Removed invalid checks

ZEND_FETCH_*_R operations simplified and can't be used with EXT_TYPE_UNUSED flag any more. Thit is very rare and useless case. ZEND_FREE might be required after them instead.

Simplified string offset reading

Fixed bug #52237 (Crash when passing the reference of the property of a non-object)

Fixed bug #52237 (Crash when passing the reference of the property of a non-object)

Removed redundant code

Fixed bug #52041 (Memory leak when writing on uninitialized variable returned from function)

Fixed bug #52041 (Memory leak when writing on uninitialized variable returned from function)

- Let's generate this #ifdef only on zend_vm_execute.h

- Let's generate this #ifdef only on zend_vm_execute.h

- Update

- show the free_op1 warning only once, until a fix is applied

- show the free_op1 warning only once, until a fix is applied

Fixed exception handling in GOTO VM

Added caches to eliminate repeatable run-time bindings of functions, classes, constants, methods and properties

- Added check for constant creation on Traits
- Simplified trait flag check
- Test++ :)

Added compiler hints

Optimized access to static properties using executor specialization. A constant class name may be used as a direct operand of ZEND_FETCH_* instruction without previous ZEND_FETCH_CLASS.

- Fix trait flag identification

- Added check for abstract class

abstract class foo { }
class T { use foo; } // T cannot use foo - it is not a trait

- Added check for trait on NEW

trait a { }

- Added check for abstract class

abstract class foo { }
class T { use foo; } // T cannot use foo - it is not a trait

- Added check for trait on NEW

trait a { }
new a; // Cannot instantiate trait a

# Tests for errors comming soon :)

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ws

- Reimplemented ZEND_INIT_FCALL_BY_NAME and ZEND_INIT_NS_FCALL_BY_NAME to use literals instead of additional operands
- Optimized access to global constants

Add DTrace probes

Use fast class fetch function

Implemented Traits for PHP as proposed in the RFC [TRAITS]

# RFC http://wiki.php.net/rfc/horizontalreuse#traits_-_reuse_of_behavior
# Ok, here we go, I guess that will result in more dis

Implemented Traits for PHP as proposed in the RFC [TRAITS]

# RFC http://wiki.php.net/rfc/horizontalreuse#traits_-_reuse_of_behavior
# Ok, here we go, I guess that will result in more discussion, which is fine
# by me. But now, the patch is here, and properly archived.
#
# See below a list of notes to the patch, it also includes a list of
# points which should be fixed
#
# Internals of the Traits Patch
# -----------------------------
#
# Open TODOs
# """"""""""
#
# - Reflection API
# - support for traits for internal classes
# - currently destroy_zend_class does not handle that case
#
# Introduced Structures
# """""""""""""""""""""
#
# Data structures to encode the composition information specified in the
# source:
# - zend_trait_method_reference
# - zend_trait_precedence
# - zend_trait_alias
#
# Changes
# """""""
#
# zend_class_entry
# - uses NULL terminated lists of pointers for
# - trait_aliases
# - trait_precedences
# - do you prefer an explicit counter?
# - the information is only necessary during class composition
# but might be interesting for reflection
# - did not want to blow up class further with not really necessary length counters
#
# added keywords
# - trait
# - insteadof
#
# Added opcodes
# ZEND_ADD_TRAIT
# - similar to ZEND_ADD_INTERFACE
# - adds the trait to the list of traits of a class, no actual composition done
# ZEND_BIND_TRAITS
# - emitted in zend_do_end_class_declaration
# - concludes the class definition and will initiate the trait composition
# when the class definition is encountered during runtime
#
# Added Flags
# ZEND_ACC_TRAIT = 0x120
# ZEND_ACC_IMPLEMENT_TRAITS = 0x400000
# ZEND_FETCH_CLASS_TRAIT = 14
#
# zend_vm_execute.h
# - not sure whether the handler initialization (ZEND_ADD_TRAIT_SPEC_HANDLER,
# ZEND_BIND_TRAITS_SPEC_HANDLER) is correct, maybe it should be more selective
#
# zend_compile.c
# - refactored do_inherit_method_check
# split into do_inherit_method_check and do_inheritance_check_on_method
# - added helper functions use a '_' as prefix and are not mentioned in the
# headers
# - _copy_functions
# prepare hash-maps of functions which should be merged into a class
# here the aliases are handled
# - _merge_functions
# builds a hash-table of the methods which need to be added to a class
# does the conflict detection
# - reused php_runkit_function_copy_ctor
# - it is not identical with the original code anymore, needed to update it
# think I fixed some bugs, not sure whether all have been reported back to runkit
# - has to be renamed, left the name for the moment, to make its origin obvious
# - here might be optimization potential
# - not sure whether everything needs to be copied
# - copying the literals might be broken
# - added it since the literals array is freed by efree and gave problems
# with doubled frees
# - all immutable parts of the zend_op array should not be copied
# - am not sure which parts are immutable
# - and not sure how to avoid doubled frees on the same arrays on shutdown
# - _merge_functions_to_class
# does the final merging with the target class to handle inherited
# and overridden methods
# - small helper for NULL terminated lists
# zend_init_list, zend_add_to_list
#
# zend_language_parser.y
# - reused class definition for traits
# - there should be something with regard to properties
# - if they get explicitly defined, it might be worthwhile to
# check that there are no collisions with other traits in a composition
# (however, I would not introduce elaborate language features to control that
# but a notice for such conflicts might be nice to the developers)

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