clang-tools-extra/clangd/ConfigCompile.cpp

   1 //===--- ConfigCompile.cpp - Translating Fragments into Config ------------===//
   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 // Fragments are applied to Configs in two steps:
  10 //
  11 // 1. (When the fragment is first loaded)
  12 //    FragmentCompiler::compile() traverses the Fragment and creates
  13 //    function objects that know how to apply the configuration.
  14 // 2. (Every time a config is required)
  15 //    CompiledFragment() executes these functions to populate the Config.
  16 //
  17 // Work could be split between these steps in different ways. We try to
  18 // do as much work as possible in the first step. For example, regexes are
  19 // compiled in stage 1 and captured by the apply function. This is because:
  20 //
  21 //  - it's more efficient, as the work done in stage 1 must only be done once
  22 //  - problems can be reported in stage 1, in stage 2 we must silently recover
  23 //
  24 //===----------------------------------------------------------------------===//
  25
  26 #include "CompileCommands.h"
  27 #include "Config.h"
  28 #include "ConfigFragment.h"
  29 #include "ConfigProvider.h"
  30 #include "Diagnostics.h"
  31 #include "Feature.h"
  32 #include "TidyProvider.h"
  33 #include "support/Logger.h"
  34 #include "support/Path.h"
  35 #include "support/Trace.h"
  36 #include "llvm/ADT/None.h"
  37 #include "llvm/ADT/Optional.h"
  38 #include "llvm/ADT/STLExtras.h"
  39 #include "llvm/ADT/SmallString.h"
  40 #include "llvm/ADT/StringRef.h"
  41 #include "llvm/Support/FileSystem.h"
  42 #include "llvm/Support/FormatVariadic.h"
  43 #include "llvm/Support/Path.h"
  44 #include "llvm/Support/Regex.h"
  45 #include "llvm/Support/SMLoc.h"
  46 #include "llvm/Support/SourceMgr.h"
  47 #include <algorithm>
  48 #include <memory>
  49 #include <string>
  50 #include <vector>
  51
  52 namespace clang {
  53 namespace clangd {
  54 namespace config {
  55 namespace {
  56
  57 // Returns an empty stringref if Path is not under FragmentDir. Returns Path
  58 // as-is when FragmentDir is empty.
  59 llvm::StringRef configRelative(llvm::StringRef Path,
  60                                llvm::StringRef FragmentDir) {
  61   if (FragmentDir.empty())
  62     return Path;
  63   if (!Path.consume_front(FragmentDir))
  64     return llvm::StringRef();
  65   return Path.empty() ? "." : Path;
  66 }
  67
  68 struct CompiledFragmentImpl {
  69   // The independent conditions to check before using settings from this config.
  70   // The following fragment has *two* conditions:
  71   //   If: { Platform: [mac, linux], PathMatch: foo/.* }
  72   // All of them must be satisfied: the platform and path conditions are ANDed.
  73   // The OR logic for the platform condition is implemented inside the function.
  74   std::vector<llvm::unique_function<bool(const Params &) const>> Conditions;
  75   // Mutations that this fragment will apply to the configuration.
  76   // These are invoked only if the conditions are satisfied.
  77   std::vector<llvm::unique_function<void(const Params &, Config &) const>>
  78       Apply;
  79
  80   bool operator()(const Params &P, Config &C) const {
  81     for (const auto &C : Conditions) {
  82       if (!C(P)) {
  83         dlog("Config fragment {0}: condition not met", this);
  84         return false;
  85       }
  86     }
  87     dlog("Config fragment {0}: applying {1} rules", this, Apply.size());
  88     for (const auto &A : Apply)
  89       A(P, C);
  90     return true;
  91   }
  92 };
  93
  94 // Wrapper around condition compile() functions to reduce arg-passing.
