protected override void EmitRead(UcAsp.RPC.ProtoBuf.Compiler.CompilerContext ctx, UcAsp.RPC.ProtoBuf.Compiler.Local valueFrom)
{
/* This looks more complex than it is. Look at the non-compiled Read to
* see what it is trying to do, but note that it needs to cope with a
* few more scenarios. Note that it picks the **most specific** Add,
* unlike the runtime version that uses IList when possible. The core
* is just a "do {list.Add(readValue())} while {thereIsMore}"
*
* The complexity is due to:
* - value types vs reference types (boxing etc)
* - initialization if we need to pass in a value to the tail
* - handling whether or not the tail *returns* the value vs updates the input
*/
bool returnList = ReturnList;
using (Compiler.Local list = AppendToCollection ? ctx.GetLocalWithValue(ExpectedType, valueFrom) : new Compiler.Local(ctx, declaredType))
using (Compiler.Local origlist = (returnList && AppendToCollection && !Helpers.IsValueType(ExpectedType)) ? new Compiler.Local(ctx, ExpectedType) : null)
{
if (!AppendToCollection)
{ // always new
ctx.LoadNullRef();
ctx.StoreValue(list);
}
else if (returnList && origlist != null)
{ // need a copy
ctx.LoadValue(list);
ctx.StoreValue(origlist);
}
if (concreteType != null)
{
ctx.LoadValue(list);
Compiler.CodeLabel notNull = ctx.DefineLabel();
ctx.BranchIfTrue(notNull, true);
ctx.EmitCtor(concreteType);
ctx.StoreValue(list);
ctx.MarkLabel(notNull);
}
bool castListForAdd = !add.DeclaringType.IsAssignableFrom(declaredType);
EmitReadList(ctx, list, Tail, add, packedWireType, castListForAdd);
if (returnList)
{
if (AppendToCollection && origlist != null)
{
// remember ^^^^ we had a spare copy of the list on the stack; now we'll compare
ctx.LoadValue(origlist);
ctx.LoadValue(list); // [orig] [new-value]
Compiler.CodeLabel sameList = ctx.DefineLabel(), allDone = ctx.DefineLabel();
ctx.BranchIfEqual(sameList, true);
ctx.LoadValue(list);
ctx.Branch(allDone, true);
ctx.MarkLabel(sameList);
ctx.LoadNullRef();
ctx.MarkLabel(allDone);
}
else
{
ctx.LoadValue(list);
}
}
}
}
protected override void EmitRead(UcAsp.RPC.ProtoBuf.Compiler.CompilerContext ctx, UcAsp.RPC.ProtoBuf.Compiler.Local valueFrom)
{
Type listType;
#if NO_GENERICS
listType = typeof(BasicList);
#else
listType = ctx.MapType(typeof(System.Collections.Generic.List <>)).MakeGenericType(itemType);
#endif
Type expected = ExpectedType;
using (Compiler.Local oldArr = AppendToCollection ? ctx.GetLocalWithValue(expected, valueFrom) : null)
using (Compiler.Local newArr = new Compiler.Local(ctx, expected))
using (Compiler.Local list = new Compiler.Local(ctx, listType))
{
ctx.EmitCtor(listType);
ctx.StoreValue(list);
ListDecorator.EmitReadList(ctx, list, Tail, listType.GetMethod("Add"), packedWireType, false);
// leave this "using" here, as it can share the "FieldNumber" local with EmitReadList
using (Compiler.Local oldLen = AppendToCollection ? new UcAsp.RPC.ProtoBuf.Compiler.Local(ctx, ctx.MapType(typeof(int))) : null) {
Type[] copyToArrayInt32Args = new Type[] { ctx.MapType(typeof(Array)), ctx.MapType(typeof(int)) };
if (AppendToCollection)
{
ctx.LoadLength(oldArr, true);
ctx.CopyValue();
ctx.StoreValue(oldLen);
ctx.LoadAddress(list, listType);
ctx.LoadValue(listType.GetProperty("Count"));
ctx.Add();
ctx.CreateArray(itemType, null); // length is on the stack
ctx.StoreValue(newArr);
ctx.LoadValue(oldLen);
Compiler.CodeLabel nothingToCopy = ctx.DefineLabel();
ctx.BranchIfFalse(nothingToCopy, true);
ctx.LoadValue(oldArr);
ctx.LoadValue(newArr);
ctx.LoadValue(0); // index in target
ctx.EmitCall(expected.GetMethod("CopyTo", copyToArrayInt32Args));
ctx.MarkLabel(nothingToCopy);
ctx.LoadValue(list);
ctx.LoadValue(newArr);
ctx.LoadValue(oldLen);
}
else
{
ctx.LoadAddress(list, listType);
ctx.LoadValue(listType.GetProperty("Count"));
ctx.CreateArray(itemType, null);
ctx.StoreValue(newArr);
ctx.LoadAddress(list, listType);
ctx.LoadValue(newArr);
ctx.LoadValue(0);
}
copyToArrayInt32Args[0] = expected; // // prefer: CopyTo(T[], int)
MethodInfo copyTo = listType.GetMethod("CopyTo", copyToArrayInt32Args);
if (copyTo == null)
{ // fallback: CopyTo(Array, int)
copyToArrayInt32Args[1] = ctx.MapType(typeof(Array));
copyTo = listType.GetMethod("CopyTo", copyToArrayInt32Args);
}
ctx.EmitCall(copyTo);
}
ctx.LoadValue(newArr);
}
}