Source/JavaScriptCore/debugger/DebuggerCallFrame.cpp - external/github.com/WebKit/webkit - Git at Google

 /*
  * Copyright (C) 2008, 2013-2014, 2016 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 "DebuggerCallFrame.h"

 #include "CatchScope.h"
 #include "CodeBlock.h"
 #include "DebuggerEvalEnabler.h"
 #include "DebuggerScope.h"
 #include "Interpreter.h"
 #include "JSFunction.h"
 #include "JSWithScope.h"
 #include "ShadowChickenInlines.h"
 #include "StackVisitor.h"
 #include "StrongInlines.h"

 namespace JSC {

 class LineAndColumnFunctor {
 public:
     StackVisitor::Status operator()(StackVisitor& visitor) const
     {
         visitor->computeLineAndColumn(m_line, m_column);
         return StackVisitor::Done;
     }

     unsigned line() const { return m_line; }
     unsigned column() const { return m_column; }

 private:
     mutable unsigned m_line { 0 };
     mutable unsigned m_column { 0 };
 };

 Ref<DebuggerCallFrame> DebuggerCallFrame::create(VM& vm, CallFrame* callFrame)
 {
     if (UNLIKELY(!callFrame)) {
         ShadowChicken::Frame emptyFrame;
         RELEASE_ASSERT(!emptyFrame.isTailDeleted);
         return adoptRef(*new DebuggerCallFrame(vm, callFrame, emptyFrame));
     }

     if (callFrame->isDeprecatedCallFrameForDebugger()) {
         ShadowChicken::Frame emptyFrame;
         RELEASE_ASSERT(!emptyFrame.isTailDeleted);
         return adoptRef(*new DebuggerCallFrame(vm, callFrame, emptyFrame));
     }

     Vector<ShadowChicken::Frame> frames;
     vm.ensureShadowChicken();
     vm.shadowChicken()->iterate(vm, callFrame, [&] (const ShadowChicken::Frame& frame) -> bool {
         frames.append(frame);
         return true;
     });

     RELEASE_ASSERT(frames.size());
     ASSERT(!frames[0].isTailDeleted); // The top frame should never be tail deleted.

     RefPtr<DebuggerCallFrame> currentParent = nullptr;
     // This walks the stack from the entry stack frame to the top of the stack.
     for (unsigned i = frames.size(); i--; ) {
         const ShadowChicken::Frame& frame = frames[i];
         if (!frame.isTailDeleted)
             callFrame = frame.frame;
         Ref<DebuggerCallFrame> currentFrame = adoptRef(*new DebuggerCallFrame(vm, callFrame, frame));
         currentFrame->m_caller = currentParent;
         currentParent = WTFMove(currentFrame);
     }
     return *currentParent;
 }

 DebuggerCallFrame::DebuggerCallFrame(VM& vm, CallFrame* callFrame, const ShadowChicken::Frame& frame)
     : m_validMachineFrame(callFrame)
     , m_shadowChickenFrame(frame)
 {
     m_position = currentPosition(vm);
 }

 RefPtr<DebuggerCallFrame> DebuggerCallFrame::callerFrame()
 {
     ASSERT(isValid());
     if (!isValid())
         return nullptr;

     return m_caller;
 }

 JSGlobalObject* DebuggerCallFrame::globalObject()
 {
     return scope()->globalObject();
 }

 JSC::JSGlobalObject* DebuggerCallFrame::deprecatedVMEntryGlobalObject() const
 {
     ASSERT(isValid());
     if (!isValid())
         return nullptr;
     VM& vm = m_validMachineFrame->deprecatedVM();
     return vm.deprecatedVMEntryGlobalObject(m_validMachineFrame->lexicalGlobalObject(vm));
 }

 SourceID DebuggerCallFrame::sourceID() const
 {
     ASSERT(isValid());
     if (!isValid())
         return noSourceID;
     if (isTailDeleted())
         return m_shadowChickenFrame.codeBlock->ownerExecutable()->sourceID();
     return sourceIDForCallFrame(m_validMachineFrame);
 }

