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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */
/* Code for throwing errors into JavaScript. */
#include "xpcprivate.h"
#include "XPCWrapper.h"
#include "jsprf.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/Exceptions.h"
#include "nsStringGlue.h"
using namespace mozilla;
using namespace mozilla::dom;
bool XPCThrower::sVerbose = true;
// static
void
XPCThrower::Throw(nsresult rv, JSContext* cx)
{
const char* format;
if (JS_IsExceptionPending(cx))
return;
if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format))
format = "";
dom::Throw(cx, rv, nsDependentCString(format));
}
namespace xpc {
bool
Throw(JSContext* cx, nsresult rv)
{
XPCThrower::Throw(rv, cx);
return false;
}
} // namespace xpc
/*
* If there has already been an exception thrown, see if we're throwing the
* same sort of exception, and if we are, don't clobber the old one. ccx
* should be the current call context.
*/
// static
bool
XPCThrower::CheckForPendingException(nsresult result, JSContext* cx)
{
nsCOMPtr<nsIException> e = XPCJSContext::Get()->GetPendingException();
if (!e)
return false;
XPCJSContext::Get()->SetPendingException(nullptr);
nsresult e_result;
if (NS_FAILED(e->GetResult(&e_result)) || e_result != result)
return false;
ThrowExceptionObject(cx, e);
return true;
}
// static
void
XPCThrower::Throw(nsresult rv, XPCCallContext& ccx)
{
char* sz;
const char* format;
if (CheckForPendingException(rv, ccx))
return;
if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format))
format = "";
sz = (char*) format;
NS_ENSURE_TRUE_VOID(sz);
if (sz && sVerbose)
Verbosify(ccx, &sz, false);
dom::Throw(ccx, rv, nsDependentCString(sz));
if (sz && sz != format)
JS_smprintf_free(sz);
}
// static
void
XPCThrower::ThrowBadResult(nsresult rv, nsresult result, XPCCallContext& ccx)
{
char* sz;
const char* format;
const char* name;
/*
* If there is a pending exception when the native call returns and
* it has the same error result as returned by the native call, then
* the native call may be passing through an error from a previous JS
* call. So we'll just throw that exception into our JS. Note that
* we don't need to worry about NS_ERROR_UNCATCHABLE_EXCEPTION,
* because presumably there would be no pending exception for that
* nsresult!
*/
if (CheckForPendingException(result, ccx))
return;
// else...
if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format) || !format)
format = "";
if (nsXPCException::NameAndFormatForNSResult(result, &name, nullptr) && name)
sz = JS_smprintf("%s 0x%x (%s)", format, (unsigned) result, name);
else
sz = JS_smprintf("%s 0x%x", format, (unsigned) result);
NS_ENSURE_TRUE_VOID(sz);
if (sz && sVerbose)
Verbosify(ccx, &sz, true);
dom::Throw(ccx, result, nsDependentCString(sz));
if (sz)
JS_smprintf_free(sz);
}
// static
void
XPCThrower::ThrowBadParam(nsresult rv, unsigned paramNum, XPCCallContext& ccx)
{
char* sz;
const char* format;
if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format))
format = "";
sz = JS_smprintf("%s arg %d", format, paramNum);
NS_ENSURE_TRUE_VOID(sz);
if (sz && sVerbose)
Verbosify(ccx, &sz, true);
dom::Throw(ccx, rv, nsDependentCString(sz));
if (sz)
JS_smprintf_free(sz);
}
// static
void
XPCThrower::Verbosify(XPCCallContext& ccx,
char** psz, bool own)
{
char* sz = nullptr;
if (ccx.HasInterfaceAndMember()) {
XPCNativeInterface* iface = ccx.GetInterface();
jsid id = ccx.GetMember()->GetName();
JSAutoByteString bytes;
const char* name = JSID_IS_VOID(id) ? "Unknown" : bytes.encodeLatin1(ccx, JSID_TO_STRING(id));
if (!name) {
name = "";
}
sz = JS_smprintf("%s [%s.%s]", *psz, iface->GetNameString(), name);
}
if (sz) {
if (own)
JS_smprintf_free(*psz);
*psz = sz;
}
}
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