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

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//===--- HeaderSearch.cpp - Resolve Header File Locations ---===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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/Lex/HeaderMap.h"
#include "clang/Lex/HeaderSearchOptions.h"
#include "clang/Lex/Lexer.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/Capacity.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include <cstdio>
using namespace clang;
const IdentifierInfo *
HeaderFileInfo::getControllingMacro(ExternalIdentifierLookup *External) {
if (ControllingMacro)
return ControllingMacro;
if (!ControllingMacroID || !External)
return 0;
ControllingMacro = External->GetIdentifier(ControllingMacroID);
return ControllingMacro;
}
ExternalHeaderFileInfoSource::~ExternalHeaderFileInfoSource() {}
HeaderSearch::HeaderSearch(llvm::IntrusiveRefCntPtr<HeaderSearchOptions> HSOpts,
FileManager &FM, DiagnosticsEngine &Diags,
const LangOptions &LangOpts,
const TargetInfo *Target)
: HSOpts(HSOpts), FileMgr(FM), FrameworkMap(64),
ModMap(FileMgr, *Diags.getClient(), LangOpts, Target)
{
AngledDirIdx = 0;
SystemDirIdx = 0;
NoCurDirSearch = false;
ExternalLookup = 0;
ExternalSource = 0;
NumIncluded = 0;
NumMultiIncludeFileOptzn = 0;
NumFrameworkLookups = NumSubFrameworkLookups = 0;
}
HeaderSearch::~HeaderSearch() {
// Delete headermaps.
for (unsigned i = 0, e = HeaderMaps.size(); i != e; ++i)
delete HeaderMaps[i].second;
}
void HeaderSearch::PrintStats() {
fprintf(stderr, "\n*** HeaderSearch Stats:\n");
fprintf(stderr, "%d files tracked.\n", (int)FileInfo.size());
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;
}
fprintf(stderr, " %d #import/#pragma once files.\n", NumOnceOnlyFiles);
fprintf(stderr, " %d included exactly once.\n", NumSingleIncludedFiles);
fprintf(stderr, " %d max times a file is included.\n", MaxNumIncludes);
fprintf(stderr, " %d #include/#include_next/#import.\n", NumIncluded);
fprintf(stderr, " %d #includes skipped due to"
" the multi-include optimization.\n", NumMultiIncludeFileOptzn);
fprintf(stderr, "%d framework lookups.\n", NumFrameworkLookups);
fprintf(stderr, "%d subframework lookups.\n", NumSubFrameworkLookups);
}
/// 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;
}
if (const HeaderMap *HM = HeaderMap::Create(FE, FileMgr)) {
HeaderMaps.push_back(std::make_pair(FE, HM));
return HM;
}
return 0;
}
std::string HeaderSearch::getModuleFileName(Module *Module) {
// If we don't have a module cache path, we can't do anything.
if (ModuleCachePath.empty())
return std::string();
SmallString<256> Result(ModuleCachePath);
llvm::sys::path::append(Result, Module->getTopLevelModule()->Name + ".pcm");
return Result.str().str();
}
std::string HeaderSearch::getModuleFileName(StringRef ModuleName) {
// If we don't have a module cache path, we can't do anything.
if (ModuleCachePath.empty())
return std::string();
SmallString<256> Result(ModuleCachePath);
llvm::sys::path::append(Result, ModuleName + ".pcm");
return Result.str().str();
}
Module *HeaderSearch::lookupModule(StringRef ModuleName, bool AllowSearch) {
// Look in the module map to determine if there is a module by this name.
Module *Module = ModMap.findModule(ModuleName);
if (Module || !AllowSearch)
return Module;
// Look through the various header search paths to load any avai;able 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.
SmallString<128> FrameworkDirName;
FrameworkDirName += SearchDirs[Idx].getFrameworkDir()->getName();
llvm::sys::path::append(FrameworkDirName, ModuleName + ".framework");
if (const DirectoryEntry *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;
// Search for a module map file in this directory.
if (loadModuleMapFile(SearchDirs[Idx].getDir()) == 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) == LMM_NewlyLoaded) {
// If we just loaded a module map file, look for the module again.
