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Avoid O(n²) array growth in GenerateTypeMappings #11127

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Merged
jonathanpeppers merged 2 commits into from
Apr 16, 2026
+3 −4
Merged

Avoid O(n²) array growth in GenerateTypeMappings #11127

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e8149d8
Use List<ITaskItem> to avoid O(n²) array growth in GenerateTypeMappings
jonathanpeppers Apr 16, 2026
1195bcb
Remove intermediate List in AddOutputTypeMaps
jonathanpeppers Apr 16, 2026
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7 changes: 3 additions & 4 deletions src/Xamarin.Android.Build.Tasks/Tasks/GenerateTypeMappings.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,7 @@ public class GenerateTypeMappings : AndroidTask
public string TypemapOutputDirectory { get; set; } = "";

AndroidRuntime androidRuntime;
readonly List<ITaskItem> generatedBinaryTypeMaps = new List<ITaskItem> ();
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public override bool RunTask ()
{
Expand All @@ -71,6 +72,7 @@ public override bool RunTask ()
if (RunCheckedBuild || useMarshalMethods)
GenerateAllTypeMappingsFromNativeState (useMarshalMethods);

GeneratedBinaryTypeMaps = generatedBinaryTypeMaps.ToArray ();
return !Log.HasLoggedErrors;
}

Expand Down Expand Up @@ -153,17 +155,14 @@ void GenerateTypeMapFromNativeState (NativeCodeGenState state, bool useMarshalMe
void AddOutputTypeMaps (TypeMapGenerator tmg, AndroidTargetArch arch)
{
string abi = MonoAndroidHelper.ArchToAbi (arch);
var items = new List<ITaskItem> ();

foreach (string file in tmg.GeneratedBinaryTypeMaps) {
var item = new TaskItem (file);
string fileName = Path.GetFileName (file);
item.SetMetadata ("DestinationSubPath", $"{abi}/{fileName}");
item.SetMetadata ("DestinationSubDirectory", $"{abi}/");
item.SetMetadata ("Abi", abi);
items.Add (item);
generatedBinaryTypeMaps.Add (item);
}

GeneratedBinaryTypeMaps = GeneratedBinaryTypeMaps.Concat (items).ToArray ();
}
}