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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_inl_h
#define jit_arm64_SharedICHelpers_arm64_inl_h
#include "jit/BaselineFrame.h"
#include "jit/SharedICHelpers.h"
#include "jit/MacroAssembler-inl.h"
namespace js {
namespace jit {
inline void EmitBaselineTailCallVM(TrampolinePtr target, MacroAssembler& masm,
uint32_t argSize) {
#ifdef DEBUG
// We assume that R0 has been pushed, and R2 is unused.
static_assert(R2 == ValueOperand(r0));
// Store frame size without VMFunction arguments for debug assertions.
masm.Sub(x0, FramePointer64, masm.GetStackPointer64());
masm.Sub(w0, w0, Operand(argSize));
Address frameSizeAddr(FramePointer,
BaselineFrame::reverseOffsetOfDebugFrameSize());
masm.store32(w0.asUnsized(), frameSizeAddr);
#endif
// Push frame descriptor (minus the return address) and perform the tail call.
static_assert(ICTailCallReg == lr);
masm.pushFrameDescriptor(FrameType::BaselineJS);
// The return address will be pushed by the VM wrapper, for compatibility
// with direct calls. Refer to the top of generateVMWrapper().
// ICTailCallReg (lr) already contains the return address (as we keep
// it there through the stub calls).
masm.jump(target);
}
inline void EmitBaselineCallVM(TrampolinePtr target, MacroAssembler& masm) {
masm.pushFrameDescriptor(FrameType::BaselineStub);
masm.call(target);
}
inline void EmitBaselineEnterStubFrame(MacroAssembler& masm, Register scratch) {
MOZ_ASSERT(scratch != ICTailCallReg);
#ifdef DEBUG
// Compute frame size.
masm.Sub(ARMRegister(scratch, 64), FramePointer64, masm.GetStackPointer64());
Address frameSizeAddr(FramePointer,
BaselineFrame::reverseOffsetOfDebugFrameSize());
masm.store32(scratch, frameSizeAddr);
#endif
// Push frame descriptor and return address.
// Save old frame pointer, stack pointer, and stub reg.
masm.PushFrameDescriptor(FrameType::BaselineJS);
masm.Push(ICTailCallReg);
masm.Push(FramePointer);
// Update the frame register.
masm.Mov(FramePointer64, masm.GetStackPointer64());
masm.Push(ICStubReg);
// Stack should remain 16-byte aligned.
masm.checkStackAlignment();
}
} // namespace jit
} // namespace js
#endif // jit_arm64_SharedICHelpers_arm64_inl_h
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