Peter Smith found while trying to support thunk creation for ARM that
LLD sometimes creates broken thunks for MIPS. The cause of the bug is
that we assign file offsets to input sections too early. We need to
create all sections and then assign section offsets because appending
thunks changes file offsets for all following sections.

This patch separates the pass to assign file offsets from thunk
creation pass. This effectively reverts r265673.

Differential Revision: http://reviews.llvm.org/D21598

llvm-svn: 273532

llvm-svn: 273462

This fixes PR28218. Thanks to Rafael for spotting a failure in
the SHARED_LIBS build!

Differential Revision:  http://reviews.llvm.org/D21577

llvm-svn: 273451

llvm-svn: 273427

Since we do not have plans to support it in closest future,
it is better than common script parsing error.

llvm-svn: 273426

Patch implements hierarchies for version scripts. 
This allows to handle script files with dependencies, like next one has:

LIBSAMPLE_1.0{
  global:
  a;
};

LIBSAMPLE_2.0
{
  global:
  b;
}LIBSAMPLE_1.0;

Differential revision: http://reviews.llvm.org/D21556

llvm-svn: 273423

Found that during investigation of FreeBsd scripts.
Unclosed quote just crashed lld.

llvm-svn: 273398

For next version script:
VER1{
  global:
  a;
};

VER2{
  global:
  a;
};
gold would produce warning like:
"warning: using 'VER1' as version for 'a' which is also named in version 'VER2' in script."

Documentation also says we do not want this duplications (https://people.freebsd.org/~deischen/symver/library_versioning.txt):
"Note that you do not want to duplicate symbols in the map file. The .symver directives are all that is required to add compatibility
symbols into old versions."

This patch restricts such mixing and makes lld to produce error in this case.

Differential revision: http://reviews.llvm.org/D21555

llvm-svn: 273396

Previously, relocations for MIPS were scanned twice; once in regular
scanRelocs() and the other is in scanRelocsForThunks. In the former
function, we computed types of relocations and skipped R_THUNK relocations.
In the latter function, we computed the same value again and skipped
all but R_THUNK relocations. It was wasteful. This patch fixes that.
Now R_THUNK relocations are handled in the regular manner.

llvm-svn: 273346

Previously, `Buf + 4` was written twice.

llvm-svn: 273337

This reverts commit r273247.

lld should always use the new relocations.

llvm-svn: 273266

This is a follow-up patch to r273218. GNU ld accepts both "--" and "-"
for all multi-letter options except "-o". This patch makes lld compatible
with that behavior.

llvm-svn: 273256

It is an ABI requirement that the relocation must be used
in MOVQ or LEAQ instructions. Previously, we ignored invalid
relocations.

llvm-svn: 273248

`Inst` and `Op` variables are removed since they are not always
point to an instruction nor an operand. For 5-byte MOV instruction,
Op points to an instruction, which is confusing.

llvm-svn: 273246

llvm-svn: 273243

llvm-svn: 273242

This patch is to rewrite the function with a table-lookup-ish approach
so that it can read as a series of "convert this pattern to this" pattern.

llvm-svn: 273238

GNU ld's manual page says that all options whose names are
multiple letters, except those who start with "o", can start
either with one or two dashes.

llvm-svn: 273218

Reviewers: rafael, ruiu

Subscribers: kzhuravl, llvm-commits

Differential Revision: http://reviews.llvm.org/D21294

llvm-svn: 273192

Update an existing test to exercise the new functionality, while
I'm here.

llvm-svn: 273175

Thanks to Will Dietz for reporting the issue.

llvm-svn: 273157

llvm-svn: 273156

llvm-svn: 273155

llvm-svn: 273154

With fix:
-soname flag was not set in testcase. Hash calculated for base def was different on local
and bot machines because filename fos used for calculating.

Initial commit message:
Patch implements basic support of versioned symbols.
There is no wildcards patterns matching except local: *;
There is no support for hierarchies.
There is no support for symbols overrides (@ vs @@ not handled).

This patch allows programs that using simple scripts to link and run.

Differential revision: http://reviews.llvm.org/D21018

llvm-svn: 273152

Now it conforms requirement for std::stable_sort predicates. That
resolves build-bot failures on Windows hosts.

llvm-svn: 273151

It broke buildbot:
http://lab.llvm.org:8011/builders/llvm-clang-lld-x86_64-scei-ps4-ubuntu-fast

llvm-svn: 273146

Patch implements basic support of versioned symbols.
There is no wildcards patterns matching except local: *;
There is no support for hierarchies.
There is no support for symbols overrides (@ vs @@ not handled).

This patch allows programs that using simple scripts to link and run.

Differential revision: http://reviews.llvm.org/D21018

llvm-svn: 273143

llvm-svn: 273142

llvm-svn: 273140

There are two motivations for this patch. The first one is a preparation
for support MIPS TLS relocations. It might sound like a joke but for GOT
entries related to TLS relocations MIPS ABI uses almost regular approach
with creation of dynamic relocations for each GOT enty etc. But we need
to separate these 'regular' TLS related entries from MIPS specific local
and global parts of GOT. ABI declare simple solution - all TLS related
entries allocated at the end of GOT after local/global parts. The second
motivation it to support GOT relocations for non-preemptible symbols
with addends. If we have more than one GOT relocations against symbol S
with different addends we need to create GOT entries for each unique
Symbol/Addend pairs.

So we store all MIPS GOT entries in separate containers. For non-preemptible
symbols we have to maintain two data structures. The first one is MipsLocal
vector. Each entry corresponds to the GOT entry from the 'local' part
of the GOT contains the symbol's address plus addend. The second one
is MipsLocalMap. It is a map from Symbol/Addend pair to the GOT index.

Differential Revision: http://reviews.llvm.org/D21297

llvm-svn: 273127

llvm-svn: 273006

llvm-svn: 273004

Doing that in an anonymous version is a bit silly, but this opens the
way for supporting it in general.

Since we don't support actual versions, for now we just disable the
version script if we detect that it is missing a local.

llvm-svn: 273000

I think it is me who named these variables, but I always find that
they are slightly confusing because align is a verb.
Adding four letters is worth it.

llvm-svn: 272984

llvm-svn: 272976

llvm-svn: 272975

llvm-svn: 272974

llvm-svn: 272973

llvm-svn: 272972