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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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
#include "mozilla/scache/StartupCache.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "js/CompileOptions.h"
#include "js/Transcoding.h"
#include "js/experimental/JSStencil.h"
#include "mozilla/BasePrincipal.h"
#include "mozilla/Span.h"
using namespace JS;
using namespace mozilla::scache;
using mozilla::UniquePtr;
static nsresult HandleTranscodeResult(JSContext* cx,
JS::TranscodeResult result) {
if (result == JS::TranscodeResult::Ok) {
return NS_OK;
}
if (result == JS::TranscodeResult::Throw) {
JS_ClearPendingException(cx);
return NS_ERROR_OUT_OF_MEMORY;
}
MOZ_ASSERT(IsTranscodeFailureResult(result));
return NS_ERROR_FAILURE;
}
nsresult ReadCachedStencil(StartupCache* cache, nsACString& cachePath,
JSContext* cx,
const JS::ReadOnlyDecodeOptions& options,
JS::Stencil** stencilOut) {
MOZ_ASSERT(options.borrowBuffer);
MOZ_ASSERT(!options.usePinnedBytecode);
const char* buf;
uint32_t len;
nsresult rv =
cache->GetBuffer(PromiseFlatCString(cachePath).get(), &buf, &len);
if (NS_FAILED(rv)) {
return rv; // don't warn since NOT_AVAILABLE is an ok error
}
JS::TranscodeRange range(AsBytes(mozilla::Span(buf, len)));
JS::TranscodeResult code = JS::DecodeStencil(cx, options, range, stencilOut);
return HandleTranscodeResult(cx, code);
}
nsresult WriteCachedStencil(StartupCache* cache, nsACString& cachePath,
JSContext* cx, JS::Stencil* stencil) {
JS::TranscodeBuffer buffer;
JS::TranscodeResult code = JS::EncodeStencil(cx, stencil, buffer);
if (code != JS::TranscodeResult::Ok) {
return HandleTranscodeResult(cx, code);
}
size_t size = buffer.length();
if (size > UINT32_MAX) {
return NS_ERROR_FAILURE;
}
// Move the vector buffer into a unique pointer buffer.
mozilla::UniqueFreePtr<char[]> buf(
reinterpret_cast<char*>(buffer.extractOrCopyRawBuffer()));
nsresult rv = cache->PutBuffer(PromiseFlatCString(cachePath).get(),
std::move(buf), size);
return rv;
}