src/runtime/runtime-internal.cc

// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/runtime/runtime-utils.h"

#include "src/arguments.h"
#include "src/ast/prettyprinter.h"
#include "src/bootstrapper.h"
#include "src/conversions.h"
#include "src/debug/debug.h"
#include "src/frames-inl.h"
#include "src/isolate-inl.h"
#include "src/messages.h"
#include "src/parsing/parser.h"
#include "src/wasm/wasm-module.h"

namespace v8 {
namespace internal {

RUNTIME_FUNCTION(Runtime_CheckIsBootstrapping) {
  SealHandleScope shs(isolate);
  DCHECK(args.length() == 0);
  CHECK(isolate->bootstrapper()->IsActive());
  return isolate->heap()->undefined_value();
}


RUNTIME_FUNCTION(Runtime_ExportFromRuntime) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 1);
  CONVERT_ARG_HANDLE_CHECKED(JSObject, container, 0);
  CHECK(isolate->bootstrapper()->IsActive());
  JSObject::NormalizeProperties(container, KEEP_INOBJECT_PROPERTIES, 10,
                                "ExportFromRuntime");
  Bootstrapper::ExportFromRuntime(isolate, container);
  JSObject::MigrateSlowToFast(container, 0, "ExportFromRuntime");
  return *container;
}


RUNTIME_FUNCTION(Runtime_ExportExperimentalFromRuntime) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 1);
  CONVERT_ARG_HANDLE_CHECKED(JSObject, container, 0);
  CHECK(isolate->bootstrapper()->IsActive());
  JSObject::NormalizeProperties(container, KEEP_INOBJECT_PROPERTIES, 10,
                                "ExportExperimentalFromRuntime");
  Bootstrapper::ExportExperimentalFromRuntime(isolate, container);
  JSObject::MigrateSlowToFast(container, 0, "ExportExperimentalFromRuntime");
  return *container;
}


RUNTIME_FUNCTION(Runtime_InstallToContext) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 1);
  CONVERT_ARG_HANDLE_CHECKED(JSArray, array, 0);
  CHECK(array->HasFastElements());
  CHECK(isolate->bootstrapper()->IsActive());
  Handle<Context> native_context = isolate->native_context();
  Handle<FixedArray> fixed_array(FixedArray::cast(array->elements()));
  int length = Smi::cast(array->length())->value();
  for (int i = 0; i < length; i += 2) {
    CHECK(fixed_array->get(i)->IsString());
    Handle<String> name(String::cast(fixed_array->get(i)));
    CHECK(fixed_array->get(i + 1)->IsJSObject());
    Handle<JSObject> object(JSObject::cast(fixed_array->get(i + 1)));
    int index = Context::ImportedFieldIndexForName(name);
    if (index == Context::kNotFound) {
      index = Context::IntrinsicIndexForName(name);
    }
    CHECK(index != Context::kNotFound);
    native_context->set(index, *object);
  }
  return isolate->heap()->undefined_value();
}


RUNTIME_FUNCTION(Runtime_Throw) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 1);
  return isolate->Throw(args[0]);
}


RUNTIME_FUNCTION(Runtime_ReThrow) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 1);
  return isolate->ReThrow(args[0]);
}


RUNTIME_FUNCTION(Runtime_ThrowStackOverflow) {
  SealHandleScope shs(isolate);
  DCHECK_LE(0, args.length());
  return isolate->StackOverflow();
}

RUNTIME_FUNCTION(Runtime_ThrowWasmError) {
  HandleScope scope(isolate);
  DCHECK_EQ(2, args.length());
  CONVERT_SMI_ARG_CHECKED(message_id, 0);
  CONVERT_SMI_ARG_CHECKED(byte_offset, 1);
  Handle<Object> error_obj = isolate->factory()->NewError(
      static_cast<MessageTemplate::Template>(message_id));

