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// slang-ir-lower-generic-existential.cpp
#include "slang-ir-lower-existential.h"
#include "slang-ir-generics-lowering-context.h"
#include "slang-ir.h"
#include "slang-ir-insts.h"
namespace Slang
{
bool isCPUTarget(TargetRequest* targetReq);
bool isCUDATarget(TargetRequest* targetReq);
struct ExistentialLoweringContext
{
SharedGenericsLoweringContext* sharedContext;
void processMakeExistential(IRMakeExistentialWithRTTI* inst)
{
IRBuilder builderStorage;
auto builder = &builderStorage;
builder->sharedBuilder = &sharedContext->sharedBuilderStorage;
builder->setInsertBefore(inst);
auto value = inst->getWrappedValue();
auto valueType = sharedContext->lowerType(builder, value->getDataType());
auto witnessTableType = cast<IRWitnessTableType>(inst->getWitnessTable()->getDataType());
auto interfaceType = witnessTableType->getConformanceType();
auto anyValueSize = sharedContext->getInterfaceAnyValueSize(interfaceType, inst->sourceLoc);
auto anyValueType = builder->getAnyValueType(anyValueSize);
auto rttiType = builder->getPtrType(builder->getRTTIType());
auto tupleType = builder->getTupleType(rttiType, witnessTableType, anyValueType);
IRInst* rttiObject = inst->getRTTI();
if (auto type = as<IRType>(rttiObject))
{
rttiObject = sharedContext->maybeEmitRTTIObject(type);
rttiObject = builder->emitGetAddress(rttiType, rttiObject);
}
IRInst* packedValue = value;
if (valueType->op != kIROp_AnyValueType)
packedValue = builder->emitPackAnyValue(anyValueType, value);
IRInst* tupleArgs[] = {rttiObject, inst->getWitnessTable(), packedValue};
auto tuple = builder->emitMakeTuple(tupleType, 3, tupleArgs);
inst->replaceUsesWith(tuple);
inst->removeAndDeallocate();
}
IRInst* extractTupleElement(IRBuilder* builder, IRInst* value, UInt index)
{
auto tupleType = cast<IRTupleType>(sharedContext->lowerType(builder, value->getDataType()));
auto getElement = builder->emitGetTupleElement(
(IRType*)tupleType->getOperand(index),
value,
index);
return getElement;
}
void processExtractExistentialElement(IRInst* extractInst, UInt elementId)
{
IRBuilder builderStorage;
auto builder = &builderStorage;
builder->sharedBuilder = &sharedContext->sharedBuilderStorage;
builder->setInsertBefore(extractInst);
auto element = extractTupleElement(builder, extractInst->getOperand(0), elementId);
extractInst->replaceUsesWith(element);
extractInst->removeAndDeallocate();
}
void processExtractExistentialValue(IRExtractExistentialValue* inst)
{
processExtractExistentialElement(inst, 2);
}
void processExtractExistentialWitnessTable(IRExtractExistentialWitnessTable* inst)
{
processExtractExistentialElement(inst, 1);
}
void processExtractExistentialType(IRExtractExistentialType* inst)
{
processExtractExistentialElement(inst, 0);
}
void processGetValueFromExistentialBox(IRGetValueFromExistentialBox* inst)
{
// Currently we do not translate on HLSL/GLSL targets,
// since we don't attempt to actually layout the value inside an fixed sized
// existential box for these targets.
if (isCPUTarget(sharedContext->targetReq) || isCUDATarget(sharedContext->targetReq))
{
IRBuilder builderStorage;
auto builder = &builderStorage;
builder->sharedBuilder = &sharedContext->sharedBuilderStorage;
builder->setInsertBefore(inst);
auto element = extractTupleElement(builder, inst->getOperand(0), 2);
// TODO: it is not technically sound to use `getAddress` on a temporary value.
// We probably need to develop a mechanism to allow a temporary value to be used
// in the place of a pointer.
auto elementAddr =
builder->emitGetAddress(builder->getPtrType(element->getDataType()), element);
auto reinterpretAddr = builder->emitBitCast(inst->getDataType(), elementAddr);
inst->replaceUsesWith(reinterpretAddr);
inst->removeAndDeallocate();
}
}
void processInst(IRInst* inst)
{
if (auto makeExistential = as<IRMakeExistentialWithRTTI>(inst))
{
processMakeExistential(makeExistential);
}
else if (auto getExistentialValue = as<IRGetValueFromExistentialBox>(inst))
{
processGetValueFromExistentialBox(getExistentialValue);
}
else if (auto extractExistentialVal = as<IRExtractExistentialValue>(inst))
{
processExtractExistentialValue(extractExistentialVal);
}
else if (auto extractExistentialType = as<IRExtractExistentialType>(inst))
{
processExtractExistentialType(extractExistentialType);
}
else if (auto extractExistentialWitnessTable = as<IRExtractExistentialWitnessTable>(inst))
{
processExtractExistentialWitnessTable(extractExistentialWitnessTable);
}
}
void processModule()
{
// We start by initializing our shared IR building state,
// since we will re-use that state for any code we
// generate along the way.
//
SharedIRBuilder* sharedBuilder = &sharedContext->sharedBuilderStorage;
sharedBuilder->module = sharedContext->module;
sharedBuilder->session = sharedContext->module->session;
sharedContext->addToWorkList(sharedContext->module->getModuleInst());
while (sharedContext->workList.getCount() != 0)
{
IRInst* inst = sharedContext->workList.getLast();
sharedContext->workList.removeLast();
sharedContext->workListSet.Remove(inst);
processInst(inst);
for (auto child = inst->getLastChild(); child; child = child->getPrevInst())
{
sharedContext->addToWorkList(child);
}
}
}
};
void lowerExistentials(SharedGenericsLoweringContext* sharedContext)
{
ExistentialLoweringContext context;
context.sharedContext = sharedContext;
context.processModule();
}
}
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