[Lexer] Add xray_instrument feature

This can be used to detect whether the code is being built with XRay
instrumentation using the __has_feature(xray_instrument) predicate.

Differential Revision: https://reviews.llvm.org/D52159

llvm-svn: 342358

diff --git a/clang/include/clang/Basic/Features.def b/clang/include/clang/Basic/Features.def
index 05c5a5b..f816d18 100644 (file)
--- a/clang/include/clang/Basic/Features.def
+++ b/clang/include/clang/Basic/Features.def
@@ -37,6 +37,7 @@ FEATURE(address_sanitizer,
 FEATURE(hwaddress_sanitizer,
         LangOpts.Sanitize.hasOneOf(SanitizerKind::HWAddress |
                                    SanitizerKind::KernelHWAddress))
+FEATURE(xray_instrument, LangOpts.XRayInstrument)
 FEATURE(assume_nonnull, true)
 FEATURE(attribute_analyzer_noreturn, true)
 FEATURE(attribute_availability, true)

diff --git a/clang/test/Lexer/has_feature_xray_instrument.cpp b/clang/test/Lexer/has_feature_xray_instrument.cpp
new file mode 100644 (file)
index 0000000..cd2750d
--- /dev/null
+++ b/clang/test/Lexer/has_feature_xray_instrument.cpp
@@ -0,0 +1,11 @@
+// RUN: %clang_cc1 -E -fxray-instrument %s -o - | FileCheck --check-prefix=CHECK-XRAY %s
+// RUN: %clang_cc1 -E  %s -o - | FileCheck --check-prefix=CHECK-NO-XRAY %s
+
+#if __has_feature(xray_instrument)
+int XRayInstrumentEnabled();
+#else
+int XRayInstrumentDisabled();
+#endif
+
+// CHECK-XRAY: XRayInstrumentEnabled
+// CHECK-NO-XRAY: XRayInstrumentDisabled