int main() {
/* Insert some nodes */
sym_table_insert("START", 100);
sym_table_insert("END", 300);
sym_table_insert("MIDDLE", 200);
/* Retrieve the nodes */
fprintf(stdout, "START is at %d\n", sym_table_lookup("START"));
fprintf(stdout, "MIDDLE is at %d\n", sym_table_lookup("MIDDLE"));
fprintf(stdout, "END is at %d\n", sym_table_lookup("END"));
/* This should generate an error */
sym_table_insert("START", 100);
return(0);
}
// When defining an identifier, define
// a new symbol and insert it into the
// symbol table on top of stack.
// Create the symbol table if it is null.
// Not all blocks have symbols. Do not create
// a symbol table for a given block until it
// has at least one symbol defined in it.
void symbol_stack::define_ident(astree* node) {
if (stack.back() == nullptr) {
stack.back() = new symbol_table;
}
// Insert new symbol in table
// on top of symbol stack.
sym_table_insert(stack.back(), node);
}