  95 struct FragmentCompiler {
  96   FragmentCompiler(CompiledFragmentImpl &Out, DiagnosticCallback D,
  97                    llvm::SourceMgr *SM)
  98       : Out(Out), Diagnostic(D), SourceMgr(SM) {}
  99   CompiledFragmentImpl &Out;
 100   DiagnosticCallback Diagnostic;
 101   llvm::SourceMgr *SourceMgr;
 102   // Normalized Fragment::SourceInfo::Directory.
 103   std::string FragmentDirectory;
 104   bool Trusted = false;
 105
 106   llvm::Optional<llvm::Regex>
 107   compileRegex(const Located<std::string> &Text,
 108                llvm::Regex::RegexFlags Flags = llvm::Regex::NoFlags) {
 109     std::string Anchored = "^(" + *Text + ")$";
 110     llvm::Regex Result(Anchored, Flags);
 111     std::string RegexError;
 112     if (!Result.isValid(RegexError)) {
 113       diag(Error, "Invalid regex " + Anchored + ": " + RegexError, Text.Range);
 114       return llvm::None;
 115     }
 116     return Result;
 117   }
 118
 119   llvm::Optional<std::string> makeAbsolute(Located<std::string> Path,
 120                                            llvm::StringLiteral Description,
 121                                            llvm::sys::path::Style Style) {
 122     if (llvm::sys::path::is_absolute(*Path))
 123       return *Path;
 124     if (FragmentDirectory.empty()) {
 125       diag(Error,
 126            llvm::formatv(
 127                "{0} must be an absolute path, because this fragment is not "
 128                "associated with any directory.",
 129                Description)
 130                .str(),
 131            Path.Range);
 132       return llvm::None;
 133     }
 134     llvm::SmallString<256> AbsPath = llvm::StringRef(*Path);
 135     llvm::sys::fs::make_absolute(FragmentDirectory, AbsPath);
 136     llvm::sys::path::native(AbsPath, Style);
 137     return AbsPath.str().str();
 138   }
 139
 140   // Helper with similar API to StringSwitch, for parsing enum values.
 141   template <typename T> class EnumSwitch {
 142     FragmentCompiler &Outer;
 143     llvm::StringRef EnumName;
 144     const Located<std::string> &Input;
 145     llvm::Optional<T> Result;
 146     llvm::SmallVector<llvm::StringLiteral> ValidValues;
 147
 148   public:
 149     EnumSwitch(llvm::StringRef EnumName, const Located<std::string> &In,
 150                FragmentCompiler &Outer)
 151         : Outer(Outer), EnumName(EnumName), Input(In) {}
 152
 153     EnumSwitch &map(llvm::StringLiteral Name, T Value) {
 154       assert(!llvm::is_contained(ValidValues, Name) && "Duplicate value!");
 155       ValidValues.push_back(Name);
 156       if (!Result && *Input == Name)
 157         Result = Value;
 158       return *this;
 159     }
 160
 161     llvm::Optional<T> value() {
 162       if (!Result)
 163         Outer.diag(
 164             Warning,
 165             llvm::formatv("Invalid {0} value '{1}'. Valid values are {2}.",
 166                           EnumName, *Input, llvm::join(ValidValues, ", "))
 167                 .str(),
 168             Input.Range);
 169       return Result;
 170     };
 171   };
 172
 173   // Attempt to parse a specified string into an enum.
 174   // Yields llvm::None and produces a diagnostic on failure.
