Drop debug info for DISubprograms that are not referenced by anything

This patch drops the debug info for all DISubprograms that are
(a) not attached to an llvm::Function and
(b) not indirectly reachable via inline scopes from any surviving Function and
(c) not reachable from a type (i.e.: member functions).

Background: I'm currently working on a patch to reverse the pointers
between DICompileUnit and DISubprogram (for more info check Duncan's RFC
on lazy-loading of debug info metadata
http://lists.llvm.org/pipermail/llvm-dev/2016-March/097419.html).
The idea is to remove the list of subprograms from DICompileUnit and
instead point to the owning compile unit from each DISubprogram.
After doing this all DISubprograms fulfilling the above criteria will be
implicitly dropped unless we go through an extra effort to preserve them.

http://reviews.llvm.org/D18477
<rdar://problem/25256815>

llvm-svn: 265876

1 files changed, 2 insertions, 4 deletions

diff --git a/llvm/test/DebugInfo/Generic/nodebug.ll b/llvm/test/DebugInfo/Generic/nodebug.ll
index 35da65d3b8b..aa7f85a91a6 100644
--- a/llvm/test/DebugInfo/Generic/nodebug.ll
+++ b/llvm/test/DebugInfo/Generic/nodebug.ll
@@ -16,10 +16,8 @@
 ;   f1();
 ; }
 
-; Check that there's only one DW_TAG_subprogram, nothing for the 'f2' function.
-; CHECK: DW_TAG_subprogram
-; CHECK-NOT: DW_TAG
-; CHECK:   DW_AT_name {{.*}} "f1"
+; Check that there's no DW_TAG_subprogram, not even for the 'f2' function.
+; CHECK: DW_TAG_compile_unit
 ; CHECK-NOT: DW_TAG_subprogram
 
 @i = external global i32