Author: StoeckOverflow
Date: 2026-07-13T14:36:11+01:00
New Revision: ee71eb831b6090897df8ae4f843f4b14370131d5

URL: 
https://github.com/llvm/llvm-project/commit/ee71eb831b6090897df8ae4f843f4b14370131d5
DIFF: 
https://github.com/llvm/llvm-project/commit/ee71eb831b6090897df8ae4f843f4b14370131d5.diff

LOG: [APINotes] Match function-like Where.Parameters in Sema (#205307)

This PR teaches Sema to apply function-like `Where.Parameters` selectors
for API notes.

It builds on #204147 by using the serialized `Where.Parameters` selector
keys in Sema. For each `FunctionDecl` / `CXXMethodDecl`, Sema derives an
exact parameter selector from the declaration’s `FunctionProtoType`.
Broad name-only API notes lookup still runs first, preserving existing
behavior. If Clang can form a parameter selector, Sema then performs an
exact selector lookup and applies that result second, allowing
overload-specific notes to refine same-name broad notes.

Tests:
- Adds end-to-end module APINotes Sema coverage (`.apinotes` source ->
binary APINotes -> reader lookup -> Sema matching -> AST result)
- Covers core matching behavior for global functions and C++ methods,
including same-name overloads, exact empty selectors, broad-plus-exact
coexistence and mismatched selectors
- Covers important edge cases: default arguments, static methods, alias
spellings remaining non-canonicalized, by-value `const`, namespaced
functions, and overloaded operators.

This PR does not add duplicate-selector or unmatched-selector
diagnostics. Those remain for a follow-up diagnostics PR.

**Note**: this PR was originally stacked on top of #204147. It has now
been rebased on top of main containing those changes, so the remaining
diff should reflect only the top commit specific to this PR.

Reviewers: @Xazax-hun @j-hui @egorzhdan

---------

Co-authored-by: John Hui <[email protected]>

Added: 
    clang/test/APINotes/Inputs/Headers/WhereParametersSema.apinotes
    clang/test/APINotes/Inputs/Headers/WhereParametersSema.h
    clang/test/APINotes/where-parameters-sema.cpp

Modified: 
    clang/include/clang/APINotes/APINotesReader.h
    clang/lib/APINotes/APINotesFormat.h
    clang/lib/APINotes/APINotesReader.cpp
    clang/lib/Sema/SemaAPINotes.cpp
    clang/test/APINotes/Inputs/Headers/module.modulemap

Removed: 
    


################################################################################
diff  --git a/clang/include/clang/APINotes/APINotesReader.h 
b/clang/include/clang/APINotes/APINotesReader.h
index 8e748b5803189..761745e20b61a 100644
--- a/clang/include/clang/APINotes/APINotesReader.h
+++ b/clang/include/clang/APINotes/APINotesReader.h
@@ -22,6 +22,7 @@
 #include "llvm/Support/VersionTuple.h"
 #include <memory>
 #include <optional>
+#include <string>
 
 namespace clang {
 namespace api_notes {
@@ -166,7 +167,7 @@ class APINotesReader {
   /// key, and a non-empty list uses an exact ordered parameter key.
   VersionedInfo<CXXMethodInfo>
   lookupCXXMethod(ContextID CtxID, llvm::StringRef Name,
-                  llvm::ArrayRef<llvm::StringRef> Parameters);
+                  llvm::ArrayRef<std::string> Parameters);
 
   /// Look for information regarding the given global variable.
   ///
@@ -191,7 +192,7 @@ class APINotesReader {
   /// key, and a non-empty list uses an exact ordered parameter key.
   VersionedInfo<GlobalFunctionInfo>
   lookupGlobalFunction(llvm::StringRef Name,
-                       llvm::ArrayRef<llvm::StringRef> Parameters,
+                       llvm::ArrayRef<std::string> Parameters,
                        std::optional<Context> Ctx = std::nullopt);
 
   /// Look for information regarding the given enumerator.
@@ -242,15 +243,17 @@ class APINotesReader {
 private:
   VersionedInfo<CXXMethodInfo> lookupCXXMethodImpl(ContextID CtxID,
                                                    llvm::StringRef Name);
+  template <typename ParameterT>
   VersionedInfo<CXXMethodInfo>
   lookupCXXMethodImpl(ContextID CtxID, llvm::StringRef Name,
-                      llvm::ArrayRef<llvm::StringRef> Parameters);
+                      llvm::ArrayRef<ParameterT> Parameters);
 
   VersionedInfo<GlobalFunctionInfo>
   lookupGlobalFunctionImpl(llvm::StringRef Name, std::optional<Context> Ctx);
+  template <typename ParameterT>
   VersionedInfo<GlobalFunctionInfo>
   lookupGlobalFunctionImpl(llvm::StringRef Name,
-                           llvm::ArrayRef<llvm::StringRef> Parameters,
+                           llvm::ArrayRef<ParameterT> Parameters,
                            std::optional<Context> Ctx);
 };
 

diff  --git a/clang/lib/APINotes/APINotesFormat.h 
b/clang/lib/APINotes/APINotesFormat.h
index df67da0845baf..f34ca2e2e363f 100644
--- a/clang/lib/APINotes/APINotesFormat.h
+++ b/clang/lib/APINotes/APINotesFormat.h
@@ -417,10 +417,10 @@ getFunctionKeyImpl(uint32_t ParentContextID, 
llvm::StringRef Name,
   return FunctionTableKey(ParentContextID, *NameID);
 }
 
