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//===--- CloneChecker.cpp - Clone detection checker -------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// CloneChecker is a checker that reports clones in the current translation
/// unit.
///
//===----------------------------------------------------------------------===//
#include "ClangSACheckers.h"
#include "clang/Analysis/CloneDetection.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/StaticAnalyzer/Core/Checker.h"
#include "clang/StaticAnalyzer/Core/CheckerManager.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
using namespace clang;
using namespace ento;
namespace {
class CloneChecker
: public Checker<check::ASTCodeBody, check::EndOfTranslationUnit> {
mutable CloneDetector Detector;
public:
void checkASTCodeBody(const Decl *D, AnalysisManager &Mgr,
BugReporter &BR) const;
void checkEndOfTranslationUnit(const TranslationUnitDecl *TU,
AnalysisManager &Mgr, BugReporter &BR) const;
};
} // end anonymous namespace
void CloneChecker::checkASTCodeBody(const Decl *D, AnalysisManager &Mgr,
BugReporter &BR) const {
// Every statement that should be included in the search for clones needs to
// be passed to the CloneDetector.
Detector.analyzeCodeBody(D);
}
void CloneChecker::checkEndOfTranslationUnit(const TranslationUnitDecl *TU,
AnalysisManager &Mgr,
BugReporter &BR) const {
// At this point, every statement in the translation unit has been analyzed by
// the CloneDetector. The only thing left to do is to report the found clones.
int MinComplexity = Mgr.getAnalyzerOptions().getOptionAsInteger(
"MinimumCloneComplexity", 10, this);
assert(MinComplexity >= 0);
SourceManager &SM = BR.getSourceManager();
std::vector<CloneDetector::CloneGroup> CloneGroups;
Detector.findClones(CloneGroups, MinComplexity);
DiagnosticsEngine &DiagEngine = Mgr.getDiagnostic();
unsigned WarnID = DiagEngine.getCustomDiagID(DiagnosticsEngine::Warning,
"Detected code clone.");
unsigned NoteID = DiagEngine.getCustomDiagID(DiagnosticsEngine::Note,
"Related code clone is here.");
for (CloneDetector::CloneGroup &Group : CloneGroups) {
// For readability reasons we sort the clones by line numbers.
std::sort(Group.Sequences.begin(), Group.Sequences.end(),
[&SM](const StmtSequence &LHS, const StmtSequence &RHS) {
return SM.isBeforeInTranslationUnit(LHS.getStartLoc(),
RHS.getStartLoc()) &&
SM.isBeforeInTranslationUnit(LHS.getEndLoc(),
RHS.getEndLoc());
});
// We group the clones by printing the first as a warning and all others
// as a note.
DiagEngine.Report(Group.Sequences.front().getStartLoc(), WarnID);
for (unsigned i = 1; i < Group.Sequences.size(); ++i) {
DiagEngine.Report(Group.Sequences[i].getStartLoc(), NoteID);
}
}
}
//===----------------------------------------------------------------------===//
// Register CloneChecker
//===----------------------------------------------------------------------===//
void ento::registerCloneChecker(CheckerManager &Mgr) {
Mgr.registerChecker<CloneChecker>();
}
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