1 //===-- JumpInstrTableInfo.h: Info for Jump-Instruction Tables --*- C++ -*-===// 2 // 3 // This file is distributed under the University of Illinois Open Source 4 // License. See LICENSE.TXT for details. 5 // 6 //===----------------------------------------------------------------------===// 7 /// 8 /// \file 9 /// \brief Information about jump-instruction tables that have been created by 10 /// JumpInstrTables pass. 11 /// 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_ANALYSIS_JUMPINSTRTABLEINFO_H 15 #define LLVM_ANALYSIS_JUMPINSTRTABLEINFO_H 16 17 #include "llvm/ADT/DenseMap.h" 18 #include "llvm/Pass.h" 19 20 #include <vector> 21 22 namespace llvm { 23 class Function; 24 class FunctionType; 25 26 /// This class stores information about jump-instruction tables created by the 27 /// JumpInstrTables pass (in lib/CodeGen/JumpInstrTables.cpp). Each table is a 28 /// map from a function type to a vector of pairs. The first element of each 29 /// pair is the function that has the jumptable annotation. The second element 30 /// is a function that was declared by JumpInstrTables and used to replace all 31 /// address-taking sites for the original function. 32 /// 33 /// The information in this pass is used in AsmPrinter 34 /// (lib/CodeGen/AsmPrinter/AsmPrinter.cpp) to generate the required assembly 35 /// for the jump-instruction tables. 36 class JumpInstrTableInfo : public ImmutablePass { 37 public: 38 static char ID; 39 40 JumpInstrTableInfo(); 41 virtual ~JumpInstrTableInfo(); 42 const char *getPassName() const override { 43 return "Jump-Instruction Table Info"; 44 } 45 46 typedef std::pair<Function *, Function *> JumpPair; 47 typedef DenseMap<FunctionType *, std::vector<JumpPair> > JumpTables; 48 49 /// Inserts an entry in a table, adding the table if it doesn't exist. 50 void insertEntry(FunctionType *TableFunTy, Function *Target, Function *Jump); 51 52 /// Gets the tables. 53 const JumpTables &getTables() const { return Tables; } 54 55 private: 56 JumpTables Tables; 57 }; 58 } 59 60 #endif /* LLVM_ANALYSIS_JUMPINSTRTABLEINFO_H */ 61
