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llvm-project/clang/lib/Lex/HeaderSearch.cpp

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//===- HeaderSearch.cpp - Resolve Header File Locations -------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements the DirectoryLookup and HeaderSearch interfaces.
//
//===----------------------------------------------------------------------===//
#include "clang/Lex/HeaderSearch.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/Module.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Lex/DirectoryLookup.h"
#include "clang/Lex/ExternalPreprocessorSource.h"
#include "clang/Lex/HeaderMap.h"
#include "clang/Lex/HeaderSearchOptions.h"
#include "clang/Lex/LexDiagnostic.h"
#include "clang/Lex/ModuleMap.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/Hashing.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/Capacity.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/VirtualFileSystem.h"
#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstdio>
#include <cstring>
#include <string>
#include <system_error>
#include <utility>
using namespace clang;
#define DEBUG_TYPE "file-search"
ALWAYS_ENABLED_STATISTIC(NumIncluded, "Number of attempted #includes.");
ALWAYS_ENABLED_STATISTIC(
NumMultiIncludeFileOptzn,
"Number of #includes skipped due to the multi-include optimization.");
ALWAYS_ENABLED_STATISTIC(NumFrameworkLookups, "Number of framework lookups.");
ALWAYS_ENABLED_STATISTIC(NumSubFrameworkLookups,
"Number of subframework lookups.");
const IdentifierInfo *
HeaderFileInfo::getControllingMacro(ExternalPreprocessorSource *External) {
if (ControllingMacro) {
if (ControllingMacro->isOutOfDate()) {
assert(External && "We must have an external source if we have a "
"controlling macro that is out of date.");
External->updateOutOfDateIdentifier(
*const_cast<IdentifierInfo *>(ControllingMacro));
}
return ControllingMacro;
}
if (!ControllingMacroID || !External)
return nullptr;
ControllingMacro = External->GetIdentifier(ControllingMacroID);
return ControllingMacro;
}
ExternalHeaderFileInfoSource::~ExternalHeaderFileInfoSource() = default;
HeaderSearch::HeaderSearch(std::shared_ptr<HeaderSearchOptions> HSOpts,
SourceManager &SourceMgr, DiagnosticsEngine &Diags,
const LangOptions &LangOpts,
const TargetInfo *Target)
: HSOpts(std::move(HSOpts)), Diags(Diags),
FileMgr(SourceMgr.getFileManager()), FrameworkMap(64),
ModMap(SourceMgr, Diags, LangOpts, Target, *this) {}
void HeaderSearch::PrintStats() {
llvm::errs() << "\n*** HeaderSearch Stats:\n"
<< FileInfo.size() << " files tracked.\n";
unsigned NumOnceOnlyFiles = 0, MaxNumIncludes = 0, NumSingleIncludedFiles = 0;
for (unsigned i = 0, e = FileInfo.size(); i != e; ++i) {
NumOnceOnlyFiles += FileInfo[i].isImport;
if (MaxNumIncludes < FileInfo[i].NumIncludes)
MaxNumIncludes = FileInfo[i].NumIncludes;
NumSingleIncludedFiles += FileInfo[i].NumIncludes == 1;
}
llvm::errs() << " " << NumOnceOnlyFiles << " #import/#pragma once files.\n"
<< " " << NumSingleIncludedFiles << " included exactly once.\n"
<< " " << MaxNumIncludes << " max times a file is included.\n";
llvm::errs() << " " << NumIncluded << " #include/#include_next/#import.\n"
<< " " << NumMultiIncludeFileOptzn
<< " #includes skipped due to the multi-include optimization.\n";
llvm::errs() << NumFrameworkLookups << " framework lookups.\n"
<< NumSubFrameworkLookups << " subframework lookups.\n";
}
/// CreateHeaderMap - This method returns a HeaderMap for the specified
/// FileEntry, uniquing them through the 'HeaderMaps' datastructure.
const HeaderMap *HeaderSearch::CreateHeaderMap(const FileEntry *FE) {
// We expect the number of headermaps to be small, and almost always empty.
// If it ever grows, use of a linear search should be re-evaluated.
if (!HeaderMaps.empty()) {
for (unsigned i = 0, e = HeaderMaps.size(); i != e; ++i)
// Pointer equality comparison of FileEntries works because they are
// already uniqued by inode.
if (HeaderMaps[i].first == FE)
return HeaderMaps[i].second.get();
}
if (std::unique_ptr<HeaderMap> HM = HeaderMap::Create(FE, FileMgr)) {
HeaderMaps.emplace_back(FE, std::move(HM));
return HeaderMaps.back().second.get();
}
return nullptr;
}
/// Get filenames for all registered header maps.
void HeaderSearch::getHeaderMapFileNames(
SmallVectorImpl<std::string> &Names) const {
for (auto &HM : HeaderMaps)
Names.push_back(std::string(HM.first->getName()));
}
std::string HeaderSearch::getCachedModuleFileName(Module *Module) {
const FileEntry *ModuleMap =
getModuleMap().getModuleMapFileForUniquing(Module);
return getCachedModuleFileName(Module->Name, ModuleMap->getName());
}
std::string HeaderSearch::getPrebuiltModuleFileName(StringRef ModuleName,
bool FileMapOnly) {
// First check the module name to pcm file map.
auto i(HSOpts->PrebuiltModuleFiles.find(ModuleName));
if (i != HSOpts->PrebuiltModuleFiles.end())
return i->second;
if (FileMapOnly || HSOpts->PrebuiltModulePaths.empty())
return {};
// Then go through each prebuilt module directory and try to find the pcm
// file.
for (const std::string &Dir : HSOpts->PrebuiltModulePaths) {
SmallString<256> Result(Dir);
llvm::sys::fs::make_absolute(Result);
llvm::sys::path::append(Result, ModuleName + ".pcm");
if (getFileMgr().getFile(Result.str()))
return std::string(Result);
}
return {};
}
std::string HeaderSearch::getPrebuiltImplicitModuleFileName(Module *Module) {
const FileEntry *ModuleMap =
getModuleMap().getModuleMapFileForUniquing(Module);
StringRef ModuleName = Module->Name;
StringRef ModuleMapPath = ModuleMap->getName();
StringRef ModuleCacheHash = HSOpts->DisableModuleHash ? "" : getModuleHash();
for (const std::string &Dir : HSOpts->PrebuiltModulePaths) {
SmallString<256> CachePath(Dir);
llvm::sys::fs::make_absolute(CachePath);
llvm::sys::path::append(CachePath, ModuleCacheHash);
std::string FileName =
getCachedModuleFileNameImpl(ModuleName, ModuleMapPath, CachePath);
if (!FileName.empty() && getFileMgr().getFile(FileName))
return FileName;
}
return {};
}
std::string HeaderSearch::getCachedModuleFileName(StringRef ModuleName,
StringRef ModuleMapPath) {
return getCachedModuleFileNameImpl(ModuleName, ModuleMapPath,
getModuleCachePath());
}
std::string HeaderSearch::getCachedModuleFileNameImpl(StringRef ModuleName,
StringRef ModuleMapPath,
StringRef CachePath) {
// If we don't have a module cache path or aren't supposed to use one, we
// can't do anything.
if (CachePath.empty())
return {};
SmallString<256> Result(CachePath);
llvm::sys::fs::make_absolute(Result);
if (HSOpts->DisableModuleHash) {
llvm::sys::path::append(Result, ModuleName + ".pcm");
} else {
// Construct the name <ModuleName>-<hash of ModuleMapPath>.pcm which should
// ideally be globally unique to this particular module. Name collisions
// in the hash are safe (because any translation unit can only import one
// module with each name), but result in a loss of caching.
//
// To avoid false-negatives, we form as canonical a path as we can, and map
// to lower-case in case we're on a case-insensitive file system.
std::string Parent =
std::string(llvm::sys::path::parent_path(ModuleMapPath));
if (Parent.empty())
Parent = ".";
auto Dir = FileMgr.getDirectory(Parent);
if (!Dir)
return {};
auto DirName = FileMgr.getCanonicalName(*Dir);
auto FileName = llvm::sys::path::filename(ModuleMapPath);
llvm::hash_code Hash =
llvm::hash_combine(DirName.lower(), FileName.lower());
SmallString<128> HashStr;
llvm::APInt(64, size_t(Hash)).toStringUnsigned(HashStr, /*Radix*/36);
llvm::sys::path::append(Result, ModuleName + "-" + HashStr + ".pcm");
}
return Result.str().str();
}
Module *HeaderSearch::lookupModule(StringRef ModuleName, bool AllowSearch,
bool AllowExtraModuleMapSearch) {
// Look in the module map to determine if there is a module by this name.
