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JavascriptFunction.cpp
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JavascriptFunction.cpp
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//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------
#include "RuntimeLibraryPch.h"
#include "Library/StackScriptFunction.h"
#include "Types/SpreadArgument.h"
#include "Language/AsmJsTypes.h"
#ifdef _M_X64
#include "ByteCode/PropertyIdArray.h"
#include "Language/AsmJsModule.h"
#endif
#ifdef _M_IX86
#ifdef _CONTROL_FLOW_GUARD
extern "C" PVOID __guard_check_icall_fptr;
#endif
extern "C" void __cdecl _alloca_probe_16();
#endif
using namespace Js;
// The VS2013 linker treats this as a redefinition of an already
// defined constant and complains. So skip the declaration if we're compiling
// with VS2013 or below.
#if !defined(_MSC_VER) || _MSC_VER >= 1900
const charcount_t JavascriptFunction::DIAG_MAX_FUNCTION_STRING;
#endif
DEFINE_RECYCLER_TRACKER_PERF_COUNTER(JavascriptFunction);
JavascriptFunction::JavascriptFunction(DynamicType * type)
: DynamicObject(type), functionInfo(nullptr), constructorCache(&ConstructorCache::DefaultInstance)
{
Assert(this->constructorCache != nullptr);
}
JavascriptFunction::JavascriptFunction(DynamicType * type, FunctionInfo * functionInfo)
: DynamicObject(type), functionInfo(functionInfo), constructorCache(&ConstructorCache::DefaultInstance)
{
Assert(this->constructorCache != nullptr);
this->GetTypeHandler()->ClearHasOnlyWritableDataProperties(); // length is non-writable
if (GetTypeHandler()->GetFlags() & DynamicTypeHandler::IsPrototypeFlag)
{
// No need to invalidate store field caches for non-writable properties here. Since this type is just being created, it cannot represent
// an object that is already a prototype. If it becomes a prototype and then we attempt to add a property to an object derived from this
// object, then we will check if this property is writable, and only if it is will we do the fast path for add property.
// GetScriptContext()->InvalidateStoreFieldCaches(PropertyIds::length);
GetLibrary()->GetTypesWithOnlyWritablePropertyProtoChainCache()->Clear();
}
}
JavascriptFunction::JavascriptFunction(DynamicType * type, FunctionInfo * functionInfo, ConstructorCache* cache)
: DynamicObject(type), functionInfo(functionInfo), constructorCache(cache)
{
Assert(this->constructorCache != nullptr);
this->GetTypeHandler()->ClearHasOnlyWritableDataProperties(); // length is non-writable
if (GetTypeHandler()->GetFlags() & DynamicTypeHandler::IsPrototypeFlag)
{
// No need to invalidate store field caches for non-writable properties here. Since this type is just being created, it cannot represent
// an object that is already a prototype. If it becomes a prototype and then we attempt to add a property to an object derived from this
// object, then we will check if this property is writable, and only if it is will we do the fast path for add property.
// GetScriptContext()->InvalidateStoreFieldCaches(PropertyIds::length);
GetLibrary()->GetTypesWithOnlyWritablePropertyProtoChainCache()->Clear();
}
}
FunctionProxy *JavascriptFunction::GetFunctionProxy() const
{
Assert(functionInfo != nullptr);
return functionInfo->GetFunctionProxy();
}
ParseableFunctionInfo *JavascriptFunction::GetParseableFunctionInfo() const
{
Assert(functionInfo != nullptr);
return functionInfo->GetParseableFunctionInfo();
}
DeferDeserializeFunctionInfo *JavascriptFunction::GetDeferDeserializeFunctionInfo() const
{
Assert(functionInfo != nullptr);
return functionInfo->GetDeferDeserializeFunctionInfo();
}
FunctionBody *JavascriptFunction::GetFunctionBody() const
{
Assert(functionInfo != nullptr);
return functionInfo->GetFunctionBody();
}
BOOL JavascriptFunction::IsScriptFunction() const
{
Assert(functionInfo != nullptr);
return functionInfo->HasBody();
}
template <> bool Js::VarIsImpl<JavascriptFunction>(RecyclableObject* obj)
{
return JavascriptOperators::GetTypeId(obj) == TypeIds_Function;
}
BOOL JavascriptFunction::IsStrictMode() const
{
FunctionProxy * proxy = this->GetFunctionProxy();
return proxy && proxy->EnsureDeserialized()->GetIsStrictMode();
}
BOOL JavascriptFunction::IsLambda() const
{
return this->GetFunctionInfo()->IsLambda();
}
BOOL JavascriptFunction::IsConstructor() const
{
return this->GetFunctionInfo()->IsConstructor();
}
#if DBG
/* static */
bool JavascriptFunction::IsBuiltinProperty(Var objectWithProperty, PropertyIds propertyId)
{
return VarIs<ScriptFunctionBase>(objectWithProperty)
&& (propertyId == PropertyIds::length || (VarTo<JavascriptFunction>(objectWithProperty)->HasRestrictedProperties() && (propertyId == PropertyIds::arguments || propertyId == PropertyIds::caller)));
}
#endif
Var JavascriptFunction::NewInstanceHelper(ScriptContext *scriptContext, RecyclableObject* function, CallInfo callInfo, Js::ArgumentReader& args, FunctionKind functionKind /* = FunctionKind::Normal */)
{
JavascriptLibrary* library = function->GetLibrary();
AssertMsg(args.Info.Count > 0, "Should always have implicit 'this'");
bool isAsync = functionKind == FunctionKind::Async || functionKind == FunctionKind::AsyncGenerator;
bool isGenerator = functionKind == FunctionKind::Generator || functionKind == FunctionKind::AsyncGenerator;
// SkipDefaultNewObject function flag should have prevented the default object from
// being created, except when call true a host dispatch.
