llvm/llvm/include/llvm/CodeGen/CallingConvLower.h

//===- llvm/CallingConvLower.h - Calling Conventions ------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file declares the CCState and CCValAssign classes, used for lowering
// and implementing calling conventions.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_CALLINGCONVLOWER_H
#define LLVM_CODEGEN_CALLINGCONVLOWER_H

#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/Register.h"
#include "llvm/CodeGen/TargetCallingConv.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/Support/Alignment.h"
#include <variant>

namespace llvm {

class CCState;
class MachineFunction;
class MVT;
class TargetRegisterInfo;

/// CCValAssign - Represent assignment of one arg/retval to a location.
class CCValAssign { … };

/// Describes a register that needs to be forwarded from the prologue to a
/// musttail call.
struct ForwardedRegister { … };

/// CCAssignFn - This function assigns a location for Val, updating State to
/// reflect the change.  It returns 'true' if it failed to handle Val.
CCAssignFn;

/// CCCustomFn - This function assigns a location for Val, possibly updating
/// all args to reflect changes and indicates if it handled it. It must set
/// isCustom if it handles the arg and returns true.
CCCustomFn;

/// CCState - This class holds information needed while lowering arguments and
/// return values.  It captures which registers are already assigned and which
/// stack slots are used.  It provides accessors to allocate these values.
class CCState { … };

} // end namespace llvm

#endif // LLVM_CODEGEN_CALLINGCONVLOWER_H