Module *Module = ModMap.findModule(ModuleName);
if (Module || !AllowSearch || !HSOpts->ImplicitModuleMaps)
return Module;
StringRef SearchName = ModuleName;
Module = lookupModule(ModuleName, SearchName, AllowExtraModuleMapSearch);
// The facility for "private modules" -- adjacent, optional module maps named
// module.private.modulemap that are supposed to define private submodules --
// may have different flavors of names: FooPrivate, Foo_Private and Foo.Private.
//
// Foo.Private is now deprecated in favor of Foo_Private. Users of FooPrivate
// should also rename to Foo_Private. Representing private as submodules
// could force building unwanted dependencies into the parent module and cause
// dependency cycles.
if (!Module && SearchName.consume_back("_Private"))
Module = lookupModule(ModuleName, SearchName, AllowExtraModuleMapSearch);
if (!Module && SearchName.consume_back("Private"))
Module = lookupModule(ModuleName, SearchName, AllowExtraModuleMapSearch);
return Module;
}
Module *HeaderSearch::lookupModule(StringRef ModuleName, StringRef SearchName,
bool AllowExtraModuleMapSearch) {
Module *Module = nullptr;
// Look through the various header search paths to load any available module
// maps, searching for a module map that describes this module.
for (unsigned Idx = 0, N = SearchDirs.size(); Idx != N; ++Idx) {
if (SearchDirs[Idx].isFramework()) {
// Search for or infer a module map for a framework. Here we use
// SearchName rather than ModuleName, to permit finding private modules
// named FooPrivate in buggy frameworks named Foo.
SmallString<128> FrameworkDirName;
FrameworkDirName += SearchDirs[Idx].getFrameworkDir()->getName();
llvm::sys::path::append(FrameworkDirName, SearchName + ".framework");
if (auto FrameworkDir = FileMgr.getDirectory(FrameworkDirName)) {
bool IsSystem
= SearchDirs[Idx].getDirCharacteristic() != SrcMgr::C_User;
Module = loadFrameworkModule(ModuleName, *FrameworkDir, IsSystem);
if (Module)
break;
}
}
// FIXME: Figure out how header maps and module maps will work together.
// Only deal with normal search directories.
if (!SearchDirs[Idx].isNormalDir())
continue;
bool IsSystem = SearchDirs[Idx].isSystemHeaderDirectory();
// Search for a module map file in this directory.
if (loadModuleMapFile(SearchDirs[Idx].getDir(), IsSystem,
/*IsFramework*/false) == LMM_NewlyLoaded) {
// We just loaded a module map file; check whether the module is
// available now.
Module = ModMap.findModule(ModuleName);
if (Module)
break;
}
// Search for a module map in a subdirectory with the same name as the
// module.
SmallString<128> NestedModuleMapDirName;
NestedModuleMapDirName = SearchDirs[Idx].getDir()->getName();
llvm::sys::path::append(NestedModuleMapDirName, ModuleName);
if (loadModuleMapFile(NestedModuleMapDirName, IsSystem,
/*IsFramework*/false) == LMM_NewlyLoaded){
// If we just loaded a module map file, look for the module again.
Module = ModMap.findModule(ModuleName);
if (Module)
break;
}
// If we've already performed the exhaustive search for module maps in this
// search directory, don't do it again.
if (SearchDirs[Idx].haveSearchedAllModuleMaps())
continue;
// Load all module maps in the immediate subdirectories of this search
// directory if ModuleName was from @import.
if (AllowExtraModuleMapSearch)
loadSubdirectoryModuleMaps(SearchDirs[Idx]);
// Look again for the module.
Module = ModMap.findModule(ModuleName);
if (Module)
break;
}
return Module;
}
//===----------------------------------------------------------------------===//
// File lookup within a DirectoryLookup scope
//===----------------------------------------------------------------------===//
/// getName - Return the directory or filename corresponding to this lookup
/// object.
StringRef DirectoryLookup::getName() const {
// FIXME: Use the name from \c DirectoryEntryRef.
if (isNormalDir())
return getDir()->getName();
if (isFramework())
return getFrameworkDir()->getName();
assert(isHeaderMap() && "Unknown DirectoryLookup");
return getHeaderMap()->getFileName();
}
Optional<FileEntryRef> HeaderSearch::getFileAndSuggestModule(
StringRef FileName, SourceLocation IncludeLoc, const DirectoryEntry *Dir,
bool IsSystemHeaderDir, Module *RequestingModule,
ModuleMap::KnownHeader *SuggestedModule) {
// If we have a module map that might map this header, load it and
// check whether we'll have a suggestion for a module.
auto File = getFileMgr().getFileRef(FileName, /*OpenFile=*/true);
if (!File) {
// For rare, surprising errors (e.g. "out of file handles"), diag the EC
// message.
std::error_code EC = llvm::errorToErrorCode(File.takeError());
if (EC != llvm::errc::no_such_file_or_directory &&
EC != llvm::errc::invalid_argument &&
EC != llvm::errc::is_a_directory && EC != llvm::errc::not_a_directory) {
Diags.Report(IncludeLoc, diag::err_cannot_open_file)
<< FileName << EC.message();
}
return None;
}
// If there is a module that corresponds to this header, suggest it.
if (!findUsableModuleForHeader(
&File->getFileEntry(), Dir ? Dir : File->getFileEntry().getDir(),
RequestingModule, SuggestedModule, IsSystemHeaderDir))
return None;
return *File;
}
/// LookupFile - Lookup the specified file in this search path, returning it
/// if it exists or returning null if not.
Optional<FileEntryRef> DirectoryLookup::LookupFile(
StringRef &Filename, HeaderSearch &HS, SourceLocation IncludeLoc,
SmallVectorImpl<char> *SearchPath, SmallVectorImpl<char> *RelativePath,
Module *RequestingModule, ModuleMap::KnownHeader *SuggestedModule,
bool &InUserSpecifiedSystemFramework, bool &IsFrameworkFound,
bool &IsInHeaderMap, SmallVectorImpl<char> &MappedName) const {
InUserSpecifiedSystemFramework = false;
IsInHeaderMap = false;
MappedName.clear();
SmallString<1024> TmpDir;
if (isNormalDir()) {
// Concatenate the requested file onto the directory.
TmpDir = getDir()->getName();
llvm::sys::path::append(TmpDir, Filename);
if (SearchPath) {
StringRef SearchPathRef(getDir()->getName());
SearchPath->clear();
SearchPath->append(SearchPathRef.begin(), SearchPathRef.end());
}
if (RelativePath) {
RelativePath->clear();
RelativePath->append(Filename.begin(), Filename.end());
}
return HS.getFileAndSuggestModule(TmpDir, IncludeLoc, getDir(),
isSystemHeaderDirectory(),
RequestingModule, SuggestedModule);
}
if (isFramework())
return DoFrameworkLookup(Filename, HS, SearchPath, RelativePath,
RequestingModule, SuggestedModule,
InUserSpecifiedSystemFramework, IsFrameworkFound);
assert(isHeaderMap() && "Unknown directory lookup");
const HeaderMap *HM = getHeaderMap();
SmallString<1024> Path;
StringRef Dest = HM->lookupFilename(Filename, Path);
if (Dest.empty())
return None;
IsInHeaderMap = true;
auto FixupSearchPath = [&]() {
if (SearchPath) {
StringRef SearchPathRef(getName());
SearchPath->clear();
SearchPath->append(SearchPathRef.begin(), SearchPathRef.end());
}
if (RelativePath) {
RelativePath->clear();
RelativePath->append(Filename.begin(), Filename.end());
}
};
// Check if the headermap maps the filename to a framework include
// ("Foo.h" -> "Foo/Foo.h"), in which case continue header lookup using the
// framework include.
if (llvm::sys::path::is_relative(Dest)) {
MappedName.append(Dest.begin(), Dest.end());
Filename = StringRef(MappedName.begin(), MappedName.size());
Optional<FileEntryRef> Result = HM->LookupFile(Filename, HS.getFileMgr());
if (Result) {
FixupSearchPath();
return *Result;
}
} else if (auto Res = HS.getFileMgr().getOptionalFileRef(Dest)) {
FixupSearchPath();
return *Res;
}
return None;
}
/// Given a framework directory, find the top-most framework directory.
///
/// \param FileMgr The file manager to use for directory lookups.
/// \param DirName The name of the framework directory.
