From 93a64efcd3358e85ca24da11d6fa765d01dd6e45 Mon Sep 17 00:00:00 2001
From: Davide Italiano <davide@freebsd.org>
Date: Tue, 30 Oct 2018 20:46:29 +0000
Subject: [PATCH] Revert "[ASTImporter] Reorder fields after structure import
 is finished"

This reverts commit r345545 because it breaks some lldb tests.

llvm-svn: 345643
---
 clang/lib/AST/ASTImporter.cpp           | 46 +++------------------------------
 clang/unittests/AST/ASTImporterTest.cpp | 13 +---------
 2 files changed, 4 insertions(+), 55 deletions(-)

diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
index 7498e0b..0b1bef1 100644
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -1658,53 +1658,13 @@ ASTNodeImporter::ImportDeclContext(DeclContext *FromDC, bool ForceImport) {
     auto ToDCOrErr = Importer.ImportContext(FromDC);
     return ToDCOrErr.takeError();
   }
-
-  const auto *FromRD = dyn_cast<RecordDecl>(FromDC);
+  llvm::SmallVector<Decl *, 8> ImportedDecls;
   for (auto *From : FromDC->decls()) {
     ExpectedDecl ImportedOrErr = import(From);
-    if (!ImportedOrErr) {
-      // For RecordDecls, failed import of a field will break the layout of the
-      // structure. Handle it as an error.
-      if (FromRD)
-        return ImportedOrErr.takeError();
+    if (!ImportedOrErr)
       // Ignore the error, continue with next Decl.
       // FIXME: Handle this case somehow better.
-      else
-        consumeError(ImportedOrErr.takeError());
-    }
-  }
-
-  // Reorder declarations in RecordDecls because they may have another
-  // order. Keeping field order is vitable because it determines structure
-  // layout.
-  // FIXME: This is an ugly fix. Unfortunately, I cannot come with better
-  // solution for this issue. We cannot defer expression import here because
-  // type import can depend on them.
-  if (!FromRD)
-    return Error::success();
-
-  auto ImportedDC = import(cast<Decl>(FromDC));
-  assert(ImportedDC);
-  auto *ToRD = cast<RecordDecl>(*ImportedDC);
-
-  for (auto *D : FromRD->decls()) {
-    if (isa<FieldDecl>(D) || isa<FriendDecl>(D)) {
-      Decl *ToD = Importer.GetAlreadyImportedOrNull(D);
-      assert(ToRD == ToD->getDeclContext() && ToRD->containsDecl(ToD));
-      ToRD->removeDecl(ToD);
-    }
-  }
-
-  assert(ToRD->field_empty());
-
-  for (auto *D : FromRD->decls()) {
-    if (isa<FieldDecl>(D) || isa<FriendDecl>(D)) {
-      Decl *ToD = Importer.GetAlreadyImportedOrNull(D);
-      assert(ToRD == ToD->getDeclContext());
-      assert(ToRD == ToD->getLexicalDeclContext());
-      assert(!ToRD->containsDecl(ToD));
-      ToRD->addDeclInternal(ToD);
-    }
+      consumeError(ImportedOrErr.takeError());
   }
 
   return Error::success();
diff --git a/clang/unittests/AST/ASTImporterTest.cpp b/clang/unittests/AST/ASTImporterTest.cpp
index de4cbfa..d1683cd 100644
--- a/clang/unittests/AST/ASTImporterTest.cpp
+++ b/clang/unittests/AST/ASTImporterTest.cpp
@@ -1457,7 +1457,7 @@ TEST_P(ASTImporterTestBase, CXXRecordDeclFieldsShouldBeInCorrectOrder) {
 }
 
 TEST_P(ASTImporterTestBase,
-       CXXRecordDeclFieldOrderShouldNotDependOnImportOrder) {
+       DISABLED_CXXRecordDeclFieldOrderShouldNotDependOnImportOrder) {
   Decl *From, *To;
   std::tie(From, To) = getImportedDecl(
       // The original recursive algorithm of ASTImporter first imports 'c' then
@@ -3767,16 +3767,5 @@ INSTANTIATE_TEST_CASE_P(ParameterizedTests, ImportImplicitMethods,
 INSTANTIATE_TEST_CASE_P(ParameterizedTests, ImportVariables,
                         DefaultTestValuesForRunOptions, );
 
-TEST_P(ImportDecl, ImportFieldOrder) {
-  MatchVerifier<Decl> Verifier;
-  testImport("struct declToImport {"
-             "  int b = a + 2;"
-             "  int a = 5;"
-             "};",
-             Lang_CXX11, "", Lang_CXX11, Verifier,
-             recordDecl(hasFieldOrder({"b", "a"})));
-}
-
-
 } // end namespace ast_matchers
 } // end namespace clang
-- 
2.7.4