Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1 | // Copyright 2015 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/runtime/runtime-utils.h" |
| 6 | |
| 7 | #include "src/arguments.h" |
| 8 | #include "src/base/platform/time.h" |
| 9 | #include "src/conversions-inl.h" |
| 10 | #include "src/futex-emulation.h" |
| 11 | #include "src/globals.h" |
| 12 | |
| 13 | // Implement Futex API for SharedArrayBuffers as defined in the |
| 14 | // SharedArrayBuffer draft spec, found here: |
| 15 | // https://github.com/lars-t-hansen/ecmascript_sharedmem |
| 16 | |
| 17 | namespace v8 { |
| 18 | namespace internal { |
| 19 | |
| 20 | RUNTIME_FUNCTION(Runtime_AtomicsFutexWait) { |
| 21 | HandleScope scope(isolate); |
| 22 | DCHECK(args.length() == 4); |
| 23 | CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0); |
| 24 | CONVERT_SIZE_ARG_CHECKED(index, 1); |
| 25 | CONVERT_INT32_ARG_CHECKED(value, 2); |
| 26 | CONVERT_DOUBLE_ARG_CHECKED(timeout, 3); |
| 27 | RUNTIME_ASSERT(sta->GetBuffer()->is_shared()); |
| 28 | RUNTIME_ASSERT(index < NumberToSize(isolate, sta->length())); |
| 29 | RUNTIME_ASSERT(sta->type() == kExternalInt32Array); |
| 30 | RUNTIME_ASSERT(timeout == V8_INFINITY || !std::isnan(timeout)); |
| 31 | |
| 32 | Handle<JSArrayBuffer> array_buffer = sta->GetBuffer(); |
| 33 | size_t addr = (index << 2) + NumberToSize(isolate, sta->byte_offset()); |
| 34 | |
| 35 | return FutexEmulation::Wait(isolate, array_buffer, addr, value, timeout); |
| 36 | } |
| 37 | |
| 38 | |
| 39 | RUNTIME_FUNCTION(Runtime_AtomicsFutexWake) { |
| 40 | HandleScope scope(isolate); |
| 41 | DCHECK(args.length() == 3); |
| 42 | CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0); |
| 43 | CONVERT_SIZE_ARG_CHECKED(index, 1); |
| 44 | CONVERT_INT32_ARG_CHECKED(count, 2); |
| 45 | RUNTIME_ASSERT(sta->GetBuffer()->is_shared()); |
| 46 | RUNTIME_ASSERT(index < NumberToSize(isolate, sta->length())); |
| 47 | RUNTIME_ASSERT(sta->type() == kExternalInt32Array); |
| 48 | |
| 49 | Handle<JSArrayBuffer> array_buffer = sta->GetBuffer(); |
| 50 | size_t addr = (index << 2) + NumberToSize(isolate, sta->byte_offset()); |
| 51 | |
| 52 | return FutexEmulation::Wake(isolate, array_buffer, addr, count); |
| 53 | } |
| 54 | |
| 55 | |
| 56 | RUNTIME_FUNCTION(Runtime_AtomicsFutexWakeOrRequeue) { |
| 57 | HandleScope scope(isolate); |
| 58 | DCHECK(args.length() == 5); |
| 59 | CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0); |
| 60 | CONVERT_SIZE_ARG_CHECKED(index1, 1); |
| 61 | CONVERT_INT32_ARG_CHECKED(count, 2); |
| 62 | CONVERT_INT32_ARG_CHECKED(value, 3); |
| 63 | CONVERT_SIZE_ARG_CHECKED(index2, 4); |
| 64 | RUNTIME_ASSERT(sta->GetBuffer()->is_shared()); |
| 65 | RUNTIME_ASSERT(index1 < NumberToSize(isolate, sta->length())); |
| 66 | RUNTIME_ASSERT(index2 < NumberToSize(isolate, sta->length())); |
| 67 | RUNTIME_ASSERT(sta->type() == kExternalInt32Array); |
| 68 | |
| 69 | Handle<JSArrayBuffer> array_buffer = sta->GetBuffer(); |
| 70 | size_t addr1 = (index1 << 2) + NumberToSize(isolate, sta->byte_offset()); |
| 71 | size_t addr2 = (index2 << 2) + NumberToSize(isolate, sta->byte_offset()); |
| 72 | |
| 73 | return FutexEmulation::WakeOrRequeue(isolate, array_buffer, addr1, count, |
| 74 | value, addr2); |
| 75 | } |
| 76 | |
| 77 | |
| 78 | RUNTIME_FUNCTION(Runtime_AtomicsFutexNumWaitersForTesting) { |
| 79 | HandleScope scope(isolate); |
| 80 | DCHECK(args.length() == 2); |
| 81 | CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0); |
| 82 | CONVERT_SIZE_ARG_CHECKED(index, 1); |
| 83 | RUNTIME_ASSERT(sta->GetBuffer()->is_shared()); |
| 84 | RUNTIME_ASSERT(index < NumberToSize(isolate, sta->length())); |
| 85 | RUNTIME_ASSERT(sta->type() == kExternalInt32Array); |
| 86 | |
| 87 | Handle<JSArrayBuffer> array_buffer = sta->GetBuffer(); |
| 88 | size_t addr = (index << 2) + NumberToSize(isolate, sta->byte_offset()); |
| 89 | |
| 90 | return FutexEmulation::NumWaitersForTesting(isolate, array_buffer, addr); |
| 91 | } |
| 92 | } // namespace internal |
| 93 | } // namespace v8 |