private void EmitWriteArrayLoop(Compiler.CompilerContext ctx, Compiler.Local i, Compiler.Local arr)
{
// i = 0
ctx.LoadValue(0);
ctx.StoreValue(i);
// range test is last (to minimise branches)
Compiler.CodeLabel loopTest = ctx.DefineLabel(), processItem = ctx.DefineLabel();
ctx.Branch(loopTest, false);
ctx.MarkLabel(processItem);
// {...}
ctx.LoadArrayValue(arr, i);
if (SupportNull)
{
Tail.EmitWrite(ctx, null);
}
else
{
ctx.WriteNullCheckedTail(itemType, Tail, null);
}
// i++
ctx.LoadValue(i);
ctx.LoadValue(1);
ctx.Add();
ctx.StoreValue(i);
// i < arr.Length
ctx.MarkLabel(loopTest);
ctx.LoadValue(i);
ctx.LoadLength(arr, false);
ctx.BranchIfLess(processItem, false);
}
private void EmitReadEndPacked(Compiler.CompilerContext ctx, Compiler.Local list, Compiler.Local oldArr,
Compiler.Local newArr, Type listType)
{
// leave this "using" here, as it can share the "FieldNumber" local with EmitReadList
using(Compiler.Local oldLen = AppendToCollection ? new ProtoBuf.Compiler.Local(ctx, typeof(int)) : null) {
Type[] copyToArrayInt32Args = new Type[] { typeof(Array), 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(ExpectedType.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] = ExpectedType; // // prefer: CopyTo(T[], int)
MethodInfo copyTo = listType.GetMethod("CopyTo", copyToArrayInt32Args);
if (copyTo == null)
{ // fallback: CopyTo(Array, int)
copyToArrayInt32Args[1] = typeof(Array);
copyTo = listType.GetMethod("CopyTo", copyToArrayInt32Args);
}
ctx.EmitCall(copyTo);
}
ctx.LoadValue(newArr);
}
