[PATCH] D38063: [MSan] Disable sanitization for __sanitizer_dtor_callback.

[Matt Morehouse via Phabricator via cfe-commits]

morehouse created this revision.
Herald added a subscriber: hiraditya.

Eliminate unnecessary instrumentation at __sanitizer_dtor_callback
call sites.  Fixes https://github.com/google/sanitizers/issues/861.


https://reviews.llvm.org/D38063

Files:
  clang/lib/CodeGen/CGClass.cpp
  llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp


Index: llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
===================================================================
--- llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+++ llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
@@ -2588,6 +2588,7 @@
 
   void visitCallSite(CallSite CS) {
     Instruction &I = *CS.getInstruction();
+    if (I.getMetadata("nosanitize")) return;
     assert((CS.isCall() || CS.isInvoke()) && "Unknown type of CallSite");
     if (CS.isCall()) {
       CallInst *Call = cast<CallInst>(&I);
Index: clang/lib/CodeGen/CGClass.cpp
===================================================================
--- clang/lib/CodeGen/CGClass.cpp
+++ clang/lib/CodeGen/CGClass.cpp
@@ -1588,7 +1588,9 @@
        llvm::FunctionType::get(CGF.VoidTy, ArgTypes, false);
    llvm::Value *Fn =
        CGF.CGM.CreateRuntimeFunction(FnType, "__sanitizer_dtor_callback");
-   CGF.EmitNounwindRuntimeCall(Fn, Args);
+   llvm::CallInst *I = CGF.EmitNounwindRuntimeCall(Fn, Args);
+   I->setMetadata("nosanitize", llvm::MDNode::get(CGF.getLLVMContext(),
+                                                  llvm::None));
  }
 
   class SanitizeDtorMembers final : public EHScopeStack::Cleanup {


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