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import WASI
import WasmKit
public typealias WASIBridgeToHost = WASI.WASIBridgeToHost
extension WASIBridgeToHost {
/// Register the WASI implementation to the given `imports`.
///
/// - Parameters:
/// - imports: The imports scope to register the WASI implementation.
/// - store: The store to create the host functions.
public func link(to imports: inout Imports, store: Store) {
for (moduleName, module) in wasiHostModules {
for (name, function) in module.functions {
imports.define(
module: moduleName,
name: name,
Function(store: store, type: function.type, body: makeHostFunction(function))
)
}
}
}
@available(*, deprecated, renamed: "link(to:store:)", message: "Use `Engine`-based API instead")
public var hostModules: [String: HostModule] {
wasiHostModules.mapValues { (module: WASIHostModule) -> HostModule in
HostModule(
functions: module.functions.mapValues { function -> HostFunction in
HostFunction(type: function.type, implementation: makeHostFunction(function))
})
}
}
private func makeHostFunction(_ function: WASIHostFunction) -> ((Caller, [Value]) throws -> [Value]) {
{ caller, values -> [Value] in
guard case let .memory(memory) = caller.instance?.export("memory") else {
throw WASIError(description: "Missing required \"memory\" export")
}
return try function.implementation(memory, values)
}
}
/// Start a WASI application as a `command` instance.
///
/// See <https://github.com/WebAssembly/WASI/blob/main/legacy/application-abi.md>
/// for more information about the WASI Preview 1 Application ABI.
///
/// - Parameter instance: The WASI application instance.
/// - Returns: The exit code returned by the WASI application.
public func start(_ instance: Instance) throws -> UInt32 {
do {
guard let start = instance.exports[function: "_start"] else {
throw WASIError(description: "Missing required \"_start\" function")
}
_ = try start()
} catch let code as WASIExitCode {
return code.code
}
return 0
}
/// Start a WASI application as a `reactor` instance.
///
/// See <https://github.com/WebAssembly/WASI/blob/main/legacy/application-abi.md>
/// for more information about the WASI Preview 1 Application ABI.
///
/// - Parameter instance: The WASI application instance.
public func initialize(_ instance: Instance) throws {
if let initialize = instance.exports[function: "_initialize"] {
// Call the optional `_initialize` function.
_ = try initialize()
}
}
@available(*, deprecated, message: "Use `Engine`-based API instead")
public func start(_ instance: Instance, runtime: Runtime) throws -> UInt32 {
return try start(instance)
}
}
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