private static unsafe Jsm.ExecutableSegment MakeScript(Operation *operation, UInt16 count)
{
List <JsmInstruction> instructions = new List <JsmInstruction>(count / 2);
LabeledStack stack = new LabeledStack();
LabelBuilder labelBuilder = new LabelBuilder(count);
for (Int32 i = 0; i < count; i++)
{
Jsm.Opcode opcode = operation->Opcode;
Int32 parameter = operation->Parameter;
operation++;
stack.CurrentLabel = i;
IJsmExpression expression = Jsm.Expression.TryMake(opcode, parameter, stack);
if (expression != null)
{
stack.Push(expression);
continue;
}
JsmInstruction instruction = JsmInstruction.TryMake(opcode, parameter, stack);
if (instruction != null)
{
labelBuilder.TraceInstruction(i, stack.CurrentLabel, new IndexedInstruction(instructions.Count, instruction));
instructions.Add(instruction);
continue;
}
throw new NotSupportedException(opcode.ToString());
}
if (stack.Count != 0)
{
throw new InvalidProgramException("Stack unbalanced.");
}
if (!(instructions.First() is LBL))
{
throw new InvalidProgramException("Script must start with a label.");
}
if (!(instructions.Last() is IRET))
{
throw new InvalidProgramException("Script must end with a return.");
}
// Switch from opcodes to instructions
HashSet <Int32> labelIndices = labelBuilder.Commit();
// Merge similar instructions
instructions = InstructionMerger.Merge(instructions, labelIndices);
// Combine instructions to logical blocks
IReadOnlyList <Jsm.IJsmControl> controls = Jsm.Control.Builder.Build(instructions);
// Arrange instructions by segments and return root
return(Jsm.Segment.Builder.Build(instructions, controls));
}
public static JsmInstruction TryMake(Jsm.Opcode opcode, Int32 parameter, IStack <IJsmExpression> stack)
{
if (Factories.TryGetValue(opcode, out var make))
{
return(make(parameter, stack));
}
return(null);
}
private static IJsmExpression TryMakeInternal(Jsm.Opcode opcode, int param, IStack <IJsmExpression> stack)
{
switch (opcode)
{
case Jsm.Opcode.PSHN_L:
return(new PSHN_L(param));
case Jsm.Opcode.PSHAC:
return(new PSHAC(new Jsm.FieldObjectId(param)));
case Jsm.Opcode.PSHI_L:
return(new PSHI_L(new ScriptResultId(param)));
case Jsm.Opcode.PSHM_B:
return(new PSHM_B(new GlobalVariableId <byte>(param)));
case Jsm.Opcode.PSHM_W:
return(new PSHM_W(new GlobalVariableId <ushort>(param)));
case Jsm.Opcode.PSHM_L:
return(new PSHM_L(new GlobalVariableId <uint>(param)));
case Jsm.Opcode.PSHSM_B:
return(new PSHSM_B(new GlobalVariableId <sbyte>(param)));
case Jsm.Opcode.PSHSM_W:
return(new PSHSM_W(new GlobalVariableId <short>(param)));
case Jsm.Opcode.PSHSM_L:
return(new PSHSM_L(new GlobalVariableId <int>(param)));
case Jsm.Opcode.CAL:
return(CAL.Read(param, stack));
//case Opcode.MovieReady:
// return new Instruction.MovieReady(stack.Pop(), stack.Pop());
}
return(null);
}
private static IJsmExpression TryMakeInternal(Jsm.Opcode opcode, Int32 param, IStack <IJsmExpression> stack)
{
switch (opcode)
{
case Jsm.Opcode.PSHN_L:
return(new PSHN_L(param));
case Jsm.Opcode.PSHAC:
return(new PSHAC(new Jsm.FieldObjectId(param)));
case Jsm.Opcode.PSHI_L:
return(new PSHI_L(new ScriptResultId(param)));
case Jsm.Opcode.PSHM_B:
return(new PSHM_B(new GlobalVariableId <Byte>(param)));
case Jsm.Opcode.PSHM_W:
return(new PSHM_W(new GlobalVariableId <UInt16>(param)));
case Jsm.Opcode.PSHM_L:
return(new PSHM_L(new GlobalVariableId <UInt32>(param)));
case Jsm.Opcode.PSHSM_B:
return(new PSHSM_B(new GlobalVariableId <SByte>(param)));
case Jsm.Opcode.PSHSM_W:
return(new PSHSM_W(new GlobalVariableId <Int16>(param)));
case Jsm.Opcode.PSHSM_L:
return(new PSHSM_L(new GlobalVariableId <Int32>(param)));
case Jsm.Opcode.CAL:
return(CAL.Read(param, stack));
//case Opcode.MOVIEREADY:
// return new Instruction.MOVIEREADY(stack.Pop(), stack.Pop());
}
return(null);
}
public static IJsmExpression TryMake(Jsm.Opcode opcode, int param, IStack <IJsmExpression> stack)
{
var result = TryMakeInternal(opcode, param, stack);
return(result?.Evaluate(StatelessServices.Instance)); // Simplify the expression
}