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JSMockFunction.cpp
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JSMockFunction.cpp
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#include "root.h"
#include "JSMockFunction.h"
#include <JavaScriptCore/JSPromise.h>
#include "ZigGlobalObject.h"
#include <JavaScriptCore/InternalFunction.h>
#include <JavaScriptCore/Completion.h>
#include <JavaScriptCore/ObjectConstructor.h>
#include "ExtendedDOMClientIsoSubspaces.h"
#include "ExtendedDOMIsoSubspaces.h"
#include "BunClientData.h"
#include <JavaScriptCore/LazyProperty.h>
#include <JavaScriptCore/JSCJSValueInlines.h>
#include <JavaScriptCore/JSInternalPromise.h>
#include <JavaScriptCore/LazyPropertyInlines.h>
#include <JavaScriptCore/VMTrapsInlines.h>
#include <JavaScriptCore/Weak.h>
#include <JavaScriptCore/GetterSetter.h>
#include <JavaScriptCore/WeakMapImpl.h>
#include <JavaScriptCore/WeakMapImplInlines.h>
#include <JavaScriptCore/FunctionPrototype.h>
#include <JavaScriptCore/DateInstance.h>
#include <JavaScriptCore/JSModuleEnvironment.h>
#include <JavaScriptCore/JSModuleNamespaceObject.h>
#include "BunPlugin.h"
namespace Bun {
/**
* intended to be used in an if statement as an abstraction over this double if statement
*
* if(jsValue) {
* if(auto value = jsDynamicCast(jsValue)) {
* ...
* }
* }
*
* the reason this is needed is because jsDynamicCast will segfault if given a zero JSValue
*/
template<typename To>
inline To tryJSDynamicCast(JSValue from)
{
if (UNLIKELY(!from))
return nullptr;
if (UNLIKELY(!from.isCell()))
return nullptr;
return jsDynamicCast<To>(from.asCell());
}
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionCall);
JSC_DECLARE_CUSTOM_GETTER(jsMockFunctionGetter_protoImpl);
JSC_DECLARE_CUSTOM_GETTER(jsMockFunctionGetter_mock);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionGetter_mockGetLastCall);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionGetMockImplementation);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionGetMockName);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionMockClear);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionMockReset);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionMockRestore);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionMockImplementation);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionMockImplementationOnce);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionMockName);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionMockReturnThis);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionMockReturnValue);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionMockReturnValueOnce);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionMockResolvedValue);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionMockResolvedValueOnce);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionMockRejectedValue);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionMockRejectedValueOnce);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionWithImplementationCleanup);
JSC_DECLARE_HOST_FUNCTION(jsMockFunctionWithImplementation);
// This is a stub. Exists so that the same code can be run in Jest
extern "C" JSC::EncodedJSValue JSMock__jsUseFakeTimers(JSC::JSGlobalObject* globalObject, JSC::CallFrame* callFrame)
{
return JSValue::encode(callFrame->thisValue());
}
extern "C" JSC::EncodedJSValue JSMock__jsUseRealTimers(JSC::JSGlobalObject* globalObject, JSC::CallFrame* callFrame)
{
globalObject->overridenDateNow = -1;
return JSValue::encode(callFrame->thisValue());
}
extern "C" JSC::EncodedJSValue JSMock__jsNow(JSC::JSGlobalObject* globalObject, JSC::CallFrame* callFrame)
{
return JSValue::encode(jsNumber(globalObject->jsDateNow()));
}
extern "C" JSC::EncodedJSValue JSMock__jsSetSystemTime(JSC::JSGlobalObject* globalObject, JSC::CallFrame* callFrame)
{
JSValue argument0 = callFrame->argument(0);
if (auto* dateInstance = jsDynamicCast<DateInstance*>(argument0)) {
if (std::isnormal(dateInstance->internalNumber())) {
globalObject->overridenDateNow = dateInstance->internalNumber();
}
return JSValue::encode(callFrame->thisValue());
}
if (argument0.isNumber() && argument0.asNumber() > 0) {
globalObject->overridenDateNow = argument0.asNumber();
}
globalObject->overridenDateNow = -1;
return JSValue::encode(callFrame->thisValue());
}
uint64_t JSMockModule::s_nextInvocationId = 0;
// This is taken from JSWeakSet
// We only want to hold onto the list of active spies which haven't already been collected
// So we use a WeakSet
// Unlike using WeakSet from JS, we are able to iterate through the WeakSet.
