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gecko-dev/layout/style/Loader.h
Xidorn Quan e0f34c4221 Bug 1352763 part 2 - Pass borrowed child stylesheet to Gecko for loading rather than the import rule. r=emilio 
This is necessary because if we pass in the import rule, we would need
to invoke Servo_ImportRule_GetSheet to get the child sheet. However,
Servo_ImportRule_GetSheet tries to lock the global rwlock with read
access, while Servo_CssRules_InsertRule has already locked the same
rwlock with write access for the CSSOM case.

Since the import rule itself is never needed in the code path, it is
easier to just pass in the child stylesheet.

MozReview-Commit-ID: 4njNyGniPIm

--HG--
extra : rebase_source : ad88929713fdc5a581addc044094fa8130125121
2017-04-03 16:18:49 +10:00

637 lines
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/* -*- 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/. */
/* loading of CSS style sheets using the network APIs */
#ifndef mozilla_css_Loader_h
#define mozilla_css_Loader_h
#include "nsIPrincipal.h"
#include "nsAutoPtr.h"
#include "nsCompatibility.h"
#include "nsCycleCollectionParticipant.h"
#include "nsDataHashtable.h"
#include "nsRefPtrHashtable.h"
#include "nsStringFwd.h"
#include "nsTArray.h"
#include "nsTObserverArray.h"
#include "nsURIHashKey.h"
#include "mozilla/Attributes.h"
#include "mozilla/CORSMode.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/Maybe.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/StyleBackendType.h"
#include "mozilla/StyleSheet.h"
#include "mozilla/net/ReferrerPolicy.h"
class nsICSSLoaderObserver;
class nsIConsoleReportCollector;
class nsIContent;
class nsIDocument;
class nsMediaList;
class nsIStyleSheetLinkingElement;
namespace mozilla {
namespace dom {
class DocGroup;
class Element;
} // namespace dom
} // namespace mozilla
namespace mozilla {
class URIPrincipalReferrerPolicyAndCORSModeHashKey : public nsURIHashKey
{
public:
typedef URIPrincipalReferrerPolicyAndCORSModeHashKey* KeyType;
typedef const URIPrincipalReferrerPolicyAndCORSModeHashKey* KeyTypePointer;
typedef mozilla::net::ReferrerPolicy ReferrerPolicy;
explicit URIPrincipalReferrerPolicyAndCORSModeHashKey(const URIPrincipalReferrerPolicyAndCORSModeHashKey* aKey)
: nsURIHashKey(aKey->mKey),
mPrincipal(aKey->mPrincipal),
mCORSMode(aKey->mCORSMode),
mReferrerPolicy(aKey->mReferrerPolicy)
{
MOZ_COUNT_CTOR(URIPrincipalReferrerPolicyAndCORSModeHashKey);
}
URIPrincipalReferrerPolicyAndCORSModeHashKey(nsIURI* aURI,
nsIPrincipal* aPrincipal,
CORSMode aCORSMode,
ReferrerPolicy aReferrerPolicy)
: nsURIHashKey(aURI),
mPrincipal(aPrincipal),
mCORSMode(aCORSMode),
mReferrerPolicy(aReferrerPolicy)
{
MOZ_COUNT_CTOR(URIPrincipalReferrerPolicyAndCORSModeHashKey);
}
URIPrincipalReferrerPolicyAndCORSModeHashKey(const URIPrincipalReferrerPolicyAndCORSModeHashKey& toCopy)
: nsURIHashKey(toCopy),
mPrincipal(toCopy.mPrincipal),
mCORSMode(toCopy.mCORSMode),
mReferrerPolicy(toCopy.mReferrerPolicy)
{
MOZ_COUNT_CTOR(URIPrincipalReferrerPolicyAndCORSModeHashKey);
}
~URIPrincipalReferrerPolicyAndCORSModeHashKey()
{
MOZ_COUNT_DTOR(URIPrincipalReferrerPolicyAndCORSModeHashKey);
}
URIPrincipalReferrerPolicyAndCORSModeHashKey* GetKey() const {
return const_cast<URIPrincipalReferrerPolicyAndCORSModeHashKey*>(this);
}
const URIPrincipalReferrerPolicyAndCORSModeHashKey* GetKeyPointer() const { return this; }
bool KeyEquals(const URIPrincipalReferrerPolicyAndCORSModeHashKey* aKey) const {
