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// Copyright 2011 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 "v8.h"
#include "global-handles.h"
#include "snapshot.h"
#include "cctest.h"
using namespace v8::internal;
static Handle<JSWeakMap> AllocateJSWeakMap() {
Handle<Map> map = FACTORY->NewMap(JS_WEAK_MAP_TYPE, JSWeakMap::kSize);
Handle<JSObject> weakmap_obj = FACTORY->NewJSObjectFromMap(map);
Handle<JSWeakMap> weakmap(JSWeakMap::cast(*weakmap_obj));
// Do not use handles for the hash table, it would make entries strong.
Object* table_obj = ObjectHashTable::Allocate(1)->ToObjectChecked();
ObjectHashTable* table = ObjectHashTable::cast(table_obj);
weakmap->set_table(table);
weakmap->set_next(Smi::FromInt(0));
return weakmap;
}
static void PutIntoWeakMap(Handle<JSWeakMap> weakmap,
Handle<JSObject> key,
Handle<Object> value) {
Handle<ObjectHashTable> table = PutIntoObjectHashTable(
Handle<ObjectHashTable>(ObjectHashTable::cast(weakmap->table())),
Handle<JSObject>(JSObject::cast(*key)),
value);
weakmap->set_table(*table);
}
static int NumberOfWeakCalls = 0;
static void WeakPointerCallback(v8::Persistent<v8::Value> handle, void* id) {
ASSERT(id == reinterpret_cast<void*>(1234));
NumberOfWeakCalls++;
handle.Dispose();
}
TEST(Weakness) {
FLAG_incremental_marking = false;
LocalContext context;
v8::HandleScope scope;
Handle<JSWeakMap> weakmap = AllocateJSWeakMap();
GlobalHandles* global_handles = Isolate::Current()->global_handles();
// Keep global reference to the key.
Handle<Object> key;
{
v8::HandleScope scope;
Handle<Map> map = FACTORY->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
Handle<JSObject> object = FACTORY->NewJSObjectFromMap(map);
key = global_handles->Create(*object);
}
CHECK(!global_handles->IsWeak(key.location()));
// Put entry into weak map.
{
v8::HandleScope scope;
PutIntoWeakMap(weakmap,
Handle<JSObject>(JSObject::cast(*key)),
Handle<Smi>(Smi::FromInt(23)));
}
CHECK_EQ(1, ObjectHashTable::cast(weakmap->table())->NumberOfElements());
// Force a full GC.
HEAP->CollectAllGarbage(false);
CHECK_EQ(0, NumberOfWeakCalls);
CHECK_EQ(1, ObjectHashTable::cast(weakmap->table())->NumberOfElements());
CHECK_EQ(
0, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements());
// Make the global reference to the key weak.
{
v8::HandleScope scope;
global_handles->MakeWeak(key.location(),
reinterpret_cast<void*>(1234),
&WeakPointerCallback);
}
CHECK(global_handles->IsWeak(key.location()));
// Force a full GC.
// Perform two consecutive GCs because the first one will only clear
// weak references whereas the second one will also clear weak maps.
HEAP->CollectAllGarbage(false);
CHECK_EQ(1, NumberOfWeakCalls);
CHECK_EQ(1, ObjectHashTable::cast(weakmap->table())->NumberOfElements());
CHECK_EQ(
0, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements());
HEAP->CollectAllGarbage(false);
CHECK_EQ(1, NumberOfWeakCalls);
CHECK_EQ(0, ObjectHashTable::cast(weakmap->table())->NumberOfElements());
CHECK_EQ(
1, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements());
}
TEST(Shrinking) {
LocalContext context;
v8::HandleScope scope;
Handle<JSWeakMap> weakmap = AllocateJSWeakMap();
// Check initial capacity.
CHECK_EQ(32, ObjectHashTable::cast(weakmap->table())->Capacity());
// Fill up weak map to trigger capacity change.
{
v8::HandleScope scope;
Handle<Map> map = FACTORY->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
for (int i = 0; i < 32; i++) {
Handle<JSObject> object = FACTORY->NewJSObjectFromMap(map);
PutIntoWeakMap(weakmap, object, Handle<Smi>(Smi::FromInt(i)));
}
}
// Check increased capacity.
CHECK_EQ(128, ObjectHashTable::cast(weakmap->table())->Capacity());
// Force a full GC.
CHECK_EQ(32, ObjectHashTable::cast(weakmap->table())->NumberOfElements());
CHECK_EQ(
0, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements());
HEAP->CollectAllGarbage(false);
CHECK_EQ(0, ObjectHashTable::cast(weakmap->table())->NumberOfElements());
CHECK_EQ(
32, ObjectHashTable::cast(weakmap->table())->NumberOfDeletedElements());
// Check shrunk capacity.
CHECK_EQ(32, ObjectHashTable::cast(weakmap->table())->Capacity());
}
// Test that weak map values on an evacuation candidate which are not reachable
// by other paths are correctly recorded in the slots buffer.
TEST(Regress2060a) {
FLAG_always_compact = true;
LocalContext context;
v8::HandleScope scope;
Handle<JSFunction> function =
FACTORY->NewFunction(FACTORY->function_symbol(), FACTORY->null_value());
Handle<JSObject> key = FACTORY->NewJSObject(function);
Handle<JSWeakMap> weakmap = AllocateJSWeakMap();
// Start second old-space page so that values land on evacuation candidate.
Page* first_page = HEAP->old_pointer_space()->anchor()->next_page();
FACTORY->NewFixedArray(900 * KB / kPointerSize, TENURED);
// Fill up weak map with values on an evacuation candidate.
{
v8::HandleScope scope;
for (int i = 0; i < 32; i++) {
Handle<JSObject> object = FACTORY->NewJSObject(function, TENURED);
CHECK(!HEAP->InNewSpace(object->address()));
CHECK(!first_page->Contains(object->address()));
PutIntoWeakMap(weakmap, key, object);
}
}
// Force compacting garbage collection.
CHECK(FLAG_always_compact);
HEAP->CollectAllGarbage(Heap::kNoGCFlags);
}
// Test that weak map keys on an evacuation candidate which are reachable by
// other strong paths are correctly recorded in the slots buffer.
TEST(Regress2060b) {
FLAG_always_compact = true;
#ifdef DEBUG
FLAG_verify_heap = true;
#endif
LocalContext context;
v8::HandleScope scope;
Handle<JSFunction> function =
FACTORY->NewFunction(FACTORY->function_symbol(), FACTORY->null_value());
// Start second old-space page so that keys land on evacuation candidate.
Page* first_page = HEAP->old_pointer_space()->anchor()->next_page();
FACTORY->NewFixedArray(900 * KB / kPointerSize, TENURED);
// Fill up weak map with keys on an evacuation candidate.
Handle<JSObject> keys[32];
for (int i = 0; i < 32; i++) {
keys[i] = FACTORY->NewJSObject(function, TENURED);
CHECK(!HEAP->InNewSpace(keys[i]->address()));
CHECK(!first_page->Contains(keys[i]->address()));
}
Handle<JSWeakMap> weakmap = AllocateJSWeakMap();
for (int i = 0; i < 32; i++) {
PutIntoWeakMap(weakmap, keys[i], Handle<Smi>(Smi::FromInt(i)));
}
// Force compacting garbage collection. The subsequent collections are used
// to verify that key references were actually updated.
CHECK(FLAG_always_compact);
HEAP->CollectAllGarbage(Heap::kNoGCFlags);
HEAP->CollectAllGarbage(Heap::kNoGCFlags);
HEAP->CollectAllGarbage(Heap::kNoGCFlags);
}
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