diff options
| author | Peter Eisentraut <peter@eisentraut.org> | 2022-09-14 06:04:24 +0200 |
|---|---|---|
| committer | Peter Eisentraut <peter@eisentraut.org> | 2022-09-14 06:04:24 +0200 |
| commit | 7fe55d5e12b66c7807d8af1f45946d7d48f5d6db (patch) | |
| tree | 58607c8d36eba23af43dd23ab930da132b190651 /src/include/utils/palloc.h | |
| parent | 53332eacaff6a391f79294193d0c39bff9d14b43 (diff) | |
Expand palloc/pg_malloc API for more type safety
This adds additional variants of palloc, pg_malloc, etc. that
encapsulate common usage patterns and provide more type safety.
Specifically, this adds palloc_object(), palloc_array(), and
repalloc_array(), which take the type name of the object to be
allocated as its first argument and cast the return as a pointer to
that type. There are also palloc0_object() and palloc0_array()
variants for initializing with zero, and pg_malloc_*() variants of all
of the above.
Inspired by the talloc library.
This is backpatched from master so that future backpatchable code can
make use of these APIs. This patch by itself does not contain any
users of these APIs.
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/bb755632-2a43-d523-36f8-a1e7a389a907@enterprisedb.com
Diffstat (limited to 'src/include/utils/palloc.h')
| -rw-r--r-- | src/include/utils/palloc.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/include/utils/palloc.h b/src/include/utils/palloc.h index 332575f518a..a0b62aa7b0c 100644 --- a/src/include/utils/palloc.h +++ b/src/include/utils/palloc.h @@ -81,6 +81,28 @@ extern pg_nodiscard void *repalloc(void *pointer, Size size); extern void pfree(void *pointer); /* + * Variants with easier notation and more type safety + */ + +/* + * Allocate space for one object of type "type" + */ +#define palloc_object(type) ((type *) palloc(sizeof(type))) +#define palloc0_object(type) ((type *) palloc0(sizeof(type))) + +/* + * Allocate space for "count" objects of type "type" + */ +#define palloc_array(type, count) ((type *) palloc(sizeof(type) * (count))) +#define palloc0_array(type, count) ((type *) palloc0(sizeof(type) * (count))) + +/* + * Change size of allocation pointed to by "pointer" to have space for "count" + * objects of type "type" + */ +#define repalloc_array(pointer, type, count) ((type *) repalloc(pointer, sizeof(type) * (count))) + +/* * The result of palloc() is always word-aligned, so we can skip testing * alignment of the pointer when deciding which MemSet variant to use. * Note that this variant does not offer any advantage, and should not be |