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.
const char *DirectoryLookup::getName() const {
if (isNormalDir())
return getDir()->getName();
if (isFramework())
return getFrameworkDir()->getName();
assert(isHeaderMap() && "Unknown DirectoryLookup");
return getHeaderMap()->getFileName();
}
/// LookupFile - Lookup the specified file in this search path, returning it
/// if it exists or returning null if not.
const FileEntry *DirectoryLookup::LookupFile(
StringRef Filename,
HeaderSearch &HS,
SmallVectorImpl<char> *SearchPath,
SmallVectorImpl<char> *RelativePath,
Module **SuggestedModule,
bool &InUserSpecifiedSystemFramework) const {
InUserSpecifiedSystemFramework = false;
SmallString<1024> TmpDir;
if (isNormalDir()) {
// Concatenate the requested file onto the directory.
TmpDir = getDir()->getName();
llvm::sys::path::append(TmpDir, Filename);
if (SearchPath != NULL) {
StringRef SearchPathRef(getDir()->getName());
SearchPath->clear();
SearchPath->append(SearchPathRef.begin(), SearchPathRef.end());
}
if (RelativePath != NULL) {
RelativePath->clear();
RelativePath->append(Filename.begin(), Filename.end());
}
// If we have a module map that might map this header, load it and
// check whether we'll have a suggestion for a module.
if (SuggestedModule && HS.hasModuleMap(TmpDir, getDir())) {
const FileEntry *File = HS.getFileMgr().getFile(TmpDir.str(),
/*openFile=*/false);
if (!File)
return File;
// If there is a module that corresponds to this header,
// suggest it.
*SuggestedModule = HS.findModuleForHeader(File);
return File;
}
return HS.getFileMgr().getFile(TmpDir.str(), /*openFile=*/true);
}
if (isFramework())
return DoFrameworkLookup(Filename, HS, SearchPath, RelativePath,
SuggestedModule, InUserSpecifiedSystemFramework);
assert(isHeaderMap() && "Unknown directory lookup");
const FileEntry * const Result = getHeaderMap()->LookupFile(
Filename, HS.getFileMgr());
if (Result) {
if (SearchPath != NULL) {
StringRef SearchPathRef(getName());
SearchPath->clear();
SearchPath->append(SearchPathRef.begin(), SearchPathRef.end());
}
if (RelativePath != NULL) {
RelativePath->clear();
RelativePath->append(Filename.begin(), Filename.end());
}
}
return Result;
}
/// DoFrameworkLookup - Do a lookup of the specified file in the current
/// DirectoryLookup, which is a framework directory.
const FileEntry *DirectoryLookup::DoFrameworkLookup(
StringRef Filename,
HeaderSearch &HS,
SmallVectorImpl<char> *SearchPath,
SmallVectorImpl<char> *RelativePath,
Module **SuggestedModule,
bool &InUserSpecifiedSystemFramework) const
{
FileManager &FileMgr = HS.getFileMgr();
// Framework names must have a '/' in the filename.
size_t SlashPos = Filename.find('/');
if (SlashPos == StringRef::npos) return 0;
// Find out if this is the home for the specified framework, by checking
// HeaderSearch. Possible answers are yes/no and unknown.
HeaderSearch::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 0;
// Otherwise, construct the path to this framework dir.
// FrameworkName = "/System/Library/Frameworks/"
SmallString<1024> FrameworkName;
FrameworkName += getFrameworkDir()->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 == 0) {
HS.IncrementFrameworkLookupCount();
// If the framework dir doesn't exist, we fail.
const DirectoryEntry *Dir = FileMgr.getDirectory(FrameworkName.str());
if (Dir == 0) return 0;
// 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.str())) {
CacheEntry.IsUserSpecifiedSystemFramework = true;
}
}
}
// Set the 'user-specified system framework' flag.
