NoQ added a comment.
The idea with strings as keys is curious! I've got a few more minor comments :)
================
Comment at: lib/Analysis/CloneDetection.cpp:104
@@ +103,3 @@
+ // Storage for the signatures of the direct child statements. This is only
+ // needed if the current statemnt is a CompoundStmt.
+ std::vector<CloneDetector::CloneSignature> ChildSignatures;
----------------
Typo: statement.
================
Comment at: lib/Analysis/CloneDetection.cpp:147
@@ +146,3 @@
+ const CompoundStmt *CS,
+ std::vector<CloneDetector::CloneSignature> ChildSignatures) {
+
----------------
Maybe pass `ChildSignatures` by reference?
================
Comment at: lib/Analysis/CloneDetection.cpp:178
@@ +177,3 @@
+
+ bool VisitFunctionDecl(FunctionDecl *D) {
+ // If we found a function, we start the clone search on its body statement.
----------------
You'd probably want to add `ObjCMethodDecl` and `BlockDecl`, because they
aren't sub-classes of `FunctionDecl` (and probably even tests for that).
Because this part of the code essentially re-implements `AnalysisConsumer`, (a
`RecursiveASTVisitor` that tells us what code bodies to analyze with the static
analyzer - i should've looked there earlier!!).
Alternatively, you can just rely on `AnalysisConsumer`, which would eliminate
the recursive visitor completely: {F2205103} This way you'd be analyzing
exactly the same code bodies that the analyzer itself would analyze; if you'd
want to extend to various declarations, you'd be able to do that by subscribing
on `check::ASTDecl`. But i dare not to predict what kind of different
flexibility you'd need next.
================
Comment at: lib/Analysis/CloneDetection.cpp:188
@@ +187,3 @@
+void CloneDetector::analyzeTranslationUnit(TranslationUnitDecl *TU) {
+ DataCollectVisitor visitor(*this, TU->getASTContext());
+ visitor.TraverseDecl(TU);
----------------
Micro-nit: Capitalize 'V' in 'visitor'?
https://reviews.llvm.org/D20795
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