[heap] Fix page promotions tests

test/cctest/heap/test-page-promotion.cc

Index: test/cctest/heap/test-page-promotion.cc
diff --git a/test/cctest/heap/test-page-promotion.cc b/test/cctest/heap/test-page-promotion.cc
index 23dccd165cf6c690b6f1437b56d7c4d040977af3..17096bc7ca6bf982a6f11cc9c19df679d16a2f93 100644
--- a/test/cctest/heap/test-page-promotion.cc
+++ b/test/cctest/heap/test-page-promotion.cc
@@ -57,23 +57,26 @@ UNINITIALIZED_TEST(PagePromotion_NewToOld) {
     heap::SimulateFullSpace(heap->new_space(), &handles);
     heap->CollectGarbage(NEW_SPACE, i::GarbageCollectionReason::kTesting);
     CHECK_GT(handles.size(), 0u);
-    // First object in handle should be on the first page.
-    Handle<FixedArray> first_object = handles.front();
-    Page* first_page = Page::FromAddress(first_object->address());
+    // Last object in handles should definitely be on a page that does not
+    // contain the age mark, thus qualifying for moving.
+    Handle<FixedArray> last_object = handles.back();
+    Page* to_be_promoted_page = Page::FromAddress(last_object->address());
+    CHECK(!to_be_promoted_page->Contains(heap->new_space()->age_mark()));
     // To perform a sanity check on live bytes we need to mark the heap.
     heap::SimulateIncrementalMarking(heap, true);
     // Sanity check that the page meets the requirements for promotion.
     const int threshold_bytes =
         FLAG_page_promotion_threshold * Page::kAllocatableMemory / 100;
-    CHECK_GE(MarkingState::Internal(first_page).live_bytes(), threshold_bytes);
+    CHECK_GE(MarkingState::Internal(to_be_promoted_page).live_bytes(),
+             threshold_bytes);
 
     // Actual checks: The page is in new space first, but is moved to old space
     // during a full GC.
-    CHECK(heap->new_space()->ContainsSlow(first_page->address()));
-    CHECK(!heap->old_space()->ContainsSlow(first_page->address()));
+    CHECK(heap->new_space()->ContainsSlow(to_be_promoted_page->address()));
+    CHECK(!heap->old_space()->ContainsSlow(to_be_promoted_page->address()));
     heap::GcAndSweep(heap, OLD_SPACE);
-    CHECK(!heap->new_space()->ContainsSlow(first_page->address()));
-    CHECK(heap->old_space()->ContainsSlow(first_page->address()));
+    CHECK(!heap->new_space()->ContainsSlow(to_be_promoted_page->address()));
+    CHECK(heap->old_space()->ContainsSlow(to_be_promoted_page->address()));
   }
 }
 
@@ -91,10 +94,11 @@ UNINITIALIZED_TEST(PagePromotion_NewToNew) {
     std::vector<Handle<FixedArray>> handles;
     heap::SimulateFullSpace(heap->new_space(), &handles);
     CHECK_GT(handles.size(), 0u);
-    // Last object in handles should definitely be on the last page which does
-    // not contain the age mark.
+    // Last object in handles should definitely be on a page that does not
+    // contain the age mark, thus qualifying for moving.
     Handle<FixedArray> last_object = handles.back();
     Page* to_be_promoted_page = Page::FromAddress(last_object->address());
+    CHECK(!to_be_promoted_page->Contains(heap->new_space()->age_mark()));
     CHECK(to_be_promoted_page->Contains(last_object->address()));
     CHECK(heap->new_space()->ToSpaceContainsSlow(last_object->address()));
     heap::GcAndSweep(heap, OLD_SPACE);
@@ -126,10 +130,11 @@ UNINITIALIZED_TEST(PagePromotion_NewToNewJSArrayBuffer) {
     // Simulate a full space, filling the interesting page with live objects.
     heap::SimulateFullSpace(heap->new_space(), &handles);
     CHECK_GT(handles.size(), 0u);
-    // Last object in handles should definitely be on the last page which does
-    // not contain the age mark.
+    // First object in handles should be on the same page as the allocated
+    // JSArrayBuffer.
     Handle<FixedArray> first_object = handles.front();
     Page* to_be_promoted_page = Page::FromAddress(first_object->address());
+    CHECK(!to_be_promoted_page->Contains(heap->new_space()->age_mark()));
     CHECK(to_be_promoted_page->Contains(first_object->address()));
     CHECK(to_be_promoted_page->Contains(buffer->address()));
     CHECK(heap->new_space()->ToSpaceContainsSlow(first_object->address()));
@@ -160,10 +165,11 @@ UNINITIALIZED_HEAP_TEST(Regress658718) {
       std::vector<Handle<FixedArray>> handles;
       heap::SimulateFullSpace(heap->new_space(), &handles);
       CHECK_GT(handles.size(), 0u);
-      // Last object in handles should definitely be on the last page which does
-      // not contain the age mark.
+      // Last object in handles should definitely be on a page that does not
+      // contain the age mark, thus qualifying for moving.
       Handle<FixedArray> last_object = handles.back();
       Page* to_be_promoted_page = Page::FromAddress(last_object->address());
+      CHECK(!to_be_promoted_page->Contains(heap->new_space()->age_mark()));
       CHECK(to_be_promoted_page->Contains(last_object->address()));
       CHECK(heap->new_space()->ToSpaceContainsSlow(last_object->address()));
       heap->CollectGarbage(OLD_SPACE, i::GarbageCollectionReason::kTesting);