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Dave Lee 37d08700eb Allow empty mappings for optional YAML input 
Summary:
This change fixes a bug where `obj2yaml` can in some cases produce YAML that
causes `yaml2obj` to error.

The ELF YAML document structure has a `Sections` mapping, which contains three
mappings, all of which are optional: `Local`, `Global`, and `Weak.` Any one of
these can be missing, but if all three are missing, then `yaml2obj` errors. This
change allows YAML input for cases like this one.

I have tested this with check-llvm and check-lld, and all tests passed.

This change is the result of test failures while working on D39582, which
introduces a `DynamicSymbols` mapping, which will be empty at times.

Reviewers: compnerd, jakehehrlich, silvas, kledzik, mehdi_amini, pcc

Reviewed By: compnerd

Subscribers: silvas, llvm-commits

Differential Revision: https://reviews.llvm.org/D39908

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@318428 91177308-0d34-0410-b5e6-96231b3b80d8
2017-11-16 17:46:11 +00:00
bindings Update go bindings to use new functions from rL317135. 2017-11-02 10:22:26 +00:00
cmake [globalisel][tablegen] Generate rule coverage and use it to identify untested rules 2017-11-16 00:46:35 +00:00
docs Let llvm.invariant.group.barrier accepts pointer to any address space 2017-11-16 16:32:16 +00:00
examples Fix broken links to the Itanium CXX ABI 2017-09-12 00:19:11 +00:00
include [DebugInfo/PDB] Exclude the PDB/DIA files added in my previous commit from modulemap 2017-11-16 17:24:49 +00:00
lib Allow empty mappings for optional YAML input 2017-11-16 17:46:11 +00:00
projects Revert "Update test_debuginfo.pl script to point to new tree location." 2017-11-13 23:33:29 +00:00
resources
runtimes [CMake][runtimes] Don't process common options in runtimes build 2017-11-14 23:56:05 +00:00
test Allow empty mappings for optional YAML input 2017-11-16 17:46:11 +00:00
tools Convert another use of createUniqueFile to TempFile::create. 2017-11-16 17:35:50 +00:00
unittests [DebugInfo/PDB] Adding getUndecoratedNameEx and IPDB interfaces for IDiaEnumTables and IDiaTable. 2017-11-16 14:33:09 +00:00
utils [globalisel][tablegen] Generate rule coverage and use it to identify untested rules 2017-11-16 00:46:35 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitignore
CMakeLists.txt [globalisel][tablegen] Generate rule coverage and use it to identify untested rules 2017-11-16 00:46:35 +00:00
CODE_OWNERS.TXT Update my email addresses, NFC. 2017-10-26 10:16:54 +00:00
configure
CREDITS.TXT Add myself to CREDITS.txt 2017-09-18 14:33:39 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
README.txt Test commit access 2017-08-18 02:39:28 +00:00
RELEASE_TESTERS.TXT Update my email addresses, NFC. 2017-10-26 10:16:54 +00:00

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