public Function(Type declaringType, MethodReference methodReference, TypeRef functionType, ValueRef generatedValue, FunctionSignature signature)
{
Signature = signature;
DeclaringType = declaringType;
MethodReference = methodReference;
FunctionType = functionType;
GeneratedValue = generatedValue;
VirtualSlot = -1;
MethodDefinition = methodReference.Resolve();
ParameterTypes = signature.ParameterTypes.Select(x => x.Type).ToArray();
// Generate function type when being called from vtable/IMT (if it applies)
// If declaring type is a value type, needs to unbox "this" for virtual method
if (DeclaringType.TypeDefinitionCecil.IsValueType
&& (MethodDefinition.Attributes & MethodAttributes.Virtual) != 0)
{
bool hasStructValueReturn = signature.ReturnType.ABIParameterInfo.Kind == ABIParameterInfoKind.Indirect;
// Create function type with boxed "this"
var argumentCount = LLVM.CountParamTypes(FunctionType);
var argumentTypes = new TypeRef[argumentCount];
LLVM.GetParamTypes(FunctionType, argumentTypes);
// Change first type to boxed "this"
var thisIndex = hasStructValueReturn ? 1 : 0;
argumentTypes[thisIndex] = LLVM.PointerType(DeclaringType.ObjectTypeLLVM, 0);
VirtualFunctionType = LLVM.FunctionType(LLVM.GetReturnType(FunctionType), argumentTypes, LLVM.IsFunctionVarArg(FunctionType));
}
else
{
VirtualFunctionType = FunctionType;
}
}
public Type(TypeReference typeReference, TypeDefinition typeDefinition, TypeRef dataType, TypeRef valueType, TypeRef objectType, StackValueType stackType)
{
TypeReferenceCecil = typeReference;
TypeDefinitionCecil = typeDefinition;
DataTypeLLVM = dataType;
ObjectTypeLLVM = objectType;
StackType = stackType;
ValueTypeLLVM = valueType;
DefaultTypeLLVM = stackType == StackValueType.Object ? LLVM.PointerType(ObjectTypeLLVM, 0) : DataTypeLLVM;
switch (stackType)
{
case StackValueType.NativeInt:
TypeOnStackLLVM = LLVM.PointerType(LLVM.Int8TypeInContext(LLVM.GetTypeContext(dataType)), 0);
break;
case StackValueType.Float:
TypeOnStackLLVM = LLVM.DoubleTypeInContext(LLVM.GetTypeContext(dataType));
break;
case StackValueType.Int32:
TypeOnStackLLVM = LLVM.Int32TypeInContext(LLVM.GetTypeContext(dataType));
break;
case StackValueType.Int64:
TypeOnStackLLVM = LLVM.Int64TypeInContext(LLVM.GetTypeContext(dataType));
break;
case StackValueType.Value:
case StackValueType.Object:
case StackValueType.Reference:
TypeOnStackLLVM = DefaultTypeLLVM;
break;
}
}
public Type(TypeReference typeReference, TypeRef dataType, TypeRef objectType, StackValueType stackType)
{
TypeReference = typeReference;
DataType = dataType;
ObjectType = objectType;
StackType = stackType;
DefaultType = stackType == StackValueType.Object ? LLVM.PointerType(ObjectType, 0) : DataType;
StackType = stackType;
switch (stackType)
{
case StackValueType.NativeInt:
TypeOnStack = LLVM.PointerType(LLVM.Int8TypeInContext(LLVM.GetTypeContext(dataType)), 0);
break;
case StackValueType.Float:
TypeOnStack = LLVM.DoubleTypeInContext(LLVM.GetTypeContext(dataType));
break;
case StackValueType.Int32:
TypeOnStack = LLVM.Int32TypeInContext(LLVM.GetTypeContext(dataType));
break;
case StackValueType.Int64:
TypeOnStack = LLVM.Int64TypeInContext(LLVM.GetTypeContext(dataType));
break;
case StackValueType.Value:
case StackValueType.Object:
case StackValueType.Reference:
TypeOnStack = DefaultType;
break;
}
}
