Add support for sycl accessors

This MR extends the sycl support:

• Adding function so that sycl::accessors can be used in the map_field function
• Changes the API of the cgh.parrallel_for to work like the API of sfg.function

src/pystencilssfg/extensions/sycl.py

@@ -6,6 +6,8 @@ import re
 from pystencils.types import PsType, PsCustomType
 from pystencils.enums import Target
 
+from pystencilssfg.composer.basic_composer import SequencerArg
+
 from ..exceptions import SfgException
 from ..context import SfgContext
 from ..composer import (
@@ -13,6 +15,7 @@ from ..composer import (
     SfgClassComposer,
     SfgComposer,
     SfgComposerMixIn,
+    make_sequence,
 )
 from ..ir.source_components import SfgKernelHandle, SfgHeaderInclude
 from ..ir import (
@@ -56,12 +59,13 @@ class SyclHandler(AugExpr):
 
         self._ctx = ctx
 
-    def parallel_for(self, range: SfgVar | Sequence[int], kernel: SfgKernelHandle):
+    def parallel_for(self, range: SfgVar | Sequence[int], kernel: SfgKernelHandle, *, extras: Sequence[SequencerArg]=[]):
         """Generate a ``parallel_for`` kernel invocation using this command group handler.
 
         Args:
             range: Object, or tuple of integers, indicating the kernel's iteration range
             kernel: Handle to the pystencils-kernel to be executed
+            extras: Statements that should be in the parallel_for but before the kernel call
         """
         self._ctx.add_include(SfgHeaderInclude("sycl/sycl.hpp", system_header=True))
 
@@ -81,7 +85,7 @@ class SyclHandler(AugExpr):
 
         id_param = list(filter(filter_id, kernel.scalar_parameters))[0]
 
-        tree = SfgKernelCallNode(kernel)
+        tree = make_sequence(*extras, SfgKernelCallNode(kernel))
 
         kernel_lambda = SfgLambda(("=",), (id_param,), tree, None)
         return SyclKernelInvoke(self, SyclInvokeType.ParallelFor, range, kernel_lambda)