Implement numbered save pair lifecycle
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gamer147
256
engine/Age.Engine.Tests/NumberedSavePairTests.cs
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256
engine/Age.Engine.Tests/NumberedSavePairTests.cs
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using System.Buffers.Binary;
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using Age.Engine.Model;
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using Age.Engine.Persistence;
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using Age.Engine.Sys4;
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using Age.Engine.Vm;
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public class NumberedSavePairTests
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{
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private const int Immediate = 0;
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private const int GlobalInt = 3;
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private static readonly OpcodeTable Table = OpcodeTableJson.Load(Paths.OpcodesJson);
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private static readonly NativeSystemTime Timestamp =
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new(2026, 7, 5, 24, 13, 42, 17, 321);
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private static readonly NativeSaveIdentity Identity =
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new(NativeSaveMagic.S4SD, 0x4a343234, "numbered-test", 3, 10, 0x42323234);
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[Fact]
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public void ThumbnailCodecWritesNativeBottomUpBmpAndRoundTrips()
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{
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var image = new RgbaImage(2, 2,
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[
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255, 0, 0, 255, 0, 255, 0, 255,
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0, 0, 255, 255, 255, 255, 255, 255,
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]);
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byte[] encoded = NumberedThumbnailCodec.Encode(image);
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Assert.Equal((byte)'B', encoded[0]);
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Assert.Equal((byte)'M', encoded[1]);
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Assert.Equal(56u, BinaryPrimitives.ReadUInt32LittleEndian(encoded.AsSpan(2)));
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Assert.Equal(70, encoded.Length);
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Assert.Equal(54u, BinaryPrimitives.ReadUInt32LittleEndian(encoded.AsSpan(10)));
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Assert.Equal(2, BinaryPrimitives.ReadInt32LittleEndian(encoded.AsSpan(18)));
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Assert.Equal(2, BinaryPrimitives.ReadInt32LittleEndian(encoded.AsSpan(22)));
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Assert.Equal((ushort)24, BinaryPrimitives.ReadUInt16LittleEndian(encoded.AsSpan(28)));
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Assert.Equal(new byte[] { 255, 0, 0, 255, 255, 255 }, encoded[54..60]);
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RgbaImage decoded = NumberedThumbnailCodec.Decode(encoded);
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Assert.Equal(image.Width, decoded.Width);
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Assert.Equal(image.Height, decoded.Height);
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Assert.Equal(image.Pixels, decoded.Pixels);
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}
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[Fact]
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public void InstalledHimegariThumbnailMatchesNativeBmpDialectWhenPresent()
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{
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string eushullyRoot = Path.Combine(
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Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "Eushully");
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if (!Directory.Exists(eushullyRoot)) return;
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string? dataPath = Directory.EnumerateFiles(
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eushullyRoot, "SAVE00.DAT", SearchOption.AllDirectories)
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.FirstOrDefault(path =>
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{
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try
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{
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using var stream = File.OpenRead(path);
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byte[] header = new byte[NativeSaveContainerCodec.HeaderSize];
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stream.ReadExactly(header);
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NativeSaveMetadata metadata = NativeSaveContainerCodec.ReadMetadata(header);
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return metadata.CompatibilityId == 0x42323234
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&& metadata.SaveVersion1 == 3 && metadata.SaveVersion2 == 10;
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}
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catch (Exception ex) when (ex is IOException or InvalidDataException
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or UnauthorizedAccessException)
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{
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return false;
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}
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});
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if (dataPath == null) return;
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string thumbnailPath = Path.ChangeExtension(dataPath, ".STH");
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if (!File.Exists(thumbnailPath)) return;
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byte[] native = File.ReadAllBytes(thumbnailPath);
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RgbaImage decoded = NumberedThumbnailCodec.Decode(native);
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Assert.Equal(112, decoded.Width);
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Assert.Equal(84, decoded.Height);
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Assert.Equal(28278, native.Length);
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Assert.Equal(28264u, BinaryPrimitives.ReadUInt32LittleEndian(native.AsSpan(2)));
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Assert.Equal(54u, BinaryPrimitives.ReadUInt32LittleEndian(native.AsSpan(10)));
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Assert.Equal(native.Length, NumberedThumbnailCodec.Encode(decoded).Length);
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}
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[Fact]
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public void NumberedMetadataUsesItsOwnIdentityAndDoesNotDecodePayload()
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{
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string root = NewTempRoot();
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try
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{
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var store = new DirectoryNativeDatStore(root, Identity);
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store.SaveNumbered(4, [1, 2, 3, 4], Timestamp, 54321);
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string path = Path.Combine(root, "SAVE04.DAT");
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using (var stream = new FileStream(path, FileMode.Open, FileAccess.Write, FileShare.None))
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stream.SetLength(NativeSaveContainerCodec.HeaderSize);
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NativeSaveMetadata metadata = store.QueryNumberedMetadata(4)!;
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Assert.Equal(0x42323234u, metadata.CompatibilityId);
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Assert.Equal(Timestamp, metadata.Timestamp);
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Assert.Equal(54321u, metadata.AccumulatedPlaySeconds);
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Assert.Throws<InvalidDataException>(() => store.LoadNumbered(4));
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}
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finally
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{
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Directory.Delete(root, recursive: true);
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}
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}
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[Fact]
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public void PairOperationsAttemptBothMembersAndPreserveNativeStatusPrecedence()
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{
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string root = NewTempRoot();
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try
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{
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var store = new DirectoryNativeDatStore(root, Identity);
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store.SaveNumbered(1, [1, 2, 3, 4], Timestamp, 1);
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Assert.Equal(2, store.CopyNumberedPair(1, 2));
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Assert.NotNull(store.LoadNumbered(2));
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Assert.Null(store.LoadNumberedThumbnail(2));
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store.SaveNumberedThumbnail(3, [7, 8, 9]);
