From 5e55cc5a5cf3fcc0e8d1e6777e5d8f8251fd8fe5 Mon Sep 17 00:00:00 2001
From: Bert Belder <bertbelder@gmail.com>
Date: Wed, 22 Jan 2020 23:34:02 +0100
Subject: [PATCH] Add binding for Isolate::get_entered_or_microtask_context()
 (#245)

A test will be added later.
---
 src/binding.cc |  4 ++++
 src/isolate.rs | 15 +++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/src/binding.cc b/src/binding.cc
index 69371cfb..5facaf7a 100644
--- a/src/binding.cc
+++ b/src/binding.cc
@@ -114,6 +114,10 @@ v8::Context* v8__Isolate__GetCurrentContext(v8::Isolate* isolate) {
   return local_to_ptr(isolate->GetCurrentContext());
 }
 
+v8::Context* v8__Isolate__GetEnteredOrMicrotaskContext(v8::Isolate* isolate) {
+  return local_to_ptr(isolate->GetEnteredOrMicrotaskContext());
+}
+
 void v8__Isolate__SetData(v8::Isolate* isolate, uint32_t slot, void* data) {
   isolate->SetData(slot, data);
 }
diff --git a/src/isolate.rs b/src/isolate.rs
index 5bd42317..9ade32b6 100644
--- a/src/isolate.rs
+++ b/src/isolate.rs
@@ -73,6 +73,9 @@ extern "C" {
   fn v8__Isolate__Enter(this: *mut Isolate);
   fn v8__Isolate__Exit(this: *mut Isolate);
   fn v8__Isolate__GetCurrentContext(this: *mut Isolate) -> *mut Context;
+  fn v8__Isolate__GetEnteredOrMicrotaskContext(
+    this: *mut Isolate,
+  ) -> *mut Context;
   fn v8__Isolate__SetCaptureStackTraceForUncaughtExceptions(
     this: *mut Isolate,
     caputre: bool,
@@ -197,6 +200,18 @@ impl Isolate {
     unsafe { Local::from_raw(v8__Isolate__GetCurrentContext(self)).unwrap() }
   }
 
+  /// Returns either the last context entered through V8's C++ API, or the
+  /// context of the currently running microtask while processing microtasks.
+  /// If a context is entered while executing a microtask, that context is
+  /// returned.
+  pub fn get_entered_or_microtask_context<'sc>(
+    &mut self,
+  ) -> Local<'sc, Context> {
+    unsafe {
+      Local::from_raw(v8__Isolate__GetEnteredOrMicrotaskContext(self)).unwrap()
+    }
+  }
+
   /// Tells V8 to capture current stack trace when uncaught exception occurs
   /// and report it to the message listeners. The option is off by default.
   pub fn set_capture_stack_trace_for_uncaught_exceptions(