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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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85
js/xpconnect/loader/mozJSLoaderUtils.cpp Normal file
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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/. */
#include "mozilla/scache/StartupCache.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "nsJSPrincipals.h"
using namespace JS;
using namespace mozilla::scache;
using mozilla::UniquePtr;
// We only serialize scripts with system principals. So we don't serialize the
// principals when writing a script. Instead, when reading it back, we set the
// principals to the system principals.
nsresult
ReadCachedScript(StartupCache* cache, nsACString& uri, JSContext* cx,
nsIPrincipal* systemPrincipal, MutableHandleScript scriptp)
{
UniquePtr<char[]> buf;
uint32_t len;
nsresult rv = cache->GetBuffer(PromiseFlatCString(uri).get(), &buf, &len);
if (NS_FAILED(rv))
return rv; // don't warn since NOT_AVAILABLE is an ok error
JS::TranscodeBuffer buffer;
buffer.replaceRawBuffer(reinterpret_cast<uint8_t*>(buf.release()), len);
JS::TranscodeResult code = JS::DecodeScript(cx, buffer, scriptp);
if (code == JS::TranscodeResult_Ok)
return NS_OK;
if ((code & JS::TranscodeResult_Failure) != 0)
return NS_ERROR_FAILURE;
MOZ_ASSERT((code & JS::TranscodeResult_Throw) != 0);
JS_ClearPendingException(cx);
return NS_ERROR_OUT_OF_MEMORY;
}
nsresult
ReadCachedFunction(StartupCache* cache, nsACString& uri, JSContext* cx,
nsIPrincipal* systemPrincipal, JSFunction** functionp)
{
// This doesn't actually work ...
return NS_ERROR_NOT_IMPLEMENTED;
}
nsresult
WriteCachedScript(StartupCache* cache, nsACString& uri, JSContext* cx,
nsIPrincipal* systemPrincipal, HandleScript script)
{
MOZ_ASSERT(JS_GetScriptPrincipals(script) == nsJSPrincipals::get(systemPrincipal));
JS::TranscodeBuffer buffer;
JS::TranscodeResult code = JS::EncodeScript(cx, buffer, script);
if (code != JS::TranscodeResult_Ok) {
if ((code & JS::TranscodeResult_Failure) != 0)
return NS_ERROR_FAILURE;
MOZ_ASSERT((code & JS::TranscodeResult_Throw) != 0);
JS_ClearPendingException(cx);
return NS_ERROR_OUT_OF_MEMORY;
}
size_t size = buffer.length();
if (size > UINT32_MAX)
return NS_ERROR_FAILURE;
nsresult rv = cache->PutBuffer(PromiseFlatCString(uri).get(),
reinterpret_cast<char*>(buffer.begin()),
size);
return rv;
}
nsresult
WriteCachedFunction(StartupCache* cache, nsACString& uri, JSContext* cx,
nsIPrincipal* systemPrincipal, JSFunction* function)
{
// This doesn't actually work ...
return NS_ERROR_NOT_IMPLEMENTED;
}