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
|
//===-- GRExprEngineBuilders.h - "Builder" classes for GRExprEngine -*- C++ -*-=
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines smart builder "references" which are used to marshal
// builders between GRExprEngine objects and their related components.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_ANALYSIS_GREXPRENGINE_BUILDERS
#define LLVM_CLANG_ANALYSIS_GREXPRENGINE_BUILDERS
#include "clang/Analysis/PathSensitive/GRExprEngine.h"
namespace clang {
// SaveAndRestore - A utility class that uses RAII to save and restore
// the value of a variable.
template<typename T>
struct SaveAndRestore {
SaveAndRestore(T& x) : X(x), old_value(x) {}
~SaveAndRestore() { X = old_value; }
T get() { return old_value; }
private:
T& X;
T old_value;
};
// SaveOr - Similar to SaveAndRestore. Operates only on bools; the old
// value of a variable is saved, and during the dstor the old value is
// or'ed with the new value.
struct SaveOr {
SaveOr(bool& x) : X(x), old_value(x) { x = false; }
~SaveOr() { X |= old_value; }
private:
bool& X;
const bool old_value;
};
class GRStmtNodeBuilderRef {
GRExprEngine::NodeSet &Dst;
GRExprEngine::StmtNodeBuilder &B;
GRExprEngine& Eng;
GRExprEngine::NodeTy* Pred;
const GRState* state;
const Stmt* stmt;
const unsigned OldSize;
const bool AutoCreateNode;
SaveAndRestore<bool> OldSink;
SaveAndRestore<const void*> OldTag;
SaveOr OldHasGen;
private:
friend class GRExprEngine;
GRStmtNodeBuilderRef(); // do not implement
void operator=(const GRStmtNodeBuilderRef&); // do not implement
GRStmtNodeBuilderRef(GRExprEngine::NodeSet &dst,
GRExprEngine::StmtNodeBuilder &builder,
GRExprEngine& eng,
GRExprEngine::NodeTy* pred,
const GRState *st,
const Stmt* s, bool auto_create_node)
: Dst(dst), B(builder), Eng(eng), Pred(pred),
state(st), stmt(s), OldSize(Dst.size()), AutoCreateNode(auto_create_node),
OldSink(B.BuildSinks), OldTag(B.Tag), OldHasGen(B.HasGeneratedNode) {}
public:
~GRStmtNodeBuilderRef() {
// Handle the case where no nodes where generated. Auto-generate that
// contains the updated state if we aren't generating sinks.
if (!B.BuildSinks && Dst.size() == OldSize && !B.HasGeneratedNode) {
if (AutoCreateNode)
B.MakeNode(Dst, const_cast<Stmt*>(stmt), Pred, state);
else
Dst.Add(Pred);
}
}
GRStateRef getState() {
return GRStateRef(state, Eng.getStateManager());
}
GRStateManager& getStateManager() {
return Eng.getStateManager();
}
GRExprEngine::NodeTy* MakeNode(const GRState* state) {
return B.MakeNode(Dst, const_cast<Stmt*>(stmt), Pred, state);
}
};
} // end clang namespace
#endif
|