class ActiveSpySet final : public WeakMapImpl<WeakMapBucket<WeakMapBucketDataKey>> {
public:
using Base = WeakMapImpl<WeakMapBucket<WeakMapBucketDataKey>>;
DECLARE_EXPORT_INFO;
static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(JSWeakSetType, StructureFlags), info());
}
static ActiveSpySet* create(VM& vm, Structure* structure)
{
ActiveSpySet* instance = new (NotNull, allocateCell<ActiveSpySet>(vm)) ActiveSpySet(vm, structure);
instance->finishCreation(vm);
return instance;
}
private:
ActiveSpySet(VM& vm, Structure* structure)
: Base(vm, structure)
{
}
};
static_assert(std::is_final<ActiveSpySet>::value, "Required for JSType based casting");
const ClassInfo ActiveSpySet::s_info = { "ActiveSpySet"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(ActiveSpySet) };
class JSMockImplementation final : public JSNonFinalObject {
public:
enum class Kind : uint8_t {
Call,
ReturnValue,
ReturnThis,
};
static JSMockImplementation* create(JSC::JSGlobalObject* globalObject, JSC::Structure* structure, Kind kind, JSC::JSValue heldValue, bool isOnce)
{
auto& vm = globalObject->vm();
JSMockImplementation* impl = new (NotNull, allocateCell<JSMockImplementation>(vm)) JSMockImplementation(vm, structure, kind);
impl->finishCreation(vm, heldValue, isOnce ? jsNumber(1) : jsUndefined());
return impl;
}
using Base = JSC::JSNonFinalObject;
static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(JSC::ObjectType, StructureFlags), info());
}
template<typename, JSC::SubspaceAccess mode> static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
{
if constexpr (mode == JSC::SubspaceAccess::Concurrently)
return nullptr;
return WebCore::subspaceForImpl<JSMockImplementation, UseCustomHeapCellType::No>(
vm,
[](auto& spaces) { return spaces.m_clientSubspaceForJSMockImplementation.get(); },
[](auto& spaces, auto&& space) { spaces.m_clientSubspaceForJSMockImplementation = std::forward<decltype(space)>(space); },
[](auto& spaces) { return spaces.m_subspaceForJSMockImplementation.get(); },
[](auto& spaces, auto&& space) { spaces.m_subspaceForJSMockImplementation = std::forward<decltype(space)>(space); });
}
// either a function or a return value, depends on kind
mutable JSC::WriteBarrier<JSC::Unknown> underlyingValue;
// a combination of a pointer to the next implementation and a flag indicating if this is a once implementation
// - undefined - no next value
// - jsNumber(1) - no next value + is a once implementation
// - JSMockImplementation - next value + is a once implementation
mutable JSC::WriteBarrier<JSC::Unknown> nextValueOrSentinel;
DECLARE_EXPORT_INFO;
DECLARE_VISIT_CHILDREN;
Kind kind { Kind::ReturnValue };
bool isOnce()
{
return !nextValueOrSentinel.get().isUndefined();
}
JSMockImplementation(JSC::VM& vm, JSC::Structure* structure, Kind kind)
: Base(vm, structure)
, kind(kind)
{
}
void finishCreation(JSC::VM& vm, JSC::JSValue first, JSC::JSValue second)
{
Base::finishCreation(vm);
this->underlyingValue.set(vm, this, first);
this->nextValueOrSentinel.set(vm, this, second);
}
};
template<typename Visitor>
void JSMockImplementation::visitChildrenImpl(JSCell* cell, Visitor& visitor)
{
JSMockImplementation* fn = jsCast<JSMockImplementation*>(cell);
ASSERT_GC_OBJECT_INHERITS(fn, info());
Base::visitChildren(fn, visitor);
visitor.append(fn->underlyingValue);
visitor.append(fn->nextValueOrSentinel);
}
DEFINE_VISIT_CHILDREN(JSMockImplementation);
enum class CallbackKind : uint8_t {
Call,
GetterSetter,
};
const ClassInfo JSMockImplementation::s_info = { "MockImpl"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSMockImplementation) };
class JSMockFunction : public JSC::InternalFunction {
public:
using Base = JSC::InternalFunction;
static constexpr unsigned StructureFlags = Base::StructureFlags;
static JSMockFunction* create(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::Structure* structure, CallbackKind kind = CallbackKind::Call)
{
JSMockFunction* function = new (NotNull, JSC::allocateCell<JSMockFunction>(vm)) JSMockFunction(vm, structure, kind);
function->finishCreation(vm);
return function;
}
static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(InternalFunctionType, StructureFlags), info());
}
DECLARE_INFO;
DECLARE_VISIT_CHILDREN;
JSC::LazyProperty<JSMockFunction, JSObject> mock;
// three pointers to implementation objects
// head of the list, this one is run next
mutable JSC::WriteBarrier<JSC::Unknown> implementation;
// this contains the non-once implementation. there is only ever one of these
mutable JSC::WriteBarrier<JSC::Unknown> fallbackImplmentation;
