private void ComputeLookup(ref CORINFO_RESOLVED_TOKEN pResolvedToken, object entity, ReadyToRunHelperId helperId, ref CORINFO_LOOKUP lookup)
{
if (_compilation.NeedsRuntimeLookup(helperId, entity))
{
lookup.lookupKind.needsRuntimeLookup = true;
lookup.runtimeLookup.signature = null;
MethodDesc contextMethod = methodFromContext(pResolvedToken.tokenContext);
// Do not bother computing the runtime lookup if we are inlining. The JIT is going
// to abort the inlining attempt anyway.
if (contextMethod != MethodBeingCompiled)
return;
// Necessary type handle is not something that can be in a dictionary (only a constructed type).
// We only use necessary type handles if we can do a constant lookup.
if (helperId == ReadyToRunHelperId.NecessaryTypeHandle)
helperId = ReadyToRunHelperId.TypeHandle;
GenericDictionaryLookup genericLookup = _compilation.ComputeGenericLookup(contextMethod, helperId, entity);
if (genericLookup.UseHelper)
{
lookup.runtimeLookup.indirections = CORINFO.USEHELPER;
lookup.lookupKind.runtimeLookupFlags = (ushort)helperId;
lookup.lookupKind.runtimeLookupArgs = (void*)ObjectToHandle(entity);
}
else
{
if (genericLookup.ContextSource == GenericContextSource.MethodParameter)
{
lookup.runtimeLookup.helper = CorInfoHelpFunc.CORINFO_HELP_RUNTIMEHANDLE_METHOD;
}
else
{
lookup.runtimeLookup.helper = CorInfoHelpFunc.CORINFO_HELP_RUNTIMEHANDLE_CLASS;
}
lookup.runtimeLookup.indirections = (ushort)genericLookup.NumberOfIndirections;
lookup.runtimeLookup.offset0 = (IntPtr)genericLookup[0];
if (genericLookup.NumberOfIndirections > 1)
lookup.runtimeLookup.offset1 = (IntPtr)genericLookup[1];
lookup.runtimeLookup.testForFixup = false; // TODO: this will be needed in true multifile
lookup.runtimeLookup.testForNull = false;
lookup.runtimeLookup.indirectFirstOffset = false;
lookup.runtimeLookup.indirectSecondOffset = false;
lookup.lookupKind.runtimeLookupFlags = 0;
lookup.lookupKind.runtimeLookupArgs = null;
}
lookup.lookupKind.runtimeLookupKind = GetLookupKindFromContextSource(genericLookup.ContextSource);
}
else
{
lookup.lookupKind.needsRuntimeLookup = false;
ISymbolNode constLookup = _compilation.ComputeConstantLookup(helperId, entity);
lookup.constLookup = CreateConstLookupToSymbol(constLookup);
}
}
private ISymbolNode GetGenericLookupHelper(ReadyToRunHelperId helperId, object helperArgument)
{
GenericDictionaryLookup lookup = _compilation.ComputeGenericLookup(_canonMethod, helperId, helperArgument);
Debug.Assert(lookup.UseHelper);
if (_canonMethod.RequiresInstMethodDescArg())
{
return(_compilation.NodeFactory.ReadyToRunHelperFromDictionaryLookup(lookup.HelperId, lookup.HelperObject, _canonMethod));
}
else
{
Debug.Assert(_canonMethod.RequiresInstArg() || _canonMethod.AcquiresInstMethodTableFromThis());
return(_compilation.NodeFactory.ReadyToRunHelperFromTypeLookup(lookup.HelperId, lookup.HelperObject, _canonMethod.OwningType));
}
}
