Move static from_ivalue/to_ivalue to new shim_common.cpp (pytorch#166373)

Move `from_ivalue` and `to_ivalue` and their dependents `StableIValueBoxedKernel`, `aoti_torch_library_impl` `aoti_torch_call_dispatcher` into new (non-aoti shim_common.cpp)

This is in prep for the above PRs where I add v2s (`torch_call_dispatcher` and `torch_library_impl`) that are versioning aware

Pull Request resolved: pytorch#166373
Approved by: https://github.com/janeyx99
ghstack dependencies: pytorch#164356

Author: mikaylagawarecki

build_variables.bzl

@@ -482,6 +482,7 @@ inductor_core_resources = [
     "torch/csrc/inductor/aoti_torch/oss_proxy_executor.cpp",
     "torch/csrc/inductor/inductor_ops.cpp",
     "torch/csrc/jit/serialization/pickle.cpp",
+    "torch/csrc/shim_common.cpp",
 ]
 
 libtorch_core_sources = sorted(

torch/csrc/inductor/aoti_torch/shim_common.cpp

@@ -1406,169 +1406,6 @@ AOTITorchError aoti_torch_zero_(AtenTensorHandle tensor) {
   });
 }
 
-static StableIValue from_ivalue(
-    const c10::TypePtr& type,
-    const c10::IValue& ivalue) {
-  switch (type->kind()) {
-    case c10::TypeKind::TensorType: {
-      AtenTensorHandle ath = torch::aot_inductor::new_tensor_handle(
-          std::move(const_cast<at::Tensor&>(ivalue.toTensor())));
-      return torch::stable::detail::from(ath);
-    }
-    case c10::TypeKind::IntType: {
-      return torch::stable::detail::from(ivalue.toInt());
-    }
-    case c10::TypeKind::FloatType: {
-      return torch::stable::detail::from(ivalue.toDouble());
-    }
-    case c10::TypeKind::BoolType: {
-      return torch::stable::detail::from(ivalue.toBool());
-    }
-    case c10::TypeKind::ScalarTypeType: {
-      return torch::stable::detail::from(ivalue.toScalarType());
-    }
-    case c10::TypeKind::DeviceObjType: {
-      return torch::stable::detail::from(ivalue.toDevice());
-    }
-    case c10::TypeKind::LayoutType: {
-      return torch::stable::detail::from(ivalue.toLayout());
-    }
-    case c10::TypeKind::MemoryFormatType: {
-      return torch::stable::detail::from(ivalue.toMemoryFormat());
-    }
-    case c10::TypeKind::OptionalType: {
-      auto inner_type = type->castRaw<at::OptionalType>()->getElementType();
-
-      // ideally, if we had the C++ type corresponding to inner_type, which we
-      // will denote as inner_type::t (does not actually exist), we would be
-      // able to follow the patterned semantic of every other case here in one
-      // line:
-      //
-      // return
-      // torch::stable::detail::from<std::optional<inner_type::t>>(ivalue.toInnerTypeT()));
-      //
-      // BUT we do NOT have that type inner_type::t readily available, so we
-      // will manually unwrap and recursively call. This implementation MUST
-      // be kept in sync with torch::stable::detail::from<std::optional<T>>
-      // function in torch/csrc/stable/stableivalue_conversions.h
-      if (ivalue.isNone()) {
-        return torch::stable::detail::from(std::nullopt);
-      }
-      StableIValue* sivp = new StableIValue(from_ivalue(inner_type, ivalue));
-      return torch::stable::detail::from(sivp);
-    }
-    default: {
-      TORCH_CHECK(
-          false,
-          "Not yet supported conversion from IValue to StableIValue for schema type: ",
-          type->str());
-    }
-  }
-}
-
-static c10::IValue to_ivalue(
-    const c10::TypePtr& type,
-    const StableIValue stable_ivalue) {
-  switch (type->kind()) {
-    case c10::TypeKind::TensorType: {
-      auto ret_raiiath = torch::aot_inductor::RAIIAtenTensorHandle(
-          torch::stable::detail::to<AtenTensorHandle>(stable_ivalue));
-      return (c10::IValue(*torch::aot_inductor::tensor_handle_to_tensor_pointer(
-          ret_raiiath.get())));
-    }
-    case c10::TypeKind::IntType: {
-      return c10::IValue(torch::stable::detail::to<int64_t>(stable_ivalue));
-    }
-    case c10::TypeKind::FloatType: {
-      return c10::IValue(torch::stable::detail::to<double>(stable_ivalue));
-    }
-    case c10::TypeKind::BoolType: {
-      return c10::IValue(torch::stable::detail::to<bool>(stable_ivalue));
-    }
-    case c10::TypeKind::ScalarTypeType: {
-      return c10::IValue(
-          torch::stable::detail::to<c10::ScalarType>(stable_ivalue));
-    }
-    case c10::TypeKind::DeviceObjType: {
-      return c10::IValue(torch::stable::detail::to<c10::Device>(stable_ivalue));
-    }
-    case c10::TypeKind::LayoutType: {
-      return c10::IValue(torch::stable::detail::to<c10::Layout>(stable_ivalue));
-    }
-    case c10::TypeKind::MemoryFormatType: {
-      return c10::IValue(
-          torch::stable::detail::to<c10::MemoryFormat>(stable_ivalue));
-    }
-    case c10::TypeKind::OptionalType: {
-      auto inner_type = type->castRaw<at::OptionalType>()->getElementType();
-
-      // ideally, if we had the C++ type corresponding to inner_type, which we
-      // will denote as inner_type::t (does not actually exist), we would be
-      // able to follow the patterned semantic of every other case here in one
-      // line:
-      //
-      // return
-      // c10::IValue(torch::stable::detail::to<std::optional<inner_type::t>>(stable_ivalue));
-      //
-      // BUT we do NOT have that type inner_type::t readily available, so we
-      // will manually unwrap and recursively call. This implementation MUST
-      // be kept in sync with the torch::stable::detail::to<T> function in
-      // torch/csrc/stable/stableivalue_conversions.h
-      if (stable_ivalue == torch::stable::detail::from(std::nullopt)) {
-        return c10::IValue();
-      }
-      auto sivp = torch::stable::detail::to<StableIValue*>(stable_ivalue);
-      auto ival = to_ivalue(inner_type, *sivp);
-      delete sivp;
-      return ival;
-    }
-    default: {
-      TORCH_CHECK(
-          false,
-          "Not yet supported conversion from StableIValue to IValue for schema type: ",
-          type->str());
-    }
-  }
-}
-
-class StableIValueBoxedKernel : public c10::OperatorKernel {
- public:
-  StableIValueBoxedKernel(void (*fn)(StableIValue*, uint64_t, uint64_t))
-      : fn_(fn) {}
-
-  void operator()(
-      const c10::OperatorHandle& op,
-      c10::DispatchKeySet keyset,
-      torch::jit::Stack* stack) {
-    const auto& schema = op.schema();
-    const auto num_returns = schema.returns().size();
-    const auto num_arguments = schema.arguments().size();
-
-    auto ministack =
-        std::make_unique<StableIValue[]>(std::max(num_arguments, num_returns));
-
-    for (const auto idx : c10::irange(num_arguments)) {
-      const auto ministack_idx = num_arguments - idx - 1;
-      const c10::TypePtr& arg_type = schema.arguments()[ministack_idx].type();
-      ministack[ministack_idx] = from_ivalue(arg_type, torch::jit::pop(stack));
-    }
-
-    // boxed function is going to take a stack of StableIValues, cast them to
-    // our schema values, and run the function and modify the StableIValue stack
-    fn_(ministack.get(), num_arguments, num_returns);
-
-    // read the output from the end of the stack and wrap that back into
-    // IValue from StableIValue
-    for (size_t idx = 0; idx < num_returns; idx++) {
-      const c10::TypePtr& ret_type = schema.returns()[idx].type();
-      torch::jit::push(stack, to_ivalue(ret_type, ministack[idx]));
-    }
-  }
-
- private:
-  void (*fn_)(StableIValue*, uint64_t, uint64_t);
-};
-
 AOTITorchError aoti_torch_library_init_impl(
     const char* ns,
     const char* k,
@@ -1618,18 +1455,6 @@ AOTITorchError aoti_torch_library_init_fragment(
   });
 }
 
