private static async Task<ImmutableDictionary<DiagnosticAnalyzer, SemaphoreSlim>> GetAnalyzerGateMapAsync(
ImmutableArray<DiagnosticAnalyzer> analyzers,
AnalyzerManager analyzerManager,
AnalyzerExecutor analyzerExecutor)
{
var builder = ImmutableDictionary.CreateBuilder<DiagnosticAnalyzer, SemaphoreSlim>();
foreach (var analyzer in analyzers)
{
var isConcurrent = await analyzerManager.IsConcurrentAnalyzerAsync(analyzer, analyzerExecutor).ConfigureAwait(false);
if (!isConcurrent)
{
// Non-concurrent analyzers need their action callbacks from the analyzer driver to be guarded by a gate.
var gate = new SemaphoreSlim(initialCount: 1);
builder.Add(analyzer, gate);
}
}
return builder.ToImmutable();
}