src/runtime/runtime-function.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/accessors.h"
#include "src/arguments.h"
#include "src/compiler.h"
#include "src/frames-inl.h"
#include "src/isolate-inl.h"
#include "src/messages.h"
#include "src/profiler/cpu-profiler.h"

namespace v8 {
namespace internal {

RUNTIME_FUNCTION(Runtime_FunctionGetName) {
  SealHandleScope shs(isolate);
  DCHECK(args.length() == 1);

  CONVERT_ARG_CHECKED(JSFunction, f, 0);
  return f->shared()->name();
}


RUNTIME_FUNCTION(Runtime_FunctionSetName) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 2);

  CONVERT_ARG_HANDLE_CHECKED(JSFunction, f, 0);
  CONVERT_ARG_HANDLE_CHECKED(String, name, 1);

  name = String::Flatten(name);
  f->shared()->set_name(*name);
  return isolate->heap()->undefined_value();
}


RUNTIME_FUNCTION(Runtime_FunctionRemovePrototype) {
  SealHandleScope shs(isolate);
  DCHECK(args.length() == 1);

  CONVERT_ARG_CHECKED(JSFunction, f, 0);
  RUNTIME_ASSERT(f->RemovePrototype());
  f->shared()->set_construct_stub(
      *isolate->builtins()->ConstructedNonConstructable());

  return isolate->heap()->undefined_value();
}


RUNTIME_FUNCTION(Runtime_FunctionGetScript) {
  HandleScope scope(isolate);
  DCHECK_EQ(1, args.length());
  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, function, 0);

  if (function->IsJSBoundFunction()) return isolate->heap()->undefined_value();
  Handle<Object> script(Handle<JSFunction>::cast(function)->shared()->script(),
                        isolate);
  if (!script->IsScript()) return isolate->heap()->undefined_value();
  return *Script::GetWrapper(Handle<Script>::cast(script));
}


RUNTIME_FUNCTION(Runtime_FunctionGetSourceCode) {
  HandleScope scope(isolate);
  DCHECK_EQ(1, args.length());
  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, function, 0);
  if (function->IsJSBoundFunction()) return isolate->heap()->undefined_value();
  return *Handle<JSFunction>::cast(function)->shared()->GetSourceCode();
}


RUNTIME_FUNCTION(Runtime_FunctionGetScriptSourcePosition) {
  SealHandleScope shs(isolate);
  DCHECK(args.length() == 1);

  CONVERT_ARG_CHECKED(JSFunction, fun, 0);
  int pos = fun->shared()->start_position();
  return Smi::FromInt(pos);
}


RUNTIME_FUNCTION(Runtime_FunctionGetPositionForOffset) {
  SealHandleScope shs(isolate);
  DCHECK(args.length() == 2);

  CONVERT_ARG_CHECKED(Code, code, 0);
  CONVERT_NUMBER_CHECKED(int, offset, Int32, args[1]);

  RUNTIME_ASSERT(0 <= offset && offset < code->Size());

  Address pc = code->address() + offset;
  return Smi::FromInt(code->SourcePosition(pc));
}


RUNTIME_FUNCTION(Runtime_FunctionSetInstanceClassName) {
  SealHandleScope shs(isolate);
  DCHECK(args.length() == 2);

  CONVERT_ARG_CHECKED(JSFunction, fun, 0);
  CONVERT_ARG_CHECKED(String, name, 1);
  fun->shared()->set_instance_class_name(name);
  return isolate->heap()->undefined_value();
}


RUNTIME_FUNCTION(Runtime_FunctionSetLength) {
  SealHandleScope shs(isolate);
  DCHECK(args.length() == 2);

  CONVERT_ARG_CHECKED(JSFunction, fun, 0);
  CONVERT_SMI_ARG_CHECKED(length, 1);
  RUNTIME_ASSERT((length & 0xC0000000) == 0xC0000000 ||
                 (length & 0xC0000000) == 0x0);
  fun->shared()->set_length(length);
  return isolate->heap()->undefined_value();
}


RUNTIME_FUNCTION(Runtime_FunctionSetPrototype) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 2);

