Previously, undefined symbol errors are one line like this
and wasn't easy to read.

  /ssd/clang/bin/ld.lld: error: /ssd/llvm-project/lld/ELF/Writer.cpp:207: undefined symbol 'lld::elf::EhFrameSection<llvm::object::ELFType<(llvm::support::endianness)0, true> >::addSection(lld::elf::InputSectionBase*)'

This patch make it more structured like this.

  bin/ld.lld: error: undefined symbol: lld::elf::EhFrameSection<llvm::object::ELFType<(llvm::support::endianness)0, true>
  >>> Referenced by Writer.cpp:207 (/ssd/llvm-project/lld/ELF/Writer.cpp:207)
  >>>               Writer.cpp.o in archive lib/liblldELF.a

Discussion thread:
http://lists.llvm.org/pipermail/llvm-dev/2017-March/111459.html

Differential Revision: https://reviews.llvm.org/D31481

llvm-svn: 299097

This reverts commit because this really shouldn't happen unless
there's a bug in LLD.

llvm-svn: 299021

uint64_t is simpler and less error-prone than target or host-dependent types.

llvm-svn: 298969

If a function takes a size and an alignment, we usually pass them
in that order instead of the reverse order.

llvm-svn: 298968

This patch calls getAddend on a relocation only when the relocation is RELA.
That doesn't really improve runtime performance but should improve
readability as the code now matches the function description.

llvm-svn: 298828

llvm-svn: 298821

llvm-svn: 298818

Previously, computeAddend had many parameters but most of them were
used only for MIPS. The MIPS ABI is too odd that I don't want to mix
it into the regular code path. Splitting the function into non-MIPS
and MIPS parts makes the regular code path easy to follow.

llvm-svn: 298817

llvm-svn: 298815

llvm-svn: 298814

llvm-svn: 298796

llvm-svn: 298795

llvm-svn: 298794

llvm-svn: 298793

llvm-svn: 298792

llvm-svn: 298790

llvm-svn: 298789

llvm-svn: 298788

llvm-svn: 298787

C is short for Chunk, but we are no longer using that term.
RI is probably short for relocation iterator, but this is not an interator.

llvm-svn: 298786

Previously, relocation offsets are recalculated for .eh_frame sections
inside the main loop, and that messed up the main loop. This patch
separates that logic into a dedicated class.

llvm-svn: 298785

llvm-svn: 298748

llvm-svn: 298675

The original code is a big `if` and `else` which ends with `continue`
like this:

  if (cond) {
    ...
    // fall through
  } else {
    ...
    continue;
  }

This patch rewrites it with the following.

  if (!cond) {
    ...
    continue;
  }
  ...

llvm-svn: 298672

I honestly do not understand this part of code as it is too tangled.
What I'm trying now is to carefully disentangle it by transforming
code without changing meaining to see if I can improve overall
readability.

llvm-svn: 298576

llvm-svn: 298575

The patch introduces two new relocations expressions R_MIPS_GOT_GP and
R_MIPS_GOT_GP_PC. The first one represents a current value of `_gp`
pointer and used to calculate relocations against the `__gnu_local_gp`
symbol. The second one represents the offset between the beginning of
the function and the `_gp` pointer's value.

There are two motivations for introducing new expressions:
- It's better to keep all non-trivial relocation calculations in the
  single place - `getRelocTargetVA` function.
- Relocations against both `_gp_disp` and `__gnu_local_gp` symbols
  depend on the `_gp` value. It's a magical value points to the "middle"
  of GOT. Now all relocations use a common `_gp` value. But in fact,
  under some conditions each input file might require its own `_gp`
  value. I'm going to implement it in the future patches. So it's
  better to make `MipsGotSection` responsible for calculation of
  the `_gp` value.

llvm-svn: 298306

We had a few Config member functions that returns configuration values.
For example, we had is64() which returns true if the target is 64-bit.
The return values of these functions are constant and never change.

This patch is to compute them only once to make it clear that they'll
never change.

llvm-svn: 298168

recommend using llvm-ar when finding undefined references and empty archives

Summary:
When we perform LTO builds with a version of ar that does not
understand LLVM bitcode objects, we end up with undefined references,
because our archive files do not list the bitcode symbols in their
indices. The error messages do not make it clear what the real problem
is. This change adds a note that points out the likely problem and
solution. It is similar in spirit to r282633, but aims to avoid false
positives by only triggering when we see both undefined references and
archives without symbols in their indices.

Fixes PR32281.

Reviewers: davide, ruiu, tejohnson

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D31011

llvm-svn: 298124

llvm-svn: 298091

llvm-svn: 298072

Error was:
Relocations.cpp:792:38: error: expected primary-expression before ‘>’ token
         In<ELFT>::Iplt->addEntry<ELFT>(Body);

llvm-svn: 298070

Alternative approach can be remove templated method
either, like D31028 do.

llvm-svn: 298065

Was fixed, details on review page.

Original commit message:

That removes CopyRelSection class completely, making
Bss/BssRelRo to be just regular synthetics.

This is splitted from D30541 and polished.
Difference from D30541 that all logic of SharedSymbol
converting to DefinedRegular was removed for now and
probably will be posted as separate patch.

Differential revision: https://reviews.llvm.org/D30892

llvm-svn: 298062

That opens road to detemplate PltSection<ELFT>,
what allows then to detemplate all methods of SymbolBody.

llvm-svn: 297950

llvm-svn: 297942

llvm-svn: 297941

llvm-svn: 297939

llvm-svn: 297937

I suppose it is the reason of BB fail:
http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/921

https://bugs.llvm.org/show_bug.cgi?id=32167

llvm-svn: 297933