the
+// type unit that is kept has the .dwo file name that it came from. When LLDB
+// loads the foreign type units, it needs to verify that any entries from
+// foreign type units come from the right .dwo file. We test this since the
+// contents of type units are not always the same even though they have the same
+// type hash. We don't want invalid accelerator table entries to come from one
+// .dwo file and be used on a type unit from another since this could cause
+// invalid lookups to happen. LLDB knows how to track down which .dwo file a
+// type unit comes from by looking at the DW_AT_dwo_name attribute in the
+// DW_TAG_type_unit.
+
+// Now test with DWARF5
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labath wrote:

This line doesn't make sense here. I guess it was copied from a test with multiple flavours.

https://github.com/llvm/llvm-project/pull/87740