static void CreateCcwMethodBody(ComMethodInfo comMethodInfo, MethodBuilder methodBuilder)
{
var methodInfo = comMethodInfo.MethodInfo;
var gen = methodBuilder.GetILGenerator();
var returnTypeNative = comMethodInfo.ReturnValueMarshaller?.NativeParameterType.MakePointerType() ??
comMethodInfo.NativeReturnType;
LocalBuilder returnValueNativeLocal = returnTypeNative != typeof(void) ?
gen.DeclareLocal(returnTypeNative) : null;
// create parameter marshallers
var paramInfos = comMethodInfo.ParameterInfos
.Select((p) => {
var marshaller = p.ValueMarshaller;
var runtimeLocal = gen.DeclareLocal(p.Type);
var toNativeGenerator = p.IsOut ? marshaller.CreateToNativeGenerator(gen) : null;
var toRuntimeGenerator = p.IsIn ? marshaller.CreateToRuntimeGenerator(gen) : null;
var nativeType = p.IsOut ? marshaller.NativeParameterType.MakePointerType() : marshaller.NativeParameterType;
Storage nativeStorage;
if (p.IsReturnValue)
{
nativeStorage = new ParameterStorage(gen, nativeType, comMethodInfo.ParameterInfos.Count());
nativeStorage = new IndirectStorage(nativeStorage);
}
else if (p.IsOut)
{
nativeStorage = new ParameterStorage(gen, p.ParameterInfo.ParameterType, p.ParameterInfo.Position + 1);
nativeStorage = new IndirectStorage(nativeStorage);
}
else
{
nativeStorage = new ParameterStorage(gen, p.Type, p.ParameterInfo.Position + 1);
}
return(new {
ParameterInfo = p,
RuntimeLocal = runtimeLocal,
Marshaller = marshaller,
ToNativeGenerator = toNativeGenerator,
ToRuntimeGenerator = toRuntimeGenerator,
RuntimeStorage = new LocalStorage(gen, runtimeLocal),
NativeStorage = nativeStorage
});
}).ToArray();
// start try/catch
if (comMethodInfo.ReturnsHresult)
{
gen.BeginExceptionBlock();
}
// marshal in parameters
foreach (var paramInfo in paramInfos)
{
paramInfo.ToRuntimeGenerator?.EmitToRuntime(paramInfo.NativeStorage, paramInfo.RuntimeStorage,
move: false);
}
// retrieve GCHandle (read ComClassHeader.handle)
gen.Emit(OpCodes.Ldarg_0);
gen.Emit(OpCodes.Sizeof, typeof(IntPtr)); // skip vtable
gen.Emit(OpCodes.Add);
// GCHandle.Target
gen.Emit(OpCodes.Call, targetGetter);
// convert to the target interface type
gen.Emit(OpCodes.Castclass, comMethodInfo.MethodInfo.DeclaringType);
// push each parameters
foreach (var paramInfo in paramInfos)
{
if (paramInfo.ParameterInfo.IsReturnValue)
{
continue;
}
if (paramInfo.ParameterInfo.IsOut)
{
// out/inout parameter
gen.Emit(OpCodes.Ldloca, paramInfo.RuntimeLocal);
}
else
{
paramInfo.RuntimeStorage.EmitLoad();
}
}
// call it!
