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// Copyright (c) 2022 The Khronos Group Inc.
// Copyright (c) 2022 LunarG 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_LIVENESS_H_
#define SOURCE_OPT_LIVENESS_H_
#include <cstdint>
#include <unordered_set>
namespace spvtools {
namespace opt {
class IRContext;
class Instruction;
namespace analysis {
class Type;
// This class represents the liveness of the input variables of a module
class LivenessManager {
public:
LivenessManager(IRContext* ctx);
// Copy liveness info into |live_locs| and |builtin_locs|.
void GetLiveness(std::unordered_set<uint32_t>* live_locs,
std::unordered_set<uint32_t>* live_builtins);
// Return true if builtin |bi| is being analyzed.
bool IsAnalyzedBuiltin(uint32_t bi);
// Determine starting loc |offset| and the type |cur_type| of
// access chain |ac|. Set |no_loc| to true if no loc found.
// |is_patch| indicates if patch variable. |input| is true
// if input variable, otherwise output variable.
void AnalyzeAccessChainLoc(const Instruction* ac,
const analysis::Type** curr_type, uint32_t* offset,
bool* no_loc, bool is_patch, bool input = true);
// Return size of |type_id| in units of locations
uint32_t GetLocSize(const analysis::Type* type) const;
private:
IRContext* context() const { return ctx_; }
// Initialize analysis
void InitializeAnalysis();
// Analyze |id| for builtin var and struct members. Return true if builtins
// found.
bool AnalyzeBuiltIn(uint32_t id);
// Mark all live locations resulting from |user| of |var| at |loc|.
void MarkRefLive(const Instruction* user, Instruction* var);
// Mark |count| locations starting at location |start|.
void MarkLocsLive(uint32_t start, uint32_t count);
// Return type of component of aggregate type |agg_type| at |index|
const analysis::Type* GetComponentType(uint32_t index,
const analysis::Type* agg_type) const;
// Return offset of |index| into aggregate type |agg_type| in units of
// input locations
uint32_t GetLocOffset(uint32_t index, const analysis::Type* agg_type) const;
// Populate live_locs_ and live_builtins_
void ComputeLiveness();
// IR context that owns this liveness manager.
IRContext* ctx_;
// True if live_locs_ and live_builtins_ are computed
bool computed_;
// Live locations
std::unordered_set<uint32_t> live_locs_;
// Live builtins
std::unordered_set<uint32_t> live_builtins_;
};
} // namespace analysis
} // namespace opt
} // namespace spvtools
#endif // SOURCE_OPT_LIVENESS_H_
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