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Fangrui Song 6cdd68e386 [PPC64] Define getThunkSectionSpacing() based on the range of R_PPC64_REL24 
Suggested by Sean Fertile and Peter Smith.

Thunk section spacing decrease the total number of thunks. I measured a
decrease of 1% or less in some large programs, with no perceivable
slowdown in link time. Override getThunkSectionSpacing() to enable it.
0x2000000 is the farthest point R_PPC64_REL24 can reach. I tried several
numbers and found 0x2000000 works the best. Numbers near 0x2000000 work
as well but let's just use the simpler number.

As demonstrated by the updated tests, this essentially changes placement
of most thunks to the end of the output section. We leverage this
property to fix PR40740 reported by Alfredo Dal'Ava Júnior:

The output section .init consists of input sections from several object
files (crti.o crtbegin.o crtend.o crtn.o). Sections other than the last
one do not have a terminator. With this patch, we create the thunk after
the last .init input section and thus fix the issue. This is not
foolproof but works quite well for such sections (with no terminator) in
practice.

Reviewed By: ruiu, sfertile

Differential Revision: https://reviews.llvm.org/D61720

llvm-svn: 360405
 		2019-05-10 05:51:00 +00:00
..
Arch [PPC64] Define getThunkSectionSpacing() based on the range of R_PPC64_REL24 2019-05-10 05:51:00 +00:00
AArch64ErrataFix.cpp Use llvm::stable_sort 2019-04-23 02:42:06 +00:00
AArch64ErrataFix.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
CMakeLists.txt Fail early if an output file is not writable 2019-03-11 16:30:55 +00:00
CallGraphSort.cpp Use llvm::stable_sort 2019-04-23 02:42:06 +00:00
CallGraphSort.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
Config.h [ELF] Dump symbols ordered by profiled guided section layout to file. 2019-03-27 23:52:22 +00:00
DWARF.cpp [ELF] Use llvm::bsearch. NFC 2019-04-17 08:00:46 +00:00
DWARF.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
Driver.cpp [ELF] Initialize Target before it may be dereferenced by findAux when reporting "duplicate symbol" error 2019-05-09 01:45:53 +00:00
Driver.h [WebAssembly] Handle command line options consistently with the ELF backend. 2019-05-08 16:20:05 +00:00
DriverUtils.cpp Add typo correction for command-line flags to ELF and COFF lld drivers 2019-05-07 13:48:30 +00:00
EhFrame.cpp [ELF][MachO][wasm] Simplify range-style std::find{,_if} with STLExtras.h utilities. NFC 2019-03-29 16:21:16 +00:00
EhFrame.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
ICF.cpp Use llvm::stable_sort 2019-04-23 02:42:06 +00:00
ICF.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
InputFiles.cpp Rename a variable and add a comment. 2019-04-10 06:32:05 +00:00
InputFiles.h [ELF] Fix typo: .symtab_shndxr -> .symtab_shndx 2019-04-12 02:20:52 +00:00
InputSection.cpp [PPC64] toc-indirect to toc-relative relaxation 2019-05-07 04:26:05 +00:00
InputSection.h [ELF] Place SectionPiece::{Live,Hash} bit fields together 2019-04-18 07:46:09 +00:00
LTO.cpp [ELF] Reorder BitcodeFiles.empty() to call thinLTOCreateEmptyIndexFiles() in only one place 2019-05-07 10:40:26 +00:00
LTO.h [ELF] Reorder BitcodeFiles.empty() to call thinLTOCreateEmptyIndexFiles() in only one place 2019-05-07 10:40:26 +00:00
LinkerScript.cpp [LLD][ELF] /DISCARD/ output sections should not be orphans 2019-04-30 14:31:22 +00:00
LinkerScript.h Replace `typedef A B` with `using B = A`. NFC. 2019-04-01 00:11:24 +00:00
MapFile.cpp Use llvm::stable_sort 2019-04-23 02:42:06 +00:00
MapFile.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
MarkLive.cpp Discard debuginfo for object files empty after GC 2019-04-10 10:37:10 +00:00
MarkLive.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
Options.td [ELF] Dump symbols ordered by profiled guided section layout to file. 2019-03-27 23:52:22 +00:00
OutputSections.cpp Use llvm::stable_sort 2019-04-23 02:42:06 +00:00
OutputSections.h [LLD][ELF] - Do not remove empty sections referenced in LOADADDR/ADDR commands. 2019-04-26 06:59:30 +00:00
README.md Update the documents of the new LLD. 2016-03-12 06:06:40 +00:00
Relocations.cpp [PPC64] toc-indirect to toc-relative relaxation 2019-05-07 04:26:05 +00:00
Relocations.h [PPC64] toc-indirect to toc-relative relaxation 2019-05-07 04:26:05 +00:00
ScriptLexer.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
ScriptLexer.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
ScriptParser.cpp [LLD][ELF] - Do not remove empty sections referenced in LOADADDR/ADDR commands. 2019-04-26 06:59:30 +00:00
ScriptParser.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
SymbolTable.cpp [ELF] Reorder BitcodeFiles.empty() to call thinLTOCreateEmptyIndexFiles() in only one place 2019-05-07 10:40:26 +00:00
SymbolTable.h De-template SymbolTable::addShared. 2019-04-09 08:52:00 +00:00
Symbols.cpp [ELF] Emit weak-undef symbols in .dynsym of a PIE binary only if linked against shared libs. 2019-03-18 15:32:57 +00:00
Symbols.h ELF: De-template SharedFile. NFCI. 2019-04-08 17:35:55 +00:00
SyntheticSections.cpp Use llvm::stable_sort 2019-04-23 02:42:06 +00:00
SyntheticSections.h [LLD][NFC] Refactor: BuildID hash size now computed in one place. 2019-05-09 08:08:09 +00:00
Target.cpp [PPC64] toc-indirect to toc-relative relaxation 2019-05-07 04:26:05 +00:00
Target.h [PPC64] toc-indirect to toc-relative relaxation 2019-05-07 04:26:05 +00:00
Thunks.cpp [mips] Remove redundant setup of less-significant bit. NFC 2019-03-13 16:00:35 +00:00
Thunks.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
Writer.cpp [LLD][NFC] Refactor: BuildID hash size now computed in one place. 2019-05-09 08:08:09 +00:00
Writer.h [ELF] Delete unused forward declarations and unused DynamicReloc::getInputSec(). NFC 2019-03-15 07:16:39 +00:00

README.md

See docs/NewLLD.rst