Commit Graph

114 Commits

Author SHA1 Message Date
Alexandre Ganea d307c4c47f [LLD][COFF] Add support for /FUNCTIONPADMIN command-line option
Initial patch by Stefan Reinalter.

Fixes PR36775

Differential Revision: https://reviews.llvm.org/D49366

llvm-svn: 354716
2019-02-23 01:46:18 +00:00
Martin Storsjo 272d8c18e0 [COFF] Add -exclude-all-symbols for MinGW
This is a private undocumented option, intended to be used by
the MinGW driver frontend.

Also restructure the condition to put if (Config->MinGW) first.
This changes the behaviour for the tautological combination of
-export-all-symbols without -lldmingw.

Differential Revision: https://reviews.llvm.org/D58380

llvm-svn: 354386
2019-02-19 21:57:44 +00:00
Nico Weber 64fb85c907 lld-link: Add help strings for /manifest, /nodefaultlib, /noentry; tweak manifest help strings
My main motivation is that I can never remember /nodefaultlib and
`lld-link /? | grep no` didn't display it due to it not having a help string.

Differential Revision: https://reviews.llvm.org/D56502

llvm-svn: 350750
2019-01-09 19:18:03 +00:00
Will Wilson 3cb18346d7 [lld-link] Generalize handling of /debug and /debug:{none,full,fastlink,ghash,symtab}
Implement final argument precedence if multiple /debug arguments are passed on the command-line to match expected link.exe behavior.
Support /debug:none and emit warning for /debug:fastlink with automatic fallback to /debug:full.
Emit error if last /debug:option is unknown.
Emit warning if last /debugtype:option is unknown.

https://reviews.llvm.org/D50404

llvm-svn: 342894
2018-09-24 15:28:03 +00:00
Rui Ueyama 11ca38f421 COFF: Add support for /force:multiple option
Patch by Thomas Roughton.

This patch adds support for linking with multiple definitions to LLD's
COFF driver, in line with link.exe's /force:multiple option.

Differential Revision: https://reviews.llvm.org/D50598

llvm-svn: 342191
2018-09-13 22:05:10 +00:00
Nico Weber 11f14904d3 lld-link: Remove /msvclto option
This was useful for LTO bringup in lld-link while lld couldn't write PDBs. Now
that it can, this should no longer be needed. Hopefully the flag is obscure
enough and recent enough, that nobody uses it – but if somebody should use it,
they should be able to just stop passing it and things should continue to work.

https://reviews.llvm.org/D50139

llvm-svn: 338615
2018-08-01 19:00:49 +00:00
Takuto Ikuta d855928ec3 [PDB] Add PDBSourcePath flag to support absolutize source file path
This patch changes relative path for source files in obj files to
absolute path in PDB when linking with added flag.

I will make obj file generated by clang-cl independent from build
directory for chromium build. But I don't want to confuse visual studio
debugger or require additional configuration. To attain this goal, I
added flag to convert relative source file path in obj to absolute path
when emitting PDB.

By removing absolute path from obj files, we can share build cache
between chromium developers even when they are doing debug build.
That will make build time faster.

More context:
https://bugs.chromium.org/p/chromium/issues/detail?id=712796
https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/5HXSVX-7fPc

llvm-svn: 337439
2018-07-19 04:56:22 +00:00
Nico Weber c421fe5ef4 lld-link: Add /lib to Options.td so that it appears in lld-link's help output.
https://reviews.llvm.org/D49319

llvm-svn: 337086
2018-07-14 04:07:51 +00:00
Martin Storsjo 3a7905b2aa [COFF] Add an LLD specific option -debug:symbtab
With this set, we retain the symbol table, but skip the actual debug
information.

This is meant to be used by the MinGW frontend.

