Require parenthesis around yield expressions

If yield is used in an expression context parenthesis are now required.
This ensures that the code is unambiguos.

Yield statements c

Require parenthesis around yield expressions

If yield is used in an expression context parenthesis are now required.
This ensures that the code is unambiguos.

Yield statements can still be used without parenthesis (which should be
the most common case).

Also yield expressions without value can be used without parenthesis,
too (this should be the most common case for coroutines).

If the yield expression is used in a context where parenthesis are required
anyway, no additional parenthesis have to be inserted.

Examples:

// Statements don't need parenthesis
yield $foo;
yield $foo => $bar;

// Yield without value doesn't need parenthesis either
$data = yield;

// Parentheses don't have to be duplicated
foo(yield $bar);
if (yield $bar) { ... }

// But we have to use parentheses here
$foo = (yield $bar);

This commit also fixes an issue with by-ref passing of $foo[0] like
variables. They previously weren't properly fetched for write.

Additionally this fixes valgrind warnings which were caused by access to
uninitialized memory in zend_is_function_or_method_call().

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Remove asterix modifier (*) for generators

Generators are now automatically detected by the presence of a `yield`
expression in their body.

This removes the ZEND_SUSPEND_AND_RET

Remove asterix modifier (*) for generators

Generators are now automatically detected by the presence of a `yield`
expression in their body.

This removes the ZEND_SUSPEND_AND_RETURN_GENERATOR opcode. Instead
additional checks for ZEND_ACC_GENERATOR are added to the fcall_common
helper and zend_call_function.

This also adds a new function zend_generator_create_zval, which handles
the actual creation of the generator zval from an op array.

I feel like I should deglobalize the zend_create_execute_data_from_op_array
code a bit. It currently changes EG(current_execute_data) and
EG(opline_ptr) which is somewhat confusing (given the name).

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Merge branch 'PHP-5.4'

* PHP-5.4:
Fixed bug #62357 (compile failure: (S) Arguments missing for built-in function __memcmp).

Fixed bug #62357 (compile failure: (S) Arguments missing for built-in function __memcmp).

Any C library function may be a macro, We should avoid using ZEND_STRS(L) as their arguments

Add sceleton for yield* expression

This does not yet actually implement any delegation.

Add support for yielding keys

Keys are yielded using the

yield $key => $value

syntax. Currently this is implemented as a statement only and not as an
expression, be

Add support for yielding keys

Keys are yielded using the

yield $key => $value

syntax. Currently this is implemented as a statement only and not as an
expression, because conflicts arise considering nesting and use in arrays:

yield yield $a => $b;
// could be either
yield (yield $a) => $b;
// or
yield (yield $a => $b);

Once I find some way to resolve these conflicts this should be available
as an expression too.

Also the key yielding code is rather copy-and-past-y for the value yielding
code, so that should be factored out.

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Allow to use yield without value

If the generator is used as a coroutine it often doesn't make sense to yield
anything. In this case one can simply receive values using

$val

Allow to use yield without value

If the generator is used as a coroutine it often doesn't make sense to yield
anything. In this case one can simply receive values using

$value = yield;

The yield here will simply yield NULL.

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Add support for $generator->send()

Yield now is an expression and the return value is the value passed to
$generator->send(). By default (i.e. if ->next() is called) the value is
NUL

Add support for $generator->send()

Yield now is an expression and the return value is the value passed to
$generator->send(). By default (i.e. if ->next() is called) the value is
NULL.

Unlike in Python ->send() can be run without priming the generator with a
->next() call first.

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Add zend_do_suspend_if_generator calls

The execution of generator functions will be suspended right after the
arguments were RECVed. This will be done in zend_do_suspend_if_generator.

Add flag for generator functions

Generator functions have to specify the * (asterix) modifier after the
function keyword. If they do so the ZEND_ACC_GENERATOR flag is added to
the fn

Add flag for generator functions

Generator functions have to specify the * (asterix) modifier after the
function keyword. If they do so the ZEND_ACC_GENERATOR flag is added to
the fn_flags.

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Add T_YIELD "yield" keyword

Allow arbitrary expressions for empty()

This change is as per RFC https://wiki.php.net/rfc/empty_isset_exprs.

The change allows passing the result of function calls and other
ex

Allow arbitrary expressions for empty()

This change is as per RFC https://wiki.php.net/rfc/empty_isset_exprs.

The change allows passing the result of function calls and other
expressions to the empty() language construct. This is accomplished by
simply rewriting empty(expr) to !expr.

The change does not affect the suppression of errors when using empty()
on variables. empty($undefinedVar) will continue not to throw errors.
When an expression is used inside empty() on the other hand, errors will
not be suppressed. Thus empty($undefinedVar + $somethingElse) *will*
throw a notice.

The change also does not make empty() into a real function, so using
'empty' as a callback is still not possible.

In addition to the empty() changes the commit adds nicer error messages
when isset() is used on function call results or other expressions.

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Implement const array/string dereference

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

Fix lexing of nested heredoc strings in token_get_all()

This fixes bug #60097.

Before two global variables CG(heredoc) and CG(heredoc_len) were used to
track the current heredoc

Fix lexing of nested heredoc strings in token_get_all()

This fixes bug #60097.

Before two global variables CG(heredoc) and CG(heredoc_len) were used to
track the current heredoc label. In order to support nested heredoc
strings the *previous* heredoc label was assigned as the token value of
T_START_HEREDOC and the language_parser.y assigned that to CG(heredoc).

This created a dependency of the lexer on the parser. Thus the
token_get_all() function, which accesses the lexer directly without
also running the parser, was not able to tokenize nested heredoc strings
(and leaked memory). Same applies for the source-code highlighting
functions.

The new approach is to maintain a heredoc_label_stack in the lexer, which
contains all active heredoc labels.

As it is no longer required, T_START_HEREDOC and T_END_HEREDOC now don't
carry a token value anymore.

In order to make the work with zend_ptr_stack in this context more
convenient I added a new function zend_ptr_stack_top(), which retrieves the
top element of the stack (similar to zend_stack_top()).

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Improved traits implementation. Now to support __CLASS__ constant in traits php doesn't have to copy the complete compiled method, but can reuse the same code. The resolution of __CLASS__ constants i

Improved traits implementation. Now to support __CLASS__ constant in traits php doesn't have to copy the complete compiled method, but can reuse the same code. The resolution of __CLASS__ constants in methods defined in traits are delayed till run-time. This approach also made possible to use __CLASS__ constant as default value for traits properties and method arguments.

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Improved traits implementation. Now to support __CLASS__ constant in traits php doesn't have to copy the complete compiled method, but can reuse the same code. The resolution of __CLASS__ constants i

Improved traits implementation. Now to support __CLASS__ constant in traits php doesn't have to copy the complete compiled method, but can reuse the same code. The resolution of __CLASS__ constants in methods defined in traits are delayed till run-time. This approach also made possible to use __CLASS__ constant as default value for traits properties and method arguments.

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- Year++

- Year++

- Year++

- Added class member access on instantiation (e.g. (new foo)->bar()) support

- Added class member access on instantiation (e.g. (new foo)->bar()) support

- Drop T_SCALAR_CAST

- Drop T_SCALAR_CAST

Callable typehint following the rules of is_callable($arg, false);

Callable typehint following the rules of is_callable($arg, false);