InUserSpecifiedSystemFramework = CacheEntry.IsUserSpecifiedSystemFramework;
if (RelativePath != NULL) {
RelativePath->clear();
RelativePath->append(Filename.begin()+SlashPos+1, Filename.end());
}
// If we're allowed to look for modules, try to load or create the module
// corresponding to this framework.
Module *Module = 0;
if (SuggestedModule) {
if (const DirectoryEntry *FrameworkDir
= FileMgr.getDirectory(FrameworkName)) {
bool IsSystem = getDirCharacteristic() != SrcMgr::C_User;
Module = HS.loadFrameworkModule(ModuleName, FrameworkDir, IsSystem);
}
}
// Check "/System/Library/Frameworks/Cocoa.framework/Headers/file.h"
unsigned OrigSize = FrameworkName.size();
FrameworkName += "Headers/";
if (SearchPath != NULL) {
SearchPath->clear();
// Without trailing '/'.
SearchPath->append(FrameworkName.begin(), FrameworkName.end()-1);
}
// Determine whether this is the module we're building or not.
bool AutomaticImport = Module;
FrameworkName.append(Filename.begin()+SlashPos+1, Filename.end());
if (const FileEntry *FE = FileMgr.getFile(FrameworkName.str(),
/*openFile=*/!AutomaticImport)) {
if (AutomaticImport)
*SuggestedModule = HS.findModuleForHeader(FE);
return FE;
}
// Check "/System/Library/Frameworks/Cocoa.framework/PrivateHeaders/file.h"
const char *Private = "Private";
FrameworkName.insert(FrameworkName.begin()+OrigSize, Private,
Private+strlen(Private));
if (SearchPath != NULL)
SearchPath->insert(SearchPath->begin()+OrigSize, Private,
Private+strlen(Private));
const FileEntry *FE = FileMgr.getFile(FrameworkName.str(),
/*openFile=*/!AutomaticImport);
if (FE && AutomaticImport)
*SuggestedModule = HS.findModuleForHeader(FE);
return FE;
}
void HeaderSearch::setTarget(const TargetInfo &Target) {
ModMap.setTarget(Target);
}
//===----------------------------------------------------------------------===//
// Header File Location.
//===----------------------------------------------------------------------===//
/// 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 ""). CurFileEnt, if
/// non-null, indicates where the \#including file is, in case a relative search
/// is needed.
const FileEntry *HeaderSearch::LookupFile(
StringRef Filename,
bool isAngled,
const DirectoryLookup *FromDir,
const DirectoryLookup *&CurDir,
const FileEntry *CurFileEnt,
SmallVectorImpl<char> *SearchPath,
SmallVectorImpl<char> *RelativePath,
Module **SuggestedModule,
bool SkipCache)
{
if (SuggestedModule)
*SuggestedModule = 0;
// If 'Filename' is absolute, check to see if it exists and no searching.
if (llvm::sys::path::is_absolute(Filename)) {
CurDir = 0;
// If this was an #include_next "/absolute/file", fail.
if (FromDir) return 0;
if (SearchPath != NULL)
SearchPath->clear();
if (RelativePath != NULL) {
RelativePath->clear();
RelativePath->append(Filename.begin(), Filename.end());
}
// Otherwise, just return the file.
return FileMgr.getFile(Filename, /*openFile=*/true);
}
// Unless disabled, check to see if the file is in the #includer's
// directory. This has to be based on CurFileEnt, not CurDir, because
// CurFileEnt 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 (CurFileEnt && !isAngled && !NoCurDirSearch) {
SmallString<1024> TmpDir;
// Concatenate the requested file onto the directory.
// FIXME: Portability. Filename concatenation should be in sys::Path.
