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  1. //===- FaultMaps.h - The "FaultMaps" section --------------------*- C++ -*-===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //===----------------------------------------------------------------------===//
  8.  
  9. #ifndef LLVM_CODEGEN_FAULTMAPS_H
  10. #define LLVM_CODEGEN_FAULTMAPS_H
  11.  
  12. #include "llvm/MC/MCSymbol.h"
  13. #include <map>
  14. #include <vector>
  15.  
  16. namespace llvm {
  17.  
  18. class AsmPrinter;
  19. class MCExpr;
  20.  
  21. class FaultMaps {
  22. public:
  23.   enum FaultKind {
  24.     FaultingLoad = 1,
  25.     FaultingLoadStore,
  26.     FaultingStore,
  27.     FaultKindMax
  28.   };
  29.  
  30.   explicit FaultMaps(AsmPrinter &AP);
  31.  
  32.   static const char *faultTypeToString(FaultKind);
  33.  
  34.   void recordFaultingOp(FaultKind FaultTy, const MCSymbol *FaultingLabel,
  35.                         const MCSymbol *HandlerLabel);
  36.   void serializeToFaultMapSection();
  37.   void reset() {
  38.     FunctionInfos.clear();
  39.   }
  40.  
  41. private:
  42.   static const char *WFMP;
  43.  
  44.   struct FaultInfo {
  45.     FaultKind Kind = FaultKindMax;
  46.     const MCExpr *FaultingOffsetExpr = nullptr;
  47.     const MCExpr *HandlerOffsetExpr = nullptr;
  48.  
  49.     FaultInfo() = default;
  50.  
  51.     explicit FaultInfo(FaultMaps::FaultKind Kind, const MCExpr *FaultingOffset,
  52.                        const MCExpr *HandlerOffset)
  53.         : Kind(Kind), FaultingOffsetExpr(FaultingOffset),
  54.           HandlerOffsetExpr(HandlerOffset) {}
  55.   };
  56.  
  57.   using FunctionFaultInfos = std::vector<FaultInfo>;
  58.  
  59.   // We'd like to keep a stable iteration order for FunctionInfos to help
  60.   // FileCheck based testing.
  61.   struct MCSymbolComparator {
  62.     bool operator()(const MCSymbol *LHS, const MCSymbol *RHS) const {
  63.       return LHS->getName() < RHS->getName();
  64.     }
  65.   };
  66.  
  67.   std::map<const MCSymbol *, FunctionFaultInfos, MCSymbolComparator>
  68.       FunctionInfos;
  69.   AsmPrinter &AP;
  70.  
  71.   void emitFunctionInfo(const MCSymbol *FnLabel, const FunctionFaultInfos &FFI);
  72. };
  73.  
  74. } // end namespace llvm
  75.  
  76. #endif // LLVM_CODEGEN_FAULTMAPS_H
  77.