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65 lines
2.3 KiB
65 lines
2.3 KiB
5 months ago
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from typing import List, Optional, Union
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import torchgen.api.meta as meta
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import torchgen.api.structured as structured
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from torchgen.api.types import kernel_signature
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from torchgen.context import with_native_function_and_index
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from torchgen.model import BackendIndex, NativeFunction, NativeFunctionsGroup
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from torchgen.utils import mapMaybe
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@with_native_function_and_index
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def gen_unstructured(f: NativeFunction, backend_index: BackendIndex) -> Optional[str]:
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sig = kernel_signature(f, backend_index)
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metadata = backend_index.get_kernel(f)
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if metadata is None:
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return None
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if "legacy::" in metadata.kernel:
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return None
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else:
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prefix = "static" if backend_index.external else "TORCH_API"
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return f"{prefix} {sig.decl(name=metadata.kernel)};"
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@with_native_function_and_index
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def gen_structured(g: NativeFunctionsGroup, backend_index: BackendIndex) -> List[str]:
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meta_name = meta.name(g)
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out_args = structured.impl_arguments(g)
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metadata = backend_index.get_kernel(g)
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if metadata is None:
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return []
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prefix = "" if backend_index.external else "TORCH_API "
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return [
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f"""\
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struct {prefix}structured_{metadata.kernel} : public at::meta::structured_{meta_name} {{
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void impl({', '.join(a.decl() for a in out_args)});
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}};
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"""
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]
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# Generates NativeFunctions.h, a list of forward declarations of all
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# actual kernel definitions we keep in aten/src/ATen/native/
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@with_native_function_and_index
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def compute_native_function_declaration(
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g: Union[NativeFunctionsGroup, NativeFunction], backend_index: BackendIndex
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) -> List[str]:
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metadata = backend_index.get_kernel(g)
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if isinstance(g, NativeFunctionsGroup):
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if metadata is not None and metadata.structured:
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if backend_index.external:
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# Structured hasn't been tested with external backends yet.
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raise AssertionError(
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"Structured external backend functions are not implemented yet."
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)
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else:
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return gen_structured(g, backend_index)
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else:
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return list(
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mapMaybe(lambda f: gen_unstructured(f, backend_index), g.functions())
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)
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else:
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x = gen_unstructured(g, backend_index)
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return [] if x is None else [x]
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