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
|
//=======- NoUncountedMembersChecker.cpp -------------------------*- C++ -*-==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "ASTUtils.h"
#include "DiagOutputUtils.h"
#include "PtrTypesSemantics.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
#include "clang/StaticAnalyzer/Core/Checker.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/Support/Casting.h"
using namespace clang;
using namespace ento;
namespace {
class NoUncountedMemberChecker
: public Checker<check::ASTDecl<TranslationUnitDecl>> {
private:
BugType Bug;
mutable BugReporter *BR;
public:
NoUncountedMemberChecker()
: Bug(this,
"Member variable is a raw-poiner/reference to reference-countable "
"type",
"WebKit coding guidelines") {}
void checkASTDecl(const TranslationUnitDecl *TUD, AnalysisManager &MGR,
BugReporter &BRArg) const {
BR = &BRArg;
// The calls to checkAST* from AnalysisConsumer don't
// visit template instantiations or lambda classes. We
// want to visit those, so we make our own RecursiveASTVisitor.
struct LocalVisitor : public RecursiveASTVisitor<LocalVisitor> {
const NoUncountedMemberChecker *Checker;
explicit LocalVisitor(const NoUncountedMemberChecker *Checker)
: Checker(Checker) {
assert(Checker);
}
bool shouldVisitTemplateInstantiations() const { return true; }
bool shouldVisitImplicitCode() const { return false; }
bool VisitRecordDecl(const RecordDecl *RD) {
Checker->visitRecordDecl(RD);
return true;
}
};
LocalVisitor visitor(this);
visitor.TraverseDecl(const_cast<TranslationUnitDecl *>(TUD));
}
void visitRecordDecl(const RecordDecl *RD) const {
if (shouldSkipDecl(RD))
return;
for (auto Member : RD->fields()) {
const Type *MemberType = Member->getType().getTypePtrOrNull();
if (!MemberType)
continue;
if (auto *MemberCXXRD = MemberType->getPointeeCXXRecordDecl()) {
// If we don't see the definition we just don't know.
if (MemberCXXRD->hasDefinition()) {
llvm::Optional<bool> isRCAble = isRefCountable(MemberCXXRD);
if (isRCAble && *isRCAble)
reportBug(Member, MemberType, MemberCXXRD, RD);
}
}
}
}
bool shouldSkipDecl(const RecordDecl *RD) const {
if (!RD->isThisDeclarationADefinition())
return true;
if (RD->isImplicit())
return true;
if (RD->isLambda())
return true;
// If the construct doesn't have a source file, then it's not something
// we want to diagnose.
const auto RDLocation = RD->getLocation();
if (!RDLocation.isValid())
return true;
const auto Kind = RD->getTagKind();
// FIMXE: Should we check union members too?
if (Kind != TTK_Struct && Kind != TTK_Class)
return true;
// Ignore CXXRecords that come from system headers.
if (BR->getSourceManager().isInSystemHeader(RDLocation))
return true;
// Ref-counted smartpointers actually have raw-pointer to uncounted type as
// a member but we trust them to handle it correctly.
auto CXXRD = llvm::dyn_cast_or_null<CXXRecordDecl>(RD);
if (CXXRD)
return isRefCounted(CXXRD);
return false;
}
void reportBug(const FieldDecl *Member, const Type *MemberType,
const CXXRecordDecl *MemberCXXRD,
const RecordDecl *ClassCXXRD) const {
assert(Member);
assert(MemberType);
assert(MemberCXXRD);
SmallString<100> Buf;
llvm::raw_svector_ostream Os(Buf);
Os << "Member variable ";
printQuotedName(Os, Member);
Os << " in ";
printQuotedQualifiedName(Os, ClassCXXRD);
Os << " is a "
<< (isa<PointerType>(MemberType) ? "raw pointer" : "reference")
<< " to ref-countable type ";
printQuotedQualifiedName(Os, MemberCXXRD);
Os << "; member variables must be ref-counted.";
PathDiagnosticLocation BSLoc(Member->getSourceRange().getBegin(),
BR->getSourceManager());
auto Report = std::make_unique<BasicBugReport>(Bug, Os.str(), BSLoc);
Report->addRange(Member->getSourceRange());
BR->emitReport(std::move(Report));
}
};
} // namespace
void ento::registerNoUncountedMemberChecker(CheckerManager &Mgr) {
Mgr.registerChecker<NoUncountedMemberChecker>();
}
bool ento::shouldRegisterNoUncountedMemberChecker(
const CheckerManager &Mgr) {
return true;
}
|
