2015-08-14 22:12:54 +08:00
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//===- Config.h -------------------------------------------------*- C++ -*-===//
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2015-07-25 05:03:07 +08:00
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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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#ifndef LLD_ELF_CONFIG_H
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#define LLD_ELF_CONFIG_H
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2015-11-12 17:52:08 +08:00
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#include "llvm/ADT/MapVector.h"
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2015-07-25 05:03:07 +08:00
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#include "llvm/ADT/StringRef.h"
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2015-10-07 17:13:03 +08:00
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#include "llvm/Support/ELF.h"
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2015-07-25 05:03:07 +08:00
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2015-09-28 21:11:36 +08:00
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#include <vector>
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2015-07-25 05:03:07 +08:00
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namespace lld {
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2016-02-28 08:25:54 +08:00
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namespace elf {
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2015-07-25 05:03:07 +08:00
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2015-10-12 09:55:32 +08:00
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class InputFile;
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2016-04-15 22:41:56 +08:00
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struct Symbol;
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2015-10-10 05:12:40 +08:00
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2015-10-07 17:13:03 +08:00
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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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2016-08-31 16:38:11 +08:00
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// For --build-id.
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2016-08-26 17:55:37 +08:00
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enum class BuildIdKind { None, Fnv1, Md5, Sha1, Hexstring, Uuid };
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2016-04-08 06:49:21 +08:00
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2016-08-31 16:46:30 +08:00
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// For --discard-{all,locals,none}.
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enum class DiscardPolicy { Default, All, Locals, None };
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2016-08-31 16:38:11 +08:00
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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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2016-06-29 20:35:04 +08:00
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enum class UnresolvedPolicy { NoUndef, Error, Warn, Ignore };
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2016-07-16 20:26:39 +08:00
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struct SymbolVersion {
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llvm::StringRef Name;
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bool IsExternCpp;
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};
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2016-06-20 19:55:12 +08:00
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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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2016-07-16 12:02:00 +08:00
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struct VersionDefinition {
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VersionDefinition(llvm::StringRef Name, size_t Id) : Name(Name), Id(Id) {}
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2016-06-20 19:55:12 +08:00
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llvm::StringRef Name;
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2016-07-12 15:44:40 +08:00
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size_t Id;
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2016-07-16 20:26:39 +08:00
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std::vector<SymbolVersion> Globals;
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2016-06-20 19:55:12 +08:00
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size_t NameOff; // Offset in string table.
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};
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2016-01-06 01:55:05 +08:00
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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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2015-07-25 05:03:07 +08:00
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struct Configuration {
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2016-04-15 22:41:56 +08:00
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Symbol *EntrySym = nullptr;
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2015-10-12 09:55:32 +08:00
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InputFile *FirstElf = nullptr;
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2015-09-12 02:49:42 +08:00
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llvm::StringRef DynamicLinker;
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2015-09-30 06:33:21 +08:00
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llvm::StringRef Entry;
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2015-10-11 11:36:49 +08:00
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llvm::StringRef Emulation;
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2015-10-08 03:34:51 +08:00
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llvm::StringRef Fini;
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llvm::StringRef Init;
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2016-06-03 06:58:11 +08:00
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llvm::StringRef LtoAAPipeline;
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2016-05-16 03:29:38 +08:00
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llvm::StringRef LtoNewPmPasses;
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2015-10-07 08:25:09 +08:00
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llvm::StringRef OutputFile;
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2015-10-02 03:36:04 +08:00
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llvm::StringRef SoName;
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2015-09-30 06:33:21 +08:00
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llvm::StringRef Sysroot;
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2015-09-12 05:18:56 +08:00
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std::string RPath;
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2016-07-16 12:09:27 +08:00
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std::vector<VersionDefinition> VersionDefinitions;
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2016-09-02 17:13:05 +08:00
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std::vector<llvm::StringRef> AuxiliaryList;
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2016-04-14 02:51:11 +08:00
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std::vector<llvm::StringRef> DynamicList;
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2015-10-11 11:28:42 +08:00
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std::vector<llvm::StringRef> SearchPaths;
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2015-10-20 01:35:12 +08:00
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std::vector<llvm::StringRef> Undefined;
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2016-07-16 20:26:39 +08:00
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std::vector<SymbolVersion> VersionScriptGlobals;
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2016-05-14 05:55:56 +08:00
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std::vector<uint8_t> BuildIdVector;
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2015-10-01 01:26:13 +08:00
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bool AllowMultipleDefinition;
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2015-10-12 04:59:12 +08:00
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bool AsNeeded = false;
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2015-10-14 05:02:34 +08:00
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bool Bsymbolic;
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2016-02-02 17:28:53 +08:00
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bool BsymbolicFunctions;
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2016-01-14 02:55:39 +08:00
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bool Demangle = true;
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2016-04-03 11:39:09 +08:00
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bool DisableVerify;
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2016-01-15 21:34:52 +08:00
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bool EhFrameHdr;
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2015-10-07 04:02:15 +08:00
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bool EnableNewDtags;
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2015-10-01 01:26:13 +08:00
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bool ExportDynamic;
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2016-07-07 09:58:04 +08:00
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bool FatalWarnings;
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ELF2: Implement --gc-sections.
