From e9f848d4453d39dcd1fda67573ce46db473454de Mon Sep 17 00:00:00 2001
From: Reece <me@reece.sx>
Date: Sat, 25 Mar 2023 23:49:14 +0000
Subject: [PATCH] [+] v8::DisableHeapGC [+] v8::EnableHeapGC (high level heap
 gc request filters, not safepoint assertions)

Last aurora commit: 65aae12e
*amended to include commit link*
---
 src/api/api.cc   | 10 ++++++++++
 src/heap/heap.cc | 16 ++++++++++++++++
 src/heap/heap.h  |  5 +++++
 3 files changed, 31 insertions(+)

diff --git a/src/api/api.cc b/src/api/api.cc
index 14eedff223..3b07a86a2b 100644
--- a/src/api/api.cc
+++ b/src/api/api.cc
@@ -1164,6 +1164,16 @@ V8_EXPORT void SafepointUnparkIsolate(v8::Isolate* pIsolate) {
   reinterpret_cast<i::Isolate*>(pIsolate)->heap()->safepoint()->NotifyUnpark();
 }
 
+// Reece:
+V8_EXPORT void DisableHeapGC(v8::Isolate* pIsolate) {
+  reinterpret_cast<i::Isolate*>(pIsolate)->heap()->is_forcing_no_gc = true;
+}
+
+// Reece:
+V8_EXPORT void EnableHeapGC(v8::Isolate* pIsolate) {
+  reinterpret_cast<i::Isolate*>(pIsolate)->heap()->is_forcing_no_gc = false;
+}
+
 void Context::Enter() {
   i::DisallowGarbageCollection no_gc;
   i::Context env = *Utils::OpenHandle(this);
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index d8c6006f4d..f58fde9e8d 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1652,6 +1652,22 @@ void Heap::CollectGarbage(AllocationSpace space,
     FatalProcessOutOfMemory("GC during deserialization");
   }
 
+  if (V8_UNLIKELY(is_forcing_no_gc)) {
+    if (!(((int)gc_callback_flags &
+               ((int)v8::GCCallbackFlags::kGCCallbackFlagForced) |
+           0))) {
+      if (gc_reason != GarbageCollectionReason::kLastResort &&
+          gc_reason != GarbageCollectionReason::kFinalizeMarkingViaTask &&
+          gc_reason != GarbageCollectionReason::kFinalizeMarkingViaStackGuard &&
+          gc_reason != GarbageCollectionReason::kFinalizeMinorMC &&
+          gc_reason != GarbageCollectionReason::kExternalFinalize &&
+          gc_reason != GarbageCollectionReason::kAllocationFailure &&
+          gc_reason != GarbageCollectionReason::kAllocationLimit) {
+        return;
+      }
+    }
+  }
+
   // CollectGarbage consists of three parts:
   // 1. The prologue part which may execute callbacks. These callbacks may
   // allocate and trigger another garbage collection.
diff --git a/src/heap/heap.h b/src/heap/heap.h
index bc8926a733..ed8d6bdba8 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -2413,6 +2413,11 @@ class Heap {
   // This field is used only when not running with MinorMC.
   ResizeNewSpaceMode resize_new_space_mode_ = ResizeNewSpaceMode::kNone;
 
+  // Reece: (another hack)
+  public:
+  bool is_forcing_no_gc = false;
+  private:
+
   // Classes in "heap" can be friends.
   friend class AlwaysAllocateScope;
   friend class ArrayBufferCollector;