Export clang-format16 via ydblib project

6e6be3a95868fde888d801b7590af4044049563f

1 files changed, 237 insertions, 0 deletions

diff --git a/contrib/libs/clang16/lib/Driver/Distro.cpp b/contrib/libs/clang16/lib/Driver/Distro.cpp
new file mode 100644
index 0000000000..87a0c5a585
--- /dev/null
+++ b/contrib/libs/clang16/lib/Driver/Distro.cpp
@@ -0,0 +1,237 @@
+//===--- Distro.cpp - Linux distribution detection support ------*- 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 "clang/Driver/Distro.h"
+#include "clang/Basic/LLVM.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Threading.h"
+
+using namespace clang::driver;
+using namespace clang;
+
+static Distro::DistroType DetectOsRelease(llvm::vfs::FileSystem &VFS) {
+  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
+      VFS.getBufferForFile("/etc/os-release");
+  if (!File)
+    File = VFS.getBufferForFile("/usr/lib/os-release");
+  if (!File)
+    return Distro::UnknownDistro;
+
+  SmallVector<StringRef, 16> Lines;
+  File.get()->getBuffer().split(Lines, "\n");
+  Distro::DistroType Version = Distro::UnknownDistro;
+
+  // Obviously this can be improved a lot.
+  for (StringRef Line : Lines)
+    if (Version == Distro::UnknownDistro && Line.startswith("ID="))
+      Version = llvm::StringSwitch<Distro::DistroType>(Line.substr(3))
+                    .Case("alpine", Distro::AlpineLinux)
+                    .Case("fedora", Distro::Fedora)
+                    .Case("gentoo", Distro::Gentoo)
+                    .Case("arch", Distro::ArchLinux)
+                    // On SLES, /etc/os-release was introduced in SLES 11.
+                    .Case("sles", Distro::OpenSUSE)
+                    .Case("opensuse", Distro::OpenSUSE)
+                    .Case("exherbo", Distro::Exherbo)
+                    .Default(Distro::UnknownDistro);
+  return Version;
+}
+
+static Distro::DistroType DetectLsbRelease(llvm::vfs::FileSystem &VFS) {
+  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
+      VFS.getBufferForFile("/etc/lsb-release");
+  if (!File)
+    return Distro::UnknownDistro;
+
+  SmallVector<StringRef, 16> Lines;
+  File.get()->getBuffer().split(Lines, "\n");
+  Distro::DistroType Version = Distro::UnknownDistro;
+
+  for (StringRef Line : Lines)
+    if (Version == Distro::UnknownDistro &&
+        Line.startswith("DISTRIB_CODENAME="))
+      Version = llvm::StringSwitch<Distro::DistroType>(Line.substr(17))
+                    .Case("hardy", Distro::UbuntuHardy)
+                    .Case("intrepid", Distro::UbuntuIntrepid)
+                    .Case("jaunty", Distro::UbuntuJaunty)
+                    .Case("karmic", Distro::UbuntuKarmic)
+                    .Case("lucid", Distro::UbuntuLucid)
+                    .Case("maverick", Distro::UbuntuMaverick)
+                    .Case("natty", Distro::UbuntuNatty)
+                    .Case("oneiric", Distro::UbuntuOneiric)
+                    .Case("precise", Distro::UbuntuPrecise)
+                    .Case("quantal", Distro::UbuntuQuantal)
+                    .Case("raring", Distro::UbuntuRaring)
+                    .Case("saucy", Distro::UbuntuSaucy)
+                    .Case("trusty", Distro::UbuntuTrusty)
+                    .Case("utopic", Distro::UbuntuUtopic)
+                    .Case("vivid", Distro::UbuntuVivid)
+                    .Case("wily", Distro::UbuntuWily)
+                    .Case("xenial", Distro::UbuntuXenial)
+                    .Case("yakkety", Distro::UbuntuYakkety)
+                    .Case("zesty", Distro::UbuntuZesty)
+                    .Case("artful", Distro::UbuntuArtful)
+                    .Case("bionic", Distro::UbuntuBionic)
+                    .Case("cosmic", Distro::UbuntuCosmic)
+                    .Case("disco", Distro::UbuntuDisco)
+                    .Case("eoan", Distro::UbuntuEoan)
+                    .Case("focal", Distro::UbuntuFocal)
+                    .Case("groovy", Distro::UbuntuGroovy)
+                    .Case("hirsute", Distro::UbuntuHirsute)
+                    .Case("impish", Distro::UbuntuImpish)
+                    .Case("jammy", Distro::UbuntuJammy)
+                    .Case("kinetic", Distro::UbuntuKinetic)
+                    .Case("lunar", Distro::UbuntuLunar)
+                    .Default(Distro::UnknownDistro);
+  return Version;
+}
+
+static Distro::DistroType DetectDistro(llvm::vfs::FileSystem &VFS) {
+  Distro::DistroType Version = Distro::UnknownDistro;
+
+  // Newer freedesktop.org's compilant systemd-based systems
+  // should provide /etc/os-release or /usr/lib/os-release.
+  Version = DetectOsRelease(VFS);
+  if (Version != Distro::UnknownDistro)
