From 6bee6878ba93f578af0f2da0466a8d92ccafea56 Mon Sep 17 00:00:00 2001
From: Anna Henningsen <anna@addaleax.net>
Date: Thu, 28 Nov 2019 22:11:40 +0100
Subject: [PATCH] deps: V8: cherry-pick ca5b0ec
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Original commit message:

[heap] Ensure SyntheticModule is initialized before next allocation

Ensure that all fields of `SyntheticModule` are set before creating
the exports hash table for it, because the latter may trigger
garbage collection, leading to crashes.

This has been causing failures in the Node.js CI over the last weeks,
after making the creating of synthetic modules part of Node’s
startup sequence.

(I am generally not very familiar with this part of the V8
code and there might be a better way, or possibly a way to add a
reliable regression test, that I am not aware of.)

Refs: https://github.com/nodejs/node/issues/30498
Refs: https://github.com/nodejs/node/issues/30648
Change-Id: I32da4b7bd888c6ec1421f34f5bd52e7bad154c1e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1939752
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65247}

Refs: https://github.com/v8/v8/commit/ \
ca5b0ec2722d2af4551c01ca78921fa16a26ae72
Fixes: https://github.com/nodejs/node/issues/30498
Fixes: https://github.com/nodejs/node/issues/30648

PR-URL: https://github.com/nodejs/node/pull/30708
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
---
 common.gypi                     |  2 +-
 deps/v8/src/heap/factory.cc     | 10 ++++++----
 deps/v8/test/cctest/test-api.cc | 25 +++++++++++++++++++++++++
 3 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/common.gypi b/common.gypi
index 87a84afa4494c6..7d08d61e57982d 100644
--- a/common.gypi
+++ b/common.gypi
@@ -38,7 +38,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.23',
+    'v8_embedder_string': '-node.24',
 
     ##### V8 defaults for Node.js #####
 
diff --git a/deps/v8/src/heap/factory.cc b/deps/v8/src/heap/factory.cc
index 9bf46be6e815a1..dc3404969bc093 100644
--- a/deps/v8/src/heap/factory.cc
+++ b/deps/v8/src/heap/factory.cc
@@ -3068,20 +3068,22 @@ Handle<SyntheticModule> Factory::NewSyntheticModule(
     Handle<String> module_name, Handle<FixedArray> export_names,
     v8::Module::SyntheticModuleEvaluationSteps evaluation_steps) {
   ReadOnlyRoots roots(isolate());
-  Handle<SyntheticModule> module(
-      SyntheticModule::cast(New(synthetic_module_map(), AllocationType::kOld)),
-      isolate());
+
   Handle<ObjectHashTable> exports =
       ObjectHashTable::New(isolate(), static_cast<int>(export_names->length()));
   Handle<Foreign> evaluation_steps_foreign =
       NewForeign(reinterpret_cast<i::Address>(evaluation_steps));
-  module->set_exports(*exports);
+
+  Handle<SyntheticModule> module(
+      SyntheticModule::cast(New(synthetic_module_map(), AllocationType::kOld)),
+      isolate());
   module->set_hash(isolate()->GenerateIdentityHash(Smi::kMaxValue));
   module->set_module_namespace(roots.undefined_value());
   module->set_status(Module::kUninstantiated);
   module->set_exception(roots.the_hole_value());
   module->set_name(*module_name);
   module->set_export_names(*export_names);
+  module->set_exports(*exports);
   module->set_evaluation_steps(*evaluation_steps_foreign);
   return module;
 }
diff --git a/deps/v8/test/cctest/test-api.cc b/deps/v8/test/cctest/test-api.cc
index 25d6e41d0e91c9..bf278c7ae513ae 100644
--- a/deps/v8/test/cctest/test-api.cc
+++ b/deps/v8/test/cctest/test-api.cc
@@ -23874,6 +23874,31 @@ TEST(CreateSyntheticModule) {
   CHECK_EQ(i_module->status(), i::Module::kInstantiated);
 }
 
+TEST(CreateSyntheticModuleGC) {
+  // Try to make sure that CreateSyntheticModule() deals well with a GC
+  // happening during its execution.
+  i::FLAG_gc_interval = 10;
+  i::FLAG_inline_new = false;
+
+  LocalContext env;
+  v8::Isolate* isolate = env->GetIsolate();
+  v8::Isolate::Scope iscope(isolate);
+  v8::HandleScope scope(isolate);
+  v8::Local<v8::Context> context = v8::Context::New(isolate);
+  v8::Context::Scope cscope(context);
+
+  std::vector<v8::Local<v8::String>> export_names{v8_str("default")};
+  v8::Local<v8::String> module_name =
+      v8_str("CreateSyntheticModule-TestSyntheticModuleGC");
+
+  for (int i = 0; i < 200; i++) {
+    Local<Module> module = v8::Module::CreateSyntheticModule(
+        isolate, module_name, export_names,
+        UnexpectedSyntheticModuleEvaluationStepsCallback);
+    USE(module);
+  }
+}
+
 TEST(SyntheticModuleSetExports) {
   LocalContext env;
   v8::Isolate* isolate = env->GetIsolate();