1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/xpconnect/src/XPCThrower.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,173 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
1.5 +/* vim: set ts=8 sts=4 et sw=4 tw=99: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +/* Code for throwing errors into JavaScript. */
1.11 +
1.12 +#include "xpcprivate.h"
1.13 +#include "XPCWrapper.h"
1.14 +#include "jsprf.h"
1.15 +#include "mozilla/dom/BindingUtils.h"
1.16 +#include "mozilla/dom/Exceptions.h"
1.17 +
1.18 +using namespace mozilla;
1.19 +using namespace mozilla::dom;
1.20 +
1.21 +bool XPCThrower::sVerbose = true;
1.22 +
1.23 +// static
1.24 +void
1.25 +XPCThrower::Throw(nsresult rv, JSContext* cx)
1.26 +{
1.27 + const char* format;
1.28 + if (JS_IsExceptionPending(cx))
1.29 + return;
1.30 + if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format))
1.31 + format = "";
1.32 + dom::Throw(cx, rv, format);
1.33 +}
1.34 +
1.35 +namespace xpc {
1.36 +
1.37 +bool
1.38 +Throw(JSContext *cx, nsresult rv)
1.39 +{
1.40 + XPCThrower::Throw(rv, cx);
1.41 + return false;
1.42 +}
1.43 +
1.44 +} // namespace xpc
1.45 +
1.46 +/*
1.47 + * If there has already been an exception thrown, see if we're throwing the
1.48 + * same sort of exception, and if we are, don't clobber the old one. ccx
1.49 + * should be the current call context.
1.50 + */
1.51 +// static
1.52 +bool
1.53 +XPCThrower::CheckForPendingException(nsresult result, JSContext *cx)
1.54 +{
1.55 + nsCOMPtr<nsIException> e = XPCJSRuntime::Get()->GetPendingException();
1.56 + if (!e)
1.57 + return false;
1.58 + XPCJSRuntime::Get()->SetPendingException(nullptr);
1.59 +
1.60 + nsresult e_result;
1.61 + if (NS_FAILED(e->GetResult(&e_result)) || e_result != result)
1.62 + return false;
1.63 +
1.64 + if (!ThrowExceptionObject(cx, e))
1.65 + JS_ReportOutOfMemory(cx);
1.66 + return true;
1.67 +}
1.68 +
1.69 +// static
1.70 +void
1.71 +XPCThrower::Throw(nsresult rv, XPCCallContext& ccx)
1.72 +{
1.73 + char* sz;
1.74 + const char* format;
1.75 +
1.76 + if (CheckForPendingException(rv, ccx))
1.77 + return;
1.78 +
1.79 + if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format))
1.80 + format = "";
1.81 +
1.82 + sz = (char*) format;
1.83 +
1.84 + if (sz && sVerbose)
1.85 + Verbosify(ccx, &sz, false);
1.86 +
1.87 + dom::Throw(ccx, rv, sz);
1.88 +
1.89 + if (sz && sz != format)
1.90 + JS_smprintf_free(sz);
1.91 +}
1.92 +
1.93 +
1.94 +// static
1.95 +void
1.96 +XPCThrower::ThrowBadResult(nsresult rv, nsresult result, XPCCallContext& ccx)
1.97 +{
1.98 + char* sz;
1.99 + const char* format;
1.100 + const char* name;
1.101 +
1.102 + /*
1.103 + * If there is a pending exception when the native call returns and
1.104 + * it has the same error result as returned by the native call, then
1.105 + * the native call may be passing through an error from a previous JS
1.106 + * call. So we'll just throw that exception into our JS.
1.107 + */
1.108 +
1.109 + if (CheckForPendingException(result, ccx))
1.110 + return;
1.111 +
1.112 + // else...
1.113 +
1.114 + if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format) || !format)
1.115 + format = "";
1.116 +
1.117 + if (nsXPCException::NameAndFormatForNSResult(result, &name, nullptr) && name)
1.118 + sz = JS_smprintf("%s 0x%x (%s)", format, result, name);
1.119 + else
1.120 + sz = JS_smprintf("%s 0x%x", format, result);
1.121 +
1.122 + if (sz && sVerbose)
1.123 + Verbosify(ccx, &sz, true);
1.124 +
1.125 + dom::Throw(ccx, result, sz);
1.126 +
1.127 + if (sz)
1.128 + JS_smprintf_free(sz);
1.129 +}
1.130 +
1.131 +// static
1.132 +void
1.133 +XPCThrower::ThrowBadParam(nsresult rv, unsigned paramNum, XPCCallContext& ccx)
1.134 +{
1.135 + char* sz;
1.136 + const char* format;
1.137 +
1.138 + if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format))
1.139 + format = "";
1.140 +
1.141 + sz = JS_smprintf("%s arg %d", format, paramNum);
1.142 +
1.143 + if (sz && sVerbose)
1.144 + Verbosify(ccx, &sz, true);
1.145 +
1.146 + dom::Throw(ccx, rv, sz);
1.147 +
1.148 + if (sz)
1.149 + JS_smprintf_free(sz);
1.150 +}
1.151 +
1.152 +
1.153 +// static
1.154 +void
1.155 +XPCThrower::Verbosify(XPCCallContext& ccx,
1.156 + char** psz, bool own)
1.157 +{
1.158 + char* sz = nullptr;
1.159 +
1.160 + if (ccx.HasInterfaceAndMember()) {
1.161 + XPCNativeInterface* iface = ccx.GetInterface();
1.162 + jsid id = ccx.GetMember()->GetName();
1.163 + JSAutoByteString bytes;
1.164 + const char *name = JSID_IS_VOID(id) ? "Unknown" : bytes.encodeLatin1(ccx, JSID_TO_STRING(id));
1.165 + if (!name) {
1.166 + name = "";
1.167 + }
1.168 + sz = JS_smprintf("%s [%s.%s]", *psz, iface->GetNameString(), name);
1.169 + }
1.170 +
1.171 + if (sz) {
1.172 + if (own)
1.173 + JS_smprintf_free(*psz);
1.174 + *psz = sz;
1.175 + }
1.176 +}
