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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_mips_shared_SharedICHelpers_mips_shared_h
#define jit_mips_shared_SharedICHelpers_mips_shared_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 MIPS).
static const size_t ICStackValueOffset = 0;
struct BaselineStubFrame {
uintptr_t savedFrame;
uintptr_t savedStub;
uintptr_t returnAddress;
uintptr_t descriptor;
};
inline void EmitRestoreTailCallReg(MacroAssembler& masm) {
// No-op on MIPS because ra register is always holding the return address.
}
inline void EmitRepushTailCallReg(MacroAssembler& masm) {
// No-op on MIPS because ra 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 it as scratch.
masm.loadPtr(Address(ICStubReg, ICStub::offsetOfStubCode()), R2.scratchReg());
// Call the stubcode via a direct jump-and-link
masm.call(R2.scratchReg());
*callOffset = CodeOffset(masm.currentOffset());
}
inline void EmitReturnFromIC(MacroAssembler& masm) { masm.branch(ra); }
inline void EmitBaselineLeaveStubFrame(MacroAssembler& masm) {
masm.loadPtr(
Address(FramePointer, BaselineStubFrameLayout::ICStubOffsetFromFP),
ICStubReg);
masm.movePtr(FramePointer, StackPointer);
masm.Pop(FramePointer);
// Load the return address.
masm.Pop(ICTailCallReg);
// Discard the frame descriptor.
{
SecondScratchRegisterScope scratch2(masm);
masm.Pop(scratch2);
}
}
template <typename AddrType>
inline void EmitPreBarrier(MacroAssembler& masm, const AddrType& addr,
MIRType type) {
// On MIPS, $ra is clobbered by guardedCallPreBarrier. Save it first.
masm.push(ra);
masm.guardedCallPreBarrier(addr, type);
masm.pop(ra);
}
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.
MOZ_ASSERT(ICTailCallReg == ra);
masm.jump(Address(ICStubReg, ICStub::offsetOfStubCode()));
}
} // namespace jit
} // namespace js
#endif /* jit_mips_shared_SharedICHelpers_mips_shared_h */
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