clang-tools-extra/clangd/ASTSignals.cpp

   1 //===--- ASTSignals.cpp ------------------------------------------*- 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 #include "ASTSignals.h"
  10 #include "AST.h"
  11 #include "FindTarget.h"
  12 #include "Headers.h"
  13 #include "support/Trace.h"
  14 #include "clang/AST/DeclObjC.h"
  15
  16 namespace clang {
  17 namespace clangd {
  18 ASTSignals ASTSignals::derive(const ParsedAST &AST) {
  19   trace::Span Span("ASTSignals::derive");
  20   ASTSignals Signals;
  21   Signals.InsertionDirective = preferredIncludeDirective(
  22       AST.tuPath(), AST.getLangOpts(),
  23       AST.getIncludeStructure().MainFileIncludes, AST.getLocalTopLevelDecls());
  24   const SourceManager &SM = AST.getSourceManager();
  25   findExplicitReferences(
  26       AST.getASTContext(),
  27       [&](ReferenceLoc Ref) {
  28         for (const NamedDecl *ND : Ref.Targets) {
  29           if (!isInsideMainFile(Ref.NameLoc, SM))
  30             continue;
  31           SymbolID ID = getSymbolID(ND);
  32           if (!ID)
  33             continue;
  34           unsigned &SymbolCount = Signals.ReferencedSymbols[ID];
  35           SymbolCount++;
  36           // Process namespace only when we see the symbol for the first time.
  37           if (SymbolCount != 1)
  38             continue;
  39           if (const auto *NSD = dyn_cast<NamespaceDecl>(ND->getDeclContext())) {
  40             if (NSD->isAnonymousNamespace())
  41               continue;
  42             std::string NS = printNamespaceScope(*NSD);
  43             if (!NS.empty())
  44               Signals.RelatedNamespaces[NS]++;
  45           }
  46         }
  47       },
  48       AST.getHeuristicResolver());
  49   return Signals;
  50 }
  51 } // namespace clangd
  52 } // namespace clang