 175   //
 176   // Optional<T> Value = compileEnum<En>("Foo", Frag.Foo)
 177   //    .map("Foo", Enum::Foo)
 178   //    .map("Bar", Enum::Bar)
 179   //    .value();
 180   template <typename T>
 181   EnumSwitch<T> compileEnum(llvm::StringRef EnumName,
 182                             const Located<std::string> &In) {
 183     return EnumSwitch<T>(EnumName, In, *this);
 184   }
 185
 186   void compile(Fragment &&F) {
 187     Trusted = F.Source.Trusted;
 188     if (!F.Source.Directory.empty()) {
 189       FragmentDirectory = llvm::sys::path::convert_to_slash(F.Source.Directory);
 190       if (FragmentDirectory.back() != '/')
 191         FragmentDirectory += '/';
 192     }
 193     compile(std::move(F.If));
 194     compile(std::move(F.CompileFlags));
 195     compile(std::move(F.Index));
 196     compile(std::move(F.Diagnostics));
 197     compile(std::move(F.Completion));
 198     compile(std::move(F.Hover));
 199     compile(std::move(F.InlayHints));
 200     compile(std::move(F.Style));
 201   }
 202
 203   void compile(Fragment::IfBlock &&F) {
 204     if (F.HasUnrecognizedCondition)
 205       Out.Conditions.push_back([&](const Params &) { return false; });
 206
 207 #ifdef CLANGD_PATH_CASE_INSENSITIVE
 208     llvm::Regex::RegexFlags Flags = llvm::Regex::IgnoreCase;
 209 #else
 210     llvm::Regex::RegexFlags Flags = llvm::Regex::NoFlags;
 211 #endif
 212
 213     auto PathMatch = std::make_unique<std::vector<llvm::Regex>>();
 214     for (auto &Entry : F.PathMatch) {
 215       if (auto RE = compileRegex(Entry, Flags))
 216         PathMatch->push_back(std::move(*RE));
 217     }
 218     if (!PathMatch->empty()) {
 219       Out.Conditions.push_back(
 220           [PathMatch(std::move(PathMatch)),
 221            FragmentDir(FragmentDirectory)](const Params &P) {
 222             if (P.Path.empty())
 223               return false;
 224             llvm::StringRef Path = configRelative(P.Path, FragmentDir);
 225             // Ignore the file if it is not nested under Fragment.
 226             if (Path.empty())
 227               return false;
 228             return llvm::any_of(*PathMatch, [&](const llvm::Regex &RE) {
 229               return RE.match(Path);
 230             });
 231           });
 232     }
 233
 234     auto PathExclude = std::make_unique<std::vector<llvm::Regex>>();
 235     for (auto &Entry : F.PathExclude) {
 236       if (auto RE = compileRegex(Entry, Flags))
 237         PathExclude->push_back(std::move(*RE));
 238     }
 239     if (!PathExclude->empty()) {
 240       Out.Conditions.push_back(
 241           [PathExclude(std::move(PathExclude)),
 242            FragmentDir(FragmentDirectory)](const Params &P) {
 243             if (P.Path.empty())
 244               return false;
 245             llvm::StringRef Path = configRelative(P.Path, FragmentDir);
 246             // Ignore the file if it is not nested under Fragment.
 247             if (Path.empty())
 248               return true;
 249             return llvm::none_of(*PathExclude, [&](const llvm::Regex &RE) {
 250               return RE.match(Path);
 251             });
 252           });
 253     }
 254   }
 255
 256   void compile(Fragment::CompileFlagsBlock &&F) {
 257     if (F.Compiler)
 258       Out.Apply.push_back(
 259           [Compiler(std::move(**F.Compiler))](const Params &, Config &C) {
 260             C.CompileFlags.Edits.push_back(
 261                 [Compiler](std::vector<std::string> &Args) {
 262                   if (!Args.empty())
 263                     Args.front() = Compiler;
 264                 });
 265           });
 266
 267     if (!F.Remove.empty()) {
 268       auto Remove = std::make_shared<ArgStripper>();
 269       for (auto &A : F.Remove)
 270         Remove->strip(*A);
 271       Out.Apply.push_back([Remove(std::shared_ptr<const ArgStripper>(
 272                               std::move(Remove)))](const Params &, Config &C) {
 273         C.CompileFlags.Edits.push_back(
 274             [Remove](std::vector<std::string> &Args) {
 275               Remove->process(Args);
 276             });
 277       });
 278     }
 279
 280     if (!F.Add.empty()) {
 281       std::vector<std::string> Add;
 282       for (auto &A : F.Add)
 283         Add.push_back(std::move(*A));
 284       Out.Apply.push_back([Add(std::move(Add))](const Params &, Config &C) {
 285         C.CompileFlags.Edits.push_back([Add](std::vector<std::string> &Args) {
 286           // The point to insert at. Just append when `--` isn't present.