public ABIParameterInfo(ABIParameterInfoKind kind, TypeRef coerceType)
{
if (kind != ABIParameterInfoKind.Coerced)
throw new ArgumentException("kind");
Kind = kind;
CoerceType = coerceType;
}
public Function(Type declaringType, MethodReference methodReference, TypeRef functionType, ValueRef generatedValue, Type returnType, Type[] parameterTypes)
{
Signature = new FunctionSignature(returnType, parameterTypes);
DeclaringType = declaringType;
MethodReference = methodReference;
FunctionType = functionType;
GeneratedValue = generatedValue;
VirtualSlot = -1;
}
private FunctionSignature CreateFunctionSignature(MethodReference context, CallSite callSite)
{
var numParams = callSite.Parameters.Count;
if (callSite.HasThis)
numParams++;
var parameterTypes = new Type[numParams];
var parameterTypesLLVM = new TypeRef[numParams];
for (int index = 0; index < numParams; index++)
{
TypeReference parameterTypeReference;
var parameter = callSite.Parameters[index];
parameterTypeReference = ResolveGenericsVisitor.Process(context, parameter.ParameterType);
var parameterType = CreateType(parameterTypeReference);
if (parameterType.DefaultType.Value == IntPtr.Zero)
throw new InvalidOperationException();
parameterTypes[index] = parameterType;
parameterTypesLLVM[index] = parameterType.DefaultType;
}
var returnType = CreateType(ResolveGenericsVisitor.Process(context, context.ReturnType));
return new FunctionSignature(returnType, parameterTypes);
}
/// <summary>
/// Creates the function.
/// </summary>
/// <param name="method">The method.</param>
/// <returns></returns>
Function CreateFunction(MethodReference method)
{
Function function;
if (functions.TryGetValue(method, out function))
return function;
var numParams = method.Parameters.Count;
if (method.HasThis)
numParams++;
var parameterTypes = new Type[numParams];
var parameterTypesLLVM = new TypeRef[numParams];
var declaringType = CreateType(ResolveGenericsVisitor.Process(method, method.DeclaringType));
for (int index = 0; index < numParams; index++)
{
TypeReference parameterTypeReference;
if (method.HasThis && index == 0)
{
parameterTypeReference = declaringType.TypeReference;
// Value type uses ByReference type for this
if (parameterTypeReference.IsValueType)
parameterTypeReference = parameterTypeReference.MakeByReferenceType();
}
else
{
var parameter = method.Parameters[method.HasThis ? index - 1 : index];
parameterTypeReference = ResolveGenericsVisitor.Process(method, parameter.ParameterType);
}
var parameterType = CreateType(parameterTypeReference);
if (parameterType.DefaultType.Value == IntPtr.Zero)
throw new InvalidOperationException();
parameterTypes[index] = parameterType;
parameterTypesLLVM[index] = parameterType.DefaultType;
}
var returnType = CreateType(ResolveGenericsVisitor.Process(method, method.ReturnType));
// Generate function global
bool isExternal = method.DeclaringType.Resolve().Module.Assembly != assembly;
var methodMangledName = Regex.Replace(method.FullName, @"(\W)", "_");
var functionType = LLVM.FunctionType(returnType.DefaultType, parameterTypesLLVM, false);
var resolvedMethod = method.Resolve();
var hasDefinition = resolvedMethod != null
&& (resolvedMethod.HasBody
|| ((resolvedMethod.ImplAttributes & (MethodImplAttributes.InternalCall | MethodImplAttributes.Runtime)) != 0));
var functionGlobal = hasDefinition
