clang-tools  11.0.0
Index.h
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1 //===--- Index.h -------------------------------------------------*- C++-*-===//
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 #ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_INDEX_H
10 #define LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_INDEX_H
11 
12 #include "Ref.h"
13 #include "Relation.h"
14 #include "Symbol.h"
15 #include "SymbolID.h"
16 #include "llvm/ADT/DenseSet.h"
17 #include "llvm/ADT/Optional.h"
18 #include "llvm/ADT/StringExtras.h"
19 #include "llvm/Support/JSON.h"
20 #include <mutex>
21 #include <string>
22 
23 namespace clang {
24 namespace clangd {
25 
27  /// A query string for the fuzzy find. This is matched against symbols'
28  /// un-qualified identifiers and should not contain qualifiers like "::".
29  std::string Query;
30  /// If this is non-empty, symbols must be in at least one of the scopes
31  /// (e.g. namespaces) excluding nested scopes. For example, if a scope "xyz::"
32  /// is provided, the matched symbols must be defined in namespace xyz but not
33  /// namespace xyz::abc.
34  ///
35  /// The global scope is "", a top level scope is "foo::", etc.
36  std::vector<std::string> Scopes;
37  /// If set to true, allow symbols from any scope. Scopes explicitly listed
38  /// above will be ranked higher.
39  bool AnyScope = false;
40  /// The number of top candidates to return. The index may choose to
41  /// return more than this, e.g. if it doesn't know which candidates are best.
42  llvm::Optional<uint32_t> Limit;
43  /// If set to true, only symbols for completion support will be considered.
45  /// Contextually relevant files (e.g. the file we're code-completing in).
46  /// Paths should be absolute.
47  std::vector<std::string> ProximityPaths;
48  /// Preferred types of symbols. These are raw representation of `OpaqueType`.
49  std::vector<std::string> PreferredTypes;
50 
51  bool operator==(const FuzzyFindRequest &Req) const {
52  return std::tie(Query, Scopes, Limit, RestrictForCodeCompletion,
54  std::tie(Req.Query, Req.Scopes, Req.Limit,
56  Req.PreferredTypes);
57  }
58  bool operator!=(const FuzzyFindRequest &Req) const { return !(*this == Req); }
59 };
60 bool fromJSON(const llvm::json::Value &Value, FuzzyFindRequest &Request);
61 llvm::json::Value toJSON(const FuzzyFindRequest &Request);
62 
63 struct LookupRequest {
64  llvm::DenseSet<SymbolID> IDs;
65 };
66 
67 struct RefsRequest {
68  llvm::DenseSet<SymbolID> IDs;
70  /// If set, limit the number of refers returned from the index. The index may
71  /// choose to return less than this, e.g. it tries to avoid returning stale
72  /// results.
73  llvm::Optional<uint32_t> Limit;
74 };
75 
77  llvm::DenseSet<SymbolID> Subjects;
79  /// If set, limit the number of relations returned from the index.
80  llvm::Optional<uint32_t> Limit;
81 };
82 
83 /// Interface for symbol indexes that can be used for searching or
84 /// matching symbols among a set of symbols based on names or unique IDs.
85 class SymbolIndex {
86 public:
87  virtual ~SymbolIndex() = default;
88 
89  /// Matches symbols in the index fuzzily and applies \p Callback on
90  /// each matched symbol before returning.
91  /// If returned Symbols are used outside Callback, they must be deep-copied!
92  ///
93  /// Returns true if there may be more results (limited by Req.Limit).
94  virtual bool
95  fuzzyFind(const FuzzyFindRequest &Req,
96  llvm::function_ref<void(const Symbol &)> Callback) const = 0;
97 
98  /// Looks up symbols with any of the given symbol IDs and applies \p Callback
99  /// on each matched symbol.
100  /// The returned symbol must be deep-copied if it's used outside Callback.
101  virtual void
102  lookup(const LookupRequest &Req,
103  llvm::function_ref<void(const Symbol &)> Callback) const = 0;
104 
105  /// Finds all occurrences (e.g. references, declarations, definitions) of a
106  /// symbol and applies \p Callback on each result.
107  ///
108  /// Results should be returned in arbitrary order.
109  /// The returned result must be deep-copied if it's used outside Callback.
