Commit Graph

279 Commits

Author SHA1 Message Date
Fangrui Song ae0294375f [ELF] Default to --no-allow-shlib-undefined for executables
Summary:
This follows the ld.bfd/gold behavior.

The error check is useful as it captures a common type of ld.so undefined symbol errors as link-time errors:

    // a.cc => a.so (not linked with -z defs)
    void f(); // f is undefined
    void g() { f(); }

    // b.cc => executable with a DT_NEEDED entry on a.so
    void g();
    int main() { g(); }

    // ld.so errors when g() is executed (lazy binding) or when the program is started (-z now)
    // symbol lookup error: ... undefined symbol: f

Reviewers: ruiu, grimar, pcc, espindola

Reviewed By: ruiu

Subscribers: llvm-commits, emaste, arichardson

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D57569

llvm-svn: 352943
2019-02-02 00:34:28 +00:00
James Y Knight 94b9709d84 Fix some sphinx doc errors.
llvm-svn: 352887
2019-02-01 17:06:41 +00:00
James Y Knight 5d71fc5d7b Adjust documentation for git migration.
This fixes most references to the paths:
 llvm.org/svn/
 llvm.org/git/
 llvm.org/viewvc/
 github.com/llvm-mirror/
 github.com/llvm-project/
 reviews.llvm.org/diffusion/

to instead point to https://github.com/llvm/llvm-project.

This is *not* a trivial substitution, because additionally, all the
checkout instructions had to be migrated to instruct users on how to
use the monorepo layout, setting LLVM_ENABLE_PROJECTS instead of
checking out various projects into various subdirectories.

I've attempted to not change any scripts here, only documentation. The
scripts will have to be addressed separately.

Additionally, I've deleted one document which appeared to be outdated
and unneeded:
  lldb/docs/building-with-debug-llvm.txt

Differential Revision: https://reviews.llvm.org/D57330

llvm-svn: 352514
2019-01-29 16:37:27 +00:00
Chandler Carruth 2946cd7010 Update the file headers across all of the LLVM projects in the monorepo
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00
Peter Smith 13d134684f [ELF] Implement option to force PIC compatible Thunks
By default LLD will generate position independent Thunks when the --pie or
--shared option is used. Reference to absolute addresses is permitted in
other cases. For some embedded systems position independent thunks are
needed for code that executes before the MMU has been set up. The option
--pic-veneer is used by ld.bfd to force position independent thunks.
    
The patch adds --pic-veneer as the option is needed for the Linux kernel
on Arm.
    
fixes pr39886
    
Differential Revision: https://reviews.llvm.org/D55505

llvm-svn: 351326
2019-01-16 12:09:13 +00:00
Hans Wennborg 1fe469ae6c Bump the trunk version to 9.0.0svn
llvm-svn: 351320
2019-01-16 10:57:02 +00:00
Nico Weber 6a5d94cc08 lld/include/lld/Core/TODO.txt
- fix minor grammar stuff (I'm not a native speaker either, but it's hopefully a net improvement)
- mention that lld/coff is used in production
- update AArch64, ARM to production quality
- remove lld/include/lld/Core/TODO.txt which looks outdated

Differential Revision: https://reviews.llvm.org/D56600

llvm-svn: 351030
2019-01-14 00:45:27 +00:00
Rui Ueyama 4f194250ec Add a release note about MSP430 support.
llvm-svn: 350975
2019-01-11 22:31:35 +00:00
Martin Storsjo 17fb13bb40 [docs] Add a known limitation to the comment about lld supporting GCC/MinGW object files. NFC.
Differential Revision: https://reviews.llvm.org/D56335

llvm-svn: 350465
2019-01-05 10:44:03 +00:00
Fangrui Song f747971bf1 keymethod -> keyfunction
Pointed out by ruiu in rLLD349969

llvm-svn: 349974
2018-12-21 22:57:11 +00:00
Fangrui Song f874871c9e key method -> key function
The latter is what is actually called in the ABI http://itanium-cxx-abi.github.io/cxx-abi/abi.html#vague-vtable

Pointed out by rsmith

llvm-svn: 349969
2018-12-21 22:40:10 +00:00
Rui Ueyama afe9673df2 Add a doc for missing key function and an error message referencing the doc.
Summary:
This is a common error, and because many people don't know what the key
function is, it is sometimes very confusing.

The doc was originally written by Brooks Moses and slightly edited by me.

Reviewers: MaskRay, espindola

Subscribers: emaste, llvm-commits, arichardson

Differential Revision: https://reviews.llvm.org/D55968

llvm-svn: 349941
2018-12-21 19:28:49 +00:00
Sam Clegg db8dd23204 [WebAssembly] Update docs
This is an reland of rL343155 which got reverted because
of a sphinx failure on the buildbot.

