clang 10.0.0git

CloneDetection.h
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1 //===--- CloneDetection.h - Finds code clones in an AST ---------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 ///
9 /// \file
10 /// This file defines classes for searching and analyzing source code clones.
11 ///
12 //===----------------------------------------------------------------------===//
13
14 #ifndef LLVM_CLANG_AST_CLONEDETECTION_H
15 #define LLVM_CLANG_AST_CLONEDETECTION_H
16
17 #include "clang/AST/StmtVisitor.h"
18 #include "llvm/Support/Regex.h"
19 #include <vector>
20
21 namespace clang {
22
23 class Stmt;
24 class Decl;
25 class VarDecl;
26 class ASTContext;
27 class CompoundStmt;
28
29 /// Identifies a list of statements.
30 ///
31 /// Can either identify a single arbitrary Stmt object, a continuous sequence of
32 /// child statements inside a CompoundStmt or no statements at all.
33 class StmtSequence {
34 /// If this object identifies a sequence of statements inside a CompoundStmt,
35 /// S points to this CompoundStmt. If this object only identifies a single
36 /// Stmt, then S is a pointer to this Stmt.
37 const Stmt *S;
38
39 /// The declaration that contains the statements.
40 const Decl *D;
41
42 /// If EndIndex is non-zero, then S is a CompoundStmt and this StmtSequence
43 /// instance is representing the CompoundStmt children inside the array
44 /// [StartIndex, EndIndex).
45 unsigned StartIndex;
46 unsigned EndIndex;
47
48 public:
49 /// Constructs a StmtSequence holding multiple statements.
50 ///
51 /// The resulting StmtSequence identifies a continuous sequence of statements
52 /// in the body of the given CompoundStmt. Which statements of the body should
53 /// be identified needs to be specified by providing a start and end index
54 /// that describe a non-empty sub-array in the body of the given CompoundStmt.
55 ///
56 /// \param Stmt A CompoundStmt that contains all statements in its body.
57 /// \param D The Decl containing this Stmt.
58 /// \param StartIndex The inclusive start index in the children array of
59 /// \p Stmt
60 /// \param EndIndex The exclusive end index in the children array of \p Stmt.
61 StmtSequence(const CompoundStmt *Stmt, const Decl *D, unsigned StartIndex,
62 unsigned EndIndex);
63
64 /// Constructs a StmtSequence holding a single statement.
65 ///
66 /// \param Stmt An arbitrary Stmt.
67 /// \param D The Decl containing this Stmt.
68 StmtSequence(const Stmt *Stmt, const Decl *D);
69
70 /// Constructs an empty StmtSequence.
71 StmtSequence();
72
73 typedef const Stmt *const *iterator;
74
75 /// Returns an iterator pointing to the first statement in this sequence.
76 iterator begin() const;
77
78 /// Returns an iterator pointing behind the last statement in this sequence.
79 iterator end() const;
80
81 /// Returns the first statement in this sequence.
82 ///
83 /// This method should only be called on a non-empty StmtSequence object.
84 const Stmt *front() const {
85 assert(!empty());
86 return begin()[0];
87 }
88
89 /// Returns the last statement in this sequence.
90 ///
91 /// This method should only be called on a non-empty StmtSequence object.
92 const Stmt *back() const {
93 assert(!empty());
94 return begin()[size() - 1];
95 }
96
97 /// Returns the number of statements this object holds.
98 unsigned size() const {
99 if (holdsSequence())
100 return EndIndex - StartIndex;
101 if (S == nullptr)
102 return 0;
103 return 1;
104 }
105
106 /// Returns true if and only if this StmtSequence contains no statements.
107 bool empty() const { return size() == 0; }
108
109 /// Returns the related ASTContext for the stored Stmts.
110 ASTContext &getASTContext() const;
111
112 /// Returns the declaration that contains the stored Stmts.
