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//===--- GlobalSymbolBuilderMain.cpp -----------------------------*- C++-*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// GlobalSymbolBuilder is a tool to generate YAML-format symbols across the
// whole project. This tools is for **experimental** only. Don't use it in
// production code.
//
//===---------------------------------------------------------------------===//
#include "index/CanonicalIncludes.h"
#include "index/Index.h"
#include "index/Merge.h"
#include "index/SymbolCollector.h"
#include "index/SymbolYAML.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Index/IndexDataConsumer.h"
#include "clang/Index/IndexingAction.h"
#include "clang/Tooling/CommonOptionsParser.h"
#include "clang/Tooling/Execution.h"
#include "clang/Tooling/Tooling.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/ThreadPool.h"
using namespace llvm;
using namespace clang::tooling;
using clang::clangd::SymbolSlab;
namespace clang {
namespace clangd {
namespace {
static llvm::cl::opt<std::string> AssumedHeaderDir(
"assume-header-dir",
llvm::cl::desc("The index includes header that a symbol is defined in. "
"If the absolute path cannot be determined (e.g. an "
"in-memory VFS) then the relative path is resolved against "
"this directory, which must be absolute. If this flag is "
"not given, such headers will have relative paths."),
llvm::cl::init(""));
class SymbolIndexActionFactory : public tooling::FrontendActionFactory {
public:
SymbolIndexActionFactory(tooling::ExecutionContext *Ctx) : Ctx(Ctx) {}
clang::FrontendAction *create() override {
// Wraps the index action and reports collected symbols to the execution
// context at the end of each translation unit.
class WrappedIndexAction : public WrapperFrontendAction {
public:
WrappedIndexAction(std::shared_ptr<SymbolCollector> C,
std::unique_ptr<CanonicalIncludes> Includes,
const index::IndexingOptions &Opts,
tooling::ExecutionContext *Ctx)
: WrapperFrontendAction(
index::createIndexingAction(C, Opts, nullptr)),
Ctx(Ctx), Collector(C), Includes(std::move(Includes)),
PragmaHandler(collectIWYUHeaderMaps(this->Includes.get())) {}
std::unique_ptr<ASTConsumer>
CreateASTConsumer(CompilerInstance &CI, StringRef InFile) override {
CI.getPreprocessor().addCommentHandler(PragmaHandler.get());
return WrapperFrontendAction::CreateASTConsumer(CI, InFile);
}
void EndSourceFileAction() override {
WrapperFrontendAction::EndSourceFileAction();
auto Symbols = Collector->takeSymbols();
for (const auto &Sym : Symbols) {
std::string IDStr;
llvm::raw_string_ostream OS(IDStr);
OS << Sym.ID;
Ctx->reportResult(OS.str(), SymbolToYAML(Sym));
}
}
private:
tooling::ExecutionContext *Ctx;
std::shared_ptr<SymbolCollector> Collector;
std::unique_ptr<CanonicalIncludes> Includes;
std::unique_ptr<CommentHandler> PragmaHandler;
};
index::IndexingOptions IndexOpts;
IndexOpts.SystemSymbolFilter =
index::IndexingOptions::SystemSymbolFilterKind::All;
IndexOpts.IndexFunctionLocals = false;
auto CollectorOpts = SymbolCollector::Options();
CollectorOpts.FallbackDir = AssumedHeaderDir;
CollectorOpts.CollectIncludePath = true;
auto Includes = llvm::make_unique<CanonicalIncludes>();
addSystemHeadersMapping(Includes.get());
CollectorOpts.Includes = Includes.get();
return new WrappedIndexAction(
std::make_shared<SymbolCollector>(std::move(CollectorOpts)),
std::move(Includes), IndexOpts, Ctx);
}
tooling::ExecutionContext *Ctx;
};
// Combine occurrences of the same symbol across translation units.
SymbolSlab mergeSymbols(tooling::ToolResults *Results) {
SymbolSlab::Builder UniqueSymbols;
llvm::BumpPtrAllocator Arena;
Symbol::Details Scratch;
Results->forEachResult([&](llvm::StringRef Key, llvm::StringRef Value) {
Arena.Reset();
auto Sym = clang::clangd::SymbolFromYAML(Value, Arena);
clang::clangd::SymbolID ID;
Key >> ID;
if (const auto *Existing = UniqueSymbols.find(ID))
UniqueSymbols.insert(mergeSymbol(*Existing, Sym, &Scratch));
else
UniqueSymbols.insert(Sym);
});
return std::move(UniqueSymbols).build();
}
} // namespace
} // namespace clangd
} // namespace clang
int main(int argc, const char **argv) {
llvm::sys::PrintStackTraceOnErrorSignal(argv[0]);
const char* Overview =
"This is an **experimental** tool to generate YAML-format "
"project-wide symbols for clangd (global code completion). It would be "
"changed and deprecated eventually. Don't use it in production code!";
auto Executor = clang::tooling::createExecutorFromCommandLineArgs(
argc, argv, cl::GeneralCategory, Overview);
if (!Executor) {
llvm::errs() << llvm::toString(Executor.takeError()) << "\n";
return 1;
}
if (!clang::clangd::AssumedHeaderDir.empty() &&
!llvm::sys::path::is_absolute(clang::clangd::AssumedHeaderDir)) {
llvm::errs() << "--assume-header-dir must be an absolute path.\n";
return 1;
}
// Map phase: emit symbols found in each translation unit.
auto Err = Executor->get()->execute(
llvm::make_unique<clang::clangd::SymbolIndexActionFactory>(
Executor->get()->getExecutionContext()));
if (Err) {
llvm::errs() << llvm::toString(std::move(Err)) << "\n";
}
// Reduce phase: combine symbols using the ID as a key.
auto UniqueSymbols =
clang::clangd::mergeSymbols(Executor->get()->getToolResults());
// Output phase: emit YAML for result symbols.
SymbolsToYAML(UniqueSymbols, llvm::outs());
return 0;
}
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