Var newTarget = args.GetNewTarget();
bool isCtorSuperCall = JavascriptOperators::GetAndAssertIsConstructorSuperCall(args);
JavascriptString* separator = library->GetCommaDisplayString();
// Gather all the formals into a string like (fml1, fml2, fml3)
JavascriptString *formals = library->GetOpenRBracketString();
for (uint i = 1; i < args.Info.Count - 1; ++i)
{
if (i != 1)
{
formals = JavascriptString::Concat(formals, separator);
}
formals = JavascriptString::Concat(formals, JavascriptConversion::ToString(args.Values[i], scriptContext));
}
formals = JavascriptString::Concat(formals, library->GetNewLineCloseRBracketString());
// Function body, last argument to Function(...)
JavascriptString *fnBody = NULL;
if (args.Info.Count > 1)
{
fnBody = JavascriptConversion::ToString(args.Values[args.Info.Count - 1], scriptContext);
}
// Create a string representing the anonymous function
Assert(
0 + // "function anonymous" GetFunctionAnonymousString
0 + // "(" GetOpenRBracketString
1 + // "\n)" GetNewLineCloseRBracketString
0 // " {" GetSpaceOpenBracketString
== numberLinesPrependedToAnonymousFunction); // Be sure to add exactly one line to anonymous function
JavascriptString *bs = functionKind == FunctionKind::Async ?
library->GetAsyncFunctionAnonymousString() :
functionKind == FunctionKind::Generator ?
library->GetFunctionPTRAnonymousString() :
functionKind == FunctionKind::AsyncGenerator ?
library->GetAsyncGeneratorAnonymousString() :
library->GetFunctionAnonymousString();
bs = JavascriptString::Concat(bs, formals);
bs = JavascriptString::Concat(bs, library->GetSpaceOpenBracketString());
if (fnBody != NULL)
{
bs = JavascriptString::Concat(bs, fnBody);
}
bs = JavascriptString::Concat(bs, library->GetNewLineCloseBracketString());
// Bug 1105479. Get the module id from the caller
ModuleID moduleID = kmodGlobal;
BOOL strictMode = FALSE;
JavascriptFunction* pfuncScript;
FunctionInfo *pfuncInfoCache = NULL;
char16 const * sourceString = bs->GetSz();
charcount_t sourceLen = bs->GetLength();
EvalMapString key(bs, sourceString, sourceLen, moduleID, strictMode, /* isLibraryCode = */ false);
if (!scriptContext->IsInNewFunctionMap(key, &pfuncInfoCache))
{
// Validate formals here
scriptContext->GetGlobalObject()->ValidateSyntax(
scriptContext, formals->GetSz(), formals->GetLength(),
isGenerator, isAsync,
&Parser::ValidateFormals);
if (fnBody != NULL)
{
// Validate function body
scriptContext->GetGlobalObject()->ValidateSyntax(
scriptContext, fnBody->GetSz(), fnBody->GetLength(),
isGenerator, isAsync,
&Parser::ValidateSourceElementList);
}
pfuncScript = scriptContext->GetGlobalObject()->EvalHelper(scriptContext, sourceString, sourceLen, moduleID, fscrCanDeferFncParse, Constants::FunctionCode, TRUE, TRUE, strictMode);
// Indicate that this is a top-level function. We don't pass the fscrGlobalCode flag to the eval helper,
// or it will return the global function that wraps the declared function body, as though it were an eval.
// But we want, for instance, to be able to verify that we did the right amount of deferred parsing.
