feat[dace]: Computing SDFG call arguments (#1398)

Added a function to get the arguments to call an SDFG.

This commit adds a function that allows to generate the arguments needed to call an SDFG, before this was part of `run_dace_iterator()`.
This made it very complex to run an SDFG outside this function.

One should consider this as an amend to [PR #1379](#1379).

src/gt4py/next/program_processors/runners/dace_iterator/__init__.py

@@ -90,8 +90,9 @@ def preprocess_program(
     return fencil_definition
 
 
-def get_args(params: Sequence[itir.Sym], args: Sequence[Any]) -> dict[str, Any]:
-    return {name.id: convert_arg(arg) for name, arg in zip(params, args)}
+def get_args(sdfg: dace.SDFG, args: Sequence[Any]) -> dict[str, Any]:
+    sdfg_params: Sequence[str] = sdfg.arg_names
+    return {sdfg_param: convert_arg(arg) for sdfg_param, arg in zip(sdfg_params, args)}
 
 
 def _ensure_is_on_device(
@@ -127,13 +128,16 @@ def get_shape_args(
 
 
 def get_offset_args(
-    arrays: Mapping[str, dace.data.Array], params: Sequence[itir.Sym], args: Sequence[Any]
+    sdfg: dace.SDFG,
+    args: Sequence[Any],
 ) -> Mapping[str, int]:
+    sdfg_arrays: Mapping[str, dace.data.Array] = sdfg.arrays
+    sdfg_params: Sequence[str] = sdfg.arg_names
     return {
         str(sym): -drange.start
-        for param, arg in zip(params, args)
+        for sdfg_param, arg in zip(sdfg_params, args)
         if common.is_field(arg)
-        for sym, drange in zip(arrays[param.id].offset, get_sorted_dim_ranges(arg.domain))
+        for sym, drange in zip(sdfg_arrays[sdfg_param].offset, get_sorted_dim_ranges(arg.domain))
     }
 
 
@@ -189,6 +193,45 @@ def get_cache_id(
     return m.hexdigest()
 
 
+def get_sdfg_args(sdfg: dace.SDFG, *args, **kwargs) -> dict[str, Any]:
+    """Extracts the arguments needed to call the SDFG.
+
+    This function can handle the same arguments that are passed to `run_dace_iterator()`.
+
+    Args:
+        sdfg:               The SDFG for which we want to get the arguments.
+    """  # noqa: D401
+    offset_provider = kwargs["offset_provider"]
+    on_gpu = kwargs.get("on_gpu", False)
+
+    neighbor_tables = filter_neighbor_tables(offset_provider)
+    device = dace.DeviceType.GPU if on_gpu else dace.DeviceType.CPU
+
+    dace_args = get_args(sdfg, args)
+    dace_field_args = {n: v for n, v in dace_args.items() if not np.isscalar(v)}
+    dace_conn_args = get_connectivity_args(neighbor_tables, device)
+    dace_shapes = get_shape_args(sdfg.arrays, dace_field_args)
+    dace_conn_shapes = get_shape_args(sdfg.arrays, dace_conn_args)
+    dace_strides = get_stride_args(sdfg.arrays, dace_field_args)
+    dace_conn_strides = get_stride_args(sdfg.arrays, dace_conn_args)
+    dace_offsets = get_offset_args(sdfg, args)
+    all_args = {
+        **dace_args,
+        **dace_conn_args,
+        **dace_shapes,
+        **dace_conn_shapes,
+        **dace_strides,
+        **dace_conn_strides,
+        **dace_offsets,
+    }
+    expected_args = {
+        key: value
+        for key, value in all_args.items()
+        if key in sdfg.signature_arglist(with_types=False)
+    }
+    return expected_args
+
+
 def build_sdfg_from_itir(
     program: itir.FencilDefinition,
     *args,
@@ -248,8 +291,6 @@ def run_dace_iterator(program: itir.FencilDefinition, *args, **kwargs):
     offset_provider = kwargs["offset_provider"]
 
     arg_types = [type_translation.from_value(arg) for arg in args]
-    device = dace.DeviceType.GPU if on_gpu else dace.DeviceType.CPU
-    neighbor_tables = filter_neighbor_tables(offset_provider)
 
     cache_id = get_cache_id(program, arg_types, column_axis, offset_provider)
     if build_cache is not None and cache_id in build_cache:
@@ -281,29 +322,7 @@ def run_dace_iterator(program: itir.FencilDefinition, *args, **kwargs):
         if build_cache is not None:
             build_cache[cache_id] = sdfg_program
 
-    dace_args = get_args(program.params, args)
-    dace_field_args = {n: v for n, v in dace_args.items() if not np.isscalar(v)}
-    dace_conn_args = get_connectivity_args(neighbor_tables, device)
-    dace_shapes = get_shape_args(sdfg.arrays, dace_field_args)
-    dace_conn_shapes = get_shape_args(sdfg.arrays, dace_conn_args)
-    dace_strides = get_stride_args(sdfg.arrays, dace_field_args)
-    dace_conn_strides = get_stride_args(sdfg.arrays, dace_conn_args)
-    dace_offsets = get_offset_args(sdfg.arrays, program.params, args)
-
-    all_args = {
-        **dace_args,
-        **dace_conn_args,
-        **dace_shapes,
-        **dace_conn_shapes,
-        **dace_strides,
-        **dace_conn_strides,
-        **dace_offsets,
-    }
-    expected_args = {
-        key: value
-        for key, value in all_args.items()
-        if key in sdfg.signature_arglist(with_types=False)
-    }
+    expected_args = get_sdfg_args(sdfg, *args, **kwargs)
 
     with dace.config.temporary_config():
         dace.config.Config.set("compiler", "allow_view_arguments", value=True)