-template <typename GetIdentifierFn>
+template <typename ParameterT, typename GetIdentifierFn>
 std::optional<FunctionTableKey>
 getFunctionKeyImpl(uint32_t ParentContextID, llvm::StringRef Name,
-                   llvm::ArrayRef<llvm::StringRef> Parameters,
+                   llvm::ArrayRef<ParameterT> Parameters,
                    GetIdentifierFn GetIdentifier) {
   std::optional<IdentifierID> NameID = GetIdentifier(Name);
   if (!NameID)
@@ -428,8 +428,9 @@ getFunctionKeyImpl(uint32_t ParentContextID, 
llvm::StringRef Name,
 
   llvm::SmallVector<IdentifierID, 2> ParameterTypeIDs;
   ParameterTypeIDs.reserve(Parameters.size());
-  for (llvm::StringRef Parameter : Parameters) {
-    std::optional<IdentifierID> ParameterID = GetIdentifier(Parameter);
+  for (const ParameterT &Parameter : Parameters) {
+    std::optional<IdentifierID> ParameterID =
+        GetIdentifier(llvm::StringRef(Parameter));
     if (!ParameterID)
       return std::nullopt;
     ParameterTypeIDs.push_back(*ParameterID);

diff  --git a/clang/lib/APINotes/APINotesReader.cpp 
b/clang/lib/APINotes/APINotesReader.cpp
index 9305a5f10b4e8..888844fbb6cd9 100644
--- a/clang/lib/APINotes/APINotesReader.cpp
+++ b/clang/lib/APINotes/APINotesReader.cpp
@@ -857,14 +857,16 @@ class APINotesReader::Implementation {
                                       llvm::SmallVectorImpl<uint64_t> 
&Scratch);
   std::optional<FunctionTableKey> getFunctionKey(uint32_t ParentContextID,
                                                  llvm::StringRef Name);
+  template <typename ParameterT>
   std::optional<FunctionTableKey>
   getFunctionKey(uint32_t ParentContextID, llvm::StringRef Name,
-                 llvm::ArrayRef<llvm::StringRef> Parameters);
+                 llvm::ArrayRef<ParameterT> Parameters);
   std::optional<FunctionTableKey>
   getFunctionKey(std::optional<Context> ParentContext, llvm::StringRef Name);
+  template <typename ParameterT>
   std::optional<FunctionTableKey>
   getFunctionKey(std::optional<Context> ParentContext, llvm::StringRef Name,
-                 llvm::ArrayRef<llvm::StringRef> Parameters);
+                 llvm::ArrayRef<ParameterT> Parameters);
 
   llvm::Error readGlobalFunctionBlock(llvm::BitstreamCursor &Cursor,
                                       llvm::SmallVectorImpl<uint64_t> 
&Scratch);
@@ -899,9 +901,10 @@ APINotesReader::Implementation::getFunctionKey(uint32_t 
ParentContextID,
   });
 }
 
+template <typename ParameterT>
 std::optional<FunctionTableKey> APINotesReader::Implementation::getFunctionKey(
     uint32_t ParentContextID, llvm::StringRef Name,
-    llvm::ArrayRef<llvm::StringRef> Parameters) {
+    llvm::ArrayRef<ParameterT> Parameters) {
   return getFunctionKeyImpl(
       ParentContextID, Name, Parameters,
       [this](llvm::StringRef S) { return getIdentifier(S); });
@@ -914,9 +917,10 @@ std::optional<FunctionTableKey> 
APINotesReader::Implementation::getFunctionKey(
   return getFunctionKey(ParentContextID, Name);
 }
 
+template <typename ParameterT>
 std::optional<FunctionTableKey> APINotesReader::Implementation::getFunctionKey(
     std::optional<Context> ParentContext, llvm::StringRef Name,
-    llvm::ArrayRef<llvm::StringRef> Parameters) {
+    llvm::ArrayRef<ParameterT> Parameters) {
   uint32_t ParentContextID =
       ParentContext ? ParentContext->id.Value : static_cast<uint32_t>(-1);
   return getFunctionKey(ParentContextID, Name, Parameters);
@@ -2342,7 +2346,7 @@ auto APINotesReader::lookupCXXMethod(ContextID CtxID, 
llvm::StringRef Name)
 }
 
 auto APINotesReader::lookupCXXMethod(ContextID CtxID, llvm::StringRef Name,
-                                     llvm::ArrayRef<llvm::StringRef> 
Parameters)
+                                     llvm::ArrayRef<std::string> Parameters)
     -> VersionedInfo<CXXMethodInfo> {
   return lookupCXXMethodImpl(CtxID, Name, Parameters);
 }
@@ -2364,9 +2368,9 @@ auto APINotesReader::lookupCXXMethodImpl(ContextID CtxID, 
llvm::StringRef Name)
   return {Implementation->SwiftVersion, *Known};
 }
 
