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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_arm_SharedICHelpers_arm_inl_h
#define jit_arm_SharedICHelpers_arm_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 during this that R0 and R1 have been pushed, and that R2 is
// unused.
static_assert(R2 == ValueOperand(r1, r0));
// Compute frame size.
masm.movePtr(BaselineFrameReg, r0);
masm.as_add(r0, r0, Imm8(BaselineFrame::FramePointerOffset));
masm.ma_sub(BaselineStackReg, r0);
#ifdef DEBUG
// Store frame size without VMFunction arguments for debug assertions.
{
ScratchRegisterScope scratch(masm);
masm.ma_sub(r0, Imm32(argSize), r1, scratch);
}
Address frameSizeAddr(BaselineFrameReg,
BaselineFrame::reverseOffsetOfDebugFrameSize());
masm.store32(r1, frameSizeAddr);
#endif
// Push frame descriptor and perform the tail call.
// ICTailCallReg (lr) already contains the return address (as we keep
// it there through the stub calls), but the VMWrapper code being called
// expects the return address to also be pushed on the stack.
static_assert(ICTailCallReg == lr);
masm.makeFrameDescriptor(r0, FrameType::BaselineJS, ExitFrameLayout::Size());
masm.push(r0);
masm.push(lr);
masm.jump(target);
}
inline void EmitBaselineCreateStubFrameDescriptor(MacroAssembler& masm,
Register reg,
uint32_t headerSize) {
// Compute stub frame size. We have to add two pointers: the stub reg and
// previous frame pointer pushed by EmitEnterStubFrame.
masm.mov(BaselineFrameReg, reg);
masm.as_add(reg, reg, Imm8(sizeof(void*) * 2));
masm.ma_sub(BaselineStackReg, reg);
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.mov(BaselineFrameReg, scratch);
masm.as_add(scratch, scratch, Imm8(BaselineFrame::FramePointerOffset));
masm.ma_sub(BaselineStackReg, scratch);
#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 if
// needed.
// Push frame descriptor and return address.
masm.makeFrameDescriptor(scratch, FrameType::BaselineJS,
BaselineStubFrameLayout::Size());
masm.Push(scratch);
masm.Push(ICTailCallReg);
// Save old frame pointer, stack pointer and stub reg.
masm.Push(ICStubReg);
masm.Push(BaselineFrameReg);
masm.mov(BaselineStackReg, BaselineFrameReg);
// We pushed 4 words, so the stack is still aligned to 8 bytes.
masm.checkStackAlignment();
}
} // namespace jit
} // namespace js
#endif /* jit_arm_SharedICHelpers_arm_inl_h */