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#include "slang-ir-layout-on-types.h"
#include "slang-ir-insts.h"
#include "slang-ir.h"
namespace Slang
{
struct TypeTypeLayout
{
IRType* type;
IRTypeLayout* layout;
};
template<typename Struct, typename StructuredBuffer, typename Array, typename Base>
static void zipPreorderTypeAndTypeLayout(
Struct struct_,
StructuredBuffer structuredBuffer,
Array array,
Base base,
IRType* type,
IRTypeLayout* layout)
{
auto go = [&](auto& go, IRType* type, IRLayout* layout) -> void{
if(const auto structTypeLayout = as<IRStructTypeLayout>(layout))
{
const auto structType = as<IRStructType>(type);
SLANG_ASSERT(structType);
struct_(structType, structTypeLayout);
Index i = 0;
for(const auto field : structType->getFields())
{
const auto fieldVarLayout = structTypeLayout->getFieldLayout(i);
const auto fieldTypeLayout = fieldVarLayout->getTypeLayout();
const auto fieldType = field->getFieldType();
go(go, fieldType, fieldTypeLayout);
++i;
}
}
else if(const auto structuredBufferTypeLayout = as<IRStructuredBufferTypeLayout>(layout))
{
const auto structuredBufferType = as<IRHLSLStructuredBufferTypeBase>(type);
SLANG_ASSERT(structuredBufferType);
structuredBuffer(structuredBufferType, structuredBufferTypeLayout);
go(go, structuredBufferType->getElementType(), structuredBufferTypeLayout->getElementTypeLayout());
}
else if(const auto arrayTypeLayout = as<IRArrayTypeLayout>(layout))
{
const auto arrayType = as<IRArrayTypeBase>(type);
SLANG_ASSERT(arrayType);
array(arrayType , arrayTypeLayout);
go(go, arrayType->getElementType(), arrayTypeLayout->getElementTypeLayout());
}
else if(const auto existentialTypeLayout = as<IRExistentialTypeLayout>(layout))
{
// TODO: To resolve this we should
// - Record the interface width in each IRExistentialTypeLayout
// - To allow us to replace them with IRTupleTypeLayout when we lower existentials
// - To allow us to replace them with IRStructTypeLayout when we lower tuples
SLANG_UNEXPECTED("Existentials (or their layouts) have not been erased before SPIR-V emit");
}
else
{
base((IRType*)type, (IRTypeLayout*)layout);
}
};
go(go, type, layout);
}
static Dictionary<IRType*, IRTypeLayout*> associateTypesWithLayouts(IRModule* module)
{
List<TypeTypeLayout> worklist;
for(auto globalInst : module->getGlobalInsts())
{
if(const auto varLayout = as<IRVarLayout>(globalInst))
{
auto typeLayout = varLayout->getTypeLayout();
List<IRInst*> vars;
traverseUsers(varLayout, [&](IRInst* varLayoutUser){
if(const auto dec = as<IRLayoutDecoration>(varLayoutUser))
{
if(const auto globalParam = as<IRGlobalParam>(dec->getParent()))
vars.add(globalParam);
else
{
// todo
}
}
else if(as<IREntryPointLayout>(varLayoutUser))
{
// todo
}
else if(as<IRStructFieldLayoutAttr>(varLayoutUser))
{
// todo
}
else if(as<IRParameterGroupTypeLayout>(varLayoutUser))
{
// todo
}
else
SLANG_UNEXPECTED("Var layout was used somewhere unexpected");
});
if(vars.getCount() == 1)
{
auto type = vars[0]->getDataType();
worklist.add({type, typeLayout});
}
else if(vars.getCount() > 2)
{
SLANG_UNIMPLEMENTED_X("vars with different layouts");
}
}
}
Dictionary<IRType*, IRTypeLayout*> ret;
while(!worklist.getCount() == 0)
{
const auto ttl = worklist.getLast();
worklist.removeLast();
const auto add = [&](IRType* type, IRTypeLayout* typeLayout){
const auto* otherTypeLayout = ret.tryGetValueOrAdd(type, typeLayout);
if(otherTypeLayout)
SLANG_ASSERT(*otherTypeLayout == typeLayout);
};
zipPreorderTypeAndTypeLayout(add, add, add, add, ttl.type, ttl.layout);
}
return ret;
}
static void decorateTypesWithLayouts(IRModule* module, const Dictionary<IRType*, IRTypeLayout*>& assocs)
{
IRBuilder builder(module);
for(const auto& [type, layout] : assocs)
{
builder.setInsertBefore(type);
// TODO: types with more than one decoration (needs deduplicating)
builder.addLayoutDecoration(type, layout);
}
}
void placeTypeLayoutsOnTypes(IRModule* module, CodeGenContext* codeGenContext)
{
SLANG_ASSERT(module);
SLANG_ASSERT(codeGenContext);
const auto assocs = associateTypesWithLayouts(module);
decorateTypesWithLayouts(module, assocs);
}
}
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