mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-21 05:50:55 +08:00
Malte Ubl
20b7da29e7
The self-hosted compiler's compact IR is ~515-528M characters, a few million below V8's maximum string length (2^29 - 24). serializeModule joined it into one string, deserializeModule parsed one string, and the native bootstrap comparison read cli.ir.json and cli.ll as utf8 strings, so any compiler growth crashed --emit=ir and the bootstrap tests with "RangeError: Invalid string length". - serializeModuleParts returns the compact encoding as ordered parts (header, one part per function, remainder). serializeModule(mod, true) is their join, so the on-disk format is byte-identical. - deserializeModuleBytes splits a UTF-8 Buffer at the root object's "functions" array with a byte-level scanner and parses the header and each function separately. Malformed input falls back to the whole-document parse for its exact error. - The Node API writes --emit=ir, --emit-ir sidecars and --emit=llvm through writeTextParts (the former writeLlvmSource batching writer). - The native bootstrap harness decodes IR per function and compares LLVM as Buffers, removing ABI-check lines at the byte level. - The self-hosting serialization fixture gains a "bytes" mode so the scriptc-compiled serializer exercises both new entry points. Self-hosted compiler IR (514.6 MB, macOS arm64, Node 24.12): read old 5.85 s / 4.26 GB max RSS -> new 5.84 s / 1.36 GB write old 2.05-2.53 s / 4.48 GB -> new 2.30-2.37 s / 2.10 GB 2x module (1.03 GB): old serialize and read throw; new round-trips. The remaining per-string bound is the largest function (16.3M chars, ~33x headroom) and the header (2.3M chars).