public bool Set(ulong key, GearsValue value)
{
bool exists = _Table.ContainsKey(key);
_Table[key] = value;
return(!exists);
}
/// <summary>
/// Reset the VM. Heap, globals, and stack are cleared.
/// Then the VM is run once, unless firstRun == false
/// </summary>
internal Gears Reset(GearsChunk chunk, bool firstRun)
{
Chunk = chunk;
_SP = 0;
for (int i = 0; i < _Stack.Length; i++)
{
_Stack[i] = 0;
}
_FrameCount = 0;
for (int i = 0; i < _Frames.Length; i++)
{
_Frames[i] = null;
}
for (int i = 0; i < _Heap.Length; i++)
{
_Heap[i] = null;
}
Globals.Reset();
_GrayList.Clear();
GearsObjFunction closure = new GearsObjFunction(Chunk, 0, 0, 0);
PushFrame(new GearsCallFrame(closure));
Push(GearsValue.CreateObjPtr(HeapAddObject(closure)));
AddNativeFunctionToGlobals("clock", 0, NativeFnClock);
AddNativeFunctionToGlobals("print", 1, NativeFnPrint);
if (firstRun)
{
Run();
}
return(this);
}
private int DisassembleConstant(string name, GearsChunk chunk, int offset, EGearsOpCode constantType, Action <string> writeLine)
{
int constantIndex = (chunk.ReadCode(ref offset) << 8) + chunk.ReadCode(ref offset);
switch (constantType)
{
case OP_LOAD_CONSTANT: {
GearsValue value = chunk.ReadConstantValue(constantIndex);
writeLine($"{name} const[{constantIndex}] ({value})");
}
break;
case OP_LOAD_STRING: {
string value = chunk.Strings.ReadStringConstant(constantIndex);
writeLine($"{name} string[{constantIndex}] ({value})");
}
break;
case OP_LOAD_FUNCTION: {
string value = chunk.ReadConstantValueAsBitStr(constantIndex);
writeLine($"{name} bitstr[{constantIndex}] ({value})");
}
break;
}
return(offset);
}
internal void StackSet(int index, GearsValue value)
{
if (index < 0 || index >= _SP)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Stack exception");
}
_Stack[index] = value;
}
public bool TryGet(ulong key, out GearsValue value)
{
if (_Table.TryGetValue(key, out value))
{
return(true);
}
return(false);
}
internal void Push(GearsValue value)
{
if (_SP >= STACK_MAX)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Stack exception");
}
_Stack[_SP++] = value;
}
public void MarkValue(GearsValue value)
{
// we don't need to collect value types, as they require no heap allocation.
if (!value.IsObjPtr)
{
return;
}
MarkObject(value.AsObject(this));
}
// === Functions =============================================================================================
// ===========================================================================================================
private void DefineMethod()
{
ulong methodName = (ulong)ReadConstant();
GearsValue methodPtr = Peek();
GearsObjFunction method = GetObjectFromPtr <GearsObjFunction>(methodPtr);
GearsObjClass objClass = GetObjectFromPtr <GearsObjClass>(Peek(1));
objClass.Methods.Set(methodName, methodPtr);
Pop();
}
private bool BindLoxMethod(GearsObjClass classObj, ulong name)
{
if (!classObj.Methods.TryGet(name, out GearsValue method))
{
return(false);
}
int objPtr = HeapAddObject(new GearsObjBoundMethod(Peek(), HeapGetObject(method.AsObjPtr) as GearsObjFunction));
Pop();
Push(GearsValue.CreateObjPtr(objPtr));
return(true);
}