? LLVM.AddFunction(module, methodMangledName, functionType)
: LLVM.ConstPointerNull(LLVM.PointerType(functionType, 0));
function = new Function(declaringType, method, functionType, functionGlobal, returnType, parameterTypes);
functions.Add(method, function);
if (hasDefinition)
{
if (isExternal)
{
// External weak linkage
LLVM.SetLinkage(functionGlobal, Linkage.ExternalWeakLinkage);
}
else
{
// Need to compile
EmitFunction(function);
}
}
return function;
}
public void InitializeCommonTypes()
{
// Load runtime
runtimeModule = LoadModule(context, LocateRuntimeModule(triple));
// Load data layout from runtime
var dataLayout = LLVM.GetDataLayout(runtimeModule);
targetData = LLVM.CreateTargetData(dataLayout);
// Initialize LLVM types
intPtrLLVM = LLVM.PointerType(LLVM.Int8TypeInContext(context), 0);
int32LLVM = LLVM.Int32TypeInContext(context);
int64LLVM = LLVM.Int64TypeInContext(context);
intPtrSize = (int)LLVM.ABISizeOfType(targetData, intPtrLLVM);
nativeIntLLVM = LLVM.IntTypeInContext(context, (uint)intPtrSize * 8);
// Prepare system types, for easier access
intPtr = GetType(corlib.MainModule.GetType(typeof(IntPtr).FullName), TypeState.StackComplete);
int8 = GetType(corlib.MainModule.GetType(typeof(sbyte).FullName), TypeState.StackComplete);
int16 = GetType(corlib.MainModule.GetType(typeof(short).FullName), TypeState.StackComplete);
int32 = GetType(corlib.MainModule.GetType(typeof(int).FullName), TypeState.StackComplete);
int64 = GetType(corlib.MainModule.GetType(typeof(long).FullName), TypeState.StackComplete);
uint8 = GetType(corlib.MainModule.GetType(typeof(byte).FullName), TypeState.StackComplete);
uint16 = GetType(corlib.MainModule.GetType(typeof(ushort).FullName), TypeState.StackComplete);
uint32 = GetType(corlib.MainModule.GetType(typeof(uint).FullName), TypeState.StackComplete);
uint64 = GetType(corlib.MainModule.GetType(typeof(ulong).FullName), TypeState.StackComplete);
@bool = GetType(corlib.MainModule.GetType(typeof(bool).FullName), TypeState.StackComplete);
@float = GetType(corlib.MainModule.GetType(typeof(float).FullName), TypeState.StackComplete);
@double = GetType(corlib.MainModule.GetType(typeof(double).FullName), TypeState.StackComplete);
@char = GetType(corlib.MainModule.GetType(typeof(char).FullName), TypeState.StackComplete);
@object = GetType(corlib.MainModule.GetType(typeof(object).FullName), TypeState.StackComplete);
@void = GetType(corlib.MainModule.GetType(typeof(void).FullName), TypeState.StackComplete);
// struct IMTEntry { i8* interfaceFunctionPtr, i8* functionPtr }
imtEntryLLVM = LLVM.StructCreateNamed(context, "IMTEntry");
LLVM.StructSetBody(imtEntryLLVM, new[] { intPtrLLVM, intPtrLLVM }, false);
// struct CaughtResultType { i8*, i32 }
caughtResultLLVM = LLVM.StructCreateNamed(context, "CaughtResultType");
LLVM.StructSetBody(caughtResultLLVM, new[] { intPtrLLVM, int32LLVM }, false);
// Prepare types used to emit metadata and reflection
if (!TestMode)
{
sharpLangTypeType = GetType(corlib.MainModule.GetType("System.SharpLangType"), TypeState.StackComplete);
sharpLangModuleType = GetType(corlib.MainModule.GetType("System.SharpLangModule"), TypeState.StackComplete);
}
else
{
sharpLangTypeType = intPtr;
sharpLangModuleType = intPtr;
}
// struct TypeDef { SharpLangModule*, i32 }
typeDefLLVM = LLVM.StructCreateNamed(context, "TypeDef");
