private static bool call(ObjClosure closure, int argCount)
{
if (argCount != closure.function.arity)
{
runtimeError("Expected {0} arguments but got {1}.", closure.function.arity.ToString(), argCount.ToString());
return(false);
}
if (vm.frameCount == FRAMES_MAX)
{
runtimeError("Stack overflow.");
return(false);
}
if (vm.frameCount > 0)
{
vm.frames[vm.frameCount - 1]._ip_index = _caller_ip_index;
}
CallFrame frame = vm.frames[vm.frameCount++];
frame.closure = closure;
frame.ip = closure.function.chunk.code;
frame._ip_index = 0;
frame._ip_count = frame.closure.function.chunk.count;
frame.slots = vm.stack;
frame._slot_offset = vm.stackTop - argCount - 1;
vm.frames[vm.frameCount - 1] = frame; // Csharp ref WORK AROUND
return(true);
}
static void runtimeError(string format, params string[] args)
{
System.Console.Write(format, args);
System.Console.WriteLine();
for (int i = vm.frameCount - 1; i >= 0; i--)
{
CallFrame frame = vm.frames[i];
ObjFunction function = frame.closure.function;
int instruction = frame._ip_index - 1;
// hack fix for undefined variable crash
if (instruction < 0 || instruction >= function.chunk.lines.Length)
{
System.Console.Write("in ");
}
else
{
System.Console.Write("[line {0}] in ", function.chunk.lines[instruction].ToString());
}
if (function.name == null)
{
System.Console.WriteLine("script");
}
else
{
System.Console.WriteLine("{0}()", new string(function.name.chars, 0, function.name.chars.Length - 1));
}
}
#if DEBUG
System.Console.ReadKey(); // convenience pause
#endif
resetStack();
}
public static InterpretResult run()
{
CallFrame frame = vm.frames[vm.frameCount - 1];
frame._slot_offset = 0;
for (;;)
{
#if DEBUG_TRACE_EXECUTION
System.Console.Write(" ");
for (int slot = 0; slot < vm.stackTop; slot++)
{
System.Console.Write("[ ");
Value.printValue(vm.stack[slot]);
System.Console.Write(" ]");
}
System.Console.WriteLine();
Debug.disassembleInstruction(ref frame.closure.function.chunk, frame._ip_index);
#endif
OpCode instruction;
switch (instruction = (OpCode)READ_BYTE(ref frame))
{
case OpCode.OP_CONSTANT:
{
Value_t constant = READ_CONSTANT(ref frame);
push(constant);
break;
}
case OpCode.OP_NIL:
push(Value.NIL_VAL());
break;
case OpCode.OP_TRUE:
push(Value.BOOL_VAL(true));
break;
case OpCode.OP_FALSE:
push(Value.BOOL_VAL(false));
break;
case OpCode.OP_POP:
pop();
break;
case OpCode.OP_GET_LOCAL:
{
byte slot = READ_BYTE(ref frame);
push(frame.slots[frame._slot_offset + slot]);
break;
}
case OpCode.OP_SET_LOCAL:
{
byte slot = READ_BYTE(ref frame);
frame.slots[frame._slot_offset + slot] = peek(0);
break;
}
case OpCode.OP_GET_GLOBAL:
{
ObjString name = READ_STRING(ref frame);
Value_t value = new Value_t();
if (!Table.tableGet(ref vm.globals, name, ref value))
{
runtimeError("Undefined variable '{0}'.", new string(name.chars, 0, name.chars.Length - 1));
return(InterpretResult.INTERPRET_RUNTIME_ERROR);
}
push(value);
break;
}
case OpCode.OP_DEFINE_GLOBAL:
{
ObjString name = READ_STRING(ref frame);
