[XRay] Add clang builtin for xray typed events.

[kpw]

Summary

A clang builtin for xray typed events. Differs from
__xray_customevent(...) by the presence of a type tag that is vended by
compiler-rt in typical usage. This allows xray handlers to expand logged
events with their type description and plugins to process traced events
based on type.

This change depends on D45633 for the intrinsic definition.

[kpw]

Adding a comment to the test to encourage getting the event types from
compiler-rt

[dberris]

Thanks, Keith -- we're going to need to add this to the list of instrumentation points we can enable/disable through flags.

lib/CodeGen/CGBuiltin.cpp

3376–3377

Please define a new XRayInstrKind:: for Typed instead of re-using Custom. This allows us to provide finer-grained control on the enabling/disabling of specific flags.

See clang/include/clang/Basic/XRayInstr.h on adding new values to XRayInstrKind and clang/lib/Basic/XRayInstr.cpp in supporting the new value when parsing from -fxray-instrumentation-bundle=. Also, you may need to update XRayArgs.{h,cpp} to teach it to understand how to parse the 'typed' flag value.

[kpw]

test/CodeGen/xray-typedevent.cpp

11

FYI: It would be involved to match on more than * for the event type because the actual IR does things like unsigned extension and truncation to i16. The IR looked sane to me though. It's a shame the BuiltIns.def type attributes are defined in terms like short, half, and size_t rather than fixed width types. /shrug

[kpw]

Added flags and bundle options.

[kpw]

My editor got a bit carried away with automatically clang-formatting lib/CodeGen/CodeGenFunction.cpp. I'll fix that so that I'm not messing up the revision history.

[dberris]

In D45716#1069557, @kpw wrote:

My editor got a bit carried away with automatically clang-formatting lib/CodeGen/CodeGenFunction.cpp. I'll fix that so that I'm not messing up the revision history.

Yes please. :)

Also, if you can add to the tests for instrumentation bundles in test/Driver/XRay/... to ensure that we're properly not seeing the typed events there either, that would be great.

[dberris]

In D45716#1069567, @dberris wrote:

In D45716#1069557, @kpw wrote:

My editor got a bit carried away with automatically clang-formatting lib/CodeGen/CodeGenFunction.cpp. I'll fix that so that I'm not messing up the revision history.

Yes please. :)

Also, if you can add to the tests for instrumentation bundles in test/Driver/XRay/... to ensure that we're properly not seeing the typed events there either, that would be great.

Actually, I see that change too. Ignore that. :)

LGTM (pending the revert of formatting changes in lib/CodeGen/CodeGenFunction.cpp).

[kpw]

Undoing formatting change.

include/clang/Basic/Builtins.def

 BUILTIN(__builtin_os_log_format_buffer_size, "zcC*.", "p:0:nut")
 BUILTIN(__builtin_os_log_format, "v*v*cC*.", "p:0:nt")
 
 // OpenMP 4.0
 LANGBUILTIN(omp_is_initial_device, "i", "nc", OMP_LANG)
 
 // Builtins for XRay
 BUILTIN(__xray_customevent, "vcC*z", "")
+BUILTIN(__xray_typedevent, "vzcC*z", "")
 
 // Win64-compatible va_list functions
 BUILTIN(__builtin_ms_va_start, "vc*&.", "nt")
 BUILTIN(__builtin_ms_va_end, "vc*&", "n")
 BUILTIN(__builtin_ms_va_copy, "vc*&c*&", "n")
 
 #undef BUILTIN
 #undef LIBBUILTIN
 #undef LANGBUILTIN

include/clang/Basic/LangOptions.def

 LANGOPT(SanitizeAddressFieldPadding, 2, 0, "controls how aggressive is ASan "
                                            "field padding (0: none, 1:least "
                                            "aggressive, 2: more aggressive)")
 
 LANGOPT(XRayInstrument, 1, 0, "controls whether to do XRay instrumentation")
 LANGOPT(XRayAlwaysEmitCustomEvents, 1, 0,
         "controls whether to always emit intrinsic calls to "
         "__xray_customevent(...) builtin.")
+LANGOPT(XRayAlwaysEmitTypedEvents, 1, 0,
+        "controls whether to always emit intrinsic calls to "
+        "__xray_typedevent(...) builtin.")
 
