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27
28 #include "test/cctest/cctest.h"
29
30 using namespace v8::internal;
31
32
SetUpNewSpaceWithPoisonedMementoAtTop()33 static 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
TEST(Regress340063)56 TEST(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
TEST(BadMementoAfterTopForceScavenge)71 TEST(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
TEST(PretenuringCallNew)83 TEST(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