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//===- unittests/AST/ASTExprTest.cpp --- AST Expr tests -------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file contains tests for AST Expr related methods.
//
//===----------------------------------------------------------------------===//
#include "ASTPrint.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Expr.h"
#include "clang/AST/IgnoreExpr.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Tooling/Tooling.h"
#include "gtest/gtest.h"
using namespace clang;
using clang::ast_matchers::cxxRecordDecl;
using clang::ast_matchers::hasName;
using clang::ast_matchers::match;
using clang::ast_matchers::varDecl;
using clang::tooling::buildASTFromCode;
static IntegerLiteral *createIntLiteral(ASTContext &Ctx, uint32_t Value) {
const int numBits = 32;
return IntegerLiteral::Create(Ctx, llvm::APInt(numBits, Value), Ctx.IntTy,
{});
}
const CXXRecordDecl *getCXXRecordDeclNode(ASTUnit *AST,
const std::string &Name) {
auto Result =
match(cxxRecordDecl(hasName(Name)).bind("record"), AST->getASTContext());
EXPECT_FALSE(Result.empty());
return Result[0].getNodeAs<CXXRecordDecl>("record");
}
const VarDecl *getVariableNode(ASTUnit *AST, const std::string &Name) {
auto Result = match(varDecl(hasName(Name)).bind("var"), AST->getASTContext());
EXPECT_EQ(Result.size(), 1u);
return Result[0].getNodeAs<VarDecl>("var");
}
TEST(ASTExpr, IgnoreExprCallbackForwarded) {
constexpr char Code[] = "";
auto AST = tooling::buildASTFromCodeWithArgs(Code, /*Args=*/{"-std=c++20"});
ASTContext &Ctx = AST->getASTContext();
struct IgnoreParens {
Expr *operator()(Expr *E) & { return nullptr; }
Expr *operator()(Expr *E) && {
if (auto *PE = dyn_cast<ParenExpr>(E)) {
return PE->getSubExpr();
}
return E;
}
};
{
auto *IntExpr = createIntLiteral(Ctx, 10);
ParenExpr *PE =
new (Ctx) ParenExpr(SourceLocation{}, SourceLocation{}, IntExpr);
EXPECT_EQ(IntExpr, IgnoreExprNodes(PE, IgnoreParens{}));
}
{
IgnoreParens CB{};
auto *IntExpr = createIntLiteral(Ctx, 10);
ParenExpr *PE =
new (Ctx) ParenExpr(SourceLocation{}, SourceLocation{}, IntExpr);
EXPECT_EQ(nullptr, IgnoreExprNodes(PE, CB));
}
}
TEST(ASTExpr, InitListIsConstantInitialized) {
auto AST = buildASTFromCode(R"cpp(
struct Empty {};
struct Foo : Empty { int x, y; };
int gv;
)cpp");
ASTContext &Ctx = AST->getASTContext();
const CXXRecordDecl *Empty = getCXXRecordDeclNode(AST.get(), "Empty");
const CXXRecordDecl *Foo = getCXXRecordDeclNode(AST.get(), "Foo");
SourceLocation Loc{};
InitListExpr *BaseInit = new (Ctx) InitListExpr(Ctx, Loc, {}, Loc);
BaseInit->setType(Ctx.getRecordType(Empty));
Expr *Exprs[3] = {
BaseInit,
createIntLiteral(Ctx, 13),
createIntLiteral(Ctx, 42),
};
InitListExpr *FooInit = new (Ctx) InitListExpr(Ctx, Loc, Exprs, Loc);
FooInit->setType(Ctx.getRecordType(Foo));
EXPECT_TRUE(FooInit->isConstantInitializer(Ctx, false));
// Replace the last initializer with something non-constant and make sure
// this returns false. Previously we had a bug where we didn't count base
// initializers, and only iterated over fields.
const VarDecl *GV = getVariableNode(AST.get(), "gv");
auto *Ref = new (Ctx) DeclRefExpr(Ctx, const_cast<VarDecl *>(GV), false,
Ctx.IntTy, VK_LValue, Loc);
(void)FooInit->updateInit(Ctx, 2, Ref);
EXPECT_FALSE(FooInit->isConstantInitializer(Ctx, false));
}
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