110  ///
111  /// Returns true if there will be more results (limited by Req.Limit);
112  virtual bool refs(const RefsRequest &Req,
113  llvm::function_ref<void(const Ref &)> Callback) const = 0;
114 
115  /// Finds all relations (S, P, O) stored in the index such that S is among
116  /// Req.Subjects and P is Req.Predicate, and invokes \p Callback for (S, O) in
117  /// each.
118  virtual void relations(
119  const RelationsRequest &Req,
120  llvm::function_ref<void(const SymbolID &Subject, const Symbol &Object)>
121  Callback) const = 0;
122 
123  /// Returns estimated size of index (in bytes).
124  virtual size_t estimateMemoryUsage() const = 0;
125 };
126 
127 // Delegating implementation of SymbolIndex whose delegate can be swapped out.
128 class SwapIndex : public SymbolIndex {
129 public:
130  // If an index is not provided, reset() must be called.
131  SwapIndex(std::unique_ptr<SymbolIndex> Index = nullptr)
132  : Index(std::move(Index)) {}
133  void reset(std::unique_ptr<SymbolIndex>);
134 
135  // SymbolIndex methods delegate to the current index, which is kept alive
136  // until the call returns (even if reset() is called).
137  bool fuzzyFind(const FuzzyFindRequest &,
138  llvm::function_ref<void(const Symbol &)>) const override;
139  void lookup(const LookupRequest &,
140  llvm::function_ref<void(const Symbol &)>) const override;
141  bool refs(const RefsRequest &,
142  llvm::function_ref<void(const Ref &)>) const override;
143  void relations(const RelationsRequest &,
144  llvm::function_ref<void(const SymbolID &, const Symbol &)>)
145  const override;
146 
147  size_t estimateMemoryUsage() const override;
148 
149 private:
150  std::shared_ptr<SymbolIndex> snapshot() const;
151  mutable std::mutex Mutex;
152  std::shared_ptr<SymbolIndex> Index;
153 };
154 
155 } // namespace clangd
156 } // namespace clang
157 
158 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_INDEX_H
SymbolID.h
clang::clangd::RefKind::All
clang::clangd::SwapIndex::SwapIndex
SwapIndex(std::unique_ptr< SymbolIndex > Index=nullptr)
Definition: Index.h:131
clang::clangd::FuzzyFindRequest::PreferredTypes
std::vector< std::string > PreferredTypes
Preferred types of symbols. These are raw representation of OpaqueType.
Definition: Index.h:49
clang::clangd::FuzzyFindRequest::operator==
bool operator==(const FuzzyFindRequest &Req) const
Definition: Index.h:51
clang::clangd::RelationsRequest::Limit
llvm::Optional< uint32_t > Limit
If set, limit the number of relations returned from the index.
Definition: Index.h:80
clang::clangd::SymbolKind::Object
clang::clangd::SwapIndex::reset
void reset(std::unique_ptr< SymbolIndex >)
Definition: Index.cpp:20
clang::clangd::RefKind
RefKind
Describes the kind of a cross-reference.
Definition: Ref.h:30
clang::clangd::SwapIndex
Definition: Index.h:128
clang::clangd::SymbolIndex::~SymbolIndex
virtual ~SymbolIndex()=default
clang::clangd::FuzzyFindRequest::Scopes
std::vector< std::string > Scopes
If this is non-empty, symbols must be in at least one of the scopes (e.g.
Definition: Index.h:36
clang::clangd::RelationsRequest::Predicate
RelationKind Predicate
Definition: Index.h:78
clang::clangd::FuzzyFindRequest
Definition: Index.h:26
clang::clangd::FuzzyFindRequest::Query
std::string Query
A query string for the fuzzy find.
Definition: Index.h:29
clang::clangd::SymbolIndex::estimateMemoryUsage
virtual size_t estimateMemoryUsage() const =0
Returns estimated size of index (in bytes).
