--filter expression parser accepts foo[bar]
According to the doc, it is only possible to access arrays elements using positive literal integer numbers. However, the parser accepts:
./lttng enable-event -u -a --filter 'allo[toi] == 2'
create_load_expression creates a
ir_load_expression_op node with type
IR_LOAD_EXPRESSION_GET_INDEX. However, the associated index value is the value of the pointer to the
toi string, interpreted as an unsigned integer by
visit_node_load_expression when generating the bytecode.
I think this user error should be caught earlier and result in an error on the client side.
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