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diff --git a/js/src/jsapi-tests/testAtomicOperations.cpp b/js/src/jsapi-tests/testAtomicOperations.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/Alignment.h"
+#include "mozilla/Assertions.h"
+
+#include "jit/AtomicOperations.h"
+#include "jsapi-tests/tests.h"
+#include "vm/ArrayBufferObject.h"
+#include "vm/SharedMem.h"
+#include "vm/Uint8Clamped.h"
+#include "wasm/WasmJS.h"
+
+using namespace js;
+
+// Machinery to disguise pointer addresses to the C++ compiler -- quite possibly
+// not thread-safe.
+
+extern void setHiddenPointer(void* p);
+extern void* getHiddenPointer();
+
+void* hidePointerValue(void* p) {
+ setHiddenPointer(p);
+ return getHiddenPointer();
+}
+
+//////////////////////////////////////////////////////////////////////
+//
+// Lock-freedom predicates
+
+BEGIN_REUSABLE_TEST(testAtomicLockFree8) {
+ // isLockfree8() must not return true if there are no 8-byte atomics
+
+ CHECK(!jit::AtomicOperations::isLockfree8() ||
+ jit::AtomicOperations::hasAtomic8());
+
+ // We must have lock-free 8-byte atomics on every platform where we support
+ // wasm, but we don't care otherwise.
+
+ CHECK(!wasm::HasSupport(cx) || jit::AtomicOperations::isLockfree8());
+ return true;
+}
+END_TEST(testAtomicLockFree8)
+
+// The JS spec requires specific behavior for all but 1 and 2.
+
+BEGIN_REUSABLE_TEST(testAtomicLockFreeJS) {
+ static_assert(jit::AtomicOperations::isLockfreeJS(1) ==
+ true); // false is allowed by spec but not in SpiderMonkey
+ static_assert(jit::AtomicOperations::isLockfreeJS(2) == true); // ditto
+ static_assert(jit::AtomicOperations::isLockfreeJS(8) == true); // ditto
+ static_assert(jit::AtomicOperations::isLockfreeJS(3) == false); // required
+ static_assert(jit::AtomicOperations::isLockfreeJS(4) == true); // required
+ static_assert(jit::AtomicOperations::isLockfreeJS(5) == false); // required
+ static_assert(jit::AtomicOperations::isLockfreeJS(6) == false); // required
+ static_assert(jit::AtomicOperations::isLockfreeJS(7) == false); // required
+ return true;
+}
+END_TEST(testAtomicLockFreeJS)
+
+//////////////////////////////////////////////////////////////////////
+//
+// Fence
+
+// This only tests that fenceSeqCst is defined and that it doesn't crash if we
+// call it, but it has no return value and its effect is not observable here.
+
+BEGIN_REUSABLE_TEST(testAtomicFence) {
+ jit::AtomicOperations::fenceSeqCst();
+ return true;
+}
+END_TEST(testAtomicFence)
+
+//////////////////////////////////////////////////////////////////////
+//
+// Memory access primitives
+
+// These tests for the atomic load and store primitives ascertain that the
+// primitives are defined and that they load and store the values they should,
+// but not that the primitives are actually atomic wrt to the memory subsystem.
+
+// Memory for testing atomics. This must be aligned to the natural alignment of
+// the type we're testing; for now, use 8-byte alignment for all.
+
+MOZ_ALIGNED_DECL(8, static uint8_t atomicMem[8]);
+MOZ_ALIGNED_DECL(8, static uint8_t atomicMem2[8]);
+
+// T is the primitive type we're testing, and A and B are references to constant
+// bindings holding values of that type.
+//
+// No bytes of A and B should be 0 or FF. A+B and A-B must not overflow.
