public abstract IntPtr OnEntryPoint(MethodEntrypointPtr entrypointInfo, IntPtr callerArgumentsInfo);
public static bool TryGetMethodEntrypoint(MethodDesc methodOnType, out IntPtr entryPoint, out IntPtr unboxingStubAddress, out TypeLoaderEnvironment.MethodAddressType foundAddressType)
{
MethodDesc typicalMethod = methodOnType.GetTypicalMethodDefinition();
if (!(typicalMethod is EcmaMethod))
{
foundAddressType = TypeLoaderEnvironment.MethodAddressType.None;
entryPoint = IntPtr.Zero;
unboxingStubAddress = IntPtr.Zero;
return(false);
}
// OK, this is a method entrypoint for an ecma method
EcmaMethod ecmaTypicalMethod = (EcmaMethod)typicalMethod;
// Canonicalize
MethodDesc canonMethod = methodOnType.GetCanonMethodTarget(CanonicalFormKind.Specific);
if (canonMethod != methodOnType)
{
foundAddressType = TypeLoaderEnvironment.MethodAddressType.Canonical;
}
else
{
foundAddressType = TypeLoaderEnvironment.MethodAddressType.Exact;
}
// Check to see if we should produce an unboxing stub entrypoint
unboxingStubAddress = IntPtr.Zero; // Optimistically choose not to
if (ecmaTypicalMethod.OwningType.IsValueType)
{
MethodSignature methodSig = ecmaTypicalMethod.Signature;
if (!methodSig.IsStatic)
{
unboxingStubAddress = new IntPtr(5); // TODO Actually implement the unboxing stub logic
}
}
// Ensure RuntimeTypeHandles for owningType, and for instantiation types
// They should be there, as the paths to this function should ensure it, but its a bit sketchy
// as we don't have an opportunity to easily compute them now
if (!canonMethod.OwningType.RetrieveRuntimeTypeHandleIfPossible())
{
Environment.FailFast("Did not pre-allocate owning type typehandle");
}
foreach (TypeDesc type in canonMethod.Instantiation)
{
if (!type.RetrieveRuntimeTypeHandleIfPossible())
{
Environment.FailFast("Did not pre-allocate instantiation type typehandle");
}
}
// We need to create a RuntimeMethodHandle for this method
MethodEntrypointPtr entrypoint = s_methodEntrypointHash.GetOrCreateValue(new MethodEntrypointLookup(canonMethod));
if (entrypoint.MethodCode != IntPtr.Zero)
{
entryPoint = entrypoint.MethodCode;
}
else
{
entryPoint = entrypoint.MethodEntrypointThunk;
}
return(true);
}