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annotate lib/Transforms/ObjCARC/ObjCARCAliasAnalysis.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
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1 //===- ObjCARCAliasAnalysis.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 /// This file declares a simple ARC-aware AliasAnalysis using special knowledge
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11 /// of Objective C to enhance other optimization passes which rely on the Alias
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12 /// Analysis infrastructure.
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13 ///
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14 /// WARNING: This file knows about certain library functions. It recognizes them
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15 /// by name, and hardwires knowledge of their semantics.
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16 ///
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17 /// WARNING: This file knows about how certain Objective-C library functions are
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18 /// used. Naive LLVM IR transformations which would otherwise be
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19 /// behavior-preserving may break these assumptions.
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20 ///
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21 //===----------------------------------------------------------------------===//
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22
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23 #ifndef LLVM_LIB_TRANSFORMS_OBJCARC_OBJCARCALIASANALYSIS_H
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24 #define LLVM_LIB_TRANSFORMS_OBJCARC_OBJCARCALIASANALYSIS_H
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25
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26 #include "llvm/Analysis/AliasAnalysis.h"
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27 #include "llvm/Pass.h"
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28
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29 namespace llvm {
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30 namespace objcarc {
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31
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32 /// \brief This is a simple alias analysis implementation that uses knowledge
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33 /// of ARC constructs to answer queries.
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34 ///
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35 /// TODO: This class could be generalized to know about other ObjC-specific
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36 /// tricks. Such as knowing that ivars in the non-fragile ABI are non-aliasing
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37 /// even though their offsets are dynamic.
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38 class ObjCARCAliasAnalysis : public ImmutablePass,
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39 public AliasAnalysis {
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40 public:
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41 static char ID; // Class identification, replacement for typeinfo
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42 ObjCARCAliasAnalysis() : ImmutablePass(ID) {
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43 initializeObjCARCAliasAnalysisPass(*PassRegistry::getPassRegistry());
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44 }
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45
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46 private:
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47 void initializePass() override {
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48 InitializeAliasAnalysis(this);
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49 }
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50
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51 /// This method is used when a pass implements an analysis interface through
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52 /// multiple inheritance. If needed, it should override this to adjust the
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53 /// this pointer as needed for the specified pass info.
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54 void *getAdjustedAnalysisPointer(const void *PI) override {
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55 if (PI == &AliasAnalysis::ID)
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56 return static_cast<AliasAnalysis *>(this);
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57 return this;
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58 }
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59
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60 void getAnalysisUsage(AnalysisUsage &AU) const override;
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61 AliasResult alias(const Location &LocA, const Location &LocB) override;
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62 bool pointsToConstantMemory(const Location &Loc, bool OrLocal) override;
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63 ModRefBehavior getModRefBehavior(ImmutableCallSite CS) override;
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64 ModRefBehavior getModRefBehavior(const Function *F) override;
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65 ModRefResult getModRefInfo(ImmutableCallSite CS,
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66 const Location &Loc) override;
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67 ModRefResult getModRefInfo(ImmutableCallSite CS1,
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68 ImmutableCallSite CS2) override;
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69 };
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70
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71 } // namespace objcarc
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72 } // namespace llvm
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73
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74 #endif