-auto APINotesReader::lookupCXXMethodImpl(
-    ContextID CtxID, llvm::StringRef Name,
-    llvm::ArrayRef<llvm::StringRef> Parameters)
+template <typename ParameterT>
+auto APINotesReader::lookupCXXMethodImpl(ContextID CtxID, llvm::StringRef Name,
+                                         llvm::ArrayRef<ParameterT> Parameters)
     -> VersionedInfo<CXXMethodInfo> {
   if (!Implementation->CXXMethodTable)
     return std::nullopt;
@@ -2409,7 +2413,7 @@ auto APINotesReader::lookupGlobalFunction(llvm::StringRef 
Name,
 }
 
 auto APINotesReader::lookupGlobalFunction(
-    llvm::StringRef Name, llvm::ArrayRef<llvm::StringRef> Parameters,
+    llvm::StringRef Name, llvm::ArrayRef<std::string> Parameters,
     std::optional<Context> Ctx) -> VersionedInfo<GlobalFunctionInfo> {
   return lookupGlobalFunctionImpl(Name, Parameters, Ctx);
 }
@@ -2432,8 +2436,9 @@ auto 
APINotesReader::lookupGlobalFunctionImpl(llvm::StringRef Name,
   return {Implementation->SwiftVersion, *Known};
 }
 
+template <typename ParameterT>
 auto APINotesReader::lookupGlobalFunctionImpl(
-    llvm::StringRef Name, llvm::ArrayRef<llvm::StringRef> Parameters,
+    llvm::StringRef Name, llvm::ArrayRef<ParameterT> Parameters,
     std::optional<Context> Ctx) -> VersionedInfo<GlobalFunctionInfo> {
   if (!Implementation->GlobalFunctionTable)
     return std::nullopt;

diff  --git a/clang/lib/Sema/SemaAPINotes.cpp b/clang/lib/Sema/SemaAPINotes.cpp
index 67c08d239e758..1ab1eac4a5434 100644
--- a/clang/lib/Sema/SemaAPINotes.cpp
+++ b/clang/lib/Sema/SemaAPINotes.cpp
@@ -993,6 +993,111 @@ UnwindTagContext(TagDecl *DC, api_notes::APINotesManager 
&APINotes) {
   return std::nullopt;
 }
 
