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/Basic/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#include <optional>
15
16using namespace clang;
17
18std::optional<VersionTuple> DarwinSDKInfo::RelatedTargetVersionMapping::map(
19 const VersionTuple &Key, const VersionTuple &MinimumValue,
20 std::optional<VersionTuple> MaximumValue) const {
21 if (Key < MinimumKeyVersion)
22 return MinimumValue;
23 if (Key > MaximumKeyVersion)
24 return MaximumValue;
25 auto KV = Mapping.find(Val: Key.normalize());
26 if (KV != Mapping.end())
27 return KV->getSecond();
28 // If no exact entry found, try just the major key version. Only do so when
29 // a minor version number is present, to avoid recursing indefinitely into
30 // the major-only check.
31 if (Key.getMinor())
32 return map(Key: VersionTuple(Key.getMajor()), MinimumValue, MaximumValue);
33 // If this a major only key, return std::nullopt for a missing entry.
34 return std::nullopt;
35}
36
37std::optional<DarwinSDKInfo::RelatedTargetVersionMapping>
38DarwinSDKInfo::RelatedTargetVersionMapping::parseJSON(
39 const llvm::json::Object &Obj, VersionTuple MaximumDeploymentTarget) {
40 VersionTuple Min = VersionTuple(std::numeric_limits<unsigned>::max());
41 VersionTuple Max = VersionTuple(0);
42 VersionTuple MinValue = Min;
43 llvm::DenseMap<VersionTuple, VersionTuple> Mapping;
44 for (const auto &KV : Obj) {
45 if (auto Val = KV.getSecond().getAsString()) {
46 llvm::VersionTuple KeyVersion;
47 llvm::VersionTuple ValueVersion;
48 if (KeyVersion.tryParse(string: KV.getFirst()) || ValueVersion.tryParse(string: *Val))
49 return std::nullopt;
50 Mapping[KeyVersion.normalize()] = ValueVersion;
51 if (KeyVersion < Min)
52 Min = KeyVersion;
53 if (KeyVersion > Max)
54 Max = KeyVersion;
55 if (ValueVersion < MinValue)
56 MinValue = ValueVersion;
57 }
58 }
59 if (Mapping.empty())
60 return std::nullopt;
61 return RelatedTargetVersionMapping(
62 Min, Max, MinValue, MaximumDeploymentTarget, std::move(Mapping));
63}
64
65static std::optional<VersionTuple> getVersionKey(const llvm::json::Object &Obj,
66 StringRef Key) {
67 auto Value = Obj.getString(K: Key);
68 if (!Value)
69 return std::nullopt;
70 VersionTuple Version;
71 if (Version.tryParse(string: *Value))
72 return std::nullopt;
73 return Version;
74}
75
76std::optional<DarwinSDKInfo>
77DarwinSDKInfo::parseDarwinSDKSettingsJSON(const llvm::json::Object *Obj) {
78 auto Version = getVersionKey(Obj: *Obj, Key: "Version");
79 if (!Version)
80 return std::nullopt;
81 auto MaximumDeploymentVersion =
82 getVersionKey(Obj: *Obj, Key: "MaximumDeploymentTarget");
83 if (!MaximumDeploymentVersion)
84 return std::nullopt;
85 llvm::DenseMap<OSEnvPair::StorageType,
86 std::optional<RelatedTargetVersionMapping>>
87 VersionMappings;
88 if (const auto *VM = Obj->getObject(K: "VersionMap")) {
89 // FIXME: Generalize this out beyond iOS-deriving targets.
90 // Look for ios_<targetos> version mapping for targets that derive from ios.
91 for (const auto &KV : *VM) {
92 auto Pair = StringRef(KV.getFirst()).split(Separator: "_");
93 if (Pair.first.compare_insensitive(RHS: "ios") == 0) {
94 llvm::Triple TT(llvm::Twine("--") + Pair.second.lower());
95 if (TT.getOS() != llvm::Triple::UnknownOS) {
96 auto Mapping = RelatedTargetVersionMapping::parseJSON(
97 Obj: *KV.getSecond().getAsObject(), MaximumDeploymentTarget: *MaximumDeploymentVersion);
98 if (Mapping)
99 VersionMappings[OSEnvPair(llvm::Triple::IOS,
100 llvm::Triple::UnknownEnvironment,
101 TT.getOS(),
102 llvm::Triple::UnknownEnvironment)
103 .Value] = std::move(Mapping);
104 }
105 }
106 }
107
108 if (const auto *Mapping = VM->getObject(K: "macOS_iOSMac")) {
109 auto VersionMap = RelatedTargetVersionMapping::parseJSON(
110 Obj: *Mapping, MaximumDeploymentTarget: *MaximumDeploymentVersion);
111 if (!VersionMap)
112 return std::nullopt;
113 VersionMappings[OSEnvPair::macOStoMacCatalystPair().Value] =
114 std::move(VersionMap);
115 }
116 if (const auto *Mapping = VM->getObject(K: "iOSMac_macOS")) {
117 auto VersionMap = RelatedTargetVersionMapping::parseJSON(
118 Obj: *Mapping, MaximumDeploymentTarget: *MaximumDeploymentVersion);
119 if (!VersionMap)
120 return std::nullopt;
121 VersionMappings[OSEnvPair::macCatalystToMacOSPair().Value] =
122 std::move(VersionMap);
123 }
124 }
125
126 return DarwinSDKInfo(std::move(*Version),
127 std::move(*MaximumDeploymentVersion),
128 std::move(VersionMappings));
129}
130
131Expected<std::optional<DarwinSDKInfo>>
132clang::parseDarwinSDKInfo(llvm::vfs::FileSystem &VFS, StringRef SDKRootPath) {
133 llvm::SmallString<256> Filepath = SDKRootPath;
134 llvm::sys::path::append(path&: Filepath, a: "SDKSettings.json");
135 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
136 VFS.getBufferForFile(Name: Filepath);
137 if (!File) {
138 // If the file couldn't be read, assume it just doesn't exist.
139 return std::nullopt;
140 }
141 Expected<llvm::json::Value> Result =
142 llvm::json::parse(JSON: File.get()->getBuffer());
143 if (!Result)
144 return Result.takeError();
145
146 if (const auto *Obj = Result->getAsObject()) {
147 if (auto SDKInfo = DarwinSDKInfo::parseDarwinSDKSettingsJSON(Obj))
148 return std::move(SDKInfo);
149 }
150 return llvm::make_error<llvm::StringError>(Args: "invalid SDKSettings.json",
151 Args: llvm::inconvertibleErrorCode());
152}
153