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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_TARGETBRANCHINFO_H
#define RCC_CODEGEN_TARGETBRANCHINFO_H
#include "rcc/Support/Error.h"
#include <cstdint>
#include <optional>
namespace rcc {
class MachineBasicBlock;
class MachineFunction;
class MachineInstr;
class TargetDescription;
struct MachineBranchAnalysis final {
MachineInstr *Conditional = nullptr;
MachineInstr *Unconditional = nullptr;
MachineBasicBlock *TrueTarget = nullptr;
MachineBasicBlock *FalseTarget = nullptr;
bool HasUnanalyzableTerminator = false;
};
class TargetBranchInfo {
public:
virtual ~TargetBranchInfo() = default;
[[nodiscard]] virtual Expected<MachineBranchAnalysis>
analyzeBranch(MachineBasicBlock &Block, MachineFunction &Function,
const TargetDescription &Target) const = 0;
[[nodiscard]] virtual Expected<void>
reverseBranchCondition(MachineInstr &Branch, MachineBasicBlock &NewTarget,
MachineFunction &Function, const TargetDescription &Target) const = 0;
[[nodiscard]] virtual Expected<void> removeBranch(MachineInstr &Branch, MachineFunction &Function,
const TargetDescription &Target) const = 0;
[[nodiscard]] virtual Expected<bool>
rewriteBranchTarget(MachineBasicBlock &Block, MachineBasicBlock &OldTarget,
MachineBasicBlock &NewTarget, MachineFunction &Function,
const TargetDescription &Target) const = 0;
[[nodiscard]] virtual Expected<MachineInstr *>
insertUnconditionalBranch(MachineBasicBlock &Block, MachineBasicBlock &TargetBlock,
MachineFunction &Function, const TargetDescription &Target) const = 0;
[[nodiscard]] virtual Expected<std::uint32_t>
instructionSize(const MachineInstr &Instruction, const MachineFunction &Function,
const TargetDescription &Target) const = 0;
[[nodiscard]] virtual Expected<MachineBasicBlock *>
branchTarget(MachineInstr &Instruction, MachineFunction &Function,
const TargetDescription &Target) const = 0;
[[nodiscard]] virtual Expected<std::optional<bool>>
evaluateBranchCondition(const MachineInstr &, const MachineFunction &,
const TargetDescription &) const {
return std::optional<bool>{};
}
[[nodiscard]] virtual bool isBranchOffsetInRange(const MachineInstr &Instruction,
std::int64_t Offset) const noexcept = 0;
[[nodiscard]] virtual Expected<bool> relaxBranch(MachineInstr &Instruction, std::int64_t Offset,
MachineFunction &Function,
const TargetDescription &Target) const = 0;
};
} // namespace rcc
#endif // RCC_CODEGEN_TARGETBRANCHINFO_H
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