 287           auto It = llvm::find(Args, "--");
 288           Args.insert(It, Add.begin(), Add.end());
 289         });
 290       });
 291     }
 292
 293     if (F.CompilationDatabase) {
 294       llvm::Optional<Config::CDBSearchSpec> Spec;
 295       if (**F.CompilationDatabase == "Ancestors") {
 296         Spec.emplace();
 297         Spec->Policy = Config::CDBSearchSpec::Ancestors;
 298       } else if (**F.CompilationDatabase == "None") {
 299         Spec.emplace();
 300         Spec->Policy = Config::CDBSearchSpec::NoCDBSearch;
 301       } else {
 302         if (auto Path =
 303                 makeAbsolute(*F.CompilationDatabase, "CompilationDatabase",
 304                              llvm::sys::path::Style::native)) {
 305           // Drop trailing slash to put the path in canonical form.
 306           // Should makeAbsolute do this?
 307           llvm::StringRef Rel = llvm::sys::path::relative_path(*Path);
 308           if (!Rel.empty() && llvm::sys::path::is_separator(Rel.back()))
 309             Path->pop_back();
 310
 311           Spec.emplace();
 312           Spec->Policy = Config::CDBSearchSpec::FixedDir;
 313           Spec->FixedCDBPath = std::move(Path);
 314         }
 315       }
 316       if (Spec)
 317         Out.Apply.push_back(
 318             [Spec(std::move(*Spec))](const Params &, Config &C) {
 319               C.CompileFlags.CDBSearch = Spec;
 320             });
 321     }
 322   }
 323
 324   void compile(Fragment::IndexBlock &&F) {
 325     if (F.Background) {
 326       if (auto Val = compileEnum<Config::BackgroundPolicy>("Background",
 327                                                            **F.Background)
 328                          .map("Build", Config::BackgroundPolicy::Build)
 329                          .map("Skip", Config::BackgroundPolicy::Skip)
 330                          .value())
 331         Out.Apply.push_back(
 332             [Val](const Params &, Config &C) { C.Index.Background = *Val; });
 333     }
 334     if (F.External)
 335       compile(std::move(**F.External), F.External->Range);
 336     if (F.StandardLibrary)
 337       Out.Apply.push_back(
 338           [Val(**F.StandardLibrary)](const Params &, Config &C) {
 339             C.Index.StandardLibrary = Val;
 340           });
 341   }
 342
 343   void compile(Fragment::IndexBlock::ExternalBlock &&External,
 344                llvm::SMRange BlockRange) {
 345     if (External.Server && !Trusted) {
 346       diag(Error,
 347            "Remote index may not be specified by untrusted configuration. "
 348            "Copy this into user config to use it.",
 349            External.Server->Range);
 350       return;
 351     }
 352 #ifndef CLANGD_ENABLE_REMOTE
 353     if (External.Server) {
 354       elog("Clangd isn't compiled with remote index support, ignoring Server: "
 355            "{0}",
 356            *External.Server);
 357       External.Server.reset();
 358     }
 359 #endif
 360     // Make sure exactly one of the Sources is set.
