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#include "slang-ir-check-recursive-type.h"
#include "slang-ir-util.h"
namespace Slang
{
bool checkTypeRecursionImpl(HashSet<IRInst*>& checkedTypes, HashSet<IRInst*>& stack, IRInst* type, IRInst* field, DiagnosticSink* sink)
{
auto visitElementType = [&](IRInst* elementType, IRInst* field) -> bool
{
if (!stack.add(elementType))
{
sink->diagnose(field ? field : type, Diagnostics::recursiveType, type);
return false;
}
if (checkedTypes.add(elementType))
checkTypeRecursionImpl(checkedTypes, stack, elementType, field, sink);
stack.remove(elementType);
return true;
};
if (auto arrayType = as<IRArrayTypeBase>(type))
{
return visitElementType(arrayType->getElementType(), field);
}
else if (auto structType = as<IRStructType>(type))
{
for (auto sfield : structType->getFields())
if (!visitElementType(sfield->getFieldType(), sfield))
return false;
}
return true;
}
void checkTypeRecursion(HashSet<IRInst*>& checkedTypes, IRInst* type, DiagnosticSink* sink)
{
HashSet<IRInst*> stack;
if (checkedTypes.add(type))
{
stack.add(type);
checkTypeRecursionImpl(checkedTypes, stack, type, nullptr, sink);
}
}
void checkForRecursiveTypes(IRModule* module, DiagnosticSink* sink)
{
HashSet<IRInst*> checkedTypes;
for (auto globalInst : module->getGlobalInsts())
{
switch (globalInst->getOp())
{
case kIROp_StructType:
{
checkTypeRecursion(checkedTypes, globalInst, sink);
}
break;
}
}
}
}
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