1 files changed, 23 insertions, 2 deletions
diff --git a/lib/Transforms/IPO/FunctionImport.cpp b/lib/Transforms/IPO/FunctionImport.cpp
index 6d34ab8b0d96..233a36d2bc54 100644
--- a/lib/Transforms/IPO/FunctionImport.cpp
+++ b/lib/Transforms/IPO/FunctionImport.cpp
@@ -64,6 +64,12 @@ static cl::opt<float> ImportHotMultiplier(
     "import-hot-multiplier", cl::init(3.0), cl::Hidden, cl::value_desc("x"),
     cl::desc("Multiply the `import-instr-limit` threshold for hot callsites"));
 
+static cl::opt<float> ImportCriticalMultiplier(
+    "import-critical-multiplier", cl::init(100.0), cl::Hidden,
+    cl::value_desc("x"),
+    cl::desc(
+        "Multiply the `import-instr-limit` threshold for critical callsites"));
+
 // FIXME: This multiplier was not really tuned up.
 static cl::opt<float> ImportColdMultiplier(
     "import-cold-multiplier", cl::init(0), cl::Hidden, cl::value_desc("N"),
@@ -207,6 +213,8 @@ static void computeImportForFunction(
         return ImportHotMultiplier;
       if (Hotness == CalleeInfo::HotnessType::Cold)
         return ImportColdMultiplier;
+      if (Hotness == CalleeInfo::HotnessType::Critical)
+        return ImportCriticalMultiplier;
       return 1.0;
     };
 
@@ -537,8 +545,6 @@ void llvm::thinLTOResolveWeakForLinkerModule(
   };
 
   auto updateLinkage = [&](GlobalValue &GV) {
-    if (!GlobalValue::isWeakForLinker(GV.getLinkage()))
-      return;
     // See if the global summary analysis computed a new resolved linkage.
     const auto &GS = DefinedGlobals.find(GV.getGUID());
     if (GS == DefinedGlobals.end())
@@ -546,6 +552,21 @@ void llvm::thinLTOResolveWeakForLinkerModule(
     auto NewLinkage = GS->second->linkage();
     if (NewLinkage == GV.getLinkage())
       return;
+
+    // Switch the linkage to weakany if asked for, e.g. we do this for
+    // linker redefined symbols (via --wrap or --defsym).
+    // We record that the visibility should be changed here in `addThinLTO`
+    // as we need access to the resolution vectors for each input file in
+    // order to find which symbols have been redefined.
+    // We may consider reorganizing this code and moving the linkage recording
+    // somewhere else, e.g. in thinLTOResolveWeakForLinkerInIndex.
+    if (NewLinkage == GlobalValue::WeakAnyLinkage) {
+      GV.setLinkage(NewLinkage);
+      return;
+    }
+
+    if (!GlobalValue::isWeakForLinker(GV.getLinkage()))
+      return;
     // Check for a non-prevailing def that has interposable linkage
     // (e.g. non-odr weak or linkonce). In that case we can't simply
     // convert to available_externally, since it would lose the