Environment.h revision 686775deca8b8685eb90801495880e3abdd844c2 
1//== Environment.h - Map from Stmt* to Locations/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 Environment and EnvironmentManager classes.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CLANG_GR_ENVIRONMENT_H
15#define LLVM_CLANG_GR_ENVIRONMENT_H
16
17#include "clang/StaticAnalyzer/Core/PathSensitive/Store.h"
18#include "clang/StaticAnalyzer/Core/PathSensitive/SVals.h"
19#include "llvm/ADT/ImmutableMap.h"
20
21namespace clang {
22
23class LiveVariables;
24
25namespace ento {
26
27class EnvironmentManager;
28class SValBuilder;
29
30/// Environment - An immutable map from Stmts to their current
31///  symbolic values (SVals).
32///
33class Environment {
34private:
35  friend class EnvironmentManager;
36
37  // Type definitions.
38  typedef llvm::ImmutableMap<const Stmt*,SVal> BindingsTy;
39
40  // Data.
41  BindingsTy ExprBindings;
42
43  Environment(BindingsTy eb)
44    : ExprBindings(eb) {}
45
46  SVal lookupExpr(const Stmt* E) const;
47
48public:
49  typedef BindingsTy::iterator iterator;
50  iterator begin() const { return ExprBindings.begin(); }
51  iterator end() const { return ExprBindings.end(); }
52
53
54  /// getSVal - Fetches the current binding of the expression in the
55  ///  Environment.
56  SVal getSVal(const Stmt* Ex, SValBuilder& svalBuilder,
57	       bool useOnlyDirectBindings = false) const;
58
59  /// Profile - Profile the contents of an Environment object for use
60  ///  in a FoldingSet.
61  static void Profile(llvm::FoldingSetNodeID& ID, const Environment* env) {
62    env->ExprBindings.Profile(ID);
63  }
64
65  /// Profile - Used to profile the contents of this object for inclusion
66  ///  in a FoldingSet.
67  void Profile(llvm::FoldingSetNodeID& ID) const {
68    Profile(ID, this);
69  }
70
71  bool operator==(const Environment& RHS) const {
72    return ExprBindings == RHS.ExprBindings;
73  }
74};
75
76class EnvironmentManager {
77private:
78  typedef Environment::BindingsTy::Factory FactoryTy;
79  FactoryTy F;
80
81public:
82  EnvironmentManager(llvm::BumpPtrAllocator& Allocator) : F(Allocator) {}
83  ~EnvironmentManager() {}
84
85  Environment getInitialEnvironment() {
86    return Environment(F.getEmptyMap());
87  }
88
89  /// Bind the value 'V' to the statement 'S'.
90  Environment bindExpr(Environment Env, const Stmt *S, SVal V,
91                       bool Invalidate);
92
93  /// Bind the location 'location' and value 'V' to the statement 'S'.  This
94  /// is used when simulating loads/stores.
95  Environment bindExprAndLocation(Environment Env, const Stmt *S, SVal location,
96                                  SVal V);
97
98  Environment removeDeadBindings(Environment Env,
99                                 SymbolReaper &SymReaper, const GRState *ST,
100                          SmallVectorImpl<const MemRegion*>& RegionRoots);
101};
102
103} // end GR namespace
104
105} // end clang namespace
106
107#endif
108