Revert "[misexpect] Re-implement MisExpect Diagnostics"

This reverts commit 2add3fb.

clang/docs/ReleaseNotes.rst

@@ -105,9 +105,6 @@ Improvements to Clang's diagnostics
 - ``-Wunused-but-set-variable`` now also warns if the variable is only used
   by unary operators.
 
-- ``-Wmisexpect`` warns when the branch weights collected during profiling
-  conflict with those added by ``llvm.expect``.
-
 Non-comprehensive list of changes in this release
 -------------------------------------------------
 - The builtin function __builtin_dump_struct would crash clang when the target 

clang/include/clang/Basic/CodeGenOptions.def

@@ -175,7 +175,6 @@ CODEGENOPT(NoExecStack       , 1, 0) ///< Set when -Wa,--noexecstack is enabled.
 CODEGENOPT(FatalWarnings     , 1, 0) ///< Set when -Wa,--fatal-warnings is
                                      ///< enabled.
 CODEGENOPT(NoWarn            , 1, 0) ///< Set when -Wa,--no-warn is enabled.
-CODEGENOPT(MisExpect         , 1, 0) ///< Set when -Wmisexpect is enabled
 CODEGENOPT(EnableSegmentedStacks , 1, 0) ///< Set when -fsplit-stack is enabled.
 CODEGENOPT(NoInlineLineTables, 1, 0) ///< Whether debug info should contain
                                      ///< inline line tables.

clang/include/clang/Basic/CodeGenOptions.h

@@ -420,10 +420,6 @@ class CodeGenOptions : public CodeGenOptionsBase {
   /// If threshold option is not specified, it is disabled by default.
   Optional<uint64_t> DiagnosticsHotnessThreshold = 0;
 
-  /// The maximum percentage profiling weights can deviate from the expected
-  /// values in order to be included in misexpect diagnostics.
-  Optional<uint64_t> DiagnosticsMisExpectTolerance = 0;
-
 public:
   // Define accessors/mutators for code generation options of enumeration type.
 #define CODEGENOPT(Name, Bits, Default)

clang/include/clang/Basic/DiagnosticDriverKinds.td

@@ -149,8 +149,6 @@ def err_drv_invalid_darwin_version : Error<
   "invalid Darwin version number: %0">;
 def err_drv_invalid_diagnotics_hotness_threshold : Error<
   "invalid argument in '%0', only integer or 'auto' is supported">;
-def err_drv_invalid_diagnotics_misexpect_tolerance : Error<
-  "invalid argument in '%0', only integers are supported">;
 def err_drv_missing_argument : Error<
   "argument to '%0' is missing (expected %1 value%s1)">;
 def err_drv_invalid_Xarch_argument_with_args : Error<
@@ -378,9 +376,6 @@ def warn_drv_empty_joined_argument : Warning<
 def warn_drv_diagnostics_hotness_requires_pgo : Warning<
   "argument '%0' requires profile-guided optimization information">,
   InGroup<UnusedCommandLineArgument>;
-def warn_drv_diagnostics_misexpect_requires_pgo : Warning<
-  "argument '%0' requires profile-guided optimization information">,
-  InGroup<UnusedCommandLineArgument>;
 def warn_drv_clang_unsupported : Warning<
   "the clang compiler does not support '%0'">;
 def warn_drv_deprecated_arg : Warning<

clang/include/clang/Basic/DiagnosticFrontendKinds.td

@@ -311,11 +311,6 @@ def warn_profile_data_missing : Warning<
 def warn_profile_data_unprofiled : Warning<
   "no profile data available for file \"%0\"">,
   InGroup<ProfileInstrUnprofiled>;
-def warn_profile_data_misexpect : Warning<
-  "Potential performance regression from use of __builtin_expect(): "
-  "Annotation was correct on %0 of profiled executions.">,
-  BackendInfo,
-  InGroup<MisExpect>;
 } // end of instrumentation issue category
 