if (!nsURIHashKey::KeyEquals(aKey->mKey)) {
return false;
}
if (!mPrincipal != !aKey->mPrincipal) {
// One or the other has a principal, but not both... not equal
return false;
}
if (mCORSMode != aKey->mCORSMode) {
// Different CORS modes; we don't match
return false;
}
if (mReferrerPolicy != aKey->mReferrerPolicy) {
// Different ReferrerPolicy; we don't match
return false;
}
bool eq;
return !mPrincipal ||
(NS_SUCCEEDED(mPrincipal->Equals(aKey->mPrincipal, &eq)) && eq);
}
static const URIPrincipalReferrerPolicyAndCORSModeHashKey*
KeyToPointer(URIPrincipalReferrerPolicyAndCORSModeHashKey* aKey) { return aKey; }
static PLDHashNumber HashKey(const URIPrincipalReferrerPolicyAndCORSModeHashKey* aKey) {
return nsURIHashKey::HashKey(aKey->mKey);
}
nsIURI* GetURI() const { return nsURIHashKey::GetKey(); }
enum { ALLOW_MEMMOVE = true };
protected:
nsCOMPtr<nsIPrincipal> mPrincipal;
CORSMode mCORSMode;
ReferrerPolicy mReferrerPolicy;
};
namespace css {
class SheetLoadData;
class ImportRule;
/*********************
* Style sheet reuse *
*********************/
class MOZ_RAII LoaderReusableStyleSheets
{
public:
LoaderReusableStyleSheets()
{
}
/**
* Look for a reusable sheet (see AddReusableSheet) matching the
* given URL. If found, set aResult, remove the reused sheet from
* the internal list, and return true. If not found, return false;
* in this case, aResult is not modified.
*
* @param aURL the url to match
* @param aResult [out] the style sheet which can be reused
*/
bool FindReusableStyleSheet(nsIURI* aURL, RefPtr<CSSStyleSheet>& aResult);
/**
* Indicate that a certain style sheet is available for reuse if its
* URI matches the URI of an @import. Sheets should be added in the
* opposite order in which they are intended to be reused.
*
* @param aSheet the sheet which can be reused
*/
void AddReusableSheet(CSSStyleSheet* aSheet) {
mReusableSheets.AppendElement(aSheet);
}
private:
LoaderReusableStyleSheets(const LoaderReusableStyleSheets&) = delete;
LoaderReusableStyleSheets& operator=(const LoaderReusableStyleSheets&) = delete;
// The sheets that can be reused.
nsTArray<RefPtr<CSSStyleSheet>> mReusableSheets;
};
/***********************************************************************
* Enum that describes the state of the sheet returned by CreateSheet. *
***********************************************************************/
enum StyleSheetState {
eSheetStateUnknown = 0,
eSheetNeedsParser,
eSheetPending,
eSheetLoading,
eSheetComplete
};
class Loader final {
typedef mozilla::net::ReferrerPolicy ReferrerPolicy;
public:
// aDocGroup is used for dispatching SheetLoadData in PostLoadEvent(). It
// can be null if you want to use this constructor, and there's no
// document when the Loader is constructed.
Loader(StyleBackendType aType, mozilla::dom::DocGroup* aDocGroup);
explicit Loader(nsIDocument*);
private:
// Private destructor, to discourage deletion outside of Release():
~Loader();
public:
NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(Loader)
NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(Loader)
void DropDocumentReference(); // notification that doc is going away
void SetCompatibilityMode(nsCompatibility aCompatMode)
{ mCompatMode = aCompatMode; }
nsCompatibility GetCompatibilityMode() { return mCompatMode; }
nsresult SetPreferredSheet(const nsAString& aTitle);
// XXXbz sort out what the deal is with events! When should they fire?