  // For wasm traps, the byte offset (a.k.a source position) can not be
  // determined from relocation info, since the explicit checks for traps
  // converge in one singe block which calls this runtime function.
  // We hence pass the byte offset explicitely, and patch it into the top-most
  // frame (a wasm frame) on the collected stack trace.
  // TODO(wasm): This implementation is temporary, see bug #5007:
  // https://bugs.chromium.org/p/v8/issues/detail?id=5007
  Handle<JSObject> error = Handle<JSObject>::cast(error_obj);
  Handle<Object> stack_trace_obj = JSReceiver::GetDataProperty(
      error, isolate->factory()->stack_trace_symbol());
  // Patch the stack trace (array of <receiver, function, code, position>).
  if (stack_trace_obj->IsJSArray()) {
    Handle<FixedArray> stack_elements(
        FixedArray::cast(JSArray::cast(*stack_trace_obj)->elements()));
    DCHECK_EQ(1, stack_elements->length() % 4);
    DCHECK(Code::cast(stack_elements->get(3))->kind() == Code::WASM_FUNCTION);
    DCHECK(stack_elements->get(4)->IsSmi() &&
           Smi::cast(stack_elements->get(4))->value() >= 0);
    stack_elements->set(4, Smi::FromInt(-1 - byte_offset));
  }
  Handle<Object> detailed_stack_trace_obj = JSReceiver::GetDataProperty(
      error, isolate->factory()->detailed_stack_trace_symbol());
  // Patch the detailed stack trace (array of JSObjects with various
  // properties).
  if (detailed_stack_trace_obj->IsJSArray()) {
    Handle<FixedArray> stack_elements(
        FixedArray::cast(JSArray::cast(*detailed_stack_trace_obj)->elements()));
    DCHECK_GE(stack_elements->length(), 1);
    Handle<JSObject> top_frame(JSObject::cast(stack_elements->get(0)));
    Handle<String> wasm_offset_key =
        isolate->factory()->InternalizeOneByteString(
            STATIC_CHAR_VECTOR("column"));
    LookupIterator it(top_frame, wasm_offset_key, top_frame,
                      LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR);
    if (it.IsFound()) {
      DCHECK(JSReceiver::GetDataProperty(&it)->IsSmi());
      // Make column number 1-based here.
      Maybe<bool> data_set = JSReceiver::SetDataProperty(
          &it, handle(Smi::FromInt(byte_offset + 1), isolate));
      DCHECK(data_set.IsJust() && data_set.FromJust() == true);
      USE(data_set);
    }
  }

  return isolate->Throw(*error_obj);
}

RUNTIME_FUNCTION(Runtime_UnwindAndFindExceptionHandler) {
  SealHandleScope shs(isolate);
  DCHECK(args.length() == 0);
  return isolate->UnwindAndFindHandler();
}


RUNTIME_FUNCTION(Runtime_PromoteScheduledException) {
  SealHandleScope shs(isolate);
  DCHECK(args.length() == 0);
  return isolate->PromoteScheduledException();
}


RUNTIME_FUNCTION(Runtime_ThrowReferenceError) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 1);
  CONVERT_ARG_HANDLE_CHECKED(Object, name, 0);
  THROW_NEW_ERROR_RETURN_FAILURE(
      isolate, NewReferenceError(MessageTemplate::kNotDefined, name));
}


RUNTIME_FUNCTION(Runtime_NewTypeError) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 2);
  CONVERT_INT32_ARG_CHECKED(template_index, 0);
  CONVERT_ARG_HANDLE_CHECKED(Object, arg0, 1);
  auto message_template =
      static_cast<MessageTemplate::Template>(template_index);
  return *isolate->factory()->NewTypeError(message_template, arg0);
}


RUNTIME_FUNCTION(Runtime_NewReferenceError) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 2);
  CONVERT_INT32_ARG_CHECKED(template_index, 0);
  CONVERT_ARG_HANDLE_CHECKED(Object, arg0, 1);
  auto message_template =
      static_cast<MessageTemplate::Template>(template_index);
  return *isolate->factory()->NewReferenceError(message_template, arg0);
}


RUNTIME_FUNCTION(Runtime_NewSyntaxError) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 2);
  CONVERT_INT32_ARG_CHECKED(template_index, 0);
  CONVERT_ARG_HANDLE_CHECKED(Object, arg0, 1);
  auto message_template =
      static_cast<MessageTemplate::Template>(template_index);
  return *isolate->factory()->NewSyntaxError(message_template, arg0);
}