 BENIGN_LANGOPT(AllowEditorPlaceholders, 1, 0,
                "allow editor placeholders in source")
 
 ENUM_LANGOPT(ClangABICompat, ClangABI, 4, ClangABI::Latest,
              "version of Clang that we should attempt to be ABI-compatible "
              "with")
 
 #undef LANGOPT
 #undef COMPATIBLE_LANGOPT
 #undef BENIGN_LANGOPT
 #undef ENUM_LANGOPT
 #undef COMPATIBLE_ENUM_LANGOPT
 #undef BENIGN_ENUM_LANGOPT
 #undef VALUE_LANGOPT
 #undef COMPATIBLE_VALUE_LANGOPT
 #undef BENIGN_VALUE_LANGOPT
-

include/clang/Basic/XRayInstr.h

 using XRayInstrMask = uint32_t;
 
 namespace XRayInstrKind {
 
 // TODO: Auto-generate these as we add more instrumentation kinds.
 enum XRayInstrOrdinal : XRayInstrMask {
   XRIO_Function,
   XRIO_Custom,
+  XRIO_Typed,
   XRIO_Count
 };
 
 constexpr XRayInstrMask None = 0;
 constexpr XRayInstrMask Function = 1U << XRIO_Function;
 constexpr XRayInstrMask Custom = 1U << XRIO_Custom;
-constexpr XRayInstrMask All = Function | Custom;
+constexpr XRayInstrMask Typed = 1U << XRIO_Typed;
+constexpr XRayInstrMask All = Function | Custom | Typed;
 
 } // namespace XRayInstrKind
 
 struct XRayInstrSet {
   bool has(XRayInstrMask K) const {
     assert(llvm::isPowerOf2_32(K));
     return Mask & K;
   }

include/clang/Driver/Options.td

def fxray_modes :
   HelpText<"List of modes to link in by default into XRay instrumented binaries.">;
 
 def fxray_always_emit_customevents : Flag<["-"], "fxray-always-emit-customevents">, Group<f_Group>,
   Flags<[CC1Option]>,
   HelpText<"Determine whether to always emit __xray_customevent(...) calls even if the function it appears in is not always instrumented.">;
 def fnoxray_always_emit_customevents : Flag<["-"], "fno-xray-always-emit-customevents">, Group<f_Group>,
   Flags<[CC1Option]>;
 
+def fxray_always_emit_typedevents : Flag<["-"], "fxray-always-emit-typedevents">, Group<f_Group>,
+  Flags<[CC1Option]>,
+  HelpText<"Determine whether to always emit __xray_typedevent(...) calls even if the function it appears in is not always instrumented.">;
+def fnoxray_always_emit_typedevents : Flag<["-"], "fno-xray-always-emit-typedevents">, Group<f_Group>,
+  Flags<[CC1Option]>;
+
 def fxray_link_deps : Flag<["-"], "fxray-link-deps">, Group<f_Group>,
   Flags<[CC1Option]>,
   HelpText<"Tells clang to add the link dependencies for XRay.">;
 def fnoxray_link_deps : Flag<["-"], "fnoxray-link-deps">, Group<f_Group>,
   Flags<[CC1Option]>;
 
 def fxray_instrumentation_bundle :
   JoinedOrSeparate<["-"], "fxray-instrumentation-bundle=">,

