gecko/dom/xbl/nsXBLProtoImplProperty.cpp
2015-05-03 15:32:37 -04:00

376 lines
12 KiB
C++

/* -*- 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 "nsIAtom.h"
#include "nsString.h"
#include "jsapi.h"
#include "nsIContent.h"
#include "nsXBLProtoImplProperty.h"
#include "nsUnicharUtils.h"
#include "nsReadableUtils.h"
#include "nsJSUtils.h"
#include "nsXBLPrototypeBinding.h"
#include "nsXBLSerialize.h"
#include "xpcpublic.h"
using namespace mozilla;
using namespace mozilla::dom;
nsXBLProtoImplProperty::nsXBLProtoImplProperty(const char16_t* aName,
const char16_t* aGetter,
const char16_t* aSetter,
const char16_t* aReadOnly,
uint32_t aLineNumber) :
nsXBLProtoImplMember(aName),
mJSAttributes(JSPROP_ENUMERATE)
#ifdef DEBUG
, mIsCompiled(false)
#endif
{
MOZ_COUNT_CTOR(nsXBLProtoImplProperty);
if (aReadOnly) {
nsAutoString readOnly; readOnly.Assign(*aReadOnly);
if (readOnly.LowerCaseEqualsLiteral("true"))
mJSAttributes |= JSPROP_READONLY;
}
if (aGetter) {
AppendGetterText(nsDependentString(aGetter));
SetGetterLineNumber(aLineNumber);
}
if (aSetter) {
AppendSetterText(nsDependentString(aSetter));
SetSetterLineNumber(aLineNumber);
}
}
nsXBLProtoImplProperty::nsXBLProtoImplProperty(const char16_t* aName,
const bool aIsReadOnly)
: nsXBLProtoImplMember(aName),
mJSAttributes(JSPROP_ENUMERATE)
#ifdef DEBUG
, mIsCompiled(false)
#endif
{
MOZ_COUNT_CTOR(nsXBLProtoImplProperty);
if (aIsReadOnly)
mJSAttributes |= JSPROP_READONLY;
}
nsXBLProtoImplProperty::~nsXBLProtoImplProperty()
{
MOZ_COUNT_DTOR(nsXBLProtoImplProperty);
if (!mGetter.IsCompiled()) {
delete mGetter.GetUncompiled();
}
if (!mSetter.IsCompiled()) {
delete mSetter.GetUncompiled();
}
}
void nsXBLProtoImplProperty::EnsureUncompiledText(PropertyOp& aPropertyOp)
{
if (!aPropertyOp.GetUncompiled()) {
nsXBLTextWithLineNumber* text = new nsXBLTextWithLineNumber();
aPropertyOp.SetUncompiled(text);
}
}
void
nsXBLProtoImplProperty::AppendGetterText(const nsAString& aText)
{
NS_PRECONDITION(!mIsCompiled,
"Must not be compiled when accessing getter text");
EnsureUncompiledText(mGetter);
mGetter.GetUncompiled()->AppendText(aText);
}
void
nsXBLProtoImplProperty::AppendSetterText(const nsAString& aText)
{
NS_PRECONDITION(!mIsCompiled,
"Must not be compiled when accessing setter text");
EnsureUncompiledText(mSetter);
mSetter.GetUncompiled()->AppendText(aText);
}
void
nsXBLProtoImplProperty::SetGetterLineNumber(uint32_t aLineNumber)
{
NS_PRECONDITION(!mIsCompiled,
"Must not be compiled when accessing getter text");
EnsureUncompiledText(mGetter);
mGetter.GetUncompiled()->SetLineNumber(aLineNumber);
}
void
nsXBLProtoImplProperty::SetSetterLineNumber(uint32_t aLineNumber)
{
NS_PRECONDITION(!mIsCompiled,
"Must not be compiled when accessing setter text");
EnsureUncompiledText(mSetter);
mSetter.GetUncompiled()->SetLineNumber(aLineNumber);
}
const char* gPropertyArgs[] = { "val" };
nsresult
nsXBLProtoImplProperty::InstallMember(JSContext *aCx,
JS::Handle<JSObject*> aTargetClassObject)
{
NS_PRECONDITION(mIsCompiled,
"Should not be installing an uncompiled property");
MOZ_ASSERT(mGetter.IsCompiled() && mSetter.IsCompiled());
MOZ_ASSERT(js::IsObjectInContextCompartment(aTargetClassObject, aCx));
#ifdef DEBUG
{
