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Rafael Espindola 7efa5be205 Add support for merging strings with alignment larger than one char. 
This reduces the .rodata of scyladb from 4501932 to 4334639 bytes (1.038
times smaller).

I don't think it is critical to support tail merging, just exact
duplicates, but given the code organization it was actually a bit easier
to support both.

llvm-svn: 261327
 		2016-02-19 14:17:40 +00:00
..
CMakeLists.txt Set the folder for libraries to 'lld libraries'. NFC. 2016-01-07 00:14:04 +00:00
Config.h ELF: Create LinkerScript class to move code out of Writer. 2016-02-11 21:17:59 +00:00
Driver.cpp Add initial LTO support. 2016-02-12 20:54:57 +00:00
Driver.h ELF: Remove readLinkerScript and define LinkerScript::read instead. 2016-02-11 21:38:55 +00:00
DriverUtils.cpp Re-submit ELF: Report multiple errors from the driver. 2016-02-02 21:13:09 +00:00
Error.cpp ELF: Make link() to take an output stream to which error messages are written. 2016-02-02 22:49:32 +00:00
Error.h ELF: Make link() to take an output stream to which error messages are written. 2016-02-02 22:49:32 +00:00
InputFiles.cpp Add support for merging strings with alignment larger than one char. 2016-02-19 14:17:40 +00:00
InputFiles.h Add initial LTO support. 2016-02-12 20:54:57 +00:00
InputSection.cpp Fixed comments formatting. NFC. 2016-02-18 15:17:01 +00:00
InputSection.h Simplify MipsReginfoInputSection. 2016-01-06 22:42:43 +00:00
LinkerScript.cpp Attemp to heal windows buildbot 2016-02-19 11:56:49 +00:00
LinkerScript.h ELF: Add wildcard pattern matching to SECTIONS linker script command. 2016-02-12 21:47:28 +00:00
MarkLive.cpp Merge two consecutive if's. NFC. 2016-01-12 21:57:44 +00:00
Options.td [ELF] Implemented -Bsymbolic-functions command line option 2016-02-02 09:28:53 +00:00
OutputSections.cpp Add support for merging strings with alignment larger than one char. 2016-02-19 14:17:40 +00:00
OutputSections.h Add support for merging strings with alignment larger than one char. 2016-02-19 14:17:40 +00:00
README.md ELF: Write about the current policy to README. 2016-02-02 23:45:54 +00:00
SymbolTable.cpp Add initial LTO support. 2016-02-12 20:54:57 +00:00
SymbolTable.h Add initial LTO support. 2016-02-12 20:54:57 +00:00
Symbols.cpp Add initial LTO support. 2016-02-12 20:54:57 +00:00
Symbols.h Add initial LTO support. 2016-02-12 20:54:57 +00:00
Target.cpp make needsPlt a pure predicate. 2016-02-12 15:47:37 +00:00
Target.h make needsPlt a pure predicate. 2016-02-12 15:47:37 +00:00
Writer.cpp Add support for merging strings with alignment larger than one char. 2016-02-19 14:17:40 +00:00
Writer.h ELF2: Implement --gc-sections. 2015-10-22 18:49:53 +00:00

README.md

The New ELF Linker

This directory contains a port of the new PE/COFF linker for ELF.

Overall Design

See COFF/README.md for details on the design. Note that unlike COFF, we do not distinguish chunks from input sections; they are merged together.

Capabilities

This linker can link LLVM and Clang on Linux/x86-64 or FreeBSD/x86-64 "Hello world" can be linked on Linux/PPC64 and on Linux/AArch64 or FreeBSD/AArch64.

Performance

Achieving good performance is one of our goals. It's too early to reach a conclusion, but we are optimistic about that as it currently seems to be faster than GNU gold. It will be interesting to compare when we are close to feature parity.

Library Use

You can embed LLD to your program by linking against it and calling the linker's entry point function lld::elf2::link.

The current policy is that it is your reponsibility to give trustworthy object files. The function is guaranteed to return as long as you do not pass corrupted or malicious object files. A corrupted file could cause a fatal error or SEGV. That being said, you don't need to worry too much about it if you create object files in a usual way and give them to the linker (it is naturally expected to work, or otherwise it's a linker's bug.)