// the last once implementation
mutable JSC::WriteBarrier<JSC::Unknown> tail;
// original implementation from spy. separate from `implementation` so restoration always works
mutable JSC::WriteBarrier<JSC::Unknown> spyOriginal;
mutable JSC::WriteBarrier<JSC::JSArray> calls;
mutable JSC::WriteBarrier<JSC::JSArray> contexts;
mutable JSC::WriteBarrier<JSC::JSArray> invocationCallOrder;
mutable JSC::WriteBarrier<JSC::JSArray> instances;
mutable JSC::WriteBarrier<JSC::JSArray> returnValues;
JSC::Weak<JSObject> spyTarget;
JSC::Identifier spyIdentifier;
unsigned spyAttributes = 0;
static constexpr unsigned SpyAttributeESModuleNamespace = 1 << 30;
void setName(const WTF::String& name)
{
auto& vm = this->vm();
this->putDirect(vm, vm.propertyNames->name, jsString(vm, name), JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::ReadOnly);
}
void copyNameAndLength(JSC::VM& vm, JSGlobalObject* global, JSC::JSValue value)
{
auto catcher = DECLARE_CATCH_SCOPE(vm);
WTF::String nameToUse;
if (auto* fn = jsDynamicCast<JSFunction*>(value)) {
nameToUse = fn->name(vm);
JSValue lengthJSValue = fn->get(global, vm.propertyNames->length);
if (lengthJSValue.isNumber()) {
this->putDirect(vm, vm.propertyNames->length, (lengthJSValue), JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::ReadOnly);
}
} else if (auto* fn = jsDynamicCast<InternalFunction*>(value)) {
nameToUse = fn->name();
} else {
nameToUse = "mockConstructor"_s;
}
this->setName(nameToUse);
if (catcher.exception()) {
catcher.clearException();
}
}
void initMock()
{
mock.initLater(
[](const JSC::LazyProperty<JSMockFunction, JSObject>::Initializer& init) {
JSMockFunction* mock = init.owner;
Zig::GlobalObject* globalObject = jsCast<Zig::GlobalObject*>(mock->globalObject());
JSC::Structure* structure = globalObject->mockModule.mockObjectStructure.getInitializedOnMainThread(globalObject);
JSObject* object = JSC::constructEmptyObject(init.vm, structure);
object->putDirectOffset(init.vm, 0, mock->getCalls());
object->putDirectOffset(init.vm, 1, mock->getContexts());
object->putDirectOffset(init.vm, 2, mock->getInstances());
object->putDirectOffset(init.vm, 3, mock->getReturnValues());
object->putDirectOffset(init.vm, 4, mock->getInvocationCallOrder());
init.set(object);
});
}
void clear()
{
this->calls.clear();
this->instances.clear();
this->returnValues.clear();
this->contexts.clear();
if (this->mock.isInitialized()) {
this->initMock();
}
}
void reset()
{
this->clear();
this->implementation.clear();
this->fallbackImplmentation.clear();
this->tail.clear();
}
void clearSpy()
{
this->reset();
if (auto* target = this->spyTarget.get()) {
JSValue implValue = this->spyOriginal.get();
if (!implValue) {
implValue = jsUndefined();
}
// Reset the spy back to the original value.
if (this->spyAttributes & SpyAttributeESModuleNamespace) {
auto* moduleNamespaceObject = jsCast<JSModuleNamespaceObject*>(target);
moduleNamespaceObject->overrideExportValue(moduleNamespaceObject->globalObject(), this->spyIdentifier, implValue);
} else {
target->putDirect(this->vm(), this->spyIdentifier, implValue, this->spyAttributes);
}
}
this->spyTarget.clear();
this->spyIdentifier = JSC::Identifier();
this->spyAttributes = 0;
}
JSArray* getCalls() const
{
JSArray* val = calls.get();
if (!val) {
val = JSC::constructEmptyArray(globalObject(), nullptr, 0);
this->calls.set(vm(), this, val);
}
return val;
}
JSArray* getContexts() const
{
JSArray* val = contexts.get();
if (!val) {
val = JSC::constructEmptyArray(globalObject(), nullptr, 0);
this->contexts.set(vm(), this, val);
}
return val;
}
JSArray* getInstances() const
{
JSArray* val = instances.get();
if (!val) {
val = JSC::constructEmptyArray(globalObject(), nullptr, 0);
this->instances.set(vm(), this, val);
}
return val;
}
JSArray* getReturnValues() const
{
JSArray* val = returnValues.get();
if (!val) {
val = JSC::constructEmptyArray(globalObject(), nullptr, 0);
this->returnValues.set(vm(), this, val);
}
return val;
}
JSArray* getInvocationCallOrder() const
{
JSArray* val = invocationCallOrder.get();
if (!val) {
val = JSC::constructEmptyArray(globalObject(), nullptr, 0);
this->invocationCallOrder.set(vm(), this, val);
}
return val;
}
template<typename, JSC::SubspaceAccess mode>
static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
{
if constexpr (mode == JSC::SubspaceAccess::Concurrently)
return nullptr;
return WebCore::subspaceForImpl<JSMockFunction, UseCustomHeapCellType::No>(
vm,
[](auto& spaces) { return spaces.m_clientSubspaceForJSMockFunction.get(); },
