Describe legacy commands. #288
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The core idea of new-style commands is that all function exports are command entrypoints, and they expect to be called on a fresh instance which lives only for the direction of the call. This is a generalization of the existing `_start` convention, which already has the expectation of a fresh instance which lives only for the direction of the call, and is one of the pieces need to enable user-defined command entrypoints which don't take string arguments and don't return an i32 status code. To show how this works in practice, the following patches implement this new behavior in wasm-ld and wasi-libc: - https://reviews.llvm.org/D81689 - WebAssembly/wasi-libc#203
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This adds documentation for what is now the legacy application API. This documents behavior already implemented in clang and wasi-sdk, so my inclination is to merge it to document the current code. Any objections? |
sbc100
approved these changes
Mar 17, 2022
linclark
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Mar 17, 2022
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Title and description updated. It was "new-style" at the time it was being developed, but now it's being subsumed by the component model. |
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The core idea of legacy commands is that all function exports are
command entrypoints, and they expect to be called on a fresh instance
which lives only for the direction of the call.
This is a generalization of the existing
_startconvention, whichalready has the expectation of a fresh instance which lives only for
the direction of the call, and is one of the pieces need to enable
user-defined command entrypoints which don't take string arguments and
don't return an i32 status code.
To show how this works in practice, the following patches implement
this new behavior in wasm-ld and wasi-libc: