Move config variables from numba to numba_dppy (#15)

Variables in module numba_dppy.config are renamed.
They do not use `DPPY_` prefix:
SAVE_DPPL_IR_FILES -> SAVE_IR_FILES

Environament variables should have `NUMBA_DPPY_` prefix:
NUMBA_SAVE_DPPL_IR_FILES -> NUMBA_DPPY_SAVE_IR_FILES
NUMBA_SPIRV_VAL -> NUMBA_DPPY_SPIRV_VAL

Author: PokhodenkoSA

numba_dppy/config.py

@@ -1,6 +1,36 @@
+import os
+
+
 try:
     import dpctl
 
     dppy_present = dpctl.has_sycl_platforms() and dpctl.has_gpu_queues()
 except:
     dppy_present = False
+
+
+def _readenv(name, ctor, default):
+    """Original version from numba\core\config.py
+    class _EnvReloader():
+        ...
+        def process_environ():
+            def _readenv(): ...
+    """
+    value = os.environ.get(name)
+    if value is None:
+        return default() if callable(default) else default
+    try:
+        return ctor(value)
+    except Exception:
+        warnings.warn(
+            "environ %s defined but failed to parse '%s'" % (name, value),
+            RuntimeWarning,
+        )
+        return default
+
+
+# Save intermediate files being generated by DPPY
+SAVE_IR_FILES = _readenv("NUMBA_DPPY_SAVE_IR_FILES", int, 0)
+
+# Turn SPIRV-VALIDATION ON/OFF switch
+SPIRV_VAL = _readenv("NUMBA_DPPY_SPIRV_VAL", int, 0)

numba_dppy/spirv_generator.py

@@ -7,6 +7,7 @@
 import tempfile
 
 from numba import config
+from numba_dppy import config as dppy_config
 from numba_dppy.target import LINK_ATOMIC
 
 
@@ -61,7 +62,7 @@ def generate(self, ipath, opath):
         #     b) hoist all allocas to the enty block of the module
         check_call(["opt","-O1","-o",ipath+'.bc',ipath])
         check_call(["llvm-spirv","-o",opath,ipath+'.bc'])
-        if config.SAVE_DPPL_IR_FILES == 0:
+        if dppy_config.SAVE_IR_FILES == 0:
             os.unlink(ipath + '.bc')
 
     def link(self, opath, binaries):
@@ -84,12 +85,12 @@ def __init__(self, context):
     def __del__(self):
         # Remove all temporary files
         for afile in self._tempfiles:
-            if config.SAVE_DPPL_IR_FILES != 0:
+            if dppy_config.SAVE_IR_FILES != 0:
                 print(afile)
             else:
                 os.unlink(afile)
         # Remove directory
-        if config.SAVE_DPPL_IR_FILES == 0:
+        if dppy_config.SAVE_IR_FILES == 0:
             os.rmdir(self._tmpdir)
 
     def _create_temp_file(self, name, mode='wb'):
@@ -136,7 +137,7 @@ def finalize(self):
             self._cmd.link(spirv_path, binary_paths)
 
         # Validate the SPIR-V code
-        if config.SPIRV_VAL == 1:
+        if dppy_config.SPIRV_VAL == 1:
             try:
                 self._cmd.validate(ipath=spirv_path)
             except CalledProcessError: