[asan] extend the blacklist functionality to handle global-init. Patch by Reid Watson

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163199 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Instrumentation/AddressSanitizer.cpp

@@ -544,6 +544,7 @@ bool AddressSanitizer::ShouldInstrumentGlobal(GlobalVariable *G) {
   Type *Ty = cast<PointerType>(G->getType())->getElementType();
   DEBUG(dbgs() << "GLOBAL: " << *G);
 
+  if (BL->isIn(*G)) return false;
   if (!Ty->isSized()) return false;
   if (!G->hasInitializer()) return false;
   // Touch only those globals that will not be defined in other modules.
@@ -643,6 +644,8 @@ bool AddressSanitizer::insertGlobalRedzones(Module &M) {
     Type *RightRedZoneTy = ArrayType::get(IRB.getInt8Ty(), RightRedzoneSize);
     // Determine whether this global should be poisoned in initialization.
     bool GlobalHasDynamicInitializer = HasDynamicInitializer(G);
+    // Don't check initialization order if this global is blacklisted.
+    GlobalHasDynamicInitializer &= ! BL->isInInit(*G);
 
     StructType *NewTy = StructType::get(Ty, RightRedZoneTy, NULL);
     Constant *NewInitializer = ConstantStruct::get(

lib/Transforms/Instrumentation/BlackList.cpp

@@ -89,6 +89,10 @@ bool BlackList::isIn(const Module &M) {
   return inSection("src", M.getModuleIdentifier());
 }
 
+bool BlackList::isInInit(const GlobalVariable &G) {
+  return isIn(*G.getParent()) || inSection("global-init", G.getName());
+}
+
 bool BlackList::inSection(const StringRef Section,
                                   const StringRef Query) {
   Regex *FunctionRegex = Entries[Section];

lib/Transforms/Instrumentation/BlackList.h

@@ -14,7 +14,8 @@
 // variables.  Each line contains a prefix, followed by a wild card expression.
 // ---
 // fun:*_ZN4base6subtle*
-// global:*global_with_initialization_problems*
+// global:*global_with_bad_access_or_initialization*
+// global-init:*global_with_initialization_issues*
 // src:file_with_tricky_code.cc
 // ---
 // Note that the wild card is in fact an llvm::Regex, but * is automatically
@@ -43,6 +44,8 @@ class BlackList {
   bool isIn(const GlobalVariable &G);
   // Returns whether this module is blacklisted by filename.
   bool isIn(const Module &M);
+  // Returns whether a global should be excluded from initialization checking.
+  bool isInInit(const GlobalVariable &G);
  private:
   StringMap<Regex*> Entries;