llvm-svn: 287738

We cannot have MipsRldMap class and In<ELFT>::MipsRldMap.
Renamed the class.

llvm-svn: 287683

Differential revision: https://reviews.llvm.org/D26958

llvm-svn: 287675

llvm-svn: 287617

llvm-svn: 287616

llvm-svn: 287615

llvm-svn: 287614

llvm-svn: 287613

Some synthetic sections are not derived calsses of SyntehticSection.
They are derived directly from InputSection. For consistencly, we should
use SyntheticSection.

llvm-svn: 287606

llvm-svn: 287605

We had five different BuildId subclasses for five different types
of build-ids. They can simply be merged to a single class.

llvm-svn: 287603

Differential revision: https://reviews.llvm.org/D26918

llvm-svn: 287554

Differential revision: https://reviews.llvm.org/D26906

llvm-svn: 287549

Differential revision: https://reviews.llvm.org/D26854

llvm-svn: 287526

Differential revision: https://reviews.llvm.org/D26842

llvm-svn: 287346

Differential revision: https://reviews.llvm.org/D26834

llvm-svn: 287326

Differential revision: https://reviews.llvm.org/D26792

llvm-svn: 287322

Also add new comments with MIPS GOT description.

llvm-svn: 287264

Differential revision: https://reviews.llvm.org/D26740

llvm-svn: 287216

llvm-svn: 287202

MIPS GOT handling is very different from other targets so it is better
to keep the code in the separatre section class MipsGotSection. This
patch introduces the new section and moves all MIPS specific code from
GotSection to the new class. I did not rename fields and methods in the
MipsGotSection class to reduce the diff and plan to do that by the
separate commit.

Differential revision: https://reviews.llvm.org/D26733

llvm-svn: 287150

Differential revision: https://reviews.llvm.org/D26669

llvm-svn: 287092

This patch introduces the following changes:
- DynamicSection now inherits InputSection<ELFT> and was moved
  to SyntheticSections.h/.cpp.
- Link and Entsize fields of DynamicSection are propagated to 
  its output section
- In<ELFT>::SyntheticSections was removed.
- Finalization of synthetic sections was removed from 
  OutputSection<ELFT>::finalize. Now finalizeSyntheticSections is
  used instead.

Differential revision: https://reviews.llvm.org/D26603

llvm-svn: 286950

Differential revision: https://reviews.llvm.org/D26549

llvm-svn: 286799

llvm-svn: 286588

Differential revision: https://reviews.llvm.org/D26498

llvm-svn: 286580

Summary:
This patch adds a ".comment" section to an output. The comment
section contains the linker's version string. You can now
find out whether a binary is created by LLD or not using objdump
command like this.

  $ objdump -s -j .comment foo

  foo:     file format elf64-x86-64

  Contents of section .comment:
   0000 00474343 3a202855 62756e74 7520342e  .GCC: (Ubuntu 4.
   0010 382e342d 32756275 6e747531 7e31342e  8.4-2ubuntu1~14.
   ...
   00c0 766d2f74 72756e6b 20323835 38343629  vm/trunk 285846)
   00d0 004c696e 6b65723a 204c4c44 20342e30  .Linker: LLD 4.0
   00e0 2e302028 7472756e 6b203238 36343036  .0 (trunk 286406
   00f0 2900                                 ).

Compilers emits .comment section as well, so the output contains
both compiler and linker information.

Alternative considered:

I first tried to add a SHT_NOTE section because GNU gold does that.
A NOTE section starts with a header which contains content type.
It turned out that ld.gold sets type NT_GNU_GOLD_VERSION to their
NOTE section. So the NOTE type is only for GNU gold (surprise!)

Next, I tried to create ".linker-version" section. However, it seems
that reusing the existing ".comment" section is better because 1)
other tools already know about .comment section and is able to strip
it and 2) the result contans not only linker info but also compiler
info.

Differential Revision: https://reviews.llvm.org/D26487

llvm-svn: 286496

Thanks to Michael Spencer for the suggestion.

llvm-svn: 286462

llvm-svn: 286445

Differential revision: https://reviews.llvm.org/D26349

llvm-svn: 286443

Previously, we have both input and output section for .MIPS.abiflags.
Now we have only one class for .MIPS.abiflags, which is MipsAbiFlagsSection.
This class is a synthetic input section.

.MIPS.abiflags sections are handled as regular sections until
the control reaches Writer. Writer then aggregates all sections
whose type is SHT_MIPS_ABIFLAGS to create a single synthesized
input section. The synthesized section is then processed normally
as if it came from an input file.

llvm-svn: 286398

Previously, we have both input and output sections for .reginfo and
.MIPS.options. Now for each such sections we have one synthetic input
sections: MipsReginfoSection and MipsOptionsSection respectively.

Both sections are handled as regular sections until the control reaches
Writer. Writer then aggregates all sections whose type is SHT_MIPS_REGINFO
or SHT_MIPS_OPTIONS to create a single synthesized input section. In that
moment Writer also save GP0 value to the MipsGp0 field of the corresponding
ObjectFile. This value required for R_MIPS_GPREL16 and R_MIPS_GPREL32
relocations calculation.

Differential revision: https://reviews.llvm.org/D26444

llvm-svn: 286397

We can just use a regular InputSection.

llvm-svn: 286237

This reverts commit r286100.

This saves 8 bytes of every InputSection.

llvm-svn: 286235

With the current infrastructure it can be just an ordinary
InputSection like the real .bss sections.

llvm-svn: 286234

Differential revision: https://reviews.llvm.org/D26281

llvm-svn: 286100

This fixes casting warning and removes the need of that cast at all.

llvm-svn: 286065

Patch switches computing of --build-id hash to tree.

This is the way when input data is splitted by chunks,
hash is computed for each one in threaded/non-threaded way.
At the end hash is conputed for result tree.

With or without -threads the result hash is the same.

Differential revision: https://reviews.llvm.org/D26199

llvm-svn: 286061

A CommonInputSection is a section containing all common symbols.
That was an input section but was abstracted in a different way
than the synthetic input sections because it was written before
the synthetic input section was invented.

This patch rewrites CommonInputSection as a synthetic input section
so that it behaves better with other sections.

llvm-svn: 286053

Differential Revision: https://reviews.llvm.org/D26225

llvm-svn: 285851