include/clang/Driver/XRayArgs.h

class XRayArgs {
   std::vector<std::string> NeverInstrumentFiles;
   std::vector<std::string> AttrListFiles;
   std::vector<std::string> ExtraDeps;
   std::vector<std::string> Modes;
   XRayInstrSet InstrumentationBundle;
   bool XRayInstrument = false;
   int InstructionThreshold = 200;
   bool XRayAlwaysEmitCustomEvents = false;
+  bool XRayAlwaysEmitTypedEvents = false;
   bool XRayRT = true;
 
 public:
   /// Parses the XRay arguments from an argument list.
   XRayArgs(const ToolChain &TC, const llvm::opt::ArgList &Args);
   void addArgs(const ToolChain &TC, const llvm::opt::ArgList &Args,
                llvm::opt::ArgStringList &CmdArgs, types::ID InputType) const;
 

include/clang/Frontend/CodeGenOptions.def

CODEGENOPT(CFProtectionBranch , 1, 0) ///< if -fcf-protection is
                                       ///< set to full or branch.
 CODEGENOPT(XRayInstrumentFunctions , 1, 0) ///< Set when -fxray-instrument is
                                            ///< enabled.
 CODEGENOPT(StackSizeSection  , 1, 0) ///< Set when -fstack-size-section is enabled.
 
 ///< Set when -fxray-always-emit-customevents is enabled.
 CODEGENOPT(XRayAlwaysEmitCustomEvents , 1, 0)
 
+///< Set when -fxray-always-emit-typedevents is enabled.
+CODEGENOPT(XRayAlwaysEmitTypedEvents , 1, 0)
+
 ///< Set the minimum number of instructions in a function to determine selective
 ///< XRay instrumentation.
 VALUE_CODEGENOPT(XRayInstructionThreshold , 32, 200)
 
 CODEGENOPT(InstrumentForProfiling , 1, 0) ///< Set when -pg is enabled.
 CODEGENOPT(CallFEntry , 1, 0) ///< Set when -mfentry is enabled.
 CODEGENOPT(LessPreciseFPMAD  , 1, 0) ///< Enable less precise MAD instructions to
                                      ///< be generated.

lib/Basic/XRayInstr.cpp

 
 namespace clang {
 
 XRayInstrMask parseXRayInstrValue(StringRef Value) {
   XRayInstrMask ParsedKind = llvm::StringSwitch<XRayInstrMask>(Value)
                                  .Case("all", XRayInstrKind::All)
                                  .Case("custom", XRayInstrKind::Custom)
                                  .Case("function", XRayInstrKind::Function)
+                                 .Case("typed", XRayInstrKind::Typed)
                                  .Case("none", XRayInstrKind::None)
                                  .Default(XRayInstrKind::None);
   return ParsedKind;
 }
 
 } // namespace clang

lib/CodeGen/CGBuiltin.cpp

case Builtin::BI__xray_customevent: {
     }
     auto Arg1 = EmitScalarExpr(E->getArg(1));
     auto PTy1 = FTy->getParamType(1);
     if (PTy1 != Arg1->getType())
       Arg1 = Builder.CreateTruncOrBitCast(Arg1, PTy1);
     return RValue::get(Builder.CreateCall(F, {Arg0Val, Arg1}));
   }
 
