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>>
parseDarwinSDKInfo(llvm::vfs::FileSystem & VFS,StringRef SDKRootPath)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