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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 "vm/Xdr.h"
#include "mozilla/PodOperations.h"
#include <string.h>
#include "jsapi.h"
#include "jsscript.h"
#include "vm/Debugger.h"
#include "vm/EnvironmentObject.h"
using namespace js;
using mozilla::PodEqual;
template<XDRMode mode>
void
XDRState<mode>::postProcessContextErrors(JSContext* cx)
{
if (cx->isExceptionPending()) {
MOZ_ASSERT(resultCode_ == JS::TranscodeResult_Ok);
resultCode_ = JS::TranscodeResult_Throw;
}
}
template<XDRMode mode>
bool
XDRState<mode>::codeChars(const Latin1Char* chars, size_t nchars)
{
static_assert(sizeof(Latin1Char) == sizeof(uint8_t), "Latin1Char must fit in 1 byte");
MOZ_ASSERT(mode == XDR_ENCODE);
if (nchars == 0)
return true;
uint8_t* ptr = buf.write(nchars);
if (!ptr)
return false;
mozilla::PodCopy(ptr, chars, nchars);
return true;
}
template<XDRMode mode>
bool
XDRState<mode>::codeChars(char16_t* chars, size_t nchars)
{
if (nchars == 0)
return true;
size_t nbytes = nchars * sizeof(char16_t);
if (mode == XDR_ENCODE) {
uint8_t* ptr = buf.write(nbytes);
if (!ptr)
return false;
mozilla::NativeEndian::copyAndSwapToLittleEndian(ptr, chars, nchars);
} else {
const uint8_t* ptr = buf.read(nbytes);
mozilla::NativeEndian::copyAndSwapFromLittleEndian(chars, ptr, nchars);
}
return true;
}
template<XDRMode mode>
static bool
VersionCheck(XDRState<mode>* xdr)
{
JS::BuildIdCharVector buildId;
if (!xdr->cx()->buildIdOp() || !xdr->cx()->buildIdOp()(&buildId)) {
JS_ReportErrorNumberASCII(xdr->cx(), GetErrorMessage, nullptr,
JSMSG_BUILD_ID_NOT_AVAILABLE);
return false;
}
MOZ_ASSERT(!buildId.empty());
uint32_t buildIdLength;
if (mode == XDR_ENCODE)
buildIdLength = buildId.length();
if (!xdr->codeUint32(&buildIdLength))
return false;
if (mode == XDR_DECODE && buildIdLength != buildId.length())
return xdr->fail(JS::TranscodeResult_Failure_BadBuildId);
if (mode == XDR_ENCODE) {
if (!xdr->codeBytes(buildId.begin(), buildIdLength))
return false;
} else {
JS::BuildIdCharVector decodedBuildId;
// buildIdLength is already checked against the length of current
// buildId.
if (!decodedBuildId.resize(buildIdLength)) {
ReportOutOfMemory(xdr->cx());
return false;
}
if (!xdr->codeBytes(decodedBuildId.begin(), buildIdLength))
return false;
// We do not provide binary compatibility with older scripts.
if (!PodEqual(decodedBuildId.begin(), buildId.begin(), buildIdLength))
return xdr->fail(JS::TranscodeResult_Failure_BadBuildId);
}
return true;
}
template<XDRMode mode>
bool
XDRState<mode>::codeFunction(MutableHandleFunction funp)
{
if (mode == XDR_DECODE)
funp.set(nullptr);
else
MOZ_ASSERT(funp->nonLazyScript()->enclosingScope()->is<GlobalScope>());
if (!VersionCheck(this)) {
postProcessContextErrors(cx());
return false;
}
RootedScope scope(cx(), &cx()->global()->emptyGlobalScope());
if (!XDRInterpretedFunction(this, scope, nullptr, funp)) {
postProcessContextErrors(cx());
funp.set(nullptr);
return false;
}
return true;
}
template<XDRMode mode>
bool
XDRState<mode>::codeScript(MutableHandleScript scriptp)
{
if (mode == XDR_DECODE)
scriptp.set(nullptr);
else
MOZ_ASSERT(!scriptp->enclosingScope());
if (!VersionCheck(this)) {
postProcessContextErrors(cx());
return false;
}
if (!XDRScript(this, nullptr, nullptr, nullptr, scriptp)) {
postProcessContextErrors(cx());
scriptp.set(nullptr);
return false;
}
return true;
}
template<XDRMode mode>
bool
XDRState<mode>::codeConstValue(MutableHandleValue vp)
{
return XDRScriptConst(this, vp);
}
template class js::XDRState<XDR_ENCODE>;
template class js::XDRState<XDR_DECODE>;
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