Differential Revision: https://reviews.llvm.org/D48745

llvm-svn: 335946
2018-06-29 06:08:25 +00:00
Nico Weber d657c25649 lld-link: Implement /INTEGRITYCHECK flag
/INTEGRITYCHECK has the effect of setting
IMAGE_DLLCHARACTERISTICS_FORCE_INTEGRITY. Fixes PR31066.
https://reviews.llvm.org/D47472

llvm-svn: 333652
2018-05-31 13:43:02 +00:00
Zachary Turner c8dd6ccc8a [COFF] Add /Brepro and /TIMESTAMP options.
Previously we would always write a hash of the binary into the
PE file, for reproducible builds.  This breaks AppCompat, which
is a feature of Windows that relies on the timestamp in the PE
header being set to a real value (or at the very least, a value
that satisfies certain properties).

To address this, we put the old behavior of writing the hash
behind the /Brepro flag, which mimics MSVC linker behavior.  We
also match MSVC default behavior, which is to write an actual
timestamp to the PE header.  Finally, we add the /TIMESTAMP
option (an lld extension) so that the user can specify the exact
value to be used in case he/she manually constructs a value which
is both reproducible and satisfies AppCompat.

Differential Revision: https://reviews.llvm.org/D46966

llvm-svn: 332613
2018-05-17 15:11:01 +00:00
Nico Weber cac2b3349e lld-link: Add --color-diagnostics(={always,never,auto})?, --no-color-diagnostics flags.
This is most useful when using lld-link on a non-Win host (but it might become
useful on Windows too if lld also grows a fansi-escape-codes flag).

Also make the help for --color-diagnostic mention the valid values in ELF and
wasm, and print the flag name with two dashes in diags, since the one-dash form
is seen as a list of many one-letter flags in some contexts.

https://reviews.llvm.org/D46693

llvm-svn: 332012
2018-05-10 18:19:02 +00:00
Zachary Turner d6fce2e9db [COFF] Alias /DEBUG:FULL to /DEBUG
With MSVC linker, /DEBUG is an alias of /DEBUG:FASTLINK, and if
you don't want /DEBUG:FASTLINK you have to explicitly specify
/DEBUG:FULL.

LLD doesn't support /DEBUG:FASTLINK, and so our standard /DEBUG
option is what MSVC calls /DEBUG:FULL.  To provide command line
compatibility with MSVC, we should also support /DEBUG:FULL, and
since it's the same as what LLD already does for /DEBUG, just
alias it.

llvm-svn: 330647
2018-04-23 20:54:08 +00:00
Peter Collingbourne c8f5c05d41 COFF: Document /pdbaltpath.
llvm-svn: 330488
2018-04-20 22:11:28 +00:00
Zachary Turner f228276262 [PDB] Resubmit "Support embedding natvis files in PDBs."
This was reverted several times due to what ultimately turned out
to be incompatibilities in our serialized hash table format.

Several changes went in prior to this to fix those issues since
they were more fundamental and independent of supporting injected
sources, so now that those are fixed this change should hopefully
pass.

llvm-svn: 328363
2018-03-23 19:57:25 +00:00
Zachary Turner fced530650 Revert "Resubmit "Support embedding natvis files in PDBs.""
This is still failing on a different bot this time due to some
issue related to hashing absolute paths.  Reverting until I can
figure it out.

llvm-svn: 328014
2018-03-20 18:37:03 +00:00
Zachary Turner 132d7a134f Resubmit "Support embedding natvis files in PDBs."
The issue causing this to fail in certain configurations
should be fixed.

It was due to the fact that DIA apparently expects there to be
a null string at ID 1 in the string table.  I'm not sure why this
is important but it seems to make a difference, so set it.

llvm-svn: 328002
2018-03-20 17:06:39 +00:00
Zachary Turner a21558897b Revert "Support embedding natvis files in PDBs."
This is causing a test failure on a certain bot, so I'm removing
this temporarily until we can figure out the source of the error.

llvm-svn: 327903
2018-03-19 20:41:59 +00:00
Zachary Turner de53aaf132 Support embedding natvis files in PDBs.
Natvis is a debug language supported by Visual Studio for
specifying custom visualizers.  The /NATVIS option is an
undocumented link.exe flag which will take a .natvis file
and "inject" it into the PDB.  This way, you can ship the
debug visualizers for a program along with the PDB, which
is very useful for postmortem debugging.

