move emitUsedDirectiveFor to TargetLoweringObjectFile and rename it to
indicate that it is a predicate, not an emitter. This eliminates TAI
dependencies on Mangler and GlobalValue.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77726 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/TargetLoweringObjectFile.cpp b/lib/Target/TargetLoweringObjectFile.cpp
index 36fda0b..9ba12bb 100644
--- a/lib/Target/TargetLoweringObjectFile.cpp
+++ b/lib/Target/TargetLoweringObjectFile.cpp
@@ -585,6 +585,29 @@
return ReadOnlySection; // .const
}
+/// shouldEmitUsedDirectiveFor - This hook allows targets to selectively decide
+/// not to emit the UsedDirective for some symbols in llvm.used.
+// FIXME: REMOVE this (rdar://7071300)
+bool TargetLoweringObjectFileMachO::
+shouldEmitUsedDirectiveFor(const GlobalValue *GV, Mangler *Mang) const {
+ /// On Darwin, internally linked data beginning with "L" or "l" does not have
+ /// the directive emitted (this occurs in ObjC metadata).
+ if (!GV) return false;
+
+ // Check whether the mangled name has the "Private" or "LinkerPrivate" prefix.
+ if (GV->hasLocalLinkage() && !isa<Function>(GV)) {
+ // FIXME: ObjC metadata is currently emitted as internal symbols that have
+ // \1L and \0l prefixes on them. Fix them to be Private/LinkerPrivate and
+ // this horrible hack can go away.
+ const std::string &Name = Mang->getMangledName(GV);
+ if (Name[0] == 'L' || Name[0] == 'l')
+ return false;
+ }
+
+ return true;
+}
+
+
//===----------------------------------------------------------------------===//
// COFF
//===----------------------------------------------------------------------===//