diff --git a/src/Class/AttributeInfo/Code.zig b/src/Class/AttributeInfo/Code.zig
new file mode 100644
index 0000000..f91a8ce
--- /dev/null
+++ b/src/Class/AttributeInfo/Code.zig
@@ -0,0 +1,26 @@
+const std = @import("std");
+
+const Class = @import("../../Class.zig");
+const AttributeInfo = Class.AttributeInfo;
+const ParseError = Class.ParseError;
+
+const Instructions = @import("Instructions.zig").Instructions;
+
+max_stack: u16,
+max_locals: u16,
+code: []Instructions,
+exception_table: []ExceptionHandler,
+attributes: []AttributeInfo,
+
+const Self = @This();
+
+pub const ExceptionHandler = struct {
+    start_pc: u16,
+    end_pc: u16,
+    handler_pc: u16,
+    catch_type: u16,
+};
+
+pub fn parse(input: *std.Io.Reader, allocator: std.mem.Allocator) ParseError!Self {
+}
+
diff --git a/src/Class/AttributeInfo/Instructions.zig b/src/Class/AttributeInfo/Instructions.zig
new file mode 100644
index 0000000..b4ec6b6
--- /dev/null
+++ b/src/Class/AttributeInfo/Instructions.zig
@@ -0,0 +1,582 @@
+const std = @import("std");
+
+const InstructionSet = enum(u8) {
+    aaload = 0x32,
+    aastore = 0x53,
+    aconst_null = 0x1,
+    aload = 0x19,
+    aload_0 = 0x2a,
+    aload_1 = 0x2b,
+    aload_2 = 0x2c,
+    aload_3 = 0x2d,
+    anewarray = 0xbd,
+    areturn = 0xb0,
+    arraylength = 0xbe,
+    astore = 0x3a,
+    astore_0 = 0x4b,
+    astore_1 = 0x4c,
+    astore_2 = 0x4d,
+    astore_3 = 0x4e,
+    athrow = 0xbf,
+    baload = 0x33,
+    bastore = 0x54,
+    bipush = 0x10,
+    caload = 0x34,
+    castore = 0x55,
+    checkcast = 0xc0,
+    d2f = 0x90,
+    d2i = 0x8e,
+    d2l = 0x8f,
+    dadd = 0x63,
+    daload = 0x31,
+    dastore = 0x52,
+    dcmpg = 0x98,
+    dcmpl = 0x97,
+    dconst_0 = 0xe,
+    dconst_1 = 0xf,
+    ddiv = 0x6f,
+    dload = 0x18,
+    dload_0 = 0x26,
+    dload_1 = 0x27,
+    dload_2 = 0x28,
+    dload_3 = 0x29,
+    dmul = 0x6b,
+    dneg = 0x77,
+    drem = 0x73,
+    dreturn = 0xaf,
+    dstore = 0x39,
+    dstore_0 = 0x47,
+    dstore_1 = 0x48,
+    dstore_2 = 0x49,
+    dstore_3 = 0x4a,
+    dsub = 0x67,
+    dup = 0x59,
+    dup_x1 = 0x5a,
+    dup_x2 = 0x5b,
+    dup2 = 0x5c,
+    dup2_x1 = 0x5d,
+    dup2_x2 = 0x5e,
+    f2d = 0x8d,
+    f2i = 0x8b,
+    f2l = 0x8c,
+    fadd = 0x62,
+    faload = 0x30,
+    fastore = 0x51,
+    fcmpg = 0x96,
+    fcmpl = 0x95,
+    fconst_0 = 0xb,
+    fconst_1 = 0xc,
+    fconst_2 = 0xd,
+    fdiv = 0x6e,
+    fload = 0x17,
+    fload_0 = 0x22,
+    fload_1 = 0x23,
+    fload_2 = 0x24,
+    fload_3 = 0x25,
+    fmul = 0x6a,
+    fneg = 0x76,
+    frem = 0x72,
+    freturn = 0xae,
+    fstore = 0x38,
+    fstore_0 = 0x43,
+    fstore_1 = 0x44,
+    fstore_2 = 0x45,
+    fstore_3 = 0x46,
+    fsub = 0x66,
+    getfield = 0xb4,
+    getstatic = 0xb2,
+    goto = 0xa7,
+    goto_w = 0xc8,
+    i2b = 0x91,
+    i2c = 0x92,
+    i2d = 0x87,
+    i2f = 0x86,
+    i2l = 0x85,
+    i2s = 0x93,
+    iadd = 0x60,