This is implemented by adding a new "named stream" to the
PDB with a special name of /src/files/<natvis file name>
and simply copying the contents of the xml into this file.

Additionally, we need to emit a single stream named
/src/headerblock which contains a hash table of embedded
files to records describing them.

This patch adds this functionality, including the /NATVIS
option to lld-link.

Differential Revision: https://reviews.llvm.org/D44328

llvm-svn: 327895
2018-03-19 19:53:51 +00:00
Martin Storsjo 5351891b55 [COFF] Add support for the GNU ld flag --kill-at
GNU ld has got a number of different flags for adjusting how to
behave around stdcall functions. The --kill-at flag strips the
trailing sdcall suffix from exported functions (which otherwise
is included by default in MinGW setups).

This also strips it from the corresponding import library though.
That makes it hard to link to such an import library from code
that calls the functions - but this matches what GNU ld does with
this flag. Therefore, this flag is probably not sensibly used
together with import libraries, but probably mostly when creating
some sort of plugin, or if creating the import library separately
with dlltool.

Differential Revision: https://reviews.llvm.org/D44292

llvm-svn: 327561
2018-03-14 20:17:16 +00:00
Reid Kleckner af2f7da74c [COFF] Add minimal support for /guard:cf
Summary:
This patch adds some initial support for Windows control flow guard. At
the end of the day, the linker needs to synthesize a table of RVAs very
similar to the structured exception handler table (/safeseh).

Both /safeseh and /guard:cf take sections of symbol table indices
(.sxdata and .gfids$y) and turn them into RVA tables referenced by the
load config struct in the CRT through special symbols.

Reviewers: ruiu, amccarth

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D42592

llvm-svn: 324306
2018-02-06 01:58:26 +00:00
Bob Haarman 5ec448516d [COFF] make /incremental control overwriting unchanged import libraries
Summary:
r323164 made lld-link not overwrite import libraries when their
contents haven't changed. MSVC's link.exe does this only when
performing incremental linking. This change makes lld-link's import
library overwriting similarly dependent on whether or not incremental
linking is being performed. This is controlled by the /incremental or
/incremental:no options. In addition, /opt:icf, /opt:ref, and /order
turn off /incremental and issue a warning if /incremental was
specified on the command line.

Reviewers: rnk, ruiu, zturner

Reviewed By: ruiu

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D42716

llvm-svn: 323930
2018-01-31 23:44:00 +00:00
Rui Ueyama 57175aa1e9 Add the /order option.
With the /order option, you can give an order file. An order file
contains symbol names, one per line, and the linker places comdat
sections in that given order. The option is used often to optimize
an output binary for (in particular, startup) speed by improving
locality.

Differential Revision: https://reviews.llvm.org/D42598

llvm-svn: 323579
2018-01-27 00:34:46 +00:00
Zachary Turner 727f153b6f [coff] Print detailed timing information with /TIME.
The classes used to print and update time information are in
common, so other linkers could use this as well if desired.

Differential Revision: https://reviews.llvm.org/D41915

llvm-svn: 322736
2018-01-17 19:16:26 +00:00
Bob Haarman e90ac016e7 [COFF] support /ignore:4217
Summary:
lld-link accepts link.exe's /ignore option, but used to ignore
it. This can lead to semantic differences when warnings are treated as
fatal errors. One such case is when we resolve an __imp_ symbol to a
local definition. We emit a warning in that case, which /wx turns into
a fatal. This change makes lld-link accept /ignore:4217 to suppress
that warning, so that code that links with link.exe /wx /ignore:4217
links with lld-link, too.

Fixes PR35762.

Reviewers: rnk, ruiu

Reviewed By: ruiu

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D41606

llvm-svn: 321512
2017-12-28 07:02:13 +00:00
Shoaib Meenai a1f6fba4d1 [COFF] Clean up debug option handling
/debug and /debug:dwarf are orthogonal. An object file can contain both
CodeView and DWARF debug info, so the combination of /debug:dwarf and
/debug should generate both DWARF and a PDB, rather than /debug:dwarf
always suppressing PDB creation.