 String DebuggerCallFrame::functionName() const
 {
     ASSERT(isValid());
     if (!isValid())
         return String();

     VM& vm = m_validMachineFrame->deprecatedVM();
     if (isTailDeleted()) {
         if (JSFunction* func = jsDynamicCast<JSFunction*>(vm, m_shadowChickenFrame.callee))
             return func->calculatedDisplayName(vm);
         return m_shadowChickenFrame.codeBlock->inferredName().data();
     }

     return m_validMachineFrame->friendlyFunctionName();
 }

 DebuggerScope* DebuggerCallFrame::scope()
 {
     ASSERT(isValid());
     if (!isValid())
         return nullptr;

     if (!m_scope) {
         VM& vm = m_validMachineFrame->deprecatedVM();
         JSScope* scope;
         CodeBlock* codeBlock = m_validMachineFrame->codeBlock();
         if (isTailDeleted())
             scope = m_shadowChickenFrame.scope;
         else if (codeBlock && codeBlock->scopeRegister().isValid())
             scope = m_validMachineFrame->scope(codeBlock->scopeRegister().offset());
         else if (JSCallee* callee = jsDynamicCast<JSCallee*>(vm, m_validMachineFrame->jsCallee()))
             scope = callee->scope();
         else
             scope = m_validMachineFrame->lexicalGlobalObject(vm)->globalLexicalEnvironment();

         m_scope.set(vm, DebuggerScope::create(vm, scope));
     }
     return m_scope.get();
 }

 DebuggerCallFrame::Type DebuggerCallFrame::type() const
 {
     ASSERT(isValid());
     if (!isValid())
         return ProgramType;

     if (isTailDeleted())
         return FunctionType;

     if (jsDynamicCast<JSFunction*>(m_validMachineFrame->deprecatedVM(), m_validMachineFrame->jsCallee()))
         return FunctionType;

     return ProgramType;
 }

 JSValue DebuggerCallFrame::thisValue(VM& vm) const
 {
     ASSERT(isValid());
     if (!isValid())
         return jsUndefined();

     CodeBlock* codeBlock = nullptr;
     JSValue thisValue;
     if (isTailDeleted()) {
         thisValue = m_shadowChickenFrame.thisValue;
         codeBlock = m_shadowChickenFrame.codeBlock;
     } else {
         thisValue = m_validMachineFrame->thisValue();
         codeBlock = m_validMachineFrame->codeBlock();
     }

     if (!thisValue)
         return jsUndefined();

     ECMAMode ecmaMode = ECMAMode::sloppy();
     if (codeBlock && codeBlock->ownerExecutable()->isInStrictContext())
         ecmaMode = ECMAMode::strict();
     return thisValue.toThis(m_validMachineFrame->lexicalGlobalObject(vm), ecmaMode);
 }

 // Evaluate some JavaScript code in the scope of this frame.
 JSValue DebuggerCallFrame::evaluateWithScopeExtension(const String& script, JSObject* scopeExtensionObject, NakedPtr<Exception>& exception)
 {
     ASSERT(isValid());
     CallFrame* callFrame = m_validMachineFrame;
     if (!callFrame)
         return jsUndefined();

     VM& vm = callFrame->deprecatedVM();
     JSLockHolder lock(vm);
     auto catchScope = DECLARE_CATCH_SCOPE(vm);

     CodeBlock* codeBlock = nullptr;
     if (isTailDeleted())
         codeBlock = m_shadowChickenFrame.codeBlock;
     else
         codeBlock = callFrame->codeBlock();
     if (!codeBlock)
         return jsUndefined();

     JSGlobalObject* globalObject = codeBlock->globalObject();
     DebuggerEvalEnabler evalEnabler(globalObject, DebuggerEvalEnabler::Mode::EvalOnGlobalObjectAtDebuggerEntry);

