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/*------------------------------------------------------------------------- * * spi_priv.h * Server Programming Interface private declarations * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/executor/spi_priv.h * *------------------------------------------------------------------------- */ #ifndef SPI_PRIV_H #define SPI_PRIV_H #include "executor/spi.h" #define _SPI_PLAN_MAGIC 569278163 typedef struct { /* current results */ uint64 processed; /* by Executor */ Oid lastoid; SPITupleTable *tuptable; /* tuptable currently being built */ /* resources of this execution context */ slist_head tuptables; /* list of all live SPITupleTables */ MemoryContext procCxt; /* procedure context */ MemoryContext execCxt; /* executor context */ MemoryContext savedcxt; /* context of SPI_connect's caller */ SubTransactionId connectSubid; /* ID of connecting subtransaction */ /* subtransaction in which current Executor call was started */ SubTransactionId execSubid; /* saved values of API global variables for previous nesting level */ uint64 outer_processed; Oid outer_lastoid; SPITupleTable *outer_tuptable; int outer_result; } _SPI_connection; /* * SPI plans have three states: saved, unsaved, or temporary. * * Ordinarily, the _SPI_plan struct itself as well as the argtypes array * are in a dedicated memory context identified by plancxt (which can be * really small). All the other subsidiary state is in plancache entries * identified by plancache_list (note: the list cells themselves are in * plancxt). * * In an unsaved plan, the plancxt as well as the plancache entries' contexts * are children of the SPI procedure context, so they'll all disappear at * function exit. plancache.c also knows that the plancache entries are * "unsaved", so it doesn't link them into its global list; hence they do * not respond to inval events. This is OK since we are presumably holding * adequate locks to prevent other backends from messing with the tables. * * For a saved plan, the plancxt is made a child of CacheMemoryContext * since it should persist until explicitly destroyed. Likewise, the * plancache entries will be under CacheMemoryContext since we tell * plancache.c to save them. We rely on plancache.c to keep the cache * entries up-to-date as needed in the face of invalidation events. * * There are also "temporary" SPI plans, in which the _SPI_plan struct is * not even palloc'd but just exists in some function's local variable. * The plancache entries are unsaved and exist under the SPI executor context, * while additional data such as argtypes and list cells is loose in the SPI * executor context. Such plans can be identified by having plancxt == NULL. * * We can also have "one-shot" SPI plans (which are typically temporary, * as described above). These are meant to be executed once and discarded, * and various optimizations are made on the assumption of single use. * Note in particular that the CachedPlanSources within such an SPI plan * are not "complete" until execution. * * Note: if the original query string contained only whitespace and comments, * the plancache_list will be NIL and so there is no place to store the * query string. We don't care about that, but we do care about the * argument type array, which is why it's seemingly-redundantly stored. */ typedef struct _SPI_plan { int magic; /* should equal _SPI_PLAN_MAGIC */ bool saved; /* saved or unsaved plan? */ bool oneshot; /* one-shot plan? */ List *plancache_list; /* one CachedPlanSource per parsetree */ MemoryContext plancxt; /* Context containing _SPI_plan and data */ int cursor_options; /* Cursor options used for planning */ int nargs; /* number of plan arguments */ Oid *argtypes; /* Argument types (NULL if nargs is 0) */ ParserSetupHook parserSetup; /* alternative parameter spec method */ void *parserSetupArg; } _SPI_plan; #endif /* SPI_PRIV_H */