[heap] Harden heap-related cctests

test/cctest/heap/heap-utils.cc

-// Copyright 2015 the V8 project authors. All rights reserved.
+// 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_UTILS_H_
-#define HEAP_UTILS_H_
+#include "test/cctest/heap/heap-utils.h"
 
 #include "src/factory.h"
 #include "src/heap/heap-inl.h"
 #include "src/heap/incremental-marking.h"
 #include "src/heap/mark-compact.h"
 #include "src/isolate.h"
 
-
 namespace v8 {
 namespace internal {
+namespace heap {
 
-static int LenFromSize(int size) {
+void SealCurrentObjects(Heap* heap) {
+  heap->CollectAllGarbage();
+  heap->CollectAllGarbage();
+  heap->mark_compact_collector()->EnsureSweepingCompleted();
+  PageIterator it(heap->old_space());
+  heap->old_space()->EmptyAllocationInfo();
+  while (it.has_next()) {
+    Page* page = it.next();
+    page->MarkNeverAllocateForTesting();
+  }
+}
+
+int FixedArrayLenFromSize(int size) {
   return (size - FixedArray::kHeaderSize) / kPointerSize;
 }
 
-
-static inline std::vector<Handle<FixedArray>> CreatePadding(
-    Heap* heap, int padding_size, PretenureFlag tenure,
-    int object_size = Page::kMaxRegularHeapObjectSize) {
+std::vector<Handle<FixedArray>> CreatePadding(Heap* heap, int padding_size,
+                                              PretenureFlag tenure,
+                                              int object_size) {
   std::vector<Handle<FixedArray>> handles;
   Isolate* isolate = heap->isolate();
   int allocate_memory;
   int length;
   int free_memory = padding_size;
   if (tenure == i::TENURED) {
     heap->old_space()->EmptyAllocationInfo();
     int overall_free_memory = static_cast<int>(heap->old_space()->Available());
     CHECK(padding_size <= overall_free_memory || overall_free_memory == 0);
   } else {
     heap->new_space()->DisableInlineAllocationSteps();
     int overall_free_memory =
         static_cast<int>(*heap->new_space()->allocation_limit_address() -
                          *heap->new_space()->allocation_top_address());
     CHECK(padding_size <= overall_free_memory || overall_free_memory == 0);
   }
   while (free_memory > 0) {
     if (free_memory > object_size) {
       allocate_memory = object_size;
-      length = LenFromSize(allocate_memory);
+      length = FixedArrayLenFromSize(allocate_memory);
     } else {
       allocate_memory = free_memory;
-      length = LenFromSize(allocate_memory);
+      length = FixedArrayLenFromSize(allocate_memory);
       if (length <= 0) {
         // Not enough room to create another fixed array. Let's create a filler.
-        heap->CreateFillerObjectAt(*heap->old_space()->allocation_top_address(),
-                                   free_memory, ClearRecordedSlots::kNo);
+        if (free_memory > (2 * kPointerSize)) {
+          heap->CreateFillerObjectAt(
+              *heap->old_space()->allocation_top_address(), free_memory,
+              ClearRecordedSlots::kNo);
+        }
         break;
       }
     }
     handles.push_back(isolate->factory()->NewFixedArray(length, tenure));
     CHECK((tenure == NOT_TENURED && heap->InNewSpace(*handles.back())) ||
           (tenure == TENURED && heap->InOldSpace(*handles.back())));
     free_memory -= allocate_memory;
   }
   return handles;
 }
 
