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/*
* Copyright (C) 2016 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 "WasmSignature.h"
#if ENABLE(WEBASSEMBLY)
#include "VM.h"
#include <wtf/FastMalloc.h>
#include <wtf/HashFunctions.h>
#include <wtf/PrintStream.h>
namespace JSC { namespace Wasm {
namespace {
const bool verbose = false;
}
const constexpr SignatureIndex Signature::invalidIndex;
String Signature::toString() const
{
String result(makeString(returnType()));
result.append(" (");
for (SignatureArgCount arg = 0; arg < argumentCount(); ++arg) {
if (arg)
result.append(", ");
result.append(makeString(argument(arg)));
}
result.append(')');
return result;
}
void Signature::dump(PrintStream& out) const
{
out.print(toString());
}
unsigned Signature::hash() const
{
uint32_t sizeToHash = allocatedSize(argumentCount()) / sizeof(allocationSizeRoundsUpTo);
// Assumes over-allocated memory was zero-initialized, and rounded-up to allocationSizeRoundsUpTo so that a wider hash can be performed.
ASSERT(sizeToHash * sizeof(allocationSizeRoundsUpTo) == allocatedSize(argumentCount()));
unsigned accumulator = 0xa1bcedd8u;
const auto* pos = reinterpret_cast<const allocationSizeRoundsUpTo*>(this);
for (uint32_t i = 0; i < sizeToHash; ++i)
accumulator = WTF::pairIntHash(accumulator, WTF::IntHash<allocationSizeRoundsUpTo>::hash(*pos));
return accumulator;
}
Signature* Signature::create(SignatureArgCount argumentCount)
{
// Hashing relies on allocation zero-initializing trailing elements.
auto allocated = tryFastCalloc(allocatedSize(argumentCount), 1);
Signature* signature;
if (!allocated.getValue(signature))
return nullptr;
new (signature) Signature(argumentCount);
return signature;
}
Signature* Signature::createInvalid()
{
Signature* signature = create(0);
RELEASE_ASSERT(signature);
new (signature) Signature(std::numeric_limits<SignatureArgCount>::max());
return signature;
}
void Signature::destroy(Signature* signature)
{
fastFree(signature);
}
SignatureInformation::~SignatureInformation()
{
for (size_t i = 0; i < m_signatures.size(); ++i)
Signature::destroy(m_signatures[i]);
}
SignatureInformation::SignatureInformation()
{
// The zeroth entry is an invalid signature, to match invalidIndex.
ASSERT(!Signature::invalidIndex);
Signature* invalidSignature = Signature::createInvalid();
auto addResult = m_signatureMap.add(SignatureHash { invalidSignature }, Signature::invalidIndex);
RELEASE_ASSERT(addResult.isNewEntry);
ASSERT(Signature::invalidIndex == addResult.iterator->value);
m_signatures.append(invalidSignature);
}
SignatureInformation* SignatureInformation::get(VM* vm)
{
std::call_once(vm->m_wasmSignatureInformationOnceFlag, [vm] {
vm->m_wasmSignatureInformation = std::unique_ptr<SignatureInformation>(new SignatureInformation());
});
return vm->m_wasmSignatureInformation.get();
}
SignatureIndex SignatureInformation::adopt(VM* vm, Signature* signature)
{
SignatureInformation* info = get(vm);
LockHolder lock(info->m_lock);
SignatureIndex nextValue = info->m_signatures.size();
auto addResult = info->m_signatureMap.add(SignatureHash { signature }, nextValue);
if (addResult.isNewEntry) {
ASSERT(nextValue == addResult.iterator->value);
if (verbose)
dataLogLn("Adopt new signature ", *signature, " with index ", addResult.iterator->value, " hash: ", signature->hash());
info->m_signatures.append(signature);
return nextValue;
}
if (verbose)
dataLogLn("Existing signature ", *signature, " with index ", addResult.iterator->value, " hash: ", signature->hash());
Signature::destroy(signature);
ASSERT(addResult.iterator->value != Signature::invalidIndex);
return addResult.iterator->value;
}
const Signature* SignatureInformation::get(VM* vm, SignatureIndex index)
{
ASSERT(index != Signature::invalidIndex);
SignatureInformation* info = get(vm);
LockHolder lock(info->m_lock);
if (verbose)
dataLogLn("Got signature ", *info->m_signatures.at(index), " at index ", index);
return info->m_signatures.at(index);
}
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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