Fix thread safe build

Add sceleton for yield* expression

This does not yet actually implement any delegation.

Fix backtraces and func_get_args()

To make the generator function show up in backtraces one has to insert an
additional execute_data into the chain, as prev_execute_data->function_state

Fix backtraces and func_get_args()

To make the generator function show up in backtraces one has to insert an
additional execute_data into the chain, as prev_execute_data->function_state
is used to determine the called function.

Adding the additional stack frame is also required for func_get_args(), as
the arguments are fetched from there too. The arguments have to be copied
in order to keep them around. Due to the way they are saved doing so is
quite ugly, so I added another function zend_copy_arguments to zend_execute.c
which handles this.

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Fix cloning of generator methods

Forgot to add a reference to the this variable

Properly handle yield during method calls

Improve backtraces from generators

The current situation is still not perfect, as the generator function itself
does not appear in the stack trace. This makes sense in some way, but it

Improve backtraces from generators

The current situation is still not perfect, as the generator function itself
does not appear in the stack trace. This makes sense in some way, but it
would probably be more helpful if it would show up (with the bound arguments)
after the $generator->xyz() call. This could be misleading too though as the
function is not *really* called there.

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Add cloning support for generators

Generators can now be cloned. I'm pretty sure that my current code does not
yet cover all the edge cases of cloning the execution context, so there are

Add cloning support for generators

Generators can now be cloned. I'm pretty sure that my current code does not
yet cover all the edge cases of cloning the execution context, so there are
probably a few bugs in there :)

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Make $generator->send() return the current value

This makes the API easier to use (and is consistent with Python and JS).

Allow yielding during function calls

During function calls arguments are pushed onto the stack. Now these are
backed up on yield and restored on resume. This requires memcpy'ing them,

Allow yielding during function calls

During function calls arguments are pushed onto the stack. Now these are
backed up on yield and restored on resume. This requires memcpy'ing them,
but there doesn't seem to be any better way to do it.

Also this fixes the issue with exceptions thrown during function calls.

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Add auto-increment keys

When no key is explicitely yielded PHP will used auto-incrementing keys
as a fallback. They behave the same as with arrays, i.e. the key is the
successor of t

Add auto-increment keys

When no key is explicitely yielded PHP will used auto-incrementing keys
as a fallback. They behave the same as with arrays, i.e. the key is the
successor of the largest previously used integer key.

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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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Add $generator->close() method

Calling $generator->close() is equivalent to executing a return statement
at the current position in the generator.

Fix segfault when send()ing to a closed generator

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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Properly free resources when generator return value not used

To keep things clean two new functions are introduced:

zend_clean_and_cache_symbol_table(HashTable *symbol_table)
ze

Properly free resources when generator return value not used

To keep things clean two new functions are introduced:

zend_clean_and_cache_symbol_table(HashTable *symbol_table)
zend_free_compiled_variables(zval ***CVs, int num)

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Set EG(current_execute_data)

This fixes several issues. In particular it makes method generators work
properly and also allows generators using a symbol table.

Free loop variables

If the generator is closed before it has finished running, it may happen
that some FREE or SWITCH_FREE opcodes haven't been executed and memory is
leaked.

Free loop variables

If the generator is closed before it has finished running, it may happen
that some FREE or SWITCH_FREE opcodes haven't been executed and memory is
leaked.

This fixes it by walking the brk_cont_array and manually freeing the
variables.

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Add support for generator methods

Remove wrong dtor call

Close generator on return

Implement return for generators

For generators ZEND_RETURN directly calls ZEND_VM_RETURN(), thus passing
execution back to the caller (zend_generator_resume).

This commit also a

Implement return for generators

For generators ZEND_RETURN directly calls ZEND_VM_RETURN(), thus passing
execution back to the caller (zend_generator_resume).

This commit also adds a check that only return; is used in generators and
not return $value;.

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Add YIELD opcode implementation

Add way to pass generator object to opcode handlers

The generator zval is put into the return_value_ptr_ptr.

Add support for executing a zend_execute_data

This adds another function execute_ex(), which accepts a zend_execute_data
struct to run (contrary to execute(), which accepts a zend_op_arr

Add support for executing a zend_execute_data

This adds another function execute_ex(), which accepts a zend_execute_data
struct to run (contrary to execute(), which accepts a zend_op_array from
which it initialized the execute_data).

This needs a bit more cleanup.

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Add dummy Iterator implementation

This simply adds dummy rewind/valid/current/key/next methods to Generator.