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* Enable write to memory and improve logging * Update tamper machine opcodes and improve reporting * Add Else support * Add missing private statement
91 lines
3.9 KiB
C#
91 lines
3.9 KiB
C#
using Ryujinx.HLE.Exceptions;
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using Ryujinx.HLE.HOS.Tamper.Conditions;
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using Ryujinx.HLE.HOS.Tamper.Operations;
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using System.Collections.Generic;
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namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
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{
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/// <summary>
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/// Code type 2 marks the end of a conditional block (started by Code Type 1, Code Type 8 or Code Type C0).
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/// </summary>
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class EndConditionalBlock
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{
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const int TerminationTypeIndex = 1;
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private const byte End = 0; // True end of the conditional.
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private const byte Else = 1; // End of the 'then' block and beginning of 'else' block.
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public static void Emit(byte[] instruction, CompilationContext context)
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{
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Emit(instruction, context, null);
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}
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private static void Emit(byte[] instruction, CompilationContext context, IEnumerable<IOperation> operationsElse)
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{
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// 2X000000
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// X: End type (0 = End, 1 = Else).
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byte terminationType = instruction[TerminationTypeIndex];
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switch (terminationType)
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{
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case End:
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break;
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case Else:
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// Start a new operation block with the 'else' instruction to signal that there is the 'then' block just above it.
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context.BlockStack.Push(new OperationBlock(instruction));
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return;
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default:
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throw new TamperCompilationException($"Unknown conditional termination type {terminationType}");
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}
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// Use the conditional begin instruction stored in the stack.
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var upperInstruction = context.CurrentBlock.BaseInstruction;
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CodeType codeType = InstructionHelper.GetCodeType(upperInstruction);
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// Pop the current block of operations from the stack so control instructions
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// for the conditional can be emitted in the upper block.
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IEnumerable<IOperation> operations = context.CurrentOperations;
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context.BlockStack.Pop();
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// If the else operations are already set, then the upper block must not be another end.
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if (operationsElse != null && codeType == CodeType.EndConditionalBlock)
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{
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throw new TamperCompilationException($"Expected an upper 'if' conditional instead of 'end conditional'");
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}
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ICondition condition;
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switch (codeType)
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{
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case CodeType.BeginMemoryConditionalBlock:
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condition = MemoryConditional.Emit(upperInstruction, context);
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break;
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case CodeType.BeginKeypressConditionalBlock:
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condition = KeyPressConditional.Emit(upperInstruction, context);
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break;
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case CodeType.BeginRegisterConditionalBlock:
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condition = RegisterConditional.Emit(upperInstruction, context);
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break;
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case CodeType.EndConditionalBlock:
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terminationType = upperInstruction[TerminationTypeIndex];
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// If there is an end instruction above then it must be an else.
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if (terminationType != Else)
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{
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throw new TamperCompilationException($"Expected an upper 'else' conditional instead of {terminationType}");
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}
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// Re-run the Emit with the else operations set.
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Emit(instruction, context, operations);
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return;
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default:
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throw new TamperCompilationException($"Conditional end does not match code type {codeType} in Atmosphere cheat");
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}
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// Create a conditional block with the current operations and nest it in the upper
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// block of the stack.
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IfBlock block = new IfBlock(condition, operations, operationsElse);
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context.CurrentOperations.Add(block);
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}
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}
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}
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