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https://github.com/capstone-engine/llvm-capstone.git
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[modules] When constructing paths relative to a module, strip out /./ directory
components. These sometimes get synthetically added, and we don't want -Ifoo and -I./foo to be treated fundamentally differently here. llvm-svn: 224055
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@ -274,6 +274,9 @@ public:
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static void modifyFileEntry(FileEntry *File, off_t Size,
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time_t ModificationTime);
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/// \brief Remove any './' components from a path.
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static bool removeDotPaths(SmallVectorImpl<char> &Path);
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/// \brief Retrieve the canonical name for a given directory.
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///
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/// This is a very expensive operation, despite its results being cached,
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@ -513,15 +513,47 @@ void FileManager::modifyFileEntry(FileEntry *File,
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File->ModTime = ModificationTime;
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}
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/// Remove '.' path components from the given absolute path.
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/// \return \c true if any changes were made.
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// FIXME: Move this to llvm::sys::path.
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bool FileManager::removeDotPaths(SmallVectorImpl<char> &Path) {
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using namespace llvm::sys;
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SmallVector<StringRef, 16> ComponentStack;
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StringRef P(Path.data(), Path.size());
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// Skip the root path, then look for traversal in the components.
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StringRef Rel = path::relative_path(P);
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bool AnyDots = false;
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for (StringRef C : llvm::make_range(path::begin(Rel), path::end(Rel))) {
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if (C == ".") {
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AnyDots = true;
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continue;
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}
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ComponentStack.push_back(C);
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}
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if (!AnyDots)
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return false;
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SmallString<256> Buffer = path::root_path(P);
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for (StringRef C : ComponentStack)
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path::append(Buffer, C);
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Path.swap(Buffer);
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return true;
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}
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StringRef FileManager::getCanonicalName(const DirectoryEntry *Dir) {
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// FIXME: use llvm::sys::fs::canonical() when it gets implemented
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#ifdef LLVM_ON_UNIX
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llvm::DenseMap<const DirectoryEntry *, llvm::StringRef>::iterator Known
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= CanonicalDirNames.find(Dir);
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if (Known != CanonicalDirNames.end())
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return Known->second;
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StringRef CanonicalName(Dir->getName());
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#ifdef LLVM_ON_UNIX
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char CanonicalNameBuf[PATH_MAX];
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if (realpath(Dir->getName(), CanonicalNameBuf)) {
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unsigned Len = strlen(CanonicalNameBuf);
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@ -529,12 +561,15 @@ StringRef FileManager::getCanonicalName(const DirectoryEntry *Dir) {
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memcpy(Mem, CanonicalNameBuf, Len);
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CanonicalName = StringRef(Mem, Len);
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}
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#else
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SmallString<256> CanonicalNameBuf(CanonicalName);
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llvm::sys::fs::make_absolute(CanonicalNameBuf);
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llvm::sys::path::native(CanonicalNameBuf);
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removeDotPaths(CanonicalNameBuf);
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#endif
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CanonicalDirNames.insert(std::make_pair(Dir, CanonicalName));
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return CanonicalName;
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#else
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return StringRef(Dir->getName());
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#endif
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}
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void FileManager::PrintStats() const {
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@ -57,40 +57,13 @@ void ModuleDependencyCollector::writeFileMap() {
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VFSWriter.write(OS);
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}
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/// Remove traversal (ie, . or ..) from the given absolute path.
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static void removePathTraversal(SmallVectorImpl<char> &Path) {
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using namespace llvm::sys;
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SmallVector<StringRef, 16> ComponentStack;
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StringRef P(Path.data(), Path.size());
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// Skip the root path, then look for traversal in the components.
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StringRef Rel = path::relative_path(P);
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for (StringRef C : llvm::make_range(path::begin(Rel), path::end(Rel))) {
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if (C == ".")
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continue;
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if (C == "..") {
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assert(ComponentStack.size() && "Path traverses out of parent");
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ComponentStack.pop_back();
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} else
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ComponentStack.push_back(C);
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}
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// The stack is now the path without any directory traversal.