private T GetObjectFromPtr <T>(GearsValue ptr) where T : GearsObj
{
if (!ptr.IsObjPtr)
{
throw new Exception($"GetObjectFromPtr: Value is not a pointer and cannot reference a {typeof(T).Name}.");
}
GearsObj obj = HeapGetObject(ptr.AsObjPtr);
if (obj is T)
{
return(obj as T);
}
throw new Exception($"GetObjectFromPtr: Object is not {typeof(T).Name}.");
}
private GearsValue AreValuesEqual(GearsValue a, GearsValue b)
{
if (a.IsBool && b.IsBool)
{
return(a.AsBool == b.AsBool);
}
else if (a.IsNil && b.IsNil)
{
return(true);
}
else if (a.IsNumber && b.IsNumber)
{
return(a.Equals(b));
}
return(false);
}
public bool TryGetField(Gears vm, object wrappedObject, ulong name, out GearsValue value)
{
if (_Fields.TryGetValue(name, out FieldInfo fieldInfo))
{
if (IsNumeric(fieldInfo.FieldType))
{
double fieldValue = Convert.ToDouble(fieldInfo.GetValue(wrappedObject));
value = new GearsValue(fieldValue);
return(true);
}
else if (fieldInfo.FieldType == typeof(bool))
{
bool fieldValue = Convert.ToBoolean(fieldInfo.GetValue(wrappedObject));
value = fieldValue ? GearsValue.TrueValue : GearsValue.FalseValue;
return(true);
}
else if (fieldInfo.FieldType == typeof(string))
{
if (!(fieldInfo.GetValue(wrappedObject) is string fieldValue))
{
value = GearsValue.NilValue;
}
else
{
value = GearsValue.CreateObjPtr(vm.HeapAddObject(new GearsObjString(fieldValue)));
}
return(true);
}
else if (fieldInfo.FieldType.IsSubclassOf(typeof(object)))
{
if (!(fieldInfo.GetValue(wrappedObject) is object wrappedFieldObject))
{
value = GearsValue.NilValue;
}
else
{
value = GearsValue.CreateObjPtr(vm.HeapAddObject(new GearsObjInstanceNative(vm, wrappedFieldObject)));
}
return(true);
}
private void InvokeFromClass(int argCount, ulong methodName, GearsValue receiverPtr, GearsObjClass objClass)
{
if (!objClass.Methods.TryGet(methodName, out GearsValue methodPtr))
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"{objClass} has no method with name '{BitString.GetBitStr(methodName)}'.");
}
if ((!methodPtr.IsObjPtr) || !(HeapGetObject(methodPtr.AsObjPtr) is GearsObjFunction method))
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"Could not resolve method '{BitString.GetBitStr(methodName)}' in class {objClass}.");
}
if (method.Arity != argCount)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"{method} expects {method.Arity} arguments but was passed {argCount}.");
}
int ip = method.IP;
int bp = _SP - (method.Arity + 1);
if (!receiverPtr.IsNil)
{
StackSet(bp, receiverPtr); // todo: this wipes out the method object. Is this bad?
}
PushFrame(new GearsCallFrame(method, ip, bp));
}
/// <summary>
/// Defines a function that can be called by scripts.
/// Arity is the number of arguments expected.
/// </summary>
internal void AddNativeFunctionToGlobals(string name, int arity, GearsFunctionNativeDelegate onInvoke)
{
Globals.Set(BitString.GetBitStr(name), GearsValue.CreateObjPtr(HeapAddObject(new GearsObjFunctionNative(name, arity, onInvoke))));
}
private bool IsFalsey(GearsValue value)
{
return(value.IsNil || (value.IsBool && !value.AsBool));
}
/// <summary>
/// Runs the script from top to bottom.
