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249 lines
9.2 KiB
249 lines
9.2 KiB
5 months ago
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from typing import List, Tuple
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from torchgen.api import cpp
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from torchgen.api.types import Binding, CppSignatureGroup, CType
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from torchgen.model import (
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Argument,
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BaseTy,
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BaseType,
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ListType,
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NativeFunction,
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OptionalType,
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Type,
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)
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# This file generates the code for unboxing wrappers, i.e., the glue logic to unbox a boxed operator and convert the
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# ivalues from stack to correct arguments to the unboxed kernel, based on corresponding JIT schema. This codegen is
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# an alternative way to generate unboxing wrappers similar to the existing C++ metaprogramming approach but gets the
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# job done statically. These generated unboxing wrappers will be useful under the scenario where we need to register
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# a fixed set of operators known at compile time and thus can save some time in runtime initialization phase.
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#
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# Here's an example on how the codegen works:
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#
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# - Function Schema (source of truth)
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#
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# aten::empty.names(int[] size, *, Dimname[]? names,
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# ScalarType? dtype=None, Layout? layout=None,
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# Device? device=None, bool? pin_memory=None,
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# MemoryFormat? memory_format=None) -> Tensor
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# - Argument Conversion
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# Generates C++ code to convert an ivalue (from stack) to its underlying C++ type.
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# - int[] size
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# ```cpp
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# const c10::List<c10::IValue> size_list_in = (std::move(peek(stack, 0, 7))).toList();
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#
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# std::vector<int64_t> size_vec;
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# for (c10::IValue size_elem: size_list_in) {
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# int64_t size_base = size_elem.to<int64_t>();
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# size_vec.push_back(size_base);
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# }
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# at::ArrayRef<int64_t> size_list_out(size_vec);
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# ~~~~~~~~~~~~~ <-- The converted argument from ivalues in the stack.
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# Will be passed to unboxed kernel.
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# ```
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# - Dimname[]? names
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# ```cpp
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# c10::optional<c10::IValue> names_opt = (std::move(peek(stack, 1, 7))).toOptional<c10::IValue>();
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# c10::optional<at::ArrayRef<at::Dimname>> names_opt_out;
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# if (names_opt.has_value()) {
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# ~~~~~~~~~~~ <-- Unwrapping optional shell
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# const c10::IValue names_opt_in = names_opt.value();
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# const c10::List<c10::IValue> names_list_in = names_opt_in.toList();
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#
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# std::vector<at::Dimname> names_vec;
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# for (c10::IValue names_elem: names_list_in) {
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# ~~~~~~~~~~~~~~~~~~~~~~~~~ <-- Unrolling list, then convert elements one by one.
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# at::Dimname names_base = names_elem.to<at::Dimname>();
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# names_vec.push_back(names_base);
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# }
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# at::ArrayRef<at::Dimname> names_list_out(names_vec);
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#
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# names_opt_out = c10::optional<at::ArrayRef<at::Dimname>>(names_list_out);
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# } else {
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# names_opt_out = c10::optional<at::ArrayRef<at::Dimname>>();
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# }
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# ```
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# - ScalarType? dtype (similarly for the rest of the arguments)
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# ```cpp
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# c10::optional<c10::IValue> dtype_opt = (std::move(peek(stack, 2, 7))).toOptional<c10::IValue>();
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# c10::optional<at::ScalarType> dtype_opt_out;
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# if (dtype_opt.has_value()) {
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# const c10::IValue dtype_opt_in = dtype_opt.value();
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# at::ScalarType dtype_base = dtype_opt_in.to<at::ScalarType>();
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# ~~~~~~~~~~~~~~~~~~~~ <-- For base types, convert ivalue to it
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# directly using ".to<T>()" API.
