svn commit: r304767 - in vendor/lld/dist: ELF docs test/ELF

Wed Aug 24 17:38:41 UTC 2016

Author: dim
Date: Wed Aug 24 17:38:40 2016
New Revision: 304767
URL: https://svnweb.freebsd.org/changeset/base/304767

Log:
  Vendor import of lld release_39 branch r279477:
  https://llvm.org/svn/llvm-project/lld/branches/release_39@279477

Modified:
  vendor/lld/dist/ELF/Target.cpp
  vendor/lld/dist/docs/ReleaseNotes.rst
  vendor/lld/dist/test/ELF/tls-i686.s

Modified: vendor/lld/dist/ELF/Target.cpp
==============================================================================

--- vendor/lld/dist/ELF/Target.cpp	Wed Aug 24 17:38:24 2016	(r304766)
+++ vendor/lld/dist/ELF/Target.cpp	Wed Aug 24 17:38:40 2016	(r304767)
@@ -436,6 +436,7 @@ uint64_t X86TargetInfo::getImplicitAdden
   case R_386_GOTPC:
   case R_386_PC32:
   case R_386_PLT32:
+  case R_386_TLS_LE:
     return read32le(Buf);
   }
 }

Modified: vendor/lld/dist/docs/ReleaseNotes.rst
==============================================================================
--- vendor/lld/dist/docs/ReleaseNotes.rst	Wed Aug 24 17:38:24 2016	(r304766)
+++ vendor/lld/dist/docs/ReleaseNotes.rst	Wed Aug 24 17:38:40 2016	(r304767)
@@ -5,9 +5,6 @@ LLD 3.9 Release Notes
 .. contents::
     :local:
 
-.. warning::
-   These are in-progress notes for the upcoming LLVM 3.9 release.
-
 Introduction
 ============
 
@@ -16,26 +13,90 @@ Here we describe the status of LLD, incl
 from the previous release. All LLD releases may be downloaded
 from the `LLVM releases web site <http://llvm.org/releases/>`_.
 
-Non-comprehensive list of changes in this release
-=================================================
+What's new in ELF Support?
+==========================
+
+LLD 3.9 is a major milestone for us. It is the first release that can
+link real-world large userland programs, including LLVM/Clang/LLD
+themselves. In fact, for example, it can now be used to produce most
+userland programs distributed as part of FreeBSD.
+
+Many contributors have joined to the project to develop new features,
+port it to new architectures and fix issues since the last release.
+
+Link-Time Optimization
+----------------------
+
+Initial support for LTO has been added. It is compatible with
+`the LLVM gold plugin <http://llvm.org/docs/GoldPlugin.html>`_ in terms of
+command line flags and input file format so that LLD is usable as a
+drop-in replacement for GNU gold. LTO is implemented as a native
+feature unlike the GNU gold's plugin mechanism.
+
+Identical Code Folding
+----------------------
+
+LLD 3.9 can now merge identical code sections to produce smaller
+output files. It is expected to be used with ``-ffunction-sections``.
+
+Symbol Versioning
+-----------------
+
+LLD 3.9 is able to link against versioned symbols as well as produce
+versioned symbols. Both the original Sun's symbol versioning scheme
+and the GNU extension are supported.
+
+New Targets
+-----------
+
+LLD has expanded support for new targets, including ARM/Thumb, the x32
+ABI and MIPS N64 ABI, in addition to the existing support for x86,
+x86-64, MIPS, PowerPC and PPC64.
+
+TLS Relocation Optimizations
+----------------------------
+
+The ELF ABI specification of the thread-local variable define a few
+peephole optimizations linkers can do by rewriting instructions at the
+link-time to reduce run-time overhead to access TLS variables. That
+feature has been implemented.
 
