1 files changed, 211 insertions, 0 deletions
diff --git a/clang/lib/Index/IndexingAction.cpp b/clang/lib/Index/IndexingAction.cpp
new file mode 100644
index 000000000000..6d6133e89d86
--- /dev/null
+++ b/clang/lib/Index/IndexingAction.cpp
@@ -0,0 +1,211 @@
+//===- IndexingAction.cpp - Frontend index action -------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Index/IndexingAction.h"
+#include "IndexingContext.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendAction.h"
+#include "clang/Frontend/MultiplexConsumer.h"
+#include "clang/Index/IndexDataConsumer.h"
+#include "clang/Lex/PPCallbacks.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Serialization/ASTReader.h"
+#include "llvm/ADT/STLExtras.h"
+#include <memory>
+
+using namespace clang;
+using namespace clang::index;
+
+namespace {
+
+class IndexPPCallbacks final : public PPCallbacks {
+  std::shared_ptr<IndexingContext> IndexCtx;
+
+public:
+  IndexPPCallbacks(std::shared_ptr<IndexingContext> IndexCtx)
+      : IndexCtx(std::move(IndexCtx)) {}
+
+  void MacroExpands(const Token &MacroNameTok, const MacroDefinition &MD,
+                    SourceRange Range, const MacroArgs *Args) override {
+    IndexCtx->handleMacroReference(*MacroNameTok.getIdentifierInfo(),
+                                   Range.getBegin(), *MD.getMacroInfo());
+  }
+
+  void MacroDefined(const Token &MacroNameTok,
+                    const MacroDirective *MD) override {
+    IndexCtx->handleMacroDefined(*MacroNameTok.getIdentifierInfo(),
+                                 MacroNameTok.getLocation(),
+                                 *MD->getMacroInfo());
+  }
+
+  void MacroUndefined(const Token &MacroNameTok, const MacroDefinition &MD,
+                      const MacroDirective *Undef) override {
+    if (!MD.getMacroInfo())  // Ignore noop #undef.
+      return;
+    IndexCtx->handleMacroUndefined(*MacroNameTok.getIdentifierInfo(),
+                                   MacroNameTok.getLocation(),
+                                   *MD.getMacroInfo());
+  }
+};
+
+class IndexASTConsumer final : public ASTConsumer {
+  std::shared_ptr<IndexDataConsumer> DataConsumer;
+  std::shared_ptr<IndexingContext> IndexCtx;
+  std::shared_ptr<Preprocessor> PP;
+  std::function<bool(const Decl *)> ShouldSkipFunctionBody;
+
+public:
+  IndexASTConsumer(std::shared_ptr<IndexDataConsumer> DataConsumer,
+                   const IndexingOptions &Opts,
+                   std::shared_ptr<Preprocessor> PP,
+                   std::function<bool(const Decl *)> ShouldSkipFunctionBody)
+      : DataConsumer(std::move(DataConsumer)),
+        IndexCtx(new IndexingContext(Opts, *this->DataConsumer)),
+        PP(std::move(PP)),
+        ShouldSkipFunctionBody(std::move(ShouldSkipFunctionBody)) {
+    assert(this->DataConsumer != nullptr);
+    assert(this->PP != nullptr);
+  }
+
+protected:
+  void Initialize(ASTContext &Context) override {
+    IndexCtx->setASTContext(Context);
+    IndexCtx->getDataConsumer().initialize(Context);
+    IndexCtx->getDataConsumer().setPreprocessor(PP);
+    PP->addPPCallbacks(std::make_unique<IndexPPCallbacks>(IndexCtx));
+  }
+
+  bool HandleTopLevelDecl(DeclGroupRef DG) override {
+    return IndexCtx->indexDeclGroupRef(DG);
+  }
+
+  void HandleInterestingDecl(DeclGroupRef DG) override {
+    // Ignore deserialized decls.
