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/// A type representing a `canonopt` values supplied to currently-executing
/// `canon lift` or `canon lower`.
/// > Note:
/// <https://github.com/WebAssembly/component-model/blob/main/design/mvp/CanonicalABI.md#runtime-state>
public struct CanonicalOptions {
/// A type of string encoding used in the Component Model.
public enum StringEncoding {
/// UTF-8
case utf8
/// UTF-16
case utf16
/// Dynamic encoding of Latin-1 or UTF-16
case latin1OrUTF16
}
/// The memory address used for lifting or lowering operations.
public let memory: Memory
/// The string encoding used for lifting or lowering string values.
public let stringEncoding: StringEncoding
/// The realloc function address used for lifting or lowering values.
public let realloc: Function?
/// The function address called when a lifted/lowered function returns.
public let postReturn: Function?
public init(
memory: Memory, stringEncoding: StringEncoding,
realloc: Function?, postReturn: Function?
) {
self.memory = memory
self.stringEncoding = stringEncoding
self.realloc = realloc
self.postReturn = postReturn
}
/// FIXME: This deriviation is wrong because the options should be determined by `(canon lift)` or `(canon lower)`
/// in an encoded component at componetizing-time. (e.g. wit-component tool is one of the componetizers)
/// Remove this temporary method after we will accept binary form of component file.
public static func _derive(from instance: Instance, exportName: String) -> CanonicalOptions {
guard case let .memory(memory) = instance.exports["memory"] else {
fatalError("Missing required \"memory\" export")
}
return CanonicalOptions(
memory: memory, stringEncoding: .utf8,
realloc: instance.exportedFunction(name: "cabi_realloc"),
postReturn: instance.exportedFunction(name: "cabi_post_\(exportName)"))
}
}
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