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//===- unittests/Analysis/FlowSensitive/ASTOpsTest.cpp --------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang/Analysis/FlowSensitive/ASTOps.h"
#include "TestingSupport.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclCXX.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/Basic/LLVM.h"
#include "clang/Frontend/ASTUnit.h"
#include "clang/Tooling/Tooling.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include <memory>
#include <string>
namespace {
using namespace clang;
using namespace dataflow;
using ast_matchers::cxxMethodDecl;
using ast_matchers::cxxRecordDecl;
using ast_matchers::hasName;
using ast_matchers::hasType;
using ast_matchers::initListExpr;
using ast_matchers::match;
using ast_matchers::selectFirst;
using test::findValueDecl;
using testing::IsEmpty;
using testing::UnorderedElementsAre;
TEST(ASTOpsTest, RecordInitListHelperOnEmptyUnionInitList) {
// This is a regression test: The `RecordInitListHelper` used to assert-fail
// when called for the `InitListExpr` of an empty union.
std::string Code = R"cc(
struct S {
S() : UField{} {};
union U {} UField;
};
)cc";
std::unique_ptr<ASTUnit> Unit =
tooling::buildASTFromCodeWithArgs(Code, {"-fsyntax-only", "-std=c++17"});
auto &ASTCtx = Unit->getASTContext();
ASSERT_EQ(ASTCtx.getDiagnostics().getClient()->getNumErrors(), 0U);
auto *InitList = selectFirst<InitListExpr>(
"init",
match(initListExpr(hasType(cxxRecordDecl(hasName("U")))).bind("init"),
ASTCtx));
ASSERT_NE(InitList, nullptr);
RecordInitListHelper Helper(InitList);
EXPECT_THAT(Helper.base_inits(), IsEmpty());
EXPECT_THAT(Helper.field_inits(), IsEmpty());
}
TEST(ASTOpsTest, ReferencedDeclsOnUnionInitList) {
// This is a regression test: `getReferencedDecls()` used to return a null
// `FieldDecl` in this case (in addition to the correct non-null `FieldDecl`)
// because `getInitializedFieldInUnion()` returns null for the syntactic form
// of the `InitListExpr`.
std::string Code = R"cc(
struct S {
S() : UField{0} {};
union U {
int I;
} UField;
};
)cc";
std::unique_ptr<ASTUnit> Unit =
tooling::buildASTFromCodeWithArgs(Code, {"-fsyntax-only", "-std=c++17"});
auto &ASTCtx = Unit->getASTContext();
ASSERT_EQ(ASTCtx.getDiagnostics().getClient()->getNumErrors(), 0U);
auto *InitList = selectFirst<InitListExpr>(
"init",
match(initListExpr(hasType(cxxRecordDecl(hasName("U")))).bind("init"),
ASTCtx));
ASSERT_NE(InitList, nullptr);
auto *IDecl = cast<FieldDecl>(findValueDecl(ASTCtx, "I"));
EXPECT_THAT(getReferencedDecls(*InitList).Fields,
UnorderedElementsAre(IDecl));
}
TEST(ASTOpsTest, ReferencedDeclsLocalsNotParamsOrStatics) {
std::string Code = R"cc(
void func(int Param) {
static int Static = 0;
int Local = Param;
Local = Static;
}
)cc";
std::unique_ptr<ASTUnit> Unit =
tooling::buildASTFromCodeWithArgs(Code, {"-fsyntax-only", "-std=c++17"});
auto &ASTCtx = Unit->getASTContext();
ASSERT_EQ(ASTCtx.getDiagnostics().getClient()->getNumErrors(), 0U);
auto *Func = cast<FunctionDecl>(findValueDecl(ASTCtx, "func"));
ASSERT_NE(Func, nullptr);
auto *LocalDecl = cast<VarDecl>(findValueDecl(ASTCtx, "Local"));
EXPECT_THAT(getReferencedDecls(*Func).Locals,
UnorderedElementsAre(LocalDecl));
}
TEST(ASTOpsTest, LambdaCaptures) {
std::string Code = R"cc(
void func(int CapturedByRef, int CapturedByValue, int NotCaptured) {
int Local;
auto Lambda = [&CapturedByRef, CapturedByValue, &Local](int LambdaParam) {
};
}
)cc";
std::unique_ptr<ASTUnit> Unit =
tooling::buildASTFromCodeWithArgs(Code, {"-fsyntax-only", "-std=c++17"});
auto &ASTCtx = Unit->getASTContext();
ASSERT_EQ(ASTCtx.getDiagnostics().getClient()->getNumErrors(), 0U);
auto *LambdaCallOp = selectFirst<CXXMethodDecl>(
"l", match(cxxMethodDecl(hasName("operator()")).bind("l"), ASTCtx));
ASSERT_NE(LambdaCallOp, nullptr);
auto *Func = cast<FunctionDecl>(findValueDecl(ASTCtx, "func"));
ASSERT_NE(Func, nullptr);
auto *CapturedByRefDecl = Func->getParamDecl(0);
ASSERT_NE(CapturedByRefDecl, nullptr);
auto *CapturedByValueDecl = Func->getParamDecl(1);
ASSERT_NE(CapturedByValueDecl, nullptr);
EXPECT_THAT(getReferencedDecls(*Func).LambdaCapturedParams, IsEmpty());
ReferencedDecls ForLambda = getReferencedDecls(*LambdaCallOp);
EXPECT_THAT(ForLambda.LambdaCapturedParams,
UnorderedElementsAre(CapturedByRefDecl, CapturedByValueDecl));
// Captured locals must be seen in the body for them to appear in
// ReferencedDecls.
EXPECT_THAT(ForLambda.Locals, IsEmpty());
}
} // namespace
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