1 //== ConstraintManager.h - Constraints on symbolic values.-------*- C++ -*--==// 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 defined the interface to manage constraints on symbolic values. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_CLANG_GR_CONSTRAINT_MANAGER_H 15 #define LLVM_CLANG_GR_CONSTRAINT_MANAGER_H 16 17 #include "clang/StaticAnalyzer/Core/PathSensitive/SymbolManager.h" 18 #include "clang/StaticAnalyzer/Core/PathSensitive/SVals.h" 19 20 namespace llvm { 21 class APSInt; 22 } 23 24 namespace clang { 25 namespace ento { 26 27 class SubEngine; 28 29 class ConstraintManager { 30 public: 31 virtual ~ConstraintManager(); 32 virtual ProgramStateRef assume(ProgramStateRef state, 33 DefinedSVal Cond, 34 bool Assumption) = 0; 35 36 std::pair<ProgramStateRef, ProgramStateRef > 37 assumeDual(ProgramStateRef state, DefinedSVal Cond) 38 { 39 std::pair<ProgramStateRef, ProgramStateRef > res = 40 std::make_pair(assume(state, Cond, true), assume(state, Cond, false)); 41 42 assert(!(!res.first && !res.second) && "System is over constrained."); 43 return res; 44 } 45 46 virtual const llvm::APSInt* getSymVal(ProgramStateRef state, 47 SymbolRef sym) const = 0; 48 49 virtual bool isEqual(ProgramStateRef state, 50 SymbolRef sym, 51 const llvm::APSInt& V) const = 0; 52 53 virtual ProgramStateRef removeDeadBindings(ProgramStateRef state, 54 SymbolReaper& SymReaper) = 0; 55 56 virtual void print(ProgramStateRef state, 57 raw_ostream &Out, 58 const char* nl, 59 const char *sep) = 0; 60 61 virtual void EndPath(ProgramStateRef state) {} 62 63 protected: 64 /// canReasonAbout - Not all ConstraintManagers can accurately reason about 65 /// all SVal values. This method returns true if the ConstraintManager can 66 /// reasonably handle a given SVal value. This is typically queried by 67 /// ExprEngine to determine if the value should be replaced with a 68 /// conjured symbolic value in order to recover some precision. 69 virtual bool canReasonAbout(SVal X) const = 0; 70 }; 71 72 ConstraintManager* CreateBasicConstraintManager(ProgramStateManager& statemgr, 73 SubEngine &subengine); 74 ConstraintManager* CreateRangeConstraintManager(ProgramStateManager& statemgr, 75 SubEngine &subengine); 76 77 } // end GR namespace 78 79 } // end clang namespace 80 81 #endif 82
