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;
}
GenericDictionaryLookup genericLookup = _compilation.ComputeGenericLookup(contextMethod, helperId, entity);
if (genericLookup.UseHelper)
{
lookup.runtimeLookup.indirections = CORINFO.USEHELPER;
lookup.lookupKind.runtimeLookupFlags = (ushort)genericLookup.HelperId;
lookup.lookupKind.runtimeLookupArgs = (void *)ObjectToHandle(genericLookup.HelperObject);
}
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.SymbolNodeFactory.ComputeConstantLookup(helperId, entity, _signatureContext);
lookup.constLookup = CreateConstLookupToSymbol(constLookup);
}
}
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 != _methodCodeNode.Method)
{
return;
}
// There is a pathological case where invalid IL refereces __Canon type directly, but there is no dictionary available to store the lookup.
// All callers of ComputeRuntimeLookupForSharedGenericToken have to filter out this case. We can't do much about it here.
Debug.Assert(contextMethod.IsSharedByGenericInstantiations);
if (contextMethod.RequiresInstMethodDescArg())
{
lookup.lookupKind.runtimeLookupKind = CORINFO_RUNTIME_LOOKUP_KIND.CORINFO_LOOKUP_METHODPARAM;
}
else
{
if (contextMethod.RequiresInstMethodTableArg())
{
lookup.lookupKind.runtimeLookupKind = CORINFO_RUNTIME_LOOKUP_KIND.CORINFO_LOOKUP_CLASSPARAM;
}
else
{
lookup.lookupKind.runtimeLookupKind = CORINFO_RUNTIME_LOOKUP_KIND.CORINFO_LOOKUP_THISOBJ;
}
}
// Unless we decide otherwise, just do the lookup via a helper function
lookup.runtimeLookup.indirections = CORINFO.USEHELPER;
lookup.lookupKind.runtimeLookupFlags = (ushort)helperId;
lookup.lookupKind.runtimeLookupArgs = (void *)ObjectToHandle(entity);
lookup.runtimeLookup.indirectFirstOffset = false;
lookup.runtimeLookup.indirectSecondOffset = false;
// For R2R compilations, we don't generate the dictionary lookup signatures (dictionary lookups are done in a
// different way that is more version resilient... plus we can't have pointers to existing MTs/MDs in the sigs)
}
else
{
lookup.lookupKind.needsRuntimeLookup = false;
ISymbolNode constLookup = _compilation.SymbolNodeFactory.ComputeConstantLookup(helperId, entity, _signatureContext);
lookup.constLookup = CreateConstLookupToSymbol(constLookup);
}
}