[heap] Harden heap-related cctests

test/cctest/heap/heap-utils.h

+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef HEAP_HEAP_UTILS_H_
+#define HEAP_HEAP_UTILS_H_
+
+#include "src/heap/heap.h"
+
+namespace v8 {
+namespace internal {
+namespace heap {
+
+void SealCurrentObjects(Heap* heap);
+
+int FixedArrayLenFromSize(int size);
+
+std::vector<Handle<FixedArray>> CreatePadding(
+    Heap* heap, int padding_size, PretenureFlag tenure,
+    int object_size = Page::kMaxRegularHeapObjectSize);
+
+void AllocateAllButNBytes(
+    v8::internal::NewSpace* space, int extra_bytes,
+    std::vector<Handle<FixedArray>>* out_handles = nullptr);
+
+void FillCurrentPage(v8::internal::NewSpace* space,
+                     std::vector<Handle<FixedArray>>* out_handles = nullptr);
+
+// Helper function that simulates a full new-space in the heap.
+bool FillUpOnePage(v8::internal::NewSpace* space,
+                   std::vector<Handle<FixedArray>>* out_handles = nullptr);
+
+void SimulateFullSpace(v8::internal::NewSpace* space,
+                       std::vector<Handle<FixedArray>>* out_handles = nullptr);
+
+// Helper function that simulates many incremental marking steps until
+// marking is completed.
+void SimulateIncrementalMarking(i::Heap* heap, bool force_completion = true);
+
+// Helper function that simulates a full old-space in the heap.
+void SimulateFullSpace(v8::internal::PagedSpace* space);
+
+}  // namespace heap
+}  // namespace internal
+}  // namespace v8
+
+#endif  // HEAP_HEAP_UTILS_H_