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Commit1728822

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Expand palloc/pg_malloc API for more type safety
This adds additional variants of palloc, pg_malloc, etc. thatencapsulate common usage patterns and provide more type safety.Specifically, this adds palloc_object(), palloc_array(), andrepalloc_array(), which take the type name of the object to beallocated as its first argument and cast the return as a pointer tothat type. There are also palloc0_object() and palloc0_array()variants for initializing with zero, and pg_malloc_*() variants of allof the above.Inspired by the talloc library.This is backpatched from master so that future backpatchable code canmake use of these APIs. This patch by itself does not contain anyusers 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
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‎src/include/common/fe_memutils.h

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@@ -29,6 +29,28 @@ extern void *pg_malloc_extended(size_t size, int flags);
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externvoid*pg_realloc(void*pointer,size_tsize);
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externvoidpg_free(void*pointer);
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/*
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* Variants with easier notation and more type safety
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*/
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/*
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* Allocate space for one object of type "type"
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*/
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#definepg_malloc_object(type) ((type *) pg_malloc(sizeof(type)))
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#definepg_malloc0_object(type) ((type *) pg_malloc0(sizeof(type)))
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/*
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* Allocate space for "count" objects of type "type"
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*/
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#definepg_malloc_array(type,count) ((type *) pg_malloc(sizeof(type) * (count)))
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#definepg_malloc0_array(type,count) ((type *) pg_malloc0(sizeof(type) * (count)))
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/*
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* Change size of allocation pointed to by "pointer" to have space for "count"
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* objects of type "type"
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*/
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#definepg_realloc_array(pointer,type,count) ((type *) pg_realloc(pointer, sizeof(type) * (count)))
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/* Equivalent functions, deliberately named the same as backend functions */
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externchar*pstrdup(constchar*in);
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externchar*pnstrdup(constchar*in,Sizesize);
@@ -38,6 +60,12 @@ extern void *palloc_extended(Size size, int flags);
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externvoid*repalloc(void*pointer,Sizesize);
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externvoidpfree(void*pointer);
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#definepalloc_object(type) ((type *) palloc(sizeof(type)))
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#definepalloc0_object(type) ((type *) palloc0(sizeof(type)))
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#definepalloc_array(type,count) ((type *) palloc(sizeof(type) * (count)))
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#definepalloc0_array(type,count) ((type *) palloc0(sizeof(type) * (count)))
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#definerepalloc_array(pointer,type,count) ((type *) repalloc(pointer, sizeof(type) * (count)))
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/* sprintf into a palloc'd buffer --- these are in psprintf.c */
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externchar*psprintf(constchar*fmt,...)pg_attribute_printf(1,2);
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externsize_tpvsnprintf(char*buf,size_tlen,constchar*fmt,va_listargs)pg_attribute_printf(3,0);

‎src/include/utils/palloc.h

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@@ -80,6 +80,28 @@ extern void *palloc_extended(Size size, int flags);
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externvoid*repalloc(void*pointer,Sizesize);
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externvoidpfree(void*pointer);
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/*
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* Variants with easier notation and more type safety
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*/
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/*
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* Allocate space for one object of type "type"
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*/
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#definepalloc_object(type) ((type *) palloc(sizeof(type)))
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#definepalloc0_object(type) ((type *) palloc0(sizeof(type)))
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/*
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* Allocate space for "count" objects of type "type"
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*/
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#definepalloc_array(type,count) ((type *) palloc(sizeof(type) * (count)))
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#definepalloc0_array(type,count) ((type *) palloc0(sizeof(type) * (count)))
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/*
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* Change size of allocation pointed to by "pointer" to have space for "count"
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* objects of type "type"
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*/
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#definerepalloc_array(pointer,type,count) ((type *) repalloc(pointer, sizeof(type) * (count)))
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/*
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* The result of palloc() is always word-aligned, so we can skip testing
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* alignment of the pointer when deciding which MemSet variant to use.

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