PtrUseVisitor.cpp revision 36b56886974eae4f9c5ebc96befd3e7bfe5de338 
1//===- PtrUseVisitor.cpp - InstVisitors over a pointers uses --------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9/// \file
10/// Implementation of the pointer use visitors.
11///
12//===----------------------------------------------------------------------===//
13
14#include "llvm/Analysis/PtrUseVisitor.h"
15
16using namespace llvm;
17
18void detail::PtrUseVisitorBase::enqueueUsers(Instruction &I) {
19  for (Use &U : I.uses()) {
20    if (VisitedUses.insert(&U)) {
21      UseToVisit NewU = {
22        UseToVisit::UseAndIsOffsetKnownPair(&U, IsOffsetKnown),
23        Offset
24      };
25      Worklist.push_back(std::move(NewU));
26    }
27  }
28}
29
30bool detail::PtrUseVisitorBase::adjustOffsetForGEP(GetElementPtrInst &GEPI) {
31  if (!IsOffsetKnown)
32    return false;
33
34  return GEPI.accumulateConstantOffset(DL, Offset);
35}
36