void EmitNonNullWriter(WriterEmitContext ctx)
{
var il = ctx.Il;
if (ctx.HasManifestToWrite)
{
ctx.WriteManifest();
}
using (ctx.GetLocal <int>(out var offset))
{
ctx.LoadCurrentOffset();
il.Store(offset);
// add 2 for the length of variable
il.LoadIntValue(2);
ctx.AddToCurrentOffset();
Writer.EmitWrite(ctx);
// stack empty, value written directly to the buffer
ctx.LoadBuffer(offset); // stack: byte*
ctx.LoadCurrentOffset();
il.Load(offset);
il.Emit(OpCodes.Sub); // stack: byte*, value
il.LoadIntValue(2);
il.Emit(OpCodes.Sub); // -2 for length
il.StoreIndirectLittleEndian(typeof(short)); // save length
}
}
public void EmitWrite(WriterEmitContext context)
{
var il = context.Il;
foreach (var field in fields)
{
var writer = AllWriters.GetWriter(field);
var manifest = GetManifestValue(field);
void LoadValue()
{
il.Emit(writer.RequiresAddress ? OpCodes.Ldflda : OpCodes.Ldfld, field);
}
using (context.Scope(LoadValue, manifest: manifest))
{
// if the writer does not write manifest, this will write manifest for the writer
if (writer is IWriteManifest == false)
{
context.WriteManifest();
}
writer.EmitWrite(context);
}
if (writer is IUpdateOffset == false)
{
context.AddToCurrentOffset();
}
}
}
void EmitClassWriter(WriterEmitContext ctx)
{
var il = ctx.Il;
var nullLbl = il.DefineLabel();
var end = il.DefineLabel();
ctx.LoadValue();
il.Emit(OpCodes.Brfalse, nullLbl);
EmitNonNullWriter(ctx);
il.Emit(OpCodes.Br, end);
// writing null
il.MarkLabel(nullLbl);
if (ctx.HasManifestToWrite == false)
{
ctx.LoadBuffer();
il.LoadIntValue(NullLength);
il.StoreIndirectLittleEndian(typeof(short));
il.LoadIntValue(2); // used only 2 bytes for writing null
ctx.AddToCurrentOffset();
}
else
{
// no value, nothing to write
}
il.MarkLabel(end);
}
public void EmitSizeEstimator(WriterEmitContext context)
{
if (Type.IsValueType)
{
writer.EmitSizeEstimator(context);
}
else
{
var il = context.Il;
var nullLbl = il.DefineLabel();
var end = il.DefineLabel();
context.LoadValue();
il.Emit(OpCodes.Brfalse, nullLbl);
writer.EmitSizeEstimator(context);
il.LoadIntValue(2);
il.Emit(OpCodes.Add);
il.Emit(OpCodes.Br_S, end);
il.MarkLabel(nullLbl);
il.LoadIntValue(2);
il.MarkLabel(end);
}
}
public void EmitWrite(WriterEmitContext context)
{
context.LoadBuffer();
context.LoadValue();
context.CallWriteStringUnsafe();
context.AddToCurrentOffset();
}
public void EmitSizeEstimator(WriterEmitContext ctx)
{
var il = ctx.Il;
using (ctx.GetLocal <int>(out var varSize))
{
il.LoadIntValue(0);
il.Store(varSize);
foreach (var field in varSizeFields)
{
var writer = GetVarSizeWriter(field);
void LoadValue()
{
il.Emit(writer.RequiresAddress ? OpCodes.Ldflda : OpCodes.Ldfld, field);
}
using (ctx.Scope(LoadValue))
{
writer.EmitSizeEstimator(ctx);
}
// add to already counted bytes
il.Load(varSize);
il.Emit(OpCodes.Add);
il.Store(varSize);
}
il.Load(varSize);
il.LoadIntValue(size);
il.Emit(OpCodes.Add);
}
}
public override void EmitSizeEstimator(WriterEmitContext context)
{
using (context.GetLocal <int>(out var sum))
{
LoopOver(context, (ctx, loadValue) =>
{
using (context.Scope(loadValue))
{
