php-in-php: JIT StringPrintRJit — route print_r() through VmVar PHP not __compiler_print_r LLVM (#1492)

[PurHur]

Category

php-in-php · stdlib

Problem

print_r() VM logic lives in PHP (ext/standard/print_r.php, VmVar) but JIT/AOT still lower to __compiler_print_r with a parallel LLVM implementation in lib/JIT/Builtin/StringPrintRJit.php (formerly phpc_print_r.c).

Property-hook hiding (#8854), enum cases, and recursion guards must not be implemented twice (VM PHP vs LLVM).

php-src reference

• php/php-src ext/standard/var.c — php_print_r, php_print_r_impl

Repro

<?php
class C { public int $x = 1; }
ob_start();
print_r(new C());
$s = ob_get_clean();
echo $s;

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php repro_print_r.php
php bin/jit.php repro_print_r.php'

Scope (this repo)

Layer	Path
VM	ext/standard/print_r.php, ext/standard/VmVar.php
JIT today	lib/JIT/Builtin/StringPrintRJit.php
Target	JIT invokes PHP VmVar::printR (or compiled native shim); shrink LLVM

Pairs #9188 (var_export) and #8854 (property hooks in dumps).

Done when

• JIT print_r() output matches VM/Zend on repro
• StringPrintRJit.php LLVM dumper removed or thin ABI only
• Compliance guard under test/compliance/cases/stdlib/print_r*.phpt
• PR body: php-src var.c ref + LLVM lines removed count

Related

• Stdlib: print_r()/var_dump() on property-hooked objects must hide private hook backing fields (zend_property_hooks.c, php-src-strict) #8854 property-hooked object dumps
• php-in-php: JIT StringReadfile — route readfile() through VmFs PHP not __compiler_readfile libc LLVM (#1492) #9188 var_export JIT migration
• North star: Epic: Self-host critical path — compiler compiles itself (M3→M5) #1492

[PurHur]

claim: PHP Runtime → PHP — batch (issues #9195, #9190)

[PurHur]

Merged via #11192 (paired with #9195)

Verification:

• ./vendor/bin/phpunit --filter PrintRRuntimeShrink → OK
• ./vendor/bin/phpunit --filter print_r_jit test/compliance/ → OK
• php bin/jit.php test/repro-maintainer/parity_print_r_var_dump_jit.php → matches VM
• JIT embed path routes through PrintRJitHelper → VmPrintR (thin StringPrintR bridge); standalone AOT keeps StringPrintRJit LLVM monolith.