public DelegateInfo(LanguageContext context, Type returnType, Type[] parameters)
{
Assert.NotNull(returnType);
Assert.NotNullItems(parameters);
_returnType = returnType;
_parameterTypes = parameters;
PerfTrack.NoteEvent(PerfTrack.Categories.DelegateCreate, ToString());
if (_returnType != typeof(void))
{
_convertBinder = context.CreateConvertBinder(_returnType, true);
}
_invokeBinder = context.CreateInvokeBinder(new CallInfo(_parameterTypes.Length));
Type[] delegateParams = new Type[1 + _parameterTypes.Length];
delegateParams[0] = typeof(object[]);
for (int i = 0; i < _parameterTypes.Length; i++)
{
delegateParams[1 + i] = _parameterTypes[i];
}
EmitClrCallStub(returnType, delegateParams, out _method);
}
internal DelegateInfo(LanguageContext context, Type returnType, ParameterInfo[] parameters)
{
Assert.NotNull(returnType);
Assert.NotNullItems(parameters);
_returnType = returnType;
_parameters = parameters;
PerfTrack.NoteEvent(PerfTrack.Categories.DelegateCreate, ToString());
if (_returnType != typeof(void))
{
_convertBinder = context.CreateConvertBinder(_returnType, true);
}
_invokeBinder = context.CreateInvokeBinder(new CallInfo(_parameters.Length));
Type[] delegateParams = new Type[_parameters.Length];
for (int i = 0; i < _parameters.Length; i++)
{
delegateParams[i] = _parameters[i].ParameterType;
}
// Create the method with a special name so the langauge compiler knows that method's stack frame is not visible
DynamicILGen cg = Snippets.Shared.CreateDynamicMethod("_Scripting_", _returnType, ArrayUtils.Insert(typeof(object[]), delegateParams), false);
// Emit the stub
_constants = EmitClrCallStub(cg);
_method = cg.Finish();
}
/// <summary>
/// Gets the member name from the object obj and converts it to the type T. The conversion will be explicit or implicit
/// depending on what the langauge prefers. Throws an exception if the member does not exist, is write-only, or cannot be converted.
/// </summary>
public T GetMember <T>(object obj, string name, bool ignoreCase)
{
CallSite <Func <CallSite, object, T> > convertSite = GetOrCreateSite <object, T>(_lc.CreateConvertBinder(typeof(T), null));
CallSite <Func <CallSite, object, object> > site = GetOrCreateSite <object, object>(_lc.CreateGetMemberBinder(name, ignoreCase));
return(convertSite.Target(convertSite, site.Target(site, obj)));
}
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 object[] EmitClrCallStub(ILGen cg)
{
List <ReturnFixer> fixers = new List <ReturnFixer>(0);
ArgumentInfo[] args = new ArgumentInfo[_parameters.Length];
for (int i = 0; i < args.Length; i++)
{
args[i] = Expression.PositionalArg(i);
}
ConvertBinder convert = _context.CreateConvertBinder(_returnType, true);
InvokeBinder action = _context.CreateInvokeBinder(args);
// Create strongly typed return type from the site.
// This will, among other things, generate tighter code.
Type[] siteTypes = MakeSiteSignature();
Type siteType = DynamicSiteHelpers.MakeCallSiteType(siteTypes);
CallSite callSite = DynamicSiteHelpers.MakeSite(action, siteType);
Type convertSiteType = null;
CallSite convertSite = null;
if (_returnType != typeof(void))
{
convertSiteType = DynamicSiteHelpers.MakeCallSiteType(typeof(object), _returnType);
convertSite = DynamicSiteHelpers.MakeSite(convert, convertSiteType);
}
// build up constants array
object[] constants = new object[] { TargetPlaceHolder, callSite, convertSite };
const int TargetIndex = 0, CallSiteIndex = 1, ConvertSiteIndex = 2;
LocalBuilder convertSiteLocal = null;
FieldInfo convertTarget = null;
if (_returnType != typeof(void))
{
// load up the conversesion logic on the stack
convertSiteLocal = cg.DeclareLocal(convertSiteType);
EmitConstantGet(cg, ConvertSiteIndex, convertSiteType);
cg.Emit(OpCodes.Dup);
cg.Emit(OpCodes.Stloc, convertSiteLocal);
convertTarget = convertSiteType.GetField("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.GetField("Target");
cg.EmitFieldGet(target);
cg.Emit(OpCodes.Ldloc, site);
EmitConstantGet(cg, TargetIndex, typeof(object));
for (int i = 0; i < _parameters.Length; i++)
{
if (_parameters[i].ParameterType.IsByRef)
{
ReturnFixer rf = ReturnFixer.EmitArgument(cg, i + 1, _parameters[i].ParameterType);
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);
return(constants);
}
