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[clang-tidy] use CHECK-NOTES in bugprone-unused-return-value
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Authored by JonasToth on Sep 17 2018, 12:42 PM.

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aaron.ballman
alexfh
hokein

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rG5a851f313255: [clang-tidy] use CHECK-NOTES in bugprone-unused-return-value
rCTE342468: [clang-tidy] use CHECK-NOTES in bugprone-unused-return-value
rL342468: [clang-tidy] use CHECK-NOTES in bugprone-unused-return-value

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Buildable 22737
Build 22737: arc lint + arc unit

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JonasToth created this revision.Sep 17 2018, 12:42 PM

Herald added subscribers: cfe-commits, xazax.hun. · View Herald TranscriptSep 17 2018, 12:42 PM

LG with a comment.

test/clang-tidy/bugprone-unused-return-value.cpp
81	I'd probably cut repeated parts of the pattern (starting from the second one) to make them fit 80 characters, e.g. like this: // CHECK-NOTES: [[@LINE-1]]:3: warning: the value {{.*}} should be used Same for the notes.

This revision is now accepted and ready to land.Sep 18 2018, 2:23 AM

shorten warning checks

JonasToth marked an inline comment as done.Sep 18 2018, 3:44 AM

Harbormaster completed remote builds in B22780: Diff 165926.Sep 18 2018, 3:45 AM

Closed by commit rL342468: [clang-tidy] use CHECK-NOTES in bugprone-unused-return-value (authored by JonasToth). · Explain WhySep 18 2018, 4:50 AM

This revision was automatically updated to reflect the committed changes.

Herald added a subscriber: llvm-commits. · View Herald TranscriptSep 18 2018, 4:50 AM

Revision Contents

Path

Size

test/

clang-tidy/

bugprone-unused-return-value-custom.cpp

24 lines

bugprone-unused-return-value.cpp

69 lines

Diff 165808

test/clang-tidy/bugprone-unused-return-value-custom.cpp

	Show First 20 Lines • Show All 41 Lines • ▼ Show 20 Lines

	} // namespace ns			} // namespace ns

	int fun();			int fun();
	void fun(int);			void fun(int);

	void warning() {			void warning() {
	fun();			fun();
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	(fun());			(fun());
	// CHECK-MESSAGES: [[@LINE-1]]:4: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:4: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:4: note: cast the expression to void to silence this warning

	ns::Outer::Inner ObjA1;			ns::Outer::Inner ObjA1;
	ObjA1.memFun();			ObjA1.memFun();
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	ns::AliasName::Inner ObjA2;			ns::AliasName::Inner ObjA2;
	ObjA2.memFun();			ObjA2.memFun();
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	ns::Derived ObjA3;			ns::Derived ObjA3;
	ObjA3.memFun();			ObjA3.memFun();
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	ns::Type::staticFun();			ns::Type::staticFun();
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	ns::ClassTemplate<int> ObjA4;			ns::ClassTemplate<int> ObjA4;
	ObjA4.memFun();			ObjA4.memFun();
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	ns::ClassTemplate<int>::staticFun();			ns::ClassTemplate<int>::staticFun();
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning
	}			}

	void noWarning() {			void noWarning() {
	auto R1 = fun();			auto R1 = fun();

	ns::Outer::Inner ObjB1;			ns::Outer::Inner ObjB1;
	auto R2 = ObjB1.memFun();			auto R2 = ObjB1.memFun();

	Show All 17 Lines

test/clang-tidy/bugprone-unused-return-value.cpp

	Show First 20 Lines • Show All 68 Lines • ▼ Show 20 Lines
	int increment(int i) {			int increment(int i) {
	return i + 1;			return i + 1;
	}			}

	void useFuture(const std::future &fut);			void useFuture(const std::future &fut);

