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.

Fixed incorrect behavior of internal memory debugger

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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Remove HAVE_LIMITS_H

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

Since PHP requires at least C89

Remove HAVE_LIMITS_H

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

Since PHP requires at least C89 or greater, the `HAVE_LIMITS_H` symbol
defined by Autoconf in configure.ac [2] can be ommitted and simplifed
however due to bundled file library (libmagic) and timelib still using
it, the removal there was omitted and done only in Zend.m4 file.

Current bundled libraries libtime, oniguruma, and libmagic still include
partial `HAVE_LIMITS_H` usage and will be more refactored when this is
possible.

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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Implemented a faster way to access predefined TSRM resources - CG(), EG(), etc.

Avoid reinitailization of ZTS cache pointer. Initialize it once in TSRM.c

Fix shifting signed values too far

Signed shift of 31 for int and 63 for long is flagged as undefined
behavior by UBSan (-fsanitize=undefined) and seems to be indeed so
according to

Fix shifting signed values too far

Signed shift of 31 for int and 63 for long is flagged as undefined
behavior by UBSan (-fsanitize=undefined) and seems to be indeed so
according to the standard.

The patch converts such cases to use unsigned.

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Unused parameter

Keep original debug info

Fix typos in code comments in Zend/ [skip ci]

Make MADV_HUGEPAGE conditional on USE_ZEND_ALLOC_HUGE_PAGES

There have been multiple reports of large slowdowns due to the
use of MADV_HUGEPAGE, so make it conditional on
USE_ZEND_AL

Make MADV_HUGEPAGE conditional on USE_ZEND_ALLOC_HUGE_PAGES

There have been multiple reports of large slowdowns due to the
use of MADV_HUGEPAGE, so make it conditional on
USE_ZEND_ALLOC_HUGE_PAGES, just like MAP_HUGETLB already is.

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