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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/Lex/HeaderMap.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/IdentifierTable.h"
#include "llvm/System/Path.h"
#include "llvm/ADT/SmallString.h"
#include <cstdio>
using namespace clang;
HeaderSearch::HeaderSearch(FileManager &FM) : FileMgr(FM), FrameworkMap(64) {
SystemDirIdx = 0;
NoCurDirSearch = false;
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 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)) {
HeaderMaps.push_back(std::make_pair(FE, HM));
return HM;
}
return 0;
}
//===----------------------------------------------------------------------===//
// 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(const char *FilenameStart,
const char *FilenameEnd,
HeaderSearch &HS) const {
llvm::SmallString<1024> TmpDir;
if (isNormalDir()) {
// Concatenate the requested file onto the directory.
// FIXME: Portability. Filename concatenation should be in sys::Path.
TmpDir += getDir()->getName();
TmpDir.push_back('/');
TmpDir.append(FilenameStart, FilenameEnd);
return HS.getFileMgr().getFile(TmpDir.begin(), TmpDir.end());
}
if (isFramework())
return DoFrameworkLookup(FilenameStart, FilenameEnd, HS);
assert(isHeaderMap() && "Unknown directory lookup");
return getHeaderMap()->LookupFile(FilenameStart, FilenameEnd,HS.getFileMgr());
}
/// DoFrameworkLookup - Do a lookup of the specified file in the current
/// DirectoryLookup, which is a framework directory.
const FileEntry *DirectoryLookup::DoFrameworkLookup(const char *FilenameStart,
const char *FilenameEnd,
HeaderSearch &HS) const {
FileManager &FileMgr = HS.getFileMgr();
// Framework names must have a '/' in the filename.
const char *SlashPos = std::find(FilenameStart, FilenameEnd, '/');
if (SlashPos == FilenameEnd) return 0;
// Find out if this is the home for the specified framework, by checking
// HeaderSearch. Possible answer are yes/no and unknown.
const DirectoryEntry *&FrameworkDirCache =
HS.LookupFrameworkCache(FilenameStart, SlashPos);
// If it is known and in some other directory, fail.
if (FrameworkDirCache && FrameworkDirCache != getFrameworkDir())
return 0;
// Otherwise, construct the path to this framework dir.
// FrameworkName = "/System/Library/Frameworks/"
llvm::SmallString<1024> FrameworkName;
FrameworkName += getFrameworkDir()->getName();
if (FrameworkName.empty() || FrameworkName.back() != '/')
FrameworkName.push_back('/');
// FrameworkName = "/System/Library/Frameworks/Cocoa"
FrameworkName.append(FilenameStart, SlashPos);
// FrameworkName = "/System/Library/Frameworks/Cocoa.framework/"
FrameworkName += ".framework/";
// If the cache entry is still unresolved, query to see if the cache entry is
// still unresolved. If so, check its existence now.
if (FrameworkDirCache == 0) {
HS.IncrementFrameworkLookupCount();
// If the framework dir doesn't exist, we fail.
// FIXME: It's probably more efficient to query this with FileMgr.getDir.
if (!llvm::sys::Path(std::string(FrameworkName.begin(),
FrameworkName.end())).exists())
return 0;
// Otherwise, if it does, remember that this is the right direntry for this
// framework.
FrameworkDirCache = getFrameworkDir();
}
// Check "/System/Library/Frameworks/Cocoa.framework/Headers/file.h"
unsigned OrigSize = FrameworkName.size();
FrameworkName += "Headers/";
FrameworkName.append(SlashPos+1, FilenameEnd);
if (const FileEntry *FE = FileMgr.getFile(FrameworkName.begin(),
FrameworkName.end())) {
return FE;
}
// Check "/System/Library/Frameworks/Cocoa.framework/PrivateHeaders/file.h"
const char *Private = "Private";
FrameworkName.insert(FrameworkName.begin()+OrigSize, Private,
Private+strlen(Private));
return FileMgr.getFile(FrameworkName.begin(), FrameworkName.end());
}
//===----------------------------------------------------------------------===//
// 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(const char *FilenameStart,
const char *FilenameEnd,
bool isAngled,
const DirectoryLookup *FromDir,
const DirectoryLookup *&CurDir,
const FileEntry *CurFileEnt) {
// If 'Filename' is absolute, check to see if it exists and no searching.
