Free cached chunks when the requested memory limit is above real usage

Fix #81585: cached_chunks are not counted to real_size on shutdown

The amount of allocated system memory is kept in `real_size`, including
the allocated `cached_chunks`. Thus, we need t

Fix #81585: cached_chunks are not counted to real_size on shutdown

The amount of allocated system memory is kept in `real_size`, including
the allocated `cached_chunks`. Thus, we need to keep the proper count
at the end of the shutdown.

Closes GH-7745.

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Fixed bug #81070

When the memory limit is reduced using an `ini_set("memory_limit", ..)`
below the currently allocated memory, the out-of-memory check overflowed.
Instead of implemen

Fixed bug #81070

When the memory limit is reduced using an `ini_set("memory_limit", ..)`
below the currently allocated memory, the out-of-memory check overflowed.
Instead of implementing additional checks during allocation,
`zend_set_memory_limit()` now validates the new memory limit. When
below the current memory usage the ini_set call will fail and throw
a warning.

This is part of GH-7040.

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Update zend_alloc.c

Don't free main thunk. It will crash.

Improve type declarations for Zend APIs

Voidification of Zend API which always succeeded
Use bool argument types instead of int for boolean arguments
Use bool return type for functio

Improve type declarations for Zend APIs

Voidification of Zend API which always succeeded
Use bool argument types instead of int for boolean arguments
Use bool return type for functions which return true/false (1/0)
Use zend_result return type for functions which return SUCCESS/FAILURE as they don't follow normal boolean semantics

Closes GH-6002

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Fix tracked_realloc

We should only drop the information about the old allocation after
checking the memory limit. This makes the code a bit more awkward...

Enforce memory limit in tracked allocation mode

A very basic limit (for single allocations) was already enforced.
This extends it to count the total memory allocations.

This is

Enforce memory limit in tracked allocation mode

A very basic limit (for single allocations) was already enforced.
This extends it to count the total memory allocations.

This is useful to avoid out of memory conditions while fuzzing.

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Drop the unneeded pointer casting

The standard says that "A pointer to void may be converted to or from a
pointer to any object type". So the casting is unneeded.

REF:
*

Drop the unneeded pointer casting

The standard says that "A pointer to void may be converted to or from a
pointer to any object type". So the casting is unneeded.

REF:
* c11: http://port70.net/~nsz/c/c11/n1570.html#6.3.2.3p1
* c99: http://port70.net/~nsz/c/c99/n1256.html

Closes GH-5916

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Add crude memory limit to tracked alloc

Check whether the requested allocation size exceeds limit (rather
than the cumulative size).

This is useful to prevent allocations trigge

Add crude memory limit to tracked alloc

Check whether the requested allocation size exceeds limit (rather
than the cumulative size).

This is useful to prevent allocations triggering OOM during fuzzing.

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Fixed incorrect behavior of internal memory debugger

Fix miscellaneous typos in docs and error messages

Closes GH-4863.

Reverting push to wrong repo

Update alloc patch

Fix #78620: Out of memory error

The integer addition in `ZEND_MM_ALIGNED_SIZE_EX` can overflow, what we
have to catch early.

Revert "Fix #78620: Out of memory error"

This reverts commit 8ce04df7e0108a10f7b782a28204e9384ab1129c.

Cf. <https://github.com/php/php-src/pull/4766#discussion_r330658679>.

Fix #78620: Out of memory error

If the integer addition in `ZEND_MM_ALIGNED_SIZE_EX` overflows, the
macro evaluates to `0`, what we should catch early.

Monitoring anonymous pages on mac via vmmap tag

Fix overflow in memory limit checks

Due to overflows in the memory limit checks, we were missing cases
where the allocation size was close to the address space size, and
caused an OO

Fix overflow in memory limit checks

Due to overflows in the memory limit checks, we were missing cases
where the allocation size was close to the address space size, and
caused an OOM condition rather than a memory limit error.

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Fix custom heap free

This seems to be designed around the use-case where the custom
allocator is a wrapper around ZMM.

Add tracked allocator mode

In this case we will use the system allocator, but still remember
all allocations and free them the same way that Zend MM does. This
allows us to accuratel

Add tracked allocator mode

In this case we will use the system allocator, but still remember
all allocations and free them the same way that Zend MM does. This
allows us to accurately model leak behavior.

Enabled using USE_ZEND_ALLOC=0 USE_TRACKED_ALLOC=1.

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Fix shift UB in constants

We were shifting out the top bit of a signed integer.

Fix conditional compilation

The new symbols are shared and don't need to depend on the availability
of __builtin_constant_p.

Avoid cold code duplication

Remove unused functions

- zend_mm_bitset_find_zero
- zend_mm_bitset_find_one
- zend_mm_bitset_find_zero_and_set
- zend_is_by_ref_func_arg_fetch

Remove HAVE_SIGNAL_H

The `<signal.h>` header file is part of the standard C89 headers [1] and
on current systems can be included unconditionally.

Since file requires at least C8

Remove HAVE_SIGNAL_H

The `<signal.h>` header file is part of the standard C89 headers [1] and
on current systems can be included unconditionally.

Since file requires at least C89 or greater, the `HAVE_SIGNAL_H` symbol
defined by Autoconf in Zend.m4 [2] can be ommitted and simplifed.

The bundled libmagic (file) also ommits the usage of HAVE_SIGNAL_H since
5.35 however current version in PHP is very modified 5.34 version and
will be refactored separately. Check for HAVE_SIGNAL_H is therefore
still done in the configure.ac.

Refs:
[1] https://port70.net/~nsz/c/c89/c89-draft.html#4.1.2
[2] https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/headers.m4

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