itemWriter.EmitSizeEstimator(ctx);
}
// stack: size
ctx.Il.Load(sum);
ctx.Il.Emit(OpCodes.Add);
ctx.Il.Store(sum); // add and store in the sum
});
var il = context.Il;
il.Load(sum);
// add 2 for the count
il.LoadIntValue(2);
il.Emit(OpCodes.Add);
}
}
public override void EmitWriteImpl(WriterEmitContext context)
{
//IL_0001: brtrue.s IL_0006
//IL_0003: ldc.i4.0
//IL_0004: br.s IL_0007
//IL_0006: ldc.i4.1
//IL_0007: conv.u1
var il = context.Il;
var load1 = il.DefineLabel();
var conversionU1 = il.DefineLabel();
il.Emit(OpCodes.Brtrue_S, load1);
il.Emit(OpCodes.Ldc_I4_0);
il.Emit(OpCodes.Br_S, conversionU1);
il.MarkLabel(load1);
il.Emit(OpCodes.Ldc_I4_1);
il.MarkLabel(conversionU1);
il.Emit(OpCodes.Conv_U1);
// store
il.Emit(OpCodes.Stind_I1);
}
public void EmitWrite(WriterEmitContext context)
{
context.LoadBuffer();
context.LoadValue();
EmitWriteImpl(context);
}
public EmitScope(WriterEmitContext context, Action loadValue, EmitScope parent, bool chainUp, ushort?manifest)
{
this.context = context;
this.loadValue = loadValue;
this.parent = parent;
this.chainUp = chainUp;
this.manifest = manifest;
}
void WriteValue(WriterEmitContext context)
{
itemWriter.EmitWrite(context);
if (itemWriter is IUpdateOffset == false)
{
context.AddToCurrentOffset();
}
}
public void EmitWrite(WriterEmitContext context)
{
var nullable = typeof(TPrimitive?);
var il = context.Il;
var hasValue = il.DefineLabel();
var end = il.DefineLabel();
context.LoadValue();
il.EmitCall(OpCodes.Call, nullable.GetProperty(nameof(Nullable <int> .HasValue)).GetGetMethod(), null);
il.Emit(OpCodes.Brtrue_S, hasValue);
// no value, just store 0 and return length = 1
if (context.HasManifestToWrite == false)
{
context.LoadBuffer();
il.LoadIntValue(0);
il.Emit(OpCodes.Stind_I1);
il.LoadIntValue(1);
il.Emit(OpCodes.Br, end); // jump to the end of writing
}
else
{
il.LoadIntValue(0);
il.Emit(OpCodes.Br, end); // jump to the end of writing
}
// has value, store 1, then store value
il.MarkLabel(hasValue);
if (context.HasManifestToWrite == false)
{
context.LoadBuffer();
il.LoadIntValue(1);
il.Emit(OpCodes.Stind_I1);
il.LoadIntValue(1);
context.AddToCurrentOffset();
}
else
{
context.WriteManifest();
}
// load shifted buffer and value
context.LoadBuffer();
context.LoadValue();
il.EmitCall(OpCodes.Call, nullable.GetProperty(nameof(Nullable <int> .Value)).GetGetMethod(), null);
// emit regular
Emit(context);
il.MarkLabel(end);
}
public void EmitWrite(WriterEmitContext context)
{
if (Type.IsValueType)
{
EmitNonNullWriter(context);
}
else
{
EmitClassWriter(context);
}
}
void WriteValue(WriterEmitContext context, Action loadValue)
{
using (context.Scope(loadValue))
{
itemWriter.EmitWrite(context);
}
if (itemWriter is IUpdateOffset == false)
{
context.AddToCurrentOffset();
}
}
public void EmitWrite(WriterEmitContext context)
{
using (context.GetLocal(typeof(Span <T>), out var span))
{
context.LoadValue();
context.Il.EmitCall(OpCodes.Call, Type.GetProperty(nameof(Memory <T> .Span)).GetGetMethod(), null);
context.Il.Store(span);
using (context.OverrideScope(spanWriter, span))
{
spanWriter.EmitWrite(context);
}
}
}