 361     unsigned SourceCount = External.File.has_value() +
 362                            External.Server.has_value() + *External.IsNone;
 363     if (SourceCount != 1) {
 364       diag(Error, "Exactly one of File, Server or None must be set.",
 365            BlockRange);
 366       return;
 367     }
 368     Config::ExternalIndexSpec Spec;
 369     if (External.Server) {
 370       Spec.Kind = Config::ExternalIndexSpec::Server;
 371       Spec.Location = std::move(**External.Server);
 372     } else if (External.File) {
 373       Spec.Kind = Config::ExternalIndexSpec::File;
 374       auto AbsPath = makeAbsolute(std::move(*External.File), "File",
 375                                   llvm::sys::path::Style::native);
 376       if (!AbsPath)
 377         return;
 378       Spec.Location = std::move(*AbsPath);
 379     } else {
 380       assert(*External.IsNone);
 381       Spec.Kind = Config::ExternalIndexSpec::None;
 382     }
 383     if (Spec.Kind != Config::ExternalIndexSpec::None) {
 384       // Make sure MountPoint is an absolute path with forward slashes.
 385       if (!External.MountPoint)
 386         External.MountPoint.emplace(FragmentDirectory);
 387       if ((**External.MountPoint).empty()) {
 388         diag(Error, "A mountpoint is required.", BlockRange);
 389         return;
 390       }
 391       auto AbsPath = makeAbsolute(std::move(*External.MountPoint), "MountPoint",
 392                                   llvm::sys::path::Style::posix);
 393       if (!AbsPath)
 394         return;
 395       Spec.MountPoint = std::move(*AbsPath);
 396     }
 397     Out.Apply.push_back([Spec(std::move(Spec))](const Params &P, Config &C) {
 398       if (Spec.Kind == Config::ExternalIndexSpec::None) {
 399         C.Index.External = Spec;
 400         return;
 401       }
 402       if (P.Path.empty() || !pathStartsWith(Spec.MountPoint, P.Path,
 403                                             llvm::sys::path::Style::posix))
 404         return;
 405       C.Index.External = Spec;
 406       // Disable background indexing for the files under the mountpoint.
 407       // Note that this will overwrite statements in any previous fragments
 408       // (including the current one).
 409       C.Index.Background = Config::BackgroundPolicy::Skip;
 410     });
 411   }
 412
 413   void compile(Fragment::DiagnosticsBlock &&F) {
 414     std::vector<std::string> Normalized;
 415     for (const auto &Suppressed : F.Suppress) {
 416       if (*Suppressed == "*") {
 417         Out.Apply.push_back([&](const Params &, Config &C) {
 418           C.Diagnostics.SuppressAll = true;
 419           C.Diagnostics.Suppress.clear();
 420         });
 421         return;
 422       }
 423       Normalized.push_back(normalizeSuppressedCode(*Suppressed).str());
 424     }
 425     if (!Normalized.empty())
 426       Out.Apply.push_back(
 427           [Normalized(std::move(Normalized))](const Params &, Config &C) {
 428             if (C.Diagnostics.SuppressAll)
 429               return;
 430             for (llvm::StringRef N : Normalized)
 431               C.Diagnostics.Suppress.insert(N);
 432           });
 433
 434     if (F.UnusedIncludes)
 435       if (auto Val = compileEnum<Config::UnusedIncludesPolicy>(
 436                          "UnusedIncludes", **F.UnusedIncludes)
 437                          .map("Strict", Config::UnusedIncludesPolicy::Strict)
 438                          .map("None", Config::UnusedIncludesPolicy::None)
 439                          .value())
 440         Out.Apply.push_back([Val](const Params &, Config &C) {
 441           C.Diagnostics.UnusedIncludes = *Val;
 442         });
 443     compile(std::move(F.Includes));
 444
 445     compile(std::move(F.ClangTidy));
 446   }
 447
 448   void compile(Fragment::StyleBlock &&F) {
 449     if (!F.FullyQualifiedNamespaces.empty()) {
 450       std::vector<std::string> FullyQualifiedNamespaces;
 451       for (auto &N : F.FullyQualifiedNamespaces) {
 452         // Normalize the data by dropping both leading and trailing ::
 453         StringRef Namespace(*N);
 454         Namespace.consume_front("::");
 455         Namespace.consume_back("::");
 456         FullyQualifiedNamespaces.push_back(Namespace.str());
 457       }
 458       Out.Apply.push_back([FullyQualifiedNamespaces(
 459                               std::move(FullyQualifiedNamespaces))](
 460                               const Params &, Config &C) {
 461         C.Style.FullyQualifiedNamespaces.insert(
 462             C.Style.FullyQualifiedNamespaces.begin(),
 463             FullyQualifiedNamespaces.begin(), FullyQualifiedNamespaces.end());
 464       });
 465     }
 466   }
 467
 468   void appendTidyCheckSpec(std::string &CurSpec,
 469                            const Located<std::string> &Arg, bool IsPositive) {
 470     StringRef Str = StringRef(*Arg).trim();
 471     // Don't support negating here, its handled if the item is in the Add or
 472     // Remove list.
