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llvm-project/clang/lib/Basic/Module.cpp

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//===--- Module.cpp - Describe a module -----------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the Module class, which describes a module in the source
// code.
//
//===----------------------------------------------------------------------===//
#include "clang/Basic/Module.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang;
Module::Module(StringRef Name, SourceLocation DefinitionLoc, Module *Parent,
bool IsFramework, bool IsExplicit)
: Name(Name), DefinitionLoc(DefinitionLoc), Parent(Parent),
Umbrella(), ASTFile(nullptr), IsMissingRequirement(false),
IsAvailable(true), IsFromModuleFile(false), IsFramework(IsFramework),
IsExplicit(IsExplicit), IsSystem(false), IsExternC(false),
IsInferred(false), InferSubmodules(false), InferExplicitSubmodules(false),
InferExportWildcard(false), ConfigMacrosExhaustive(false),
NameVisibility(Hidden) {
if (Parent) {
if (!Parent->isAvailable())
IsAvailable = false;
if (Parent->IsSystem)
IsSystem = true;
if (Parent->IsExternC)
IsExternC = true;
IsMissingRequirement = Parent->IsMissingRequirement;
Parent->SubModuleIndex[Name] = Parent->SubModules.size();
Parent->SubModules.push_back(this);
}
}
Module::~Module() {
for (submodule_iterator I = submodule_begin(), IEnd = submodule_end();
I != IEnd; ++I) {
delete *I;
}
}
/// \brief Determine whether a translation unit built using the current
/// language options has the given feature.
static bool hasFeature(StringRef Feature, const LangOptions &LangOpts,
const TargetInfo &Target) {
return llvm::StringSwitch<bool>(Feature)
.Case("altivec", LangOpts.AltiVec)
.Case("blocks", LangOpts.Blocks)
.Case("cplusplus", LangOpts.CPlusPlus)
.Case("cplusplus11", LangOpts.CPlusPlus11)
.Case("objc", LangOpts.ObjC1)
.Case("objc_arc", LangOpts.ObjCAutoRefCount)
.Case("opencl", LangOpts.OpenCL)
.Case("tls", Target.isTLSSupported())
.Default(Target.hasFeature(Feature));
}
bool
Module::isAvailable(const LangOptions &LangOpts, const TargetInfo &Target,
Requirement &Req, HeaderDirective &MissingHeader) const {
if (IsAvailable)
return true;
for (const Module *Current = this; Current; Current = Current->Parent) {
if (!Current->MissingHeaders.empty()) {
MissingHeader = Current->MissingHeaders.front();
return false;
}
for (unsigned I = 0, N = Current->Requirements.size(); I != N; ++I) {
if (hasFeature(Current->Requirements[I].first, LangOpts, Target) !=
Current->Requirements[I].second) {
Req = Current->Requirements[I];
return false;
}
}
}
llvm_unreachable("could not find a reason why module is unavailable");
}
bool Module::isSubModuleOf(const Module *Other) const {
const Module *This = this;
do {
if (This == Other)
return true;
This = This->Parent;
} while (This);
return false;
}
const Module *Module::getTopLevelModule() const {
const Module *Result = this;
while (Result->Parent)
Result = Result->Parent;
return Result;
}
std::string Module::getFullModuleName() const {
SmallVector<StringRef, 2> Names;
// Build up the set of module names (from innermost to outermost).
for (const Module *M = this; M; M = M->Parent)
Names.push_back(M->Name);
std::string Result;
for (SmallVectorImpl<StringRef>::reverse_iterator I = Names.rbegin(),
IEnd = Names.rend();
I != IEnd; ++I) {
if (!Result.empty())
Result += '.';
Result += *I;
}
return Result;
}
const DirectoryEntry *Module::getUmbrellaDir() const {
if (const FileEntry *Header = getUmbrellaHeader())
return Header->getDir();
return Umbrella.dyn_cast<const DirectoryEntry *>();
}
ArrayRef<const FileEntry *> Module::getTopHeaders(FileManager &FileMgr) {
if (!TopHeaderNames.empty()) {
for (std::vector<std::string>::iterator
I = TopHeaderNames.begin(), E = TopHeaderNames.end(); I != E; ++I) {
if (const FileEntry *FE = FileMgr.getFile(*I))
TopHeaders.insert(FE);
}
TopHeaderNames.clear();
}
return llvm::makeArrayRef(TopHeaders.begin(), TopHeaders.end());
}
void Module::addRequirement(StringRef Feature, bool RequiredState,
const LangOptions &LangOpts,
const TargetInfo &Target) {
Requirements.push_back(Requirement(Feature, RequiredState));
// If this feature is currently available, we're done.
