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) 31 : FunctionPass(ID), LCI(LC) { 32 initializeLibCallAliasAnalysisPass(*PassRegistry::getPassRegistry()); 33 } 34 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 43 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 51 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. 60 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