 473     if (Str.startswith("-") || Str.contains(',')) {
 474       diag(Error, "Invalid clang-tidy check name", Arg.Range);
 475       return;
 476     }
 477     if (!Str.contains('*') && !isRegisteredTidyCheck(Str)) {
 478       diag(Warning,
 479            llvm::formatv("clang-tidy check '{0}' was not found", Str).str(),
 480            Arg.Range);
 481       return;
 482     }
 483     CurSpec += ',';
 484     if (!IsPositive)
 485       CurSpec += '-';
 486     CurSpec += Str;
 487   }
 488
 489   void compile(Fragment::DiagnosticsBlock::ClangTidyBlock &&F) {
 490     std::string Checks;
 491     for (auto &CheckGlob : F.Add)
 492       appendTidyCheckSpec(Checks, CheckGlob, true);
 493
 494     for (auto &CheckGlob : F.Remove)
 495       appendTidyCheckSpec(Checks, CheckGlob, false);
 496
 497     if (!Checks.empty())
 498       Out.Apply.push_back(
 499           [Checks = std::move(Checks)](const Params &, Config &C) {
 500             C.Diagnostics.ClangTidy.Checks.append(
 501                 Checks,
 502                 C.Diagnostics.ClangTidy.Checks.empty() ? /*skip comma*/ 1 : 0,
 503                 std::string::npos);
 504           });
 505     if (!F.CheckOptions.empty()) {
 506       std::vector<std::pair<std::string, std::string>> CheckOptions;
 507       for (auto &Opt : F.CheckOptions)
 508         CheckOptions.emplace_back(std::move(*Opt.first),
 509                                   std::move(*Opt.second));
 510       Out.Apply.push_back(
 511           [CheckOptions = std::move(CheckOptions)](const Params &, Config &C) {
 512             for (auto &StringPair : CheckOptions)
 513               C.Diagnostics.ClangTidy.CheckOptions.insert_or_assign(
 514                   StringPair.first, StringPair.second);
 515           });
 516     }
 517   }
 518
 519   void compile(Fragment::DiagnosticsBlock::IncludesBlock &&F) {
 520 #ifdef CLANGD_PATH_CASE_INSENSITIVE
 521     static llvm::Regex::RegexFlags Flags = llvm::Regex::IgnoreCase;
 522 #else
 523     static llvm::Regex::RegexFlags Flags = llvm::Regex::NoFlags;
 524 #endif
 525     auto Filters = std::make_shared<std::vector<llvm::Regex>>();
 526     for (auto &HeaderPattern : F.IgnoreHeader) {
 527       // Anchor on the right.