+static void stripAPINotesParameterNullability(QualType &ParamType) {
+  while (true) {
+    if (!AttributedType::stripOuterNullability(ParamType))
+      return;
+  }
+}
+
+struct APINotesParameterSelector {
+  SmallVector<std::string, 4> Parameters;
+
+  bool operator==(const APINotesParameterSelector &Other) const {
+    return Parameters == Other.Parameters;
+  }
+
+  bool operator!=(const APINotesParameterSelector &Other) const {
+    return !(*this == Other);
+  }
+};
+
+struct APINotesParameterSelectorCandidates {
+  APINotesParameterSelector Source;
+  std::optional<APINotesParameterSelector> Desugared;
+};
+
+static PrintingPolicy
+getAPINotesParameterSelectorPrintingPolicy(const ASTContext &Context) {
+  PrintingPolicy Policy(Context.getLangOpts());
+  Policy.PrintAsCanonical = false;
+  Policy.FullyQualifiedName = false;
+  Policy.SuppressScope = false;
+  Policy.UsePreferredNames = false;
+  Policy.MSVCFormatting = false;
+  Policy.SplitTemplateClosers = false;
+  Policy.IncludeNewlines = false;
+  return Policy;
+}
+
+// Print the APINotes selector spelling for one parameter. The source-spelled
+// selector is tried first. The desugared spelling is only a permissive
+// fallback.
+static std::string getAPINotesParameterSelectorSpelling(
+    QualType ParamType, const ASTContext &Context, const PrintingPolicy 
&Policy,
+    bool Desugar) {
+  if (Desugar)
+    ParamType = ParamType.getDesugaredType(Context);
+
+  ParamType.removeLocalConst();
+  stripAPINotesParameterNullability(ParamType);
+
+  return ParamType.getAsString(Policy);
+}
+
+static std::optional<APINotesParameterSelectorCandidates>
+getAPINotesParameterSelectorCandidates(const Sema &S, const FunctionDecl *FD) {
+  const auto *FPT = FD->getType()->getAs<FunctionProtoType>();
+  if (!FPT)
+    return std::nullopt;
+
+  APINotesParameterSelectorCandidates Candidates;
+  APINotesParameterSelector Desugared;
+  Candidates.Source.Parameters.reserve(FPT->getNumParams());
+  Desugared.Parameters.reserve(FPT->getNumParams());
+
+  const PrintingPolicy Policy =
+      getAPINotesParameterSelectorPrintingPolicy(S.Context);
+  for (QualType ParamType : FPT->param_types()) {
+    Candidates.Source.Parameters.push_back(
+        getAPINotesParameterSelectorSpelling(ParamType, S.Context, Policy,
+                                             /*Desugar=*/false));
+    Desugared.Parameters.push_back(getAPINotesParameterSelectorSpelling(
+        ParamType, S.Context, Policy, /*Desugar=*/true));
+  }
+
+  if (Candidates.Source != Desugared)
+    Candidates.Desugared = std::move(Desugared);
+
+  return Candidates;
+}
+
+// Apply the first exact selector entry found. This preserves source-spelling
+// precedence over the desugared fallback and avoids applying multiple exact
+// entries for the same declaration.
+template <typename SpecificInfo, typename SpecificDecl>
+static void processExactAPINotes(
+    Sema &S, SpecificDecl *D,
+    const APINotesParameterSelectorCandidates &ParameterSelectorCandidates,
+    llvm::function_ref<api_notes::APINotesReader::VersionedInfo<SpecificInfo>(
+        ArrayRef<std::string>)>
+        LookupExact) {
+  auto ProcessSelector = [&](const APINotesParameterSelector &Selector) {
+    auto Info = LookupExact(Selector.Parameters);
+    if (Info.size() == 0)
+      return false;
+
+    ProcessVersionedAPINotes(S, D, Info);
+    return true;
+  };
+
+  if (ProcessSelector(ParameterSelectorCandidates.Source))
+    return;
+
+  if (ParameterSelectorCandidates.Desugared)
+    ProcessSelector(*ParameterSelectorCandidates.Desugared);
+}
+
 /// Process API notes that are associated with this declaration, mapping them
 /// to attributes as appropriate.
 void Sema::ProcessAPINotes(Decl *D) {
@@ -1024,10 +1129,20 @@ void Sema::ProcessAPINotes(Decl *D) {
     // Global functions.
     if (auto FD = dyn_cast<FunctionDecl>(D)) {
       if (FD->getDeclName().isIdentifier()) {
+        auto ParameterSelectorCandidates =
+            getAPINotesParameterSelectorCandidates(*this, FD);
         for (auto Reader : Readers) {
           auto Info =
               Reader->lookupGlobalFunction(FD->getName(), APINotesContext);
           ProcessVersionedAPINotes(*this, FD, Info);
+
+          if (ParameterSelectorCandidates)
+            processExactAPINotes<api_notes::GlobalFunctionInfo>(
+                *this, FD, *ParameterSelectorCandidates,
+                [&](ArrayRef<std::string> Parameters) {
+                  return Reader->lookupGlobalFunction(FD->getName(), 
Parameters,
+                                                      APINotesContext);
+                });
         }
       }
 
@@ -1211,6 +1326,8 @@ void Sema::ProcessAPINotes(Decl *D) {
       if (!isa<CXXConstructorDecl>(CXXMethod) &&
           !isa<CXXDestructorDecl>(CXXMethod) &&
           !isa<CXXConversionDecl>(CXXMethod)) {
+        auto ParameterSelectorCandidates =
+            getAPINotesParameterSelectorCandidates(*this, CXXMethod);
         for (auto Reader : Readers) {
           if (auto Context = UnwindTagContext(TagContext, APINotes)) {
             std::string MethodName;
@@ -1223,6 +1340,14 @@ void Sema::ProcessAPINotes(Decl *D) {
 
             auto Info = Reader->lookupCXXMethod(Context->id, MethodName);
             ProcessVersionedAPINotes(*this, CXXMethod, Info);
+
+            if (ParameterSelectorCandidates)
+              processExactAPINotes<api_notes::CXXMethodInfo>(
+                  *this, CXXMethod, *ParameterSelectorCandidates,
+                  [&](ArrayRef<std::string> Parameters) {
+                    return Reader->lookupCXXMethod(Context->id, MethodName,
+                                                   Parameters);
+                  });
           }
         }
       }