[](auto& spaces, auto&& space) { spaces.m_clientSubspaceForJSMockFunction = std::forward<decltype(space)>(space); },
[](auto& spaces) { return spaces.m_subspaceForJSMockFunction.get(); },
[](auto& spaces, auto&& space) { spaces.m_subspaceForJSMockFunction = std::forward<decltype(space)>(space); });
}
JSMockFunction(JSC::VM& vm, JSC::Structure* structure, CallbackKind wrapKind)
: Base(vm, structure, jsMockFunctionCall, jsMockFunctionCall)
{
initMock();
}
};
template<typename Visitor>
void JSMockFunction::visitChildrenImpl(JSCell* cell, Visitor& visitor)
{
JSMockFunction* fn = jsCast<JSMockFunction*>(cell);
ASSERT_GC_OBJECT_INHERITS(fn, info());
Base::visitChildren(fn, visitor);
visitor.append(fn->implementation);
visitor.append(fn->tail);
visitor.append(fn->fallbackImplmentation);
visitor.append(fn->calls);
visitor.append(fn->contexts);
visitor.append(fn->instances);
visitor.append(fn->returnValues);
visitor.append(fn->invocationCallOrder);
visitor.append(fn->spyOriginal);
fn->mock.visit(visitor);
}
DEFINE_VISIT_CHILDREN(JSMockFunction);
static void pushImpl(JSMockFunction* fn, JSGlobalObject* jsGlobalObject, JSMockImplementation::Kind kind, JSValue value)
{
Zig::GlobalObject* globalObject = jsCast<Zig::GlobalObject*>(jsGlobalObject);
auto& vm = globalObject->vm();
if (auto* current = tryJSDynamicCast<JSMockImplementation*>(fn->fallbackImplmentation.get())) {
current->underlyingValue.set(vm, current, value);
current->kind = kind;
return;
}
JSMockImplementation* impl = JSMockImplementation::create(globalObject, globalObject->mockModule.mockImplementationStructure.getInitializedOnMainThread(globalObject), kind, value, false);
fn->fallbackImplmentation.set(vm, fn, impl);
if (auto* tail = tryJSDynamicCast<JSMockImplementation*>(fn->tail.get())) {
tail->nextValueOrSentinel.set(vm, tail, impl);
} else {
fn->implementation.set(vm, fn, impl);
}
}
static void pushImplOnce(JSMockFunction* fn, JSGlobalObject* jsGlobalObject, JSMockImplementation::Kind kind, JSValue value)
{
Zig::GlobalObject* globalObject = jsCast<Zig::GlobalObject*>(jsGlobalObject);
auto& vm = globalObject->vm();
JSMockImplementation* impl = JSMockImplementation::create(globalObject, globalObject->mockModule.mockImplementationStructure.getInitializedOnMainThread(globalObject), kind, value, true);
if (!fn->implementation.get()) {
fn->implementation.set(vm, fn, impl);
}
if (auto* tail = tryJSDynamicCast<JSMockImplementation*>(fn->tail.get())) {
tail->nextValueOrSentinel.set(vm, tail, impl);
} else {
fn->implementation.set(vm, fn, impl);
}
if (auto fallback = fn->fallbackImplmentation.get()) {
impl->nextValueOrSentinel.set(vm, impl, fallback);
}
fn->tail.set(vm, fn, impl);
}
class JSMockFunctionPrototype final : public JSC::JSNonFinalObject {
public:
using Base = JSC::JSNonFinalObject;
static JSMockFunctionPrototype* create(JSC::VM& vm, JSGlobalObject* globalObject, JSC::Structure* structure)
{
JSMockFunctionPrototype* ptr = new (NotNull, JSC::allocateCell<JSMockFunctionPrototype>(vm)) JSMockFunctionPrototype(vm, globalObject, structure);
ptr->finishCreation(vm, globalObject);
return ptr;
}
DECLARE_INFO;
template<typename CellType, JSC::SubspaceAccess>
static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
{
STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(JSMockFunctionPrototype, Base);
return &vm.plainObjectSpace();
}
static JSC::Structure* createStructure(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::JSValue prototype)
{
return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), info());
}
private:
JSMockFunctionPrototype(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::Structure* structure)
: Base(vm, structure)
{
}
void finishCreation(JSC::VM&, JSC::JSGlobalObject*);
};
static const HashTableValue JSMockFunctionPrototypeTableValues[] = {
{ "mock"_s, static_cast<unsigned>(JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute | PropertyAttribute::DontDelete), NoIntrinsic, { HashTableValue::GetterSetterType, jsMockFunctionGetter_mock, 0 } },
{ "_protoImpl"_s, static_cast<unsigned>(JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::CustomAccessor | JSC::PropertyAttribute::DOMAttribute | PropertyAttribute::DontDelete), NoIntrinsic, { HashTableValue::GetterSetterType, jsMockFunctionGetter_protoImpl, 0 } },
{ "getMockImplementation"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionGetMockImplementation, 0 } },
{ "getMockName"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionGetMockName, 0 } },
{ "mockClear"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionMockClear, 0 } },
