[asan] Added -fsanitize-address-use-after-scope flag

Summary:
Also emit lifetime markers for -fsanitize-address-use-after-scope.
Asan uses life-time markers for use-after-scope check.

PR27453

Reviewers: kcc, eugenis, aizatsky

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D20759

llvm-svn: 271451

1 files changed, 7 insertions, 4 deletions

diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index 0b0b5a7..ac47c99 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -184,7 +184,7 @@ static void addInstructionCombiningPass(const PassManagerBuilder &Builder,
 }
 
 static void addBoundsCheckingPass(const PassManagerBuilder &Builder,
-                                    legacy::PassManagerBase &PM) {
+                                  legacy::PassManagerBase &PM) {
   PM.add(createBoundsCheckingPass());
 }
 
@@ -210,14 +210,17 @@ static void addAddressSanitizerPasses(const PassManagerBuilder &Builder,
       static_cast<const PassManagerBuilderWrapper&>(Builder);
   const CodeGenOptions &CGOpts = BuilderWrapper.getCGOpts();
   bool Recover = CGOpts.SanitizeRecover.has(SanitizerKind::Address);
-  PM.add(createAddressSanitizerFunctionPass(/*CompileKernel*/false, Recover));
+  bool UseAfterScope = CGOpts.SanitizeAddressUseAfterScope;
+  PM.add(createAddressSanitizerFunctionPass(/*CompileKernel*/ false, Recover,
+                                            UseAfterScope));
   PM.add(createAddressSanitizerModulePass(/*CompileKernel*/false, Recover));
 }
 
 static void addKernelAddressSanitizerPasses(const PassManagerBuilder &Builder,
                                             legacy::PassManagerBase &PM) {
-  PM.add(createAddressSanitizerFunctionPass(/*CompileKernel*/true,
-                                            /*Recover*/true));
+  PM.add(createAddressSanitizerFunctionPass(
+      /*CompileKernel*/ true,
+      /*Recover*/ true, /*UseAfterScope*/ false));
   PM.add(createAddressSanitizerModulePass(/*CompileKernel*/true,
                                           /*Recover*/true));
 }