[clang][rtsan] Introduce realtime sanitizer codegen and driver (#102622)

Introduce the `-fsanitize=realtime` flag in clang driver

Plug in the RealtimeSanitizer PassManager pass in Codegen, and attribute
a function based on if it has the `[[clang::nonblocking]]` function
effect.

1 files changed, 8 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index fdd89ed..026f164 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -78,6 +78,7 @@
 #include "llvm/Transforms/Instrumentation/MemorySanitizer.h"
 #include "llvm/Transforms/Instrumentation/NumericalStabilitySanitizer.h"
 #include "llvm/Transforms/Instrumentation/PGOInstrumentation.h"
+#include "llvm/Transforms/Instrumentation/RealtimeSanitizer.h"
 #include "llvm/Transforms/Instrumentation/SanitizerBinaryMetadata.h"
 #include "llvm/Transforms/Instrumentation/SanitizerCoverage.h"
 #include "llvm/Transforms/Instrumentation/ThreadSanitizer.h"
@@ -990,6 +991,13 @@ void EmitAssemblyHelper::RunOptimizationPipeline(
             FPM.addPass(BoundsCheckingPass());
           });
 
+    if (LangOpts.Sanitize.has(SanitizerKind::Realtime))
+      PB.registerScalarOptimizerLateEPCallback(
+          [](FunctionPassManager &FPM, OptimizationLevel Level) {
+            RealtimeSanitizerOptions Opts;
+            FPM.addPass(RealtimeSanitizerPass(Opts));
+          });
+
     // Don't add sanitizers if we are here from ThinLTO PostLink. That already
     // done on PreLink stage.
     if (!IsThinLTOPostLink) {