     EvalContextType evalContextType;

     if (isFunctionParseMode(codeBlock->unlinkedCodeBlock()->parseMode()))
         evalContextType = EvalContextType::FunctionEvalContext;
     else if (codeBlock->unlinkedCodeBlock()->codeType() == EvalCode)
         evalContextType = codeBlock->unlinkedCodeBlock()->evalContextType();
     else
         evalContextType = EvalContextType::None;

     VariableEnvironment variablesUnderTDZ;
     JSScope::collectClosureVariablesUnderTDZ(scope()->jsScope(), variablesUnderTDZ);

     ECMAMode ecmaMode = codeBlock->ownerExecutable()->isInStrictContext() ? ECMAMode::strict() : ECMAMode::sloppy();
     auto* eval = DirectEvalExecutable::create(globalObject, makeSource(script, callFrame->callerSourceOrigin(vm)), codeBlock->unlinkedCodeBlock()->derivedContextType(), codeBlock->unlinkedCodeBlock()->needsClassFieldInitializer(), codeBlock->unlinkedCodeBlock()->isArrowFunction(), codeBlock->ownerExecutable()->isInsideOrdinaryFunction(), evalContextType, &variablesUnderTDZ, ecmaMode);
     if (UNLIKELY(catchScope.exception())) {
         exception = catchScope.exception();
         catchScope.clearException();
         return jsUndefined();
     }

     if (scopeExtensionObject) {
         JSScope* ignoredPreviousScope = globalObject->globalScope();
         globalObject->setGlobalScopeExtension(JSWithScope::create(vm, globalObject, ignoredPreviousScope, scopeExtensionObject));
     }

     JSValue thisValue = this->thisValue(vm);
     JSValue result = vm.interpreter->execute(eval, globalObject, thisValue, scope()->jsScope());
     if (UNLIKELY(catchScope.exception())) {
         exception = catchScope.exception();
         catchScope.clearException();
     }

     if (scopeExtensionObject)
         globalObject->clearGlobalScopeExtension();

     ASSERT(result);
     return result;
 }

 void DebuggerCallFrame::invalidate()
 {
     RefPtr<DebuggerCallFrame> frame = this;
     while (frame) {
         frame->m_validMachineFrame = nullptr;
         if (frame->m_scope) {
             frame->m_scope->invalidateChain();
             frame->m_scope.clear();
         }
         frame = WTFMove(frame->m_caller);
     }
 }

 TextPosition DebuggerCallFrame::currentPosition(VM& vm)
 {
     if (!m_validMachineFrame)
         return TextPosition();

     if (isTailDeleted()) {
         CodeBlock* codeBlock = m_shadowChickenFrame.codeBlock;
         if (Optional<BytecodeIndex> bytecodeIndex = codeBlock->bytecodeIndexFromCallSiteIndex(m_shadowChickenFrame.callSiteIndex)) {
             return TextPosition(OrdinalNumber::fromOneBasedInt(codeBlock->lineNumberForBytecodeIndex(*bytecodeIndex)),
                 OrdinalNumber::fromOneBasedInt(codeBlock->columnNumberForBytecodeIndex(*bytecodeIndex)));
         }
     }

     return positionForCallFrame(vm, m_validMachineFrame);
 }

 TextPosition DebuggerCallFrame::positionForCallFrame(VM& vm, CallFrame* callFrame)
 {
     LineAndColumnFunctor functor;
     StackVisitor::visit(callFrame, vm, functor);
     return TextPosition(OrdinalNumber::fromOneBasedInt(functor.line()), OrdinalNumber::fromOneBasedInt(functor.column()));
 }

 SourceID DebuggerCallFrame::sourceIDForCallFrame(CallFrame* callFrame)
 {
     if (!callFrame)
         return noSourceID;
     CodeBlock* codeBlock = callFrame->codeBlock();
     if (!codeBlock || callFrame->callee().isWasm())
         return noSourceID;
     return codeBlock->ownerExecutable()->sourceID();
 }