/**
* Load an inline style sheet. If a successful result is returned and
* *aCompleted is false, then aObserver is guaranteed to be notified
* asynchronously once the sheet is marked complete. If an error is
* returned, or if *aCompleted is true, aObserver will not be notified. In
* addition to parsing the sheet, this method will insert it into the
* stylesheet list of this CSSLoader's document.
*
* @param aElement the element linking to the stylesheet. This must not be
* null and must implement nsIStyleSheetLinkingElement.
* @param aBuffer the stylesheet data
* @param aLineNumber the line number at which the stylesheet data started.
* @param aTitle the title of the sheet.
* @param aMedia the media string for the sheet.
* @param aObserver the observer to notify when the load completes.
* May be null.
* @param [out] aCompleted whether parsing of the sheet completed.
* @param [out] aIsAlternate whether the stylesheet ended up being an
* alternate sheet.
*/
nsresult LoadInlineStyle(nsIContent* aElement,
const nsAString& aBuffer,
uint32_t aLineNumber,
const nsAString& aTitle,
const nsAString& aMedia,
mozilla::dom::Element* aScopeElement,
nsICSSLoaderObserver* aObserver,
bool* aCompleted,
bool* aIsAlternate);
/**
* Load a linked (document) stylesheet. If a successful result is returned,
* aObserver is guaranteed to be notified asynchronously once the sheet is
* loaded and marked complete. If an error is returned, aObserver will not
* be notified. In addition to loading the sheet, this method will insert it
* into the stylesheet list of this CSSLoader's document.
*
* @param aElement the element linking to the the stylesheet. May be null.
* @param aURL the URL of the sheet.
* @param aTitle the title of the sheet.
* @param aMedia the media string for the sheet.
* @param aHasAlternateRel whether the rel for this link included
* "alternate".
* @param aCORSMode the CORS mode for this load.
* @param aObserver the observer to notify when the load completes.
* May be null.
* @param [out] aIsAlternate whether the stylesheet actually ended up beinga
* an alternate sheet. Note that this need not match
* aHasAlternateRel.
*/
nsresult LoadStyleLink(nsIContent* aElement,
nsIURI* aURL,
const nsAString& aTitle,
const nsAString& aMedia,
bool aHasAlternateRel,
CORSMode aCORSMode,
ReferrerPolicy aReferrerPolicy,
const nsAString& aIntegrity,
nsICSSLoaderObserver* aObserver,
bool* aIsAlternate);
/**
* Load a child (@import-ed) style sheet. In addition to loading the sheet,
* this method will insert it into the child sheet list of aParentSheet. If
* there is no sheet currently being parsed and the child sheet is not
* complete when this method returns, then when the child sheet becomes
* complete aParentSheet will be QIed to nsICSSLoaderObserver and
* asynchronously notified, just like for LoadStyleLink. Note that if the
* child sheet is already complete when this method returns, no
* nsICSSLoaderObserver notification will be sent.
*
* @param aParentSheet the parent of this child sheet
* @param aURL the URL of the child sheet
* @param aMedia the already-parsed media list for the child sheet
* @param aGeckoParentRule the @import rule importing this child, when using
* Gecko's style system. This is used to properly
* order the child sheet list of aParentSheet.
* @param aServoChildSheet the child stylesheet of the @import rule, when
* using Servo's style system.
* @param aSavedSheets any saved style sheets which could be reused
* for this load
*/
nsresult LoadChildSheet(StyleSheet* aParentSheet,
nsIURI* aURL,
nsMediaList* aMedia,
ImportRule* aGeckoParentRule,
const RawServoStyleSheet* aServoChildSheet,
LoaderReusableStyleSheets* aSavedSheets);
/**
* Synchronously load and return the stylesheet at aURL. Any child sheets
* will also be loaded synchronously. Note that synchronous loads over some
* protocols may involve spinning up a new event loop, so use of this method
* does NOT guarantee not receiving any events before the sheet loads. This
* method can be used to load sheets not associated with a document.
*
* @param aURL the URL of the sheet to load
* @param aParsingMode the mode in which to parse the sheet
* (see comments at enum SheetParsingMode, above).
* @param aUseSystemPrincipal if true, give the resulting sheet the system
* principal no matter where it's being loaded from.
