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[clang-tidy] Simplify function complexity check 

Update test to note use of lambda instead of the invisible operator().

Differential Revision: https://reviews.llvm.org/D96131
This commit is contained in:
Stephen Kelly 2020-12-26 21:40:51 +00:00
parent 038bd14712
commit 6852a29a3b
3 changed files with 26 additions and 10 deletions
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31
clang-tools-extra/clang-tidy/readability/FunctionCognitiveComplexityCheck.cpp
View File

@ -502,27 +502,40 @@ void FunctionCognitiveComplexityCheck::storeOptions(
void FunctionCognitiveComplexityCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
functionDecl(isDefinition(),
unless(anyOf(isDefaulted(), isDeleted(), isImplicit(),
isInstantiated(), isWeak())))
unless(anyOf(isDefaulted(), isDeleted(), isWeak())))
.bind("func"),
this);
Finder->addMatcher(lambdaExpr().bind("lambda"), this);
}
void FunctionCognitiveComplexityCheck::check(
const MatchFinder::MatchResult &Result) {
const auto *Func = Result.Nodes.getNodeAs<FunctionDecl>("func");
assert(Func->hasBody() && "The matchers should only match the functions that "
"have user-provided body.");
FunctionASTVisitor Visitor;
Visitor.TraverseDecl(const_cast<FunctionDecl *>(Func), true);
SourceLocation Loc;
const auto *TheDecl = Result.Nodes.getNodeAs<FunctionDecl>("func");
const auto *TheLambdaExpr = Result.Nodes.getNodeAs<LambdaExpr>("lambda");
if (TheDecl) {
assert(TheDecl->hasBody() &&
"The matchers should only match the functions that "
"have user-provided body.");
Loc = TheDecl->getLocation();
Visitor.TraverseDecl(const_cast<FunctionDecl *>(TheDecl), true);
} else {
Loc = TheLambdaExpr->getBeginLoc();
Visitor.TraverseLambdaExpr(const_cast<LambdaExpr *>(TheLambdaExpr));
}
if (Visitor.CC.Total <= Threshold)
return;
diag(Func->getLocation(),
"function %0 has cognitive complexity of %1 (threshold %2)")
<< Func << Visitor.CC.Total << Threshold;
if (TheDecl)
diag(Loc, "function %0 has cognitive complexity of %1 (threshold %2)")
<< TheDecl << Visitor.CC.Total << Threshold;
else
diag(Loc, "lambda has cognitive complexity of %0 (threshold %1)")
<< Visitor.CC.Total << Threshold;
// Output all the basic increments of complexity.
for (const auto &Detail : Visitor.CC.Details) {

3
clang-tools-extra/clang-tidy/readability/FunctionCognitiveComplexityCheck.h
View File

@ -31,6 +31,9 @@ public:
void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
void registerMatchers(ast_matchers::MatchFinder *Finder) override;
void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
llvm::Optional<TraversalKind> getCheckTraversalKind() const override {
return TK_IgnoreUnlessSpelledInSource;
}
private:
const unsigned Threshold;

2
clang-tools-extra/test/clang-tidy/checkers/readability-function-cognitive-complexity.cpp
View File

@ -666,7 +666,7 @@ void unittest_b2_08_02() {
// CHECK-NOTES: :[[@LINE-1]]:5: note: +2, including nesting penalty of 1, nesting level increased to 2{{$}}
}
};
// CHECK-NOTES: :[[@LINE-6]]:14: warning: function 'operator()' has cognitive complexity of 1 (threshold 0) [readability-function-cognitive-complexity]
// CHECK-NOTES: :[[@LINE-6]]:14: warning: lambda has cognitive complexity of 1 (threshold 0) [readability-function-cognitive-complexity]
// CHECK-NOTES: :[[@LINE-5]]:5: note: +1, including nesting penalty of 0, nesting level increased to 1{{$}}
}