+  case Builtin::BI__xray_typedevent: {
+    // TODO: There should be a way to always emit events even if the current
+    // function is not instrumented. Losing events in a stream can cripple
+    // a trace.
+    if (!ShouldXRayInstrumentFunction())
+      return RValue::getIgnored();
+
+    if (!CGM.getCodeGenOpts().XRayInstrumentationBundle.has(
+            XRayInstrKind::Typed))
+      return RValue::getIgnored();
+
+    if (const auto *XRayAttr = CurFuncDecl->getAttr<XRayInstrumentAttr>())
+      if (XRayAttr->neverXRayInstrument() && !AlwaysEmitXRayTypedEvents())
+        return RValue::getIgnored();
+
+    Function *F = CGM.getIntrinsic(Intrinsic::xray_typedevent);
+    auto FTy = F->getFunctionType();
+    auto Arg0 = EmitScalarExpr(E->getArg(0));
+    auto PTy0 = FTy->getParamType(0);
+    if (PTy0 != Arg0->getType())
+      Arg0 = Builder.CreateTruncOrBitCast(Arg0, PTy0);
+    auto Arg1 = E->getArg(1);
+    auto Arg1Val = EmitScalarExpr(Arg1);
+    auto Arg1Ty = Arg1->getType();
+    auto PTy1 = FTy->getParamType(1);
+    if (PTy1 != Arg1Val->getType()) {
+      if (Arg1Ty->isArrayType())
+        Arg1Val = EmitArrayToPointerDecay(Arg1).getPointer();
+      else
+        Arg1Val = Builder.CreatePointerCast(Arg1Val, PTy1);
+    }
+    auto Arg2 = EmitScalarExpr(E->getArg(2));
+    auto PTy2 = FTy->getParamType(2);
+    if (PTy2 != Arg2->getType())
+      Arg2 = Builder.CreateTruncOrBitCast(Arg2, PTy2);
+    return RValue::get(Builder.CreateCall(F, {Arg0, Arg1Val, Arg2}));
+  }
+
   case Builtin::BI__builtin_ms_va_start:
   case Builtin::BI__builtin_ms_va_end:
     return RValue::get(
         EmitVAStartEnd(EmitMSVAListRef(E->getArg(0)).getPointer(),
                        BuiltinID == Builtin::BI__builtin_ms_va_start));
 
   case Builtin::BI__builtin_ms_va_copy: {
     // Lower this manually. We can't reliably determine whether or not any

lib/CodeGen/CodeGenFunction.h

public:
   /// ShouldXRayInstrument - Return true if the current function should be
   /// instrumented with XRay nop sleds.
   bool ShouldXRayInstrumentFunction() const;
 
   /// AlwaysEmitXRayCustomEvents - Return true if we must unconditionally emit
   /// XRay custom event handling calls.
   bool AlwaysEmitXRayCustomEvents() const;
 
+  /// AlwaysEmitXRayTypedEvents - Return true if clang must unconditionally emit
+  /// XRay typed event handling calls.
+  bool AlwaysEmitXRayTypedEvents() const;
+
   /// Encode an address into a form suitable for use in a function prologue.
   llvm::Constant *EncodeAddrForUseInPrologue(llvm::Function *F,
                                              llvm::Constant *Addr);
 
   /// Decode an address used in a function prologue, encoded by \c
   /// EncodeAddrForUseInPrologue.
   llvm::Value *DecodeAddrUsedInPrologue(llvm::Value *F,
                                         llvm::Value *EncodedAddr);

lib/CodeGen/CodeGenFunction.cpp

 
 /// ShouldXRayInstrument - Return true if the current function should be
 /// instrumented with XRay nop sleds.
 bool CodeGenFunction::ShouldXRayInstrumentFunction() const {
   return CGM.getCodeGenOpts().XRayInstrumentFunctions;
 }
 
 /// AlwaysEmitXRayCustomEvents - Return true if we should emit IR for calls to
-/// the __xray_customevent(...) builin calls, when doing XRay instrumentation.
+/// the __xray_customevent(...) builtin calls, when doing XRay instrumentation.
 bool CodeGenFunction::AlwaysEmitXRayCustomEvents() const {
   return CGM.getCodeGenOpts().XRayInstrumentFunctions &&
          (CGM.getCodeGenOpts().XRayAlwaysEmitCustomEvents ||
           CGM.getCodeGenOpts().XRayInstrumentationBundle.Mask ==
               XRayInstrKind::Custom);
 }
 
