[PATCH] D52386: [Lexer] Add udefined_behavior_sanitizer feature

[Leonard Chan via Phabricator via cfe-commits]

leonardchan created this revision.
leonardchan added reviewers: phosek, kcc, echristo, vitalybuka, morehouse.
leonardchan added a project: clang.

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


Repository:
  rC Clang

https://reviews.llvm.org/D52386

Files:
  include/clang/Basic/Features.def
  test/Lexer/has_feature_undefined_behavior_sanitizer.cpp


Index: test/Lexer/has_feature_undefined_behavior_sanitizer.cpp
===================================================================
--- /dev/null
+++ 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
Index: include/clang/Basic/Features.def
===================================================================
--- include/clang/Basic/Features.def
+++ include/clang/Basic/Features.def
@@ -38,6 +38,8 @@
         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)


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