reference, declarationdefinition
definition → references, declarations, derived classes, virtual overrides
reference to multiple definitions → definitions
unreferenced
    1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
//===- CallPromotionUtils.h - Utilities for call promotion ------*- 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 utilities useful for promoting indirect call sites to
// direct call sites.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_TRANSFORMS_UTILS_CALLPROMOTIONUTILS_H
#define LLVM_TRANSFORMS_UTILS_CALLPROMOTIONUTILS_H

#include "llvm/IR/CallSite.h"

namespace llvm {

/// Return true if the given indirect call site can be made to call \p Callee.
///
/// This function ensures that the number and type of the call site's arguments
/// and return value match those of the given function. If the types do not
/// match exactly, they must at least be bitcast compatible. If \p FailureReason
/// is non-null and the indirect call cannot be promoted, the failure reason
/// will be stored in it.
bool isLegalToPromote(CallSite CS, Function *Callee,
                      const char **FailureReason = nullptr);

/// Promote the given indirect call site to unconditionally call \p Callee.
///
/// This function promotes the given call site, returning the direct call or
/// invoke instruction. If the function type of the call site doesn't match that
/// of the callee, bitcast instructions are inserted where appropriate. If \p
/// RetBitCast is non-null, it will be used to store the return value bitcast,
/// if created.
Instruction *promoteCall(CallSite CS, Function *Callee,
                         CastInst **RetBitCast = nullptr);

/// Promote the given indirect call site to conditionally call \p Callee.
///
/// This function creates an if-then-else structure at the location of the call
/// site. The original call site is moved into the "else" block. A clone of the
/// indirect call site is promoted, placed in the "then" block, and returned. If
/// \p BranchWeights is non-null, it will be used to set !prof metadata on the
/// new conditional branch.
Instruction *promoteCallWithIfThenElse(CallSite CS, Function *Callee,
                                       MDNode *BranchWeights = nullptr);

} // end namespace llvm

#endif // LLVM_TRANSFORMS_UTILS_CALLPROMOTIONUTILS_H