 528       std::string AnchoredPattern = "(" + *HeaderPattern + ")$";
 529       llvm::Regex CompiledRegex(AnchoredPattern, Flags);
 530       std::string RegexError;
 531       if (!CompiledRegex.isValid(RegexError)) {
 532         diag(Warning,
 533              llvm::formatv("Invalid regular expression '{0}': {1}",
 534                            *HeaderPattern, RegexError)
 535                  .str(),
 536              HeaderPattern.Range);
 537         continue;
 538       }
 539       Filters->push_back(std::move(CompiledRegex));
 540     }
 541     if (Filters->empty())
 542       return;
 543     auto Filter = [Filters](llvm::StringRef Path) {
 544       for (auto &Regex : *Filters)
 545         if (Regex.match(Path))
 546           return true;
 547       return false;
 548     };
 549     Out.Apply.push_back([Filter](const Params &, Config &C) {
 550       C.Diagnostics.Includes.IgnoreHeader.emplace_back(Filter);
 551     });
 552   }
 553
 554   void compile(Fragment::CompletionBlock &&F) {
 555     if (F.AllScopes) {
 556       Out.Apply.push_back(
 557           [AllScopes(**F.AllScopes)](const Params &, Config &C) {
 558             C.Completion.AllScopes = AllScopes;
 559           });
 560     }
 561   }
 562
 563   void compile(Fragment::HoverBlock &&F) {
 564     if (F.ShowAKA) {
 565       Out.Apply.push_back([ShowAKA(**F.ShowAKA)](const Params &, Config &C) {
 566         C.Hover.ShowAKA = ShowAKA;
 567       });
 568     }
 569   }
 570
 571   void compile(Fragment::InlayHintsBlock &&F) {
 572     if (F.Enabled)
 573       Out.Apply.push_back([Value(**F.Enabled)](const Params &, Config &C) {
 574         C.InlayHints.Enabled = Value;
 575       });
 576     if (F.ParameterNames)
 577       Out.Apply.push_back(
 578           [Value(**F.ParameterNames)](const Params &, Config &C) {
 579             C.InlayHints.Parameters = Value;
 580           });
 581     if (F.DeducedTypes)
 582       Out.Apply.push_back([Value(**F.DeducedTypes)](const Params &, Config &C) {
 583         C.InlayHints.DeducedTypes = Value;
 584       });
 585     if (F.Designators)
 586       Out.Apply.push_back([Value(**F.Designators)](const Params &, Config &C) {
 587         C.InlayHints.Designators = Value;
 588       });
 589   }
 590
 591   constexpr static llvm::SourceMgr::DiagKind Error = llvm::SourceMgr::DK_Error;
 592   constexpr static llvm::SourceMgr::DiagKind Warning =
 593       llvm::SourceMgr::DK_Warning;
 594   void diag(llvm::SourceMgr::DiagKind Kind, llvm::StringRef Message,
 595             llvm::SMRange Range) {
 596     if (Range.isValid() && SourceMgr != nullptr)
 597       Diagnostic(SourceMgr->GetMessage(Range.Start, Kind, Message, Range));
 598     else
 599       Diagnostic(llvm::SMDiagnostic("", Kind, Message));
 600   }
 601 };
 602
 603 } // namespace
 604
 605 CompiledFragment Fragment::compile(DiagnosticCallback D) && {
 606   llvm::StringRef ConfigFile = "<unknown>";
 607   std::pair<unsigned, unsigned> LineCol = {0, 0};
 608   if (auto *SM = Source.Manager.get()) {
 609     unsigned BufID = SM->getMainFileID();
 610     LineCol = SM->getLineAndColumn(Source.Location, BufID);
 611     ConfigFile = SM->getBufferInfo(BufID).Buffer->getBufferIdentifier();
 612   }
 613   trace::Span Tracer("ConfigCompile");
 614   SPAN_ATTACH(Tracer, "ConfigFile", ConfigFile);
 615   auto Result = std::make_shared<CompiledFragmentImpl>();
 616   vlog("Config fragment: compiling {0}:{1} -> {2} (trusted={3})", ConfigFile,
 617        LineCol.first, Result.get(), Source.Trusted);
 618
 619   FragmentCompiler{*Result, D, Source.Manager.get()}.compile(std::move(*this));
 620   // Return as cheaply-copyable wrapper.
 621   return [Result(std::move(Result))](const Params &P, Config &C) {
 622     return (*Result)(P, C);
 623   };
 624 }
 625
 626 } // namespace config
 627 } // namespace clangd
 628 } // namespace clang