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//===--- DarwinSDKInfo.cpp - SDK Information parser for darwin - ----------===//
//
// 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 "clang/Basic/DarwinSDKInfo.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/JSON.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include <optional>
using namespace clang;
std::optional<VersionTuple> DarwinSDKInfo::RelatedTargetVersionMapping::map(
const VersionTuple &Key, const VersionTuple &MinimumValue,
std::optional<VersionTuple> MaximumValue) const {
if (Key < MinimumKeyVersion)
return MinimumValue;
if (Key > MaximumKeyVersion)
return MaximumValue;
auto KV = Mapping.find(Key.normalize());
if (KV != Mapping.end())
return KV->getSecond();
// If no exact entry found, try just the major key version. Only do so when
// a minor version number is present, to avoid recursing indefinitely into
// the major-only check.
if (Key.getMinor())
return map(VersionTuple(Key.getMajor()), MinimumValue, MaximumValue);
// If this a major only key, return std::nullopt for a missing entry.
return std::nullopt;
}
std::optional<DarwinSDKInfo::RelatedTargetVersionMapping>
DarwinSDKInfo::RelatedTargetVersionMapping::parseJSON(
const llvm::json::Object &Obj, VersionTuple MaximumDeploymentTarget) {
VersionTuple Min = VersionTuple(std::numeric_limits<unsigned>::max());
VersionTuple Max = VersionTuple(0);
VersionTuple MinValue = Min;
llvm::DenseMap<VersionTuple, VersionTuple> Mapping;
for (const auto &KV : Obj) {
if (auto Val = KV.getSecond().getAsString()) {
llvm::VersionTuple KeyVersion;
llvm::VersionTuple ValueVersion;
if (KeyVersion.tryParse(KV.getFirst()) || ValueVersion.tryParse(*Val))
return std::nullopt;
Mapping[KeyVersion.normalize()] = ValueVersion;
if (KeyVersion < Min)
Min = KeyVersion;
if (KeyVersion > Max)
Max = KeyVersion;
if (ValueVersion < MinValue)
MinValue = ValueVersion;
}
}
if (Mapping.empty())
return std::nullopt;
return RelatedTargetVersionMapping(
Min, Max, MinValue, MaximumDeploymentTarget, std::move(Mapping));
}
static std::optional<VersionTuple> getVersionKey(const llvm::json::Object &Obj,
StringRef Key) {
auto Value = Obj.getString(Key);
if (!Value)
return std::nullopt;
VersionTuple Version;
if (Version.tryParse(*Value))
return std::nullopt;
return Version;
}
std::optional<DarwinSDKInfo>
DarwinSDKInfo::parseDarwinSDKSettingsJSON(const llvm::json::Object *Obj) {
auto Version = getVersionKey(*Obj, "Version");
if (!Version)
return std::nullopt;
auto MaximumDeploymentVersion =
getVersionKey(*Obj, "MaximumDeploymentTarget");
if (!MaximumDeploymentVersion)
return std::nullopt;
llvm::DenseMap<OSEnvPair::StorageType,
std::optional<RelatedTargetVersionMapping>>
VersionMappings;
if (const auto *VM = Obj->getObject("VersionMap")) {
// FIXME: Generalize this out beyond iOS-deriving targets.
// Look for ios_<targetos> version mapping for targets that derive from ios.
for (const auto &KV : *VM) {
auto Pair = StringRef(KV.getFirst()).split("_");
if (Pair.first.compare_insensitive("ios") == 0) {
llvm::Triple TT(llvm::Twine("--") + Pair.second.lower());
if (TT.getOS() != llvm::Triple::UnknownOS) {
auto Mapping = RelatedTargetVersionMapping::parseJSON(
*KV.getSecond().getAsObject(), *MaximumDeploymentVersion);
if (Mapping)
VersionMappings[OSEnvPair(llvm::Triple::IOS,
llvm::Triple::UnknownEnvironment,
TT.getOS(),
llvm::Triple::UnknownEnvironment)
.Value] = std::move(Mapping);
}
}
}
if (const auto *Mapping = VM->getObject("macOS_iOSMac")) {
auto VersionMap = RelatedTargetVersionMapping::parseJSON(
*Mapping, *MaximumDeploymentVersion);
if (!VersionMap)
return std::nullopt;
VersionMappings[OSEnvPair::macOStoMacCatalystPair().Value] =
std::move(VersionMap);
}
if (const auto *Mapping = VM->getObject("iOSMac_macOS")) {
auto VersionMap = RelatedTargetVersionMapping::parseJSON(
*Mapping, *MaximumDeploymentVersion);
if (!VersionMap)
return std::nullopt;
VersionMappings[OSEnvPair::macCatalystToMacOSPair().Value] =
std::move(VersionMap);
}
}
return DarwinSDKInfo(std::move(*Version),
std::move(*MaximumDeploymentVersion),
std::move(VersionMappings));
}
Expected<std::optional<DarwinSDKInfo>>
clang::parseDarwinSDKInfo(llvm::vfs::FileSystem &VFS, StringRef SDKRootPath) {
llvm::SmallString<256> Filepath = SDKRootPath;
llvm::sys::path::append(Filepath, "SDKSettings.json");
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
VFS.getBufferForFile(Filepath);
if (!File) {
// If the file couldn't be read, assume it just doesn't exist.
return std::nullopt;
}
Expected<llvm::json::Value> Result =
llvm::json::parse(File.get()->getBuffer());
if (!Result)
return Result.takeError();
if (const auto *Obj = Result->getAsObject()) {
if (auto SDKInfo = DarwinSDKInfo::parseDarwinSDKSettingsJSON(Obj))
return std::move(SDKInfo);
}
return llvm::make_error<llvm::StringError>("invalid SDKSettings.json",
llvm::inconvertibleErrorCode());
}
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