Refactorized CheckAssert::assertWithSideEffects():
- Removed crap - Error message on calling non-const member function in assert() - Fixed false positive #5311 and TODO_ASSERT
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@ -36,66 +36,50 @@ void CheckAssert::assertWithSideEffects()
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if (!_settings->isEnabled("warning"))
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return;
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const Token *tok = findAssertPattern(_tokenizer->tokens());
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const Token *endTok = tok ? tok->next()->link() : nullptr;
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for (const Token* tok = _tokenizer->list.front(); tok; tok = tok->next()) {
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if (!Token::simpleMatch(tok, "assert ("))
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continue;
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while (tok && endTok) {
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const Token *endTok = tok->next()->link();
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for (const Token* tmp = tok->next(); tmp != endTok; tmp = tmp->next()) {
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checkVariableAssignment(tmp, true);
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checkVariableAssignment(tmp);
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if (tmp->isName() && tmp->type() == Token::eFunction) {
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if (tmp->type() == Token::eFunction) {
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const Function* f = tmp->function();
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if (f->argCount() == 0 && f->isConst) continue;
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// functions with non-const references
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else if (f->argCount() != 0) {
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for (std::list<Variable>::const_iterator it = f->argumentList.begin(); it != f->argumentList.end(); ++it) {
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if (it->isConst() || it->isLocal()) continue;
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else if (it->isReference()) {
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const Token* next = it->nameToken()->next();
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bool isAssigned = checkVariableAssignment(next, false);
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if (isAssigned)
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sideEffectInAssertError(tmp, f->name());
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if (f->nestedIn->isClassOrStruct() && !f->isStatic && !f->isConst)
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sideEffectInAssertError(tmp, f->name()); // Non-const member function called
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else {
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const Scope* scope = f->functionScope;
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if (!scope) continue;
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for (const Token *tok2 = scope->classStart; tok2 != scope->classEnd; tok2 = tok2->next()) {
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if (tok2->type() != Token::eAssignmentOp && tok2->type() != Token::eIncDecOp)
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continue;
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const Variable* var = tok2->previous()->variable();
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if (!var || var->isLocal() || (var->isArgument() && !var->isReference() && !var->isPointer()))
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continue; // See ticket #4937. Assigning function arguments not passed by reference is ok.
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if (var->isArgument() && var->isPointer() && tok2->strAt(-2) != "*")
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continue; // Pointers need to be dereferenced, otherwise there is no error
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bool noReturnInScope = true;
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for (const Token *rt = scope->classStart; rt != scope->classEnd; rt = rt->next()) {
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if (rt->str() != "return") continue; // find all return statements
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if (inSameScope(rt, tok2)) {
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noReturnInScope = false;
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break;
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}
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}
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}
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}
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if (noReturnInScope) continue;
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// variables in function scope
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const Scope* scope = f->functionScope;
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if (!scope) continue;
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for (const Token *tok2 = scope->classStart; tok2 != scope->classEnd; tok2 = tok2->next()) {
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if (tok2->type() != Token::eAssignmentOp && tok2->type() != Token::eIncDecOp) continue;
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const Variable* var = tok2->previous()->variable();
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if (!var || var->isLocal()) continue;
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if (var->isArgument() &&
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(var->isConst() || (!var->isReference() && !var->isPointer())))
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// see ticket #4937. Assigning function arguments not passed by reference is ok.
