From 93793dc45504fcc7927354c7e4f39d6de406e9d4 Mon Sep 17 00:00:00 2001
From: Simon Menke <simon.menke@gmail.com>
Date: Thu, 21 Mar 2019 14:48:19 +0100
Subject: core: Allow terminating an Isolate from another thread (#1982)

---
 libdeno/exceptions.cc | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'libdeno/exceptions.cc')

diff --git a/libdeno/exceptions.cc b/libdeno/exceptions.cc
index 51f81bfce..85f0ca340 100644
--- a/libdeno/exceptions.cc
+++ b/libdeno/exceptions.cc
@@ -174,6 +174,25 @@ std::string EncodeExceptionAsJSON(v8::Local<v8::Context> context,
 void HandleException(v8::Local<v8::Context> context,
                      v8::Local<v8::Value> exception) {
   v8::Isolate* isolate = context->GetIsolate();
+
+  // TerminateExecution was called
+  if (isolate->IsExecutionTerminating()) {
+    // cancel exception termination so that the exception can be created
+    isolate->CancelTerminateExecution();
+
+    // maybe make a new exception object
+    if (exception->IsNullOrUndefined()) {
+      exception = v8::Exception::Error(v8_str("execution terminated"));
+    }
+
+    // handle the exception as if it is a regular exception
+    HandleException(context, exception);
+
+    // re-enable exception termination
+    isolate->TerminateExecution();
+    return;
+  }
+
   DenoIsolate* d = DenoIsolate::FromIsolate(isolate);
   std::string json_str = EncodeExceptionAsJSON(context, exception);
   CHECK_NOT_NULL(d);
@@ -183,6 +202,13 @@ void HandleException(v8::Local<v8::Context> context,
 void HandleExceptionMessage(v8::Local<v8::Context> context,
                             v8::Local<v8::Message> message) {
   v8::Isolate* isolate = context->GetIsolate();
+
+  // TerminateExecution was called
+  if (isolate->IsExecutionTerminating()) {
+    HandleException(context, v8::Undefined(isolate));
+    return;
+  }
+
   DenoIsolate* d = DenoIsolate::FromIsolate(isolate);
   std::string json_str = EncodeMessageAsJSON(context, message);
   CHECK_NOT_NULL(d);
-- 
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