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Assert.Equal(1, store.CopyNumberedPair(3, 4));
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Assert.Null(store.LoadNumbered(4));
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Assert.Equal(new byte[] { 7, 8, 9 }, store.LoadNumberedThumbnail(4));
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Assert.Equal(2, store.DeleteNumberedPair(1));
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Assert.Equal(1, store.DeleteNumberedPair(3));
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Assert.Equal(2, store.DeleteNumberedPair(99));
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}
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finally
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{
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Directory.Delete(root, recursive: true);
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}
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}
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[Fact]
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public void VmMetadataThumbnailCopyAndDeleteOpcodesUseTheNativePairStore()
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{
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string root = NewTempRoot();
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try
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{
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var store = new DirectoryNativeDatStore(root, Identity);
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store.SaveNumbered(4, [1, 2, 3, 4], Timestamp, 54321);
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var host = new RecordingHost();
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host.SurfacePixels[7] = new RgbaImage(1, 1, [10, 20, 30, 255]);
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Script script = ScriptAssembler.Assemble(Table, "NUMBERED_SAVE_OPS",
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[
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(0x1a0, [
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G(100), I(4), G(101), G(102), G(103), G(104), G(105), G(106), G(107),
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]),
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(0x1ae, [G(110), I(4), I(7)]),
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(0x1af, [G(111), I(4), I(8)]),
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(0x1ac, [G(112), I(4), I(5)]),
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(0x1ab, [G(113), I(5)]),
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(0x2, []),
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], []);
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var vm = new VirtualMachine(script, Table, host, nativeDatStore: store);
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vm.Run();
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Assert.Equal(0, vm.Globals[100]);
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Assert.Equal(2026, vm.Globals[101]);
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Assert.Equal(7, vm.Globals[102]);
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Assert.Equal(24, vm.Globals[103]);
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Assert.Equal(13, vm.Globals[104]);
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Assert.Equal(42, vm.Globals[105]);
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Assert.Equal(17, vm.Globals[106]);
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Assert.Equal(54321, vm.Globals[107]);
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Assert.Equal(0, vm.Globals[110]);
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Assert.Equal(0, vm.Globals[111]);
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Assert.Equal(new byte[] { 10, 20, 30, 255 }, host.SurfacePixels[8].Pixels);
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Assert.Equal(0, vm.Globals[112]);
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Assert.Equal(0, vm.Globals[113]);
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Assert.Null(store.LoadNumbered(5));
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Assert.Null(store.LoadNumberedThumbnail(5));
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}
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finally
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{
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Directory.Delete(root, recursive: true);
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}
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}
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[Fact]
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public void SaveResumeMarkerSurvivesNestedReturnUntilItsOwningFrameUnwinds()
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{
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int callScript = Table.ByLabel("call-script")!.Value;
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Script child = ScriptAssembler.Assemble(Table, "CHILD",
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[
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(0x1a8, []),
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(0x2, []),
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], []);
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Script root = ScriptAssembler.Assemble(Table, "ROOT",
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[
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(0x1ad, []),
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(callScript, [I(7)]),
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(0x2, []),
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], []);
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var provider = new MapProvider(new Dictionary<long, Script> { [7] = child });
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var host = new MarkerObservingHost();
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var vm = new VirtualMachine(root, Table, host, provider: provider);
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host.Vm = vm;
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vm.Run();
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Assert.NotEmpty(host.ObservedDepths);
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Assert.All(host.ObservedDepths, depth => Assert.Equal(0, depth));
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Assert.Null(vm.SaveResumeFrameDepth);
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}
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[Fact]
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public void ChildMarkerIsClearedWhenTheChildFrameUnwinds()
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{
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int callScript = Table.ByLabel("call-script")!.Value;
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Script child = ScriptAssembler.Assemble(Table, "CHILD",
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[
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(0x1ad, []),
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(0x2, []),
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], []);
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Script root = ScriptAssembler.Assemble(Table, "ROOT",
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[
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(callScript, [I(7)]),
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(0x1a8, []),
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(0x2, []),
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], []);
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var provider = new MapProvider(new Dictionary<long, Script> { [7] = child });
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var host = new MarkerObservingHost();
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var vm = new VirtualMachine(root, Table, host, provider: provider);
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host.Vm = vm;
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vm.Run();
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Assert.Contains(1, host.ObservedDepths);
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int marked = host.ObservedDepths.FindLastIndex(depth => depth == 1);
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Assert.Contains(host.ObservedDepths.Skip(marked + 1), depth => depth == null);
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Assert.Null(vm.SaveResumeFrameDepth);
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}
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private static Operand I(long value) => new(Immediate, value);
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private static Operand G(long value) => new(GlobalInt, value);
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private static string NewTempRoot()
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{
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string root = Path.Combine(Path.GetTempPath(), "age-numbered-save-" + Guid.NewGuid().ToString("N"));
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Directory.CreateDirectory(root);
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return root;
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}
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private sealed class MarkerObservingHost : RecordingHost
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{
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public VirtualMachine Vm { get; set; } = null!;
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public List<int?> ObservedDepths { get; } = new();
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public override void FrameYield() => ObservedDepths.Add(Vm.SaveResumeFrameDepth);
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}
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}
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