add PyConvertOptionalToSizeNode

Author: cosminbasca

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/lib/PyConvertOptionalToSizeNode.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * The Universal Permissive License (UPL), Version 1.0
+ *
+ * Subject to the condition set forth below, permission is hereby granted to any
+ * person obtaining a copy of this software, associated documentation and/or
+ * data (collectively the "Software"), free of charge and under any and all
+ * copyright rights in the Software, and any and all patent rights owned or
+ * freely licensable by each licensor hereunder covering either (i) the
+ * unmodified Software as contributed to or provided by such licensor, or (ii)
+ * the Larger Works (as defined below), to deal in both
+ *
+ * (a) the Software, and
+ *
+ * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
+ * one is included with the Software each a "Larger Work" to which the Software
+ * is contributed by such licensors),
+ *
+ * without restriction, including without limitation the rights to copy, create
+ * derivative works of, display, perform, and distribute the Software and make,
+ * use, sell, offer for sale, import, export, have made, and have sold the
+ * Software and the Larger Work(s), and to sublicense the foregoing rights on
+ * either these or other terms.
+ *
+ * This license is subject to the following condition:
+ *
+ * The above copyright notice and either this complete permission notice or at a
+ * minimum a reference to the UPL must be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.oracle.graal.python.lib;
+
+import com.oracle.graal.python.builtins.objects.PNone;
+import com.oracle.graal.python.nodes.ErrorMessages;
+import com.oracle.graal.python.nodes.PNodeWithContext;
+import com.oracle.graal.python.nodes.PRaiseNode;
+import com.oracle.graal.python.runtime.exception.PythonErrorType;
+import com.oracle.truffle.api.dsl.Cached;
+import com.oracle.truffle.api.dsl.GenerateUncached;
+import com.oracle.truffle.api.dsl.Specialization;
+import com.oracle.truffle.api.frame.Frame;
+import com.oracle.truffle.api.frame.VirtualFrame;
+
+/**
+ * Equivalent of CPython's {@code _Py_convert_optional_to_ssize_t} function.
+ * If value is {@code None}, {@code defaultValue} is returned.
+ */
+@GenerateUncached
+public abstract class PyConvertOptionalToSizeNode extends PNodeWithContext {
+    public abstract int execute(Frame frame, Object object, int defaultValue);
+
+    @Specialization(guards = "isNone(value)")
+    int doOptional(VirtualFrame frame, @SuppressWarnings("unused") PNone value, int defaultValue) {
+        return defaultValue;
+    }
+
+    @Specialization(guards = {"!isNone(value)", "!isNoValue(value)"})
+    int doObject(VirtualFrame frame, Object value, @SuppressWarnings("unused") int defaultValue,
+                    @Cached PRaiseNode raiseNode,
+                    @Cached PyIndexCheckNode indexCheckNode,
+                    @Cached PyNumberAsSizeNode asSizeNode) {
+        int limit;
+        if (indexCheckNode.execute(value)) {
+            limit = asSizeNode.executeExact(frame, value);
+        } else {
+            throw raiseNode.raise(PythonErrorType.TypeError, ErrorMessages.ARG_SHOULD_BE_INT_OR_NONE, value);
+        }
+        return limit;
+    }
+}