Differential Revision: https://reviews.llvm.org/D54982

llvm-svn: 347830
2018-11-29 02:55:25 +00:00
George Rimar a1b3ddbfec [ELF] - Implement -z nodefaultlib
This is https://bugs.llvm.org//show_bug.cgi?id=38978

Spec says that:
"Objects may be built with the -z nodefaultlib option to
suppress any search of the default locations at runtime.
Use of this option implies that all the dependencies of an
object can be located using its runpaths.
Without this option, which is the most common case, no
matter how you augment the runtime linker's library
search path, its last element is always /usr/lib for 32-bit
objects and /usr/lib/64 for 64-bit objects."

The patch implements this option.

Differential revision: https://reviews.llvm.org/D54577

llvm-svn: 347647
2018-11-27 09:48:17 +00:00
George Rimar 5f8fc76b4e [LLD][ELF] - Fix mistype. NFC.
llvm-svn: 347485
2018-11-23 07:59:28 +00:00
Sam Clegg bfb75348e2 [WebAssembly] Initial support for shared objects (-shared)
Based on the initial spec proposal:
https://github.com/WebAssembly/tool-conventions/blob/master/DynamicLinking.md

The llvm/codegen side of this is still missing but I believe this change is
still worth landing as an incremental step

Differential Revision: https://reviews.llvm.org/D54249

llvm-svn: 346918
2018-11-15 00:37:21 +00:00
Rui Ueyama c2921f002e Add an entry to the release notes.
llvm-svn: 344062
2018-10-09 17:53:33 +00:00
Martin Storsjo db9148d21d [docs] Mention some notable feature in the release notes
Differential Revision: https://reviews.llvm.org/D52908

llvm-svn: 343878
2018-10-05 19:43:20 +00:00
Ed Maste bf378b808a ReleaseNotes: remove superfluous 's' in 'can promotes'
llvm-svn: 343820
2018-10-04 21:37:32 +00:00
Ali Tamur 63830b2794 Introduce a flag to warn when ifunc symbols are used with text relocations.
Summary:
This patch adds a new flag, --warn-ifunc-textrel, to work around a glibc bug. When a code with ifunc symbols is used to produce an object file with text relocations, lld always succeeds. However, if that object file is linked using an old version of glibc, the resultant binary just crashes with segmentation fault when it is run (The bug is going to be corrected as of glibc 2.19).

Since there is no way to tell beforehand what library the object file will be linked against in the future, there does not seem to be a fool-proof way for lld to give an error only in cases where the binary will crash. So, with this change (dated 2018-09-25), lld starts to give a warning, contingent on a new command line flag that does not have a gnu counter part. The default value for --warn-ifunc-textrel is false, so lld behaviour will not change unless the user explicitly asks lld to give a warning. Users that link with a glibc library with version 2.19 or newer, or does not use ifunc symbols, or does not generate object files with text relocations do not need to take any action. Other users may consider to start passing warn-ifunc-textrel to lld to get early warnings.

Reviewers: ruiu, espindola

Reviewed By: ruiu

Subscribers: grimar, MaskRay, markj, emaste, arichardson, llvm-commits

Differential Revision: https://reviews.llvm.org/D52430

llvm-svn: 343628
2018-10-02 20:30:22 +00:00
Rui Ueyama 1e591d807b Add an explanation about cross linking.
Differential Revision: https://reviews.llvm.org/D52567

llvm-svn: 343495
2018-10-01 16:41:58 +00:00
James Henderson 194a4eb8f7 Fix typo in LLD man page
llvm-svn: 343449
2018-10-01 09:57:20 +00:00
Sam Clegg bd37e09355 Revert "[WebAssembly] Update docs"
This change reverts rL343155.  It broke the builtbot, even though
it works for me locally:
http://lab.llvm.org:8011/builders/lld-sphinx-docs/builds/26336

Must be a sphinx version issue I guess.

llvm-svn: 343156
2018-09-27 00:42:49 +00:00
Sam Clegg 77ab7c1b30 [WebAssembly] Update docs
Differential Revision: https://reviews.llvm.org/D52048

llvm-svn: 343155
2018-09-27 00:22:24 +00:00
Rui Ueyama 378a028d91 Update a --help message and add -execute-only to the man page.
llvm-svn: 343032
2018-09-25 21:39:08 +00:00
George Rimar b5a6538b07 [ELF] - Add -z global option to manual.
This was requested during review of D49374,
but for some unknown reason was not in the final commit.

llvm-svn: 342954
2018-09-25 09:32:31 +00:00
Ed Maste c8ec7a9e1e Correct RISC-V link in release notes
llvm-svn: 342887
2018-09-24 14:47:56 +00:00
Rui Ueyama c41985a50e Update release notes.
llvm-svn: 342754
2018-09-21 17:48:45 +00:00
Rui Ueyama a3d0f40964 Update release notes.
llvm-svn: 342748
2018-09-21 17:13:55 +00:00
Ed Maste c0b474f67a lld: add -z interpose support
-z interpose sets the DF_1_INTERPOSE flag, marking the object as an
interposer.