RUNTIME_FUNCTION(Runtime_ThrowIllegalInvocation) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 0);
  THROW_NEW_ERROR_RETURN_FAILURE(
      isolate, NewTypeError(MessageTemplate::kIllegalInvocation));
}

RUNTIME_FUNCTION(Runtime_ThrowIncompatibleMethodReceiver) {
  HandleScope scope(isolate);
  DCHECK_EQ(2, args.length());
  CONVERT_ARG_HANDLE_CHECKED(Object, arg0, 0);
  CONVERT_ARG_HANDLE_CHECKED(Object, arg1, 1);
  THROW_NEW_ERROR_RETURN_FAILURE(
      isolate,
      NewTypeError(MessageTemplate::kIncompatibleMethodReceiver, arg0, arg1));
}

RUNTIME_FUNCTION(Runtime_ThrowIteratorResultNotAnObject) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 1);
  CONVERT_ARG_HANDLE_CHECKED(Object, value, 0);
  THROW_NEW_ERROR_RETURN_FAILURE(
      isolate,
      NewTypeError(MessageTemplate::kIteratorResultNotAnObject, value));
}

RUNTIME_FUNCTION(Runtime_ThrowGeneratorRunning) {
  HandleScope scope(isolate);
  DCHECK_EQ(0, args.length());
  THROW_NEW_ERROR_RETURN_FAILURE(
      isolate, NewTypeError(MessageTemplate::kGeneratorRunning));
}

RUNTIME_FUNCTION(Runtime_ThrowApplyNonFunction) {
  HandleScope scope(isolate);
  DCHECK_EQ(1, args.length());
  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
  Handle<String> type = Object::TypeOf(isolate, object);
  THROW_NEW_ERROR_RETURN_FAILURE(
      isolate, NewTypeError(MessageTemplate::kApplyNonFunction, object, type));
}


RUNTIME_FUNCTION(Runtime_PromiseRejectEvent) {
  DCHECK(args.length() == 3);
  HandleScope scope(isolate);
  CONVERT_ARG_HANDLE_CHECKED(JSObject, promise, 0);
  CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
  CONVERT_BOOLEAN_ARG_CHECKED(debug_event, 2);
  if (debug_event) isolate->debug()->OnPromiseReject(promise, value);
  Handle<Symbol> key = isolate->factory()->promise_has_handler_symbol();
  // Do not report if we actually have a handler.
  if (JSReceiver::GetDataProperty(promise, key)->IsUndefined(isolate)) {
    isolate->ReportPromiseReject(promise, value,
                                 v8::kPromiseRejectWithNoHandler);
  }
  return isolate->heap()->undefined_value();
}


RUNTIME_FUNCTION(Runtime_PromiseRevokeReject) {
  DCHECK(args.length() == 1);
  HandleScope scope(isolate);
  CONVERT_ARG_HANDLE_CHECKED(JSObject, promise, 0);
  Handle<Symbol> key = isolate->factory()->promise_has_handler_symbol();
  // At this point, no revocation has been issued before
  CHECK(JSReceiver::GetDataProperty(promise, key)->IsUndefined(isolate));
  isolate->ReportPromiseReject(promise, Handle<Object>(),
                               v8::kPromiseHandlerAddedAfterReject);
  return isolate->heap()->undefined_value();
}


RUNTIME_FUNCTION(Runtime_StackGuard) {
  SealHandleScope shs(isolate);
  DCHECK(args.length() == 0);

  // First check if this is a real stack overflow.
  StackLimitCheck check(isolate);
  if (check.JsHasOverflowed()) {
    return isolate->StackOverflow();
  }

  return isolate->stack_guard()->HandleInterrupts();
}


RUNTIME_FUNCTION(Runtime_Interrupt) {
  SealHandleScope shs(isolate);
  DCHECK(args.length() == 0);
  return isolate->stack_guard()->HandleInterrupts();
}


RUNTIME_FUNCTION(Runtime_AllocateInNewSpace) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 1);
  CONVERT_SMI_ARG_CHECKED(size, 0);
  CHECK(IsAligned(size, kPointerSize));
  CHECK(size > 0);
  CHECK(size <= Page::kMaxRegularHeapObjectSize);
  return *isolate->factory()->NewFillerObject(size, false, NEW_SPACE);
}


