From c820e7393c5f68696f489d08d43549e9884f1c42 Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Fri, 7 Jun 2019 18:06:07 -0400
Subject: [PATCH] WIP segfault

---
 core/isolate.rs         | 26 ++++++++++++++++++--------
 core/libdeno/binding.cc | 14 +++++++++++---
 core/libdeno/modules.cc |  8 ++++++++
 3 files changed, 37 insertions(+), 11 deletions(-)

diff --git a/core/isolate.rs b/core/isolate.rs
index c9b281a618703a..02ce8c67603368 100644
--- a/core/isolate.rs
+++ b/core/isolate.rs
@@ -217,11 +217,16 @@ impl Isolate {
     referrer: *const c_char,
     id: deno_dyn_import_id,
   ) {
+    let isolate = unsafe { Isolate::from_raw_ptr(user_data) };
+    println!(
+      "isolate.config.dyn_import {}",
+      isolate.config.dyn_import.is_some()
+    );
+
     let specifier = unsafe { CStr::from_ptr(specifier).to_str().unwrap() };
     let referrer = unsafe { CStr::from_ptr(referrer).to_str().unwrap() };
-    debug!("dyn_import specifier {} referrer {} ", specifier, referrer);
+    println!("dyn_import specifier {} referrer {} ", specifier, referrer);
 
-    let isolate = unsafe { Isolate::from_raw_ptr(user_data) };
     if let Some(ref f) = isolate.config.dyn_import {
       let inner = f(specifier, referrer);
       let fut = DynImport { inner, id };
@@ -511,7 +516,7 @@ impl Future for Isolate {
 
     loop {
       // If there are any pending dyn_import futures, do those first.
-      if !self.pending_dyn_imports.is_empty(){
+      if !self.pending_dyn_imports.is_empty() {
         match self.pending_dyn_imports.poll() {
           Err(()) => panic!("unexpected dyn_import error"),
           Ok(Ready(None)) => break,
@@ -921,16 +926,16 @@ pub mod tests {
       let mod_b2 = mod_b.clone();
 
       let mut config = Config::default();
-      config.dyn_import(move |specifier, referrer| {
+      config.dyn_import(move |_specifier, referrer| {
         count_.fetch_add(1, Ordering::Relaxed);
-        assert_eq!(specifier, "foo.js");
+        // assert_eq!(specifier, "foo.js");
         assert_eq!(referrer, "dyn_import3.js");
         let mod_id = mod_b2.lock().unwrap();
-        println!("dyn_import callback mod_id = {}", *mod_id);
         Box::new(futures::future::ok(*mod_id))
       });
 
       let mut isolate = Isolate::new(StartupData::None, config);
+
       // Instantiate mod_b
       {
         let mut mod_id = mod_b.lock().unwrap();
@@ -947,9 +952,14 @@ pub mod tests {
         "dyn_import3.js",
         r#"
         (async () => {
-          let mod = await import("foo.js");
+          let mod = await import("foo1.js");
+          if (mod.b() !== 'b') {
+            throw Error("bad1");
+          }
+          // And again!
+          mod = await import("foo2.js");
           if (mod.b() !== 'b') {
-            throw Error("bad");
+            throw Error("bad2");
           }
         })();
         "#,
diff --git a/core/libdeno/binding.cc b/core/libdeno/binding.cc
index 4aeb6003afcd3f..7d91b088d23617 100644
--- a/core/libdeno/binding.cc
+++ b/core/libdeno/binding.cc
@@ -515,6 +515,8 @@ v8::MaybeLocal<v8::Promise> HostImportModuleDynamicallyCallback(
   auto* isolate = context->GetIsolate();
   DenoIsolate* d = DenoIsolate::FromIsolate(isolate);
   v8::Isolate::Scope isolate_scope(isolate);
+  v8::Context::Scope context_scope(context);
+  v8::EscapableHandleScope handle_scope(isolate);
 
   v8::String::Utf8Value specifier_str(isolate, specifier);
 
@@ -536,9 +538,15 @@ v8::MaybeLocal<v8::Promise> HostImportModuleDynamicallyCallback(
                              std::make_tuple(import_id),
                              std::make_tuple(d->isolate_, resolver));
 
-  d->dyn_import_cb_(d->user_data_, *specifier_str, *referrer_name_str,
-                    import_id);
-  return resolver->GetPromise();
+  printf("BEFORE dyn_import_cb_ %s \n", *specifier_str);
+  {
+    // deno::UserDataScope user_data_scope(d, d->user_data_);
+    d->dyn_import_cb_(d->user_data_, *specifier_str, *referrer_name_str,
+                      import_id);
+  }
+  printf("AFTER dyn_import_cb_ %s \n", *specifier_str);
+  auto promise = resolver->GetPromise();
+  return handle_scope.Escape(promise);
 }
 
 void DenoIsolate::AddIsolate(v8::Isolate* isolate) {
diff --git a/core/libdeno/modules.cc b/core/libdeno/modules.cc
index 2a89ae8fbb2cdc..26edc43078b0f0 100644
--- a/core/libdeno/modules.cc
+++ b/core/libdeno/modules.cc
@@ -153,6 +153,8 @@ void deno_mod_evaluate(Deno* d_, void* user_data, deno_mod id) {
 
 void deno_dyn_import(Deno* d_, deno_dyn_import_id import_id, deno_mod mod_id) {
   auto* d = unwrap(d_);
+  // deno::UserDataScope user_data_scope(d, user_data);
+
   auto* isolate = d->isolate_;
   v8::Isolate::Scope isolate_scope(isolate);
   v8::Locker locker(isolate);
@@ -160,6 +162,8 @@ void deno_dyn_import(Deno* d_, deno_dyn_import_id import_id, deno_mod mod_id) {
   auto context = d->context_.Get(d->isolate_);
   v8::Context::Scope context_scope(context);
 
+  v8::TryCatch try_catch(isolate);
+
   auto it = d->dyn_import_map_.find(import_id);
   if (it == d->dyn_import_map_.end()) {
     CHECK(false);  // TODO(ry) error on bad import_id.
@@ -184,6 +188,10 @@ void deno_dyn_import(Deno* d_, deno_dyn_import_id import_id, deno_mod mod_id) {
 
   persistent_promise->Reset();
   d->dyn_import_map_.erase(it);
+
+  if (try_catch.HasCaught()) {
+    HandleException(context, try_catch.Exception());
+  }
 }
 
 }  // extern "C"