/nopdb is now redundant and can be removed. /debug /nopdb was previously
used to support DWARF, but specifying /debug:dwarf is entirely
equivalent to that combination now.

Differential Revision: https://reviews.llvm.org/D41310

llvm-svn: 320896
2017-12-16 00:23:24 +00:00
Zachary Turner 0d07a8e948 [COFF] Teach LLD to use the COFF .debug$H section.
This adds the /DEBUG:GHASH option to LLD which will look for
the existence of .debug$H sections in linker inputs and use them
to accelerate type merging.  The clang-cl side has already been
added, so this completes the work necessary to begin experimenting
with this feature.

Differential Revision: https://reviews.llvm.org/D40980

llvm-svn: 320719
2017-12-14 18:07:04 +00:00
Peter Collingbourne 5e80bdebd2 COFF: Stop emitting a non-standard COFF symbol table into PEs.
Now that our support for PDB emission is reasonably good, there is
no longer a need to emit a COFF symbol table.

Also fix a bug where we would fail to emit a string table for long
section names if /debug was not specified.

Differential Revision: https://reviews.llvm.org/D40189

llvm-svn: 318548
2017-11-17 19:51:20 +00:00
Martin Storsjo 068512dfb9 [MinGW] Output debug info by default, unless the -s parameter is passed
Differential Revision: https://reviews.llvm.org/D39541

llvm-svn: 317376
2017-11-03 22:10:37 +00:00
Shoaib Meenai b57e640f3a [COFF] Add support for /WX
link.exe supports this option to convert warnings into errors, and it's
useful to support in LLD as well.

Differential Revision: https://reviews.llvm.org/D39148

llvm-svn: 316502
2017-10-24 21:19:22 +00:00
Shoaib Meenai 59bf362974 [COFF] Clean up boolean flag handling
LLD's handling of boolean flags is suboptimal:
* All boolean flags have a corresponding `:no` flag to turn the flag
  off, and the linker should scan for both the non-suffixed and suffixed
  flags (and the last one should win), but right now it only scans for
  either the suffixed or non-suffixed flag (depending on the default
  flag value).
* The `B` multiclass only allows specifying help text for the suffixed
  (`:no`) flag, but for some flags (e.g. `/appcontainer`) the help text
  should be associated with the non-suffixed flag instead.

Extend the `B` multiclass to have help text for both non-suffixed and
suffixed flag variants, and alter the existing help text accordingly in
some cases. Scan for both the non-suffixed and suffixed variants in the
driver and set config values accordingly.

This should mostly have no behavior change, apart from the added help
text and the modified argument scanning. Some flags are handled slightly
differently now, however; for example, LLD would previously always treat
64-bit images as large address aware, whereas `/largeaddressaware:no` is
now respected for 64-bit images (which is also how link.exe behaves).

Differential Revision: https://reviews.llvm.org/D39216

llvm-svn: 316501
2017-10-24 21:17:16 +00:00
Rui Ueyama a4cf97bc9c Add the --version option.
Differential Revision: https://reviews.llvm.org/D38972

llvm-svn: 316329
2017-10-23 14:57:53 +00:00
Martin Storsjo 7f71acdcd7 [COFF] Add support for automatically exporting all symbols
GNU ld automatically exports all symbols if no symbols have
been chosen to export via either def files or dllexport attributes.
The same behaviour can also be enabled via the GNU ld option
--export-all-symbols, in case some symbols are marked for export
via a def file or dllexport attribute.

The list of excluded symbols is from GNU ld, minus the
cygwin specific symbols.

Also add support for outputting the actual list of exported
symbols in a def file, as in the GNU ld option --output-def.

These options in GNU ld are documented in
https://sourceware.org/binutils/docs/ld/WIN32.html.

This currently exports all symbols from object files pulled in
from libmingw32 and libmingwex and other static libraries
that are linked in.

