[CIR] Upstream non-record array init handling (#169429)

This upstreams the code to handle member initialization for non-record
arrays.

Author: andykaylor

clang/lib/CIR/CodeGen/CIRGenCXXABI.h

@@ -192,6 +192,9 @@ class CIRGenCXXABI {
                                        QualType elementType,
                                        const CXXDestructorDecl *dtor) = 0;
 
+  virtual size_t getSrcArgforCopyCtor(const CXXConstructorDecl *,
+                                      FunctionArgList &args) const = 0;
+
   /// Checks if ABI requires extra virtual offset for vtable field.
   virtual bool
   isVirtualOffsetNeededForVTableField(CIRGenFunction &cgf,

clang/lib/CIR/CodeGen/CIRGenClass.cpp

@@ -111,8 +111,24 @@ static void emitMemberInitializer(CIRGenFunction &cgf,
     // NOTE(cir): CodeGen allows record types to be memcpy'd if applicable,
     // whereas ClangIR wants to represent all object construction explicitly.
     if (!baseElementTy->isRecordType()) {
-      cgf.cgm.errorNYI(memberInit->getSourceRange(),
-                       "emitMemberInitializer: array of non-record type");
+      unsigned srcArgIndex =
+          cgf.cgm.getCXXABI().getSrcArgforCopyCtor(constructor, args);
+      cir::LoadOp srcPtr = cgf.getBuilder().createLoad(
+          cgf.getLoc(memberInit->getSourceLocation()),
+          cgf.getAddrOfLocalVar(args[srcArgIndex]));
+      LValue thisRhslv = cgf.makeNaturalAlignAddrLValue(srcPtr, recordTy);
+      LValue src = cgf.emitLValueForFieldInitialization(thisRhslv, field,
+                                                        field->getName());
+
+      // Copy the aggregate.
+      cgf.emitAggregateCopy(lhs, src, fieldType,
+                            cgf.getOverlapForFieldInit(field),
+                            lhs.isVolatileQualified());
+      // Ensure that we destroy the objects if an exception is thrown later in
+      // the constructor.
+      QualType::DestructionKind dtorKind = fieldType.isDestructedType();
+      assert(!cgf.needsEHCleanup(dtorKind) &&
+             "Arrays of non-record types shouldn't need EH cleanup");
       return;
     }
   }

clang/lib/CIR/CodeGen/CIRGenItaniumCXXABI.cpp

@@ -123,6 +123,12 @@ class CIRGenItaniumCXXABI : public CIRGenCXXABI {
     return true;
   }
 
+  size_t getSrcArgforCopyCtor(const CXXConstructorDecl *,
+                              FunctionArgList &args) const override {
+    assert(!args.empty() && "expected the arglist to not be empty!");
+    return args.size() - 1;
+  }
+
   void emitBadCastCall(CIRGenFunction &cgf, mlir::Location loc) override;
 