TmpDir += CurFileEnt->getDir()->getName();
TmpDir.push_back('/');
TmpDir.append(Filename.begin(), Filename.end());
if (const FileEntry *FE = FileMgr.getFile(TmpDir.str(),/*openFile=*/true)) {
// 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(CurFileEnt);
unsigned DirInfo = FromHFI.DirInfo;
bool IndexHeaderMapHeader = FromHFI.IndexHeaderMapHeader;
StringRef Framework = FromHFI.Framework;
HeaderFileInfo &ToHFI = getFileInfo(FE);
ToHFI.DirInfo = DirInfo;
ToHFI.IndexHeaderMapHeader = IndexHeaderMapHeader;
ToHFI.Framework = Framework;
if (SearchPath != NULL) {
StringRef SearchPathRef(CurFileEnt->getDir()->getName());
SearchPath->clear();
SearchPath->append(SearchPathRef.begin(), SearchPathRef.end());
}
if (RelativePath != NULL) {
RelativePath->clear();
RelativePath->append(Filename.begin(), Filename.end());
}
return FE;
}
}
CurDir = 0;
// 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.
std::pair<unsigned, unsigned> &CacheLookup =
LookupFileCache.GetOrCreateValue(Filename).getValue();
// 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.first == i+1) {
// Skip querying potentially lots of directories for this lookup.
i = CacheLookup.second;
} 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.first = i+1;
}
// Check each directory in sequence to see if it contains this file.
for (; i != SearchDirs.size(); ++i) {
bool InUserSpecifiedSystemFramework = false;
const FileEntry *FE =
SearchDirs[i].LookupFile(Filename, *this, SearchPath, RelativePath,
SuggestedModule, InUserSpecifiedSystemFramework);
if (!FE) continue;
CurDir = &SearchDirs[i];
// This file is a system header or C++ unfriendly if the dir is.
HeaderFileInfo &HFI = getFileInfo(FE);
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));
}
}
// Remember this location for the next lookup we do.
CacheLookup.second = i;
return FE;
}
// 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 (CurFileEnt && !isAngled && Filename.find('/') == StringRef::npos) {
HeaderFileInfo &IncludingHFI = getFileInfo(CurFileEnt);
if (IncludingHFI.IndexHeaderMapHeader) {
SmallString<128> ScratchFilename;
ScratchFilename += IncludingHFI.Framework;
ScratchFilename += '/';
ScratchFilename += Filename;
const FileEntry *Result = LookupFile(ScratchFilename, /*isAngled=*/true,
FromDir, CurDir, CurFileEnt,
SearchPath, RelativePath,
SuggestedModule);
std::pair<unsigned, unsigned> &CacheLookup
= LookupFileCache.GetOrCreateValue(Filename).getValue();
CacheLookup.second
= LookupFileCache.GetOrCreateValue(ScratchFilename).getValue().second;
return Result;
}
}
// Otherwise, didn't find it. Remember we didn't find this.
CacheLookup.second = SearchDirs.size();
return 0;
}
/// 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.
const FileEntry *HeaderSearch::
LookupSubframeworkHeader(StringRef Filename,
const FileEntry *ContextFileEnt,
SmallVectorImpl<char> *SearchPath,
SmallVectorImpl<char> *RelativePath) {
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 0;
// Look up the base framework name of the ContextFileEnt.
const char *ContextName = ContextFileEnt->getName();
// If the context info wasn't a framework, couldn't be a subframework.
const unsigned DotFrameworkLen = 10;
const char *FrameworkPos = strstr(ContextName, ".framework");
if (FrameworkPos == 0 ||
(FrameworkPos[DotFrameworkLen] != '/' &&
FrameworkPos[DotFrameworkLen] != '\\'))
return 0;
SmallString<1024> FrameworkName(ContextName, FrameworkPos+DotFrameworkLen+1);
// Append Frameworks/HIToolbox.framework/
FrameworkName += "Frameworks/";
FrameworkName.append(Filename.begin(), Filename.begin()+SlashPos);
FrameworkName += ".framework/";
llvm::StringMapEntry<FrameworkCacheEntry> &CacheLookup =
FrameworkMap.GetOrCreateValue(Filename.substr(0, SlashPos));
// Some other location?
if (CacheLookup.getValue().Directory &&
CacheLookup.getKeyLength() == FrameworkName.size() &&
memcmp(CacheLookup.getKeyData(), &FrameworkName[0],
CacheLookup.getKeyLength()) != 0)
return 0;
// Cache subframework.
if (CacheLookup.getValue().Directory == 0) {
++NumSubFrameworkLookups;
// If the framework dir doesn't exist, we fail.
const DirectoryEntry *Dir = FileMgr.getDirectory(FrameworkName.str());
if (Dir == 0) return 0;
// Otherwise, if it does, remember that this is the right direntry for this
// framework.
