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
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include <cassert>
#include <string>
#include <iostream>
#include <fstream>
#include <set>
#include <clang/AST/CXXInheritance.h>
#include "plugin.hxx"
#include "check.hxx"
/**
Look for calls where the param is bool but the call-site-arg is pointer.
*/
namespace
{
class PointerBool : public RecursiveASTVisitor<PointerBool>, public loplugin::Plugin
{
public:
explicit PointerBool(loplugin::InstantiationData const& data)
: Plugin(data)
{
}
virtual void run() override { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
bool VisitCallExpr(CallExpr const*);
private:
llvm::Optional<APSInt> getCallValue(const Expr* arg);
};
bool PointerBool::VisitCallExpr(CallExpr const* callExpr)
{
if (ignoreLocation(callExpr))
return true;
// TODO this doesn't currently work, the args and the params don't seem to line up
if (isa<CXXOperatorCallExpr>(callExpr))
return true;
const FunctionDecl* functionDecl;
if (isa<CXXMemberCallExpr>(callExpr))
{
functionDecl = dyn_cast<CXXMemberCallExpr>(callExpr)->getMethodDecl();
}
else
{
functionDecl = callExpr->getDirectCallee();
}
if (!functionDecl)
return true;
unsigned len = std::min(callExpr->getNumArgs(), functionDecl->getNumParams());
for (unsigned i = 0; i < len; ++i)
{
auto param = functionDecl->getParamDecl(i);
auto paramTC = loplugin::TypeCheck(param->getType());
if (!paramTC.AnyBoolean())
continue;
auto arg = callExpr->getArg(i)->IgnoreImpCasts();
auto argTC = loplugin::TypeCheck(arg->getType());
if (argTC.AnyBoolean())
continue;
// sal_Bool is sometimes disguised
if (isa<SubstTemplateTypeParmType>(arg->getType()))
if (arg->getType()->getUnqualifiedDesugaredType()->isSpecificBuiltinType(
clang::BuiltinType::UChar))
continue;
if (arg->getType()->isDependentType())
continue;
if (arg->getType()->isIntegerType())
{
auto ret = getCallValue(arg);
if (ret.hasValue() && (ret.getValue() == 1 || ret.getValue() == 0))
continue;
// something like: priv->m_nLOKFeatures & LOK_FEATURE_DOCUMENT_PASSWORD
if (isa<BinaryOperator>(arg->IgnoreParenImpCasts()))
continue;
// something like: pbEmbolden ? FcTrue : FcFalse
if (isa<ConditionalOperator>(arg->IgnoreParenImpCasts()))
continue;
}
report(DiagnosticsEngine::Warning,
"possibly unwanted implicit conversion when calling bool param", arg->getExprLoc())
<< arg->getSourceRange();
report(DiagnosticsEngine::Note, "method here", param->getLocation())
<< param->getSourceRange();
}
return true;
}
llvm::Optional<APSInt> PointerBool::getCallValue(const Expr* arg)
{
arg = arg->IgnoreParenCasts();
if (auto defArg = dyn_cast<CXXDefaultArgExpr>(arg))
{
arg = defArg->getExpr()->IgnoreParenCasts();
}
// ignore this, it seems to trigger an infinite recursion
if (isa<UnaryExprOrTypeTraitExpr>(arg))
{
return llvm::Optional<APSInt>();
}
APSInt x1;
if (arg->EvaluateAsInt(x1, compiler.getASTContext()))
{
return x1;
}
return llvm::Optional<APSInt>();
}
loplugin::Plugin::Registration<PointerBool> X("pointerbool", true);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|