[NFC] [Decl] Introduce Decl::isFromExplicitGlobalModule

Introduce `Decl::isFromExplicitGlobalModule` to replace the
`D->getOwningModule() && D->getOwningModule()->isExplicitGlobalModule()`
pattern to save some typings.

Author: ChuanqiXu9

clang/include/clang/AST/DeclBase.h

@@ -669,9 +669,8 @@ class alignas(8) Decl {
   /// Whether this declaration comes from another module unit.
   bool isInAnotherModuleUnit() const;
 
-  /// FIXME: Implement discarding declarations actually in global module
-  /// fragment. See [module.global.frag]p3,4 for details.
-  bool isDiscardedInGlobalModuleFragment() const { return false; }
+  /// Whether this declaration comes from explicit global module.
+  bool isFromExplicitGlobalModule() const;
 
   /// Check if we should skip checking ODRHash for declaration \param D.
   ///

clang/lib/AST/DeclBase.cpp

@@ -1102,9 +1102,13 @@ bool Decl::isInAnotherModuleUnit() const {
   return M != getASTContext().getCurrentNamedModule();
 }
 
+bool Decl::isFromExplicitGlobalModule() const {
+  return getOwningModule() && getOwningModule()->isExplicitGlobalModule();
+}
+
 bool Decl::shouldSkipCheckingODR() const {
-  return getASTContext().getLangOpts().SkipODRCheckInGMF && getOwningModule() &&
-         getOwningModule()->isExplicitGlobalModule();
+  return getASTContext().getLangOpts().SkipODRCheckInGMF &&
+         isFromExplicitGlobalModule();
 }
 
 static Decl::Kind getKind(const Decl *D) { return D->getKind(); }

clang/lib/Sema/SemaDecl.cpp

@@ -9915,7 +9915,7 @@ Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC,
     // FIXME: We need a better way to separate C++ standard and clang modules.
     bool ImplicitInlineCXX20 = !getLangOpts().CPlusPlusModules ||
                                !NewFD->getOwningModule() ||
-                               NewFD->getOwningModule()->isGlobalModule() ||
+                               NewFD->isFromExplicitGlobalModule() ||
                                NewFD->getOwningModule()->isHeaderLikeModule();
     bool isInline = D.getDeclSpec().isInlineSpecified();
     bool isVirtual = D.getDeclSpec().isVirtualSpecified();

clang/unittests/AST/DeclTest.cpp

@@ -429,7 +429,7 @@ TEST(Decl, ImplicitlyDeclaredAllocationFunctionsInModules) {
                 .bind("operator new"),
             Ctx));
   ASSERT_TRUE(SizedOperatorNew->getOwningModule());
-  EXPECT_TRUE(SizedOperatorNew->getOwningModule()->isGlobalModule());
+  EXPECT_TRUE(SizedOperatorNew->isFromExplicitGlobalModule());
 
   // void* operator new(std::size_t, std::align_val_t);
   auto *SizedAlignedOperatorNew = selectFirst<FunctionDecl>(
@@ -441,7 +441,7 @@ TEST(Decl, ImplicitlyDeclaredAllocationFunctionsInModules) {
                 .bind("operator new"),
             Ctx));
   ASSERT_TRUE(SizedAlignedOperatorNew->getOwningModule());
-  EXPECT_TRUE(SizedAlignedOperatorNew->getOwningModule()->isGlobalModule());
+  EXPECT_TRUE(SizedAlignedOperatorNew->isFromExplicitGlobalModule());
 
   // void* operator new[](std::size_t);
   auto *SizedArrayOperatorNew = selectFirst<FunctionDecl>(
@@ -451,7 +451,7 @@ TEST(Decl, ImplicitlyDeclaredAllocationFunctionsInModules) {
                 .bind("operator new[]"),
             Ctx));
   ASSERT_TRUE(SizedArrayOperatorNew->getOwningModule());
-  EXPECT_TRUE(SizedArrayOperatorNew->getOwningModule()->isGlobalModule());
+  EXPECT_TRUE(SizedArrayOperatorNew->isFromExplicitGlobalModule());
 
   // void* operator new[](std::size_t, std::align_val_t);
   auto *SizedAlignedArrayOperatorNew = selectFirst<FunctionDecl>(
@@ -464,7 +464,7 @@ TEST(Decl, ImplicitlyDeclaredAllocationFunctionsInModules) {
             Ctx));
   ASSERT_TRUE(SizedAlignedArrayOperatorNew->getOwningModule());
   EXPECT_TRUE(
-      SizedAlignedArrayOperatorNew->getOwningModule()->isGlobalModule());
+      SizedAlignedArrayOperatorNew->isFromExplicitGlobalModule());
 
   // void operator delete(void*) noexcept;
   auto *Delete = selectFirst<FunctionDecl>(
@@ -475,7 +475,7 @@ TEST(Decl, ImplicitlyDeclaredAllocationFunctionsInModules) {
                 .bind("operator delete"),
             Ctx));
   ASSERT_TRUE(Delete->getOwningModule());
-  EXPECT_TRUE(Delete->getOwningModule()->isGlobalModule());
+  EXPECT_TRUE(Delete->isFromExplicitGlobalModule());
 
   // void operator delete(void*, std::align_val_t) noexcept;
   auto *AlignedDelete = selectFirst<FunctionDecl>(
@@ -487,7 +487,7 @@ TEST(Decl, ImplicitlyDeclaredAllocationFunctionsInModules) {
                 .bind("operator delete"),
             Ctx));
   ASSERT_TRUE(AlignedDelete->getOwningModule());
-  EXPECT_TRUE(AlignedDelete->getOwningModule()->isGlobalModule());
+  EXPECT_TRUE(AlignedDelete->isFromExplicitGlobalModule());
 
   // Sized deallocation is not enabled by default. So we skip it here.
 
@@ -500,7 +500,7 @@ TEST(Decl, ImplicitlyDeclaredAllocationFunctionsInModules) {
                 .bind("operator delete[]"),
             Ctx));
   ASSERT_TRUE(ArrayDelete->getOwningModule());
-  EXPECT_TRUE(ArrayDelete->getOwningModule()->isGlobalModule());
+  EXPECT_TRUE(ArrayDelete->isFromExplicitGlobalModule());
 
   // void operator delete[](void*, std::align_val_t) noexcept;
   auto *AlignedArrayDelete = selectFirst<FunctionDecl>(
@@ -512,7 +512,7 @@ TEST(Decl, ImplicitlyDeclaredAllocationFunctionsInModules) {
                 .bind("operator delete[]"),
             Ctx));
   ASSERT_TRUE(AlignedArrayDelete->getOwningModule());
-  EXPECT_TRUE(AlignedArrayDelete->getOwningModule()->isGlobalModule());
+  EXPECT_TRUE(AlignedArrayDelete->isFromExplicitGlobalModule());
 }
 
 TEST(Decl, TemplateArgumentDefaulted) {