* @param [out] aSheet the loaded, complete sheet.
*
* NOTE: At the moment, this method assumes the sheet will be UTF-8, but
* ideally it would allow arbitrary encodings. Callers should NOT depend on
* non-UTF8 sheets being treated as UTF-8 by this method.
*
* NOTE: A successful return from this method doesn't indicate anything about
* whether the data could be parsed as CSS and doesn't indicate anything
* about the status of child sheets of the returned sheet.
*/
nsresult LoadSheetSync(nsIURI* aURL,
SheetParsingMode aParsingMode,
bool aUseSystemPrincipal,
RefPtr<StyleSheet>* aSheet);
/**
* As above, but defaults aParsingMode to eAuthorSheetFeatures and
* aUseSystemPrincipal to false.
*/
nsresult LoadSheetSync(nsIURI* aURL, RefPtr<StyleSheet>* aSheet) {
return LoadSheetSync(aURL, eAuthorSheetFeatures, false, aSheet);
}
/**
* Asynchronously load the stylesheet at aURL. If a successful result is
* returned, aObserver is guaranteed to be notified asynchronously once the
* sheet is loaded and marked complete. This method can be used to load
* sheets not associated with a document.
*
* @param aURL the URL of the sheet to load
* @param aParsingMode the mode in which to parse the sheet
* (see comments at enum SheetParsingMode, above).
* @param aUseSystemPrincipal if true, give the resulting sheet the system
* principal no matter where it's being loaded from.
* @param aObserver the observer to notify when the load completes.
* Must not be null.
* @param [out] aSheet the sheet to load. Note that the sheet may well
* not be loaded by the time this method returns.
*
* NOTE: At the moment, this method assumes the sheet will be UTF-8, but
* ideally it would allow arbitrary encodings. Callers should NOT depend on
* non-UTF8 sheets being treated as UTF-8 by this method.
*/
nsresult LoadSheet(nsIURI* aURL,
SheetParsingMode aParsingMode,
bool aUseSystemPrincipal,
nsICSSLoaderObserver* aObserver,
RefPtr<StyleSheet>* aSheet);
/**
* Asynchronously load the stylesheet at aURL. If a successful result is
* returned, aObserver is guaranteed to be notified asynchronously once the
* sheet is loaded and marked complete. This method can be used to load
* sheets not associated with a document. This method cannot be used to
* load user or agent sheets.
*
* @param aURL the URL of the sheet to load
* @param aOriginPrincipal the principal to use for security checks. This
* can be null to indicate that these checks should
* be skipped.
* @param aCharset the encoding to use for converting the sheet data
* from bytes to Unicode. May be empty to indicate that the
* charset of the CSSLoader's document should be used. This
* is only used if neither the network transport nor the
* sheet itself indicate an encoding.
* @param aObserver the observer to notify when the load completes.
* Must not be null.
* @param [out] aSheet the sheet to load. Note that the sheet may well
* not be loaded by the time this method returns.
*/
nsresult LoadSheet(nsIURI* aURL,
nsIPrincipal* aOriginPrincipal,
const nsCString& aCharset,
nsICSSLoaderObserver* aObserver,
RefPtr<StyleSheet>* aSheet);
/**
* Same as above, to be used when the caller doesn't care about the
* not-yet-loaded sheet.
*/
nsresult LoadSheet(nsIURI* aURL,
bool aIsPreload,
nsIPrincipal* aOriginPrincipal,
const nsCString& aCharset,
nsICSSLoaderObserver* aObserver,
CORSMode aCORSMode = CORS_NONE,
ReferrerPolicy aReferrerPolicy = mozilla::net::RP_Unset,
const nsAString& aIntegrity = EmptyString());
/**
* Stop loading all sheets. All nsICSSLoaderObservers involved will be
* notified with NS_BINDING_ABORTED as the status, possibly synchronously.
*/
nsresult Stop(void);
/**
* nsresult Loader::StopLoadingSheet(nsIURI* aURL), which notifies the
* nsICSSLoaderObserver with NS_BINDING_ABORTED, was removed in Bug 556446.
* It can be found in revision 2c44a32052ad.
*/
/**
* Whether the loader is enabled or not.