Table.tableSet(ref vm.globals, name, peek(0));
pop();
break;
}
case OpCode.OP_SET_GLOBAL:
{
ObjString name = READ_STRING(ref frame);
if (Table.tableSet(ref vm.globals, name, peek(0)))
{
Table.tableDelete(ref vm.globals, name);
runtimeError("Undefined variable '{0}'.", new string(name.chars, 0, name.chars.Length - 1));
return(InterpretResult.INTERPRET_RUNTIME_ERROR);
}
break;
}
case OpCode.OP_GET_UPVALUE:
{
byte slot = READ_BYTE(ref frame);
push(frame.closure.upvalues[slot]._value_src[frame.closure.upvalues[slot].location]);
break;
}
case OpCode.OP_SET_UPVALUE:
{
byte slot = READ_BYTE(ref frame);
frame.closure.upvalues[slot]._value_src[frame.closure.upvalues[slot].location] = peek(0);
break;
}
case OpCode.OP_GET_PROPERTY:
{
if (!Object.IS_INSTANCE(peek(0)))
{
runtimeError("Only instances have properties.");
return(InterpretResult.INTERPRET_RUNTIME_ERROR);
}
ObjInstance instance = Object.AS_INSTANCE(peek(0));
ObjString name = READ_STRING(ref frame);
Value_t value = new Value_t();
if (Table.tableGet(ref instance.fields, name, ref value))
{
pop(); // Instance.
push(value);
break;
}
if (!bindMethod(instance.klass, name))
{
return(InterpretResult.INTERPRET_RUNTIME_ERROR);
}
break;
}
case OpCode.OP_SET_PROPERTY:
{
if (!Object.IS_INSTANCE(peek(1)))
{
runtimeError("Only instances have fields.");
return(InterpretResult.INTERPRET_RUNTIME_ERROR);
}
ObjInstance instance = Object.AS_INSTANCE(peek(1));
Table.tableSet(ref instance.fields, READ_STRING(ref frame), peek(0));
Value_t value = pop();
pop();
push(value);
break;
}
case OpCode.OP_GET_SUPER:
{
ObjString name = READ_STRING(ref frame);
ObjClass superclass = Object.AS_CLASS(pop());
if (!bindMethod(superclass, name))
{
return(InterpretResult.INTERPRET_RUNTIME_ERROR);
}
break;
}
case OpCode.OP_EQUAL:
{
Value_t b = pop();
Value_t a = pop();
push(Value.BOOL_VAL(Value.valuesEqual(a, b)));
break;
}
case OpCode.OP_ADD:
{
if (Object.IS_STRING(peek(0)) && Object.IS_STRING(peek(1)))
{
concatenate();
}
else if (Value.IS_NUMBER(peek(0)) && Value.IS_NUMBER(peek(1)))
{
BINARY_OP(instruction);
}
else
{
runtimeError("Operands must be two numbers or two strings.");
return(InterpretResult.INTERPRET_RUNTIME_ERROR);
}
}
break;
case OpCode.OP_GREATER:
case OpCode.OP_LESS:
case OpCode.OP_SUBTRACT:
case OpCode.OP_MULTIPLY:
case OpCode.OP_DIVIDE:
if (!BINARY_OP(instruction))
{
return(InterpretResult.INTERPRET_RUNTIME_ERROR);
}
break;
case OpCode.OP_NOT:
push(Value.BOOL_VAL(isFalsey(pop())));
break;
case OpCode.OP_NEGATE:
if (!Value.IS_NUMBER(peek(0)))
{
runtimeError("Operand must be a number.");
return(InterpretResult.INTERPRET_RUNTIME_ERROR);
}
push(Value.NUMBER_VAL(-Value.AS_NUMBER(pop())));
break;
case OpCode.OP_PRINT:
{
Value.printValue(pop());
System.Console.WriteLine();
break;
}
case OpCode.OP_JUMP:
{
ushort offset = READ_SHORT(ref frame);
frame._ip_index += offset;
break;
}
case OpCode.OP_JUMP_IF_FALSE:
{
ushort offset = READ_SHORT(ref frame);
if (isFalsey(peek(0)))
