php-in-php: drop always-on LibcExtern __phpc_resolve_stream after NestedJIT module-local (#32273 shape)

[PurHur]

Category

php-in-php · runtime-shrink (#1492, peer #32273 malloc / #32092 snprintf / #31885 memcpy)

Problem

Always-on LibcExtern still registers __phpc_resolve_stream on every JIT/AOT module even though:

1. The body is PHP/LLVM (StreamGlobalsJit standalone / JitStreamLibcHandleKernel embed) — not a libc symbol and not an MCJIT host alias.
2. NestedJIT stream leaves (JitStreamIoKernel / JitStreamSyncKernel) already declare the same int8*(int64) prototype module-locally, then lookupFunction. Their ensureExternal catch path calls addFunction() without getNamedFunction() — the Fix: AOT link fails for EVERY binary — duplicate memset declaration #31894 / Release v1.1.0: fix cold-build-check compile_failed on hello world (LLVM Module.php line 180; re-#24302) #32122 class (name.1 with no body).
3. The always-on table comment already says it is the small MCJIT alias set (syscall / __phpc_host_*). __phpc_resolve_stream is leftover.

Path	Today	Target
Resolve body	StreamGlobalsJit / JitStreamLibcHandleKernel	unchanged
LibcExtern	always-on __phpc_resolve_stream row	drop row
NestedJIT consumers	rely on always-on + local addFunction	LibcExtern::ensureResolveStreamDecl() before lookup
EMBED MCJIT aliases	syscall / __phpc_host_*	unchanged (#98 / #21109 / #21124)

php-src reference

• php/php-src main/streams/streams.c — stream handle lookup / _php_stream_get (reference only; this ABI is the compiler's FILE* handle table, not php-src C)

PHP implementation target

• lib/JIT/LibcExtern.php — drop '__phpc_resolve_stream' always-on row; add ensureResolveStreamDecl() (peer ensureMallocFamily php-in-php: drop always-on LibcExtern malloc/realloc/free after NestedJIT module-local (#32092 shape) #32273 / ensureMemcpyDecl php-in-php: drop always-on LibcExtern memcpy after NestedJIT module-local (#31863 shape) #31885) using getNamedFunction() first
• NestedJIT JitStreamIoKernel / JitStreamSyncKernel call ensureResolveStreamDecl() before lookupFunction('__phpc_resolve_stream')
• StreamGlobalsJit / JitStreamLibcHandleKernel keep implementing the body
• test/unit/LibcExternDeadDeclsRuntimeShrinkTest.php + dedicated shrink guard
• Do not add new runtime/*.c logic (phpc_stream.c already deleted)

Repro

./script/phpunit.sh --filter 'LibcExternDeadDeclsRuntimeShrinkTest|ResolveStreamRuntimeShrinkTest|StreamGlobalsRuntimeStandaloneTest'

Done when

• LibcExtern has no always-on '__phpc_resolve_stream' => row
• NestedJIT lookupFunction('__phpc_resolve_stream') sites call ensureResolveStreamDecl() first
• Standalone still LLVM-lowers __phpc_resolve_stream with a body (StreamGlobalsRuntimeStandaloneTest)
• syscall / __phpc_host_php_write / __phpc_host_snprintf remain
• php-src-strict; user-script fopen()/fwrite() unchanged

[PurHur]

claim: php-in-php — drop always-on LibcExtern __phpc_resolve_stream; NestedJIT module-local ensureResolveStreamDecl (#32273 shape, #32122 addFunction name.1 class)