gecko/dom/base/nsJSTimeoutHandler.cpp
2012-07-30 17:20:58 +03:00

343 lines
9.8 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=78: */
/* 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 "nsCOMPtr.h"
#include "nsIScriptContext.h"
#include "nsIArray.h"
#include "nsIScriptTimeoutHandler.h"
#include "nsIXPConnect.h"
#include "nsIJSRuntimeService.h"
#include "nsJSUtils.h"
#include "nsDOMJSUtils.h"
#include "nsContentUtils.h"
#include "nsJSEnvironment.h"
#include "nsServiceManagerUtils.h"
#include "nsDOMError.h"
#include "nsGlobalWindow.h"
#include "nsIContentSecurityPolicy.h"
#include "nsAlgorithm.h"
#include "mozilla/Attributes.h"
static const char kSetIntervalStr[] = "setInterval";
static const char kSetTimeoutStr[] = "setTimeout";
// Our JS nsIScriptTimeoutHandler implementation.
class nsJSScriptTimeoutHandler MOZ_FINAL : public nsIScriptTimeoutHandler
{
public:
// nsISupports
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsJSScriptTimeoutHandler)
nsJSScriptTimeoutHandler();
~nsJSScriptTimeoutHandler();
virtual const PRUnichar *GetHandlerText();
virtual JSObject *GetScriptObject() {
return mFunObj;
}
virtual void GetLocation(const char **aFileName, PRUint32 *aLineNo) {
*aFileName = mFileName.get();
*aLineNo = mLineNo;
}
virtual nsIArray *GetArgv() {
return mArgv;
}
nsresult Init(nsGlobalWindow *aWindow, bool *aIsInterval,
PRInt32 *aInterval);
void ReleaseJSObjects();
private:
nsCOMPtr<nsIScriptContext> mContext;
// filename, line number and JS language version string of the
// caller of setTimeout()
nsCString mFileName;
PRUint32 mLineNo;
nsCOMPtr<nsIJSArgArray> mArgv;
// The JS expression to evaluate or function to call, if !mExpr
JSFlatString *mExpr;
JSObject *mFunObj;
};
// nsJSScriptTimeoutHandler
// QueryInterface implementation for nsJSScriptTimeoutHandler
NS_IMPL_CYCLE_COLLECTION_CLASS(nsJSScriptTimeoutHandler)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsJSScriptTimeoutHandler)
tmp->ReleaseJSObjects();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(nsJSScriptTimeoutHandler)
if (NS_UNLIKELY(cb.WantDebugInfo())) {
nsCAutoString foo("nsJSScriptTimeoutHandler");
if (tmp->mExpr) {
foo.AppendLiteral(" [");
foo.Append(tmp->mFileName);
foo.AppendLiteral(":");
foo.AppendInt(tmp->mLineNo);
foo.AppendLiteral("]");
}
else if (tmp->mFunObj) {
JSFunction* fun = JS_GetObjectFunction(tmp->mFunObj);
if (fun && JS_GetFunctionId(fun)) {
JSFlatString *funId = JS_ASSERT_STRING_IS_FLAT(JS_GetFunctionId(fun));
size_t size = 1 + JS_PutEscapedFlatString(NULL, 0, funId, 0);
char *name = new char[size];
if (name) {
JS_PutEscapedFlatString(name, size, funId, 0);
foo.AppendLiteral(" [");
foo.Append(name);
delete[] name;
foo.AppendLiteral("]");
}
}
}
cb.DescribeRefCountedNode(tmp->mRefCnt.get(),
sizeof(nsJSScriptTimeoutHandler), foo.get());
}
else {
NS_IMPL_CYCLE_COLLECTION_DESCRIBE(nsJSScriptTimeoutHandler,
tmp->mRefCnt.get())
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mContext)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mArgv)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsJSScriptTimeoutHandler)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mExpr)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mFunObj)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsJSScriptTimeoutHandler)
NS_INTERFACE_MAP_ENTRY(nsIScriptTimeoutHandler)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsJSScriptTimeoutHandler)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsJSScriptTimeoutHandler)
nsJSScriptTimeoutHandler::nsJSScriptTimeoutHandler() :
mLineNo(0),
mExpr(nullptr),
mFunObj(nullptr)
{
}
nsJSScriptTimeoutHandler::~nsJSScriptTimeoutHandler()
{
ReleaseJSObjects();
}
void
nsJSScriptTimeoutHandler::ReleaseJSObjects()
{
if (mExpr || mFunObj) {
if (mExpr) {
NS_DROP_JS_OBJECTS(this, nsJSScriptTimeoutHandler);
mExpr = nullptr;
} else if (mFunObj) {
NS_DROP_JS_OBJECTS(this, nsJSScriptTimeoutHandler);
mFunObj = nullptr;
} else {
NS_WARNING("No func and no expr - roots may not have been removed");
}
}
}
nsresult
nsJSScriptTimeoutHandler::Init(nsGlobalWindow *aWindow, bool *aIsInterval,
PRInt32 *aInterval)
{
mContext = aWindow->GetContextInternal();
if (!mContext) {
// This window was already closed, or never properly initialized,
// don't let a timer be scheduled on such a window.
