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#include "slang-ir-any-value-inference.h"
#include "../core/slang-func-ptr.h"
#include "slang-ir-generics-lowering-context.h"
#include "slang-ir-insts.h"
#include "slang-ir-layout.h"
#include "slang-ir-util.h"
#include "slang-ir.h"
namespace Slang
{
void _findDependenciesOfTypeInSet(
IRType* type,
HashSet<IRInterfaceType*>& targetSet,
List<IRInterfaceType*>& result)
{
switch (type->getOp())
{
case kIROp_InterfaceType:
{
auto interfaceType = cast<IRInterfaceType>(type);
if (targetSet.contains(interfaceType))
{
result.add(interfaceType);
return;
}
}
break;
case kIROp_StructType:
{
auto structType = cast<IRStructType>(type);
for (auto field : structType->getFields())
{
_findDependenciesOfTypeInSet(field->getFieldType(), targetSet, result);
}
}
break;
default:
{
for (UInt i = 0; i < type->getOperandCount(); i++)
{
if (auto operandType = as<IRType>(type->getOperand(i)))
_findDependenciesOfTypeInSet(operandType, targetSet, result);
}
}
break;
}
}
List<IRInterfaceType*> findDependenciesOfTypeInSet(
IRType* type,
HashSet<IRInterfaceType*> targetSet)
{
List<IRInterfaceType*> result;
_findDependenciesOfTypeInSet(type, targetSet, result);
return result;
}
void _sortTopologically(
IRInterfaceType* interfaceType,
HashSet<IRInterfaceType*>& visited,
List<IRInterfaceType*>& sortedInterfaceTypes,
const Func<HashSet<IRInterfaceType*>, IRInterfaceType*>& getDependencies)
{
if (visited.contains(interfaceType))
return;
visited.add(interfaceType);
for (auto dependency : getDependencies(interfaceType))
{
_sortTopologically(dependency, visited, sortedInterfaceTypes, getDependencies);
}
sortedInterfaceTypes.add(interfaceType);
}
List<IRInterfaceType*> sortTopologically(
HashSet<IRInterfaceType*> interfaceTypes,
const Func<HashSet<IRInterfaceType*>, IRInterfaceType*>& getDependencies)
{
List<IRInterfaceType*> sortedInterfaceTypes;
HashSet<IRInterfaceType*> visited;
for (auto interfaceType : interfaceTypes)
{
_sortTopologically(interfaceType, visited, sortedInterfaceTypes, getDependencies);
}
return sortedInterfaceTypes;
}
void inferAnyValueSizeWhereNecessary(TargetProgram* targetProgram, IRModule* module)
{
// Go through the global insts and collect all interface types.
// For each interface type, infer its any-value-size, by looking up
// all witness tables whose conformance type matches the interface type.
// then using _calcNaturalSizeAndAlignment to find the max size.
//
// Note: we only infer any-value-size for interface types that are used
// as a generic type parameter, because we don't want to infer any-value-size
// for interface types that are used as a witness table type.
//
HashSet<IRInst*> implementedInterfaces;
// Add all interface type that are implemented by at least one type to a set.
for (auto inst : module->getGlobalInsts())
{
if (inst->getOp() == kIROp_WitnessTable)
{
auto interfaceType =
cast<IRWitnessTableType>(inst->getDataType())->getConformanceType();
implementedInterfaces.add(interfaceType);
}
}
// Collect all interface types that require inference.
HashSet<IRInterfaceType*> interfaceTypes;
for (auto inst : module->getGlobalInsts())
{
if (inst->getOp() == kIROp_InterfaceType)
{
auto interfaceType = cast<IRInterfaceType>(inst);
// Do not infer anything for COM interfaces.
if (isComInterfaceType((IRType*)interfaceType))
continue;
// Also skip builtin types.
if (interfaceType->findDecoration<IRBuiltinDecoration>())
continue;
// If the interface already has an explicit any-value-size, don't infer anything.
if (interfaceType->findDecoration<IRAnyValueSizeDecoration>())
continue;
// Skip interfaces that are not implemented by any type.
if (!implementedInterfaces.contains(interfaceType))
continue;
interfaceTypes.add(interfaceType);
}
}
Dictionary<IRInterfaceType*, List<IRInst*>> mapInterfaceToImplementations;
// Collect all concrete types that conform to this interface type.
for (auto interfaceType : interfaceTypes)
{
IRWitnessTableType* witnessTableType = nullptr;
// Find witness table type corresponding to this interface.
for (auto use = interfaceType->firstUse; use; use = use->nextUse)
{
if (auto _witnessTableType = as<IRWitnessTableType>(use->getUser()))
{
if (_witnessTableType->getConformanceType() == interfaceType &&
_witnessTableType->hasUses())
{
witnessTableType = _witnessTableType;
break;
}
}
}
// If we hit this case, we have an interface without any conforming implementations.
// This case should be handled before this point.
//
SLANG_ASSERT(witnessTableType);
List<IRInst*> implList;
// Walk through all the uses of this witness table type to find the witness tables.
for (auto use = witnessTableType->firstUse; use; use = use->nextUse)
{
auto witnessTable = as<IRWitnessTable>(use->getUser());
if (!witnessTable || witnessTable->getDataType() != witnessTableType)
continue;
auto concreteImpl = witnessTable->getConcreteType();
// Only consider implementations at the top-level (ignore those nested
// in generics)
//
if (concreteImpl->getParent() == module->getModuleInst())
implList.add(concreteImpl);
}
mapInterfaceToImplementations.add(interfaceType, implList);
}
Dictionary<IRInterfaceType*, HashSet<IRInterfaceType*>> interfaceDependencyMap;
// Collect dependencies for each interface.
for (auto interfaceType : interfaceTypes)
{
HashSet<IRInterfaceType*> dependencySet;
for (auto impl : mapInterfaceToImplementations[interfaceType])
{
auto dependencies = findDependenciesOfTypeInSet((IRType*)impl, interfaceTypes);
for (auto dependency : dependencies)
dependencySet.add(dependency);
}
interfaceDependencyMap.add(interfaceType, dependencySet);
}
// Sort the interface types in topological order.
// This is necessary because we need to infer the any-value-size of an interface type
// before we infer the any-value-size of an interface type that depends on it.
//
List<IRInterfaceType*> sortedInterfaceTypes = sortTopologically(
interfaceTypes,
[&](IRInterfaceType* interfaceType) { return interfaceDependencyMap[interfaceType]; });
for (auto interfaceType : sortedInterfaceTypes)
{
IRIntegerValue maxAnyValueSize = -1;
for (auto implType : mapInterfaceToImplementations[interfaceType])
{
IRSizeAndAlignment sizeAndAlignment;
getNaturalSizeAndAlignment(
targetProgram->getOptionSet(),
(IRType*)implType,
&sizeAndAlignment);
maxAnyValueSize = Math::Max(maxAnyValueSize, sizeAndAlignment.size);
}
// Should not encounter interface types without any conforming implementations.
SLANG_ASSERT(maxAnyValueSize >= 0);
// If we found a max size, add an any-value-size decoration to the interface type.
if (maxAnyValueSize >= 0)
{
IRBuilder builder(module);
builder.addAnyValueSizeDecoration(interfaceType, maxAnyValueSize);
}
}
}
}; // namespace Slang
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