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/*------------------------------------------------------------------------- * * memnodes.h * POSTGRES memory context node definitions. * * * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/nodes/memnodes.h * *------------------------------------------------------------------------- */ #ifndef MEMNODES_H #define MEMNODES_H #include "nodes/nodes.h" /* * MemoryContext * A logical context in which memory allocations occur. * * MemoryContext itself is an abstract type that can have multiple * implementations, though for now we have only AllocSetContext. * The function pointers in MemoryContextMethods define one specific * implementation of MemoryContext --- they are a virtual function table * in C++ terms. * * Node types that are actual implementations of memory contexts must * begin with the same fields as MemoryContext. * * Note: for largely historical reasons, typedef MemoryContext is a pointer * to the context struct rather than the struct type itself. */ typedef struct MemoryContextMethods { void *(*alloc) (MemoryContext context, Size size); /* call this free_p in case someone #define's free() */ void (*free_p) (MemoryContext context, void *pointer); void *(*realloc) (MemoryContext context, void *pointer, Size size); void (*init) (MemoryContext context); void (*reset) (MemoryContext context); void (*delete_context) (MemoryContext context); Size (*get_chunk_space) (MemoryContext context, void *pointer); bool (*is_empty) (MemoryContext context); void (*stats) (MemoryContext context, int level); #ifdef MEMORY_CONTEXT_CHECKING void (*check) (MemoryContext context); #endif } MemoryContextMethods; typedef struct MemoryContextData { NodeTag type; /* identifies exact kind of context */ MemoryContextMethods *methods; /* virtual function table */ MemoryContext parent; /* NULL if no parent (toplevel context) */ MemoryContext firstchild; /* head of linked list of children */ MemoryContext nextchild; /* next child of same parent */ char *name; /* context name (just for debugging) */ bool isReset; /* T = no space alloced since last reset */ } MemoryContextData; /* utils/palloc.h contains typedef struct MemoryContextData *MemoryContext */ /* * MemoryContextIsValid * True iff memory context is valid. * * Add new context types to the set accepted by this macro. */ #define MemoryContextIsValid(context) \ ((context) != NULL && \ (IsA((context), AllocSetContext))) #endif /* MEMNODES_H */