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#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/AST/ASTStructuralEquivalence.h"
#include "clang/Frontend/ASTUnit.h"
#include "clang/Tooling/Tooling.h"
#include "Language.h"
#include "DeclMatcher.h"
#include "gtest/gtest.h"
namespace clang {
namespace ast_matchers {
using std::get;
struct StructuralEquivalenceTest : ::testing::Test {
std::unique_ptr<ASTUnit> AST0, AST1;
std::string Code0, Code1; // Buffers for SourceManager
// Get a pair of Decl pointers to the synthetised declarations from the given
// code snipets. By default we search for the unique Decl with name 'foo' in
// both snippets.
std::tuple<NamedDecl *, NamedDecl *>
makeNamedDecls(const std::string &SrcCode0, const std::string &SrcCode1,
Language Lang, const char *const Identifier = "foo") {
this->Code0 = SrcCode0;
this->Code1 = SrcCode1;
ArgVector Args = getBasicRunOptionsForLanguage(Lang);
const char *const InputFileName = "input.cc";
AST0 = tooling::buildASTFromCodeWithArgs(Code0, Args, InputFileName);
AST1 = tooling::buildASTFromCodeWithArgs(Code1, Args, InputFileName);
ASTContext &Ctx0 = AST0->getASTContext(), &Ctx1 = AST1->getASTContext();
auto getDecl = [](ASTContext &Ctx, const std::string &Name) -> NamedDecl * {
IdentifierInfo *SearchedII = &Ctx.Idents.get(Name);
assert(SearchedII && "Declaration with the identifier "
"should be specified in test!");
DeclarationName SearchDeclName(SearchedII);
SmallVector<NamedDecl *, 4> FoundDecls;
Ctx.getTranslationUnitDecl()->localUncachedLookup(SearchDeclName,
FoundDecls);
// We should find one Decl but one only.
assert(FoundDecls.size() == 1);
return FoundDecls[0];
};
NamedDecl *D0 = getDecl(Ctx0, Identifier);
NamedDecl *D1 = getDecl(Ctx1, Identifier);
assert(D0);
assert(D1);
return std::make_tuple(D0, D1);
}
bool testStructuralMatch(NamedDecl *D0, NamedDecl *D1) {
llvm::DenseSet<std::pair<Decl *, Decl *>> NonEquivalentDecls;
StructuralEquivalenceContext Ctx(D0->getASTContext(), D1->getASTContext(),
NonEquivalentDecls, false, false);
return Ctx.IsStructurallyEquivalent(D0, D1);
}
bool testStructuralMatch(std::tuple<NamedDecl *, NamedDecl *> t) {
return testStructuralMatch(get<0>(t), get<1>(t));
}
};
TEST_F(StructuralEquivalenceTest, Int) {
auto Decls = makeNamedDecls("int foo;", "int foo;", Lang_CXX);
EXPECT_TRUE(testStructuralMatch(Decls));
}
TEST_F(StructuralEquivalenceTest, IntVsSignedInt) {
auto Decls = makeNamedDecls("int foo;", "signed int foo;", Lang_CXX);
EXPECT_TRUE(testStructuralMatch(Decls));
}
TEST_F(StructuralEquivalenceTest, Char) {
auto Decls = makeNamedDecls("char foo;", "char foo;", Lang_CXX);
EXPECT_TRUE(testStructuralMatch(Decls));
}
// This test is disabled for now.
// FIXME Whether this is equivalent is dependendant on the target.
