private static Action <Hashtable, Array, int> EmitCopyValues()
{
/*
* private void CopyValues(Hashtable hashtable, Array array, int arrayLength)
* {
* bucket[] buckets = hashtable.buckets;
* int length = buckets.Length;
* int arrayIndex = 0;
* while (--length >= 0)
* {
* object key = buckets[length].key;
* if ((key != null) && (key != hashtable.buckets))
* {
* if (arrayIndex >= arrayLength)
* return;
* array.SetValue(buckets[length].val, arrayIndex++);
* }
* }
* }
*/
var dynamicMethod = new DynamicMethod(
Guid.NewGuid().ToString(), typeof(void), new[] { typeof(Hashtable), typeof(Array), typeof(int) },
typeof(Hashtable), true);
var bucketsFieldInfo = typeof(Hashtable).GetField("buckets",
BindingFlags.Instance | BindingFlags.NonPublic);
var bucketType = typeof(Hashtable).GetNestedType("bucket", BindingFlags.NonPublic);
var bucketArrayType = bucketType.MakeArrayType();
var keyFieldInfo = bucketType.GetField("key", BindingFlags.Instance | BindingFlags.Public);
var valFieldInfo = bucketType.GetField("val", BindingFlags.Instance | BindingFlags.Public);
var setValueMethodInfo = typeof(Array).GetMethod("SetValue", new[] { typeof(object), typeof(int) });
using (var il = new GroboIL(dynamicMethod))
{
var buckets = il.DeclareLocal(bucketArrayType, "buckets");
var length = il.DeclareLocal(typeof(int), "length");
var arrayIndex = il.DeclareLocal(typeof(int), "arrayIndex");
var key = il.DeclareLocal(typeof(object), "key");
var cycleStartLabel = il.DefineLabel("cycleStart");
var cycleNextLabel = il.DefineLabel("cycleNext");
var endLabel = il.DefineLabel("end");
il.EmitSetIntToZero(arrayIndex);
il.Ldarg(0); // stack: hashtable
il.Ldfld(bucketsFieldInfo); // stack: hashtable::buckets
il.Stloc(buckets);
il.Ldloc(buckets); // stack: hashtable::buckets
il.Ldlen(); // stack: buckets.length
il.Conv <int>(); // stack: buckets.length (i4)
il.Stloc(length);
il.Br(cycleNextLabel); // jump(cycleNext)
il.MarkLabel(cycleStartLabel);
il.EmitLoadArrayItemRef(buckets, length, bucketType); // stack: *bucket[current]
il.Ldfld(keyFieldInfo); // stack: key
il.Stloc(key); // 2: key
il.Ldloc(key); // stack: key
il.Brfalse(cycleNextLabel); // jump(cycleNext) if key == null
il.Ldloc(key); // stack: key
il.Ldarg(0); // stack+: hashtable
il.Ldfld(bucketsFieldInfo); // stack: key, hashtable::buckets
il.Beq(cycleNextLabel);
// jump(cycleNext) if key == hashtable::buckets (какой-то хитрый хак hashtable-а)
il.Ldloc(arrayIndex); // stack: arrayIndex
il.Ldarg(2); // stack+: arrayLength
il.Bge(endLabel, false); // jump(end) if arrayIndex >= arrayLength
il.Ldarg(1); // stack: array (arg1)
il.EmitLoadArrayItemRef(buckets, length, bucketType); // stack: array (arg1), *bucket[current]
il.Ldfld(valFieldInfo); // stack: array (arg1), bucket[current].val
il.EmitXPlusPlus(arrayIndex); // stack: array (arg1), bucket[current].val, arrayIndex++
il.Call(setValueMethodInfo); // array.SetValue(bucket[current].val, old_arrayIndex);
il.MarkLabel(cycleNextLabel);
il.EmitMinusMinusX(length); // stack: --current
il.Ldc_I4(0); // stack+: 0
il.Bge(cycleStartLabel, false); // jump(cycleStart) if --current >= 0
il.MarkLabel(endLabel);
il.Ret();
}
return((Action <Hashtable, Array, int>)dynamicMethod.CreateDelegate(typeof(Action <Hashtable, Array, int>)));
}
private Type BuildReaderInvoker()
{
var argument = Type.GetGenericArguments()[0];