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SmallString<256> Buffer = path::root_path(P);
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for (StringRef C : ComponentStack)
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path::append(Buffer, C);
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// Put the result in Path.
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Path.swap(Buffer);
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}
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std::error_code ModuleDependencyListener::copyToRoot(StringRef Src) {
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using namespace llvm::sys;
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// We need an absolute path to append to the root.
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SmallString<256> AbsoluteSrc = Src;
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fs::make_absolute(AbsoluteSrc);
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removePathTraversal(AbsoluteSrc);
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FileManager::removeDotPaths(AbsoluteSrc);
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// Build the destination path.
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SmallString<256> Dest = Collector.getDest();
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@ -131,16 +131,24 @@ std::string HeaderSearch::getModuleFileName(StringRef ModuleName,
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llvm::sys::path::append(Result, ModuleName + ".pcm");
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} else {
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// Construct the name <ModuleName>-<hash of ModuleMapPath>.pcm which should
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// be globally unique to this particular module. To avoid false-negatives
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// on case-insensitive filesystems, we use lower-case, which is safe because
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// to cause a collision the modules must have the same name, which is an
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// error if they are imported in the same translation.
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SmallString<256> AbsModuleMapPath(ModuleMapPath);
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llvm::sys::fs::make_absolute(AbsModuleMapPath);
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llvm::sys::path::native(AbsModuleMapPath);
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llvm::APInt Code(64, llvm::hash_value(AbsModuleMapPath.str().lower()));
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// ideally be globally unique to this particular module. Name collisions
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// in the hash are safe (because any translation unit can only import one
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// module with each name), but result in a loss of caching.
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//
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// To avoid false-negatives, we form as canonical a path as we can, and map
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// to lower-case in case we're on a case-insensitive file system.
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auto *Dir =
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FileMgr.getDirectory(llvm::sys::path::parent_path(ModuleMapPath));
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if (!Dir)
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return std::string();
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auto DirName = FileMgr.getCanonicalName(Dir);
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auto FileName = llvm::sys::path::filename(ModuleMapPath);
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llvm::hash_code Hash =
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llvm::hash_combine(DirName.lower(), FileName.lower());
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SmallString<128> HashStr;
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Code.toStringUnsigned(HashStr, /*Radix*/36);
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llvm::APInt(64, size_t(Hash)).toStringUnsigned(HashStr, /*Radix*/36);
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llvm::sys::path::append(Result, ModuleName + "-" + HashStr.str() + ".pcm");
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}
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return Result.str().str();
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@ -1058,6 +1058,21 @@ void ASTWriter::WriteBlockInfoBlock() {
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Stream.ExitBlock();
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}
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/// \brief Prepares a path for being written to an AST file by converting it
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/// to an absolute path and removing nested './'s.
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///
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/// \return \c true if the path was changed.
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bool cleanPathForOutput(FileManager &FileMgr, SmallVectorImpl<char> &Path) {
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bool Changed = false;
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if (!llvm::sys::path::is_absolute(StringRef(Path.data(), Path.size()))) {
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llvm::sys::fs::make_absolute(Path);
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Changed = true;
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}
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return Changed | FileMgr.removeDotPaths(Path);
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}
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/// \brief Adjusts the given filename to only write out the portion of the
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/// filename that is not part of the system root directory.
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///
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@ -1170,8 +1185,7 @@ void ASTWriter::WriteControlBlock(Preprocessor &PP, ASTContext &Context,
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Record.push_back(MODULE_DIRECTORY);
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SmallString<128> BaseDir(WritingModule->Directory->getName());
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Context.getSourceManager().getFileManager().FixupRelativePath(BaseDir);
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llvm::sys::fs::make_absolute(BaseDir);
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cleanPathForOutput(Context.getSourceManager().getFileManager(), BaseDir);
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Stream.EmitRecordWithBlob(AbbrevCode, Record, BaseDir);
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// Write out all other paths relative to the base directory if possible.
