vendor/llvm/llvm-trunk-r291274

1 files changed, 12 insertions, 1 deletions

diff --git a/include/llvm/Transforms/IPO/FunctionImport.h b/include/llvm/Transforms/IPO/FunctionImport.h
index d7acbe883c5d..eaea092c9179 100644
--- a/include/llvm/Transforms/IPO/FunctionImport.h
+++ b/include/llvm/Transforms/IPO/FunctionImport.h
@@ -86,11 +86,15 @@ public:
 /// \p ExportLists contains for each Module the set of globals (GUID) that will
 /// be imported by another module, or referenced by such a function. I.e. this
 /// is the set of globals that need to be promoted/renamed appropriately.
+///
+/// \p DeadSymbols (optional) contains a list of GUID that are deemed "dead" and
+/// will be ignored for the purpose of importing.
 void ComputeCrossModuleImport(
     const ModuleSummaryIndex &Index,
     const StringMap<GVSummaryMapTy> &ModuleToDefinedGVSummaries,
     StringMap<FunctionImporter::ImportMapTy> &ImportLists,
-    StringMap<FunctionImporter::ExportSetTy> &ExportLists);
+    StringMap<FunctionImporter::ExportSetTy> &ExportLists,
+    const DenseSet<GlobalValue::GUID> *DeadSymbols = nullptr);
 
 /// Compute all the imports for the given module using the Index.
 ///
@@ -100,6 +104,13 @@ void ComputeCrossModuleImportForModule(
     StringRef ModulePath, const ModuleSummaryIndex &Index,
     FunctionImporter::ImportMapTy &ImportList);
 
+/// Compute all the symbols that are "dead": i.e these that can't be reached
+/// in the graph from any of the given symbols listed in
+/// \p GUIDPreservedSymbols.
+DenseSet<GlobalValue::GUID>
+computeDeadSymbols(const ModuleSummaryIndex &Index,
+                   const DenseSet<GlobalValue::GUID> &GUIDPreservedSymbols);
+
 /// Compute the set of summaries needed for a ThinLTO backend compilation of
 /// \p ModulePath.
 //