var typeBuilder = module.DefineType("ReaderInvoker_" + Type, TypeAttributes.Public | TypeAttributes.Class);
var reader = typeBuilder.DefineField("reader", typeof(IntPtr), FieldAttributes.Private);
var serializerId = typeBuilder.DefineField("serializerId", typeof(long), FieldAttributes.Private);
var constructor = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.HasThis, new[] { typeof(IntPtr), typeof(long) });
using (var il = new GroboIL(constructor))
{
il.Ldarg(0); // stack: [this]
il.Ldarg(1); // stack: [this, reader]
il.Stfld(reader); // this.reader = reader; stack: []
il.Ldarg(0); // stack: [this]
il.Ldarg(2); // stack: [this, serializerId]
il.Stfld(serializerId); // this.serializerId = serializerId; stack: []
il.Ret();
}
var method = typeBuilder.DefineMethod("Read", MethodAttributes.Public, argument, new[] { typeof(byte[]) });
using (var il = new GroboIL(method))
{
var pinnedData = il.DeclareLocal(typeof(byte).MakeByRefType(), "pinnedData", true);
il.Ldarg(1); // stack: [data]
il.Ldc_I4(0); // stack: [data, 0]
il.Ldelema(typeof(byte)); // stack: [&data[0]]
il.Stloc(pinnedData); // pinnedData = &data[0]; stack: []
var index = il.DeclareLocal(typeof(int), "index");
il.Ldc_I4(0); // stack: [0]
il.Stloc(index); // index = 0; stack: []
var context = il.DeclareLocal(typeof(ReaderContext), "context");
il.Ldarg(0); // stack: [this]
il.Ldfld(serializerId); // stack: [this.serializerId]
il.Ldarg(1); // stack: [this.serializerId, data]
il.Ldlen(); // stack: [this.serializerId, data.Length]
il.Ldc_I4(0); // stack: [this.serializerId, data.Length, 0]
il.Ldc_I4(0); // stack: [this.serializerId, data.Length, 0, 0]
il.Newobj(typeof(ReaderContext).GetConstructor(new[] { typeof(long), typeof(int), typeof(int), typeof(int) })); // stack: [new ReaderContext(this.serializerId, data.Length, 0, 0)]
il.Stloc(context); // context = new ReaderContext(..); stack: []
var result = il.DeclareLocal(argument, "result");
il.Ldloc(pinnedData); // stack: [data]
il.Conv <IntPtr>(); // stack: [(IntPtr)data]
il.Ldloca(index); // stack: [(IntPtr)data, ref index]
il.Ldloca(result); // stack: [(IntPtr)data, ref index, ref result]
il.Ldloc(context); // stack: [(IntPtr)data, ref index, ref result, context]
il.Ldarg(0); // stack: [(IntPtr)data, ref index, ref result, context, this]
il.Ldfld(reader); // stack: [(IntPtr)data, ref index, ref result, context, this.reader]
var parameterTypes = new[] { typeof(IntPtr), typeof(int).MakeByRefType(), argument.MakeByRefType(), typeof(ReaderContext) };
il.Calli(CallingConventions.Standard, typeof(void), parameterTypes); // this.reader((IntPtr)data, ref index, ref result, context); stack: []
il.FreePinnedLocal(pinnedData); // pinnedData = null; stack: []
var retLabel = il.DefineLabel("ret");
il.Ldarg(1); // stack: [data]
il.Ldlen(); // stack: [data.Length]
il.Ldloc(index); // stack: [data.Length, index]
il.Beq(retLabel); // if(data.Length == index) goto ret; stack: []
il.Ldstr("Encountered extra data");
il.Newobj(typeof(DataCorruptedException).GetConstructor(new[] { typeof(string) }));
il.Throw();
il.MarkLabel(retLabel);
il.Ldloc(result);
il.Ret();
}
return(typeBuilder.CreateType());
}
public void BuildWriter(WriterTypeBuilderContext writerTypeBuilderContext)
{
var method = new DynamicMethod("Write_" + Type.Name + "_" + Guid.NewGuid(), typeof(void),
