llvm-svn: 274109

So that users are not forced to pass `-m` on the command line
when the inputs are all bitcode.

PR:   28268
Differential Revision:  http://reviews.llvm.org/D21779

llvm-svn: 274107

llvm-svn: 274103

We allowed the function to return a vector that contains nullptrs
which is weird. This change makes the function to return only
defined symbols.

Differential Revision: http://reviews.llvm.org/D21828

llvm-svn: 274099

Example:

VERSION_1.0 {
  global: foo*;
  local: *; }

now correctly matches all the symbols which name starts with
`foo`.

Differential Revision:  http://reviews.llvm.org/D21732

llvm-svn: 274091

Previously, we initialized Config->EKind and Config->EMachine when
we instantiate ELF objects. That was not an ideal location to do that
because the logic was buried too deep inside a concrete logic.

This patch moves the code to the driver so that the initialization
becomes explicit.

Differential Revision: http://reviews.llvm.org/D21784

llvm-svn: 274089

They are significant now that we support @ in symbol names.

llvm-svn: 274071

-z defs is the same as --no-undefined (http://linux.die.net/man/1/ld).
It looks to be a error to handle it separatelly.

Differential revision: http://reviews.llvm.org/D21788

llvm-svn: 274003

t is possible to create new version of symbol instead of depricated one
using combination of version script and asm commands. For example:

__asm__(".symver b_1,b@LIBSAMPLE_1.0");
int b_1() { return 10; }
__asm__(".symver b_2,b@@LIBSAMPLE_2.0");
int b_2() { return 20; }

This code makes b_2() to be default implementation for b().
b_1() is used for compatibility with binaries compiled against
library of older version LIBSAMPLE_1.0.

This patch implements support for above functionality in lld.

Differential revision: http://reviews.llvm.org/D21681

llvm-svn: 274002

Option checks for cases where a version script explicitly lists
a symbol, but the symbol is not defined and errors out such
cases if any.

Differential revision: http://reviews.llvm.org/D21745

llvm-svn: 273998

Emitting an error in this case breaks real-world application (e.g. libreoffice).
See http://reviews.llvm.org/D21555 for context.

Differential Revision:  http://reviews.llvm.org/D21781

llvm-svn: 273989

This is for GNU compatibility.

llvm-svn: 273847

Previously, we searched for a .so file from all library paths and
then searched for a .a file. That logic is wrong. What we need to
do is to look for a .so and a .a for each library path.

llvm-svn: 273846

Because we always sort common symbols, we can ignore the option.

llvm-svn: 273842

llvm-svn: 273817

llvm-svn: 273771

PR: 28257
Differential Revision:   http://reviews.llvm.org/D21628

llvm-svn: 273698

Previously the next sample script would generate 2 entries in 
Config->SymbolVersions with the same version name.

VERSION {
 global: c;
};
That happened because parseVersionSymbols() was called twice.
At first for "global:" and since there is no local tag, it was called again.
Patch fixes the issue, testcase was updated to demonstrate.

Differential revision: http://reviews.llvm.org/D21640

llvm-svn: 273663

Patch implements support of zlib style compressed sections.
SHF_COMPRESSED flag is used to recognize that decompression is required.
After that decompression is performed and flag is removed from output.

Differential revision: http://reviews.llvm.org/D20272

llvm-svn: 273661

The patch adds one more partition to the MIPS GOT. This time it is for
TLS related GOT entries. Such entries are located after 'local' and 'global'
ones. We cannot get a final offset for these entries at the time of
creation because we do not know size of 'local' and 'global' partitions.
So we have to adjust the offset later using `getMipsTlsOffset()` method.

All MIPS TLS relocations which need GOT entries operates MIPS style GOT
offset - 'offset from the GOT's beginning' - MipsGPOffset constant. That
is why I add new types of relocation expressions.

One more difference from othe ABIs is that the MIPS ABI does not support
any TLS relocation relaxations. I decided to make a separate function
`handleMipsTlsRelocation` and put MIPS TLS relocation handling code
there. It is similar to `handleTlsRelocation` routine and duplicates its
code. But it allows to make the code cleaner and prevent pollution of
the `handleTlsRelocation` by MIPS 'if' statements.

Differential Revision: http://reviews.llvm.org/D21606

llvm-svn: 273569

llvm-svn: 273539

llvm-svn: 273538

Patch by Shridhar Joshi.

This option provides names of all the link time modules which define and
reference symbols requested by user. This helps to speed up application
development by detecting references causing undefined symbols.
It also helps in detecting symbols being resolved to wrong (unintended)
definitions in case of applications containing multiple definitions for
same symbols with different types, bindings.

Implements PR28226.

llvm-svn: 273536

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