Command line option for disabling forced splits.

Author: boris-spas

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/call/InvokeNode.java

@@ -214,7 +214,7 @@ public abstract class InvokeNode extends AbstractInvokeNode {
 
     protected InvokeNode(CallTarget callTarget, Arity calleeArity, PythonObject globals, PCell[] closure, boolean isBuiltin, boolean isGenerator) {
         this.callNode = Truffle.getRuntime().createDirectCallNode(callTarget);
-        if (isBuiltin) {
+        if (isBuiltin && PythonOptions.getEnableForcedSplits()) {
             callNode.cloneCallTarget();
         }
         if (isGenerator && shouldInlineGenerators()) {

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

@@ -116,6 +116,9 @@ private PythonOptions() {
     @Option(category = OptionCategory.DEBUG, help = "Minimal size of string, when lazy strings are used. Default 20") //
     public static final OptionKey<Integer> MinLazyStringLength = new OptionKey<>(20);
 
+    @Option(category = OptionCategory.EXPERT, help = "Enable forced splitting (of builtins). Default true.") //
+    public static final OptionKey<Boolean> EnableForcedSplits = new OptionKey<>(true);
+
     public static OptionDescriptors createDescriptors() {
         return new PythonOptionsOptionDescriptors();
     }
@@ -163,4 +166,8 @@ public static int getMinLazyStringLength() {
     public static boolean isWithThread() {
         return getOption(PythonLanguage.getContextRef().get(), WithThread);
     }
+
+    public static boolean getEnableForcedSplits() {
+        return getOption(PythonLanguage.getContextRef().get(), EnableForcedSplits);
+    }
 }