void QGetEnv::VisitStmt(clang::Stmt *stmt)
{
// Lets check only in function calls. Otherwise there are too many false positives, it's common
// to implicit cast to bool when checking pointers for validity, like if (ptr)
CXXMemberCallExpr *memberCall = dyn_cast<CXXMemberCallExpr>(stmt);
if (!memberCall)
return;
CXXMethodDecl *method = memberCall->getMethodDecl();
if (!method)
return;
CXXRecordDecl *record = method->getParent();
if (!record || record->getNameAsString() != "QByteArray") {
return;
}
std::vector<CallExpr *> calls = Utils::callListForChain(memberCall);
if (calls.size() != 2)
return;
CallExpr *qgetEnvCall = calls.back();
FunctionDecl *func = qgetEnvCall->getDirectCallee();
if (!func || func->getNameAsString() != "qgetenv")
return;
string methodname = method->getNameAsString();
string errorMsg;
std::string replacement;
if (methodname == "isEmpty") {
errorMsg = "qgetenv().isEmpty() allocates.";
replacement = "qEnvironmentVariableIsEmpty";
} else if (methodname == "isNull") {
errorMsg = "qgetenv().isNull() allocates.";
replacement = "qEnvironmentVariableIsSet";
} else if (methodname == "toInt") {
errorMsg = "qgetenv().toInt() is slow.";
replacement = "qEnvironmentVariableIntValue";
}
if (!errorMsg.empty()) {
std::vector<FixItHint> fixits;
if (isFixitEnabled(FixitAll)) {
const bool success = FixItUtils::transformTwoCallsIntoOne(m_ci, qgetEnvCall, memberCall, replacement, fixits);
if (!success) {
queueManualFixitWarning(memberCall->getLocStart(), FixitAll);
}
}
errorMsg += " Use " + replacement + "() instead";
emitWarning(memberCall->getLocStart(), errorMsg.c_str(), fixits);
}
}
// Catches cases like: s.append(s2.mid(1, 1));
bool StringRefCandidates::processCase2(CallExpr *call)
{
CXXMemberCallExpr *memberCall = dyn_cast<CXXMemberCallExpr>(call);
CXXOperatorCallExpr *operatorCall = dyn_cast<CXXOperatorCallExpr>(call);
CXXMethodDecl *method = nullptr;
if (memberCall) {
method = memberCall->getMethodDecl();
} else if (operatorCall && operatorCall->getCalleeDecl()) {
Decl *decl = operatorCall->getCalleeDecl();
method = dyn_cast<CXXMethodDecl>(decl);
}
if (!isMethodReceivingQStringRef(method))
return false;
Expr *firstArgument = call->getNumArgs() > 0 ? call->getArg(0) : nullptr;
MaterializeTemporaryExpr *temp = firstArgument ? dyn_cast<MaterializeTemporaryExpr>(firstArgument) : nullptr;
if (!temp) {
Expr *secondArgument = call->getNumArgs() > 1 ? call->getArg(1) : nullptr;
temp = secondArgument ? dyn_cast<MaterializeTemporaryExpr>(secondArgument) : nullptr;
if (!temp) // For the CXXOperatorCallExpr it's in the second argument
return false;
}
CallExpr *innerCall = HierarchyUtils::getFirstChildOfType2<CallExpr>(temp);
CXXMemberCallExpr *innerMemberCall = innerCall ? dyn_cast<CXXMemberCallExpr>(innerCall) : nullptr;
if (!innerMemberCall)
return false;
CXXMethodDecl *innerMethod = innerMemberCall->getMethodDecl();
if (!isInterestingFirstMethod(innerMethod))
return false;
std::vector<FixItHint> fixits;
if (isFixitEnabled(FixitUseQStringRef)) {
fixits = fixit(innerMemberCall);
}
emitWarning(call->getLocStart(), "Use " + innerMethod->getNameAsString() + "Ref() instead", fixits);
return true;
}
// Catch existing reserves
bool ReserveCandidates::registerReserveStatement(Stmt *stm)
{
auto memberCall = dyn_cast<CXXMemberCallExpr>(stm);
if (!memberCall)
return false;
CXXMethodDecl *methodDecl = memberCall->getMethodDecl();
if (!methodDecl || methodDecl->getNameAsString() != "reserve")
return false;
CXXRecordDecl *decl = methodDecl->getParent();
if (!QtUtils::isAReserveClass(decl))
return false;
ValueDecl *valueDecl = Utils::valueDeclForMemberCall(memberCall);
if (!valueDecl)
return false;
if (!clazy_std::contains(m_foundReserves, valueDecl))
m_foundReserves.push_back(valueDecl);
return true;
}
void RecordInfo::DetermineTracingMethods() {
if (determined_trace_methods_)
return;
determined_trace_methods_ = true;
if (Config::IsGCBase(name_))
return;
CXXMethodDecl* trace = nullptr;
CXXMethodDecl* trace_impl = nullptr;
CXXMethodDecl* trace_after_dispatch = nullptr;
bool has_adjust_and_mark = false;
bool has_is_heap_object_alive = false;
for (Decl* decl : record_->decls()) {
CXXMethodDecl* method = dyn_cast<CXXMethodDecl>(decl);
if (!method) {
if (FunctionTemplateDecl* func_template =
dyn_cast<FunctionTemplateDecl>(decl))
method = dyn_cast<CXXMethodDecl>(func_template->getTemplatedDecl());
}
if (!method)
continue;
switch (Config::GetTraceMethodType(method)) {
case Config::TRACE_METHOD:
trace = method;
break;
case Config::TRACE_AFTER_DISPATCH_METHOD:
trace_after_dispatch = method;
break;
case Config::TRACE_IMPL_METHOD:
trace_impl = method;
break;
case Config::TRACE_AFTER_DISPATCH_IMPL_METHOD:
break;
case Config::NOT_TRACE_METHOD:
if (method->getNameAsString() == kFinalizeName) {
finalize_dispatch_method_ = method;
} else if (method->getNameAsString() == kAdjustAndMarkName) {
has_adjust_and_mark = true;
} else if (method->getNameAsString() == kIsHeapObjectAliveName) {
has_is_heap_object_alive = true;
}
break;
}
}
// Record if class defines the two GCMixin methods.
has_gc_mixin_methods_ =
has_adjust_and_mark && has_is_heap_object_alive ? kTrue : kFalse;
if (trace_after_dispatch) {
trace_method_ = trace_after_dispatch;
trace_dispatch_method_ = trace_impl ? trace_impl : trace;
} else {
// TODO: Can we never have a dispatch method called trace without the same
// class defining a traceAfterDispatch method?
trace_method_ = trace;
trace_dispatch_method_ = nullptr;
}
if (trace_dispatch_method_ && finalize_dispatch_method_)
return;
// If this class does not define dispatching methods inherit them.
for (Bases::iterator it = GetBases().begin(); it != GetBases().end(); ++it) {
// TODO: Does it make sense to inherit multiple dispatch methods?
if (CXXMethodDecl* dispatch = it->second.info()->GetTraceDispatchMethod()) {
assert(!trace_dispatch_method_ && "Multiple trace dispatching methods");
trace_dispatch_method_ = dispatch;
}
if (CXXMethodDecl* dispatch =
it->second.info()->GetFinalizeDispatchMethod()) {
assert(!finalize_dispatch_method_ &&
"Multiple finalize dispatching methods");
finalize_dispatch_method_ = dispatch;
}
}
}