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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_GLOBALISEL_GISELCHANGEOBSERVER_H
#define RCC_CODEGEN_GLOBALISEL_GISELCHANGEOBSERVER_H
#include "rcc/CodeGen/MachineFunction.h"
#include <span>
#include <vector>
namespace rcc {
class MachineInstr;
class GISelChangeObserver {
public:
virtual ~GISelChangeObserver() = default;
virtual void erasingInstr(MachineInstr &Instruction) = 0;
virtual void createdInstr(MachineInstr &Instruction) = 0;
virtual void changingInstr(MachineInstr &Instruction) = 0;
virtual void changedInstr(MachineInstr &Instruction) = 0;
};
class GISelObserverWrapper final : public MachineFunction::Delegate,
public GISelChangeObserver {
public:
GISelObserverWrapper() = default;
explicit GISelObserverWrapper(GISelChangeObserver &Observer) {
Observers.push_back(&Observer);
}
explicit GISelObserverWrapper(std::span<GISelChangeObserver *const> InitialObservers)
: Observers(InitialObservers.begin(), InitialObservers.end()) {}
void addObserver(GISelChangeObserver &Observer);
void removeObserver(GISelChangeObserver &Observer);
void clearObservers() noexcept;
void erasingInstr(MachineInstr &Instruction) override;
void createdInstr(MachineInstr &Instruction) override;
void changingInstr(MachineInstr &Instruction) override;
void changedInstr(MachineInstr &Instruction) override;
void handleInsertion(MachineInstr &Instruction) override;
void handleRemoval(MachineInstr &Instruction) override;
private:
std::vector<GISelChangeObserver *> Observers;
};
class MachineFunctionDelegateInstaller final {
public:
MachineFunctionDelegateInstaller(MachineFunction &Function,
MachineFunction::Delegate &Delegate);
MachineFunctionDelegateInstaller(const MachineFunctionDelegateInstaller &) = delete;
MachineFunctionDelegateInstaller &operator=(const MachineFunctionDelegateInstaller &) = delete;
~MachineFunctionDelegateInstaller();
private:
MachineFunction *Function;
MachineFunction::Delegate *Delegate;
};
} // namespace rcc
#endif // RCC_CODEGEN_GLOBALISEL_GISELCHANGEOBSERVER_H
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