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// slang-ir-lower-enum-type.cpp
#include "slang-ir-lower-enum-type.h"
#include "slang-ir-insts.h"
#include "slang-ir-util.h"
#include "slang-ir.h"
namespace Slang
{
struct EnumTypeLoweringContext
{
IRModule* module;
DiagnosticSink* sink;
InstWorkList workList;
InstHashSet workListSet;
IRGeneric* genericOptionalStructType = nullptr;
IRStructKey* valueKey = nullptr;
IRStructKey* hasValueKey = nullptr;
EnumTypeLoweringContext(IRModule* inModule)
: module(inModule), workList(inModule), workListSet(inModule)
{
}
struct LoweredEnumTypeInfo : public RefObject
{
IRType* enumType = nullptr;
IRType* loweredType = nullptr;
};
Dictionary<IRInst*, RefPtr<LoweredEnumTypeInfo>> loweredEnumTypes;
void addToWorkList(IRInst* inst)
{
if (workListSet.contains(inst))
return;
workList.add(inst);
workListSet.add(inst);
}
LoweredEnumTypeInfo* getLoweredEnumType(IRInst* type)
{
if (auto loweredInfo = loweredEnumTypes.tryGetValue(type))
return loweredInfo->Ptr();
if (!type)
return nullptr;
if (type->getOp() != kIROp_EnumType)
return nullptr;
RefPtr<LoweredEnumTypeInfo> info = new LoweredEnumTypeInfo();
auto enumType = cast<IREnumType>(type);
auto valueType = enumType->getTagType();
info->enumType = (IRType*)type;
info->loweredType = valueType;
loweredEnumTypes[type] = info;
return info.Ptr();
}
void processEnumType(IREnumType* inst)
{
auto loweredEnumTypeInfo = getLoweredEnumType(inst);
SLANG_ASSERT(loweredEnumTypeInfo);
SLANG_UNUSED(loweredEnumTypeInfo);
}
void processEnumCast(IRInst* inst)
{
IRBuilder builderStorage(module);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto value = inst->getOperand(0);
if (auto enumType = getLoweredEnumType(value->getDataType()))
{
auto rate = value->getRate();
auto type = enumType->loweredType;
if (rate)
{
type = builder->getRateQualifiedType(rate, type);
}
value->setFullType(type);
}
auto type = inst->getDataType();
if (auto enumType = getLoweredEnumType(type))
{ // Cast was into enum, so use tag type instead.
type = enumType->loweredType;
}
auto cast = builder->emitCast(type, value);
inst->replaceUsesWith(cast);
inst->removeAndDeallocate();
}
void processInst(IRInst* inst)
{
switch (inst->getOp())
{
case kIROp_EnumType:
processEnumType((IREnumType*)inst);
break;
case kIROp_CastEnumToInt:
case kIROp_CastIntToEnum:
case kIROp_EnumCast:
processEnumCast(inst);
break;
default:
break;
}
}
void processModule()
{
addToWorkList(module->getModuleInst());
while (workList.getCount() != 0)
{
IRInst* inst = workList.getLast();
workList.removeLast();
workListSet.remove(inst);
processInst(inst);
for (auto child = inst->getLastChild(); child; child = child->getPrevInst())
{
addToWorkList(child);
}
}
// Replace all enum types with their lowered equivalent types.
for (const auto& [key, value] : loweredEnumTypes)
key->replaceUsesWith(value->loweredType);
}
};
void lowerEnumType(IRModule* module, DiagnosticSink* sink)
{
EnumTypeLoweringContext context(module);
context.sink = sink;
context.processModule();
}
} // namespace Slang
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