+bool CodeGenFunction::AlwaysEmitXRayTypedEvents() const {
+  return CGM.getCodeGenOpts().XRayInstrumentFunctions &&
+         (CGM.getCodeGenOpts().XRayAlwaysEmitTypedEvents ||
+          CGM.getCodeGenOpts().XRayInstrumentationBundle.Mask ==
+              XRayInstrKind::Typed);
+}
+
 llvm::Constant *
 CodeGenFunction::EncodeAddrForUseInPrologue(llvm::Function *F,
                                             llvm::Constant *Addr) {
   // Addresses stored in prologue data can't require run-time fixups and must
   // be PC-relative. Run-time fixups are undesirable because they necessitate
   // writable text segments, which are unsafe. And absolute addresses are
   // undesirable because they break PIE mode.
 

lib/Driver/XRayArgs.cpp

if (Args.hasFlag(options::OPT_fxray_instrument,
     // By default, the back-end will not emit the lowering for XRay customevent
     // calls if the function is not instrumented. In the future we will change
     // this default to be the reverse, but in the meantime we're going to
     // introduce the new functionality behind a flag.
     if (Args.hasFlag(options::OPT_fxray_always_emit_customevents,
                      options::OPT_fnoxray_always_emit_customevents, false))
       XRayAlwaysEmitCustomEvents = true;
 
+    if (Args.hasFlag(options::OPT_fxray_always_emit_typedevents,
+                     options::OPT_fnoxray_always_emit_typedevents, false))
+      XRayAlwaysEmitTypedEvents = true;
+
     if (!Args.hasFlag(options::OPT_fxray_link_deps,
                       options::OPT_fnoxray_link_deps, true))
       XRayRT = false;
 
     auto Bundles =
         Args.getAllArgValues(options::OPT_fxray_instrumentation_bundle);
     if (Bundles.empty())
       InstrumentationBundle.Mask = XRayInstrKind::All;
void XRayArgs::addArgs(const ToolChain &TC, const ArgList &Args,
   if (!XRayInstrument)
     return;
 
   CmdArgs.push_back(XRayInstrumentOption);
 
   if (XRayAlwaysEmitCustomEvents)
     CmdArgs.push_back("-fxray-always-emit-customevents");
 
+  if (XRayAlwaysEmitTypedEvents)
+    CmdArgs.push_back("-fxray-always-emit-typedevents");
+
   CmdArgs.push_back(Args.MakeArgString(Twine(XRayInstructionThresholdOption) +
                                        Twine(InstructionThreshold)));
 
   for (const auto &Always : AlwaysInstrumentFiles) {
     SmallString<64> AlwaysInstrumentOpt("-fxray-always-instrument=");
     AlwaysInstrumentOpt += Always;
     CmdArgs.push_back(Args.MakeArgString(AlwaysInstrumentOpt));
   }

lib/Frontend/CompilerInvocation.cpp

Opts.InstrumentFunctionsAfterInlining =
       Args.hasArg(OPT_finstrument_functions_after_inlining);
   Opts.InstrumentFunctionEntryBare =
       Args.hasArg(OPT_finstrument_function_entry_bare);
 
   Opts.XRayInstrumentFunctions =
       Args.hasArg(OPT_fxray_instrument);
   Opts.XRayAlwaysEmitCustomEvents =
       Args.hasArg(OPT_fxray_always_emit_customevents);
+  Opts.XRayAlwaysEmitTypedEvents =
+      Args.hasArg(OPT_fxray_always_emit_typedevents);
   Opts.XRayInstructionThreshold =
       getLastArgIntValue(Args, OPT_fxray_instruction_threshold_EQ, 200, Diags);
 
   auto XRayInstrBundles =
       Args.getAllArgValues(OPT_fxray_instrumentation_bundle);
   if (XRayInstrBundles.empty())
     Opts.XRayInstrumentationBundle.Mask = XRayInstrKind::All;
   else
#include "clang/Frontend/LangStandards.def"
   Opts.XRayInstrument =
       Args.hasFlag(OPT_fxray_instrument, OPT_fnoxray_instrument, false);
 
   // -fxray-always-emit-customevents
   Opts.XRayAlwaysEmitCustomEvents =
       Args.hasFlag(OPT_fxray_always_emit_customevents,
                    OPT_fnoxray_always_emit_customevents, false);
 
