StructuralHash
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class StructuralHash
| package ir
This includes the names of ports and any port bundle field names in the hash.
This object can performs a "structural" hash over any firrtl Module. It ignores: - [firrtl.ir.Expression Expression] types - Any [firrtl.ir.Info Info] fields - Description on DescribedStmt - each identifier name is replaced by a unique integer which only depends on the order of declaration and is thus deterministic - Module names are ignored.
Because of the way we "agnostify" bundle types, all SubField access nodes need to have a known bundle type. Thus - in a lot of cases, like after reading firrtl from a file - you need to run the firrtl type inference before hashing.
Please note that module hashes don't include any submodules. Two structurally equivalent modules are only functionally equivalent if they are part of the same circuit and thus all modules referred to in DefInstance are the same.