{ "mockReset"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionMockReset, 0 } },
{ "mockRestore"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionMockRestore, 0 } },
{ "mockImplementation"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionMockImplementation, 1 } },
{ "mockImplementationOnce"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionMockImplementationOnce, 1 } },
{ "withImplementation"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionWithImplementation, 1 } },
{ "mockName"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionMockName, 1 } },
{ "mockReturnThis"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionMockReturnThis, 1 } },
{ "mockReturnValue"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionMockReturnValue, 1 } },
{ "mockReturnValueOnce"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionMockReturnValueOnce, 1 } },
{ "mockResolvedValue"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionMockResolvedValue, 1 } },
{ "mockResolvedValueOnce"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionMockResolvedValueOnce, 1 } },
{ "mockRejectedValue"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionMockRejectedValue, 1 } },
{ "mockRejectedValueOnce"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly), NoIntrinsic, { HashTableValue::NativeFunctionType, jsMockFunctionMockRejectedValueOnce, 1 } },
};
const ClassInfo JSMockFunction::s_info = { "Mock"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSMockFunction) };
class SpyWeakHandleOwner final : public JSC::WeakHandleOwner {
public:
void finalize(JSC::Handle<JSC::Unknown>, void* context) final {}
};
static SpyWeakHandleOwner& weakValueHandleOwner()
{
static NeverDestroyed<SpyWeakHandleOwner> jscWeakValueHandleOwner;
return jscWeakValueHandleOwner;
}
const ClassInfo JSMockFunctionPrototype::s_info = { "Mock"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSMockFunctionPrototype) };
extern "C" void JSMock__resetSpies(Zig::GlobalObject* globalObject)
{
if (!globalObject->mockModule.activeSpies) {
return;
}
auto spiesValue = globalObject->mockModule.activeSpies.get();
ActiveSpySet* activeSpies = jsCast<ActiveSpySet*>(spiesValue);
MarkedArgumentBuffer active;
activeSpies->takeSnapshot(active);
size_t size = active.size();
for (size_t i = 0; i < size; ++i) {
JSValue spy = active.at(i);
if (!spy.isObject())
continue;
auto* spyObject = jsCast<JSMockFunction*>(spy);
spyObject->clearSpy();
}
globalObject->mockModule.activeSpies.clear();
}
extern "C" JSC::EncodedJSValue JSMock__jsRestoreAllMocks(JSC::JSGlobalObject* globalObject, JSC::CallFrame* callframe)
{
JSMock__resetSpies(jsCast<Zig::GlobalObject*>(globalObject));
return JSValue::encode(jsUndefined());
}
extern "C" JSC::EncodedJSValue JSMock__jsSpyOn(JSC::JSGlobalObject* lexicalGlobalObject, JSC::CallFrame* callframe)
{
auto& vm = lexicalGlobalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
auto* globalObject = jsDynamicCast<Zig::GlobalObject*>(lexicalGlobalObject);
if (UNLIKELY(!globalObject)) {
throwVMError(globalObject, scope, "Cannot run spyOn from a different global context"_s);
return {};
}
JSValue objectValue = callframe->argument(0);
JSValue propertyKeyValue = callframe->argument(1);
if (callframe->argumentCount() < 2 || !objectValue.isObject()) {
throwVMError(globalObject, scope, "spyOn(target, prop) expects a target object and a property key"_s);
return {};
}
PropertyName propertyKey = propertyKeyValue.toPropertyKey(globalObject);
RETURN_IF_EXCEPTION(scope, {});
if (propertyKey.isNull()) {
throwVMError(globalObject, scope, "spyOn(target, prop) expects a property key"_s);
return {};
}
JSC::JSObject* object = objectValue.getObject();
if (object->type() == JSC::JSType::GlobalProxyType)
object = jsCast<JSC::JSGlobalProxy*>(object)->target();
JSC::PropertySlot slot(object, JSC::PropertySlot::InternalMethodType::HasProperty);
bool hasValue = object->getPropertySlot(globalObject, propertyKey, slot);
// easymode: regular property or missing property
if (!hasValue || slot.isValue()) {
JSValue value = jsUndefined();
if (hasValue) {
if (UNLIKELY(slot.isTaintedByOpaqueObject())) {
// if it's a Proxy or JSModuleNamespaceObject
value = object->get(globalObject, propertyKey);
} else {
value = slot.getValue(globalObject, propertyKey);
}
if (jsDynamicCast<JSMockFunction*>(value)) {
return JSValue::encode(value);
}
}
auto* mock = JSMockFunction::create(vm, globalObject, globalObject->mockModule.mockFunctionStructure.getInitializedOnMainThread(globalObject), CallbackKind::GetterSetter);