/// \param SubmodulePath Will be populated with the submodule path from the
/// returned top-level module to the originally named framework.
static const DirectoryEntry *
getTopFrameworkDir(FileManager &FileMgr, StringRef DirName,
SmallVectorImpl<std::string> &SubmodulePath) {
assert(llvm::sys::path::extension(DirName) == ".framework" &&
"Not a framework directory");
// Note: as an egregious but useful hack we use the real path here, because
// frameworks moving between top-level frameworks to embedded frameworks tend
// to be symlinked, and we base the logical structure of modules on the
// physical layout. In particular, we need to deal with crazy includes like
//
// #include <Foo/Frameworks/Bar.framework/Headers/Wibble.h>
//
// where 'Bar' used to be embedded in 'Foo', is now a top-level framework
// which one should access with, e.g.,
//
// #include <Bar/Wibble.h>
//
// Similar issues occur when a top-level framework has moved into an
// embedded framework.
const DirectoryEntry *TopFrameworkDir = nullptr;
if (auto TopFrameworkDirOrErr = FileMgr.getDirectory(DirName))
TopFrameworkDir = *TopFrameworkDirOrErr;
if (TopFrameworkDir)
DirName = FileMgr.getCanonicalName(TopFrameworkDir);
do {
// Get the parent directory name.
DirName = llvm::sys::path::parent_path(DirName);
if (DirName.empty())
break;
// Determine whether this directory exists.
auto Dir = FileMgr.getDirectory(DirName);
if (!Dir)
break;
// If this is a framework directory, then we're a subframework of this
// framework.
if (llvm::sys::path::extension(DirName) == ".framework") {
SubmodulePath.push_back(std::string(llvm::sys::path::stem(DirName)));
TopFrameworkDir = *Dir;
}
} while (true);
return TopFrameworkDir;
}
static bool needModuleLookup(Module *RequestingModule,
bool HasSuggestedModule) {
return HasSuggestedModule ||
(RequestingModule && RequestingModule->NoUndeclaredIncludes);
}
/// DoFrameworkLookup - Do a lookup of the specified file in the current
/// DirectoryLookup, which is a framework directory.
Optional<FileEntryRef> DirectoryLookup::DoFrameworkLookup(
StringRef Filename, HeaderSearch &HS, SmallVectorImpl<char> *SearchPath,
SmallVectorImpl<char> *RelativePath, Module *RequestingModule,
ModuleMap::KnownHeader *SuggestedModule,
bool &InUserSpecifiedSystemFramework, bool &IsFrameworkFound) const {
FileManager &FileMgr = HS.getFileMgr();
// Framework names must have a '/' in the filename.
size_t SlashPos = Filename.find('/');
if (SlashPos == StringRef::npos)
return None;
// Find out if this is the home for the specified framework, by checking
// HeaderSearch. Possible answers are yes/no and unknown.
FrameworkCacheEntry &CacheEntry =
HS.LookupFrameworkCache(Filename.substr(0, SlashPos));
// If it is known and in some other directory, fail.
if (CacheEntry.Directory && CacheEntry.Directory != getFrameworkDir())
return None;
// Otherwise, construct the path to this framework dir.
// FrameworkName = "/System/Library/Frameworks/"
SmallString<1024> FrameworkName;
FrameworkName += getFrameworkDirRef()->getName();
if (FrameworkName.empty() || FrameworkName.back() != '/')
FrameworkName.push_back('/');
// FrameworkName = "/System/Library/Frameworks/Cocoa"
StringRef ModuleName(Filename.begin(), SlashPos);
FrameworkName += ModuleName;
// FrameworkName = "/System/Library/Frameworks/Cocoa.framework/"
FrameworkName += ".framework/";
// If the cache entry was unresolved, populate it now.
if (!CacheEntry.Directory) {
++NumFrameworkLookups;
// If the framework dir doesn't exist, we fail.
auto Dir = FileMgr.getDirectory(FrameworkName);
if (!Dir)
return None;
// Otherwise, if it does, remember that this is the right direntry for this
// framework.
CacheEntry.Directory = getFrameworkDir();
// If this is a user search directory, check if the framework has been
// user-specified as a system framework.
if (getDirCharacteristic() == SrcMgr::C_User) {
SmallString<1024> SystemFrameworkMarker(FrameworkName);
SystemFrameworkMarker += ".system_framework";
if (llvm::sys::fs::exists(SystemFrameworkMarker)) {
CacheEntry.IsUserSpecifiedSystemFramework = true;
}
}
}
// Set out flags.
InUserSpecifiedSystemFramework = CacheEntry.IsUserSpecifiedSystemFramework;
IsFrameworkFound = CacheEntry.Directory;
if (RelativePath) {
RelativePath->clear();
RelativePath->append(Filename.begin()+SlashPos+1, Filename.end());
}
// Check "/System/Library/Frameworks/Cocoa.framework/Headers/file.h"
unsigned OrigSize = FrameworkName.size();
FrameworkName += "Headers/";
if (SearchPath) {
SearchPath->clear();
// Without trailing '/'.
SearchPath->append(FrameworkName.begin(), FrameworkName.end()-1);
}
FrameworkName.append(Filename.begin()+SlashPos+1, Filename.end());
auto File =
FileMgr.getOptionalFileRef(FrameworkName, /*OpenFile=*/!SuggestedModule);
if (!File) {
// Check "/System/Library/Frameworks/Cocoa.framework/PrivateHeaders/file.h"
const char *Private = "Private";
FrameworkName.insert(FrameworkName.begin()+OrigSize, Private,
Private+strlen(Private));
if (SearchPath)
SearchPath->insert(SearchPath->begin()+OrigSize, Private,
Private+strlen(Private));
File = FileMgr.getOptionalFileRef(FrameworkName,
/*OpenFile=*/!SuggestedModule);
}
// If we found the header and are allowed to suggest a module, do so now.
if (File && needModuleLookup(RequestingModule, SuggestedModule)) {
// Find the framework in which this header occurs.
StringRef FrameworkPath = File->getFileEntry().getDir()->getName();
bool FoundFramework = false;
do {
// Determine whether this directory exists.
auto Dir = FileMgr.getDirectory(FrameworkPath);
if (!Dir)
break;
// If this is a framework directory, then we're a subframework of this
// framework.
if (llvm::sys::path::extension(FrameworkPath) == ".framework") {
FoundFramework = true;
break;
}
// Get the parent directory name.
FrameworkPath = llvm::sys::path::parent_path(FrameworkPath);
if (FrameworkPath.empty())
break;
} while (true);
bool IsSystem = getDirCharacteristic() != SrcMgr::C_User;
if (FoundFramework) {
if (!HS.findUsableModuleForFrameworkHeader(
&File->getFileEntry(), FrameworkPath, RequestingModule,
SuggestedModule, IsSystem))
return None;
} else {
if (!HS.findUsableModuleForHeader(&File->getFileEntry(), getDir(),
RequestingModule, SuggestedModule,
IsSystem))
return None;
}
}
if (File)
return *File;
return None;
}
void HeaderSearch::setTarget(const TargetInfo &Target) {
ModMap.setTarget(Target);
}
//===----------------------------------------------------------------------===//
// Header File Location.
//===----------------------------------------------------------------------===//
/// Return true with a diagnostic if the file that MSVC would have found
/// fails to match the one that Clang would have found with MSVC header search
/// disabled.
static bool checkMSVCHeaderSearch(DiagnosticsEngine &Diags,
const FileEntry *MSFE, const FileEntry *FE,
SourceLocation IncludeLoc) {
if (MSFE && FE != MSFE) {
Diags.Report(IncludeLoc, diag::ext_pp_include_search_ms) << MSFE->getName();
return true;
}
return false;
}
static const char *copyString(StringRef Str, llvm::BumpPtrAllocator &Alloc) {
assert(!Str.empty());
char *CopyStr = Alloc.Allocate<char>(Str.size()+1);
std::copy(Str.begin(), Str.end(), CopyStr);
CopyStr[Str.size()] = '\0';
return CopyStr;
}
static bool isFrameworkStylePath(StringRef Path, bool &IsPrivateHeader,
SmallVectorImpl<char> &FrameworkName) {
using namespace llvm::sys;
path::const_iterator I = path::begin(Path);
path::const_iterator E = path::end(Path);
IsPrivateHeader = false;
// Detect different types of framework style paths:
//
// ...Foo.framework/{Headers,PrivateHeaders}
// ...Foo.framework/Versions/{A,Current}/{Headers,PrivateHeaders}
// ...Foo.framework/Frameworks/Nested.framework/{Headers,PrivateHeaders}
// ...<other variations with 'Versions' like in the above path>
//
// and some other variations among these lines.