* When disabled, processing of new styles is disabled and an attempt
* to do so will fail with a return code of
* NS_ERROR_NOT_AVAILABLE. Note that this DOES NOT disable
* currently loading styles or already processed styles.
*/
bool GetEnabled() { return mEnabled; }
void SetEnabled(bool aEnabled) { mEnabled = aEnabled; }
/**
* Get the document we live for. May return null.
*/
nsIDocument* GetDocument() const { return mDocument; }
/**
* Return true if this loader has pending loads (ones that would send
* notifications to an nsICSSLoaderObserver attached to this loader).
* If called from inside nsICSSLoaderObserver::StyleSheetLoaded, this will
* return false if and only if that is the last StyleSheetLoaded
* notification the CSSLoader knows it's going to send. In other words, if
* two sheets load at once (via load coalescing, e.g.), HasPendingLoads()
* will return true during notification for the first one, and false
* during notification for the second one.
*/
bool HasPendingLoads();
/**
* Add an observer to this loader. The observer will be notified
* for all loads that would have notified their own observers (even
* if those loads don't have observers attached to them).
* Load-specific observers will be notified before generic
* observers. The loader holds a reference to the observer.
*
* aObserver must not be null.
*/
nsresult AddObserver(nsICSSLoaderObserver* aObserver);
/**
* Remove an observer added via AddObserver.
*/
void RemoveObserver(nsICSSLoaderObserver* aObserver);
// These interfaces are public only for the benefit of static functions
// within nsCSSLoader.cpp.
// IsAlternate can change our currently selected style set if none
// is selected and aHasAlternateRel is false.
bool IsAlternate(const nsAString& aTitle, bool aHasAlternateRel);
typedef nsTArray<RefPtr<SheetLoadData> > LoadDataArray;
// Measure our size.
size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
// Marks all the sheets at the given URI obsolete, and removes them from the
// cache.
nsresult ObsoleteSheet(nsIURI* aURI);
private:
friend class SheetLoadData;
nsresult CheckContentPolicy(nsIPrincipal* aSourcePrincipal,
nsIURI* aTargetURI,
nsISupports* aContext,
bool aIsPreload);
// For inline style, the aURI param is null, but the aLinkingContent
// must be non-null then. The loader principal must never be null
// if aURI is not null.
// *aIsAlternate is set based on aTitle and aHasAlternateRel.
nsresult CreateSheet(nsIURI* aURI,
nsIContent* aLinkingContent,
nsIPrincipal* aLoaderPrincipal,
css::SheetParsingMode aParsingMode,
CORSMode aCORSMode,
ReferrerPolicy aReferrerPolicy,
const nsAString& aIntegrity,
bool aSyncLoad,
bool aHasAlternateRel,
const nsAString& aTitle,
StyleSheetState& aSheetState,
bool *aIsAlternate,
RefPtr<StyleSheet>* aSheet);
// Pass in either a media string or the nsMediaList from the
// CSSParser. Don't pass both.
// This method will set the sheet's enabled state based on aIsAlternate
void PrepareSheet(StyleSheet* aSheet,
const nsAString& aTitle,
const nsAString& aMediaString,
nsMediaList* aMediaList,
dom::Element* aScopeElement,
bool aIsAlternate);
nsresult InsertSheetInDoc(StyleSheet* aSheet,
nsIContent* aLinkingContent,
nsIDocument* aDocument);
nsresult InsertChildSheet(StyleSheet* aSheet,
StyleSheet* aParentSheet,
ImportRule* aGeckoParentRule,
const RawServoStyleSheet* aServoChildSheet);
nsresult InternalLoadNonDocumentSheet(nsIURI* aURL,
bool aIsPreload,
SheetParsingMode aParsingMode,
bool aUseSystemPrincipal,
nsIPrincipal* aOriginPrincipal,
const nsCString& aCharset,
RefPtr<StyleSheet>* aSheet,
nsICSSLoaderObserver* aObserver,
CORSMode aCORSMode = CORS_NONE,
ReferrerPolicy aReferrerPolicy = mozilla::net::RP_Unset,
const nsAString& aIntegrity = EmptyString());
// Post a load event for aObserver to be notified about aSheet. The
// notification will be sent with status NS_OK unless the load event is
// canceled at some point (in which case it will be sent with
// NS_BINDING_ABORTED). aWasAlternate indicates the state when the load was
// initiated, not the state at some later time. aURI should be the URI the
// sheet was loaded from (may be null for inline sheets). aElement is the
// owning element for this sheet.
