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comparison lib/Transforms/ObjCARC/ObjCARCAliasAnalysis.h @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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-1:000000000000 0:95c75e76d11b
1 //===- ObjCARCAliasAnalysis.h - ObjC ARC Optimization -*- C++ -*-----------===//
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 /// \file
10 /// This file declares a simple ARC-aware AliasAnalysis using special knowledge
11 /// of Objective C to enhance other optimization passes which rely on the Alias
12 /// Analysis infrastructure.
13 ///
14 /// WARNING: This file knows about certain library functions. It recognizes them
15 /// by name, and hardwires knowledge of their semantics.
16 ///
17 /// WARNING: This file knows about how certain Objective-C library functions are
18 /// used. Naive LLVM IR transformations which would otherwise be
19 /// behavior-preserving may break these assumptions.
20 ///
21 //===----------------------------------------------------------------------===//
22
23 #ifndef LLVM_TRANSFORMS_OBJCARC_OBJCARCALIASANALYSIS_H
24 #define LLVM_TRANSFORMS_OBJCARC_OBJCARCALIASANALYSIS_H
25
26 #include "llvm/Analysis/AliasAnalysis.h"
27 #include "llvm/Pass.h"
28
29 namespace llvm {
30 namespace objcarc {
31
32 /// \brief This is a simple alias analysis implementation that uses knowledge
33 /// of ARC constructs to answer queries.
34 ///
35 /// TODO: This class could be generalized to know about other ObjC-specific
36 /// tricks. Such as knowing that ivars in the non-fragile ABI are non-aliasing
37 /// even though their offsets are dynamic.
38 class ObjCARCAliasAnalysis : public ImmutablePass,
39 public AliasAnalysis {
40 public:
41 static char ID; // Class identification, replacement for typeinfo
42 ObjCARCAliasAnalysis() : ImmutablePass(ID) {
43 initializeObjCARCAliasAnalysisPass(*PassRegistry::getPassRegistry());
44 }
45
46 private:
47 virtual void initializePass() {
48 InitializeAliasAnalysis(this);
49 }
50
51 /// This method is used when a pass implements an analysis interface through
52 /// multiple inheritance. If needed, it should override this to adjust the
53 /// this pointer as needed for the specified pass info.
54 virtual void *getAdjustedAnalysisPointer(const void *PI) {
55 if (PI == &AliasAnalysis::ID)
56 return static_cast<AliasAnalysis *>(this);
57 return this;
58 }
59
60 virtual void getAnalysisUsage(AnalysisUsage &AU) const;
61 virtual AliasResult alias(const Location &LocA, const Location &LocB);
62 virtual bool pointsToConstantMemory(const Location &Loc, bool OrLocal);
63 virtual ModRefBehavior getModRefBehavior(ImmutableCallSite CS);
64 virtual ModRefBehavior getModRefBehavior(const Function *F);
65 virtual ModRefResult getModRefInfo(ImmutableCallSite CS,
66 const Location &Loc);
67 virtual ModRefResult getModRefInfo(ImmutableCallSite CS1,
68 ImmutableCallSite CS2);
69 };
70
71 } // namespace objcarc
72 } // namespace llvm
73
74 #endif // LLVM_TRANSFORMS_OBJCARC_OBJCARCALIASANALYSIS_H