CloneDetectionTest.cpp
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//===- unittests/Analysis/CloneDetectionTest.cpp - Clone detection tests --===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Analysis/CloneDetection.h"
#include "clang/Tooling/Tooling.h"
#include "gtest/gtest.h"
namespace clang {
namespace analysis {
namespace {
class CloneDetectionVisitor
: public RecursiveASTVisitor<CloneDetectionVisitor> {
CloneDetector &Detector;
public:
explicit CloneDetectionVisitor(CloneDetector &D) : Detector(D) {}
bool VisitFunctionDecl(FunctionDecl *D) {
Detector.analyzeCodeBody(D);
return true;
}
};
/// Example constraint for testing purposes.
/// Filters out all statements that are in a function which name starts with
/// "bar".
class NoBarFunctionConstraint {
public:
void constrain(std::vector<CloneDetector::CloneGroup> &CloneGroups) {
CloneConstraint::splitCloneGroups(
CloneGroups, [](const StmtSequence &A, const StmtSequence &B) {
// Check if one of the sequences is in a function which name starts
// with "bar".
for (const StmtSequence &Arg : {A, B}) {
if (const auto *D =
dyn_cast<const FunctionDecl>(Arg.getContainingDecl())) {
if (D->getName().startswith("bar"))
return false;
}
}
return true;
});
}
};
TEST(CloneDetector, FilterFunctionsByName) {
auto ASTUnit =
clang::tooling::buildASTFromCode("void foo1(int &a1) { a1++; }\n"
"void foo2(int &a2) { a2++; }\n"
"void bar1(int &a3) { a3++; }\n"
"void bar2(int &a4) { a4++; }\n");
auto TU = ASTUnit->getASTContext().getTranslationUnitDecl();
CloneDetector Detector;
// Push all the function bodies into the detector.
CloneDetectionVisitor Visitor(Detector);
Visitor.TraverseTranslationUnitDecl(TU);
// Find clones with the usual settings, but but we want to filter out
// all statements from functions which names start with "bar".
std::vector<CloneDetector::CloneGroup> CloneGroups;
Detector.findClones(CloneGroups, NoBarFunctionConstraint(),
RecursiveCloneTypeIIHashConstraint(),
MinComplexityConstraint(2), MinGroupSizeConstraint(2),
RecursiveCloneTypeIIVerifyConstraint(),
OnlyLargestCloneConstraint());
ASSERT_EQ(CloneGroups.size(), 1u);
ASSERT_EQ(CloneGroups.front().size(), 2u);
for (auto &Clone : CloneGroups.front()) {
const auto ND = dyn_cast<const FunctionDecl>(Clone.getContainingDecl());
ASSERT_TRUE(ND != nullptr);
// Check that no function name starting with "bar" is in the results...
ASSERT_TRUE(ND->getNameAsString().find("bar") != 0);
}
// Retry above's example without the filter...
CloneGroups.clear();
Detector.findClones(CloneGroups, RecursiveCloneTypeIIHashConstraint(),
MinComplexityConstraint(2), MinGroupSizeConstraint(2),
RecursiveCloneTypeIIVerifyConstraint(),
OnlyLargestCloneConstraint());
ASSERT_EQ(CloneGroups.size(), 1u);
ASSERT_EQ(CloneGroups.front().size(), 4u);
// Count how many functions with the bar prefix we have in the results.
int FoundFunctionsWithBarPrefix = 0;
for (auto &Clone : CloneGroups.front()) {
const auto ND = dyn_cast<const FunctionDecl>(Clone.getContainingDecl());
ASSERT_TRUE(ND != nullptr);
// This time check that we picked up the bar functions from above
if (ND->getNameAsString().find("bar") == 0) {
FoundFunctionsWithBarPrefix++;
}
}
// We should have found the two functions bar1 and bar2.
ASSERT_EQ(FoundFunctionsWithBarPrefix, 2);
}
} // namespace
} // namespace analysis
} // namespace clang