RUNTIME_FUNCTION(Runtime_AllocateInTargetSpace) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 2);
  CONVERT_SMI_ARG_CHECKED(size, 0);
  CONVERT_SMI_ARG_CHECKED(flags, 1);
  CHECK(IsAligned(size, kPointerSize));
  CHECK(size > 0);
  CHECK(size <= Page::kMaxRegularHeapObjectSize);
  bool double_align = AllocateDoubleAlignFlag::decode(flags);
  AllocationSpace space = AllocateTargetSpace::decode(flags);
  return *isolate->factory()->NewFillerObject(size, double_align, space);
}

RUNTIME_FUNCTION(Runtime_AllocateSeqOneByteString) {
  HandleScope scope(isolate);
  DCHECK_EQ(1, args.length());
  CONVERT_SMI_ARG_CHECKED(length, 0);
  Handle<SeqOneByteString> result;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
      isolate, result, isolate->factory()->NewRawOneByteString(length));
  return *result;
}

RUNTIME_FUNCTION(Runtime_AllocateSeqTwoByteString) {
  HandleScope scope(isolate);
  DCHECK_EQ(1, args.length());
  CONVERT_SMI_ARG_CHECKED(length, 0);
  Handle<SeqTwoByteString> result;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
      isolate, result, isolate->factory()->NewRawTwoByteString(length));
  return *result;
}

// Collect the raw data for a stack trace.  Returns an array of 4
// element segments each containing a receiver, function, code and
// native code offset.
RUNTIME_FUNCTION(Runtime_CollectStackTrace) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 2);
  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, error_object, 0);
  CONVERT_ARG_HANDLE_CHECKED(Object, caller, 1);

  if (!isolate->bootstrapper()->IsActive()) {
    // Optionally capture a more detailed stack trace for the message.
    RETURN_FAILURE_ON_EXCEPTION(
        isolate, isolate->CaptureAndSetDetailedStackTrace(error_object));
    // Capture a simple stack trace for the stack property.
    RETURN_FAILURE_ON_EXCEPTION(
        isolate, isolate->CaptureAndSetSimpleStackTrace(error_object, caller));
  }
  return isolate->heap()->undefined_value();
}


RUNTIME_FUNCTION(Runtime_MessageGetStartPosition) {
  SealHandleScope shs(isolate);
  DCHECK(args.length() == 1);
  CONVERT_ARG_CHECKED(JSMessageObject, message, 0);
  return Smi::FromInt(message->start_position());
}


RUNTIME_FUNCTION(Runtime_MessageGetScript) {
  SealHandleScope shs(isolate);
  DCHECK(args.length() == 1);
  CONVERT_ARG_CHECKED(JSMessageObject, message, 0);
  return message->script();
}


RUNTIME_FUNCTION(Runtime_FormatMessageString) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 4);
  CONVERT_INT32_ARG_CHECKED(template_index, 0);
  CONVERT_ARG_HANDLE_CHECKED(String, arg0, 1);
  CONVERT_ARG_HANDLE_CHECKED(String, arg1, 2);
  CONVERT_ARG_HANDLE_CHECKED(String, arg2, 3);
  isolate->native_context()->IncrementErrorsThrown();
  RETURN_RESULT_OR_FAILURE(isolate, MessageTemplate::FormatMessage(
                                        template_index, arg0, arg1, arg2));
}

#define CALLSITE_GET(NAME, RETURN)                          \
  RUNTIME_FUNCTION(Runtime_CallSite##NAME##RT) {            \
    HandleScope scope(isolate);                             \
    DCHECK(args.length() == 1);                             \
    CONVERT_ARG_HANDLE_CHECKED(JSObject, call_site_obj, 0); \
    Handle<String> result;                                  \
    CallSite call_site(isolate, call_site_obj);             \
    CHECK(call_site.IsJavaScript() || call_site.IsWasm());  \
    return RETURN(call_site.NAME(), isolate);               \
  }

static inline Object* ReturnDereferencedHandle(Handle<Object> obj,
                                               Isolate* isolate) {
  return *obj;
}


static inline Object* ReturnPositiveNumberOrNull(int value, Isolate* isolate) {
  if (value >= 0) return *isolate->factory()->NewNumberFromInt(value);
  return isolate->heap()->null_value();
}


static inline Object* ReturnBoolean(bool value, Isolate* isolate) {
  return isolate->heap()->ToBoolean(value);
}