 }

clang/include/clang/Basic/DiagnosticGroups.td

@@ -1254,7 +1254,6 @@ def BackendWarningAttributes : DiagGroup<"attribute-warning">;
 def ProfileInstrMissing : DiagGroup<"profile-instr-missing">;
 def ProfileInstrOutOfDate : DiagGroup<"profile-instr-out-of-date">;
 def ProfileInstrUnprofiled : DiagGroup<"profile-instr-unprofiled">;
-def MisExpect : DiagGroup<"misexpect">;
 
 // AddressSanitizer frontend instrumentation remarks.
 def SanitizeAddressRemarks : DiagGroup<"sanitize-address">;

clang/include/clang/Driver/Options.td

@@ -1426,9 +1426,6 @@ def fdiagnostics_hotness_threshold_EQ : Joined<["-"], "fdiagnostics-hotness-thre
     Group<f_Group>, Flags<[CC1Option]>, MetaVarName<"<value>">,
     HelpText<"Prevent optimization remarks from being output if they do not have at least this profile count. "
     "Use 'auto' to apply the threshold from profile summary">;
-def fdiagnostics_misexpect_tolerance_EQ : Joined<["-"], "fdiagnostics-misexpect-tolerance=">,
-    Group<f_Group>, Flags<[CC1Option]>, MetaVarName<"<value>">,
-    HelpText<"Prevent misexpect diagnostics from being output if the profile counts are within N% of the expected. ">;
 defm diagnostics_show_option : BoolFOption<"diagnostics-show-option",
     DiagnosticOpts<"ShowOptionNames">, DefaultTrue,
     NegFlag<SetFalse, [CC1Option]>, PosFlag<SetTrue, [], "Print option name with mappable diagnostics">>;

clang/lib/CodeGen/BackendUtil.cpp

@@ -650,7 +650,6 @@ static bool initTargetOptions(DiagnosticsEngine &Diags,
           Entry.IgnoreSysRoot ? Entry.Path : HSOpts.Sysroot + Entry.Path);
   Options.MCOptions.Argv0 = CodeGenOpts.Argv0;
   Options.MCOptions.CommandLineArgs = CodeGenOpts.CommandLineArgs;
-  Options.MisExpect = CodeGenOpts.MisExpect;
 
   return true;
 }

clang/lib/CodeGen/CodeGenAction.cpp

@@ -340,15 +340,6 @@ namespace clang {
           CodeGenOpts.getProfileUse() != CodeGenOptions::ProfileNone)
         Ctx.setDiagnosticsHotnessRequested(true);
 
-      if (CodeGenOpts.MisExpect) {
-        Ctx.setMisExpectWarningRequested(true);
-      }
-
-      if (CodeGenOpts.DiagnosticsMisExpectTolerance) {
-        Ctx.setDiagnosticsMisExpectTolerance(
-            CodeGenOpts.DiagnosticsMisExpectTolerance);
-      }
-
       // Link each LinkModule into our module.
       if (LinkInModules())
         return;
@@ -449,9 +440,6 @@ namespace clang {
     void OptimizationFailureHandler(
         const llvm::DiagnosticInfoOptimizationFailure &D);
     void DontCallDiagHandler(const DiagnosticInfoDontCall &D);
-    /// Specialized handler for misexpect warnings.
-    /// Note that misexpect remarks are emitted through ORE
-    void MisExpectDiagHandler(const llvm::DiagnosticInfoMisExpect &D);
   };
 
   void BackendConsumer::anchor() {}
@@ -833,25 +821,6 @@ void BackendConsumer::DontCallDiagHandler(const DiagnosticInfoDontCall &D) {
       << llvm::demangle(D.getFunctionName().str()) << D.getNote();
 }
 
