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// Copyright (c) 2012 The Chromium 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 "content/renderer/pepper/host_var_tracker.h"
#include <tuple>
#include "base/logging.h"
#include "content/renderer/pepper/host_array_buffer_var.h"
#include "content/renderer/pepper/host_globals.h"
#include "content/renderer/pepper/host_resource_var.h"
#include "content/renderer/pepper/pepper_plugin_instance_impl.h"
#include "content/renderer/pepper/v8object_var.h"
#include "ppapi/c/pp_var.h"
using ppapi::ArrayBufferVar;
using ppapi::V8ObjectVar;
namespace content {
HostVarTracker::V8ObjectVarKey::V8ObjectVarKey(V8ObjectVar* object_var)
: instance(object_var->instance()->pp_instance()) {
v8::Local<v8::Object> object = object_var->GetHandle();
hash = object.IsEmpty() ? 0 : object->GetIdentityHash();
}
HostVarTracker::V8ObjectVarKey::V8ObjectVarKey(PP_Instance instance,
v8::Local<v8::Object> object)
: instance(instance),
hash(object.IsEmpty() ? 0 : object->GetIdentityHash()) {}
HostVarTracker::V8ObjectVarKey::~V8ObjectVarKey() {}
bool HostVarTracker::V8ObjectVarKey::operator<(
const V8ObjectVarKey& other) const {
return std::tie(instance, hash) < std::tie(other.instance, other.hash);
}
HostVarTracker::HostVarTracker()
: VarTracker(SINGLE_THREADED), last_shared_memory_map_id_(0) {}
HostVarTracker::~HostVarTracker() {}
ArrayBufferVar* HostVarTracker::CreateArrayBuffer(uint32_t size_in_bytes) {
return new HostArrayBufferVar(size_in_bytes);
}
ArrayBufferVar* HostVarTracker::CreateShmArrayBuffer(
uint32_t size_in_bytes,
base::SharedMemoryHandle handle) {
return new HostArrayBufferVar(size_in_bytes, handle);
}
void HostVarTracker::AddV8ObjectVar(V8ObjectVar* object_var) {
CheckThreadingPreconditions();
v8::HandleScope handle_scope(object_var->instance()->GetIsolate());
DCHECK(GetForV8Object(object_var->instance()->pp_instance(),
object_var->GetHandle()) == object_map_.end());
object_map_.insert(std::make_pair(V8ObjectVarKey(object_var), object_var));
}
void HostVarTracker::RemoveV8ObjectVar(V8ObjectVar* object_var) {
CheckThreadingPreconditions();
v8::HandleScope handle_scope(object_var->instance()->GetIsolate());
ObjectMap::iterator it = GetForV8Object(
object_var->instance()->pp_instance(), object_var->GetHandle());
DCHECK(it != object_map_.end());
object_map_.erase(it);
}
PP_Var HostVarTracker::V8ObjectVarForV8Object(PP_Instance instance,
v8::Local<v8::Object> object) {
CheckThreadingPreconditions();
ObjectMap::const_iterator it = GetForV8Object(instance, object);
if (it == object_map_.end())
return (new V8ObjectVar(instance, object))->GetPPVar();
return it->second->GetPPVar();
}
int HostVarTracker::GetLiveV8ObjectVarsForTest(PP_Instance instance) {
CheckThreadingPreconditions();
int count = 0;
// Use a key with an empty handle to find the v8 object var in the map with
// the given instance and the lowest hash.
V8ObjectVarKey key(instance, v8::Local<v8::Object>());
ObjectMap::const_iterator it = object_map_.lower_bound(key);
while (it != object_map_.end() && it->first.instance == instance) {
++count;
++it;
}
return count;
}
PP_Var HostVarTracker::MakeResourcePPVarFromMessage(
PP_Instance instance,
const IPC::Message& creation_message,
int pending_renderer_id,
int pending_browser_id) {
// On the host side, the creation message is ignored when creating a resource.
// Therefore, a call to this function indicates a null resource. Return the
// resource 0.
return MakeResourcePPVar(0);
}
ppapi::ResourceVar* HostVarTracker::MakeResourceVar(PP_Resource pp_resource) {
return new HostResourceVar(pp_resource);
}
void HostVarTracker::DidDeleteInstance(PP_Instance pp_instance) {
CheckThreadingPreconditions();
PepperPluginInstanceImpl* instance =
HostGlobals::Get()->GetInstance(pp_instance);
v8::HandleScope handle_scope(instance->GetIsolate());
// Force delete all var references. ForceReleaseV8Object() will cause
// this object, and potentially others it references, to be removed from
// |live_vars_|.
// Use a key with an empty handle to find the v8 object var in the map with
// the given instance and the lowest hash.
V8ObjectVarKey key(pp_instance, v8::Local<v8::Object>());
ObjectMap::iterator it = object_map_.lower_bound(key);
while (it != object_map_.end() && it->first.instance == pp_instance) {
ForceReleaseV8Object(it->second);
object_map_.erase(it++);
}
}
void HostVarTracker::ForceReleaseV8Object(ppapi::V8ObjectVar* object_var) {
object_var->InstanceDeleted();
VarMap::iterator iter = live_vars_.find(object_var->GetExistingVarID());
if (iter == live_vars_.end()) {
NOTREACHED();
return;
}
iter->second.ref_count = 0;
DCHECK(iter->second.track_with_no_reference_count == 0);
DeleteObjectInfoIfNecessary(iter);
}
HostVarTracker::ObjectMap::iterator HostVarTracker::GetForV8Object(
PP_Instance instance,
v8::Local<v8::Object> object) {
std::pair<ObjectMap::iterator, ObjectMap::iterator> range =
object_map_.equal_range(V8ObjectVarKey(instance, object));
for (ObjectMap::iterator it = range.first; it != range.second; ++it) {
if (object == it->second->GetHandle())
return it;
}
return object_map_.end();
}
int HostVarTracker::TrackSharedMemoryHandle(PP_Instance instance,
base::SharedMemoryHandle handle,
uint32_t size_in_bytes) {
SharedMemoryMapEntry entry;
entry.instance = instance;
entry.handle = handle;
entry.size_in_bytes = size_in_bytes;
// Find a free id for our map.
while (shared_memory_map_.find(last_shared_memory_map_id_) !=
shared_memory_map_.end()) {
++last_shared_memory_map_id_;
}
shared_memory_map_[last_shared_memory_map_id_] = entry;
return last_shared_memory_map_id_;
}
bool HostVarTracker::StopTrackingSharedMemoryHandle(
int id,
PP_Instance instance,
base::SharedMemoryHandle* handle,
uint32_t* size_in_bytes) {
SharedMemoryMap::iterator it = shared_memory_map_.find(id);
if (it == shared_memory_map_.end())
return false;
if (it->second.instance != instance)
return false;
*handle = it->second.handle;
*size_in_bytes = it->second.size_in_bytes;
shared_memory_map_.erase(it);
return true;
}
} // namespace content
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