CacheLookup.getValue().Directory = Dir;
}
const FileEntry *FE = 0;
if (RelativePath != NULL) {
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 != NULL) {
SearchPath->clear();
// Without trailing '/'.
SearchPath->append(HeadersFilename.begin(), HeadersFilename.end()-1);
}
HeadersFilename.append(Filename.begin()+SlashPos+1, Filename.end());
if (!(FE = FileMgr.getFile(HeadersFilename.str(), /*openFile=*/true))) {
// Check ".../Frameworks/HIToolbox.framework/PrivateHeaders/HIToolbox.h"
HeadersFilename = FrameworkName;
HeadersFilename += "PrivateHeaders/";
if (SearchPath != NULL) {
SearchPath->clear();
// Without trailing '/'.
SearchPath->append(HeadersFilename.begin(), HeadersFilename.end()-1);
}
HeadersFilename.append(Filename.begin()+SlashPos+1, Filename.end());
if (!(FE = FileMgr.getFile(HeadersFilename.str(), /*openFile=*/true)))
return 0;
}
// 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(FE).DirInfo = DirInfo;
return FE;
}
/// \brief Helper static function to normalize a path for injection into
/// a synthetic header.
/*static*/ std::string
HeaderSearch::NormalizeDashIncludePath(StringRef File, FileManager &FileMgr) {
// Implicit include paths should be resolved relative to the current
// working directory first, and then use the regular header search
// mechanism. The proper way to handle this is to have the
// predefines buffer located at the current working directory, but
// it has no file entry. For now, workaround this by using an
// absolute path if we find the file here, and otherwise letting
// header search handle it.
SmallString<128> Path(File);
llvm::sys::fs::make_absolute(Path);
bool exists;
if (llvm::sys::fs::exists(Path.str(), exists) || !exists)
Path = File;
else if (exists)
FileMgr.getFile(File);
return Lexer::Stringify(Path.str());
}
//===----------------------------------------------------------------------===//
// File Info Management.
//===----------------------------------------------------------------------===//
/// \brief 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) {
HFI.isImport |= OtherHFI.isImport;
HFI.isPragmaOnce |= OtherHFI.isPragmaOnce;
HFI.NumIncludes += OtherHFI.NumIncludes;
if (!HFI.ControllingMacro && !HFI.ControllingMacroID) {
HFI.ControllingMacro = OtherHFI.ControllingMacro;
HFI.ControllingMacroID = OtherHFI.ControllingMacroID;
}
if (OtherHFI.External) {
HFI.DirInfo = OtherHFI.DirInfo;
HFI.External = OtherHFI.External;
HFI.IndexHeaderMapHeader = OtherHFI.IndexHeaderMapHeader;
}
if (HFI.Framework.empty())
HFI.Framework = OtherHFI.Framework;
HFI.Resolved = true;
}
/// 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()];
if (ExternalSource && !HFI.Resolved)
mergeHeaderFileInfo(HFI, ExternalSource->GetHeaderFileInfo(FE));
return HFI;
}
bool HeaderSearch::isFileMultipleIncludeGuarded(const FileEntry *File) {
// Check if we've ever seen this file as a header.
if (File->getUID() >= FileInfo.size())
return false;
// Resolve header file info from the external source, if needed.
HeaderFileInfo &HFI = FileInfo[File->getUID()];
if (ExternalSource && !HFI.Resolved)
mergeHeaderFileInfo(HFI, ExternalSource->GetHeaderFileInfo(File));
return HFI.isPragmaOnce || HFI.ControllingMacro || HFI.ControllingMacroID;
}
void HeaderSearch::setHeaderFileInfoForUID(HeaderFileInfo HFI, unsigned UID) {
if (UID >= FileInfo.size())
FileInfo.resize(UID+1);
HFI.Resolved = true;
FileInfo[UID] = HFI;
}
bool HeaderSearch::ShouldEnterIncludeFile(const FileEntry *File, bool isImport){
++NumIncluded; // Count # of attempted #includes.
