From: Leonard Chan <leonardchan@google.com>
Date: Sat, 22 Sep 2018 01:03:16 +0000 (+0000)
Subject: [Lexer] Add udefined_behavior_sanitizer feature
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d05cbec4c2c7fcf52a428d3253ca0c97662d7285;p=clang

[Lexer] Add udefined_behavior_sanitizer feature

This can be used to detect whether the code is being built with UBSan using
the __has_feature(undefined_behavior_sanitizer) predicate.

Differential Revision: https://reviews.llvm.org/D52386

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@342793 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/clang/Basic/Features.def b/include/clang/Basic/Features.def
index f816d1894e..0061135be6 100644
--- a/include/clang/Basic/Features.def
+++ b/include/clang/Basic/Features.def
@@ -38,6 +38,8 @@ FEATURE(hwaddress_sanitizer,
         LangOpts.Sanitize.hasOneOf(SanitizerKind::HWAddress |
                                    SanitizerKind::KernelHWAddress))
 FEATURE(xray_instrument, LangOpts.XRayInstrument)
+FEATURE(undefined_behavior_sanitizer,
+        LangOpts.Sanitize.hasOneOf(SanitizerKind::Undefined))
 FEATURE(assume_nonnull, true)
 FEATURE(attribute_analyzer_noreturn, true)
 FEATURE(attribute_availability, true)
diff --git a/test/Lexer/has_feature_undefined_behavior_sanitizer.cpp b/test/Lexer/has_feature_undefined_behavior_sanitizer.cpp
new file mode 100644
index 0000000000..62e5316dde
--- /dev/null
+++ b/test/Lexer/has_feature_undefined_behavior_sanitizer.cpp
@@ -0,0 +1,13 @@
+// RUN: %clang -E -fsanitize=undefined %s -o - | FileCheck --check-prefix=CHECK-UBSAN %s
+// RUN: %clang -E -fsanitize=alignment %s -o - | FileCheck --check-prefix=CHECK-ALIGNMENT %s
+// RUN: %clang -E  %s -o - | FileCheck --check-prefix=CHECK-NO-UBSAN %s
+
+#if __has_feature(undefined_behavior_sanitizer)
+int UBSanEnabled();
+#else
+int UBSanDisabled();
+#endif
+
+// CHECK-UBSAN: UBSanEnabled
+// CHECK-ALIGNMENT: UBSanEnabled
+// CHECK-NO-UBSAN: UBSanDisabled