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annotate lib/Transforms/ObjCARC/ProvenanceAnalysis.h @ 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 afa8332a0e37
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1 //===- ProvenanceAnalysis.h - ObjC ARC Optimization ---*- C++ -*-----------===//
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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 /// \file
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10 ///
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11 /// This file declares a special form of Alias Analysis called ``Provenance
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12 /// Analysis''. The word ``provenance'' refers to the history of the ownership
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13 /// of an object. Thus ``Provenance Analysis'' is an analysis which attempts to
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14 /// use various techniques to determine if locally
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15 ///
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16 /// WARNING: This file knows about certain library functions. It recognizes them
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17 /// by name, and hardwires knowledge of their semantics.
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18 ///
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19 /// WARNING: This file knows about how certain Objective-C library functions are
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20 /// used. Naive LLVM IR transformations which would otherwise be
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21 /// behavior-preserving may break these assumptions.
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22 ///
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23 //===----------------------------------------------------------------------===//
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24
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25 #ifndef LLVM_LIB_TRANSFORMS_OBJCARC_PROVENANCEANALYSIS_H
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26 #define LLVM_LIB_TRANSFORMS_OBJCARC_PROVENANCEANALYSIS_H
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27
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28 #include "llvm/ADT/DenseMap.h"
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29
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30 namespace llvm {
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31 class Value;
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32 class AliasAnalysis;
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33 class PHINode;
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34 class SelectInst;
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35 }
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36
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37 namespace llvm {
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38 namespace objcarc {
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39
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40 /// \brief This is similar to BasicAliasAnalysis, and it uses many of the same
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41 /// techniques, except it uses special ObjC-specific reasoning about pointer
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42 /// relationships.
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43 ///
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44 /// In this context ``Provenance'' is defined as the history of an object's
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45 /// ownership. Thus ``Provenance Analysis'' is defined by using the notion of
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46 /// an ``independent provenance source'' of a pointer to determine whether or
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47 /// not two pointers have the same provenance source and thus could
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48 /// potentially be related.
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49 class ProvenanceAnalysis {
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50 AliasAnalysis *AA;
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51
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52 typedef std::pair<const Value *, const Value *> ValuePairTy;
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53 typedef DenseMap<ValuePairTy, bool> CachedResultsTy;
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54 CachedResultsTy CachedResults;
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55
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56 bool relatedCheck(const Value *A, const Value *B);
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57 bool relatedSelect(const SelectInst *A, const Value *B);
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58 bool relatedPHI(const PHINode *A, const Value *B);
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59
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60 void operator=(const ProvenanceAnalysis &) = delete;
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61 ProvenanceAnalysis(const ProvenanceAnalysis &) = delete;
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63 public:
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64 ProvenanceAnalysis() {}
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65
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66 void setAA(AliasAnalysis *aa) { AA = aa; }
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67
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68 AliasAnalysis *getAA() const { return AA; }
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69
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70 bool related(const Value *A, const Value *B);
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71
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72 void clear() {
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73 CachedResults.clear();
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74 }
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75 };
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76
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77 } // end namespace objcarc
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78 } // end namespace llvm
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80 #endif