[asan] If we are compiling with ASan, add metadata indicating dynamically initialized globals. Patch by Reid Watson, reviewed by Richard Smith
llvm-svn: 162259
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 3ae3c52..840a18e 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -1682,6 +1682,18 @@
if (NeedsGlobalCtor || NeedsGlobalDtor)
EmitCXXGlobalVarDeclInitFunc(D, GV, NeedsGlobalCtor);
+ // If we are compiling with ASan, add metadata indicating dynamically
+ // initialized globals.
+ if (LangOpts.AddressSanitizer && NeedsGlobalCtor) {
+ llvm::Module &M = getModule();
+
+ llvm::NamedMDNode *DynamicInitializers =
+ M.getOrInsertNamedMetadata("llvm.asan.dynamically_initialized_globals");
+ llvm::Value *GlobalToAdd[] = { GV };
+ llvm::MDNode *ThisGlobal = llvm::MDNode::get(VMContext, GlobalToAdd);
+ DynamicInitializers->addOperand(ThisGlobal);
+ }
+
// Emit global variable debug information.
if (CGDebugInfo *DI = getModuleDebugInfo())
if (getCodeGenOpts().DebugInfo >= CodeGenOptions::LimitedDebugInfo)