public override CILInstructionMethod BuildNode(ParseTreeNode node)
{
CILInstructionMethod result = null;
var instrMethodParseTreeNode = node.GetFirstChildWithGrammarName(GrammarNames.INSTR_METHOD);
var callParseTreeNode = instrMethodParseTreeNode?.GetFirstChildWithGrammarName(GrammarNames.keyword_call);
if (callParseTreeNode != null)
{
result = new CallInstruction();
}
var callvirtParseTreeNode = instrMethodParseTreeNode?.GetFirstChildWithGrammarName(GrammarNames.keyword_callvirt);
if (callvirtParseTreeNode != null)
{
result = new CallVirtualInstruction();
}
var newobjParseTreeNode = instrMethodParseTreeNode?.GetFirstChildWithGrammarName(GrammarNames.keyword_newobj);
if (newobjParseTreeNode != null)
{
result = new NewObjectInstruction();
}
if (result != null)
{
var typeParseTreeNode = node.GetFirstChildWithGrammarName(GrammarNames.type);
result.MethodReturnType = TypeParseTreeNodeHelper.GetType(typeParseTreeNode);
var typeSpecParseTreeNode = node.GetFirstChildWithGrammarName(GrammarNames.typeSpec);
result.TypeSpecification = TypeSpecParseTreeNodeHelper.GetValue(typeSpecParseTreeNode);
var methodNameParseTreeNode = node.GetFirstChildWithGrammarName(GrammarNames.methodName);
result.MethodName = MethodNameParseTreeNodeHelper.GetMethodName(methodNameParseTreeNode);
var sigArgs0ParseTreeNode = node.GetFirstChildWithGrammarName(GrammarNames.sigArgs0);
result.MethodArgumentTypes = SigArgs0ParseTreeNodeHelper.GetTypes(sigArgs0ParseTreeNode);
var callConvParseTreeNode = node.GetFirstChildWithGrammarName(GrammarNames.callConv);
result.CallConvention = CallConvParseTreeNodeHelper.GetValue(callConvParseTreeNode);
return(result);
}
throw new ArgumentException("Cannot recognize CIL instruction method.");
}
public override void VisitCallVirtualInstruction(CallVirtualInstruction instruction)
{
if (!instruction.CallConv.IsInstance)
{
throw new System.NotImplementedException();
}
var methodArgs = PopMethodArgs(instruction);
ControlState.EvaluationStack.PopValue(_program, instruction.TypeSpec.GetCilType(_program), out var thisVal);
var callExternal = true;
CilClassInstance thisClassInstance = null;
CilObject thisObject = null;
if (thisVal is CilValueReference thisValRef)
{
var thisObj = ManagedMemory.Load(thisValRef);
if (thisObj is CilClassInstance)
{
thisClassInstance = thisObj as CilClassInstance;
}
else
{
thisObject = thisObj;
callExternal = true;
}
}
else
{
throw new System.NotImplementedException();
}
CilMethod method = null;
if (thisClassInstance != null)
{
var currentClass = thisClassInstance.Class;
while (true)
{
var possibleMethod = currentClass.Methods.SingleOrDefault(m => m.Name == instruction.MethodName && AreArgumentsAssignable(instruction.SigArgs, m.Arguments));
if (possibleMethod != null)
{
method = possibleMethod;
callExternal = false;
break;
}
currentClass = currentClass.Extends;
if (currentClass == null)
{
callExternal = true;
break;
}
}
}
if (callExternal)
{
var result = CallExternalMethod(instruction, thisVal, methodArgs.ToArray(), null);
if (!(instruction.ReturnType is CilTypeVoid))
{
var resultVal = instruction.ReturnType.CreateValueFromRuntime(result, ManagedMemory, _program);
ControlState.EvaluationStack.PushValue(resultVal);
}
ControlState.MoveToNextInstruction();
}
else
{
var sigArgsWithThis = CompleteSigArgs(instruction, method);
var argsWithThis = CompleteArgs(instruction, methodArgs, thisVal);
var newMethodState = new CilMethodState(method, sigArgsWithThis, argsWithThis, _program);
ControlState.MoveToNextInstruction();
ControlState.CallStack.Push(newMethodState);
}
}
public abstract void VisitCallVirtualInstruction(CallVirtualInstruction instruction);