Via FreeBSD PR 230604, linking Valgrind with lld failed.

Differential Revision:	https://reviews.llvm.org/D52094

llvm-svn: 342239
2018-09-14 14:25:37 +00:00
Hans Wennborg 8ec9b16f27 ReleaseNotes: update links to use https
llvm-svn: 341788
2018-09-10 08:52:31 +00:00
Fangrui Song 3a84a093f2 [docs] Add --print-icf-sections to ld.lld.1
llvm-svn: 340253
2018-08-21 07:35:23 +00:00
Hans Wennborg 5f3be212b1 Update docs version and clear release notes after 8.0.0 version bump
llvm-svn: 338558
2018-08-01 14:07:20 +00:00
Hans Wennborg 1cc3f51b04 windows_support.rst: Add links for downloading
llvm-svn: 338363
2018-07-31 12:02:03 +00:00
Hans Wennborg c7792a6cc7 index.rst: pe/coff does support pdbs now
llvm-svn: 338362
2018-07-31 12:00:26 +00:00
Fangrui Song f35ff042f4 [docs] Sort ld.lld.1 options
Reviewers: ruiu

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D50022

llvm-svn: 338326
2018-07-30 23:07:44 +00:00
Fangrui Song bac187bece [docs] Add missing options to ld.lld.1
Differential Revision: https://reviews.llvm.org/D49938

llvm-svn: 338320
2018-07-30 22:31:00 +00:00
Fangrui Song 05779bfcc8 [docs] Update ld.lld.1
llvm-svn: 338275
2018-07-30 17:36:38 +00:00
Peter Collingbourne a327a4c34e ELF: Implement --icf=safe using address-significance tables.
Differential Revision: https://reviews.llvm.org/D48146

llvm-svn: 337429
2018-07-18 22:49:31 +00:00
Rui Ueyama f75ea0b995 Implement --{push,pop}-state.
--push-state implemented in this patch saves the states of --as-needed,
--whole-archive and --static. It saves less number of flags than GNU linkers.
Since even GNU linkers save different flags, no one seems to care about the
details. In this patch, I tried to save the minimal number of flags to not
complicate the implementation and the siutation.

I'm not personally happy about adding the --{push,pop}-state flags though.
That options seem too hacky to me. However, gcc started using the options
since GCC 8 when GNU ld is available at the build time. Therefore, lld
is no longer a drop-in replacmenet for GNU linker for that machine
without supporting the flags.

Fixes https://bugs.llvm.org/show_bug.cgi?id=34567

Differential Revision: https://reviews.llvm.org/D47542

llvm-svn: 333646
2018-05-31 13:00:25 +00:00
Sam Clegg 262e09018b [WebAssembly] Remove final -wasm component of target triple. NFC.
This has been the default for a while now.

llvm-svn: 332009
2018-05-10 17:59:41 +00:00
Ed Maste 59c4962c1d Add -warn-backrefs (r329636) to lld's man page
llvm-svn: 331133
2018-04-29 02:18:48 +00:00
Ed Maste dfcd846b26 Update man page for long opts that accept = after r326506
Also remove the space between --lto-O and value, as the option with a
space is not accepted at present.

Leave --opt-remarks-filename as it does not currently accept the = form.

llvm.org/pr36563

llvm-svn: 326536
2018-03-02 02:57:12 +00:00
Ed Maste 9a289f7b72 Correct man page description for --section-start
The argument is section=address, not just address.

(For compatibility with GNU linkers we need to, but do not yet, accept
--section-start=section=address.)

llvm-svn: 326463
2018-03-01 19:02:41 +00:00
Ed Maste dde3a9170c Where possible use --long-opt=value in lld man page
We intend to maintain compatibility with GNU ld, and in the GNU world
long options are conventionally specified as --long-option=value. For
whatever reason GNU ld.bfd accepts both --long-option value and
--long-option=value, but documents the former. Follow suit.

Some lld long options do not accept the = form; this is probably a bug
to be fixed (along with a man page update).

Reported by Ingo Schwarze, for --entry.

llvm-svn: 326459
2018-03-01 18:40:11 +00:00
Ed Maste a83e226c2f Correct markup and nits in ld.lld man page
Patch by Ingo Schwarze

llvm-svn: 326446
2018-03-01 16:02:19 +00:00
Hans Wennborg ff52eb5927 ReleaseNotes: user lower-case for lld in the text
llvm-svn: 325869
2018-02-23 08:27:38 +00:00
Zachary Turner 401b2a463c Update lld documentation to mention PDB support.
Differential Revision: https://reviews.llvm.org/D43636

llvm-svn: 325821
2018-02-22 19:12:57 +00:00
Ed Maste 1136f3f0fd Add IMPLEMENTATION NOTES describing lld's .a handling in the man page
This content is based on the description in NewLLD.rst.