 } // namespace JSC
	/*
	* Copyright (C) 2008, 2013-2014, 2016 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 "DebuggerCallFrame.h"

	#include "CatchScope.h"
	#include "CodeBlock.h"
	#include "DebuggerEvalEnabler.h"
	#include "DebuggerScope.h"
	#include "Interpreter.h"
	#include "JSFunction.h"
	#include "JSWithScope.h"
	#include "ShadowChickenInlines.h"
	#include "StackVisitor.h"
	#include "StrongInlines.h"

	namespace JSC {

	class LineAndColumnFunctor {
	public:
	StackVisitor::Status operator()(StackVisitor& visitor) const
	{
	visitor->computeLineAndColumn(m_line, m_column);
	return StackVisitor::Done;
	}

	unsigned line() const { return m_line; }
	unsigned column() const { return m_column; }

	private:
	mutable unsigned m_line { 0 };
	mutable unsigned m_column { 0 };
	};

	Ref<DebuggerCallFrame> DebuggerCallFrame::create(VM& vm, CallFrame* callFrame)
	{
	if (UNLIKELY(!callFrame)) {
	ShadowChicken::Frame emptyFrame;
	RELEASE_ASSERT(!emptyFrame.isTailDeleted);
	return adoptRef(*new DebuggerCallFrame(vm, callFrame, emptyFrame));
	}

	if (callFrame->isDeprecatedCallFrameForDebugger()) {
	ShadowChicken::Frame emptyFrame;
	RELEASE_ASSERT(!emptyFrame.isTailDeleted);
	return adoptRef(*new DebuggerCallFrame(vm, callFrame, emptyFrame));
	}

	Vector<ShadowChicken::Frame> frames;
	vm.ensureShadowChicken();
	vm.shadowChicken()->iterate(vm, callFrame, [&] (const ShadowChicken::Frame& frame) -> bool {
	frames.append(frame);
	return true;
	});

	RELEASE_ASSERT(frames.size());
	ASSERT(!frames[0].isTailDeleted); // The top frame should never be tail deleted.

	RefPtr<DebuggerCallFrame> currentParent = nullptr;
	// This walks the stack from the entry stack frame to the top of the stack.
	for (unsigned i = frames.size(); i--; ) {
	const ShadowChicken::Frame& frame = frames[i];
	if (!frame.isTailDeleted)
	callFrame = frame.frame;
	Ref<DebuggerCallFrame> currentFrame = adoptRef(*new DebuggerCallFrame(vm, callFrame, frame));
	currentFrame->m_caller = currentParent;
	currentParent = WTFMove(currentFrame);
	}
	return *currentParent;
	}

	DebuggerCallFrame::DebuggerCallFrame(VM& vm, CallFrame* callFrame, const ShadowChicken::Frame& frame)
	: m_validMachineFrame(callFrame)
	, m_shadowChickenFrame(frame)
	{
	m_position = currentPosition(vm);
	}

	RefPtr<DebuggerCallFrame> DebuggerCallFrame::callerFrame()
	{
	ASSERT(isValid());
	if (!isValid())
	return nullptr;

	return m_caller;
	}

	JSGlobalObject* DebuggerCallFrame::globalObject()
	{
	return scope()->globalObject();
	}

	JSC::JSGlobalObject* DebuggerCallFrame::deprecatedVMEntryGlobalObject() const
	{
	ASSERT(isValid());
	if (!isValid())
	return nullptr;
	VM& vm = m_validMachineFrame->deprecatedVM();
	return vm.deprecatedVMEntryGlobalObject(m_validMachineFrame->lexicalGlobalObject(vm));
	}

	SourceID DebuggerCallFrame::sourceID() const
	{
	ASSERT(isValid());
	if (!isValid())
	return noSourceID;
	if (isTailDeleted())
	return m_shadowChickenFrame.codeBlock->ownerExecutable()->sourceID();
	return sourceIDForCallFrame(m_validMachineFrame);
	}

