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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_TARGETFRAMELOWERING_H
#define RCC_CODEGEN_TARGETFRAMELOWERING_H
#include "rcc/CodeGen/MachineIRTypes.h"
#include "rcc/CodeGen/Register.h"
#include "rcc/Support/Error.h"
#include <cstddef>
#include <cstdint>
namespace rcc {
class MachineBasicBlock;
class MachineFunction;
class MachineInstr;
class RegisterScavenger;
class TargetDescription;
struct FrameIndexReference final {
PhysicalRegister BaseRegister;
std::int64_t Offset = 0;
};
struct FrameLoweringOptions final {
bool EmitDebugOutput = false;
};
class TargetFrameLowering {
public:
virtual ~TargetFrameLowering() = default;
[[nodiscard]] virtual PhysicalRegister
initialCFARegister(const MachineFunction &Function,
const TargetDescription &Target) const noexcept = 0;
[[nodiscard]] virtual std::int64_t initialCFAOffset(const MachineFunction &) const noexcept {
return 0;
}
[[nodiscard]] virtual Expected<void> prepareFrame(MachineFunction &Function,
const TargetDescription &Target,
FrameLoweringOptions Options = {}) const = 0;
[[nodiscard]] virtual Expected<void>
insertCalleeSavedSpillsAndRestores(MachineFunction &Function,
const TargetDescription &Target) const = 0;
[[nodiscard]] virtual Expected<void>
processFunctionBeforeFrameFinalized(MachineFunction &, const TargetDescription &) const {
return {};
}
[[nodiscard]] virtual Expected<void> finalizeFrame(MachineFunction &Function,
const TargetDescription &Target) const = 0;
[[nodiscard]] virtual bool isCalleeSavedRegister(PhysicalRegister, const MachineFunction &,
const TargetDescription &) const noexcept {
return false;
}
[[nodiscard]] virtual bool isCallFramePseudo(const MachineInstr &Instruction) const noexcept = 0;
[[nodiscard]] virtual Expected<void>
eliminateCallFramePseudo(MachineInstr &Instruction, MachineFunction &Function,
const TargetDescription &Target, RegisterScavenger &Scavenger) const = 0;
[[nodiscard]] virtual Expected<void> emitPrologue(MachineFunction &Function,
const TargetDescription &Target,
RegisterScavenger &Scavenger) const = 0;
[[nodiscard]] virtual bool
isEpilogueTerminator(const MachineInstr &Instruction,
const TargetDescription &Target) const noexcept = 0;
[[nodiscard]] virtual Expected<void>
emitEpilogue(MachineBasicBlock &Block, MachineInstr &Terminator, MachineFunction &Function,
const TargetDescription &Target, RegisterScavenger &Scavenger) const = 0;
[[nodiscard]] virtual Expected<void>
processFunctionBeforeFrameIndexElimination(MachineFunction &, const TargetDescription &) const {
return {};
}
[[nodiscard]] virtual Expected<FrameIndexReference>
getFrameIndexReference(const MachineFunction &Function, const MachineInstr &Instruction,
FrameIndex Index, std::int64_t OperandOffset) const = 0;
[[nodiscard]] virtual Expected<void> eliminateFrameIndex(MachineInstr &Instruction,
std::size_t OperandIndex,
MachineFunction &Function,
const TargetDescription &Target,
RegisterScavenger &Scavenger) const = 0;
};
} // namespace rcc
#endif // RCC_CODEGEN_TARGETFRAMELOWERING_H
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