forked from OSchip/llvm-project
316 lines
8.3 KiB
C++
316 lines
8.3 KiB
C++
//===- lib/ReaderWriter/MachO/MachOLinkingContext.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 "lld/ReaderWriter/MachOLinkingContext.h"
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#include "GOTPass.hpp"
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#include "StubsPass.hpp"
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#include "ReferenceKinds.h"
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#include "lld/Core/PassManager.h"
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#include "lld/ReaderWriter/Reader.h"
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#include "lld/ReaderWriter/Writer.h"
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#include "lld/Passes/LayoutPass.h"
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#include "lld/Passes/RoundTripYAMLPass.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/MachO.h"
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using lld::mach_o::KindHandler;
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using namespace llvm::MachO;
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namespace lld {
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bool MachOLinkingContext::parsePackedVersion(StringRef str, uint32_t &result) {
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result = 0;
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if (str.empty())
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return false;
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SmallVector<StringRef, 3> parts;
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llvm::SplitString(str, parts, ".");
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unsigned long long num;
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if (llvm::getAsUnsignedInteger(parts[0], 10, num))
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return true;
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if (num > 65535)
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return true;
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result = num << 16;
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if (parts.size() > 1) {
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if (llvm::getAsUnsignedInteger(parts[1], 10, num))
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return true;
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if (num > 255)
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return true;
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result |= (num << 8);
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}
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if (parts.size() > 2) {
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if (llvm::getAsUnsignedInteger(parts[2], 10, num))
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return true;
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if (num > 255)
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return true;
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result |= num;
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}
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return false;
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}
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MachOLinkingContext::ArchInfo MachOLinkingContext::_s_archInfos[] = {
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{ "x86_64", arch_x86_64, true, CPU_TYPE_X86_64, CPU_SUBTYPE_X86_64_ALL },
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{ "i386", arch_x86, true, CPU_TYPE_I386, CPU_SUBTYPE_X86_ALL },
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{ "ppc", arch_ppc, false, CPU_TYPE_POWERPC, CPU_SUBTYPE_POWERPC_ALL },
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{ "armv6", arch_armv6, true, CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V6 },
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{ "armv7", arch_armv7, true, CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7 },
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{ "armv7s", arch_armv7s, true, CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7S },
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{ "", arch_unknown,false, 0, 0 }
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};
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MachOLinkingContext::Arch
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MachOLinkingContext::archFromCpuType(uint32_t cputype, uint32_t cpusubtype) {
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for (ArchInfo *info = _s_archInfos; !info->archName.empty(); ++info) {
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if ((info->cputype == cputype) && (info->cpusubtype == cpusubtype))
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return info->arch;
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}
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return arch_unknown;
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}
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MachOLinkingContext::Arch
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MachOLinkingContext::archFromName(StringRef archName) {
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for (ArchInfo *info = _s_archInfos; !info->archName.empty(); ++info) {
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if (info->archName.equals(archName))
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return info->arch;
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}
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return arch_unknown;
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}
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StringRef MachOLinkingContext::nameFromArch(Arch arch) {
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for (ArchInfo *info = _s_archInfos; !info->archName.empty(); ++info) {
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if (info->arch == arch)
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return info->archName;
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}
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return "<unknown>";
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}
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uint32_t MachOLinkingContext::cpuTypeFromArch(Arch arch) {
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assert(arch != arch_unknown);
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for (ArchInfo *info = _s_archInfos; !info->archName.empty(); ++info) {
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if (info->arch == arch)
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return info->cputype;
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}
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llvm_unreachable("Unknown arch type");
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}
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uint32_t MachOLinkingContext::cpuSubtypeFromArch(Arch arch) {
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assert(arch != arch_unknown);
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for (ArchInfo *info = _s_archInfos; !info->archName.empty(); ++info) {
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if (info->arch == arch)
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return info->cpusubtype;
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}
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llvm_unreachable("Unknown arch type");
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}
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MachOLinkingContext::MachOLinkingContext()
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: _outputFileType(MH_EXECUTE), _outputFileTypeStatic(false),
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_doNothing(false), _arch(arch_unknown), _os(OS::macOSX), _osMinVersion(0),
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_pageZeroSize(0), _pageSize(4096), _compatibilityVersion(0),
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_currentVersion(0), _deadStrippableDylib(false), _kindHandler(nullptr) {}
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MachOLinkingContext::~MachOLinkingContext() {}
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void MachOLinkingContext::configure(HeaderFileType type, Arch arch, OS os,
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uint32_t minOSVersion) {
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_outputFileType = type;
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_arch = arch;
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_os = os;
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_osMinVersion = minOSVersion;
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switch (_outputFileType) {
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case llvm::MachO::MH_EXECUTE:
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// If targeting newer OS, use _main
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if (minOS("10.8", "6.0")) {
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_entrySymbolName = "_main";
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} else {
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// If targeting older OS, use start (in crt1.o)
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_entrySymbolName = "start";
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}
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// __PAGEZERO defaults to 4GB on 64-bit (except for PP64 which lld does not
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// support) and 4KB on 32-bit.
