deps/v8/src/runtime/runtime-function.cc

   1 // Copyright 2014 the V8 project authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "src/v8.h"
   6
   7 #include "src/accessors.h"
   8 #include "src/arguments.h"
   9 #include "src/compiler.h"
  10 #include "src/deoptimizer.h"
  11 #include "src/frames.h"
  12 #include "src/runtime/runtime-utils.h"
  13
  14 namespace v8 {
  15 namespace internal {
  16
  17 RUNTIME_FUNCTION(Runtime_IsSloppyModeFunction) {
  18   SealHandleScope shs(isolate);
  19   DCHECK(args.length() == 1);
  20   CONVERT_ARG_CHECKED(JSReceiver, callable, 0);
  21   if (!callable->IsJSFunction()) {
  22     HandleScope scope(isolate);
  23     Handle<Object> delegate;
  24     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
  25         isolate, delegate, Execution::TryGetFunctionDelegate(
  26                                isolate, Handle<JSReceiver>(callable)));
  27     callable = JSFunction::cast(*delegate);
  28   }
  29   JSFunction* function = JSFunction::cast(callable);
  30   SharedFunctionInfo* shared = function->shared();
  31   return isolate->heap()->ToBoolean(is_sloppy(shared->language_mode()));
  32 }
  33
  34
  35 RUNTIME_FUNCTION(Runtime_GetDefaultReceiver) {
  36   SealHandleScope shs(isolate);
  37   DCHECK(args.length() == 1);
  38   CONVERT_ARG_CHECKED(JSReceiver, callable, 0);
  39
  40   if (!callable->IsJSFunction()) {
  41     HandleScope scope(isolate);
  42     Handle<Object> delegate;
  43     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
  44         isolate, delegate, Execution::TryGetFunctionDelegate(
  45                                isolate, Handle<JSReceiver>(callable)));
  46     callable = JSFunction::cast(*delegate);
  47   }
  48   JSFunction* function = JSFunction::cast(callable);
  49
  50   SharedFunctionInfo* shared = function->shared();
  51   if (shared->native() || is_strict(shared->language_mode())) {
  52     return isolate->heap()->undefined_value();
  53   }
  54   // Returns undefined for strict or native functions, or
  55   // the associated global receiver for "normal" functions.
  56
  57   return function->global_proxy();
  58 }
  59
  60
  61 RUNTIME_FUNCTION(Runtime_FunctionGetName) {
  62   SealHandleScope shs(isolate);
  63   DCHECK(args.length() == 1);
  64
  65   CONVERT_ARG_CHECKED(JSFunction, f, 0);
  66   return f->shared()->name();
  67 }
  68
  69
  70 static Handle<String> NameToFunctionName(Handle<Name> name) {
  71   Handle<String> stringName(name->GetHeap()->empty_string());
  72
  73   // TODO(caitp): Follow proper rules in section 9.2.11 (SetFunctionName)
  74   if (name->IsSymbol()) {
  75     Handle<Object> description(Handle<Symbol>::cast(name)->name(),
  76                                name->GetIsolate());
  77     if (description->IsString()) {
  78       stringName = Handle<String>::cast(description);
  79     }
  80   } else {
  81     stringName = Handle<String>::cast(name);
  82   }
  83
  84   return stringName;
  85 }
  86
  87
  88 RUNTIME_FUNCTION(Runtime_FunctionSetName) {
  89   HandleScope scope(isolate);
  90   DCHECK(args.length() == 2);
  91
  92   CONVERT_ARG_HANDLE_CHECKED(JSFunction, f, 0);
  93   CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
  94
  95   f->shared()->set_name(*NameToFunctionName(name));
  96   return isolate->heap()->undefined_value();
  97 }
  98
  99
 100 RUNTIME_FUNCTION(Runtime_FunctionNameShouldPrintAsAnonymous) {
