Update copyright headers to 2017

Fixed bug #72014 (Including a file with anonymous classes multiple times leads to fatal error)

Happy new year (Update copyright to 2016)

opcache: Patch SSE based fast_memcpy() implementation

Use _mm_store_si128() instead of _mm_stream_si128(). This ensures that copied memory
is preserved in data cache, which is good as th

opcache: Patch SSE based fast_memcpy() implementation

Use _mm_store_si128() instead of _mm_stream_si128(). This ensures that copied memory
is preserved in data cache, which is good as the interpretor will start to use this
data without the need to go back to memory. _mm_stream* is intended to be used for
stores where we want to avoid reading data into the cache and the cache pollution;
in our scenario it seems that preserving the data in cache has a positive impact.

Tests on WordPress 4.1 show ~1% performance increase with fast_memcpy() in place
versus standard memcpy() when running php-cgi -T10000 wordpress/index.php.

I also updated SW prefetching on target memory but its contribution is almost negligible.
The address to be prefetched will be used in a couple of cycles (at the next iteration)
while the data from memory will be available in >100 cycles.

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Fixed bug #70067 (Cross-compile failure in opcache when SIZEOF_ZEND_LONG < SIZEOF_SIZE_T)

Fixed Bug #70058 Build fails when building for i386

(I don't have a m32 build env, so this is not tested)

Use ZSTR_ API to access zend_string elements (this is just renaming without semantick changes).

Removed opcache.load_comments configuration directive. Now doc comments loading costs nothing and always enabled.

Use better zend_hash_* functions

Improved script copyining from SHM to process memory

Improved hash table copying

Added experimental (disabled by default) file based opcode cache.

Use new hash iteration API.

Change the error message for colliding class/interface/trait names to be a little more clearer.

C:\> php -r "interface stdClass { }"
Error: Cannot declare interface stdClass, because

Change the error message for colliding class/interface/trait names to be a little more clearer.

C:\> php -r "interface stdClass { }"
Error: Cannot declare interface stdClass, because the name is already in use in Command Line Code on line 1

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Change "Cannot redeclare class X" into "Cannot redeclare class/interface/trait X", meaning that the following:

C:\> php -r "trait A { } trait A { }"

Will now properly print "Cannot

Change "Cannot redeclare class X" into "Cannot redeclare class/interface/trait X", meaning that the following:

C:\> php -r "trait A { } trait A { }"

Will now properly print "Cannot redeclare trait A" instead of "Cannot redeclare class A" to make error messages a tiny bit clearer. Admittedly, a better solution can most likely be made by actually telling what the colliding object is a type of.

Internally this adds a new function:
zend_get_object_type()

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Second prefetch is useless, because cahce line on modern x86 CPUs is 64 bytes long.

Changed HashTable layout:

Removed HashTable->arHash (reduced memory consumption). Now hash slots may be accessed using HT_HASH() macro.
Hash slotas are allocated together with Buckets (b

Changed HashTable layout:

Removed HashTable->arHash (reduced memory consumption). Now hash slots may be accessed using HT_HASH() macro.
Hash slotas are allocated together with Buckets (before them) and lay in reverse order from HashTable->arData base address (see comments in Zend/zend_types.h)
Indexes in hash table and conflict resolution chains (Z_NEXT) may be stored as indeces or offsets in bytes, depending on system (32 or 64-bit).
HashTable data filelds are reordered to keep the most useful for zend_hash_find() data in the same CPU cache line.

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Avoid useless op_array duplication

Improved code for class property inheritance

Unused vars

Use fast SSE2 memcpy() for copying block of data from SHM to process memory

Simplify reallocation during copying data from SHM to process memory

don't count op_arrays stored in opcache SHM

Removed dead code

Lazy duplication of op_array->static_variables