forked from OSchip/llvm-project
318 lines
9.4 KiB
C++
318 lines
9.4 KiB
C++
//===- Config.h -------------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLD_ELF_CONFIG_H
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#define LLD_ELF_CONFIG_H
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#include "lld/Common/ErrorHandler.h"
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#include "llvm/ADT/MapVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/StringSet.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/Support/CachePruning.h"
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#include "llvm/Support/CodeGen.h"
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#include "llvm/Support/Endian.h"
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#include <atomic>
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#include <vector>
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namespace lld {
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namespace elf {
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class InputFile;
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class InputSectionBase;
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enum ELFKind {
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ELFNoneKind,
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ELF32LEKind,
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ELF32BEKind,
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ELF64LEKind,
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ELF64BEKind
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};
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// For --build-id.
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enum class BuildIdKind { None, Fast, Md5, Sha1, Hexstring, Uuid };
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// For --discard-{all,locals,none}.
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enum class DiscardPolicy { Default, All, Locals, None };
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// For --icf={none,safe,all}.
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enum class ICFLevel { None, Safe, All };
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// For --strip-{all,debug}.
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enum class StripPolicy { None, All, Debug };
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// For --unresolved-symbols.
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enum class UnresolvedPolicy { ReportError, Warn, Ignore };
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// For --orphan-handling.
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enum class OrphanHandlingPolicy { Place, Warn, Error };
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// For --sort-section and linkerscript sorting rules.
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enum class SortSectionPolicy { Default, None, Alignment, Name, Priority };
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// For --target2
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enum class Target2Policy { Abs, Rel, GotRel };
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// For tracking ARM Float Argument PCS
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enum class ARMVFPArgKind { Default, Base, VFP, ToolChain };
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struct SymbolVersion {
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llvm::StringRef Name;
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bool IsExternCpp;
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bool HasWildcard;
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};
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// This struct contains symbols version definition that
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// can be found in version script if it is used for link.
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struct VersionDefinition {
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llvm::StringRef Name;
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uint16_t Id = 0;
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std::vector<SymbolVersion> Globals;
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size_t NameOff = 0; // Offset in the string table
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};
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// This struct contains the global configuration for the linker.
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// Most fields are direct mapping from the command line options
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// and such fields have the same name as the corresponding options.
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// Most fields are initialized by the driver.
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struct Configuration {
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uint8_t OSABI = 0;
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llvm::CachePruningPolicy ThinLTOCachePolicy;
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llvm::StringMap<uint64_t> SectionStartMap;
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llvm::StringRef Chroot;
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llvm::StringRef DynamicLinker;
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llvm::StringRef DwoDir;
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llvm::StringRef Entry;
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llvm::StringRef Emulation;
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llvm::StringRef Fini;
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llvm::StringRef Init;
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llvm::StringRef LTOAAPipeline;
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llvm::StringRef LTOCSProfileFile;
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llvm::StringRef LTONewPmPasses;
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llvm::StringRef LTOObjPath;
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llvm::StringRef LTOSampleProfile;
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llvm::StringRef MapFile;
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llvm::StringRef OutputFile;
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llvm::StringRef OptRemarksFilename;
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llvm::StringRef OptRemarksPasses;
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llvm::StringRef ProgName;
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llvm::StringRef PrintSymbolOrder;
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llvm::StringRef SoName;
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llvm::StringRef Sysroot;
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llvm::StringRef ThinLTOCacheDir;
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llvm::StringRef ThinLTOIndexOnlyArg;
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std::pair<llvm::StringRef, llvm::StringRef> ThinLTOObjectSuffixReplace;
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std::pair<llvm::StringRef, llvm::StringRef> ThinLTOPrefixReplace;
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std::string Rpath;
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std::vector<VersionDefinition> VersionDefinitions;
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std::vector<llvm::StringRef> AuxiliaryList;
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std::vector<llvm::StringRef> FilterList;
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std::vector<llvm::StringRef> SearchPaths;
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std::vector<llvm::StringRef> SymbolOrderingFile;
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std::vector<llvm::StringRef> Undefined;
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std::vector<SymbolVersion> DynamicList;
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std::vector<SymbolVersion> VersionScriptGlobals;
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std::vector<SymbolVersion> VersionScriptLocals;
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std::vector<uint8_t> BuildIdVector;
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llvm::MapVector<std::pair<const InputSectionBase *, const InputSectionBase *>,
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uint64_t>
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CallGraphProfile;
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bool AllowMultipleDefinition;
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bool AllowShlibUndefined;
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bool AndroidPackDynRelocs;
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bool ARMHasBlx = false;
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bool ARMHasMovtMovw = false;
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bool ARMJ1J2BranchEncoding = false;
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bool AsNeeded = false;
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bool Bsymbolic;
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bool BsymbolicFunctions;
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bool CallGraphProfileSort;
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bool CheckSections;
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bool CompressDebugSections;
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bool Cref;
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bool DefineCommon;
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bool Demangle = true;
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bool DependentLibraries;
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bool DisableVerify;
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bool EhFrameHdr;
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bool EmitLLVM;
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bool EmitRelocs;
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bool EnableNewDtags;
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bool ExecuteOnly;
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bool ExportDynamic;
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bool FixCortexA53Errata843419;
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bool FormatBinary = false;
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bool GcSections;
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bool GdbIndex;
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bool GnuHash = false;
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bool GnuUnique;
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bool HasDynamicList = false;
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bool HasDynSymTab;
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bool IgnoreDataAddressEquality;
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bool IgnoreFunctionAddressEquality;
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bool LTOCSProfileGenerate;
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bool LTODebugPassManager;
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bool LTONewPassManager;
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bool MergeArmExidx;
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bool MipsN32Abi = false;
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bool Nmagic;
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bool NoinhibitExec;
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bool Nostdlib;
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bool OFormatBinary;