 101   SealHandleScope shs(isolate);
 102   DCHECK(args.length() == 1);
 103   CONVERT_ARG_CHECKED(JSFunction, f, 0);
 104   return isolate->heap()->ToBoolean(
 105       f->shared()->name_should_print_as_anonymous());
 106 }
 107
 108
 109 RUNTIME_FUNCTION(Runtime_FunctionMarkNameShouldPrintAsAnonymous) {
 110   SealHandleScope shs(isolate);
 111   DCHECK(args.length() == 1);
 112   CONVERT_ARG_CHECKED(JSFunction, f, 0);
 113   f->shared()->set_name_should_print_as_anonymous(true);
 114   return isolate->heap()->undefined_value();
 115 }
 116
 117
 118 RUNTIME_FUNCTION(Runtime_FunctionIsArrow) {
 119   SealHandleScope shs(isolate);
 120   DCHECK(args.length() == 1);
 121   CONVERT_ARG_CHECKED(JSFunction, f, 0);
 122   return isolate->heap()->ToBoolean(f->shared()->is_arrow());
 123 }
 124
 125
 126 RUNTIME_FUNCTION(Runtime_FunctionIsConciseMethod) {
 127   SealHandleScope shs(isolate);
 128   DCHECK(args.length() == 1);
 129   CONVERT_ARG_CHECKED(JSFunction, f, 0);
 130   return isolate->heap()->ToBoolean(f->shared()->is_concise_method());
 131 }
 132
 133
 134 RUNTIME_FUNCTION(Runtime_FunctionRemovePrototype) {
 135   SealHandleScope shs(isolate);
 136   DCHECK(args.length() == 1);
 137
 138   CONVERT_ARG_CHECKED(JSFunction, f, 0);
 139   RUNTIME_ASSERT(f->RemovePrototype());
 140
 141   return isolate->heap()->undefined_value();
 142 }
 143
 144
 145 RUNTIME_FUNCTION(Runtime_FunctionGetScript) {
 146   HandleScope scope(isolate);
 147   DCHECK(args.length() == 1);
 148
 149   CONVERT_ARG_CHECKED(JSFunction, fun, 0);
 150   Handle<Object> script = Handle<Object>(fun->shared()->script(), isolate);
 151   if (!script->IsScript()) return isolate->heap()->undefined_value();
 152
 153   return *Script::GetWrapper(Handle<Script>::cast(script));
 154 }
 155
 156
 157 RUNTIME_FUNCTION(Runtime_FunctionGetSourceCode) {
 158   HandleScope scope(isolate);
 159   DCHECK(args.length() == 1);
 160
 161   CONVERT_ARG_HANDLE_CHECKED(JSFunction, f, 0);
 162   Handle<SharedFunctionInfo> shared(f->shared());
 163   return *shared->GetSourceCode();
 164 }
 165
 166
 167 RUNTIME_FUNCTION(Runtime_FunctionGetScriptSourcePosition) {
 168   SealHandleScope shs(isolate);
 169   DCHECK(args.length() == 1);
 170
 171   CONVERT_ARG_CHECKED(JSFunction, fun, 0);
 172   int pos = fun->shared()->start_position();
 173   return Smi::FromInt(pos);
 174 }
 175
 176
 177 RUNTIME_FUNCTION(Runtime_FunctionGetPositionForOffset) {
 178   SealHandleScope shs(isolate);
 179   DCHECK(args.length() == 2);
 180
 181   CONVERT_ARG_CHECKED(Code, code, 0);
 182   CONVERT_NUMBER_CHECKED(int, offset, Int32, args[1]);
 183
 184   RUNTIME_ASSERT(0 <= offset && offset < code->Size());
 185
 186   Address pc = code->address() + offset;
 187   return Smi::FromInt(code->SourcePosition(pc));
 188 }
 189
 190
 191 RUNTIME_FUNCTION(Runtime_FunctionSetInstanceClassName) {
 192   SealHandleScope shs(isolate);
 193   DCHECK(args.length() == 2);
 194
 195   CONVERT_ARG_CHECKED(JSFunction, fun, 0);
 196   CONVERT_ARG_CHECKED(String, name, 1);
 197   fun->SetInstanceClassName(name);
 198   return isolate->heap()->undefined_value();
 199 }
 200
 201
 202 RUNTIME_FUNCTION(Runtime_FunctionSetLength) {
 203   SealHandleScope shs(isolate);
 204   DCHECK(args.length() == 2);
 205
 206   CONVERT_ARG_CHECKED(JSFunction, fun, 0);
 207   CONVERT_SMI_ARG_CHECKED(length, 1);
 208   RUNTIME_ASSERT((length & 0xC0000000) == 0xC0000000 ||