new[]
{
Type, typeof(bool), typeof(IntPtr), typeof(int).MakeByRefType(), typeof(WriterContext)
}, writerTypeBuilderContext.Module, true);
writerTypeBuilderContext.SetWriterMethod(Type, method);
using (var il = new GroboIL(method))
{
var context = new WriterMethodBuilderContext(writerTypeBuilderContext, il);
var notEmptyLabel = il.DefineLabel("notEmpty");
if (CheckEmpty(context, notEmptyLabel)) // Check if obj is empty
{
context.WriteNull(); // Write null & return
}
il.MarkLabel(notEmptyLabel); // Now we know that obj is not empty
if (!Type.IsValueType && IsReference && writerTypeBuilderContext.GroBufWriter.Options.HasFlag(GroBufOptions.PackReferences))
{
// Pack reference
var index = il.DeclareLocal(typeof(int));
context.LoadIndex(); // stack: [external index]
context.LoadContext(); // stack: [external index, context]
il.Ldfld(WriterContext.StartField); // stack: [external index, context.start]
il.Sub(); // stack: [external index - context.start]
il.Stloc(index); // index = external index - context.start; stack: []
context.LoadContext(); // stack: [context]
il.Ldfld(typeof(WriterContext).GetField("objects", BindingFlags.Public | BindingFlags.Instance)); // stack: [context.objects]
context.LoadObj(); // stack: [context.objects, obj]
var reference = il.DeclareLocal(typeof(int));
il.Ldloca(reference); // stack: [context.objects, obj, ref reference]
int dummy;
il.Call(HackHelpers.GetMethodDefinition <Dictionary <object, int> >(dict => dict.TryGetValue(null, out dummy))); // stack: [context.object.TryGetValue(obj, out reference)]
var storeLocationLabel = il.DefineLabel("storeLocation");
il.Brfalse(storeLocationLabel);
// Current object is in dict
il.Ldloc(index);
il.Ldloc(reference); // stack: [index, reference]
var skipSelfLabel = il.DefineLabel("skipSelf");
il.Beq(skipSelfLabel); // if(index == reference) goto skipSelf; stack: []
il.Ldloc(index); // stack: [index]
il.Ldloc(reference); // stack: [index, reference]
var badReferenceLabel = il.DefineLabel("badReference");
il.Blt(badReferenceLabel, false); // if(index < reference) goto badReference; stack: []
context.WriteTypeCode(GroBufTypeCode.Reference); // result[index++] = GroBufTypeCode.Reference
context.GoToCurrentLocation(); // stack: [&result[index]]
il.Ldloc(reference); // stack: [&result[index], reference]
il.Stind(typeof(int)); // *(int *)&result[index] = reference
context.IncreaseIndexBy4(); // index += 4
il.Ret();
il.MarkLabel(badReferenceLabel);
il.Ldstr("Bad reference");
il.Newobj(typeof(DataCorruptedException).GetConstructor(new[] { typeof(string) }));
il.Throw();
il.MarkLabel(storeLocationLabel);
context.LoadContext(); // stack: [context]
il.Ldfld(typeof(WriterContext).GetField("objects", BindingFlags.Public | BindingFlags.Instance)); // stack: [context.objects]
context.LoadObj(); // stack: [context.objects, obj]
il.Ldloc(index); // stack: [context.objects, obj, index]
il.Call(HackHelpers.GetMethodDefinition <Dictionary <object, int> >(dict => dict.Add(null, 0))); // context.objects.Add(obj, index);
il.MarkLabel(skipSelfLabel);
}
WriteNotEmpty(context); // Write obj
il.Ret();
}
var @delegate = method.CreateDelegate(typeof(WriterDelegate <>).MakeGenericType(Type));
var pointer = GroBufHelpers.ExtractDynamicMethodPointer(method);
writerTypeBuilderContext.SetWriterPointer(Type, pointer, @delegate);
}