internal sealed override void CompileIKVM(IKVMCompilationContext context, IKVM.Reflection.Universe universe)
{
Assert(context != null);
var returns = context.Signature.RawReturnTypes;
var stack = context.Stack;
Assert(stack != null);
var returnsLength = returns.Length;
Assert(returnsLength == 0 || returnsLength == 1); //WebAssembly doesn't currently offer multiple returns, which should be blocked earlier.
var stackCount = stack.Count;
if (stackCount < returnsLength)
{
throw new StackTooSmallException(OpCode.Return, returnsLength, 0);
}
if (stackCount > returnsLength)
{
if (returnsLength == 0)
{
for (var i = 0; i < stackCount - returnsLength; i++)
{
context.Emit(IKVM.Reflection.Emit.OpCodes.Pop);
}
}
else
{
var value = context.DeclareLocal(universe.Import(returns[0].ToSystemType()));
context.Emit(IKVM.Reflection.Emit.OpCodes.Stloc, value.LocalIndex);
for (var i = 0; i < stackCount - returnsLength; i++)
{
context.Emit(IKVM.Reflection.Emit.OpCodes.Pop);
}
context.Emit(IKVM.Reflection.Emit.OpCodes.Ldloc, value.LocalIndex);
}
}
else if (returnsLength == 1)
{
var type = stack.Pop();
if (type != returns[0])
{
throw new StackTypeInvalidException(OpCode.Return, returns[0], type);
}
}
context.Emit(IKVM.Reflection.Emit.OpCodes.Ret);
}