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llvm-project/clang/Lex/HeaderSearch.cpp

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//===--- HeaderSearch.cpp - Resolve Header File Locations ---===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and 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/Basic/FileManager.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/IdentifierTable.h"
#include "llvm/System/Path.h"
#include "llvm/ADT/SmallString.h"
using namespace clang;
HeaderSearch::HeaderSearch(FileManager &FM) : FileMgr(FM), FrameworkMap(64) {
SystemDirIdx = 0;
NoCurDirSearch = false;
NumIncluded = 0;
NumMultiIncludeFileOptzn = 0;
NumFrameworkLookups = NumSubFrameworkLookups = 0;
}
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);
}
//===----------------------------------------------------------------------===//
// Header File Location.
//===----------------------------------------------------------------------===//
const FileEntry *HeaderSearch::DoFrameworkLookup(const DirectoryEntry *Dir,
const char *FilenameStart,
const char *FilenameEnd) {
// Framework names must have a '/' in the filename.
const char *SlashPos = std::find(FilenameStart, FilenameEnd, '/');
if (SlashPos == FilenameEnd) return 0;
llvm::StringMapEntry<const DirectoryEntry *> &CacheLookup =
FrameworkMap.GetOrCreateValue(FilenameStart, SlashPos);
// If it is some other directory, fail.
if (CacheLookup.getValue() && CacheLookup.getValue() != Dir)
return 0;
// FrameworkName = "/System/Library/Frameworks/"
llvm::SmallString<1024> FrameworkName;
FrameworkName += Dir->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 (CacheLookup.getValue() == 0) {
++NumFrameworkLookups;
// If the framework dir doesn't exist, we fail.
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.
CacheLookup.setValue(Dir);
}
// 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());
}
/// 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);
}
llvm::SmallString<1024> TmpDir;
// Step #0, unless disabled, check to see if the file is in the #includer's
// directory. This search is not done for <> headers.
if (CurFileEnt && !isAngled && !NoCurDirSearch) {
// 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.
getFileInfo(FE).DirInfo = getFileInfo(CurFileEnt).DirInfo;
return FE;
}
TmpDir.clear();
}
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];
// Check each directory in sequence to see if it contains this file.
for (; i != SearchDirs.size(); ++i) {
const FileEntry *FE = 0;
if (!SearchDirs[i].isFramework()) {
// FIXME: Portability. Adding file to dir should be in sys::Path.
// Concatenate the requested file onto the directory.
TmpDir.clear();
TmpDir += SearchDirs[i].getDir()->getName();
TmpDir.push_back('/');
TmpDir.append(FilenameStart, FilenameEnd);
FE = FileMgr.getFile(TmpDir.begin(), TmpDir.end());
} else {
FE = DoFrameworkLookup(SearchDirs[i].getDir(), FilenameStart,FilenameEnd);
}
if (FE) {
CurDir = &SearchDirs[i];
// This file is a system header or C++ unfriendly if the dir is.
getFileInfo(FE).DirInfo = CurDir->getDirCharacteristic();
return FE;
}
}
// Otherwise, didn't find it.
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) {
// 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.
getFileInfo(FE).DirInfo = getFileInfo(ContextFileEnt).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->getMacroInfo()) {
++NumMultiIncludeFileOptzn;
return false;
}
// Increment the number of times this file has been included.
++FileInfo.NumIncludes;
return true;
}
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