ParseableFunctionInfo *functionInfo = pfuncScript->GetParseableFunctionInfo();
Assert(functionInfo);
functionInfo->SetGrfscr(functionInfo->GetGrfscr() | fscrGlobalCode);
#if ENABLE_TTD
if(!scriptContext->IsTTDRecordOrReplayModeEnabled())
{
scriptContext->AddToNewFunctionMap(key, functionInfo->GetFunctionInfo());
}
#else
scriptContext->AddToNewFunctionMap(key, functionInfo->GetFunctionInfo());
#endif
}
else if (pfuncInfoCache->IsCoroutine())
{
pfuncScript = scriptContext->GetLibrary()->CreateGeneratorVirtualScriptFunction(pfuncInfoCache->GetFunctionProxy());
}
else
{
pfuncScript = scriptContext->GetLibrary()->CreateScriptFunction(pfuncInfoCache->GetFunctionProxy());
}
#if ENABLE_TTD
//
//TODO: We may (probably?) want to use the debugger source rundown functionality here instead
//
if(pfuncScript != nullptr && (scriptContext->IsTTDRecordModeEnabled() || scriptContext->ShouldPerformReplayAction()))
{
//Make sure we have the body and text information available
FunctionBody* globalBody = TTD::JsSupport::ForceAndGetFunctionBody(pfuncScript->GetParseableFunctionInfo());
if(!scriptContext->TTDContextInfo->IsBodyAlreadyLoadedAtTopLevel(globalBody))
{
uint32 bodyIdCtr = 0;
if(scriptContext->IsTTDRecordModeEnabled())
{
const TTD::NSSnapValues::TopLevelNewFunctionBodyResolveInfo* tbfi = scriptContext->GetThreadContext()->TTDLog->AddNewFunction(globalBody, moduleID, sourceString, sourceLen);
//We always want to register the top-level load but we don't always need to log the event
if(scriptContext->ShouldPerformRecordAction())
{
scriptContext->GetThreadContext()->TTDLog->RecordTopLevelCodeAction(tbfi->TopLevelBase.TopLevelBodyCtr);
}
bodyIdCtr = tbfi->TopLevelBase.TopLevelBodyCtr;
}
if(scriptContext->ShouldPerformReplayAction())
{
bodyIdCtr = scriptContext->GetThreadContext()->TTDLog->ReplayTopLevelCodeAction();
}
//walk global body to (1) add functions to pin set (2) build parent map
scriptContext->TTDContextInfo->ProcessFunctionBodyOnLoad(globalBody, nullptr);
scriptContext->TTDContextInfo->RegisterNewScript(globalBody, bodyIdCtr);
if(scriptContext->ShouldPerformRecordOrReplayAction())
{
globalBody->GetUtf8SourceInfo()->SetSourceInfoForDebugReplay_TTD(bodyIdCtr);
}
if(scriptContext->ShouldPerformReplayDebuggerAction())
{
scriptContext->GetThreadContext()->TTDExecutionInfo->ProcessScriptLoad(scriptContext, bodyIdCtr, globalBody, globalBody->GetUtf8SourceInfo(), nullptr);
}
}
}
#endif
JS_ETW(EventWriteJSCRIPT_RECYCLER_ALLOCATE_FUNCTION(pfuncScript, EtwTrace::GetFunctionId(pfuncScript->GetFunctionProxy())));
if (isGenerator || isAsync)
{
Assert(pfuncScript->GetFunctionInfo()->IsCoroutine());
auto pfuncVirt = static_cast<GeneratorVirtualScriptFunction*>(pfuncScript);
auto pfuncGen = functionKind == FunctionKind::Async ?
scriptContext->GetLibrary()->CreateAsyncFunction(JavascriptAsyncFunction::EntryAsyncFunctionImplementation, pfuncVirt) :
functionKind == FunctionKind::AsyncGenerator ?
scriptContext->GetLibrary()->CreateAsyncGeneratorFunction(JavascriptAsyncGeneratorFunction::EntryAsyncGeneratorFunctionImplementation, pfuncVirt) :
scriptContext->GetLibrary()->CreateGeneratorFunction(JavascriptGeneratorFunction::EntryGeneratorFunctionImplementation, pfuncVirt);
pfuncVirt->SetRealGeneratorFunction(pfuncGen);
pfuncScript = pfuncGen;
}
return isCtorSuperCall ?
JavascriptOperators::OrdinaryCreateFromConstructor(VarTo<RecyclableObject>(newTarget), pfuncScript, nullptr, scriptContext) :
pfuncScript;
}
Var JavascriptFunction::NewInstanceRestrictedMode(RecyclableObject* function, CallInfo callInfo, ...)
{
ScriptContext* scriptContext = function->GetScriptContext();
scriptContext->CheckEvalRestriction();
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
return NewInstanceHelper(scriptContext, function, callInfo, args);
}
Var JavascriptFunction::NewInstance(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
ScriptContext* scriptContext = function->GetScriptContext();
return NewInstanceHelper(scriptContext, function, callInfo, args);
}
Var JavascriptFunction::NewAsyncGeneratorFunctionInstance(RecyclableObject* function, CallInfo callInfo, ...)
