v8/test/cctest/test-dictionary.cc
ulan@chromium.org 0e8e003077 Implement in-place rehashing of HashTable.
The algorithm puts elements into correct positions in  multiple iterations.
On the first iteration it tries to put elements at entries specified by
their first hash probe. On the second iteration -- by the second
hash probe, and so on. Overall it does O(k*n) memory accesses, where
k is the maximum number of probes required for an element and n is the
capacity of the hash table. The expectation is that k will be small.

R=mstarzinger@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23658031

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16678 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2013-09-12 11:03:27 +00:00

216 lines
7.9 KiB
C++

// 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 "api.h"
#include "debug.h"
#include "execution.h"
#include "factory.h"
#include "macro-assembler.h"
#include "objects.h"
#include "global-handles.h"
#include "cctest.h"
using namespace v8::internal;
TEST(ObjectHashTable) {
LocalContext context;
Isolate* isolate = Isolate::Current();
Factory* factory = isolate->factory();
v8::HandleScope scope(context->GetIsolate());
Handle<ObjectHashTable> table = factory->NewObjectHashTable(23);
Handle<JSObject> a = factory->NewJSArray(7);
Handle<JSObject> b = factory->NewJSArray(11);
table = PutIntoObjectHashTable(table, a, b);
CHECK_EQ(table->NumberOfElements(), 1);
CHECK_EQ(table->Lookup(*a), *b);
CHECK_EQ(table->Lookup(*b), HEAP->the_hole_value());
// Keys still have to be valid after objects were moved.
HEAP->CollectGarbage(NEW_SPACE);
CHECK_EQ(table->NumberOfElements(), 1);
CHECK_EQ(table->Lookup(*a), *b);
CHECK_EQ(table->Lookup(*b), HEAP->the_hole_value());
// Keys that are overwritten should not change number of elements.
table = PutIntoObjectHashTable(table, a, factory->NewJSArray(13));
CHECK_EQ(table->NumberOfElements(), 1);
CHECK_NE(table->Lookup(*a), *b);
// Keys mapped to the hole should be removed permanently.
table = PutIntoObjectHashTable(table, a, factory->the_hole_value());
CHECK_EQ(table->NumberOfElements(), 0);
CHECK_EQ(table->NumberOfDeletedElements(), 1);
CHECK_EQ(table->Lookup(*a), HEAP->the_hole_value());
// Keys should map back to their respective values and also should get
// an identity hash code generated.
for (int i = 0; i < 100; i++) {
Handle<JSReceiver> key = factory->NewJSArray(7);
Handle<JSObject> value = factory->NewJSArray(11);
table = PutIntoObjectHashTable(table, key, value);
CHECK_EQ(table->NumberOfElements(), i + 1);
CHECK_NE(table->FindEntry(*key), ObjectHashTable::kNotFound);
CHECK_EQ(table->Lookup(*key), *value);
CHECK(key->GetIdentityHash(OMIT_CREATION)->ToObjectChecked()->IsSmi());
}
// Keys never added to the map which already have an identity hash
// code should not be found.
for (int i = 0; i < 100; i++) {
Handle<JSReceiver> key = factory->NewJSArray(7);
CHECK(key->GetIdentityHash(ALLOW_CREATION)->ToObjectChecked()->IsSmi());
CHECK_EQ(table->FindEntry(*key), ObjectHashTable::kNotFound);
CHECK_EQ(table->Lookup(*key), HEAP->the_hole_value());
CHECK(key->GetIdentityHash(OMIT_CREATION)->ToObjectChecked()->IsSmi());
}
// Keys that don't have an identity hash should not be found and also
// should not get an identity hash code generated.
for (int i = 0; i < 100; i++) {
Handle<JSReceiver> key = factory->NewJSArray(7);
CHECK_EQ(table->Lookup(*key), HEAP->the_hole_value());
