Ejemplo n.º 1
0
void CCodeGenerator::operator()(Assignment* expr) {
    // Handle all types of assignment, including member assignment
    Expression::Ptr init = expr->initializer();
    if (dynamic_cast<Empty*>(init.pointer())) {
        return_ = Operand(env_->integer("0"));
    } else {
        return_ = emit(init);
    }

    String::Ptr id = expr->identifier();
    Variable::Ptr var = variable(id);
    Attribute::Ptr attr = class_ ? class_->attribute(id) : 0;

    if (var) {
        // Assignment to a local var that has already been initialized once in
        // the current scope.
        Type::Ptr type = var->type();
        if (!type->is_value()) {
            refcount_dec(Operand(var->name()));
        }
        line();
        out_ << id->string() << " = " << return_ << ";\n";
        if (!type->is_value()) {
            refcount_inc(Operand(var->name()));
        }
    } else if (attr) {
        // Assignment to an attribute within a class
/*
        Type::Ptr type = expr->type(); 
        Variable::Ptr self = variable(env_->name("__self"));
        Operand addr = Operand::addr(, attr->slot());  
        Operand old = load(addr);
        if (!type->is_value() && !attr->is_weak()) {
            refcount_dec(old);
        } 
        store(addr, return_);
        if (!type->is_value() && !attr->is_weak()) {
            refcount_inc(return_);
        }
*/
        assert(!"not impl");
    } else {
        // Assignment to a local var that has not yet been initialized in the
        // current scope.
        Type::Ptr declared = expr->declared_type();
        if (declared->is_top()) {
            declared = expr->type();
        }
        line();
        brace();
        operator()(declared);
        out_ << " " << id->string() << " = " << return_ << "; ";
        out_ << "(void)" << id->string()  << ";\n";
        variable(new Variable(id, declared));
        if (!declared->is_value()) {
            refcount_inc(return_);
        }
    }
}
Ejemplo n.º 2
0
void CCodeGenerator::scope_cleanup(Variable* var) {
    // Emits the code to clean up the stack when exiting a block.  This
    // includes decrementing reference counts, and calling destructors for
    // value types.
    Type::Ptr type = var->type();
    if (type && !type->is_primitive()) {
        if (type->is_value()) {
            assert(!"Need to figure out how to do value types");
            // Call destructor
        } else {
            // Emit a branch to check the variable's reference count and free
            // it if necessary.
            refcount_dec(Operand(var->name()));
        }
    }
}