Differential Revision:	https://reviews.llvm.org/D43072

llvm-svn: 324739
2018-02-09 15:36:13 +00:00
Ed Maste 421fdaa121 Document --build-id=fast in ld.lld.1
Initial ld.lld.1 man page commit in r324512 crossed paths with r324502
which added --build-id=fast, allowing --build-id to be documented as a
synonym for --build-id=fast. Catch up with that change in the man page.

Differential Revision:	https://reviews.llvm.org/D43039

llvm-svn: 324528
2018-02-07 21:22:20 +00:00
Ed Maste 3a775a17ca Add ld.lld.1 man page, describing lld's ELF linker
One of the FreeBSD requirements for enabling lld as the system linker is
that it has a man page. Other FreeBSD developers and I created one using
lld's --help output as a starting point.  This is an expanded and
improved version of that.

This man page would benefit from additional content, but it provides
basic user-facing coverage of lld's options and serves as a good
starting point.

Differential Revision:	https://reviews.llvm.org/D42963

llvm-svn: 324512
2018-02-07 20:38:18 +00:00
Hans Wennborg b7f377a863 Docs, release notes: update version to 7.0.0
llvm-svn: 321729
2018-01-03 15:51:31 +00:00
Sam Clegg e8a4d5f808 [docs] Update doc building instructions
Differential Revision: https://reviews.llvm.org/D39984

llvm-svn: 319857
2017-12-05 23:31:26 +00:00
Sam Clegg c3e16d6002 [docs] Formatting-only change
Differential Revision: https://reviews.llvm.org/D40866

llvm-svn: 319856
2017-12-05 23:28:04 +00:00
Sam Clegg c94d393ad5 [WebAssembly] Initial wasm linker implementation
This linker backend is still a work in progress but is
enough to link simple programs including linking against
library archives.

Differential Revision: https://reviews.llvm.org/D34851

llvm-svn: 318539
2017-11-17 18:14:09 +00:00
Raphael Isemann c197fe1782 Fixed link to bugzilla in the sidebar
llvm-svn: 317675
2017-11-08 10:10:31 +00:00
Rui Ueyama f1f00841d9 Merge SymbolBody and Symbol into one class, SymbolBody.
SymbolBody and Symbol were separated classes due to a historical reason.
Symbol used to be a pointer to a SymbolBody, and the relationship
between Symbol and SymbolBody was n:1.

r2681780 changed that. Since that patch, SymbolBody and Symbol are
allocated next to each other to improve memory locality, and they have
1:1 relationship now. So, the separation of Symbol and SymbolBody no
longer makes sense.

This patch merges them into one class. In order to avoid updating too
many places, I chose SymbolBody as a unified name. I'll rename it Symbol
in a follow-up patch.

Differential Revision: https://reviews.llvm.org/D39406

llvm-svn: 317006
2017-10-31 16:07:41 +00:00
Rui Ueyama 3f851704c1 Move new lld's code to Common subdirectory.
New lld's files are spread under lib subdirectory, and it isn't easy
to find which files are actually maintained. This patch moves maintained
files to Common subdirectory.

Differential Revision: https://reviews.llvm.org/D37645

llvm-svn: 314719
2017-10-02 21:00:41 +00:00
Rui Ueyama 0b9fbf97f0 Fix .rst formatting error.
llvm-svn: 314618
2017-10-01 03:50:48 +00:00
Rui Ueyama 7430897a1d Update benchmark numbers.
llvm-svn: 314617
2017-10-01 03:47:02 +00:00
Rui Ueyama 432342b6a8 Update the monorepo URL in a lld's document.
llvm-svn: 313396
2017-09-15 21:04:43 +00:00
Nico Weber d7d98aa49f minor grammar fix
llvm-svn: 310111
2017-08-04 20:06:03 +00:00
Hans Wennborg 884e84533d Clear release notes for 6.0.0
llvm-svn: 308475
2017-07-19 14:09:52 +00:00
Hans Wennborg 7e9b4784a6 Bump docs version to 6.0
llvm-svn: 308463
2017-07-19 13:47:08 +00:00
Shoaib Meenai e7ecbbcd62 [lld] Update Windows support docs
The /appcontainer flag was added in r299728, and the lib.exe dependency
for creating import libraries was removed in r275242. Update the docs
accordingly.

The PDB support also needs updating, but I'll leave that for someone
who's more familiar with the current status (probably rnk).

llvm-svn: 307998
2017-07-14 04:05:39 +00:00
Eric Beckmann 9e19d790a6 Update documentation to reflection disuse of external cvtres.
Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D34316

llvm-svn: 305631
2017-06-17 02:26:27 +00:00
Rui Ueyama 0e2753897e Fix documentation.
We do not actually accept .rc files. We only accept .res files.

