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Heejin Ahn 9261ee32dc [WebAssembly] Make EH work with dynamic linking 
This makes Wasm EH work with dynamic linking. So far we were only able
to handle destructors, which do not use any tags or LSDA info.

1. This uses `TargetExternalSymbol` for `GCC_except_tableN` symbols,
   which points to the address of per-function LSDA info. It is more
   convenient to use than `MCSymbol` because it can take additional
   target flags.

2. When lowering `wasm_lsda` intrinsic, if PIC is enabled, make the
   symbol relative to `__memory_base` and generate the `add` node. If
   PIC is disabled, continue to use the absolute address.

3. Make tag symbols (`__cpp_exception` and `__c_longjmp`) undefined in
   the backend, because it is hard to make it work with dynamic
   linking's loading order. Instead, we make all tag symbols undefined
   in the LLVM backend and import it from JS.

4. Add support for undefined tags to the linker.

Companion patches:
- https://github.com/WebAssembly/binaryen/pull/4223
- https://github.com/emscripten-core/emscripten/pull/15266

Reviewed By: sbc100

Differential Revision: https://reviews.llvm.org/D111388
 		2021-10-12 23:28:27 -07:00
..
COFF [lld] fix typos to cycle bots 2021-10-12 17:03:39 -04:00
Common [lld] Fix small error in previous commit 2021-09-17 17:47:21 -07:00
ELF [lld] fix typos to cycle bots 2021-10-12 17:03:39 -04:00
MachO [lld] Use checkError more 2021-10-04 11:46:16 -04:00
MinGW [LLD] [MinGW] Add more options for disabling flags in the executable 2021-08-12 13:27:09 +03:00
cmake/modules [cmake] Add support for multiple distributions 2021-05-12 11:13:18 -07:00
docs [ELF] Add --why-extract= to query why archive members/lazy object files are extracted 2021-09-20 09:52:30 -07:00
include/lld [WebAssembly] Remove WasmTagType 2021-10-05 17:11:22 -07:00
lib [CMake][gn] lldMachO=>lldMachOOld, lldMachO2=>lldMachO 2021-08-04 18:52:41 -07:00
test [WebAssembly] Make EH work with dynamic linking 2021-10-12 23:28:27 -07:00
tools/lld [lld] Enable ANSI escape code for Windows 2021-09-09 16:51:11 -07:00
unittests [CMake][gn] lldMachO=>lldMachOOld, lldMachO2=>lldMachO 2021-08-04 18:52:41 -07:00
utils
…
wasm [WebAssembly] Make EH work with dynamic linking 2021-10-12 23:28:27 -07:00
.clang-format
…
.clang-tidy NFC: .clang-tidy: Inherit configs from parents to improve maintainability 2021-06-08 08:25:59 -07:00
.gitignore
…
CMakeLists.txt [LLVM][CMake][NFC] Resolve FIXME: Rename LLVM_CMAKE_PATH to LLVM_CMAKE_DIR throughout the project 2021-09-16 18:29:57 +02:00
CODE_OWNERS.TXT Add code owners of new MachO port 2020-09-02 19:32:12 -07:00
LICENSE.TXT
…
README.md [doc] Place sha256 in lld/README.md into backticks 2021-01-12 10:19:40 -08:00

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.