/// </summary>
private bool RunOne()
{
LastReturnValue = GearsValue.NilValue;
while (true)
{
EGearsOpCode instruction = (EGearsOpCode)ReadByte();
switch (instruction)
{
case OP_LOAD_CONSTANT:
Push(ReadConstant());
break;
case OP_LOAD_STRING:
Push(GearsValue.CreateObjPtr(HeapAddObject(new GearsObjString(ReadConstantString()))));
break;
case OP_LOAD_FUNCTION: {
int arity = ReadByte();
int address = ReadShort();
int upvalueCount = ReadByte();
GearsObjFunction closure = new GearsObjFunction(Chunk, arity, upvalueCount, address);
for (int i = 0; i < upvalueCount; i++)
{
bool isLocal = ReadByte() == 1;
int index = ReadByte();
if (isLocal)
{
int location = _OpenFrame.BP + index;
closure.Upvalues[i] = CaptureUpvalue(location);
}
else
{
closure.Upvalues[i] = _OpenFrame.Function.Upvalues[index];
}
}
Push(GearsValue.CreateObjPtr(HeapAddObject(closure)));
}
break;
case OP_NIL:
Push(GearsValue.NilValue);
break;
case OP_TRUE:
Push(GearsValue.TrueValue);
break;
case OP_FALSE:
Push(GearsValue.FalseValue);
break;
case OP_POP:
Pop();
break;
case OP_GET_LOCAL: {
int slot = ReadShort();
Push(StackGet(slot + _BP));
}
break;
case OP_SET_LOCAL: {
int slot = ReadShort();
StackSet(slot + _BP, Peek());
}
break;
case OP_GET_GLOBAL: {
ulong name = (ulong)ReadConstant();
if (!Globals.TryGet(name, out GearsValue value))
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"Undefined variable '{BitString.GetBitStr(name)}'.");
}
Push(value);
}
break;
case OP_DEFINE_GLOBAL: {
ulong name = (ulong)ReadConstant();
Globals.Set(name, Peek());
Pop();
}
break;
case OP_SET_GLOBAL: {
ulong name = (ulong)ReadConstant();
if (!Globals.ContainsKey(name))
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"Undefined variable '{BitString.GetBitStr(name)}'.");
}
Globals.Set(name, Peek());
break;
}
case OP_GET_UPVALUE: {
int slot = ReadShort();
GearsObjUpvalue upvalue = _OpenFrame.Function.Upvalues[slot];
if (upvalue.IsClosed)
{
Push(upvalue.Value);
}
else
{
Push(StackGet(upvalue.OriginalSP));
}
}
break;
case OP_SET_UPVALUE: {
int slot = ReadShort();
GearsObjUpvalue upvalue = _OpenFrame.Function.Upvalues[slot];
if (upvalue.IsClosed)
{
upvalue.Value = Peek();
}
else
{
StackSet(upvalue.OriginalSP, Peek());
}
}
break;
case OP_GET_PROPERTY: {
GearsObjInstance instance = GetObjectFromPtr <GearsObjInstance>(Peek());
ulong name = (ulong)ReadConstant(); // property name
if (instance.TryGetField(name, out GearsValue value))
{
Pop(); // instance
Push(value); // property value
break;
}
if (instance is GearsObjInstanceLox loxInstance && BindLoxMethod(loxInstance.Class, name))
{
break;
}
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"Undefined property or method '{name}'.");
}
case OP_SET_PROPERTY: {
GearsObjInstance instance = GetObjectFromPtr <GearsObjInstance>(Peek(1));
ulong name = (ulong)ReadConstant(); // property name
GearsValue value = Pop(); // value
instance.SetField(name, value);
Pop(); // ptr
Push(value); // value
}
break;
case OP_GET_SUPER: {
ulong name = (ulong)ReadConstant(); // method/property name
GearsObjClass superclass = GetObjectFromPtr <GearsObjClass>(Pop());
if (!BindLoxMethod(superclass, name))
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"Could not get {name} in superclass {superclass}");
}
}
break;
case OP_EQUAL:
Push(AreValuesEqual(Pop(), Pop()));
break;
case OP_GREATER: {
if (!Peek(0).IsNumber || !Peek(1).IsNumber)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Operands must be numbers.");
}
GearsValue b = Pop();
GearsValue a = Pop();
Push(a > b);
}
break;
case OP_LESS: {
if (!Peek(0).IsNumber || !Peek(1).IsNumber)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Operands must be numbers.");
}
GearsValue b = Pop();
GearsValue a = Pop();
Push(a < b);
}
break;
case OP_BITWISE_AND: {
if (!Peek(0).IsNumber || !Peek(1).IsNumber)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Operands of bitwise operators must be numbers.");