113 const Decl *getContainingDecl() const {
114 assert(D);
115 return D;
116 }
117
118 /// Returns true if this objects holds a list of statements.
119 bool holdsSequence() const { return EndIndex != 0; }
120
121 /// Returns the start sourcelocation of the first statement in this sequence.
122 ///
123 /// This method should only be called on a non-empty StmtSequence object.
124 SourceLocation getBeginLoc() const;
125
126 /// Returns the end sourcelocation of the last statement in this sequence.
127 ///
128 /// This method should only be called on a non-empty StmtSequence object.
129 SourceLocation getEndLoc() const;
130
131 /// Returns the source range of the whole sequence - from the beginning
132 /// of the first statement to the end of the last statement.
133 SourceRange getSourceRange() const;
134
135 bool operator==(const StmtSequence &Other) const {
136 return std::tie(S, StartIndex, EndIndex) ==
137 std::tie(Other.S, Other.StartIndex, Other.EndIndex);
138 }
139
140 bool operator!=(const StmtSequence &Other) const {
141 return std::tie(S, StartIndex, EndIndex) !=
142 std::tie(Other.S, Other.StartIndex, Other.EndIndex);
143 }
144
145 /// Returns true if and only if this sequence covers a source range that
146 /// contains the source range of the given sequence \p Other.
147 ///
148 /// This method should only be called on a non-empty StmtSequence object
149 /// and passed a non-empty StmtSequence object.
150 bool contains(const StmtSequence &Other) const;
151 };
152
153 /// Searches for similar subtrees in the AST.
154 ///
155 /// First, this class needs several declarations with statement bodies which
156 /// can be passed via analyzeCodeBody. Afterwards all statements can be
157 /// searched for clones by calling findClones with a given list of constraints
158 /// that should specify the wanted properties of the clones.
159 ///
160 /// The result of findClones can be further constrained with the constrainClones
161 /// method.
162 ///
163 /// This class only searches for clones in executable source code
164 /// (e.g. function bodies). Other clones (e.g. cloned comments or declarations)
165 /// are not supported.
166 class CloneDetector {
167
168 public:
169 /// A collection of StmtSequences that share an arbitrary property.
170 typedef llvm::SmallVector<StmtSequence, 8> CloneGroup;
171
172 /// Generates and stores search data for all statements in the body of
173 /// the given Decl.
174 void analyzeCodeBody(const Decl *D);
175
176 /// Constrains the given list of clone groups with the given constraint.
177 ///
178 /// The constraint is expected to have a method with the signature
179 /// `void constrain(std::vector<CloneDetector::CloneGroup> &Sequences)`
180 /// as this is the interface that the CloneDetector uses for applying the
181 /// constraint. The constraint is supposed to directly modify the passed list
182 /// so that all clones in the list fulfill the specific property this
183 /// constraint ensures.
184 template <typename T>
185 static void constrainClones(std::vector<CloneGroup> &CloneGroups, T C) {
186 C.constrain(CloneGroups);
187 }
188
189 /// Constrains the given list of clone groups with the given list of
190 /// constraints.
191 ///
192 /// The constraints are applied in sequence in the order in which they are
193 /// passed to this function.
194 template <typename T1, typename... Ts>
195 static void constrainClones(std::vector<CloneGroup> &CloneGroups, T1 C,
196 Ts... ConstraintList) {
197 constrainClones(CloneGroups, C);
198 constrainClones(CloneGroups, ConstraintList...);
199 }
200
201 /// Searches for clones in all previously passed statements.
202 /// \param Result Output parameter to which all created clone groups are
203 /// added.
204 /// \param ConstraintList The constraints that should be applied to the
205 // result.
206 template <typename... Ts>
207 void findClones(std::vector<CloneGroup> &Result, Ts... ConstraintList) {
208 // The initial assumption is that there is only one clone group and every
209 // statement is a clone of the others. This clone group will then be
210 // split up with the help of the constraints.
