provide more control over type ownership#598
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alexcrichton merged 3 commits intobytecodealliance:mainfrom Jun 28, 2023
Merged
provide more control over type ownership#598alexcrichton merged 3 commits intobytecodealliance:mainfrom
alexcrichton merged 3 commits intobytecodealliance:mainfrom
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This is the guest version of bytecodealliance/wasmtime#6648. This replaces the duplicate_if_necessary parameter to the Rust binding generator with a new ownership parameter which provides finer-grained control over whether and how generated types own their fields. The default is `Ownership::Owning`, which means types own their fields regardless of how they are used in functions. These types are passed by reference when used as parameters to guest-exported functions. Note that this also affects how unnamed types (e.g. `list<list<string>>`) are passed: using a reference only at the top level (e.g. `&[Vec<String>]` instead of `&[&[&str]]`, which is more difficult to construct when using non-'static data). The other option is `Ownership::Borrowing`, which includes a `duplicate_if_necessary` field, providing the same code generation strategy as was used prior to this change. Signed-off-by: Joel Dice <joel.dice@fermyon.com>
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Signed-off-by: Joel Dice <joel.dice@fermyon.com>
alexcrichton
approved these changes
Jun 28, 2023
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This is the guest version of bytecodealliance/wasmtime#6648.
This replaces the duplicate_if_necessary parameter to the Rust binding generator with a new ownership parameter which provides finer-grained control over whether and how generated types own their fields.
The default is
Ownership::Owning, which means types own their fields regardless of how they are used in functions. These types are passed by reference when used as parameters to guest-exported functions. Note that this also affects how unnamed types (e.g.list<list<string>>) are passed: using a reference only at the top level (e.g.&[Vec<String>]instead of&[&[&str]], which is more difficult to construct when using non-'static data).The other option is
Ownership::Borrowing, which includes aduplicate_if_necessaryfield, providing the same code generation strategy as was used prior to this change.