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// 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/base/platform/time.h"
#include "src/common/globals.h"
#include "src/execution/arguments-inl.h"
#include "src/execution/futex-emulation.h"
#include "src/logging/counters.h"
#include "src/numbers/conversions-inl.h"
#include "src/objects/heap-object-inl.h"
#include "src/objects/js-array-buffer-inl.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_AtomicsNumWaitersForTesting) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
Handle<JSTypedArray> sta = args.at<JSTypedArray>(0);
size_t index = NumberToSize(args[1]);
CHECK(!sta->WasDetached());
CHECK(sta->GetBuffer()->is_shared());
CHECK_LT(index, sta->length());
CHECK_EQ(sta->type(), kExternalInt32Array);
Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
size_t addr = (index << 2) + sta->byte_offset();
return FutexEmulation::NumWaitersForTesting(array_buffer, addr);
}
RUNTIME_FUNCTION(Runtime_AtomicsNumAsyncWaitersForTesting) {
DCHECK_EQ(0, args.length());
return FutexEmulation::NumAsyncWaitersForTesting(isolate);
}
RUNTIME_FUNCTION(Runtime_AtomicsNumUnresolvedAsyncPromisesForTesting) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
Handle<JSTypedArray> sta = args.at<JSTypedArray>(0);
size_t index = NumberToSize(args[1]);
CHECK(!sta->WasDetached());
CHECK(sta->GetBuffer()->is_shared());
CHECK_LT(index, sta->length());
CHECK_EQ(sta->type(), kExternalInt32Array);
Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
size_t addr = (index << 2) + sta->byte_offset();
return FutexEmulation::NumUnresolvedAsyncPromisesForTesting(array_buffer,
addr);
}
RUNTIME_FUNCTION(Runtime_SetAllowAtomicsWait) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
bool set = Oddball::cast(args[0]).ToBool(isolate);
isolate->set_allow_atomics_wait(set);
return ReadOnlyRoots(isolate).undefined_value();
}
} // namespace internal
} // namespace v8
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