{
// Get called when creating a new async generator function through the constructor (e.g. agf.__proto__.constructor)
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
return JavascriptFunction::NewInstanceHelper(function->GetScriptContext(), function, callInfo, args, JavascriptFunction::FunctionKind::AsyncGenerator);
}
Var JavascriptFunction::NewAsyncGeneratorFunctionInstanceRestrictedMode(RecyclableObject* function, CallInfo callInfo, ...)
{
ScriptContext* scriptContext = function->GetScriptContext();
scriptContext->CheckEvalRestriction();
PROBE_STACK(scriptContext, Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
return JavascriptFunction::NewInstanceHelper(scriptContext, function, callInfo, args, JavascriptFunction::FunctionKind::AsyncGenerator);
}
Var JavascriptFunction::NewAsyncFunctionInstance(RecyclableObject* function, CallInfo callInfo, ...)
{
// Get called when creating a new async function through the constructor (e.g. af.__proto__.constructor)
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
return JavascriptFunction::NewInstanceHelper(function->GetScriptContext(), function, callInfo, args, JavascriptFunction::FunctionKind::Async);
}
Var JavascriptFunction::NewAsyncFunctionInstanceRestrictedMode(RecyclableObject* function, CallInfo callInfo, ...)
{
ScriptContext* scriptContext = function->GetScriptContext();
scriptContext->CheckEvalRestriction();
PROBE_STACK(scriptContext, Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
return JavascriptFunction::NewInstanceHelper(scriptContext, function, callInfo, args, JavascriptFunction::FunctionKind::Async);
}
//
// Dummy EntryPoint for Function.prototype
//
Var JavascriptFunction::PrototypeEntryPoint(RecyclableObject* function, CallInfo callInfo, ...)
{
ARGUMENTS(args, callInfo);
ScriptContext* scriptContext = function->GetScriptContext();
JavascriptLibrary* library = function->GetLibrary();
AssertMsg(args.Info.Count > 0, "Should always have implicit 'this'");
if (callInfo.Flags & CallFlags_New)
{
JavascriptError::ThrowTypeError(scriptContext, VBSERR_ActionNotSupported);
}
return library->GetUndefined();
}
enum : unsigned { STACK_ARGS_ALLOCA_THRESHOLD = 8 }; // Number of stack args we allow before using _alloca
// ES5 15.3.4.3
//When the apply method is called on an object func with arguments thisArg and argArray the following steps are taken:
// 1. If IsCallable(func) is false, then throw a TypeError exception.
// 2. If argArray is null or undefined, then
// a. Return the result of calling the [[Call]] internal method of func, providing thisArg as the this value and an empty list of arguments.
// 3. If Type(argArray) is not Object, then throw a TypeError exception.
// 4. Let len be the result of calling the [[Get]] internal method of argArray with argument "length".
//
// Steps 5 and 7 deleted from July 19 Errata of ES5 spec
//
// 5. If len is null or undefined, then throw a TypeError exception.
// 6. Len n be ToUint32(len).
// 7. If n is not equal to ToNumber(len), then throw a TypeError exception.
// 8. Let argList be an empty List.
// 9. Let index be 0.
// 10. Repeat while index < n
// a. Let indexName be ToString(index).
// b. Let nextArg be the result of calling the [[Get]] internal method of argArray with indexName as the argument.
// c. Append nextArg as the last element of argList.
// d. Set index to index + 1.
// 11. Return the result of calling the [[Call]] internal method of func, providing thisArg as the this value and argList as the list of arguments.
// The length property of the apply method is 2.
Var JavascriptFunction::EntryApply(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
// Ideally, we want to maintain CallFlags_Eval behavior and pass along the extra FrameDisplay parameter
// but that we would be a bigger change than what we want to do in this ship cycle. See WIN8: 915315.
// If eval is executed using apply it will not get the frame display and always execute in global scope.
