[ubsan] PR33081: Skip the standard type checks for volatile
Skip checks for null dereference, alignment violation, object size
violation, and dynamic type violation if the pointer points to volatile
data.
Differential Revision: https://reviews.llvm.org/D34262
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@305546 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit ff94b5e7fe537029dd2a96c48198b1bcb27b0958)
diff --git a/lib/CodeGen/CGExpr.cpp b/lib/CodeGen/CGExpr.cpp
index e46fe21..f7e4272 100644
--- a/lib/CodeGen/CGExpr.cpp
+++ b/lib/CodeGen/CGExpr.cpp
@@ -545,6 +545,11 @@
if (Ptr->getType()->getPointerAddressSpace())
return;
+ // Don't check pointers to volatile data. The behavior here is implementation-
+ // defined.
+ if (Ty.isVolatileQualified())
+ return;
+
SanitizerScope SanScope(this);
SmallVector<std::pair<llvm::Value *, SanitizerMask>, 3> Checks;
diff --git a/test/CodeGen/ubsan-volatile.c b/test/CodeGen/ubsan-volatile.c
new file mode 100644
index 0000000..ce54aad
--- /dev/null
+++ b/test/CodeGen/ubsan-volatile.c
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fsanitize=null,alignment,object-size,vptr -S -emit-llvm %s -o - | FileCheck %s
+
+// CHECK: @volatile_null_deref
+void volatile_null_deref(volatile int *p) {
+ // CHECK-NOT: call{{.*}}ubsan
+ *p;
+}
