LibCallAliasAnalysis.h revision 503e204470d7d49eacf973cef28ec26ff6641914
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 20namespace 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 } 33 explicit LibCallAliasAnalysis(const void *ID, LibCallInfo *LC) 34 : FunctionPass(ID), LCI(LC) { 35 } 36 ~LibCallAliasAnalysis(); 37 38 ModRefResult getModRefInfo(ImmutableCallSite CS, 39 const Value *P, unsigned Size); 40 41 ModRefResult getModRefInfo(ImmutableCallSite CS1, 42 ImmutableCallSite CS2) { 43 // TODO: Could compare two direct calls against each other if we cared to. 44 return AliasAnalysis::getModRefInfo(CS1, CS2); 45 } 46 47 virtual void getAnalysisUsage(AnalysisUsage &AU) const; 48 49 virtual bool runOnFunction(Function &F) { 50 InitializeAliasAnalysis(this); // set up super class 51 return false; 52 } 53 54 /// getAdjustedAnalysisPointer - This method is used when a pass implements 55 /// an analysis interface through multiple inheritance. If needed, it 56 /// should override this to adjust the this pointer as needed for the 57 /// specified pass info. 58 virtual void *getAdjustedAnalysisPointer(const PassInfo *PI) { 59 if (PI->isPassID(&AliasAnalysis::ID)) 60 return (AliasAnalysis*)this; 61 return this; 62 } 63 64 private: 65 ModRefResult AnalyzeLibCallDetails(const LibCallFunctionInfo *FI, 66 ImmutableCallSite CS, 67 const Value *P, unsigned Size); 68 }; 69} // End of llvm namespace 70 71#endif 72