int FoundComp = 0;
while (I != E) {
if (*I == "Headers")
++FoundComp;
if (I->endswith(".framework")) {
FrameworkName.append(I->begin(), I->end());
++FoundComp;
}
if (*I == "PrivateHeaders") {
++FoundComp;
IsPrivateHeader = true;
}
++I;
}
return !FrameworkName.empty() && FoundComp >= 2;
}
static void
diagnoseFrameworkInclude(DiagnosticsEngine &Diags, SourceLocation IncludeLoc,
StringRef Includer, StringRef IncludeFilename,
const FileEntry *IncludeFE, bool isAngled = false,
bool FoundByHeaderMap = false) {
bool IsIncluderPrivateHeader = false;
SmallString<128> FromFramework, ToFramework;
if (!isFrameworkStylePath(Includer, IsIncluderPrivateHeader, FromFramework))
return;
bool IsIncludeePrivateHeader = false;
bool IsIncludeeInFramework = isFrameworkStylePath(
IncludeFE->getName(), IsIncludeePrivateHeader, ToFramework);
if (!isAngled && !FoundByHeaderMap) {
SmallString<128> NewInclude("<");
if (IsIncludeeInFramework) {
NewInclude += StringRef(ToFramework).drop_back(10); // drop .framework
NewInclude += "/";
}
NewInclude += IncludeFilename;
NewInclude += ">";
Diags.Report(IncludeLoc, diag::warn_quoted_include_in_framework_header)
<< IncludeFilename
<< FixItHint::CreateReplacement(IncludeLoc, NewInclude);
}
// Headers in Foo.framework/Headers should not include headers
// from Foo.framework/PrivateHeaders, since this violates public/private
// API boundaries and can cause modular dependency cycles.
if (!IsIncluderPrivateHeader && IsIncludeeInFramework &&
IsIncludeePrivateHeader && FromFramework == ToFramework)
Diags.Report(IncludeLoc, diag::warn_framework_include_private_from_public)
<< IncludeFilename;
}
/// LookupFile - Given a "foo" or \<foo> reference, look up the indicated file,
/// return null on failure. isAngled indicates whether the file reference is
/// for system \#include's or not (i.e. using <> instead of ""). Includers, if
/// non-empty, indicates where the \#including file(s) are, in case a relative
/// search is needed. Microsoft mode will pass all \#including files.
Optional<FileEntryRef> HeaderSearch::LookupFile(
StringRef Filename, SourceLocation IncludeLoc, bool isAngled,
const DirectoryLookup *FromDir, const DirectoryLookup *&CurDir,
ArrayRef<std::pair<const FileEntry *, const DirectoryEntry *>> Includers,
SmallVectorImpl<char> *SearchPath, SmallVectorImpl<char> *RelativePath,
Module *RequestingModule, ModuleMap::KnownHeader *SuggestedModule,
bool *IsMapped, bool *IsFrameworkFound, bool SkipCache,
bool BuildSystemModule) {
if (IsMapped)
*IsMapped = false;
if (IsFrameworkFound)
*IsFrameworkFound = false;
if (SuggestedModule)
*SuggestedModule = ModuleMap::KnownHeader();
// If 'Filename' is absolute, check to see if it exists and no searching.
if (llvm::sys::path::is_absolute(Filename)) {
CurDir = nullptr;
// If this was an #include_next "/absolute/file", fail.
if (FromDir)
return None;
if (SearchPath)
SearchPath->clear();
if (RelativePath) {
RelativePath->clear();
RelativePath->append(Filename.begin(), Filename.end());
}
// Otherwise, just return the file.
return getFileAndSuggestModule(Filename, IncludeLoc, nullptr,
/*IsSystemHeaderDir*/false,
RequestingModule, SuggestedModule);
}
// This is the header that MSVC's header search would have found.
ModuleMap::KnownHeader MSSuggestedModule;
Optional<FileEntryRef> MSFE;
// Unless disabled, check to see if the file is in the #includer's
// directory. This cannot be based on CurDir, because each includer could be
// a #include of a subdirectory (#include "foo/bar.h") and a subsequent
// include of "baz.h" should resolve to "whatever/foo/baz.h".
// This search is not done for <> headers.
if (!Includers.empty() && !isAngled && !NoCurDirSearch) {
SmallString<1024> TmpDir;
bool First = true;
for (const auto &IncluderAndDir : Includers) {
const FileEntry *Includer = IncluderAndDir.first;
// Concatenate the requested file onto the directory.
// FIXME: Portability. Filename concatenation should be in sys::Path.
TmpDir = IncluderAndDir.second->getName();
TmpDir.push_back('/');
TmpDir.append(Filename.begin(), Filename.end());
// FIXME: We don't cache the result of getFileInfo across the call to
// getFileAndSuggestModule, because it's a reference to an element of
// a container that could be reallocated across this call.
//
// If we have no includer, that means we're processing a #include
// from a module build. We should treat this as a system header if we're
// building a [system] module.
bool IncluderIsSystemHeader =
Includer ? getFileInfo(Includer).DirInfo != SrcMgr::C_User :
BuildSystemModule;
if (Optional<FileEntryRef> FE = getFileAndSuggestModule(
TmpDir, IncludeLoc, IncluderAndDir.second, IncluderIsSystemHeader,
RequestingModule, SuggestedModule)) {
if (!Includer) {
assert(First && "only first includer can have no file");
return FE;
}
// Leave CurDir unset.
// This file is a system header or C++ unfriendly if the old file is.
//
// Note that we only use one of FromHFI/ToHFI at once, due to potential
// reallocation of the underlying vector potentially making the first
// reference binding dangling.
HeaderFileInfo &FromHFI = getFileInfo(Includer);
unsigned DirInfo = FromHFI.DirInfo;
bool IndexHeaderMapHeader = FromHFI.IndexHeaderMapHeader;
StringRef Framework = FromHFI.Framework;
HeaderFileInfo &ToHFI = getFileInfo(&FE->getFileEntry());
ToHFI.DirInfo = DirInfo;
ToHFI.IndexHeaderMapHeader = IndexHeaderMapHeader;
ToHFI.Framework = Framework;
if (SearchPath) {
StringRef SearchPathRef(IncluderAndDir.second->getName());
SearchPath->clear();
SearchPath->append(SearchPathRef.begin(), SearchPathRef.end());
}
if (RelativePath) {
RelativePath->clear();
RelativePath->append(Filename.begin(), Filename.end());
}
if (First) {
diagnoseFrameworkInclude(Diags, IncludeLoc,
IncluderAndDir.second->getName(), Filename,
&FE->getFileEntry());
return FE;
}
// Otherwise, we found the path via MSVC header search rules. If
// -Wmsvc-include is enabled, we have to keep searching to see if we
// would've found this header in -I or -isystem directories.
if (Diags.isIgnored(diag::ext_pp_include_search_ms, IncludeLoc)) {
return FE;
} else {
MSFE = FE;
if (SuggestedModule) {
MSSuggestedModule = *SuggestedModule;
*SuggestedModule = ModuleMap::KnownHeader();
}
break;
}
}
First = false;
}
}
CurDir = nullptr;
// If this is a system #include, ignore the user #include locs.
unsigned i = isAngled ? AngledDirIdx : 0;
// If this is a #include_next request, start searching after the directory the
// file was found in.
if (FromDir)
i = FromDir-&SearchDirs[0];
// Cache all of the lookups performed by this method. Many headers are
// multiply included, and the "pragma once" optimization prevents them from
// being relex/pp'd, but they would still have to search through a
// (potentially huge) series of SearchDirs to find it.
LookupFileCacheInfo &CacheLookup = LookupFileCache[Filename];
// If the entry has been previously looked up, the first value will be
// non-zero. If the value is equal to i (the start point of our search), then
// this is a matching hit.
if (!SkipCache && CacheLookup.StartIdx == i+1) {
// Skip querying potentially lots of directories for this lookup.
i = CacheLookup.HitIdx;
if (CacheLookup.MappedName) {
Filename = CacheLookup.MappedName;
if (IsMapped)
*IsMapped = true;
}
} else {
// Otherwise, this is the first query, or the previous query didn't match
// our search start. We will fill in our found location below, so prime the
// start point value.
CacheLookup.reset(/*StartIdx=*/i+1);
}
SmallString<64> MappedName;
// Check each directory in sequence to see if it contains this file.
for (; i != SearchDirs.size(); ++i) {
bool InUserSpecifiedSystemFramework = false;
bool IsInHeaderMap = false;
bool IsFrameworkFoundInDir = false;
Optional<FileEntryRef> File = SearchDirs[i].LookupFile(
Filename, *this, IncludeLoc, SearchPath, RelativePath, RequestingModule,
SuggestedModule, InUserSpecifiedSystemFramework, IsFrameworkFoundInDir,
IsInHeaderMap, MappedName);
if (!MappedName.empty()) {
assert(IsInHeaderMap && "MappedName should come from a header map");
CacheLookup.MappedName =
copyString(MappedName, LookupFileCache.getAllocator());
}
if (IsMapped)
// A filename is mapped when a header map remapped it to a relative path
// used in subsequent header search or to an absolute path pointing to an
// existing file.
