forked from OSchip/llvm-project
279 lines
10 KiB
C++
279 lines
10 KiB
C++
//===- lib/ReaderWriter/PECOFF/PECOFFLinkingContext.cpp -------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "Atoms.h"
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#include "EdataPass.h"
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#include "GroupedSectionsPass.h"
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#include "IdataPass.h"
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#include "LinkerGeneratedSymbolFile.h"
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#include "LoadConfigPass.h"
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#include "SetSubsystemPass.h"
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#include "lld/Core/PassManager.h"
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#include "lld/Passes/LayoutPass.h"
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#include "lld/Passes/RoundTripNativePass.h"
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#include "lld/Passes/RoundTripYAMLPass.h"
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#include "lld/ReaderWriter/PECOFFLinkingContext.h"
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#include "lld/ReaderWriter/Reader.h"
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#include "lld/ReaderWriter/Simple.h"
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#include "lld/ReaderWriter/Writer.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/Allocator.h"
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#include "llvm/Support/Path.h"
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#include <bitset>
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#include <climits>
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#include <set>
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namespace lld {
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bool PECOFFLinkingContext::validateImpl(raw_ostream &diagnostics) {
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if (_stackReserve < _stackCommit) {
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diagnostics << "Invalid stack size: reserve size must be equal to or "
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<< "greater than commit size, but got " << _stackCommit
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<< " and " << _stackReserve << ".\n";
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return false;
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}
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if (_heapReserve < _heapCommit) {
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diagnostics << "Invalid heap size: reserve size must be equal to or "
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<< "greater than commit size, but got " << _heapCommit
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<< " and " << _heapReserve << ".\n";
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return false;
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}
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// It's an error if the base address is not multiple of 64K.
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if (getBaseAddress() & 0xffff) {
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diagnostics << "Base address have to be multiple of 64K, but got "
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<< getBaseAddress() << "\n";
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return false;
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}
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// Check for duplicate export ordinals.
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std::set<int> exports;
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for (const PECOFFLinkingContext::ExportDesc &desc : getDllExports()) {
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if (desc.ordinal == -1)
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continue;
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if (exports.count(desc.ordinal) == 1) {
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diagnostics << "Duplicate export ordinals: " << desc.ordinal << "\n";
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return false;
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}
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exports.insert(desc.ordinal);
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}
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// Check for /align.
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std::bitset<64> alignment(_sectionDefaultAlignment);
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if (alignment.count() != 1) {
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diagnostics << "Section alignment must be a power of 2, but got "
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<< _sectionDefaultAlignment << "\n";
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return false;
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}
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// /safeseh is only valid for x86.
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if (getMachineType() != llvm::COFF::IMAGE_FILE_MACHINE_I386 && noSEH()) {
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diagnostics << "/SAFESEH:NO is only valid for x86.\n";
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return false;
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}
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// Architectures other than x86/x64 is not supported yet.
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if (_machineType != llvm::COFF::IMAGE_FILE_MACHINE_I386 &&
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_machineType != llvm::COFF::IMAGE_FILE_MACHINE_AMD64) {
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diagnostics << "Machine type other than x86/x64 is not supported.\n";
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return false;
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}
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_writer = createWriterPECOFF(*this);
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return true;
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}
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std::unique_ptr<File> PECOFFLinkingContext::createEntrySymbolFile() const {
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return LinkingContext::createEntrySymbolFile("command line option /entry");
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}
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std::unique_ptr<File> PECOFFLinkingContext::createUndefinedSymbolFile() const {
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return LinkingContext::createUndefinedSymbolFile("command line option /include");
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}
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bool PECOFFLinkingContext::createImplicitFiles(
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std::vector<std::unique_ptr<File> > &) const {
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std::unique_ptr<SimpleFileNode> fileNode(
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new SimpleFileNode("Implicit Files"));
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std::unique_ptr<File> linkerGeneratedSymFile(
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new pecoff::LinkerGeneratedSymbolFile(*this));
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fileNode->appendInputFile(std::move(linkerGeneratedSymFile));
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inputGraph().insertOneElementAt(std::move(fileNode),
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InputGraph::Position::END);
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return true;
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}
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/// Returns the section name in the resulting executable.
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///
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/// Sections in object files are usually output to the executable with the same
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/// name, but you can rename by command line option. /merge:from=to makes the
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/// linker to combine "from" section contents to "to" section in the
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/// executable. We have a mapping for the renaming. This method looks up the
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/// table and returns a new section name if renamed.
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StringRef
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PECOFFLinkingContext::getOutputSectionName(StringRef sectionName) const {
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auto it = _renamedSections.find(sectionName);
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if (it == _renamedSections.end())
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return sectionName;
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return getOutputSectionName(it->second);
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}
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/// Adds a mapping to the section renaming table. This method will be used for
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/// /merge command line option.
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bool PECOFFLinkingContext::addSectionRenaming(raw_ostream &diagnostics,
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StringRef from, StringRef to) {
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auto it = _renamedSections.find(from);
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if (it != _renamedSections.end()) {
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if (it->second == to)
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// There's already the same mapping.
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return true;
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diagnostics << "Section \"" << from << "\" is already mapped to \""
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<< it->second << ", so it cannot be mapped to \"" << to << "\".";
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return true;
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}
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// Add a mapping, and check if there's no cycle in the renaming mapping. The
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// cycle detection algorithm we use here is naive, but that's OK because the
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// number of mapping is usually less than 10.