  CONVERT_ARG_HANDLE_CHECKED(JSFunction, fun, 0);
  CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
  RUNTIME_ASSERT(fun->IsConstructor());
  RETURN_FAILURE_ON_EXCEPTION(isolate,
                              Accessors::FunctionSetPrototype(fun, value));
  return args[0];  // return TOS
}


RUNTIME_FUNCTION(Runtime_FunctionIsAPIFunction) {
  SealHandleScope shs(isolate);
  DCHECK(args.length() == 1);

  CONVERT_ARG_CHECKED(JSFunction, f, 0);
  return isolate->heap()->ToBoolean(f->shared()->IsApiFunction());
}


RUNTIME_FUNCTION(Runtime_SetCode) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 2);

  CONVERT_ARG_HANDLE_CHECKED(JSFunction, target, 0);
  CONVERT_ARG_HANDLE_CHECKED(JSFunction, source, 1);

  Handle<SharedFunctionInfo> target_shared(target->shared());
  Handle<SharedFunctionInfo> source_shared(source->shared());

  if (!Compiler::Compile(source, KEEP_EXCEPTION)) {
    return isolate->heap()->exception();
  }

  // Mark both, the source and the target, as un-flushable because the
  // shared unoptimized code makes them impossible to enqueue in a list.
  DCHECK(target_shared->code()->gc_metadata() == NULL);
  DCHECK(source_shared->code()->gc_metadata() == NULL);
  target_shared->set_dont_flush(true);
  source_shared->set_dont_flush(true);

  // Set the code, scope info, formal parameter count, and the length
  // of the target shared function info.
  target_shared->ReplaceCode(source_shared->code());
  target_shared->set_scope_info(source_shared->scope_info());
  target_shared->set_length(source_shared->length());
  target_shared->set_feedback_vector(source_shared->feedback_vector());
  target_shared->set_internal_formal_parameter_count(
      source_shared->internal_formal_parameter_count());
  target_shared->set_start_position_and_type(
      source_shared->start_position_and_type());
  target_shared->set_end_position(source_shared->end_position());
  bool was_native = target_shared->native();
  target_shared->set_compiler_hints(source_shared->compiler_hints());
  target_shared->set_opt_count_and_bailout_reason(
      source_shared->opt_count_and_bailout_reason());
  target_shared->set_native(was_native);
  target_shared->set_profiler_ticks(source_shared->profiler_ticks());
  SharedFunctionInfo::SetScript(
      target_shared, Handle<Object>(source_shared->script(), isolate));

  // Set the code of the target function.
  target->ReplaceCode(source_shared->code());
  DCHECK(target->next_function_link()->IsUndefined());

  // Make sure we get a fresh copy of the literal vector to avoid cross
  // context contamination.
  Handle<Context> context(source->context());
  target->set_context(*context);

  int number_of_literals = source->NumberOfLiterals();
  Handle<LiteralsArray> literals =
      LiteralsArray::New(isolate, handle(target_shared->feedback_vector()),
                         number_of_literals, TENURED);
  target->set_literals(*literals);

  if (isolate->logger()->is_logging_code_events() ||
      isolate->cpu_profiler()->is_profiling()) {
    isolate->logger()->LogExistingFunction(source_shared,
                                           Handle<Code>(source_shared->code()));
  }

  return *target;
}


// Set the native flag on the function.
// This is used to decide if we should transform null and undefined
// into the global object when doing call and apply.
RUNTIME_FUNCTION(Runtime_SetNativeFlag) {
  SealHandleScope shs(isolate);
  RUNTIME_ASSERT(args.length() == 1);

  CONVERT_ARG_CHECKED(Object, object, 0);

  if (object->IsJSFunction()) {
    JSFunction* func = JSFunction::cast(object);
    func->shared()->set_native(true);
  }
  return isolate->heap()->undefined_value();
}


RUNTIME_FUNCTION(Runtime_IsConstructor) {
  SealHandleScope shs(isolate);
  DCHECK_EQ(1, args.length());
  CONVERT_ARG_CHECKED(Object, object, 0);
  return isolate->heap()->ToBoolean(object->IsConstructor());
}


