================ @@ -0,0 +1,339 @@ +//===----------------- ModulesBuilder.cpp ------------------------*- 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 +// +//===----------------------------------------------------------------------===// + +#include "ModulesBuilder.h" +#include "PrerequisiteModules.h" +#include "support/Logger.h" + +#include "clang/Frontend/FrontendAction.h" +#include "clang/Frontend/FrontendActions.h" + +namespace clang { +namespace clangd { + +namespace { + +/// Get or create a path to store module files. Generally it should be: +/// +/// project_root/.cache/clangd/module_files/{RequiredPrefixDir}/. +/// +/// \param MainFile is used to get the root of the project from global +/// compilation database. \param RequiredPrefixDir is used to get the user +/// defined prefix for module files. This is useful when we want to seperate +/// module files. e.g., we want to build module files for the same module unit +/// `a.cppm` with 2 different users `b.cpp` and `c.cpp` and we don't want the +/// module file for `b.cpp` be conflict with the module files for `c.cpp`. Then +/// we can put the 2 module files into different dirs like: +/// +/// project_root/.cache/clangd/module_files/b.cpp/a.pcm +/// project_root/.cache/clangd/module_files/c.cpp/a.pcm +llvm::SmallString<256> getModuleFilesPath(PathRef MainFile, + const GlobalCompilationDatabase &CDB, + StringRef RequiredPrefixDir) { + std::optional<ProjectInfo> PI = CDB.getProjectInfo(MainFile); + if (!PI) + return {}; + + // FIXME: PI->SourceRoot may be empty, depending on the CDB strategy. + llvm::SmallString<256> Result(PI->SourceRoot); + + llvm::sys::path::append(Result, ".cache"); + llvm::sys::path::append(Result, "clangd"); + llvm::sys::path::append(Result, "module_files"); + + llvm::sys::path::append(Result, RequiredPrefixDir); + + llvm::sys::fs::create_directories(Result, /*IgnoreExisting=*/true); + + return Result; +} + +/// Get the absolute path for the filename from the compile command. +llvm::SmallString<128> getAbsolutePath(const tooling::CompileCommand &Cmd) { + llvm::SmallString<128> AbsolutePath; + if (llvm::sys::path::is_absolute(Cmd.Filename)) { + AbsolutePath = Cmd.Filename; + } else { + AbsolutePath = Cmd.Directory; + llvm::sys::path::append(AbsolutePath, Cmd.Filename); + llvm::sys::path::remove_dots(AbsolutePath, true); + } + return AbsolutePath; +} + +/// Get a unique module file path under \param ModuleFilesPrefix. +std::string getUniqueModuleFilePath(StringRef ModuleName, + PathRef ModuleFilesPrefix) { + llvm::SmallString<256> ModuleFilePattern(ModuleFilesPrefix); + auto [PrimaryModuleName, PartitionName] = ModuleName.split(':'); + llvm::sys::path::append(ModuleFilePattern, PrimaryModuleName); + if (!PartitionName.empty()) { + ModuleFilePattern.append("-"); + ModuleFilePattern.append(PartitionName); + } + + ModuleFilePattern.append("-%%-%%-%%-%%-%%-%%"); ---------------- kadircet wrote:
i think we should generate a random prefix for the directory, rather than generating a random pcm name for each individual module under a preamble. in the end we want to achieve uniqueness per-preamble (even if it's for the same file) 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
