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/* -*- 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 "LoadedScript.h"
#include "mozilla/HoldDropJSObjects.h"
#include "jsfriendapi.h"
#include "js/Modules.h" // JS::{Get,Set}ModulePrivate
namespace JS::loader {
//////////////////////////////////////////////////////////////
// LoadedScript
//////////////////////////////////////////////////////////////
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(LoadedScript)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTION_CLASS(LoadedScript)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(LoadedScript)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mFetchOptions)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mBaseURL)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(LoadedScript)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFetchOptions)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(LoadedScript)
NS_IMPL_CYCLE_COLLECTING_RELEASE(LoadedScript)
LoadedScript::LoadedScript(ScriptKind aKind, ScriptFetchOptions* aFetchOptions,
nsIURI* aBaseURL)
: mKind(aKind), mFetchOptions(aFetchOptions), mBaseURL(aBaseURL) {
MOZ_ASSERT(mFetchOptions);
MOZ_ASSERT(mBaseURL);
}
LoadedScript::~LoadedScript() { mozilla::DropJSObjects(this); }
void LoadedScript::AssociateWithScript(JSScript* aScript) {
// Set a JSScript's private value to point to this object. The JS engine will
// increment our reference count by calling HostAddRefTopLevelScript(). This
// is decremented by HostReleaseTopLevelScript() below when the JSScript dies.
MOZ_ASSERT(JS::GetScriptPrivate(aScript).isUndefined());
JS::SetScriptPrivate(aScript, JS::PrivateValue(this));
}
inline void CheckModuleScriptPrivate(LoadedScript* script,
const JS::Value& aPrivate) {
#ifdef DEBUG
if (script->IsModuleScript()) {
JSObject* module = script->AsModuleScript()->mModuleRecord.unbarrieredGet();
MOZ_ASSERT_IF(module, JS::GetModulePrivate(module) == aPrivate);
}
#endif
}
void HostAddRefTopLevelScript(const JS::Value& aPrivate) {
// Increment the reference count of a LoadedScript object that is now pointed
// to by a JSScript. The reference count is decremented by
// HostReleaseTopLevelScript() below.
auto script = static_cast<LoadedScript*>(aPrivate.toPrivate());
CheckModuleScriptPrivate(script, aPrivate);
script->AddRef();
}
void HostReleaseTopLevelScript(const JS::Value& aPrivate) {
// Decrement the reference count of a LoadedScript object that was pointed to
// by a JSScript. The reference count was originally incremented by
// HostAddRefTopLevelScript() above.
auto script = static_cast<LoadedScript*>(aPrivate.toPrivate());
CheckModuleScriptPrivate(script, aPrivate);
script->Release();
}
//////////////////////////////////////////////////////////////
// EventScript
//////////////////////////////////////////////////////////////
EventScript::EventScript(ScriptFetchOptions* aFetchOptions, nsIURI* aBaseURL)
: LoadedScript(ScriptKind::eEvent, aFetchOptions, aBaseURL) {}
//////////////////////////////////////////////////////////////
// ClassicScript
//////////////////////////////////////////////////////////////
ClassicScript::ClassicScript(ScriptFetchOptions* aFetchOptions,
nsIURI* aBaseURL)
: LoadedScript(ScriptKind::eClassic, aFetchOptions, aBaseURL) {}
//////////////////////////////////////////////////////////////
// ModuleScript
//////////////////////////////////////////////////////////////
NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(ModuleScript, LoadedScript)
NS_IMPL_CYCLE_COLLECTION_CLASS(ModuleScript)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(ModuleScript, LoadedScript)
tmp->UnlinkModuleRecord();
tmp->mParseError.setUndefined();
tmp->mErrorToRethrow.setUndefined();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ModuleScript, LoadedScript)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(ModuleScript, LoadedScript)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mModuleRecord)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mParseError)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mErrorToRethrow)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
ModuleScript::ModuleScript(ScriptFetchOptions* aFetchOptions, nsIURI* aBaseURL)
: LoadedScript(ScriptKind::eModule, aFetchOptions, aBaseURL),
mDebuggerDataInitialized(false) {
MOZ_ASSERT(!ModuleRecord());
MOZ_ASSERT(!HasParseError());
MOZ_ASSERT(!HasErrorToRethrow());
}
void ModuleScript::Shutdown() {
if (mModuleRecord) {
JS::ClearModuleEnvironment(mModuleRecord);
}
UnlinkModuleRecord();
}
void ModuleScript::UnlinkModuleRecord() {
// Remove the module record's pointer to this object if present and decrement
// our reference count. The reference is added by SetModuleRecord() below.
//
// This takes care not to trigger gray unmarking because this takes a lot of
// time when we're tearing down the entire page. This is safe because we are
// only writing undefined into the module private, so it won't create any
// black-gray edges.
if (mModuleRecord) {
JSObject* module = mModuleRecord.unbarrieredGet();
MOZ_ASSERT(JS::GetModulePrivate(module).toPrivate() == this);
JS::ClearModulePrivate(module);
mModuleRecord = nullptr;
}
}
ModuleScript::~ModuleScript() {
// The object may be destroyed without being unlinked first.
UnlinkModuleRecord();
}
void ModuleScript::SetModuleRecord(JS::Handle<JSObject*> aModuleRecord) {
MOZ_ASSERT(!mModuleRecord);
MOZ_ASSERT_IF(IsModuleScript(), !AsModuleScript()->HasParseError());
MOZ_ASSERT_IF(IsModuleScript(), !AsModuleScript()->HasErrorToRethrow());
mModuleRecord = aModuleRecord;
// Make module's host defined field point to this object. The JS engine will
// increment our reference count by calling HostAddRefTopLevelScript(). This
// is decremented when the field is cleared in UnlinkModuleRecord() above or
// when the module record dies.
MOZ_ASSERT(JS::GetModulePrivate(mModuleRecord).isUndefined());
JS::SetModulePrivate(mModuleRecord, JS::PrivateValue(this));
mozilla::HoldJSObjects(this);
}
void ModuleScript::SetParseError(const JS::Value& aError) {
MOZ_ASSERT(!aError.isUndefined());
MOZ_ASSERT(!HasParseError());
MOZ_ASSERT(!HasErrorToRethrow());
UnlinkModuleRecord();
mParseError = aError;
mozilla::HoldJSObjects(this);
}
void ModuleScript::SetErrorToRethrow(const JS::Value& aError) {
MOZ_ASSERT(!aError.isUndefined());
// This is only called after SetModuleRecord() or SetParseError() so we don't
// need to call HoldJSObjects() here.
MOZ_ASSERT(ModuleRecord() || HasParseError());
mErrorToRethrow = aError;
}
void ModuleScript::SetDebuggerDataInitialized() {
MOZ_ASSERT(ModuleRecord());
MOZ_ASSERT(!mDebuggerDataInitialized);
mDebuggerDataInitialized = true;
}
} // namespace JS::loader
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