1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
//== Store.h - Interface for maps from Locations to Values ------*- C++ -*--==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defined the types Store and StoreManager.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_ANALYSIS_STORE_H
#define LLVM_CLANG_ANALYSIS_STORE_H
#include "clang/Analysis/PathSensitive/MemRegion.h"
#include "clang/Analysis/PathSensitive/SVals.h"
#include "clang/Analysis/PathSensitive/ValueManager.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
namespace clang {
typedef const void* Store;
class GRState;
class GRStateManager;
class Stmt;
class Expr;
class ObjCIvarDecl;
class SubRegionMap;
class StackFrameContext;
class StoreManager {
protected:
ValueManager &ValMgr;
GRStateManager &StateMgr;
/// MRMgr - Manages region objects associated with this StoreManager.
MemRegionManager &MRMgr;
StoreManager(GRStateManager &stateMgr);
public:
virtual ~StoreManager() {}
/// Return the value bound to specified location in a given state.
/// \param[in] state The analysis state.
/// \param[in] loc The symbolic memory location.
/// \param[in] T An optional type that provides a hint indicating the
/// expected type of the returned value. This is used if the value is
/// lazily computed.
/// \return The value bound to the location \c loc.
virtual SValuator::CastResult Retrieve(const GRState *state, Loc loc,
QualType T = QualType()) = 0;
/// Return a state with the specified value bound to the given location.
/// \param[in] state The analysis state.
/// \param[in] loc The symbolic memory location.
/// \param[in] val The value to bind to location \c loc.
/// \return A pointer to a GRState object that contains the same bindings as
/// \c state with the addition of having the value specified by \c val bound
/// to the location given for \c loc.
virtual const GRState *Bind(const GRState *state, Loc loc, SVal val) = 0;
virtual Store Remove(Store St, Loc L) = 0;
/// BindCompoundLiteral - Return the store that has the bindings currently
/// in 'store' plus the bindings for the CompoundLiteral. 'R' is the region
/// for the compound literal and 'BegInit' and 'EndInit' represent an
/// array of initializer values.
virtual const GRState *BindCompoundLiteral(const GRState *state,
const CompoundLiteralExpr* cl,
const LocationContext *LC,
SVal v) = 0;
/// getInitialStore - Returns the initial "empty" store representing the
/// value bindings upon entry to an analyzed function.
virtual Store getInitialStore(const LocationContext *InitLoc) = 0;
/// getRegionManager - Returns the internal RegionManager object that is
/// used to query and manipulate MemRegion objects.
MemRegionManager& getRegionManager() { return MRMgr; }
/// getSubRegionMap - Returns an opaque map object that clients can query
/// to get the subregions of a given MemRegion object. It is the
// caller's responsibility to 'delete' the returned map.
virtual SubRegionMap *getSubRegionMap(const GRState *state) = 0;
virtual SVal getLValueVar(const VarDecl *VD, const LocationContext *LC) = 0;
virtual SVal getLValueString(const StringLiteral* sl) = 0;
SVal getLValueCompoundLiteral(const CompoundLiteralExpr* cl,
const LocationContext *LC);
virtual SVal getLValueIvar(const ObjCIvarDecl* decl, SVal base) = 0;
virtual SVal getLValueField(const FieldDecl* D, SVal Base) = 0;
virtual SVal getLValueElement(QualType elementType, SVal offset, SVal Base)=0;
// FIXME: Make out-of-line.
virtual DefinedOrUnknownSVal getSizeInElements(const GRState *state,
const MemRegion *region) {
return UnknownVal();
}
/// ArrayToPointer - Used by GRExprEngine::VistCast to handle implicit
/// conversions between arrays and pointers.
virtual SVal ArrayToPointer(Loc Array) = 0;
class CastResult {
const GRState *state;
const MemRegion *region;
public:
const GRState *getState() const { return state; }
const MemRegion* getRegion() const { return region; }
CastResult(const GRState *s, const MemRegion* r = 0) : state(s), region(r){}
};
/// CastRegion - Used by GRExprEngine::VisitCast to handle casts from
/// a MemRegion* to a specific location type. 'R' is the region being
/// casted and 'CastToTy' the result type of the cast.
const MemRegion *CastRegion(const MemRegion *region, QualType CastToTy);
/// EvalBinOp - Perform pointer arithmetic.
virtual SVal EvalBinOp(const GRState *state, BinaryOperator::Opcode Op,
Loc lhs, NonLoc rhs, QualType resultTy) {
return UnknownVal();
}
virtual void RemoveDeadBindings(GRState &state, Stmt* Loc,
SymbolReaper& SymReaper,
llvm::SmallVectorImpl<const MemRegion*>& RegionRoots) = 0;
virtual const GRState *BindDecl(const GRState *ST, const VarRegion *VR,
SVal initVal) = 0;
virtual const GRState *BindDeclWithNoInit(const GRState *ST,
const VarRegion *VR) = 0;
typedef llvm::DenseSet<SymbolRef> InvalidatedSymbols;
virtual const GRState *InvalidateRegion(const GRState *state,
const MemRegion *R,
const Expr *E, unsigned Count,
InvalidatedSymbols *IS) = 0;
virtual const GRState *InvalidateRegions(const GRState *state,
const MemRegion * const *Begin,
const MemRegion * const *End,
const Expr *E, unsigned Count,
InvalidatedSymbols *IS);
// FIXME: Make out-of-line.
virtual const GRState *setExtent(const GRState *state,
const MemRegion *region, SVal extent) {
return state;
}
/// EnterStackFrame - Let the StoreManager to do something when execution
/// engine is about to execute into a callee.
virtual const GRState *EnterStackFrame(const GRState *state,
const StackFrameContext *frame) {
return state;
}
virtual void print(Store store, llvm::raw_ostream& Out,
const char* nl, const char *sep) = 0;
class BindingsHandler {
public:
virtual ~BindingsHandler();
virtual bool HandleBinding(StoreManager& SMgr, Store store,
const MemRegion *region, SVal val) = 0;
};
/// iterBindings - Iterate over the bindings in the Store.
virtual void iterBindings(Store store, BindingsHandler& f) = 0;
protected:
const MemRegion *MakeElementRegion(const MemRegion *Base,
QualType pointeeTy, uint64_t index = 0);
/// CastRetrievedVal - Used by subclasses of StoreManager to implement
/// implicit casts that arise from loads from regions that are reinterpreted
/// as another region.
SVal CastRetrievedVal(SVal val, const TypedRegion *R, QualType castTy);
};
// FIXME: Do we still need this?
/// SubRegionMap - An abstract interface that represents a queryable map
/// between MemRegion objects and their subregions.
class SubRegionMap {
public:
virtual ~SubRegionMap() {}
class Visitor {
public:
virtual ~Visitor() {};
virtual bool Visit(const MemRegion* Parent, const MemRegion* SubRegion) = 0;
};
virtual bool iterSubRegions(const MemRegion *region, Visitor& V) const = 0;
};
// FIXME: Do we need to pass GRStateManager anymore?
StoreManager *CreateBasicStoreManager(GRStateManager& StMgr);
StoreManager *CreateRegionStoreManager(GRStateManager& StMgr);
StoreManager *CreateFieldsOnlyRegionStoreManager(GRStateManager& StMgr);
} // end clang namespace
#endif
|