+    iaload = 0x2e,
+    iand = 0x7e,
+    iastore = 0x4f,
+    iconst_m1 = 0x2,
+    iconst_0 = 0x3,
+    iconst_1 = 0x4,
+    iconst_2 = 0x5,
+    iconst_3 = 0x6,
+    iconst_4 = 0x7,
+    iconst_5 = 0x8,
+    idiv = 0x6c,
+    if_acmpeq = 0xa5,
+    if_acmpne = 0xa6,
+    if_icmpeq = 0x9f,
+    if_icmpne = 0xa0,
+    if_icmplt = 0xa1,
+    if_icmpge = 0xa2,
+    if_icmpgt = 0xa3,
+    if_icmple = 0xa4,
+    ifeq = 0x99,
+    ifne = 0x9a,
+    iflt = 0x9b,
+    ifge = 0x9c,
+    ifgt = 0x9d,
+    ifle = 0x9e,
+    ifnonnull = 0xc7,
+    ifnull = 0xc6,
+    iinc = 0x84,
+    iload = 0x15,
+    iload_0 = 0x1a,
+    iload_1 = 0x1b,
+    iload_2 = 0x1c,
+    iload_3 = 0x1d,
+    imul = 0x68,
+    ineg = 0x74,
+    instanceof = 0xc1,
+    invokedynamic = 0xba,
+    invokeinterface = 0xb9,
+    invokespecial = 0xb7,
+    invokestatic = 0xb8,
+    invokevirtual = 0xb6,
+    ior = 0x80,
+    irem = 0x70,
+    ireturn = 0xac,
+    ishl = 0x78,
+    ishr = 0x7a,
+    istore = 0x36,
+    istore_0 = 0x3b,
+    istore_1 = 0x3c,
+    istore_2 = 0x3d,
+    istore_3 = 0x3e,
+    isub = 0x64,
+    iushr = 0x7c,
+    ixor = 0x82,
+    jsr = 0xa8,
+    jsr_2 = 0xc9,
+    l2d = 0x8a,
+    l2f = 0x89,
+    l2i = 0x88,
+    ladd = 0x61,
+    laload = 0x2f,
+    land = 0x7f,
+    lastore = 0x50,
+    lcmp = 0x94,
+    lconst_0 = 0x9,
+    lconst_1 = 0xa,
+    ldc = 0x12,
+    ldc_2 = 0x13,
+    ldc2_w = 0x14,
+    ldiv = 0x6d,
+    lload = 0x16,
+    lload_0 = 0x1e,
+    lload_1 = 0x1f,
+    lload_2 = 0x20,
+    lload_3 = 0x21,
+    lmul = 0x69,
+    lneg = 0x75,
+    lookupswitch = 0xab,
+    lor = 0x81,
+    lrem = 0x71,
+    lreturn = 0xad,
+    lshl = 0x79,
+    lshr = 0x7b,
+    lstore = 0x37,
+    lstore_0 = 0x3f,
+    lstore_1 = 0x40,
+    lstore_2 = 0x41,
+    lstore_3 = 0x42,
+    lsub = 0x65,
+    lushr = 0x7d,
+    lxor = 0x83,
+    monitorenter = 0xc2,
+    monitorexit = 0xc3,
+    multianewarray = 0xc5,
+    new = 0xbb,
+    newarray = 0xbc,
+    nop = 0x0,
+    pop = 0x57,
+    pop2 = 0x58,
+    putfield = 0xb5,
+    putstatic = 0xb3,
+    ret = 0xa9,
+    @"return" = 0xb1,
+    saload = 0x35,
+    sastore = 0x56,
+    sipush = 0x11,
+    swap = 0x5f,
+    tableswitch = 0xaa,
+    wide = 0xc4,
+};
+
+const IndexU8 = struct {
+    index: u8,
+};
+
+const IndexU16 = struct {
+    index: u16,
+
+    const Self = @This();
+
+    pub fn from(b1: u8, b2: u8) Self {
+        return .{ .index = (b1 << 8) | b2 };
+    }
+};
+
+const IndexU32 = struct {
+    index: u32,
+
+    const Self = @This();
+
+    pub fn from(b1: u8, b2: u8, b3: u8, b4: u8) Self {
+        return .{ .index = (b1 << 24) | (b2 << 16) | (b3 << 8) | b4 };
+    }
+};
+
+const Byte = struct {
+    byte: u8,
+};
+
+const BranchU16 = struct {
+    branch: u16,
+
+    const Self = @This();
+
+    pub fn from(b1: u8, b2: u8) Self {
+        return .{ .index = (b1 << 8) | b2 };
+    }
+};
+
+const BranchU32 = struct {
+    branch: u32,
+
