This regressed when I optimized $wholeText. The previous code used xmlStrcat
which implicitly checked for a NULL argument, but now it's a direct memcpy
which you shouldn't pass null pointers to, although it won't result in a
crash because memcpy doesn't do anything if the length is 0.
- PHP_SETUP_LIBXML arguments quoted
- Help texts updated for HAVE_LIBXML, HAVE_DOM, HAVE_XMLREADER,
HAVE_XMLWRITER, HAVE_SOAP, HAVE_SIMPLEXML, and HAVE_XML CPP macros
- Duplicate HAVE_LIBXML symbol definition in PHP_SETUP_LIBXML M4 macro
removed (the HAVE_LIBXML marks that PHP libxml extension is available and
not only that libxml2 library is available)
Lower branches suffer from this as well but we cannot change the
behaviour there.
We also add NULL checks to check for allocation failure.
Closes GH-15014.
I don't know why this code was here in the first place, it is present
since the initial implementation. It doesn't make sense because:
1. It would require updating the refcounts if the document wasn't
actually already set.
2. We enforce that the document is the same as the target document by
this point, so setting the tree is pointless.
Quoted m4_normalize will expand and change its argument later in the
macro call when M4 is processing the *.m4 sources. Without quotes the
already normalized string is passed to the macro directly. In these
specific cases generated configure script is the same. This is more for
consistency to have this synced and not repeat the pattern too much
in the future when copy/pasting. Note, that many AC_* macros require
similar behavior already (for example, AC_CHECK_FUNCS.)
This introduces a new helper php_dom_create_nullable_object() that does
the NULL check and puts NULL in return_value. Otherwise it runs
php_dom_create_object(). This deduplicates a bit of code.
Use our own string builder instead of using libxml's and then having to
copy over.
For the following test:
```
$dom = Dom\HTMLDocument::createEmpty();
$root = $dom->appendChild($dom->createElement('root'));
$root->append('abc', 'def', 'ghi');
$f = $root->firstChild;
for ($i = 0; $i < 1000000; $i++)
$f->wholeText;
```
The following results were obtained on an i7-4790:
```
Benchmark 1: ./sapi/cli/php x.php
Time (mean ± σ): 57.2 ms ± 2.3 ms [User: 53.2 ms, System: 3.4 ms]
Range (min … max): 54.7 ms … 69.3 ms 52 runs
Benchmark 2: ./sapi/cli/php_old x.php
Time (mean ± σ): 89.4 ms ± 3.4 ms [User: 85.6 ms, System: 3.0 ms]
Range (min … max): 86.1 ms … 105.8 ms 32 runs
Summary
./sapi/cli/php x.php ran
1.56 ± 0.09 times faster than ./sapi/cli/php_old x.php
```
It's indeed possible this is NULL. When you create a new text-like node
in libxml and pass NULL as content, you do get NULL in the content field
instead of the empty string. You can hit this by creating DOMText or
DOMComment directly and not passing any argument. This could also be
created internally.
We refactor the code such that this detail is hidden and we add a test
to check that it correctly throws an exception.
When building ext/xmlreader with phpize, also ext/dom/dom_ce.h needs to
be installed by dom extension as it is used in
the ext/xmlreader/php_xmlreader.c.
cd ext/xmlreader
phpize
./configure
make
Closes GH-14978
The template element in HTML 5 is special in the sense that it does not
add its contents into the DOM tree, but instead keeps them in a separate
shadow DOM document fragment. Interacting with the DOM tree cannot touch
the elements in the document fragment.
Closes GH-14906.
We don't need to reconcile when we clone into the same document because
the namespace mapper is the same. Only when cloning into another
document is the namespace mapper different and do we need a
reconciliation.
