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/* 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 */
#ifndef PreloadHashKey_h__
#define PreloadHashKey_h__
#include "mozilla/CORSMode.h"
#include "mozilla/css/SheetParsingMode.h"
#include "mozilla/dom/ScriptKind.h"
#include "nsURIHashKey.h"
class nsIPrincipal;
namespace mozilla {
namespace css {
class SheetLoadData;
* This key is used for coalescing and lookup of preloading or regular
* speculative loads. It consists of:
* - the resource type, which is the value of the 'as' attribute
* - the URI of the resource
* - set of attributes that is common to all resource types
* - resource-type-specific attributes that we use to distinguish loads that has
* to be treated separately, some of these attributes may remain at their
* default values
class PreloadHashKey : public nsURIHashKey {
enum class ResourceType : uint8_t { NONE, SCRIPT, STYLE, IMAGE, FONT, FETCH };
using KeyType = const PreloadHashKey&;
using KeyTypePointer = const PreloadHashKey*;
PreloadHashKey() = default;
PreloadHashKey(const nsIURI* aKey, ResourceType aAs);
explicit PreloadHashKey(const PreloadHashKey* aKey);
PreloadHashKey(PreloadHashKey&& aToMove);
PreloadHashKey& operator=(const PreloadHashKey& aOther);
// Construct key for "script"
static PreloadHashKey CreateAsScript(nsIURI* aURI, CORSMode aCORSMode,
dom::ScriptKind aScriptKind);
static PreloadHashKey CreateAsScript(nsIURI* aURI,
const nsAString& aCrossOrigin,
const nsAString& aType);
// Construct key for "style"
static PreloadHashKey CreateAsStyle(nsIURI* aURI, nsIPrincipal* aPrincipal,
css::SheetParsingMode aParsingMode);
static PreloadHashKey CreateAsStyle(css::SheetLoadData&);
// Construct key for "image"
static PreloadHashKey CreateAsImage(nsIURI* aURI, nsIPrincipal* aPrincipal,
CORSMode aCORSMode);
// Construct key for "fetch"
static PreloadHashKey CreateAsFetch(nsIURI* aURI, CORSMode aCORSMode);
static PreloadHashKey CreateAsFetch(nsIURI* aURI,
const nsAString& aCrossOrigin);
// Construct key for "font"
static PreloadHashKey CreateAsFont(nsIURI* aURI, CORSMode aCORSMode);
KeyType GetKey() const { return *this; }
KeyTypePointer GetKeyPointer() const { return this; }
static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
bool KeyEquals(KeyTypePointer aOther) const;
static PLDHashNumber HashKey(KeyTypePointer aKey);
ResourceType As() const { return mAs; }
size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
return 0;
enum { ALLOW_MEMMOVE = true };
// Attributes common to all resource types
ResourceType mAs = ResourceType::NONE;
nsCOMPtr<nsIPrincipal> mPrincipal;
struct {
dom::ScriptKind mScriptKind = dom::ScriptKind::eClassic;
} mScript;
struct {
css::SheetParsingMode mParsingMode = css::eAuthorSheetFeatures;
} mStyle;
} // namespace mozilla