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bool Omagic;
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bool OptRemarksWithHotness;
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bool PicThunk;
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bool Pie;
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bool PrintGcSections;
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bool PrintIcfSections;
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bool Relocatable;
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bool RelrPackDynRelocs;
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bool SaveTemps;
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bool SingleRoRx;
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bool Shared;
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bool Static = false;
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bool SysvHash = false;
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bool Target1Rel;
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bool Trace;
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bool ThinLTOEmitImportsFiles;
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bool ThinLTOIndexOnly;
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bool TocOptimize;
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bool UndefinedVersion;
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bool UseAndroidRelrTags = false;
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bool WarnBackrefs;
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bool WarnCommon;
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bool WarnIfuncTextrel;
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bool WarnMissingEntry;
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bool WarnSymbolOrdering;
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bool WriteAddends;
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bool ZCombreloc;
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bool ZCopyreloc;
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bool ZExecstack;
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bool ZGlobal;
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bool ZHazardplt;
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bool ZIfuncNoplt;
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bool ZInitfirst;
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bool ZInterpose;
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bool ZKeepTextSectionPrefix;
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bool ZNodefaultlib;
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bool ZNodelete;
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bool ZNodlopen;
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bool ZNow;
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bool ZOrigin;
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bool ZRelro;
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bool ZRodynamic;
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bool ZText;
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bool ZRetpolineplt;
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bool ZWxneeded;
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DiscardPolicy Discard;
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ICFLevel ICF;
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OrphanHandlingPolicy OrphanHandling;
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SortSectionPolicy SortSection;
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StripPolicy Strip;
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UnresolvedPolicy UnresolvedSymbols;
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Target2Policy Target2;
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ARMVFPArgKind ARMVFPArgs = ARMVFPArgKind::Default;
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BuildIdKind BuildId = BuildIdKind::None;
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ELFKind EKind = ELFNoneKind;
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uint16_t DefaultSymbolVersion = llvm::ELF::VER_NDX_GLOBAL;
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uint16_t EMachine = llvm::ELF::EM_NONE;
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llvm::Optional<uint64_t> ImageBase;
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uint64_t CommonPageSize;
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uint64_t MaxPageSize;
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uint64_t MipsGotSize;
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uint64_t ZStackSize;
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unsigned LTOPartitions;
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unsigned LTOO;
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unsigned Optimize;
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unsigned ThinLTOJobs;
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int32_t SplitStackAdjustSize;
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// The following config options do not directly correspond to any
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// particualr command line options.
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// True if we need to pass through relocations in input files to the
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// output file. Usually false because we consume relocations.
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bool CopyRelocs;
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// True if the target is ELF64. False if ELF32.
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bool Is64;
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// True if the target is little-endian. False if big-endian.
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bool IsLE;
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// endianness::little if IsLE is true. endianness::big otherwise.
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llvm::support::endianness Endianness;
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// True if the target is the little-endian MIPS64.
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//
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// The reason why we have this variable only for the MIPS is because
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// we use this often. Some ELF headers for MIPS64EL are in a
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// mixed-endian (which is horrible and I'd say that's a serious spec
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// bug), and we need to know whether we are reading MIPS ELF files or
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// not in various places.
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//
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// (Note that MIPS64EL is not a typo for MIPS64LE. This is the official
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// name whatever that means. A fun hypothesis is that "EL" is short for
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// little-endian written in the little-endian order, but I don't know
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// if that's true.)
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bool IsMips64EL;
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// True if we need to set the DF_STATIC_TLS flag to an output file,
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// which works as a hint to the dynamic loader that the file contains
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// code compiled with the static TLS model. The thread-local variable
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// compiled with the static TLS model is faster but less flexible, and
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// it may not be loaded using dlopen().
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//
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// We set this flag to true when we see a relocation for the static TLS
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// model. Once this becomes true, it will never become false.
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//
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// Since the flag is updated by multi-threaded code, we use std::atomic.
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// (Writing to a variable is not considered thread-safe even if the
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// variable is boolean and we always set the same value from all threads.)
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std::atomic<bool> HasStaticTlsModel{false};
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// Holds set of ELF header flags for the target.
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uint32_t EFlags = 0;
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// The ELF spec defines two types of relocation table entries, RELA and
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// REL. RELA is a triplet of (offset, info, addend) while REL is a
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// tuple of (offset, info). Addends for REL are implicit and read from
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// the location where the relocations are applied. So, REL is more
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// compact than RELA but requires a bit of more work to process.
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//
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// (From the linker writer's view, this distinction is not necessary.
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// If the ELF had chosen whichever and sticked with it, it would have
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// been easier to write code to process relocations, but it's too late
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// to change the spec.)
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//
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// Each ABI defines its relocation type. IsRela is true if target
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// uses RELA. As far as we know, all 64-bit ABIs are using RELA. A
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// few 32-bit ABIs are using RELA too.
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bool IsRela;
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// True if we are creating position-independent code.
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bool Pic;
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// 4 for ELF32, 8 for ELF64.
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int Wordsize;
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};
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// The only instance of Configuration struct.
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extern Configuration *Config;
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static inline void errorOrWarn(const Twine &Msg) {
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if (!Config->NoinhibitExec)
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error(Msg);
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else
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warn(Msg);
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}
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} // namespace elf
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} // namespace lld
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#endif
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