Revert "[clang][rtsan] Introduce realtime sanitizer codegen and drive… (#105744)

…r (#102622)"

This reverts commit d010ec6.

Build failure: https://lab.llvm.org/buildbot/#/builders/159/builds/4466

Author: cjappl

clang/docs/RealtimeSanitizer.rst

@@ -454,11 +454,6 @@ Moved checkers
 
 Sanitizers
 ----------
-- Introduced Realtime Sanitizer, activated by using the -fsanitize=realtime
-  flag. This sanitizer detects unsafe system library calls, such as memory
-  allocations and mutex locks. If any such function is called during invocation
-  of a function marked with the ``[[clang::nonblocking]]`` attribute, an error
-  is printed to the console and the process exits non-zero.
 
 - Added the ``-fsanitize-undefined-ignore-overflow-pattern`` flag which can be
   used to disable specific overflow-dependent code patterns. The supported

clang/docs/ReleaseNotes.rst

@@ -2068,8 +2068,6 @@ are listed below.
       integrity.
    -  ``-fsanitize=safe-stack``: :doc:`safe stack <SafeStack>`
       protection against stack-based memory corruption errors.
-   -  ``-fsanitize=realtime``: :doc:`RealtimeSanitizer`,
-      a real-time safety checker.
 
    There are more fine-grained checks available: see
    the :ref:`list <ubsan-checks>` of specific kinds of

clang/docs/UsersManual.rst

@@ -32,7 +32,6 @@ Using Clang as a Compiler
    UndefinedBehaviorSanitizer
    DataFlowSanitizer
    LeakSanitizer
-   RealtimeSanitizer
    SanitizerCoverage
    SanitizerStats
    SanitizerSpecialCaseList

clang/docs/index.rst

@@ -79,9 +79,6 @@ SANITIZER("thread", Thread)
 // Numerical stability sanitizer.
 SANITIZER("numerical", NumericalStability)
 
-// RealtimeSanitizer
-SANITIZER("realtime", Realtime)
-
 // LeakSanitizer
 SANITIZER("leak", Leak)
 

clang/include/clang/Basic/Sanitizers.def

@@ -107,7 +107,6 @@ class SanitizerArgs {
   bool needsNsanRt() const {
     return Sanitizers.has(SanitizerKind::NumericalStability);
   }
-  bool needsRtsanRt() const { return Sanitizers.has(SanitizerKind::Realtime); }
 
   bool hasMemTag() const {
     return hasMemtagHeap() || hasMemtagStack() || hasMemtagGlobals();

clang/include/clang/Driver/SanitizerArgs.h

@@ -78,7 +78,6 @@
 #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"
@@ -991,13 +990,6 @@ 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) {

clang/lib/CodeGen/BackendUtil.cpp

@@ -845,13 +845,6 @@ void CodeGenFunction::StartFunction(GlobalDecl GD, QualType RetTy,
   if (SanOpts.has(SanitizerKind::ShadowCallStack))
     Fn->addFnAttr(llvm::Attribute::ShadowCallStack);
 
-  if (SanOpts.has(SanitizerKind::Realtime))
-    if (FD && FD->getASTContext().hasAnyFunctionEffects())
-      for (const FunctionEffectWithCondition &Fe : FD->getFunctionEffects()) {
-        if (Fe.Effect.kind() == FunctionEffect::Kind::NonBlocking)
-          Fn->addFnAttr(llvm::Attribute::SanitizeRealtime);
-      }
-
   // Apply fuzzing attribute to the function.
   if (SanOpts.hasOneOf(SanitizerKind::Fuzzer | SanitizerKind::FuzzerNoLink))
     Fn->addFnAttr(llvm::Attribute::OptForFuzzing);

clang/lib/CodeGen/CodeGenFunction.cpp

@@ -558,15 +558,11 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
                          SanitizerKind::Leak | SanitizerKind::Thread |
                          SanitizerKind::Memory | SanitizerKind::KernelAddress |
                          SanitizerKind::Scudo | SanitizerKind::SafeStack),
-      std::make_pair(SanitizerKind::MemTag, SanitizerKind::Address |
-                                                SanitizerKind::KernelAddress |
-                                                SanitizerKind::HWAddress |
-                                                SanitizerKind::KernelHWAddress),
-      std::make_pair(SanitizerKind::KCFI, SanitizerKind::Function),
-      std::make_pair(SanitizerKind::Realtime,
-                     SanitizerKind::Address | SanitizerKind::Thread |
-                         SanitizerKind::Undefined | SanitizerKind::Memory)};
-
+      std::make_pair(SanitizerKind::MemTag,
+                     SanitizerKind::Address | SanitizerKind::KernelAddress |
+                         SanitizerKind::HWAddress |
+                         SanitizerKind::KernelHWAddress),
+      std::make_pair(SanitizerKind::KCFI, SanitizerKind::Function)};
   // Enable toolchain specific default sanitizers if not explicitly disabled.
   SanitizerMask Default = TC.getDefaultSanitizers() & ~AllRemove;
 

clang/lib/Driver/SanitizerArgs.cpp

@@ -1456,8 +1456,6 @@ collectSanitizerRuntimes(const ToolChain &TC, const ArgList &Args,
       if (!Args.hasArg(options::OPT_shared))
         HelperStaticRuntimes.push_back("hwasan-preinit");
     }
-    if (SanArgs.needsRtsanRt() && SanArgs.linkRuntimes())
-      SharedRuntimes.push_back("rtsan");
   }
 
   // The stats_client library is also statically linked into DSOs.
@@ -1483,10 +1481,6 @@ collectSanitizerRuntimes(const ToolChain &TC, const ArgList &Args,
       StaticRuntimes.push_back("asan_cxx");
   }
 
-  if (!SanArgs.needsSharedRt() && SanArgs.needsRtsanRt() &&
-      SanArgs.linkRuntimes())
-    StaticRuntimes.push_back("rtsan");
-
   if (!SanArgs.needsSharedRt() && SanArgs.needsMemProfRt()) {
     StaticRuntimes.push_back("memprof");
     if (SanArgs.linkCXXRuntimes())