[ASTImporter] Propagate error from ImportDeclContext

Summary:
During analysis of one project we failed to import one
CXXDestructorDecl. But since we did not propagate the error in
importDeclContext we had a CXXRecordDecl without a destructor. Then the
analyzer engine had a CallEvent where the nonexistent dtor was requested
(crash).

Solution is to propagate the errors we have during importing a
DeclContext.

Reviewers: a_sidorin, a.sidorin, shafik

Subscribers: rnkovacs, dkrupp, Szelethus, gamesh411, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D63603

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@364752 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 87 insertions, 0 deletions

diff --git a/unittests/AST/ASTImporterTest.cpp b/unittests/AST/ASTImporterTest.cpp
index 41a041f101..215dc10a39 100644
--- a/unittests/AST/ASTImporterTest.cpp
+++ b/unittests/AST/ASTImporterTest.cpp
@@ -4738,6 +4738,93 @@ TEST_P(ErrorHandlingTest, ErrorHappensAfterNodeIsCreatedAndLinked) {
   EXPECT_EQ(OptErr->Error, ImportError::UnsupportedConstruct);
 }
 
+// An error should be set for a class if we cannot import one member.
+TEST_P(ErrorHandlingTest, ErrorIsPropagatedFromMemberToClass) {
+  TranslationUnitDecl *FromTU = getTuDecl(
+      std::string(R"(
+      class X {
+        void f() { )") + ErroneousStmt + R"( } // This member has the error
+                                               // during import.
+        void ok();        // The error should not prevent importing this.
+      };                  // An error will be set for X too.
+      )",
+      Lang_CXX);
+  auto *FromX = FirstDeclMatcher<CXXRecordDecl>().match(
+      FromTU, cxxRecordDecl(hasName("X")));
+  CXXRecordDecl *ImportedX = Import(FromX, Lang_CXX);
+
+  // An error is set for X.
+  EXPECT_FALSE(ImportedX);
+  ASTImporter *Importer = findFromTU(FromX)->Importer.get();
+  Optional<ImportError> OptErr = Importer->getImportDeclErrorIfAny(FromX);
+  ASSERT_TRUE(OptErr);
+  EXPECT_EQ(OptErr->Error, ImportError::UnsupportedConstruct);
+
+  // An error is set for f().
+  auto *FromF = FirstDeclMatcher<CXXMethodDecl>().match(
+      FromTU, cxxMethodDecl(hasName("f")));
+  OptErr = Importer->getImportDeclErrorIfAny(FromF);
+  ASSERT_TRUE(OptErr);
+  EXPECT_EQ(OptErr->Error, ImportError::UnsupportedConstruct);
+  // And any subsequent import should fail.
+  CXXMethodDecl *ImportedF = Import(FromF, Lang_CXX);
+  EXPECT_FALSE(ImportedF);
+
+  // There is no error set for ok().
+  auto *FromOK = FirstDeclMatcher<CXXMethodDecl>().match(
+      FromTU, cxxMethodDecl(hasName("ok")));
+  OptErr = Importer->getImportDeclErrorIfAny(FromOK);
+  EXPECT_FALSE(OptErr);
+  // And we should be able to import.
+  CXXMethodDecl *ImportedOK = Import(FromOK, Lang_CXX);
+  EXPECT_TRUE(ImportedOK);
+
+  // Unwary clients may access X even if the error is set, so, at least make
+  // sure the class is set to be complete.
+  CXXRecordDecl *ToX = cast<CXXRecordDecl>(ImportedOK->getDeclContext());
+  EXPECT_TRUE(ToX->isCompleteDefinition());
+}
+
+TEST_P(ErrorHandlingTest, ErrorIsNotPropagatedFromMemberToNamespace) {
+  TranslationUnitDecl *FromTU = getTuDecl(
+      std::string(R"(
+      namespace X {
+        void f() { )") + ErroneousStmt + R"( } // This member has the error
+                                               // during import.
+        void ok();        // The error should not prevent importing this.
+      };                  // An error will be set for X too.
+      )",
+      Lang_CXX);
+  auto *FromX = FirstDeclMatcher<NamespaceDecl>().match(
+      FromTU, namespaceDecl(hasName("X")));
+  NamespaceDecl *ImportedX = Import(FromX, Lang_CXX);
+
+  // There is no error set for X.
+  EXPECT_TRUE(ImportedX);
+  ASTImporter *Importer = findFromTU(FromX)->Importer.get();
+  Optional<ImportError> OptErr = Importer->getImportDeclErrorIfAny(FromX);
+  ASSERT_FALSE(OptErr);
+
+  // An error is set for f().
+  auto *FromF = FirstDeclMatcher<FunctionDecl>().match(
+      FromTU, functionDecl(hasName("f")));
+  OptErr = Importer->getImportDeclErrorIfAny(FromF);
+  ASSERT_TRUE(OptErr);
+  EXPECT_EQ(OptErr->Error, ImportError::UnsupportedConstruct);
+  // And any subsequent import should fail.
+  FunctionDecl *ImportedF = Import(FromF, Lang_CXX);
+  EXPECT_FALSE(ImportedF);
+
+  // There is no error set for ok().
+  auto *FromOK = FirstDeclMatcher<FunctionDecl>().match(
+      FromTU, functionDecl(hasName("ok")));
+  OptErr = Importer->getImportDeclErrorIfAny(FromOK);
+  EXPECT_FALSE(OptErr);
+  // And we should be able to import.
+  FunctionDecl *ImportedOK = Import(FromOK, Lang_CXX);
+  EXPECT_TRUE(ImportedOK);
+}
+
 INSTANTIATE_TEST_CASE_P(ParameterizedTests, ErrorHandlingTest,
                         DefaultTestValuesForRunOptions, );