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//===- ModuleDepCollector.cpp - Callbacks to collect deps -------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "clang/Tooling/DependencyScanning/ModuleDepCollector.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Tooling/DependencyScanning/DependencyScanningWorker.h"
using namespace clang;
using namespace tooling;
using namespace dependencies;
std::vector<std::string> ModuleDeps::getFullCommandLine(
std::function<StringRef(ClangModuleDep)> LookupPCMPath,
std::function<const ModuleDeps &(ClangModuleDep)> LookupModuleDeps) const {
std::vector<std::string> Ret = NonPathCommandLine;
// TODO: Build full command line. That also means capturing the original
// command line into NonPathCommandLine.
dependencies::detail::appendCommonModuleArguments(
ClangModuleDeps, LookupPCMPath, LookupModuleDeps, Ret);
return Ret;
}
void dependencies::detail::appendCommonModuleArguments(
llvm::ArrayRef<ClangModuleDep> Modules,
std::function<StringRef(ClangModuleDep)> LookupPCMPath,
std::function<const ModuleDeps &(ClangModuleDep)> LookupModuleDeps,
std::vector<std::string> &Result) {
llvm::StringSet<> AlreadyAdded;
std::function<void(llvm::ArrayRef<ClangModuleDep>)> AddArgs =
[&](llvm::ArrayRef<ClangModuleDep> Modules) {
for (const ClangModuleDep &CMD : Modules) {
if (!AlreadyAdded.insert(CMD.ModuleName + CMD.ContextHash).second)
continue;
const ModuleDeps &M = LookupModuleDeps(CMD);
// Depth first traversal.
AddArgs(M.ClangModuleDeps);
Result.push_back(("-fmodule-file=" + LookupPCMPath(CMD)).str());
if (!M.ClangModuleMapFile.empty()) {
Result.push_back("-fmodule-map-file=" + M.ClangModuleMapFile);
}
}
};
Result.push_back("-fno-implicit-modules");
Result.push_back("-fno-implicit-module-maps");
AddArgs(Modules);
}
void ModuleDepCollectorPP::FileChanged(SourceLocation Loc,
FileChangeReason Reason,
SrcMgr::CharacteristicKind FileType,
FileID PrevFID) {
if (Reason != PPCallbacks::EnterFile)
return;
// This has to be delayed as the context hash can change at the start of
// `CompilerInstance::ExecuteAction`.
if (MDC.ContextHash.empty()) {
MDC.ContextHash = Instance.getInvocation().getModuleHash();
MDC.Consumer.handleContextHash(MDC.ContextHash);
}
SourceManager &SM = Instance.getSourceManager();
// Dependency generation really does want to go all the way to the
// file entry for a source location to find out what is depended on.
// We do not want #line markers to affect dependency generation!
Optional<FileEntryRef> File =
SM.getFileEntryRefForID(SM.getFileID(SM.getExpansionLoc(Loc)));
if (!File)
return;
StringRef FileName =
llvm::sys::path::remove_leading_dotslash(File->getName());
MDC.MainDeps.push_back(std::string(FileName));
}
void ModuleDepCollectorPP::InclusionDirective(
SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName,
bool IsAngled, CharSourceRange FilenameRange, const FileEntry *File,
StringRef SearchPath, StringRef RelativePath, const Module *Imported,
SrcMgr::CharacteristicKind FileType) {
if (!File && !Imported) {
// This is a non-modular include that HeaderSearch failed to find. Add it
// here as `FileChanged` will never see it.
MDC.MainDeps.push_back(std::string(FileName));
}
handleImport(Imported);
}
void ModuleDepCollectorPP::moduleImport(SourceLocation ImportLoc,
ModuleIdPath Path,
const Module *Imported) {
handleImport(Imported);
}
void ModuleDepCollectorPP::handleImport(const Module *Imported) {
if (!Imported)
return;
MDC.Deps[MDC.ContextHash + Imported->getTopLevelModule()->getFullModuleName()]
.ImportedByMainFile = true;
DirectDeps.insert(Imported->getTopLevelModule());
}
void ModuleDepCollectorPP::EndOfMainFile() {
FileID MainFileID = Instance.getSourceManager().getMainFileID();
MDC.MainFile = std::string(
Instance.getSourceManager().getFileEntryForID(MainFileID)->getName());
for (const Module *M : DirectDeps) {
handleTopLevelModule(M);
}
for (auto &&I : MDC.Deps)
MDC.Consumer.handleModuleDependency(I.second);
for (auto &&I : MDC.MainDeps)
MDC.Consumer.handleFileDependency(*MDC.Opts, I);
}
void ModuleDepCollectorPP::handleTopLevelModule(const Module *M) {
assert(M == M->getTopLevelModule() && "Expected top level module!");
auto ModI = MDC.Deps.insert(
std::make_pair(MDC.ContextHash + M->getFullModuleName(), ModuleDeps{}));
if (!ModI.first->second.ModuleName.empty())
return;
ModuleDeps &MD = ModI.first->second;
const FileEntry *ModuleMap = Instance.getPreprocessor()
.getHeaderSearchInfo()
.getModuleMap()
.getContainingModuleMapFile(M);
MD.ClangModuleMapFile = std::string(ModuleMap ? ModuleMap->getName() : "");
MD.ModuleName = M->getFullModuleName();
MD.ImplicitModulePCMPath = std::string(M->getASTFile()->getName());
MD.ContextHash = MDC.ContextHash;
serialization::ModuleFile *MF =
MDC.Instance.getASTReader()->getModuleManager().lookup(M->getASTFile());
MDC.Instance.getASTReader()->visitInputFiles(
*MF, true, true, [&](const serialization::InputFile &IF, bool isSystem) {
MD.FileDeps.insert(IF.getFile()->getName());
});
llvm::DenseSet<const Module *> AddedModules;
addAllSubmoduleDeps(M, MD, AddedModules);
}
void ModuleDepCollectorPP::addAllSubmoduleDeps(
const Module *M, ModuleDeps &MD,
llvm::DenseSet<const Module *> &AddedModules) {
addModuleDep(M, MD, AddedModules);
for (const Module *SubM : M->submodules())
addAllSubmoduleDeps(SubM, MD, AddedModules);
}
void ModuleDepCollectorPP::addModuleDep(
const Module *M, ModuleDeps &MD,
llvm::DenseSet<const Module *> &AddedModules) {
for (const Module *Import : M->Imports) {
if (Import->getTopLevelModule() != M->getTopLevelModule()) {
if (AddedModules.insert(Import->getTopLevelModule()).second)
MD.ClangModuleDeps.push_back(
{std::string(Import->getTopLevelModuleName()),
Instance.getInvocation().getModuleHash()});
handleTopLevelModule(Import->getTopLevelModule());
}
}
}
ModuleDepCollector::ModuleDepCollector(
std::unique_ptr<DependencyOutputOptions> Opts, CompilerInstance &I,
DependencyConsumer &C)
: Instance(I), Consumer(C), Opts(std::move(Opts)) {}
void ModuleDepCollector::attachToPreprocessor(Preprocessor &PP) {
PP.addPPCallbacks(std::make_unique<ModuleDepCollectorPP>(Instance, *this));
}
void ModuleDepCollector::attachToASTReader(ASTReader &R) {}
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