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Change functions to have one return value #206

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alexcrichton
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This commit changes wit-defined functions to have precisely one return
value instead of a list of return values. This matches the upstream
component-model draft specification and canonical ABI. The main fallout
here is that the spidermonkey tests stopped testing multiple-returns
since while multi-value was implemented struct lifting/lowering is not
yet implemented. Otherwise this is relatively straightforward although
there are a few gotchas here and there as some language like JS, Python,
and C don't have native tuple types and we still want to generate
reasonable-ish code.

@alexcrichton
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Note that this is stacked on #205 and #204, both of which are prerequisites for this to work.

This commit changes wit-defined functions to have precisely one return
value instead of a list of return values. This matches the upstream
component-model draft specification and canonical ABI. The main fallout
here is that the spidermonkey tests stopped testing multiple-returns
since while multi-value was implemented struct lifting/lowering is not
yet implemented. Otherwise this is relatively straightforward although
there are a few gotchas here and there as some language like JS, Python,
and C don't have native tuple types and we still want to generate
reasonable-ish code.
@alexcrichton alexcrichton merged commit 2f422f8 into bytecodealliance:main Apr 22, 2022
@alexcrichton alexcrichton deleted the function-one-return branch April 22, 2022 13:58
willemneal pushed a commit to AhaLabs/wit-bindgen that referenced this pull request May 31, 2022
This commit changes wit-defined functions to have precisely one return
value instead of a list of return values. This matches the upstream
component-model draft specification and canonical ABI. The main fallout
here is that the spidermonkey tests stopped testing multiple-returns
since while multi-value was implemented struct lifting/lowering is not
yet implemented. Otherwise this is relatively straightforward although
there are a few gotchas here and there as some language like JS, Python,
and C don't have native tuple types and we still want to generate
reasonable-ish code.
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2 participants