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CheckClass: Fix false negatives for uninitMemberVar

This commit is contained in:
Daniel Marjamäki 2022-06-21 19:28:08 +02:00
parent 49ffe80f75
commit 1d5166d70c
3 changed files with 88 additions and 47 deletions
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92
lib/checkclass.cpp
View File

@ -123,29 +123,6 @@ static bool isVclTypeInit(const Type *type)
}
return false;
}
// Plain old C struct?
static bool isPodStruct(const Scope *scope) {
if (scope->type != Scope::ScopeType::eStruct && scope->type != Scope::ScopeType::eUnion)
return false;
if (!scope->functionList.empty())
return false;
for (const Variable& var: scope->varlist) {
if (!var.valueType())
return false;
if (var.valueType()->isIntegral() || var.valueType()->pointer || var.valueType()->isFloat())
continue;
if (var.valueType()->typeScope && isPodStruct(var.valueType()->typeScope))
continue;
return false;
}
for (const Scope* childScope: scope->nestedList) {
if (!isPodStruct(childScope))
return false;
}
return true;
}
//---------------------------------------------------------------------------
CheckClass::CheckClass(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
@ -242,18 +219,42 @@ void CheckClass::constructors()
// Mark all variables not used
clearAllVar(usageList);
std::list<const Function *> callstack;
initializeVarList(func, callstack, scope, usageList);
// Check if any variables are uninitialized
// Variables with default initializers
for (Usage &usage : usageList) {
const Variable& var = *usage.var;
// check for C++11 initializer
if (var.hasDefault() && func.type != Function::eOperatorEqual && func.type != Function::eCopyConstructor) { // variable still needs to be copied
usage.init = true;
continue;
}
}
std::list<const Function *> callstack;
initializeVarList(func, callstack, scope, usageList);
// Assign 1 union member => assign all union members
for (const Usage &usage : usageList) {
const Variable& var = *usage.var;
if (!usage.assign && !usage.init)
continue;
const Scope* varScope1 = var.nameToken()->scope();
if (varScope1->type == Scope::ScopeType::eUnion) {
for (Usage &usage2 : usageList) {
const Variable& var2 = *usage2.var;
if (usage2.assign || usage2.init || var2.isStatic())
continue;
const Scope* varScope2 = var2.nameToken()->scope();
if (varScope2->type == Scope::ScopeType::eStruct)
varScope2 = varScope2->nestedIn;
if (varScope1 == varScope2)
usage2.assign = true;
}
}
}
// Check if any variables are uninitialized
for (const Usage &usage : usageList) {
const Variable& var = *usage.var;
if (usage.assign || usage.init || var.isStatic())
continue;
@ -320,30 +321,17 @@ void CheckClass::constructors()
const Scope *varType = var.typeScope();
if (!varType || varType->type != Scope::eUnion) {
const bool derived = scope != var.scope();
// is the derived variable declared in a plain old C struct
bool varScopeIsPodStruct = false;
if (derived && scope->definedType && scope->definedType->derivedFrom.size() > 0) {
for (const Scope* s = var.scope(); s; s = s ? s->nestedIn : nullptr) {
for (const Type::BaseInfo& baseInfo: scope->definedType->derivedFrom) {
if (s->definedType == baseInfo.type) {
varScopeIsPodStruct = isPodStruct(s);
s = nullptr;
break;
}
}
}
}
if (func.type == Function::eConstructor &&
func.nestedIn && (func.nestedIn->numConstructors - func.nestedIn->numCopyOrMoveConstructors) > 1 &&
func.argCount() == 0 && func.functionScope &&
func.arg && func.arg->link()->next() == func.functionScope->bodyStart &&
func.functionScope->bodyStart->link() == func.functionScope->bodyStart->next()) {
// don't warn about user defined default constructor when there are other constructors
if (printInconclusive && (!derived || !varScopeIsPodStruct))
if (printInconclusive)
uninitVarError(func.token, func.access == AccessControl::Private, func.type, var.scope()->className, var.name(), derived, true);
} else if (missingCopy)
missingMemberCopyError(func.token, func.type, var.scope()->className, var.name());
else if (!derived || !varScopeIsPodStruct)
else
uninitVarError(func.token, func.access == AccessControl::Private, func.type, var.scope()->className, var.name(), derived, false);
}
}
@ -678,6 +666,21 @@ void CheckClass::assignVar(std::vector<Usage> &usageList, nonneg int varid)
}
}
void CheckClass::assignVar(std::vector<Usage> &usageList, const Token* vartok)
{
if (vartok->varId() > 0) {
assignVar(usageList, vartok->varId());
return;
}
for (Usage& usage: usageList) {
// FIXME: This is a workaround when varid is not set for a derived member
if (usage.var->name() == vartok->str()) {
usage.assign = true;
return;
}
}
}
void CheckClass::initVar(std::vector<Usage> &usageList, nonneg int varid)
{
for (Usage& usage: usageList) {
@ -952,6 +955,7 @@ void CheckClass::initializeVarList(const Function &func, std::list<const Functio
tok2 = tok2->next();
if (tok2->str() == "&")
tok2 = tok2->next();
if (isVariableChangedByFunctionCall(tok2, tok2->previous()->str() == "&", tok2->varId(), mSettings, nullptr))
assignVar(usage, tok2->varId());
}
}
@ -991,7 +995,7 @@ void CheckClass::initializeVarList(const Function &func, std::list<const Functio
// Assignment of member variable?
else if (Token::Match(ftok, "%name% =")) {
assignVar(usage, ftok->varId());
assignVar(usage, ftok);
bool bailout = ftok->variable() && ftok->variable()->isReference();
const Token* tok2 = ftok->tokAt(2);
if (tok2->str() == "&") {