+    const Self = @This();
+
+    pub fn from(b1: u8, b2: u8, b3: u8, b4: u8) Self {
+        return .{ .branch = (b1 << 24) | (b2 << 16) | (b3 << 8) | b4 };
+    }
+};
+
+const IInc = struct {
+    index: u8,
+    @"const": u8,
+};
+
+const InvokeDynamic = struct {
+    index: u16,
+
+    const Self = @This();
+
+    pub fn from(b1: u8, b2: u8, pad1: u8, pad2: u8) Self {
+        _ = pad1;
+        _ = pad2;
+        return .{ .index = (b1 << 8) | b2 };
+    }
+};
+
+const InvokeInterface = struct {
+    index: u16,
+    count: u8,
+
+    const Self = @This();
+
+    pub fn from(b1: u8, b2: u8, count: u8, pad: u8) Self {
+        _ = pad;
+        return .{ .index = (b1 << 8) | b2, .count = count };
+    }
+};
+
+const LookupSwitch = struct {
+    default: i32,
+    pairs: []Pair,
+
+    const Pair = struct {
+        match: u32,
+        offset: i32,
+    };
+};
+
+const MultiANewArray = struct {
+    index: u16,
+    dimensions: u8,
+
+    const Self = @This();
+
+    pub fn from(b1: u8, b2: u8, dimensions: u8) Self {
+        return .{ .index = (b1 << 8) | b2, .dimensions = dimensions };
+    }
+};
+
+const NewArray = struct {
+    array_type: ArrayType,
+
+    const Self = @This();
+
+    const ArrayType = enum(u8) {
+        boolean = 4,
+        char = 5,
+        float = 6,
+        double = 7,
+        byte = 8,
+        short = 9,
+        int = 10,
+        long = 11,
+    };
+
+    pub fn from(atype: u8) Self {
+        const array_type = std.enums.fromInt(ArrayType, atype) orelse {
+            std.log.err("Invalid array type");
+            std.process.exit(1);
+        };
+        return .{ .array_type = array_type };
+    }
+};
+
+const Short = struct {
+    short: u16,
+
+    const Self = @This();
+
+    pub fn from(b1: u8, b2: u8) Self {
+        return .{ .short = (b1 << 8) | b2 };
+    }
+};
+
+const TableSwitch = struct {
+    default: i32,
+    low: i32,
+    hight: i32,
+    offsets: []i32,
+};
+
+const Wide = union {
+    form1: struct {
+        opcode: ModifiableInstruction,
+        index: u16,
+    },
+    form2: struct {
+        // Should always be iinc
+        opcode: ModifiableInstruction,
+        index: u16,
+        @"const": u16,
+    },
+
+    const Self = @This();
+
+    const ModifiableInstruction = enum(u8) {
+        iload = 0x15,
+        fload = 0x17,
+        aload = 0x19,
+        lload = 0x16,
+        dload = 0x18,
+        istore = 0x36,
+        fstore = 0x38,
+        astore = 0x3a,
+        lstore = 0x37,
+        dstore = 0x39,
+        ret = 0xa9,
+        iinc = 0x84,
+    };
+};
+
+const Instructions = union(InstructionSet) {
+    aaload,
+    aastore,
+    aconst_null,
+    aload: IndexU8,
+    aload_0,
+    aload_1,
+    aload_2,
+    aload_3,
+    anewarray: IndexU16,
+    areturn,
+    arraylength,
+    astore: IndexU8,
+    astore_0,
+    astore_1,
+    astore_2,
+    astore_3,
+    athrow,
+    baload,
+    bastore,
+    bipush: Byte,
