blob: 4dff6ae852d9310d1f701bd8a01dfbd82a7238d2 (
plain)
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
|
/* -*- 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 "compat.hxx"
#include "plugin.hxx"
/**
look for unnecessary blocks that just catch and rethrow:
try {
stuff
} catch (exception const &) {
throw;
}
*/
namespace {
class UnnecessaryCatchThrow:
public RecursiveASTVisitor<UnnecessaryCatchThrow>, public loplugin::Plugin
{
public:
explicit UnnecessaryCatchThrow(loplugin::InstantiationData const & data): Plugin(data) {}
virtual void run() override
{
TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
}
bool VisitCXXTryStmt(CXXTryStmt const *);
};
bool UnnecessaryCatchThrow::VisitCXXTryStmt(CXXTryStmt const * tryStmt)
{
if (ignoreLocation(tryStmt))
return true;
if (tryStmt->getNumHandlers() != 1)
return true;
auto catchStmt = tryStmt->getHandler(0);
auto compoundStmt = dyn_cast<CompoundStmt>(catchStmt->getHandlerBlock());
if (!compoundStmt || compoundStmt->size() != 1)
return true;
auto throwExpr = dyn_cast<CXXThrowExpr>(compoundStmt->body_front());
if (!throwExpr)
return true;
auto subExpr = throwExpr->getSubExpr();
if (subExpr)
{
if (auto cxxConstructExpr = dyn_cast<CXXConstructExpr>(subExpr)) {
if (!cxxConstructExpr->getConstructor()->isCopyConstructor())
return true;
if (!cxxConstructExpr->getConstructor()->getParent()->hasAttr<FinalAttr>())
return true;
if (cxxConstructExpr->getNumArgs() != 1)
return true;
subExpr = cxxConstructExpr->getArg(0);
}
auto declRefExpr = dyn_cast<DeclRefExpr>(subExpr->IgnoreImpCasts());
if (!declRefExpr)
return true;
if (declRefExpr->getDecl() != catchStmt->getExceptionDecl())
return true;
}
report( DiagnosticsEngine::Warning, "unnecessary catch and throw",
compat::getBeginLoc(catchStmt))
<< catchStmt->getSourceRange();
return true;
}
loplugin::Plugin::Registration< UnnecessaryCatchThrow > X("unnecessarycatchthrow");
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|