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
|
#include "clang/Analysis/FlowSensitive/SmartPointerAccessorCaching.h"
#include "clang/AST/CanonicalType.h"
#include "clang/AST/DeclCXX.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/ASTMatchers/ASTMatchersMacros.h"
#include "clang/Basic/OperatorKinds.h"
namespace clang::dataflow {
namespace {
using ast_matchers::callee;
using ast_matchers::cxxMemberCallExpr;
using ast_matchers::cxxMethodDecl;
using ast_matchers::cxxOperatorCallExpr;
using ast_matchers::hasName;
using ast_matchers::hasOverloadedOperatorName;
using ast_matchers::ofClass;
using ast_matchers::parameterCountIs;
using ast_matchers::pointerType;
using ast_matchers::referenceType;
using ast_matchers::returns;
bool hasSmartPointerClassShape(const CXXRecordDecl &RD, bool &HasGet,
bool &HasValue) {
// We may want to cache this search, but in current profiles it hasn't shown
// up as a hot spot (possibly because there aren't many hits, relatively).
bool HasArrow = false;
bool HasStar = false;
CanQualType StarReturnType, ArrowReturnType, GetReturnType, ValueReturnType;
for (const auto *MD : RD.methods()) {
// We only consider methods that are const and have zero parameters.
// It may be that there is a non-const overload for the method, but
// there should at least be a const overload as well.
if (!MD->isConst() || MD->getNumParams() != 0)
continue;
switch (MD->getOverloadedOperator()) {
case OO_Star:
if (MD->getReturnType()->isReferenceType()) {
HasStar = true;
StarReturnType = MD->getReturnType()
.getNonReferenceType()
->getCanonicalTypeUnqualified();
}
break;
case OO_Arrow:
if (MD->getReturnType()->isPointerType()) {
HasArrow = true;
ArrowReturnType = MD->getReturnType()
->getPointeeType()
->getCanonicalTypeUnqualified();
}
break;
case OO_None: {
IdentifierInfo *II = MD->getIdentifier();
if (II == nullptr)
continue;
if (II->isStr("get")) {
if (MD->getReturnType()->isPointerType()) {
HasGet = true;
GetReturnType = MD->getReturnType()
->getPointeeType()
->getCanonicalTypeUnqualified();
}
} else if (II->isStr("value")) {
if (MD->getReturnType()->isReferenceType()) {
HasValue = true;
ValueReturnType = MD->getReturnType()
.getNonReferenceType()
->getCanonicalTypeUnqualified();
}
}
} break;
default:
break;
}
}
if (!HasStar || !HasArrow || StarReturnType != ArrowReturnType)
return false;
HasGet = HasGet && (GetReturnType == StarReturnType);
HasValue = HasValue && (ValueReturnType == StarReturnType);
return true;
}
} // namespace
} // namespace clang::dataflow
// AST_MATCHER macros create an "internal" namespace, so we put it in
// its own anonymous namespace instead of in clang::dataflow.
namespace {
AST_MATCHER(clang::CXXRecordDecl, smartPointerClassWithGet) {
bool HasGet = false;
bool HasValue = false;
bool HasStarAndArrow =
clang::dataflow::hasSmartPointerClassShape(Node, HasGet, HasValue);
return HasStarAndArrow && HasGet;
}
AST_MATCHER(clang::CXXRecordDecl, smartPointerClassWithValue) {
bool HasGet = false;
bool HasValue = false;
bool HasStarAndArrow =
clang::dataflow::hasSmartPointerClassShape(Node, HasGet, HasValue);
return HasStarAndArrow && HasValue;
}
AST_MATCHER(clang::CXXRecordDecl, smartPointerClassWithGetOrValue) {
bool HasGet = false;
bool HasValue = false;
bool HasStarAndArrow =
clang::dataflow::hasSmartPointerClassShape(Node, HasGet, HasValue);
return HasStarAndArrow && (HasGet || HasValue);
}
} // namespace
namespace clang::dataflow {
ast_matchers::StatementMatcher isSmartPointerLikeOperatorStar() {
return cxxOperatorCallExpr(
hasOverloadedOperatorName("*"),
callee(cxxMethodDecl(parameterCountIs(0), returns(referenceType()),
ofClass(smartPointerClassWithGetOrValue()))));
}
ast_matchers::StatementMatcher isSmartPointerLikeOperatorArrow() {
return cxxOperatorCallExpr(
hasOverloadedOperatorName("->"),
callee(cxxMethodDecl(parameterCountIs(0), returns(pointerType()),
ofClass(smartPointerClassWithGetOrValue()))));
}
ast_matchers::StatementMatcher isSmartPointerLikeValueMethodCall() {
return cxxMemberCallExpr(callee(
cxxMethodDecl(parameterCountIs(0), returns(referenceType()),
hasName("value"), ofClass(smartPointerClassWithValue()))));
}
ast_matchers::StatementMatcher isSmartPointerLikeGetMethodCall() {
return cxxMemberCallExpr(callee(
cxxMethodDecl(parameterCountIs(0), returns(pointerType()), hasName("get"),
ofClass(smartPointerClassWithGet()))));
}
const FunctionDecl *
getCanonicalSmartPointerLikeOperatorCallee(const CallExpr *CE) {
const FunctionDecl *CanonicalCallee = nullptr;
const CXXMethodDecl *Callee =
cast_or_null<CXXMethodDecl>(CE->getDirectCallee());
if (Callee == nullptr)
return nullptr;
const CXXRecordDecl *RD = Callee->getParent();
if (RD == nullptr)
return nullptr;
for (const auto *MD : RD->methods()) {
if (MD->getOverloadedOperator() == OO_Star && MD->isConst() &&
MD->getNumParams() == 0 && MD->getReturnType()->isReferenceType()) {
CanonicalCallee = MD;
break;
}
}
return CanonicalCallee;
}
} // namespace clang::dataflow
|
