void DeleteNullPointerCheck::registerMatchers(MatchFinder *Finder) {
const auto DeleteExpr =
cxxDeleteExpr(has(castExpr(has(declRefExpr(
to(decl(equalsBoundNode("deletedPointer"))))))))
.bind("deleteExpr");
const auto DeleteMemberExpr =
cxxDeleteExpr(has(castExpr(has(memberExpr(hasDeclaration(
fieldDecl(equalsBoundNode("deletedMemberPointer"))))))))
.bind("deleteMemberExpr");
const auto PointerExpr = ignoringImpCasts(anyOf(
declRefExpr(to(decl().bind("deletedPointer"))),
memberExpr(hasDeclaration(fieldDecl().bind("deletedMemberPointer")))));
const auto PointerCondition = castExpr(hasCastKind(CK_PointerToBoolean),
hasSourceExpression(PointerExpr));
const auto BinaryPointerCheckCondition =
binaryOperator(hasEitherOperand(castExpr(hasCastKind(CK_NullToPointer))),
hasEitherOperand(PointerExpr));
Finder->addMatcher(
ifStmt(hasCondition(anyOf(PointerCondition, BinaryPointerCheckCondition)),
hasThen(anyOf(
DeleteExpr, DeleteMemberExpr,
compoundStmt(anyOf(has(DeleteExpr), has(DeleteMemberExpr)),
statementCountIs(1))
.bind("compound"))))
.bind("ifWithDelete"),
this);
}
// primaryExpr ::= NUMBER
// | STRING
// | variable
// | function '(' exprList ')'
// | '(' expr ')'
std::unique_ptr<Expr> FlowParser::primaryExpr()
{
FNTRACE();
static struct {
const char* ident;
long long nominator;
long long denominator;
} units[] = {
{ "byte", 1, 1 },
{ "kbyte", 1024llu, 1 },
{ "mbyte", 1024llu * 1024, 1 },
{ "gbyte", 1024llu * 1024 * 1024, 1 },
{ "tbyte", 1024llu * 1024 * 1024 * 1024, 1 },
{ "bit", 1, 8 },
{ "kbit", 1024llu, 8 },
{ "mbit", 1024llu * 1024, 8 },
{ "gbit", 1024llu * 1024 * 1024, 8 },
{ "tbit", 1024llu * 1024 * 1024 * 1024, 8 },
{ "sec", 1, 1 },
{ "min", 60llu, 1 },
{ "hour", 60llu * 60, 1 },
{ "day", 60llu * 60 * 24, 1 },
{ "week", 60llu * 60 * 24 * 7, 1 },
{ "month", 60llu * 60 * 24 * 30, 1 },
{ "year", 60llu * 60 * 24 * 365, 1 },
{ nullptr, 1, 1 }
};
FlowLocation loc(location());
switch (token()) {
case FlowToken::Ident: {
std::string name = stringValue();
nextToken();
Symbol* symbol = scope()->lookup(name, Lookup::All);
if (!symbol) {
// XXX assume that given symbol is a auto forward-declared handler.
Handler* href = (Handler*) globalScope()->appendSymbol(std::make_unique<Handler>(name, loc));
return std::make_unique<HandlerRefExpr>(href, loc);
}
if (auto variable = dynamic_cast<Variable*>(symbol))
return std::make_unique<VariableExpr>(variable, loc);
if (auto handler = dynamic_cast<Handler*>(symbol))
return std::make_unique<HandlerRefExpr>(handler, loc);
if (symbol->type() == Symbol::BuiltinFunction) {
if (token() != FlowToken::RndOpen)
return std::make_unique<FunctionCallExpr>((BuiltinFunction*) symbol, ExprList()/*args*/, loc);
nextToken();
ExprList args;
bool rv = listExpr(args);
consume(FlowToken::RndClose);
if (!rv) return nullptr;
return std::make_unique<FunctionCallExpr>((BuiltinFunction*) symbol, std::move(args), loc);
}
reportError("Unsupported symbol type of '%s' in expression.", name.c_str());
return nullptr;
}
case FlowToken::Boolean: {
std::unique_ptr<BoolExpr> e = std::make_unique<BoolExpr>(booleanValue(), loc);
nextToken();
return std::move(e);
}
case FlowToken::RegExp: {
std::unique_ptr<RegExpExpr> e = std::make_unique<RegExpExpr>(RegExp(stringValue()), loc);
nextToken();
return std::move(e);
}
case FlowToken::InterpolatedStringFragment:
return interpolatedStr();
case FlowToken::String:
case FlowToken::RawString: {
std::unique_ptr<StringExpr> e = std::make_unique<StringExpr>(stringValue(), loc);
nextToken();
return std::move(e);
}
case FlowToken::Number: { // NUMBER [UNIT]
auto number = numberValue();
nextToken();
if (token() == FlowToken::Ident) {
std::string sv(stringValue());
for (size_t i = 0; units[i].ident; ++i) {
if (sv == units[i].ident
|| (sv[sv.size() - 1] == 's' && sv.substr(0, sv.size() - 1) == units[i].ident))
{
nextToken(); // UNIT
number = number * units[i].nominator / units[i].denominator;
loc.update(end());
break;
}
}
}
return std::make_unique<NumberExpr>(number, loc);
}
case FlowToken::IP: {
std::unique_ptr<IPAddressExpr> e = std::make_unique<IPAddressExpr>(lexer_->ipValue(), loc);
nextToken();
return std::move(e);
}
case FlowToken::Cidr: {
std::unique_ptr<CidrExpr> e = std::make_unique<CidrExpr>(lexer_->cidr(), loc);
nextToken();
return std::move(e);
}
case FlowToken::StringType:
case FlowToken::NumberType:
case FlowToken::BoolType:
return castExpr();
case FlowToken::Begin: { // lambda-like inline function ref
char name[64];
static unsigned long i = 0;
++i;
snprintf(name, sizeof(name), "__lambda_%lu", i);
FlowLocation loc = location();
auto st = std::make_unique<SymbolTable>(scope(), name);
enter(st.get());
std::unique_ptr<Stmt> body = compoundStmt();
leave();
if (!body)
return nullptr;
loc.update(body->location().end);
Handler* handler = new Handler(name, std::move(st), std::move(body), loc);
// TODO (memory leak): add handler to unit's global scope, i.e. via:
// - scope()->rootScope()->insert(handler);
// - unit_->scope()->insert(handler);
// to get free'd
return std::make_unique<HandlerRefExpr>(handler, loc);
}
case FlowToken::RndOpen: {
nextToken();
std::unique_ptr<Expr> e = expr();
consume(FlowToken::RndClose);
e->setLocation(loc.update(end()));
return e;
}
default:
TRACE(1, "Expected primary expression. Got something... else.");
reportUnexpectedToken();
return nullptr;
}
}