// FIXME: Portability. This should be a sys::Path interface, this doesn't
// handle things like C:\foo.txt right, nor win32 \\network\device\blah.
if (FilenameStart[0] == '/') {
CurDir = 0;
// If this was an #include_next "/absolute/file", fail.
if (FromDir) return 0;
// Otherwise, just return the file.
return FileMgr.getFile(FilenameStart, FilenameEnd);
}
// Step #0, 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) {
llvm::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(FilenameStart, FilenameEnd);
if (const FileEntry *FE = FileMgr.getFile(TmpDir.begin(), TmpDir.end())) {
// Leave CurDir unset.
// 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(CurFileEnt).DirInfo;
getFileInfo(FE).DirInfo = DirInfo;
return FE;
}
}
CurDir = 0;
// If this is a system #include, ignore the user #include locs.
unsigned i = isAngled ? SystemDirIdx : 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(FilenameStart, FilenameEnd).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 (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) {
const FileEntry *FE =
SearchDirs[i].LookupFile(FilenameStart, FilenameEnd, *this);
if (!FE) continue;
CurDir = &SearchDirs[i];
// This file is a system header or C++ unfriendly if the dir is.
getFileInfo(FE).DirInfo = CurDir->getDirCharacteristic();
// Remember this location for the next lookup we do.
CacheLookup.second = i;
return FE;
}
// 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(const char *FilenameStart,
const char *FilenameEnd,
const FileEntry *ContextFileEnt) {
assert(ContextFileEnt && "No context file?");
// Framework names must have a '/' in the filename. Find it.
const char *SlashPos = std::find(FilenameStart, FilenameEnd, '/');
if (SlashPos == FilenameEnd) 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 char *FrameworkPos = strstr(ContextName, ".framework/");
if (FrameworkPos == 0)
return 0;
llvm::SmallString<1024> FrameworkName(ContextName,
FrameworkPos+strlen(".framework/"));
// Append Frameworks/HIToolbox.framework/
FrameworkName += "Frameworks/";
FrameworkName.append(FilenameStart, SlashPos);
FrameworkName += ".framework/";
llvm::StringMapEntry<const DirectoryEntry *> &CacheLookup =
FrameworkMap.GetOrCreateValue(FilenameStart, SlashPos);
// Some other location?
if (CacheLookup.getValue() &&
CacheLookup.getKeyLength() == FrameworkName.size() &&
memcmp(CacheLookup.getKeyData(), &FrameworkName[0],
CacheLookup.getKeyLength()) != 0)
return 0;
// Cache subframework.
if (CacheLookup.getValue() == 0) {
++NumSubFrameworkLookups;
// If the framework dir doesn't exist, we fail.
const DirectoryEntry *Dir = FileMgr.getDirectory(FrameworkName.begin(),
FrameworkName.end());
if (Dir == 0) return 0;
// Otherwise, if it does, remember that this is the right direntry for this
// framework.
CacheLookup.setValue(Dir);
}
const FileEntry *FE = 0;
// Check ".../Frameworks/HIToolbox.framework/Headers/HIToolbox.h"
llvm::SmallString<1024> HeadersFilename(FrameworkName);
HeadersFilename += "Headers/";
HeadersFilename.append(SlashPos+1, FilenameEnd);
if (!(FE = FileMgr.getFile(HeadersFilename.begin(),
HeadersFilename.end()))) {
// Check ".../Frameworks/HIToolbox.framework/PrivateHeaders/HIToolbox.h"
HeadersFilename = FrameworkName;
HeadersFilename += "PrivateHeaders/";
HeadersFilename.append(SlashPos+1, FilenameEnd);
if (!(FE = FileMgr.getFile(HeadersFilename.begin(), HeadersFilename.end())))
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;
}
//===----------------------------------------------------------------------===//
// File Info Management.
//===----------------------------------------------------------------------===//
/// getFileInfo - Return the PerFileInfo structure for the specified
/// FileEntry.
HeaderSearch::PerFileInfo &HeaderSearch::getFileInfo(const FileEntry *FE) {
if (FE->getUID() >= FileInfo.size())
FileInfo.resize(FE->getUID()+1);
return FileInfo[FE->getUID()];
}
/// ShouldEnterIncludeFile - Mark the specified file as a target of of a
/// #include, #include_next, or #import directive. Return false if #including
/// the file will have no effect or true if we should include it.
bool HeaderSearch::ShouldEnterIncludeFile(const FileEntry *File, bool isImport){
++NumIncluded; // Count # of attempted #includes.
// Get information about this file.
PerFileInfo &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 (FileInfo.ControllingMacro &&
FileInfo.ControllingMacro->hasMacroDefinition()) {
++NumMultiIncludeFileOptzn;
return false;
}
// Increment the number of times this file has been included.
++FileInfo.NumIncludes;
return true;
}