diff  --git a/clang/test/APINotes/Inputs/Headers/WhereParametersSema.apinotes 
b/clang/test/APINotes/Inputs/Headers/WhereParametersSema.apinotes
new file mode 100644
index 0000000000000..7ffee9223f8c3
--- /dev/null
+++ b/clang/test/APINotes/Inputs/Headers/WhereParametersSema.apinotes
@@ -0,0 +1,166 @@
+---
+Name: WhereParametersSema
+Functions:
+- Name: makeWidget
+  Where:
+    Parameters:
+    - int
+  SwiftName: makeIntWidget(_:)
+- Name: makeWidget
+  Where:
+    Parameters:
+    - double
+  SwiftName: makeDoubleWidget(_:)
+- Name: makeWidget
+  Where:
+    Parameters: []
+  SwiftName: makeCurrentWidget()
+- Name: broadGlobal
+  SwiftPrivate: true
+- Name: coexistGlobal
+  SwiftPrivate: true
+- Name: coexistGlobal
+  Where:
+    Parameters:
+    - int
+  SwiftName: coexistGlobalInt(_:)
+- Name: mismatchGlobal
+  Where:
+    Parameters:
+    - int
+  SwiftName: shouldNotApplyGlobal(_:)
+- Name: aliasGlobal
+  Where:
+    Parameters:
+    - int
+  SwiftName: aliasGlobal(_:)
+- Name: aliasPrecedenceGlobal
+  Where:
+    Parameters:
+    - int
+  SwiftName: fallbackAliasPrecedenceGlobal(_:)
+- Name: aliasPrecedenceGlobal
+  Where:
+    Parameters:
+    - AliasInt
+  SwiftName: aliasPrecedenceGlobal(_:)
+- Name: multiAliasGlobal
+  Where:
+    Parameters:
+    - int
+  SwiftName: multiAliasGlobal(_:)
+- Name: nullableGlobal
+  Where:
+    Parameters:
+    - 'char *'
+  SwiftName: nullableGlobal(_:)
+- Name: rawIntGlobal
+  Where:
+    Parameters:
+    - int
+  SwiftName: rawIntGlobal(_:)
+- Name: constValueGlobal
+  Where:
+    Parameters:
+    - int
+  SwiftName: constValueGlobal(_:)
+Namespaces:
+- Name: SelectorNamespace
+  Functions:
+  - Name: makeNamespaced
+    Where:
+      Parameters:
+      - int
+    SwiftName: makeNamespacedInt(_:)
+  - Name: makeNamespaced
+    Where:
+      Parameters:
+      - double
+    SwiftName: makeNamespacedDouble(_:)
+Tags:
+- Name: SelectorWidget
+  Methods:
+  - Name: setValue
+    Where:
+      Parameters:
+      - int
+    SwiftName: setIntValue(_:)
+  - Name: setValue
+    Where:
+      Parameters:
+      - double
+    SwiftName: setDoubleValue(_:)
+  - Name: setValue
+    Where:
+      Parameters: []
+    SwiftName: currentValue()
+  - Name: broad
+    SwiftPrivate: true
+  - Name: coexist
+    SwiftPrivate: true
+  - Name: coexist
+    Where:
+      Parameters:
+      - int
+    SwiftName: coexistInt(_:)
+  - Name: defaults
+    Where:
+      Parameters:
+      - int
+      - double
+    SwiftName: defaultsWithTwoParameters(_:_:)
+  - Name: configure
+    Where:
+      Parameters:
+      - int
+    SwiftName: configureInt(_:)
+  - Name: mismatch
+    Where:
+      Parameters:
+      - int
+    SwiftName: shouldNotApplyMethod(_:)
+  - Name: alias
+    Where:
+      Parameters:
+      - int
+    SwiftName: alias(_:)
+  - Name: aliasPrecedence
+    Where:
+      Parameters:
+      - int
+    SwiftName: fallbackAliasPrecedence(_:)
+  - Name: aliasPrecedence
+    Where:
+      Parameters:
+      - AliasInt
+    SwiftName: aliasPrecedence(_:)
+  - Name: multiAlias
+    Where:
+      Parameters:
+      - int
+    SwiftName: multiAlias(_:)
+  - Name: nullable
+    Where:
+      Parameters:
+      - 'char *'
+    SwiftName: nullable(_:)
+  - Name: rawInt
+    Where:
+      Parameters:
+      - int
+    SwiftName: rawInt(_:)
+  - Name: constValue
+    Where:
+      Parameters:
+      - int
+    SwiftName: constValue(_:)
+  - Name: operator+
+    Where:
+      Parameters:
+      - int
+    SwiftName: plusInt(_:)
+  - Name: operator+
+    Where:
+      Parameters:
+      - double
+    SwiftName: plusDouble(_:)

diff  --git a/clang/test/APINotes/Inputs/Headers/WhereParametersSema.h 
b/clang/test/APINotes/Inputs/Headers/WhereParametersSema.h
new file mode 100644
index 0000000000000..8226fa287b115
--- /dev/null
+++ b/clang/test/APINotes/Inputs/Headers/WhereParametersSema.h
@@ -0,0 +1,59 @@
+#ifndef WHERE_PARAMETERS_SEMA_H
+#define WHERE_PARAMETERS_SEMA_H
+
+using AliasInt = int;
+using AliasAliasInt = AliasInt;
+using DeepAliasInt = AliasAliasInt;
+
+void makeWidget(int);
+void makeWidget(double);
+void makeWidget();
+
+void broadGlobal(int);
+void broadGlobal(double);
+
+void coexistGlobal(int);
+void coexistGlobal(double);
+
+void mismatchGlobal(float);
+void aliasGlobal(AliasInt);
+void aliasPrecedenceGlobal(AliasInt);
+void multiAliasGlobal(DeepAliasInt);
+void nullableGlobal(char * _Nonnull);
+void rawIntGlobal(int);
+void constValueGlobal(const int);
+
+namespace SelectorNamespace {
+void makeNamespaced(int);
+void makeNamespaced(double);
+}
+
+struct SelectorWidget {
+  void setValue(int);
+  void setValue(double);
+  void setValue();
+
+  void broad(int);
+  void broad(double);
+
+  void coexist(int);
+  void coexist(double);
+
+  void defaults(int, double = 0);
+  void defaults(int);
+
+  static void configure(int);
+
+  void mismatch(float);
+  void alias(AliasInt);
+  void aliasPrecedence(AliasInt);
+  void multiAlias(DeepAliasInt);
+  void nullable(char * _Nonnull);
+  void rawInt(int);
+  void constValue(const int);
+
+  SelectorWidget operator+(int);
+  SelectorWidget operator+(double);
+};
+
+#endif // WHERE_PARAMETERS_SEMA_H

