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
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
* 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/.
*/
#ifndef LO_CLANG_SHARED_PLUGINS
#include <cassert>
#include <stack>
#include "check.hxx"
#include "plugin.hxx"
// Find matches of
//
// ... << s.getStr()
//
// (for the rtl string classes) that can be written as just
//
// ... << s
namespace
{
class GetStr final : public loplugin::FilteringPlugin<GetStr>
{
public:
explicit GetStr(loplugin::InstantiationData const& data)
: FilteringPlugin(data)
{
}
bool PreTraverseFunctionDecl(FunctionDecl* decl)
{
functions_.push(decl);
return true;
}
bool PostTraverseFunctionDecl(FunctionDecl*, bool)
{
assert(!functions_.empty());
functions_.pop();
return true;
}
bool TraverseFunctionDecl(FunctionDecl* decl)
{
bool ret = true;
if (PreTraverseFunctionDecl(decl))
{
ret = FilteringPlugin::TraverseFunctionDecl(decl);
PostTraverseFunctionDecl(decl, ret);
}
return ret;
}
bool VisitCXXOperatorCallExpr(CXXOperatorCallExpr* expr)
{
if (ignoreLocation(expr))
{
return true;
}
if (expr->getOperator() != OO_LessLess)
{
return true;
}
assert(expr->getNumArgs() == 2);
if (!loplugin::TypeCheck(expr->getArg(0)->getType())
.ClassOrStruct("basic_ostream")
.StdNamespace()) //TODO: check template args
{
return true;
}
auto const arg1 = expr->getArg(1);
auto const e = dyn_cast<CXXMemberCallExpr>(arg1->IgnoreParenImpCasts());
if (e == nullptr)
{
return true;
}
bool castToVoid = false;
if (auto const ic = dyn_cast<ImplicitCastExpr>(arg1))
{
if (loplugin::TypeCheck(arg1->getType()).Pointer().Void())
{
castToVoid = true;
}
}
auto const t = e->getObjectType();
auto const tc = loplugin::TypeCheck(t);
if (!(tc.Class("OString").Namespace("rtl").GlobalNamespace()
|| tc.Class("OUString").Namespace("rtl").GlobalNamespace()
|| (castToVoid
&& (tc.Class("OStringBuffer").Namespace("rtl").GlobalNamespace()
|| tc.Class("OUStringBuffer").Namespace("rtl").GlobalNamespace()))))
{
return true;
}
if (!loplugin::DeclCheck(e->getMethodDecl()).Function("getStr"))
{
return true;
}
if (castToVoid)
{
report(DiagnosticsEngine::Warning,
("suspicious use of 'getStr' on an object of type %0; the result is implicitly"
" cast to a void pointer in a call of 'operator <<'"),
e->getExprLoc())
<< t.getLocalUnqualifiedType() << expr->getSourceRange();
return true;
}
if (!functions_.empty())
{
// Filter out occurrences of `s << t.getStr()` in the implementation of
// `operator <<(std::basic_ostream<...> & s, T const & t)`:
auto const fd = functions_.top();
if (fd->getOverloadedOperator() == OO_LessLess)
{
assert(fd->getNumParams() == 2);
if (loplugin::TypeCheck(fd->getParamDecl(0)->getType())
.LvalueReference()
.NonConstVolatile()
.TemplateSpecializationClass()
.ClassOrStruct("basic_ostream")
.StdNamespace()) //TODO: check template args
{
if (auto const t2
= fd->getParamDecl(1)->getType()->getAs<LValueReferenceType>())
{
auto const t3 = t2->getPointeeType();
if (t3.isConstQualified() && !t3.isVolatileQualified()
&& (t3.getCanonicalType().getTypePtr()
== t.getCanonicalType().getTypePtr()))
{
return true;
}
}
}
}
}
report(DiagnosticsEngine::Warning,
("directly use object of type %0 in a call of 'operator <<', instead of calling"
" 'getStr' first"),
e->getExprLoc())
<< t.getLocalUnqualifiedType() << expr->getSourceRange();
return true;
}
bool preRun() override { return compiler.getLangOpts().CPlusPlus; }
private:
std::stack<FunctionDecl*> functions_;
void run() override
{
if (preRun())
{
TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
}
}
};
loplugin::Plugin::Registration<GetStr> getstr("getstr");
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
|