 209                  (length & 0xC0000000) == 0x0);
 210   fun->shared()->set_length(length);
 211   return isolate->heap()->undefined_value();
 212 }
 213
 214
 215 RUNTIME_FUNCTION(Runtime_FunctionSetPrototype) {
 216   HandleScope scope(isolate);
 217   DCHECK(args.length() == 2);
 218
 219   CONVERT_ARG_HANDLE_CHECKED(JSFunction, fun, 0);
 220   CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
 221   RUNTIME_ASSERT(fun->should_have_prototype());
 222   RETURN_FAILURE_ON_EXCEPTION(isolate,
 223                               Accessors::FunctionSetPrototype(fun, value));
 224   return args[0];  // return TOS
 225 }
 226
 227
 228 RUNTIME_FUNCTION(Runtime_FunctionIsAPIFunction) {
 229   SealHandleScope shs(isolate);
 230   DCHECK(args.length() == 1);
 231
 232   CONVERT_ARG_CHECKED(JSFunction, f, 0);
 233   return isolate->heap()->ToBoolean(f->shared()->IsApiFunction());
 234 }
 235
 236
 237 RUNTIME_FUNCTION(Runtime_FunctionIsBuiltin) {
 238   SealHandleScope shs(isolate);
 239   DCHECK(args.length() == 1);
 240
 241   CONVERT_ARG_CHECKED(JSFunction, f, 0);
 242   return isolate->heap()->ToBoolean(f->IsBuiltin());
 243 }
 244
 245
 246 RUNTIME_FUNCTION(Runtime_SetCode) {
 247   HandleScope scope(isolate);
 248   DCHECK(args.length() == 2);
 249
 250   CONVERT_ARG_HANDLE_CHECKED(JSFunction, target, 0);
 251   CONVERT_ARG_HANDLE_CHECKED(JSFunction, source, 1);
 252
 253   Handle<SharedFunctionInfo> target_shared(target->shared());
 254   Handle<SharedFunctionInfo> source_shared(source->shared());
 255   RUNTIME_ASSERT(!source_shared->bound());
 256
 257   if (!Compiler::EnsureCompiled(source, KEEP_EXCEPTION)) {
 258     return isolate->heap()->exception();
 259   }
 260
 261   // Mark both, the source and the target, as un-flushable because the
 262   // shared unoptimized code makes them impossible to enqueue in a list.
 263   DCHECK(target_shared->code()->gc_metadata() == NULL);
 264   DCHECK(source_shared->code()->gc_metadata() == NULL);
 265   target_shared->set_dont_flush(true);
 266   source_shared->set_dont_flush(true);
 267
 268   // Set the code, scope info, formal parameter count, and the length
 269   // of the target shared function info.
 270   target_shared->ReplaceCode(source_shared->code());
 271   target_shared->set_scope_info(source_shared->scope_info());
 272   target_shared->set_length(source_shared->length());
 273   target_shared->set_feedback_vector(source_shared->feedback_vector());
 274   target_shared->set_internal_formal_parameter_count(
 275       source_shared->internal_formal_parameter_count());
 276   target_shared->set_script(source_shared->script());
 277   target_shared->set_start_position_and_type(
 278       source_shared->start_position_and_type());
 279   target_shared->set_end_position(source_shared->end_position());
 280   bool was_native = target_shared->native();
 281   target_shared->set_compiler_hints(source_shared->compiler_hints());
 282   target_shared->set_opt_count_and_bailout_reason(
 283       source_shared->opt_count_and_bailout_reason());
 284   target_shared->set_native(was_native);
 285   target_shared->set_profiler_ticks(source_shared->profiler_ticks());
 286
 287   // Set the code of the target function.
 288   target->ReplaceCode(source_shared->code());
 289   DCHECK(target->next_function_link()->IsUndefined());
 290
 291   // Make sure we get a fresh copy of the literal vector to avoid cross
 292   // context contamination.