mock->spyTarget = JSC::Weak<JSObject>(object, &weakValueHandleOwner(), nullptr);
mock->spyIdentifier = propertyKey.isSymbol() ? Identifier::fromUid(vm, propertyKey.uid()) : Identifier::fromString(vm, propertyKey.publicName());
mock->spyAttributes = hasValue ? slot.attributes() : 0;
unsigned attributes = 0;
if (hasValue && ((slot.attributes() & PropertyAttribute::Function) != 0 || (value.isCell() && value.isCallable()))) {
if (hasValue)
attributes = slot.attributes();
mock->copyNameAndLength(vm, globalObject, value);
if (JSModuleNamespaceObject* moduleNamespaceObject = jsDynamicCast<JSModuleNamespaceObject*>(object)) {
moduleNamespaceObject->overrideExportValue(globalObject, propertyKey, mock);
mock->spyAttributes |= JSMockFunction::SpyAttributeESModuleNamespace;
} else {
object->putDirect(vm, propertyKey, mock, attributes);
}
RETURN_IF_EXCEPTION(scope, {});
pushImpl(mock, globalObject, JSMockImplementation::Kind::Call, value);
} else {
if (hasValue)
attributes = slot.attributes();
attributes |= PropertyAttribute::Accessor;
if (JSModuleNamespaceObject* moduleNamespaceObject = jsDynamicCast<JSModuleNamespaceObject*>(object)) {
moduleNamespaceObject->overrideExportValue(globalObject, propertyKey, mock);
mock->spyAttributes |= JSMockFunction::SpyAttributeESModuleNamespace;
} else {
object->putDirect(vm, propertyKey, JSC::GetterSetter::create(vm, globalObject, mock, mock), attributes);
}
// mock->setName(propertyKey.publicName());
RETURN_IF_EXCEPTION(scope, {});
pushImpl(mock, globalObject, JSMockImplementation::Kind::ReturnValue, value);
}
mock->spyOriginal.set(vm, mock, value);
if (!globalObject->mockModule.activeSpies) {
ActiveSpySet* activeSpies = ActiveSpySet::create(vm, globalObject->mockModule.activeSpySetStructure.getInitializedOnMainThread(globalObject));
globalObject->mockModule.activeSpies.set(vm, activeSpies);
}
ActiveSpySet* activeSpies = jsCast<ActiveSpySet*>(globalObject->mockModule.activeSpies.get());
activeSpies->add(vm, mock, mock);
return JSValue::encode(mock);
}
// hardmode: accessor property
throwVMError(globalObject, scope, "spyOn(target, prop) does not support accessor properties yet"_s);
return {};
}
JSMockModule JSMockModule::create(JSC::JSGlobalObject* globalObject)
{
JSMockModule mock;
mock.mockFunctionStructure.initLater(
[](const JSC::LazyProperty<JSC::JSGlobalObject, JSC::Structure>::Initializer& init) {
auto* prototype = JSMockFunctionPrototype::create(init.vm, init.owner, JSMockFunctionPrototype::createStructure(init.vm, init.owner, init.owner->functionPrototype()));
init.set(JSMockFunction::createStructure(init.vm, init.owner, prototype));
});
mock.mockResultStructure.initLater(
[](const JSC::LazyProperty<JSC::JSGlobalObject, JSC::Structure>::Initializer& init) {
Zig::GlobalObject* globalObject = jsCast<Zig::GlobalObject*>(init.owner);
JSC::Structure* structure = globalObject->structureCache().emptyObjectStructureForPrototype(
globalObject,
globalObject->objectPrototype(),
2);
JSC::PropertyOffset offset;
structure = structure->addPropertyTransition(
init.vm,
structure,
JSC::Identifier::fromString(init.vm, "type"_s),
0,
offset);
structure = structure->addPropertyTransition(
init.vm,
structure,
JSC::Identifier::fromString(init.vm, "value"_s),
0,
offset);
init.set(structure);
});
mock.activeSpySetStructure.initLater([](const JSC::LazyProperty<JSC::JSGlobalObject, JSC::Structure>::Initializer& init) {
Structure* implementation = ActiveSpySet::createStructure(init.vm, init.owner, jsNull());
init.set(implementation);
});
mock.mockModuleStructure.initLater(
[](const JSC::LazyProperty<JSC::JSGlobalObject, JSC::Structure>::Initializer& init) {
Structure* implementation = createModuleMockStructure(init.vm, init.owner, jsNull());
init.set(implementation);
});
mock.mockImplementationStructure.initLater(
[](const JSC::LazyProperty<JSC::JSGlobalObject, JSC::Structure>::Initializer& init) {
Structure* implementation = JSMockImplementation::createStructure(init.vm, init.owner, jsNull());
init.set(implementation);
});
mock.mockObjectStructure.initLater(
[](const JSC::LazyProperty<JSC::JSGlobalObject, JSC::Structure>::Initializer& init) {
Zig::GlobalObject* globalObject = jsCast<Zig::GlobalObject*>(init.owner);
auto* prototype = JSC::constructEmptyObject(globalObject, globalObject->objectPrototype());
// `putDirectCustomAccessor` doesn't pass the `this` value as expected. unfortunatly we
// need to use a JSFunction for the getter and assign it via `putDirectAccessor` instead.
