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Copy pathDebuggerScope.cpp
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237 lines (204 loc) · 8.65 KB
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/*
* Copyright (C) 2008-2023 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
* 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 "DebuggerScope.h"
#include "JSCInlines.h"
#include "JSLexicalEnvironment.h"
#include "StructureCreateInlines.h"
namespace JSC {
STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(DebuggerScope);
const ClassInfo DebuggerScope::s_info = { "DebuggerScope"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(DebuggerScope) };
DebuggerScope* DebuggerScope::create(VM& vm, JSScope* scope)
{
Structure* structure = scope->realm()->debuggerScopeStructure();
DebuggerScope* debuggerScope = new (NotNull, allocateCell<DebuggerScope>(vm)) DebuggerScope(vm, structure, scope);
debuggerScope->finishCreation(vm);
return debuggerScope;
}
DebuggerScope::DebuggerScope(VM& vm, Structure* structure, JSScope* scope)
: JSNonFinalObject(vm, structure)
, m_scope(scope, WriteBarrierEarlyInit)
{
ASSERT(scope);
}
template<typename Visitor>
void DebuggerScope::visitChildrenImpl(JSCell* cell, Visitor& visitor)
{
DebuggerScope* thisObject = uncheckedDowncast<DebuggerScope>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(cell, visitor);
visitor.append(thisObject->m_scope);
visitor.append(thisObject->m_next);
}
DEFINE_VISIT_CHILDREN(DebuggerScope);
bool DebuggerScope::getOwnPropertySlot(JSObject* object, JSGlobalObject* globalObject, PropertyName propertyName, PropertySlot& slot)
{
DebuggerScope* scope = uncheckedDowncast<DebuggerScope>(object);
if (!scope->isValid())
return false;
JSObject* thisObject = JSScope::objectAtScope(scope->jsScope());
slot.setThisValue(JSValue(thisObject));
// By default, JSObject::getPropertySlot() will look in the DebuggerScope's prototype
// chain and not the wrapped scope, and JSObject::getPropertySlot() cannot be overridden
// to behave differently for the DebuggerScope.
//
// Instead, we'll treat all properties in the wrapped scope and its prototype chain as
// the own properties of the DebuggerScope. This is fine because the WebInspector
// does not presently need to distinguish between what's owned at each level in the
// prototype chain. Hence, we'll invoke getPropertySlot() on the wrapped scope here
// instead of getOwnPropertySlot().
bool result = thisObject->getPropertySlot(globalObject, propertyName, slot);
if (result && slot.isValue() && slot.getValue(globalObject, propertyName) == jsTDZValue()) {
// FIXME:
// We hit a scope property that has the TDZ empty value.
// Currently, we just lie to the inspector and claim that this property is undefined.
// This is not ideal and we should fix it.
// https://bugs.webkit.org/show_bug.cgi?id=144977
slot.setValue(slot.slotBase(), static_cast<unsigned>(PropertyAttribute::DontEnum), jsUndefined());
return true;
}
return result;
}
bool DebuggerScope::put(JSCell* cell, JSGlobalObject* globalObject, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
{
DebuggerScope* scope = uncheckedDowncast<DebuggerScope>(cell);
ASSERT(scope->isValid());
if (!scope->isValid())
return false;
JSObject* thisObject = JSScope::objectAtScope(scope->jsScope());
slot.setThisValue(JSValue(thisObject));
return thisObject->methodTable()->put(thisObject, globalObject, propertyName, value, slot);
}
bool DebuggerScope::deleteProperty(JSCell* cell, JSGlobalObject* globalObject, PropertyName propertyName, DeletePropertySlot& slot)
{
DebuggerScope* scope = uncheckedDowncast<DebuggerScope>(cell);
