Crate wasmtime_asm_macros
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This crate defines a macro named asm_func! which is suitable for
generating a single global_asm!-defined function.
This macro takes care of platform-specific directives to get the symbol
attributes correct (e.g. ELF symbols get a size and are flagged as a
function) and additionally handles visibility across platforms. All symbols
should be visible to Rust but not visible externally outside of a *.so.
It also exports a an asm_sym! macro which can be used to reference symbols
from within global_asm!-defined functions, and handles adding the leading
underscore that macOS prepends to symbols for you.