CALLSITE_GET(GetFileName, ReturnDereferencedHandle)
CALLSITE_GET(GetFunctionName, ReturnDereferencedHandle)
CALLSITE_GET(GetScriptNameOrSourceUrl, ReturnDereferencedHandle)
CALLSITE_GET(GetMethodName, ReturnDereferencedHandle)
CALLSITE_GET(GetLineNumber, ReturnPositiveNumberOrNull)
CALLSITE_GET(GetColumnNumber, ReturnPositiveNumberOrNull)
CALLSITE_GET(IsNative, ReturnBoolean)
CALLSITE_GET(IsToplevel, ReturnBoolean)
CALLSITE_GET(IsEval, ReturnBoolean)
CALLSITE_GET(IsConstructor, ReturnBoolean)

#undef CALLSITE_GET


RUNTIME_FUNCTION(Runtime_IS_VAR) {
  UNREACHABLE();  // implemented as macro in the parser
  return NULL;
}


namespace {

bool ComputeLocation(Isolate* isolate, MessageLocation* target) {
  JavaScriptFrameIterator it(isolate);
  if (!it.done()) {
    JavaScriptFrame* frame = it.frame();
    JSFunction* fun = frame->function();
    Object* script = fun->shared()->script();
    if (script->IsScript() &&
        !(Script::cast(script)->source()->IsUndefined(isolate))) {
      Handle<Script> casted_script(Script::cast(script), isolate);
      // Compute the location from the function and the relocation info of the
      // baseline code. For optimized code this will use the deoptimization
      // information to get canonical location information.
      List<FrameSummary> frames(FLAG_max_inlining_levels + 1);
      it.frame()->Summarize(&frames);
      FrameSummary& summary = frames.last();
      int pos = summary.abstract_code()->SourcePosition(summary.code_offset());
      *target = MessageLocation(casted_script, pos, pos + 1, handle(fun));
      return true;
    }
  }
  return false;
}


Handle<String> RenderCallSite(Isolate* isolate, Handle<Object> object) {
  MessageLocation location;
  if (ComputeLocation(isolate, &location)) {
    Zone zone(isolate->allocator());
    base::SmartPointer<ParseInfo> info(
        location.function()->shared()->is_function()
            ? new ParseInfo(&zone, location.function())
            : new ParseInfo(&zone, location.script()));
    if (Parser::ParseStatic(info.get())) {
      CallPrinter printer(isolate, location.function()->shared()->IsBuiltin());
      const char* string = printer.Print(info->literal(), location.start_pos());
      if (strlen(string) > 0) {
        return isolate->factory()->NewStringFromAsciiChecked(string);
      }
    } else {
      isolate->clear_pending_exception();
    }
  }
  return Object::TypeOf(isolate, object);
}

}  // namespace


RUNTIME_FUNCTION(Runtime_ThrowCalledNonCallable) {
  HandleScope scope(isolate);
  DCHECK_EQ(1, args.length());
  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
  Handle<String> callsite = RenderCallSite(isolate, object);
  THROW_NEW_ERROR_RETURN_FAILURE(
      isolate, NewTypeError(MessageTemplate::kCalledNonCallable, callsite));
}

RUNTIME_FUNCTION(Runtime_ThrowCalledOnNullOrUndefined) {
  HandleScope scope(isolate);
  DCHECK_EQ(1, args.length());
  CONVERT_ARG_HANDLE_CHECKED(String, name, 0);
  THROW_NEW_ERROR_RETURN_FAILURE(
      isolate, NewTypeError(MessageTemplate::kCalledOnNullOrUndefined, name));
}

RUNTIME_FUNCTION(Runtime_ThrowConstructedNonConstructable) {
  HandleScope scope(isolate);
  DCHECK_EQ(1, args.length());
  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
  Handle<String> callsite = RenderCallSite(isolate, object);
  THROW_NEW_ERROR_RETURN_FAILURE(
      isolate, NewTypeError(MessageTemplate::kNotConstructor, callsite));
}


