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27
28#include "test/cctest/cctest.h"
29
30using namespace v8::internal;
31
32
33static void SetUpNewSpaceWithPoisonedMementoAtTop() {
34  Isolate* isolate = CcTest::i_isolate();
35  Heap* heap = isolate->heap();
36  NewSpace* new_space = heap->new_space();
37
38  // Make sure we can allocate some objects without causing a GC later.
39  heap->CollectAllGarbage(Heap::kAbortIncrementalMarkingMask);
40
41  // Allocate a string, the GC may suspect a memento behind the string.
42  Handle<SeqOneByteString> string =
43      isolate->factory()->NewRawOneByteString(12).ToHandleChecked();
44  CHECK(*string);
45
46  // Create an allocation memento behind the string with a garbage allocation
47  // site pointer.
48  AllocationMemento* memento =
49      reinterpret_cast<AllocationMemento*>(new_space->top() + kHeapObjectTag);
50  memento->set_map_no_write_barrier(heap->allocation_memento_map());
51  memento->set_allocation_site(
52      reinterpret_cast<AllocationSite*>(kHeapObjectTag), SKIP_WRITE_BARRIER);
53}
54
55
56TEST(Regress340063) {
57  CcTest::InitializeVM();
58  if (!i::FLAG_allocation_site_pretenuring) return;
59  v8::HandleScope scope(CcTest::isolate());
60
61
62  SetUpNewSpaceWithPoisonedMementoAtTop();
63
64  // Call GC to see if we can handle a poisonous memento right after the
65  // current new space top pointer.
66  CcTest::i_isolate()->heap()->CollectAllGarbage(
67      Heap::kAbortIncrementalMarkingMask);
68}
69
70
71TEST(BadMementoAfterTopForceScavenge) {
72  CcTest::InitializeVM();
73  if (!i::FLAG_allocation_site_pretenuring) return;
74  v8::HandleScope scope(CcTest::isolate());
75
76  SetUpNewSpaceWithPoisonedMementoAtTop();
77
78  // Force GC to test the poisoned memento handling
79  CcTest::i_isolate()->heap()->CollectGarbage(i::NEW_SPACE);
80}
81
82
83TEST(PretenuringCallNew) {
84  CcTest::InitializeVM();
85  if (!i::FLAG_allocation_site_pretenuring) return;
86  if (!i::FLAG_pretenuring_call_new) return;
87
88  v8::HandleScope scope(CcTest::isolate());
89  Isolate* isolate = CcTest::i_isolate();
90  Heap* heap = isolate->heap();
91
92  int call_count = 10;
93  i::ScopedVector<char> test_buf(1024);
94  const char* program =
95      "function f() {"
96      "  this.a = 3;"
97      "  this.b = {};"
98      "  return this;"
99      "};"
100      "var a;"
101      "for(var i = 0; i < %d; i++) {"
102      "  a = new f();"
103      "}"
104      "a;";
105  i::SNPrintF(test_buf, program, call_count);
106  v8::Local<v8::Value> res = CompileRun(test_buf.start());
107  Handle<JSObject> o =
108      v8::Utils::OpenHandle(*v8::Handle<v8::Object>::Cast(res));
109
110  // The object of class f should have a memento secreted behind it.
111  Address memento_address = o->address() + o->map()->instance_size();
112  AllocationMemento* memento =
113      reinterpret_cast<AllocationMemento*>(memento_address + kHeapObjectTag);
114  CHECK_EQ(memento->map(), heap->allocation_memento_map());
115
116  // Furthermore, how many mementos did we create? The count should match
117  // call_count. Note, that mementos are allocated during the inobject slack
118  // tracking phase.
119  AllocationSite* site = memento->GetAllocationSite();
120  CHECK_EQ(call_count, site->pretenure_create_count()->value());
121}
122