*IsMapped |= (!MappedName.empty() || (IsInHeaderMap && File));
if (IsFrameworkFound)
// Because we keep a filename remapped for subsequent search directory
// lookups, ignore IsFrameworkFoundInDir after the first remapping and not
// just for remapping in a current search directory.
*IsFrameworkFound |= (IsFrameworkFoundInDir && !CacheLookup.MappedName);
if (!File)
continue;
CurDir = &SearchDirs[i];
// This file is a system header or C++ unfriendly if the dir is.
HeaderFileInfo &HFI = getFileInfo(&File->getFileEntry());
HFI.DirInfo = CurDir->getDirCharacteristic();
// If the directory characteristic is User but this framework was
// user-specified to be treated as a system framework, promote the
// characteristic.
if (HFI.DirInfo == SrcMgr::C_User && InUserSpecifiedSystemFramework)
HFI.DirInfo = SrcMgr::C_System;
// If the filename matches a known system header prefix, override
// whether the file is a system header.
for (unsigned j = SystemHeaderPrefixes.size(); j; --j) {
if (Filename.startswith(SystemHeaderPrefixes[j-1].first)) {
HFI.DirInfo = SystemHeaderPrefixes[j-1].second ? SrcMgr::C_System
: SrcMgr::C_User;
break;
}
}
// If this file is found in a header map and uses the framework style of
// includes, then this header is part of a framework we're building.
if (CurDir->isIndexHeaderMap()) {
size_t SlashPos = Filename.find('/');
if (SlashPos != StringRef::npos) {
HFI.IndexHeaderMapHeader = 1;
HFI.Framework = getUniqueFrameworkName(StringRef(Filename.begin(),
SlashPos));
}
}
if (checkMSVCHeaderSearch(Diags, MSFE ? &MSFE->getFileEntry() : nullptr,
&File->getFileEntry(), IncludeLoc)) {
if (SuggestedModule)
*SuggestedModule = MSSuggestedModule;
return MSFE;
}
bool FoundByHeaderMap = !IsMapped ? false : *IsMapped;
if (!Includers.empty())
diagnoseFrameworkInclude(
Diags, IncludeLoc, Includers.front().second->getName(), Filename,
&File->getFileEntry(), isAngled, FoundByHeaderMap);
// Remember this location for the next lookup we do.
CacheLookup.HitIdx = i;
return File;
}
// If we are including a file with a quoted include "foo.h" from inside
// a header in a framework that is currently being built, and we couldn't
// resolve "foo.h" any other way, change the include to <Foo/foo.h>, where
// "Foo" is the name of the framework in which the including header was found.
if (!Includers.empty() && Includers.front().first && !isAngled &&
Filename.find('/') == StringRef::npos) {
HeaderFileInfo &IncludingHFI = getFileInfo(Includers.front().first);
if (IncludingHFI.IndexHeaderMapHeader) {
SmallString<128> ScratchFilename;
ScratchFilename += IncludingHFI.Framework;
ScratchFilename += '/';
ScratchFilename += Filename;
Optional<FileEntryRef> File = LookupFile(
ScratchFilename, IncludeLoc, /*isAngled=*/true, FromDir, CurDir,
Includers.front(), SearchPath, RelativePath, RequestingModule,
SuggestedModule, IsMapped, /*IsFrameworkFound=*/nullptr);
if (checkMSVCHeaderSearch(Diags, MSFE ? &MSFE->getFileEntry() : nullptr,
File ? &File->getFileEntry() : nullptr,
IncludeLoc)) {
if (SuggestedModule)
*SuggestedModule = MSSuggestedModule;
return MSFE;
}
LookupFileCacheInfo &CacheLookup = LookupFileCache[Filename];
CacheLookup.HitIdx = LookupFileCache[ScratchFilename].HitIdx;
// FIXME: SuggestedModule.
return File;
}
}
if (checkMSVCHeaderSearch(Diags, MSFE ? &MSFE->getFileEntry() : nullptr,
nullptr, IncludeLoc)) {
if (SuggestedModule)
*SuggestedModule = MSSuggestedModule;
return MSFE;
}
// Otherwise, didn't find it. Remember we didn't find this.
CacheLookup.HitIdx = SearchDirs.size();
return None;
}
/// LookupSubframeworkHeader - Look up a subframework for the specified
/// \#include file. For example, if \#include'ing <HIToolbox/HIToolbox.h> from
/// within ".../Carbon.framework/Headers/Carbon.h", check to see if HIToolbox
/// is a subframework within Carbon.framework. If so, return the FileEntry
/// for the designated file, otherwise return null.
Optional<FileEntryRef> HeaderSearch::LookupSubframeworkHeader(
StringRef Filename, const FileEntry *ContextFileEnt,
SmallVectorImpl<char> *SearchPath, SmallVectorImpl<char> *RelativePath,
Module *RequestingModule, ModuleMap::KnownHeader *SuggestedModule) {
assert(ContextFileEnt && "No context file?");
// Framework names must have a '/' in the filename. Find it.
// FIXME: Should we permit '\' on Windows?
size_t SlashPos = Filename.find('/');
if (SlashPos == StringRef::npos)
return None;
// Look up the base framework name of the ContextFileEnt.
StringRef ContextName = ContextFileEnt->getName();
// If the context info wasn't a framework, couldn't be a subframework.
const unsigned DotFrameworkLen = 10;
auto FrameworkPos = ContextName.find(".framework");
if (FrameworkPos == StringRef::npos ||
(ContextName[FrameworkPos + DotFrameworkLen] != '/' &&
ContextName[FrameworkPos + DotFrameworkLen] != '\\'))
return None;
SmallString<1024> FrameworkName(ContextName.data(), ContextName.data() +
FrameworkPos +
DotFrameworkLen + 1);
// Append Frameworks/HIToolbox.framework/
FrameworkName += "Frameworks/";
FrameworkName.append(Filename.begin(), Filename.begin()+SlashPos);
FrameworkName += ".framework/";
auto &CacheLookup =
*FrameworkMap.insert(std::make_pair(Filename.substr(0, SlashPos),
FrameworkCacheEntry())).first;
// Some other location?
if (CacheLookup.second.Directory &&
CacheLookup.first().size() == FrameworkName.size() &&
memcmp(CacheLookup.first().data(), &FrameworkName[0],
CacheLookup.first().size()) != 0)
return None;
// Cache subframework.
if (!CacheLookup.second.Directory) {
++NumSubFrameworkLookups;
// If the framework dir doesn't exist, we fail.
auto Dir = FileMgr.getDirectory(FrameworkName);
if (!Dir)
return None;
// Otherwise, if it does, remember that this is the right direntry for this
// framework.
CacheLookup.second.Directory = *Dir;
}
if (RelativePath) {
RelativePath->clear();
RelativePath->append(Filename.begin()+SlashPos+1, Filename.end());
}
// Check ".../Frameworks/HIToolbox.framework/Headers/HIToolbox.h"
SmallString<1024> HeadersFilename(FrameworkName);
HeadersFilename += "Headers/";
if (SearchPath) {
SearchPath->clear();
// Without trailing '/'.
SearchPath->append(HeadersFilename.begin(), HeadersFilename.end()-1);
}
HeadersFilename.append(Filename.begin()+SlashPos+1, Filename.end());
auto File = FileMgr.getOptionalFileRef(HeadersFilename, /*OpenFile=*/true);
if (!File) {
// Check ".../Frameworks/HIToolbox.framework/PrivateHeaders/HIToolbox.h"
HeadersFilename = FrameworkName;
HeadersFilename += "PrivateHeaders/";
if (SearchPath) {
SearchPath->clear();
// Without trailing '/'.
SearchPath->append(HeadersFilename.begin(), HeadersFilename.end()-1);
}
HeadersFilename.append(Filename.begin()+SlashPos+1, Filename.end());
File = FileMgr.getOptionalFileRef(HeadersFilename, /*OpenFile=*/true);
if (!File)
return None;
}
// This file is a system header or C++ unfriendly if the old file is.