ARGUMENTS(args, callInfo);
ScriptContext* scriptContext = function->GetScriptContext();
Assert(!(callInfo.Flags & CallFlags_New));
///
/// Check Argument[0] has internal [[Call]] property
/// If not, throw TypeError
///
if (args.Info.Count == 0 || !JavascriptConversion::IsCallable(args[0]))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_This_NeedFunction, _u("Function.prototype.apply"));
}
Var thisVar = NULL;
Var argArray = NULL;
RecyclableObject* pFunc = VarTo<RecyclableObject>(args[0]);
if (args.Info.Count == 1)
{
thisVar = scriptContext->GetLibrary()->GetUndefined();
}
else if (args.Info.Count == 2)
{
thisVar = args.Values[1];
}
else if (args.Info.Count > 2)
{
thisVar = args.Values[1];
argArray = args.Values[2];
}
BEGIN_SAFE_REENTRANT_CALL(scriptContext->GetThreadContext())
{
return CalloutHelper<false>(pFunc, thisVar, /* overridingNewTarget = */nullptr, argArray, scriptContext);
}
END_SAFE_REENTRANT_CALL
}
template <bool isConstruct>
Var JavascriptFunction::CalloutHelper(RecyclableObject* pFunc, Var thisVar, Var overridingNewTarget, Var argArray, ScriptContext* scriptContext)
{
CallFlags callFlag;
if (isConstruct)
{
callFlag = CallFlags_New;
}
else
{
callFlag = CallFlags_Value;
}
Arguments outArgs(CallInfo(callFlag, 0), nullptr);
Var stackArgs[STACK_ARGS_ALLOCA_THRESHOLD];
if (nullptr == argArray)
{
outArgs.Info.Count = 1;
outArgs.Values = &thisVar;
}
else
{
bool isArray = JavascriptArray::IsNonES5Array(argArray);
TypeId typeId = JavascriptOperators::GetTypeId(argArray);
bool isNullOrUndefined = typeId <= TypeIds_UndefinedOrNull;
if (!isNullOrUndefined && !JavascriptOperators::IsObject(argArray)) // ES5: throw if Type(argArray) is not Object
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_FunctionArgument_NeedObject, _u("Function.prototype.apply"));
}
int64 len;
JavascriptArray* arr = NULL;
RecyclableObject* dynamicObject = VarTo<RecyclableObject>(argArray);
if (isNullOrUndefined)
{
len = 0;
}
else if (isArray)
{
#if ENABLE_COPYONACCESS_ARRAY
JavascriptLibrary::CheckAndConvertCopyOnAccessNativeIntArray<Var>(argArray);
#endif
arr = VarTo<JavascriptArray>(argArray);
len = arr->GetLength();
}
else
{
Var lenProp = JavascriptOperators::OP_GetLength(dynamicObject, scriptContext);
len = JavascriptConversion::ToLength(lenProp, scriptContext);
}
if (len >= CallInfo::kMaxCountArgs)
{
JavascriptError::ThrowRangeError(scriptContext, JSERR_ArgListTooLarge);
}
outArgs.Info.Count = (uint)len + 1;
if (len == 0)
{
outArgs.Values = &thisVar;
}
else
{
if (outArgs.Info.Count > STACK_ARGS_ALLOCA_THRESHOLD)
{
PROBE_STACK(scriptContext, outArgs.Info.Count * sizeof(Var)+Js::Constants::MinStackDefault); // args + function call
outArgs.Values = (Var*)_alloca(outArgs.Info.Count * sizeof(Var));
}
else
{
outArgs.Values = stackArgs;
}
outArgs.Values[0] = thisVar;
Var undefined = pFunc->GetLibrary()->GetUndefined();
if (isArray && arr->GetScriptContext() == scriptContext)
{
arr->ForEachItemInRange<false>(0, (uint)len, undefined, scriptContext,
[&outArgs](uint index, Var element)
{
outArgs.Values[index + 1] = element;
});
}
else
{
for (uint i = 0; i < len; i++)
{
Var element = nullptr;
if (!JavascriptOperators::GetItem(dynamicObject, i, &element, scriptContext))
{
element = undefined;
}
outArgs.Values[i + 1] = element;
}
}
}
}
if (isConstruct)
{
return JavascriptFunction::CallAsConstructor(pFunc, overridingNewTarget, outArgs, scriptContext);
}
else
{
// Apply scenarios can have more than Constants::MaxAllowedArgs number of args. Need to use the large argCount logic here.
return JavascriptFunction::CallFunction<true>(pFunc, pFunc->GetEntryPoint(), outArgs, /* useLargeArgCount */true);
}
}
Var JavascriptFunction::ApplyHelper(RecyclableObject* function, Var thisArg, Var argArray, ScriptContext* scriptContext)
{
BEGIN_SAFE_REENTRANT_CALL(scriptContext->GetThreadContext())
{
return CalloutHelper<false>(function, thisArg, /* overridingNewTarget = */nullptr, argArray, scriptContext);
}
END_SAFE_REENTRANT_CALL
}
Var JavascriptFunction::ConstructHelper(RecyclableObject* function, Var thisArg, Var overridingNewTarget, Var argArray, ScriptContext* scriptContext)
{
BEGIN_SAFE_REENTRANT_CALL(scriptContext->GetThreadContext())
{
return CalloutHelper<true>(function, thisArg, overridingNewTarget, argArray, scriptContext);
}
END_SAFE_REENTRANT_CALL
}
Var JavascriptFunction::EntryBind(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
ScriptContext* scriptContext = function->GetScriptContext();
CHAKRATEL_LANGSTATS_INC_BUILTINCOUNT(Function_Prototype_bind);
Assert(!(callInfo.Flags & CallFlags_New));
///
/// Check Argument[0] has internal [[Call]] property
/// If not, throw TypeError
///
if (args.Info.Count == 0 || !JavascriptConversion::IsCallable(args[0]))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_This_NeedFunction, _u("Function.prototype.bind"));
}
BoundFunction* boundFunc = BoundFunction::New(scriptContext, args);
return boundFunc;
}
// ES5 15.3.4.4
// Function.prototype.call (thisArg [ , arg1 [ , arg2, ... ] ] )
// When the call method is called on an object func with argument thisArg and optional arguments arg1, arg2 etc, the following steps are taken:
// 1. If IsCallable(func) is false, then throw a TypeError exception.
