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Refactorized CheckAssert::assertWithSideEffects(): 

- Removed crap
- Error message on calling non-const member function in assert()
- Fixed false positive #5311 and TODO_ASSERT
This commit is contained in:
PKEuS 2014-08-06 10:15:48 +02:00
parent fd5ff1bb8b
commit 8da61ab71a
3 changed files with 73 additions and 66 deletions
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89
lib/checkassert.cpp
View File

@ -36,66 +36,50 @@ void CheckAssert::assertWithSideEffects()
if (!_settings->isEnabled("warning"))
return;
const Token *tok = findAssertPattern(_tokenizer->tokens());
const Token *endTok = tok ? tok->next()->link() : nullptr;
while (tok && endTok) {
for (const Token* tmp = tok->next(); tmp != endTok; tmp = tmp->next()) {
checkVariableAssignment(tmp, true);
if (tmp->isName() && tmp->type() == Token::eFunction) {
const Function* f = tmp->function();
if (f->argCount() == 0 && f->isConst) continue;
// functions with non-const references
else if (f->argCount() != 0) {
for (std::list<Variable>::const_iterator it = f->argumentList.begin(); it != f->argumentList.end(); ++it) {
if (it->isConst() || it->isLocal()) continue;
else if (it->isReference()) {
const Token* next = it->nameToken()->next();
bool isAssigned = checkVariableAssignment(next, false);
if (isAssigned)
sideEffectInAssertError(tmp, f->name());
for (const Token* tok = _tokenizer->list.front(); tok; tok = tok->next()) {
if (!Token::simpleMatch(tok, "assert ("))
continue;
}
}
}
// variables in function scope
const Token *endTok = tok->next()->link();
for (const Token* tmp = tok->next(); tmp != endTok; tmp = tmp->next()) {
checkVariableAssignment(tmp);
if (tmp->type() == Token::eFunction) {
const Function* f = tmp->function();
if (f->nestedIn->isClassOrStruct() && !f->isStatic && !f->isConst)
sideEffectInAssertError(tmp, f->name()); // Non-const member function called
else {
const Scope* scope = f->functionScope;
if (!scope) continue;
for (const Token *tok2 = scope->classStart; tok2 != scope->classEnd; tok2 = tok2->next()) {
if (tok2->type() != Token::eAssignmentOp && tok2->type() != Token::eIncDecOp) continue;
const Variable* var = tok2->previous()->variable();
if (!var || var->isLocal()) continue;
if (var->isArgument() &&
(var->isConst() || (!var->isReference() && !var->isPointer())))
// see ticket #4937. Assigning function arguments not passed by reference is ok.
if (tok2->type() != Token::eAssignmentOp && tok2->type() != Token::eIncDecOp)
continue;
std::vector<const Token*> returnTokens; // find all return statements
for (const Token *rt = scope->classStart; rt != scope->classEnd; rt = rt->next()) {
if (!Token::Match(rt, "return %any%")) continue;
returnTokens.push_back(rt);
}
const Variable* var = tok2->previous()->variable();
if (!var || var->isLocal() || (var->isArgument() && !var->isReference() && !var->isPointer()))
continue; // See ticket #4937. Assigning function arguments not passed by reference is ok.
if (var->isArgument() && var->isPointer() && tok2->strAt(-2) != "*")
continue; // Pointers need to be dereferenced, otherwise there is no error
bool noReturnInScope = true;
for (std::vector<const Token*>::iterator rt = returnTokens.begin(); rt != returnTokens.end(); ++rt) {
if (inSameScope(*rt, tok2)) {
for (const Token *rt = scope->classStart; rt != scope->classEnd; rt = rt->next()) {
if (rt->str() != "return") continue; // find all return statements
if (inSameScope(rt, tok2)) {
noReturnInScope = false;
break;
}
}
if (noReturnInScope) continue;
bool isAssigned = checkVariableAssignment(tok2, false);
if (isAssigned)
sideEffectInAssertError(tmp, f->name());
}
}
}
tok = findAssertPattern(endTok->next());
endTok = tok ? tok->next()->link() : nullptr;
sideEffectInAssertError(tmp, f->name());
break;
}
}
}
}
tok = endTok;
}
}
//---------------------------------------------------------------------------
@ -122,30 +106,21 @@ void CheckAssert::assignmentInAssertError(const Token *tok, const std::string& v
}
// checks if side effects happen on the variable prior to tmp
bool CheckAssert::checkVariableAssignment(const Token* assignTok, bool reportErr /*= true*/)
void CheckAssert::checkVariableAssignment(const Token* assignTok)
{
const Variable* v = assignTok->previous()->variable();
if (!v) return false;
if (!v) return;
// assignment
if (assignTok->isAssignmentOp() || assignTok->type() == Token::eIncDecOp) {
if (v->isConst()) return false;
if (v->isConst()) return;
if (reportErr) // report as variable assignment error
assignmentInAssertError(assignTok, v->name());
return true;
}
return false;
// TODO: function calls on v
}
const Token* CheckAssert::findAssertPattern(const Token* start)
{
return Token::findmatch(start, "assert ( %any%");
}
bool CheckAssert::inSameScope(const Token* returnTok, const Token* assignTok)
{
// TODO: even if a return is in the same scope, the assignment might not affect it.

4
lib/checkassert.h
View File

@ -49,11 +49,9 @@ public:
void assertWithSideEffects();
protected:
bool checkVariableAssignment(const Token* tmp, bool reportErr = true);
void checkVariableAssignment(const Token* tmp);
static bool inSameScope(const Token* returnTok, const Token* assignTok);
static const Token* findAssertPattern(const Token *start);
private:
void sideEffectInAssertError(const Token *tok, const std::string& functionName);
void assignmentInAssertError(const Token *tok, const std::string &varname);

38
test/testassert.cpp
View File

@ -25,7 +25,7 @@ extern std::ostringstream errout;
class TestAssert : public TestFixture {
public:
TestAssert() : TestFixture("TestAsserts") {}
TestAssert() : TestFixture("TestAssert") {}
private:
void check(
@ -53,6 +53,7 @@ private:
void run() {
TEST_CASE(assignmentInAssert);
TEST_CASE(functionCallInAssert);
TEST_CASE(memberFunctionCallInAssert);
TEST_CASE(safeFunctionCallInAssert);
}
@ -133,7 +134,40 @@ private:
"void foo() {\n"
" assert( !SquarePack::isRank1Or8(push2) );\n"
"}\n");
TODO_ASSERT_EQUALS("", "[test.cpp:8]: (warning) Assert statement calls a function which may have desired side effects: 'isRank1Or8'.\n", errout.str());
ASSERT_EQUALS("", errout.str());
}
void memberFunctionCallInAssert() {
check("struct SquarePack {\n"
" void Foo();\n"
"};\n"
"void foo(SquarePack s) {\n"
" assert( s.Foo(); );\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (warning) Assert statement calls a function which may have desired side effects: 'Foo'.\n", errout.str());
check("struct SquarePack {\n"
" void Foo() const;\n"
"};\n"
"void foo(SquarePack* s) {\n"
" assert( s->Foo(); );\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct SquarePack {\n"
" static void Foo();\n"
"};\n"
"void foo(SquarePack* s) {\n"
" assert( s->Foo(); );\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct SquarePack {\n"
"};\n"
"void foo(SquarePack* s) {\n"
" assert( s->Foo(); );\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assignmentInAssert() {