public static void Emit(byte[] instruction, CompilationContext context)
{
// 300R0000 VVVVVVVV
// R: Register to use as loop counter.
// V: Number of iterations to loop.
// 310R0000
byte mode = instruction[StartOrEndIndex];
byte iterationRegisterIndex = instruction[IterationRegisterIndex];
switch (mode)
{
case LoopBegin:
// Just start a new compilation block and parse the instruction itself at the end.
context.BlockStack.Push(new OperationBlock(instruction));
return;
case LoopEnd:
break;
default:
throw new TamperCompilationException($"Invalid loop {mode} in Atmosphere cheat");
}
// Use the loop begin instruction stored in the stack.
instruction = context.CurrentBlock.BaseInstruction;
CodeType codeType = InstructionHelper.GetCodeType(instruction);
if (codeType != CodeType.StartEndLoop)
{
throw new TamperCompilationException($"Loop end does not match code type {codeType} in Atmosphere cheat");
}
// Validate if the register in the beginning and end are the same.
byte oldIterationRegisterIndex = instruction[IterationRegisterIndex];
if (iterationRegisterIndex != oldIterationRegisterIndex)
{
throw new TamperCompilationException($"The register used for the loop changed from {oldIterationRegisterIndex} to {iterationRegisterIndex} in Atmosphere cheat");
}
Register iterationRegister = context.GetRegister(iterationRegisterIndex);
ulong immediate = InstructionHelper.GetImmediate(instruction, IterationsImmediateIndex, IterationsImmediateSize);
// Create a loop block with the current operations and nest it in the upper
// block of the stack.
ForBlock block = new ForBlock(immediate, iterationRegister, context.CurrentOperations);
context.BlockStack.Pop();
context.CurrentOperations.Add(block);
}
public static void Emit(byte[] instruction, CompilationContext context)
{
// 20000000
// Use the conditional begin instruction stored in the stack.
instruction = context.CurrentBlock.BaseInstruction;
CodeType codeType = InstructionHelper.GetCodeType(instruction);
// Pop the current block of operations from the stack so control instructions
// for the conditional can be emitted in the upper block.
IEnumerable <IOperation> operations = context.CurrentOperations;
context.BlockStack.Pop();
ICondition condition;
switch (codeType)
{
case CodeType.BeginMemoryConditionalBlock:
condition = MemoryConditional.Emit(instruction, context);
break;
case CodeType.BeginKeypressConditionalBlock:
condition = KeyPressConditional.Emit(instruction, context);
break;
case CodeType.BeginRegisterConditionalBlock:
condition = RegisterConditional.Emit(instruction, context);
break;
default:
throw new TamperCompilationException($"Conditional end does not match code type {codeType} in Atmosphere cheat");
}
// Create a conditional block with the current operations and nest it in the upper
// block of the stack.
IfBlock block = new IfBlock(condition, operations);
context.CurrentOperations.Add(block);
}
private static void Emit(byte[] instruction, CompilationContext context, IEnumerable <IOperation> operationsElse)
{
// 2X000000
// X: End type (0 = End, 1 = Else).
byte terminationType = instruction[TerminationTypeIndex];
switch (terminationType)
{
case End:
break;
case Else:
// Start a new operation block with the 'else' instruction to signal that there is the 'then' block just above it.
context.BlockStack.Push(new OperationBlock(instruction));
return;
default:
throw new TamperCompilationException($"Unknown conditional termination type {terminationType}");
}
// Use the conditional begin instruction stored in the stack.
var upperInstruction = context.CurrentBlock.BaseInstruction;
CodeType codeType = InstructionHelper.GetCodeType(upperInstruction);
// Pop the current block of operations from the stack so control instructions
// for the conditional can be emitted in the upper block.
IEnumerable <IOperation> operations = context.CurrentOperations;
context.BlockStack.Pop();
// If the else operations are already set, then the upper block must not be another end.
if (operationsElse != null && codeType == CodeType.EndConditionalBlock)
{
throw new TamperCompilationException($"Expected an upper 'if' conditional instead of 'end conditional'");
}
ICondition condition;
switch (codeType)
{
case CodeType.BeginMemoryConditionalBlock:
condition = MemoryConditional.Emit(upperInstruction, context);
break;
case CodeType.BeginKeypressConditionalBlock:
condition = KeyPressConditional.Emit(upperInstruction, context);
break;
case CodeType.BeginRegisterConditionalBlock:
condition = RegisterConditional.Emit(upperInstruction, context);
break;
case CodeType.EndConditionalBlock:
terminationType = upperInstruction[TerminationTypeIndex];
// If there is an end instruction above then it must be an else.
if (terminationType != Else)
{
throw new TamperCompilationException($"Expected an upper 'else' conditional instead of {terminationType}");
}
// Re-run the Emit with the else operations set.
Emit(instruction, context, operations);
return;
default:
throw new TamperCompilationException($"Conditional end does not match code type {codeType} in Atmosphere cheat");
}
// Create a conditional block with the current operations and nest it in the upper
// block of the stack.
IfBlock block = new IfBlock(condition, operations, operationsElse);
context.CurrentOperations.Add(block);
}