#include "config.h"
#include "WasmInstance.h"
#if ENABLE(WEBASSEMBLY)
#include "JSCJSValueInlines.h"
#include "JSWebAssemblyInstance.h"
#include "Register.h"
#include "WasmModuleInformation.h"
#include <wtf/CheckedArithmetic.h>
namespace JSC { namespace Wasm {
namespace {
size_t globalMemoryByteSize(Module& module)
{
return (Checked<size_t>(module.moduleInformation().globals.size()) * sizeof(Register)).unsafeGet();
}
}
Instance::Instance(Context* context, Ref<Module>&& module, EntryFrame** pointerToTopEntryFrame, void** pointerToActualStackLimit, StoreTopCallFrameCallback&& storeTopCallFrame)
: m_context(context)
, m_module(WTFMove(module))
, m_globals(MallocPtr<Global::Value, VMMalloc>::malloc(globalMemoryByteSize(m_module.get())))
, m_globalsToMark(m_module.get().moduleInformation().globals.size())
, m_globalsToBinding(m_module.get().moduleInformation().globals.size())
, m_pointerToTopEntryFrame(pointerToTopEntryFrame)
, m_pointerToActualStackLimit(pointerToActualStackLimit)
, m_storeTopCallFrame(WTFMove(storeTopCallFrame))
, m_numImportFunctions(m_module->moduleInformation().importFunctionCount())
{
for (unsigned i = 0; i < m_numImportFunctions; ++i)
new (importFunctionInfo(i)) ImportFunctionInfo();
memset(static_cast<void*>(m_globals.get()), 0, globalMemoryByteSize(m_module.get()));
for (unsigned i = 0; i < m_module->moduleInformation().globals.size(); ++i) {
const Wasm::GlobalInformation& global = m_module.get().moduleInformation().globals[i];
if (global.bindingMode == Wasm::GlobalInformation::BindingMode::Portable) {
m_globalsToBinding.set(i);
} else if (isSubtype(global.type, Anyref)) {
m_globalsToMark.set(i);
}
}
memset(bitwise_cast<char*>(this) + offsetOfTablePtr(m_numImportFunctions, 0), 0, m_module->moduleInformation().tableCount() * sizeof(Table*));
}
Ref<Instance> Instance::create(Context* context, Ref<Module>&& module, EntryFrame** pointerToTopEntryFrame, void** pointerToActualStackLimit, StoreTopCallFrameCallback&& storeTopCallFrame)
{
return adoptRef(*new (NotNull, fastMalloc(allocationSize(module->moduleInformation().importFunctionCount(), module->moduleInformation().tableCount()))) Instance(context, WTFMove(module), pointerToTopEntryFrame, pointerToActualStackLimit, WTFMove(storeTopCallFrame)));
}
Instance::~Instance() { }
size_t Instance::extraMemoryAllocated() const
{
return globalMemoryByteSize(m_module.get()) + allocationSize(m_numImportFunctions, m_module->moduleInformation().tableCount());
}
void Instance::setGlobal(unsigned i, JSValue value)
{
Global::Value* slot = m_globals.get() + i;
if (m_globalsToBinding.get(i)) {
Wasm::Global* global = getGlobalBinding(i);
if (!global)
return;
global->valuePointer()->m_anyref.set(owner<JSWebAssemblyInstance>()->vm(), global->owner<JSWebAssemblyGlobal>(), value);
return;
}
ASSERT(m_owner);
slot->m_anyref.set(owner<JSWebAssemblyInstance>()->vm(), owner<JSWebAssemblyInstance>(), value);
}
JSValue Instance::getFunctionWrapper(unsigned i) const
{
JSValue value = m_functionWrappers.get(i).get();
if (value.isEmpty())
return jsNull();
return value;
}
void Instance::setFunctionWrapper(unsigned i, JSValue value)
{
ASSERT(m_owner);
ASSERT(value.isCallable(owner<JSWebAssemblyInstance>()->vm()));
ASSERT(!m_functionWrappers.contains(i));
auto locker = holdLock(owner<JSWebAssemblyInstance>()->cellLock());
m_functionWrappers.set(i, WriteBarrier<Unknown>(owner<JSWebAssemblyInstance>()->vm(), owner<JSWebAssemblyInstance>(), value));
ASSERT(getFunctionWrapper(i) == value);
}
Table* Instance::table(unsigned i)
{
RELEASE_ASSERT(i < m_module->moduleInformation().tableCount());
return *bitwise_cast<Table**>(bitwise_cast<char*>(this) + offsetOfTablePtr(m_numImportFunctions, i));
}
void Instance::setTable(unsigned i, Ref<Table>&& table)
{
RELEASE_ASSERT(i < m_module->moduleInformation().tableCount());
ASSERT(!this->table(i));
*bitwise_cast<Table**>(bitwise_cast<char*>(this) + offsetOfTablePtr(m_numImportFunctions, i)) = &table.leakRef();
}
void Instance::linkGlobal(unsigned i, Ref<Global>&& global)
{
m_globals.get()[i].m_pointer = global->valuePointer();
m_linkedGlobals.set(i, WTFMove(global));
}
} }
#endif // ENABLE(WEBASSEMBLY)