LLVM.StructSetBody(typeDefLLVM, new[] { sharpLangModuleType.DefaultTypeLLVM, int32LLVM }, false);
// Import runtime methods
allocObjectFunctionLLVM = ImportRuntimeFunction(module, "allocObject");
resolveInterfaceCallFunctionLLVM = ImportRuntimeFunction(module, "resolveInterfaceCall");
isInstInterfaceFunctionLLVM = ImportRuntimeFunction(module, "isInstInterface");
throwExceptionFunctionLLVM = ImportRuntimeFunction(module, "throwException");
sharpPersonalityFunctionLLVM = ImportRuntimeFunction(module, "sharpPersonality");
pinvokeLoadLibraryFunctionLLVM = ImportRuntimeFunction(module, "PInvokeOpenLibrary");
pinvokeGetProcAddressFunctionLLVM = ImportRuntimeFunction(module, "PInvokeGetProcAddress");
}
private ValueRef ConvertToInt(ValueRef value, TypeRef intTypeLLVM)
{
var valueType = LLVM.TypeOf(value);
// NatveInt: cast to integer
if (LLVM.GetTypeKind(valueType) == TypeKind.PointerTypeKind)
return LLVM.BuildPtrToInt(builder, value, intTypeLLVM, string.Empty);
// Integer of different size: cast
if (valueType != intTypeLLVM)
return LLVM.BuildIntCast(builder, value, intTypeLLVM, string.Empty);
// Otherwise, return as is
return value;
}
private void EmitStaticInvokeCall(ValueRef invokeMethodHelper)
{
// Get Delegate type and _methodPtrAux field
var delegateType = corlib.MainModule.GetType(typeof(Delegate).FullName);
var methodPtrAuxField = delegateType.Fields.First(x => x.Name == "_methodPtrAux");
var invokeFunctionType = LLVM.GetElementType(LLVM.TypeOf(invokeMethodHelper));
// Ignore first arguments
var helperArgs = new ValueRef[LLVM.CountParams(invokeMethodHelper) - 1];
var helperArgTypes = new TypeRef[helperArgs.Length];
for (int i = 0; i < helperArgs.Length; ++i)
{
helperArgs[i] = LLVM.GetParam(invokeMethodHelper, (uint)i + 1);
helperArgTypes[i] = LLVM.TypeOf(helperArgs[i]);
}
var helperFunctionType = LLVM.FunctionType(LLVM.GetReturnType(invokeFunctionType), helperArgTypes, false);
// 1. Load static function pointers (arg0->_methodPtrAux)
var @this = LLVM.GetParam(invokeMethodHelper, 0);
// Compute field address
var instructionFlags = InstructionFlags.None;
var fieldAddress = ComputeFieldAddress(builder2, GetType(delegateType, TypeState.TypeComplete).Fields[methodPtrAuxField], StackValueType.Object, @this, ref instructionFlags);
// Load value from field
var methodPtrAux = LLVM.BuildLoad(builder2, fieldAddress, string.Empty);
methodPtrAux = LLVM.BuildPointerCast(builder2, methodPtrAux, LLVM.PointerType(helperFunctionType, 0), string.Empty);
// 2. Call method
var methodPtrAuxCall = LLVM.BuildCall(builder2, methodPtrAux, helperArgs, string.Empty);
LLVM.SetTailCall(methodPtrAuxCall, true);
// Return value
if (LLVM.GetReturnType(invokeFunctionType) != LLVM.VoidTypeInContext(context))
LLVM.BuildRet(builder2, methodPtrAuxCall);
else
LLVM.BuildRetVoid(builder2);
}
private void BuildRuntimeType(Class @class)
{
if (@class.IsEmitted)
return;
@class.IsEmitted = true;
// Build IMT
var interfaceMethodTable = new LinkedList<InterfaceMethodTableEntry>[InterfaceMethodTableSize];
foreach (var @interface in @class.Interfaces)
{
foreach (var interfaceMethod in @interface.Type.TypeReference.Resolve().Methods)
{
var resolvedInterfaceMethod = ResolveGenericMethod(@interface.Type.TypeReference, interfaceMethod);
// If method is not fully resolved (generic method in interface), ignore it
// We are waiting for actual closed uses.