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if (is64Bit(_arch)) {
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_pageZeroSize = 0x100000000;
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} else {
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_pageZeroSize = 0x1000;
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}
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break;
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case llvm::MachO::MH_DYLIB:
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_globalsAreDeadStripRoots = true;
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break;
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case llvm::MachO::MH_BUNDLE:
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break;
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case llvm::MachO::MH_OBJECT:
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_printRemainingUndefines = false;
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_allowRemainingUndefines = true;
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default:
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break;
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}
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}
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uint32_t MachOLinkingContext::getCPUType() const {
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return cpuTypeFromArch(_arch);
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}
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uint32_t MachOLinkingContext::getCPUSubType() const {
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return cpuSubtypeFromArch(_arch);
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}
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bool MachOLinkingContext::is64Bit(Arch arch) {
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for (ArchInfo *info = _s_archInfos; !info->archName.empty(); ++info) {
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if (info->arch == arch) {
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return (info->cputype & CPU_ARCH_ABI64);
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}
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}
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// unknown archs are not 64-bit.
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return false;
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}
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bool MachOLinkingContext::isHostEndian(Arch arch) {
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assert(arch != arch_unknown);
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for (ArchInfo *info = _s_archInfos; !info->archName.empty(); ++info) {
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if (info->arch == arch) {
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return (info->littleEndian == llvm::sys::IsLittleEndianHost);
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}
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}
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llvm_unreachable("Unknown arch type");
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}
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bool MachOLinkingContext::isBigEndian(Arch arch) {
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assert(arch != arch_unknown);
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for (ArchInfo *info = _s_archInfos; !info->archName.empty(); ++info) {
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if (info->arch == arch) {
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return ! info->littleEndian;
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}
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}
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llvm_unreachable("Unknown arch type");
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}
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bool MachOLinkingContext::is64Bit() const {
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return is64Bit(_arch);
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}
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bool MachOLinkingContext::outputTypeHasEntry() const {
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switch (_outputFileType) {
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case MH_EXECUTE:
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case MH_DYLINKER:
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case MH_PRELOAD:
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return true;
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default:
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return false;
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}
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}
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bool MachOLinkingContext::minOS(StringRef mac, StringRef iOS) const {
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uint32_t parsedVersion;
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switch (_os) {
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case OS::macOSX:
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if (parsePackedVersion(mac, parsedVersion))
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return false;
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return _osMinVersion >= parsedVersion;
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case OS::iOS:
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case OS::iOS_simulator:
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if (parsePackedVersion(iOS, parsedVersion))
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return false;
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return _osMinVersion >= parsedVersion;
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case OS::unknown:
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break;
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}
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llvm_unreachable("target not configured for iOS or MacOSX");
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}
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bool MachOLinkingContext::addEntryPointLoadCommand() const {
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if ((_outputFileType == MH_EXECUTE) && !_outputFileTypeStatic) {
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return minOS("10.8", "6.0");
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}
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return false;
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}
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bool MachOLinkingContext::addUnixThreadLoadCommand() const {
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switch (_outputFileType) {
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case MH_EXECUTE:
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if (_outputFileTypeStatic)
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return true;
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else
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return !minOS("10.8", "6.0");
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break;
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case MH_DYLINKER:
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case MH_PRELOAD:
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return true;
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default:
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return false;
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}
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}
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bool MachOLinkingContext::validateImpl(raw_ostream &diagnostics) {
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// TODO: if -arch not specified, look at arch of first .o file.
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if (_currentVersion && _outputFileType != MH_DYLIB) {
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diagnostics << "error: -current_version can only be used with dylibs\n";
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return false;
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}
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if (_compatibilityVersion && _outputFileType != MH_DYLIB) {
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diagnostics
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<< "error: -compatibility_version can only be used with dylibs\n";
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return false;
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}
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if (_deadStrippableDylib && _outputFileType != MH_DYLIB) {
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diagnostics
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<< "error: -mark_dead_strippable_dylib can only be used with dylibs.\n";
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return false;
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}
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if (!_bundleLoader.empty() && outputFileType() != MH_BUNDLE) {
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diagnostics
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<< "error: -bundle_loader can only be used with Mach-O bundles\n";
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return false;
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}
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return true;
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}
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void MachOLinkingContext::addPasses(PassManager &pm) {
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if (outputFileType() != MH_OBJECT) {
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pm.add(std::unique_ptr<Pass>(new mach_o::GOTPass));
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pm.add(std::unique_ptr<Pass>(new mach_o::StubsPass(*this)));
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}
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pm.add(std::unique_ptr<Pass>(new LayoutPass()));
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}
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Writer &MachOLinkingContext::writer() const {
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if (!_writer) {
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_writer = createWriterMachO(*this);
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}
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return *_writer;
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}
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KindHandler &MachOLinkingContext::kindHandler() const {
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if (!_kindHandler)
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_kindHandler = KindHandler::create(_arch);
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return *_kindHandler;
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}
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} // end namespace lld
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