if (hasFeature(Feature, LangOpts, Target) == RequiredState)
return;
markUnavailable(/*MissingRequirement*/true);
}
void Module::markUnavailable(bool MissingRequirement) {
if (!IsAvailable)
return;
SmallVector<Module *, 2> Stack;
Stack.push_back(this);
while (!Stack.empty()) {
Module *Current = Stack.back();
Stack.pop_back();
if (!Current->IsAvailable)
continue;
Current->IsAvailable = false;
Current->IsMissingRequirement |= MissingRequirement;
for (submodule_iterator Sub = Current->submodule_begin(),
SubEnd = Current->submodule_end();
Sub != SubEnd; ++Sub) {
if ((*Sub)->IsAvailable)
Stack.push_back(*Sub);
}
}
}
Module *Module::findSubmodule(StringRef Name) const {
llvm::StringMap<unsigned>::const_iterator Pos = SubModuleIndex.find(Name);
if (Pos == SubModuleIndex.end())
return nullptr;
return SubModules[Pos->getValue()];
}
static void printModuleId(raw_ostream &OS, const ModuleId &Id) {
for (unsigned I = 0, N = Id.size(); I != N; ++I) {
if (I)
OS << ".";
OS << Id[I].first;
}
}
void Module::getExportedModules(SmallVectorImpl<Module *> &Exported) const {
// All non-explicit submodules are exported.
for (std::vector<Module *>::const_iterator I = SubModules.begin(),
E = SubModules.end();
I != E; ++I) {
Module *Mod = *I;
if (!Mod->IsExplicit)
Exported.push_back(Mod);
}
// Find re-exported modules by filtering the list of imported modules.
bool AnyWildcard = false;
bool UnrestrictedWildcard = false;
SmallVector<Module *, 4> WildcardRestrictions;
for (unsigned I = 0, N = Exports.size(); I != N; ++I) {
Module *Mod = Exports[I].getPointer();
if (!Exports[I].getInt()) {
// Export a named module directly; no wildcards involved.
Exported.push_back(Mod);
continue;
}
// Wildcard export: export all of the imported modules that match
// the given pattern.
AnyWildcard = true;
if (UnrestrictedWildcard)
continue;
if (Module *Restriction = Exports[I].getPointer())
WildcardRestrictions.push_back(Restriction);
else {
WildcardRestrictions.clear();
UnrestrictedWildcard = true;
}
}
// If there were any wildcards, push any imported modules that were
// re-exported by the wildcard restriction.
if (!AnyWildcard)
return;
for (unsigned I = 0, N = Imports.size(); I != N; ++I) {
Module *Mod = Imports[I];
bool Acceptable = UnrestrictedWildcard;
if (!Acceptable) {
// Check whether this module meets one of the restrictions.
for (unsigned R = 0, NR = WildcardRestrictions.size(); R != NR; ++R) {
Module *Restriction = WildcardRestrictions[R];
if (Mod == Restriction || Mod->isSubModuleOf(Restriction)) {
Acceptable = true;
break;
}
}
}
if (!Acceptable)
continue;
Exported.push_back(Mod);
}
}
void Module::buildVisibleModulesCache() const {
assert(VisibleModulesCache.empty() && "cache does not need building");
// This module is visible to itself.
VisibleModulesCache.insert(this);
// Every imported module is visible.
SmallVector<Module *, 16> Stack(Imports.begin(), Imports.end());
while (!Stack.empty()) {
Module *CurrModule = Stack.pop_back_val();
// Every module transitively exported by an imported module is visible.
