/// <summary>
/// Create the body of the invoke method.
/// </summary>
private static MethodBody CreateInvokeBody(ISourceLocation sequencePoint, AssemblyCompiler compiler, DexTargetPackage targetPackage, XMethodDefinition calledMethod, XMethodDefinition invokeMethod, Prototype invokePrototype, Prototype calledMethodPrototype, FieldDefinition instanceField, ClassReference delegateClass)
{
var body = new MethodBody(null);
var rthis = body.AllocateRegister(RCategory.Argument, RType.Object);
foreach (var p in invokePrototype.Parameters)
{
if (p.Type.IsWide())
{
body.AllocateWideRegister(RCategory.Argument);
}
else
{
var type = (p.Type is PrimitiveType) ? RType.Value : RType.Object;
body.AllocateRegister(RCategory.Argument, type);
}
}
var incomingMethodArgs = body.Registers.ToArray();
// Create code
var ins = body.Instructions;
Register instance = null;
if (!calledMethod.IsStatic)
{
// load instance
instance = body.AllocateRegister(RCategory.Temp, RType.Object);
ins.Add(new Instruction(RCode.Iget_object, instance, rthis) { Operand = instanceField });
}
// Invoke
var calledMethodRef = calledMethod.GetReference(targetPackage);
var inputArgs = calledMethod.IsStatic ? incomingMethodArgs.Skip(1).ToArray() : incomingMethodArgs;
// Cast arguments (if needed)
var outputArgs = new List<Register>();
if (!calledMethod.IsStatic)
{
outputArgs.Add(instance);
}
var parameterIndex = 0;
for (var i = calledMethod.IsStatic ? 0 : 1; i < inputArgs.Length; )
{
var invokeType = invokePrototype.Parameters[parameterIndex].Type;
var inputIsWide = invokeType.IsWide();
var calledType = calledMethodPrototype.Parameters[parameterIndex].Type;
if (!invokeType.Equals(calledType))
{
// Add cast / unbox
var source = inputIsWide
? new RegisterSpec(inputArgs[i], inputArgs[i + 1], invokeType)
: new RegisterSpec(inputArgs[i], null, invokeType);
var tmp = ins.Unbox(sequencePoint, source, calledMethod.Parameters[parameterIndex].ParameterType, compiler, targetPackage, body);
outputArgs.Add(tmp.Result.Register);
if (calledType.IsWide())
{
outputArgs.Add(tmp.Result.Register2);
}
}
else
{
outputArgs.Add(inputArgs[i]);
if (calledType.IsWide())
{
outputArgs.Add(inputArgs[i + 1]);
}
}
i += inputIsWide ? 2 : 1;
parameterIndex++;
}
// Actual call
ins.Add(new Instruction(calledMethod.Invoke(calledMethod, null), calledMethodRef, outputArgs.ToArray()));
// Collect return value
var invokeReturnType = invokePrototype.ReturnType;
var calledReturnType = calledMethodPrototype.ReturnType;
var needsBoxing = !invokeReturnType.Equals(calledReturnType);
Instruction returnInstruction;
if (calledReturnType.IsWide())
{
var r = body.AllocateWideRegister(RCategory.Temp);
ins.Add(new Instruction(RCode.Move_result_wide, r.Item1));
if (needsBoxing)
{
// Box
var source = new RegisterSpec(r.Item1, r.Item2, calledReturnType);
var tmp = ins.Box(sequencePoint, source, calledMethod.ReturnType, targetPackage, body);
returnInstruction = new Instruction(RCode.Return_object, tmp.Result.Register);
}
else
{
// Return wide
returnInstruction = new Instruction(RCode.Return_wide, r.Item1);
}
}
else if (calledMethod.ReturnType.IsVoid())
{
// Void return
returnInstruction = new Instruction(RCode.Return_void);
}
else if (calledReturnType is PrimitiveType)
{
// Single register return
var r = body.AllocateRegister(RCategory.Temp, RType.Value);
ins.Add(new Instruction(RCode.Move_result, r));
if (needsBoxing)
{
// Box
var source = new RegisterSpec(r, null, invokeReturnType);
var tmp = ins.Box(sequencePoint, source, calledMethod.ReturnType, targetPackage, body);
returnInstruction = new Instruction(RCode.Return_object, tmp.Result.Register);
}
else
{
// Return
returnInstruction = new Instruction(RCode.Return, r);
}
}
else
{
var r = body.AllocateRegister(RCategory.Temp, RType.Object);
ins.Add(new Instruction(RCode.Move_result_object, r));
if (needsBoxing)
{
// Box
var source = new RegisterSpec(r, null, invokeReturnType);
var tmp = ins.Box(sequencePoint, source, invokeMethod.ReturnType, targetPackage, body);
returnInstruction = new Instruction(RCode.Return_object, tmp.Result.Register);
}
else
{
// Return
returnInstruction = new Instruction(RCode.Return_object, r);
}
}
// Call next delegate (if any)
var next = body.AllocateRegister(RCategory.Temp, RType.Object);
var multicastDelegateType = new ClassReference(targetPackage.NameConverter.GetConvertedFullName("System.MulticastDelegate"));
var nextReference = new FieldReference(multicastDelegateType, "next", multicastDelegateType);
ins.Add(new Instruction(RCode.Iget_object, nextReference, new[] { next, rthis })); // load this.next
var afterCallNext = new Instruction(RCode.Nop);
ins.Add(new Instruction(RCode.If_eqz, afterCallNext, new[] { next })); // if next == null, continue
ins.Add(new Instruction(RCode.Check_cast, delegateClass, new[] { next }));
var nextInvokeMethod = new MethodReference(delegateClass, "Invoke", invokePrototype);
var nextInvokeArgs = new[] { next }.Concat(incomingMethodArgs.Skip(1)).ToArray();
ins.Add(new Instruction(RCode.Invoke_virtual, nextInvokeMethod, nextInvokeArgs));
ins.Add(afterCallNext);
// Add return instructions
ins.Add(returnInstruction);
return body;
}