if (ResolveGenericsVisitor.ContainsGenericParameters(resolvedInterfaceMethod))
continue;
var resolvedFunction = CecilExtensions.TryMatchMethod(@class, resolvedInterfaceMethod);
if (resolvedFunction == null && @class.Type.TypeReference is ArrayType)
{
var arrayType = corlib.MainModule.GetType(typeof(Array).FullName);
var matchingMethod = (MethodReference)arrayType.Methods.First(x => x.Name.StartsWith("InternalArray_") && x.Name.EndsWith(resolvedInterfaceMethod.Name));
if (matchingMethod != null)
{
if (matchingMethod.HasGenericParameters)
{
matchingMethod = matchingMethod.MakeGenericMethod(((ArrayType)@class.Type.TypeReference).ElementType);
}
resolvedFunction = GetFunction(matchingMethod);
// Manually emit Array functions locally (until proper mscorlib + generic instantiation exists).
EmitFunction(resolvedFunction);
}
}
if (resolvedFunction == null)
throw new InvalidOperationException(string.Format("Could not find matching method for {0} in {1}", resolvedInterfaceMethod, @class));
var isInterface = resolvedFunction.DeclaringType.TypeReference.Resolve().IsInterface;
if (!isInterface && resolvedFunction.MethodReference.Resolve().IsVirtual && resolvedFunction.VirtualSlot != -1)
{
// We might have found a base virtual method matching this interface method.
// Let's get the actual method override for this virtual slot.
resolvedFunction = @class.VirtualTable[resolvedFunction.VirtualSlot];
}
// If method is not found, it could be due to covariance/contravariance
if (resolvedFunction == null)
throw new InvalidOperationException("Interface method not found");
var methodId = GetMethodId(resolvedInterfaceMethod);
var imtSlotIndex = (int) (methodId%interfaceMethodTable.Length);
var imtSlot = interfaceMethodTable[imtSlotIndex];
if (imtSlot == null)
interfaceMethodTable[imtSlotIndex] = imtSlot = new LinkedList<InterfaceMethodTableEntry>();
imtSlot.AddLast(new InterfaceMethodTableEntry
{
Function = resolvedFunction,
MethodId = methodId,
SlotIndex = imtSlotIndex
});
}
}
var interfaceMethodTableConstant = LLVM.ConstArray(intPtrType, interfaceMethodTable.Select(imtSlot =>
{
if (imtSlot == null)
{
// No entries: null slot
return LLVM.ConstNull(intPtrType);
}
if (imtSlot.Count == 1)
{
// Single entry
var imtEntry = imtSlot.First.Value;
return LLVM.ConstPointerCast(imtEntry.Function.GeneratedValue, intPtrType);
}
else
{
// Multiple entries, create IMT array with all entries
// TODO: Support covariance/contravariance?
