M2 spine: JitDebugBacktrace + JitStreamContextCreate lowering (#1056) - #1854
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…1419) Harden LLVM lowering scaffolds for debug_backtrace() and stream_context_create() (packVariables / __value__writeHashtable patterns). Grow compiler_lib_spine_smoke to 584/588 inventory units and sync North Star 2 footnotes. JIT call() enablement remains deferred: MCJIT still segfaults on nested frame hashtables (#1378) and empty/no-op runs for stream_context_create (#1377) until follow-up. Closes #1419 batch for these Jit* leaves. Co-authored-by: Cursor <cursoragent@cursor.com>
This was referenced May 25, 2026
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Summary
North Star 2 / M2 spine growth toward full
bin/vm.phpinventory (#1056, #1419):ext/standard/JitDebugBacktrace.phpandJitStreamContextCreate.phptocompiler_lib_spine_smoke(584 / 588 units, ~99%).HashTableHelper::packVariablesfor frame rows, correct__value__writeHashtableoperand (raw__hashtable__*likeJitGetObjectVars).development-status.md/self-host-target.md/roadmap-wave3.mdfootnotes and regeneratedocs/bootstrap-inventory.md(588 files).JIT enablement (deferred)
Wiring
call()to these lowerings was prototyped but not enabled on this PR:debug_backtracestream_context_createCapability matrix still shows VM-only JIT for both; follow-up PR will flip rows once green.
Test plan
BootstrapSelfhostBundleTest(584 spine count + AOT lint)SelfhostSpineCountSyncTestDebugBacktraceBuiltinTest/StreamContextCreateBuiltinTest(VM)./script/ci-fast.sh --filter BootstrapSelfhostBundleTest|SelfhostSpineCountSyncTest|DebugBacktraceBuiltinTest|StreamContextCreateBuiltinTestin Docker (tar pipe)Closes #1419 (batch: Jit* leaves for #1377/#1378).
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