+
+#define ATOMIC_TESTS(T, A, B) \
+ T* q = (T*)hidePointerValue((void*)atomicMem); \
+ *q = A; \
+ SharedMem<T*> p = \
+ SharedMem<T*>::shared((T*)hidePointerValue((T*)atomicMem)); \
+ CHECK(*q == A); \
+ CHECK(jit::AtomicOperations::loadSeqCst(p) == A); \
+ CHECK(*q == A); \
+ jit::AtomicOperations::storeSeqCst(p, B); \
+ CHECK(*q == B); \
+ CHECK(jit::AtomicOperations::exchangeSeqCst(p, A) == B); \
+ CHECK(*q == A); \
+ CHECK(jit::AtomicOperations::compareExchangeSeqCst(p, (T)0, (T)1) == \
+ A); /*failure*/ \
+ CHECK(*q == A); \
+ CHECK(jit::AtomicOperations::compareExchangeSeqCst(p, A, B) == \
+ A); /*success*/ \
+ CHECK(*q == B); \
+ *q = A; \
+ CHECK(jit::AtomicOperations::fetchAddSeqCst(p, B) == A); \
+ CHECK(*q == A + B); \
+ *q = A; \
+ CHECK(jit::AtomicOperations::fetchSubSeqCst(p, B) == A); \
+ CHECK(*q == A - B); \
+ *q = A; \
+ CHECK(jit::AtomicOperations::fetchAndSeqCst(p, B) == A); \
+ CHECK(*q == (A & B)); \
+ *q = A; \
+ CHECK(jit::AtomicOperations::fetchOrSeqCst(p, B) == A); \
+ CHECK(*q == (A | B)); \
+ *q = A; \
+ CHECK(jit::AtomicOperations::fetchXorSeqCst(p, B) == A); \
+ CHECK(*q == (A ^ B)); \
+ *q = A; \
+ CHECK(jit::AtomicOperations::loadSafeWhenRacy(p) == A); \
+ jit::AtomicOperations::storeSafeWhenRacy(p, B); \
+ CHECK(*q == B); \
+ T* q2 = (T*)hidePointerValue((void*)atomicMem2); \
+ SharedMem<T*> p2 = \
+ SharedMem<T*>::shared((T*)hidePointerValue((void*)atomicMem2)); \
+ *q = A; \
+ *q2 = B; \
+ jit::AtomicOperations::memcpySafeWhenRacy(p2, p, sizeof(T)); \
+ CHECK(*q2 == A); \
+ *q = A; \
+ *q2 = B; \
+ jit::AtomicOperations::memcpySafeWhenRacy(p2, p.unwrap(), sizeof(T)); \
+ CHECK(*q2 == A); \
+ *q = A; \
+ *q2 = B; \
+ jit::AtomicOperations::memcpySafeWhenRacy(p2.unwrap(), p, sizeof(T)); \
+ CHECK(*q2 == A); \
+ *q = A; \
+ *q2 = B; \
+ jit::AtomicOperations::memmoveSafeWhenRacy(p2, p, sizeof(T)); \
+ CHECK(*q2 == A); \
+ *q = A; \
+ *q2 = B; \
+ jit::AtomicOperations::podCopySafeWhenRacy(p2, p, 1); \
+ CHECK(*q2 == A); \
+ *q = A; \
+ *q2 = B; \
+ jit::AtomicOperations::podMoveSafeWhenRacy(p2, p, 1); \
+ CHECK(*q2 == A); \
+ return true
+
+BEGIN_REUSABLE_TEST(testAtomicOperationsU8) {
+ const uint8_t A = 0xab;
+ const uint8_t B = 0x37;
+ ATOMIC_TESTS(uint8_t, A, B);
+}
+END_TEST(testAtomicOperationsU8)
+
+BEGIN_REUSABLE_TEST(testAtomicOperationsI8) {
+ const int8_t A = 0x3b;
+ const int8_t B = 0x27;
+ ATOMIC_TESTS(int8_t, A, B);
+}
+END_TEST(testAtomicOperationsI8)
+
+BEGIN_REUSABLE_TEST(testAtomicOperationsU16) {
+ const uint16_t A = 0xabdc;
+ const uint16_t B = 0x3789;
+ ATOMIC_TESTS(uint16_t, A, B);
+}
+END_TEST(testAtomicOperationsU16)
+
+BEGIN_REUSABLE_TEST(testAtomicOperationsI16) {
+ const int16_t A = 0x3bdc;
+ const int16_t B = 0x2737;
+ ATOMIC_TESTS(int16_t, A, B);
+}
+END_TEST(testAtomicOperationsI16)
+
+BEGIN_REUSABLE_TEST(testAtomicOperationsU32) {
+ const uint32_t A = 0xabdc0588;
+ const uint32_t B = 0x37891942;
+ ATOMIC_TESTS(uint32_t, A, B);
+}
+END_TEST(testAtomicOperationsU32)
+
+BEGIN_REUSABLE_TEST(testAtomicOperationsI32) {
+ const int32_t A = 0x3bdc0588;
+ const int32_t B = 0x27371843;
+ ATOMIC_TESTS(int32_t, A, B);
+}
+END_TEST(testAtomicOperationsI32)
+
+BEGIN_REUSABLE_TEST(testAtomicOperationsU64) {
+ if (!jit::AtomicOperations::hasAtomic8()) {
+ return true;
+ }
+
+ const uint64_t A(0x9aadf00ddeadbeef);
+ const uint64_t B(0x4eedbead1337f001);
+ ATOMIC_TESTS(uint64_t, A, B);
+}
+END_TEST(testAtomicOperationsU64)
+
+BEGIN_REUSABLE_TEST(testAtomicOperationsI64) {
+ if (!jit::AtomicOperations::hasAtomic8()) {
+ return true;
+ }
+
+ const int64_t A(0x2aadf00ddeadbeef);
+ const int64_t B(0x4eedbead1337f001);
+ ATOMIC_TESTS(int64_t, A, B);
+}
+END_TEST(testAtomicOperationsI64)
+
+// T is the primitive float type we're testing, and A and B are references to
+// constant bindings holding values of that type.