 293   Handle<Context> context(source->context());
 294   int number_of_literals = source->NumberOfLiterals();
 295   Handle<FixedArray> literals =
 296       isolate->factory()->NewFixedArray(number_of_literals, TENURED);
 297   if (number_of_literals > 0) {
 298     literals->set(JSFunction::kLiteralNativeContextIndex,
 299                   context->native_context());
 300   }
 301   target->set_context(*context);
 302   target->set_literals(*literals);
 303
 304   if (isolate->logger()->is_logging_code_events() ||
 305       isolate->cpu_profiler()->is_profiling()) {
 306     isolate->logger()->LogExistingFunction(source_shared,
 307                                            Handle<Code>(source_shared->code()));
 308   }
 309
 310   return *target;
 311 }
 312
 313
 314 // Set the native flag on the function.
 315 // This is used to decide if we should transform null and undefined
 316 // into the global object when doing call and apply.
 317 RUNTIME_FUNCTION(Runtime_SetNativeFlag) {
 318   SealHandleScope shs(isolate);
 319   RUNTIME_ASSERT(args.length() == 1);
 320
 321   CONVERT_ARG_CHECKED(Object, object, 0);
 322
 323   if (object->IsJSFunction()) {
 324     JSFunction* func = JSFunction::cast(object);
 325     func->shared()->set_native(true);
 326   }
 327   return isolate->heap()->undefined_value();
 328 }
 329
 330
 331 RUNTIME_FUNCTION(Runtime_IsConstructor) {
 332   HandleScope handles(isolate);
 333   RUNTIME_ASSERT(args.length() == 1);
 334
 335   CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
 336
 337   // TODO(caitp): implement this in a better/simpler way, allow inlining via TF
 338   if (object->IsJSFunction()) {
 339     Handle<JSFunction> func = Handle<JSFunction>::cast(object);
 340     bool should_have_prototype = func->should_have_prototype();
 341     if (func->shared()->bound()) {
 342       Handle<FixedArray> bound_args =
 343           Handle<FixedArray>(FixedArray::cast(func->function_bindings()));
 344       Handle<Object> bound_function(
 345           JSReceiver::cast(bound_args->get(JSFunction::kBoundFunctionIndex)),
 346           isolate);
 347       if (bound_function->IsJSFunction()) {
 348         Handle<JSFunction> bound = Handle<JSFunction>::cast(bound_function);
 349         DCHECK(!bound->shared()->bound());
 350         should_have_prototype = bound->should_have_prototype();
 351       }
 352     }
 353     return isolate->heap()->ToBoolean(should_have_prototype);
 354   }
 355   return isolate->heap()->false_value();
 356 }
 357
 358
 359 RUNTIME_FUNCTION(Runtime_SetInlineBuiltinFlag) {
 360   SealHandleScope shs(isolate);
 361   RUNTIME_ASSERT(args.length() == 1);
 362   CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
 363
 364   if (object->IsJSFunction()) {
 365     JSFunction* func = JSFunction::cast(*object);
 366     func->shared()->set_inline_builtin(true);
 367   }
 368   return isolate->heap()->undefined_value();
 369 }
 370
 371
 372 // Find the arguments of the JavaScript function invocation that called
 373 // into C++ code. Collect these in a newly allocated array of handles (possibly
 374 // prefixed by a number of empty handles).
 375 static SmartArrayPointer<Handle<Object> > GetCallerArguments(Isolate* isolate,
 376                                                              int prefix_argc,
 377                                                              int* total_argc) {
 378   // Find frame containing arguments passed to the caller.
