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/*
* Copyright (C) 2016-2017 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 "WasmContextInlines.h"
#include "WasmMemory.h"
#include <wtf/NeverDestroyed.h>
namespace JSC { namespace Wasm {
static Vector<GPRReg> getPinnedRegisters(unsigned remainingPinnedRegisters)
{
Vector<GPRReg> registers;
jsCallingConvention().calleeSaveRegisters.forEach([&] (Reg reg) {
if (!reg.isGPR())
return;
GPRReg gpr = reg.gpr();
if (!remainingPinnedRegisters || RegisterSet::stackRegisters().get(reg))
return;
if (RegisterSet::runtimeTagRegisters().get(reg)) {
// Since we don't need to, we currently don't pick from the tag registers to allow
// JS->Wasm stubs to freely use these registers.
return;
}
--remainingPinnedRegisters;
registers.append(gpr);
});
return registers;
}
const PinnedRegisterInfo& PinnedRegisterInfo::get()
{
static LazyNeverDestroyed<PinnedRegisterInfo> staticPinnedRegisterInfo;
static std::once_flag staticPinnedRegisterInfoFlag;
std::call_once(staticPinnedRegisterInfoFlag, [] () {
unsigned numberOfPinnedRegisters = 2;
if (!Context::useFastTLS())
++numberOfPinnedRegisters;
Vector<GPRReg> pinnedRegs = getPinnedRegisters(numberOfPinnedRegisters);
GPRReg baseMemoryPointer = pinnedRegs.takeLast();
GPRReg sizeRegister = pinnedRegs.takeLast();
GPRReg wasmContextInstancePointer = InvalidGPRReg;
if (!Context::useFastTLS())
wasmContextInstancePointer = pinnedRegs.takeLast();
staticPinnedRegisterInfo.construct(sizeRegister, baseMemoryPointer, wasmContextInstancePointer);
});
return staticPinnedRegisterInfo.get();
}
PinnedRegisterInfo::PinnedRegisterInfo(GPRReg sizeRegister, GPRReg baseMemoryPointer, GPRReg wasmContextInstancePointer)
: sizeRegister(sizeRegister)
, baseMemoryPointer(baseMemoryPointer)
, wasmContextInstancePointer(wasmContextInstancePointer)
{
}
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)