Differential Revision: https://reviews.llvm.org/D38760

llvm-svn: 315562
2017-10-12 05:37:13 +00:00
Martin Storsjo 31fe4cd25d [MinGW] Support dllexport on i386
In MinGW configurations (GCC, or clang with a *-windows-gnu target),
the -export directives in the object file contains the undecorated
symbol name, while it is decorated in MSVC configurations. (On the
command line, link.exe takes an undecorated symbol name for the
-export argument though.)

Differential Revision: https://reviews.llvm.org/D37772

llvm-svn: 313174
2017-09-13 19:29:39 +00:00
Martin Storsjo 8278ba51d3 [COFF] Add support for the -wholearchive option
This fixes PR31824.

Differential Revision: https://reviews.llvm.org/D37709

llvm-svn: 313123
2017-09-13 07:28:03 +00:00
Rui Ueyama 9d9bdabee3 Ignore /natvis option for now.
/natvis is a new command line option introduced by MSVC 2017.
We eventually have to support it, but for now, let's ignore it so that
we can at least link stuff instead of printing out an error.

Patch by Michael Rickert.

llvm-svn: 312966
2017-09-11 22:24:13 +00:00
Peter Collingbourne 052e855e2b COFF: Implement ThinLTO cache and cache pruning support.
Differential Revision: https://reviews.llvm.org/D37607

llvm-svn: 312770
2017-09-08 00:50:50 +00:00
Nico Weber a05cbb8b95 lld-link: Add --rsp-quoting= flag.
This ports https://reviews.llvm.org/D19425 from clang /
https://reviews.llvm.org/D22015 from the ELF port to COFF lld. This can be
useful when linking COFF files on a posix host.

https://reviews.llvm.org/D37452

llvm-svn: 312594
2017-09-05 23:46:45 +00:00
Martin Storsjo d2752aa9ec [COFF] Add support for aligncomm directives
These are emitted for comm symbols in object files, when targeting
a GNU environment.

Alternatively, just ignore them since we already align CommonChunk
to the natural size of the content (up to 32 bytes). That would only
trade away the possibility to overalign small symbols, which doesn't
sound like something that might not need to be handled?

Differential Revision: https://reviews.llvm.org/D36304

llvm-svn: 310871
2017-08-14 19:07:27 +00:00
Zachary Turner 7ba50b7151 Remove /dumppdb option from LLD.
This option is no longer needed.

Differential Revision: https://reviews.llvm.org/D34302

llvm-svn: 305610
2017-06-16 23:41:44 +00:00
Zachary Turner 8a7508970a [COFF] Fix interaction between /DEBUG and /PDB
When /DEBUG is not specified, /PDB should be ignored.  When
/DEBUG is specified, a PDB should be output regardless of
whether or not /PDB is specified.  /PDB just overrides the
default name.

This patch implements this behavior, and adds some tests, while
also removing a dead option /DEBUGPDB which was unused in any
code.

Differential Revision: https://reviews.llvm.org/D33302

llvm-svn: 303352
2017-05-18 15:15:10 +00:00
Saleem Abdulrasool 671029daec COFF: support the /appcontainer flag
The /appcontainer flag indicates that the module may only be used inside
an application container (for isolation).  This has been supported by
link.exe since Windows 8.0.  It sets an additional bit in the PE DLL
Characteristics flag to indicate the behavioural change.

llvm-svn: 299728
2017-04-06 23:07:53 +00:00
Bob Haarman ac8f7fc07b [COFF] support /ERRORLIMIT option
Summary:
This adds support for reporting multiple errors in a single invocation of lld-link. The limit defaults to 20 and can be changed with the /ERRORLIMIT command line parameter, or set to unlimited by passing a value of 0.

This is a new attempt after r295507, which was reverted because opening files raced with exiting early, causing the test to be flaky. This version avoids the race by exiting before calling enqueuePath.

Reviewers: pcc, ruiu

Reviewed By: ruiu

Subscribers: llvm-commits, dblaikie

Differential Revision: https://reviews.llvm.org/D31688

llvm-svn: 299496
2017-04-05 00:43:54 +00:00
Reid Kleckner 77d3aa476e Add a /nopdb flag to disable PDB generation
This will be used in the sanitizer test suite, which wants to use DWARF
line tables.

