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//slang-ir-generics-lowering-context.cpp
#include "slang-ir-generics-lowering-context.h"
#include "slang-ir-layout.h"
namespace Slang
{
bool isPolymorphicType(IRInst* typeInst)
{
if (as<IRParam>(typeInst) && as<IRTypeType>(typeInst->getDataType()))
return true;
switch (typeInst->op)
{
case kIROp_ThisType:
case kIROp_AssociatedType:
case kIROp_InterfaceType:
case kIROp_lookup_interface_method:
return true;
case kIROp_Specialize:
{
for (UInt i = 0; i < typeInst->getOperandCount(); i++)
{
if (isPolymorphicType(typeInst->getOperand(i)))
return true;
}
return false;
}
default:
break;
}
if (auto ptrType = as<IRPtrTypeBase>(typeInst))
{
return isPolymorphicType(ptrType->getValueType());
}
return false;
}
bool isTypeValue(IRInst* typeInst)
{
if (typeInst)
{
switch (typeInst->op)
{
case kIROp_TypeType:
case kIROp_TypeKind:
return true;
default:
return false;
}
}
return false;
}
IRInst* SharedGenericsLoweringContext::maybeEmitRTTIObject(IRInst* typeInst)
{
IRInst* result = nullptr;
if (mapTypeToRTTIObject.TryGetValue(typeInst, result))
return result;
IRBuilder builderStorage;
auto builder = &builderStorage;
builder->sharedBuilder = &sharedBuilderStorage;
builder->setInsertBefore(typeInst->next);
result = builder->emitMakeRTTIObject(typeInst);
// For now the only type info we encapsualte is type size.
IRSizeAndAlignment sizeAndAlignment;
getNaturalSizeAndAlignment((IRType*)typeInst, &sizeAndAlignment);
builder->addRTTITypeSizeDecoration(result, sizeAndAlignment.size);
// Give a name to the rtti object.
if (auto exportDecoration = typeInst->findDecoration<IRExportDecoration>())
{
String rttiObjName = exportDecoration->getMangledName();
builder->addExportDecoration(result, rttiObjName.getUnownedSlice());
}
// Make sure the RTTI object for a public struct type has public visiblity.
if (typeInst->findDecoration<IRPublicDecoration>())
{
builder->addPublicDecoration(result);
builder->addKeepAliveDecoration(result);
}
mapTypeToRTTIObject[typeInst] = result;
return result;
}
IRInst* SharedGenericsLoweringContext::findInterfaceRequirementVal(IRInterfaceType* interfaceType, IRInst* requirementKey)
{
if (auto dict = mapInterfaceRequirementKeyValue.TryGetValue(interfaceType))
return (*dict)[requirementKey].GetValue();
_builldInterfaceRequirementMap(interfaceType);
return findInterfaceRequirementVal(interfaceType, requirementKey);
}
void SharedGenericsLoweringContext::_builldInterfaceRequirementMap(IRInterfaceType* interfaceType)
{
mapInterfaceRequirementKeyValue.Add(interfaceType,
Dictionary<IRInst*, IRInst*>());
auto dict = mapInterfaceRequirementKeyValue.TryGetValue(interfaceType);
for (UInt i = 0; i < interfaceType->getOperandCount(); i++)
{
auto entry = cast<IRInterfaceRequirementEntry>(interfaceType->getOperand(i));
(*dict)[entry->getRequirementKey()] = entry->getRequirementVal();
}
}
IRType* SharedGenericsLoweringContext::lowerAssociatedType(IRBuilder* builder, IRInst* type)
{
if (type->op != kIROp_AssociatedType)
return (IRType*)type;
IRIntegerValue anyValueSize = kInvalidAnyValueSize;
for (UInt i = 0; i < type->getOperandCount(); i++)
{
anyValueSize = Math::Min(
anyValueSize,
getInterfaceAnyValueSize(type->getOperand(i), type->sourceLoc));
}
if (anyValueSize == kInvalidAnyValueSize)
{
sink->diagnose(type->sourceLoc, Diagnostics::dynamicInterfaceLacksAnyValueSizeAttribute, type);
}
return builder->getAnyValueType(anyValueSize);
}
IRType* SharedGenericsLoweringContext::lowerType(IRBuilder* builder, IRInst* paramType, const Dictionary<IRInst*, IRInst*>& typeMapping)
{
if (!paramType)
return nullptr;
IRInst* resultType;
if (typeMapping.TryGetValue(paramType, resultType))
return (IRType*)resultType;
if (isTypeValue(paramType))
{
return builder->getRTTIHandleType();
}
IRIntegerValue anyValueSize = kInvalidAnyValueSize;
switch (paramType->op)
{
case kIROp_WitnessTableType:
case kIROp_WitnessTableIDType:
case kIROp_ExtractExistentialType:
// Do not translate these types.
