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// Copyright 2014 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "test/cctest/cctest.h"
using namespace v8::internal;
static void SetUpNewSpaceWithPoisonedMementoAtTop() {
Isolate* isolate = CcTest::i_isolate();
Heap* heap = isolate->heap();
NewSpace* new_space = heap->new_space();
// Make sure we can allocate some objects without causing a GC later.
heap->CollectAllGarbage(Heap::kAbortIncrementalMarkingMask);
// Allocate a string, the GC may suspect a memento behind the string.
Handle<SeqOneByteString> string =
isolate->factory()->NewRawOneByteString(12).ToHandleChecked();
CHECK(*string);
// Create an allocation memento behind the string with a garbage allocation
// site pointer.
AllocationMemento* memento =
reinterpret_cast<AllocationMemento*>(new_space->top() + kHeapObjectTag);
memento->set_map_no_write_barrier(heap->allocation_memento_map());
memento->set_allocation_site(
reinterpret_cast<AllocationSite*>(kHeapObjectTag), SKIP_WRITE_BARRIER);
}
TEST(Regress340063) {
CcTest::InitializeVM();
if (!i::FLAG_allocation_site_pretenuring) return;
v8::HandleScope scope(CcTest::isolate());
SetUpNewSpaceWithPoisonedMementoAtTop();
// Call GC to see if we can handle a poisonous memento right after the
// current new space top pointer.
CcTest::i_isolate()->heap()->CollectAllGarbage(
Heap::kAbortIncrementalMarkingMask);
}
TEST(BadMementoAfterTopForceScavenge) {
CcTest::InitializeVM();
if (!i::FLAG_allocation_site_pretenuring) return;
v8::HandleScope scope(CcTest::isolate());
SetUpNewSpaceWithPoisonedMementoAtTop();
// Force GC to test the poisoned memento handling
CcTest::i_isolate()->heap()->CollectGarbage(i::NEW_SPACE);
}
TEST(PretenuringCallNew) {
CcTest::InitializeVM();
if (!i::FLAG_allocation_site_pretenuring) return;
if (!i::FLAG_pretenuring_call_new) return;
v8::HandleScope scope(CcTest::isolate());
Isolate* isolate = CcTest::i_isolate();
Heap* heap = isolate->heap();
int call_count = 10;
i::ScopedVector<char> test_buf(1024);
const char* program =
"function f() {"
" this.a = 3;"
" this.b = {};"
" return this;"
"};"
"var a;"
"for(var i = 0; i < %d; i++) {"
" a = new f();"
"}"
"a;";
i::SNPrintF(test_buf, program, call_count);
v8::Local<v8::Value> res = CompileRun(test_buf.start());
Handle<JSObject> o =
v8::Utils::OpenHandle(*v8::Handle<v8::Object>::Cast(res));
// The object of class f should have a memento secreted behind it.
Address memento_address = o->address() + o->map()->instance_size();
AllocationMemento* memento =
reinterpret_cast<AllocationMemento*>(memento_address + kHeapObjectTag);
CHECK_EQ(memento->map(), heap->allocation_memento_map());
// Furthermore, how many mementos did we create? The count should match
// call_count. Note, that mementos are allocated during the inobject slack
// tracking phase.
AllocationSite* site = memento->GetAllocationSite();
CHECK_EQ(call_count, site->pretenure_create_count()->value());
}
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