Do now allow InlineAlways pass to remove dead functions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58744 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 13 insertions, 0 deletions

diff --git a/lib/Transforms/IPO/InlineAlways.cpp b/lib/Transforms/IPO/InlineAlways.cpp
index d809b5a..9031432 100644
--- a/lib/Transforms/IPO/InlineAlways.cpp
+++ b/lib/Transforms/IPO/InlineAlways.cpp
@@ -45,6 +45,9 @@ namespace {
     float getInlineFudgeFactor(CallSite CS) {
       return CA.getInlineFudgeFactor(CS);
     }
+    virtual bool doFinalization(CallGraph &CG) { 
+      return removeDeadFunctions(CG, &NeverInline); 
+    }
     virtual bool doInitialization(CallGraph &CG);
   };
 }
diff --git a/lib/Transforms/IPO/Inliner.cpp b/lib/Transforms/IPO/Inliner.cpp
index 2321047..418b2b7 100644
--- a/lib/Transforms/IPO/Inliner.cpp
+++ b/lib/Transforms/IPO/Inliner.cpp
@@ -204,6 +204,13 @@ bool Inliner::runOnSCC(const std::vector<CallGraphNode*> &SCC) {
 // doFinalization - Remove now-dead linkonce functions at the end of
 // processing to avoid breaking the SCC traversal.
 bool Inliner::doFinalization(CallGraph &CG) {
+  return removeDeadFunctions(CG);
+}
+
+  /// removeDeadFunctions - Remove dead functions that are not included in
+  /// DNR (Do Not Remove) list.
+bool Inliner::removeDeadFunctions(CallGraph &CG, 
+                                 SmallPtrSet<const Function *, 16> *DNR) {
   std::set<CallGraphNode*> FunctionsToRemove;
 
   // Scan for all of the functions, looking for ones that should now be removed
@@ -215,6 +222,9 @@ bool Inliner::doFinalization(CallGraph &CG) {
       // them.
       F->removeDeadConstantUsers();
 
+      if (DNR && DNR->count(F))
+        continue;
+
       if ((F->hasLinkOnceLinkage() || F->hasInternalLinkage()) &&
           F->use_empty()) {