JSSegmentedVariableObject.cpp [plain text]
#include "config.h"
#include "JSSegmentedVariableObject.h"
#include "HeapAnalyzer.h"
#include "JSCInlines.h"
namespace JSC {
const ClassInfo JSSegmentedVariableObject::s_info = { "SegmentedVariableObject", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSSegmentedVariableObject) };
ScopeOffset JSSegmentedVariableObject::findVariableIndex(void* variableAddress)
{
auto locker = holdLock(cellLock());
for (unsigned i = m_variables.size(); i--;) {
if (&m_variables[i] != variableAddress)
continue;
return ScopeOffset(i);
}
CRASH();
return ScopeOffset();
}
ScopeOffset JSSegmentedVariableObject::addVariables(unsigned numberOfVariablesToAdd, JSValue initialValue)
{
auto locker = holdLock(cellLock());
size_t oldSize = m_variables.size();
m_variables.grow(oldSize + numberOfVariablesToAdd);
for (size_t i = numberOfVariablesToAdd; i--;)
m_variables[oldSize + i].setWithoutWriteBarrier(initialValue);
return ScopeOffset(oldSize);
}
void JSSegmentedVariableObject::visitChildren(JSCell* cell, SlotVisitor& slotVisitor)
{
JSSegmentedVariableObject* thisObject = jsCast<JSSegmentedVariableObject*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, slotVisitor);
auto locker = holdLock(thisObject->cellLock());
for (unsigned i = thisObject->m_variables.size(); i--;)
slotVisitor.appendHidden(thisObject->m_variables[i]);
}
void JSSegmentedVariableObject::analyzeHeap(JSCell* cell, HeapAnalyzer& analyzer)
{
JSSegmentedVariableObject* thisObject = jsCast<JSSegmentedVariableObject*>(cell);
Base::analyzeHeap(cell, analyzer);
ConcurrentJSLocker locker(thisObject->symbolTable()->m_lock);
SymbolTable::Map::iterator end = thisObject->symbolTable()->end(locker);
for (SymbolTable::Map::iterator it = thisObject->symbolTable()->begin(locker); it != end; ++it) {
SymbolTableEntry::Fast entry = it->value;
ASSERT(!entry.isNull());
ScopeOffset offset = entry.scopeOffset();
if (!thisObject->isValidScopeOffset(offset))
continue;
JSValue toValue = thisObject->variableAt(offset).get();
if (toValue && toValue.isCell())
analyzer.analyzeVariableNameEdge(thisObject, toValue.asCell(), it->key.get());
}
}
JSSegmentedVariableObject::JSSegmentedVariableObject(VM& vm, Structure* structure, JSScope* scope)
: JSSymbolTableObject(vm, structure, scope)
{
}
JSSegmentedVariableObject::~JSSegmentedVariableObject()
{
#ifndef NDEBUG
ASSERT(!m_alreadyDestroyed);
m_alreadyDestroyed = true;
#endif
}
void JSSegmentedVariableObject::finishCreation(VM& vm)
{
Base::finishCreation(vm);
setSymbolTable(vm, SymbolTable::create(vm));
}
}