TEST_F(StructuralEquivalenceTest, DISABLED_CharVsSignedChar) {
auto Decls = makeNamedDecls("char foo;", "signed char foo;", Lang_CXX);
EXPECT_FALSE(testStructuralMatch(Decls));
}
TEST_F(StructuralEquivalenceTest, ForwardRecordDecl) {
auto Decls = makeNamedDecls("struct foo;", "struct foo;", Lang_CXX);
EXPECT_TRUE(testStructuralMatch(Decls));
}
TEST_F(StructuralEquivalenceTest, IntVsSignedIntInStruct) {
auto Decls = makeNamedDecls("struct foo { int x; };",
"struct foo { signed int x; };", Lang_CXX);
EXPECT_TRUE(testStructuralMatch(Decls));
}
TEST_F(StructuralEquivalenceTest, CharVsSignedCharInStruct) {
auto Decls = makeNamedDecls("struct foo { char x; };",
"struct foo { signed char x; };", Lang_CXX);
EXPECT_FALSE(testStructuralMatch(Decls));
}
TEST_F(StructuralEquivalenceTest, IntVsSignedIntTemplateSpec) {
auto Decls = makeNamedDecls(
"template <class T> struct foo; template<> struct foo<int>{};",
"template <class T> struct foo; template<> struct foo<signed int>{};",
Lang_CXX);
ClassTemplateSpecializationDecl *Spec0 =
*cast<ClassTemplateDecl>(get<0>(Decls))->spec_begin();
ClassTemplateSpecializationDecl *Spec1 =
*cast<ClassTemplateDecl>(get<1>(Decls))->spec_begin();
ASSERT_TRUE(Spec0 != nullptr);
ASSERT_TRUE(Spec1 != nullptr);
EXPECT_TRUE(testStructuralMatch(Spec0, Spec1));
}
TEST_F(StructuralEquivalenceTest, CharVsSignedCharTemplateSpec) {
auto Decls = makeNamedDecls(
"template <class T> struct foo; template<> struct foo<char>{};",
"template <class T> struct foo; template<> struct foo<signed char>{};",
Lang_CXX);
ClassTemplateSpecializationDecl *Spec0 =
*cast<ClassTemplateDecl>(get<0>(Decls))->spec_begin();
ClassTemplateSpecializationDecl *Spec1 =
*cast<ClassTemplateDecl>(get<1>(Decls))->spec_begin();
ASSERT_TRUE(Spec0 != nullptr);
ASSERT_TRUE(Spec1 != nullptr);
EXPECT_FALSE(testStructuralMatch(Spec0, Spec1));
}
TEST_F(StructuralEquivalenceTest, CharVsSignedCharTemplateSpecWithInheritance) {
auto Decls = makeNamedDecls(
R"(
struct true_type{};
template <class T> struct foo;
template<> struct foo<char> : true_type {};
)",
R"(
struct true_type{};
template <class T> struct foo;
template<> struct foo<signed char> : true_type {};
)",
Lang_CXX);
ClassTemplateSpecializationDecl *Spec0 =
*cast<ClassTemplateDecl>(get<0>(Decls))->spec_begin();
ClassTemplateSpecializationDecl *Spec1 =
*cast<ClassTemplateDecl>(get<1>(Decls))->spec_begin();
ASSERT_TRUE(Spec0 != nullptr);
ASSERT_TRUE(Spec1 != nullptr);
EXPECT_FALSE(testStructuralMatch(Spec0, Spec1));
}
// This test is disabled for now.
// FIXME Enable it, once the check is implemented.
TEST_F(StructuralEquivalenceTest, DISABLED_WrongOrderInNamespace) {
auto Code =
R"(
namespace NS {
template <class T> class Base {
int a;
};
class Derived : Base<Derived> {
};
}
void foo(NS::Derived &);
)";
auto Decls = makeNamedDecls(Code, Code, Lang_CXX);
NamespaceDecl *NS =
LastDeclMatcher<NamespaceDecl>().match(get<1>(Decls), namespaceDecl());
ClassTemplateDecl *TD = LastDeclMatcher<ClassTemplateDecl>().match(
get<1>(Decls), classTemplateDecl(hasName("Base")));
// Reorder the decls, move the TD to the last place in the DC.
NS->removeDecl(TD);
NS->addDeclInternal(TD);
EXPECT_FALSE(testStructuralMatch(Decls));
}
TEST_F(StructuralEquivalenceTest, WrongOrderOfFieldsInClass) {
auto Code = "class X { int a; int b; };";
auto Decls = makeNamedDecls(Code, Code, Lang_CXX, "X");
CXXRecordDecl *RD = FirstDeclMatcher<CXXRecordDecl>().match(
get<1>(Decls), cxxRecordDecl(hasName("X")));
FieldDecl *FD =
FirstDeclMatcher<FieldDecl>().match(get<1>(Decls), fieldDecl(hasName("a")));
// Reorder the FieldDecls
RD->removeDecl(FD);
RD->addDeclInternal(FD);
EXPECT_FALSE(testStructuralMatch(Decls));
}
} // end namespace ast_matchers
} // end namespace clang
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