7
lib/checkclass.h
View File

@ -352,6 +352,13 @@ private:
*/
static void assignVar(std::vector<Usage> &usageList, nonneg int varid);
/**
* @brief assign a variable in the varlist
* @param usageList reference to usage vector
* @param vartok variable token
*/
static void assignVar(std::vector<Usage> &usageList, const Token *vartok);
/**
* @brief initialize a variable in the varlist
* @param usageList reference to usage vector

34
test/testconstructors.cpp
View File

@ -126,7 +126,7 @@ private:
TEST_CASE(initvar_delegate); // ticket #4302
TEST_CASE(initvar_delegate2);
TEST_CASE(initvar_derived_class);
TEST_CASE(initvar_derived_pod_struct); // #11101
TEST_CASE(initvar_derived_pod_struct_with_union); // #11101
TEST_CASE(initvar_private_constructor); // BUG 2354171 - private constructor
TEST_CASE(initvar_copy_constructor); // ticket #1611
@ -1417,7 +1417,7 @@ private:
}
void initvar_derived_pod_struct() {
void initvar_derived_pod_struct_with_union() {
check("struct S {\n"
" union {\n"
" unsigned short all;\n"
@ -1433,6 +1433,24 @@ private:
" C() { all = 0; tick = 0; }\n"
"};");
ASSERT_EQUALS("", errout.str());
check("struct S {\n"
" union {\n"
" unsigned short all;\n"
" struct {\n"
" unsigned char flag1;\n"
" unsigned char flag2;\n"
" };\n"
" };\n"
"};\n"
"\n"
"class C : public S {\n"
"public:\n"
" C() {}\n"
"};");
ASSERT_EQUALS("[test.cpp:13]: (warning) Member variable 'S::all' is not initialized in the constructor. Maybe it should be initialized directly in the class S?\n"
"[test.cpp:13]: (warning) Member variable 'S::flag1' is not initialized in the constructor. Maybe it should be initialized directly in the class S?\n"
"[test.cpp:13]: (warning) Member variable 'S::flag2' is not initialized in the constructor. Maybe it should be initialized directly in the class S?\n", errout.str());
}
void initvar_private_constructor() {
@ -3634,6 +3652,18 @@ private:
" void Init( Structure& S ) { S.C = 0; };\n"
"};");
ASSERT_EQUALS("", errout.str());
check("struct Structure {\n"
" int C;\n"
"};\n"
"\n"
"class A {\n"
" Structure B;\n"
"public:\n"
" A() { Init( B ); };\n"
" void Init(const Structure& S) { }\n"
"};");
ASSERT_EQUALS("[test.cpp:8]: (warning) Member variable 'A::B' is not initialized in the constructor.\n", errout.str());
}
void uninitSameClassName() {