src/llvm/include/llvm/Analysis/LibCallAliasAnalysis.h

   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_LIBCALLALIASANALYSIS_H
  15 #define LLVM_ANALYSIS_LIBCALLALIASANALYSIS_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 = nullptr)
  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) override;
  42
  43     ModRefResult getModRefInfo(ImmutableCallSite CS1,
  44                                ImmutableCallSite CS2) override {
  45       // TODO: Could compare two direct calls against each other if we cared to.
  46       return AliasAnalysis::getModRefInfo(CS1, CS2);
  47     }
  48
  49     void getAnalysisUsage(AnalysisUsage &AU) const override;
  50
  51     bool runOnFunction(Function &F) override {
  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     void *getAdjustedAnalysisPointer(const void *PI) override {
  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