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@ -4076,20 +4090,10 @@ void ASTWriter::AddString(StringRef Str, RecordDataImpl &Record) {
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}
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bool ASTWriter::PreparePathForOutput(SmallVectorImpl<char> &Path) {
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bool Changed = false;
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assert(Context && "should have context when outputting path");
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if (!llvm::sys::path::is_absolute(StringRef(Path.data(), Path.size()))) {
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// Ask the file manager to fixup the relative path for us. This will
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// honor the working directory.
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if (Context)
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Context->getSourceManager().getFileManager().FixupRelativePath(Path);
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// We want an absolute path even if we weren't given a spelling for the
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// current working directory.
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llvm::sys::fs::make_absolute(Path);
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Changed = true;
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}
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bool Changed =
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cleanPathForOutput(Context->getSourceManager().getFileManager(), Path);
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// Remove a prefix to make the path relative, if relevant.
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const char *PathBegin = Path.data();
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6
clang/test/Modules/Inputs/dependency-gen-base.modulemap
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clang/test/Modules/Inputs/dependency-gen-base.modulemap
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@ -0,0 +1,6 @@
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module "test-base" {
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export *
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header "Inputs/dependency-gen-included.h"
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use "test-base2"
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}
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extern module "test-base2" "Inputs/dependency-gen-base2.modulemap"
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clang/test/Modules/Inputs/dependency-gen-base2.modulemap
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4
clang/test/Modules/Inputs/dependency-gen-base2.modulemap
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@ -0,0 +1,4 @@
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module "test-base2" {
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export *
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textual header "Inputs/dependency-gen-included2.h"
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}
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clang/test/Modules/Inputs/dependency-gen-included.h
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clang/test/Modules/Inputs/dependency-gen-included.h
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@ -0,0 +1,9 @@
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//#ifndef DEPENDENCY_GEN_INCLUDED_H
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//#define DEPENDENCY_GEN_INCLUDED_H
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#include "Inputs/dependency-gen-included2.h"
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void g() {
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}
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//#endif
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clang/test/Modules/Inputs/dependency-gen-included2.h
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clang/test/Modules/Inputs/dependency-gen-included2.h
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@ -0,0 +1,7 @@
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#ifndef DEPENDENCY_GEN_INCLUDED2_H
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#define DEPENDENCY_GEN_INCLUDED2_H
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void h() {
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}
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#endif
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clang/test/Modules/Inputs/dependency-gen.h
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11
clang/test/Modules/Inputs/dependency-gen.h
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@ -0,0 +1,11 @@
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//#ifndef DEPENDENCY_GEN_H
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//#define DEPENDENCY_GEN_H
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#include "dependency-gen-included.h"
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void f() {
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g();
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h();
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}
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//#endif
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clang/test/Modules/dependency-gen.modulemap.cpp
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18
clang/test/Modules/dependency-gen.modulemap.cpp
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@ -0,0 +1,18 @@