RUNTIME_FUNCTION(Runtime_ThrowDerivedConstructorReturnedNonObject) {
  HandleScope scope(isolate);
  DCHECK_EQ(0, args.length());
  THROW_NEW_ERROR_RETURN_FAILURE(
      isolate, NewTypeError(MessageTemplate::kDerivedConstructorReturn));
}


// ES6 section 7.3.17 CreateListFromArrayLike (obj)
RUNTIME_FUNCTION(Runtime_CreateListFromArrayLike) {
  HandleScope scope(isolate);
  DCHECK_EQ(1, args.length());
  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
  RETURN_RESULT_OR_FAILURE(isolate, Object::CreateListFromArrayLike(
                                        isolate, object, ElementTypes::kAll));
}


RUNTIME_FUNCTION(Runtime_IncrementUseCounter) {
  HandleScope scope(isolate);
  DCHECK_EQ(1, args.length());
  CONVERT_SMI_ARG_CHECKED(counter, 0);
  isolate->CountUsage(static_cast<v8::Isolate::UseCounterFeature>(counter));
  return isolate->heap()->undefined_value();
}

RUNTIME_FUNCTION(Runtime_GetAndResetRuntimeCallStats) {
  HandleScope scope(isolate);
  if (args.length() == 0) {
    // Without arguments, the result is returned as a string.
    DCHECK_EQ(0, args.length());
    std::stringstream stats_stream;
    isolate->counters()->runtime_call_stats()->Print(stats_stream);
    Handle<String> result = isolate->factory()->NewStringFromAsciiChecked(
        stats_stream.str().c_str());
    isolate->counters()->runtime_call_stats()->Reset();
    return *result;
  } else {
    DCHECK_LE(args.length(), 2);
    std::FILE* f;
    if (args[0]->IsString()) {
      // With a string argument, the results are appended to that file.
      CONVERT_ARG_HANDLE_CHECKED(String, arg0, 0);
      String::FlatContent flat = arg0->GetFlatContent();
      const char* filename =
          reinterpret_cast<const char*>(&(flat.ToOneByteVector()[0]));
      f = std::fopen(filename, "a");
      DCHECK_NOT_NULL(f);
    } else {
      // With an integer argument, the results are written to stdout/stderr.
      CONVERT_SMI_ARG_CHECKED(fd, 0);
      DCHECK(fd == 1 || fd == 2);
      f = fd == 1 ? stdout : stderr;
    }
    // The second argument (if any) is a message header to be printed.
    if (args.length() >= 2) {
      CONVERT_ARG_HANDLE_CHECKED(String, arg1, 1);
      arg1->PrintOn(f);
      std::fputc('\n', f);
      std::fflush(f);
    }
    OFStream stats_stream(f);
    isolate->counters()->runtime_call_stats()->Print(stats_stream);
    isolate->counters()->runtime_call_stats()->Reset();
    if (args[0]->IsString())
      std::fclose(f);
    else
      std::fflush(f);
    return isolate->heap()->undefined_value();
  }
}

RUNTIME_FUNCTION(Runtime_EnqueueMicrotask) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 1);
  CONVERT_ARG_HANDLE_CHECKED(JSFunction, microtask, 0);
  isolate->EnqueueMicrotask(microtask);
  return isolate->heap()->undefined_value();
}

RUNTIME_FUNCTION(Runtime_RunMicrotasks) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 0);
  isolate->RunMicrotasks();
  return isolate->heap()->undefined_value();
}

RUNTIME_FUNCTION(Runtime_OrdinaryHasInstance) {
  HandleScope scope(isolate);
  DCHECK_EQ(2, args.length());
  CONVERT_ARG_HANDLE_CHECKED(Object, callable, 0);
  CONVERT_ARG_HANDLE_CHECKED(Object, object, 1);
  RETURN_RESULT_OR_FAILURE(
      isolate, Object::OrdinaryHasInstance(isolate, callable, object));
}

RUNTIME_FUNCTION(Runtime_IsWasmObject) {
  HandleScope scope(isolate);
  DCHECK_EQ(1, args.length());
  CONVERT_ARG_CHECKED(Object, object, 0);
  bool is_wasm_object =
      object->IsJSObject() && wasm::IsWasmObject(JSObject::cast(object));
  return *isolate->factory()->ToBoolean(is_wasm_object);
}

}  // namespace internal
}  // namespace v8