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.hasValue() +
362                            External.Server.hasValue() + *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
629