Avoid StackOverflow when comparing unknown foreign objects (#7780)

Closes #7677 by eliminating the _stackoverflow execption_. In general it seems _too adventurous_ to walk members of random foreign objects. There can be anything including cycles. Rather than trying to be too smart in these cases, let's just rely on `InteropLibrary.isIdentical` message.

# Important Notes
Calling `sort` on the `numpy` array no longer yields an error, but the array isn't sorted - that needs a fix on the Python side: oracle/graalpython#354 - once it is in, the elements will be treated as numbers and the sorting happens automatically (without any changes in Enso code).

engine/runtime/src/main/java/org/enso/interpreter/node/expression/builtin/meta/EqualsComplexNode.java

@@ -370,50 +370,10 @@ boolean equalsInteropObjectWithMembers(
       @Shared("typesLib") @CachedLibrary(limit = "10") TypesLibrary typesLib,
       @Shared("equalsNode") @Cached EqualsNode equalsNode,
       @Shared("hostValueToEnsoNode") @Cached HostValueToEnsoNode valueToEnsoNode) {
-    try {
-      Object selfMembers = interop.getMembers(selfObject);
-      Object otherMembers = interop.getMembers(otherObject);
-      assert interop.getArraySize(selfMembers) < Integer.MAX_VALUE
-          : "Long array sizes not supported";
-      int membersSize = (int) interop.getArraySize(selfMembers);
-      if (interop.getArraySize(otherMembers) != membersSize) {
-        return false;
-      }
-
-      // Check member names
-      String[] memberNames = new String[membersSize];
-      for (int i = 0; i < membersSize; i++) {
-        String selfMemberName = interop.asString(interop.readArrayElement(selfMembers, i));
-        String otherMemberName = interop.asString(interop.readArrayElement(otherMembers, i));
-        if (!equalsNode.execute(selfMemberName, otherMemberName)) {
-          return false;
-        }
-        memberNames[i] = selfMemberName;
-      }
-
-      // Check member values
-      for (int i = 0; i < membersSize; i++) {
-        if (interop.isMemberReadable(selfObject, memberNames[i])
-            && interop.isMemberReadable(otherObject, memberNames[i])) {
-          Object selfMember =
-              valueToEnsoNode.execute(interop.readMember(selfObject, memberNames[i]));
-          Object otherMember =
-              valueToEnsoNode.execute(interop.readMember(otherObject, memberNames[i]));
-          if (!equalsNode.execute(selfMember, otherMember)) {
-            return false;
-          }
-        }
-      }
+    if (interop.isIdentical(selfObject, otherObject, interop)) {
       return true;
-    } catch (UnsupportedMessageException
-        | InvalidArrayIndexException
-        | UnknownIdentifierException e) {
-      throw new IllegalStateException(
-          String.format(
-              "One of the interop objects has probably wrongly specified interop API "
-                  + "for members. selfObject = %s ; otherObject = %s",
-              selfObject, otherObject),
-          e);
+    } else {
+      return false;
     }
   }
 
@@ -549,6 +509,9 @@ boolean isObjectWithMembers(Object object, InteropLibrary interop) {
     if (interop.isTime(object)) {
       return false;
     }
+    if (interop.hasHashEntries(object)) {
+      return false;
+    }
     return interop.hasMembers(object);
   }
 

test/Examples_Tests/src/Python_Examples_Spec.enso

@@ -49,11 +49,16 @@ spec = Test.group "Python Examples" <|
             main = dir/"src"/"Main.enso"
             main.exists . should_be_true
             code = """
+                from Standard.Base import all
+
                 foreign python random_array s = """
                     import numpy
                     return numpy.random.normal(size=s)
 
-                main = random_array 10
+                main =
+                    arr = random_array 10
+                    vec = arr.to_vector.sort
+                    [ arr, vec ]
 
             code . write main on_existing_file=Existing_File_Behavior.Overwrite
 

test/Tests/polyglot-sources/enso-test-java-helpers/src/main/java/org/enso/base_test_helpers/IntHolderEquals.java

@@ -0,0 +1,22 @@
+package org.enso.base_test_helpers;
+
+public final class IntHolderEquals {
+  public final int value;
+  public final Integer boxed;
+
+  public IntHolderEquals(int value) {
+    this.value = value;
+    this.boxed = value;
+  }
+
+  public int hashCode() {
+    return value;
+  }
+
+  public boolean equals(Object obj) {
+    if (obj instanceof IntHolderEquals other) {
+      return value == other.value;
+    }
+    return false;
+  }
+}

test/Tests/src/Data/Vector_Spec.enso

@@ -760,13 +760,13 @@ type_spec name alter = Test.group name <|
         alter [T.Value 1 2, T.Value 3 3, T.Value 1 2] . distinct . should_equal [T.Value 1 2, T.Value 3 3]
         alter [T.Value 1 2, T.Value 3 3, T.Value 1 2, Nothing] . distinct . should_equal [T.Value 1 2, T.Value 3 3, Nothing]
         alter [Nothing, T.Value 1 2, T.Value 3 3, T.Value 1 2, Nothing] . distinct . should_equal [Nothing, T.Value 1 2, T.Value 3 3]
-        alter [T.Value 1 2, Date.new hours=3] . distinct . should_equal [T.Value 1 2, Date.new hours=3]
+        alter [T.Value 1 2, Date.new year=1973] . distinct . should_equal [T.Value 1 2, Date.new year=1973]
 
