[GR-71011] Backport to 25.0: Make native slot wrappers context-specific. Fixes #557.

PullRequest: graalpython/4150

Author: OracleLabsAutomation

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/capi/PyProcsWrapper.java

@@ -43,6 +43,7 @@
 import static com.oracle.graal.python.builtins.modules.cext.PythonCextBuiltins.checkThrowableBeforeNative;
 import static com.oracle.graal.python.util.PythonUtils.EMPTY_OBJECT_ARRAY;
 
+import com.oracle.graal.python.PythonLanguage;
 import com.oracle.graal.python.builtins.PythonBuiltinClassType;
 import com.oracle.graal.python.builtins.objects.PNone;
 import com.oracle.graal.python.builtins.objects.cext.capi.PythonNativeWrapper.PythonStructNativeWrapper;
@@ -136,13 +137,30 @@ protected Object execute(Object[] arguments) throws UnsupportedTypeException, Ar
     }
 
     @ExportMessage
-    protected boolean isPointer() {
-        return isNative();
+    protected boolean isPointer(
+                    @Bind Node inliningTarget) {
+        if (PythonLanguage.get(inliningTarget).isSingleContext()) {
+            return isNative();
+        }
+        return getClosurePointerMultiContext() != -1;
     }
 
     @ExportMessage
-    protected long asPointer() {
-        return getNativePointer();
+    protected long asPointer(
+                    @Bind Node inliningTarget) throws UnsupportedMessageException {
+        if (PythonLanguage.get(inliningTarget).isSingleContext()) {
+            return getNativePointer();
+        }
+        long pointer = getClosurePointerMultiContext();
+        if (pointer == -1) {
+            throw UnsupportedMessageException.create();
+        }
+        return pointer;
+    }
+
+    @TruffleBoundary
+    private long getClosurePointerMultiContext() {
+        return PythonContext.get(null).getCApiContext().getClosurePointer(this);
     }
 
     protected abstract String getSignature();
@@ -151,9 +169,12 @@ protected long asPointer() {
     @TruffleBoundary
     protected void toNative(
                     @CachedLibrary(limit = "1") SignatureLibrary signatureLibrary) {
-        if (!isPointer()) {
+        if (!isPointer(null)) {
             CApiContext cApiContext = PythonContext.get(null).getCApiContext();
-            setNativePointer(cApiContext.registerClosure(getSignature(), this, getDelegate(), signatureLibrary));
+            long pointer = cApiContext.registerClosure(getSignature(), this, getDelegate(), signatureLibrary);
+            if (PythonLanguage.get(null).isSingleContext()) {
+                setNativePointer(pointer);
+            }
         }
     }