IonGenericCallStub.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 * vim: set ts=8 sts=2 et sw=2 tw=80:

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef jit_IonGenericCallStub_h

#define jit_IonGenericCallStub_h

#include "jit/Registers.h"

namespace js::jit {

#ifndef JS_USE_LINK_REGISTER

static constexpr Register IonGenericCallReturnAddrReg = CallTempReg0;

#endif

static constexpr Register IonGenericCallCalleeReg = CallTempReg1;

static constexpr Register IonGenericCallArgcReg = CallTempReg2;

#ifdef JS_CODEGEN_ARM

// We need a second scratch register that does not alias `lr` or

// any of the registers the ABI uses to pass arguments.

static_assert(CallTempReg0 == CallTempNonArgRegs[0]);

static constexpr Register IonGenericSecondScratchReg = CallTempReg0;

#endif

inline AllocatableGeneralRegisterSet IonGenericCallScratchRegs() {

  AllocatableGeneralRegisterSet regs(GeneralRegisterSet::All());

  MOZ_ASSERT(!regs.has(FramePointer));

  regs.take(IonGenericCallCalleeReg);

  regs.take(IonGenericCallArgcReg);

#ifndef JS_USE_LINK_REGISTER

  regs.take(IonGenericCallReturnAddrReg);

#endif

#ifdef JS_CODEGEN_ARM

  regs.take(IonGenericSecondScratchReg);

#endif

  return regs;

}  // namespace js::jit

#endif /* jit_IonGenericCallStub_h */