JS::Rooted<JSObject*> globalObject(aCx, JS_GetGlobalForObject(aCx, aTargetClassObject));
MOZ_ASSERT(xpc::IsInContentXBLScope(globalObject) ||
xpc::IsInAddonScope(globalObject) ||
globalObject == xpc::GetXBLScope(aCx, globalObject));
MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx) == globalObject);
}
#endif
JS::Rooted<JSObject*> getter(aCx, mGetter.GetJSFunction());
JS::Rooted<JSObject*> setter(aCx, mSetter.GetJSFunction());
if (getter || setter) {
if (getter) {
if (!(getter = JS::CloneFunctionObject(aCx, getter)))
return NS_ERROR_OUT_OF_MEMORY;
}
if (setter) {
if (!(setter = JS::CloneFunctionObject(aCx, setter)))
return NS_ERROR_OUT_OF_MEMORY;
}
nsDependentString name(mName);
if (!::JS_DefineUCProperty(aCx, aTargetClassObject,
static_cast<const char16_t*>(mName),
name.Length(), JS::UndefinedHandleValue, mJSAttributes,
JS_DATA_TO_FUNC_PTR(JSNative, getter.get()),
JS_DATA_TO_FUNC_PTR(JSNative, setter.get())))
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
nsresult
nsXBLProtoImplProperty::CompileMember(AutoJSAPI& jsapi, const nsString& aClassStr,
JS::Handle<JSObject*> aClassObject)
{
AssertInCompilationScope();
NS_PRECONDITION(!mIsCompiled,
"Trying to compile an already-compiled property");
NS_PRECONDITION(aClassObject,
"Must have class object to compile");
MOZ_ASSERT(!mGetter.IsCompiled() && !mSetter.IsCompiled());
JSContext *cx = jsapi.cx();
if (!mName)
return NS_ERROR_FAILURE; // Without a valid name, we can't install the member.
// We have a property.
nsresult rv = NS_OK;
nsAutoCString functionUri;
if (mGetter.GetUncompiled() || mSetter.GetUncompiled()) {
functionUri = NS_ConvertUTF16toUTF8(aClassStr);
int32_t hash = functionUri.RFindChar('#');
if (hash != kNotFound) {
functionUri.Truncate(hash);
}
}
bool deletedGetter = false;
nsXBLTextWithLineNumber *getterText = mGetter.GetUncompiled();
if (getterText && getterText->GetText()) {
nsDependentString getter(getterText->GetText());
if (!getter.IsEmpty()) {
JSAutoCompartment ac(cx, aClassObject);
JS::CompileOptions options(cx);
options.setFileAndLine(functionUri.get(), getterText->GetLineNumber())
.setVersion(JSVERSION_LATEST);
nsCString name = NS_LITERAL_CSTRING("get_") + NS_ConvertUTF16toUTF8(mName);
JS::Rooted<JSObject*> getterObject(cx);
JS::AutoObjectVector emptyVector(cx);
rv = nsJSUtils::CompileFunction(jsapi, emptyVector, options, name, 0,
nullptr, getter, getterObject.address());
delete getterText;
deletedGetter = true;
mGetter.SetJSFunction(getterObject);
if (mGetter.GetJSFunction() && NS_SUCCEEDED(rv)) {
mJSAttributes |= JSPROP_GETTER | JSPROP_SHARED;
}
if (NS_FAILED(rv)) {
mGetter.SetJSFunction(nullptr);
mJSAttributes &= ~JSPROP_GETTER;
/*chaining to return failure*/
}
}
} // if getter is not empty
if (!deletedGetter) { // Empty getter
delete getterText;
mGetter.SetJSFunction(nullptr);
}
if (NS_FAILED(rv)) {
// We failed to compile our getter. So either we've set it to null, or
// it's still set to the text object. In either case, it's safe to return
// the error here, since then we'll be cleaned up as uncompiled and that
// will be ok. Going on and compiling the setter and _then_ returning an
// error, on the other hand, will try to clean up a compiled setter as
// uncompiled and crash.