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continue;
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std::vector<const Token*> returnTokens; // find all return statements
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for (const Token *rt = scope->classStart; rt != scope->classEnd; rt = rt->next()) {
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if (!Token::Match(rt, "return %any%")) continue;
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returnTokens.push_back(rt);
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}
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bool noReturnInScope = true;
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for (std::vector<const Token*>::iterator rt = returnTokens.begin(); rt != returnTokens.end(); ++rt) {
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if (inSameScope(*rt, tok2)) {
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noReturnInScope = false;
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break;
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}
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}
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if (noReturnInScope) continue;
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bool isAssigned = checkVariableAssignment(tok2, false);
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if (isAssigned)
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sideEffectInAssertError(tmp, f->name());
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break;
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}
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}
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}
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}
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tok = findAssertPattern(endTok->next());
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endTok = tok ? tok->next()->link() : nullptr;
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tok = endTok;
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}
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}
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//---------------------------------------------------------------------------
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@ -122,30 +106,21 @@ void CheckAssert::assignmentInAssertError(const Token *tok, const std::string& v
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}
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// checks if side effects happen on the variable prior to tmp
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bool CheckAssert::checkVariableAssignment(const Token* assignTok, bool reportErr /*= true*/)
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void CheckAssert::checkVariableAssignment(const Token* assignTok)
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{
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const Variable* v = assignTok->previous()->variable();
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if (!v) return false;
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if (!v) return;
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// assignment
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if (assignTok->isAssignmentOp() || assignTok->type() == Token::eIncDecOp) {
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if (v->isConst()) return false;
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if (v->isConst()) return;
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if (reportErr) // report as variable assignment error
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assignmentInAssertError(assignTok, v->name());
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return true;
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assignmentInAssertError(assignTok, v->name());
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}
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return false;
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// TODO: function calls on v
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}
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const Token* CheckAssert::findAssertPattern(const Token* start)
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{
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return Token::findmatch(start, "assert ( %any%");
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}
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bool CheckAssert::inSameScope(const Token* returnTok, const Token* assignTok)
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{
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// TODO: even if a return is in the same scope, the assignment might not affect it.
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@ -49,11 +49,9 @@ public:
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void assertWithSideEffects();
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protected:
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bool checkVariableAssignment(const Token* tmp, bool reportErr = true);
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void checkVariableAssignment(const Token* tmp);
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static bool inSameScope(const Token* returnTok, const Token* assignTok);
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static const Token* findAssertPattern(const Token *start);
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private:
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void sideEffectInAssertError(const Token *tok, const std::string& functionName);
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void assignmentInAssertError(const Token *tok, const std::string &varname);
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@ -25,7 +25,7 @@ extern std::ostringstream errout;
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class TestAssert : public TestFixture {
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public:
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TestAssert() : TestFixture("TestAsserts") {}
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TestAssert() : TestFixture("TestAssert") {}
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private:
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void check(
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@ -53,6 +53,7 @@ private:
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void run() {
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TEST_CASE(assignmentInAssert);
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TEST_CASE(functionCallInAssert);
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TEST_CASE(memberFunctionCallInAssert);
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TEST_CASE(safeFunctionCallInAssert);
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}
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@ -133,7 +134,40 @@ private:
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"void foo() {\n"
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" assert( !SquarePack::isRank1Or8(push2) );\n"
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"}\n");
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TODO_ASSERT_EQUALS("", "[test.cpp:8]: (warning) Assert statement calls a function which may have desired side effects: 'isRank1Or8'.\n", errout.str());
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ASSERT_EQUALS("", errout.str());
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}
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void memberFunctionCallInAssert() {
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check("struct SquarePack {\n"
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" void Foo();\n"
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"};\n"
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"void foo(SquarePack s) {\n"
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" assert( s.Foo(); );\n"
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"}");
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ASSERT_EQUALS("[test.cpp:5]: (warning) Assert statement calls a function which may have desired side effects: 'Foo'.\n", errout.str());
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check("struct SquarePack {\n"
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" void Foo() const;\n"
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"};\n"
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"void foo(SquarePack* s) {\n"
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" assert( s->Foo(); );\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("struct SquarePack {\n"
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" static void Foo();\n"
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"};\n"
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"void foo(SquarePack* s) {\n"
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" assert( s->Foo(); );\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("struct SquarePack {\n"
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"};\n"
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"void foo(SquarePack* s) {\n"
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" assert( s->Foo(); );\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void assignmentInAssert() {
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