// Get information about this file.
HeaderFileInfo &FileInfo = getFileInfo(File);
// 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) 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)
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 (ControllingMacro->hasMacroDefinition()) {
++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.GetOrCreateValue(Framework).getKey();
}
bool HeaderSearch::hasModuleMap(StringRef FileName,
const DirectoryEntry *Root) {
llvm::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.
const DirectoryEntry *Dir = FileMgr.getDirectory(DirName);
if (!Dir)
return false;
// Try to load the module map file in this directory.
switch (loadModuleMapFile(Dir)) {
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);
}
Module *HeaderSearch::findModuleForHeader(const FileEntry *File) {
if (Module *Mod = ModMap.findModuleForHeader(File))
return Mod;
return 0;
}
bool HeaderSearch::loadModuleMapFile(const FileEntry *File) {
const DirectoryEntry *Dir = File->getDir();
llvm::DenseMap<const DirectoryEntry *, bool>::iterator KnownDir
= DirectoryHasModuleMap.find(Dir);
if (KnownDir != DirectoryHasModuleMap.end())
return !KnownDir->second;
bool Result = ModMap.parseModuleMapFile(File);
if (!Result && llvm::sys::path::filename(File->getName()) == "module.map") {
// If the file we loaded was a module.map, look for the corresponding
// module_private.map.
SmallString<128> PrivateFilename(Dir->getName());
llvm::sys::path::append(PrivateFilename, "module_private.map");
if (const FileEntry *PrivateFile = FileMgr.getFile(PrivateFilename))
Result = ModMap.parseModuleMapFile(PrivateFile);
}
DirectoryHasModuleMap[Dir] = !Result;
return Result;
}
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)) {
case LMM_InvalidModuleMap:
break;
case LMM_AlreadyLoaded:
case LMM_NoDirectory:
return 0;
case LMM_NewlyLoaded:
return ModMap.findModule(Name);
}
// The top-level framework directory, from which we'll infer a framework
// module.
const DirectoryEntry *TopFrameworkDir = Dir;
// The path from the module we're actually looking for back to the top-level
// framework name.
llvm::SmallVector<StringRef, 2> SubmodulePath;
SubmodulePath.push_back(Name);
// Walk the directory structure to find any enclosing frameworks.
#ifdef LLVM_ON_UNIX
// Note: as an egregious but useful hack we use the real path here, because
// frameworks moving from top-level frameworks to embedded frameworks tend
// to be symlinked from the top-level location to the embedded location,
// and we need to resolve lookups as if we had found the embedded location.
char RealDirName[PATH_MAX];
StringRef DirName;
if (realpath(Dir->getName(), RealDirName))
DirName = RealDirName;
else
DirName = Dir->getName();
#else
StringRef DirName = Dir->getName();
#endif
do {
// Get the parent directory name.
DirName = llvm::sys::path::parent_path(DirName);
if (DirName.empty())
break;
// Determine whether this directory exists.
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(llvm::sys::path::stem(DirName));
TopFrameworkDir = Dir;
}
} while (true);
// Determine whether we're allowed to infer a module map.
bool canInfer = false;
if (llvm::sys::path::has_parent_path(TopFrameworkDir->getName())) {
// Figure out the parent path.
StringRef Parent = llvm::sys::path::parent_path(TopFrameworkDir->getName());
if (const DirectoryEntry *ParentDir = FileMgr.getDirectory(Parent)) {
// If there's a module map file in the parent directory, it can
// explicitly allow us to infer framework modules.
switch (loadModuleMapFile(ParentDir)) {
case LMM_AlreadyLoaded:
case LMM_NewlyLoaded: {
StringRef Name = llvm::sys::path::stem(TopFrameworkDir->getName());
canInfer = ModMap.canInferFrameworkModule(ParentDir, Name, IsSystem);
break;
}
case LMM_InvalidModuleMap:
case LMM_NoDirectory:
break;
}
}
}
// If we're not allowed to infer a module map, we're done.
if (!canInfer)
return 0;
// Try to infer a module map from the top-level framework directory.
