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// slang-ir-lower-optional-type.cpp
#include "slang-ir-lower-optional-type.h"
#include "slang-ir.h"
#include "slang-ir-insts.h"
#include "slang-ir-util.h"
namespace Slang
{
struct OptionalTypeLoweringContext
{
IRModule* module;
DiagnosticSink* sink;
SharedIRBuilder sharedBuilderStorage;
List<IRInst*> workList;
HashSet<IRInst*> workListSet;
struct LoweredOptionalTypeInfo : public RefObject
{
IRType* optionalType = nullptr;
IRType* valueType = nullptr;
IRType* loweredType = nullptr;
IRStructField* valueField = nullptr;
IRStructField* hasValueField = nullptr;
};
Dictionary<IRInst*, RefPtr<LoweredOptionalTypeInfo>> mapLoweredTypeToOptionalTypeInfo;
Dictionary<IRInst*, RefPtr<LoweredOptionalTypeInfo>> loweredOptionalTypes;
IRType* maybeLowerOptionalType(IRBuilder* builder, IRType* type)
{
if (auto info = getLoweredOptionalType(builder, type))
return info->loweredType;
else
return type;
}
bool typeHasNullValue(IRInst* type)
{
switch (type->getOp())
{
case kIROp_ComPtrType:
case kIROp_NativePtrType:
case kIROp_NativeStringType:
case kIROp_PtrType:
case kIROp_ClassType:
return true;
case kIROp_InterfaceType:
return isComInterfaceType((IRType*)type);
default:
return false;
}
}
LoweredOptionalTypeInfo* getLoweredOptionalType(IRBuilder* builder, IRInst* type)
{
if (auto loweredInfo = loweredOptionalTypes.TryGetValue(type))
return loweredInfo->Ptr();
if (auto loweredInfo = mapLoweredTypeToOptionalTypeInfo.TryGetValue(type))
return loweredInfo->Ptr();
if (!type)
return nullptr;
if (type->getOp() != kIROp_OptionalType)
return nullptr;
RefPtr<LoweredOptionalTypeInfo> info = new LoweredOptionalTypeInfo();
auto optionalType = cast<IROptionalType>(type);
auto valueType = optionalType->getValueType();
info->optionalType = (IRType*)type;
info->valueType = valueType;
if (typeHasNullValue(valueType))
{
info->loweredType = valueType;
}
else
{
auto structType = builder->createStructType();
info->loweredType = structType;
builder->addNameHintDecoration(structType, UnownedStringSlice("OptionalType"));
info->valueType = valueType;
auto valueKey = builder->createStructKey();
builder->addNameHintDecoration(valueKey, UnownedStringSlice("value"));
info->valueField = builder->createStructField(structType, valueKey, (IRType*)valueType);
auto boolType = builder->getBoolType();
auto hasValueKey = builder->createStructKey();
builder->addNameHintDecoration(hasValueKey, UnownedStringSlice("hasValue"));
info->hasValueField = builder->createStructField(structType, hasValueKey, (IRType*)boolType);
}
mapLoweredTypeToOptionalTypeInfo[info->loweredType] = info;
loweredOptionalTypes[type] = info;
return info.Ptr();
}
void addToWorkList(
IRInst* inst)
{
for (auto ii = inst->getParent(); ii; ii = ii->getParent())
{
if (as<IRGeneric>(ii))
return;
}
if (workListSet.Contains(inst))
return;
workList.add(inst);
workListSet.Add(inst);
}
void processMakeOptionalValue(IRMakeOptionalValue* inst)
{
IRBuilder builderStorage(sharedBuilderStorage);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto info = getLoweredOptionalType(builder, inst->getDataType());
if (info->loweredType != info->valueType)
{
List<IRInst*> operands;
operands.add(inst->getOperand(0));
operands.add(builder->getBoolValue(true));
auto makeStruct = builder->emitMakeStruct(info->loweredType, operands);
inst->replaceUsesWith(makeStruct);
inst->removeAndDeallocate();
}
else
{
inst->replaceUsesWith(inst->getOperand(0));
inst->removeAndDeallocate();
}
}
void processMakeOptionalNone(IRMakeOptionalNone* inst)
