================ @@ -0,0 +1,106 @@ +//===-------------- ModuleDependencyScanner.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 +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_MODULEDEPENDENCYSCANNER_H +#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_MODULEDEPENDENCYSCANNER_H + +#include "GlobalCompilationDatabase.h" +#include "support/Path.h" +#include "support/ThreadsafeFS.h" + +#include "clang/Tooling/DependencyScanning/DependencyScanningService.h" +#include "clang/Tooling/DependencyScanning/DependencyScanningTool.h" + +#include "llvm/ADT/SmallString.h" +#include "llvm/ADT/StringMap.h" + +namespace clang { +namespace clangd { + +/// A scanner to query the dependency information for C++20 Modules. +/// +/// The scanner can scan a single file with `scan(PathRef)` member function +/// or scan the whole project with `globalScan(PathRef)` member function. See +/// the comments of `globalScan` to see the details. +/// +/// ModuleDependencyScanner should only be used via ScanningAllProjectModules. +/// +/// The ModuleDependencyScanner can get the directly required module name for a +/// specific source file. Also the ModuleDependencyScanner can get the source +/// file declaring a specific module name. +/// +/// IMPORTANT NOTE: we assume that every module unit is only declared once in a +/// source file in the project. But the assumption is not strictly true even +/// besides the invalid projects. The language specification requires that every +/// module unit should be unique in a valid program. But a project can contain +/// multiple programs. Then it is valid that we can have multiple source files +/// declaring the same module in a project as long as these source files don't +/// interere with each other.` +class ModuleDependencyScanner { +public: + ModuleDependencyScanner(const GlobalCompilationDatabase &CDB, + const ThreadsafeFS &TFS) + : CDB(CDB), TFS(TFS), + Service(tooling::dependencies::ScanningMode::CanonicalPreprocessing, + tooling::dependencies::ScanningOutputFormat::P1689) {} + + // The scanned modules dependency information for a specific source file. ---------------- kadircet wrote:
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