diff options
Diffstat (limited to 'lib/ReaderWriter/PECOFF/PECOFFLinkingContext.cpp')
| -rw-r--r-- | lib/ReaderWriter/PECOFF/PECOFFLinkingContext.cpp | 352 |
1 files changed, 0 insertions, 352 deletions
diff --git a/lib/ReaderWriter/PECOFF/PECOFFLinkingContext.cpp b/lib/ReaderWriter/PECOFF/PECOFFLinkingContext.cpp deleted file mode 100644 index 6a657e33541d..000000000000 --- a/lib/ReaderWriter/PECOFF/PECOFFLinkingContext.cpp +++ /dev/null @@ -1,352 +0,0 @@ -//===- lib/ReaderWriter/PECOFF/PECOFFLinkingContext.cpp -------------------===// -// -// The LLVM Linker -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// - -#include "Atoms.h" -#include "EdataPass.h" -#include "IdataPass.h" -#include "InferSubsystemPass.h" -#include "LinkerGeneratedSymbolFile.h" -#include "LoadConfigPass.h" -#include "OrderPass.h" -#include "PDBPass.h" -#include "lld/Core/PassManager.h" -#include "lld/Core/Reader.h" -#include "lld/Core/Simple.h" -#include "lld/Core/Writer.h" -#include "lld/ReaderWriter/PECOFFLinkingContext.h" -#include "llvm/ADT/STLExtras.h" -#include "llvm/ADT/SmallString.h" -#include "llvm/Support/Allocator.h" -#include "llvm/Support/Path.h" -#include <bitset> -#include <climits> -#include <set> - -namespace lld { - -bool PECOFFLinkingContext::validateImpl(raw_ostream &diagnostics) { - if (_stackReserve < _stackCommit) { - diagnostics << "Invalid stack size: reserve size must be equal to or " - << "greater than commit size, but got " << _stackCommit - << " and " << _stackReserve << ".\n"; - return false; - } - - if (_heapReserve < _heapCommit) { - diagnostics << "Invalid heap size: reserve size must be equal to or " - << "greater than commit size, but got " << _heapCommit - << " and " << _heapReserve << ".\n"; - return false; - } - - // It's an error if the base address is not multiple of 64K. - if (getBaseAddress() & 0xffff) { - diagnostics << "Base address have to be multiple of 64K, but got " - << getBaseAddress() << "\n"; - return false; - } - - // Specifing /noentry without /dll is an error. - if (!hasEntry() && !isDll()) { - diagnostics << "/noentry must be specified with /dll\n"; - return false; - } - - // Check for duplicate export ordinals. - std::set<int> exports; - for (const PECOFFLinkingContext::ExportDesc &desc : getDllExports()) { - if (desc.ordinal == -1) - continue; - if (exports.count(desc.ordinal) == 1) { - diagnostics << "Duplicate export ordinals: " << desc.ordinal << "\n"; - return false; - } - exports.insert(desc.ordinal); - } - - // Check for /align. - std::bitset<64> alignment(_sectionDefaultAlignment); - if (alignment.count() != 1) { - diagnostics << "Section alignment must be a power of 2, but got " - << _sectionDefaultAlignment << "\n"; - return false; - } - - _writer = createWriterPECOFF(*this); - return true; -} - -const std::set<std::string> &PECOFFLinkingContext::definedSymbols() { - std::lock_guard<std::recursive_mutex> lock(_mutex); - for (std::unique_ptr<Node> &node : getNodes()) { - if (_seen.count(node.get()) > 0) - continue; - FileNode *fnode = dyn_cast<FileNode>(node.get()); - if (!fnode) - continue; - File *file = fnode->getFile(); - if (file->parse()) - continue; - if (auto *archive = dyn_cast<ArchiveLibraryFile>(file)) { - for (const std::string &sym : archive->getDefinedSymbols()) - _definedSyms.insert(sym); - continue; - } - for (const DefinedAtom *atom : file->defined()) - if (!atom->name().empty()) - _definedSyms.insert(atom->name()); - } - return _definedSyms; -} - -std::unique_ptr<File> PECOFFLinkingContext::createEntrySymbolFile() const { - return LinkingContext::createEntrySymbolFile("<command line option /entry>"); -} - -std::unique_ptr<File> PECOFFLinkingContext::createUndefinedSymbolFile() const { - return LinkingContext::createUndefinedSymbolFile( - "<command line option /include>"); -} - -static int getGroupStartPos(std::vector<std::unique_ptr<Node>> &nodes) { - for (int i = 0, e = nodes.size(); i < e; ++i) - if (GroupEnd *group = dyn_cast<GroupEnd>(nodes[i].get())) - return i - group->getSize(); - llvm::report_fatal_error("internal error"); -} - -void