On A72, google-benchmark measure before and after the patch:
--------------------------------------------------------------
Benchmark Time CPU Iterations
--------------------------------------------------------------
BM_hash_init_before 43.6 ns 43.6 ns 16052937
BM_hash_init_after 27.0 ns 27.0 ns 25877296
Patch written by Ali Saidi <alisaidi@amazon.com>
and Sebastian Pop <spop@amazon.com>
HT_FLAGS() includes the full flag word, including the iterator
count. When we're fully reassigning it, we need to make sure that
we either really do want to copy the iterator count (as in some
cases in array.c) or we need to mask only the actual flag byte.
Add an assert to hash_iterators_del() to make sure the iterator
count is non-zero (which is how I ran into this) and make sure that
the iterator count is correctly preserved during array splicing.
When a HT iterator is one past the end and we rehash, we need to make
sure that it is move to the new one past the end position, to make
sure that newly inserted elements are picked up.
In the hash position APIs, make sure we always advance to the next
non-undef element and not just when the position is 0 (similar to
what foreach does). This can happen when the position of an
ArrayIterator is one past its current end and a new element is
inserted not directly at that position because the array is packed.
There is still a bug here (as shown in the tests), but this is a
separate issue that also affects plain array iteration in foreach.
When a connection is closed, we also need to remove the hash entry
from the regular_list, as it now points to freed memory. To do this
store a reverse mapping from the connection to the hash string.
It would be nicer to introduce a wrapping structure for the pgsql
link resource that could store the hash (and notices), but that would
require large changes to the extension, so I'm going for a more
minimal fix here.
This patch removes the so called local variables defined per
file basis for certain editors to properly show tab width, and
similar settings. These are mainly used by Vim and Emacs editors
yet with recent changes the once working definitions don't work
anymore in Vim without custom plugins or additional configuration.
Neither are these settings synced across the PHP code base.
A simpler and better approach is EditorConfig and fixing code
using some code style fixing tools in the future instead.
This patch also removes the so called modelines for Vim. Modelines
allow Vim editor specifically to set some editor configuration such as
syntax highlighting, indentation style and tab width to be set in the
first line or the last 5 lines per file basis. Since the php test
files have syntax highlighting already set in most editors properly and
EditorConfig takes care of the indentation settings, this patch removes
these as well for the Vim 6.0 and newer versions.
With the removal of local variables for certain editors such as
Emacs and Vim, the footer is also probably not needed anymore when
creating extensions using ext_skel.php script.
Additionally, Vim modelines for setting php syntax and some editor
settings has been removed from some *.phpt files. All these are
mostly not relevant for phpt files neither work properly in the
middle of the file.
The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.
In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.
This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.
Removed useless filename and lineno arguments, used in DEBUG build.
The patch doesn't break source compatibility of public API (only binary compatibility).
- Avoid iterators check/update on each HashTable update opration
- Keep position equal (or above) nNumUsed instead of HT_INVALID_IDX
- Fixed iterators handling in array_unshift()
* PHP-7.2:
Don't keep HashTable.pDestructor in SHM and always set it into ZVAL_PTR_DTOR in zval_array_dup(). Keeping pointer to a function in SHM is not safe because of ASLR.
* PHP-7.1:
Don't keep HashTable.pDestructor in SHM and always set it into ZVAL_PTR_DTOR in zval_array_dup(). Keeping pointer to a function in SHM is not safe because of ASLR.
