public static object CallMethod(string methodName, IList<Type> typeArgs, bool isStatic, Type t, object target, params object[] args)
{
Expression targetExpr = isStatic ? Expression.Constant(t, typeof(Type)) : Expression.Constant(target);
List<Expression> exprs = new List<Expression>();
foreach (object arg in args)
exprs.Add(Expression.Constant(arg));
Expression[] argExprs = ClrExtensions.ArrayInsert<Expression>(targetExpr, exprs);
// TODO: Get rid of Default
InvokeMemberBinder binder = new ClojureInvokeMemberBinder(ClojureContext.Default, methodName, argExprs.Length, isStatic);
Expression dyn = Expression.Dynamic(binder, typeof(object), argExprs);
LambdaExpression lambda = Expression.Lambda<clojure.lang.Compiler.ReplDelegate>(dyn);
return lambda.Compile().DynamicInvoke();
}
private void EmitComplexCall(ObjExpr objx, CljILGen ilg)
{
// TOD: We have gotten rid of light-compile. Simplify this.
// This is made more complex than I'd like by light-compiling.
// Without light-compile, we could just:
// Emit the target expression
// Emit the arguments (and build up the parameter list for the lambda)
// Create the lambda, compile to a methodbuilder, and call it.
// Light-compile forces us to
// create a lambda at the beginning because we must
// compile it to a delegate, to get the type
// write code to grab the delegate from a cache
// Then emit the target expression
// emit the arguments (but note we need already to have built the parameter list)
// Call the delegate
// Combined, this becomes
// Build the parameter list
// Build the dynamic call and lambda (slightly different for light-compile vs full)
// if light-compile
// build the delegate
// cache it
// emit code to retrieve and cast it
// emit the target expression
// emit the args
// emit the call (slightly different for light compile vs full)
//
// Build the parameter list
List<ParameterExpression> paramExprs = new List<ParameterExpression>(_args.Count + 1);
List<Type> paramTypes = new List<Type>(_args.Count + 1);
Type targetType = GetTargetType();
if (!targetType.IsPrimitive)
targetType = typeof(object);
paramExprs.Add(Expression.Parameter(targetType));
paramTypes.Add(targetType);
int i = 0;
foreach (HostArg ha in _args)
{
i++;
Expr e = ha.ArgExpr;
Type argType = e.HasClrType && e.ClrType != null && e.ClrType.IsPrimitive ? e.ClrType : typeof(object);
switch (ha.ParamType)
{
case HostArg.ParameterType.ByRef:
{
Type byRefType = argType.MakeByRefType();
paramExprs.Add(Expression.Parameter(byRefType, ha.LocalBinding.Name));
paramTypes.Add(byRefType);
break;
}
case HostArg.ParameterType.Standard:
if (argType.IsPrimitive && ha.ArgExpr is MaybePrimitiveExpr)
{
paramExprs.Add(Expression.Parameter(argType, ha.LocalBinding != null ? ha.LocalBinding.Name : "__temp_" + i));
paramTypes.Add(argType);
}
else
{
paramExprs.Add(Expression.Parameter(typeof(object), ha.LocalBinding != null ? ha.LocalBinding.Name : "__temp_" + i));
paramTypes.Add(typeof(object));
}
break;
default:
throw Util.UnreachableCode();
}
}
// Build dynamic call and lambda
Type returnType = HasClrType ? ClrType : typeof(object);
InvokeMemberBinder binder = new ClojureInvokeMemberBinder(ClojureContext.Default, _methodName, paramExprs.Count, IsStaticCall);
// This is what I want to do.
//DynamicExpression dyn = Expression.Dynamic(binder, typeof(object), paramExprs);
// Unfortunately, the Expression.Dynamic method does not respect byRef parameters.
// The workaround appears to be to roll your delegate type and then use Expression.MakeDynamic, as below.
List<Type> callsiteParamTypes = new List<Type>(paramTypes.Count + 1);
callsiteParamTypes.Add(typeof(System.Runtime.CompilerServices.CallSite));
callsiteParamTypes.AddRange(paramTypes);
Type dynType = Microsoft.Scripting.Generation.Snippets.Shared.DefineDelegate("__interop__", returnType, callsiteParamTypes.ToArray());
#if CLR2
// Not covariant. Sigh.
List<Expression> paramsAsExprs = new List<Expression>(paramExprs.Count);
paramsAsExprs.AddRange(paramExprs.ToArray());
DynamicExpression dyn = Expression.MakeDynamic(dynType, binder, paramsAsExprs);
#else
DynamicExpression dyn = Expression.MakeDynamic(dynType, binder, paramExprs);
#endif
LambdaExpression lambda;
Type delType;
MethodBuilder mbLambda;
EmitDynamicCallPreamble(dyn, _spanMap, "__interop_" + _methodName + RT.nextID(), returnType, paramExprs, paramTypes.ToArray(), ilg, out lambda, out delType, out mbLambda);
// Emit target + args
EmitTargetExpression(objx, ilg);
i = 0;
foreach (HostArg ha in _args)
{
i++;
Expr e = ha.ArgExpr;
Type argType = e.HasClrType && e.ClrType != null && e.ClrType.IsPrimitive ? e.ClrType : typeof(object);
switch (ha.ParamType)
{
case HostArg.ParameterType.ByRef:
EmitByRefArg(ha,objx,ilg);
break;
case HostArg.ParameterType.Standard:
if (argType.IsPrimitive && ha.ArgExpr is MaybePrimitiveExpr)
{
((MaybePrimitiveExpr)ha.ArgExpr).EmitUnboxed(RHC.Expression, objx, ilg);
}
else
{
ha.ArgExpr.Emit(RHC.Expression, objx, ilg);
}
break;
default:
throw Util.UnreachableCode();
}
}
EmitDynamicCallPostlude(lambda, delType, mbLambda, ilg);
}
private Expression GenerateComplexCall(ObjExpr objx, GenContext context)
{
Expression call;
Expression target = GenTargetExpression(objx, context);
List<Expression> exprs = new List<Expression>(_args.Count);
List<ParameterExpression> sbParams = new List<ParameterExpression>();
List<Expression> sbInits = new List<Expression>();
List<Expression> sbTransfers = new List<Expression>();
GenerateComplexArgList(objx, context, _args, out exprs, out sbParams, out sbInits, out sbTransfers);
Expression[] argExprs = ClrExtensions.ArrayInsert<Expression>(target, exprs);
Type returnType = HasClrType ? ClrType : typeof(object);
// TODO: Get rid of Default
InvokeMemberBinder binder = new ClojureInvokeMemberBinder(ClojureContext.Default,_methodName, argExprs.Length, IsStaticCall);
//DynamicExpression dyn = Expression.Dynamic(binder, returnType, argExprs);
DynamicExpression dyn = Expression.Dynamic(binder, typeof(object), argExprs);
//if (context.Mode == CompilerMode.File)
if ( context.DynInitHelper != null )
call = context.DynInitHelper.ReduceDyn(dyn);
else
call = dyn;
if (returnType == typeof(void))
call = Expression.Block(call, Expression.Default(typeof(object)));
else
call = Expression.Convert(call, returnType);
if (sbParams.Count > 0)
{
// We have ref/out params. Construct the complicated call;
ParameterExpression callValParam = Expression.Parameter(returnType, "__callVal");
ParameterExpression[] allParams = ClrExtensions.ArrayInsert<ParameterExpression>(callValParam, sbParams);
call = Expression.Block(
returnType,
allParams,
Expression.Block(sbInits),
Expression.Assign(callValParam, call),
Expression.Block(sbTransfers),
callValParam);
}
return call;
}