da00c60dae
Close https://github.com/llvm/llvm-project/issues/71034 See https://discourse.llvm.org/t/rfc-c-20-modules-introduce-thin-bmi-and-decls-hash/74755 This patch introduces reduced BMI, which doesn't contain the definitions of functions and variables if its definitions won't contribute to the ABI. Testing is a big part of the patch. We want to make sure the reduced BMI contains the same behavior with the existing and relatively stable fatBMI. This is pretty helpful for further reduction. The user interfaces part it left to following patches to ease the reviewing.
141 lines
4.1 KiB
C++
141 lines
4.1 KiB
C++
//===- unittests/Serialization/VarDeclConstantInitTest.cpp - CI tests -----===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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#include "clang/ASTMatchers/ASTMatchers.h"
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#include "clang/Basic/FileManager.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/Frontend/CompilerInvocation.h"
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#include "clang/Frontend/FrontendActions.h"
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#include "clang/Frontend/Utils.h"
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#include "clang/Lex/HeaderSearch.h"
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#include "clang/Tooling/Tooling.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/raw_ostream.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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using namespace clang;
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namespace {
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class VarDeclConstantInitTest : public ::testing::Test {
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void SetUp() override {
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ASSERT_FALSE(sys::fs::createUniqueDirectory("modules-test", TestDir));
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}
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void TearDown() override { sys::fs::remove_directories(TestDir); }
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public:
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SmallString<256> TestDir;
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void addFile(StringRef Path, StringRef Contents) {
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ASSERT_FALSE(sys::path::is_absolute(Path));
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SmallString<256> AbsPath(TestDir);
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sys::path::append(AbsPath, Path);
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ASSERT_FALSE(
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sys::fs::create_directories(llvm::sys::path::parent_path(AbsPath)));
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std::error_code EC;
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llvm::raw_fd_ostream OS(AbsPath, EC);
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ASSERT_FALSE(EC);
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OS << Contents;
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}
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};
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TEST_F(VarDeclConstantInitTest, CachedConstantInit) {
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addFile("Cached.cppm", R"cpp(
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export module Fibonacci.Cache;
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export namespace Fibonacci
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{
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constexpr unsigned long Recursive(unsigned long n)
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{
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if (n == 0)
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return 0;
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if (n == 1)
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return 1;
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return Recursive(n - 2) + Recursive(n - 1);
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}
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template<unsigned long N>
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struct Number{};
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struct DefaultStrategy
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{
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constexpr unsigned long operator()(unsigned long n, auto... other) const
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{
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return (n + ... + other);
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}
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};
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constexpr unsigned long Compute(Number<10ul>, auto strategy)
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{
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return strategy(Recursive(10ul));
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}
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template<unsigned long N, typename Strategy = DefaultStrategy>
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constexpr unsigned long Cache = Compute(Number<N>{}, Strategy{});
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template constexpr unsigned long Cache<10ul>;
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}
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)cpp");
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IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
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CompilerInstance::createDiagnostics(new DiagnosticOptions());
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CreateInvocationOptions CIOpts;
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CIOpts.Diags = Diags;
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CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
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const char *Args[] = {"clang++", "-std=c++20",
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"--precompile", "-working-directory",
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TestDir.c_str(), "Cached.cppm"};
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std::shared_ptr<CompilerInvocation> Invocation =
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createInvocation(Args, CIOpts);
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ASSERT_TRUE(Invocation);
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Invocation->getFrontendOpts().DisableFree = false;
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CompilerInstance Instance;
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Instance.setDiagnostics(Diags.get());
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Instance.setInvocation(Invocation);
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std::string CacheBMIPath = llvm::Twine(TestDir + "/Cached.pcm").str();
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Instance.getFrontendOpts().OutputFile = CacheBMIPath;
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GenerateReducedModuleInterfaceAction Action;
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ASSERT_TRUE(Instance.ExecuteAction(Action));
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ASSERT_FALSE(Diags->hasErrorOccurred());
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std::string DepArg =
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llvm::Twine("-fmodule-file=Fibonacci.Cache=" + CacheBMIPath).str();
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std::unique_ptr<ASTUnit> AST = tooling::buildASTFromCodeWithArgs(
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R"cpp(
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import Fibonacci.Cache;
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)cpp",
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/*Args=*/{"-std=c++20", DepArg.c_str()});
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using namespace clang::ast_matchers;
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ASTContext &Ctx = AST->getASTContext();
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const auto *cached = selectFirst<VarDecl>(
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"Cache",
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match(varDecl(isTemplateInstantiation(), hasName("Cache")).bind("Cache"),
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Ctx));
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EXPECT_TRUE(cached);
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EXPECT_TRUE(cached->getEvaluatedStmt());
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EXPECT_TRUE(cached->getEvaluatedStmt()->WasEvaluated);
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EXPECT_TRUE(cached->getEvaluatedValue());
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EXPECT_TRUE(cached->getEvaluatedValue()->isInt());
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EXPECT_EQ(cached->getEvaluatedValue()->getInt(), 55);
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}
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} // anonymous namespace
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