Patch fixes PR32024.

Sections that were not marked as Live has null output section.
Previously we tried to access that field and segfaulted.

Differential revision: https://reviews.llvm.org/D30188

llvm-svn: 295727

r295240 tweaked LLD to generate a symbol table when passing in
--export-dynamic, even when creating static executables. Add a test to
make sure this never regresses.

Reviewed by:	ruiu, rafael
Differential Revision:	https://reviews.llvm.org/D30175

llvm-svn: 295725

llvm-svn: 295724

Previously we evaluated the values of LMA incorrectly for next cases:

.text : AT(ADDR(.text) - 0xffffffff80000000) { ... }
.data : AT(ADDR(.data) - 0xffffffff80000000) { ... }
.init.begin : AT(ADDR(.init.begin) - 0xffffffff80000000) { ... }

Reason was that we evaluated offset when VA was not assigned. For case above
we ended up with 3 loads that has similar LMA and it was incorrect.
That is critical for linux kernel.

Patch updates the offset after VA calculation. That fixes the issue.

Differential revision: https://reviews.llvm.org/D30163

llvm-svn: 295722

Previously LLD would error out just "ld.lld: error: unable to move location counter backward"
What does not really reveal the place of issue,
Patch adds location to the output.

Differential revision: https://reviews.llvm.org/D30187

llvm-svn: 295720

Previously ASSERT we implemented returned expression value.
Ex:
. = ASSERT(0x100);
would set Dot value to 0x100

Form of assert when it is assigned to Dot was implemented for 
compatibility with very old GNU ld which required it.
Some scripts in the wild, including linux kernel scripts 
use such ASSERTs at the end for doing different checks.

Currently we fail with "unable to move location counter backward"
for such scripts. Patch changes ASSERT to return location counter 
value to fix that.

Differential revision: https://reviews.llvm.org/D30171

llvm-svn: 295703

    
This change moves the SymbolBodies with isLocal() == true before the global
symbols then calculating NumLocals rather than assuming all locals are
added before globals and the first NumLocals have isLocal() == true. This
permits Thunks to be moved after the pass that adds global symbols from
synthetics to the symbol table.

Differential revision: https://reviews.llvm.org/D30085

llvm-svn: 295650

llvm-svn: 295633

llvm-svn: 295632

llvm-svn: 295622

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

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

Previously LLD crashed on on provided testcases because "/DISCARD/" was
not supported. Patch implements that.

After this I think there is no known issues with --emit-relocs implementation
required for linux kernel linking.

Differential revision: https://reviews.llvm.org/D29273

llvm-svn: 295488

Before it would never print anything.

Thanks to George Rimar for pointing it out.

llvm-svn: 295485

I splitted it from D29273.
Since we plan to make relocatable sections as dependent for target ones for
--emit-relocs implementation, this change is required to support .eh_frame case.

EhInputSection inherets from InputSectionBase and not from InputSection.
So for case when it has relocation section, it should be able to access DependentSections
vector.

This case is real for Linux kernel.

Differential revision: https://reviews.llvm.org/D30084

llvm-svn: 295483

This is a small difference I noticed to gold and bfd. When given
--print-gc-sections, we print sections a linkerscript marks
DISCARD. The other linkers don't.

llvm-svn: 295467

This case should be possible to handle, but it is hard:

* In order to create program headers correctly, we have to scan the
  sections in the order they are in the file.

* To find that order, we have to "execute" the linker script.

* The linker script can contain SIZEOF_HEADERS.

So to support this we have to start with a guess of how many headers
we need (3), run the linker script and try to create the program
headers. If it turns out we need more headers, we run the script again
with a larger SIZEOF_HEADERS.

Also, running the linker script depends on knowing the size of the
sections, so we have to finalize them. But creating the program
headers can change the value stored in some sections, so we have to
split size finalization and content finalization.

Looks like the last part is also needed for range extension thunks, so
we might support this at some point. For now just report an error
instead of producing broken files.

llvm-svn: 295458

We were only checking when the assignment was inside a section.

llvm-svn: 295454

llvm-svn: 295448

The previous name caused a little confusion because the function not
only returns aliases but a given symbol itself too.

llvm-svn: 295408

llvm-svn: 295388

Without this we would produce two relocation sections pointing to the
same section, which gnu tools reject.

