LibCallAliasAnalysis.h 2.5 KB

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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. #ifndef LLVM_ANALYSIS_LIBCALLALIASANALYSIS_H
  14. #define LLVM_ANALYSIS_LIBCALLALIASANALYSIS_H
  15. #include "llvm/Analysis/AliasAnalysis.h"
  16. #include "llvm/IR/Module.h"
  17. #include "llvm/Pass.h"
  18. namespace llvm {
  19. class LibCallInfo;
  20. struct LibCallFunctionInfo;
  21. /// LibCallAliasAnalysis - Alias analysis driven from LibCallInfo.
  22. struct LibCallAliasAnalysis : public FunctionPass, public AliasAnalysis {
  23. static char ID; // Class identification
  24. LibCallInfo *LCI;
  25. explicit LibCallAliasAnalysis(LibCallInfo *LC = nullptr)
  26. : FunctionPass(ID), LCI(LC) {
  27. initializeLibCallAliasAnalysisPass(*PassRegistry::getPassRegistry());
  28. }
  29. explicit LibCallAliasAnalysis(char &ID, LibCallInfo *LC)
  30. : FunctionPass(ID), LCI(LC) {
  31. initializeLibCallAliasAnalysisPass(*PassRegistry::getPassRegistry());
  32. }
  33. ~LibCallAliasAnalysis() override;
  34. ModRefResult getModRefInfo(ImmutableCallSite CS,
  35. const MemoryLocation &Loc) override;
  36. ModRefResult getModRefInfo(ImmutableCallSite CS1,
  37. ImmutableCallSite CS2) override {
  38. // TODO: Could compare two direct calls against each other if we cared to.
  39. return AliasAnalysis::getModRefInfo(CS1, CS2);
  40. }
  41. void getAnalysisUsage(AnalysisUsage &AU) const override;
  42. bool runOnFunction(Function &F) override;
  43. /// getAdjustedAnalysisPointer - This method is used when a pass implements
  44. /// an analysis interface through multiple inheritance. If needed, it
  45. /// should override this to adjust the this pointer as needed for the
  46. /// specified pass info.
  47. void *getAdjustedAnalysisPointer(const void *PI) override {
  48. if (PI == &AliasAnalysis::ID)
  49. return (AliasAnalysis*)this;
  50. return this;
  51. }
  52. private:
  53. ModRefResult AnalyzeLibCallDetails(const LibCallFunctionInfo *FI,
  54. ImmutableCallSite CS,
  55. const MemoryLocation &Loc);
  56. };
  57. } // End of llvm namespace
  58. #endif