diff options
Diffstat (limited to 'src/include/nodes/nodeFuncs.h')
| -rw-r--r-- | src/include/nodes/nodeFuncs.h | 114 |
1 files changed, 87 insertions, 27 deletions
diff --git a/src/include/nodes/nodeFuncs.h b/src/include/nodes/nodeFuncs.h index 93c60bde667..e223b053e62 100644 --- a/src/include/nodes/nodeFuncs.h +++ b/src/include/nodes/nodeFuncs.h @@ -15,6 +15,8 @@ #include "nodes/parsenodes.h" +struct PlanState; /* avoid including execnodes.h too */ + /* flags bits for query_tree_walker and query_tree_mutator */ #define QTW_IGNORE_RT_SUBQUERIES 0x01 /* subqueries in rtable */ @@ -32,6 +34,14 @@ /* callback function for check_functions_in_node */ typedef bool (*check_function_callback) (Oid func_id, void *context); +/* callback functions for tree walkers */ +typedef bool (*tree_walker_callback) (Node *node, void *context); +typedef bool (*planstate_tree_walker_callback) (struct PlanState *planstate, + void *context); + +/* callback functions for tree mutators */ +typedef Node *(*tree_mutator_callback) (Node *node, void *context); + extern Oid exprType(const Node *expr); extern int32 exprTypmod(const Node *expr); @@ -129,34 +139,84 @@ get_notclausearg(const void *notclause) extern bool check_functions_in_node(Node *node, check_function_callback checker, void *context); -extern bool expression_tree_walker(Node *node, bool (*walker) (), - void *context); -extern Node *expression_tree_mutator(Node *node, Node *(*mutator) (), - void *context); - -extern bool query_tree_walker(Query *query, bool (*walker) (), - void *context, int flags); -extern Query *query_tree_mutator(Query *query, Node *(*mutator) (), - void *context, int flags); - -extern bool range_table_walker(List *rtable, bool (*walker) (), - void *context, int flags); -extern List *range_table_mutator(List *rtable, Node *(*mutator) (), - void *context, int flags); - -extern bool range_table_entry_walker(RangeTblEntry *rte, bool (*walker) (), - void *context, int flags); - -extern bool query_or_expression_tree_walker(Node *node, bool (*walker) (), - void *context, int flags); -extern Node *query_or_expression_tree_mutator(Node *node, Node *(*mutator) (), - void *context, int flags); +/* + * The following functions are usually passed walker or mutator callbacks + * that are declared like "bool walker(Node *node, my_struct *context)" + * rather than "bool walker(Node *node, void *context)" as a strict reading + * of the C standard would require. Changing the callbacks' declarations + * to "void *" would create serious hazards of passing them the wrong context + * struct type, so we respectfully decline to support the standard's position + * that a pointer to struct is incompatible with "void *". Instead, silence + * related compiler warnings by inserting casts into these macro wrappers. + */ -extern bool raw_expression_tree_walker(Node *node, bool (*walker) (), +#define expression_tree_walker(n, w, c) \ + expression_tree_walker_impl(n, (tree_walker_callback) (w), c) +#define expression_tree_mutator(n, m, c) \ + expression_tree_mutator_impl(n, (tree_mutator_callback) (m), c) + +#define query_tree_walker(q, w, c, f) \ + query_tree_walker_impl(q, (tree_walker_callback) (w), c, f) +#define query_tree_mutator(q, m, c, f) \ + query_tree_mutator_impl(q, (tree_mutator_callback) (m), c, f) + +#define range_table_walker(rt, w, c, f) \ + range_table_walker_impl(rt, (tree_walker_callback) (w), c, f) +#define range_table_mutator(rt, m, c, f) \ + range_table_mutator_impl(rt, (tree_mutator_callback) (m), c, f) + +#define range_table_entry_walker(r, w, c, f) \ + range_table_entry_walker_impl(r, (tree_walker_callback) (w), c, f) + +#define query_or_expression_tree_walker(n, w, c, f) \ + query_or_expression_tree_walker_impl(n, (tree_walker_callback) (w), c, f) +#define query_or_expression_tree_mutator(n, m, c, f) \ + query_or_expression_tree_mutator_impl(n, (tree_mutator_callback) (m), c, f) + +#define raw_expression_tree_walker(n, w, c) \ + raw_expression_tree_walker_impl(n, (tree_walker_callback) (w), c) + +#define planstate_tree_walker(ps, w, c) \ + planstate_tree_walker_impl(ps, (planstate_tree_walker_callback) (w), c) + +extern bool expression_tree_walker_impl(Node *node, + tree_walker_callback walker, + void *context); +extern Node *expression_tree_mutator_impl(Node *node, + tree_mutator_callback mutator, + void *context); + +extern bool query_tree_walker_impl(Query *query, + tree_walker_callback walker, + void *context, int flags); +extern Query *query_tree_mutator_impl(Query *query, + tree_mutator_callback mutator, + void *context, int flags); + +extern bool range_table_walker_impl(List *rtable, + tree_walker_callback walker, + void *context, int flags); +extern List *range_table_mutator_impl(List *rtable, + tree_mutator_callback mutator, + void *context, int flags); + +extern bool range_table_entry_walker_impl(RangeTblEntry *rte, + tree_walker_callback walker, + void *context, int flags); + +extern bool query_or_expression_tree_walker_impl(Node *node, + tree_walker_callback walker, + void *context, int flags); +extern Node *query_or_expression_tree_mutator_impl(Node *node, + tree_mutator_callback mutator, + void *context, int flags); + +extern bool raw_expression_tree_walker_impl(Node *node, + tree_walker_callback walker, + void *context); + +extern bool planstate_tree_walker_impl(struct PlanState *planstate, + planstate_tree_walker_callback walker, void *context); -struct PlanState; -extern bool planstate_tree_walker(struct PlanState *planstate, bool (*walker) (), - void *context); - #endif /* NODEFUNCS_H */ |