}
GearsValue b = Pop();
GearsValue a = Pop();
Push((long)((double)a) & (long)((double)b));
}
break;
case OP_BITWISE_OR: {
if (!Peek(0).IsNumber || !Peek(1).IsNumber)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Operands of bitwise operators must be numbers.");
}
GearsValue b = Pop();
GearsValue a = Pop();
Push((long)((double)a) | (long)((double)b));
}
break;
case OP_ADD: {
GearsValue b = Pop();
GearsValue a = Pop();
if (a.IsNumber && b.IsNumber)
{
Push(a + b);
}
else if (a.IsObjType <GearsObjString>(this) && b.IsObjType <GearsObjString>(this))
{
string sa = GetObjectFromPtr <GearsObjString>(a).Value;
string sb = GetObjectFromPtr <GearsObjString>(b).Value;
Push(GearsValue.CreateObjPtr(HeapAddObject(new GearsObjString(sa + sb))));
}
else
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Operands of add must be numbers or strings.");
}
}
break;
case OP_SUBTRACT: {
if (!Peek(0).IsNumber || !Peek(1).IsNumber)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Operands of subtract must be numbers.");
}
GearsValue b = Pop();
GearsValue a = Pop();
Push(a - b);
}
break;
case OP_MULTIPLY: {
if (!Peek(0).IsNumber || !Peek(1).IsNumber)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Operands of multiply must be numbers.");
}
GearsValue b = Pop();
GearsValue a = Pop();
Push(a * b);
}
break;
case OP_DIVIDE: {
if (!Peek(0).IsNumber || !Peek(1).IsNumber)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Operands of divide must be numbers.");
}
GearsValue b = Pop();
GearsValue a = Pop();
Push(a / b);
}
break;
case OP_NOT:
Push(IsFalsey(Pop()));
break;
case OP_NEGATE: {
if (!Peek(0).IsNumber)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Operand of negate must be a number.");
}
Push(-Pop());
}
break;
case OP_JUMP: {
int offset = ReadShort();
ModIP(offset);
}
break;
case OP_JUMP_IF_FALSE: {
int offset = ReadShort();
if (IsFalsey(Peek()))
{
ModIP(offset);
}
}
break;
case OP_LOOP: {
int offset = ReadShort();
ModIP(-offset);
}
break;
case OP_CALL: {
Call(argCount: ReadByte());
}
break;
case OP_INVOKE: {
CallInvoke();
}
break;
case OP_SUPER_INVOKE: {
CallInvokeSuper();
}
break;
case OP_CLOSE_UPVALUE:
CloseUpvalues(_SP - 1);
Pop();
break;
case OP_RETURN: {
GearsValue result = Pop();
CloseUpvalues(_OpenFrame.BP);
if (PopFrame())
{
if (_SP != 0)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"Error after final return: SP is '{_SP}', not '0'.");
}
LastReturnValue = result;
_IP = Chunk.SizeCode; // code is complete and no longer running.
return(true);
}
Push(result);
}
break;
case OP_CLASS: {
Push(GearsValue.CreateObjPtr(HeapAddObject(new GearsObjClass(ReadConstantString()))));
}
break;
case OP_INHERIT: {
if (!Peek(0).IsObjType <GearsObjClass>(this))
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Superclass is not a class.");
}
GearsObjClass super = GetObjectFromPtr <GearsObjClass>(Peek(1));
GearsObjClass sub = GetObjectFromPtr <GearsObjClass>(Peek(0));
foreach (ulong key in super.Methods.AllKeys)
{
if (!super.Methods.TryGet(key, out GearsValue methodPtr))
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Could not copy superclass method table.");
}
sub.Methods.Set(key, methodPtr);
}
Pop(); // pop subclass
}
break;
case OP_METHOD: {
DefineMethod();
}
break;
default:
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"Unknown opcode {instruction}");
}
}
}
public void SetField(Gears context, object wrappedObject, ulong name, GearsValue value)
{
if (_Fields.TryGetValue(name, out FieldInfo fieldInfo))
{
if (value.IsNumber)
{
if (!IsNumeric(fieldInfo.FieldType))
{
throw new GearsRuntimeException($"Attempted to set {WrappedType.Name}.{fieldInfo.Name} to numeric value.");
}
try {
fieldInfo.SetValue(wrappedObject, Convert.ChangeType((double)value, fieldInfo.FieldType));
return;
}
catch (Exception e) {
