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[ASTImporter][Structural Eq] Check for isBeingDefined

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Summary:
If one definition is currently being defined, we do not compare for
equality and we assume that the decls are equal.

Reviewers: a_sidorin, a.sidorin, shafik

Reviewed By: a_sidorin

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

Differential Revision: https://reviews.llvm.org/D53697

llvm-svn: 347564
This commit is contained in:
Gabor Marton 2018-11-26 15:54:08 +00:00
parent 4d3d82eef9
commit 17d39677e0
3 changed files with 49 additions and 3 deletions
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5
clang/lib/AST/ASTImporter.cpp
View File

@ -1740,8 +1740,9 @@ Error ASTNodeImporter::ImportDefinition(
return Err;
// Add base classes.
if (auto *ToCXX = dyn_cast<CXXRecordDecl>(To)) {
auto *FromCXX = cast<CXXRecordDecl>(From);
auto *ToCXX = dyn_cast<CXXRecordDecl>(To);
auto *FromCXX = dyn_cast<CXXRecordDecl>(From);
if (ToCXX && FromCXX && ToCXX->dataPtr() && FromCXX->dataPtr()) {
struct CXXRecordDecl::DefinitionData &ToData = ToCXX->data();
struct CXXRecordDecl::DefinitionData &FromData = FromCXX->data();

8
clang/lib/AST/ASTStructuralEquivalence.cpp
View File

@ -1016,7 +1016,8 @@ static bool IsStructurallyEquivalent(StructuralEquivalenceContext &Context,
return false;
// Compare the definitions of these two records. If either or both are
// incomplete, we assume that they are equivalent.
// incomplete (i.e. it is a forward decl), we assume that they are
// equivalent.
D1 = D1->getDefinition();
D2 = D2->getDefinition();
if (!D1 || !D2)
@ -1031,6 +1032,11 @@ static bool IsStructurallyEquivalent(StructuralEquivalenceContext &Context,
if (D1->hasExternalLexicalStorage() || D2->hasExternalLexicalStorage())
return true;
// If one definition is currently being defined, we do not compare for
// equality and we assume that the decls are equal.
if (D1->isBeingDefined() || D2->isBeingDefined())
return true;
if (auto *D1CXX = dyn_cast<CXXRecordDecl>(D1)) {
if (auto *D2CXX = dyn_cast<CXXRecordDecl>(D2)) {
if (D1CXX->hasExternalLexicalStorage() &&

39
clang/unittests/AST/ASTImporterTest.cpp
View File

@ -3725,6 +3725,45 @@ TEST_P(ImportFunctionTemplateSpecializations, DefinitionThenPrototype) {
EXPECT_EQ(To1->getPreviousDecl(), To0);
}
TEST_P(ASTImporterTestBase,
ImportShouldNotReportFalseODRErrorWhenRecordIsBeingDefined) {
{
Decl *FromTU = getTuDecl(
R"(
template <typename T>
struct B;
)",
Lang_CXX, "input0.cc");
auto *FromD = FirstDeclMatcher<ClassTemplateDecl>().match(
FromTU, classTemplateDecl(hasName("B")));
Import(FromD, Lang_CXX);
}
{
Decl *FromTU = getTuDecl(
R"(
template <typename T>
struct B {
void f();
B* b;
};
)",
Lang_CXX, "input1.cc");
FunctionDecl *FromD = FirstDeclMatcher<FunctionDecl>().match(
FromTU, functionDecl(hasName("f")));
Import(FromD, Lang_CXX);
auto *FromCTD = FirstDeclMatcher<ClassTemplateDecl>().match(
FromTU, classTemplateDecl(hasName("B")));
auto *ToCTD = cast<ClassTemplateDecl>(Import(FromCTD, Lang_CXX));
EXPECT_TRUE(ToCTD->isThisDeclarationADefinition());
// We expect no (ODR) warning during the import.
auto *ToTU = ToAST->getASTContext().getTranslationUnitDecl();
EXPECT_EQ(0u, ToTU->getASTContext().getDiagnostics().getNumWarnings());
}
}
INSTANTIATE_TEST_CASE_P(ParameterizedTests, DeclContextTest,
::testing::Values(ArgVector()), );