 379   JavaScriptFrameIterator it(isolate);
 380   JavaScriptFrame* frame = it.frame();
 381   List<JSFunction*> functions(2);
 382   frame->GetFunctions(&functions);
 383   if (functions.length() > 1) {
 384     int inlined_jsframe_index = functions.length() - 1;
 385     JSFunction* inlined_function = functions[inlined_jsframe_index];
 386     SlotRefValueBuilder slot_refs(
 387         frame, inlined_jsframe_index,
 388         inlined_function->shared()->internal_formal_parameter_count());
 389
 390     int args_count = slot_refs.args_length();
 391
 392     *total_argc = prefix_argc + args_count;
 393     SmartArrayPointer<Handle<Object> > param_data(
 394         NewArray<Handle<Object> >(*total_argc));
 395     slot_refs.Prepare(isolate);
 396     for (int i = 0; i < args_count; i++) {
 397       Handle<Object> val = slot_refs.GetNext(isolate, 0);
 398       param_data[prefix_argc + i] = val;
 399     }
 400     slot_refs.Finish(isolate);
 401
 402     return param_data;
 403   } else {
 404     it.AdvanceToArgumentsFrame();
 405     frame = it.frame();
 406     int args_count = frame->ComputeParametersCount();
 407
 408     *total_argc = prefix_argc + args_count;
 409     SmartArrayPointer<Handle<Object> > param_data(
 410         NewArray<Handle<Object> >(*total_argc));
 411     for (int i = 0; i < args_count; i++) {
 412       Handle<Object> val = Handle<Object>(frame->GetParameter(i), isolate);
 413       param_data[prefix_argc + i] = val;
 414     }
 415     return param_data;
 416   }
 417 }
 418
 419
 420 RUNTIME_FUNCTION(Runtime_FunctionBindArguments) {
 421   HandleScope scope(isolate);
 422   DCHECK(args.length() == 4);
 423   CONVERT_ARG_HANDLE_CHECKED(JSFunction, bound_function, 0);
 424   CONVERT_ARG_HANDLE_CHECKED(Object, bindee, 1);
 425   CONVERT_ARG_HANDLE_CHECKED(Object, this_object, 2);
 426   CONVERT_NUMBER_ARG_HANDLE_CHECKED(new_length, 3);
 427
 428   // TODO(lrn): Create bound function in C++ code from premade shared info.
 429   bound_function->shared()->set_bound(true);
 430   // Get all arguments of calling function (Function.prototype.bind).
 431   int argc = 0;
 432   SmartArrayPointer<Handle<Object> > arguments =
 433       GetCallerArguments(isolate, 0, &argc);
 434   // Don't count the this-arg.
 435   if (argc > 0) {
 436     RUNTIME_ASSERT(arguments[0].is_identical_to(this_object));
 437     argc--;
 438   } else {
 439     RUNTIME_ASSERT(this_object->IsUndefined());
 440   }
 441   // Initialize array of bindings (function, this, and any existing arguments
 442   // if the function was already bound).
 443   Handle<FixedArray> new_bindings;
 444   int i;
 445   if (bindee->IsJSFunction() && JSFunction::cast(*bindee)->shared()->bound()) {
 446     Handle<FixedArray> old_bindings(
 447         JSFunction::cast(*bindee)->function_bindings());
 448     RUNTIME_ASSERT(old_bindings->length() > JSFunction::kBoundFunctionIndex);
 449     new_bindings =
 450         isolate->factory()->NewFixedArray(old_bindings->length() + argc);
 451     bindee = Handle<Object>(old_bindings->get(JSFunction::kBoundFunctionIndex),
 452                             isolate);
 453     i = 0;
 454     for (int n = old_bindings->length(); i < n; i++) {
 455       new_bindings->set(i, old_bindings->get(i));
 456     }
 457   } else {
 458     int array_size = JSFunction::kBoundArgumentsStartIndex + argc;
 459     new_bindings = isolate->factory()->NewFixedArray(array_size);
 460     new_bindings->set(JSFunction::kBoundFunctionIndex, *bindee);
 461     new_bindings->set(JSFunction::kBoundThisIndex, *this_object);
 462     i = 2;
 463   }
 464   // Copy arguments, skipping the first which is "this_arg".
 465   for (int j = 0; j < argc; j++, i++) {
 466     new_bindings->set(i, *arguments[j + 1]);
 467   }
 468   new_bindings->set_map_no_write_barrier(isolate->heap()->fixed_array_map());
 469   bound_function->set_function_bindings(*new_bindings);
 470
 471   // Update length. Have to remove the prototype first so that map migration
 472   // is happy about the number of fields.