     Test.specify "should return a vector containing only unique elements up to some criteria" <|
         alter [Pair.new 1 "a", Pair.new 2 "b", Pair.new 1 "c"] . distinct (on = _.first) . should_equal [Pair.new 1 "a", Pair.new 2 "b"]
 
     Test.specify "should be able to sort a heterogenous vector" <|
-        arr = [ 1, 1.3, "hi", Date.today, Date_Time.now, [ 0 ] ]
+        arr = alter [ 1, 1.3, "hi", Date.today, Date_Time.now, [ 0 ] ]
         (arr.sort on=(.to_text) . map .to_text) . should_equal (arr.map .to_text . sort)
         (arr.sort on=(_.to_text) . map .to_text) . should_equal (arr.map .to_text . sort)
         (arr.sort on=(x-> x.to_text) . map .to_text) . should_equal (arr.map .to_text . sort)

test/Tests/src/Semantic/Equals_Spec.enso

@@ -3,8 +3,11 @@ from Standard.Base import all
 from Standard.Test import Test, Test_Suite
 import Standard.Test.Extensions
 
-polyglot java import java.nio.file.Path as JavaPath
+polyglot java import java.math.BigInteger as Java_Big_Integer
+polyglot java import java.nio.file.Path as Java_Path
 polyglot java import java.util.Random as Java_Random
+polyglot java import org.enso.base_test_helpers.IntHolder
+polyglot java import org.enso.base_test_helpers.IntHolderEquals
 
 type CustomEqType
     C1 f1
@@ -110,6 +113,24 @@ foreign js js_true = """
 foreign js js_text_foo = """
     return 'foo'
 
+foreign js js_json a b = """
+    return JSON.parse(`
+    {
+        "a" : ${a},
+        "b" : ${b}
+    }`);
+
+foreign js js_map a b = """
+    var m = new Map()
+    m.set("a", a)
+    m.set("b", b);
+    return m
+
+foreign js js_obj a b = """
+    var m = {};
+    m.a = a;
+    m.b = b;
+    return m;
 
 spec =
     Test.group "Operator ==" <|
@@ -158,8 +179,8 @@ spec =
             ((CustomEqType.C1 0) == (CustomEqType.C2 7 3)).should_be_false
 
         Test.specify "should dispatch to equals on host values" <|
-            path1 = JavaPath.of "home" "user" . resolve "file.txt"
-            path2 = JavaPath.of "home" "user" "file.txt"
+            path1 = Java_Path.of "home" "user" . resolve "file.txt"
+            path2 = Java_Path.of "home" "user" "file.txt"
             (path1 == path2).should_be_true
             path3 = path1.resolve "subfile.txt"
             (path3 == path2).should_be_false
@@ -203,5 +224,59 @@ spec =
                 dupl_tree = tree.deep_copy
                 Test.with_clue "Seed sed to 42" (tree == dupl_tree).should_be_true
 
+        Test.specify "partially applied constructors aren't == " <|
+            f1 = CustomEqType.C2 10
+            f2 = CustomEqType.C2 10
+            f1==f2 . should_be_false
+
+    Test.group "Polyglot Operator ==" <|
+        Test.specify "should not try to compare members" <|
+            x = IntHolder.new 5
+            y = IntHolder.new 5
+            z = IntHolder.new 3
+            x==z . should_be_false
+            x==y . should_be_false
+            y==y . should_be_true
+            x==x . should_be_true
+            z==z . should_be_true
+
+        Test.specify "should not try to compare members in JS object" <|
+            x = js_obj 5 3
+            y = js_obj 5 3
+            z = js_obj 3 5
+            x==z . should_be_false
+            x==y . should_be_false
+            y==y . should_be_true
+            x==x . should_be_true
+            z==z . should_be_true
+
+        Test.specify "should invoke equals" <|
+            x = IntHolderEquals.new 5
+            y = IntHolderEquals.new 5
+            z = IntHolderEquals.new 3
+            x==z . should_be_false
+            x==y . should_be_true
+            y==y . should_be_true
+            x==x . should_be_true
+            z==z . should_be_true
+
+        Test.specify "should compare big integer" <|
+            x = Java_Big_Integer.new "54024430107564432"
+            y = Java_Big_Integer.new "54024430107564432"
+            x==y . should_be_true
+
+        Test.specify "JSON is found different" <|
+            x = js_json 10 5
+            y = js_json 10 5
+            x==y . should_be_false
+
+        Test.specify "Identical JSON is found equal" <|
+            x = js_json 10 5
+            x==x . should_be_true
+
+        Test.specify "JavaScript Map is found same" <|
+            x = js_map 10 5
+            y = js_map 10 5
+            x==y . should_be_true
 
 main = Test_Suite.run_main spec