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//===- unittests/Serialization/VarDeclConstantInitTest.cpp - CI 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
//
//===----------------------------------------------------------------------===//
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/Basic/FileManager.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/CompilerInvocation.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Frontend/Utils.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Tooling/Tooling.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/raw_ostream.h"
#include "gtest/gtest.h"
using namespace llvm;
using namespace clang;
namespace {
class VarDeclConstantInitTest : public ::testing::Test {
void SetUp() override {
ASSERT_FALSE(sys::fs::createUniqueDirectory("modules-test", TestDir));
}
void TearDown() override { sys::fs::remove_directories(TestDir); }
public:
SmallString<256> TestDir;
void addFile(StringRef Path, StringRef Contents) {
ASSERT_FALSE(sys::path::is_absolute(Path));
SmallString<256> AbsPath(TestDir);
sys::path::append(AbsPath, Path);
ASSERT_FALSE(
sys::fs::create_directories(llvm::sys::path::parent_path(AbsPath)));
std::error_code EC;
llvm::raw_fd_ostream OS(AbsPath, EC);
ASSERT_FALSE(EC);
OS << Contents;
}
};
TEST_F(VarDeclConstantInitTest, CachedConstantInit) {
addFile("Cached.cppm", R"cpp(
export module Fibonacci.Cache;
export namespace Fibonacci
{
constexpr unsigned long Recursive(unsigned long n)
{
if (n == 0)
return 0;
if (n == 1)
return 1;
return Recursive(n - 2) + Recursive(n - 1);
}
template<unsigned long N>
struct Number{};
struct DefaultStrategy
{
constexpr unsigned long operator()(unsigned long n, auto... other) const
{
return (n + ... + other);
}
};
constexpr unsigned long Compute(Number<10ul>, auto strategy)
{
return strategy(Recursive(10ul));
}
template<unsigned long N, typename Strategy = DefaultStrategy>
constexpr unsigned long Cache = Compute(Number<N>{}, Strategy{});
template constexpr unsigned long Cache<10ul>;
}
)cpp");
CreateInvocationOptions CIOpts;
CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
DiagnosticOptions DiagOpts;
IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
CompilerInstance::createDiagnostics(*CIOpts.VFS, DiagOpts);
CIOpts.Diags = Diags;
const char *Args[] = {"clang++", "-std=c++20",
"--precompile", "-working-directory",
TestDir.c_str(), "Cached.cppm"};
std::shared_ptr<CompilerInvocation> Invocation =
createInvocation(Args, CIOpts);
ASSERT_TRUE(Invocation);
Invocation->getFrontendOpts().DisableFree = false;
CompilerInstance Instance(std::move(Invocation));
Instance.setDiagnostics(Diags.get());
std::string CacheBMIPath = llvm::Twine(TestDir + "/Cached.pcm").str();
Instance.getFrontendOpts().OutputFile = CacheBMIPath;
GenerateReducedModuleInterfaceAction Action;
ASSERT_TRUE(Instance.ExecuteAction(Action));
ASSERT_FALSE(Diags->hasErrorOccurred());
std::string DepArg =
llvm::Twine("-fmodule-file=Fibonacci.Cache=" + CacheBMIPath).str();
std::unique_ptr<ASTUnit> AST = tooling::buildASTFromCodeWithArgs(
R"cpp(
import Fibonacci.Cache;
)cpp",
/*Args=*/{"-std=c++20", DepArg.c_str()});
using namespace clang::ast_matchers;
ASTContext &Ctx = AST->getASTContext();
const auto *cached = selectFirst<VarDecl>(
"Cache",
match(varDecl(isTemplateInstantiation(), hasName("Cache")).bind("Cache"),
Ctx));
EXPECT_TRUE(cached);
EXPECT_TRUE(cached->getEvaluatedStmt());
EXPECT_TRUE(cached->getEvaluatedStmt()->WasEvaluated);
EXPECT_TRUE(cached->getEvaluatedValue());
EXPECT_TRUE(cached->getEvaluatedValue()->isInt());
EXPECT_EQ(cached->getEvaluatedValue()->getInt(), 55);
}
} // anonymous namespace
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