public Delegate CreateDelegate(Type delegateType, object dynamicObject)
{
Assert.NotNull(delegateType, dynamicObject);
object[] closure;
lock (_closureMap) {
if (!_closureMap.TryGetValue(dynamicObject, out WeakReference weakClosure) || (closure = (object[])weakClosure.Target) == null)
{
closure = new[] { TargetPlaceHolder, CallSitePlaceHolder, ConvertSitePlaceHolder };
_closureMap[dynamicObject] = new WeakReference(closure);
Type[] siteTypes = MakeSiteSignature(_parameterTypes);
CallSite callSite = CallSite.Create(DynamicSiteHelpers.MakeCallSiteDelegate(siteTypes), _invokeBinder);
CallSite convertSite = null;
if (_returnType != typeof(void))
{
convertSite = CallSite.Create(DynamicSiteHelpers.MakeCallSiteDelegate(typeof(object), _returnType), _convertBinder);
}
closure[TargetIndex] = dynamicObject;
closure[CallSiteIndex] = callSite;
closure[ConvertSiteIndex] = convertSite;
}
}
return(_method.CreateDelegate(delegateType, closure));
}
internal Delegate CreateDelegate(Type delegateType, object target)
{
Assert.NotNull(delegateType, target);
// to enable:
// function x() { }
// someClass.someEvent += delegateType(x)
// someClass.someEvent -= delegateType(x)
//
// we need to avoid re-creating the object array because they won't
// be compare equal when removing the delegate if they're difference
// instances. Therefore we use a weak hashtable to get back the
// original object array. The values also need to be weak to avoid
// creating a circular reference from the constants target back to the
// target. This is fine because as long as the delegate is referenced
// the object array will stay alive. Once the delegate is gone it's not
// wired up anywhere and -= will never be used again.
object[] clone;
lock (_constantMap) {
WeakReference cloneRef;
if (!_constantMap.TryGetValue(target, out cloneRef) ||
(clone = (object[])cloneRef.Target) == null)
{
_constantMap[target] = new WeakReference(clone = (object[])_constants.Clone());
Type[] siteTypes = MakeSiteSignature();
CallSite callSite = CallSite.Create(DynamicSiteHelpers.MakeCallSiteDelegate(siteTypes), _invokeBinder);
Type siteType = callSite.GetType();
Type convertSiteType = null;
CallSite convertSite = null;
if (_returnType != typeof(void))
{
convertSite = CallSite.Create(DynamicSiteHelpers.MakeCallSiteDelegate(typeof(object), _returnType), _convertBinder);
convertSiteType = convertSite.GetType();
}
Debug.Assert(clone[0] == TargetPlaceHolder);
Debug.Assert(clone[1] == CallSitePlaceHolder);
Debug.Assert(clone[2] == ConvertSitePlaceHolder);
clone[0] = target;
clone[1] = callSite;
clone[2] = convertSite;
}
}
return(ReflectionUtils.CreateDelegate(_method, delegateType, clone));
}
internal static Delegate CreateDelegateForDynamicObject(LanguageContext context, object dynamicObject, Type delegateType, MethodInfo invoke)
{
PerfTrack.NoteEvent(PerfTrack.Categories.DelegateCreate, delegateType.ToString());
Type returnType = invoke.ReturnType;
ParameterInfo[] parameterInfos = invoke.GetParameters();
var parameters = new List <ParameterExpression>();
for (int i = 0; i < parameterInfos.Length; i++)
{
parameters.Add(Expression.Parameter(parameterInfos[i].ParameterType, "p" + i));
}
InvokeBinder invokeBinder = context.CreateInvokeBinder(new CallInfo(parameterInfos.Length));
ConvertBinder convertBinder = (returnType != typeof(void)) ? context.CreateConvertBinder(returnType, explicitCast: true) : null;
CallSite invokeSite = CallSite.Create(DynamicSiteHelpers.MakeCallSiteDelegate(MakeSiteSignature(parameterInfos)), invokeBinder);
Type invokeSiteType = invokeSite.GetType();
Type convertSiteType;
CallSite convertSite;
if (convertBinder != null)
{
convertSite = CallSite.Create(DynamicSiteHelpers.MakeCallSiteDelegate(typeof(object), returnType), convertBinder);
convertSiteType = convertSite.GetType();
}
else
{
convertSiteType = null;
convertSite = null;
}
var locals = new List <ParameterExpression>();
ParameterExpression invokeSiteVar = Expression.Parameter(invokeSiteType, "site");
ParameterExpression convertSiteVar = null;
var args = new List <Expression>();
args.Add(invokeSiteVar);
args.Add(Expression.Constant(dynamicObject));
int strongBoxVarsStart = locals.Count;
for (int i = 0; i < parameterInfos.Length; i++)
{
