[heap] Add more tasks for parallel compaction

src/heap/spaces.cc

Index: src/heap/spaces.cc
diff --git a/src/heap/spaces.cc b/src/heap/spaces.cc
index 259ee75e0d09b978c8ac6ed93ac3e18331a346fd..c565fe75093484b49c21696a9274496ba7fd4d41 100644
--- a/src/heap/spaces.cc
+++ b/src/heap/spaces.cc
@@ -2218,6 +2218,46 @@ intptr_t FreeList::Concatenate(FreeList* free_list) {
 }
 
 
+void FreeList::Divide(FreeList** free_lists, int num, intptr_t limit) {
+  CHECK(num > 0);
+  CHECK(free_lists != nullptr);
+  if (limit == 0) {
+    limit = std::numeric_limits<intptr_t>::max();
+  }
+  int size = 0;
+  int cnt = 0;
+  FreeSpace* space = nullptr;
+  while (((space = huge_list_.PickNodeFromList(&size)) != nullptr) &&
+         (free_lists[cnt % num]->available() < limit)) {
+    owner()->RemoveMemory(size);
+    free_lists[cnt % num]->huge_list_.owner()->owner()->AddExternalMemory(
+        space->address(), size);
+    cnt++;
+  }
+  while (((space = large_list_.PickNodeFromList(&size)) != nullptr) &&
+         (free_lists[cnt % num]->available() < limit)) {
+    owner()->RemoveMemory(size);
+    free_lists[cnt % num]->large_list_.owner()->owner()->AddExternalMemory(
+        space->address(), size);
+    cnt++;
+  }
+  while (((space = medium_list_.PickNodeFromList(&size)) != nullptr) &&
+         (free_lists[cnt % num]->available() < limit)) {
+    owner()->RemoveMemory(size);
+    free_lists[cnt % num]->medium_list_.owner()->owner()->AddExternalMemory(
+        space->address(), size);
+    cnt++;
+  }
+  while (((space = small_list_.PickNodeFromList(&size)) != nullptr) &&
+         (free_lists[cnt % num]->available() < limit)) {
+    owner()->RemoveMemory(size);
+    free_lists[cnt % num]->small_list_.owner()->owner()->AddExternalMemory(
+        space->address(), size);
+    cnt++;
+  }
+}
+
+
 void FreeList::Reset() {
   small_list_.Reset();
   medium_list_.Reset();