diff  --git a/clang/test/APINotes/Inputs/Headers/module.modulemap 
b/clang/test/APINotes/Inputs/Headers/module.modulemap
index 7bcf33644a14f..592d482ea7a57 100644
--- a/clang/test/APINotes/Inputs/Headers/module.modulemap
+++ b/clang/test/APINotes/Inputs/Headers/module.modulemap
@@ -70,3 +70,8 @@ module UnsafeBufferUsage {
   header "UnsafeBufferUsage.h"
   export *
 }
+
+module WhereParametersSema {
+  header "WhereParametersSema.h"
+  export *
+}

diff  --git a/clang/test/APINotes/where-parameters-sema.cpp 
b/clang/test/APINotes/where-parameters-sema.cpp
new file mode 100644
index 0000000000000..fbb7cb45b9441
--- /dev/null
+++ b/clang/test/APINotes/where-parameters-sema.cpp
@@ -0,0 +1,136 @@
+// RUN: rm -rf %t && mkdir -p %t
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -fsyntax-only -I %S/Inputs/Headers %s -x c++
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
makeWidget -x c++ | FileCheck --check-prefix=CHECK-GLOBAL-OVERLOADS %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
broadGlobal -x c++ | FileCheck --check-prefix=CHECK-GLOBAL-BROAD %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
coexistGlobal -x c++ | FileCheck --check-prefix=CHECK-GLOBAL-COEXIST %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
mismatchGlobal -x c++ | FileCheck --check-prefix=CHECK-GLOBAL-MISMATCH %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
aliasGlobal -x c++ | FileCheck --check-prefix=CHECK-GLOBAL-ALIAS %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
aliasPrecedenceGlobal -x c++ | FileCheck 
--check-prefix=CHECK-GLOBAL-ALIAS-PRECEDENCE %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
multiAliasGlobal -x c++ | FileCheck --check-prefix=CHECK-GLOBAL-MULTI-ALIAS %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
nullableGlobal -x c++ | FileCheck --check-prefix=CHECK-GLOBAL-NULLABILITY %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
rawIntGlobal -x c++ | FileCheck --check-prefix=CHECK-GLOBAL-RAW-INT %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
constValueGlobal -x c++ | FileCheck --check-prefix=CHECK-GLOBAL-CONST %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
SelectorNamespace::makeNamespaced -x c++ | FileCheck 
--check-prefix=CHECK-GLOBAL-NAMESPACE %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
SelectorWidget::setValue -x c++ | FileCheck 
--check-prefix=CHECK-METHOD-OVERLOADS %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
SelectorWidget::broad -x c++ | FileCheck --check-prefix=CHECK-METHOD-BROAD %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
SelectorWidget::coexist -x c++ | FileCheck --check-prefix=CHECK-METHOD-COEXIST 
%s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
SelectorWidget::defaults -x c++ | FileCheck 
--check-prefix=CHECK-METHOD-DEFAULTS %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
SelectorWidget::configure -x c++ | FileCheck --check-prefix=CHECK-METHOD-STATIC 
%s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
SelectorWidget::mismatch -x c++ | FileCheck 
--check-prefix=CHECK-METHOD-MISMATCH %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
SelectorWidget::alias -x c++ | FileCheck --check-prefix=CHECK-METHOD-ALIAS %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
SelectorWidget::aliasPrecedence -x c++ | FileCheck 
