/// <summary>
/// Returns a handle to a helper function for creating a new Object instance from the
/// keys and values on the stack. This is used for the newobject ABC instruction. The keys
/// must be of the String type and the values must be of the "any" type.
/// </summary>
/// <param name="size">The size argument to the newarray instruction, i.e. the number of
/// key-value pairs on the stack.</param>
/// <param name="handle">If a helper function is available or can be emitted, a handle to
/// the function is set to this argument.</param>
/// <returns>True if a helper function is available or can be created, otherwise false.</returns>
public bool tryGetNewObjectHelper(int size, out EntityHandle handle)
{
handle = default;
if (size > newObjectHelperMaxSize)
{
return(false);
}
if (m_newObjectHelperMethods[size] != null)
{
handle = m_newObjectHelperMethods[size].handle;
return(true);
}
_createContainerTypeIfNotCreated();
TypeSignature[] parameterTypes = new TypeSignature[size * 2];
var typeSigForString = TypeSignature.forPrimitiveType(PrimitiveTypeCode.String);
var typeSigForAny = m_assemblyBuilder.metadataContext.getTypeSignature(typeof(ASAny));
for (int i = 0; i < parameterTypes.Length; i++)
{
parameterTypes[i] = ((i & 1) == 0) ? typeSigForString : typeSigForAny;
}
string methodName = "newobject" + size.ToString(CultureInfo.InvariantCulture);
var methodBuilder = m_containerType !.defineMethod(
methodName,
MethodAttributes.Public | MethodAttributes.Static,
m_assemblyBuilder.metadataContext.getTypeSignature(typeof(ASObject)),
parameterTypes
);
m_ilBuilder.reset();
var objLocal = m_ilBuilder.declareLocal(typeof(ASObject));
var dpLocal = m_ilBuilder.declareLocal(typeof(DynamicPropertyCollection));
m_ilBuilder.emit(ILOp.newobj, KnownMembers.objectCtor);
m_ilBuilder.emit(ILOp.dup);
m_ilBuilder.emit(ILOp.call, KnownMembers.getObjectDynamicPropCollection, 0);
m_ilBuilder.emit(ILOp.stloc, dpLocal);
m_ilBuilder.emit(ILOp.stloc, objLocal);
// Object properties are set in top-to-bottom stack order.
// So for example if the arguments are "a", 1, "b", 2, "a", 3 then the value of the property
// "a" in the created object is 1, not 3.
for (int i = size - 1; i >= 0; i--)
{
m_ilBuilder.emit(ILOp.ldloc, dpLocal);
m_ilBuilder.emit(ILOp.ldarg, 2 * i);
m_ilBuilder.emit(ILOp.ldarg, 2 * i + 1);
m_ilBuilder.emit(ILOp.ldc_i4_1); // isEnum = true
m_ilBuilder.emit(ILOp.call, KnownMembers.dynamicPropCollectionSet, -4);
}
m_ilBuilder.emit(ILOp.ldloc, objLocal);
m_ilBuilder.emit(ILOp.ret);
methodBuilder.setMethodBody(m_ilBuilder.createMethodBody());
m_newObjectHelperMethods[size] = methodBuilder;
handle = methodBuilder.handle;
return(true);
}