mirror of
https://github.com/UOX3DevTeam/UOX3
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130 lines
4.2 KiB
C++
130 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=4 sw=4 et tw=99:
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla SpiderMonkey JavaScript 1.9 code, released
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* May 28, 2008.
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*
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* The Initial Developer of the Original Code is
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* Brendan Eich <brendan@mozilla.org>
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*
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* Contributor(s):
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* David Anderson <danderson@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#if !defined jsjaeger_imm_sync_h__ && defined JS_METHODJIT && defined JS_NUNBOX32
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#define jsjaeger_imm_sync_h__
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#include "methodjit/MachineRegs.h"
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#include "methodjit/FrameEntry.h"
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#include "CodeGenIncludes.h"
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namespace js {
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namespace mjit {
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class FrameState;
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/*
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* This is a structure nestled within the FrameState used for safely syncing
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* registers to memory during transitions from the fast path into a slow path
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* stub call. During this process, the frame itself is immutable, and we may
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* run out of registers needed to remat copies.
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*
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* This structure maintains a mapping of the tracker used to perform ad-hoc
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* register allocation.
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*/
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class ImmutableSync
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{
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typedef JSC::MacroAssembler::RegisterID RegisterID;
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typedef JSC::MacroAssembler::Address Address;
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struct SyncEntry {
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/*
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* NB: clobbered and sync mean the same thing: the register associated
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* in the FrameEntry is no longer valid, and has been written back.
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*
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* They are separated for readability.
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*/
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uint32 generation;
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bool dataClobbered;
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bool typeClobbered;
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bool hasDataReg;
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bool hasTypeReg;
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bool learnedType;
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RegisterID dataReg;
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RegisterID typeReg;
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JSValueType type;
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void reset(uint32 gen) {
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dataClobbered = false;
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typeClobbered = false;
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hasDataReg = false;
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hasTypeReg = false;
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learnedType = false;
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generation = gen;
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}
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};
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public:
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ImmutableSync(JSContext *cx, const FrameState &frame);
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~ImmutableSync();
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bool init(uint32 nentries);
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void reset(Assembler *masm, Registers avail, FrameEntry *top, FrameEntry *bottom);
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void sync(FrameEntry *fe);
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private:
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void syncCopy(FrameEntry *fe);
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void syncNormal(FrameEntry *fe);
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RegisterID ensureDataReg(FrameEntry *fe, SyncEntry &e);
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RegisterID ensureTypeReg(FrameEntry *fe, SyncEntry &e);
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RegisterID allocReg();
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inline SyncEntry &entryFor(FrameEntry *fe);
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bool shouldSyncType(FrameEntry *fe, SyncEntry &e);
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bool shouldSyncData(FrameEntry *fe, SyncEntry &e);
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private:
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JSContext *cx;
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SyncEntry *entries;
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const FrameState &frame;
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uint32 nentries;
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Registers avail;
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Assembler *masm;
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SyncEntry *regs[Assembler::TotalRegisters];
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FrameEntry *top;
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FrameEntry *bottom;
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uint32 generation;
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};
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} /* namespace mjit */
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} /* namespace js */
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#endif /* jsjaeger_imm_sync_h__ */
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