DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (2f44d750d784)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "StaticComponents.h"

#include "mozilla/PerfectHash.h"
#include "mozilla/ResultExtensions.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozJSComponentLoader.h"
#include "nsCOMPtr.h"
#include "nsComponentManager.h"
#include "nsContentUtils.h"
#include "nsIFactory.h"
#include "nsISupports.h"
#include "nsString.h"
#include "nsStringEnumerator.h"

// Cleanup pollution from zipstruct.h
#undef UNSUPPORTED

// Public includes
//# @includes@

// Relative includes
//# @relative_includes@

//# @decls@

namespace mozilla {

using dom::AutoJSAPI;

namespace xpcom {

static constexpr uint32_t kNoContractID = 0xffffffff;

namespace {
// Template helpers for constructor function sanity checks.
template <typename T>
struct RemoveAlreadyAddRefed {
  using Type = T;
};

template <typename T>
struct RemoveAlreadyAddRefed<already_AddRefed<T>> {
  using Type = T;
};
}  // anonymous namespace


uint8_t gInvalidContracts[kContractCount / 8 + 1];

static StaticRefPtr<nsISupports> gServiceInstances[kStaticModuleCount];

uint8_t gInitCalled[kModuleInitCount / 8 + 1];

static const char gStrings[] =
//# @strings@
  "";

const StaticCategory gStaticCategories[kStaticCategoryCount] = {
//# @categories@
};
const StaticCategoryEntry gStaticCategoryEntries[] = {
//# @category_entries@
};

const StringOffset gComponentJSMs[] = {
//# @component_jsms@
};

/**
 * Returns a nsCString corresponding to the given entry in the `gStrings` string
 * table. The resulting nsCString points directly to static storage, and does
 * not incur any memory allocation overhead.
 */
static inline nsCString GetString(const StringOffset& aOffset) {
  const char* str = &gStrings[aOffset.mOffset];
  nsCString result;
  result.AssignLiteral(str, strlen(str));
  return result;
}

nsCString ContractEntry::ContractID() const {
  return GetString(mContractID);
}

bool ContractEntry::Matches(const nsACString& aContractID) const {
  return aContractID == ContractID() && Module().Active();
}


static nsresult ConstructJSMComponent(const nsACString& aURI,
                                      const char* aConstructor,
                                      nsISupports** aResult) {
  if (!nsComponentManagerImpl::JSLoaderReady()) {
    return NS_ERROR_NOT_AVAILABLE;
  }

  AutoJSAPI jsapi;
  MOZ_ALWAYS_TRUE(jsapi.Init(xpc::PrivilegedJunkScope()));
  JSContext* cx = jsapi.cx();

  JS::RootedObject global(cx);
  JS::RootedObject exports(cx);
  MOZ_TRY(mozJSComponentLoader::Get()->Import(cx, aURI, &global, &exports));

  JS::RootedValue ctor(cx);
  if (!JS_GetProperty(cx, exports, aConstructor, &ctor) ||
      !ctor.isObject()) {
    return NS_ERROR_XPC_JSOBJECT_HAS_NO_FUNCTION_NAMED;
  }

  JS::RootedObject inst(cx);
  if (!JS::Construct(cx, ctor, JS::HandleValueArray::empty(), &inst)) {
    return NS_ERROR_FAILURE;
  }

  return nsContentUtils::XPConnect()->WrapJS(cx, inst, NS_GET_IID(nsISupports),
                                             (void**)aResult);
}


//# @module_cid_table@

//# @module_contract_id_table@

static inline bool CalledInit(size_t aIdx) {
  return GetBit(gInitCalled, aIdx);
}

static nsresult CallInitFunc(size_t aIdx) {
  if (CalledInit(aIdx)) {
    return NS_OK;
  }

  nsresult rv = NS_OK;
  switch (aIdx) {
//# @init_funcs@
  }

  SetBit(gInitCalled, aIdx);

  MOZ_ASSERT(NS_SUCCEEDED(rv));
  return rv;
}

static void CallUnloadFuncs() {
//# @unload_funcs@
}

static nsresult CreateInstanceImpl(ModuleID aID, nsISupports* aOuter,
                                   const nsIID& aIID, void** aResult) {
  if (aOuter) {
    return NS_ERROR_NO_AGGREGATION;
  }

  // The full set of constructors for all static modules.
  // This switch statement will be compiled to a relative address jump table
  // with no runtime relocations and a single indirect jump.
  switch (aID) {
//# @constructors@
  }

