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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_REACHINGDEFANALYSIS_H
#define RCC_CODEGEN_REACHINGDEFANALYSIS_H
#include "rcc/CodeGen/MachineFunctionAnalysisManager.h"
#include "rcc/Support/Error.h"
#include <cstddef>
#include <span>
#include <string_view>
#include <unordered_map>
#include <vector>
namespace rcc {
class MachineFunction;
class MachineInstr;
class MachineOperand;
class TargetDescription;
class ReachingDefAnalysis final {
public:
using DefinitionSet = std::vector<const MachineInstr *>;
class Result final {
public:
[[nodiscard]] std::span<const MachineInstr *const>
reachingDefinitions(const MachineOperand &Operand) const noexcept;
[[nodiscard]] std::size_t instructionNumber(const MachineInstr &Instruction) const noexcept;
[[nodiscard]] bool invalidate(const MachineFunction &,
const PreservedAnalyses &Preserved) const noexcept;
private:
std::unordered_map<const MachineOperand *, DefinitionSet> OperandDefinitions;
std::unordered_map<const MachineInstr *, std::size_t> InstructionNumbers;
friend class ReachingDefAnalysis;
};
[[nodiscard]] static constexpr std::string_view name() noexcept {
return "ReachingDefAnalysis";
}
[[nodiscard]] static Expected<Result> run(MachineFunction &Function,
const TargetDescription &Target,
MachineFunctionAnalysisManager &Analyses);
};
} // namespace rcc
#endif // RCC_CODEGEN_REACHINGDEFANALYSIS_H
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