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();
}
}
}
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);
}