-void BackendConsumer::MisExpectDiagHandler(
-    const llvm::DiagnosticInfoMisExpect &D) {
-  StringRef Filename;
-  unsigned Line, Column;
-  bool BadDebugInfo = false;
-  FullSourceLoc Loc =
-      getBestLocationFromDebugLoc(D, BadDebugInfo, Filename, Line, Column);
-
-  Diags.Report(Loc, diag::warn_profile_data_misexpect) << D.getMsg().str();
-
-  if (BadDebugInfo)
-    // If we were not able to translate the file:line:col information
-    // back to a SourceLocation, at least emit a note stating that
-    // we could not translate this location. This can happen in the
-    // case of #line directives.
-    Diags.Report(Loc, diag::note_fe_backend_invalid_loc)
-        << Filename << Line << Column;
-}
-
 /// This function is invoked when the backend needs
 /// to report something to the user.
 void BackendConsumer::DiagnosticHandlerImpl(const DiagnosticInfo &DI) {
@@ -926,9 +895,6 @@ void BackendConsumer::DiagnosticHandlerImpl(const DiagnosticInfo &DI) {
   case llvm::DK_DontCall:
     DontCallDiagHandler(cast<DiagnosticInfoDontCall>(DI));
     return;
-  case llvm::DK_MisExpect:
-    MisExpectDiagHandler(cast<DiagnosticInfoMisExpect>(DI));
-    return;
   default:
     // Plugin IDs are not bound to any value as they are set dynamically.
     ComputeDiagRemarkID(Severity, backend_plugin, DiagID);

clang/lib/Frontend/CompilerInvocation.cpp

@@ -106,20 +106,6 @@ using namespace driver;
 using namespace options;
 using namespace llvm::opt;
 
-//===----------------------------------------------------------------------===//
-// Helpers.
-//===----------------------------------------------------------------------===//
-
-// Parse misexpect tolerance argument value.
-// Valid option values are integers in the range [0, 100)
-inline Expected<Optional<uint64_t>> parseToleranceOption(StringRef Arg) {
-  int64_t Val;
-  if (Arg.getAsInteger(10, Val))
-    return llvm::createStringError(llvm::inconvertibleErrorCode(),
-                                   "Not an integer: %s", Arg.data());
-  return Val;
-}
-
 //===----------------------------------------------------------------------===//
 // Initialization.
 //===----------------------------------------------------------------------===//
@@ -1549,9 +1535,6 @@ void CompilerInvocation::GenerateCodeGenArgs(
                   : "auto",
               SA);
 
-  GenerateArg(Args, OPT_fdiagnostics_misexpect_tolerance_EQ,
-              Twine(*Opts.DiagnosticsMisExpectTolerance), SA);
-
   for (StringRef Sanitizer : serializeSanitizerKinds(Opts.SanitizeRecover))
     GenerateArg(Args, OPT_fsanitize_recover_EQ, Sanitizer, SA);
 
@@ -1969,23 +1952,6 @@ bool CompilerInvocation::ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args,
     }
   }
 
-  if (auto *arg =
-          Args.getLastArg(options::OPT_fdiagnostics_misexpect_tolerance_EQ)) {
-    auto ResultOrErr = parseToleranceOption(arg->getValue());
-
-    if (!ResultOrErr) {
-      Diags.Report(diag::err_drv_invalid_diagnotics_misexpect_tolerance)
-          << "-fdiagnostics-misexpect-tolerance=";
-    } else {
-      Opts.DiagnosticsMisExpectTolerance = *ResultOrErr;
-      if ((!Opts.DiagnosticsMisExpectTolerance.hasValue() ||
-           Opts.DiagnosticsMisExpectTolerance.getValue() > 0) &&
-          !UsingProfile)
-        Diags.Report(diag::warn_drv_diagnostics_misexpect_requires_pgo)
-            << "-fdiagnostics-misexpect-tolerance=";
-    }
-  }
-
   // If the user requested to use a sample profile for PGO, then the
   // backend will need to track source location information so the profile
   // can be incorporated into the IR.
@@ -4611,13 +4577,6 @@ bool CompilerInvocation::CreateFromArgsImpl(
   if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
     LangOpts.ObjCExceptions = 1;
 
-  for (auto Warning : Res.getDiagnosticOpts().Warnings) {
-    if (Warning == "misexpect" &&
-        !Diags.isIgnored(diag::warn_profile_data_misexpect, SourceLocation())) {
-      Res.getCodeGenOpts().MisExpect = true;
-    }
-  }
-
   if (LangOpts.CUDA) {
     // During CUDA device-side compilation, the aux triple is the
     // triple used for host compilation.