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annotate lib/Transforms/IPO/BarrierNoopPass.cpp @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children c2174574ed3a
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1 //===- BarrierNoopPass.cpp - A barrier pass for the pass manager ----------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // NOTE: DO NOT USE THIS IF AVOIDABLE
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11 //
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12 // This pass is a nonce pass intended to allow manipulation of the implicitly
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13 // nesting pass manager. For example, it can be used to cause a CGSCC pass
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14 // manager to be closed prior to running a new collection of function passes.
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15 //
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16 // FIXME: This is a huge HACK. This should be removed when the pass manager's
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17 // nesting is made explicit instead of implicit.
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18 //
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19 //===----------------------------------------------------------------------===//
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20
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21 #include "llvm/Pass.h"
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22 #include "llvm/Transforms/IPO.h"
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23 using namespace llvm;
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24
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25 namespace {
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26 /// \brief A nonce module pass used to place a barrier in a pass manager.
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27 ///
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28 /// There is no mechanism for ending a CGSCC pass manager once one is started.
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29 /// This prevents extension points from having clear deterministic ordering
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30 /// when they are phrased as non-module passes.
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31 class BarrierNoop : public ModulePass {
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32 public:
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33 static char ID; // Pass identification.
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34
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35 BarrierNoop() : ModulePass(ID) {
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36 initializeBarrierNoopPass(*PassRegistry::getPassRegistry());
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37 }
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38
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39 bool runOnModule(Module &M) override { return false; }
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40 };
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41 }
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43 ModulePass *llvm::createBarrierNoopPass() { return new BarrierNoop(); }
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44
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45 char BarrierNoop::ID = 0;
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46 INITIALIZE_PASS(BarrierNoop, "barrier", "A No-Op Barrier Pass",
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47 false, false)