prototype->putDirectAccessor(
globalObject,
JSC::Identifier::fromString(init.vm, "lastCall"_s),
JSC::GetterSetter::create(
init.vm,
globalObject,
JSC::JSFunction::create(init.vm, init.owner, 0, "lastCall"_s, jsMockFunctionGetter_mockGetLastCall, ImplementationVisibility::Public),
jsUndefined()),
JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly);
JSC::Structure* structure
= globalObject->structureCache().emptyObjectStructureForPrototype(
globalObject,
prototype,
5);
JSC::PropertyOffset offset;
structure = structure->addPropertyTransition(
init.vm,
structure,
JSC::Identifier::fromString(init.vm, "calls"_s),
JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly,
offset);
structure = structure->addPropertyTransition(
init.vm,
structure,
JSC::Identifier::fromString(init.vm, "contexts"_s),
JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly,
offset);
structure = structure->addPropertyTransition(
init.vm,
structure,
JSC::Identifier::fromString(init.vm, "instances"_s),
JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly,
offset);
structure = structure->addPropertyTransition(
init.vm,
structure,
JSC::Identifier::fromString(init.vm, "results"_s),
JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly,
offset);
structure = structure->addPropertyTransition(
init.vm,
structure,
JSC::Identifier::fromString(init.vm, "invocationCallOrder"_s),
JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly,
offset);
init.set(structure);
});
mock.withImplementationCleanupFunction.initLater(
[](const JSC::LazyProperty<JSC::JSGlobalObject, JSC::JSFunction>::Initializer& init) {
init.set(JSC::JSFunction::create(init.vm, init.owner, 2, String(), jsMockFunctionWithImplementationCleanup, ImplementationVisibility::Public));
});
mock.mockWithImplementationCleanupDataStructure.initLater(
[](const JSC::LazyProperty<JSC::JSGlobalObject, Structure>::Initializer& init) {
init.set(Bun::MockWithImplementationCleanupData::createStructure(init.vm, init.owner, init.owner->objectPrototype()));
});
return mock;
}
extern Structure* createMockResultStructure(JSC::VM& vm, JSC::JSGlobalObject* globalObject)
{
JSC::Structure* structure = globalObject->structureCache().emptyObjectStructureForPrototype(
globalObject,
globalObject->objectPrototype(),
2);
JSC::PropertyOffset offset;
structure = structure->addPropertyTransition(
vm,
structure,
JSC::Identifier::fromString(vm, "type"_s),
0,
offset);
structure = structure->addPropertyTransition(
vm,
structure,
JSC::Identifier::fromString(vm, "value"_s),
0, offset);
return structure;
}
static JSValue createMockResult(JSC::VM& vm, Zig::GlobalObject* globalObject, const WTF::String& type, JSC::JSValue value)
{
JSC::Structure* structure = globalObject->mockModule.mockResultStructure.getInitializedOnMainThread(globalObject);
JSC::JSObject* result = JSC::constructEmptyObject(vm, structure);
result->putDirectOffset(vm, 0, jsString(vm, type));
result->putDirectOffset(vm, 1, value);
return result;
}
JSC_DEFINE_HOST_FUNCTION(jsMockFunctionCall, (JSGlobalObject * lexicalGlobalObject, CallFrame* callframe))
{
Zig::GlobalObject* globalObject = jsCast<Zig::GlobalObject*>(lexicalGlobalObject);
auto& vm = globalObject->vm();
JSMockFunction* fn = jsDynamicCast<JSMockFunction*>(callframe->jsCallee());
auto scope = DECLARE_THROW_SCOPE(vm);
if (UNLIKELY(!fn)) {
throwTypeError(globalObject, scope, "Expected callee to be mock function"_s);
return {};
}
JSC::ArgList args = JSC::ArgList(callframe);
JSValue thisValue = callframe->thisValue();
JSC::JSArray* argumentsArray = nullptr;
{
JSC::ObjectInitializationScope object(vm);
argumentsArray = JSC::JSArray::tryCreateUninitializedRestricted(
object,
globalObject->arrayStructureForIndexingTypeDuringAllocation(JSC::ArrayWithContiguous),
callframe->argumentCount());
for (size_t i = 0; i < args.size(); i++) {
argumentsArray->initializeIndex(object, i, args.at(i));
}
}
JSC::JSArray* calls = fn->calls.get();
if (calls) {
calls->push(globalObject, argumentsArray);
} else {
JSC::ObjectInitializationScope object(vm);
calls = JSC::JSArray::tryCreateUninitializedRestricted(
object,
globalObject->arrayStructureForIndexingTypeDuringAllocation(JSC::ArrayWithContiguous),
1);
calls->initializeIndex(object, 0, argumentsArray);
fn->calls.set(vm, fn, calls);
}
JSC::JSArray* contexts = fn->contexts.get();
