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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 "WasmMemoryInformation.h"
#if ENABLE(WEBASSEMBLY)
#include "WasmCallingConvention.h"
#include <wtf/NeverDestroyed.h>
namespace JSC { namespace Wasm {
const PinnedRegisterInfo& PinnedRegisterInfo::get()
{
static LazyNeverDestroyed<PinnedRegisterInfo> staticPinnedRegisterInfo;
static std::once_flag staticPinnedRegisterInfoFlag;
std::call_once(staticPinnedRegisterInfoFlag, [] () {
Vector<PinnedSizeRegisterInfo> sizeRegisters;
GPRReg baseMemoryPointer;
// FIXME: We should support more than one memory size register, and we should allow different
// WebAssembly.Instance to have different pins. Right now we take a vector with only one entry.
// If we have more than one size register, we can have one for each load size class.
// see: https://bugs.webkit.org/show_bug.cgi?id=162952
Vector<unsigned> pinnedSizes = { 0 };
unsigned remainingPinnedRegisters = pinnedSizes.size() + 1;
jscCallingConvention().m_calleeSaveRegisters.forEach([&] (Reg reg) {
GPRReg gpr = reg.gpr();
if (!remainingPinnedRegisters || RegisterSet::stackRegisters().get(reg))
return;
if (remainingPinnedRegisters == 1) {
baseMemoryPointer = gpr;
remainingPinnedRegisters--;
} else
sizeRegisters.append({ gpr, pinnedSizes[--remainingPinnedRegisters - 1] });
});
ASSERT(!remainingPinnedRegisters);
staticPinnedRegisterInfo.construct(WTFMove(sizeRegisters), baseMemoryPointer);
});
return staticPinnedRegisterInfo.get();
}
PinnedRegisterInfo::PinnedRegisterInfo(Vector<PinnedSizeRegisterInfo>&& sizeRegisters, GPRReg baseMemoryPointer)
: sizeRegisters(WTFMove(sizeRegisters))
, baseMemoryPointer(baseMemoryPointer)
{
}
MemoryInformation::MemoryInformation(PageCount initial, PageCount maximum, bool isImport)
: m_initial(initial)
, m_maximum(maximum)
, m_isImport(isImport)
{
RELEASE_ASSERT(!!m_initial);
RELEASE_ASSERT(!m_maximum || m_maximum >= m_initial);
ASSERT(!!*this);
}
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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