+    caload,
+    castore,
+    checkcast: IndexU16,
+    d2f,
+    d2i,
+    d2l,
+    dadd,
+    daload,
+    dastore,
+    dcmpg,
+    dcmpl,
+    dconst_0,
+    dconst_1,
+    ddiv,
+    dload: IndexU8,
+    dload_0,
+    dload_1,
+    dload_2,
+    dload_3,
+    dmul,
+    dneg,
+    drem,
+    dreturn,
+    dstore: IndexU8,
+    dstore_0,
+    dstore_1,
+    dstore_2,
+    dstore_3,
+    dsub,
+    dup,
+    dup_x1,
+    dup_x2,
+    dup2,
+    dup2_x1,
+    dup2_x2,
+    f2d,
+    f2i,
+    f2l,
+    fadd,
+    faload,
+    fastore,
+    fcmpg,
+    fcmpl,
+    fconst_0,
+    fconst_1,
+    fconst_2,
+    fdiv,
+    fload: IndexU8,
+    fload_0,
+    fload_1,
+    fload_2,
+    fload_3,
+    fmul,
+    fneg,
+    frem,
+    freturn,
+    fstore: IndexU8,
+    fstore_0,
+    fstore_1,
+    fstore_2,
+    fstore_3,
+    fsub,
+    getfield: IndexU16,
+    getstatic: IndexU16,
+    goto: IndexU16,
+    goto_w: IndexU32,
+    i2b,
+    i2c,
+    i2d,
+    i2f,
+    i2l,
+    i2s,
+    iadd,
+    iaload,
+    iand,
+    iastore,
+    iconst_m1,
+    iconst_0,
+    iconst_1,
+    iconst_2,
+    iconst_3,
+    iconst_4,
+    iconst_5,
+    idiv,
+    if_acmpeq: BranchU16,
+    if_acmpne: BranchU16,
+    if_icmpeq: BranchU16,
+    if_icmpne: BranchU16,
+    if_icmplt: BranchU16,
+    if_icmpge: BranchU16,
+    if_icmpgt: BranchU16,
+    if_icmple: BranchU16,
+    ifeq: BranchU16,
+    ifne: BranchU16,
+    iflt: BranchU16,
+    ifge: BranchU16,
+    ifgt: BranchU16,
+    ifle: BranchU16,
+    ifnonnull: BranchU16,
+    ifnull: BranchU16,
+    iinc: IInc,
+    iload: IndexU8,
+    iload_0,
+    iload_1,
+    iload_2,
+    iload_3,
+    imul,
+    ineg,
+    instanceof: IndexU16,
+    invokedynamic: InvokeDynamic,
+    invokeinterface: InvokeInterface,
+    invokespecial: IndexU16,
+    invokestatic: IndexU16,
+    invokevirtual: IndexU16,
+    ior,
+    irem,
+    ireturn,
+    ishl,
+    ishr,
+    istore: IndexU8,
+    istore_0,
+    istore_1,
+    istore_2,
+    istore_3,
+    isub,
+    iushr,
+    ixor,
+    jsr: BranchU16,
+    jsr_w: BranchU32,
+    l2d,
+    l2f,
+    l2i,
+    ladd,
+    laload,
+    land,
+    lastore,
+    lcmp,
+    lconst_0,
+    lconst_1,
+    ldc: IndexU8,
+    ldc_w: IndexU16,
+    ldc2_w: IndexU16,
+    ldiv,
+    lload: IndexU8,
+    lload_0,
+    lload_1,
+    lload_2,
+    lload_3,
+    lmul,
+    lneg,
+    lookupswitch: LookupSwitch,
+    lor,
+    lrem,
+    lreturn,
+    lshl,
+    lshr,
+    lstore: IndexU8,
+    lstore_0,
+    lstore_1,
+    lstore_2,
+    lstore_3,
+    lsub,
+    lushr,
+    lxor,
+    monitorenter,
+    monitorexit,
+    mulitanewarray: MultiANewArray,
+    new: IndexU16,
+    newarray: NewArray,
+    nop,
+    pop,
+    pop2,
+    putfield: IndexU16,
+    putstatic: IndexU16,
+    ret: IndexU8,
+    @"return",
+    saload,
+    sastore,
+    sipush: Short,
+    swap,
+    tableswitch: TableSwitch,
+    wide: Wide,
+};
+