--check-prefix=CHECK-METHOD-ALIAS-PRECEDENCE %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
SelectorWidget::multiAlias -x c++ | FileCheck 
--check-prefix=CHECK-METHOD-MULTI-ALIAS %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
SelectorWidget::nullable -x c++ | FileCheck 
--check-prefix=CHECK-METHOD-NULLABILITY %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
SelectorWidget::rawInt -x c++ | FileCheck --check-prefix=CHECK-METHOD-RAW-INT %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
SelectorWidget::constValue -x c++ | FileCheck --check-prefix=CHECK-METHOD-CONST 
%s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps 
-fmodules-cache-path=%t/ModulesCache/WhereParametersSema -fdisable-module-hash 
-fapinotes-modules -I %S/Inputs/Headers %s -ast-dump -ast-dump-filter 
SelectorWidget::operator+ -x c++ | FileCheck 
--check-prefix=CHECK-METHOD-OPERATOR %s
+
+#include "WhereParametersSema.h"
+
+// CHECK-GLOBAL-OVERLOADS: FunctionDecl {{.+}} makeWidget 'void (int)'
+// CHECK-GLOBAL-OVERLOADS-NEXT: ParmVarDecl {{.+}} 'int'
+// CHECK-GLOBAL-OVERLOADS-NEXT: SwiftNameAttr {{.+}} "makeIntWidget(_:)"
+// CHECK-GLOBAL-OVERLOADS: FunctionDecl {{.+}} makeWidget 'void (double)'
+// CHECK-GLOBAL-OVERLOADS-NEXT: ParmVarDecl {{.+}} 'double'
+// CHECK-GLOBAL-OVERLOADS-NEXT: SwiftNameAttr {{.+}} "makeDoubleWidget(_:)"
+// CHECK-GLOBAL-OVERLOADS: FunctionDecl {{.+}} makeWidget 'void ()'
+// CHECK-GLOBAL-OVERLOADS-NEXT: SwiftNameAttr {{.+}} "makeCurrentWidget()"
+
+// CHECK-GLOBAL-BROAD: FunctionDecl {{.+}} broadGlobal 'void (int)'
+// CHECK-GLOBAL-BROAD: SwiftPrivateAttr
+// CHECK-GLOBAL-BROAD: FunctionDecl {{.+}} broadGlobal 'void (double)'
+// CHECK-GLOBAL-BROAD: SwiftPrivateAttr
+
+// CHECK-GLOBAL-COEXIST: FunctionDecl {{.+}} coexistGlobal 'void (int)'
+// CHECK-GLOBAL-COEXIST: SwiftPrivateAttr
+// CHECK-GLOBAL-COEXIST: SwiftNameAttr {{.+}} "coexistGlobalInt(_:)"
+// CHECK-GLOBAL-COEXIST: FunctionDecl {{.+}} coexistGlobal 'void (double)'
+// CHECK-GLOBAL-COEXIST: SwiftPrivateAttr
+// CHECK-GLOBAL-COEXIST-NOT: SwiftNameAttr
+
+// CHECK-GLOBAL-MISMATCH: FunctionDecl {{.+}} mismatchGlobal 'void (float)'
+// CHECK-GLOBAL-MISMATCH-NOT: SwiftNameAttr
+
+// CHECK-GLOBAL-ALIAS: FunctionDecl {{.+}} aliasGlobal 'void (AliasInt)'
+// CHECK-GLOBAL-ALIAS: SwiftNameAttr {{.+}} "aliasGlobal(_:)"
+
+// CHECK-GLOBAL-ALIAS-PRECEDENCE: FunctionDecl {{.+}} aliasPrecedenceGlobal 
'void (AliasInt)'
+// CHECK-GLOBAL-ALIAS-PRECEDENCE-NOT: fallbackAliasPrecedenceGlobal
+// CHECK-GLOBAL-ALIAS-PRECEDENCE: SwiftNameAttr {{.+}} 
"aliasPrecedenceGlobal(_:)"
+
+// CHECK-GLOBAL-MULTI-ALIAS: FunctionDecl {{.+}} multiAliasGlobal 'void 
(DeepAliasInt)'
+// CHECK-GLOBAL-MULTI-ALIAS: SwiftNameAttr {{.+}} "multiAliasGlobal(_:)"
+
+// CHECK-GLOBAL-NULLABILITY: FunctionDecl {{.+}} nullableGlobal 'void (char * 
_Nonnull)'
+// CHECK-GLOBAL-NULLABILITY: SwiftNameAttr {{.+}} "nullableGlobal(_:)"
+
+// CHECK-GLOBAL-RAW-INT: FunctionDecl {{.+}} rawIntGlobal 'void (int)'
+// CHECK-GLOBAL-RAW-INT: SwiftNameAttr {{.+}} "rawIntGlobal(_:)"
+
+// CHECK-GLOBAL-CONST: FunctionDecl {{.+}} constValueGlobal 'void (const int)'
+// CHECK-GLOBAL-CONST: SwiftNameAttr {{.+}} "constValueGlobal(_:)"
+
+// CHECK-GLOBAL-NAMESPACE: FunctionDecl {{.+}} makeNamespaced 'void (int)'
+// CHECK-GLOBAL-NAMESPACE-NEXT: ParmVarDecl {{.+}} 'int'