var imtEntries = LLVM.ConstArray(imtEntryType, imtSlot.Select(imtEntry =>
{
return LLVM.ConstNamedStruct(imtEntryType, new[]
{
LLVM.ConstInt(int32Type, (ulong) imtEntry.MethodId, false), // i32 functionId
LLVM.ConstPointerCast(imtEntry.Function.GeneratedValue, intPtrType), // i8* functionPtr
});
})
.Concat(Enumerable.Repeat(LLVM.ConstNull(imtEntryType), 1)).ToArray()); // Append { 0, 0 } terminator
var imtEntryGlobal = LLVM.AddGlobal(module, LLVM.TypeOf(imtEntries), @class.Type.TypeReference.MangledName() + ".imt");
LLVM.SetInitializer(imtEntryGlobal, imtEntries);
// Add 1 to differentiate between single entry and IMT array
return LLVM.ConstIntToPtr(
LLVM.ConstAdd(
LLVM.ConstPtrToInt(imtEntryGlobal, nativeIntType),
LLVM.ConstInt(nativeIntType, 1, false)),
intPtrType);
}
}).ToArray());
// Build list of super types
var superTypes = new List<Class>(@class.Depth);
var currentClass = @class;
while (currentClass != null)
{
superTypes.Add(currentClass);
currentClass = currentClass.BaseType;
}
// Reverse so that the list start with most inherited object
// (allows faster type checking since a given type will always be at a given index)
superTypes.Reverse();
// Build super types
// Helpful for fast is/as checks on class hierarchy
var superTypeCount = LLVM.ConstInt(int32Type, (ulong) @class.Depth + 1, false);
var interfacesCount = LLVM.ConstInt(int32Type, (ulong) @class.Interfaces.Count, false);
var zero = LLVM.ConstInt(int32Type, 0, false);
// Super types global
var superTypesConstantGlobal = LLVM.AddGlobal(module, LLVM.ArrayType(intPtrType, (uint) superTypes.Count),
@class.Type.TypeReference.MangledName() + ".supertypes");
var superTypesGlobal = LLVM.ConstInBoundsGEP(superTypesConstantGlobal, new[] {zero, zero});
// Interface map global
var interfacesConstantGlobal = LLVM.AddGlobal(module, LLVM.ArrayType(intPtrType, (uint) @class.Interfaces.Count),
@class.Type.TypeReference.MangledName() + ".interfaces");
var interfacesGlobal = LLVM.ConstInBoundsGEP(interfacesConstantGlobal, new[] {zero, zero});
// Build VTable
var vtableConstant = LLVM.ConstStructInContext(context, @class.VirtualTable.Select(x => x.GeneratedValue).ToArray(), false);
// Build RTTI
var runtimeTypeInfoGlobal = @class.GeneratedRuntimeTypeInfoGlobal;
var runtimeTypeInfoType = LLVM.GetElementType(LLVM.TypeOf(runtimeTypeInfoGlobal));
var runtimeTypeInfoTypeElements = new TypeRef[LLVM.CountStructElementTypes(runtimeTypeInfoType)];
LLVM.GetStructElementTypes(runtimeTypeInfoType, runtimeTypeInfoTypeElements);
var runtimeTypeInfoConstant = LLVM.ConstNamedStruct(runtimeTypeInfoType, new[]
{
@class.BaseType != null ? @class.BaseType.GeneratedRuntimeTypeInfoGlobal : LLVM.ConstPointerNull(intPtrType),
superTypeCount,
interfacesCount,
superTypesGlobal,
interfacesGlobal,
LLVM.ConstInt(LLVM.Int1TypeInContext(context), 0, false), // Class initialized?
