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4edb309c27
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Keno Fischer 4edb309c27 [RuntimeDyldELF] Improve GOT support 
Summary:
This is the first in a series of patches to eventually add support for TLS relocations to RuntimeDyld. This patch resolves an issue in the current GOT handling, where GOT entries would be reused between object files, which leads to the same situation that necessitates the GOT in the first place, i.e. that the 32-bit offset can not cover all of the address space. Thus this patch makes the GOT object-file-local.
Unfortunately, this still isn't quite enough, because the MemoryManager does not yet guarantee that sections are allocated sufficiently close to each other, even if they belong to the same object file. To address this concern, this patch also adds a small API abstraction on top of the GOT allocation mechanism that will allow (temporarily, until the MemoryManager is improved) using the stub mechanism instead of allocating a different section. The actual switch from separate section to stub mechanism will be part of a follow-on commit, so that it can be easily reverted independently at the appropriate time.

Test Plan: Includes a test case where the GOT of two object files is artificially forced to be apart by several GB.

Reviewers: lhames

Reviewed By: lhames

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8813

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234839 91177308-0d34-0410-b5e6-96231b3b80d8
2015-04-14 02:10:35 +00:00
autoconf Try to unbreak Clang build to export LLVM_ABI_BREAKING_CHECKS, fixup for r233310. 2015-04-01 11:46:15 +00:00
bindings Go bindings: make various DIBuilder arguments optional. 2015-04-08 20:18:57 +00:00
cmake [CMake] Uniquify LLVM_ABI_BREAKING_CHECKS. It reverts r233784, "[CMake] Cache in LLVMConfig.cmake." 2015-04-13 04:54:12 +00:00
docs [docs] Update outdated ExtendingLLVM.rst 2015-04-13 16:04:17 +00:00
examples Use 'override/final' instead of 'virtual' for overridden methods 2015-04-11 02:11:45 +00:00
include DebugInfo: Move DIVariable::printExtendedName() to its only caller 2015-04-14 02:09:32 +00:00
lib [RuntimeDyldELF] Improve GOT support 2015-04-14 02:10:35 +00:00
projects Reverse the order libc++ and libc++abi are added in CMake. 2015-03-04 01:16:43 +00:00
test [RuntimeDyldELF] Improve GOT support 2015-04-14 02:10:35 +00:00
tools [Orc] Disambiguate call to make_unique. This should fix the builders broken by 2015-04-13 22:33:05 +00:00
unittests Make getModRefInfo with a default location not crash. 2015-04-13 23:05:45 +00:00
utils Use 'override/final' instead of 'virtual' for overridden methods 2015-04-11 02:11:45 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy Enable display of compiler diagnostics in clang-tidy by default. 2014-10-29 17:29:38 +00:00
.gitignore Ignore compile_commands.json only at the root of the tree. 2015-03-26 18:55:42 +00:00
CMakeLists.txt [CMake] Updates to llvm-shlib to support overriding exports list and added an option to export all symbols. 2015-04-13 21:29:46 +00:00
CODE_OWNERS.TXT Tom is also responsible for the 3.6 branch. 2015-03-16 18:15:27 +00:00
configure Try to unbreak Clang build to export LLVM_ABI_BREAKING_CHECKS, fixup for r233310. 2015-04-01 11:46:15 +00:00
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT Update for a new year. 2015-03-12 01:25:29 +00:00
llvm.spec.in
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +00:00
Makefile.common
Makefile.config.in Try to unbreak Clang build to export LLVM_ABI_BREAKING_CHECKS, fixup for r233310. 2015-04-01 11:46:15 +00:00
Makefile.rules Add support for SunOS function/data sections and associated 2015-03-03 20:54:29 +00:00
README.txt Revert test commit at revision 233535. 2015-03-30 12:39:03 +00:00

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