79 lines
3.4 KiB
C
79 lines
3.4 KiB
C
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//===- 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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namespace llvm {
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class CallBase;
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class CastInst;
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class Function;
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class MDNode;
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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(const CallBase &CB, 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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CallBase &promoteCall(CallBase &CB, 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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CallBase &promoteCallWithIfThenElse(CallBase &CB, Function *Callee,
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MDNode *BranchWeights = nullptr);
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/// Try to promote (devirtualize) a virtual call on an Alloca. Return true on
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/// success.
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///
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/// Look for a pattern like:
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///
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/// %o = alloca %class.Impl
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/// %1 = getelementptr %class.Impl, %class.Impl* %o, i64 0, i32 0, i32 0
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/// store i32 (...)** bitcast (i8** getelementptr inbounds
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/// ({ [3 x i8*] }, { [3 x i8*] }* @_ZTV4Impl, i64 0, inrange i32 0, i64 2)
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/// to i32 (...)**), i32 (...)*** %1
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/// %2 = getelementptr inbounds %class.Impl, %class.Impl* %o, i64 0, i32 0
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/// %3 = bitcast %class.Interface* %2 to void (%class.Interface*)***
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/// %vtable.i = load void (%class.Interface*)**, void (%class.Interface*)*** %3
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/// %4 = load void (%class.Interface*)*, void (%class.Interface*)** %vtable.i
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/// call void %4(%class.Interface* nonnull %2)
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///
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/// @_ZTV4Impl = linkonce_odr dso_local unnamed_addr constant { [3 x i8*] }
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/// { [3 x i8*]
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/// [i8* null, i8* bitcast ({ i8*, i8*, i8* }* @_ZTI4Impl to i8*),
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/// i8* bitcast (void (%class.Impl*)* @_ZN4Impl3RunEv to i8*)] }
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///
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bool tryPromoteCall(CallBase &CB);
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} // end namespace llvm
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#endif // LLVM_TRANSFORMS_UTILS_CALLPROMOTIONUTILS_H
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