+    return Version;
+
+  // Older systems might provide /etc/lsb-release.
+  Version = DetectLsbRelease(VFS);
+  if (Version != Distro::UnknownDistro)
+    return Version;
+
+  // Otherwise try some distro-specific quirks for RedHat...
+  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
+      VFS.getBufferForFile("/etc/redhat-release");
+
+  if (File) {
+    StringRef Data = File.get()->getBuffer();
+    if (Data.startswith("Fedora release"))
+      return Distro::Fedora;
+    if (Data.startswith("Red Hat Enterprise Linux") ||
+        Data.startswith("CentOS") || Data.startswith("Scientific Linux")) {
+      if (Data.contains("release 7"))
+        return Distro::RHEL7;
+      else if (Data.contains("release 6"))
+        return Distro::RHEL6;
+      else if (Data.contains("release 5"))
+        return Distro::RHEL5;
+    }
+    return Distro::UnknownDistro;
+  }
+
+  // ...for Debian
+  File = VFS.getBufferForFile("/etc/debian_version");
+  if (File) {
+    StringRef Data = File.get()->getBuffer();
+    // Contents: < major.minor > or < codename/sid >
+    int MajorVersion;
+    if (!Data.split('.').first.getAsInteger(10, MajorVersion)) {
+      switch (MajorVersion) {
+      case 5:
+        return Distro::DebianLenny;
+      case 6:
+        return Distro::DebianSqueeze;
+      case 7:
+        return Distro::DebianWheezy;
+      case 8:
+        return Distro::DebianJessie;
+      case 9:
+        return Distro::DebianStretch;
+      case 10:
+        return Distro::DebianBuster;
+      case 11:
+        return Distro::DebianBullseye;
+      case 12:
+        return Distro::DebianBookworm;
+      case 13:
+        return Distro::DebianTrixie;
+      default:
+        return Distro::UnknownDistro;
+      }
+    }
+    return llvm::StringSwitch<Distro::DistroType>(Data.split("\n").first)
+        .Case("squeeze/sid", Distro::DebianSqueeze)
+        .Case("wheezy/sid", Distro::DebianWheezy)
+        .Case("jessie/sid", Distro::DebianJessie)
+        .Case("stretch/sid", Distro::DebianStretch)
+        .Case("buster/sid", Distro::DebianBuster)
+        .Case("bullseye/sid", Distro::DebianBullseye)
+        .Case("bookworm/sid", Distro::DebianBookworm)
+        .Default(Distro::UnknownDistro);
+  }
+
+  // ...for SUSE
+  File = VFS.getBufferForFile("/etc/SuSE-release");
+  if (File) {
+    StringRef Data = File.get()->getBuffer();
+    SmallVector<StringRef, 8> Lines;
+    Data.split(Lines, "\n");
+    for (const StringRef &Line : Lines) {
+      if (!Line.trim().startswith("VERSION"))
+        continue;
+      std::pair<StringRef, StringRef> SplitLine = Line.split('=');
+      // Old versions have split VERSION and PATCHLEVEL
+      // Newer versions use VERSION = x.y
+      std::pair<StringRef, StringRef> SplitVer =
+          SplitLine.second.trim().split('.');
+      int Version;
+
+      // OpenSUSE/SLES 10 and older are not supported and not compatible
+      // with our rules, so just treat them as Distro::UnknownDistro.
+      if (!SplitVer.first.getAsInteger(10, Version) && Version > 10)
+        return Distro::OpenSUSE;
+      return Distro::UnknownDistro;
+    }
+    return Distro::UnknownDistro;
+  }
+
+  // ...and others.
+  if (VFS.exists("/etc/gentoo-release"))
+    return Distro::Gentoo;
+
+  return Distro::UnknownDistro;
+}
+
+static Distro::DistroType GetDistro(llvm::vfs::FileSystem &VFS,
+                                    const llvm::Triple &TargetOrHost) {
+  // If we don't target Linux, no need to check the distro. This saves a few
+  // OS calls.
+  if (!TargetOrHost.isOSLinux())
+    return Distro::UnknownDistro;
+
+  // True if we're backed by a real file system.
+  const bool onRealFS = (llvm::vfs::getRealFileSystem() == &VFS);
+
+  // If the host is not running Linux, and we're backed by a real file
+  // system, no need to check the distro. This is the case where someone
+  // is cross-compiling from BSD or Windows to Linux, and it would be
+  // meaningless to try to figure out the "distro" of the non-Linux host.
+  llvm::Triple HostTriple(llvm::sys::getProcessTriple());
+  if (!HostTriple.isOSLinux() && onRealFS)
+    return Distro::UnknownDistro;
+
+  if (onRealFS) {
+    // If we're backed by a real file system, perform
+    // the detection only once and save the result.
+    static Distro::DistroType LinuxDistro = DetectDistro(VFS);
+    return LinuxDistro;
+  }
+  // This is mostly for passing tests which uses llvm::vfs::InMemoryFileSystem,
+  // which is not "real".
+  return DetectDistro(VFS);
+}
+
+Distro::Distro(llvm::vfs::FileSystem &VFS, const llvm::Triple &TargetOrHost)
+    : DistroVal(GetDistro(VFS, TargetOrHost)) {}