Pointed out by Eric Beckmann.

llvm-svn: 305406
2017-06-14 18:18:20 +00:00
Tom Stellard 9cd629a251 docs: Fix Sphinx detection with out-of-tree builds
Adapt to changes made in r302499.

llvm-svn: 302501
2017-05-09 01:43:22 +00:00
Rui Ueyama 42fca6e794 Recommend users use readelf instead of objdump to dump .comment contents.
readelf's output is much easier to read than objdump's as you can see below.

  $ readelf --string-dump .comment foo
  String dump of section '.comment':
    [     1]  GCC: (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4
    [    2c]  clang version 5.0.0
    [    41]  Linker: LLD 5.0.0

  $ objdump -j .comment -s foo
  Contents of section .comment:
   0000 00474343 3a202855 62756e74 7520342e  .GCC: (Ubuntu 4.
   0010 382e342d 32756275 6e747531 7e31342e  8.4-2ubuntu1~14.
   0020 30342e33 2920342e 382e3400 636c616e  04.3) 4.8.4.clan
   0030 67207665 7273696f 6e20352e 302e3020  g version 5.0.0
   0040 004c696e 6b65723a 204c4c44 20352e30  .Linker: LLD 5.0
   0050 2e3000                               .0.

llvm-svn: 301515
2017-04-27 04:50:08 +00:00
Sylvestre Ledru b307a0b949 Improve the documentation. Patch from genewitch. Found on https://github.com/llvm-mirror/lld/pull/5
llvm-svn: 296739
2017-03-02 10:40:24 +00:00
Rui Ueyama 9a651672d0 Clarify benchmark conditions.
llvm-svn: 296383
2017-02-27 21:07:50 +00:00
Rui Ueyama 33d9d5d5b4 Remove an obsolete/duplicate part of a document.
llvm-svn: 296304
2017-02-27 00:11:25 +00:00
Rui Ueyama 4d5f70ddea Fix rst markup.
llvm-svn: 296302
2017-02-26 22:17:46 +00:00
Rui Ueyama 81762abb6b Fix typo.
Pointed out by Piotr Padlewski.

llvm-svn: 296297
2017-02-26 18:32:31 +00:00
Rui Ueyama 19ce92e20c Add a section about how to use ld.lld.
llvm-svn: 296278
2017-02-26 00:20:42 +00:00
Rui Ueyama db895d839f Add how long it takes to link chromium using ld.bfd.
llvm-svn: 296236
2017-02-25 03:27:39 +00:00
Rui Ueyama 7c9f00e634 Fix rst document format error.
llvm-svn: 296235
2017-02-25 03:01:18 +00:00
Rui Ueyama bb361fcba1 Mention FreeBSD ports status and wordsmithing.
Differential Revision: https://reviews.llvm.org/D30321

llvm-svn: 296157
2017-02-24 18:54:47 +00:00
Rui Ueyama 0122142c57 Fix errors in the benchmark result.
I was mixing 1000 and 1024 when calculating file sizes in MiB or
in GiB.

llvm-svn: 296155
2017-02-24 18:50:58 +00:00
Rui Ueyama 28f46ba46f Add notes about the scope of the documents.
llvm-svn: 296088
2017-02-24 04:31:08 +00:00
Rui Ueyama 8b1c940c0b Re-add ReleaseNotes to the doc tree.
Looks like it is not allowed to have an .rst file in this directory
that does not belong to a document tree. I don't know why. This patch
adds a file back to fix a bot.

llvm-svn: 296087
2017-02-24 04:23:39 +00:00
Rui Ueyama 1582e76abd Reorganize the document structure a bit.
C++11.rst is removed because LLD now follows the usual coding style
of the LLVM project.

llvm-svn: 296086
2017-02-24 04:13:08 +00:00
Rui Ueyama 741cc4be7e Add documents to a doctree.
Looks like all documents must be in a doctree.

llvm-svn: 296075
2017-02-24 02:46:03 +00:00
Rui Ueyama fca2a110ed Attempt to fix lld-sphinx-docs bot.
llvm-svn: 296074
2017-02-24 02:07:54 +00:00
Rui Ueyama 2698ab4b62 Update the main document of LLD for those who are not familiar with the project.
llvm-svn: 296072
2017-02-24 01:55:50 +00:00
Hans Wennborg 36bcf8caf9 Don't try to link to the 4.0 release notes
llvm-svn: 294659
2017-02-09 23:27:17 +00:00
Sean Silva 69d65ac44b [docs] Fix typo in section heading.
llvm-svn: 292750
2017-01-22 03:28:56 +00:00
Hans Wennborg 1e307707b3 Clear the release notes for 5.0.0
llvm-svn: 291839
2017-01-12 22:00:54 +00:00
Hans Wennborg 0e978de2a9 Update docs/conf.py version
llvm-svn: 291833
2017-01-12 21:43:32 +00:00
Rui Ueyama 569851f1d6 Partially revert r287009: Remove trailing whitespace.
This reverts part of r287009 because I accidentally changed binary files.

