add load patches guard flag

Author: cosminbasca

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/Python3Core.java

@@ -287,6 +287,7 @@ public final class Python3Core implements PythonCore {
     private final PythonParser parser;
 
     @CompilationFinal private boolean initialized;
+    @CompilationFinal private boolean builtinsPatchesLoaded;
 
     // used in case PythonOptions.SharedCore is false
     @CompilationFinal private PythonContext singletonContext;
@@ -360,9 +361,10 @@ public void initialize() {
 
     @Override
     public void loadBuiltinsPatches() {
-        if (initialized) {
+        if (initialized && !builtinsPatchesLoaded) {
             String coreHome = PythonCore.getCoreHomeOrFail();
             loadFile(__BUILTINS_PATCHES__, coreHome);
+            builtinsPatchesLoaded = true;
         }
     }
 

graalpython/lib-graalpython/__builtins_patches__.py

@@ -0,0 +1,66 @@
+# Copyright (c) 2018, Oracle and/or its affiliates.
+#
+# 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.
+
+import sys
+import builtins
+
+# ----------------------------------------------------------------------------------------------------------------------
+#
+# patch _io
+#
+# ----------------------------------------------------------------------------------------------------------------------
+
+import _io
+import _pyio
+import io
+
+for module in [_io, io]:
+    setattr(module, 'open', _pyio.open)
+    setattr(module, 'TextIOWrapper', _pyio.TextIOWrapper)
+    setattr(module, 'IncrementalNewlineDecoder', _pyio.IncrementalNewlineDecoder)
+    setattr(module, 'BufferedRandom', _pyio.BufferedRandom)
+    setattr(module, 'BufferedRWPair', _pyio.BufferedRWPair)
+    setattr(module, 'BufferedWriter', _pyio.BufferedWriter)
+    setattr(module, 'BufferedReader', _pyio.BufferedReader)
+    setattr(module, 'StringIO', _pyio.StringIO)
+    setattr(module, '_IOBase', _pyio.IOBase)
+    setattr(module, 'RawIOBase', _pyio.RawIOBase)
+    setattr(module, 'BytesIO', _pyio.BytesIO)
+    setattr(module, '_TextIOBase', _pyio.TextIOBase)
+
+setattr(builtins, 'open', _pyio.open)
+globals()['open'] = _pyio.open