-AOTI_TORCH_EXPORT AOTITorchError aoti_torch_library_impl(
-    TorchLibraryHandle self,
-    const char* name,
-    void (*fn)(StableIValue*, uint64_t, uint64_t)) {
-  AOTI_TORCH_CONVERT_EXCEPTION_TO_ERROR_CODE({
-    reinterpret_cast<torch::Library*>(self)->impl(
-        name,
-        torch::CppFunction::makeFromBoxedFunctor(
-            std::make_unique<StableIValueBoxedKernel>(fn)));
-  });
-}
-
 AOTI_TORCH_EXPORT AOTITorchError
 aoti_torch_library_def(TorchLibraryHandle self, const char* name) {
   AOTI_TORCH_CONVERT_EXCEPTION_TO_ERROR_CODE(
@@ -1642,40 +1467,6 @@ aoti_torch_delete_library_object(TorchLibraryHandle tlh) {
       { delete reinterpret_cast<torch::Library*>(tlh); });
 }
 
-AOTITorchError aoti_torch_call_dispatcher(
-    const char* opName,
-    const char* overloadName,
-    StableIValue* stack) {
-  AOTI_TORCH_CONVERT_EXCEPTION_TO_ERROR_CODE({
-    const auto op =
-        c10::Dispatcher::singleton().findSchemaOrThrow(opName, overloadName);
-    const auto& schema = op.schema();
-    const auto num_returns = schema.returns().size();
-    const auto num_arguments = schema.arguments().size();
-
-    torch::jit::Stack ivalue_stack;
-    // we will only need max(num_args, num_returns)
-    ivalue_stack.reserve(std::max(num_arguments, num_returns));
-
-    // convert StableIValue stack to c10::IValue stack
-    for (const auto idx : c10::irange(num_arguments)) {
-      auto stable_ivalue = stack[idx];
-      auto arg_type = schema.arguments()[idx].type();
-      torch::jit::push(ivalue_stack, to_ivalue(arg_type, stable_ivalue));
-    }
-
-    op.callBoxed(ivalue_stack);
-
-    // there should then be num_returns IValues on the stack, which
-    // we will convert to StableIValue and repopulate user input stack
-    for (const auto idx : c10::irange(num_returns)) {
-      const auto stack_idx = num_returns - idx - 1;
-      const c10::TypePtr& ret_type = schema.returns()[idx].type();
-      stack[stack_idx] = from_ivalue(ret_type, torch::jit::pop(ivalue_stack));
-    }
-  });
-}
-
 AOTITorchError aoti_torch_create_device_guard(
     int32_t device_index,
     DeviceGuardHandle* ret_guard // returns new reference