nsresult PostLoadEvent(nsIURI* aURI,
StyleSheet* aSheet,
nsICSSLoaderObserver* aObserver,
bool aWasAlternate,
nsIStyleSheetLinkingElement* aElement);
// Start the loads of all the sheets in mPendingDatas
void StartAlternateLoads();
// Handle an event posted by PostLoadEvent
void HandleLoadEvent(SheetLoadData* aEvent);
// Note: LoadSheet is responsible for releasing aLoadData and setting the
// sheet to complete on failure.
nsresult LoadSheet(SheetLoadData* aLoadData,
StyleSheetState aSheetState,
bool aIsPreLoad);
// Parse the stylesheet in aLoadData. The sheet data comes from aInput.
// Set aCompleted to true if the parse finished, false otherwise (e.g. if the
// sheet had an @import). If aCompleted is true when this returns, then
// ParseSheet also called SheetComplete on aLoadData.
nsresult ParseSheet(const nsAString& aInput,
SheetLoadData* aLoadData,
bool& aCompleted);
// The load of the sheet in aLoadData is done, one way or another. Do final
// cleanup, including releasing aLoadData.
void SheetComplete(SheetLoadData* aLoadData, nsresult aStatus);
// The guts of SheetComplete. This may be called recursively on parent datas
// or datas that had glommed on to a single load. The array is there so load
// datas whose observers need to be notified can be added to it.
void DoSheetComplete(SheetLoadData* aLoadData, nsresult aStatus,
LoadDataArray& aDatasToNotify);
StyleBackendType GetStyleBackendType() const;
struct Sheets {
nsBaseHashtable<URIPrincipalReferrerPolicyAndCORSModeHashKey,
RefPtr<StyleSheet>,
StyleSheet*> mCompleteSheets;
nsDataHashtable<URIPrincipalReferrerPolicyAndCORSModeHashKey, SheetLoadData*>
mLoadingDatas; // weak refs
nsDataHashtable<URIPrincipalReferrerPolicyAndCORSModeHashKey, SheetLoadData*>
mPendingDatas; // weak refs
};
nsAutoPtr<Sheets> mSheets;
// We're not likely to have many levels of @import... But likely to have
// some. Allocate some storage, what the hell.
AutoTArray<SheetLoadData*, 8> mParsingDatas;
// The array of posted stylesheet loaded events (SheetLoadDatas) we have.
// Note that these are rare.
LoadDataArray mPostedEvents;
// Our array of "global" observers
nsTObserverArray<nsCOMPtr<nsICSSLoaderObserver> > mObservers;
// This reference is nulled by the Document in it's destructor through
// DropDocumentReference().
nsIDocument* MOZ_NON_OWNING_REF mDocument; // the document we live for
// For dispatching events via DocGroup::Dispatch() when mDocument is nullptr.
RefPtr<mozilla::dom::DocGroup> mDocGroup;
// Number of datas still waiting to be notified on if we're notifying on a
// whole bunch at once (e.g. in one of the stop methods). This is used to
// make sure that HasPendingLoads() won't return false until we're notifying
// on the last data we're working with.
uint32_t mDatasToNotifyOn;
nsCompatibility mCompatMode;
nsString mPreferredSheet; // title of preferred sheet
// Set explicitly when the Loader(StyleBackendType) constructor is used, or
// taken from the document when the Loader(nsIDocument*) constructor is used.
mozilla::Maybe<StyleBackendType> mStyleBackendType;
bool mEnabled; // is enabled to load new styles
nsCOMPtr<nsIConsoleReportCollector> mReporter;
#ifdef DEBUG
bool mSyncCallback;
#endif
};
} // namespace css
} // namespace mozilla
#endif /* mozilla_css_Loader_h */
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