protected void LoopOver(WriterEmitContext context, Action <WriterEmitContext, Action> useValue)
{
var il = context.Il;
using (context.GetLocal <int>(out var i))
{
var check = il.DefineLabel();
var start = il.DefineLabel();
il.LoadIntValue(0);
il.Store(i);
il.Emit(OpCodes.Br, check);
il.MarkLabel(start);
void LoadElementValue()
{
il.Load(i);
if (itemWriter.RequiresAddress)
{
il.Emit(OpCodes.Ldelema, typeof(T));
}
else
{
il.LoadElem(typeof(T));
}
}
useValue(context, LoadElementValue);
// i++
il.LoadIntValue(1);
il.Load(i);
il.Emit(OpCodes.Add);
il.Store(i);
// check boundaries
il.MarkLabel(check);
il.Load(i);
context.LoadValue();
il.Emit(OpCodes.Ldlen);
il.Emit(OpCodes.Conv_I4);
il.Emit(OpCodes.Blt, start);
}
}
public override void EmitSizeEstimator(WriterEmitContext context)
{
context.LoadValue();
var il = context.Il;
il.Emit(OpCodes.Ldlen);
il.Emit(OpCodes.Conv_I4);
il.LoadIntValue(itemWriter.Size);
il.Emit(OpCodes.Mul);
il.Emit(OpCodes.Conv_Ovf_I2);
// add 2 for the count
il.LoadIntValue(2);
il.Emit(OpCodes.Add);
}
public void EmitSizeEstimator(WriterEmitContext ctx)
{
var il = ctx.Il;
if (itemWriter is IBoundedSizeWriter bounded)
{
EmitCount(ctx);
il.LoadIntValue(bounded.Size);
il.Emit(OpCodes.Mul);
il.Emit(OpCodes.Conv_Ovf_I2);
// add 2 for the count
il.LoadIntValue(2);
il.Emit(OpCodes.Add);
}
else if (itemWriter is IVarSizeWriter varSize)
{
using (ctx.GetLocal <int>(out var sum))
{
// zero value
il.LoadIntValue(0);
il.Store(sum);
Enumerate(ctx, () =>
{
varSize.EmitSizeEstimator(ctx);
// stack: size
ctx.Il.Load(sum);
ctx.Il.Emit(OpCodes.Add);
ctx.Il.Store(sum); // add and store in the sum
});
il.Load(sum);
// add 2 for the count
il.LoadIntValue(2);
il.Emit(OpCodes.Add);
}
}
else
{
throw new NotImplementedException($"The type of writer {itemWriter.GetType()} is not currently handled");
}
}
public void EmitWrite(WriterEmitContext context)
{
var il = context.Il;
using (context.GetLocal <int>(out var length))
{
context.LoadValue();
il.EmitCall(OpCodes.Call, typeof(Span <byte>).GetProperty(nameof(Span <byte> .Length)).GetGetMethod(), null);
il.Store(length);
context.LoadValue(); // stack: span
context.LoadBuffer(); // stack: span, buffer
il.Load(length); // stack: span, buffer, length
il.Emit(OpCodes.Newobj, typeof(Span <byte>).GetConstructor(new[] { typeof(void).MakePointerType(), typeof(int) })); //stack: span-source, span-dest
il.EmitCall(OpCodes.Call, typeof(Span <byte>).GetMethod(nameof(Span <byte> .CopyTo)), null);
il.Load(length);
context.AddToCurrentOffset();
}
}
public override void EmitWriteImpl(WriterEmitContext context)
{
context.Il.Emit(OpCodes.Stobj, typeof(Guid));
}
protected abstract void Emit(WriterEmitContext context);
public override void EmitWriteImpl(WriterEmitContext context)
{
context.Il.Emit(OpCodes.Stind_I1);
}
protected override void Emit(WriterEmitContext context)
{
wrapped.EmitWriteImpl(context);
}
public abstract void EmitWriteImpl(WriterEmitContext context);
protected override void Emit(WriterEmitContext context)
{
wrapped.EmitWriteImpl(context);
context.Il.LoadIntValue(wrapped.Size);
}
public override void EmitWriteImpl(WriterEmitContext context)