 473   RUNTIME_ASSERT(bound_function->RemovePrototype());
 474   Handle<Map> bound_function_map(
 475       isolate->native_context()->bound_function_map());
 476   JSObject::MigrateToMap(bound_function, bound_function_map);
 477   Handle<String> length_string = isolate->factory()->length_string();
 478   PropertyAttributes attr =
 479       static_cast<PropertyAttributes>(DONT_DELETE | DONT_ENUM | READ_ONLY);
 480   RETURN_FAILURE_ON_EXCEPTION(
 481       isolate, JSObject::SetOwnPropertyIgnoreAttributes(
 482                    bound_function, length_string, new_length, attr));
 483   return *bound_function;
 484 }
 485
 486
 487 RUNTIME_FUNCTION(Runtime_BoundFunctionGetBindings) {
 488   HandleScope handles(isolate);
 489   DCHECK(args.length() == 1);
 490   CONVERT_ARG_HANDLE_CHECKED(JSReceiver, callable, 0);
 491   if (callable->IsJSFunction()) {
 492     Handle<JSFunction> function = Handle<JSFunction>::cast(callable);
 493     if (function->shared()->bound()) {
 494       RUNTIME_ASSERT(function->function_bindings()->IsFixedArray());
 495       Handle<FixedArray> bindings(function->function_bindings());
 496       return *isolate->factory()->NewJSArrayWithElements(bindings);
 497     }
 498   }
 499   return isolate->heap()->undefined_value();
 500 }
 501
 502
 503 RUNTIME_FUNCTION(Runtime_NewObjectFromBound) {
 504   HandleScope scope(isolate);
 505   DCHECK(args.length() == 1);
 506   // First argument is a function to use as a constructor.
 507   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
 508   RUNTIME_ASSERT(function->shared()->bound());
 509
 510   // The argument is a bound function. Extract its bound arguments
 511   // and callable.
 512   Handle<FixedArray> bound_args =
 513       Handle<FixedArray>(FixedArray::cast(function->function_bindings()));
 514   int bound_argc = bound_args->length() - JSFunction::kBoundArgumentsStartIndex;
 515   Handle<Object> bound_function(
 516       JSReceiver::cast(bound_args->get(JSFunction::kBoundFunctionIndex)),
 517       isolate);
 518   DCHECK(!bound_function->IsJSFunction() ||
 519          !Handle<JSFunction>::cast(bound_function)->shared()->bound());
 520
 521   int total_argc = 0;
 522   SmartArrayPointer<Handle<Object> > param_data =
 523       GetCallerArguments(isolate, bound_argc, &total_argc);
 524   for (int i = 0; i < bound_argc; i++) {
 525     param_data[i] = Handle<Object>(
 526         bound_args->get(JSFunction::kBoundArgumentsStartIndex + i), isolate);
 527   }
 528
 529   if (!bound_function->IsJSFunction()) {
 530     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
 531         isolate, bound_function,
 532         Execution::TryGetConstructorDelegate(isolate, bound_function));
 533   }
 534   DCHECK(bound_function->IsJSFunction());
 535
 536   Handle<Object> result;
 537   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
 538       isolate, result, Execution::New(Handle<JSFunction>::cast(bound_function),
 539                                       total_argc, param_data.get()));
 540   return *result;
 541 }
 542
 543
 544 RUNTIME_FUNCTION(Runtime_Call) {
 545   HandleScope scope(isolate);
 546   DCHECK(args.length() >= 2);
 547   int argc = args.length() - 2;
 548   CONVERT_ARG_CHECKED(JSReceiver, fun, argc + 1);
 549   Object* receiver = args[0];
 550
 551   // If there are too many arguments, allocate argv via malloc.
