clang-tools-extra/clangd/ASTSignals.h

   1 //===--- ASTSignals.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_ASTSIGNALS_H
  10 #define LLVM_CLANG_TOOLS_EXTRA_CLANGD_ASTSIGNALS_H
  11
  12 #include "ParsedAST.h"
  13 #include "index/SymbolID.h"
  14 #include "llvm/ADT/DenseMap.h"
  15 #include "llvm/ADT/StringMap.h"
  16
  17 namespace clang {
  18 namespace clangd {
  19
  20 /// Signals derived from a valid AST of a file.
  21 /// Provides information that can only be extracted from the AST to actions that
  22 /// can't access an AST. The signals are computed and updated asynchronously by
  23 /// the ASTWorker and thus they are always stale and also can be absent.
  24 /// Example usage: Information about the declarations used in a file affects
  25 /// code-completion ranking in that file.
  26 struct ASTSignals {
  27   /// Number of occurrences of each symbol present in the file.
  28   llvm::DenseMap<SymbolID, unsigned> ReferencedSymbols;
  29   /// Namespaces whose symbols are used in the file, and the number of such
  30   /// distinct symbols.
  31   llvm::StringMap<unsigned> RelatedNamespaces;
  32
  33   static ASTSignals derive(const ParsedAST &AST);
  34 };
  35
  36 } // namespace clangd
  37 } // namespace clang
  38
  39 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANGD_ASTSIGNALS_H