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      1 //===--- DarwinSDKInfo.cpp - SDK Information parser for darwin - ----------===//
      2 //
      3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
      4 // See https://llvm.org/LICENSE.txt for license information.
      5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
      6 //
      7 //===----------------------------------------------------------------------===//
      8 
      9 #include "clang/Driver/DarwinSDKInfo.h"
     10 #include "llvm/Support/ErrorOr.h"
     11 #include "llvm/Support/JSON.h"
     12 #include "llvm/Support/MemoryBuffer.h"
     13 #include "llvm/Support/Path.h"
     14 
     15 using namespace clang::driver;
     16 using namespace clang;
     17 
     18 Expected<Optional<DarwinSDKInfo>>
     19 driver::parseDarwinSDKInfo(llvm::vfs::FileSystem &VFS, StringRef SDKRootPath) {
     20   llvm::SmallString<256> Filepath = SDKRootPath;
     21   llvm::sys::path::append(Filepath, "SDKSettings.json");
     22   llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
     23       VFS.getBufferForFile(Filepath);
     24   if (!File) {
     25     // If the file couldn't be read, assume it just doesn't exist.
     26     return None;
     27   }
     28   Expected<llvm::json::Value> Result =
     29       llvm::json::parse(File.get()->getBuffer());
     30   if (!Result)
     31     return Result.takeError();
     32 
     33   if (const auto *Obj = Result->getAsObject()) {
     34     auto VersionString = Obj->getString("Version");
     35     if (VersionString) {
     36       VersionTuple Version;
     37       if (!Version.tryParse(*VersionString))
     38         return DarwinSDKInfo(Version);
     39     }
     40   }
     41   return llvm::make_error<llvm::StringError>("invalid SDKSettings.json",
     42                                              llvm::inconvertibleErrorCode());
     43 }
     44