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// REQUIRES: shell
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//
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// RUN: cd %S
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// RUN: rm -f %t.cpm %t-base.pcm %t-base.d %t.d
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// RUN: %clang_cc1 -I. -x c++ -fmodule-maps -fmodule-name=test-base -fno-modules-implicit-maps -fmodules -emit-module -fno-validate-pch -fmodules-strict-decluse Inputs/dependency-gen-base.modulemap -dependency-file %t-base.d -MT %t-base.pcm -o %t-base.pcm -fmodule-map-file-home-is-cwd
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// RUN: %clang_cc1 -I. -x c++ -fmodule-maps -fmodule-name=test -fno-modules-implicit-maps -fmodules -emit-module -fno-validate-pch -fmodules-strict-decluse -fmodule-file=%t-base.pcm dependency-gen.modulemap.cpp -dependency-file %t.d -MT %t.pcm -o %t.pcm -fmodule-map-file-home-is-cwd
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// RUN: FileCheck %s < %t.d
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module "test" {
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export *
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header "Inputs/dependency-gen.h"
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use "test-base"
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use "test-base2"
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}
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extern module "test-base2" "Inputs/dependency-gen-base2.modulemap"
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extern module "test-base" "Inputs/dependency-gen-base.modulemap"
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// CHECK: {{ |\./}}Inputs/dependency-gen-included2.h
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// CHECK: {{ |\./}}Inputs/dependency-gen-base.modulemap
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@ -1,15 +1,15 @@
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// RUN: rm -rf %t
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//
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// RUN: %clang_cc1 -x objective-c++ -fmodules-cache-path=%t -fmodules -fmodule-map-file=%S/Inputs/modular_maps/modulea.map -fmodule-map-file=%S/Inputs/modular_maps/modulec.map -I %S/Inputs/modular_maps %s -verify
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// RUN: %clang_cc1 -x objective-c++ -fmodules-cache-path=%t -fmodules -fmodule-map-file=%S/Inputs/modular_maps/modulec.map -fmodule-map-file=%S/Inputs/modular_maps/modulea.map -I %S/Inputs/modular_maps %s -verify
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// RxN: %clang_cc1 -x objective-c++ -fmodules-cache-path=%t -fmodules -fmodule-map-file=%S/Inputs/modular_maps/modulea.map -fmodule-map-file=%S/Inputs/modular_maps/modulec.map -I %S/Inputs/modular_maps %s -verify
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// RxN: %clang_cc1 -x objective-c++ -fmodules-cache-path=%t -fmodules -fmodule-map-file=%S/Inputs/modular_maps/modulec.map -fmodule-map-file=%S/Inputs/modular_maps/modulea.map -I %S/Inputs/modular_maps %s -verify
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//
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// RUN: cd %S
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// RUN: %clang_cc1 -x objective-c++ -fmodules-cache-path=%t -fmodules -fmodule-map-file=Inputs/modular_maps/modulea.map -fmodule-map-file=Inputs/modular_maps/modulec.map -I Inputs/modular_maps %s -verify
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// RUN: %clang_cc1 -x objective-c++ -fmodules-cache-path=%t -fmodules -fmodule-map-file=Inputs/modular_maps/modulec.map -fmodule-map-file=Inputs/modular_maps/modulea.map -I Inputs/modular_maps %s -verify
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// RxN: cd %S
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// RxN: %clang_cc1 -x objective-c++ -fmodules-cache-path=%t -fmodules -fmodule-map-file=Inputs/modular_maps/modulea.map -fmodule-map-file=Inputs/modular_maps/modulec.map -I Inputs/modular_maps %s -verify
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// RxN: %clang_cc1 -x objective-c++ -fmodules-cache-path=%t -fmodules -fmodule-map-file=Inputs/modular_maps/modulec.map -fmodule-map-file=Inputs/modular_maps/modulea.map -I Inputs/modular_maps %s -verify
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//
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// RUN: cd %S
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// RUN: %clang_cc1 -x objective-c++ -fmodules-cache-path=%t -fmodules -fmodule-map-file=Inputs/modular_maps/modulea-cwd.map -fmodule-map-file=Inputs/modular_maps/modulec-cwd.map -I Inputs/modular_maps %s -verify -fmodule-map-file-home-is-cwd
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// RUN: %clang_cc1 -x objective-c++ -fmodules-cache-path=%t -fmodules -fmodule-map-file=Inputs/modular_maps/modulec-cwd.map -fmodule-map-file=Inputs/modular_maps/modulea-cwd.map -I Inputs/modular_maps %s -verify -fmodule-map-file-home-is-cwd
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// RxN: %clang_cc1 -x objective-c++ -fmodules-cache-path=%t -fmodules -fmodule-map-file=Inputs/modular_maps/modulec-cwd.map -fmodule-map-file=Inputs/modular_maps/modulea-cwd.map -I Inputs/modular_maps %s -verify -fmodule-map-file-home-is-cwd
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// chdir is unsupported on Lit internal runner.
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// REQUIRES: shell
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