This fixes pr31986.

The implementation of -r/--emit-reloc is getting fairly
complicated. But lets get the test passing before trying to refactor
it.

llvm-svn: 295385

Some PDBs or object files can contain references to other PDBs
where the real type information lives.  When this happens,
all type indices in the original PDB are meaningless because
their records are not there.

With this patch we add the ability to pull type info from those
secondary PDBs.

Differential Revision: https://reviews.llvm.org/D29973

llvm-svn: 295382

I cannot reproduce the issue locally, but for some reason some bots
want to instantiate this from the header.

llvm-svn: 295365

We can do this now that the linker script and the writer agree on
which sections should be combined.

llvm-svn: 295341

SHF_LINK_ORDER sections adds special ordering requirements.
Such sections references other sections. Previously we would crash
if section that other were referenced to was discarded by script.

Patch fixes that by discarding all dependent sections in that case.
It supports chained dependencies, testcase is provided.

Differential revision: https://reviews.llvm.org/D30033

llvm-svn: 295332

Unfortunately, the common way of writing linker scripts seems to be
to get the output of ld.bfd --verbose and edit it a bit.

Also unfortunately, the bfd default script contains things like

.rela.dyn : { *(... .rela.data ...) }

but bfd actually ignores that for -emit-relocs, so we have to do the
same.

llvm-svn: 295324

The code to handle the input SHT_REL/SHT_RELA sections was getting
confused with the linker generated relocation sections.

llvm-svn: 295322

That fixes a case when section has more than one metadata 
section. Previously GC would collect one of such sections 
because we had implementation that stored only last one as
dependent.

Differential revision: https://reviews.llvm.org/D29981

llvm-svn: 295298

llvm-svn: 295289

llvm-svn: 295288

This patch removes NeedsCopyOrPltAddr and instead add two variables,
NeedsCopy and NeedsPltAddr. This uses one more bit in Symbol class,
but the actual size doesn't increase because we had unused bits.
This should improve code readability.

llvm-svn: 295287

llvm-svn: 295283

This is slightly inefficient than the previous code, but that is really
negligible as this function is usually called at most only a few times.

llvm-svn: 295282

llvm-svn: 295280

Previously, space in a BSS section for copy relocations are reserved
in a special way. We directly manipulated size of the BSS section.
r294577 changed the way of doing it. Now, we create an instance of
CopyRelSection (which is a synthetic input section) for each copy
relocation.

This patch removes the remains of the old way and add CopyRelSections
to BSS sections using `addSections` function, which is the usual
way to add an input section to an output section.

llvm-svn: 295278

In the target dependent code we already always return a int64_t. In
the target independent code we carefully use uintX_t, which has the
same result given 2 complement rules.

This just simplifies the code to use int64_t everywhere.

llvm-svn: 295263

For CloudABI I'm only interested in generating non-PIC/PIE executables
on armv6 and i686, as PIE introduces larger overhead than on aarch64 and
x86_64. Still, I want to be able to instruct the linker to generate a
dynamic symbol table if requested. One example use for this is that
dynamic symbol tables can be used by programs to print nicely formatted
stacktraces, including symbol names.

Right now there seems to be some logic in LLD that it only wants to emit
dynamic symbol tables when either linking against libraries or when
building PIC. Let's extend this to also take --export-dynamic into
account.

Reviewed by:	ruiu
Differential Revision:	https://reviews.llvm.org/D29982

llvm-svn: 295240

The linker script lexer is context-sensitive. In the regular context,
arithmetic operator characters are regular characters, but in the
expression context, they are independent tokens. This afects how the
lexer tokenizes "3*4", for example. (This kind of expression is real;
the Linux kernel uses it.)

This patch defines function `maybeSplitExpr`. This function splits the
current token into multiple expression tokens if the lexer is in the
expression context.

Differential Revision: https://reviews.llvm.org/D29963

llvm-svn: 295225

llvm-svn: 295222