+  }
+
+  void HandleTopLevelDeclInObjCContainer(DeclGroupRef DG) override {
+    IndexCtx->indexDeclGroupRef(DG);
+  }
+
+  void HandleTranslationUnit(ASTContext &Ctx) override {
+    DataConsumer->finish();
+  }
+
+  bool shouldSkipFunctionBody(Decl *D) override {
+    return ShouldSkipFunctionBody(D);
+  }
+};
+
+class IndexAction final : public ASTFrontendAction {
+  std::shared_ptr<IndexDataConsumer> DataConsumer;
+  IndexingOptions Opts;
+
+public:
+  IndexAction(std::shared_ptr<IndexDataConsumer> DataConsumer,
+              const IndexingOptions &Opts)
+      : DataConsumer(std::move(DataConsumer)), Opts(Opts) {
+    assert(this->DataConsumer != nullptr);
+  }
+
+protected:
+  std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
+                                                 StringRef InFile) override {
+    return std::make_unique<IndexASTConsumer>(
+        DataConsumer, Opts, CI.getPreprocessorPtr(),
+        /*ShouldSkipFunctionBody=*/[](const Decl *) { return false; });
+  }
+};
+
+} // anonymous namespace
+
+std::unique_ptr<ASTConsumer> index::createIndexingASTConsumer(
+    std::shared_ptr<IndexDataConsumer> DataConsumer,
+    const IndexingOptions &Opts, std::shared_ptr<Preprocessor> PP,
+    std::function<bool(const Decl *)> ShouldSkipFunctionBody) {
+  return std::make_unique<IndexASTConsumer>(DataConsumer, Opts, PP,
+                                            ShouldSkipFunctionBody);
+}
+
+std::unique_ptr<FrontendAction>
+index::createIndexingAction(std::shared_ptr<IndexDataConsumer> DataConsumer,
+                            const IndexingOptions &Opts) {
+  assert(DataConsumer != nullptr);
+  return std::make_unique<IndexAction>(std::move(DataConsumer), Opts);
+}
+
+static bool topLevelDeclVisitor(void *context, const Decl *D) {
+  IndexingContext &IndexCtx = *static_cast<IndexingContext*>(context);
+  return IndexCtx.indexTopLevelDecl(D);
+}
+
+static void indexTranslationUnit(ASTUnit &Unit, IndexingContext &IndexCtx) {
+  Unit.visitLocalTopLevelDecls(&IndexCtx, topLevelDeclVisitor);
+}
+
+static void indexPreprocessorMacros(const Preprocessor &PP,
+                                    IndexDataConsumer &DataConsumer) {
+  for (const auto &M : PP.macros())
+    if (MacroDirective *MD = M.second.getLatest())
+      DataConsumer.handleMacroOccurence(
+          M.first, MD->getMacroInfo(),
+          static_cast<unsigned>(index::SymbolRole::Definition),
+          MD->getLocation());
+}
+
+void index::indexASTUnit(ASTUnit &Unit, IndexDataConsumer &DataConsumer,
+                         IndexingOptions Opts) {
+  IndexingContext IndexCtx(Opts, DataConsumer);
+  IndexCtx.setASTContext(Unit.getASTContext());
+  DataConsumer.initialize(Unit.getASTContext());
+  DataConsumer.setPreprocessor(Unit.getPreprocessorPtr());
+
+  if (Opts.IndexMacrosInPreprocessor)
+    indexPreprocessorMacros(Unit.getPreprocessor(), DataConsumer);
+  indexTranslationUnit(Unit, IndexCtx);
+  DataConsumer.finish();
+}
+
+void index::indexTopLevelDecls(ASTContext &Ctx, Preprocessor &PP,
+                               ArrayRef<const Decl *> Decls,
+                               IndexDataConsumer &DataConsumer,
+                               IndexingOptions Opts) {
+  IndexingContext IndexCtx(Opts, DataConsumer);
+  IndexCtx.setASTContext(Ctx);
+
+  DataConsumer.initialize(Ctx);
+
+  if (Opts.IndexMacrosInPreprocessor)
+    indexPreprocessorMacros(PP, DataConsumer);
+
+  for (const Decl *D : Decls)
+    IndexCtx.indexTopLevelDecl(D);
+  DataConsumer.finish();
+}
+
+std::unique_ptr<PPCallbacks>
+index::indexMacrosCallback(IndexDataConsumer &Consumer, IndexingOptions Opts) {
+  return std::make_unique<IndexPPCallbacks>(
+      std::make_shared<IndexingContext>(Opts, Consumer));
+}
+
+void index::indexModuleFile(serialization::ModuleFile &Mod, ASTReader &Reader,
+                            IndexDataConsumer &DataConsumer,
+                            IndexingOptions Opts) {
+  ASTContext &Ctx = Reader.getContext();
+  IndexingContext IndexCtx(Opts, DataConsumer);
+  IndexCtx.setASTContext(Ctx);
+  DataConsumer.initialize(Ctx);
+
+  if (Opts.IndexMacrosInPreprocessor)
+    indexPreprocessorMacros(Reader.getPreprocessor(), DataConsumer);
+
+  for (const Decl *D : Reader.getModuleFileLevelDecls(Mod)) {
+    IndexCtx.indexTopLevelDecl(D);
+  }
+  DataConsumer.finish();
+}