Module *Result = ModMap.inferFrameworkModule(SubmodulePath.back(),
TopFrameworkDir,
IsSystem,
/*Parent=*/0);
// Follow the submodule path to find the requested (sub)framework module
// within the top-level framework module.
SubmodulePath.pop_back();
while (!SubmodulePath.empty() && Result) {
Result = ModMap.lookupModuleQualified(SubmodulePath.back(), Result);
SubmodulePath.pop_back();
}
return Result;
}
HeaderSearch::LoadModuleMapResult
HeaderSearch::loadModuleMapFile(StringRef DirName) {
if (const DirectoryEntry *Dir = FileMgr.getDirectory(DirName))
return loadModuleMapFile(Dir);
return LMM_NoDirectory;
}
HeaderSearch::LoadModuleMapResult
HeaderSearch::loadModuleMapFile(const DirectoryEntry *Dir) {
llvm::DenseMap<const DirectoryEntry *, bool>::iterator KnownDir
= DirectoryHasModuleMap.find(Dir);
if (KnownDir != DirectoryHasModuleMap.end())
return KnownDir->second? LMM_AlreadyLoaded : LMM_InvalidModuleMap;
SmallString<128> ModuleMapFileName;
ModuleMapFileName += Dir->getName();
unsigned ModuleMapDirNameLen = ModuleMapFileName.size();
llvm::sys::path::append(ModuleMapFileName, "module.map");
if (const FileEntry *ModuleMapFile = FileMgr.getFile(ModuleMapFileName)) {
// We have found a module map file. Try to parse it.
if (ModMap.parseModuleMapFile(ModuleMapFile)) {
// No suitable module map.
DirectoryHasModuleMap[Dir] = false;
return LMM_InvalidModuleMap;
}
// This directory has a module map.
DirectoryHasModuleMap[Dir] = true;
// Check whether there is a private module map that we need to load as well.
ModuleMapFileName.erase(ModuleMapFileName.begin() + ModuleMapDirNameLen,
ModuleMapFileName.end());
llvm::sys::path::append(ModuleMapFileName, "module_private.map");
if (const FileEntry *PrivateModuleMapFile
= FileMgr.getFile(ModuleMapFileName)) {
if (ModMap.parseModuleMapFile(PrivateModuleMapFile)) {
// No suitable module map.
DirectoryHasModuleMap[Dir] = false;
return LMM_InvalidModuleMap;
}
}
return LMM_NewlyLoaded;
}
// No suitable module map.
DirectoryHasModuleMap[Dir] = false;
return LMM_InvalidModuleMap;
}
void HeaderSearch::collectAllModules(llvm::SmallVectorImpl<Module *> &Modules) {
Modules.clear();
// Load module maps for each of the header search directories.
for (unsigned Idx = 0, N = SearchDirs.size(); Idx != N; ++Idx) {
if (SearchDirs[Idx].isFramework()) {
llvm::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.
bool IsSystem = SearchDirs[Idx].getDirCharacteristic() != SrcMgr::C_User;
for (llvm::sys::fs::directory_iterator Dir(DirNative.str(), EC), DirEnd;
Dir != DirEnd && !EC; Dir.increment(EC)) {
if (llvm::sys::path::extension(Dir->path()) != ".framework")
continue;
const DirectoryEntry *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());
// Try to load module map files for immediate subdirectories of this search
// directory.
llvm::error_code EC;
SmallString<128> DirNative;
llvm::sys::path::native(SearchDirs[Idx].getDir()->getName(), DirNative);
for (llvm::sys::fs::directory_iterator Dir(DirNative.str(), EC), DirEnd;
Dir != DirEnd && !EC; Dir.increment(EC)) {
loadModuleMapFile(Dir->path());
}
}
// 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());
}
}
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