add internal and undocumented way of connecting with the java debugger

Author: timfel

graalpython/com.oracle.graal.python.shell/src/com/oracle/graal/python/shell/GraalPythonMain.java

@@ -158,6 +158,12 @@ protected List<String> preprocessArguments(List<String> givenArgs, Map<String, S
                 case "-LLI":
                     runLLI = true;
                     break;
+                case "-debug-java":
+                    if (!isAOT()) {
+                        subprocessArgs.add("Xrunjdwp:transport=dt_socket,server=y,address=8000,suspend=y");
+                        inputArgs.remove("-debug-java");
+                        break;
+                    }
                 case "-debug-perf":
                     subprocessArgs.add("Dgraal.TraceTruffleCompilation=true");
                     subprocessArgs.add("Dgraal.TraceTrufflePerformanceWarnings=true");
@@ -739,7 +745,7 @@ static List<String> getCmdline(List<String> args, List<String> subProcessDefs) {
             cmd.add("-cp");
             cmd.add(ManagementFactory.getRuntimeMXBean().getClassPath());
             for (String subProcArg : subProcessDefs) {
-                assert subProcArg.startsWith("D");
+                assert subProcArg.startsWith("D") || subProcArg.startsWith("X");
                 cmd.add("-" + subProcArg);
             }
             cmd.add(GraalPythonMain.class.getName());

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/FcntlModuleBuiltins.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2018, 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.builtins.modules;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.oracle.graal.python.builtins.CoreFunctions;
+import com.oracle.graal.python.builtins.PythonBuiltins;
+import com.oracle.graal.python.nodes.function.PythonBuiltinBaseNode;
+import com.oracle.truffle.api.dsl.NodeFactory;
+
+@CoreFunctions(defineModule = "fcntl")
+public class FcntlModuleBuiltins extends PythonBuiltins {
+    @Override
+    protected List<? extends NodeFactory<? extends PythonBuiltinBaseNode>> getNodeFactories() {
+        return new ArrayList<>();
+    }
+}