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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* Based on LLVM/Clang.
*
* This file is distributed under the University of Illinois Open Source
* License. See LICENSE.TXT for details.
*
*/
#include <cassert>
#include <string>
#include <iostream>
#include <fstream>
#include <set>
#include <unordered_set>
#include "config_clang.h"
#include "plugin.hxx"
#include "check.hxx"
/*
Look for places where we can pass by move && param and so avoid
unnecessary copies.
Empirically, when we are passing a container type to a function, 80% of the time,
we are passing a local temporary that can be moved instead of being copied.
TODO this could be a lot smarter, with ignoring false+ e.g. when copying a param
in a loop
*/
namespace
{
class MoveParam : public loplugin::FilteringPlugin<MoveParam>
{
public:
explicit MoveParam(loplugin::InstantiationData const& data)
: FilteringPlugin(data)
{
}
virtual bool preRun() override
{
std::string fn(handler.getMainFileName());
loplugin::normalizeDotDotInFilePath(fn);
if (loplugin::hasPathnamePrefix(fn, SRCDIR "/filter/source/msfilter/escherex.cxx"))
return false;
if (loplugin::hasPathnamePrefix(fn, SRCDIR "/sc/source/ui/docshell/docfunc.cxx"))
return false;
if (loplugin::hasPathnamePrefix(fn, SRCDIR "/sc/source/ui/view/viewfunc.cxx"))
return false;
if (loplugin::hasPathnamePrefix(fn, SRCDIR "/basegfx/source/polygon/b2dpolygontools.cxx"))
return false;
if (loplugin::hasPathnamePrefix(fn, SRCDIR "/basegfx/source/polygon/b3dpolygontools.cxx"))
return false;
if (loplugin::hasPathnamePrefix(fn, SRCDIR "/connectivity/source/commontools/dbtools.cxx"))
return false;
return true;
}
virtual void run() override
{
if (preRun())
TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
}
bool VisitCXXOperatorCallExpr(const CXXOperatorCallExpr*);
bool VisitCXXConstructExpr(const CXXConstructExpr*);
bool isContainerType(QualType qt);
};
bool MoveParam::VisitCXXOperatorCallExpr(const CXXOperatorCallExpr* callExpr)
{
if (ignoreLocation(callExpr))
return true;
if (!callExpr->isAssignmentOp())
return true;
auto qt = callExpr->getType();
if (!isContainerType(qt))
return true;
auto declRef = dyn_cast<DeclRefExpr>(callExpr->getArg(1)->IgnoreParenImpCasts());
if (!declRef)
return true;
auto parmVarDecl = dyn_cast_or_null<ParmVarDecl>(declRef->getDecl());
if (!parmVarDecl)
return true;
if (!loplugin::TypeCheck(parmVarDecl->getType()).LvalueReference().Const())
return true;
StringRef aFileName = getFilenameOfLocation(
compiler.getSourceManager().getSpellingLoc(parmVarDecl->getBeginLoc()));
if (loplugin::hasPathnamePrefix(aFileName,
SRCDIR "/svx/source/sidebar/line/LineWidthValueSet.cxx"))
return true;
report(DiagnosticsEngine::Warning, "rather use move && param1", callExpr->getBeginLoc());
return true;
}
bool MoveParam::VisitCXXConstructExpr(const CXXConstructExpr* constructExpr)
{
if (ignoreLocation(constructExpr->getBeginLoc()))
return true;
if (isInUnoIncludeFile(constructExpr->getBeginLoc()))
return true;
auto qt = constructExpr->getType();
if (!isContainerType(qt))
return true;
if (constructExpr->getNumArgs() != 1)
return true;
auto declRef = dyn_cast<DeclRefExpr>(constructExpr->getArg(0)->IgnoreParenImpCasts());
if (!declRef)
return true;
auto parmVarDecl = dyn_cast_or_null<ParmVarDecl>(declRef->getDecl());
if (!parmVarDecl)
return true;
if (!loplugin::TypeCheck(parmVarDecl->getType()).LvalueReference().Const())
return true;
StringRef aFileName = getFilenameOfLocation(
compiler.getSourceManager().getSpellingLoc(parmVarDecl->getBeginLoc()));
if (loplugin::hasPathnamePrefix(aFileName, SRCDIR
"/include/drawinglayer/primitive2d/Primitive2DContainer.hxx"))
return true;
if (loplugin::hasPathnamePrefix(aFileName,
SRCDIR "/include/drawinglayer/primitive3d/baseprimitive3d.hxx"))
return true;
if (loplugin::hasPathnamePrefix(aFileName, SRCDIR "/svx/source/svdraw/svdmrkv.cxx"))
return true;
if (loplugin::hasPathnamePrefix(aFileName, SRCDIR "/include/editeng/swafopt.hxx"))
return true;
if (loplugin::hasPathnamePrefix(
aFileName, SRCDIR "/drawinglayer/source/primitive2d/textdecoratedprimitive2d.cxx"))
return true;
if (loplugin::hasPathnamePrefix(aFileName,
SRCDIR "/chart2/source/tools/InternalDataProvider.cxx"))
return true;
if (loplugin::hasPathnamePrefix(aFileName, SRCDIR "/sc/source/core/data/attrib.cxx"))
return true;
if (loplugin::hasPathnamePrefix(aFileName, SRCDIR "/sw/source/core/doc/docfmt.cxx"))
return true;
if (loplugin::hasPathnamePrefix(aFileName, SRCDIR "/configmgr/source/modifications.cxx"))
return true;
if (loplugin::hasPathnamePrefix(aFileName, SRCDIR "/svx/source/dialog/srchdlg.cxx"))
return true;
if (loplugin::hasPathnamePrefix(aFileName,
SRCDIR "/stoc/source/servicemanager/servicemanager.cxx"))
return true;
report(DiagnosticsEngine::Warning, "rather use move && param3", constructExpr->getBeginLoc());
return true;
}
bool MoveParam::isContainerType(QualType qt)
{
auto tc = loplugin::TypeCheck(qt);
return tc.Class("Primitive2DContainer")
.Namespace("primitive2d")
.Namespace("drawinglayer")
.GlobalNamespace()
|| tc.ClassOrStruct("sorted_vector").Namespace("o3tl").GlobalNamespace()
|| tc.ClassOrStruct("array").StdNamespace() || tc.ClassOrStruct("vector").StdNamespace()
|| tc.ClassOrStruct("deque").StdNamespace()
|| tc.ClassOrStruct("forward_list").StdNamespace()
|| tc.ClassOrStruct("list").StdNamespace() || tc.ClassOrStruct("set").StdNamespace()
|| tc.ClassOrStruct("map").StdNamespace() || tc.ClassOrStruct("multiset").StdNamespace()
|| tc.ClassOrStruct("multimap").StdNamespace()
|| tc.ClassOrStruct("unordered_set").StdNamespace()
|| tc.ClassOrStruct("unordered_map").StdNamespace()
|| tc.ClassOrStruct("unordered_multiset").StdNamespace()
|| tc.ClassOrStruct("unordered_multimap").StdNamespace()
|| tc.ClassOrStruct("stack").StdNamespace() || tc.ClassOrStruct("queue").StdNamespace()
|| tc.ClassOrStruct("priority_queue").StdNamespace();
}
/** off by default because it needs some hand-holding */
loplugin::Plugin::Registration<MoveParam> moveparam("moveparam", false);
} // namespace
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
