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Update on "Rewrite implementation of faithful cpp signatures"
This rewrite is as per my comments at #44087 (comment) I did the rewrite by reverting #44087 and then reimplementing it on top. You may find it easier to review by diffing against master with only #44087 reverted. There are two main ideas. First, we now factor cpp argument processing into two phases operating on three representations of data: 1. `FunctionSchema` - this is the source from native_functions.yaml 2. `Union[Argument, ThisArgument, TensorOptionsArgument]` - this is the arguments after doing some basic semantic analysis to group them (for TensorOptions) or identify the this argument (if this is a method). There is only ever one of these per functions. 3. `Union[CppArgument, CppThisArgument, CppTensorOptionsArgument]` - this is the arguments after we've elaborated them to C++. There may be multiple of these per actual C++ signature. You can think of (2) as common processing, whereas (3) bakes in specific assumptions about whether or not you have a faithful or non-faithful signature. Second, we now have CppSignature and CppSignatureGroup representing the *total* public C++ API signature. So those dataclasses are what know how to render definitions/declarations, and you no longer have to manually type it out in the Functions/TensorMethods codegen. Here is an exhaustive accounting of the changes. tools.codegen.api.types - CppSignature and CppSignatureGroup got moved to tools.codegen.api.types - Add new CppThisArgument and CppTensorOptionsArguments (modeled off of ThisArgument and TensorOptionsArguments) so that we can retain high level semantic structure even after elaborating terms with C++ API information. Once this is done, we can refine CppArgument.argument to no longer contain a ThisArgument (ThisArgument is always translated to CppThisArgument. Note that this doesn't apply to TensorOptionsArguments, as those may be expanded or not expanded, and so you could get a single CppArgument for 'options') - Add no_default() functional mutator to easily remove default arguments from CppArgument and friends - Add an explicit_arguments() method to CppArgument and friends to extract (flat) argument list that must be explicitly written in the signature. This is everything except (Cpp)ThisArgument, and is also convenient when you don't care about the extra structure of CppTensorOptionsArguments tools.codegen.api.cpp - group_arguments is back, and it doesn't send things directly to a CppSignatureGroup; instead, it moves us from representation (1) to (2) (perhaps it should live in model). Here I changed my mind from my PR comment; I discovered it was not necessary to do classification at grouping time, and it was simpler and easier to do it later. - argument got split into argument_not_this/argument/argument_faithful. argument and argument_faithful are obvious enough what they do, and I needed argument_not_this as a more refined version of argument so that I could get the types to work out on TensorOptionsArguments tools.codegen.api.dispatcher - Here we start seeing the payoff. The old version of this code had a "scatter" mode and a "gather" mode. We don't need that anymore: cppargument_exprs is 100% type-directed via the passed in cpp arguments. I am able to write the functions without any reference to use_c10_dispatcher tools.codegen.gen - Instead of having exprs_str and types_str functions, I moved these to live directly on CppSignature, since it seemed pretty logical. - The actual codegen for TensorMethods/Functions is greatly simplified, since (1) all of the heavy lifting is now happening in CppSignature(Group) construction, and (2) I don't need to proxy one way or another, the new dispatcher translation code is able to handle both cases no problem. There is a little faffing about with ordering to reduce the old and new diff which could be removed afterwards. Here are codegen diffs. For use_c10_dispatcher: full: ``` +// aten::_cudnn_init_dropout_state(float dropout, bool train, int dropout_seed, *, ScalarType? dtype=None, Layout? layout=None, Device? device=None, bool? pin_memory=False) -> Tensor Tensor _cudnn_init_dropout_state(double dropout, bool train, int64_t dropout_seed, const TensorOptions & options) { - return _cudnn_init_dropout_state(dropout, train, dropout_seed, optTypeMetaToScalarType(options.dtype_opt()), options.layout_opt(), options.device_opt(), options.pinned_memory_opt()); + static auto op = c10::Dispatcher::singleton() + .findSchemaOrThrow("aten::_cudnn_init_dropout_state", "") + .typed<Tensor (double, bool, int64_t, c10::optional<ScalarType>, c10::optional<Layout>, c10::optional<Device>, c10::optional<bool>)>(); + return op.call(dropout, train, dropout_seed, optTypeMetaToScalarType(options.dtype_opt()), options.layout_opt(), options.device_opt(), options.pinned_memory_opt()); } ``` Otherwise: ``` +// aten::empty_meta(int[] size, *, ScalarType? dtype=None, Layout? layout=None, Device? device=None, bool? pin_memory=None, MemoryFormat? memory_format=None) -> Tensor Tensor empty_meta(IntArrayRef size, c10::optional<ScalarType> dtype, c10::optional<Layout> layout, c10::optional<Device> device, c10::optional<bool> pin_memory, c10::optional<MemoryFormat> memory_format) { - return empty_meta(size, TensorOptions().dtype(dtype).layout(layout).device(device).pinned_memory(pin_memory), memory_format); + static auto op = c10::Dispatcher::singleton() + .findSchemaOrThrow("aten::empty_meta", "") + .typed<Tensor (IntArrayRef, const TensorOptions &, c10::optional<MemoryFormat>)>(); + return op.call(size, TensorOptions().dtype(dtype).layout(layout).device(device).pinned_memory(pin_memory), memory_format); } ``` Things that I probably did not get right: - The Union[Argument, TensorOptionsArguments, ThisArgument] and the Cpp variants are starting to get a little unwieldy. Not sure if this means I should add a supertype (or at the very least an alias); in some cases I do purposely omit one of these from the Union - Code may not necessarily live in the most logical files. There isn't very much rhyme or reason to it. - The fields on CppSignature. They're not very well constrained and it will be better if people don't use them directly. - Disambiguation. We should do this properly in #44087 and we don't need special logic for deleting defaulting for faithful signatures; there is a more general story here. Signed-off-by: Edward Z. Yang <ezyang@fb.com> Differential Revision: [D24144035](https://our.internmc.facebook.com/intern/diff/D24144035) [ghstack-poisoned]
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