if (contexts) {
contexts->push(globalObject, thisValue);
} else {
JSC::ObjectInitializationScope object(vm);
contexts = JSC::JSArray::tryCreateUninitializedRestricted(
object,
globalObject->arrayStructureForIndexingTypeDuringAllocation(JSC::ArrayWithContiguous),
1);
contexts->initializeIndex(object, 0, thisValue);
fn->contexts.set(vm, fn, contexts);
}
auto invocationId = JSMockModule::nextInvocationId();
JSC::JSArray* invocationCallOrder = fn->invocationCallOrder.get();
if (invocationCallOrder) {
invocationCallOrder->push(globalObject, jsNumber(invocationId));
} else {
JSC::ObjectInitializationScope object(vm);
invocationCallOrder = JSC::JSArray::tryCreateUninitializedRestricted(
object,
globalObject->arrayStructureForIndexingTypeDuringAllocation(JSC::ArrayWithContiguous),
1);
invocationCallOrder->initializeIndex(object, 0, jsNumber(invocationId));
fn->invocationCallOrder.set(vm, fn, invocationCallOrder);
}
unsigned int returnValueIndex = 0;
auto setReturnValue = [&](JSC::JSValue value) -> void {
if (auto* returnValuesArray = fn->returnValues.get()) {
returnValuesArray->push(globalObject, value);
returnValueIndex = returnValuesArray->length() - 1;
} else {
JSC::ObjectInitializationScope object(vm);
returnValuesArray = JSC::JSArray::tryCreateUninitializedRestricted(
object,
globalObject->arrayStructureForIndexingTypeDuringAllocation(JSC::ArrayWithContiguous),
1);
returnValuesArray->initializeIndex(object, 0, value);
fn->returnValues.set(vm, fn, returnValuesArray);
}
};
if (auto* impl = tryJSDynamicCast<JSMockImplementation*>(fn->implementation.get())) {
if (impl->isOnce()) {
auto next = impl->nextValueOrSentinel.get();
fn->implementation.set(vm, fn, next);
if (next.isNumber() || !jsDynamicCast<JSMockImplementation*>(next)->isOnce()) {
fn->tail.clear();
}
}
switch (impl->kind) {
case JSMockImplementation::Kind::Call: {
JSValue result = impl->underlyingValue.get();
JSC::CallData callData = JSC::getCallData(result);
if (UNLIKELY(callData.type == JSC::CallData::Type::None)) {
throwTypeError(globalObject, scope, "Expected mock implementation to be callable"_s);
return {};
}
setReturnValue(createMockResult(vm, globalObject, "incomplete"_s, jsUndefined()));
WTF::NakedPtr<JSC::Exception> exception;
JSValue returnValue = call(globalObject, result, callData, thisValue, args, exception);
if (auto* exc = exception.get()) {
if (auto* returnValuesArray = fn->returnValues.get()) {
returnValuesArray->putDirectIndex(globalObject, returnValueIndex, createMockResult(vm, globalObject, "throw"_s, exc->value()));
fn->returnValues.set(vm, fn, returnValuesArray);
JSC::throwException(globalObject, scope, exc);
return {};
}
}
if (UNLIKELY(!returnValue)) {
returnValue = jsUndefined();
}
if (auto* returnValuesArray = fn->returnValues.get()) {
returnValuesArray->putDirectIndex(globalObject, returnValueIndex, createMockResult(vm, globalObject, "return"_s, returnValue));
fn->returnValues.set(vm, fn, returnValuesArray);
}
return JSValue::encode(returnValue);
}
case JSMockImplementation::Kind::ReturnValue: {
JSValue returnValue = impl->underlyingValue.get();
setReturnValue(createMockResult(vm, globalObject, "return"_s, returnValue));
return JSValue::encode(returnValue);
}
case JSMockImplementation::Kind::ReturnThis: {
setReturnValue(createMockResult(vm, globalObject, "return"_s, thisValue));
return JSValue::encode(thisValue);
}
default: {
RELEASE_ASSERT_NOT_REACHED();
}
}
}
setReturnValue(createMockResult(vm, globalObject, "return"_s, jsUndefined()));
return JSValue::encode(jsUndefined());
}
void JSMockFunctionPrototype::finishCreation(JSC::VM& vm, JSC::JSGlobalObject* globalObject)
{
Base::finishCreation(vm);
reifyStaticProperties(vm, JSMockFunction::info(), JSMockFunctionPrototypeTableValues, *this);
JSC_TO_STRING_TAG_WITHOUT_TRANSITION();
this->putDirect(vm, Identifier::fromString(vm, "_isMockFunction"_s), jsBoolean(true), 0);
}
JSC_DEFINE_HOST_FUNCTION(jsMockFunctionGetMockImplementation, (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callframe))
{
JSMockFunction* thisObject = jsDynamicCast<JSMockFunction*>(callframe->thisValue().toThis(globalObject, JSC::ECMAMode::strict()));
auto& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
if (UNLIKELY(!thisObject)) {
throwTypeError(globalObject, scope, "Expected Mock"_s);
}