   mlir::Value

clang/test/CIR/CodeGen/copy-constructor.cpp

@@ -0,0 +1,52 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -mconstructor-aliases -fclangir -emit-cir %s -o %t.cir
+// RUN: FileCheck --check-prefix=CIR --input-file=%t.cir %s
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -mconstructor-aliases -fclangir -emit-llvm %s -o %t-cir.ll
+// RUN: FileCheck --check-prefix=LLVM --input-file=%t-cir.ll %s
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -mconstructor-aliases -emit-llvm %s -o %t.ll
+// RUN: FileCheck --check-prefix=OGCG --input-file=%t.ll %s
+
+struct HasScalarArrayMember {
+  int arr[2][2];
+  HasScalarArrayMember(const HasScalarArrayMember &);
+};
+
+HasScalarArrayMember::HasScalarArrayMember(const HasScalarArrayMember &) = default;
+
+// CIR-LABEL: cir.func dso_local @_ZN20HasScalarArrayMemberC2ERKS_(
+// CIR-NEXT:    %[[THIS:.*]] = cir.alloca !cir.ptr<!rec_HasScalarArrayMember>
+// CIR-NEXT:    %[[OTHER:.*]] = cir.alloca !cir.ptr<!rec_HasScalarArrayMember>
+// CIR-NEXT:    cir.store %arg0, %[[THIS]]
+// CIR-NEXT:    cir.store %arg1, %[[OTHER]]
+// CIR-NEXT:    %[[THIS_LOAD:.*]] = cir.load{{.*}} %[[THIS]]
+// CIR-NEXT:    %[[THIS_ARR:.*]] = cir.get_member %[[THIS_LOAD]][0] {name = "arr"}
+// CIR-NEXT:    %[[OTHER_LOAD:.*]] = cir.load{{.*}} %[[OTHER]]
+// CIR-NEXT:    %[[OTHER_ARR:.*]] = cir.get_member %[[OTHER_LOAD]][0] {name = "arr"}
+// CIR-NEXT:    cir.copy %[[OTHER_ARR]] to %[[THIS_ARR]] : !cir.ptr<!cir.array<!cir.array<!s32i x 2> x 2>>
+// CIR-NEXT:    cir.return
+
+// LLVM-LABEL: define {{.*}} @_ZN20HasScalarArrayMemberC2ERKS_(
+// LLVM-SAME:      ptr %[[ARG0:.*]], ptr %[[ARG1:.*]])
+// LLVM-NEXT:    %[[THIS:.*]] = alloca ptr
+// LLVM-NEXT:    %[[OTHER:.*]] = alloca ptr
+// LLVM-NEXT:    store ptr %[[ARG0]], ptr %[[THIS]]
+// LLVM-NEXT:    store ptr %[[ARG1]], ptr %[[OTHER]]
+// LLVM-NEXT:    %[[THIS_LOAD:.*]] = load ptr, ptr %[[THIS]]
+// LLVM-NEXT:    %[[THIS_ARR:.*]] = getelementptr %struct.HasScalarArrayMember, ptr %[[THIS_LOAD]], i32 0, i32 0
+// LLVM-NEXT:    %[[OTHER_LOAD:.*]] = load ptr, ptr %[[OTHER]]
+// LLVM-NEXT:    %[[OTHER_ARR:.*]] = getelementptr %struct.HasScalarArrayMember, ptr %[[OTHER_LOAD]], i32 0, i32 0
+// LLVM-NEXT:    call void @llvm.memcpy.p0.p0.i32(ptr %[[THIS_ARR]], ptr %[[OTHER_ARR]], i32 16, i1 false)
+// LLVM-NEXT:    ret void
+
+// OGCG-LABEL: define {{.*}} @_ZN20HasScalarArrayMemberC2ERKS_(
+// OGCG-SAME:      ptr {{.*}} %[[ARG0:.*]], ptr {{.*}} %[[ARG1:.*]])
+// OGCG-NEXT:  entry:
+// OGCG-NEXT:    %[[THIS:.*]] = alloca ptr
+// OGCG-NEXT:    %[[OTHER:.*]] = alloca ptr
+// OGCG-NEXT:    store ptr %[[ARG0]], ptr %[[THIS]]
+// OGCG-NEXT:    store ptr %[[ARG1]], ptr %[[OTHER]]
+// OGCG-NEXT:    %[[THIS_LOAD:.*]] = load ptr, ptr %[[THIS]]
+// OGCG-NEXT:    %[[THIS_ARR:.*]] = getelementptr inbounds nuw %struct.HasScalarArrayMember, ptr %[[THIS_LOAD]], i32 0, i32 0
+// OGCG-NEXT:    %[[OTHER_LOAD:.*]] = load ptr, ptr %[[OTHER]]
+// OGCG-NEXT:    %[[OTHER_ARR:.*]] = getelementptr inbounds nuw %struct.HasScalarArrayMember, ptr %[[OTHER_LOAD]], i32 0, i32 0
+// OGCG-NEXT:    call void @llvm.memcpy.p0.p0.i64(ptr {{.*}} %[[THIS_ARR]], ptr {{.*}} %[[OTHER_ARR]], i64 16, i1 false)
+// OGCG-NEXT:    ret void