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// Copyright (c) 2024 Epic Games, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SOURCE_OPT_STRUCT_PACKING_PASS_
#define SOURCE_OPT_STRUCT_PACKING_PASS_
#include <unordered_map>
#include "source/opt/ir_context.h"
#include "source/opt/module.h"
#include "source/opt/pass.h"
namespace spvtools {
namespace opt {
// This pass re-assigns all field offsets under the specified packing rules.
class StructPackingPass final : public Pass {
public:
enum class PackingRules {
Undefined,
Std140,
Std140EnhancedLayout,
Std430,
Std430EnhancedLayout,
HlslCbuffer,
HlslCbufferPackOffset,
Scalar,
ScalarEnhancedLayout,
};
static PackingRules ParsePackingRuleFromString(const std::string& s);
StructPackingPass(const char* structToPack, PackingRules rules);
const char* name() const override { return "struct-packing"; }
Status Process() override;
IRContext::Analysis GetPreservedAnalyses() override {
return IRContext::kAnalysisCombinators | IRContext::kAnalysisCFG |
IRContext::kAnalysisDominatorAnalysis |
IRContext::kAnalysisLoopAnalysis | IRContext::kAnalysisNameMap |
IRContext::kAnalysisScalarEvolution |
IRContext::kAnalysisStructuredCFG | IRContext::kAnalysisConstants |
IRContext::kAnalysisDebugInfo | IRContext::kAnalysisLiveness;
}
private:
void buildConstantsMap();
uint32_t findStructIdByName(const char* structName) const;
std::vector<const analysis::Type*> findStructMemberTypes(
const Instruction& structDef) const;
Status assignStructMemberOffsets(
uint32_t structIdToPack,
const std::vector<const analysis::Type*>& structMemberTypes);
uint32_t getPackedAlignment(const analysis::Type& type) const;
uint32_t getPackedSize(const analysis::Type& type) const;
uint32_t getPackedArrayStride(const analysis::Array& arrayType) const;
uint32_t getArrayLength(const analysis::Array& arrayType) const;
uint32_t getConstantInt(spv::Id id) const;
private:
std::string structToPack_;
PackingRules packingRules_ = PackingRules::Undefined;
std::unordered_map<spv::Id, Instruction*> constantsMap_;
};
} // namespace opt
} // namespace spvtools
#endif // SOURCE_OPT_STRUCT_PACKING_PASS_
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