return (IRType*)paramType;
case kIROp_Param:
{
if (auto anyValueSizeDecor = paramType->findDecoration<IRTypeConstraintDecoration>())
{
if (isBuiltin(anyValueSizeDecor->getConstraintType()))
return (IRType*)paramType;
anyValueSize = getInterfaceAnyValueSize(anyValueSizeDecor->getConstraintType(), paramType->sourceLoc);
return builder->getAnyValueType(anyValueSize);
}
sink->diagnose(paramType, Diagnostics::unconstrainedGenericParameterNotAllowedInDynamicFunction, paramType);
return builder->getAnyValueType(kInvalidAnyValueSize);
}
case kIROp_ThisType:
if (isBuiltin(cast<IRThisType>(paramType)->getConstraintType()))
return (IRType*)paramType;
anyValueSize = getInterfaceAnyValueSize(
cast<IRThisType>(paramType)->getConstraintType(),
paramType->sourceLoc);
return builder->getAnyValueType(anyValueSize);
case kIROp_AssociatedType:
{
return lowerAssociatedType(builder, paramType);
}
case kIROp_InterfaceType:
{
if (isBuiltin(paramType))
return (IRType*)paramType;
// An existential type translates into a tuple of (AnyValue, WitnessTable, RTTI*)
anyValueSize = getInterfaceAnyValueSize(paramType, paramType->sourceLoc);
auto anyValueType = builder->getAnyValueType(anyValueSize);
auto witnessTableType = builder->getWitnessTableIDType((IRType*)paramType);
auto rttiType = builder->getRTTIHandleType();
auto tupleType = builder->getTupleType(rttiType, witnessTableType, anyValueType);
return tupleType;
}
case kIROp_lookup_interface_method:
{
auto lookupInterface = static_cast<IRLookupWitnessMethod*>(paramType);
auto interfaceType = cast<IRInterfaceType>(cast<IRWitnessTableType>(
lookupInterface->getWitnessTable()->getDataType())->getConformanceType());
if (isBuiltin(interfaceType))
return (IRType*)paramType;
// Make sure we are looking up inside the original interface type (prior to lowering).
// Only in the original interface type will an associated type entry have an IRAssociatedType value.
// We need to extract AnyValueSize from this IRAssociatedType.
// In lowered interface type, that entry is lowered into an Ptr(RTTIType) and this info is lost.
mapLoweredInterfaceToOriginal.TryGetValue(interfaceType, interfaceType);
auto reqVal = findInterfaceRequirementVal(
interfaceType,
lookupInterface->getRequirementKey());
SLANG_ASSERT(reqVal && reqVal->op == kIROp_AssociatedType);
return lowerType(builder, reqVal, typeMapping);
}
case kIROp_ExistentialBoxType:
{
auto existentialBoxType = static_cast<IRExistentialBoxType*>(paramType);
return lowerType(builder, existentialBoxType->getInterfaceType(), typeMapping);
}
default:
{
bool translated = false;
List<IRInst*> loweredOperands;
for (UInt i = 0; i < paramType->getOperandCount(); i++)
{
loweredOperands.add(lowerType(builder, paramType->getOperand(i), typeMapping));
if (loweredOperands.getLast() != paramType->getOperand(i))
translated = true;
}
if (translated)
return builder->getType(paramType->op, loweredOperands.getCount(), loweredOperands.getBuffer());
return (IRType*)paramType;
}
}
}
List<IRWitnessTable*> SharedGenericsLoweringContext::getWitnessTablesFromInterfaceType(IRInst* interfaceType)
{
List<IRWitnessTable*> witnessTables;
for (auto globalInst : module->getGlobalInsts())
{
if (globalInst->op == kIROp_WitnessTable &&
cast<IRWitnessTableType>(globalInst->getDataType())->getConformanceType() ==
interfaceType)
{
witnessTables.add(cast<IRWitnessTable>(globalInst));
}
}
return witnessTables;
}
IRIntegerValue SharedGenericsLoweringContext::getInterfaceAnyValueSize(IRInst* type, SourceLoc usageLocation)
{
if (auto decor = type->findDecoration<IRAnyValueSizeDecoration>())
{
return decor->getSize();
}
sink->diagnose(type->sourceLoc, Diagnostics::dynamicInterfaceLacksAnyValueSizeAttribute, type);
sink->diagnose(usageLocation, Diagnostics::seeInterfaceUsage, type);
return kInvalidAnyValueSize;
}
}
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