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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_arm64_SharedICHelpers_arm64_h
#define jit_arm64_SharedICHelpers_arm64_h
#include "jit/BaselineIC.h"
#include "jit/JitFrames.h"
#include "jit/MacroAssembler.h"
#include "jit/SharedICRegisters.h"
namespace js {
namespace jit {
// Distance from sp to the top Value inside an IC stub (no return address on the
// stack on ARM).
static const size_t ICStackValueOffset = 0;
inline void EmitRestoreTailCallReg(MacroAssembler& masm) {
// No-op on ARM because link register is always holding the return address.
}
inline void EmitRepushTailCallReg(MacroAssembler& masm) {
// No-op on ARM because link register is always holding the return address.
}
inline void EmitCallIC(MacroAssembler& masm, CodeOffset* callOffset) {
// The stub pointer must already be in ICStubReg.
// Load stubcode pointer from the ICStub.
// R2 won't be active when we call ICs, so we can use r0.
static_assert(R2 == ValueOperand(r0));
masm.loadPtr(Address(ICStubReg, ICStub::offsetOfStubCode()), r0);
// Call the stubcode via a direct branch-and-link.
masm.Blr(x0);
*callOffset = CodeOffset(masm.currentOffset());
}
inline void EmitReturnFromIC(MacroAssembler& masm) {
masm.abiret(); // Defaults to lr.
}
inline void EmitBaselineLeaveStubFrame(MacroAssembler& masm,
bool calledIntoIon = false) {
vixl::UseScratchRegisterScope temps(&masm.asVIXL());
const ARMRegister scratch64 = temps.AcquireX();
// Ion frames do not save and restore the frame pointer. If we called
// into Ion, we have to restore the stack pointer from the frame descriptor.
// If we performed a VM call, the descriptor has been popped already so
// in that case we use the frame pointer.
if (calledIntoIon) {
masm.pop(scratch64.asUnsized());
masm.Lsr(scratch64, scratch64, FRAMESIZE_SHIFT);
masm.Add(masm.GetStackPointer64(), masm.GetStackPointer64(), scratch64);
} else {
masm.Mov(masm.GetStackPointer64(), BaselineFrameReg64);
}
// Pop values, discarding the frame descriptor.
masm.pop(BaselineFrameReg, ICStubReg, ICTailCallReg, scratch64.asUnsized());
// Stack should remain 16-byte aligned.
masm.checkStackAlignment();
}
template <typename AddrType>
inline void EmitPreBarrier(MacroAssembler& masm, const AddrType& addr,
MIRType type) {
// On AArch64, lr is clobbered by guardedCallPreBarrier. Save it first.
masm.push(lr);
masm.guardedCallPreBarrier(addr, type);
masm.pop(lr);
}
inline void EmitStubGuardFailure(MacroAssembler& masm) {
// Load next stub into ICStubReg.
masm.loadPtr(Address(ICStubReg, ICCacheIRStub::offsetOfNext()), ICStubReg);
// Return address is already loaded, just jump to the next stubcode.
masm.jump(Address(ICStubReg, ICStub::offsetOfStubCode()));
}
} // namespace jit
} // namespace js
#endif // jit_arm64_SharedICHelpers_arm64_h
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