llvm-svn: 287010
2016-11-15 19:09:13 +00:00
Rui Ueyama d7cfb1b6dd Remove trailing whitespace.
llvm-svn: 287009
2016-11-15 19:07:17 +00:00
Rui Ueyama 13146fce60 Update document.
llvm-svn: 284698
2016-10-20 05:35:25 +00:00
Rui Ueyama b66260ac17 Remove trailing whitespace.
llvm-svn: 283372
2016-10-05 20:09:50 +00:00
Etienne Bergeron 8430489847 fix warning when generating sphinx doc.
llvm-svn: 276227
2016-07-21 02:27:05 +00:00
Hans Wennborg 708cf064ca docs/conf.py: update version to 4.0
llvm-svn: 275847
2016-07-18 18:12:14 +00:00
Hans Wennborg 72acd60772 Trunk release notes are now for 4.0.0
The 3.9 release are on the 3.9 branch.

llvm-svn: 275845
2016-07-18 18:07:03 +00:00
Rui Ueyama 729822fe39 Update the readme text.
llvm-svn: 275305
2016-07-13 19:14:25 +00:00
Rui Ueyama 9337869393 Update numbers.
llvm-svn: 272596
2016-06-13 22:48:36 +00:00
Peter Collingbourne 4f9527065c ELF: New symbol table design.
This patch implements a new design for the symbol table that stores
SymbolBodies within a memory region of the Symbol object. Symbols are mutated
by constructing SymbolBodies in place over existing SymbolBodies, rather
than by mutating pointers. As mentioned in the initial proposal [1], this
memory layout helps reduce the cache miss rate by improving memory locality.

Performance numbers:

           old(s) new(s)
Without debug info:
chrome      7.178  6.432 (-11.5%)
LLVMgold.so 0.505  0.502 (-0.5%)
clang       0.954  0.827 (-15.4%)
llvm-as     0.052  0.045 (-15.5%)
With debug info:
scylla      5.695  5.613 (-1.5%)
clang      14.396 14.143 (-1.8%)

Performance counter results show that the fewer required indirections is
indeed the cause of the improved performance. For example, when linking
chrome, stalled cycles decreases from 14,556,444,002 to 12,959,238,310, and
instructions per cycle increases from 0.78 to 0.83. We are also executing
many fewer instructions (15,516,401,933 down to 15,002,434,310), probably
because we spend less time allocating SymbolBodies.

The new mechanism by which symbols are added to the symbol table is by calling
add* functions on the SymbolTable.

In this patch, I handle local symbols by storing them inside "unparented"
SymbolBodies. This is suboptimal, but if we do want to try to avoid allocating
these SymbolBodies, we can probably do that separately.

I also removed a few members from the SymbolBody class that were only being
used to pass information from the input file to the symbol table.

This patch implements the new design for the ELF linker only. I intend to
prepare a similar patch for the COFF linker.

[1] http://lists.llvm.org/pipermail/llvm-dev/2016-April/098832.html

Differential Revision: http://reviews.llvm.org/D19752

llvm-svn: 268178
2016-05-01 04:55:03 +00:00
Simon Atanasyan b5c0025d1d Remove links to deleted TODOs.
llvm-svn: 266528
2016-04-16 11:11:56 +00:00
Paul Robinson a8305830db Docs: keep copyright years up-to-date.
llvm-svn: 264942
2016-03-30 22:25:04 +00:00
Rui Ueyama 7a32d9a653 We do not use libLTO, so fix the error.
llvm-svn: 264093
2016-03-22 20:58:15 +00:00
Rui Ueyama 27a3f01deb ELF: Update the document.
llvm-svn: 263473
2016-03-14 19:53:52 +00:00
Rui Ueyama 88daab9174 ELF: Add a few numbers to the document.
llvm-svn: 263466
2016-03-14 18:43:01 +00:00
Rui Ueyama 02aa766897 Update the documents of the new LLD.
This patch merges the documents for ELF and COFF into one
and puts it into docs directory.

llvm-svn: 263336
2016-03-12 06:06:40 +00:00
Rafael Espindola fd14979812 Delete more ELF bits from the old linker.
llvm-svn: 262181
2016-02-28 16:03:37 +00:00
Rafael Espindola 79944f20ea Start adding release notes for lld.
llvm-svn: 260960
2016-02-16 13:12:55 +00:00
Hans Wennborg c89f805ca6 getting_started.rst: fix 'unknown target name' error
llvm-svn: 258953
2016-01-27 17:54:35 +00:00
Rui Ueyama df06d203e5 Update documents.
llvm-svn: 253728
2015-11-20 22:47:42 +00:00
Rui Ueyama 905c41b00d Update "Getting Started" document.
llvm-svn: 253522
2015-11-18 23:53:19 +00:00
Rui Ueyama 406c7d9540 COFF: Update windows_support.html.
llvm-svn: 246786
2015-09-03 17:01:18 +00:00
Rui Ueyama 08d9520f89 Fix docs-lld-html build.
llvm-svn: 234644
2015-04-10 21:37:42 +00:00
Rui Ueyama aa7b304ea7 Remove the Native file format.
The Native file format was designed to be the fastest on-memory or
on-disk file format for object files. The problem is that no one
is working on that. No LLVM tools can produce object files in
the Native, thus the feature of supporting the format is useless
in the linker.