-
-// Helper function that simulates a full new-space in the heap.
-static inline bool FillUpOnePage(
-    v8::internal::NewSpace* space,
-    std::vector<Handle<FixedArray>>* out_handles = nullptr) {
-  space->DisableInlineAllocationSteps();
-  int space_remaining = static_cast<int>(*space->allocation_limit_address() -
-                                         *space->allocation_top_address());
-  if (space_remaining == 0) return false;
-  std::vector<Handle<FixedArray>> handles =
-      CreatePadding(space->heap(), space_remaining, i::NOT_TENURED);
-  if (out_handles != nullptr)
-    out_handles->insert(out_handles->end(), handles.begin(), handles.end());
-  return true;
-}
-
-
-// Helper function that simulates a fill new-space in the heap.
-static inline void AllocateAllButNBytes(
-    v8::internal::NewSpace* space, int extra_bytes,
-    std::vector<Handle<FixedArray>>* out_handles = nullptr) {
+void AllocateAllButNBytes(v8::internal::NewSpace* space, int extra_bytes,
+                          std::vector<Handle<FixedArray>>* out_handles) {
   space->DisableInlineAllocationSteps();
   int space_remaining = static_cast<int>(*space->allocation_limit_address() -
                                          *space->allocation_top_address());
   CHECK(space_remaining >= extra_bytes);
   int new_linear_size = space_remaining - extra_bytes;
   if (new_linear_size == 0) return;
   std::vector<Handle<FixedArray>> handles =
-      CreatePadding(space->heap(), new_linear_size, i::NOT_TENURED);
+      heap::CreatePadding(space->heap(), new_linear_size, i::NOT_TENURED);
   if (out_handles != nullptr)
     out_handles->insert(out_handles->end(), handles.begin(), handles.end());
 }
 
-static inline void FillCurrentPage(
-    v8::internal::NewSpace* space,
-    std::vector<Handle<FixedArray>>* out_handles = nullptr) {
-  AllocateAllButNBytes(space, 0, out_handles);
+void FillCurrentPage(v8::internal::NewSpace* space,
+                     std::vector<Handle<FixedArray>>* out_handles) {
+  heap::AllocateAllButNBytes(space, 0, out_handles);
 }
 
-static inline void SimulateFullSpace(
-    v8::internal::NewSpace* space,
-    std::vector<Handle<FixedArray>>* out_handles = nullptr) {
-  FillCurrentPage(space, out_handles);
-  while (FillUpOnePage(space, out_handles) || space->AddFreshPage()) {
+bool FillUpOnePage(v8::internal::NewSpace* space,
+                   std::vector<Handle<FixedArray>>* out_handles) {
+  space->DisableInlineAllocationSteps();
+  int space_remaining = static_cast<int>(*space->allocation_limit_address() -
+                                         *space->allocation_top_address());
+  if (space_remaining == 0) return false;
+  std::vector<Handle<FixedArray>> handles =
+      heap::CreatePadding(space->heap(), space_remaining, i::NOT_TENURED);
+  if (out_handles != nullptr)
+    out_handles->insert(out_handles->end(), handles.begin(), handles.end());
+  return true;
+}
+
+void SimulateFullSpace(v8::internal::NewSpace* space,
+                       std::vector<Handle<FixedArray>>* out_handles) {
+  heap::FillCurrentPage(space, out_handles);
+  while (heap::FillUpOnePage(space, out_handles) || space->AddFreshPage()) {
   }
 }
 
-
-// Helper function that simulates a full old-space in the heap.
-static inline void SimulateFullSpace(v8::internal::PagedSpace* space) {
-  space->EmptyAllocationInfo();
-  space->ResetFreeList();
-  space->ClearStats();
-}
-
-
-// Helper function that simulates many incremental marking steps until
-// marking is completed.
-static inline void SimulateIncrementalMarking(i::Heap* heap,
-                                              bool force_completion = true) {
+void SimulateIncrementalMarking(i::Heap* heap, bool force_completion) {
   i::MarkCompactCollector* collector = heap->mark_compact_collector();
   i::IncrementalMarking* marking = heap->incremental_marking();
   if (collector->sweeping_in_progress()) {
     collector->EnsureSweepingCompleted();
   }
   CHECK(marking->IsMarking() || marking->IsStopped());
   if (marking->IsStopped()) {
     heap->StartIncrementalMarking();
   }
   CHECK(marking->IsMarking());
   if (!force_completion) return;
 
   while (!marking->IsComplete()) {
     marking->Step(i::MB, i::IncrementalMarking::NO_GC_VIA_STACK_GUARD);
     if (marking->IsReadyToOverApproximateWeakClosure()) {
       marking->FinalizeIncrementally();
     }
   }
   CHECK(marking->IsComplete());
 }
 
+void SimulateFullSpace(v8::internal::PagedSpace* space) {
+  space->EmptyAllocationInfo();
+  space->ResetFreeList();
+  space->ClearStats();
+}
+
+}  // namespace heap
 }  // namespace internal
 }  // namespace v8
-
-#endif  // HEAP_UTILS_H_