At some point we should reconsider how LLD handles the long section
names required by DWARF debug sections.

llvm-svn: 298544
2017-03-22 19:49:12 +00:00
David Blaikie 4cdfe69982 Revert "[COFF] support /ERRORLIMIT option"
Behavior races on ErrorCount. If the enqueued paths are evaluated
eagerly (in enqueuePath) then the behavior is as the test expects. But
they may not be evaluated until the future is waited on, in run() -
which is after the early return/exit on ErrorCount. (this causes the
test to fail (because in the "/ERRORCOUNT:XYZ" test, no other errors
are printed), at least for me, on linux)

This reverts commit r295507.

llvm-svn: 295590
2017-02-19 02:25:47 +00:00
Bob Haarman b96b10102a [COFF] support /ERRORLIMIT option
Summary: This adds support for reporting multiple errors in a single invocation of lld-link. The limit defaults to 20 and can be changed with the /ERRORLIMIT command line parameter, or set to unlimited by passing a value of 0.

Reviewers: pcc, ruiu

Reviewed By: ruiu

Differential Revision: https://reviews.llvm.org/D29691

llvm-svn: 295507
2017-02-17 22:46:06 +00:00
Bob Haarman 69b196dd91 [COFF] added support for /lldsavetemps
Summary: This adds an option to save temporary files generated during link-time optimization. This can be useful for debugging.

Reviewers: ruiu, pcc

Reviewed By: ruiu, pcc

Subscribers: mehdi_amini

Differential Revision: https://reviews.llvm.org/D29518

llvm-svn: 294498
2017-02-08 18:36:41 +00:00
Rui Ueyama 1e0b158dbd Add an option to use the MSVC linker to link LTO-generated object files.
This patch defines a new command line option, /MSVCLTO, to LLD.
If that option is given, LLD invokes link.exe to link LTO-generated
object files. This is hacky but useful because link.exe can create
PDB files.

Differential Revision: https://reviews.llvm.org/D29526

llvm-svn: 294234
2017-02-06 20:47:55 +00:00
Rui Ueyama 327705d17d Create a TPI stream only when /debugpdb is given.
Adding type records to TPI stream is too time consuming.
It is reported that linking chrome_child.dll took 5 minutes.

llvm-svn: 289330
2016-12-10 17:23:23 +00:00
Hans Wennborg 1818e65aad COFF: Support both /lldmap and /lldmap:<file>
The former option bases the filename on the output name, e.g. if the
link output is a.exe, the map will be written to a.map. This matches the
behaviour of link.exe's /MAP option and is useful for creating a map
file of each executable when building a large project.

Differential Revision: https://reviews.llvm.org/D27595

llvm-svn: 289271
2016-12-09 20:54:44 +00:00
Rui Ueyama be939b3ff6 Do plumbing work for CodeView debug info.
Previously, we discarded .debug$ sections. This patch adds them to
files so that PDB.cpp can access them.

This patch also adds a debug option, /dumppdb, to dump debug info
fed to createPDB so that we can verify that valid data has been passed.

llvm-svn: 287555
2016-11-21 17:22:35 +00:00
Saleem Abdulrasool a2cca7e2b4 COFF: handle /debugtype option
Add the support infrastructure for the /debugtype option which takes a comma
delimited list of debug info to generate. The defaults are based on other
options potentially (/driver or /profile). This sets up the infrastructure to
allow us to emit RSDS records to get "build id" equivalents on COFF (similar to
binutils).

llvm-svn: 278056
2016-08-08 22:02:44 +00:00
Peter Collingbourne feee2103c6 COFF: Implement /linkrepro flag.
This flag is implemented similarly to --reproduce in the ELF linker.

This patch implements /linkrepro by moving the cpio writer and associated
utility functions to lldCore, and using that implementation in both linkers.

One COFF-specific detail is that we store the object file from which the
resource files were created in our reproducer, rather than the resource
files themselves. This allows the reproducer to be used on non-Windows
systems for example.

