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Sergej Jaskiewicz 2899103108 [TimeProfiler] Emit clock synchronization point 
Time profiler emits relative timestamps for events (the number of
microseconds passed since the start of the current process).

This patch allows combining events from different processes while
preserving their relative timing by emitting a new attribute
"beginningOfTime". This attribute contains the system time that
corresponds to the zero timestamp of the time profiler.

This has at least two use cases:

- Build systems can use this to merge time traces from multiple compiler
  invocations and generate statistics for the whole build. Tools like
  ClangBuildAnalyzer could also leverage this feature.

- Compilers that use LLVM as their backend by invoking llc/opt in
  a child process. If such a compiler supports generating time traces
  of its own events, it could merge those events with LLVM-specific
  events received from llc/opt, and produce a more complete time trace.

A proof-of-concept script that merges multiple logs that
contain a synchronization point into one log:
https://github.com/broadwaylamb/merge_trace_events

Differential Revision: https://reviews.llvm.org/D78030
 		2020-04-23 01:09:31 +03:00
..
COFF [COFF] Assign unique identifiers to ObjFiles from LTO 2020-04-17 17:15:12 -07:00
Common [lld][COFF][ELF][WebAssembly] Replace --[no-]threads /threads[:no] with --threads={1,2,...} /threads:{1,2,...} 2020-03-31 08:46:12 -07:00
ELF [ELF] For relative paths in INPUT() and GROUP(), search the directory of the current linker script before searching other paths 2020-04-22 12:34:20 -07:00
MachO [lld-macho] Add basic support for linking against dylibs 2020-04-21 13:43:19 -07:00
MinGW Remove unused Endian.h includes, NFC 2020-03-11 15:45:34 -07:00
cmake/modules
…
docs [ELF] Add --warn-backrefs-exclude=<glob> 2020-04-20 07:52:15 -07:00
include/lld Reland D75382 "[lld] Initial commit for new Mach-O backend" 2020-04-02 12:03:43 -07:00
lib fix typo in comment to cycle bots 2020-04-04 12:52:45 -04:00
test [TimeProfiler] Emit clock synchronization point 2020-04-23 01:09:31 +03:00
tools/lld Enable new passmanager plugin support for LTO. 2020-04-14 15:07:07 -07:00
unittests Make llvm::StringRef to std::string conversions explicit. 2020-01-28 23:25:25 +01:00
utils Python 2/3 compatibility 2019-03-20 07:42:13 +00:00
wasm [WebAssembly] Fix faulty logic in verifyRelocTargets 2020-04-16 18:19:56 -07:00
.clang-format
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.clang-tidy [lld] Add .clang-tidy to customize readability-identifier-naming.{Member,Parameter,Variable}Case => camelBack 2020-03-09 08:26:41 -07:00
.gitignore
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CMakeLists.txt Reland D75382 "[lld] Initial commit for new Mach-O backend" 2020-04-02 12:03:43 -07:00
CODE_OWNERS.TXT
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LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
README.md
…

README.md

LLVM Linker (lld)

This directory and its subdirectories contain source code for the LLVM Linker, a modular cross platform linker which is built as part of the LLVM compiler infrastructure project.

lld is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.

Benchmarking

In order to make sure various developers can evaluate patches over the same tests, we create a collection of self contained programs.

It is hosted at https://s3-us-west-2.amazonaws.com/linker-tests/lld-speed-test.tar.xz

The current sha256 is 10eec685463d5a8bbf08d77f4ca96282161d396c65bd97dc99dbde644a31610f.