Introduce a SanitizerKind enum to LangOptions.

Use the bitmask to store the set of enabled sanitizers instead of a
bitfield. On the negative side, it makes syntax for querying the
set of enabled sanitizers a bit more clunky. On the positive side, we
will be able to use SanitizerKind to eventually implement the
new semantics for -fsanitize-recover= flag, that would allow us
to make some sanitizers recoverable, and some non-recoverable.

No functionality change.

llvm-svn: 221558

clang/lib/CodeGen/CodeGenFunction.cpp

@@ -604,7 +604,7 @@ void CodeGenFunction::StartFunction(GlobalDecl GD,
 
   // If we are checking function types, emit a function type signature as
   // prefix data.
-  if (getLangOpts().CPlusPlus && SanOpts.Function) {
+  if (getLangOpts().CPlusPlus && SanOpts.has(SanitizerKind::Function)) {
     if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
       if (llvm::Constant *PrefixSig =
               CGM.getTargetCodeGenInfo().getUBSanFunctionSignature(CGM)) {
@@ -897,7 +897,7 @@ void CodeGenFunction::GenerateCode(GlobalDecl GD, llvm::Function *Fn,
   //   function call is used by the caller, the behavior is undefined.
   if (getLangOpts().CPlusPlus && !FD->hasImplicitReturnZero() && !SawAsmBlock &&
       !FD->getReturnType()->isVoidType() && Builder.GetInsertBlock()) {
-    if (SanOpts.Return) {
+    if (SanOpts.has(SanitizerKind::Return)) {
       SanitizerScope SanScope(this);
       EmitCheck(Builder.getFalse(), "missing_return",
                 EmitCheckSourceLocation(FD->getLocation()),
@@ -1552,7 +1552,7 @@ void CodeGenFunction::EmitVariablyModifiedType(QualType type) {
           //   If the size is an expression that is not an integer constant
           //   expression [...] each time it is evaluated it shall have a value
           //   greater than zero.
-          if (SanOpts.VLABound &&
+          if (SanOpts.has(SanitizerKind::VLABound) &&
               size->getType()->isSignedIntegerType()) {
             SanitizerScope SanScope(this);
             llvm::Value *Zero = llvm::Constant::getNullValue(Size->getType());