This patch removes the Native file support. We can add it back
if we really want it in future.

llvm-svn: 234641
2015-04-10 21:23:51 +00:00
Rui Ueyama adafac6549 Update design.rst to remove a mention about round-trip tests.
llvm-svn: 234534
2015-04-09 20:43:38 +00:00
Rui Ueyama 24f2d2a9d5 Remove Makefiles.
Most developers prefer to not have them, and we agreed to
remove them from LLD.
http://lists.cs.uiuc.edu/pipermail/llvmdev/2015-March/083368.html

llvm-svn: 233313
2015-03-26 20:09:47 +00:00
Greg Fitzgerald 4b6a7e355b Fix five of the shared library build targets
Before this patch there was a cyclic dependency between lldCore and
lldReaderWriter.  Only lldConfig could be built as a shared library.

* Moved Reader and Writer base classes into lldCore.
* The following shared libraries can now be built:
     lldCore
     lldYAML
     lldNative
     lldPasses
     lldReaderWriter

Differential Revision: http://reviews.llvm.org/D7105

From: Greg Fitzgerald <garious@gmail.com>
llvm-svn: 226732
2015-01-21 22:54:56 +00:00
Greg Fitzgerald 8a1887f1f1 [ELF] Minimal implementation for ARM static linking
The code is able to statically link the simplest case of:

  int main() { return 0; }

* Only works with ARM code - no Thumb code, no interwork (-marm -mno-thumb-interwork)
* musl libc built with no interwork and no Thumb code

Differential Revision: http://reviews.llvm.org/D6716

From: Denis Protivensky <dprotivensky@accesssoftek.com>
llvm-svn: 226643
2015-01-21 07:35:48 +00:00
Rui Ueyama df230b21e3 Re-commit r225674: Convert other drivers to use WrapperNode.
The original commit had an issue with Mac OS dylib files. It didn't
handle fat binary dylib files correctly. This patch includes a fix.
A test for that case has already been committed in r225764.

llvm-svn: 226123
2015-01-15 04:34:31 +00:00
Rui Ueyama cfb2534ef8 Revert "Convert other drivers to use WrapperNode" and subsequent commits.
r225764 broke a basic functionality on Mac OS. This change reverts
r225764, r225766, r225767, r225769, r225814, r225816, r225829, and r225832.

llvm-svn: 225859
2015-01-14 00:21:34 +00:00
Rui Ueyama e8ecb2b144 Convert other drivers to use WrapperNode.
llvm-svn: 225764
2015-01-13 04:33:07 +00:00
Nico Weber 9b839f8ced Tweak lld's checkout instructions.
llvm-svn: 224778
2014-12-23 18:52:41 +00:00
Ed Maste aaa317a1eb lld self-hosts on FreeBSD too
llvm-svn: 224448
2014-12-17 19:14:57 +00:00
Simon Atanasyan e747a44fe8 Update current LLD status for MIPS target.
llvm-svn: 217372
2014-09-08 14:56:20 +00:00
Chad Rosier 69e2881070 [AArch64] Initial ELF/AArch64 Support
This patch adds the initial ELF/AArch64 support to lld. Only a basic "Hello
World" app has been successfully tested for both dynamic and static compiling.

Differential Revision: http://reviews.llvm.org/D4778
Patch by Daniel Stewart <stewartd@codeaurora.org>!

llvm-svn: 215544
2014-08-13 13:16:38 +00:00
Dan Liew 7f1a97bda0 Fix missing favicon.ico warning (Sphinx 1.2.2). The comments next to
``html_favicon`` seem to conflict with [what it in the sphinx
docs](http://sphinx-doc.org/config.html#confval-html_favicon).

So I've copied the comments from there to conf.py and changed its
value appropriately to remove the missing favicon.ico warning.

llvm-svn: 214971
2014-08-06 14:37:00 +00:00
Dan Liew ce5377afa0 Fix sphinx warning.
llvm-svn: 214968
2014-08-06 14:11:47 +00:00
Rui Ueyama 9aee050a0c Remove group-parent references.
Previously section groups are doubly linked to their children.
That is, an atom representing a group has group-child references
to its group contents, and content atoms also have group-parent
references to the group atom. That relationship was invariant;
if X has a group-child edge to Y, Y must have a group-parent
edge to X.

However we were not using group-parent references at all. The
resolver only needs group-child edges.

This patch simplifies the section group by removing the unused
reverse edge. No functionality change intended.