211 CloneGroup AllClones;
212 AllClones.reserve(Sequences.size());
213 for (const auto &C : Sequences) {
214 AllClones.push_back(C);
215 }
216
217 Result.push_back(AllClones);
218
219 constrainClones(Result, ConstraintList...);
220 }
221
222 private:
223 CloneGroup Sequences;
224 };
225
226 /// This class is a utility class that contains utility functions for building
227 /// custom constraints.
228 class CloneConstraint {
229 public:
230 /// Removes all groups by using a filter function.
231 /// \param CloneGroups The list of CloneGroups that is supposed to be
232 /// filtered.
233 /// \param Filter The filter function that should return true for all groups
234 /// that should be removed from the list.
235 static void filterGroups(
236 std::vector<CloneDetector::CloneGroup> &CloneGroups,
237 llvm::function_ref<bool(const CloneDetector::CloneGroup &)> Filter) {
238 CloneGroups.erase(
239 std::remove_if(CloneGroups.begin(), CloneGroups.end(), Filter),
240 CloneGroups.end());
241 }
242
243 /// Splits the given CloneGroups until the given Compare function returns true
244 /// for all clones in a single group.
245 /// \param CloneGroups A list of CloneGroups that should be modified.
246 /// \param Compare The comparison function that all clones are supposed to
247 /// pass. Should return true if and only if two clones belong
248 /// to the same CloneGroup.
249 static void splitCloneGroups(
250 std::vector<CloneDetector::CloneGroup> &CloneGroups,
251 llvm::function_ref<bool(const StmtSequence &, const StmtSequence &)>
252 Compare);
253 };
254
255 /// This constraint moves clones into clone groups of type II via hashing.
256 ///
257 /// Clones with different hash values are moved into separate clone groups.
258 /// Collisions are possible, and this constraint does nothing to address this
259 /// them. Add the slower RecursiveCloneTypeIIVerifyConstraint later in the
260 /// constraint chain, not necessarily immediately, to eliminate hash collisions
261 /// through a more detailed analysis.
262 class RecursiveCloneTypeIIHashConstraint {
263 public:
264 void constrain(std::vector<CloneDetector::CloneGroup> &Sequences);
265 };
266
267 /// This constraint moves clones into clone groups of type II by comparing them.
268 ///
269 /// Clones that aren't type II clones are moved into separate clone groups.
270 /// In contrast to the RecursiveCloneTypeIIHashConstraint, all clones in a clone
271 /// group are guaranteed to be be type II clones of each other, but it is too
272 /// slow to efficiently handle large amounts of clones.
273 class RecursiveCloneTypeIIVerifyConstraint {
274 public:
275 void constrain(std::vector<CloneDetector::CloneGroup> &Sequences);
276 };
277
278 /// Ensures that every clone has at least the given complexity.
279 ///
280 /// Complexity is here defined as the total amount of children of a statement.
281 /// This constraint assumes the first statement in the group is representative
282 /// for all other statements in the group in terms of complexity.
283 class MinComplexityConstraint {
284 unsigned MinComplexity;
285
286 public:
287 MinComplexityConstraint(unsigned MinComplexity)
288 : MinComplexity(MinComplexity) {}
289
290 /// Calculates the complexity of the given StmtSequence.
291 /// \param Limit The limit of complexity we probe for. After reaching
292 /// this limit during calculation, this method is exiting
293 /// early to improve performance and returns this limit.
294 size_t calculateStmtComplexity(const StmtSequence &Seq, std::size_t Limit,
295 const std::string &ParentMacroStack = "");
296
297 void constrain(std::vector<CloneDetector::CloneGroup> &CloneGroups) {
298 CloneConstraint::filterGroups(
299 CloneGroups, [this](const CloneDetector::CloneGroup &A) {
300 if (!A.empty())
301 return calculateStmtComplexity(A.front(), MinComplexity) <
302 MinComplexity;
303 else
304 return false;
305 });
306 }
307 };
308
309 /// Ensures that all clone groups contain at least the given amount of clones.
