public void EmitDeserialize(CompilerContext context, Local value)
{
var elementType = value.LocalType.GetElementType();
var emptyArrayLabel = context.Emit.DefineLabel();
var endLabel = context.Emit.DefineLabel();
using (var length = context.Emit.DeclareLocal <int>("length"))
{
// length = ProudNetBinaryReaderExtensions.ReadScalar(reader)
context.Emit.LoadReaderOrWriterParam();
context.Emit.Call(ReflectionHelper.GetMethod((BinaryReader _) => _.ReadScalar()));
context.Emit.StoreLocal(length);
// if(length < 1) {
// value = Array.Empty<>()
// return
// }
context.Emit.LoadLocal(length);
context.Emit.LoadConstant(1);
context.Emit.BranchIfLess(emptyArrayLabel);
// value = new [length]
context.Emit.LoadLocal(length);
context.Emit.NewArray(elementType);
context.Emit.StoreLocal(value);
// Little optimization for byte arrays
if (elementType == typeof(byte))
{
// value = reader.ReadBytes(length);
context.Emit.LoadReaderOrWriterParam();
context.Emit.LoadLocal(length);
context.Emit.Call(ReflectionHelper.GetMethod((BinaryReader _) => _.ReadBytes(default(int))));
context.Emit.StoreLocal(value);
}
else
{
var loopLabel = context.Emit.DefineLabel();
var loopCheckLabel = context.Emit.DefineLabel();
using (var element = context.Emit.DeclareLocal(elementType, "element"))
using (var i = context.Emit.DeclareLocal <int>("i"))
{
context.Emit.MarkLabel(loopLabel);
context.EmitDeserialize(element);
// value[i] = element
context.Emit.LoadLocal(value);
context.Emit.LoadLocal(i);
context.Emit.LoadLocal(element);
context.Emit.StoreElement(elementType);
// ++i
context.Emit.LoadLocal(i);
context.Emit.LoadConstant(1);
context.Emit.Add();
context.Emit.StoreLocal(i);
// i < length
context.Emit.MarkLabel(loopCheckLabel);
context.Emit.LoadLocal(i);
context.Emit.LoadLocal(length);
context.Emit.BranchIfLess(loopLabel);
}
}
context.Emit.Branch(endLabel);
}
// value = Array.Empty<>()
context.Emit.MarkLabel(emptyArrayLabel);
context.Emit.Call(typeof(Array)
.GetMethod(nameof(Array.Empty))
.GetGenericMethodDefinition()
.MakeGenericMethod(elementType));
context.Emit.StoreLocal(value);
context.Emit.MarkLabel(endLabel);
}
public void EmitDeserialize(CompilerContext context, Local value)
{
var elementType = value.LocalType.GetElementType();
var emptyArray = context.Emit.DefineLabel();
var end = context.Emit.DefineLabel();
using (var length = context.Emit.DeclareLocal <int>("length"))
{
context.EmitDeserialize(length);
// if(length < 1) {
// value = Array.Empty<>()
// return
// }
context.Emit.LoadLocal(length);
context.Emit.LoadConstant(1);
context.Emit.BranchIfLess(emptyArray);
// value = new [length]
context.Emit.LoadLocal(length);
context.Emit.NewArray(elementType);
context.Emit.StoreLocal(value);
var loop = context.Emit.DefineLabel();
var loopCheck = context.Emit.DefineLabel();
using (var element = context.Emit.DeclareLocal(elementType, "element"))
using (var i = context.Emit.DeclareLocal <int>("i"))
{
context.Emit.MarkLabel(loop);
// reader.ReadByte() -> index
context.Emit.LoadReaderOrWriterParam();
context.Emit.CallVirtual(ReflectionHelper.GetMethod((BinaryReader _) => _.ReadByte()));
context.Emit.Pop();
context.EmitDeserialize(element);
// value[i] = element
context.Emit.LoadLocal(value);
context.Emit.LoadLocal(i);
context.Emit.LoadLocal(element);
context.Emit.StoreElement(elementType);
// ++i
context.Emit.LoadLocal(i);
context.Emit.LoadConstant(1);
context.Emit.Add();
context.Emit.StoreLocal(i);
// i < length
context.Emit.MarkLabel(loopCheck);
context.Emit.LoadLocal(i);
context.Emit.LoadLocal(length);
context.Emit.BranchIfLess(loop);
}
context.Emit.Branch(end);
}
// value = Array.Empty<>()
context.Emit.MarkLabel(emptyArray);
context.Emit.Call(typeof(Array)
.GetMethod(nameof(Array.Empty))
.GetGenericMethodDefinition()
.MakeGenericMethod(elementType));
context.Emit.StoreLocal(value);
context.Emit.MarkLabel(end);
}