PECOFFLinkingContext::addLibraryFile(std::unique_ptr<FileNode> file) { - GroupEnd *currentGroupEnd; - int pos = -1; - std::vector<std::unique_ptr<Node>> &elements = getNodes(); - for (int i = 0, e = elements.size(); i < e; ++i) { - if ((currentGroupEnd = dyn_cast<GroupEnd>(elements[i].get()))) { - pos = i; - break; - } - } - assert(pos >= 0); - elements.insert(elements.begin() + pos, std::move(file)); - elements[pos + 1] = llvm::make_unique<GroupEnd>( - currentGroupEnd->getSize() + 1); -} - -bool PECOFFLinkingContext::createImplicitFiles( - std::vector<std::unique_ptr<File>> &) { - std::vector<std::unique_ptr<Node>> &members = getNodes(); - - // Create a file for the entry point function. - std::unique_ptr<FileNode> entry(new FileNode( - llvm::make_unique<pecoff::EntryPointFile>(*this))); - members.insert(members.begin() + getGroupStartPos(members), std::move(entry)); - - // Create a file for __ImageBase. - std::unique_ptr<FileNode> fileNode(new FileNode( - llvm::make_unique<pecoff::LinkerGeneratedSymbolFile>(*this))); - members.push_back(std::move(fileNode)); - - // Create a file for _imp_ symbols. - std::unique_ptr<FileNode> impFileNode(new FileNode( - llvm::make_unique<pecoff::LocallyImportedSymbolFile>(*this))); - members.push_back(std::move(impFileNode)); - - // Create a file for dllexported symbols. - std::unique_ptr<FileNode> exportNode(new FileNode( - llvm::make_unique<pecoff::ExportedSymbolRenameFile>(*this))); - addLibraryFile(std::move(exportNode)); - - return true; -} - -/// Returns the section name in the resulting executable. -/// -/// Sections in object files are usually output to the executable with the same -/// name, but you can rename by command line option. /merge:from=to makes the -/// linker to combine "from" section contents to "to" section in the -/// executable. We have a mapping for the renaming. This method looks up the -/// table and returns a new section name if renamed. -StringRef -PECOFFLinkingContext::getOutputSectionName(StringRef sectionName) const { - auto it = _renamedSections.find(sectionName); - if (it == _renamedSections.end()) - return sectionName; - return getOutputSectionName(it->second); -} - -/// Adds a mapping to the section renaming table. This method will be used for -/// /merge command line option. -bool PECOFFLinkingContext::addSectionRenaming(raw_ostream &diagnostics, - StringRef from, StringRef to) { - auto it = _renamedSections.find(from); - if (it != _renamedSections.end()) { - if (it->second == to) - // There's already the same mapping. - return true; - diagnostics << "Section \"" << from << "\" is already mapped to \"" - << it->second << ", so it cannot be mapped to \"" << to << "\"."; - return true; - } - - // Add a mapping, and check if there's no cycle in the renaming mapping. The - // cycle detection algorithm we use here is naive, but that's OK because the - // number of mapping is usually less than 10. - _renamedSections[from] = to; - for (auto elem : _renamedSections) { - StringRef sectionName = elem.first; - std::set<StringRef> visited; - visited.insert(sectionName); - for (;;) { - auto pos = _renamedSections.find(sectionName); - if (pos == _renamedSections.end()) - break; - if (visited.count(pos->second)) { - diagnostics << "/merge:" << from << "=" << to << " makes a cycle"; - return false; - } - sectionName = pos->second; - visited.insert(sectionName); - } - } - return true; -} - -/// Try to find the input library file from the search paths and append it to -/// the input file list. Returns true if the library file is found. -StringRef PECOFFLinkingContext::searchLibraryFile(StringRef filename) const { - // Current directory always takes precedence over the search paths. - if (llvm::sys::path::is_absolute(filename) || llvm::sys::fs::exists(filename)) - return filename; - // Iterate over the search paths. - for (StringRef dir : _inputSearchPaths) { - SmallString<128> path = dir; - llvm::sys::path::append(path, filename); - if (llvm::sys::fs::exists(path.str())) - return allocate(path.str()); - } - return filename; -} - -/// Returns the decorated name of the given symbol name. On 32-bit