1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 * vim: set ts=4 sw=4 et tw=99:
4 * ***** BEGIN LICENSE BLOCK *****
5 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
7 * The contents of this file are subject to the Mozilla Public License Version
8 * 1.1 (the "License"); you may not use this file except in compliance with
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12 * Software distributed under the License is distributed on an "AS IS" basis,
13 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14 * for the specific language governing rights and limitations under the
17 * The Original Code is Mozilla SpiderMonkey JavaScript 1.9 code, released
20 * The Initial Developer of the Original Code is
21 * Brendan Eich <brendan@mozilla.org>
24 * David Anderson <danderson@mozilla.com>
26 * Alternatively, the contents of this file may be used under the terms of
27 * either of the GNU General Public License Version 2 or later (the "GPL"),
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38 * ***** END LICENSE BLOCK ***** */
40 #if !defined jsjaeger_imm_sync_h__ && defined JS_METHODJIT && defined JS_NUNBOX32
41 #define jsjaeger_imm_sync_h__
43 #include "methodjit/MachineRegs.h"
44 #include "methodjit/FrameEntry.h"
45 #include "CodeGenIncludes.h"
53 * This is a structure nestled within the FrameState used for safely syncing
54 * registers to memory during transitions from the fast path into a slow path
55 * stub call. During this process, the frame itself is immutable, and we may
56 * run out of registers needed to remat copies.
58 * This structure maintains a mapping of the tracker used to perform ad-hoc
59 * register allocation.
63 typedef JSC::MacroAssembler::RegisterID RegisterID;
64 typedef JSC::MacroAssembler::Address Address;
68 * NB: clobbered and sync mean the same thing: the register associated
69 * in the FrameEntry is no longer valid, and has been written back.
71 * They are separated for readability.
83 void reset(uint32 gen) {
84 dataClobbered = false;
85 typeClobbered = false;
94 ImmutableSync(JSContext *cx, const FrameState &frame);
96 bool init(uint32 nentries);
98 void reset(Assembler *masm, Registers avail, FrameEntry *top, FrameEntry *bottom);
99 void sync(FrameEntry *fe);
102 void syncCopy(FrameEntry *fe);
103 void syncNormal(FrameEntry *fe);
104 RegisterID ensureDataReg(FrameEntry *fe, SyncEntry &e);
105 RegisterID ensureTypeReg(FrameEntry *fe, SyncEntry &e);
106 RegisterID allocReg();
108 inline SyncEntry &entryFor(FrameEntry *fe);
110 bool shouldSyncType(FrameEntry *fe, SyncEntry &e);
111 bool shouldSyncData(FrameEntry *fe, SyncEntry &e);
116 const FrameState &frame;
120 SyncEntry *regs[Assembler::TotalRegisters];
126 } /* namespace mjit */
129 #endif /* jsjaeger_imm_sync_h__ */