throw new GearsRuntimeException($"Error setting {WrappedType.Name}.{fieldInfo.Name} to {(double)value}: {e.Message}");
}
}
else if (value.IsNil && fieldInfo.FieldType == typeof(string))
{
fieldInfo.SetValue(wrappedObject, null);
return;
}
else if (fieldInfo.FieldType == typeof(bool) && value.IsBool)
{
fieldInfo.SetValue(wrappedObject, value.IsTrue);
return;
}
else if (value.IsObjPtr)
{
GearsObj obj = value.AsObject(context);
if (fieldInfo.FieldType == typeof(string) && obj is GearsObjString objString)
{
fieldInfo.SetValue(wrappedObject, objString.Value);
return;
}
}
}
else if (_Properties.TryGetValue(name, out PropertyInfo propertyInfo))
{
if (!propertyInfo.GetSetMethod().IsPublic)
{
throw new GearsRuntimeException($"Unsupported reference: Native class {WrappedType.Name} does not have a public set method for '{BitString.GetBitStr(name)}'.");
}
if (value.IsNumber)
{
if (!IsNumeric(propertyInfo.PropertyType))
{
throw new GearsRuntimeException($"Attempted to set {WrappedType.Name}.{propertyInfo.Name} to numeric value.");
}
try {
propertyInfo.SetValue(wrappedObject, Convert.ChangeType((double)value, propertyInfo.PropertyType), null);
return;
}
catch (Exception e) {
throw new GearsRuntimeException($"Error setting {WrappedType.Name}.{propertyInfo.Name} to {(double)value}: {e.Message}");
}
}
else if (value.IsNil && propertyInfo.PropertyType == typeof(string))
{
propertyInfo.SetValue(wrappedObject, null, null);
return;
}
else if (propertyInfo.PropertyType == typeof(bool) && value.IsBool)
{
propertyInfo.SetValue(wrappedObject, value.IsTrue, null);
return;
}
else if (value.IsObjPtr)
{
GearsObj obj = value.AsObject(context);
if (propertyInfo.PropertyType == typeof(string) && obj is GearsObjString objString)
{
propertyInfo.SetValue(wrappedObject, objString.Value, null);
return;
}
}
}
throw new GearsRuntimeException($"Unsupported native conversion: Error setting {WrappedType.Name}.{BitString.GetBitStr(name)} to {value}.");
}
internal void AddNativeObjectToGlobals(string name, object obj)
{
Globals.Set(BitString.GetBitStr(name), GearsValue.CreateObjPtr(HeapAddObject(new GearsObjInstanceNative(this, obj))));
}
internal bool CallGearsFunction(ulong name, out object returned, params object[] args)
{
if (!Globals.TryGet(name, out GearsValue fnValue) || !fnValue.IsObjPtr)
{
// error: no function with that name.
returned = $"Error: no function with name '{BitString.GetBitStr(name)}'.";
return(false);
}
GearsObj fnObject = fnValue.AsObject(this);
if (fnObject is GearsObjFunction fnFunction)
{
if (fnFunction.Arity != args.Length)
{
// error: wrong arity.
returned = $"Error: called '{BitString.GetBitStr(name)}' with wrong arity (passed arity is '{args?.Length ?? 0}').";
return(false);
}
}
Push(fnValue);
for (int i = 0; i < (args?.Length ?? 0); i++)
{
object arg = args[i];
Type argType = arg?.GetType() ?? null;
if (arg == null)
{
Push(GearsValue.NilValue);
}
else if (GearsNativeWrapper.IsNumeric(argType))
{
double fieldValue = Convert.ToDouble(arg);
Push(new GearsValue(fieldValue));
}
else if (argType == typeof(bool))
{
bool fieldValue = Convert.ToBoolean(arg);
Push(fieldValue ? GearsValue.TrueValue : GearsValue.FalseValue);
}
else if (argType == typeof(string))
{
string fieldValue = Convert.ToString(arg);
if (fieldValue == null)
{
Push(GearsValue.NilValue);
}
else
{
Push(GearsValue.CreateObjPtr(HeapAddObject(new GearsObjString(fieldValue))));
}
}
else if (argType.IsSubclassOf(typeof(object)))
{
if (arg == null)
{
Push(GearsValue.NilValue);
}
else
{
Push(GearsValue.CreateObjPtr(HeapAddObject(new GearsObjInstanceNative(this, arg))));
}
}
else
{
// error: could not pass arg of this type
returned = $"Error: called '{BitString.GetBitStr(name)}' with argument of type '{argType.Name}' as parameter {i}. Gears could not interpret this argument.";
return(false);
}
}
Call(args?.Length ?? 0);
Run();
returned = LastReturnValue; // the return value
// todo: process return value?
