CFI: Introduce -fsanitize=cfi-icall flag.

This flag causes the compiler to emit bit set entries for functions as well
as runtime bitset checks at indirect call sites. Depends on the new function
bitset mechanism.

Differential Revision: http://reviews.llvm.org/D11857

llvm-svn: 247238

1 files changed, 23 insertions, 0 deletions

diff --git a/clang/test/CodeGenCXX/cfi-icall.cpp b/clang/test/CodeGenCXX/cfi-icall.cpp
new file mode 100644
index 00000000000..eceb92a4421
--- /dev/null
+++ b/clang/test/CodeGenCXX/cfi-icall.cpp
@@ -0,0 +1,23 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-linux -fsanitize=cfi-icall -fsanitize-trap=cfi-icall -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=ITANIUM %s
+// RUN: %clang_cc1 -triple x86_64-pc-windows-msvc -fsanitize=cfi-icall -fsanitize-trap=cfi-icall -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=MS %s
+
+// Tests that we assign unnamed metadata nodes to functions whose types have
+// internal linkage.
+
+namespace {
+
+struct S {};
+
+void f(S *s) {
+}
+
+}
+
+void g() {
+  void (*fp)(S *) = f;
+  // CHECK: call i1 @llvm.bitset.test(i8* {{.*}}, metadata ![[VOIDS:[0-9]+]])
+  fp(0);
+}
+
+// ITANIUM: !{![[VOIDS]], void (%"struct.(anonymous namespace)::S"*)* @_ZN12_GLOBAL__N_11fEPNS_1SE, i64 0}
+// MS: !{![[VOIDS]], void (%"struct.(anonymous namespace)::S"*)* @"\01?f@?A@@YAXPEAUS@?A@@@Z", i64 0}