	void warning() {			void warning() {
	std::async(increment, 42);			std::async(increment, 42);
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	std::async(std::launch::async, increment, 42);			std::async(std::launch::async, increment, 42);
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				alexfhUnsubmitted Done Reply Inline Actions I'd probably cut repeated parts of the pattern (starting from the second one) to make them fit 80 characters, e.g. like this: // CHECK-NOTES: [[@LINE-1]]:3: warning: the value {{.}} should be used Same for the notes. alexfh:* I'd probably cut repeated parts of the pattern (starting from the second one) to make them fit…
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	Foo F;			Foo F;
	std::launder(&F);			std::launder(&F);
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	std::remove(nullptr, nullptr, 1);			std::remove(nullptr, nullptr, 1);
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	std::remove_if(nullptr, nullptr, nullptr);			std::remove_if(nullptr, nullptr, nullptr);
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	std::unique(nullptr, nullptr);			std::unique(nullptr, nullptr);
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	std::unique_ptr<Foo> UPtr;			std::unique_ptr<Foo> UPtr;
	UPtr.release();			UPtr.release();
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	std::string Str;			std::string Str;
	Str.empty();			Str.empty();
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	std::vector<Foo> Vec;			std::vector<Foo> Vec;
	Vec.empty();			Vec.empty();
	// CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning

	// test discarding return values inside different kinds of statements			// test discarding return values inside different kinds of statements

	auto Lambda = [] { std::remove(nullptr, nullptr, 1); };			auto Lambda = [] { std::remove(nullptr, nullptr, 1); };
	// CHECK-MESSAGES: [[@LINE-1]]:22: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:22: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:22: note: cast the expression to void to silence this warning

	if (true)			if (true)
	std::remove(nullptr, nullptr, 1);			std::remove(nullptr, nullptr, 1);
	// CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:5: note: cast the expression to void to silence this warning
	else if (true)			else if (true)
	std::remove(nullptr, nullptr, 1);			std::remove(nullptr, nullptr, 1);
	// CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:5: note: cast the expression to void to silence this warning
	else			else
	std::remove(nullptr, nullptr, 1);			std::remove(nullptr, nullptr, 1);
	// CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:5: note: cast the expression to void to silence this warning

	while (true)			while (true)
	std::remove(nullptr, nullptr, 1);			std::remove(nullptr, nullptr, 1);
	// CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:5: note: cast the expression to void to silence this warning

	do			do
	std::remove(nullptr, nullptr, 1);			std::remove(nullptr, nullptr, 1);
	// CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:5: note: cast the expression to void to silence this warning
	while (true);			while (true);

	for (;;)			for (;;)
	std::remove(nullptr, nullptr, 1);			std::remove(nullptr, nullptr, 1);
	// CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:5: note: cast the expression to void to silence this warning

	for (std::remove(nullptr, nullptr, 1);;)			for (std::remove(nullptr, nullptr, 1);;)
	// CHECK-MESSAGES: [[@LINE-1]]:8: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:8: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:8: note: cast the expression to void to silence this warning
	;			;

	for (;; std::remove(nullptr, nullptr, 1))			for (;; std::remove(nullptr, nullptr, 1))
	// CHECK-MESSAGES: [[@LINE-1]]:11: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:11: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:11: note: cast the expression to void to silence this warning
	;			;

	for (auto C : "foo")			for (auto C : "foo")
	std::remove(nullptr, nullptr, 1);			std::remove(nullptr, nullptr, 1);
	// CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:5: note: cast the expression to void to silence this warning

	switch (1) {			switch (1) {
	case 1:			case 1:
	std::remove(nullptr, nullptr, 1);			std::remove(nullptr, nullptr, 1);
	// CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:5: note: cast the expression to void to silence this warning
	break;			break;
	default:			default:
	std::remove(nullptr, nullptr, 1);			std::remove(nullptr, nullptr, 1);
	// CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:5: note: cast the expression to void to silence this warning
	break;			break;
	}			}

	try {			try {
	std::remove(nullptr, nullptr, 1);			std::remove(nullptr, nullptr, 1);
	// CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:5: note: cast the expression to void to silence this warning
	} catch (...) {			} catch (...) {
	std::remove(nullptr, nullptr, 1);			std::remove(nullptr, nullptr, 1);
	// CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]			// CHECK-NOTES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
				// CHECK-NOTES: [[@LINE-2]]:5: note: cast the expression to void to silence this warning
	}			}
	}			}

	void noWarning() {			void noWarning() {
	auto AsyncRetval1 = std::async(increment, 42);			auto AsyncRetval1 = std::async(increment, 42);
	auto AsyncRetval2 = std::async(std::launch::async, increment, 42);			auto AsyncRetval2 = std::async(std::launch::async, increment, 42);

	Foo FNoWarning;			Foo FNoWarning;
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