-ELF Improvements
+New Linker Flags
 ----------------
 
-* Initial support for LTO.
+Many command line options have been added in this release, including:
+
+- Symbol resolution and output options: ``-Bsymbolic-functions``,
+  ``-export-dynamic-symbol``, ``-image-base``, ``-pie``, ``-end-lib``,
+  ``-start-lib``, ``-build-id={md5,sha1,none,0x<hexstring>}``.
+
+- Symbol versioning option: ``-dynamic-list``.
+
+- LTO options: ``-lto-O``, ``-lto-aa-pipeline``, ``-lto-jobs``,
+  ``-lto-newpm-passes``, ``-plugin``, ``-plugin-eq``, ``-plugin-opt``,
+  ``-plugin-opt-eq``, ``-disable-verify``, ``-mllvm``.
+
+- Driver optionss: ``-help``, ``-version``, ``-unresolved-symbols``.
+
+- Debug options: ``-demangle``, ``-reproduce``, ``-save-temps``,
+  ``-strip-debug``, ``-trace``, ``-trace-symbol``,
+  ``-warn-execstack``.
+
+- Exception handling option: ``-eh-frame-hdr``.
+
+- Identical Code Folding option: ``-icf``.
 
 Changes to the MIPS Target
-~~~~~~~~~~~~~~~~~~~~~~~~~~
+--------------------------
 
 * Added support for MIPS N64 ABI.
 * Added support for TLS relocations for both O32 and N64 MIPS ABIs.
 
-COFF Improvements
------------------
-
-* Item 1.
-
-MachO Improvements
-------------------
+Building LLVM Toolchain with LLD
+--------------------------------
 
-* Item 1.
+A new CMake variable, ``LLVM_ENABLE_LLD``, has been added to use LLD
+to build the LLVM toolchain. If the varaible is true, ``-fuse-ld=lld``
+option will be added to linker flags so that ``ld.lld`` is used
+instead of default ``ld``.  Because ``-fuse-ld=lld`` is a new compiler
+driver option, you need Clang 3.8 or newer to use the feature.

Modified: vendor/lld/dist/test/ELF/tls-i686.s
==============================================================================
--- vendor/lld/dist/test/ELF/tls-i686.s	Wed Aug 24 17:38:24 2016	(r304766)
+++ vendor/lld/dist/test/ELF/tls-i686.s	Wed Aug 24 17:38:40 2016	(r304767)
@@ -28,7 +28,7 @@ _start:
  movl %gs:0, %ecx
  leal var at ntpoff(%ecx), %eax
  movl %gs:0, %ecx
- leal var1 at ntpoff(%ecx), %eax
+ leal var1 at ntpoff+123(%ecx), %eax
 
 // DIS:      Disassembly of section test:
 // DIS-NEXT: _start:
@@ -41,7 +41,7 @@ _start:
 // DIS-NEXT: 1201c: 65 8b 0d 00 00 00 00 movl %gs:0, %ecx
 // DIS-NEXT: 12023: 8d 81 f8 ff ff ff    leal -8(%ecx), %eax
 // DIS-NEXT: 12029: 65 8b 0d 00 00 00 00 movl %gs:0, %ecx
-// DIS-NEXT: 12030: 8d 81 fc ff ff ff    leal -4(%ecx), %eax
+// DIS-NEXT: 12030: 8d 81 77 00 00 00    leal 119(%ecx), %eax
 
 // RELOC: Relocations [
 // RELOC-NEXT: ]
@@ -57,7 +57,7 @@ _start:
 // DISSHARED-NEXT: 201c: 65 8b 0d 00 00 00 00  movl %gs:0, %ecx
 // DISSHARED-NEXT: 2023: 8d 81 00 00 00 00     leal (%ecx), %eax
 // DISSHARED-NEXT: 2029: 65 8b 0d 00 00 00 00  movl %gs:0, %ecx
-// DISSHARED-NEXT: 2030: 8d 81 00 00 00 00     leal (%ecx), %eax
+// DISSHARED-NEXT: 2030: 8d 81 7b 00 00 00     leal 123(%ecx), %eax
 
 // RELOCSHARED:      Relocations [
 // RELOCSHARED-NEXT: Section (4) .rel.dyn {
