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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) {
// We assume that R0 has been pushed, and R2 is unused.
static_assert(R2 == ValueOperand(r0));
// Compute frame size into w0. Used below in makeFrameDescriptor().
masm.Sub(x0, BaselineFrameReg64, masm.GetStackPointer64());
masm.Add(w0, w0, Operand(BaselineFrame::FramePointerOffset));
#ifdef DEBUG
// Store frame size without VMFunction arguments for debug assertions.
{
vixl::UseScratchRegisterScope temps(&masm.asVIXL());
const ARMRegister scratch32 = temps.AcquireW();
masm.Sub(scratch32, w0, Operand(argSize));
Address frameSizeAddr(BaselineFrameReg,
BaselineFrame::reverseOffsetOfDebugFrameSize());
masm.store32(scratch32.asUnsized(), frameSizeAddr);
}
#endif
// Push frame descriptor (minus the return address) and perform the tail call.
static_assert(ICTailCallReg == lr);
masm.makeFrameDescriptor(r0, FrameType::BaselineJS, ExitFrameLayout::Size());
masm.push(r0);
// 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 EmitBaselineCreateStubFrameDescriptor(MacroAssembler& masm,
Register reg,
uint32_t headerSize) {
ARMRegister reg64(reg, 64);
// Compute stub frame size.
masm.Sub(reg64, masm.GetStackPointer64(), Operand(sizeof(void*) * 2));
masm.Sub(reg64, BaselineFrameReg64, reg64);
masm.makeFrameDescriptor(reg, FrameType::BaselineStub, headerSize);
}
inline void EmitBaselineCallVM(TrampolinePtr target, MacroAssembler& masm) {
EmitBaselineCreateStubFrameDescriptor(masm, r0, ExitFrameLayout::Size());
masm.push(r0);
masm.call(target);
}
// Size of values pushed by EmitBaselineEnterStubFrame.
static const uint32_t STUB_FRAME_SIZE = 4 * sizeof(void*);
static const uint32_t STUB_FRAME_SAVED_STUB_OFFSET = sizeof(void*);
inline void EmitBaselineEnterStubFrame(MacroAssembler& masm, Register scratch) {
MOZ_ASSERT(scratch != ICTailCallReg);
// Compute frame size.
masm.Add(ARMRegister(scratch, 64), BaselineFrameReg64,
Operand(BaselineFrame::FramePointerOffset));
masm.Sub(ARMRegister(scratch, 64), ARMRegister(scratch, 64),
masm.GetStackPointer64());
#ifdef DEBUG
Address frameSizeAddr(BaselineFrameReg,
BaselineFrame::reverseOffsetOfDebugFrameSize());
masm.store32(scratch, frameSizeAddr);
#endif
// Note: when making changes here, don't forget to update STUB_FRAME_SIZE.
// Push frame descriptor and return address.
// Save old frame pointer, stack pointer, and stub reg.
masm.makeFrameDescriptor(scratch, FrameType::BaselineJS,
BaselineStubFrameLayout::Size());
masm.Push(scratch, ICTailCallReg, ICStubReg, BaselineFrameReg);
// Update the frame register.
masm.Mov(BaselineFrameReg64, masm.GetStackPointer64());
// Stack should remain 16-byte aligned.
masm.checkStackAlignment();
}
} // namespace jit
} // namespace js
#endif // jit_arm64_SharedICHelpers_arm64_inl_h
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