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The Generator class is responsible for creating the obfuscated Lua virtual machine that executes your protected code. It handles opcode mapping, mutation generation, super operator creation, and VM code generation.

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Constructor

public Generator(ObfuscationContext context)
Initializes a new Generator instance with the given obfuscation context. Parameters:
  • context - The ObfuscationContext containing bytecode chunks, settings, and mapping information
Example: 
var context = new ObfuscationContext {
    HeadChunk = chunk,
    PrimaryXorKey = 123
};
var generator = new Generator(context);

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Core Methods

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GenerateVM

public string GenerateVM(ObfuscationSettings settings)
Generates the complete obfuscated virtual machine as Lua source code. This is the main entry point for VM generation. Parameters:
  • settings - Configuration options controlling obfuscation features:
    • Mutate - Enable instruction mutations
    • MaxMutations - Maximum number of mutations to generate
    • SuperOperators - Enable super operator optimization
    • MaxMegaSuperOperators - Maximum 60-80 instruction super operators
    • MaxMiniSuperOperators - Maximum 10 instruction super operators
    • BytecodeCompress - Enable LZW compression of bytecode
    • PreserveLineInfo - Preserve source line information for debugging
Returns: Complete Lua VM source code as a string Example: 
var settings = new ObfuscationSettings {
    Mutate = true,
    MaxMutations = 2000,
    SuperOperators = true,
    MaxMegaSuperOperators = 50,
    MaxMiniSuperOperators = 500,
    BytecodeCompress = true
};

string vmCode = generator.GenerateVM(settings);
Generation Pipeline:
  1. Opcode Discovery - Scans the bytecode and finds all used opcodes through reflection
  2. Mutation Generation (if enabled) - Creates 35-50 register-shuffled variants per opcode
  3. Mutation Folding - Maps mutations to actual instructions in the bytecode
  4. Super Operator Generation (if enabled):
    • Mega super operators: 60-80 consecutive instructions combined
    • Mini super operators: Up to 10 consecutive instructions combined
  5. Bytecode Serialization - Converts chunks to binary format
  6. Compression (if enabled) - LZW compression of bytecode string
  7. VM Assembly - Combines deserializer, decoder, and opcode dispatcher

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IsUsed

public bool IsUsed(Chunk chunk, VOpcode virt)
Recursively checks if a virtual opcode is used in the chunk or its nested functions. Parameters:
  • chunk - The bytecode chunk to scan
  • virt - The virtual opcode to check for
Returns: true if the opcode is used anywhere in the chunk hierarchy Side Effects:
  • Populates InstructionMapping in the context
  • Sets CustomData.Opcode on matching instructions

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Mutation System

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GenerateMutations

public List<OpMutated> GenerateMutations(List<VOpcode> opcodes)
Creates mutated variants of opcodes by shuffling register operands. Parameters:
  • opcodes - List of virtual opcodes to mutate
Returns: Shuffled list of mutated opcode variants (35-50 per original opcode) Note: Super operators are excluded from mutation to maintain semantic correctness.

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FoldMutations

public void FoldMutations(List<OpMutated> mutations, HashSet<OpMutated> used, Chunk chunk)
Maps mutated opcodes to actual instructions in the bytecode. Parameters:
  • mutations - Pool of available mutations
  • used - Set tracking which mutations were actually used
  • chunk - Chunk to process
Special Handling:
  • Skips instructions following Closure (upvalue pseudoinstructions)
  • Preserves control flow integrity

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Super Operator System

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GenerateSuperOperators

public List<OpSuperOperator> GenerateSuperOperators(Chunk chunk, int maxSize, int minSize = 5)
Combines sequences of consecutive instructions into single super operators. Parameters:
  • chunk - Chunk to analyze
  • maxSize - Maximum instructions per super operator
  • minSize - Minimum instructions to form a super operator (default: 5)
Returns: List of super operators found in the chunk Skipped Instructions:
  • Jump targets (instructions following jumps, branches, loops)
  • Closure upvalue pseudoinstructions
  • Instructions already part of super operators

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FoldAdditionalSuperOperators

public void FoldAdditionalSuperOperators(Chunk chunk, List<OpSuperOperator> operators, ref int folded)
Applies pre-generated super operators to additional matching instruction sequences. Parameters:
  • chunk - Chunk to process
  • operators - Super operators to match against
  • folded - Counter for number of folded instructions

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Utility Methods

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Compress

public static List<int> Compress(byte[] uncompressed)
LZW compression algorithm for bytecode data. Parameters:
  • uncompressed - Raw byte array to compress
Returns: List of LZW dictionary indices

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CompressedToString

public static string CompressedToString(List<int> compressed)
Converts compressed data to base-36 encoded string. Parameters:
  • compressed - LZW compressed data
Returns: Base-36 encoded string representation

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ToBase36

public static string ToBase36(ulong value)
Converts a number to base-36 representation (0-9, A-Z). Parameters:
  • value - Number to convert
Returns: Base-36 string

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VM Output Structure

The generated VM contains:
  1. Decoder Functions - String and number decoding utilities
  2. Decompressor (if compression enabled) - LZW decompression routine
  3. Bytecode String - Serialized chunk data (compressed or raw)
  4. Deserializer - Reconstructs chunks from bytecode
  5. Opcode Dispatcher - Binary search tree routing instructions to handlers
  6. Wrapper - Execution environment setup and invocation

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Performance Characteristics

  • Mutation Count: 35-50 variants per opcode (random)
  • Mega Super Operators: 60-80 instruction sequences
  • Mini Super Operators: 5-10 instruction sequences
  • Opcode Dispatch: Binary search O(log n) instead of linear lookup

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