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/*
* Copyright (C) 2022 Igalia S.L. All rights reserved.
* Copyright (C) 2023-2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "JSWebAssemblyArray.h"
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
#if ENABLE(WEBASSEMBLY)
#include "JSCInlines.h"
#include "JSWebAssemblyArrayInlines.h"
#include "JSWebAssemblyInstance.h"
#include "TypeError.h"
#include "WasmFormat.h"
#include "WasmTypeDefinition.h"
#include <wtf/StdLibExtras.h>
namespace JSC {
const ClassInfo JSWebAssemblyArray::s_info = { "WebAssembly.Array"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSWebAssemblyArray) };
JSWebAssemblyArray::JSWebAssemblyArray(VM& vm, WebAssemblyGCStructure* structure, unsigned size)
: Base(vm, structure)
, m_size(size)
{
if (elementsAreRefTypes())
std::fill(span<uint64_t>().begin(), span<uint64_t>().end(), JSValue::encode(jsNull()));
else
zeroSpan(bytes());
}
JSWebAssemblyArray* JSWebAssemblyArray::tryCreate(VM& vm, WebAssemblyGCStructure* structure, unsigned size)
{
Wasm::FieldType fieldType = elementType(structure);
std::optional<unsigned> allocationSize = allocationSizeInBytes(fieldType, size);
if (!allocationSize) [[unlikely]]
return nullptr;
auto* array = new (NotNull, allocateCell<JSWebAssemblyArray>(vm, allocationSize.value())) JSWebAssemblyArray(vm, structure, size);
array->finishCreation(vm);
return array;
}
void JSWebAssemblyArray::fill(VM& vm, uint32_t offset, uint64_t value, uint32_t size)
{
// Handle ref types separately to ensure write barriers are in effect.
if (elementsAreRefTypes()) {
// FIXME: We should have a GCSafeMemfill.
for (size_t i = 0; i < size; i++)
set(vm, offset + i, value);
return;
}
visitSpanNonVector([&](auto span) ALWAYS_INLINE_LAMBDA {
span = span.subspan(offset, size);
std::fill(span.begin(), span.end(), value);
});
}
void JSWebAssemblyArray::fill(VM&, uint32_t offset, v128_t value, uint32_t size)
{
ASSERT(elementType().type.unpacked().isV128());
auto payload = span<v128_t>().subspan(offset, size);
std::fill(payload.begin(), payload.end(), value);
}
void JSWebAssemblyArray::copy(VM& vm, JSWebAssemblyArray& dst, uint32_t dstOffset, uint32_t srcOffset, uint32_t size)
{
// Handle ref types separately to ensure write barriers are in effect.
if (elementsAreRefTypes()) {
gcSafeMemmove(dst.span<uint64_t>().subspan(dstOffset).data(), span<uint64_t>().subspan(srcOffset).data(), size * sizeof(JSValue));
vm.writeBarrier(&dst);
return;
}
visitSpan([&]<typename T>(std::span<T> srcSpan) ALWAYS_INLINE_LAMBDA {
srcSpan = srcSpan.subspan(srcOffset, size);
auto dstSpan = dst.span<T>().subspan(dstOffset, size);
memmoveSpan(dstSpan, srcSpan);
});
}
template<typename Visitor>
void JSWebAssemblyArray::visitChildrenImpl(JSCell* cell, Visitor& visitor)
{
JSWebAssemblyArray* thisObject = jsCast<JSWebAssemblyArray*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, visitor);
if (thisObject->elementsAreRefTypes()) {
auto span = thisObject->refTypeSpan();
#if ASSERT_ENABLED
if (!thisObject->m_isUnpopulated) {
for (uint64_t value : span)
validateWasmValue(value, thisObject->elementType().type.unpacked());
}
#endif
visitor.appendValues(std::bit_cast<WriteBarrier<Unknown>*>(span.data()), span.size());
}
}
DEFINE_VISIT_CHILDREN(JSWebAssemblyArray);
} // namespace JSC
#endif // ENABLE(WEBASSEMBLY)
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
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