CHECK_EQ(key->GetIdentityHash(OMIT_CREATION), HEAP->undefined_value());
}
}
class ObjectHashTableTest: public ObjectHashTable {
public:
void insert(int entry, int key, int value) {
set(EntryToIndex(entry), Smi::FromInt(key));
set(EntryToIndex(entry) + 1, Smi::FromInt(value));
}
int lookup(int key) {
return Smi::cast(Lookup(Smi::FromInt(key)))->value();
}
int capacity() {
return Capacity();
}
};
TEST(HashTableRehash) {
LocalContext context;
Isolate* isolate = Isolate::Current();
Factory* factory = isolate->factory();
v8::HandleScope scope(context->GetIsolate());
// Test almost filled table.
{
Handle<ObjectHashTable> table = factory->NewObjectHashTable(100);
ObjectHashTableTest* t = reinterpret_cast<ObjectHashTableTest*>(*table);
int capacity = t->capacity();
for (int i = 0; i < capacity - 1; i++) {
t->insert(i, i * i, i);
}
t->Rehash(Smi::FromInt(0));
for (int i = 0; i < capacity - 1; i++) {
CHECK_EQ(i, t->lookup(i * i));
}
}
// Test half-filled table.
{
Handle<ObjectHashTable> table = factory->NewObjectHashTable(100);
ObjectHashTableTest* t = reinterpret_cast<ObjectHashTableTest*>(*table);
int capacity = t->capacity();
for (int i = 0; i < capacity / 2; i++) {
t->insert(i, i * i, i);
}
t->Rehash(Smi::FromInt(0));
for (int i = 0; i < capacity / 2; i++) {
CHECK_EQ(i, t->lookup(i * i));
}
}
}
#ifdef DEBUG
TEST(ObjectHashSetCausesGC) {
i::FLAG_stress_compaction = false;
LocalContext context;
Isolate* isolate = Isolate::Current();
Factory* factory = isolate->factory();
v8::HandleScope scope(context->GetIsolate());
Handle<ObjectHashSet> table = factory->NewObjectHashSet(1);
Handle<JSObject> key = factory->NewJSArray(0);
v8::Handle<v8::Object> key_obj = v8::Utils::ToLocal(key);
// Force allocation of hash table backing store for hidden properties.
key_obj->SetHiddenValue(v8_str("key 1"), v8_str("val 1"));
key_obj->SetHiddenValue(v8_str("key 2"), v8_str("val 2"));
key_obj->SetHiddenValue(v8_str("key 3"), v8_str("val 3"));
// Simulate a full heap so that generating an identity hash code
// in subsequent calls will request GC.
SimulateFullSpace(HEAP->new_space());
SimulateFullSpace(HEAP->old_pointer_space());
// Calling Contains() should not cause GC ever.
CHECK(!table->Contains(*key));
// Calling Remove() should not cause GC ever.
CHECK(!table->Remove(*key)->IsFailure());
// Calling Add() should request GC by returning a failure.
CHECK(table->Add(*key)->IsRetryAfterGC());
}
#endif
#ifdef DEBUG
TEST(ObjectHashTableCausesGC) {
i::FLAG_stress_compaction = false;
LocalContext context;
Isolate* isolate = Isolate::Current();
Factory* factory = isolate->factory();
v8::HandleScope scope(context->GetIsolate());
Handle<ObjectHashTable> table = factory->NewObjectHashTable(1);
Handle<JSObject> key = factory->NewJSArray(0);
v8::Handle<v8::Object> key_obj = v8::Utils::ToLocal(key);
// Force allocation of hash table backing store for hidden properties.
key_obj->SetHiddenValue(v8_str("key 1"), v8_str("val 1"));
key_obj->SetHiddenValue(v8_str("key 2"), v8_str("val 2"));
key_obj->SetHiddenValue(v8_str("key 3"), v8_str("val 3"));
// Simulate a full heap so that generating an identity hash code
// in subsequent calls will request GC.
SimulateFullSpace(HEAP->new_space());
SimulateFullSpace(HEAP->old_pointer_space());
// Calling Lookup() should not cause GC ever.
CHECK(table->Lookup(*key)->IsTheHole());
// Calling Put() should request GC by returning a failure.
CHECK(table->Put(*key, *key)->IsRetryAfterGC());
}
#endif