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Ensure that string field lengths are properly aligned

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Integers should always be aligned. For some platforms (ARM, SPARC) this
is more important than for others. This changeset ensures that the
string field string lengths are aligned on *all* platforms, not just on
the SPARC for which there was a workaround. It also fixes that the
length integer can be resized to 32 bits without problems if needed.

(closes issue ASTERISK-17310)
Reported by: radael, S Adrian
Reviewed by: Tzafrir Cohen, Terry Wilson
Tested by: S Adrian

Review: https://reviewboard.asterisk.org/r/1549
........

Merged revisions 343157 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 343158 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@343163 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Walter Doekes
2011-11-02 22:02:07 +00:00
parent 55ffab4cd9
commit 7fd2a68b0e
3 changed files with 55 additions and 24 deletions
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12
include/asterisk/stringfields.h
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@@ -114,6 +114,10 @@
*/
typedef const char * ast_string_field;
/* the type of storage used to track how many bytes were allocated for a field */
typedef uint16_t ast_string_field_allocation;
/*!
\internal
\brief A constant empty string used for fields that have no other value
@@ -123,13 +127,15 @@ extern const char *__ast_string_field_empty;
/*!
\internal
\brief Structure used to hold a pool of space for string fields
\note base is aligned so base+used can stay aligned by incrementing used with
aligned numbers only
*/
struct ast_string_field_pool {
struct ast_string_field_pool *prev; /*!< pointer to the previous pool, if any */
size_t size; /*!< the total size of the pool */
size_t used; /*!< the space used in the pool */
size_t active; /*!< the amount of space actively in use by fields */
char base[0]; /*!< storage space for the fields */
char base[0] __attribute__((aligned(sizeof(ast_string_field_allocation)))); /*!< storage space for the fields */
};
/*!
@@ -293,10 +299,6 @@ void * attribute_malloc __ast_calloc_with_stringfields(unsigned int num_structs,
void __ast_string_field_release_active(struct ast_string_field_pool *pool_head,
const ast_string_field ptr);
/* the type of storage used to track how many bytes were allocated for a field */
typedef uint16_t ast_string_field_allocation;
/*!
\brief Macro to provide access to the allocation field that lives immediately in front of a string field
\param x Pointer to the string field