x86, it -/// adds "_" at the beginning of the string. On other architectures, the -/// return value is the same as the argument. -StringRef PECOFFLinkingContext::decorateSymbol(StringRef name) const { - if (_machineType != llvm::COFF::IMAGE_FILE_MACHINE_I386) - return name; - std::string str = "_"; - str.append(name); - return allocate(str); -} - -StringRef PECOFFLinkingContext::undecorateSymbol(StringRef name) const { - if (_machineType != llvm::COFF::IMAGE_FILE_MACHINE_I386) - return name; - if (!name.startswith("_")) - return name; - return name.substr(1); -} - -uint64_t PECOFFLinkingContext::getBaseAddress() const { - if (_baseAddress == invalidBaseAddress) - return is64Bit() ? pe32PlusDefaultBaseAddress : pe32DefaultBaseAddress; - return _baseAddress; -} - -Writer &PECOFFLinkingContext::writer() const { return *_writer; } - -void PECOFFLinkingContext::setSectionSetMask(StringRef sectionName, - uint32_t newFlags) { - _sectionSetMask[sectionName] |= newFlags; - _sectionClearMask[sectionName] &= ~newFlags; - const uint32_t rwx = (llvm::COFF::IMAGE_SCN_MEM_READ | - llvm::COFF::IMAGE_SCN_MEM_WRITE | - llvm::COFF::IMAGE_SCN_MEM_EXECUTE); - if (newFlags & rwx) - _sectionClearMask[sectionName] |= ~_sectionSetMask[sectionName] & rwx; - assert((_sectionSetMask[sectionName] & _sectionClearMask[sectionName]) == 0); -} - -void PECOFFLinkingContext::setSectionClearMask(StringRef sectionName, - uint32_t newFlags) { - _sectionClearMask[sectionName] |= newFlags; - _sectionSetMask[sectionName] &= ~newFlags; - assert((_sectionSetMask[sectionName] & _sectionClearMask[sectionName]) == 0); -} - -uint32_t PECOFFLinkingContext::getSectionAttributes(StringRef sectionName, - uint32_t flags) const { - auto si = _sectionSetMask.find(sectionName); - uint32_t setMask = (si == _sectionSetMask.end()) ? 0 : si->second; - auto ci = _sectionClearMask.find(sectionName); - uint32_t clearMask = (ci == _sectionClearMask.end()) ? 0 : ci->second; - return (flags | setMask) & ~clearMask; -} - -// Returns true if two export descriptors are the same. -static bool sameExportDesc(const PECOFFLinkingContext::ExportDesc &a, - const PECOFFLinkingContext::ExportDesc &b) { - return a.ordinal == b.ordinal && a.ordinal == b.ordinal && - a.noname == b.noname && a.isData == b.isData; -} - -void PECOFFLinkingContext::addDllExport(ExportDesc &desc) { - addInitialUndefinedSymbol(allocate(desc.name)); - - // MSVC link.exe silently drops characters after the first atsign. - // For example, /export:foo@4=bar is equivalent to /export:foo=bar. - // We do the same thing for compatibility. - if (!desc.externalName.empty()) { - StringRef s(desc.externalName); - size_t pos = s.find('@'); - if (pos != s.npos) - desc.externalName = s.substr(0, pos); - } - - // Scan the vector to look for existing entry. It's not very fast, - // but because the number of exported symbol is usually not that - // much, it should be okay. - for (ExportDesc &e : _dllExports) { - if (e.name != desc.name) - continue; - if (!sameExportDesc(e, desc)) - llvm::errs() << "Export symbol '" << desc.name - << "' specified more than once.\n"; - return; - } - _dllExports.push_back(desc); -} - -static std::string replaceExtension(StringRef path, StringRef ext) { - SmallString<128> ss = path; - llvm::sys::path::replace_extension(ss, ext); - return ss.str(); -} - -std::string PECOFFLinkingContext::getOutputImportLibraryPath() const { - if (!_implib.empty()) - return _implib; - return replaceExtension(outputPath(), ".lib"); -} - -std::string PECOFFLinkingContext::getPDBFilePath() const { - assert(_debug); - if (!_pdbFilePath.empty()) - return _pdbFilePath; - return replaceExtension(outputPath(), ".pdb"); -} - -void PECOFFLinkingContext::addPasses(PassManager &pm) { - pm.add(llvm::make_unique<pecoff::PDBPass>(*this)); - pm.add(llvm::make_unique<pecoff::EdataPass>(*this)); - pm.add(llvm::make_unique<pecoff::IdataPass>(*this)); - pm.add(llvm::make_unique<pecoff::OrderPass>()); - pm.add(llvm::make_unique<pecoff::LoadConfigPass>(*this)); - pm.add(llvm::make_unique<pecoff::InferSubsystemPass>(*this)); -} - -} // end namespace lld |