Relation.h
clang::clangd::FuzzyFindRequest::operator!=
bool operator!=(const FuzzyFindRequest &Req) const
Definition: Index.h:58
clang::clangd::SymbolIndex::lookup
virtual void lookup(const LookupRequest &Req, llvm::function_ref< void(const Symbol &)> Callback) const =0
Looks up symbols with any of the given symbol IDs and applies Callback on each matched symbol.
clang::clangd::RelationsRequest::Subjects
llvm::DenseSet< SymbolID > Subjects
Definition: Index.h:77
clang::clangd::SymbolIndex::relations
virtual void relations(const RelationsRequest &Req, llvm::function_ref< void(const SymbolID &Subject, const Symbol &Object)> Callback) const =0
Finds all relations (S, P, O) stored in the index such that S is among Req.Subjects and P is Req....
clang::clangd::SwapIndex::relations
void relations(const RelationsRequest &, llvm::function_ref< void(const SymbolID &, const Symbol &)>) const override
Definition: Index.cpp:72
clang::clangd::toJSON
llvm::json::Value toJSON(const FuzzyFindRequest &Request)
Definition: Index.cpp:48
clang::clangd::Symbol
The class presents a C++ symbol, e.g.
Definition: Symbol.h:36
clang::clangd::SwapIndex::refs
bool refs(const RefsRequest &, llvm::function_ref< void(const Ref &)>) const override
Finds all occurrences (e.g.
Definition: Index.cpp:68
clang::clangd::fromJSON
bool fromJSON(const llvm::json::Value &Parameters, FuzzyFindRequest &Request)
Definition: Index.cpp:34
clang::clangd::RefsRequest::IDs
llvm::DenseSet< SymbolID > IDs
Definition: Index.h:68
clang::clangd::FuzzyFindRequest::Limit
llvm::Optional< uint32_t > Limit
The number of top candidates to return.
Definition: Index.h:42
Symbol.h
clang::clangd::LookupRequest::IDs
llvm::DenseSet< SymbolID > IDs
Definition: Index.h:64
clang::clangd::SymbolIndex::refs
virtual bool refs(const RefsRequest &Req, llvm::function_ref< void(const Ref &)> Callback) const =0
Finds all occurrences (e.g.
clang::clangd::SymbolIndex
Interface for symbol indexes that can be used for searching or matching symbols among a set of symbol...
Definition: Index.h:85
clang::clangd::RefsRequest::Filter
RefKind Filter
Definition: Index.h:69
clang::clangd::LookupRequest
Definition: Index.h:63
clang::clangd::Ref
Represents a symbol occurrence in the source file.
Definition: Ref.h:87
Ref.h
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27
clang::clangd::SwapIndex::estimateMemoryUsage
size_t estimateMemoryUsage() const override
Returns estimated size of index (in bytes).
Definition: Index.cpp:78
clang::clangd::RefsRequest::Limit
llvm::Optional< uint32_t > Limit
If set, limit the number of refers returned from the index.
Definition: Index.h:73
clang::clangd::FuzzyFindRequest::AnyScope
bool AnyScope
If set to true, allow symbols from any scope.
Definition: Index.h:39
clang::clangd::Callback
llvm::unique_function< void(llvm::Expected< T >)> Callback
A Callback<T> is a void function that accepts Expected<T>.
Definition: Function.h:28
clang::clangd::RelationsRequest
Definition: Index.h:76
clang::clangd::FuzzyFindRequest::RestrictForCodeCompletion
bool RestrictForCodeCompletion
If set to true, only symbols for completion support will be considered.
Definition: Index.h:44
clang::clangd::SymbolID
Definition: SymbolID.h:31
clang::clangd::SwapIndex::fuzzyFind
bool fuzzyFind(const FuzzyFindRequest &, llvm::function_ref< void(const Symbol &)>) const override
Matches symbols in the index fuzzily and applies Callback on each matched symbol before returning.
Definition: Index.cpp:60
clang::clangd::RefsRequest
Definition: Index.h:67
clang::clangd::FuzzyFindRequest::ProximityPaths
std::vector< std::string > ProximityPaths
Contextually relevant files (e.g.
Definition: Index.h:47
clang::clangd::SwapIndex::lookup
void lookup(const LookupRequest &, llvm::function_ref< void(const Symbol &)>) const override
Looks up symbols with any of the given symbol IDs and applies Callback on each matched symbol.
Definition: Index.cpp:64
clang::clangd::SymbolIndex::fuzzyFind
virtual bool fuzzyFind(const FuzzyFindRequest &Req, llvm::function_ref< void(const Symbol &)> Callback) const =0
Matches symbols in the index fuzzily and applies Callback on each matched symbol before returning.
clang::clangd::RelationKind
RelationKind
Definition: Relation.h:22