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WasmCallingConvention.cpp
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139 lines (115 loc) · 5.73 KB
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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 "WasmCallingConvention.h"
#if ENABLE(WEBASSEMBLY)
#include <wtf/NeverDestroyed.h>
namespace JSC::Wasm {
const JSCallingConvention& jsCallingConvention()
{
static LazyNeverDestroyed<JSCallingConvention> staticJSCallingConvention;
static std::once_flag staticJSCCallingConventionFlag;
std::call_once(staticJSCCallingConventionFlag, [] () {
staticJSCallingConvention.construct(Vector<JSValueRegs>(), Vector<FPRReg>(), RegisterSet::calleeSaveRegisters());
});
return staticJSCallingConvention;
}
const WasmCallingConvention& wasmCallingConvention()
{
static LazyNeverDestroyed<WasmCallingConvention> staticWasmCallingConvention;
static std::once_flag staticWasmCallingConventionFlag;
std::call_once(staticWasmCallingConventionFlag, [] () {
#if USE(JSVALUE64) // One value per GPR
constexpr unsigned numberOfArgumentJSRs = GPRInfo::numberOfArgumentRegisters;
#elif USE(JSVALUE32_64) // One value per consecutive GPR pair
constexpr unsigned numberOfArgumentJSRs = GPRInfo::numberOfArgumentRegisters / 2;
#endif
Vector<JSValueRegs> jsrArgumentRegisters(numberOfArgumentJSRs);
for (unsigned i = 0; i < numberOfArgumentJSRs; ++i) {
#if USE(JSVALUE64)
jsrArgumentRegisters[i] = JSValueRegs { GPRInfo::toArgumentRegister(i) };
#elif USE(JSVALUE32_64)
jsrArgumentRegisters[i] = JSValueRegs { GPRInfo::toArgumentRegister(2 * i + 1), GPRInfo::toArgumentRegister(2 * i) };
#endif
}
Vector<FPRReg> fprArgumentRegisters(FPRInfo::numberOfArgumentRegisters);
for (unsigned i = 0; i < FPRInfo::numberOfArgumentRegisters; ++i)
fprArgumentRegisters[i] = FPRInfo::toArgumentRegister(i);
RegisterSet scratch = RegisterSet::allGPRs();
scratch.exclude(RegisterSet::vmCalleeSaveRegisters().includeWholeRegisterWidth());
scratch.exclude(RegisterSet::macroClobberedGPRs());
scratch.exclude(RegisterSet::reservedHardwareRegisters());
scratch.exclude(RegisterSet::stackRegisters());
for (JSValueRegs jsr : jsrArgumentRegisters) {
scratch.remove(jsr.payloadGPR());
#if USE(JSVALUE32_64)
scratch.remove(jsr.tagGPR());
#endif
}
Vector<GPRReg> scratchGPRs;
for (Reg reg : scratch)
scratchGPRs.append(reg.gpr());
// Need at least one JSValue and an additional GPR
#if USE(JSVALUE64)
RELEASE_ASSERT(scratchGPRs.size() >= 2);
#elif USE(JSVALUE32_64)
RELEASE_ASSERT(scratchGPRs.size() >= 3);
#endif
staticWasmCallingConvention.construct(WTF::move(jsrArgumentRegisters), WTF::move(fprArgumentRegisters), WTF::move(scratchGPRs), RegisterSet::calleeSaveRegisters());
});
return staticWasmCallingConvention;
}
#if CPU(ARM_THUMB2)
const CCallingConventionArmThumb2& cCallingConventionArmThumb2()
{
static LazyNeverDestroyed<CCallingConventionArmThumb2> staticCCallingConventionArmThumb2;
static std::once_flag staticCCallingConventionArmThumb2Flag;
std::call_once(staticCCallingConventionArmThumb2Flag, [] () {
constexpr unsigned numberOfArgumentGPRs = GPRInfo::numberOfArgumentRegisters;
Vector<GPRReg> gprArgumentRegisters(numberOfArgumentGPRs);
for (unsigned i = 0; i < numberOfArgumentGPRs; ++i)
gprArgumentRegisters[i] = GPRInfo::toArgumentRegister(i);
Vector<FPRReg> fprArgumentRegisters(FPRInfo::numberOfArgumentRegisters);
for (unsigned i = 0; i < FPRInfo::numberOfArgumentRegisters; ++i)
fprArgumentRegisters[i] = FPRInfo::toArgumentRegister(i);
RegisterSet scratch = RegisterSet::allGPRs();
scratch.exclude(RegisterSet::vmCalleeSaveRegisters().includeWholeRegisterWidth());
scratch.exclude(RegisterSet::macroClobberedGPRs());
scratch.exclude(RegisterSet::reservedHardwareRegisters());
scratch.exclude(RegisterSet::stackRegisters());
for (GPRReg gpr : gprArgumentRegisters)
scratch.remove(gpr);
Vector<GPRReg> scratchGPRs;
for (Reg reg : scratch)
scratchGPRs.append(reg.gpr());
// Need at least one JSValue and an additional GPR
RELEASE_ASSERT(scratchGPRs.size() >= 3);
staticCCallingConventionArmThumb2.construct(WTF::move(gprArgumentRegisters), WTF::move(fprArgumentRegisters), WTF::move(scratchGPRs), RegisterSet::calleeSaveRegisters());
});
return staticCCallingConventionArmThumb2;
}
#endif
} // namespace JSC::Wasm
#endif // ENABLE(B3_JIT)