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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_x86_SharedICHelpers_x86_h
#define jit_x86_SharedICHelpers_x86_h
#include "jit/BaselineIC.h"
#include "jit/JitFrames.h"
#include "jit/MacroAssembler.h"
#include "jit/SharedICRegisters.h"
namespace js {
namespace jit {
// Distance from stack top to the top Value inside an IC stub (this is the
// return address).
static const size_t ICStackValueOffset = sizeof(void*);
inline void EmitRestoreTailCallReg(MacroAssembler& masm) {
masm.Pop(ICTailCallReg);
}
inline void EmitRepushTailCallReg(MacroAssembler& masm) {
masm.Push(ICTailCallReg);
}
inline void EmitCallIC(MacroAssembler& masm, CodeOffset* callOffset) {
// The stub pointer must already be in ICStubReg.
// Call the stubcode.
masm.call(Address(ICStubReg, ICStub::offsetOfStubCode()));
*callOffset = CodeOffset(masm.currentOffset());
}
inline void EmitReturnFromIC(MacroAssembler& masm) { masm.ret(); }
inline void EmitBaselineLeaveStubFrame(MacroAssembler& masm) {
Address stubAddr(FramePointer, BaselineStubFrameLayout::ICStubOffsetFromFP);
masm.loadPtr(stubAddr, ICStubReg);
masm.mov(FramePointer, StackPointer);
masm.Pop(FramePointer);
// The return address is on top of the stack, followed by the frame
// descriptor. Use a pop instruction to overwrite the frame descriptor
// with the return address. Note that pop increments the stack pointer
// before computing the address.
masm.Pop(Operand(StackPointer, 0));
}
template <typename AddrType>
inline void EmitPreBarrier(MacroAssembler& masm, const AddrType& addr,
MIRType type) {
masm.guardedCallPreBarrier(addr, type);
}
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.jmp(Operand(ICStubReg, ICStub::offsetOfStubCode()));
}
} // namespace jit
} // namespace js
#endif /* jit_x86_SharedICHelpers_x86_h */
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