if (parameterInfos[i].ParameterType.IsByRef)
{
var argType = parameterInfos[i].ParameterType;
Type elementType = argType.GetElementType();
Type concreteType = typeof(StrongBox <>).MakeGenericType(elementType);
var strongBox = Expression.Parameter(concreteType, "box" + i);
locals.Add(strongBox);
args.Add(
Expression.Assign(
strongBox,
Expression.New(
concreteType.GetConstructor(new Type[] { elementType }),
parameters[i]
)
)
);
}
else
{
args.Add(parameters[i]);
}
}
int strongBoxVarsEnd = locals.Count;
Expression invocation = Expression.Invoke(
Expression.Field(
Expression.Assign(
invokeSiteVar,
Expression.Convert(Expression.Constant(invokeSite), invokeSiteType)
),
invokeSiteType.GetDeclaredField("Target")
),
args
);
if (convertBinder != null)
{
convertSiteVar = Expression.Parameter(convertSiteType, "convertSite");
invocation = Expression.Invoke(
Expression.Field(
Expression.Assign(
convertSiteVar,
Expression.Convert(Expression.Constant(convertSite), convertSiteType)
),
convertSiteType.GetDeclaredField("Target")
),
convertSiteVar,
invocation
);
}
locals.Add(invokeSiteVar);
if (convertSiteVar != null)
{
locals.Add(convertSiteVar);
}
Expression body;
// copy back from StrongBox.Value
if (strongBoxVarsEnd > strongBoxVarsStart)
{
var block = new Expression[1 + strongBoxVarsEnd - strongBoxVarsStart + 1];
var resultVar = Expression.Parameter(invocation.Type, "result");
locals.Add(resultVar);
int b = 0;
int l = strongBoxVarsStart;
// values of strong boxes are initialized in invocation expression:
block[b++] = Expression.Assign(resultVar, invocation);
for (int i = 0; i < parameterInfos.Length; i++)
{
if (parameterInfos[i].ParameterType.IsByRef)
{
var local = locals[l++];
block[b++] = Expression.Assign(
parameters[i],
Expression.Field(local, local.Type.GetDeclaredField("Value"))
);
}
}
block[b++] = resultVar;
Debug.Assert(l == strongBoxVarsEnd);
Debug.Assert(b == block.Length);
body = Expression.Block(locals, block);
}
else
{
body = Expression.Block(locals, invocation);
}
var lambda = Expression.Lambda(delegateType, body, "_Scripting_", parameters);
return(lambda.Compile());
}
/// <summary>
/// Generates stub to receive the CLR call and then call the dynamic language code.
/// </summary>
private void EmitClrCallStub(ILGen cg)
{
List <ReturnFixer> fixers = new List <ReturnFixer>(0);
// Create strongly typed return type from the site.
// This will, among other things, generate tighter code.
Type[] siteTypes = MakeSiteSignature(_parameterTypes);
CallSite callSite = CallSite.Create(DynamicSiteHelpers.MakeCallSiteDelegate(siteTypes), _invokeBinder);
Type siteType = callSite.GetType();
Type convertSiteType = null;
CallSite convertSite = null;
if (_returnType != typeof(void))
{
convertSite = CallSite.Create(DynamicSiteHelpers.MakeCallSiteDelegate(typeof(object), _returnType), _convertBinder);
convertSiteType = convertSite.GetType();
}
LocalBuilder convertSiteLocal = null;
FieldInfo convertTarget = null;
if (_returnType != typeof(void))
{
// load up the conversion logic on the stack
convertSiteLocal = cg.DeclareLocal(convertSiteType);
EmitConstantGet(cg, ConvertSiteIndex, convertSiteType);
cg.Emit(OpCodes.Dup);
cg.Emit(OpCodes.Stloc, convertSiteLocal);
convertTarget = convertSiteType.GetDeclaredField("Target");
cg.EmitFieldGet(convertTarget);
cg.Emit(OpCodes.Ldloc, convertSiteLocal);
}
// load up the invoke logic on the stack
LocalBuilder site = cg.DeclareLocal(siteType);
EmitConstantGet(cg, CallSiteIndex, siteType);
cg.Emit(OpCodes.Dup);
cg.Emit(OpCodes.Stloc, site);
FieldInfo target = siteType.GetDeclaredField("Target");
cg.EmitFieldGet(target);
cg.Emit(OpCodes.Ldloc, site);
EmitConstantGet(cg, TargetIndex, typeof(object));
for (int i = 0; i < _parameterTypes.Length; i++)
{
if (_parameterTypes[i].IsByRef)
{
ReturnFixer rf = ReturnFixer.EmitArgument(cg, i + 1, _parameterTypes[i]);
if (rf != null)
{
fixers.Add(rf);
}
}
else
{
cg.EmitLoadArg(i + 1);
}
}
// emit the invoke for the call
cg.EmitCall(target.FieldType, "Invoke");
// emit the invoke for the convert
if (_returnType == typeof(void))
{
cg.Emit(OpCodes.Pop);
}
else
{
cg.EmitCall(convertTarget.FieldType, "Invoke");
}
// fixup any references
foreach (ReturnFixer rf in fixers)
{
rf.FixReturn(cg);
}
cg.Emit(OpCodes.Ret);
}
