don't create PJSONScanner/PJSONEncoder on fast path

Author: lukasstadler

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/json/JSONModuleBuiltins.java

@@ -278,6 +278,7 @@ protected ArgumentClinicProvider getArgumentClinic() {
         }
 
         @Specialization
+        @TruffleBoundary
         protected PJSONEncoder doNew(Object cls, Object markers, Object defaultFn, Object encoder, Object indent, String keySeparator, String itemSeparator, boolean sortKeys, boolean skipKeys,
                         boolean allowNan,
                         @Cached PythonObjectFactory factory) {

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/json/PJSONEncoder.java

@@ -43,6 +43,7 @@
 import java.util.IdentityHashMap;
 
 import com.oracle.graal.python.builtins.objects.object.PythonBuiltinObject;
+import com.oracle.truffle.api.CompilerAsserts;
 import com.oracle.truffle.api.object.Shape;
 
 public final class PJSONEncoder extends PythonBuiltinObject {
@@ -69,6 +70,7 @@ public enum FastEncode {
     public PJSONEncoder(Object cls, Shape instanceShape, Object markers, Object defaultFn, Object encoder, Object indent, String keySeparator, String itemSeparator, boolean sortKeys, boolean skipKeys,
                     boolean allowNan, FastEncode fastEncode) {
         super(cls, instanceShape);
+        CompilerAsserts.neverPartOfCompilation();
         this.markers = markers;
         this.defaultFn = defaultFn;
         this.encoder = encoder;

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/json/PJSONScanner.java

@@ -43,6 +43,7 @@
 import java.util.HashMap;
 
 import com.oracle.graal.python.builtins.objects.object.PythonBuiltinObject;
+import com.oracle.truffle.api.CompilerAsserts;
 import com.oracle.truffle.api.object.Shape;
 
 public final class PJSONScanner extends PythonBuiltinObject {
@@ -57,6 +58,7 @@ public final class PJSONScanner extends PythonBuiltinObject {
 
     public PJSONScanner(Object cls, Shape instanceShape, boolean strict, Object objectHook, Object objectPairsHook, Object parseFloat, Object parseInt, Object parseConstant) {
         super(cls, instanceShape);
+        CompilerAsserts.neverPartOfCompilation();
         this.memo = new HashMap<>();
         this.strict = strict;
         this.objectHook = objectHook;

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/runtime/object/PythonObjectFactory.java

@@ -163,6 +163,7 @@
 import com.oracle.graal.python.util.OverflowException;
 import com.oracle.graal.python.util.PythonUtils;
 import com.oracle.truffle.api.Assumption;
+import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
 import com.oracle.truffle.api.RootCallTarget;
 import com.oracle.truffle.api.TruffleLanguage.ContextReference;
 import com.oracle.truffle.api.dsl.Cached;
@@ -1096,11 +1097,14 @@ public final PProperty createProperty(Object cls) {
     }
 
     // JSON
+    // (not created on fast path, thus TruffleBoundary)
 
+    @TruffleBoundary
     public final PJSONScanner createJSONScanner(Object clazz, boolean strict, Object objectHook, Object objectPairsHook, Object parseFloat, Object parseInt, Object parseConstant) {
         return trace(new PJSONScanner(clazz, getShape(clazz), strict, objectHook, objectPairsHook, parseFloat, parseInt, parseConstant));
     }
 
+    @TruffleBoundary
     public final PJSONEncoder createJSONEncoder(Object clazz, Object markers, Object defaultFn, Object encoder, Object indent, String keySeparator, String itemSeparator, boolean sortKeys,
                     boolean skipKeys, boolean allowNan, FastEncode fastEncode) {
         return trace(new PJSONEncoder(clazz, getShape(clazz), markers, defaultFn, encoder, indent, keySeparator, itemSeparator, sortKeys, skipKeys, allowNan, fastEncode));