interfaceMethodTableConstant,
vtableConstant,
LLVM.ConstNull(runtimeTypeInfoTypeElements[(int)RuntimeTypeInfoFields.StaticFields]),
});
LLVM.SetInitializer(runtimeTypeInfoGlobal, runtimeTypeInfoConstant);
// Build super type list (after RTTI since we need pointer to RTTI)
var superTypesConstant = LLVM.ConstArray(intPtrType,
superTypes.Select(superType => LLVM.ConstPointerCast(superType.GeneratedRuntimeTypeInfoGlobal, intPtrType))
.ToArray());
LLVM.SetInitializer(superTypesConstantGlobal, superTypesConstant);
// Build interface map
var interfacesConstant = LLVM.ConstArray(intPtrType,
@class.Interfaces.Select(
@interface => LLVM.ConstPointerCast(@interface.GeneratedRuntimeTypeInfoGlobal, intPtrType)).ToArray());
LLVM.SetInitializer(interfacesConstantGlobal, interfacesConstant);
// Mark RTTI as external
LLVM.SetLinkage(runtimeTypeInfoGlobal, Linkage.ExternalLinkage);
}
private TypeRef CreateFunctionTypeLLVM(FunctionSignature functionSignature)
{
// Some extra arguments might be preprended:
// - Return value pointer if struct returned by value
// - "this" if a class
bool hasStructValueReturn = functionSignature.ReturnType.ABIParameterInfo.Kind == ABIParameterInfoKind.Indirect;
var numParams = functionSignature.ParameterTypes.Length;
var firstArgumentIndex = 0;
if (hasStructValueReturn)
firstArgumentIndex++;
var parameterTypesLLVM = new TypeRef[numParams + (hasStructValueReturn ? 1 : 0)];
for (int index = 0; index < parameterTypesLLVM.Length; index++)
{
FunctionParameterType parameterType;
if (hasStructValueReturn && index == 0)
{
parameterType = functionSignature.ReturnType;
}
else
{
parameterType = functionSignature.ParameterTypes[index - firstArgumentIndex];
}
if (parameterType.Type.DefaultTypeLLVM.Value == IntPtr.Zero)
throw new InvalidOperationException();
parameterTypesLLVM[index] = GetFunctionInputParameterTypeLLVM(parameterType);
}
return LLVM.FunctionType(hasStructValueReturn ? LLVM.VoidTypeInContext(context) : GetFunctionInputParameterTypeLLVM(functionSignature.ReturnType), parameterTypesLLVM, false);
}
public ABIParameterInfo(ABIParameterInfoKind kind)
{
Kind = kind;
CoerceType = TypeRef.Empty;
}
private ValueRef GenerateStaticInvokeThunk(Class declaringClass, TypeDefinition delegateType, FieldDefinition methodPtrAuxField)
{
// Reuse same signature as Invoke
var invokeMethod = declaringClass.Functions.Single(x => x.MethodReference.Name == "Invoke");
// Create method
var invokeMethodHelper = LLVM.AddFunction(module, LLVM.GetValueName(invokeMethod.GeneratedValue) + "_Helper",
invokeMethod.FunctionType);
LLVM.PositionBuilderAtEnd(builder2,
LLVM.AppendBasicBlockInContext(context, invokeMethodHelper, string.Empty));
// Ignore first arguments
var helperArgs = new ValueRef[LLVM.CountParams(invokeMethodHelper) - 1];
var helperArgTypes = new TypeRef[helperArgs.Length];
for (int i = 0; i < helperArgs.Length; ++i)
{
helperArgs[i] = LLVM.GetParam(invokeMethodHelper, (uint) i + 1);
helperArgTypes[i] = LLVM.TypeOf(helperArgs[i]);
}
var helperFunctionType = LLVM.FunctionType(LLVM.GetReturnType(invokeMethod.FunctionType), helperArgTypes, false);
// 1. Load static function pointers (arg0->_methodPtrAux)
var @this = LLVM.GetParam(invokeMethodHelper, 0);
var indices = BuildFieldIndices(GetClass(delegateType).Fields[methodPtrAuxField], StackValueType.Object, GetType(declaringClass.Type.TypeReference));
// Find field address using GEP
var fieldAddress = LLVM.BuildInBoundsGEP(builder2, @this, indices, string.Empty);
// Load value from field
var methodPtrAux = LLVM.BuildLoad(builder2, fieldAddress, string.Empty);
methodPtrAux = LLVM.BuildPointerCast(builder2, methodPtrAux, LLVM.PointerType(helperFunctionType, 0), string.Empty);
// 2. Call method
var methodPtrAuxCall = LLVM.BuildCall(builder2, methodPtrAux, helperArgs, string.Empty);
// Return value
if (LLVM.GetReturnType(invokeMethod.FunctionType) != LLVM.VoidTypeInContext(context))
LLVM.BuildRet(builder2, methodPtrAuxCall);
else
LLVM.BuildRetVoid(builder2);
return invokeMethodHelper;
}