// 2. Let argList be an empty List.
// 3. If this method was called with more than one argument then in left to right order starting with arg1 append each argument as the last element of argList
// 4. Return the result of calling the [[Call]] internal method of func, providing thisArg as the this value and argList as the list of arguments.
// The length property of the call method is 1.
Var JavascriptFunction::EntryCall(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
RUNTIME_ARGUMENTS(args, callInfo);
ScriptContext* scriptContext = function->GetScriptContext();
Assert(!(callInfo.Flags & CallFlags_New));
///
/// Check Argument[0] has internal [[Call]] property
/// If not, throw TypeError
///
uint argCount = args.Info.Count;
if (argCount == 0 || !JavascriptConversion::IsCallable(args[0]))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_This_NeedFunction, _u("Function.prototype.call"));
}
RecyclableObject *pFunc = VarTo<RecyclableObject>(args[0]);
if (argCount == 1)
{
args.Values[0] = scriptContext->GetLibrary()->GetUndefined();
}
else
{
///
/// Remove function object from the arguments and pass the rest
///
for (uint i = 0; i < args.Info.Count - 1; ++i)
{
args.Values[i] = args.Values[i + 1];
}
args.Info.Count = args.Info.Count - 1;
}
///
/// Call the [[Call]] method on the function object
///
BEGIN_SAFE_REENTRANT_CALL(scriptContext->GetThreadContext())
{
return JavascriptFunction::CallFunction<true>(pFunc, pFunc->GetEntryPoint(), args, true /*useLargeArgCount*/);
}
END_SAFE_REENTRANT_CALL
}
Var JavascriptFunction::CallRootFunctionInScript(JavascriptFunction* func, Arguments args)
{
ScriptContext* scriptContext = func->GetScriptContext();
if (scriptContext->GetThreadContext()->HasPreviousHostScriptContext())
{
ScriptContext* requestContext = scriptContext->GetThreadContext()->
GetPreviousHostScriptContext()->GetScriptContext();
func = VarTo<JavascriptFunction>(CrossSite::MarshalVar(requestContext,
func, scriptContext));
}
return func->CallRootFunction(args, scriptContext, true);
}
Var JavascriptFunction::CallRootFunction(RecyclableObject* obj, Arguments args, ScriptContext * scriptContext, bool inScript)
{
Var ret = nullptr;
#ifdef FAULT_INJECTION
if (Js::Configuration::Global.flags.FaultInjection >= 0)
{
Js::FaultInjection::pfnHandleAV = JavascriptFunction::CallRootEventFilter;
__try
{
ret = JavascriptFunction::CallRootFunctionInternal(obj, args, scriptContext, inScript);
}
__finally
{
Js::FaultInjection::pfnHandleAV = nullptr;
}
//ret should never be null here
Assert(ret);
return ret;
}
#endif
#ifdef DISABLE_SEH
// xplat: JavascriptArrayBuffer::AllocWrapper is disabled on cross-platform
// (IsValidVirtualBufferLength always returns false).
// SEH and ResumeForOutOfBoundsArrayRefs are not needed.