gen.Emit(OpCodes.Callvirt, comMethodInfo.MethodInfo);
if (comMethodInfo.ReturnValueMarshaller != null)
{
if (comMethodInfo.ReturnsHresult)
{
throw new InvalidOperationException();
}
// marshal real return value
var runtimeLocal = gen.DeclareLocal(comMethodInfo.MethodInfo.ReturnType);
gen.Emit(OpCodes.Stloc, runtimeLocal);
comMethodInfo.ReturnValueMarshaller.CreateToNativeGenerator(gen)
.EmitToNative(new LocalStorage(gen, runtimeLocal),
new LocalStorage(gen, returnValueNativeLocal));
}
foreach (var paramInfo in paramInfos)
{
// save [out, retval]
if (paramInfo.ParameterInfo.IsReturnValue)
{
paramInfo.RuntimeStorage.EmitStore();
}
}
foreach (var paramInfo in paramInfos)
{
// marshal "out" parameters and optionally return value parameter
if (paramInfo.ToNativeGenerator != null)
{
// drop existing values
paramInfo.ToNativeGenerator.EmitDestructNativeValue(paramInfo.NativeStorage);
// marshal
paramInfo.ToNativeGenerator.EmitToNative(paramInfo.RuntimeStorage, paramInfo.NativeStorage);
}
}
// handle exceptions
if (comMethodInfo.ReturnsHresult)
{
gen.Emit(OpCodes.Ldc_I4_0);
gen.Emit(OpCodes.Stloc, returnValueNativeLocal);
gen.BeginCatchBlock(typeof(Exception));
// get hresult
gen.Emit(OpCodes.Callvirt, hresultGetter);
// store HRESULT
gen.Emit(OpCodes.Stloc, returnValueNativeLocal);
gen.EndExceptionBlock();
}
// return
if (returnValueNativeLocal != null)
{
gen.Emit(OpCodes.Ldloc, returnValueNativeLocal);
}
gen.Emit(OpCodes.Ret);
}
static void CreateRCWMethodBody(ComMethodInfo comMethodInfo, FieldInfo ptrFieldInfo, MethodBuilder methodBuilder)
{
var methodInfo = comMethodInfo.MethodInfo;
if ((ptrFieldInfo == null) != comMethodInfo.IsFirstParameterFunctionPtr)
{
throw new InvalidOperationException();
}
// generate a method body
var gen = methodBuilder.GetILGenerator();
LocalBuilder returnValueLocal = methodInfo.ReturnType != typeof(void) ?
gen.DeclareLocal(methodInfo.ReturnType) : null;
bool isInstanceMethod = (methodBuilder.Attributes & MethodAttributes.Static) == 0;
// create parameter marshallers
var paramInfos = comMethodInfo.ParameterInfos
.Select((p) => {
var marshaller = p.ValueMarshaller;
var nativeLocal = gen.DeclareLocal(marshaller.NativeParameterType);
var nativeLocalPin = p.IsOut ? gen.DeclareLocal(p.NativeType.MakePointerType(), true) : null;
var toNativeGenerator = p.IsIn ? marshaller.CreateToNativeGenerator(gen) : null;
var toRuntimeGenerator = p.IsOut ? marshaller.CreateToRuntimeGenerator(gen) : null;
Storage storage;
if (p.IsReturnValue)
{
storage = new LocalStorage(gen, returnValueLocal);
}
else if (p.IsOut)
{
storage = new ParameterStorage(gen, p.ParameterInfo.ParameterType, p.ParameterInfo.Position + (isInstanceMethod ? 1 : 0));
storage = new IndirectStorage(storage);
}
else
{
storage = new ParameterStorage(gen, p.Type, p.ParameterInfo.Position + (isInstanceMethod ? 1 : 0));
}
return(new {
ParameterInfo = p,
NativeLocal = nativeLocal,
NativeLocalPin = nativeLocalPin,
Marshaller = marshaller,
ToNativeGenerator = toNativeGenerator,
ToRuntimeGenerator = toRuntimeGenerator,
Storage = storage,
NativeStorage = new LocalStorage(gen, nativeLocal),
});
}).ToArray();
// marshal in parameters
foreach (var paramInfo in paramInfos)
{
if (paramInfo.ToNativeGenerator != null)
{
paramInfo.ToNativeGenerator.EmitToNative(paramInfo.Storage, paramInfo.NativeStorage);
}
}
// pin by-ref parameters
foreach (var paramInfo in paramInfos)
{
if (paramInfo.ParameterInfo.IsOut)
{
paramInfo.NativeStorage.EmitLoadAddress();
gen.Emit(OpCodes.Stloc, paramInfo.NativeLocalPin);
}
}
// push the interface pointer
if (comMethodInfo.IsFirstNativeParameterInterfacePtr)
{
if (ptrFieldInfo == null)
{
throw new InvalidOperationException();
}
gen.Emit(OpCodes.Ldarg_0);
gen.Emit(OpCodes.Ldfld, ptrFieldInfo);
}
// push each parameters
foreach (var paramInfo in paramInfos)
{
if (paramInfo.ParameterInfo.IsOut)
{
// out/inout parameter
gen.Emit(OpCodes.Ldloc, paramInfo.NativeLocalPin);
}
else
{
paramInfo.NativeStorage.EmitLoad();
}
}
if (comMethodInfo.IsFirstParameterFunctionPtr)
{
// load the function ptr
gen.Emit(OpCodes.Ldarg_0);
}
else
{
// get the interface pointer
gen.Emit(OpCodes.Ldarg_0);
gen.Emit(OpCodes.Ldfld, ptrFieldInfo);
// get vtable
gen.Emit(OpCodes.Ldind_I);
// load the vtable element
int vtableIndex = comMethodInfo.VTableOffset;
if (vtableIndex > 0)
{
gen.Emit(OpCodes.Sizeof, typeof(IntPtr));
if (vtableIndex > 1)
{
gen.Emit(OpCodes.Ldc_I4, vtableIndex);
gen.Emit(OpCodes.Mul);
}
gen.Emit(OpCodes.Conv_I);
gen.Emit(OpCodes.Add);
}
gen.Emit(OpCodes.Ldind_I);
}
var nativeParamTypes = new List <Type>();
if (comMethodInfo.IsFirstNativeParameterInterfacePtr)
{
nativeParamTypes.Add(typeof(IntPtr));
}
nativeParamTypes.AddRange(paramInfos.Select((p) => p.ParameterInfo.IsOut ?
