vm: fix displayErrors in runIn.. functions

This option has been broken for almost a year when used with any of the
vm.runIn.. family of functions, except for syntax errors.

PR-URL: https://github.com/nodejs/node/pull/13074
Reviewed-By: Anna Henningsen <anna@addaleax.net>

lib/repl.js

@@ -231,7 +231,7 @@ function REPLServer(prompt,
       try {
         try {
           const scriptOptions = {
-            displayErrors: true,
+            displayErrors: false,
             breakOnSigint: self.breakEvalOnSigint
           };
 

src/node_contextify.cc

@@ -736,7 +736,9 @@ class ContextifyScript : public BaseObject {
       return;
     }
 
-    Local<String> decorated_stack = String::Concat(arrow.As<String>(),
+    Local<String> decorated_stack = String::Concat(
+        String::Concat(arrow.As<String>(),
+          FIXED_ONE_BYTE_STRING(env->isolate(), "\n")),
         stack.As<String>());
     err_obj->Set(env->stack_string(), decorated_stack);
     err_obj->SetPrivate(
@@ -984,6 +986,9 @@ class ContextifyScript : public BaseObject {
         env->ThrowError("Script execution timed out.");
       } else if (received_signal) {
         env->ThrowError("Script execution interrupted.");
+      } else if (display_errors) {
+        // We should decorate non-termination exceptions
+        DecorateErrorStack(env, *try_catch);
       }
 
       // If there was an exception thrown during script execution, re-throw it.
@@ -996,15 +1001,6 @@ class ContextifyScript : public BaseObject {
       return false;
     }
 
-    if (result.IsEmpty()) {
-      // Error occurred during execution of the script.
-      if (display_errors) {
-        DecorateErrorStack(env, *try_catch);
-      }
-      try_catch->ReThrow();
-      return false;
-    }
-
     args.GetReturnValue().Set(result);
     return true;
   }

test/message/vm_display_runtime_error.js

@@ -25,6 +25,12 @@ const vm = require('vm');
 
 console.error('beginning');
 
+try {
   vm.runInThisContext('throw new Error("boo!")', { filename: 'test.vm'});
+} catch (err) {
+  console.error(err.stack);
+}
+
+vm.runInThisContext('throw new Error("spooky!")', { filename: 'test.vm' });
 
 console.error('end');

test/message/vm_display_runtime_error.out

@@ -14,3 +14,18 @@ Error: boo!
     at tryModuleLoad (module.js:*:*)
     at Function.Module._load (module.js:*)
     at Function.Module.runMain (module.js:*)
+test.vm:1
+throw new Error("spooky!")
+^
+
+Error: spooky!
+    at test.vm:1:7
+    at ContextifyScript.Script.runInThisContext (vm.js:*)
+    at Object.runInThisContext (vm.js:*)
+    at Object.<anonymous> (*test*message*vm_display_runtime_error.js:*)
+    at Module._compile (module.js:*)
+    at Object.Module._extensions..js (module.js:*)
+    at Module.load (module.js:*)
+    at tryModuleLoad (module.js:*:*)
+    at Function.Module._load (module.js:*)
+    at Function.Module.runMain (module.js:*)