ret = JavascriptFunction::CallRootFunctionInternal(obj, args, scriptContext, inScript);
#else
if (scriptContext->GetThreadContext()->GetAbnormalExceptionCode() != 0)
{
// ensure that hosts are not doing SEH across Chakra frames, as that can lead to bad state (e.g. destructors not being called)
UnexpectedExceptionHandling_fatal_error();
}
// mark volatile, because otherwise VC will incorrectly optimize away load in the finally block
volatile uint32 exceptionCode = 0;
EXCEPTION_POINTERS exceptionInfo = { 0 };
__try
{
__try
{
ret = JavascriptFunction::CallRootFunctionInternal(obj, args, scriptContext, inScript);
}
__except (
exceptionInfo = *GetExceptionInformation(),
exceptionCode = GetExceptionCode(),
CallRootEventFilter(exceptionCode, GetExceptionInformation()))
{
Assert(UNREACHED);
}
}
__finally
{
// 0xE06D7363 is C++ exception code
if (exceptionCode != 0 && exceptionCode != 0xE06D7363 && AbnormalTermination() && !IsDebuggerPresent())
{
scriptContext->GetThreadContext()->SetAbnormalExceptionCode(exceptionCode);
scriptContext->GetThreadContext()->SetAbnormalExceptionRecord(&exceptionInfo);
}
}
#endif
//ret should never be null here
Assert(ret);
return ret;
}
Var JavascriptFunction::CallRootFunctionInternal(RecyclableObject* obj, Arguments args, ScriptContext * scriptContext, bool inScript)
{
#if DBG
if (IsInAssert != 0)
{
// Just don't execute anything if we are in an assert
Js::Throw::FatalInternalError();
}
#endif
if (inScript)
{
Assert(!(args.Info.Flags & CallFlags_New));
BEGIN_SAFE_REENTRANT_CALL(scriptContext->GetThreadContext())
{
return JavascriptFunction::CallFunction<true>(obj, obj->GetEntryPoint(), args);
}
END_SAFE_REENTRANT_CALL
}
#ifdef ENABLE_DEBUG_CONFIG_OPTIONS
Js::Var varThis;
if (PHASE_FORCE1(Js::EvalCompilePhase) && args.Info.Count == 0)
{
varThis = JavascriptOperators::OP_GetThis(scriptContext->GetLibrary()->GetUndefined(), kmodGlobal, scriptContext);
args.Info.Flags = (Js::CallFlags)(args.Info.Flags | CallFlags_Eval);
args.Info.Count = 1;
args.Values = &varThis;
}
#endif
Var varResult = nullptr;
ThreadContext *threadContext;
threadContext = scriptContext->GetThreadContext();
JavascriptExceptionObject* pExceptionObject = NULL;
bool hasCaller = scriptContext->GetHostScriptContext() ? !!scriptContext->GetHostScriptContext()->HasCaller() : false;
Assert(scriptContext == obj->GetScriptContext());
BEGIN_JS_RUNTIME_CALLROOT_EX(scriptContext, hasCaller)
{
scriptContext->VerifyAlive(true);
try
{
BEGIN_SAFE_REENTRANT_CALL(scriptContext->GetThreadContext())
{
varResult = args.Info.Flags & CallFlags_New ?
JavascriptFunction::CallAsConstructor(obj, /* overridingNewTarget = */nullptr, args, scriptContext) :
JavascriptFunction::CallFunction<true>(obj, obj->GetEntryPoint(), args);
}
END_SAFE_REENTRANT_CALL
// A recent compiler bug 150148 can incorrectly eliminate catch block, temporary workaround
if (threadContext == NULL)
{
throw JavascriptException(nullptr);
}
}
catch (const JavascriptException& err)
{
pExceptionObject = err.GetAndClear();
}
if (pExceptionObject)
{
JavascriptExceptionOperators::DoThrowCheckClone(pExceptionObject, scriptContext);
}
}
END_JS_RUNTIME_CALL(scriptContext);
Assert(varResult != nullptr);
return varResult;
}
Var JavascriptFunction::CallRootFunction(Arguments args, ScriptContext * scriptContext, bool inScript)
{
return JavascriptFunction::CallRootFunction(this, args, scriptContext, inScript);
}
#if DBG
/*static*/
void JavascriptFunction::CheckValidDebugThunk(ScriptContext* scriptContext, RecyclableObject *function)
{
Assert(scriptContext != nullptr);
Assert(function != nullptr);
if (scriptContext->IsScriptContextInDebugMode()
&& !scriptContext->IsInterpreted() && !CONFIG_FLAG(ForceDiagnosticsMode) // Does not work nicely if we change the default settings.
&& function->GetEntryPoint() != scriptContext->CurrentThunk
&& !CrossSite::IsThunk(function->GetEntryPoint())
&& VarIs<JavascriptFunction>(function))
{
JavascriptFunction *jsFunction = VarTo<JavascriptFunction>(function);
if (!jsFunction->IsBoundFunction()
&& !jsFunction->GetFunctionInfo()->IsDeferred()
&& (jsFunction->GetFunctionInfo()->GetAttributes() & FunctionInfo::DoNotProfile) != FunctionInfo::DoNotProfile
&& jsFunction->GetFunctionInfo() != &JavascriptExternalFunction::EntryInfo::WrappedFunctionThunk)
{
Js::FunctionProxy *proxy = jsFunction->GetFunctionProxy();
if (proxy)
{
AssertMsg(proxy->HasValidEntryPoint(), "Function does not have valid entrypoint");
}
}
}
}
#endif
Var JavascriptFunction::CallAsConstructor(Var v, Var overridingNewTarget, Arguments args, ScriptContext* scriptContext, const Js::AuxArray<uint32> *spreadIndices)
{
Assert(v);
Assert(args.Info.Flags & CallFlags_New);
Assert(scriptContext);
// newCount is ushort.