//
// Note that the temporary 'DirInfo' is required here, as either call to
// getFileInfo could resize the vector and we don't want to rely on order
// of evaluation.
unsigned DirInfo = getFileInfo(ContextFileEnt).DirInfo;
getFileInfo(&File->getFileEntry()).DirInfo = DirInfo;
FrameworkName.pop_back(); // remove the trailing '/'
if (!findUsableModuleForFrameworkHeader(&File->getFileEntry(), FrameworkName,
RequestingModule, SuggestedModule,
/*IsSystem*/ false))
return None;
return *File;
}
//===----------------------------------------------------------------------===//
// File Info Management.
//===----------------------------------------------------------------------===//
/// Merge the header file info provided by \p OtherHFI into the current
/// header file info (\p HFI)
static void mergeHeaderFileInfo(HeaderFileInfo &HFI,
const HeaderFileInfo &OtherHFI) {
assert(OtherHFI.External && "expected to merge external HFI");
HFI.isImport |= OtherHFI.isImport;
HFI.isPragmaOnce |= OtherHFI.isPragmaOnce;
HFI.isModuleHeader |= OtherHFI.isModuleHeader;
HFI.NumIncludes += OtherHFI.NumIncludes;
if (!HFI.ControllingMacro && !HFI.ControllingMacroID) {
HFI.ControllingMacro = OtherHFI.ControllingMacro;
HFI.ControllingMacroID = OtherHFI.ControllingMacroID;
}
HFI.DirInfo = OtherHFI.DirInfo;
HFI.External = (!HFI.IsValid || HFI.External);
HFI.IsValid = true;
HFI.IndexHeaderMapHeader = OtherHFI.IndexHeaderMapHeader;
if (HFI.Framework.empty())
HFI.Framework = OtherHFI.Framework;
}
/// getFileInfo - Return the HeaderFileInfo structure for the specified
/// FileEntry.
HeaderFileInfo &HeaderSearch::getFileInfo(const FileEntry *FE) {
if (FE->getUID() >= FileInfo.size())
FileInfo.resize(FE->getUID() + 1);
HeaderFileInfo *HFI = &FileInfo[FE->getUID()];
// FIXME: Use a generation count to check whether this is really up to date.
if (ExternalSource && !HFI->Resolved) {
auto ExternalHFI = ExternalSource->GetHeaderFileInfo(FE);
if (ExternalHFI.IsValid) {
HFI->Resolved = true;
if (ExternalHFI.External)
mergeHeaderFileInfo(*HFI, ExternalHFI);
}
}
HFI->IsValid = true;
// We have local information about this header file, so it's no longer
// strictly external.
HFI->External = false;
return *HFI;
}
const HeaderFileInfo *
HeaderSearch::getExistingFileInfo(const FileEntry *FE,
bool WantExternal) const {
// If we have an external source, ensure we have the latest information.
// FIXME: Use a generation count to check whether this is really up to date.
HeaderFileInfo *HFI;
if (ExternalSource) {
if (FE->getUID() >= FileInfo.size()) {
if (!WantExternal)
return nullptr;
FileInfo.resize(FE->getUID() + 1);
}
HFI = &FileInfo[FE->getUID()];
if (!WantExternal && (!HFI->IsValid || HFI->External))
return nullptr;
if (!HFI->Resolved) {
auto ExternalHFI = ExternalSource->GetHeaderFileInfo(FE);
if (ExternalHFI.IsValid) {
HFI->Resolved = true;
if (ExternalHFI.External)
mergeHeaderFileInfo(*HFI, ExternalHFI);
}
}
} else if (FE->getUID() >= FileInfo.size()) {
return nullptr;
} else {
HFI = &FileInfo[FE->getUID()];
}
if (!HFI->IsValid || (HFI->External && !WantExternal))
return nullptr;
return HFI;
}
bool HeaderSearch::isFileMultipleIncludeGuarded(const FileEntry *File) {
// Check if we've entered this file and found an include guard or #pragma
// once. Note that we dor't check for #import, because that's not a property
// of the file itself.
if (auto *HFI = getExistingFileInfo(File))
return HFI->isPragmaOnce || HFI->ControllingMacro ||
HFI->ControllingMacroID;
return false;
}
void HeaderSearch::MarkFileModuleHeader(const FileEntry *FE,
ModuleMap::ModuleHeaderRole Role,
bool isCompilingModuleHeader) {
bool isModularHeader = !(Role & ModuleMap::TextualHeader);
// Don't mark the file info as non-external if there's nothing to change.
if (!isCompilingModuleHeader) {
if (!isModularHeader)
return;
auto *HFI = getExistingFileInfo(FE);
if (HFI && HFI->isModuleHeader)
return;
}
auto &HFI = getFileInfo(FE);
HFI.isModuleHeader |= isModularHeader;
HFI.isCompilingModuleHeader |= isCompilingModuleHeader;
}
bool HeaderSearch::ShouldEnterIncludeFile(Preprocessor &PP,
const FileEntry *File, bool isImport,
bool ModulesEnabled, Module *M) {
++NumIncluded; // Count # of attempted #includes.
// Get information about this file.
HeaderFileInfo &FileInfo = getFileInfo(File);
// FIXME: this is a workaround for the lack of proper modules-aware support
// for #import / #pragma once
auto TryEnterImported = [&]() -> bool {
if (!ModulesEnabled)
return false;
// Ensure FileInfo bits are up to date.
ModMap.resolveHeaderDirectives(File);
// Modules with builtins are special; multiple modules use builtins as
// modular headers, example:
//
// module stddef { header "stddef.h" export * }
//
// After module map parsing, this expands to:
//
// module stddef {
// header "/path_to_builtin_dirs/stddef.h"
// textual "stddef.h"
// }
//
// It's common that libc++ and system modules will both define such
// submodules. Make sure cached results for a builtin header won't
// prevent other builtin modules from potentially entering the builtin
// header. Note that builtins are header guarded and the decision to
// actually enter them is postponed to the controlling macros logic below.
bool TryEnterHdr = false;
if (FileInfo.isCompilingModuleHeader && FileInfo.isModuleHeader)
TryEnterHdr = ModMap.isBuiltinHeader(File);
// Textual headers can be #imported from different modules. Since ObjC
// headers find in the wild might rely only on #import and do not contain
// controlling macros, be conservative and only try to enter textual headers
// if such macro is present.
if (!FileInfo.isModuleHeader &&
FileInfo.getControllingMacro(ExternalLookup))
TryEnterHdr = true;
return TryEnterHdr;
};
// If this is a #import directive, check that we have not already imported
// this header.
if (isImport) {
// If this has already been imported, don't import it again.
FileInfo.isImport = true;
// Has this already been #import'ed or #include'd?
if (FileInfo.NumIncludes && !TryEnterImported())
return false;
} else {
// Otherwise, if this is a #include of a file that was previously #import'd
// or if this is the second #include of a #pragma once file, ignore it.
if (FileInfo.isImport && !TryEnterImported())
return false;
}
// Next, check to see if the file is wrapped with #ifndef guards. If so, and
// if the macro that guards it is defined, we know the #include has no effect.
if (const IdentifierInfo *ControllingMacro
= FileInfo.getControllingMacro(ExternalLookup)) {
// If the header corresponds to a module, check whether the macro is already
// defined in that module rather than checking in the current set of visible
// modules.
if (M ? PP.isMacroDefinedInLocalModule(ControllingMacro, M)
: PP.isMacroDefined(ControllingMacro)) {
++NumMultiIncludeFileOptzn;
return false;
}
}
// Increment the number of times this file has been included.
++FileInfo.NumIncludes;
return true;
}
size_t HeaderSearch::getTotalMemory() const {
return SearchDirs.capacity()
+ llvm::capacity_in_bytes(FileInfo)
+ llvm::capacity_in_bytes(HeaderMaps)
+ LookupFileCache.getAllocator().getTotalMemory()
+ FrameworkMap.getAllocator().getTotalMemory();
}
StringRef HeaderSearch::getUniqueFrameworkName(StringRef Framework) {
return FrameworkNames.insert(Framework).first->first();
}
bool HeaderSearch::hasModuleMap(StringRef FileName,
const DirectoryEntry *Root,
bool IsSystem) {
if (!HSOpts->ImplicitModuleMaps)
return false;
SmallVector<const DirectoryEntry *, 2> FixUpDirectories;
StringRef DirName = FileName;
do {
// Get the parent directory name.