  MOZ_ASSERT_UNREACHABLE("Constructor didn't return");
  return NS_ERROR_FAILURE;
}


namespace {

class StaticModuleFactory final : public nsIFactory {
  NS_DECL_ISUPPORTS
  NS_DECL_NSIFACTORY

  explicit StaticModuleFactory(ModuleID aID) : mID(aID) {}

private:
  ~StaticModuleFactory() = default;

  const ModuleID mID;
};

NS_IMPL_ISUPPORTS(StaticModuleFactory, nsIFactory)

NS_IMETHODIMP StaticModuleFactory::CreateInstance(nsISupports* aOuter,
                                                  const nsIID& aIID,
                                                  void** aResult) {
  return CreateInstanceImpl(mID, aOuter, aIID, aResult);
}

NS_IMETHODIMP StaticModuleFactory::LockFactory(bool aLock) {
  MOZ_CRASH("LockFactory is no longer a thing");
  return NS_ERROR_NOT_IMPLEMENTED;
}

}  // anonymous namespace


already_AddRefed<nsIFactory> StaticModule::GetFactory() const {
  return do_AddRef(new StaticModuleFactory(ID()));
}

bool StaticModule::Active() const {
  return FastProcessSelectorMatches(mProcessSelector);
}

bool StaticModule::Overridable() const {
  return mContractID.mOffset != kNoContractID;
}

nsCString StaticModule::ContractID() const {
  MOZ_ASSERT(Overridable());
  return GetString(mContractID);
}

nsresult StaticModule::CreateInstance(nsISupports* aOuter, const nsIID& aIID,
                                      void** aResult) const {
  return CreateInstanceImpl(ID(), aOuter, aIID, aResult);
}


nsISupports* StaticModule::ServiceInstance() const {
  return gServiceInstances[Idx()];
}

void StaticModule::SetServiceInstance(
    already_AddRefed<nsISupports> aInst) const {
  gServiceInstances[Idx()] = aInst;
}


nsCString StaticCategoryEntry::Entry() const {
  return GetString(mEntry);
}
nsCString StaticCategoryEntry::Value() const {
  return GetString(mValue);
}
bool StaticCategoryEntry::Active() const {
  return FastProcessSelectorMatches(mProcessSelector);
}

nsCString StaticCategory::Name() const {
  return GetString(mName);
}


/* static */ const StaticModule* StaticComponents::LookupByCID(
    const nsID& aCID) {
  return ModuleByCID(aCID);
}

/* static */ const StaticModule* StaticComponents::LookupByContractID(
    const nsACString& aContractID) {
  if (const ContractEntry* entry = LookupContractID(aContractID)) {
    if (!entry->Invalid()) {
      return &entry->Module();
    }
  }
  return nullptr;
}

/* static */ bool StaticComponents::InvalidateContractID(
    const nsACString& aContractID, bool aInvalid) {
  if (const ContractEntry* entry = LookupContractID(aContractID)) {
    entry->SetInvalid(aInvalid);
    return true;
  }
  return false;
}

/* static */ already_AddRefed<nsIUTF8StringEnumerator>
StaticComponents::GetComponentJSMs() {
  auto jsms = MakeUnique<nsTArray<nsCString>>(MOZ_ARRAY_LENGTH(gComponentJSMs));

  for (const auto& entry : gComponentJSMs) {
    jsms->AppendElement(GetString(entry));
  }

  nsCOMPtr<nsIUTF8StringEnumerator> result;
  MOZ_ALWAYS_SUCCEEDS(NS_NewAdoptingUTF8StringEnumerator(getter_AddRefs(result),
                                                         jsms.release()));
  return result.forget();
}

/* static */ void StaticComponents::Shutdown() {
  CallUnloadFuncs();
}

/* static */ const nsID& Components::GetCID(ModuleID aID) {
  return gStaticModules[size_t(aID)].CID();
}

nsresult GetServiceHelper::operator()(const nsIID& aIID, void** aResult) const {
  nsresult rv =
      nsComponentManagerImpl::gComponentManager->GetService(mId, aIID, aResult);
  return SetResult(rv);
}

nsresult CreateInstanceHelper::operator()(const nsIID& aIID,
                                          void** aResult) const {
  const auto& entry = gStaticModules[size_t(mId)];
  if (!entry.Active()) {
    return SetResult(NS_ERROR_FACTORY_NOT_REGISTERED);
  }

  nsresult rv = entry.CreateInstance(nullptr, aIID, aResult);
  return SetResult(rv);
}

}  // namespace xpcom
}  // namespace mozilla