RUNTIME_FUNCTION(Runtime_SetForceInlineFlag) {
  SealHandleScope shs(isolate);
  RUNTIME_ASSERT(args.length() == 1);
  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);

  if (object->IsJSFunction()) {
    JSFunction* func = JSFunction::cast(*object);
    func->shared()->set_force_inline(true);
  }
  return isolate->heap()->undefined_value();
}


RUNTIME_FUNCTION(Runtime_Call) {
  HandleScope scope(isolate);
  DCHECK_LE(2, args.length());
  int const argc = args.length() - 2;
  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, target, 0);
  CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 1);
  ScopedVector<Handle<Object>> argv(argc);
  for (int i = 0; i < argc; ++i) {
    argv[i] = args.at<Object>(2 + i);
  }
  Handle<Object> result;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
      isolate, result,
      Execution::Call(isolate, target, receiver, argc, argv.start()));
  return *result;
}


RUNTIME_FUNCTION(Runtime_TailCall) {
  HandleScope scope(isolate);
  DCHECK_LE(2, args.length());
  int const argc = args.length() - 2;
  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, target, 0);
  CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 1);
  ScopedVector<Handle<Object>> argv(argc);
  for (int i = 0; i < argc; ++i) {
    argv[i] = args.at<Object>(2 + i);
  }
  Handle<Object> result;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
      isolate, result,
      Execution::Call(isolate, target, receiver, argc, argv.start()));
  return *result;
}


RUNTIME_FUNCTION(Runtime_Apply) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 5);
  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, fun, 0);
  CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 1);
  CONVERT_ARG_HANDLE_CHECKED(JSObject, arguments, 2);
  CONVERT_INT32_ARG_CHECKED(offset, 3);
  CONVERT_INT32_ARG_CHECKED(argc, 4);
  RUNTIME_ASSERT(offset >= 0);
  // Loose upper bound to allow fuzzing. We'll most likely run out of
  // stack space before hitting this limit.
  static int kMaxArgc = 1000000;
  RUNTIME_ASSERT(argc >= 0 && argc <= kMaxArgc);

  // If there are too many arguments, allocate argv via malloc.
  const int argv_small_size = 10;
  Handle<Object> argv_small_buffer[argv_small_size];
  base::SmartArrayPointer<Handle<Object> > argv_large_buffer;
  Handle<Object>* argv = argv_small_buffer;
  if (argc > argv_small_size) {
    argv = new Handle<Object>[argc];
    if (argv == NULL) return isolate->StackOverflow();
    argv_large_buffer = base::SmartArrayPointer<Handle<Object> >(argv);
  }

  for (int i = 0; i < argc; ++i) {
    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
        isolate, argv[i], Object::GetElement(isolate, arguments, offset + i));
  }

  Handle<Object> result;
  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
      isolate, result, Execution::Call(isolate, fun, receiver, argc, argv));
  return *result;
}


// ES6 section 9.2.1.2, OrdinaryCallBindThis for sloppy callee.
RUNTIME_FUNCTION(Runtime_ConvertReceiver) {
  HandleScope scope(isolate);
  DCHECK(args.length() == 1);
  CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 0);
  if (receiver->IsNull() || receiver->IsUndefined()) {
    return isolate->global_proxy();
  }
  return *Object::ToObject(isolate, receiver).ToHandleChecked();
}


RUNTIME_FUNCTION(Runtime_IsFunction) {
  SealHandleScope shs(isolate);
  DCHECK_EQ(1, args.length());
  CONVERT_ARG_CHECKED(Object, object, 0);
  return isolate->heap()->ToBoolean(object->IsFunction());
}


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


RUNTIME_FUNCTION(Runtime_FunctionToString) {
  HandleScope scope(isolate);
  DCHECK_EQ(1, args.length());
  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, function, 0);
  return function->IsJSBoundFunction()
             ? *JSBoundFunction::ToString(
                   Handle<JSBoundFunction>::cast(function))
             : *JSFunction::ToString(Handle<JSFunction>::cast(function));
}

}  // namespace internal
}  // namespace v8