return NS_ERROR_NOT_INITIALIZED;
}
nsAXPCNativeCallContext *ncc = nullptr;
nsresult rv = nsContentUtils::XPConnect()->
GetCurrentNativeCallContext(&ncc);
NS_ENSURE_SUCCESS(rv, rv);
if (!ncc)
return NS_ERROR_NOT_AVAILABLE;
JSContext *cx = nullptr;
rv = ncc->GetJSContext(&cx);
NS_ENSURE_SUCCESS(rv, rv);
PRUint32 argc;
jsval *argv = nullptr;
ncc->GetArgc(&argc);
ncc->GetArgvPtr(&argv);
JSFlatString *expr = nullptr;
JSObject *funobj = nullptr;
JSAutoRequest ar(cx);
if (argc < 1) {
::JS_ReportError(cx, "Function %s requires at least 2 parameter",
*aIsInterval ? kSetIntervalStr : kSetTimeoutStr);
return NS_ERROR_DOM_TYPE_ERR;
}
int32_t interval = 0;
if (argc > 1 && !::JS_ValueToECMAInt32(cx, argv[1], &interval)) {
::JS_ReportError(cx,
"Second argument to %s must be a millisecond interval",
aIsInterval ? kSetIntervalStr : kSetTimeoutStr);
return NS_ERROR_DOM_TYPE_ERR;
}
if (argc == 1) {
// If no interval was specified, treat this like a timeout, to avoid
// setting an interval of 0 milliseconds.
*aIsInterval = false;
}
switch (::JS_TypeOfValue(cx, argv[0])) {
case JSTYPE_FUNCTION:
funobj = JSVAL_TO_OBJECT(argv[0]);
break;
case JSTYPE_STRING:
case JSTYPE_OBJECT:
{
JSString *str = ::JS_ValueToString(cx, argv[0]);
if (!str)
return NS_ERROR_OUT_OF_MEMORY;
expr = ::JS_FlattenString(cx, str);
if (!expr)
return NS_ERROR_OUT_OF_MEMORY;
argv[0] = STRING_TO_JSVAL(str);
}
break;
default:
::JS_ReportError(cx, "useless %s call (missing quotes around argument?)",
*aIsInterval ? kSetIntervalStr : kSetTimeoutStr);
// Return an error that nsGlobalWindow can recognize and turn into NS_OK.
return NS_ERROR_DOM_TYPE_ERR;
}
if (expr) {
// if CSP is enabled, and setTimeout/setInterval was called with a string
// or object, disable the registration and log an error
nsCOMPtr<nsIDocument> doc = do_QueryInterface(aWindow->GetExtantDocument());
if (doc) {
nsCOMPtr<nsIContentSecurityPolicy> csp;
nsresult rv = doc->NodePrincipal()->GetCsp(getter_AddRefs(csp));
NS_ENSURE_SUCCESS(rv, rv);
if (csp) {
bool allowsEval;
// this call will send violation reports as warranted (and return true if
// reportOnly is set).
rv = csp->GetAllowsEval(&allowsEval);
NS_ENSURE_SUCCESS(rv, rv);
if (!allowsEval) {
::JS_ReportError(cx, "call to %s blocked by CSP",
*aIsInterval ? kSetIntervalStr : kSetTimeoutStr);
// Note: Our only caller knows to turn NS_ERROR_DOM_TYPE_ERR into NS_OK.
return NS_ERROR_DOM_TYPE_ERR;
}
}
} // if there's no document, we don't have to do anything.
rv = NS_HOLD_JS_OBJECTS(this, nsJSScriptTimeoutHandler);
NS_ENSURE_SUCCESS(rv, rv);
mExpr = expr;
// Get the calling location.
const char *filename;
if (nsJSUtils::GetCallingLocation(cx, &filename, &mLineNo)) {
mFileName.Assign(filename);
}
} else if (funobj) {
rv = NS_HOLD_JS_OBJECTS(this, nsJSScriptTimeoutHandler);
NS_ENSURE_SUCCESS(rv, rv);
mFunObj = funobj;
// Create our arg array. argc is the number of arguments passed
// to setTimeout or setInterval; the first two are our callback
// and the delay, so only arguments after that need to go in our
// array.
nsCOMPtr<nsIJSArgArray> array;
// NS_MAX(argc - 2, 0) wouldn't work right because argc is unsigned.
rv = NS_CreateJSArgv(cx, NS_MAX(argc, 2u) - 2, nullptr,
getter_AddRefs(array));
if (NS_FAILED(rv)) {
return NS_ERROR_OUT_OF_MEMORY;
}
PRUint32 dummy;
jsval *jsargv = nullptr;
array->GetArgs(&dummy, reinterpret_cast<void **>(&jsargv));
// jsargv might be null if we have argc <= 2
if (jsargv) {
for (PRInt32 i = 2; (PRUint32)i < argc; ++i) {
jsargv[i - 2] = argv[i];
}
} else {
NS_ASSERTION(argc <= 2, "Why do we have no jsargv when we have arguments?");
}
mArgv = array;
} else {
NS_WARNING("No func and no expr - why are we here?");
}
*aInterval = interval;
return NS_OK;
}
const PRUnichar *
nsJSScriptTimeoutHandler::GetHandlerText()
{
NS_ASSERTION(mExpr, "No expression, so no handler text!");
return ::JS_GetFlatStringChars(mExpr);
}
nsresult NS_CreateJSTimeoutHandler(nsGlobalWindow *aWindow,
bool *aIsInterval,
PRInt32 *aInterval,
nsIScriptTimeoutHandler **aRet)
{
*aRet = nullptr;
nsJSScriptTimeoutHandler *handler = new nsJSScriptTimeoutHandler();
if (!handler)
return NS_ERROR_OUT_OF_MEMORY;
nsresult rv = handler->Init(aWindow, aIsInterval, aInterval);
if (NS_FAILED(rv)) {
delete handler;
return rv;
}
NS_ADDREF(*aRet = handler);
return NS_OK;
}