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# dtype_opt_out = c10::optional<at::ScalarType>(dtype_base);
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# } else {
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# dtype_opt_out = c10::optional<at::ScalarType>();
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# }
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# ```
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#
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# - Unboxed Kernel Call
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# ```cpp
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# auto result_ = torch::empty(
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# size_list_out,
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# names_opt_out,
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# options,
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# memory_format_opt_out
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# );
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# ```
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#
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# - Push Result Back to Stack
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# ```cpp
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# drop(stack, 7);
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# pack(stack, std::move(result_));
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# ```
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connector = "\n\t"
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# Return unboxing function name for a NativeFunction
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def name(f: NativeFunction) -> str:
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return f.func.name.unambiguous_name()
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# Convert all the arguments in a NativeFunction to C++ code
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def convert_arguments(f: NativeFunction) -> Tuple[List[Binding], List[str]]:
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# we need the 'self' argument so method needs to be False
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args = (
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CppSignatureGroup.from_native_function(f, method=False)
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.most_faithful_signature()
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.arguments()
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)
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code_list = [
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f"c10::IValue {args[i].name} = std::move(peek(stack, {i}, {len(args)}));"
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for i in range(len(args))
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] + [""]
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binding_list = []
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for arg in args:
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# expecting only Argument
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if not isinstance(arg.argument, Argument):
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raise Exception(
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f"Unexpected argument type, expecting `Argument` but got {arg}"
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)
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argument: Argument = arg.argument
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unboxed_name, _, code, decl = argumenttype_ivalue_convert(
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argument.type,
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argument.name,
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mutable=argument.is_write,
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)
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code_list.extend(decl)
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code_list.extend(code)
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binding_list.append(arg.with_name(unboxed_name))
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return binding_list, code_list
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# Takes in the type, name and mutability corresponding to an argument, and generates a tuple of:
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# (1) the C++ code necessary to unbox the argument
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# (2) A Binding corresponding to the newly created unboxed variable, including variable name and its CType
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def argumenttype_ivalue_convert(
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t: Type, arg_name: str, *, mutable: bool = False
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) -> Tuple[str, CType, List[str], List[str]]:
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# Unboxing is for mobile, which doesn't care about SymInts
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ctype = cpp.argumenttype_type(
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t=t, mutable=mutable, binds=arg_name, symint=False
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).type
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if isinstance(t, BaseType):
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out_name = f"{arg_name}_base"
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code, decl = _gen_code_base_type(
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arg_name=arg_name, out_name=out_name, ctype=ctype
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)
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elif isinstance(t, OptionalType):
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out_name = f"{arg_name}_opt_out"
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code, decl = _gen_code_optional_type(
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arg_name=arg_name,
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out_name=out_name,
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t=t,
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ctype=ctype,
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)
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elif isinstance(t, ListType):
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out_name = f"{arg_name}_list_out"
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code, decl = _gen_code_list_type(
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arg_name=arg_name,
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out_name=out_name,
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t=t,
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ctype=ctype,
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)
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else:
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raise Exception(f"Cannot handle type {t}. arg_name: {arg_name}")
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return out_name, ctype, code, decl
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def _gen_code_base_type(
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arg_name: str, out_name: str, ctype: CType
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) -> Tuple[List[str], List[str]]:
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return [
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f"{ctype.cpp_type(strip_ref=True)} {out_name} = {arg_name}.to<{ctype.cpp_type(strip_ref=True)}>();"
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], []
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def _gen_code_optional_type(
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arg_name: str, out_name: str, t: OptionalType, ctype: CType
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) -> Tuple[List[str], List[str]]:
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in_name = f"{arg_name}_opt_in"
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res_name, _, res_code, decl = argumenttype_ivalue_convert(t.elem, in_name)
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return (
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f"""
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c10::optional<c10::IValue> {arg_name}_opt = {arg_name}.toOptional<c10::IValue>();
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{ctype.cpp_type(strip_ref=True)} {out_name};
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if ({arg_name}_opt.has_value()) {{
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const c10::IValue {in_name} = {arg_name}_opt.value();
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{connector.join(res_code)}
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{out_name} = {ctype.cpp_type(strip_ref=True)}({res_name});
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}} else {{
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{out_name} = {ctype.cpp_type(strip_ref=True)}();
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}}
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""".split(
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"\n"
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),
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decl,
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)
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def _gen_code_list_type(
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arg_name: str, out_name: str, t: ListType, ctype: CType
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) -> Tuple[List[str], List[str]]:
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in_name = f"{arg_name}_list_in"
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elem_name = f"{arg_name}_elem"
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code = [f"const c10::List<c10::IValue> {in_name} = {arg_name}.toList();"]
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res_name, res_ctype, res_code, decl = argumenttype_ivalue_convert(t.elem, elem_name)
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# handle list type with size, e.g., bool[4]
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if isinstance(t.elem, BaseType) and t.elem.name == BaseTy.bool and t.size:
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code.extend(
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f"""
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{ctype.cpp_type(strip_ref=True)} {out_name} = as_array<{res_ctype.cpp_type(strip_ref=True)}, {t.size}>({in_name});
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""".split(
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"\n"
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)
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)
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# we have to use c10::List for optional element. e.g., Tensor?[] -> c10::List<c10::optional<at::Tensor>>
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elif isinstance(t.elem, OptionalType):
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code.extend(
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f"""
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{ctype.cpp_type(strip_ref=True)} {out_name};
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for (c10::IValue {elem_name}: {in_name}) {{
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{connector.join(res_code)}
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{out_name}.push_back({res_name});
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}}
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""".split(
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"\n"
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)
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)
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else:
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# use ArrayRef as default.
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vec_name = arg_name + "_vec"
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# need to bring vector instantiation out of scope so that ArrayRef has valid data
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decl.append(f"std::vector<{res_ctype.cpp_type(strip_ref=True)}> {vec_name};")
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code.extend(
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f"""
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for (c10::IValue {elem_name}: {in_name}) {{
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{connector.join(res_code)}
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{vec_name}.push_back({res_name});
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}}
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{ctype.cpp_type(strip_ref=True)} {out_name}({vec_name});
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""".split(
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"\n"
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)
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)
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return code, decl
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