return rv;
}
bool deletedSetter = false;
nsXBLTextWithLineNumber *setterText = mSetter.GetUncompiled();
if (setterText && setterText->GetText()) {
nsDependentString setter(setterText->GetText());
if (!setter.IsEmpty()) {
JSAutoCompartment ac(cx, aClassObject);
JS::CompileOptions options(cx);
options.setFileAndLine(functionUri.get(), setterText->GetLineNumber())
.setVersion(JSVERSION_LATEST);
nsCString name = NS_LITERAL_CSTRING("set_") + NS_ConvertUTF16toUTF8(mName);
JS::Rooted<JSObject*> setterObject(cx);
JS::AutoObjectVector emptyVector(cx);
rv = nsJSUtils::CompileFunction(jsapi, emptyVector, options, name, 1,
gPropertyArgs, setter,
setterObject.address());
delete setterText;
deletedSetter = true;
mSetter.SetJSFunction(setterObject);
if (mSetter.GetJSFunction() && NS_SUCCEEDED(rv)) {
mJSAttributes |= JSPROP_SETTER | JSPROP_SHARED;
}
if (NS_FAILED(rv)) {
mSetter.SetJSFunction(nullptr);
mJSAttributes &= ~JSPROP_SETTER;
/*chaining to return failure*/
}
}
} // if setter wasn't empty....
if (!deletedSetter) { // Empty setter
delete setterText;
mSetter.SetJSFunction(nullptr);
}
#ifdef DEBUG
mIsCompiled = NS_SUCCEEDED(rv);
#endif
return rv;
}
void
nsXBLProtoImplProperty::Trace(const TraceCallbacks& aCallbacks, void *aClosure)
{
if (mJSAttributes & JSPROP_GETTER) {
aCallbacks.Trace(&mGetter.AsHeapObject(), "mGetter", aClosure);
}
if (mJSAttributes & JSPROP_SETTER) {
aCallbacks.Trace(&mSetter.AsHeapObject(), "mSetter", aClosure);
}
}
nsresult
nsXBLProtoImplProperty::Read(nsIObjectInputStream* aStream,
XBLBindingSerializeDetails aType)
{
AssertInCompilationScope();
MOZ_ASSERT(!mIsCompiled);
MOZ_ASSERT(!mGetter.GetUncompiled() && !mSetter.GetUncompiled());
AutoJSContext cx;
JS::Rooted<JSObject*> getterObject(cx);
if (aType == XBLBinding_Serialize_GetterProperty ||
aType == XBLBinding_Serialize_GetterSetterProperty) {
nsresult rv = XBL_DeserializeFunction(aStream, &getterObject);
NS_ENSURE_SUCCESS(rv, rv);
mJSAttributes |= JSPROP_GETTER | JSPROP_SHARED;
}
mGetter.SetJSFunction(getterObject);
JS::Rooted<JSObject*> setterObject(cx);
if (aType == XBLBinding_Serialize_SetterProperty ||
aType == XBLBinding_Serialize_GetterSetterProperty) {
nsresult rv = XBL_DeserializeFunction(aStream, &setterObject);
NS_ENSURE_SUCCESS(rv, rv);
mJSAttributes |= JSPROP_SETTER | JSPROP_SHARED;
}
mSetter.SetJSFunction(setterObject);
#ifdef DEBUG
mIsCompiled = true;
#endif
return NS_OK;
}
nsresult
nsXBLProtoImplProperty::Write(nsIObjectOutputStream* aStream)
{
AssertInCompilationScope();
XBLBindingSerializeDetails type;
if (mJSAttributes & JSPROP_GETTER) {
type = mJSAttributes & JSPROP_SETTER ?
XBLBinding_Serialize_GetterSetterProperty :
XBLBinding_Serialize_GetterProperty;
}
else {
type = XBLBinding_Serialize_SetterProperty;
}
if (mJSAttributes & JSPROP_READONLY) {
type |= XBLBinding_Serialize_ReadOnly;
}
nsresult rv = aStream->Write8(type);
NS_ENSURE_SUCCESS(rv, rv);
rv = aStream->WriteWStringZ(mName);
NS_ENSURE_SUCCESS(rv, rv);
// The calls to fromMarkedLocation() below are safe because mSetter and
// mGetter are traced by the Trace() method above, and because their values
// are never changed after they have been set to a compiled function.
MOZ_ASSERT_IF(mJSAttributes & (JSPROP_GETTER | JSPROP_SETTER), mIsCompiled);
if (mJSAttributes & JSPROP_GETTER) {
JS::Handle<JSObject*> function =
JS::Handle<JSObject*>::fromMarkedLocation(mGetter.AsHeapObject().address());
rv = XBL_SerializeFunction(aStream, function);
NS_ENSURE_SUCCESS(rv, rv);
}
if (mJSAttributes & JSPROP_SETTER) {
JS::Handle<JSObject*> function =
JS::Handle<JSObject*>::fromMarkedLocation(mSetter.AsHeapObject().address());
rv = XBL_SerializeFunction(aStream, function);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}