310 class MinGroupSizeConstraint {
311 unsigned MinGroupSize;
312
313 public:
314 MinGroupSizeConstraint(unsigned MinGroupSize = 2)
315 : MinGroupSize(MinGroupSize) {}
316
317 void constrain(std::vector<CloneDetector::CloneGroup> &CloneGroups) {
318 CloneConstraint::filterGroups(CloneGroups,
319 [this](const CloneDetector::CloneGroup &A) {
320 return A.size() < MinGroupSize;
321 });
322 }
323 };
324
325 /// Ensures that no clone group fully contains another clone group.
326 struct OnlyLargestCloneConstraint {
327 void constrain(std::vector<CloneDetector::CloneGroup> &Result);
328 };
329
330 struct FilenamePatternConstraint {
331 StringRef IgnoredFilesPattern;
332 std::shared_ptr<llvm::Regex> IgnoredFilesRegex;
333
334 FilenamePatternConstraint(StringRef IgnoredFilesPattern)
335 : IgnoredFilesPattern(IgnoredFilesPattern) {
336 IgnoredFilesRegex = std::make_shared<llvm::Regex>("^(" +
337 IgnoredFilesPattern.str() + "$)");
338 }
339
340 bool isAutoGenerated(const CloneDetector::CloneGroup &Group);
341
342 void constrain(std::vector<CloneDetector::CloneGroup> &CloneGroups) {
343 CloneConstraint::filterGroups(
344 CloneGroups, [this](const CloneDetector::CloneGroup &Group) {
345 return isAutoGenerated(Group);
346 });
347 }
348 };
349
350 /// Analyzes the pattern of the referenced variables in a statement.
351 class VariablePattern {
352
353 /// Describes an occurrence of a variable reference in a statement.
354 struct VariableOccurence {
355 /// The index of the associated VarDecl in the Variables vector.
356 size_t KindID;
357 /// The statement in the code where the variable was referenced.
358 const Stmt *Mention;
359
360 VariableOccurence(size_t KindID, const Stmt *Mention)
361 : KindID(KindID), Mention(Mention) {}
362 };
363
364 /// All occurrences of referenced variables in the order of appearance.
365 std::vector<VariableOccurence> Occurences;
366 /// List of referenced variables in the order of appearance.
367 /// Every item in this list is unique.
368 std::vector<const VarDecl *> Variables;
369
370 /// Adds a new variable referenced to this pattern.
371 /// \param VarDecl The declaration of the variable that is referenced.
372 /// \param Mention The SourceRange where this variable is referenced.
373 void addVariableOccurence(const VarDecl *VarDecl, const Stmt *Mention);
374
375 /// Adds each referenced variable from the given statement.
376 void addVariables(const Stmt *S);
377
378 public:
379 /// Creates an VariablePattern object with information about the given
380 /// StmtSequence.
381 VariablePattern(const StmtSequence &Sequence) {
382 for (const Stmt *S : Sequence)
383 addVariables(S);
384 }
385
386 /// Describes two clones that reference their variables in a different pattern
387 /// which could indicate a programming error.
388 struct SuspiciousClonePair {
389 /// Utility class holding the relevant information about a single
390 /// clone in this pair.
391 struct SuspiciousCloneInfo {
392 /// The variable which referencing in this clone was against the pattern.
393 const VarDecl *Variable;
394 /// Where the variable was referenced.
395 const Stmt *Mention;
396 /// The variable that should have been referenced to follow the pattern.
397 /// If Suggestion is a nullptr then it's not possible to fix the pattern
398 /// by referencing a different variable in this clone.
