| 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(Ptr: &U).second) { |
| 23 | UseToVisit NewU = { |
| 24 | .UseAndIsOffsetKnown: UseToVisit::UseAndIsOffsetKnownPair(&U, IsOffsetKnown), |
| 25 | .Offset: Offset |
| 26 | }; |
| 27 | Worklist.push_back(Elt: 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(Ty: GEPI.getType()), 0); |
| 37 | if (GEPI.accumulateConstantOffset(DL, Offset&: TmpOffset)) { |
| 38 | Offset += TmpOffset.sextOrTrunc(width: Offset.getBitWidth()); |
| 39 | return true; |
| 40 | } |
| 41 | |
| 42 | return false; |
| 43 | } |
| 44 |