php-in-php: drop leftover Type always-on utf8_encode/utf8_decode ABI shells (ext/standard/utf8.c)

[PurHur]

Category

php-in-php · runtime-shrink (#1492, peer #32875 / #32869; trust class #32122)

Problem

Builtin\Type::register() still addFunctions empty always-on shells for __compiler_utf8_encode and __compiler_utf8_decode on every JIT/AOT module. StringUtf8Latin1 already owns those ABIs (getNamedFunction first + NestedJIT bridge), but leftover Type empty decls can mint utf8_encode.1 when Runtime ABI drift lands (#31894 / #32122 class).

php-src reference

• php/php-src ext/standard/utf8.c — php_utf8_encode / php_utf8_decode

PHP implementation target

• lib/JIT/Builtin/Type.php — remove always-on utf8_encode/utf8_decode rows; Type::initialize ensureLinkeds StringUtf8Latin1
• Keep StringUtf8Latin1 / Utf8Latin1JitHelper; no new runtime/*.c
• Leave convert_uuencode Type rows alone (sentinel for peer shrink tests)

Repro

grep -n "__compiler_utf8_encode\|__compiler_utf8_decode" lib/JIT/Builtin/Type.php

Done when

• Type no longer always-declares/registers the two ABIs
• Type::initialize ensureLinks StringUtf8Latin1
• ./script/aot-smoke.sh stays 8/8
• Targeted phpunit shrink test green
• AOT utf8_encode/utf8_decode still match Zend (ignoring deprecation)

Parent

• Peer php-in-php: drop leftover Type always-on hash_equals/hash_hmac_algos/hash_algos ABI shells (ext/hash/hash.c) #32875 / php-in-php: drop leftover Type always-on openssl_pbkdf2 ABI shell (ext/openssl/openssl.c) #32869; trust class Release v1.1.0: fix cold-build-check compile_failed on hello world (LLVM Module.php line 180; re-#24302) #32122 / Fix: AOT link fails for EVERY binary — duplicate memset declaration #31894

[PurHur]

claim: compile-trust-lane-b — starting this run (lane overflow: #32122/#31968 children closed; aot-smoke 8/8; cold-build ok; #32876 claimed by other lanes)

[PurHur]

claim: runtime-migration lane — drop Type always-on utf8_encode/utf8_decode ABI shells; route via existing PHP/JIT helper path (peer #32876).

[PurHur]

runtime-migration lane implementing now (claim race with compile-trust-lane-b ~20s earlier; no PR yet — shipping the Type utf8 shell drop).

[PurHur]

claim: advanced-stdlib/ext — shipping Type utf8_encode/utf8_decode shell drop (peer #32882). Prior claims (~27m) have no PR/branch; aot-smoke 8/8 on master.

[PurHur]

merged in #32890

verification:

• ./script/phpunit.sh --filter 'TypeDeadUtf8Latin1AbiRuntimeShrinkTest' → OK (4 tests, 27 assertions)
• php script/check-selfhost-spine-coverage-sync.php → OK (7675 inventory files)
• ./script/docker-exec.sh -- bash -lc './script/aot-smoke.sh' → 8/8
• AOT utf8_encode/utf8_decode → 41|c9 matching Zend (was SIGSEGV / empty on master)

lane overflow: #32122/#31968 children closed; cold-build ok; aot-smoke 8/8 before claim.