399 const VarDecl *Suggestion;
400 SuspiciousCloneInfo(const VarDecl *Variable, const Stmt *Mention,
401 const VarDecl *Suggestion)
402 : Variable(Variable), Mention(Mention), Suggestion(Suggestion) {}
403 SuspiciousCloneInfo() {}
404 };
405 /// The first clone in the pair which always has a suggested variable.
406 SuspiciousCloneInfo FirstCloneInfo;
407 /// This other clone in the pair which can have a suggested variable.
408 SuspiciousCloneInfo SecondCloneInfo;
409 };
410
411 /// Counts the differences between this pattern and the given one.
412 /// \param Other The given VariablePattern to compare with.
413 /// \param FirstMismatch Output parameter that will be filled with information
414 /// about the first difference between the two patterns. This parameter
415 /// can be a nullptr, in which case it will be ignored.
416 /// \return Returns the number of differences between the pattern this object
417 /// is following and the given VariablePattern.
418 ///
419 /// For example, the following statements all have the same pattern and this
420 /// function would return zero:
421 ///
422 /// if (a < b) return a; return b;
423 /// if (x < y) return x; return y;
424 /// if (u2 < u1) return u2; return u1;
425 ///
426 /// But the following statement has a different pattern (note the changed
427 /// variables in the return statements) and would have two differences when
428 /// compared with one of the statements above.
429 ///
430 /// if (a < b) return b; return a;
431 ///
432 /// This function should only be called if the related statements of the given
433 /// pattern and the statements of this objects are clones of each other.
434 unsigned countPatternDifferences(
435 const VariablePattern &Other,
436 VariablePattern::SuspiciousClonePair *FirstMismatch = nullptr);
437 };
438
439 /// Ensures that all clones reference variables in the same pattern.
440 struct MatchingVariablePatternConstraint {
441 void constrain(std::vector<CloneDetector::CloneGroup> &CloneGroups);
442 };
443
444 } // end namespace clang
445
446 #endif // LLVM_CLANG_AST_CLONEDETECTION_H
clang::FilenamePatternConstraint::FilenamePatternConstraint
FilenamePatternConstraint(StringRef IgnoredFilesPattern)
Definition: CloneDetection.h:334
clang::StmtSequence::getEndLoc
SourceLocation getEndLoc() const
Returns the end sourcelocation of the last statement in this sequence.
Definition: CloneDetection.cpp:83
clang::Stmt
Stmt - This represents one statement.
Definition: Stmt.h:66
clang::StmtSequence::getASTContext
ASTContext & getASTContext() const
Returns the related ASTContext for the stored Stmts.
Definition: CloneDetection.cpp:74
clang::StmtSequence::getSourceRange
SourceRange getSourceRange() const
Returns the source range of the whole sequence - from the beginning of the first statement to the end...
Definition: CloneDetection.cpp:85
clang::VariablePattern
Analyzes the pattern of the referenced variables in a statement.
Definition: CloneDetection.h:351
clang::Decl
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:88
clang::StmtSequence::front
const Stmt * front() const
Returns the first statement in this sequence.
Definition: CloneDetection.h:84
clang::CodeGen::AlignmentSource::Decl
The l-value was an access to a declared entity or something equivalently strong, like the address of ...
clang::StmtSequence::operator!=
bool operator!=(const StmtSequence &Other) const
Definition: CloneDetection.h:140
clang::StmtSequence::operator==
bool operator==(const StmtSequence &Other) const
Definition: CloneDetection.h:135
clang::MinGroupSizeConstraint::constrain
void constrain(std::vector< CloneDetector::CloneGroup > &CloneGroups)
Definition: CloneDetection.h:317
clang::VarDecl
Represents a variable declaration or definition.
Definition: Decl.h:820
clang::StmtSequence::StmtSequence
StmtSequence()
Constructs an empty StmtSequence.