DirName = llvm::sys::path::parent_path(DirName);
if (DirName.empty())
return false;
// Determine whether this directory exists.
auto Dir = FileMgr.getDirectory(DirName);
if (!Dir)
return false;
// Try to load the module map file in this directory.
switch (loadModuleMapFile(*Dir, IsSystem,
llvm::sys::path::extension((*Dir)->getName()) ==
".framework")) {
case LMM_NewlyLoaded:
case LMM_AlreadyLoaded:
// Success. All of the directories we stepped through inherit this module
// map file.
for (unsigned I = 0, N = FixUpDirectories.size(); I != N; ++I)
DirectoryHasModuleMap[FixUpDirectories[I]] = true;
return true;
case LMM_NoDirectory:
case LMM_InvalidModuleMap:
break;
}
// If we hit the top of our search, we're done.
if (*Dir == Root)
return false;
// Keep track of all of the directories we checked, so we can mark them as
// having module maps if we eventually do find a module map.
FixUpDirectories.push_back(*Dir);
} while (true);
}
ModuleMap::KnownHeader
HeaderSearch::findModuleForHeader(const FileEntry *File,
bool AllowTextual) const {
if (ExternalSource) {
// Make sure the external source has handled header info about this file,
// which includes whether the file is part of a module.
(void)getExistingFileInfo(File);
}
return ModMap.findModuleForHeader(File, AllowTextual);
}
ArrayRef<ModuleMap::KnownHeader>
HeaderSearch::findAllModulesForHeader(const FileEntry *File) const {
if (ExternalSource) {
// Make sure the external source has handled header info about this file,
// which includes whether the file is part of a module.
(void)getExistingFileInfo(File);
}
return ModMap.findAllModulesForHeader(File);
}
static bool suggestModule(HeaderSearch &HS, const FileEntry *File,
Module *RequestingModule,
ModuleMap::KnownHeader *SuggestedModule) {
ModuleMap::KnownHeader Module =
HS.findModuleForHeader(File, /*AllowTextual*/true);
// If this module specifies [no_undeclared_includes], we cannot find any
// file that's in a non-dependency module.
if (RequestingModule && Module && RequestingModule->NoUndeclaredIncludes) {
HS.getModuleMap().resolveUses(RequestingModule, /*Complain*/ false);
if (!RequestingModule->directlyUses(Module.getModule())) {
// Builtin headers are a special case. Multiple modules can use the same
// builtin as a modular header (see also comment in
// ShouldEnterIncludeFile()), so the builtin header may have been
// "claimed" by an unrelated module. This shouldn't prevent us from
// including the builtin header textually in this module.
if (HS.getModuleMap().isBuiltinHeader(File)) {
if (SuggestedModule)
*SuggestedModule = ModuleMap::KnownHeader();
return true;
}
return false;
}
}
if (SuggestedModule)
*SuggestedModule = (Module.getRole() & ModuleMap::TextualHeader)
? ModuleMap::KnownHeader()
: Module;
return true;
}
bool HeaderSearch::findUsableModuleForHeader(
const FileEntry *File, const DirectoryEntry *Root, Module *RequestingModule,
ModuleMap::KnownHeader *SuggestedModule, bool IsSystemHeaderDir) {
if (File && needModuleLookup(RequestingModule, SuggestedModule)) {
// If there is a module that corresponds to this header, suggest it.
hasModuleMap(File->getName(), Root, IsSystemHeaderDir);
return suggestModule(*this, File, RequestingModule, SuggestedModule);
}
return true;
}
bool HeaderSearch::findUsableModuleForFrameworkHeader(
const FileEntry *File, StringRef FrameworkName, Module *RequestingModule,
ModuleMap::KnownHeader *SuggestedModule, bool IsSystemFramework) {
// If we're supposed to suggest a module, look for one now.
if (needModuleLookup(RequestingModule, SuggestedModule)) {
// Find the top-level framework based on this framework.
SmallVector<std::string, 4> SubmodulePath;
const DirectoryEntry *TopFrameworkDir
= ::getTopFrameworkDir(FileMgr, FrameworkName, SubmodulePath);
// Determine the name of the top-level framework.
StringRef ModuleName = llvm::sys::path::stem(TopFrameworkDir->getName());
// Load this framework module. If that succeeds, find the suggested module
// for this header, if any.
loadFrameworkModule(ModuleName, TopFrameworkDir, IsSystemFramework);
// FIXME: This can find a module not part of ModuleName, which is
// important so that we're consistent about whether this header
// corresponds to a module. Possibly we should lock down framework modules
// so that this is not possible.
return suggestModule(*this, File, RequestingModule, SuggestedModule);
}
return true;
}
static const FileEntry *getPrivateModuleMap(const FileEntry *File,
FileManager &FileMgr) {
StringRef Filename = llvm::sys::path::filename(File->getName());
SmallString<128> PrivateFilename(File->getDir()->getName());
if (Filename == "module.map")
llvm::sys::path::append(PrivateFilename, "module_private.map");
else if (Filename == "module.modulemap")
llvm::sys::path::append(PrivateFilename, "module.private.modulemap");
else
return nullptr;
if (auto File = FileMgr.getFile(PrivateFilename))
return *File;
return nullptr;
}
bool HeaderSearch::loadModuleMapFile(const FileEntry *File, bool IsSystem,
FileID ID, unsigned *Offset,
StringRef OriginalModuleMapFile) {
// Find the directory for the module. For frameworks, that may require going
// up from the 'Modules' directory.
const DirectoryEntry *Dir = nullptr;
if (getHeaderSearchOpts().ModuleMapFileHomeIsCwd) {
if (auto DirOrErr = FileMgr.getDirectory("."))
Dir = *DirOrErr;
} else {
if (!OriginalModuleMapFile.empty()) {
// We're building a preprocessed module map. Find or invent the directory
// that it originally occupied.
auto DirOrErr = FileMgr.getDirectory(
llvm::sys::path::parent_path(OriginalModuleMapFile));
if (DirOrErr) {
Dir = *DirOrErr;
} else {
auto *FakeFile = FileMgr.getVirtualFile(OriginalModuleMapFile, 0, 0);
Dir = FakeFile->getDir();
}
} else {
Dir = File->getDir();
}
StringRef DirName(Dir->getName());
if (llvm::sys::path::filename(DirName) == "Modules") {
DirName = llvm::sys::path::parent_path(DirName);
if (DirName.endswith(".framework"))
if (auto DirOrErr = FileMgr.getDirectory(DirName))
Dir = *DirOrErr;
// FIXME: This assert can fail if there's a race between the above check
// and the removal of the directory.
assert(Dir && "parent must exist");
}
}
switch (loadModuleMapFileImpl(File, IsSystem, Dir, ID, Offset)) {
case LMM_AlreadyLoaded:
case LMM_NewlyLoaded:
return false;
case LMM_NoDirectory:
case LMM_InvalidModuleMap:
return true;
}
llvm_unreachable("Unknown load module map result");
}
HeaderSearch::LoadModuleMapResult
HeaderSearch::loadModuleMapFileImpl(const FileEntry *File, bool IsSystem,
const DirectoryEntry *Dir, FileID ID,
unsigned *Offset) {
assert(File && "expected FileEntry");
// Check whether we've already loaded this module map, and mark it as being
// loaded in case we recursively try to load it from itself.
auto AddResult = LoadedModuleMaps.insert(std::make_pair(File, true));
if (!AddResult.second)
return AddResult.first->second ? LMM_AlreadyLoaded : LMM_InvalidModuleMap;
if (ModMap.parseModuleMapFile(File, IsSystem, Dir, ID, Offset)) {
LoadedModuleMaps[File] = false;
return LMM_InvalidModuleMap;
}
// Try to load a corresponding private module map.
if (const FileEntry *PMMFile = getPrivateModuleMap(File, FileMgr)) {
if (ModMap.parseModuleMapFile(PMMFile, IsSystem, Dir)) {
LoadedModuleMaps[File] = false;
return LMM_InvalidModuleMap;
}
}
// This directory has a module map.
return LMM_NewlyLoaded;
}
const FileEntry *
HeaderSearch::lookupModuleMapFile(const DirectoryEntry *Dir, bool IsFramework) {
if (!HSOpts->ImplicitModuleMaps)
return nullptr;
// For frameworks, the preferred spelling is Modules/module.modulemap, but
// module.map at the framework root is also accepted.