+// CHECK-GLOBAL-NAMESPACE-NEXT: SwiftNameAttr {{.+}} "makeNamespacedInt(_:)"
+// CHECK-GLOBAL-NAMESPACE: FunctionDecl {{.+}} makeNamespaced 'void (double)'
+// CHECK-GLOBAL-NAMESPACE-NEXT: ParmVarDecl {{.+}} 'double'
+// CHECK-GLOBAL-NAMESPACE-NEXT: SwiftNameAttr {{.+}} "makeNamespacedDouble(_:)"
+
+// CHECK-METHOD-OVERLOADS: CXXMethodDecl {{.+}} setValue 'void (int)'
+// CHECK-METHOD-OVERLOADS-NEXT: ParmVarDecl {{.+}} 'int'
+// CHECK-METHOD-OVERLOADS-NEXT: SwiftNameAttr {{.+}} "setIntValue(_:)"
+// CHECK-METHOD-OVERLOADS: CXXMethodDecl {{.+}} setValue 'void (double)'
+// CHECK-METHOD-OVERLOADS-NEXT: ParmVarDecl {{.+}} 'double'
+// CHECK-METHOD-OVERLOADS-NEXT: SwiftNameAttr {{.+}} "setDoubleValue(_:)"
+// CHECK-METHOD-OVERLOADS: CXXMethodDecl {{.+}} setValue 'void ()'
+// CHECK-METHOD-OVERLOADS-NEXT: SwiftNameAttr {{.+}} "currentValue()"
+
+// CHECK-METHOD-BROAD: CXXMethodDecl {{.+}} broad 'void (int)'
+// CHECK-METHOD-BROAD: SwiftPrivateAttr
+// CHECK-METHOD-BROAD: CXXMethodDecl {{.+}} broad 'void (double)'
+// CHECK-METHOD-BROAD: SwiftPrivateAttr
+
+// CHECK-METHOD-COEXIST: CXXMethodDecl {{.+}} coexist 'void (int)'
+// CHECK-METHOD-COEXIST: SwiftPrivateAttr
+// CHECK-METHOD-COEXIST: SwiftNameAttr {{.+}} "coexistInt(_:)"
+// CHECK-METHOD-COEXIST: CXXMethodDecl {{.+}} coexist 'void (double)'
+// CHECK-METHOD-COEXIST: SwiftPrivateAttr
+// CHECK-METHOD-COEXIST-NOT: SwiftNameAttr
+
+// CHECK-METHOD-DEFAULTS: CXXMethodDecl {{.+}} defaults 'void (int, double)'
+// CHECK-METHOD-DEFAULTS: SwiftNameAttr {{.+}} 
"defaultsWithTwoParameters(_:_:)"
+// CHECK-METHOD-DEFAULTS: CXXMethodDecl {{.+}} defaults 'void (int)'
+// CHECK-METHOD-DEFAULTS-NOT: SwiftNameAttr
+
+// CHECK-METHOD-STATIC: CXXMethodDecl {{.+}} configure 'void (int)' static
+// CHECK-METHOD-STATIC: SwiftNameAttr {{.+}} "configureInt(_:)"
+
+// CHECK-METHOD-MISMATCH: CXXMethodDecl {{.+}} mismatch 'void (float)'
+// CHECK-METHOD-MISMATCH-NOT: SwiftNameAttr
+
+// CHECK-METHOD-ALIAS: CXXMethodDecl {{.+}} alias 'void (AliasInt)'
+// CHECK-METHOD-ALIAS: SwiftNameAttr {{.+}} "alias(_:)"
+
+// CHECK-METHOD-ALIAS-PRECEDENCE: CXXMethodDecl {{.+}} aliasPrecedence 'void 
(AliasInt)'
+// CHECK-METHOD-ALIAS-PRECEDENCE-NOT: fallbackAliasPrecedence
+// CHECK-METHOD-ALIAS-PRECEDENCE: SwiftNameAttr {{.+}} "aliasPrecedence(_:)"
+
+// CHECK-METHOD-MULTI-ALIAS: CXXMethodDecl {{.+}} multiAlias 'void 
(DeepAliasInt)'
+// CHECK-METHOD-MULTI-ALIAS: SwiftNameAttr {{.+}} "multiAlias(_:)"
+
+// CHECK-METHOD-NULLABILITY: CXXMethodDecl {{.+}} nullable 'void (char * 
_Nonnull)'
+// CHECK-METHOD-NULLABILITY: SwiftNameAttr {{.+}} "nullable(_:)"
+
+// CHECK-METHOD-RAW-INT: CXXMethodDecl {{.+}} rawInt 'void (int)'
+// CHECK-METHOD-RAW-INT: SwiftNameAttr {{.+}} "rawInt(_:)"
+
+// CHECK-METHOD-CONST: CXXMethodDecl {{.+}} constValue 'void (const int)'
+// CHECK-METHOD-CONST: SwiftNameAttr {{.+}} "constValue(_:)"
+
+// CHECK-METHOD-OPERATOR: CXXMethodDecl {{.+}} operator+ 'SelectorWidget (int)'
+// CHECK-METHOD-OPERATOR-NEXT: ParmVarDecl {{.+}} 'int'
+// CHECK-METHOD-OPERATOR-NEXT: SwiftNameAttr {{.+}} "plusInt(_:)"
+// CHECK-METHOD-OPERATOR: CXXMethodDecl {{.+}} operator+ 'SelectorWidget 
(double)'
+// CHECK-METHOD-OPERATOR-NEXT: ParmVarDecl {{.+}} 'double'
+// CHECK-METHOD-OPERATOR-NEXT: SwiftNameAttr {{.+}} "plusDouble(_:)"


        
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