php-in-php: StringVarDump NestedJIT → JitVmHelperLink::ensureCompiled (#1492)

[PurHur]

Category

php-in-php · runtime-shrink (#1492, peer #23097 PowInt / #23116 ArrayDiff / #22575 MathFrexp)

Problem

lib/JIT/Builtin/StringVarDump.php still hand-rolls NestedJitCompileScope::run + parseAndCompile + new JIT() for VarDumpJitHelper.php. Peer string/math runtimes route helper compile through JitVmHelperLink::ensureCompiled for consistent user-script env clearing, insert-block restore, and helper-runtime cache.

php-src reference

• php/php-src ext/standard/var.c — php_var_dump_ex (semantics unchanged; compile-path only)

PHP implementation target

• lib/JIT/Builtin/StringVarDump.php — replace ensureJitHelperCompiled body with JitVmHelperLink::ensureCompiled + lookupCompiled; drop use PHPCompiler\JIT / hand-rolled NestedJitCompileScope::run (keep ::isActive early-return if still required)
• test/unit/VarDumpRuntimeShrinkTest.php — guard JitVmHelperLink::ensureCompiled, no hand-rolled NestedJitCompileScope::run / parseAndCompile / new JIT(

Repro

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit test/unit/VarDumpRuntimeShrinkTest.php'
make bootstrap-selfhost-vm-driver-execute-probe

Done when

• StringVarDump uses JitVmHelperLink::ensureCompiled only for helper compile
• Shrink unit test green
• make bootstrap-selfhost-vm-driver-execute-probe green
• PR body cites lines removed

Refs #1492, #9195, #13241, #16565, #23097

[PurHur]

claim: PHP Runtime → PHP — starting this run (StringVarDump NestedJIT → JitVmHelperLink::ensureCompiled; peer StringPrintR #22668).

[PurHur]

Merged #23147 (f4c2c9e33)

Verification

• vendor/bin/phpunit test/unit/VarDumpRuntimeShrinkTest.php → OK (4 tests, 19 assertions)
• make bootstrap-selfhost-vm-driver-execute-probe → OK
• gen-0 fingerprint restamped in-PR (940af411268f…, unverified-restamp)

Shrink

• StringVarDump.php: −24 / +10 lines — dropped hand-rolled NestedJitCompileScope::run + parseAndCompile + new JIT(); now JitVmHelperLink::ensureCompiled (peer PrintR php-in-php: StringPrintR NestedJIT → JitVmHelperLink::ensureCompiled (#1492) #22668).