p.Marshaller.NativeParameterType.MakePointerType() : p.Marshaller.NativeParameterType));
// call!
gen.EmitCalli(OpCodes.Calli, CallingConventions.Standard,
comMethodInfo.NativeReturnType, nativeParamTypes.ToArray(), null);
if (comMethodInfo.ReturnsHresult)
{
// handle COM error
// ThrowExceptionForHR is extremely slow (60~ cycles) on some environments (namely, Mono)
// check the HRESULT before passing it to ThrowExceptionForHR
var resultLocal = gen.DeclareLocal(typeof(int));
gen.Emit(OpCodes.Dup);
gen.Emit(OpCodes.Stloc, resultLocal);
var noErrorLabel = gen.DefineLabel();
gen.Emit(OpCodes.Ldc_I4_0);
gen.Emit(OpCodes.Bge, noErrorLabel);
// clean-up
foreach (var paramInfo in paramInfos)
{
// destruct "out" parameters and optionally return value parameter
if (paramInfo.ToRuntimeGenerator != null)
{
paramInfo.ToRuntimeGenerator.EmitDestructNativeValue(paramInfo.NativeStorage);
}
// destruct native values for "in" parameters
if (!paramInfo.ParameterInfo.IsOut && paramInfo.ToNativeGenerator != null)
{
paramInfo.ToNativeGenerator.EmitDestructNativeValue(paramInfo.NativeStorage);
}
}
gen.Emit(OpCodes.Ldloc, resultLocal);
gen.EmitCall(OpCodes.Call, throwExceptionForHRMethod, null);
gen.MarkLabel(noErrorLabel);
}
if (comMethodInfo.ReturnValueMarshaller != null)
{
if (comMethodInfo.ReturnsHresult)
{
throw new InvalidOperationException();
}
// marshal return value
var nativeLocal = gen.DeclareLocal(comMethodInfo.NativeReturnType);
gen.Emit(OpCodes.Stloc, nativeLocal);
comMethodInfo.ReturnValueMarshaller.CreateToRuntimeGenerator(gen)
.EmitToRuntime(new LocalStorage(gen, nativeLocal),
new LocalStorage(gen, returnValueLocal), move: true);
}
// unpin by-ref parameters
foreach (var paramInfo in paramInfos)
{
if (paramInfo.ParameterInfo.IsOut)
{
gen.Emit(OpCodes.Ldc_I4_0);
gen.Emit(OpCodes.Conv_I);
gen.Emit(OpCodes.Stloc, paramInfo.NativeLocalPin);
}
}
foreach (var paramInfo in paramInfos)
{
// marshal "out" parameters and optionally return value parameter
if (paramInfo.ToRuntimeGenerator != null)
{
paramInfo.ToRuntimeGenerator.EmitToRuntime(paramInfo.NativeStorage, paramInfo.Storage, move: true);
}
// destruct native values for "in" parameters
if (!paramInfo.ParameterInfo.IsOut && paramInfo.ToNativeGenerator != null)
{
paramInfo.ToNativeGenerator.EmitDestructNativeValue(paramInfo.NativeStorage);
}
}
// return
if (methodInfo.ReturnType != typeof(void))
{
gen.Emit(OpCodes.Ldloc, returnValueLocal);
}
gen.Emit(OpCodes.Ret);
}