+  // -fxray-always-emit-typedevents
+  Opts.XRayAlwaysEmitTypedEvents =
+      Args.hasFlag(OPT_fxray_always_emit_typedevents,
+                   OPT_fnoxray_always_emit_customevents, false);
+
   // -fxray-{always,never}-instrument= filenames.
   Opts.XRayAlwaysInstrumentFiles =
       Args.getAllArgValues(OPT_fxray_always_instrument);
   Opts.XRayNeverInstrumentFiles =
       Args.getAllArgValues(OPT_fxray_never_instrument);
   Opts.XRayAttrListFiles = Args.getAllArgValues(OPT_fxray_attr_list);
 
   // -fallow-editor-placeholders

test/CodeGen/xray-always-emit-typedevent.cpp

+// RUN: %clang_cc1 -fxray-instrument -fxray-always-emit-typedevents -x c++ \
+// RUN:     -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s \
+// RUN:     | FileCheck %s
+
+// CHECK-LABEL: @_Z15neverInstrumentv
+[[clang::xray_never_instrument]] void neverInstrument() {
+  static constexpr char kPhase[] = "never";
+  __xray_typedevent(1, kPhase, 5);
+  // CHECK: call void @llvm.xray.typedevent(i16 {{.*}}, i8*{{.*}}, i32 5)
+}

test/CodeGen/xray-instrumentation-bundles.cpp

 // RUN: %clang_cc1 -fxray-instrument -fxray-instrumentation-bundle=none -x c++ \
 // RUN:     -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s \
-// RUN:     | FileCheck --check-prefixes CHECK,NOFUNCTION,NOCUSTOM %s
-// RUN: %clang_cc1 -fxray-instrument \
-// RUN:     -fxray-instrumentation-bundle=function -x c++ \
+// RUN:     | FileCheck --check-prefixes CHECK,NOFUNCTION,NOCUSTOM,NOTYPED %s
+// RUN: %clang_cc1 -fxray-instrument -fxray-instrumentation-bundle=function -x c++ \
 // RUN:     -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s \
-// RUN:     | FileCheck --check-prefixes CHECK,FUNCTION,NOCUSTOM %s
+// RUN:     | FileCheck --check-prefixes CHECK,FUNCTION,NOCUSTOM,NOTYPED %s
 // RUN: %clang_cc1 -fxray-instrument \
 // RUN:     -fxray-instrumentation-bundle=custom -x c++ \
 // RUN:     -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s \
-// RUN:     | FileCheck --check-prefixes CHECK,NOFUNCTION,CUSTOM %s
+// RUN:     | FileCheck --check-prefixes CHECK,NOFUNCTION,CUSTOM,NOTYPED %s
+// RUN: %clang_cc1 -fxray-instrument \
+// RUN:     -fxray-instrumentation-bundle=typed -x c++ \
+// RUN:     -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s \
+// RUN:     | FileCheck --check-prefixes CHECK,NOFUNCTION,NOCUSTOM,TYPED %s
+// RUN: %clang_cc1 -fxray-instrument \
+// RUN:     -fxray-instrumentation-bundle=custom,typed -x c++ \
+// RUN:     -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s \
+// RUN:     | FileCheck --check-prefixes CHECK,NOFUNCTION,CUSTOM,TYPED %s
 // RUN: %clang_cc1 -fxray-instrument \
 // RUN:     -fxray-instrumentation-bundle=function,custom -x c++ \
 // RUN:     -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s \
-// RUN:     | FileCheck --check-prefixes CHECK,FUNCTION,CUSTOM %s
+// RUN:     | FileCheck --check-prefixes CHECK,FUNCTION,CUSTOM,NOTYPED %s
+// RUN: %clang_cc1 -fxray-instrument \
+// RUN:     -fxray-instrumentation-bundle=function,typed -x c++ \
+// RUN:     -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s \
+// RUN:     | FileCheck --check-prefixes CHECK,FUNCTION,NOCUSTOM,TYPED %s
+// RUN: %clang_cc1 -fxray-instrument \
+// RUN:     -fxray-instrumentation-bundle=function,custom,typed -x c++ \
+// RUN:     -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s \
+// RUN:     | FileCheck --check-prefixes CHECK,FUNCTION,CUSTOM,TYPED %s
 // RUN: %clang_cc1 -fxray-instrument \
 // RUN:     -fxray-instrumentation-bundle=function \
-// RUN:     -fxray-instrumentation-bundle=custom -x c++ \
+// RUN:     -fxray-instrumentation-bundle=custom \
+// RUN:     -fxray-instrumentation-bundle=typed -x c++ \
 // RUN:     -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s \
-// RUN:     | FileCheck --check-prefixes CHECK,FUNCTION,CUSTOM %s
+// RUN:     | FileCheck --check-prefixes CHECK,FUNCTION,CUSTOM,TYPED %s
 
