File: FuzzExecute.swift

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@_spi(Fuzzing) import WasmKit
import WasmKitFuzzing

@_cdecl("LLVMFuzzerTestOneInput")
public func FuzzCheck(_ start: UnsafePointer<UInt8>, _ count: Int) -> CInt {
    let bytes = Array(UnsafeBufferPointer(start: start, count: count))
    do {
        let module = try WasmKit.parseWasm(bytes: bytes)
        let engine = WasmKit.Engine()
        let store = WasmKit.Store(engine: engine)
        store.resourceLimiter = FuzzerResourceLimiter()
        let instance = try module.instantiate(store: store)
        for export in instance.exports.values {
            guard case let .function(fn) = export else {
                continue
            }
            let type = fn.type
            let arguments = type.parameters.map { $0.defaultValue }
            _ = try fn(arguments)
        }
    } catch {
        // Ignore errors
    }
    return 0
}

extension ValueType {
    var defaultValue: Value {
        switch self {
        case .i32: return .i32(0)
        case .i64: return .i64(0)
        case .f32: return .f32(0)
        case .f64: return .f64(0)
        case .ref(.funcRef): return .ref(.function(0))
        case .ref(.externRef): return .ref(.extern(0))
        }
    }
}