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Pavel Labath 8ac0bc9832 DWARFContext: Make loading of sections thread-safe 
Summary:
SymbolFileDWARF used to load debug sections in a thread-safe manner.
When we moved to DWARFContext, we dropped the thread-safe part, because
we thought it was not necessary.

It turns out this was only mostly correct.

The "mostly" part is there because this is a problem only if we use the
manual index, as that is the only source of intra-module paralelism.
Also, this only seems to occur for extremely simple files (like the ones
I've been creating for tests lately), where we've managed to start
indexing before loading the debug_str section. Then, two threads start
to load the section simultaneously and produce wrong results.

On more complex files, something seems to be loading the debug_str section
before we start indexing, as I haven't been able to reproduce this
there, but I have not investigated what it is.

I've tried to come up with a test for this, but I haven't been able to
reproduce the problem reliably. Still, while doing so, I created a way
to generate many compile units on demand. Given that most of our tests
work with only one or two compile units, it seems like this could be
useful anyway.

Reviewers: aprantl, JDevlieghere, clayborg

Subscribers: arphaman, lldb-commits

Differential Revision: https://reviews.llvm.org/D62316

llvm-svn: 361602
 		2019-05-24 08:04:03 +00:00
clang Do not resolve directory junctions for `-fdiagnostics-absolute-paths` on Windows. 2019-05-24 04:46:22 +00:00
clang-tools-extra [clang-tidy] Add option "LiteralInitializers" to cppcoreguidelines-pro-type-member-init 2019-05-24 05:46:57 +00:00
compiler-rt [libFuzzer] when using data-flow-trace (DFT) only load the DFT for the files present in the corpus 2019-05-24 00:43:52 +00:00
debuginfo-tests Set config.lit_tools_dir, which is needed by lit.llvm.initialize. 2018-11-06 21:54:27 +00:00
libclc travis: Add LLVM-8 build 2019-03-27 21:28:31 +00:00
libcxx fix test for older clang versions 2019-05-24 03:15:32 +00:00
libcxxabi [runtimes] Move libunwind, libc++abi and libc++ to lib/$target/c++ and include/c++ 2019-05-22 21:08:33 +00:00
libunwind [runtimes] Move libunwind, libc++abi and libc++ to lib/$target/c++ and include/c++ 2019-05-22 21:08:33 +00:00
lld [COFF] Remove finalizeContents virtual method from Chunk, NFC 2019-05-24 00:02:00 +00:00
lldb DWARFContext: Make loading of sections thread-safe 2019-05-24 08:04:03 +00:00
llgo IR: Support parsing numeric block ids, and emit them in textual output. 2019-03-22 18:27:13 +00:00
llvm [Power9] Add a specific heuristic to schedule the addi before the load 2019-05-24 05:30:09 +00:00
openmp [OPENMP][NVPTX]Fix barriers and parallel level counters, NFC. 2019-05-22 19:50:32 +00:00
parallel-libs Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
polly [DeLICM] Use polly::singleton to allow empty result. 2019-05-21 19:18:26 +00:00
pstl [pstl] Make the default backend be the serial backend and always provide parallel policies 2019-04-24 20:12:36 +00:00
.arcconfig Update monorepo .arcconfig with new project callsign. 2019-01-31 14:34:59 +00:00
.clang-format Add .clang-tidy and .clang-format files to the toplevel of the 2019-01-29 16:43:16 +00:00
.clang-tidy Disable tidy checks with too many hits 2019-02-01 11:20:13 +00:00
.gitignore Add a reduced copy of the llvm .gitignore 2019-04-09 00:52:49 +00:00
README.md
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README.md

The LLVM Compiler Infrastructure

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.