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
|
//===--- ConvertMemberFunctionsToStatic.cpp - clang-tidy ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "ConvertMemberFunctionsToStatic.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Lex/Lexer.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace readability {
AST_MATCHER(CXXMethodDecl, isStatic) { return Node.isStatic(); }
AST_MATCHER(CXXMethodDecl, hasTrivialBody) { return Node.hasTrivialBody(); }
AST_MATCHER(CXXMethodDecl, isOverloadedOperator) {
return Node.isOverloadedOperator();
}
AST_MATCHER(CXXRecordDecl, hasAnyDependentBases) {
return Node.hasAnyDependentBases();
}
AST_MATCHER(CXXMethodDecl, isTemplate) {
return Node.getTemplatedKind() != FunctionDecl::TK_NonTemplate;
}
AST_MATCHER(CXXMethodDecl, isDependentContext) {
return Node.isDependentContext();
}
AST_MATCHER(CXXMethodDecl, isInsideMacroDefinition) {
const ASTContext &Ctxt = Finder->getASTContext();
return clang::Lexer::makeFileCharRange(
clang::CharSourceRange::getCharRange(
Node.getTypeSourceInfo()->getTypeLoc().getSourceRange()),
Ctxt.getSourceManager(), Ctxt.getLangOpts())
.isInvalid();
}
AST_MATCHER_P(CXXMethodDecl, hasCanonicalDecl,
ast_matchers::internal::Matcher<CXXMethodDecl>, InnerMatcher) {
return InnerMatcher.matches(*Node.getCanonicalDecl(), Finder, Builder);
}
AST_MATCHER(CXXMethodDecl, usesThis) {
class FindUsageOfThis : public RecursiveASTVisitor<FindUsageOfThis> {
public:
bool Used = false;
bool VisitCXXThisExpr(const CXXThisExpr *E) {
Used = true;
return false; // Stop traversal.
}
} UsageOfThis;
// TraverseStmt does not modify its argument.
UsageOfThis.TraverseStmt(const_cast<Stmt *>(Node.getBody()));
return UsageOfThis.Used;
}
void ConvertMemberFunctionsToStatic::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
cxxMethodDecl(
isDefinition(), isUserProvided(),
unless(anyOf(
isExpansionInSystemHeader(), isVirtual(), isStatic(),
hasTrivialBody(), isOverloadedOperator(), cxxConstructorDecl(),
cxxDestructorDecl(), cxxConversionDecl(), isTemplate(),
isDependentContext(),
ofClass(anyOf(
isLambda(),
hasAnyDependentBases()) // Method might become virtual
// depending on template base class.
),
isInsideMacroDefinition(),
hasCanonicalDecl(isInsideMacroDefinition()), usesThis())))
.bind("x"),
this);
}
/// Obtain the original source code text from a SourceRange.
static StringRef getStringFromRange(SourceManager &SourceMgr,
const LangOptions &LangOpts,
SourceRange Range) {
if (SourceMgr.getFileID(Range.getBegin()) !=
SourceMgr.getFileID(Range.getEnd()))
return {};
return Lexer::getSourceText(CharSourceRange(Range, true), SourceMgr,
LangOpts);
}
static SourceRange getLocationOfConst(const TypeSourceInfo *TSI,
SourceManager &SourceMgr,
const LangOptions &LangOpts) {
assert(TSI);
const auto FTL = TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>();
assert(FTL);
SourceRange Range{FTL.getRParenLoc().getLocWithOffset(1),
FTL.getLocalRangeEnd()};
// Inside Range, there might be other keywords and trailing return types.
// Find the exact position of "const".
StringRef Text = getStringFromRange(SourceMgr, LangOpts, Range);
size_t Offset = Text.find("const");
if (Offset == StringRef::npos)
return {};
SourceLocation Start = Range.getBegin().getLocWithOffset(Offset);
return {Start, Start.getLocWithOffset(strlen("const") - 1)};
}
void ConvertMemberFunctionsToStatic::check(
const MatchFinder::MatchResult &Result) {
const auto *Definition = Result.Nodes.getNodeAs<CXXMethodDecl>("x");
// TODO: For out-of-line declarations, don't modify the source if the header
// is excluded by the -header-filter option.
DiagnosticBuilder Diag =
diag(Definition->getLocation(), "method %0 can be made static")
<< Definition;
// TODO: Would need to remove those in a fix-it.
if (Definition->getMethodQualifiers().hasVolatile() ||
Definition->getMethodQualifiers().hasRestrict() ||
Definition->getRefQualifier() != RQ_None)
return;
const CXXMethodDecl *Declaration = Definition->getCanonicalDecl();
if (Definition->isConst()) {
// Make sure that we either remove 'const' on both declaration and
// definition or emit no fix-it at all.
SourceRange DefConst = getLocationOfConst(Definition->getTypeSourceInfo(),
*Result.SourceManager,
Result.Context->getLangOpts());
if (DefConst.isInvalid())
return;
if (Declaration != Definition) {
SourceRange DeclConst = getLocationOfConst(
Declaration->getTypeSourceInfo(), *Result.SourceManager,
Result.Context->getLangOpts());
if (DeclConst.isInvalid())
return;
Diag << FixItHint::CreateRemoval(DeclConst);
}
// Remove existing 'const' from both declaration and definition.
Diag << FixItHint::CreateRemoval(DefConst);
}
Diag << FixItHint::CreateInsertion(Declaration->getBeginLoc(), "static ");
}
} // namespace readability
} // namespace tidy
} // namespace clang
|
