private static MethodInfo CreateStandardDictionaryGenerator(TypeBuilder standardDictionaryGeneratorStubTypeBuilder, ushort capacity)
{
Assumes.NotNull(standardDictionaryGeneratorStubTypeBuilder);
// static internal CreateStandardDictionaryGenerator(string key0, object value0, ... string keyN-1, object valyeN-1)
Type[] argumentTypes = new Type[capacity * 2];
for (ushort i = 0; i < capacity; i++)
{
argumentTypes[i * 2] = GenerationServices.StringType;
argumentTypes[i * 2 + 1] = GenerationServices.ObjectType;
}
MethodBuilder standardDictionaryGeneratorBuilder = standardDictionaryGeneratorStubTypeBuilder.DefineMethod(
capacity.ToString(CultureInfo.InvariantCulture),
MethodAttributes.Static | MethodAttributes.Assembly,
GenerationServices.standardDictionaryType,
argumentTypes);
ILGenerator ilGenerator = standardDictionaryGeneratorBuilder.GetILGenerator();
//
// Dictionary<string, object> metadata = new Dictionary<string, TValue>(capacity)
//
// create and load the dictionary
GenerationServices.LoadInt(ilGenerator, capacity);
ilGenerator.Emit(OpCodes.Newobj, GenerationServices.standardDictionaryConstructor);
//
// dictionary.Add(key0, value0)
// dictionary.Add(key1, value1)
// ...
//
for (ushort i = 0; i < capacity; i++)
{
// the dictionary is on top of the stack - load it again
ilGenerator.Emit(OpCodes.Dup);
// load the key
ilGenerator.Emit(OpCodes.Ldarg, i * 2);
// load the value
ilGenerator.Emit(OpCodes.Ldarg, i * 2 + 1);
// Caal the "Add"
ilGenerator.EmitCall(OpCodes.Call, GenerationServices.standardDictionaryAddMethod, null);
}
ilGenerator.Emit(OpCodes.Ret);
return standardDictionaryGeneratorBuilder;
}
private CachingResult LoadEnumerable(ILGenerator ilGenerator, IEnumerable enumerable)
{
Assumes.NotNull(ilGenerator);
Assumes.NotNull(enumerable);
CachingResult result = CachingResult.SucceededResult;
// We load enumerable as an array - this is the most compact and efficient way of representing it
Type elementType = null;
Type closedType = null;
if (GenerationServices.TryGetGenericInterfaceType(enumerable.GetType(), GenerationServices.IEnumerableTypeofT, out closedType))
{
elementType = closedType.GetGenericArguments()[0];
}
else
{
elementType = typeof(object);
}
elementType = GenerationServices.NormalizeCollectionElementType(elementType);
//
// elem[] array = new elem[<enumerable.Count()>]
//
GenerationServices.LoadInt(ilGenerator, enumerable.Cast<object>().Count());
ilGenerator.Emit(OpCodes.Newarr, elementType);
// at this point we have the array on the stack
int index = 0;
foreach (object value in enumerable)
{
//
//array[<index>] = value;
//
// load the array on teh stack again
ilGenerator.Emit(OpCodes.Dup);
GenerationServices.LoadInt(ilGenerator, index);
result = result.MergeResult(this.LoadValue(ilGenerator, value));
if (GenerationServices.IsBoxingRequiredForValue(value) && !elementType.IsValueType)
{
ilGenerator.Emit(OpCodes.Box, value.GetType());
}
ilGenerator.Emit(OpCodes.Stelem, elementType);
index++;
// at this point we have the array on teh stack again
}
// the array is already on the stack - just exit
return result;
}
/// Generates the code that loads the supplied value on the stack
/// This is not as simple as it seems, as different instructions need to be generated depending
/// on its type.