if (args.Info.Count >= USHORT_MAX)
{
JavascriptError::ThrowRangeError(scriptContext, JSERR_ArgListTooLarge);
}
AnalysisAssert(args.Info.Count < USHORT_MAX);
// Create the empty object if necessary:
// - Built-in constructor functions will return a new object of a specific type, so a new empty object does not need to
// be created
// - If the newTarget is specified and the function is base kind then the this object will be already created. So we can
// just use it instead of creating a new one.
// - For user-defined constructor functions, an empty object is created with the function's prototype
Var resultObject = nullptr;
if (overridingNewTarget != nullptr && args.Info.Count > 0)
{
resultObject = args.Values[0];
}
else
{
BEGIN_SAFE_REENTRANT_CALL(scriptContext->GetThreadContext())
{
resultObject = JavascriptOperators::NewScObjectNoCtor(v, scriptContext);
}
END_SAFE_REENTRANT_CALL
}
// JavascriptOperators::NewScObjectNoCtor should have thrown if 'v' is not a constructor
RecyclableObject* functionObj = UnsafeVarTo<RecyclableObject>(v);
const unsigned STACK_ARGS_ALLOCA_THRESHOLD = 8; // Number of stack args we allow before using _alloca
Var stackArgs[STACK_ARGS_ALLOCA_THRESHOLD];
Var* newValues = args.Values;
CallFlags newFlags = args.Info.Flags;
bool thisAlreadySpecified = false;
if (overridingNewTarget != nullptr)
{
ScriptFunction * scriptFunctionObj = JavascriptOperators::TryFromVar<ScriptFunction>(functionObj);
uint newCount = args.Info.Count;
if (scriptFunctionObj && scriptFunctionObj->GetFunctionInfo()->IsClassConstructor())
{
thisAlreadySpecified = true;
args.Values[0] = overridingNewTarget;
}
else
{
newCount++;
newFlags = (CallFlags)(newFlags | CallFlags_NewTarget | CallFlags_ExtraArg);
if (newCount > STACK_ARGS_ALLOCA_THRESHOLD)
{
PROBE_STACK(scriptContext, newCount * sizeof(Var) + Js::Constants::MinStackDefault); // args + function call
newValues = (Var*)_alloca(newCount * sizeof(Var));
}
else
{
newValues = stackArgs;
}
for (unsigned int i = 0; i < args.Info.Count; i++)
{
newValues[i] = args.Values[i];
}
#pragma prefast(suppress:6386, "The index is within the bounds")
newValues[args.Info.Count] = overridingNewTarget;
}
}
// Call the constructor function:
// - If this is not already specified as the overriding new target in Reflect.construct a class case, then
// - Pass in the new empty object as the 'this' parameter. This can be null if an empty object was not created.
if (!thisAlreadySpecified)
{
newValues[0] = resultObject;
}
CallInfo newCallInfo(newFlags, args.Info.Count);
Arguments newArgs(newCallInfo, newValues);
if (VarIs<JavascriptProxy>(v))
{
JavascriptProxy* proxy = VarTo<JavascriptProxy>(v);
return proxy->ConstructorTrap(newArgs, scriptContext, spreadIndices);
}
#if DBG
if (scriptContext->IsScriptContextInDebugMode())
{
CheckValidDebugThunk(scriptContext, functionObj);
}
#endif
Var functionResult;
if (spreadIndices != nullptr)
{
functionResult = CallSpreadFunction(functionObj, newArgs, spreadIndices);
}
else
{
functionResult = CallFunction<true>(functionObj, functionObj->GetEntryPoint(), newArgs, true /*useLargeArgCount*/);
}
return
FinishConstructor(
functionResult,
resultObject,
VarIs<JavascriptFunction>(functionObj) && functionObj->GetScriptContext() == scriptContext ?
VarTo<JavascriptFunction>(functionObj) :
nullptr,
overridingNewTarget != nullptr);
}
Var JavascriptFunction::FinishConstructor(
const Var constructorReturnValue,
Var newObject,
JavascriptFunction *const function,
bool hasOverridingNewTarget)
{
Assert(constructorReturnValue);
// CONSIDER: Using constructorCache->ctorHasNoExplicitReturnValue to speed up this interpreter code path.
if (JavascriptOperators::IsObject(constructorReturnValue))
{
newObject = constructorReturnValue;
}
// #3217: Cases with overriding newTarget are not what constructor cache is intended for;
// Bypass constructor cache to avoid prototype mismatch/confusion.