Load system env on startup.

Author: fangerer

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

@@ -368,6 +368,14 @@ public void postInitialize() {
         if (!getLanguage().isNativeBuildTime()) {
             initialized = false;
             loadFile(__BUILTINS_PATCHES__, PythonCore.getCoreHomeOrFail());
+
+            PythonModule os = lookupBuiltinModule("posix");
+            // reuse existing dict
+            Object environAttr = os.getAttribute("environ");
+            if (environAttr instanceof PDict) {
+                ((PDict) environAttr).setDictStorage(createEnvironDict().getDictStorage());
+            }
+
             initialized = true;
         }
     }
@@ -757,6 +765,16 @@ private void findKnownExceptionTypes() {
         }
     }
 
+    @TruffleBoundary
+    public PDict createEnvironDict() {
+        Map<String, String> getenv = System.getenv();
+        PDict environ = factory.createDict();
+        for (Entry<String, String> entry : getenv.entrySet()) {
+            environ.setItem(factory.createBytes(entry.getKey().getBytes()), factory.createBytes(entry.getValue().getBytes()));
+        }
+        return environ;
+    }
+
     public PythonObjectFactory factory() {
         return factory;
     }

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

@@ -56,8 +56,6 @@
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.List;
-import java.util.Map;
-import java.util.Map.Entry;
 import java.util.Random;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
@@ -70,7 +68,6 @@
 import com.oracle.graal.python.builtins.objects.PNone;
 import com.oracle.graal.python.builtins.objects.bytes.PByteArray;
 import com.oracle.graal.python.builtins.objects.bytes.PBytes;
-import com.oracle.graal.python.builtins.objects.dict.PDict;
 import com.oracle.graal.python.builtins.objects.floats.PFloat;
 import com.oracle.graal.python.builtins.objects.function.PKeyword;
 import com.oracle.graal.python.builtins.objects.ints.PInt;
@@ -251,12 +248,11 @@ public void initialize(PythonCore core) {
         super.initialize(core);
         builtinConstants.put("_have_functions", core.factory().createList());
 
-        Map<String, String> getenv = System.getenv();
-        PDict environ = core.factory().createDict();
-        for (Entry<String, String> entry : getenv.entrySet()) {
-            environ.setItem(core.factory().createBytes(entry.getKey().getBytes()), core.factory().createBytes(entry.getValue().getBytes()));
+        if (!core.getLanguage().isNativeBuildTime()) {
+            builtinConstants.put("environ", core.createEnvironDict());
+        } else {
+            builtinConstants.put("environ", core.factory().createDict());
         }
-        builtinConstants.put("environ", environ);
     }
 
     @Builtin(name = "getcwd", fixedNumOfArguments = 0)

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/runtime/PythonCore.java

@@ -30,6 +30,7 @@
 
 import com.oracle.graal.python.PythonLanguage;
 import com.oracle.graal.python.builtins.PythonBuiltinClassType;
+import com.oracle.graal.python.builtins.objects.dict.PDict;
 import com.oracle.graal.python.builtins.objects.exception.PBaseException;
 import com.oracle.graal.python.builtins.objects.module.PythonModule;
 import com.oracle.graal.python.builtins.objects.type.PythonBuiltinClass;
@@ -115,6 +116,8 @@ public interface PythonCore {
 
     public void setCurrentException(PException e);
 
+    public PDict createEnvironDict();
+
     public PythonObjectFactory factory();
 
     void setSingletonContext(PythonContext context);