if (VisibleModulesCache.insert(CurrModule).second)
CurrModule->getExportedModules(Stack);
}
}
void Module::print(raw_ostream &OS, unsigned Indent) const {
OS.indent(Indent);
if (IsFramework)
OS << "framework ";
if (IsExplicit)
OS << "explicit ";
OS << "module " << Name;
if (IsSystem) {
OS.indent(Indent + 2);
OS << " [system]";
}
OS << " {\n";
if (!Requirements.empty()) {
OS.indent(Indent + 2);
OS << "requires ";
for (unsigned I = 0, N = Requirements.size(); I != N; ++I) {
if (I)
OS << ", ";
if (!Requirements[I].second)
OS << "!";
OS << Requirements[I].first;
}
OS << "\n";
}
if (const FileEntry *UmbrellaHeader = getUmbrellaHeader()) {
OS.indent(Indent + 2);
OS << "umbrella header \"";
OS.write_escaped(UmbrellaHeader->getName());
OS << "\"\n";
} else if (const DirectoryEntry *UmbrellaDir = getUmbrellaDir()) {
OS.indent(Indent + 2);
OS << "umbrella \"";
OS.write_escaped(UmbrellaDir->getName());
OS << "\"\n";
}
if (!ConfigMacros.empty() || ConfigMacrosExhaustive) {
OS.indent(Indent + 2);
OS << "config_macros ";
if (ConfigMacrosExhaustive)
OS << "[exhaustive]";
for (unsigned I = 0, N = ConfigMacros.size(); I != N; ++I) {
if (I)
OS << ", ";
OS << ConfigMacros[I];
}
OS << "\n";
}
for (unsigned I = 0, N = NormalHeaders.size(); I != N; ++I) {
OS.indent(Indent + 2);
OS << "header \"";
OS.write_escaped(NormalHeaders[I]->getName());
OS << "\"\n";
}
for (unsigned I = 0, N = ExcludedHeaders.size(); I != N; ++I) {
OS.indent(Indent + 2);
OS << "exclude header \"";
OS.write_escaped(ExcludedHeaders[I]->getName());
OS << "\"\n";
}
for (unsigned I = 0, N = PrivateHeaders.size(); I != N; ++I) {
OS.indent(Indent + 2);
OS << "private header \"";
OS.write_escaped(PrivateHeaders[I]->getName());
OS << "\"\n";
}
for (submodule_const_iterator MI = submodule_begin(), MIEnd = submodule_end();
MI != MIEnd; ++MI)
// Print inferred subframework modules so that we don't need to re-infer
// them (requires expensive directory iteration + stat calls) when we build
// the module. Regular inferred submodules are OK, as we need to look at all
// those header files anyway.
if (!(*MI)->IsInferred || (*MI)->IsFramework)
(*MI)->print(OS, Indent + 2);
for (unsigned I = 0, N = Exports.size(); I != N; ++I) {
OS.indent(Indent + 2);
OS << "export ";
if (Module *Restriction = Exports[I].getPointer()) {
OS << Restriction->getFullModuleName();
if (Exports[I].getInt())
OS << ".*";
} else {
OS << "*";
}
OS << "\n";
}
for (unsigned I = 0, N = UnresolvedExports.size(); I != N; ++I) {
OS.indent(Indent + 2);
OS << "export ";
printModuleId(OS, UnresolvedExports[I].Id);
if (UnresolvedExports[I].Wildcard) {
if (UnresolvedExports[I].Id.empty())
OS << "*";
else
OS << ".*";
}
OS << "\n";
}
for (unsigned I = 0, N = DirectUses.size(); I != N; ++I) {
OS.indent(Indent + 2);
OS << "use ";
OS << DirectUses[I]->getFullModuleName();
OS << "\n";
}
for (unsigned I = 0, N = UnresolvedDirectUses.size(); I != N; ++I) {
OS.indent(Indent + 2);
OS << "use ";
printModuleId(OS, UnresolvedDirectUses[I]);
OS << "\n";
}
for (unsigned I = 0, N = LinkLibraries.size(); I != N; ++I) {
OS.indent(Indent + 2);
OS << "link ";
if (LinkLibraries[I].IsFramework)
OS << "framework ";
OS << "\"";
OS.write_escaped(LinkLibraries[I].Library);
OS << "\"";
}
for (unsigned I = 0, N = UnresolvedConflicts.size(); I != N; ++I) {
OS.indent(Indent + 2);
OS << "conflict ";
printModuleId(OS, UnresolvedConflicts[I].Id);
OS << ", \"";
OS.write_escaped(UnresolvedConflicts[I].Message);
OS << "\"\n";
}
for (unsigned I = 0, N = Conflicts.size(); I != N; ++I) {
OS.indent(Indent + 2);
OS << "conflict ";
OS << Conflicts[I].Other->getFullModuleName();
OS << ", \"";
OS.write_escaped(Conflicts[I].Message);
OS << "\"\n";
}
if (InferSubmodules) {
OS.indent(Indent + 2);
if (InferExplicitSubmodules)
OS << "explicit ";
OS << "module * {\n";
if (InferExportWildcard) {
OS.indent(Indent + 4);
OS << "export *\n";
}
OS.indent(Indent + 2);
OS << "}\n";
}
OS.indent(Indent);
OS << "}\n";
}
void Module::dump() const {
print(llvm::errs());
}
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