	String DebuggerCallFrame::functionName() const
	{
	ASSERT(isValid());
	if (!isValid())
	return String();

	VM& vm = m_validMachineFrame->deprecatedVM();
	if (isTailDeleted()) {
	if (JSFunction* func = jsDynamicCast<JSFunction*>(vm, m_shadowChickenFrame.callee))
	return func->calculatedDisplayName(vm);
	return m_shadowChickenFrame.codeBlock->inferredName().data();
	}

	return m_validMachineFrame->friendlyFunctionName();
	}

	DebuggerScope* DebuggerCallFrame::scope()
	{
	ASSERT(isValid());
	if (!isValid())
	return nullptr;

	if (!m_scope) {
	VM& vm = m_validMachineFrame->deprecatedVM();
	JSScope* scope;
	CodeBlock* codeBlock = m_validMachineFrame->codeBlock();
	if (isTailDeleted())
	scope = m_shadowChickenFrame.scope;
	else if (codeBlock && codeBlock->scopeRegister().isValid())
	scope = m_validMachineFrame->scope(codeBlock->scopeRegister().offset());
	else if (JSCallee* callee = jsDynamicCast<JSCallee*>(vm, m_validMachineFrame->jsCallee()))
	scope = callee->scope();
	else
	scope = m_validMachineFrame->lexicalGlobalObject(vm)->globalLexicalEnvironment();

	m_scope.set(vm, DebuggerScope::create(vm, scope));
	}
	return m_scope.get();
	}

	DebuggerCallFrame::Type DebuggerCallFrame::type() const
	{
	ASSERT(isValid());
	if (!isValid())
	return ProgramType;

	if (isTailDeleted())
	return FunctionType;

	if (jsDynamicCast<JSFunction*>(m_validMachineFrame->deprecatedVM(), m_validMachineFrame->jsCallee()))
	return FunctionType;

	return ProgramType;
	}

	JSValue DebuggerCallFrame::thisValue(VM& vm) const
	{
	ASSERT(isValid());
	if (!isValid())
	return jsUndefined();

	CodeBlock* codeBlock = nullptr;
	JSValue thisValue;
	if (isTailDeleted()) {
	thisValue = m_shadowChickenFrame.thisValue;
	codeBlock = m_shadowChickenFrame.codeBlock;
	} else {
	thisValue = m_validMachineFrame->thisValue();
	codeBlock = m_validMachineFrame->codeBlock();
	}

	if (!thisValue)
	return jsUndefined();

	ECMAMode ecmaMode = ECMAMode::sloppy();
	if (codeBlock && codeBlock->ownerExecutable()->isInStrictContext())
	ecmaMode = ECMAMode::strict();
	return thisValue.toThis(m_validMachineFrame->lexicalGlobalObject(vm), ecmaMode);
	}

	// Evaluate some JavaScript code in the scope of this frame.
	JSValue DebuggerCallFrame::evaluateWithScopeExtension(const String& script, JSObject* scopeExtensionObject, NakedPtr<Exception>& exception)
	{
	ASSERT(isValid());
	CallFrame* callFrame = m_validMachineFrame;
	if (!callFrame)
	return jsUndefined();

	VM& vm = callFrame->deprecatedVM();
	JSLockHolder lock(vm);
	auto catchScope = DECLARE_CATCH_SCOPE(vm);

	CodeBlock* codeBlock = nullptr;
	if (isTailDeleted())
	codeBlock = m_shadowChickenFrame.codeBlock;
	else
	codeBlock = callFrame->codeBlock();
	if (!codeBlock)
	return jsUndefined();

	JSGlobalObject* globalObject = codeBlock->globalObject();
	DebuggerEvalEnabler evalEnabler(globalObject, DebuggerEvalEnabler::Mode::EvalOnGlobalObjectAtDebuggerEntry);

