1 //===- PtrUseVisitor.cpp - InstVisitors over a pointers uses --------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 /// \file 10 /// Implementation of the pointer use visitors. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/Analysis/PtrUseVisitor.h" 15 #include "llvm/IR/Instruction.h" 16 #include "llvm/IR/Instructions.h" 17 18 using namespace llvm; 19 20 void detail::PtrUseVisitorBase::enqueueUsers(Instruction &I) { 21 for (Use &U : I.uses()) { 22 if (VisitedUses.insert(&U).second) { 23 UseToVisit NewU = { 24 UseToVisit::UseAndIsOffsetKnownPair(&U, IsOffsetKnown), 25 Offset 26 }; 27 Worklist.push_back(std::move(NewU)); 28 } 29 } 30 } 31 32 bool detail::PtrUseVisitorBase::adjustOffsetForGEP(GetElementPtrInst &GEPI) { 33 if (!IsOffsetKnown) 34 return false; 35 36 APInt TmpOffset(DL.getIndexTypeSizeInBits(GEPI.getType()), 0); 37 if (GEPI.accumulateConstantOffset(DL, TmpOffset)) { 38 Offset += TmpOffset.sextOrTrunc(Offset.getBitWidth()); 39 return true; 40 } 41 42 return false; 43 } 44