{
frame._ip_index += offset;
}
break;
}
case OpCode.OP_LOOP:
{
ushort offset = READ_SHORT(ref frame);
frame._ip_index -= offset;
break;
}
case OpCode.OP_CALL:
{
int argCount = READ_BYTE(ref frame);
_caller_ip_index = frame._ip_index;
if (!callValue(peek(argCount), argCount))
{
return(InterpretResult.INTERPRET_RUNTIME_ERROR);
}
frame = vm.frames[vm.frameCount - 1];
break;
}
case OpCode.OP_INVOKE:
{
ObjString method = READ_STRING(ref frame);
int argCount = READ_BYTE(ref frame);
_caller_ip_index = frame._ip_index;
if (!invoke(method, argCount))
{
return(InterpretResult.INTERPRET_RUNTIME_ERROR);
}
frame = vm.frames[vm.frameCount - 1];
break;
}
case OpCode.OP_SUPER_INVOKE:
{
ObjString method = READ_STRING(ref frame);
int argCount = READ_BYTE(ref frame);
ObjClass superclass = Object.AS_CLASS(pop());
_caller_ip_index = frame._ip_index;
if (!invokeFromClass(superclass, method, argCount))
{
return(InterpretResult.INTERPRET_RUNTIME_ERROR);
}
frame = vm.frames[vm.frameCount - 1];
break;
}
case OpCode.OP_CLOSURE:
{
ObjFunction function = Object.AS_FUNCTION(READ_CONSTANT(ref frame));
ObjClosure closure = Object.newClosure(function);
for (int i = 0; i < closure.upvalueCount; i++)
{
byte isLocal = READ_BYTE(ref frame);
byte index = READ_BYTE(ref frame);
if (isLocal != 0)
{
closure.upvalues[i] = captureUpvalue(frame._slot_offset + index);
}
else
{
closure.upvalues[i] = frame.closure.upvalues[index];
}
}
push(Value.OBJ_VAL(closure)); // cs push after modify?
break;
}
case OpCode.OP_CLOSE_UPVALUE:
closeUpvalues(vm.stackTop - 1);
pop();
break;
case OpCode.OP_RETURN:
{
Value_t result = pop();
closeUpvalues(frame._slot_offset);
vm.frameCount--;
if (vm.frameCount == 0)
{
pop();
return(InterpretResult.INTERPRET_OK);
}
vm.stackTop = frame._slot_offset;
push(result);
frame = vm.frames[vm.frameCount - 1];
break;
}
case OpCode.OP_CLASS:
push(Value.OBJ_VAL(Object.newClass(READ_STRING(ref frame))));
break;
case OpCode.OP_INHERIT:
{
Value_t superclass = peek(1);
if (!Object.IS_CLASS(superclass))
{
runtimeError("Superclass must be a class.");
return(InterpretResult.INTERPRET_RUNTIME_ERROR);
}
ObjClass subclass = Object.AS_CLASS(peek(0));
Table.tableAddAll(ref Object.AS_CLASS(superclass).methods, ref subclass.methods);
pop(); // Subclass.
break;
}
case OpCode.OP_METHOD:
defineMethod(READ_STRING(ref frame));
break;
}
vm.frames[vm.frameCount - 1]._ip_index = frame._ip_index; //Csharp reference updating workaround
}
}
private static ObjString READ_STRING(ref CallFrame frame)
{
return(Object.AS_STRING(READ_CONSTANT(ref frame)));
}
private static Value_t READ_CONSTANT(ref CallFrame frame)
{
return(frame.closure.function.chunk.constants.values[READ_BYTE(ref frame)]);
}
private static ushort READ_SHORT(ref CallFrame frame)
{
frame._ip_index += 2;
return((ushort)((frame.ip[frame._ip_index - 2] << 8) | frame.ip[frame._ip_index - 1]));
}
private static byte READ_BYTE(ref CallFrame frame)
{
return(frame.ip[frame._ip_index++]);
}