diff options
Diffstat (limited to 'src/include/nodes/nodes.h')
| -rw-r--r-- | src/include/nodes/nodes.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/include/nodes/nodes.h b/src/include/nodes/nodes.h index 5dcc66f27ff..7adb2e1a20f 100644 --- a/src/include/nodes/nodes.h +++ b/src/include/nodes/nodes.h @@ -493,6 +493,28 @@ extern PGDLLIMPORT Node *newNodeMacroHolder; #define IsA(nodeptr,_type_) (nodeTag(nodeptr) == T_##_type_) +/* + * castNode(type, ptr) casts ptr to type and, if cassert is enabled, verifies + * that the the c actually has the appropriate type (using it's nodeTag()). + * + * Use an inline function when assertions are enabled, to avoid multiple + * evaluations of the ptr argument (which could e.g. be a function call). If + * inline functions are not available - only a small number of platforms - + * don't Assert, but use the non-checking version. + */ +#if defined(USE_ASSERT_CHECKING) && defined(PG_USE_INLINE) +static inline Node* +castNodeImpl(enum NodeTag type, void *ptr) +{ + Assert(ptr == NULL || nodeTag(ptr) == type); + return ptr; +} +#define castNode(_type_, nodeptr) ((_type_ *) castNodeImpl(T_##_type_, nodeptr)) +#else +#define castNode(_type_,nodeptr) ((_type_ *)(nodeptr)) +#endif + + /* ---------------------------------------------------------------- * extern declarations follow * ---------------------------------------------------------------- |