+//
+// Stay away from 0, NaN, infinities, and denormals.
+
+#define ATOMIC_FLOAT_TESTS(T, A, B) \
+ T* q = (T*)hidePointerValue((void*)atomicMem); \
+ *q = A; \
+ SharedMem<T*> p = \
+ SharedMem<T*>::shared((T*)hidePointerValue((T*)atomicMem)); \
+ CHECK(*q == A); \
+ CHECK(jit::AtomicOperations::loadSafeWhenRacy(p) == A); \
+ jit::AtomicOperations::storeSafeWhenRacy(p, B); \
+ CHECK(*q == B); \
+ T* q2 = (T*)hidePointerValue((void*)atomicMem2); \
+ SharedMem<T*> p2 = \
+ SharedMem<T*>::shared((T*)hidePointerValue((void*)atomicMem2)); \
+ *q = A; \
+ *q2 = B; \
+ jit::AtomicOperations::memcpySafeWhenRacy(p2, p, sizeof(T)); \
+ CHECK(*q2 == A); \
+ *q = A; \
+ *q2 = B; \
+ jit::AtomicOperations::memcpySafeWhenRacy(p2, p.unwrap(), sizeof(T)); \
+ CHECK(*q2 == A); \
+ *q = A; \
+ *q2 = B; \
+ jit::AtomicOperations::memcpySafeWhenRacy(p2.unwrap(), p, sizeof(T)); \
+ CHECK(*q2 == A); \
+ *q = A; \
+ *q2 = B; \
+ jit::AtomicOperations::memmoveSafeWhenRacy(p2, p, sizeof(T)); \
+ CHECK(*q2 == A); \
+ *q = A; \
+ *q2 = B; \
+ jit::AtomicOperations::podCopySafeWhenRacy(p2, p, 1); \
+ CHECK(*q2 == A); \
+ *q = A; \
+ *q2 = B; \
+ jit::AtomicOperations::podMoveSafeWhenRacy(p2, p, 1); \
+ CHECK(*q2 == A); \
+ return true
+
+BEGIN_REUSABLE_TEST(testAtomicOperationsF32) {
+ const float A(123.25);
+ const float B(-987.75);
+ ATOMIC_FLOAT_TESTS(float, A, B);
+}
+END_TEST(testAtomicOperationsF32)
+
+BEGIN_REUSABLE_TEST(testAtomicOperationsF64) {
+ const double A(123.25);
+ const double B(-987.75);
+ ATOMIC_FLOAT_TESTS(double, A, B);
+}
+END_TEST(testAtomicOperationsF64)
+
+#define ATOMIC_CLAMPED_TESTS(T, A, B) \
+ T* q = (T*)hidePointerValue((void*)atomicMem); \
+ *q = A; \
+ SharedMem<T*> p = \
+ SharedMem<T*>::shared((T*)hidePointerValue((T*)atomicMem)); \
+ CHECK(*q == A); \
+ CHECK(jit::AtomicOperations::loadSafeWhenRacy(p) == A); \
+ jit::AtomicOperations::storeSafeWhenRacy(p, B); \
+ CHECK(*q == B); \
+ return true
+
+BEGIN_REUSABLE_TEST(testAtomicOperationsU8Clamped) {
+ const uint8_clamped A(0xab);
+ const uint8_clamped B(0x37);
+ ATOMIC_CLAMPED_TESTS(uint8_clamped, A, B);
+}
+END_TEST(testAtomicOperationsU8Clamped)
+
+#undef ATOMIC_TESTS
+#undef ATOMIC_FLOAT_TESTS
+#undef ATOMIC_CLAMPED_TESTS
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