ASSERT(scope->isValid());
if (!scope->isValid())
return false;
JSObject* thisObject = JSScope::objectAtScope(scope->jsScope());
return thisObject->methodTable()->deleteProperty(thisObject, globalObject, propertyName, slot);
}
void DebuggerScope::getOwnPropertyNames(JSObject* object, JSGlobalObject* globalObject, PropertyNameArrayBuilder& propertyNames, DontEnumPropertiesMode mode)
{
DebuggerScope* scope = uncheckedDowncast<DebuggerScope>(object);
ASSERT(scope->isValid());
if (!scope->isValid())
return;
JSObject* thisObject = JSScope::objectAtScope(scope->jsScope());
thisObject->getPropertyNames(globalObject, propertyNames, mode);
}
bool DebuggerScope::defineOwnProperty(JSObject* object, JSGlobalObject* globalObject, PropertyName propertyName, const PropertyDescriptor& descriptor, bool shouldThrow)
{
DebuggerScope* scope = uncheckedDowncast<DebuggerScope>(object);
ASSERT(scope->isValid());
if (!scope->isValid())
return false;
JSObject* thisObject = JSScope::objectAtScope(scope->jsScope());
return thisObject->methodTable()->defineOwnProperty(thisObject, globalObject, propertyName, descriptor, shouldThrow);
}
DebuggerScope* DebuggerScope::next()
{
ASSERT(isValid());
if (!m_next && m_scope->next()) {
VM& vm = m_scope->vm();
DebuggerScope* nextScope = create(vm, m_scope->next());
m_next.set(vm, this, nextScope);
}
return m_next.get();
}
void DebuggerScope::invalidateChain()
{
if (!isValid())
return;
DebuggerScope* scope = this;
while (scope) {
DebuggerScope* nextScope = scope->m_next.get();
scope->m_next.clear();
scope->m_scope.clear(); // This also marks this scope as invalid.
scope = nextScope;
}
}
bool DebuggerScope::isCatchScope() const
{
return m_scope->isCatchScope();
}
bool DebuggerScope::isFunctionNameScope() const
{
return m_scope->isFunctionNameScopeObject();
}
bool DebuggerScope::isWithScope() const
{
return m_scope->isWithScope();
}
bool DebuggerScope::isGlobalScope() const
{
return m_scope->isGlobalObject();
}
bool DebuggerScope::isGlobalLexicalEnvironment() const
{
return m_scope->isGlobalLexicalEnvironment();
}
bool DebuggerScope::isClosureScope() const
{
// In the current debugger implementation, every function or eval will create an
// lexical environment object. Hence, a lexical environment object implies a
// function or eval scope.
return m_scope->isVarScope() || m_scope->isLexicalScope();
}
bool DebuggerScope::isNestedLexicalScope() const
{
return m_scope->isNestedLexicalScope();
}
String DebuggerScope::name() const
{
SymbolTable* symbolTable = m_scope->symbolTable();
if (!symbolTable)
return String();
return symbolTable->inferredName();
}
DebuggerLocation DebuggerScope::location() const
{
SymbolTable* symbolTable = m_scope->symbolTable();
if (!symbolTable)
return DebuggerLocation();
return symbolTable->debuggerLocation();
}
JSValue DebuggerScope::caughtValue(JSGlobalObject* globalObject) const
{
ASSERT(isCatchScope());
JSLexicalEnvironment* catchEnvironment = uncheckedDowncast<JSLexicalEnvironment>(m_scope.get());
SymbolTable* catchSymbolTable = catchEnvironment->symbolTable();
RELEASE_ASSERT(catchSymbolTable->size() == 1);
PropertyName errorName(catchSymbolTable->begin(catchSymbolTable->m_lock)->key.get());
PropertySlot slot(m_scope.get(), PropertySlot::InternalMethodType::Get);
bool success = catchEnvironment->getOwnPropertySlot(catchEnvironment, globalObject, errorName, slot);
RELEASE_ASSERT(success && slot.isValue());
return slot.getValue(globalObject, errorName);
}
Structure* DebuggerScope::createStructure(VM& vm, JSGlobalObject* globalObject)
{
return Structure::create(vm, globalObject, jsNull(), TypeInfo(ObjectType, StructureFlags), info());
}
} // namespace JSC