Differential Revision: https://reviews.llvm.org/D22418

llvm-svn: 276719
2016-07-26 02:00:42 +00:00
Rui Ueyama afb1901e42 COFF: Support /manifestinput command line option.
Manifest file is a separate or embedded XML file having metadata
of an executable. As it is XML, it can contain various types of
information. Probably the most popular one is to request escalated
priviledges.

Usually the linker creates an XML file and embed that file into
an executable. However, there's a way to supply an XML file from
command line. /manifestniput is it.

Apparently it is over-designed here, but if you supply two or more
manifest files, then the linker needs to merge the files into a
single XML file. A good news is that we don't need to do that ourselves.
MT.exe command can do that, so we call the command from the linker
in this patch.

llvm-svn: 266704
2016-04-19 01:21:58 +00:00
Reid Kleckner 9cd77ce169 [coff] Accept and ignore another link.exe flag for compatibility
This flag disables link.exe's crash handler so that normal windows error
reporting and crash dumping occurs. For now it is reasonable for LLD to
ignore the flag.

Chromium is currently using this flag to collect minidumps of link.exe
crashing, and it breaks the LLD build.

llvm-svn: 264439
2016-03-25 18:09:29 +00:00
Rui Ueyama 9640173e16 COFF: Add /nosymtab command line option.
This is an LLD extension to MSVC link.exe command line. MSVC linker
does not write symbol tables for executables. We do unless no /debug
option is given.

There's a situation that we want to enable debug info but don't want
to emit the symbol table. One example is when we are comparing output
file size. With this patch, you can tell the linker to not create
a symbol table by just specifying /nosymtab.

llvm-svn: 248225
2015-09-21 23:43:31 +00:00
Rui Ueyama 31e66e32b4 COFF: Ignore /GUARDSYM option.
The option is added in MSVC 2015, and there's no documentation about
what the option is. This patch is to ignore the option for now, so that
at least LLD is usable with MSVC 2015.

llvm-svn: 246780
2015-09-03 16:20:47 +00:00
Rui Ueyama 3c4737db54 COFF: Ignore /editandcontinue option.
llvm-svn: 244626
2015-08-11 16:46:08 +00:00
Reid Kleckner 981576daf7 Add some help strings for /dll and /debug so they show up in /?
llvm-svn: 243757
2015-07-31 16:40:38 +00:00
Rui Ueyama 4323831732 COFF: Fix command line option spelling.
llvm-svn: 243573
2015-07-29 21:01:15 +00:00
Rui Ueyama 46682630f4 COFF: Ignore /ThrowNew command line option.
This command line option is added since MSVC 2015. Our wild guess is
that the flag is for LTCG and we can safely ignore that.

llvm-svn: 243568
2015-07-29 20:29:15 +00:00
Rui Ueyama ca577fd536 COFF: Remove unused command line option.
llvm-svn: 243533
2015-07-29 16:30:34 +00:00
Peter Collingbourne be54955bba COFF: Implement /lldmap flag.
This flag can be used to produce a map file, which is essentially a list
of objects linked into the final output file together with the RVAs of
their symbols. Because our format differs from MSVC's we expose it as a
separate flag.

Differential Revision: http://reviews.llvm.org/D10773

llvm-svn: 240812
2015-06-26 18:58:24 +00:00
Rui Ueyama 411c636081 COFF: Add a new PE/COFF port.
This is an initial patch for a section-based COFF linker.

The patch has 2300 lines of code including comments and blank lines.
Before diving into details, you want to start from reading README
because it should give you an overview of the design.

All important things are written in the README file, so I write
summary here.

- The linker is already able to self-link on Windows.

- It's significantly faster than the existing implementation.
  The existing one takes 5 seconds to link LLD on my machine,
  while the new one only takes 1.2 seconds, even though the new
  one is not multi-threaded yet. (And a proof-of-concept multi-
  threaded version was able to link it in 0.5 seconds.)

- It uses much less memory (250MB vs. 2GB virtual memory space
  to self-host).

- IMHO the new code is much simpler and easier to read than
  the existing PE/COFF port.

http://reviews.llvm.org/D10036

llvm-svn: 238458
2015-05-28 19:09:30 +00:00