{
IRBuilder builderStorage(sharedBuilderStorage);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto info = getLoweredOptionalType(builder, inst->getDataType());
if (info->loweredType != info->valueType)
{
List<IRInst*> operands;
operands.add(inst->getDefaultValue());
operands.add(builder->getBoolValue(false));
auto makeStruct = builder->emitMakeStruct(info->loweredType, operands);
inst->replaceUsesWith(makeStruct);
inst->removeAndDeallocate();
}
else
{
inst->replaceUsesWith(builder->getNullPtrValue(info->valueType));
inst->removeAndDeallocate();
}
}
IRInst* getOptionalHasValue(IRBuilder* builder, IRInst* optionalInst)
{
auto loweredOptionalTypeInfo = getLoweredOptionalType(builder, optionalInst->getDataType());
SLANG_ASSERT(loweredOptionalTypeInfo);
IRInst* result = nullptr;
if (loweredOptionalTypeInfo->loweredType != loweredOptionalTypeInfo->valueType)
{
result = builder->emitFieldExtract(
builder->getBoolType(),
optionalInst,
loweredOptionalTypeInfo->hasValueField->getKey());
}
else
{
result = builder->emitCastPtrToBool(optionalInst);
}
return result;
}
void processGetOptionalHasValue(IROptionalHasValue* inst)
{
IRBuilder builderStorage(sharedBuilderStorage);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto optionalValue = inst->getOptionalOperand();
auto hasVal = getOptionalHasValue(builder, optionalValue);
inst->replaceUsesWith(hasVal);
inst->removeAndDeallocate();
}
void processGetOptionalValue(IRGetOptionalValue* inst)
{
IRBuilder builderStorage(sharedBuilderStorage);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto base = inst->getOptionalOperand();
auto loweredOptionalTypeInfo = getLoweredOptionalType(builder, base->getDataType());
if (loweredOptionalTypeInfo->loweredType != loweredOptionalTypeInfo->valueType)
{
SLANG_ASSERT(loweredOptionalTypeInfo);
SLANG_ASSERT(loweredOptionalTypeInfo->valueField);
auto getElement = builder->emitFieldExtract(
loweredOptionalTypeInfo->valueType,
base,
loweredOptionalTypeInfo->valueField->getKey());
inst->replaceUsesWith(getElement);
}
else
{
inst->replaceUsesWith(base);
}
inst->removeAndDeallocate();
}
void processOptionalType(IROptionalType* inst)
{
IRBuilder builderStorage(sharedBuilderStorage);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto loweredOptionalTypeInfo = getLoweredOptionalType(builder, inst);
SLANG_ASSERT(loweredOptionalTypeInfo);
SLANG_UNUSED(loweredOptionalTypeInfo);
}
void processInst(IRInst* inst)
{
switch (inst->getOp())
{
case kIROp_MakeOptionalValue:
processMakeOptionalValue((IRMakeOptionalValue*)inst);
break;
case kIROp_MakeOptionalNone:
processMakeOptionalNone((IRMakeOptionalNone*)inst);
break;
case kIROp_OptionalHasValue:
processGetOptionalHasValue((IROptionalHasValue*)inst);
break;
case kIROp_GetOptionalValue:
processGetOptionalValue((IRGetOptionalValue*)inst);
break;
case kIROp_OptionalType:
processOptionalType((IROptionalType*)inst);
break;
default:
break;
}
}
void processModule()
{
SharedIRBuilder* sharedBuilder = &sharedBuilderStorage;
sharedBuilder->init(module);
// Deduplicate equivalent types.
sharedBuilder->deduplicateAndRebuildGlobalNumberingMap();
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 optional types with lowered struct types.
for (auto kv : loweredOptionalTypes)
{
kv.Key->replaceUsesWith(kv.Value->loweredType);
}
}
};
void lowerOptionalType(IRModule* module, DiagnosticSink* sink)
{
OptionalTypeLoweringContext context;
context.module = module;
context.sink = sink;
context.processModule();
}
}
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