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/*
* Copyright (C) 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "JSModuleEnvironment.h"
#include "Interpreter.h"
#include "JSCInlines.h"
#include "JSFunction.h"
using namespace std;
namespace JSC {
const ClassInfo JSModuleEnvironment::s_info = { "JSModuleEnvironment", &Base::s_info, 0, CREATE_METHOD_TABLE(JSModuleEnvironment) };
JSModuleEnvironment* JSModuleEnvironment::create(
VM& vm, Structure* structure, JSScope* currentScope, SymbolTable* symbolTable, JSValue initialValue, JSModuleRecord* moduleRecord)
{
// JSLexicalEnvironment (precisely, JSEnvironmentRecord) has the storage to store the variable slots after the its class storage.
// Because the offset of the variable slots are fixed in the JSEnvironmentRecord, inheritting these class and adding new member field is not allowed,
// the new member will overlap the variable slots.
// To keep the JSModuleEnvironment compatible to the JSLexicalEnvironment but add the new member to store the JSModuleRecord, we additionally allocate
// the storage after the variable slots.
//
// JSLexicalEnvironment:
// [ JSLexicalEnvironment ][ variable slots ]
//
// JSModuleEnvironment:
// [ JSLexicalEnvironment ][ variable slots ][ additional slots for JSModuleEnvironment ]
JSModuleEnvironment* result =
new (
NotNull,
allocateCell<JSModuleEnvironment>(vm.heap, JSModuleEnvironment::allocationSize(symbolTable)))
JSModuleEnvironment(vm, structure, currentScope, symbolTable);
result->finishCreation(vm, initialValue, moduleRecord);
return result;
}
void JSModuleEnvironment::finishCreation(VM& vm, JSValue initialValue, JSModuleRecord* moduleRecord)
{
Base::finishCreation(vm, initialValue);
this->moduleRecordSlot().set(vm, this, moduleRecord);
}
void JSModuleEnvironment::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
JSModuleEnvironment* thisObject = jsCast<JSModuleEnvironment*>(cell);
Base::visitChildren(thisObject, visitor);
visitor.appendValues(thisObject->variables(), thisObject->symbolTable()->scopeSize());
visitor.append(&thisObject->moduleRecordSlot());
}
bool JSModuleEnvironment::getOwnPropertySlot(JSObject* cell, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
JSModuleEnvironment* thisObject = jsCast<JSModuleEnvironment*>(cell);
JSModuleRecord::Resolution resolution = thisObject->moduleRecord()->resolveImport(exec, Identifier::fromUid(exec, propertyName.uid()));
if (resolution.type == JSModuleRecord::Resolution::Type::Resolved) {
// When resolveImport resolves the resolution, the imported module environment must have the binding.
JSModuleEnvironment* importedModuleEnvironment = resolution.moduleRecord->moduleEnvironment();
PropertySlot redirectSlot(importedModuleEnvironment, PropertySlot::InternalMethodType::Get);
bool result = importedModuleEnvironment->methodTable(exec->vm())->getOwnPropertySlot(importedModuleEnvironment, exec, resolution.localName, redirectSlot);
ASSERT_UNUSED(result, result);
ASSERT(redirectSlot.isValue());
JSValue value = redirectSlot.getValue(exec, resolution.localName);
ASSERT(!exec->hadException());
slot.setValue(thisObject, redirectSlot.attributes(), value);
return true;
}
return Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
}
void JSModuleEnvironment::getOwnNonIndexPropertyNames(JSObject* cell, ExecState* exec, PropertyNameArray& propertyNamesArray, EnumerationMode mode)
{
JSModuleEnvironment* thisObject = jsCast<JSModuleEnvironment*>(cell);
if (propertyNamesArray.includeStringProperties()) {
for (const auto& pair : thisObject->moduleRecord()->importEntries()) {
const JSModuleRecord::ImportEntry& importEntry = pair.value;
if (!importEntry.isNamespace(exec->vm()))
propertyNamesArray.add(importEntry.localName);
}
}
return Base::getOwnNonIndexPropertyNames(thisObject, exec, propertyNamesArray, mode);
}
void JSModuleEnvironment::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
{
JSModuleEnvironment* thisObject = jsCast<JSModuleEnvironment*>(cell);
// All imported bindings are immutable.
JSModuleRecord::Resolution resolution = thisObject->moduleRecord()->resolveImport(exec, Identifier::fromUid(exec, propertyName.uid()));
if (resolution.type == JSModuleRecord::Resolution::Type::Resolved) {
throwTypeError(exec, ASCIILiteral(StrictModeReadonlyPropertyWriteError));
return;
}
return Base::put(thisObject, exec, propertyName, value, slot);
}
bool JSModuleEnvironment::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
{
JSModuleEnvironment* thisObject = jsCast<JSModuleEnvironment*>(cell);
// All imported bindings are immutable.
JSModuleRecord::Resolution resolution = thisObject->moduleRecord()->resolveImport(exec, Identifier::fromUid(exec, propertyName.uid()));
if (resolution.type == JSModuleRecord::Resolution::Type::Resolved)
return false;
return Base::deleteProperty(thisObject, exec, propertyName);
}
} // namespace JSC
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