/// We support:
/// 1. All primitive types and IntPtrs
/// 2. Strings
/// 3. Enums
/// 4. typeofs
/// 5. nulls
/// 6. Dictionaries of (string, object) recursively containing all of the above
/// 7. Enumerables
/// Everything else cannot be represented as literals
/// <param name="ilGenerator"></param>
/// <param name="item"></param>
/// <param name="key"></param>
/// <param name="value"></param>
/// <returns></returns>
internal CachingResult LoadValue(ILGenerator ilGenerator, object value)
{
Assumes.NotNull(ilGenerator);
CachingResult result = CachingResult.SucceededResult;
//
// Get nulls out of the way - they are basically typeless, so we just load null
//
if (value == null)
{
return GenerationServices.LoadNull(ilGenerator);
}
//
// Prepare for literal loading - decide whether we should box, and handle enums properly
//
Type valueType = value.GetType();
object rawValue = value;
if (valueType.IsEnum)
{
// enums are special - we need to load the underlying constant on the stack
rawValue = Convert.ChangeType(value, Enum.GetUnderlyingType(valueType), null);
valueType = rawValue.GetType();
}
//
// Generate IL depending on the valueType - this is messier than it should ever be, but sadly necessary
//
Type dictionaryKeyType;
Type dictionaryValueType;
IDictionary<string, object> standardDictionary = value as IDictionary<string, object>;
if (standardDictionary != null)
{
if (standardDictionary.Count < GenerationServices.StandardDictionaryGeneratorsCount)
{
return this.LoadStandardDictionaryFast(ilGenerator, standardDictionary);
}
else
{
return this.LoadGenericDictionary(ilGenerator, standardDictionary, true);
}
}
else if (GenerationServices.TryGetDictionaryElementType(valueType, out dictionaryKeyType, out dictionaryValueType))
{
result = result.MergeResult(this.LoadDictionary(ilGenerator, rawValue, dictionaryKeyType, dictionaryValueType));
}
else if (valueType == GenerationServices.StringType)
{
// we need to check for strings before enumerables, because strings are IEnumerable<char>
result = result.MergeResult(GenerationServices.LoadString(ilGenerator,(string)rawValue));
}
else if (GenerationServices.TypeType.IsAssignableFrom(valueType))
{
result = result.MergeResult(GenerationServices.LoadTypeOf(ilGenerator, (Type)rawValue));
}
else if (GenerationServices.IEnumerableType.IsAssignableFrom(valueType))
{
// NOTE : strings and dictionaries are also enumerables, but we have already handled those
result = result.MergeResult(this.LoadEnumerable(ilGenerator, (IEnumerable) rawValue));
}
else if (
(valueType == GenerationServices.CharType) ||
(valueType == GenerationServices.BooleanType) ||
(valueType == GenerationServices.ByteType) ||
(valueType == GenerationServices.SByteType) ||
(valueType == GenerationServices.Int16Type) ||
(valueType == GenerationServices.UInt16Type) ||
(valueType == GenerationServices.Int32Type)
)
{
// NOTE : Everything that is 32 bit or less uses ldc.i4. We need to pass int32, even if the actual types is shorter - this is IL memory model
// direct casting to (int) won't work, because the value is boxed, thus we need to use Convert.
// Sadly, this will not work for all cases - namely large uint32 - because they can't semantically fit into 32 signed bits
// We have a special case for that next
result = result.MergeResult(GenerationServices.LoadInt(ilGenerator, (int)Convert.ChangeType(rawValue, typeof(int), CultureInfo.InvariantCulture)));
}
else if (valueType == GenerationServices.UInt32Type)
{
// NOTE : This one is a bit tricky. Ldc.I4 takes an Int32 as an argument, although it really treats it as a 32bit number
// That said, some UInt32 values are larger that Int32.MaxValue, so the Convert call above will fail, which is why
// we need to treat this case individually and cast to uint, and then - unchecked - to int.