 // CHECK: define void @_Z16alwaysInstrumentv() #[[ALWAYSATTR:[0-9]+]] {
 [[clang::xray_always_instrument]] void alwaysInstrument() {
   static constexpr char kPhase[] = "always";
   __xray_customevent(kPhase, 6);
+  __xray_typedevent(1, kPhase, 6);
   // CUSTOM: call void @llvm.xray.customevent(i8*{{.*}}, i32 6)
   // NOCUSTOM-NOT: call void @llvm.xray.customevent(i8*{{.*}}, i32 6)
+  // TYPED: call void @llvm.xray.typedevent(i16 {{.*}}, i8*{{.*}}, i32 6)
+  // NOTYPED-NOT: call void @llvm.xray.typedevent(i16 {{.*}}, i8*{{.*}}, i32 6)
 }
 
 // FUNCTION: attributes #[[ALWAYSATTR]] = {{.*}} "function-instrument"="xray-always" {{.*}}
 // NOFUNCTION-NOT: attributes #[[ALWAYSATTR]] = {{.*}} "function-instrument"="xray-always" {{.*}}

test/CodeGen/xray-typedevent.cpp

+// RUN: %clang_cc1 -fxray-instrument -x c++ -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s
+
+// CHECK-LABEL: @_Z16alwaysInstrumentv
+[[clang::xray_always_instrument]] void alwaysInstrument() {
+  // Event types would normally come from calling __xray_register_event_type
+  // from compiler-rt
+  auto EventType = 1;
+  static constexpr char kPhase[] = "instrument";
+  __xray_typedevent(EventType, kPhase, 10);
+  // CHECK: call void @llvm.xray.typedevent(i16 {{.*}}, i8*{{.*}}, i32 10)
+}
+
+// CHECK-LABEL: @_Z15neverInstrumentv
+[[clang::xray_never_instrument]] void neverInstrument() {
+  auto EventType = 2;
+  static constexpr char kPhase[] = "never";
+  __xray_typedevent(EventType, kPhase, 5);
+  // CHECK-NOT: call void @llvm.xray.typedevent(i16 {{.*}}, i8*{{.*}}, i32 5)
+}
+
+// CHECK-LABEL: @_Z21conditionalInstrumenti
+[[clang::xray_always_instrument]] void conditionalInstrument(int v) {
+  auto TrueEventType = 3;
+  auto UntrueEventType = 4;
+  static constexpr char kTrue[] = "true";
+  static constexpr char kUntrue[] = "untrue";
+  if (v % 2)
+    __xray_typedevent(TrueEventType, kTrue, 4);
+  else
+    __xray_typedevent(UntrueEventType, kUntrue, 6);
+
+  // CHECK: call void @llvm.xray.typedevent(i16 {{.*}}, i8*{{.*}}, i32 4)
+  // CHECK: call void @llvm.xray.typedevent(i16 {{.*}}, i8*{{.*}}, i32 6)
+}