[PATCH] D156618: [IR] Fix a memory leak if Function::dropAllReferences() is followed by setHungoffOperand

[Liqiang Tao via Phabricator via llvm-commits]

taolq updated this revision to Diff 555716.
taolq retitled this revision from "[IR] Fix a memory leak if Function::dropAllReferences() is followed by setHungoffOperand " to "[IR] Fix a memory leak if Function::dropAllReferences() is followed by setHungoffOperand".
taolq added a comment.

rebase to main


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D156618/new/

https://reviews.llvm.org/D156618

Files:
  llvm/lib/IR/Function.cpp


Index: llvm/lib/IR/Function.cpp
===================================================================
--- llvm/lib/IR/Function.cpp
+++ llvm/lib/IR/Function.cpp
@@ -539,8 +539,10 @@
 
   // Drop uses of any optional data (real or placeholder).
   if (getNumOperands()) {
-    User::dropAllReferences();
-    setNumHungOffUseOperands(0);
+    auto *CPN = ConstantPointerNull::get(Type::getInt1PtrTy(getContext(), 0));
+    Op<0>().set(CPN);
+    Op<1>().set(CPN);
+    Op<2>().set(CPN);
     setValueSubclassData(getSubclassDataFromValue() & ~0xe);
   }
 


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