 552   const int argv_small_size = 10;
 553   Handle<Object> argv_small_buffer[argv_small_size];
 554   SmartArrayPointer<Handle<Object> > argv_large_buffer;
 555   Handle<Object>* argv = argv_small_buffer;
 556   if (argc > argv_small_size) {
 557     argv = new Handle<Object>[argc];
 558     if (argv == NULL) return isolate->StackOverflow();
 559     argv_large_buffer = SmartArrayPointer<Handle<Object> >(argv);
 560   }
 561
 562   for (int i = 0; i < argc; ++i) {
 563     argv[i] = Handle<Object>(args[1 + i], isolate);
 564   }
 565
 566   Handle<JSReceiver> hfun(fun);
 567   Handle<Object> hreceiver(receiver, isolate);
 568   Handle<Object> result;
 569   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
 570       isolate, result,
 571       Execution::Call(isolate, hfun, hreceiver, argc, argv, true));
 572   return *result;
 573 }
 574
 575
 576 RUNTIME_FUNCTION(Runtime_Apply) {
 577   HandleScope scope(isolate);
 578   DCHECK(args.length() == 5);
 579   CONVERT_ARG_HANDLE_CHECKED(JSReceiver, fun, 0);
 580   CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 1);
 581   CONVERT_ARG_HANDLE_CHECKED(JSObject, arguments, 2);
 582   CONVERT_INT32_ARG_CHECKED(offset, 3);
 583   CONVERT_INT32_ARG_CHECKED(argc, 4);
 584   RUNTIME_ASSERT(offset >= 0);
 585   // Loose upper bound to allow fuzzing. We'll most likely run out of
 586   // stack space before hitting this limit.
 587   static int kMaxArgc = 1000000;
 588   RUNTIME_ASSERT(argc >= 0 && argc <= kMaxArgc);
 589
 590   // If there are too many arguments, allocate argv via malloc.
 591   const int argv_small_size = 10;
 592   Handle<Object> argv_small_buffer[argv_small_size];
 593   SmartArrayPointer<Handle<Object> > argv_large_buffer;
 594   Handle<Object>* argv = argv_small_buffer;
 595   if (argc > argv_small_size) {
 596     argv = new Handle<Object>[argc];
 597     if (argv == NULL) return isolate->StackOverflow();
 598     argv_large_buffer = SmartArrayPointer<Handle<Object> >(argv);
 599   }
 600
 601   for (int i = 0; i < argc; ++i) {
 602     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
 603         isolate, argv[i], Object::GetElement(isolate, arguments, offset + i));
 604   }
 605
 606   Handle<Object> result;
 607   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
 608       isolate, result,
 609       Execution::Call(isolate, fun, receiver, argc, argv, true));
 610   return *result;
 611 }
 612
 613
 614 RUNTIME_FUNCTION(Runtime_GetFunctionDelegate) {
 615   HandleScope scope(isolate);
 616   DCHECK(args.length() == 1);
 617   CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
 618   RUNTIME_ASSERT(!object->IsJSFunction());
 619   return *Execution::GetFunctionDelegate(isolate, object);
 620 }
 621
 622
 623 RUNTIME_FUNCTION(Runtime_GetConstructorDelegate) {
 624   HandleScope scope(isolate);
 625   DCHECK(args.length() == 1);
 626   CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
 627   RUNTIME_ASSERT(!object->IsJSFunction());
 628   return *Execution::GetConstructorDelegate(isolate, object);
 629 }
 630
 631
 632 RUNTIME_FUNCTION(RuntimeReference_CallFunction) {
 633   SealHandleScope shs(isolate);
 634   return __RT_impl_Runtime_Call(args, isolate);
 635 }
 636
 637
 638 RUNTIME_FUNCTION(RuntimeReference_IsConstructCall) {
 639   SealHandleScope shs(isolate);
 640   DCHECK(args.length() == 0);
 641   JavaScriptFrameIterator it(isolate);
 642   JavaScriptFrame* frame = it.frame();
 643   return isolate->heap()->ToBoolean(frame->IsConstructor());
 644 }
 645
 646
 647 RUNTIME_FUNCTION(RuntimeReference_IsFunction) {
 648   SealHandleScope shs(isolate);
 649   DCHECK(args.length() == 1);
 650   CONVERT_ARG_CHECKED(Object, obj, 0);
 651   return isolate->heap()->ToBoolean(obj->IsJSFunction());
 652 }
 653 }
 654 }  // namespace v8::internal