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ReloadableString.cpp
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146 lines (129 loc) · 4.81 KB
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/*
* Copyright (c) 2020-present Samsung Electronics Co., Ltd
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*/
#if defined(ENABLE_RELOADABLE_STRING)
#include "Escargot.h"
#include "ReloadableString.h"
#include "runtime/Context.h"
#include "runtime/VMInstance.h"
namespace Escargot {
void* ReloadableString::operator new(size_t size)
{
static MAY_THREAD_LOCAL bool typeInited = false;
static MAY_THREAD_LOCAL GC_descr descr;
if (!typeInited) {
GC_word obj_bitmap[GC_BITMAP_SIZE(ReloadableString)] = { 0 };
GC_set_bit(obj_bitmap, GC_WORD_OFFSET(ReloadableString, m_vmInstance));
GC_set_bit(obj_bitmap, GC_WORD_OFFSET(ReloadableString, m_callbackData));
GC_set_bit(obj_bitmap, GC_WORD_OFFSET(ReloadableString, m_bufferData.buffer));
descr = GC_make_descriptor(obj_bitmap, GC_WORD_LEN(ReloadableString));
typeInited = true;
}
return GC_MALLOC_EXPLICITLY_TYPED(size, descr);
}
ReloadableString::ReloadableString(VMInstance* instance, bool is8Bit, size_t stringLength, void* callbackData, void* (*loadCallback)(void* callbackData), void (*unloadCallback)(void* memoryPtr, void* callbackData))
: String()
, m_isOwnerMayFreed(false)
, m_isUnloaded(true)
, m_vmInstance(instance)
, m_callbackData(callbackData)
, m_stringLoadCallback(loadCallback)
, m_stringUnloadCallback(unloadCallback)
{
m_bufferData.hasSpecialImpl = true;
m_bufferData.has8BitContent = is8Bit;
m_bufferData.length = stringLength;
m_bufferData.buffer = nullptr;
auto& v = instance->reloadableStrings();
v.push_back(this);
GC_REGISTER_FINALIZER_NO_ORDER(this, [](void* obj, void*) {
ReloadableString* self = (ReloadableString*)obj;
if (!self->m_isUnloaded) {
self->m_stringUnloadCallback(const_cast<void*>(self->m_bufferData.buffer), self->m_callbackData);
}
if (!self->m_isOwnerMayFreed) {
auto& v = self->m_vmInstance->reloadableStrings();
v.erase(std::find(v.begin(), v.end(), self));
}
},
nullptr, nullptr, nullptr);
}
UTF8StringDataNonGCStd ReloadableString::toNonGCUTF8StringData(int options) const
{
return bufferAccessData().toUTF8String<UTF8StringDataNonGCStd>();
}
UTF8StringData ReloadableString::toUTF8StringData() const
{
return bufferAccessData().toUTF8String<UTF8StringData>();
}
UTF16StringData ReloadableString::toUTF16StringData() const
{
auto data = bufferAccessData();
if (data.has8BitContent) {
UTF16StringData ret;
ret.resizeWithUninitializedValues(data.length);
for (size_t i = 0; i < data.length; i++) {
ret[i] = data.uncheckedCharAtFor8Bit(i);
}
return ret;
} else {
return UTF16StringData(data.bufferAs16Bit, data.length);
}
}
bool ReloadableString::unload()
{
ASSERT(!m_isUnloaded);
if (UNLIKELY(!m_bufferData.length)) {
return false;
}
return unloadWorker(currentStackPointer());
}
bool ReloadableString::unloadWorker(void* callerSP)
{
#if defined(STACK_GROWS_DOWN)
size_t* start = (size_t*)((size_t)callerSP & ~(sizeof(size_t) - 1));
size_t* end = (size_t*)m_vmInstance->stackStartAddress();
#else
size_t* start = (size_t*)m_vmInstance->stackStartAddress();
size_t* end = (size_t*)((size_t)callerSP & ~(sizeof(size_t) - 1));
#endif
while (start != end) {
if (UNLIKELY(*start == (size_t)m_bufferData.buffer)) {
// if there is reference on stack, we cannot unload string.
return false;
}
start++;
}
m_stringUnloadCallback(const_cast<void*>(m_bufferData.buffer), m_callbackData);
m_bufferData.buffer = nullptr;
m_isUnloaded = true;
return true;
}
void ReloadableString::load()
{
ASSERT(m_isUnloaded);
ASSERT(m_bufferData.length);
m_isUnloaded = false;
m_bufferData.buffer = m_stringLoadCallback(m_callbackData);
if (UNLIKELY(m_bufferData.buffer == nullptr)) {
ESCARGOT_LOG_ERROR("failed to load string(ReloadableString::load) %p\n", this);
RELEASE_ASSERT_NOT_REACHED();
}
}
} // namespace Escargot
#endif // ENABLE_RELOADABLE_STRING