SmallString<128> ModuleMapFileName(Dir->getName());
if (IsFramework)
llvm::sys::path::append(ModuleMapFileName, "Modules");
llvm::sys::path::append(ModuleMapFileName, "module.modulemap");
if (auto F = FileMgr.getFile(ModuleMapFileName))
return *F;
// Continue to allow module.map
ModuleMapFileName = Dir->getName();
llvm::sys::path::append(ModuleMapFileName, "module.map");
if (auto F = FileMgr.getFile(ModuleMapFileName))
return *F;
// For frameworks, allow to have a private module map with a preferred
// spelling when a public module map is absent.
if (IsFramework) {
ModuleMapFileName = Dir->getName();
llvm::sys::path::append(ModuleMapFileName, "Modules",
"module.private.modulemap");
if (auto F = FileMgr.getFile(ModuleMapFileName))
return *F;
}
return nullptr;
}
Module *HeaderSearch::loadFrameworkModule(StringRef Name,
const DirectoryEntry *Dir,
bool IsSystem) {
if (Module *Module = ModMap.findModule(Name))
return Module;
// Try to load a module map file.
switch (loadModuleMapFile(Dir, IsSystem, /*IsFramework*/true)) {
case LMM_InvalidModuleMap:
// Try to infer a module map from the framework directory.
if (HSOpts->ImplicitModuleMaps)
ModMap.inferFrameworkModule(Dir, IsSystem, /*Parent=*/nullptr);
break;
case LMM_AlreadyLoaded:
case LMM_NoDirectory:
return nullptr;
case LMM_NewlyLoaded:
break;
}
return ModMap.findModule(Name);
}
HeaderSearch::LoadModuleMapResult
HeaderSearch::loadModuleMapFile(StringRef DirName, bool IsSystem,
bool IsFramework) {
if (auto Dir = FileMgr.getDirectory(DirName))
return loadModuleMapFile(*Dir, IsSystem, IsFramework);
return LMM_NoDirectory;
}
HeaderSearch::LoadModuleMapResult
HeaderSearch::loadModuleMapFile(const DirectoryEntry *Dir, bool IsSystem,
bool IsFramework) {
auto KnownDir = DirectoryHasModuleMap.find(Dir);
if (KnownDir != DirectoryHasModuleMap.end())
return KnownDir->second ? LMM_AlreadyLoaded : LMM_InvalidModuleMap;
if (const FileEntry *ModuleMapFile = lookupModuleMapFile(Dir, IsFramework)) {
LoadModuleMapResult Result =
loadModuleMapFileImpl(ModuleMapFile, IsSystem, Dir);
// Add Dir explicitly in case ModuleMapFile is in a subdirectory.
// E.g. Foo.framework/Modules/module.modulemap
// ^Dir ^ModuleMapFile
if (Result == LMM_NewlyLoaded)
DirectoryHasModuleMap[Dir] = true;
else if (Result == LMM_InvalidModuleMap)
DirectoryHasModuleMap[Dir] = false;
return Result;
}
return LMM_InvalidModuleMap;
}
void HeaderSearch::collectAllModules(SmallVectorImpl<Module *> &Modules) {
Modules.clear();
if (HSOpts->ImplicitModuleMaps) {
// Load module maps for each of the header search directories.
for (unsigned Idx = 0, N = SearchDirs.size(); Idx != N; ++Idx) {
bool IsSystem = SearchDirs[Idx].isSystemHeaderDirectory();
if (SearchDirs[Idx].isFramework()) {
std::error_code EC;
SmallString<128> DirNative;
llvm::sys::path::native(SearchDirs[Idx].getFrameworkDir()->getName(),
DirNative);
// Search each of the ".framework" directories to load them as modules.
llvm::vfs::FileSystem &FS = FileMgr.getVirtualFileSystem();
for (llvm::vfs::directory_iterator Dir = FS.dir_begin(DirNative, EC),
DirEnd;
Dir != DirEnd && !EC; Dir.increment(EC)) {
if (llvm::sys::path::extension(Dir->path()) != ".framework")
continue;
auto FrameworkDir =
FileMgr.getDirectory(Dir->path());
if (!FrameworkDir)
continue;
// Load this framework module.
loadFrameworkModule(llvm::sys::path::stem(Dir->path()), *FrameworkDir,
IsSystem);
}
continue;
}
// FIXME: Deal with header maps.
if (SearchDirs[Idx].isHeaderMap())
continue;
// Try to load a module map file for the search directory.
loadModuleMapFile(SearchDirs[Idx].getDir(), IsSystem,
/*IsFramework*/ false);
// Try to load module map files for immediate subdirectories of this
// search directory.
loadSubdirectoryModuleMaps(SearchDirs[Idx]);
}
}
// Populate the list of modules.
for (ModuleMap::module_iterator M = ModMap.module_begin(),
MEnd = ModMap.module_end();
M != MEnd; ++M) {
Modules.push_back(M->getValue());
}
}
void HeaderSearch::loadTopLevelSystemModules() {
if (!HSOpts->ImplicitModuleMaps)
return;
// Load module maps for each of the header search directories.
for (unsigned Idx = 0, N = SearchDirs.size(); Idx != N; ++Idx) {
// We only care about normal header directories.
if (!SearchDirs[Idx].isNormalDir()) {
continue;
}
// Try to load a module map file for the search directory.
loadModuleMapFile(SearchDirs[Idx].getDir(),
SearchDirs[Idx].isSystemHeaderDirectory(),
SearchDirs[Idx].isFramework());
}
}
void HeaderSearch::loadSubdirectoryModuleMaps(DirectoryLookup &SearchDir) {
assert(HSOpts->ImplicitModuleMaps &&
"Should not be loading subdirectory module maps");
if (SearchDir.haveSearchedAllModuleMaps())
return;
std::error_code EC;
SmallString<128> Dir = SearchDir.getDir()->getName();
FileMgr.makeAbsolutePath(Dir);
SmallString<128> DirNative;
llvm::sys::path::native(Dir, DirNative);
llvm::vfs::FileSystem &FS = FileMgr.getVirtualFileSystem();
for (llvm::vfs::directory_iterator Dir = FS.dir_begin(DirNative, EC), DirEnd;
Dir != DirEnd && !EC; Dir.increment(EC)) {
bool IsFramework = llvm::sys::path::extension(Dir->path()) == ".framework";
if (IsFramework == SearchDir.isFramework())
loadModuleMapFile(Dir->path(), SearchDir.isSystemHeaderDirectory(),
SearchDir.isFramework());
}
SearchDir.setSearchedAllModuleMaps(true);
}
std::string HeaderSearch::suggestPathToFileForDiagnostics(
const FileEntry *File, llvm::StringRef MainFile, bool *IsSystem) {
// FIXME: We assume that the path name currently cached in the FileEntry is
// the most appropriate one for this analysis (and that it's spelled the
// same way as the corresponding header search path).
return suggestPathToFileForDiagnostics(File->getName(), /*WorkingDir=*/"",
MainFile, IsSystem);
}
std::string HeaderSearch::suggestPathToFileForDiagnostics(
llvm::StringRef File, llvm::StringRef WorkingDir, llvm::StringRef MainFile,
bool *IsSystem) {
using namespace llvm::sys;
unsigned BestPrefixLength = 0;
// Checks whether Dir and File shares a common prefix, if they do and that's
// the longest prefix we've seen so for it returns true and updates the
// BestPrefixLength accordingly.
auto CheckDir = [&](llvm::StringRef Dir) -> bool {
llvm::SmallString<32> DirPath(Dir.begin(), Dir.end());
if (!WorkingDir.empty() && !path::is_absolute(Dir))
fs::make_absolute(WorkingDir, DirPath);
path::remove_dots(DirPath, /*remove_dot_dot=*/true);
Dir = DirPath;
for (auto NI = path::begin(File), NE = path::end(File),
DI = path::begin(Dir), DE = path::end(Dir);
/*termination condition in loop*/; ++NI, ++DI) {
// '.' components in File are ignored.
while (NI != NE && *NI == ".")
++NI;
if (NI == NE)
break;
// '.' components in Dir are ignored.
while (DI != DE && *DI == ".")
++DI;
if (DI == DE) {
// Dir is a prefix of File, up to '.' components and choice of path
// separators.
unsigned PrefixLength = NI - path::begin(File);
if (PrefixLength > BestPrefixLength) {
BestPrefixLength = PrefixLength;
return true;
}
break;
}
// Consider all path separators equal.
if (NI->size() == 1 && DI->size() == 1 &&
path::is_separator(NI->front()) && path::is_separator(DI->front()))
continue;
if (*NI != *DI)
break;
}
return false;
};
for (unsigned I = 0; I != SearchDirs.size(); ++I) {
// FIXME: Support this search within frameworks and header maps.
if (!SearchDirs[I].isNormalDir())
continue;
StringRef Dir = SearchDirs[I].getDir()->getName();
if (CheckDir(Dir) && IsSystem)
*IsSystem = BestPrefixLength ? I >= SystemDirIdx : false;
}
// Try to shorten include path using TUs directory, if we couldn't find any
// suitable prefix in include search paths.
if (!BestPrefixLength && CheckDir(path::parent_path(MainFile)) && IsSystem)
*IsSystem = false;
return path::convert_to_slash(File.drop_front(BestPrefixLength));
}
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