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// slang-ir-lower-result-type.cpp
#include "slang-ir-lower-result-type.h"
#include "slang-ir-any-value-marshalling.h"
#include "slang-ir-insts.h"
#include "slang-ir.h"
namespace Slang
{
struct ResultTypeLoweringContext
{
IRModule* module;
DiagnosticSink* sink;
InstWorkList workList;
InstHashSet workListSet;
ResultTypeLoweringContext(IRModule* inModule)
: module(inModule), workList(inModule), workListSet(inModule)
{
}
struct LoweredResultTypeInfo : public RefObject
{
IRType* resultType = nullptr;
IRType* loweredType = nullptr;
IRType* tagType = nullptr;
IRType* valueType = nullptr;
IRType* errorType = nullptr;
IRType* anyValueType = nullptr;
IRStructField* tagField = nullptr;
IRStructField* anyValueField = nullptr;
};
Dictionary<IRInst*, RefPtr<LoweredResultTypeInfo>> mapLoweredTypeToResultTypeInfo;
Dictionary<IRInst*, RefPtr<LoweredResultTypeInfo>> loweredResultTypes;
IRType* maybeLowerResultType(IRBuilder* builder, IRType* type)
{
if (auto info = getLoweredResultType(builder, type))
return info->loweredType;
else
return type;
}
LoweredResultTypeInfo* getLoweredResultType(IRBuilder* builder, IRInst* type)
{
if (auto loweredInfo = loweredResultTypes.tryGetValue(type))
return loweredInfo->Ptr();
if (auto loweredInfo = mapLoweredTypeToResultTypeInfo.tryGetValue(type))
return loweredInfo->Ptr();
if (!type)
return nullptr;
if (type->getOp() != kIROp_ResultType)
return nullptr;
RefPtr<LoweredResultTypeInfo> info = new LoweredResultTypeInfo();
auto resultType = cast<IRResultType>(type);
info->resultType = (IRType*)type;
auto structType = builder->createStructType();
info->loweredType = structType;
builder->addNameHintDecoration(structType, UnownedStringSlice("ResultType"));
info->tagType = builder->getBoolType();
auto tagKey = builder->createStructKey();
builder->addNameHintDecoration(tagKey, UnownedStringSlice("tag"));
info->tagField = builder->createStructField(structType, tagKey, info->tagType);
SlangInt anyValueSize = 0;
auto valueType = resultType->getValueType();
if (valueType->getOp() != kIROp_VoidType)
{
anyValueSize = getAnyValueSize(valueType);
info->valueType = valueType;
}
auto errorType = resultType->getErrorType();
info->errorType = errorType;
auto errSize = getAnyValueSize(errorType);
if (errSize > anyValueSize)
anyValueSize = errSize;
info->anyValueType =
builder->getAnyValueType(builder->getIntValue(builder->getUIntType(), anyValueSize));
auto anyValueKey = builder->createStructKey();
builder->addNameHintDecoration(anyValueKey, UnownedStringSlice("anyValue"));
info->anyValueField =
builder->createStructField(structType, anyValueKey, info->anyValueType);
mapLoweredTypeToResultTypeInfo[info->loweredType] = info;
loweredResultTypes[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 processMakeResultValue(IRMakeResultValue* inst)
{
IRBuilder builderStorage(module);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto info = getLoweredResultType(builder, inst->getDataType());
List<IRInst*> operands;
operands.add(builder->getBoolValue(false));
auto packInst = builder->emitPackAnyValue(
info->anyValueType,
info->valueType ? inst->getOperand(0) : builder->emitDefaultConstruct(info->errorType));
operands.add(packInst);
auto makeStruct = builder->emitMakeStruct(info->loweredType, operands);
inst->replaceUsesWith(makeStruct);
inst->removeAndDeallocate();
}
void processMakeResultError(IRMakeResultError* inst)
{
IRBuilder builderStorage(module);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto info = getLoweredResultType(builder, inst->getDataType());
auto packInst = builder->emitPackAnyValue(info->anyValueType, inst->getErrorValue());
List<IRInst*> operands;
operands.add(builder->getBoolValue(true));
operands.add(packInst);
auto makeStruct = builder->emitMakeStruct(info->loweredType, operands);
inst->replaceUsesWith(makeStruct);
inst->removeAndDeallocate();
}
IRInst* getResultError(IRBuilder* builder, IRInst* resultInst)
{
auto loweredResultTypeInfo = getLoweredResultType(builder, resultInst->getDataType());
SLANG_ASSERT(loweredResultTypeInfo);
if (loweredResultTypeInfo->valueType)
{
auto value = builder->emitFieldExtract(
loweredResultTypeInfo->anyValueType,
resultInst,
loweredResultTypeInfo->anyValueField->getKey());
auto unpackInst = builder->emitUnpackAnyValue(loweredResultTypeInfo->errorType, value);
return unpackInst;
}
else
{
return resultInst;
}
}
void processGetResultError(IRGetResultError* inst)
{
IRBuilder builderStorage(module);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto resultValue = inst->getResultOperand();
auto errValue = getResultError(builder, resultValue);
inst->replaceUsesWith(errValue);
inst->removeAndDeallocate();
}
void processGetResultValue(IRGetResultValue* inst)
{
IRBuilder builderStorage(module);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto base = inst->getResultOperand();
auto loweredResultTypeInfo = getLoweredResultType(builder, base->getDataType());
SLANG_ASSERT(loweredResultTypeInfo);
SLANG_ASSERT(loweredResultTypeInfo->valueType);
auto getElement = builder->emitFieldExtract(
loweredResultTypeInfo->anyValueType,
base,
loweredResultTypeInfo->anyValueField->getKey());
auto unpackInst = builder->emitUnpackAnyValue(loweredResultTypeInfo->valueType, getElement);
inst->replaceUsesWith(unpackInst);
inst->removeAndDeallocate();
}
void processIsResultError(IRIsResultError* inst)
{
IRBuilder builderStorage(module);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto base = inst->getResultOperand();
auto loweredResultTypeInfo = getLoweredResultType(builder, base->getDataType());
SLANG_ASSERT(loweredResultTypeInfo);
auto isFailure = builder->emitFieldExtract(
loweredResultTypeInfo->tagType,
base,
loweredResultTypeInfo->tagField->getKey());
inst->replaceUsesWith(isFailure);
inst->removeAndDeallocate();
}
void processResultType(IRResultType* inst)
{
IRBuilder builderStorage(module);
auto builder = &builderStorage;
builder->setInsertBefore(inst);
auto loweredResultTypeInfo = getLoweredResultType(builder, inst);
SLANG_ASSERT(loweredResultTypeInfo);
SLANG_UNUSED(loweredResultTypeInfo);
}
void processInst(IRInst* inst)
{
switch (inst->getOp())
{
case kIROp_MakeResultValue:
processMakeResultValue((IRMakeResultValue*)inst);
break;
case kIROp_MakeResultError:
processMakeResultError((IRMakeResultError*)inst);
break;
case kIROp_GetResultError:
processGetResultError((IRGetResultError*)inst);
break;
case kIROp_GetResultValue:
processGetResultValue((IRGetResultValue*)inst);
break;
case kIROp_IsResultError:
processIsResultError((IRIsResultError*)inst);
break;
case kIROp_ResultType:
processResultType((IRResultType*)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 result types with lowered struct types.
for (const auto& [key, value] : loweredResultTypes)
key->replaceUsesWith(value->loweredType);
}
};
void lowerResultType(IRModule* module, DiagnosticSink* sink)
{
ResultTypeLoweringContext context(module);
context.sink = sink;
context.processModule();
}
} // namespace Slang
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