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// slang-ir-lower-tuple-types.cpp
#include "slang-ir-lower-tuple-types.h"
#include "slang-ir.h"
#include "slang-ir-insts.h"
namespace Slang
{
struct TupleLoweringContext
{
IRModule* module;
DiagnosticSink* sink;
SharedIRBuilder sharedBuilderStorage;
List<IRInst*> workList;
HashSet<IRInst*> workListSet;
struct LoweredTupleInfo : public RefObject
{
IRType* tupleType;
IRStructType* structType;
List<IRStructField*> fields;
};
Dictionary<IRInst*, RefPtr<LoweredTupleInfo>> mapLoweredStructToTupleInfo;
Dictionary<IRInst*, RefPtr<LoweredTupleInfo>> loweredTuples;
IRType* maybeLowerTupleType(IRBuilder* builder, IRType* type)
{
if (auto info = getLoweredTupleType(builder, type))
return info->structType;
else
return type;
}
LoweredTupleInfo* getLoweredTupleType(IRBuilder* builder, IRInst* type)
{
if (auto loweredInfo = loweredTuples.TryGetValue(type))
return loweredInfo->Ptr();
if (auto loweredInfo = mapLoweredStructToTupleInfo.TryGetValue(type))
return loweredInfo->Ptr();
if (!type)
return nullptr;
if (type->getOp() != kIROp_TupleType)
return nullptr;
RefPtr<LoweredTupleInfo> info = new LoweredTupleInfo();
info->tupleType = (IRType*)type;
auto structType = builder->createStructType();
info->structType = structType;
builder->addNameHintDecoration(structType, UnownedStringSlice("Tuple"));
StringBuilder fieldNameSb;
for (UInt i = 0; i < type->getOperandCount(); i++)
{
auto elementType = maybeLowerTupleType(builder, (IRType*)(type->getOperand(i)));
auto key = builder->createStructKey();
fieldNameSb.Clear();
fieldNameSb << "value" << i;
builder->addNameHintDecoration(key, fieldNameSb.getUnownedSlice());
auto field = builder->createStructField(structType, key, (IRType*)elementType);
info->fields.add(field);
}
mapLoweredStructToTupleInfo[structType] = info;
loweredTuples[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 processMakeTuple(IRMakeTuple* inst)
{
IRBuilder builderStorage(sharedBuilderStorage);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto info = getLoweredTupleType(builder, inst->getDataType());
List<IRInst*> operands;
for (Index i = 0; i < info->fields.getCount(); i++)
{
SLANG_ASSERT(i < (Index)inst->getOperandCount());
operands.add(inst->getOperand(i));
}
auto makeStruct = builder->emitMakeStruct(info->structType, operands);
inst->replaceUsesWith(makeStruct);
inst->removeAndDeallocate();
}
void processGetTupleElement(IRGetTupleElement* inst)
{
IRBuilder builderStorage(sharedBuilderStorage);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto base = inst->getTuple();
auto loweredTupleInfo = getLoweredTupleType(builder, base->getDataType());
SLANG_ASSERT(loweredTupleInfo);
auto elementIndex = getIntVal(inst->getElementIndex());
SLANG_ASSERT((Index)elementIndex < loweredTupleInfo->fields.getCount());
auto field = loweredTupleInfo->fields[(Index)elementIndex];
auto getElement = builder->emitFieldExtract(field->getFieldType(), base, field->getKey());
inst->replaceUsesWith(getElement);
inst->removeAndDeallocate();
}
void processTupleType(IRTupleType* inst)
{
IRBuilder builderStorage(sharedBuilderStorage);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto loweredTupleInfo = getLoweredTupleType(builder, inst);
SLANG_ASSERT(loweredTupleInfo);
SLANG_UNUSED(loweredTupleInfo);
}
void processInst(IRInst* inst)
{
switch (inst->getOp())
{
case kIROp_MakeTuple:
processMakeTuple((IRMakeTuple*)inst);
break;
case kIROp_GetTupleElement:
processGetTupleElement((IRGetTupleElement*)inst);
break;
case kIROp_TupleType:
processTupleType((IRTupleType*)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 tuple types with lowered struct types.
for (auto kv : loweredTuples)
{
kv.Key->replaceUsesWith(kv.Value->structType);
}
}
};
void lowerTuples(IRModule* module, DiagnosticSink* sink)
{
TupleLoweringContext context;
context.module = module;
context.sink = sink;
context.processModule();
}
}
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