	EvalContextType evalContextType;

	if (isFunctionParseMode(codeBlock->unlinkedCodeBlock()->parseMode()))
	evalContextType = EvalContextType::FunctionEvalContext;
	else if (codeBlock->unlinkedCodeBlock()->codeType() == EvalCode)
	evalContextType = codeBlock->unlinkedCodeBlock()->evalContextType();
	else
	evalContextType = EvalContextType::None;

	VariableEnvironment variablesUnderTDZ;
	JSScope::collectClosureVariablesUnderTDZ(scope()->jsScope(), variablesUnderTDZ);

	ECMAMode ecmaMode = codeBlock->ownerExecutable()->isInStrictContext() ? ECMAMode::strict() : ECMAMode::sloppy();
	auto* eval = DirectEvalExecutable::create(globalObject, makeSource(script, callFrame->callerSourceOrigin(vm)), codeBlock->unlinkedCodeBlock()->derivedContextType(), codeBlock->unlinkedCodeBlock()->needsClassFieldInitializer(), codeBlock->unlinkedCodeBlock()->isArrowFunction(), codeBlock->ownerExecutable()->isInsideOrdinaryFunction(), evalContextType, &variablesUnderTDZ, ecmaMode);
	if (UNLIKELY(catchScope.exception())) {
	exception = catchScope.exception();
	catchScope.clearException();
	return jsUndefined();
	}

	if (scopeExtensionObject) {
	JSScope* ignoredPreviousScope = globalObject->globalScope();
	globalObject->setGlobalScopeExtension(JSWithScope::create(vm, globalObject, ignoredPreviousScope, scopeExtensionObject));
	}

	JSValue thisValue = this->thisValue(vm);
	JSValue result = vm.interpreter->execute(eval, globalObject, thisValue, scope()->jsScope());
	if (UNLIKELY(catchScope.exception())) {
	exception = catchScope.exception();
	catchScope.clearException();
	}

	if (scopeExtensionObject)
	globalObject->clearGlobalScopeExtension();

	ASSERT(result);
	return result;
	}

	void DebuggerCallFrame::invalidate()
	{
	RefPtr<DebuggerCallFrame> frame = this;
	while (frame) {
	frame->m_validMachineFrame = nullptr;
	if (frame->m_scope) {
	frame->m_scope->invalidateChain();
	frame->m_scope.clear();
	}
	frame = WTFMove(frame->m_caller);
	}
	}

	TextPosition DebuggerCallFrame::currentPosition(VM& vm)
	{
	if (!m_validMachineFrame)
	return TextPosition();

	if (isTailDeleted()) {
	CodeBlock* codeBlock = m_shadowChickenFrame.codeBlock;
	if (Optional<BytecodeIndex> bytecodeIndex = codeBlock->bytecodeIndexFromCallSiteIndex(m_shadowChickenFrame.callSiteIndex)) {
	return TextPosition(OrdinalNumber::fromOneBasedInt(codeBlock->lineNumberForBytecodeIndex(*bytecodeIndex)),
	OrdinalNumber::fromOneBasedInt(codeBlock->columnNumberForBytecodeIndex(*bytecodeIndex)));
	}
	}

	return positionForCallFrame(vm, m_validMachineFrame);
	}

	TextPosition DebuggerCallFrame::positionForCallFrame(VM& vm, CallFrame* callFrame)
	{
	LineAndColumnFunctor functor;
	StackVisitor::visit(callFrame, vm, functor);
	return TextPosition(OrdinalNumber::fromOneBasedInt(functor.line()), OrdinalNumber::fromOneBasedInt(functor.column()));
	}

	SourceID DebuggerCallFrame::sourceIDForCallFrame(CallFrame* callFrame)
	{
	if (!callFrame)
	return noSourceID;
	CodeBlock* codeBlock = callFrame->codeBlock();
	if (!codeBlock \|\| callFrame->callee().isWasm())
	return noSourceID;
	return codeBlock->ownerExecutable()->sourceID();
	}

	} // namespace JSC