lib/Analysis/PtrUseVisitor.cpp

   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 //
  10 /// \file
  11 /// Implementation of the pointer use visitors.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/Analysis/PtrUseVisitor.h"
  16 #include "llvm/IR/Instruction.h"
  17 #include "llvm/IR/Instructions.h"
  18 #include <algorithm>
  19
  20 using namespace llvm;
  21
  22 void detail::PtrUseVisitorBase::enqueueUsers(Instruction &I) {
  23   for (Use &U : I.uses()) {
  24     if (VisitedUses.insert(&U).second) {
  25       UseToVisit NewU = {
  26         UseToVisit::UseAndIsOffsetKnownPair(&U, IsOffsetKnown),
  27         Offset
  28       };
  29       Worklist.push_back(std::move(NewU));
  30     }
  31   }
  32 }
  33
  34 bool detail::PtrUseVisitorBase::adjustOffsetForGEP(GetElementPtrInst &GEPI) {
  35   if (!IsOffsetKnown)
  36     return false;
  37
  38   return GEPI.accumulateConstantOffset(DL, Offset);
  39 }