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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /js/xpconnect/src/XPCThrower.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'js/xpconnect/src/XPCThrower.cpp')
-rw-r--r--js/xpconnect/src/XPCThrower.cpp179
1 files changed, 179 insertions, 0 deletions
diff --git a/js/xpconnect/src/XPCThrower.cpp b/js/xpconnect/src/XPCThrower.cpp
new file mode 100644
index 000000000..4a37e1554
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+++ b/js/xpconnect/src/XPCThrower.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim: set ts=8 sts=4 et sw=4 tw=99: */
+/* 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;
+ }
+}