Section garbage collection is a feature to remove unused sections
from outputs. Unused sections are sections that cannot be reachable
from known GC-root symbols or sections. Naturally the feature is
implemented as a mark-sweep garbage collector.
In this patch, I added Live bit to InputSectionBase. If and only
if Live bit is on, the section will be written to the output.
Starting from GC-root symbols or sections, a new function, markLive(),
visits all reachable sections and sets their Live bits. Writer then
ignores sections whose Live bit is off, so that such sections are
excluded from the output.
This change has small negative impact on performance if you use
the feature because making sections means more work. The time to
link Clang changes from 0.356s to 0.386s, or +8%.
It reduces Clang size from 57,764,984 bytes to 55,296,600 bytes.
That is 4.3% reduction.
http://reviews.llvm.org/D13950
llvm-svn: 251043
2015-10-23 02:49:53 +08:00
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bool GcSections;
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2015-10-22 16:21:35 +08:00
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bool GnuHash = false;
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2016-02-26 02:43:51 +08:00
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bool ICF;
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2015-10-17 06:51:43 +08:00
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bool Mips64EL = false;
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2016-04-08 04:41:41 +08:00
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bool NoGnuUnique;
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2016-06-28 16:07:26 +08:00
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bool NoUndefinedVersion;
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2016-09-03 03:20:33 +08:00
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bool Nostdlib;
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2016-08-25 17:05:47 +08:00
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bool OFormatBinary;
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2016-03-17 13:57:33 +08:00
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bool Pic;
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bool Pie;
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2015-12-10 17:12:18 +08:00
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bool PrintGcSections;
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2016-03-14 04:10:20 +08:00
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bool Rela;
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2016-02-25 16:23:37 +08:00
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bool Relocatable;
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2016-03-10 04:01:08 +08:00
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bool SaveTemps;
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2015-10-01 01:26:13 +08:00
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bool Shared;
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2015-10-02 00:42:03 +08:00
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bool Static = false;
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2015-10-22 16:21:35 +08:00
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bool SysvHash = true;
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2016-08-02 03:28:13 +08:00
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bool Target1Rel;
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2016-03-11 12:23:12 +08:00
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bool Threads;
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2016-03-29 16:45:40 +08:00
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bool Trace;
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2015-10-11 10:03:03 +08:00
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bool Verbose;
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2016-03-14 17:19:30 +08:00
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bool WarnCommon;
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2016-05-10 23:47:57 +08:00
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bool ZCombreloc;
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2015-11-25 02:48:16 +08:00
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bool ZExecStack;
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2015-11-21 05:00:42 +08:00
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bool ZNodelete;
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bool ZNow;
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bool ZOrigin;
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2015-11-24 18:15:50 +08:00
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bool ZRelro;
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2016-08-31 16:46:30 +08:00
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DiscardPolicy Discard;
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2016-08-31 16:38:11 +08:00
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StripPolicy Strip = StripPolicy::None;
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2016-06-29 20:35:04 +08:00
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UnresolvedPolicy UnresolvedSymbols;
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2016-04-08 06:49:21 +08:00
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BuildIdKind BuildId = BuildIdKind::None;
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2015-10-14 00:20:50 +08:00
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ELFKind EKind = ELFNoneKind;
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2016-07-16 11:08:26 +08:00
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uint16_t DefaultSymbolVersion = llvm::ELF::VER_NDX_GLOBAL;
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2015-10-07 17:13:03 +08:00
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uint16_t EMachine = llvm::ELF::EM_NONE;
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2015-10-15 06:20:57 +08:00
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uint64_t EntryAddr = -1;
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2016-07-14 02:40:59 +08:00
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uint64_t ImageBase;
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2016-08-18 07:59:58 +08:00
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uint64_t ZStackSize = -1;
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2016-04-16 06:38:10 +08:00
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unsigned LtoJobs;
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2016-04-01 05:15:31 +08:00
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unsigned LtoO;
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unsigned Optimize;
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2015-07-25 05:03:07 +08:00
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};
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2016-01-06 01:55:05 +08:00
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// The only instance of Configuration struct.
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2015-07-25 05:03:07 +08:00
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extern Configuration *Config;
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2016-02-28 08:25:54 +08:00
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} // namespace elf
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2015-07-25 05:03:07 +08:00
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} // namespace lld
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#endif
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