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// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/api/api.h"
#include "src/base/platform/semaphore.h"
#include "src/handles/handles-inl.h"
#include "src/handles/local-handles-inl.h"
#include "src/handles/persistent-handles.h"
#include "src/heap/heap.h"
#include "src/heap/local-heap.h"
#include "src/objects/contexts.h"
#include "test/cctest/cctest.h"
#include "test/cctest/heap/heap-utils.h"
namespace v8 {
namespace internal {
namespace {
std::atomic<int> g_initialized_entries;
class ScriptContextTableAccessUsedThread final : public v8::base::Thread {
public:
ScriptContextTableAccessUsedThread(
Isolate* isolate, Heap* heap, base::Semaphore* sema_started,
std::unique_ptr<PersistentHandles> ph,
Handle<ScriptContextTable> script_context_table)
: v8::base::Thread(
base::Thread::Options("ScriptContextTableAccessUsedThread")),
isolate_(isolate),
heap_(heap),
sema_started_(sema_started),
ph_(std::move(ph)),
script_context_table_(script_context_table) {}
void Run() override {
LocalHeap local_heap(heap_, std::move(ph_));
LocalHandleScope scope(&local_heap);
sema_started_->Signal();
for (int i = 0; i < script_context_table_->synchronized_used(); ++i) {
Context context = script_context_table_->get_context(i);
CHECK(context.IsScriptContext());
}
CHECK(!ph_);
ph_ = local_heap.DetachPersistentHandles();
}
Isolate* isolate_;
Heap* heap_;
base::Semaphore* sema_started_;
std::unique_ptr<PersistentHandles> ph_;
Handle<ScriptContextTable> script_context_table_;
};
class AccessScriptContextTableThread final : public v8::base::Thread {
public:
AccessScriptContextTableThread(Isolate* isolate, Heap* heap,
base::Semaphore* sema_started,
std::unique_ptr<PersistentHandles> ph,
Handle<NativeContext> native_context)
: v8::base::Thread(
base::Thread::Options("AccessScriptContextTableThread")),
isolate_(isolate),
heap_(heap),
sema_started_(sema_started),
ph_(std::move(ph)),
native_context_(native_context) {}
void Run() override {
LocalHeap local_heap(heap_, std::move(ph_));
LocalHandleScope scope(&local_heap);
sema_started_->Signal();
for (int i = 0; i < 1000; ++i) {
// Read upper bound with relaxed semantics to not add any ordering
// constraints.
while (i >= g_initialized_entries.load(std::memory_order_relaxed)) {
}
auto script_context_table = Handle<ScriptContextTable>(
native_context_->synchronized_script_context_table(), &local_heap);
Handle<Context> context(script_context_table->get_context(i),
&local_heap);
CHECK(!context.is_null());
}
CHECK(!ph_);
ph_ = local_heap.DetachPersistentHandles();
}
Isolate* isolate_;
Heap* heap_;
base::Semaphore* sema_started_;
std::unique_ptr<PersistentHandles> ph_;
Handle<NativeContext> native_context_;
};
TEST(ScriptContextTable_Extend) {
CcTest::InitializeVM();
v8::HandleScope scope(CcTest::isolate());
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Handle<NativeContext> native_context = factory->NewNativeContext();
Handle<Map> script_context_map =
factory->NewMap(SCRIPT_CONTEXT_TYPE, kVariableSizeSentinel);
script_context_map->set_native_context(*native_context);
native_context->set_script_context_map(*script_context_map);
Handle<ScriptContextTable> script_context_table =
factory->NewScriptContextTable();
Handle<ScopeInfo> scope_info =
ReadOnlyRoots(isolate).global_this_binding_scope_info_handle();
for (int i = 0; i < 10; ++i) {
Handle<Context> script_context =
factory->NewScriptContext(native_context, scope_info);
script_context_table =
ScriptContextTable::Extend(script_context_table, script_context);
}
std::unique_ptr<PersistentHandles> ph = isolate->NewPersistentHandles();
Handle<ScriptContextTable> persistent_script_context_table =
ph->NewHandle(script_context_table);
base::Semaphore sema_started(0);
auto thread = std::make_unique<ScriptContextTableAccessUsedThread>(
isolate, isolate->heap(), &sema_started, std::move(ph),
persistent_script_context_table);
CHECK(thread->Start());
sema_started.Wait();
for (int i = 0; i < 100; ++i) {
Handle<Context> context =
factory->NewScriptContext(native_context, scope_info);
script_context_table =
ScriptContextTable::Extend(script_context_table, context);
}
thread->Join();
}
TEST(ScriptContextTable_AccessScriptContextTable) {
CcTest::InitializeVM();
v8::HandleScope scope(CcTest::isolate());
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Handle<NativeContext> native_context = factory->NewNativeContext();
Handle<Map> script_context_map =
factory->NewMap(SCRIPT_CONTEXT_TYPE, kVariableSizeSentinel);
script_context_map->set_native_context(*native_context);
native_context->set_script_context_map(*script_context_map);
Handle<ScopeInfo> scope_info =
ReadOnlyRoots(isolate).global_this_binding_scope_info_handle();
Handle<ScriptContextTable> script_context_table =
factory->NewScriptContextTable();
Handle<Context> context =
factory->NewScriptContext(native_context, scope_info);
script_context_table =
ScriptContextTable::Extend(script_context_table, context);
int initialized_entries = 1;
g_initialized_entries.store(initialized_entries, std::memory_order_release);
native_context->set_script_context_table(*script_context_table);
std::unique_ptr<PersistentHandles> ph = isolate->NewPersistentHandles();
Handle<NativeContext> persistent_native_context =
ph->NewHandle(native_context);
base::Semaphore sema_started(0);
auto thread = std::make_unique<AccessScriptContextTableThread>(
isolate, isolate->heap(), &sema_started, std::move(ph),
persistent_native_context);
CHECK(thread->Start());
sema_started.Wait();
for (; initialized_entries < 1000; ++initialized_entries) {
Handle<Context> context =
factory->NewScriptContext(native_context, scope_info);
script_context_table =
ScriptContextTable::Extend(script_context_table, context);
native_context->synchronized_set_script_context_table(
*script_context_table);
// Update with relaxed semantics to not introduce ordering constraints.
g_initialized_entries.store(initialized_entries, std::memory_order_relaxed);
}
g_initialized_entries.store(initialized_entries, std::memory_order_relaxed);
thread->Join();
}
} // anonymous namespace
} // namespace internal
} // namespace v8
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