src/include/fe_utils/conditional.h:66-69
ConditionalStackData is a struct that serves as the main container for managing a stack of conditional states in PostgreSQL frontend utilities.
typedef struct ConditionalStackData
{
IfStackElem *head;
} ConditionalStackData;ConditionalStackData acts as the primary data structure for managing nested conditional blocks (\if...\endif) in PostgreSQL command-line tools like psql and pgbench. It maintains a simple linked list stack where each node represents a level of conditional nesting. The structure provides a clean interface for conditional stack operations while encapsulating the underlying IfStackElem linked list implementation.
*head: Pointer to the top IfStackElem in the conditional stack, representing the most recently entered (innermost) conditional block; NULL when no conditionals are active
- Functions called/Symbols referenced:
- IfStackElem (struct representing individual stack elements)
- Called from (representative examples):
- conditional_stack_create
- ConditionalStack (type alias)
This structure serves as the foundation for conditional processing in PostgreSQL frontend tools. It provides a clean abstraction over the underlying linked list implementation, allowing for easy stack operations while maintaining the state information necessary for proper conditional block execution and query buffer management.