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//===- unittest/Tooling/CastExprTest.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 "TestVisitor.h"
using namespace clang;
namespace {
struct CastExprVisitor : TestVisitor<CastExprVisitor> {
std::function<void(ExplicitCastExpr *)> OnExplicitCast;
bool VisitExplicitCastExpr(ExplicitCastExpr *Expr) {
if (OnExplicitCast)
OnExplicitCast(Expr);
return true;
}
};
TEST(CastExprTest, GetSubExprAsWrittenThroughMaterializedTemporary) {
CastExprVisitor Visitor;
Visitor.OnExplicitCast = [](ExplicitCastExpr *Expr) {
auto Sub = Expr->getSubExprAsWritten();
EXPECT_TRUE(isa<DeclRefExpr>(Sub))
<< "Expected DeclRefExpr, but saw " << Sub->getStmtClassName();
};
Visitor.runOver("struct S1 {};\n"
"struct S2 { operator S1(); };\n"
"S1 f(S2 s) { return static_cast<S1>(s); }\n");
}
// Verify that getSubExprAsWritten looks through a ConstantExpr in a scenario
// like
//
// CXXFunctionalCastExpr functional cast to struct S <ConstructorConversion>
// `-ConstantExpr 'S'
// |-value: Struct
// `-CXXConstructExpr 'S' 'void (int)'
// `-IntegerLiteral 'int' 0
TEST(CastExprTest, GetSubExprAsWrittenThroughConstantExpr) {
CastExprVisitor Visitor;
Visitor.OnExplicitCast = [](ExplicitCastExpr *Expr) {
auto *Sub = Expr->getSubExprAsWritten();
EXPECT_TRUE(isa<IntegerLiteral>(Sub))
<< "Expected IntegerLiteral, but saw " << Sub->getStmtClassName();
};
Visitor.runOver("struct S { consteval S(int) {} };\n"
"S f() { return S(0); }\n",
CastExprVisitor::Lang_CXX2a);
}
}
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