result = result.MergeResult(GenerationServices.LoadInt(ilGenerator, unchecked((int)((uint)rawValue))));
}
else if (valueType == GenerationServices.Int64Type)
{
result = result.MergeResult(GenerationServices.LoadLong(ilGenerator, (long)rawValue));
}
else if (valueType == GenerationServices.UInt64Type)
{
// NOTE : This one is a bit tricky. Ldc.I8 takes an Int64 as an argument, although it really treats it as a 64bit number
// That said, some UInt64 values are larger that Int64.MaxValue, so the direct case we use above (or Convert, for that matter)will fail, which is why
// we need to treat this case individually and cast to ulong, and then - unchecked - to long.
result = result.MergeResult(GenerationServices.LoadLong(ilGenerator, unchecked((long)((ulong)rawValue))));
}
else if (valueType == GenerationServices.SingleType)
{
result = result.MergeResult(GenerationServices.LoadFloat(ilGenerator, (float)rawValue));
}
else if (valueType == GenerationServices.DoubleType)
{
result = result.MergeResult(GenerationServices.LoadDouble(ilGenerator, (double)rawValue));
}
else
{
result = result.MergeError(Strings.UnsupportedCacheValue, value.GetType().FullName);
// Make sure the IL is balanced - generate the ldnull instead
GenerationServices.LoadNull(ilGenerator);
}
return result;
}
private CachingResult LoadGenericDictionary<TKey, TValue>(ILGenerator ilGenerator, IDictionary<TKey, TValue> dictionary, bool isStandardDictionary)
{
Assumes.NotNull(ilGenerator);
Assumes.NotNull(dictionary);
CachingResult result = CachingResult.SucceededResult;
Type keyType = GenerationServices.NormalizeCollectionElementType(typeof(TKey));
Type valueType = GenerationServices.NormalizeCollectionElementType(typeof(TValue));
Type dictionaryType = null;
MethodInfo dictionaryAddMethod = null;
ConstructorInfo dictionaryConstructor = null;
if (isStandardDictionary)
{
dictionaryType = GenerationServices.standardDictionaryType;
dictionaryAddMethod = GenerationServices.standardDictionaryAddMethod;
dictionaryConstructor = dictionaryType.GetConstructor(new Type[] { Int32Type });
}
else
{
dictionaryType = GenerationServices.GenericDictionaryType.MakeGenericType(keyType, valueType);
dictionaryAddMethod = dictionaryType.GetMethod("Add", new Type[] { keyType, valueType });
dictionaryConstructor = dictionaryType.GetConstructor(new Type[] { Int32Type });
}
//
// Dictionary<TKey, TValue> metadata = new Dictionary<TKey, TValue>(capacity)
//
// create and load the dictionary
GenerationServices.LoadInt(ilGenerator, dictionary.Count);
ilGenerator.Emit(OpCodes.Newobj, dictionaryConstructor);
//
// Generate a sequence of "Add" statements
//
foreach (KeyValuePair<TKey, TValue> dictionaryItem in dictionary)
{
//
// metadata.Add(key, value)
//
// the dictionary is on top of the stack - load it again
ilGenerator.Emit(OpCodes.Dup);
// load the key, boxing if necessary
result = result.MergeResult(this.LoadValue(ilGenerator, dictionaryItem.Key));
// key = string for standard dictionaries, so no boxing is ever required
if (!isStandardDictionary && GenerationServices.IsBoxingRequiredForValue(dictionaryItem.Key) && !keyType.IsValueType)
{
ilGenerator.Emit(OpCodes.Box, dictionaryItem.Key.GetType());
}
// load the value, boxing if necessary
result = result.MergeResult(this.LoadValue(ilGenerator, dictionaryItem.Value));
// key = object for standard dictionaries, so value type is never a struct
if (GenerationServices.IsBoxingRequiredForValue(dictionaryItem.Value) && (isStandardDictionary || !valueType.IsValueType) )
{
ilGenerator.Emit(OpCodes.Box, dictionaryItem.Value.GetType());
}
// Caal the "Add"
ilGenerator.EmitCall(OpCodes.Call, dictionaryAddMethod, null);
// At this point the dictionary, key and value have been popped off the stack, and we ended up with the origical state of the dictionary on top of the stack
}
//
// the dicationary is already loaded on the stack - exit
//
return result;
}
