chrome/nsChromeRegistry.h
author Chris Peterson <cpeterson@mozilla.com>
Thu, 22 Feb 2018 21:03:45 -0800
changeset 459227 6650c3db53ec00d4e8e8cee800755607fe7f08f5
parent 457915 26dc46bd3cccc934f5d8070cd8ba9a33d7a60cdf
child 476054 0673137d307f3878d4cf48160cfa16efb66c25b6
permissions -rw-r--r--
Bug 1443402 - Fix some -Wmissing-prototypes warnings in layout. r=dholbert -Wmissing-prototypes is a new optional warning available in clang ToT. It warns about global functions that have no previous function declaration (e.g. from an #included header file). These functions can probably be made static (allowing the compiler to better optimize them) or they may be unused. Confusingly, clang's -Wmissing-prototypes is equivalent to gcc's -Wmissing-declarations, not gcc's -Wmissing-prototypes. A function prototype is a function declaration that specifies the function's argument types. C++ requires that all function declarations specify their argument types, but C does not. As such, gcc's -Wmissing-prototypes is a C-only warning about C functions that have no previous function *prototypes* (with argument types), even if a previous function *declaration* (without argument types) was seen. MozReview-Commit-ID: FGKVLzeQ2oK

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */

#ifndef nsChromeRegistry_h
#define nsChromeRegistry_h

#include "nsIToolkitChromeRegistry.h"
#include "nsIObserver.h"
#include "nsWeakReference.h"

#ifdef MOZ_XUL
#include "nsIXULOverlayProvider.h"
#endif

#include "nsString.h"
#include "nsURIHashKey.h"
#include "nsInterfaceHashtable.h"
#include "nsXULAppAPI.h"

#include "mozilla/FileLocation.h"

class nsPIDOMWindowOuter;
class nsIPrefBranch;
class nsIURL;

// The chrome registry is actually split between nsChromeRegistryChrome and
// nsChromeRegistryContent. The work/data that is common to both resides in
// the shared nsChromeRegistry implementation, with operations that only make
// sense for one side erroring out in the other.

// for component registration
// {47049e42-1d87-482a-984d-56ae185e367a}
#define NS_CHROMEREGISTRY_CID \
{ 0x47049e42, 0x1d87, 0x482a, { 0x98, 0x4d, 0x56, 0xae, 0x18, 0x5e, 0x36, 0x7a } }

class nsChromeRegistry : public nsIToolkitChromeRegistry,
#ifdef MOZ_XUL
                         public nsIXULOverlayProvider,
#endif
                         public nsIObserver,
                         public nsSupportsWeakReference
{
public:
  NS_DECL_ISUPPORTS

  // nsIXULChromeRegistry methods:
  NS_IMETHOD ReloadChrome() override;
  NS_IMETHOD RefreshSkins() override;
  NS_IMETHOD AllowScriptsForPackage(nsIURI* url,
                                    bool* _retval) override;
  NS_IMETHOD AllowContentToAccess(nsIURI* url,
                                  bool* _retval) override;
  NS_IMETHOD CanLoadURLRemotely(nsIURI* url,
                                bool* _retval) override;
  NS_IMETHOD MustLoadURLRemotely(nsIURI* url,
                                 bool* _retval) override;

  // nsIChromeRegistry methods:
  NS_IMETHOD_(bool) WrappersEnabled(nsIURI *aURI) override;
  NS_IMETHOD ConvertChromeURL(nsIURI* aChromeURI, nsIURI* *aResult) override;

  // nsChromeRegistry methods:
  nsChromeRegistry() : mInitialized(false) { }

  virtual nsresult Init();

  static already_AddRefed<nsIChromeRegistry> GetService();

  static nsChromeRegistry* gChromeRegistry;

  // This method can change its parameter, so due to thread safety issues
  // it should only be called for nsCOMPtr<nsIURI> that is on the stack,
  // unless you know what you are doing.
  static nsresult Canonify(nsCOMPtr<nsIURI>& aChromeURL);

protected:
  virtual ~nsChromeRegistry();

  void FlushSkinCaches();
  void FlushAllCaches();

  static void LogMessage(const char* aMsg, ...)
    MOZ_FORMAT_PRINTF(1, 2);
  static void LogMessageWithContext(nsIURI* aURL, uint32_t aLineNumber, uint32_t flags,
                                    const char* aMsg, ...)
    MOZ_FORMAT_PRINTF(4, 5);

  virtual nsIURI* GetBaseURIFromPackage(const nsCString& aPackage,
                                        const nsCString& aProvider,
                                        const nsCString& aPath) = 0;
  virtual nsresult GetFlagsFromPackage(const nsCString& aPackage,
                                       uint32_t* aFlags) = 0;

  static nsresult RefreshWindow(nsPIDOMWindowOuter* aWindow);
  static nsresult GetProviderAndPath(nsIURI* aChromeURL,
                                     nsACString& aProvider, nsACString& aPath);

  bool GetDirectionForLocale(const nsACString& aLocale);

  void SanitizeForBCP47(nsACString& aLocale);

public:
  static already_AddRefed<nsChromeRegistry> GetSingleton();

  struct ManifestProcessingContext
  {
    ManifestProcessingContext(NSLocationType aType, mozilla::FileLocation &aFile)
      : mType(aType)
      , mFile(aFile)
    { }

    ~ManifestProcessingContext()
    { }

    nsIURI* GetManifestURI();
    already_AddRefed<nsIURI> ResolveURI(const char* uri);

    NSLocationType mType;
    mozilla::FileLocation mFile;
    nsCOMPtr<nsIURI> mManifestURI;
  };

  virtual void ManifestContent(ManifestProcessingContext& cx, int lineno,
                               char *const * argv, int flags) = 0;
  virtual void ManifestLocale(ManifestProcessingContext& cx, int lineno,
                              char *const * argv, int flags) = 0;
  virtual void ManifestSkin(ManifestProcessingContext& cx, int lineno,
                            char *const * argv, int flags) = 0;
  virtual void ManifestOverlay(ManifestProcessingContext& cx, int lineno,
                               char *const * argv, int flags) = 0;
  virtual void ManifestStyle(ManifestProcessingContext& cx, int lineno,
                             char *const * argv, int flags) = 0;
  virtual void ManifestOverride(ManifestProcessingContext& cx, int lineno,
                                char *const * argv, int flags) = 0;
  virtual void ManifestResource(ManifestProcessingContext& cx, int lineno,
                                char *const * argv, int flags) = 0;

  // Available flags
  enum {
    // This package should use the new XPCNativeWrappers to separate
    // content from chrome. This flag is currently unused (because we call
    // into xpconnect at registration time).
    XPCNATIVEWRAPPERS = 1 << 1,

    // Content script may access files in this package
    CONTENT_ACCESSIBLE = 1 << 2,

    // Package may be loaded remotely
    REMOTE_ALLOWED = 1 << 3,

    // Package must be loaded remotely
    REMOTE_REQUIRED = 1 << 4,
  };

  bool mInitialized;

  // "Override" table (chrome URI string -> real URI)
  nsInterfaceHashtable<nsURIHashKey, nsIURI> mOverrideTable;
};

#endif // nsChromeRegistry_h