Definition: CloneDetection.cpp:33
clang::VariablePattern::SuspiciousClonePair::SuspiciousCloneInfo::SuspiciousCloneInfo
SuspiciousCloneInfo(const VarDecl *Variable, const Stmt *Mention, const VarDecl *Suggestion)
Definition: CloneDetection.h:400
clang::StmtSequence::begin
iterator begin() const
Returns an iterator pointing to the first statement in this sequence.
Definition: CloneDetection.cpp:58
clang::StmtSequence
Identifies a list of statements.
Definition: CloneDetection.h:33
clang::ASTContext
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:168
clang::CloneConstraint
This class is a utility class that contains utility functions for building custom constraints...
Definition: CloneDetection.h:228
clang::MatchingVariablePatternConstraint
Ensures that all clones reference variables in the same pattern.
Definition: CloneDetection.h:440
size_t
__SIZE_TYPE__ size_t
The unsigned integer type of the result of the sizeof operator.
Definition: opencl-c-base.h:40
clang::MinGroupSizeConstraint
Ensures that all clone groups contain at least the given amount of clones.
Definition: CloneDetection.h:310
clang::CloneDetector::constrainClones
static void constrainClones(std::vector< CloneGroup > &CloneGroups, T C)
Constrains the given list of clone groups with the given constraint.
Definition: CloneDetection.h:185
clang::VariablePattern::VariablePattern
VariablePattern(const StmtSequence &Sequence)
Creates an VariablePattern object with information about the given StmtSequence.
Definition: CloneDetection.h:381
clang::CloneDetector::findClones
void findClones(std::vector< CloneGroup > &Result, Ts... ConstraintList)
Searches for clones in all previously passed statements.
Definition: CloneDetection.h:207
clang::StmtSequence::end
iterator end() const
Returns an iterator pointing behind the last statement in this sequence.
Definition: CloneDetection.cpp:66
clang::CloneDetector
Searches for similar subtrees in the AST.
Definition: CloneDetection.h:166
clang::MinComplexityConstraint::constrain
void constrain(std::vector< CloneDetector::CloneGroup > &CloneGroups)
Definition: CloneDetection.h:297
clang::StmtSequence::empty
bool empty() const
Returns true if and only if this StmtSequence contains no statements.
Definition: CloneDetection.h:107
clang::VariablePattern::SuspiciousClonePair
Describes two clones that reference their variables in a different pattern which could indicate a pro...
Definition: CloneDetection.h:388
clang::CompoundStmt
CompoundStmt - This represents a group of statements like { stmt stmt }.
Definition: Stmt.h:1332
clang::CloneDetector::CloneGroup
llvm::SmallVector< StmtSequence, 8 > CloneGroup
A collection of StmtSequences that share an arbitrary property.
Definition: CloneDetection.h:170
clang::RecursiveCloneTypeIIHashConstraint
This constraint moves clones into clone groups of type II via hashing.
Definition: CloneDetection.h:262
clang::VariablePattern::SuspiciousClonePair::SuspiciousCloneInfo::SuspiciousCloneInfo
SuspiciousCloneInfo()
Definition: CloneDetection.h:403
clang::VariablePattern::SuspiciousClonePair::SecondCloneInfo
SuspiciousCloneInfo SecondCloneInfo
This other clone in the pair which can have a suggested variable.
Definition: CloneDetection.h:408
clang::StmtSequence::getContainingDecl
const Decl * getContainingDecl() const
Returns the declaration that contains the stored Stmts.
Definition: CloneDetection.h:113
clang::RecursiveCloneTypeIIVerifyConstraint
This constraint moves clones into clone groups of type II by comparing them.
Definition: CloneDetection.h:273
clang::FilenamePatternConstraint::IgnoredFilesPattern
StringRef IgnoredFilesPattern
Definition: CloneDetection.h:331
clang::MinComplexityConstraint
Ensures that every clone has at least the given complexity.
Definition: CloneDetection.h:283
clang::VariablePattern::SuspiciousClonePair::SuspiciousCloneInfo::Suggestion
const VarDecl * Suggestion
The variable that should have been referenced to follow the pattern.
