1 //===- LibCallAliasAnalysis.h - Implement AliasAnalysis for libcalls ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the LibCallAliasAnalysis class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_ANALYSIS_LIBCALL_AA_H
15 #define LLVM_ANALYSIS_LIBCALL_AA_H
17 #include "llvm/Analysis/AliasAnalysis.h"
18 #include "llvm/Pass.h"
22 struct LibCallFunctionInfo;
24 /// LibCallAliasAnalysis - Alias analysis driven from LibCallInfo.
25 struct LibCallAliasAnalysis : public FunctionPass, public AliasAnalysis {
26 static char ID; // Class identification
30 explicit LibCallAliasAnalysis(LibCallInfo *LC = 0)
31 : FunctionPass(&ID), LCI(LC) {
33 explicit LibCallAliasAnalysis(const void *ID, LibCallInfo *LC)
34 : FunctionPass(ID), LCI(LC) {
36 ~LibCallAliasAnalysis();
38 ModRefResult getModRefInfo(ImmutableCallSite CS,
39 const Value *P, unsigned Size);
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);
47 virtual void getAnalysisUsage(AnalysisUsage &AU) const;
49 virtual bool runOnFunction(Function &F) {
50 InitializeAliasAnalysis(this); // set up super class
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;
65 ModRefResult AnalyzeLibCallDetails(const LibCallFunctionInfo *FI,
67 const Value *P, unsigned Size);
69 } // End of llvm namespace