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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_inl_h
#define jit_mips_shared_SharedICHelpers_mips_shared_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) {
Register scratch = R2.scratchReg();
// Compute frame size.
masm.movePtr(BaselineFrameReg, scratch);
masm.addPtr(Imm32(BaselineFrame::FramePointerOffset), scratch);
masm.subPtr(BaselineStackReg, scratch);
#ifdef DEBUG
// Store frame size without VMFunction arguments for debug assertions.
masm.subPtr(Imm32(argSize), scratch);
Address frameSizeAddr(BaselineFrameReg,
BaselineFrame::reverseOffsetOfDebugFrameSize());
masm.store32(scratch, frameSizeAddr);
masm.addPtr(Imm32(argSize), scratch);
#endif
// Push frame descriptor and perform the tail call.
// ICTailCallReg (ra) 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.
MOZ_ASSERT(ICTailCallReg == ra);
masm.makeFrameDescriptor(scratch, FrameType::BaselineJS,
ExitFrameLayout::Size());
masm.subPtr(Imm32(sizeof(CommonFrameLayout)), StackPointer);
masm.storePtr(scratch,
Address(StackPointer, CommonFrameLayout::offsetOfDescriptor()));
masm.storePtr(
ra, Address(StackPointer, CommonFrameLayout::offsetOfReturnAddress()));
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.movePtr(BaselineFrameReg, reg);
masm.addPtr(Imm32(sizeof(intptr_t) * 2), reg);
masm.subPtr(BaselineStackReg, reg);
masm.makeFrameDescriptor(reg, FrameType::BaselineStub, headerSize);
}
inline void EmitBaselineCallVM(TrampolinePtr target, MacroAssembler& masm) {
Register scratch = R2.scratchReg();
EmitBaselineCreateStubFrameDescriptor(masm, scratch, ExitFrameLayout::Size());
masm.push(scratch);
masm.call(target);
}
inline void EmitBaselineEnterStubFrame(MacroAssembler& masm, Register scratch) {
MOZ_ASSERT(scratch != ICTailCallReg);
// Compute frame size.
masm.movePtr(BaselineFrameReg, scratch);
masm.addPtr(Imm32(BaselineFrame::FramePointerOffset), scratch);
masm.subPtr(BaselineStackReg, scratch);
#ifdef DEBUG
Address frameSizeAddr(BaselineFrameReg,
BaselineFrame::reverseOffsetOfDebugFrameSize());
masm.store32(scratch, frameSizeAddr);
#endif
// Note: when making changes here, don't forget to update
// BaselineStubFrame if needed.
// Push frame descriptor and return address.
masm.makeFrameDescriptor(scratch, FrameType::BaselineJS,
BaselineStubFrameLayout::Size());
masm.subPtr(Imm32(STUB_FRAME_SIZE), StackPointer);
masm.storePtr(scratch,
Address(StackPointer, offsetof(BaselineStubFrame, descriptor)));
masm.storePtr(ICTailCallReg, Address(StackPointer, offsetof(BaselineStubFrame,
returnAddress)));
// Save old frame pointer, stack pointer and stub reg.
masm.storePtr(ICStubReg,
Address(StackPointer, offsetof(BaselineStubFrame, savedStub)));
masm.storePtr(BaselineFrameReg,
Address(StackPointer, offsetof(BaselineStubFrame, savedFrame)));
masm.movePtr(BaselineStackReg, BaselineFrameReg);
// Stack should remain aligned.
masm.assertStackAlignment(sizeof(Value), 0);
}
} // namespace jit
} // namespace js
#endif /* jit_mips_shared_SharedICHelpers_mips_shared_inl_h */