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54 lines
2.4 KiB
C++
54 lines
2.4 KiB
C++
//===- CallPromotionUtils.h - Utilities for call promotion ------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares utilities useful for promoting indirect call sites to
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// direct call sites.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_CALLPROMOTIONUTILS_H
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#define LLVM_TRANSFORMS_UTILS_CALLPROMOTIONUTILS_H
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#include "llvm/IR/CallSite.h"
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namespace llvm {
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/// Return true if the given indirect call site can be made to call \p Callee.
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///
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/// This function ensures that the number and type of the call site's arguments
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/// and return value match those of the given function. If the types do not
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/// match exactly, they must at least be bitcast compatible. If \p FailureReason
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/// is non-null and the indirect call cannot be promoted, the failure reason
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/// will be stored in it.
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bool isLegalToPromote(CallSite CS, Function *Callee,
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const char **FailureReason = nullptr);
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/// Promote the given indirect call site to unconditionally call \p Callee.
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///
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/// This function promotes the given call site, returning the direct call or
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/// invoke instruction. If the function type of the call site doesn't match that
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/// of the callee, bitcast instructions are inserted where appropriate. If \p
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/// RetBitCast is non-null, it will be used to store the return value bitcast,
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/// if created.
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Instruction *promoteCall(CallSite CS, Function *Callee,
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CastInst **RetBitCast = nullptr);
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/// Promote the given indirect call site to conditionally call \p Callee.
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///
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/// This function creates an if-then-else structure at the location of the call
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/// site. The original call site is moved into the "else" block. A clone of the
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/// indirect call site is promoted, placed in the "then" block, and returned. If
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/// \p BranchWeights is non-null, it will be used to set !prof metadata on the
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/// new conditional branch.
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Instruction *promoteCallWithIfThenElse(CallSite CS, Function *Callee,
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MDNode *BranchWeights = nullptr);
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} // end namespace llvm
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#endif // LLVM_TRANSFORMS_UTILS_CALLPROMOTIONUTILS_H
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