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// slang-ir-cleanup-void.cpp
#include "slang-ir-cleanup-void.h"
#include "slang-ir.h"
#include "slang-ir-insts.h"
namespace Slang
{
struct CleanUpVoidContext
{
IRModule* module;
SharedIRBuilder sharedBuilderStorage;
List<IRInst*> workList;
HashSet<IRInst*> workListSet;
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 processInst(IRInst* inst)
{
switch (inst->getOp())
{
case kIROp_Call:
{
// Remove void argument.
auto call = as<IRCall>(inst);
List<IRInst*> newArgs;
for (UInt i = 0; i < call->getArgCount(); i++)
{
auto arg = call->getArg(i);
if (arg->getDataType() && arg->getDataType()->getOp() == kIROp_VoidType)
{
continue;
}
newArgs.add(arg);
}
if (newArgs.getCount() != (Index)call->getArgCount())
{
IRBuilder builder(&sharedBuilderStorage);
builder.setInsertBefore(call);
auto newCall = builder.emitCallInst(call->getFullType(), call->getCallee(), newArgs);
call->replaceUsesWith(newCall);
call->removeAndDeallocate();
inst = newCall;
}
}
break;
case kIROp_Func:
{
// Remove void parameter.
List<IRParam*> paramsToRemove;
auto func = as<IRFunc>(inst);
for (auto param : func->getParams())
{
if (param->getDataType()->getOp() == kIROp_VoidType)
{
paramsToRemove.add(param);
}
}
IRBuilder builder(&sharedBuilderStorage);
builder.setInsertBefore(func);
for (auto param : paramsToRemove)
{
auto voidVal = builder.getVoidValue();
param->replaceUsesWith(voidVal);
param->removeAndDeallocate();
}
}
break;
case kIROp_FuncType:
{
auto funcType = as<IRFuncType>(inst);
List<IRInst*> newOperands;
for (UInt i = 1; i < funcType->getOperandCount(); i++)
{
auto operand = funcType->getOperand(i);
if (operand->getOp() == kIROp_VoidType)
{
continue;
}
newOperands.add(operand);
}
if (newOperands.getCount() != (Index)funcType->getParamCount())
{
IRBuilder builder(&sharedBuilderStorage);
builder.setInsertBefore(funcType);
auto newFuncType = builder.getFuncType(newOperands.getCount(), (IRType**)newOperands.getBuffer(), funcType->getResultType());
if (newFuncType != funcType)
{
funcType->replaceUsesWith(newFuncType);
funcType->removeAndDeallocate();
}
inst = newFuncType;
}
}
break;
case kIROp_StructType:
{
// TODO: cleanup void fields.
}
break;
default:
break;
}
// TODO: If inst has void type, all uses of it should be replaced with void val.
// We should do this only for a subset of opcodes known to be safe.
}
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);
}
}
}
};
void cleanUpVoidType(IRModule* module)
{
CleanUpVoidContext context;
context.module = module;
context.processModule();
}
}
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