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ClangScanDeps.cpp
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ClangScanDeps.cpp
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//===- ClangScanDeps.cpp - Implementation of clang-scan-deps --------------===//
//
// 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/Frontend/CompilerInstance.h"
#include "clang/Tooling/CommonOptionsParser.h"
#include "clang/Tooling/DependencyScanning/DependencyScanningService.h"
#include "clang/Tooling/DependencyScanning/DependencyScanningWorker.h"
#include "clang/Tooling/JSONCompilationDatabase.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/Options.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/Threading.h"
#include <mutex>
#include <thread>
using namespace clang;
using namespace tooling::dependencies;
namespace {
class SharedStream {
public:
SharedStream(raw_ostream &OS) : OS(OS) {}
void applyLocked(llvm::function_ref<void(raw_ostream &OS)> Fn) {
std::unique_lock<std::mutex> LockGuard(Lock);
Fn(OS);
OS.flush();
}
private:
std::mutex Lock;
raw_ostream &OS;
};
/// The high-level implementation of the dependency discovery tool that runs on
/// an individual worker thread.
class DependencyScanningTool {
public:
/// Construct a dependency scanning tool.
///
/// \param Compilations The reference to the compilation database that's
/// used by the clang tool.
DependencyScanningTool(DependencyScanningService &Service,
const tooling::CompilationDatabase &Compilations,
SharedStream &OS, SharedStream &Errs)
: Worker(Service), Compilations(Compilations), OS(OS), Errs(Errs) {}
/// Computes the dependencies for the given file and prints them out.
///
/// \returns True on error.
bool runOnFile(const std::string &Input, StringRef CWD) {
auto MaybeFile = Worker.getDependencyFile(Input, CWD, Compilations);
if (!MaybeFile) {
llvm::handleAllErrors(
MaybeFile.takeError(), [this, &Input](llvm::StringError &Err) {
Errs.applyLocked([&](raw_ostream &OS) {
OS << "Error while scanning dependencies for " << Input << ":\n";
OS << Err.getMessage();
});
});
return true;
}
OS.applyLocked([&](raw_ostream &OS) { OS << *MaybeFile; });
return false;
}
private:
DependencyScanningWorker Worker;
const tooling::CompilationDatabase &Compilations;
SharedStream &OS;
SharedStream &Errs;
};
llvm::cl::opt<bool> Help("h", llvm::cl::desc("Alias for -help"),
llvm::cl::Hidden);
llvm::cl::OptionCategory DependencyScannerCategory("Tool options");
static llvm::cl::opt<ScanningMode> ScanMode(
"mode",
llvm::cl::desc("The preprocessing mode used to compute the dependencies"),
llvm::cl::values(
clEnumValN(ScanningMode::MinimizedSourcePreprocessing,
"preprocess-minimized-sources",
"The set of dependencies is computed by preprocessing the "
"source files that were minimized to only include the "
"contents that might affect the dependencies"),
clEnumValN(ScanningMode::CanonicalPreprocessing, "preprocess",
"The set of dependencies is computed by preprocessing the "
"unmodified source files")),
llvm::cl::init(ScanningMode::MinimizedSourcePreprocessing));
llvm::cl::opt<unsigned>
NumThreads("j", llvm::cl::Optional,
llvm::cl::desc("Number of worker threads to use (default: use "
"all concurrent threads)"),
llvm::cl::init(0));
llvm::cl::opt<std::string>
CompilationDB("compilation-database",
llvm::cl::desc("Compilation database"), llvm::cl::Required,
llvm::cl::cat(DependencyScannerCategory));
} // end anonymous namespace
int main(int argc, const char **argv) {
llvm::InitLLVM X(argc, argv);
llvm::cl::HideUnrelatedOptions(DependencyScannerCategory);
if (!llvm::cl::ParseCommandLineOptions(argc, argv))
return 1;
std::string ErrorMessage;
std::unique_ptr<tooling::JSONCompilationDatabase> Compilations =
tooling::JSONCompilationDatabase::loadFromFile(
CompilationDB, ErrorMessage,
tooling::JSONCommandLineSyntax::AutoDetect);
if (!Compilations) {
llvm::errs() << "error: " << ErrorMessage << "\n";
return 1;
}
llvm::cl::PrintOptionValues();
// By default the tool runs on all inputs in the CDB.
std::vector<std::pair<std::string, std::string>> Inputs;
for (const auto &Command : Compilations->getAllCompileCommands())
Inputs.emplace_back(Command.Filename, Command.Directory);
// The command options are rewritten to run Clang in preprocessor only mode.
auto AdjustingCompilations =
llvm::make_unique<tooling::ArgumentsAdjustingCompilations>(
std::move(Compilations));
AdjustingCompilations->appendArgumentsAdjuster(
[](const tooling::CommandLineArguments &Args, StringRef /*unused*/) {
tooling::CommandLineArguments AdjustedArgs = Args;
AdjustedArgs.push_back("-o");
AdjustedArgs.push_back("/dev/null");
AdjustedArgs.push_back("-Xclang");
AdjustedArgs.push_back("-Eonly");
AdjustedArgs.push_back("-Xclang");
AdjustedArgs.push_back("-sys-header-deps");
AdjustedArgs.push_back("-Wno-error");
return AdjustedArgs;
});
SharedStream Errs(llvm::errs());
// Print out the dependency results to STDOUT by default.
SharedStream DependencyOS(llvm::outs());
DependencyScanningService Service(ScanMode);
unsigned NumWorkers =
NumThreads == 0 ? llvm::hardware_concurrency() : NumThreads;
std::vector<std::unique_ptr<DependencyScanningTool>> WorkerTools;
for (unsigned I = 0; I < NumWorkers; ++I)
WorkerTools.push_back(llvm::make_unique<DependencyScanningTool>(
Service, *AdjustingCompilations, DependencyOS, Errs));
std::vector<std::thread> WorkerThreads;
std::atomic<bool> HadErrors(false);
std::mutex Lock;
size_t Index = 0;
llvm::outs() << "Running clang-scan-deps on " << Inputs.size()
<< " files using " << NumWorkers << " workers\n";
for (unsigned I = 0; I < NumWorkers; ++I) {
WorkerThreads.emplace_back(
[I, &Lock, &Index, &Inputs, &HadErrors, &WorkerTools]() {
while (true) {
std::string Input;
StringRef CWD;
// Take the next input.
{
std::unique_lock<std::mutex> LockGuard(Lock);
if (Index >= Inputs.size())
return;
const auto &Compilation = Inputs[Index++];
Input = Compilation.first;
CWD = Compilation.second;
}
// Run the tool on it.
if (WorkerTools[I]->runOnFile(Input, CWD))
HadErrors = true;
}
});
}
for (auto &W : WorkerThreads)
W.join();
return HadErrors;
}