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36b699f2b1
This requires a number of steps. 1) Move value_use_iterator into the Value class as an implementation detail 2) Change it to actually be a *Use* iterator rather than a *User* iterator. 3) Add an adaptor which is a User iterator that always looks through the Use to the User. 4) Wrap these in Value::use_iterator and Value::user_iterator typedefs. 5) Add the range adaptors as Value::uses() and Value::users(). 6) Update *all* of the callers to correctly distinguish between whether they wanted a use_iterator (and to explicitly dig out the User when needed), or a user_iterator which makes the Use itself totally opaque. Because #6 requires churning essentially everything that walked the Use-Def chains, I went ahead and added all of the range adaptors and switched them to range-based loops where appropriate. Also because the renaming requires at least churning every line of code, it didn't make any sense to split these up into multiple commits -- all of which would touch all of the same lies of code. The result is still not quite optimal. The Value::use_iterator is a nice regular iterator, but Value::user_iterator is an iterator over User*s rather than over the User objects themselves. As a consequence, it fits a bit awkwardly into the range-based world and it has the weird extra-dereferencing 'operator->' that so many of our iterators have. I think this could be fixed by providing something which transforms a range of T&s into a range of T*s, but that *can* be separated into another patch, and it isn't yet 100% clear whether this is the right move. However, this change gets us most of the benefit and cleans up a substantial amount of code around Use and User. =] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203364 91177308-0d34-0410-b5e6-96231b3b80d8
36 lines
1018 B
C++
36 lines
1018 B
C++
//===- PtrUseVisitor.cpp - InstVisitors over a pointers uses --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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/// \file
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/// Implementation of the pointer use visitors.
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///
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/PtrUseVisitor.h"
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using namespace llvm;
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void detail::PtrUseVisitorBase::enqueueUsers(Instruction &I) {
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for (Use &U : I.uses()) {
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if (VisitedUses.insert(&U)) {
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UseToVisit NewU = {
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UseToVisit::UseAndIsOffsetKnownPair(&U, IsOffsetKnown),
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Offset
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};
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Worklist.push_back(std::move(NewU));
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}
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}
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}
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bool detail::PtrUseVisitorBase::adjustOffsetForGEP(GetElementPtrInst &GEPI) {
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if (!IsOffsetKnown)
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return false;
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return GEPI.accumulateConstantOffset(DL, Offset);
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}
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