Definition: CloneDetection.h:399
StmtVisitor.h
clang::ObjCSubstitutionContext::Result
The result type of a method or function.
clang::FilenamePatternConstraint::IgnoredFilesRegex
std::shared_ptr< llvm::Regex > IgnoredFilesRegex
Definition: CloneDetection.h:332
clang::VariablePattern::SuspiciousClonePair::SuspiciousCloneInfo
Utility class holding the relevant information about a single clone in this pair. ...
Definition: CloneDetection.h:391
clang::VariablePattern::SuspiciousClonePair::SuspiciousCloneInfo::Mention
const Stmt * Mention
Where the variable was referenced.
Definition: CloneDetection.h:395
clang::tooling::Filter
llvm::cl::opt< std::string > Filter
clang::StmtSequence::size
unsigned size() const
Returns the number of statements this object holds.
Definition: CloneDetection.h:98
clang::CloneDetector::constrainClones
static void constrainClones(std::vector< CloneGroup > &CloneGroups, T1 C, Ts... ConstraintList)
Constrains the given list of clone groups with the given list of constraints.
Definition: CloneDetection.h:195
clang::MinComplexityConstraint::MinComplexityConstraint
MinComplexityConstraint(unsigned MinComplexity)
Definition: CloneDetection.h:287
clang::SourceLocation
Encodes a location in the source.
Definition: SourceLocation.h:86
clang::StmtSequence::iterator
const Stmt *const * iterator
Definition: CloneDetection.h:73
llvm::SmallVector< StmtSequence, 8 >
clang::StmtSequence::holdsSequence
bool holdsSequence() const
Returns true if this objects holds a list of statements.
Definition: CloneDetection.h:119
clang::FilenamePatternConstraint::constrain
void constrain(std::vector< CloneDetector::CloneGroup > &CloneGroups)
Definition: CloneDetection.h:342
clang::FilenamePatternConstraint
Definition: CloneDetection.h:330
clang::interp::Compare
ComparisonCategoryResult Compare(const T &X, const T &Y)
Helper to compare two comparable types.
Definition: Integral.h:32
clang
Dataflow Directional Tag Classes.
Definition: CFGReachabilityAnalysis.h:21
clang::StmtSequence::back
const Stmt * back() const
Returns the last statement in this sequence.
Definition: CloneDetection.h:92
clang::StmtSequence::getBeginLoc
SourceLocation getBeginLoc() const
Returns the start sourcelocation of the first statement in this sequence.
Definition: CloneDetection.cpp:79
clang::MinGroupSizeConstraint::MinGroupSizeConstraint
MinGroupSizeConstraint(unsigned MinGroupSize=2)
Definition: CloneDetection.h:314
clang::StmtSequence::contains
bool contains(const StmtSequence &Other) const
Returns true if and only if this sequence covers a source range that contains the source range of the...
Definition: CloneDetection.cpp:36
clang::AttrSyntax::C
clang::CloneConstraint::filterGroups
static void filterGroups(std::vector< CloneDetector::CloneGroup > &CloneGroups, llvm::function_ref< bool(const CloneDetector::CloneGroup &)> Filter)
Removes all groups by using a filter function.
Definition: CloneDetection.h:235
clang::VariablePattern::SuspiciousClonePair::FirstCloneInfo
SuspiciousCloneInfo FirstCloneInfo
The first clone in the pair which always has a suggested variable.
Definition: CloneDetection.h:406
clang::SourceRange
A trivial tuple used to represent a source range.
Definition: SourceLocation.h:207
clang::VariablePattern::SuspiciousClonePair::SuspiciousCloneInfo::Variable
const VarDecl * Variable
The variable which referencing in this clone was against the pattern.
Definition: CloneDetection.h:393
clang::OnlyLargestCloneConstraint
Ensures that no clone group fully contains another clone group.
Definition: CloneDetection.h:326