pytorch

eca98fed - split out NamedCType from CType. Remove direct string comparison from autograd codegen (#55334)

split out NamedCType from CType. Remove direct string comparison from autograd codegen (#55334) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/55334 The goal of this PR is to clean up some of the autograd codegen to compare C++ types using `CType` objects instead of raw strings. My last PR in the stack made that string comparison a little more fragile, since the raw C++ strings needed to be namespace-aware. I confirmed byte-for-byte no codegen changes vs. the last PR (which added namespaces to the codegen) by running `diff -qr ../pytorch-common_test/torch/csrc/autograd/generated/ ../pytorch-callgrind_test_after2/torch/csrc/autograd/generated/` and `diff -qr ../pytorch-common_test/build/aten/src/ATen/ ../pytorch-callgrind_test_after2/build/aten/src/ATen/` Note that a better end-state for the autograd codegen would be to do all of its type pattern matching directly off of JIT types, instead of off of CType’s (which are really just generated from JIT types, incorporating C++ specific semantics). That looks like it’ll require a pretty substantial change though, so I’m not doing it in this PR. As part of this change (and after talking with ezyang), I split off the `CType` data class into a separate `NamedCType` class, which holds a name and a `CType`. This way, `CType` only knows about actual C++ types, making it easier to compare CType’s to each other in the codegen when we only care about the type. The core change is in `types.py`, but it required a bunch of downstream changes to update all of the places where we create `CType`s to create `NamedCType`s instead. The main change in the autograd codegen was that I updated `SavedAttribute` to store a `NamedCType`. The other autograd changes all pretty much came from that change. Test Plan: Imported from OSS Reviewed By: bhosmer Differential Revision: D27708347 Pulled By: bdhirsh fbshipit-source-id: 3e07c80569c7b229c638f389e76e319bff6315f9