return(true);
}
private void Call(int argCount)
{
GearsValue ptr = Peek(argCount);
if (!ptr.IsObjPtr)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Attempted call to non-pointer.");
}
GearsObj obj = HeapGetObject(ptr.AsObjPtr);
if (obj is GearsObjFunction function)
{
if (function.Arity != argCount)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"{function} expects {function.Arity} arguments but was passed {argCount}.");
}
int ip = function.IP;
int bp = _SP - (function.Arity + 1);
PushFrame(new GearsCallFrame(function, ip, bp));
}
else if (obj is GearsObjFunctionNative native)
{
if (native.Arity != argCount)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"{native} expects {native.Arity} arguments but was passed {argCount}.");
}
GearsValue[] args = new GearsValue[argCount];
for (int i = argCount - 1; i >= 0; i--)
{
args[i] = Pop();
}
Pop(); // pop the function signature
Push(native.Invoke(args));
}
else if (obj is GearsObjBoundMethod method)
{
if (method.Method.Arity != argCount)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"{method} expects {method.Method.Arity} arguments but was passed {argCount}.");
}
int ip = method.Method.IP;
int bp = _SP - (method.Method.Arity + 1);
StackSet(bp, method.Receiver); // todo: this wipes out the method object. Is this bad?
PushFrame(new GearsCallFrame(method.Method, ip, bp));
}
else if (obj is GearsObjClass classObj)
{
StackSet(_SP - argCount - 1, GearsValue.CreateObjPtr(HeapAddObject(new GearsObjInstanceLox(classObj))));
if (classObj.Methods.TryGet(InitString, out GearsValue initPtr))
{
if (!initPtr.IsObjPtr)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Attempted call to non-pointer.");
}
GearsObjFunction initFn = HeapGetObject(initPtr.AsObjPtr) as GearsObjFunction;
PushFrame(new GearsCallFrame(initFn, initFn.IP, _SP - argCount - 1));
}
}
else
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"Unhandled call to object {obj}");
}
}
// --- Can probably merge a ton of code from the three call methods ---
private void CallInvoke()
{
int argCount = ReadByte();
ulong methodName = (ulong)ReadConstant();
GearsValue receiverPtr = Peek(argCount);
if (!receiverPtr.IsObjPtr)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Attempted invoke to non-pointer.");
}
GearsObj obj = receiverPtr.AsObject(this);
if (obj is GearsObjInstance instance)
{
if (instance.TryGetField(methodName, out GearsValue value))
{
if (!value.IsObjPtr)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Attempted call to non-pointer.");
}
GearsObj objFn = HeapGetObject(value.AsObjPtr);
if (objFn is GearsObjFunction function)
{
if (function.Arity != argCount)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"{function} expects {function.Arity} arguments but was passed {argCount}.");
}
int ip = function.IP;
int bp = _SP - (function.Arity + 1);
PushFrame(new GearsCallFrame(function, ip, bp));
}
else if (objFn is GearsObjFunctionNative native)
{
if (native.Arity != argCount)
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"{native} expects {native.Arity} arguments but was passed {argCount}.");
}
GearsValue[] args = new GearsValue[argCount];
for (int i = argCount - 1; i >= 0; i--)
{
args[i] = Pop();
}
Pop(); // pop the function signature
Push(native.Invoke(args));
}
else
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"Could not resolve method {methodName} in {instance}.");
}
}
else if (instance is GearsObjInstanceLox instanceLox)
{
InvokeFromClass(argCount, methodName, receiverPtr, instanceLox.Class);
}
else
{
throw new GearsRuntimeException(Chunk.LineAt(_IP), $"{instance} does not have a public method named '{BitString.GetBitStr(methodName)}'.");
}
return;
}
throw new GearsRuntimeException(Chunk.LineAt(_IP), "Attempted invoke to non-instance.");
}