Revert "[SAB] Move Atomics builtins to C++"

src/runtime/runtime-futex.cc

 // Copyright 2015 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/base/platform/time.h"
 #include "src/conversions-inl.h"
 #include "src/futex-emulation.h"
 #include "src/globals.h"
 
 // Implement Futex API for SharedArrayBuffers as defined in the
 // SharedArrayBuffer draft spec, found here:
 // https://github.com/tc39/ecmascript_sharedmem
 
 namespace v8 {
 namespace internal {
 
+RUNTIME_FUNCTION(Runtime_AtomicsWait) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(4, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
+  CONVERT_SIZE_ARG_CHECKED(index, 1);
+  CONVERT_INT32_ARG_CHECKED(value, 2);
+  CONVERT_DOUBLE_ARG_CHECKED(timeout, 3);
+  CHECK(sta->GetBuffer()->is_shared());
+  CHECK_LT(index, NumberToSize(sta->length()));
+  CHECK_EQ(sta->type(), kExternalInt32Array);
+  CHECK(timeout == V8_INFINITY || !std::isnan(timeout));
+
+  if (!isolate->allow_atomics_wait()) {
+    THROW_NEW_ERROR_RETURN_FAILURE(
+        isolate, NewTypeError(MessageTemplate::kAtomicsWaitNotAllowed));
+  }
+
+  Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
+  size_t addr = (index << 2) + NumberToSize(sta->byte_offset());
+
+  return FutexEmulation::Wait(isolate, array_buffer, addr, value, timeout);
+}
+
+RUNTIME_FUNCTION(Runtime_AtomicsWake) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(3, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
+  CONVERT_SIZE_ARG_CHECKED(index, 1);
+  CONVERT_UINT32_ARG_CHECKED(count, 2);
+  CHECK(sta->GetBuffer()->is_shared());
+  CHECK_LT(index, NumberToSize(sta->length()));
+  CHECK_EQ(sta->type(), kExternalInt32Array);
+
+  Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
+  size_t addr = (index << 2) + NumberToSize(sta->byte_offset());
+
+  return FutexEmulation::Wake(isolate, array_buffer, addr, count);
+}
 
 RUNTIME_FUNCTION(Runtime_AtomicsNumWaitersForTesting) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
   CONVERT_SIZE_ARG_CHECKED(index, 1);
   CHECK(sta->GetBuffer()->is_shared());
   CHECK_LT(index, NumberToSize(sta->length()));
   CHECK_EQ(sta->type(), kExternalInt32Array);
 
   Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
   size_t addr = (index << 2) + NumberToSize(sta->byte_offset());
 
   return FutexEmulation::NumWaitersForTesting(isolate, array_buffer, addr);
 }
 
 RUNTIME_FUNCTION(Runtime_SetAllowAtomicsWait) {
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());
   CONVERT_BOOLEAN_ARG_CHECKED(set, 0);
 
   isolate->set_allow_atomics_wait(set);
   return isolate->heap()->undefined_value();
 }
 }  // namespace internal
 }  // namespace v8