WasmCallingConvention.cpp [plain text]
#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, [] () {
RegisterSet callerSaveRegisters = RegisterSet::allRegisters();
callerSaveRegisters.exclude(RegisterSet::calleeSaveRegisters());
staticJSCallingConvention.construct(Vector<Reg>(), Vector<Reg>(), RegisterSet::calleeSaveRegisters(), WTFMove(callerSaveRegisters));
});
return staticJSCallingConvention;
}
const WasmCallingConvention& wasmCallingConvention()
{
static LazyNeverDestroyed<WasmCallingConvention> staticWasmCallingConvention;
static std::once_flag staticWasmCallingConventionFlag;
std::call_once(staticWasmCallingConventionFlag, [] () {
Vector<Reg> gprArgumentRegisters(GPRInfo::numberOfArgumentRegisters);
for (unsigned i = 0; i < GPRInfo::numberOfArgumentRegisters; ++i)
gprArgumentRegisters[i] = GPRInfo::toArgumentRegister(i);
Vector<Reg> fprArgumentRegisters(FPRInfo::numberOfArgumentRegisters);
for (unsigned i = 0; i < FPRInfo::numberOfArgumentRegisters; ++i)
fprArgumentRegisters[i] = FPRInfo::toArgumentRegister(i);
RegisterSet scratch = RegisterSet::allGPRs();
scratch.exclude(RegisterSet::calleeSaveRegisters());
scratch.exclude(RegisterSet::macroScratchRegisters());
scratch.exclude(RegisterSet::reservedHardwareRegisters());
scratch.exclude(RegisterSet::stackRegisters());
for (Reg reg : gprArgumentRegisters)
scratch.clear(reg);
Vector<GPRReg> scratchGPRs;
for (Reg reg : scratch)
scratchGPRs.append(reg.gpr());
RELEASE_ASSERT(scratchGPRs.size() >= 2);
RegisterSet callerSaveRegisters = RegisterSet::allRegisters();
callerSaveRegisters.exclude(RegisterSet::calleeSaveRegisters());
staticWasmCallingConvention.construct(WTFMove(gprArgumentRegisters), WTFMove(fprArgumentRegisters), WTFMove(scratchGPRs), RegisterSet::calleeSaveRegisters(), WTFMove(callerSaveRegisters));
});
return staticWasmCallingConvention;
}
}
#endif // ENABLE(B3_JIT)