Switch to bison location tracking

Locations for AST nodes are now tracked with the help of bison
location tracking. This is more accurate than what we currently do
and easier to exte

Switch to bison location tracking

Locations for AST nodes are now tracked with the help of bison
location tracking. This is more accurate than what we currently do
and easier to extend with more information.

A zend_ast_loc structure is introduced, which is used for the location
stack. Currently it only holds the start lineno, but can be extended
to also hold end lineno and offset/column information in the future.

All AST constructors now accept a zend_ast_loc* as first argument, and
will use it to determine their lineno. Previously this used either the
CG(zend_lineno), or the smallest AST lineno of child nodes.

On the parser side, the location structure for a whole rule can be
obtained using the &@$ character salad.

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Remove unnecessary precedence/associativity annotations

Some of these are entirely unnecessary. Some specify an associativity
for operators where the concept doesn't make sense and has n

Remove unnecessary precedence/associativity annotations

Some of these are entirely unnecessary. Some specify an associativity
for operators where the concept doesn't make sense and has no effect:
Explicit associativity is only meaningful for binary operators. For
unary operators and constrained operations like instanceof or assignment
the associativity specification has no effect and only serves to confuse.

For example assignments were specified as %left, even though they will
actually behave as right-associative due to the variable requirement on
the LHS. Similarly instanceof was specified as %nonassoc, but it will
behave as left-associative, due to the restrictions places on the RHS.

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Remove local variables

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

Remove local variables

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.

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Adios, yearly copyright ranges

Implement ??= operator

RFC: https://wiki.php.net/rfc/null_coalesce_equal_operator

$a ??= $b is $a ?? ($a = $b), with the difference that $a is only
evaluated once, to the degree

Implement ??= operator

RFC: https://wiki.php.net/rfc/null_coalesce_equal_operator

$a ??= $b is $a ?? ($a = $b), with the difference that $a is only
evaluated once, to the degree that this is possible. In particular
in $a[foo()] ?? $b function foo() is only ever called once.
However, the variable access themselves will be reevaluated.

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Implement typed properties

RFC: https://wiki.php.net/rfc/typed_properties_v2

This is a squash of PR #3734, which is a squash of PR #3313.

Co-authored-by: Bob Weinand <bobwe

Implement typed properties

RFC: https://wiki.php.net/rfc/typed_properties_v2

This is a squash of PR #3734, which is a squash of PR #3313.

Co-authored-by: Bob Weinand <bobwei9@hotmail.com>
Co-authored-by: Joe Watkins <krakjoe@php.net>
Co-authored-by: Dmitry Stogov <dmitry@zend.com>

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Introduce separate ZEND_AST_CLASS_NAME AST node

Instead of representing this as a ZEND_AST_CLASS_CONST with a
"class" constant name.

Class constants and ::class are unrelated fe

Introduce separate ZEND_AST_CLASS_NAME AST node

Instead of representing this as a ZEND_AST_CLASS_CONST with a
"class" constant name.

Class constants and ::class are unrelated features that happen to
share syntax, so represent and handle them separately.

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Future-proof email addresses

Update email addresses. We're still @Zend, but future proofing it...

Avoid hash lookups in BIND_STATIC and BIND_LEXICAL opcode handlers.
Encode static variable offset into opline->extended_value.

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
use

Remove unused Git attributes ident

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.

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Remove expr_without_variable

We no longer need this distinction.

Fixed bug #75218

I've introduced a new CompileError type, from which ParseError
inherits. These errors are not parse errors in the narrow sense
of the term, even though they happen t

Fixed bug #75218

I've introduced a new CompileError type, from which ParseError
inherits. These errors are not parse errors in the narrow sense
of the term, even though they happen to be generated during
parsing in our implementation. Additionally reusing the ParseError
class for this purpose would change existing error messages (if
the exception is not caught) from a "Fatal error:" to a "Parse
error:" prefix, and also the error kind from E_COMPILE_ERROR to
E_PARSE.

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Use zend_string_release_ex() instread of zend_string_release() in places, where we sure about string persistence.

Use cheaper functions

Revert "Handle scanner error in first place (don't hide them from ext/tokenizer) and cheaper whitespace handlig."

This reverts commit 0d6da03f5c3e49b92cf6817ba8a7f8d6f60ee1aa.

Handle scanner error in first place (don't hide them from ext/tokenizer) and cheaper whitespace handlig.

year++

year++

Allow trailing commas in function and method calls

further sync for vim mode lines

Add trailing comma syntax support for mixed and unmixed group use lists

RFC: https://wiki.php.net/rfc/list-syntax-trailing-commas

Interned strings unification for TS/NTS

Hereby, interned strings are supported in thread safe PHP. The patch
implements two types of interned strings

- interning per process, st

Interned strings unification for TS/NTS

Hereby, interned strings are supported in thread safe PHP. The patch
implements two types of interned strings

- interning per process, strings are not freed till process end
- interning per request, strings are freed at request end

There is no runtime interning.

With Opcache, all the permanent iterned strings are copied into SHM on
startup, additional copying into SHM might happen on demand.

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Update copyright headers to 2017

Merge branch 'PHP-7.1'