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carbon-lang/toolchain/benchmarking
Chandler Carruth c578085840 Add determinism checks for generated source size and fix a crash (#7917)
Benchmarks are only comparable if the source generator produces the same
number of lines and bytes for a given configuration with any seed. Test
this across many seeds and class shapes, and check it in the compile
benchmark for the files it generates. Also check that generation emits
every name in its name pools, which the byte count depends on.

With field-heavy classes, generation could crash depending on the
shuffle. A class becomes a valid type only after its field types are
chosen, so references to the last class can only go on its own return
and parameter types. When the shuffled pool left more references to it
than that, `GetValidTypeName` found no valid type and failed its check.
Cap the references to each class at its number of functions and methods,
each of which has a return type that can use it, and replace the removed
references with fixed types so the byte count stays seed-independent.

Assisted-by: Claude Code
2026-10-09 16:58:56 +00:00
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