[XRay] Add -fxray-{always,never}-instrument= flags to clang

Summary:
The -fxray-always-instrument= and -fxray-never-instrument= flags take
filenames that are used to imbue the XRay instrumentation attributes
using a whitelist mechanism (similar to the sanitizer special cases
list). We use the same syntax and semantics as the sanitizer blacklists
files in the implementation.

As implemented, we respect the attributes that are already defined in
the source file (i.e. those that have the
[[clang::xray_{always,never}_instrument]] attributes) before applying
the always/never instrument lists.

Reviewers: rsmith, chandlerc

Subscribers: jfb, mgorny, cfe-commits

Differential Revision: https://reviews.llvm.org/D30388

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@299041 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 0 deletions

diff --git a/include/clang/Basic/LangOptions.h b/include/clang/Basic/LangOptions.h
index 16abf9b7bb..e684ec1ba9 100644
--- a/include/clang/Basic/LangOptions.h
+++ b/include/clang/Basic/LangOptions.h
@@ -102,6 +102,16 @@ public:
   /// (files, functions, variables) should not be instrumented.
   std::vector<std::string> SanitizerBlacklistFiles;
 
+  /// \brief Paths to the XRay "always instrument" files specifying which
+  /// objects (files, functions, variables) should be imbued with the XRay
+  /// "always instrument" attribute.
+  std::vector<std::string> XRayAlwaysInstrumentFiles;
+
+  /// \brief Paths to the XRay "never instrument" files specifying which
+  /// objects (files, functions, variables) should be imbued with the XRay
+  /// "never instrument" attribute.
+  std::vector<std::string> XRayNeverInstrumentFiles;
+
   clang::ObjCRuntime ObjCRuntime;
 
   std::string ObjCConstantStringClass;