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struct CanonicalABIError: Error, CustomStringConvertible {
let description: String
}
/// Call context for `(canon lift)` or `(canon lower)` operations.
/// This type corresponds to `CallContext` in the Canonical ABI spec.
///
/// > Note:
/// <https://github.com/WebAssembly/component-model/blob/main/design/mvp/CanonicalABI.md#runtime-state>
public struct CanonicalCallContext {
/// The options used for lifting or lowering operations.
public let options: CanonicalOptions
/// The module instance that defines the lift/lower operation.
public let moduleInstance: ModuleInstance
/// The executing `Runtime` instance
public let runtime: Runtime
/// A reference to the guest memory.
public var guestMemory: GuestMemory {
GuestMemory(store: runtime.store, address: options.memory)
}
public init(options: CanonicalOptions, moduleInstance: ModuleInstance, runtime: Runtime) {
self.options = options
self.moduleInstance = moduleInstance
self.runtime = runtime
}
/// Call `cabi_realloc` export with the given arguments.
public func realloc(
old: UInt32,
oldSize: UInt32,
oldAlign: UInt32,
newSize: UInt32
) throws -> UnsafeGuestRawPointer {
guard let realloc = options.realloc else {
throw CanonicalABIError(description: "Missing required \"cabi_realloc\" export")
}
let results = try realloc.invoke(
[.i32(old), .i32(oldSize), .i32(oldAlign), .i32(newSize)], runtime: runtime
)
guard results.count == 1 else {
throw CanonicalABIError(description: "\"cabi_realloc\" export should return a single value")
}
guard case let .i32(new) = results[0] else {
throw CanonicalABIError(description: "\"cabi_realloc\" export should return an i32 value")
}
return UnsafeGuestRawPointer(memorySpace: guestMemory, offset: new)
}
}
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