From f4fb85b1c74e88c7b3d4346e5a52348f97bb7ecd Mon Sep 17 00:00:00 2001
From: Argyrios Kyrtzidis <akyrtzi@gmail.com>
Date: Fri, 12 Feb 2016 23:10:59 +0000
Subject: [libclang] Separate the underlying indexing functionality of libclang
 and introduce it into the clangIndex library.

It is a general goodness for libclang itself to mostly be a wrapper of functionality provided by the libraries.

llvm-svn: 260760
---
 clang/lib/Index/IndexingAction.cpp | 140 +++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 clang/lib/Index/IndexingAction.cpp

(limited to 'clang/lib/Index/IndexingAction.cpp')

diff --git a/clang/lib/Index/IndexingAction.cpp b/clang/lib/Index/IndexingAction.cpp
new file mode 100644
index 00000000000..3f7ef43e7dc
--- /dev/null
+++ b/clang/lib/Index/IndexingAction.cpp
@@ -0,0 +1,140 @@
+//===- IndexingAction.cpp - Frontend index action -------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Index/IndexingAction.h"
+#include "clang/Index/IndexDataConsumer.h"
+#include "IndexingContext.h"
+#include "clang/Frontend/FrontendAction.h"
+#include "clang/Frontend/MultiplexConsumer.h"
+#include "clang/Lex/Preprocessor.h"
+
+using namespace clang;
+using namespace clang::index;
+
+void IndexDataConsumer::_anchor() {}
+
+bool IndexDataConsumer::handleDeclOccurence(const Decl *D, SymbolRoleSet Roles,
+                                            ArrayRef<SymbolRelation> Relations,
+                                            FileID FID, unsigned Offset,
+                                            ASTNodeInfo ASTNode) {
+  return true;
+}
+
+bool IndexDataConsumer::handleMacroOccurence(const IdentifierInfo *Name,
+                                             const MacroInfo *MI, SymbolRoleSet Roles,
+                                             FileID FID, unsigned Offset) {
+  return true;
+}
+
+bool IndexDataConsumer::handleModuleOccurence(const ImportDecl *ImportD,
+                                              SymbolRoleSet Roles,
+                                              FileID FID, unsigned Offset) {
+  return true;
+}
+
+namespace {
+
+class IndexASTConsumer : public ASTConsumer {
+  IndexingContext &IndexCtx;
+
+public:
+  IndexASTConsumer(IndexingContext &IndexCtx)
+    : IndexCtx(IndexCtx) {}
+
+protected:
+  void Initialize(ASTContext &Context) override {
+    IndexCtx.setASTContext(Context);
+  }
+
+  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 {
+  }
+};
+
+class IndexAction : public WrapperFrontendAction {
+  IndexingOptions IndexOpts;
+  std::shared_ptr<IndexDataConsumer> DataConsumer;
+  std::unique_ptr<IndexingContext> IndexCtx;
+
+public:
+  IndexAction(std::unique_ptr<FrontendAction> WrappedAction,
+              std::shared_ptr<IndexDataConsumer> DataConsumer,
+              IndexingOptions Opts)
+    : WrapperFrontendAction(std::move(WrappedAction)),
+      IndexOpts(Opts),
+      DataConsumer(std::move(DataConsumer)) {}
+
+protected:
+  std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
+                                                 StringRef InFile) override;
+  void EndSourceFileAction() override;
+};
+
+} // anonymous namespace
+
+void IndexAction::EndSourceFileAction() {
+  // Invoke wrapped action's method.
+  WrapperFrontendAction::EndSourceFileAction();
+
+  bool IndexActionFailed = !IndexCtx;
+  if (!IndexActionFailed)
+    DataConsumer->finish();
+}
+
+std::unique_ptr<ASTConsumer>
+IndexAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  auto OtherConsumer = WrapperFrontendAction::CreateASTConsumer(CI, InFile);
+  if (!OtherConsumer)
+    return nullptr;
+
+  IndexCtx.reset(new IndexingContext(IndexOpts, *DataConsumer));
+
+  std::vector<std::unique_ptr<ASTConsumer>> Consumers;
+  Consumers.push_back(std::move(OtherConsumer));
+  Consumers.push_back(llvm::make_unique<IndexASTConsumer>(*IndexCtx));
+  return llvm::make_unique<MultiplexConsumer>(std::move(Consumers));
+}
+
+std::unique_ptr<FrontendAction>
+index::createIndexingAction(std::unique_ptr<FrontendAction> WrappedAction,
+                            std::shared_ptr<IndexDataConsumer> DataConsumer,
+                            IndexingOptions Opts) {
+  return llvm::make_unique<IndexAction>(std::move(WrappedAction),
+                                        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);
+}
+
+void index::indexASTUnit(ASTUnit &Unit,
+                         std::shared_ptr<IndexDataConsumer> DataConsumer,
+                         IndexingOptions Opts) {
+  IndexingContext IndexCtx(Opts, *DataConsumer);
+  IndexCtx.setASTContext(Unit.getASTContext());
+  indexTranslationUnit(Unit, IndexCtx);
+}
-- 
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