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_renamedSections[from] = to;
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for (auto elem : _renamedSections) {
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StringRef sectionName = elem.first;
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std::set<StringRef> visited;
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visited.insert(sectionName);
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for (;;) {
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auto pos = _renamedSections.find(sectionName);
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if (pos == _renamedSections.end())
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break;
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if (visited.count(pos->second)) {
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diagnostics << "/merge:" << from << "=" << to << " makes a cycle";
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return false;
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}
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sectionName = pos->second;
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visited.insert(sectionName);
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}
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}
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return true;
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}
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StringRef PECOFFLinkingContext::getAlternateName(StringRef def) const {
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auto it = _alternateNames.find(def);
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if (it == _alternateNames.end())
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return "";
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return it->second;
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}
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void PECOFFLinkingContext::setAlternateName(StringRef weak, StringRef def) {
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_alternateNames[def] = weak;
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}
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/// Try to find the input library file from the search paths and append it to
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/// the input file list. Returns true if the library file is found.
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StringRef PECOFFLinkingContext::searchLibraryFile(StringRef filename) const {
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// Current directory always takes precedence over the search paths.
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if (llvm::sys::path::is_absolute(filename) || llvm::sys::fs::exists(filename))
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return filename;
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// Iterate over the search paths.
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for (StringRef dir : _inputSearchPaths) {
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SmallString<128> path = dir;
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llvm::sys::path::append(path, filename);
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if (llvm::sys::fs::exists(path.str()))
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return allocate(path.str());
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}
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return filename;
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}
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/// Returns the decorated name of the given symbol name. On 32-bit x86, it
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/// adds "_" at the beginning of the string. On other architectures, the
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/// return value is the same as the argument.
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StringRef PECOFFLinkingContext::decorateSymbol(StringRef name) const {
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if (_machineType != llvm::COFF::IMAGE_FILE_MACHINE_I386)
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return name;
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std::string str = "_";
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str.append(name);
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return allocate(str);
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}
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StringRef PECOFFLinkingContext::undecorateSymbol(StringRef name) const {
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if (_machineType != llvm::COFF::IMAGE_FILE_MACHINE_I386)
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return name;
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assert(name.startswith("_"));
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return name.substr(1);
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}
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uint64_t PECOFFLinkingContext::getBaseAddress() const {
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if (_baseAddress == invalidBaseAddress)
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return is64Bit() ? pe32PlusDefaultBaseAddress : pe32DefaultBaseAddress;
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return _baseAddress;
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}
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Writer &PECOFFLinkingContext::writer() const { return *_writer; }
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void PECOFFLinkingContext::setSectionSetMask(StringRef sectionName,
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uint32_t newFlags) {
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_sectionSetMask[sectionName] |= newFlags;
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_sectionClearMask[sectionName] &= ~newFlags;
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const uint32_t rwx = (llvm::COFF::IMAGE_SCN_MEM_READ |
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llvm::COFF::IMAGE_SCN_MEM_WRITE |
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llvm::COFF::IMAGE_SCN_MEM_EXECUTE);
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if (newFlags & rwx)
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_sectionClearMask[sectionName] |= ~_sectionSetMask[sectionName] & rwx;
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assert((_sectionSetMask[sectionName] & _sectionClearMask[sectionName]) == 0);
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}
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void PECOFFLinkingContext::setSectionClearMask(StringRef sectionName,
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uint32_t newFlags) {
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_sectionClearMask[sectionName] |= newFlags;
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_sectionSetMask[sectionName] &= ~newFlags;
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assert((_sectionSetMask[sectionName] & _sectionClearMask[sectionName]) == 0);
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}
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uint32_t PECOFFLinkingContext::getSectionAttributes(StringRef sectionName,
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uint32_t flags) const {
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auto si = _sectionSetMask.find(sectionName);
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uint32_t setMask = (si == _sectionSetMask.end()) ? 0 : si->second;
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auto ci = _sectionClearMask.find(sectionName);
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uint32_t clearMask = (ci == _sectionClearMask.end()) ? 0 : ci->second;
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return (flags | setMask) & ~clearMask;
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}
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// Returns true if two export descriptors have conflicting contents,
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// e.g. different export ordinals.
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static bool exportConflicts(const PECOFFLinkingContext::ExportDesc &a,
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const PECOFFLinkingContext::ExportDesc &b) {
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return (a.ordinal > 0 && b.ordinal > 0 && a.ordinal != b.ordinal) ||
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a.noname != b.noname || a.isData != b.isData;
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}
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void PECOFFLinkingContext::addDllExport(ExportDesc &desc) {
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auto existing = _dllExports.insert(desc);
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if (existing.second)
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return;
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if (!exportConflicts(*existing.first, desc)) {
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_dllExports.erase(existing.first);
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_dllExports.insert(desc);
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return;
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}
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llvm::errs() << "Export symbol '" << desc.name
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<< "' specified more than once.\n";
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}
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void PECOFFLinkingContext::addPasses(PassManager &pm) {
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pm.add(std::unique_ptr<Pass>(new pecoff::SetSubsystemPass(*this)));
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pm.add(std::unique_ptr<Pass>(new pecoff::EdataPass(*this)));
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pm.add(std::unique_ptr<Pass>(new pecoff::IdataPass(*this)));
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pm.add(std::unique_ptr<Pass>(new LayoutPass(registry())));
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pm.add(std::unique_ptr<Pass>(new pecoff::LoadConfigPass(*this)));
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pm.add(std::unique_ptr<Pass>(new pecoff::GroupedSectionsPass()));
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}
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} // end namespace lld
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