Differential Revision: http://reviews.llvm.org/D3945

llvm-svn: 210066
2014-06-03 03:07:49 +00:00
Reid Kleckner f00daf15f0 Add support for building Sphinx documentation when being built inside LLVM source tree and using CMake.
Patch by Dan Liew <daniel.liew@imperial.ac.uk>!

llvm-svn: 206662
2014-04-18 21:59:05 +00:00
Shankar Easwaran 7ac2a3df64 [core] add SectionGroup support
Review : http://llvm-reviews.chandlerc.com/D3182

llvm-svn: 204830
2014-03-26 16:37:13 +00:00
Rui Ueyama 6ab29444b0 [docs][Windows] Document how to build using Ninja.
llvm-svn: 203756
2014-03-13 05:48:46 +00:00
Rui Ueyama 21f97ddb58 [docs] Document how to build LLD as a win64 app.
llvm-svn: 203736
2014-03-12 23:40:18 +00:00
Rui Ueyama dcd25e31a7 [docs] Add a note on how to build LLD on Windows.
llvm-svn: 203613
2014-03-11 22:40:43 +00:00
Michael J. Spencer e1de2a39df [docs] Add list of missing GNU ld command line options.
llvm-svn: 203491
2014-03-10 21:25:43 +00:00
Michael J. Spencer 95a90099fa [docs] Add missing features for the x86-64 ELF backend.
llvm-svn: 203313
2014-03-07 23:54:27 +00:00
Michael J. Spencer 1dd276672f [docs] Update current status.
llvm-svn: 203188
2014-03-07 01:42:19 +00:00
Rui Ueyama 3e37326166 Add a document about Windows support.
llvm-svn: 203017
2014-03-05 22:35:32 +00:00
Rui Ueyama b63570ecb6 Fix broken link.
llvm-svn: 203004
2014-03-05 20:39:57 +00:00
Rui Ueyama 746c915c9d Visual Studio 11 = VS2012
llvm-svn: 203003
2014-03-05 20:36:07 +00:00
Chandler Carruth d40922989a Fix a typo spotted by Anton.
llvm-svn: 202638
2014-03-02 13:00:23 +00:00
Chandler Carruth 03b4e3a8cb [C++11] Update LLD documentation to just refer to the LLVM documentation
for C++11 issues.

llvm-svn: 202623
2014-03-02 09:17:09 +00:00
Shankar Easwaran 3d8de47f76 Fix trailing whitespace.
llvm-svn: 200182
2014-01-27 03:09:26 +00:00
NAKAMURA Takumi d40d387fb1 Update the copyright credits -- Happy new year 2014!
FIXME: Dragonegg may be updated at non-trivial changes.
llvm-svn: 198274
2014-01-01 08:27:31 +00:00
Rui Ueyama e68abc630e Update supported compiler list. Patch by Mikael Lyngvig!
llvm-svn: 196055
2013-12-02 01:22:17 +00:00
Joerg Sonnenberger a82566b86e Update documentation.
llvm-svn: 190255
2013-09-07 18:01:39 +00:00
Rui Ueyama 352e7308c0 Rename ti -> ctx.
This should have been done in r187823 when I renamed LinkingContext
from TargetInfo. I missed a few files.

llvm-svn: 189298
2013-08-27 00:04:42 +00:00
Rui Ueyama 0ca149fce9 Rename TargetInfo -> LinkingContext.
Also change some local variable names: "ti" -> "context" and
"_targetInfo" -> "_context".

Differential Revision: http://llvm-reviews.chandlerc.com/D1301

llvm-svn: 187823
2013-08-06 22:31:59 +00:00
Rui Ueyama 0227be6b0e [lld] Fix typo in document.
llvm-svn: 181652
2013-05-11 00:26:26 +00:00
Rui Ueyama eaadec3a39 [lld] Document about how to enable debug output.
llvm-svn: 181640
2013-05-10 22:19:28 +00:00
Nick Kledzik c314b46e71 This is my Driver refactoring patch.
The major changes are:
1) LinkerOptions has been merged into TargetInfo
2) LinkerInvocation has been merged into Driver
3) Drivers no longer convert arguments into an intermediate (core) argument 
   list, but instead create a TargetInfo object and call setter methods on 
   it. This is only how in-process linking would work. That is, you can 
   programmatically set up a TargetInfo object which controls the linking.
4) Lots of tweaks to test suite to work with driver changes
5) Add the DarwinDriver
6) I heavily doxygen commented TargetInfo.h

Things to do after this patch is committed:
a) Consider renaming TargetInfo, given its new roll. 
b) Consider pulling the list of input files out of TargetInfo. This will 
   enable in-process clients to create one TargetInfo the re-use it with 
   different input file lists.
c) Work out a way for Drivers to format the warnings and error done in 
   core linking.

llvm-svn: 178776
2013-04-04 18:59:24 +00:00
Michael J. Spencer ac4f444e39 [docs] lld self hosts.
llvm-svn: 174592
2013-02-07 07:26:45 +00:00