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//===- 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();
}
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