{
context.CallZigInt();
context.CallWriteUInt32Variant();
}
protected void Enumerate(WriterEmitContext context, Action consumeValue)
{
var il = context.Il;
var getEnumerator = Type.GetMethod(nameof(IEnumerable <int> .GetEnumerator), BindingFlags.FlattenHierarchy | BindingFlags.Public | BindingFlags.Instance);
var enumeratorType = getEnumerator.ReturnType;
var enumeratorCurrentType = enumeratorType.GetProperty(nameof(IEnumerator <int> .Current)).PropertyType;
var isEnumeratorByRef = enumeratorCurrentType.IsByRef;
var current = enumeratorType.GetProperty(nameof(IEnumerator <int> .Current)).GetMethod;
var moveNext = enumeratorType.GetMethod(nameof(IEnumerator <int> .MoveNext), BindingFlags.FlattenHierarchy | BindingFlags.Public | BindingFlags.Instance);
if (moveNext == null && enumeratorType.IsGenericType && enumeratorType.GetGenericTypeDefinition() == typeof(IEnumerator <>))
{
moveNext = typeof(IEnumerator).GetMethod(nameof(IEnumerator.MoveNext));
}
using (context.GetLocal(enumeratorType, out var enumerator))
{
context.LoadValue();
il.EmitCall(enumeratorType.IsValueType ? OpCodes.Call : OpCodes.Callvirt, getEnumerator, null);
il.Store(enumerator);
// try
var enumeratorIsDisposable = typeof(IDisposable).IsAssignableFrom(enumeratorType);
if (enumeratorIsDisposable)
{
il.BeginExceptionBlock();
}
// iterate over values
var processLbl = il.DefineLabel();
var loadLbl = il.DefineLabel();
var outOfFinally = il.DefineLabel();
il.Emit(OpCodes.Br, loadLbl);
il.MarkLabel(processLbl);
// true, false
if (itemWriter.RequiresAddress & !isEnumeratorByRef)
{
using (context.GetLocal(itemWriter.Type, out var value))
{
il.CallOn(enumerator, current);
il.Store(value);
using (context.OverrideScope(itemWriter, value))
{
consumeValue();
}
}
}
// true, true
// false, false
if (itemWriter.RequiresAddress ^ isEnumeratorByRef == false)
{
void LoadValue()
{
il.CallOn(enumerator, current);
}
using (context.Scope(LoadValue, false))
{
consumeValue();
}
}
// false, true
if (!itemWriter.RequiresAddress & isEnumeratorByRef)
{
void LoadValue()
{
il.CallOn(enumerator, current);
il.LoadIndirect(itemWriter.Type);
}
using (context.Scope(LoadValue, false))
{
consumeValue();
}
}
il.MarkLabel(loadLbl);
il.CallOn(enumerator, moveNext);
il.Emit(OpCodes.Brtrue, processLbl);
if (enumeratorIsDisposable)
{
il.Emit(OpCodes.Leave, outOfFinally);
// finally
il.BeginFinallyBlock();
var nullLbl = il.DefineLabel();
il.Load(enumerator);
il.Emit(OpCodes.Brfalse, nullLbl);
il.Load(enumerator);
il.EmitCall(OpCodes.Callvirt, typeof(IDisposable).GetMethod(nameof(IDisposable.Dispose)), null);
il.MarkLabel(nullLbl);
il.EndExceptionBlock();
il.MarkLabel(outOfFinally);
}
}
}
public void EmitWrite(WriterEmitContext context)
{
Enumerate(context, () => WriteValue(context));
}
public override void EmitWriteImpl(WriterEmitContext context)
{
context.Il.StoreIndirectLittleEndian(typeof(ushort));
}
public void EmitSizeEstimator(WriterEmitContext context)
{
context.LoadValue();
context.Il.EmitCall(OpCodes.Call, typeof(Memory <T>).GetProperty(nameof(Memory <T> .Length)).GetGetMethod(), null);
}