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1 //===- LibCallAliasAnalysis.h - Implement AliasAnalysis for libcalls ------===//
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 //
10 // This file defines the LibCallAliasAnalysis class.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_ANALYSIS_LIBCALL_AA_H
15 #define LLVM_ANALYSIS_LIBCALL_AA_H
16 
17 #include "llvm/Analysis/AliasAnalysis.h"
18 #include "llvm/Pass.h"
19 
20 namespace llvm {
21   class LibCallInfo;
22   struct LibCallFunctionInfo;
23 
24   /// LibCallAliasAnalysis - Alias analysis driven from LibCallInfo.
25   struct LibCallAliasAnalysis : public FunctionPass, public AliasAnalysis {
26     static char ID; // Class identification
27 
28     LibCallInfo *LCI;
29 
30     explicit LibCallAliasAnalysis(LibCallInfo *LC = 0)
FunctionPassLibCallAliasAnalysis31         : FunctionPass(ID), LCI(LC) {
32       initializeLibCallAliasAnalysisPass(*PassRegistry::getPassRegistry());
33     }
LibCallAliasAnalysisLibCallAliasAnalysis34     explicit LibCallAliasAnalysis(char &ID, LibCallInfo *LC)
35         : FunctionPass(ID), LCI(LC) {
36       initializeLibCallAliasAnalysisPass(*PassRegistry::getPassRegistry());
37     }
38     ~LibCallAliasAnalysis();
39 
40     ModRefResult getModRefInfo(ImmutableCallSite CS,
41                                const Location &Loc);
42 
getModRefInfoLibCallAliasAnalysis43     ModRefResult getModRefInfo(ImmutableCallSite CS1,
44                                ImmutableCallSite CS2) {
45       // TODO: Could compare two direct calls against each other if we cared to.
46       return AliasAnalysis::getModRefInfo(CS1, CS2);
47     }
48 
49     virtual void getAnalysisUsage(AnalysisUsage &AU) const;
50 
runOnFunctionLibCallAliasAnalysis51     virtual bool runOnFunction(Function &F) {
52       InitializeAliasAnalysis(this);                 // set up super class
53       return false;
54     }
55 
56     /// getAdjustedAnalysisPointer - This method is used when a pass implements
57     /// an analysis interface through multiple inheritance.  If needed, it
58     /// should override this to adjust the this pointer as needed for the
59     /// specified pass info.
getAdjustedAnalysisPointerLibCallAliasAnalysis60     virtual void *getAdjustedAnalysisPointer(const void *PI) {
61       if (PI == &AliasAnalysis::ID)
62         return (AliasAnalysis*)this;
63       return this;
64     }
65 
66   private:
67     ModRefResult AnalyzeLibCallDetails(const LibCallFunctionInfo *FI,
68                                        ImmutableCallSite CS,
69                                        const Location &Loc);
70   };
71 }  // End of llvm namespace
72 
73 #endif
74