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13ca0c87ed
llvm-capstone/lld
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Ayke van Laethem 13ca0c87ed
[lld][WebAssembly] Align __heap_base 
__heap_base was not aligned. In practice, it will often be aligned
simply because it follows the stack, but when the stack is placed at the
beginning (with the --stack-first option), the __heap_base might be
unaligned. It could even be byte-aligned.

At least wasi-libc appears to expect that __heap_base is aligned:
659ff41456/dlmalloc/src/malloc.c (L5224)

While WebAssembly itself does not appear to require any alignment for
memory accesses, it is sometimes required when sharing a pointer
externally. For example, WASI might expect alignment up to 8:
https://github.com/WebAssembly/WASI/blob/main/phases/snapshot/docs.md#-timestamp-u64

This issue got introduced with the addition of the --stack-first flag:
https://reviews.llvm.org/D46141
I suspect the lack of alignment wasn't intentional here.

Differential Revision: https://reviews.llvm.org/D106499
2021-07-24 14:03:26 +02:00
..
cmake/modules [cmake] Add support for multiple distributions 2021-05-12 11:13:18 -07:00
COFF [LLD] [COFF] Make -export-all-symbols work as intended for EXEs 2021-07-22 23:34:03 +03:00
Common [lld] Rename StringRef _lower() method calls to _insensitive() 2021-06-25 00:22:01 +03:00
docs [lld][WebAssembly] Add new --import-undefined option 2021-06-17 11:44:21 -07:00
ELF [ELF] --gc-sections: allow GC on reserved sections in a group 2021-07-22 17:09:23 -07:00
include/lld [WebAssembly] Rename event to tag 2021-06-17 20:34:19 -07:00
lib [OptTable] Rename PrintHelp to printHelp 2021-06-24 14:47:03 -07:00
MachO [lld/mac] Fix start-stop.s test with expensive checks enabled 2021-07-23 17:01:16 -04:00
MinGW [LLD] [COFF] Fix up missing stdcall decorations in MinGW mode 2021-07-02 09:49:14 +03:00
test [lld][WebAssembly] Align __heap_base 2021-07-24 14:03:26 +02:00
tools/lld [lld] Rename StringRef _lower() method calls to _insensitive() 2021-06-25 00:22:01 +03:00
unittests
utils
wasm [lld][WebAssembly] Align __heap_base 2021-07-24 14:03:26 +02:00
.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 Fix lld macho standalone build by including llvm/Config/llvm-config.h instead of llvm/Config/config.h 2021-05-19 11:15:07 -04:00
CODE_OWNERS.TXT
LICENSE.TXT
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.