================ @@ -0,0 +1,141 @@ +//===----------------- PrerequisiteModules.h -------------------------*- +//C++-*-===// +// +// 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 +// +//===----------------------------------------------------------------------===// +// +// Experimental support for C++20 Modules. +// +// Currently we simplify the implementations by preventing reusing module files +// across different versions and different source files. But this is clearly a +// waste of time and space in the end of the day. +// +// FIXME: Supporting reusing module files across different versions and +// different source files. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_PREREQUISITEMODULES_H +#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_PREREQUISITEMODULES_H + +#include "Compiler.h" +#include "GlobalCompilationDatabase.h" +#include "ModuleDependencyScanner.h" +#include "support/Path.h" + +#include "clang/Lex/HeaderSearchOptions.h" + +#include "llvm/ADT/SmallString.h" +#include "llvm/ADT/StringMap.h" + +namespace clang { +namespace clangd { + +/// Build and store all the needed module files information to parse a single +/// source file. e.g., +/// +/// ``` +/// // a.cppm +/// export module a; +/// +/// // b.cppm +/// export module b; +/// import a; +/// +/// // c.cppm +/// export module c; +/// import a; +/// ``` +/// +/// For the source file `c.cppm`, an instance of the class will build and store +/// the module files for `a.cppm` and `b.cppm`. But the module file for `c.cppm` +/// won't be built. Since it is not needed to parse `c.cppm`. +/// +/// All the built module files won't be shared with other instances of the +/// class. So that we can avoid worrying thread safety. +/// +/// A PrerequisiteModules instace should only be initialized by +/// `PrerequisiteModules::buildPrerequisiteModulesFor(...)`. +/// +/// Users can detect whether the PrerequisiteModules is still up to date by +/// calling the `CanReuse()` member function. +/// +/// The users should call `adjustHeaderSearchOptions(...)` or +/// `adjustCompileCommands(CompileCommand&)` member function to update the +/// compilation commands to select the built module files first. +struct PrerequisiteModules { + ~PrerequisiteModules(); + + PrerequisiteModules(const PrerequisiteModules &) = delete; + PrerequisiteModules operator=(const PrerequisiteModules &) = delete; + + PrerequisiteModules(PrerequisiteModules &&Other) ---------------- ChuanqiXu9 wrote:
Done https://github.com/llvm/llvm-project/pull/66462 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
