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package space.autistic.radio.wasm
import com.dylibso.chicory.runtime.HostFunction
import com.dylibso.chicory.runtime.ImportFunction
import com.dylibso.chicory.runtime.Instance
import com.dylibso.chicory.wasm.types.Value
import com.dylibso.chicory.wasm.types.ValueType
import java.lang.invoke.MethodHandles
import java.lang.invoke.MethodType
import java.lang.reflect.Method
import java.lang.reflect.ParameterizedType
class Bindings {
companion object {
@JvmStatic
fun longToInt(long: Long): Int = long.toInt()
@JvmStatic
fun stringArg(instance: Instance, address: Long): String {
return instance.memory().readCString(address.toInt())
}
@JvmStatic
fun boolArg(bool: Long): Boolean {
return bool != 0L
}
@JvmStatic
fun intListArg(instance: Instance, argc: Long, argv: Long): List<Int> {
return IntArray(argc.toInt()) {
instance.memory().readInt(argv.toInt() + 4 * it)
}.toList()
}
private val lookup = MethodHandles.lookup()
fun bindFunc(
module: String,
name: String,
inLookup: MethodHandles.Lookup,
method: Method,
receiver: Any
): ImportFunction {
val baseHandle = inLookup.unreflect(method).bindTo(receiver)
val wasmParameters = ArrayList<ValueType>()
val filters = method.genericParameterTypes.map {
when (it) {
Int::class.java -> {
wasmParameters.add(ValueType.I32)
lookup.findStatic(
Bindings::class.java, "longToInt", MethodType.methodType(Int::class.java, Long::class.java)
)
}
Long::class.java -> {
wasmParameters.add(ValueType.I64)
MethodHandles.identity(Long::class.java)
}
Float::class.java -> {
wasmParameters.add(ValueType.F32)
lookup.findStatic(
Value::class.java, "longToFloat", MethodType.methodType(Float::class.java, Long::class.java)
)
}
Double::class.java -> {
wasmParameters.add(ValueType.F64)
lookup.findStatic(
Value::class.java,
"longToDouble",
MethodType.methodType(Double::class.java, Long::class.java)
)
}
String::class.java -> {
wasmParameters.add(ValueType.I32)
lookup.findStatic(
Bindings::class.java,
"stringArg",
MethodType.methodType(String::class.java, Instance::class.java, Long::class.java)
)
}
Boolean::class.java -> {
wasmParameters.add(ValueType.I32)
lookup.findStatic(
Bindings::class.java,
"boolArg",
MethodType.methodType(Boolean::class.java, Long::class.java)
)
}
is ParameterizedType -> {
if (it.rawType == List::class.java) {
val converter = when (it.actualTypeArguments[0]) {
java.lang.Integer::class.java -> "intListArg"
else -> throw IllegalArgumentException(it.actualTypeArguments[0].toString())
}
wasmParameters.add(ValueType.I32)
wasmParameters.add(ValueType.I32)
lookup.findStatic(
Bindings::class.java,
converter,
MethodType.methodType(
List::class.java,
Instance::class.java,
Long::class.java,
Long::class.java
)
)
} else {
throw IllegalArgumentException(it.toString())
}
}
else -> throw IllegalArgumentException(it.toString())
}
}
val filterTypes = ArrayList<Class<*>>()
filters.forEach { methodHandle ->
filterTypes.addAll(methodHandle.type().parameterList())
}
var i = 0
val permutation = IntArray(filterTypes.size) {
if (filterTypes[it] == Instance::class.java) 0 else ++i
}
var handle = baseHandle
var j = 0
filters.forEach {
handle = MethodHandles.collectArguments(handle, j, it)
j += it.type().parameterCount()
}
val newtype = MethodType.methodType(
baseHandle.type().returnType(), Instance::class.java, *Array(i) { Long::class.java })
handle = MethodHandles.permuteArguments(handle, newtype, *permutation)
handle = handle.asSpreader(LongArray::class.java, i)
return when (method.genericReturnType) {
Void.TYPE -> HostFunction(module, name, wasmParameters, emptyList()) { instance, args ->
handle.invokeExact(instance, args)
Value.EMPTY_VALUES
}
Void::class.java -> HostFunction(module, name, wasmParameters, emptyList()) { instance, args ->
handle.invokeExact(instance, args)
throw IllegalStateException("unreachable")
}
Int::class.java -> HostFunction(module, name, wasmParameters, listOf(ValueType.I32)) { instance, args ->
val result: Int = handle.invokeExact(instance, args) as Int
longArrayOf(result.toLong())
}
Boolean::class.java -> HostFunction(
module,
name,
wasmParameters,
listOf(ValueType.I32)
) { instance, args ->
val result: Boolean = handle.invokeExact(instance, args) as Boolean
longArrayOf(if (result) 1L else 0L)
}
Float::class.java -> HostFunction(
module,
name,
wasmParameters,
listOf(ValueType.F32)
) { instance, args ->
val result: Float = handle.invokeExact(instance, args) as Float
longArrayOf(Value.floatToLong(result))
}
else -> throw IllegalArgumentException(method.genericReturnType.toString())
}
}
}
}
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