[pull] master from php:master #980
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…f it's not part of shared memory Closes GH-19551
* PHP-8.3: Fix signed int overflow in scanner
* PHP-8.4: Fix signed int overflow in scanner
…purposes Since cbf67e4, the GC needs to find all WeakMaps referencing a weakly referenced object. Doing so, it treats all ZEND_WEAKREF_TAG_MAP as WeakMap instances. However, a ZEND_WEAKREF_TAG_MAP reference may be a bare HashTable when zend_weakrefs_hash_add() is used. Introduce a new tag, ZEND_WEAKREF_TAG_BARE_HT, and use this tag when weakly referencing an object from a bare HashTable. Ignore such references in GC. Fixes GH-19543 Closes GH-19544 Co-authored-by: Tim Düsterhus <[email protected]>
* PHP-8.3: Differenciate WeakMaps from bare HashTables used as weak maps for GC purposes
* PHP-8.4: Differenciate WeakMaps from bare HashTables used as weak maps for GC purposes
Introduce the TAILCALL VM, a more efficient variant of the CALL VM: * Each opcode handler tailcalls the next opcode handler directly instead of returning to the interpreter loop. This eliminates call and interpreter loop overhead. * Opcode handlers use the preserve_none calling convention to eliminate register saving overhead. * preserve_none uses non-volatile registers for its first arguments, so execute_data and opline are usually kept in these registers and no code is required to forward them to the next handlers. Generated machine code is similar to a direct-threaded VM with register pinning, like the HYBRID VM. JIT+TAILCALL VM also benefits from this compared to JIT+CALL VM: * JIT uses the registers of the execute_data and opline args as fixed regs, eliminating the need to move them in prologue. * Traces exit by tailcalling the next handler. No code is needed to forward execute_data and opline. * No register saving/restoring in epilogue/prologue. The TAILCALL VM is used when the HYBRID VM is not supported, and the compiler supports the musttail and preserve_none attributes: The HYBRID VM is used when compiling with GCC, the TAILCALL VM when compiling with Clang>=19 on x86_64 or aarch64, and the CALL VM otherwise. This makes binaries built with Clang>=19 as fast as binaries built with GCC. Before, these were considerably slower (by 2.8% to 44% depending on benchmark, and by 5% to 77% before 76d7c61). Closes GH-17849 Closes GH-18720
Fixes GH-19507 Closes GH-19547 Co-authored-by: Arnaud Le Blanc <[email protected]>
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