private static ModuleBuilder GetProxyModuleBuilder()
{
Assumes.True(Monitor.IsEntered(MetadataViewFactories));
if (transparentProxyModuleBuilder == null)
{
// make a new assemblybuilder and modulebuilder
var assemblyBuilder = CreateProxyAssemblyBuilder(typeof(SecurityTransparentAttribute).GetTypeInfo().GetConstructor(Type.EmptyTypes));
transparentProxyModuleBuilder = assemblyBuilder.DefineDynamicModule("MetadataViewProxiesModule");
skipClrVisibilityChecks = new SkipClrVisibilityChecks(assemblyBuilder, transparentProxyModuleBuilder);
}
return(transparentProxyModuleBuilder);
}
/// <summary>
/// Gets the <see cref="ModuleBuilder"/> to use for generating a proxy for the given type.
/// </summary>
/// <param name="viewType">The type of the interface to generate a proxy for.</param>
/// <returns>The <see cref="ModuleBuilder"/> to use.</returns>
private static ModuleBuilder GetProxyModuleBuilder(TypeInfo viewType)
{
Requires.NotNull(viewType, nameof(viewType));
Assumes.True(Monitor.IsEntered(MetadataViewFactories));
// Dynamic assemblies are relatively expensive. We want to create as few as possible.
// For each unique set of skip visibility check assemblies, we need a new dynamic assembly
// because the CLR will not honor any additions to that set once the first generated type is closed.
// So maintain a dictionary to point at dynamic modules based on the set of skip visiblity check assemblies they were generated with.
var skipVisibilityCheckAssemblies = SkipClrVisibilityChecks.GetSkipVisibilityChecksRequirements(viewType);
if (!TransparentProxyModuleBuilderByVisibilityCheck.TryGetValue(skipVisibilityCheckAssemblies, out ModuleBuilder moduleBuilder))
{
var assemblyBuilder = CreateProxyAssemblyBuilder(typeof(SecurityTransparentAttribute).GetTypeInfo().GetConstructor(Type.EmptyTypes));
moduleBuilder = assemblyBuilder.DefineDynamicModule("MetadataViewProxiesModule");
var skipClrVisibilityChecks = new SkipClrVisibilityChecks(assemblyBuilder, moduleBuilder);
skipClrVisibilityChecks.SkipVisibilityChecksFor(skipVisibilityCheckAssemblies);
TransparentProxyModuleBuilderByVisibilityCheck.Add(skipVisibilityCheckAssemblies, moduleBuilder);
}
return(moduleBuilder);
}
