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352 lines
11 KiB
C++
352 lines
11 KiB
C++
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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 SpiderMonkey code.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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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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#ifndef jscompartment_h___
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#define jscompartment_h___
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#include "jscntxt.h"
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#include "jsgc.h"
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#include "jsmath.h"
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#include "jsobj.h"
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#include "jsfun.h"
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#include "jsgcstats.h"
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#include "jsclist.h"
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#include "jsxml.h"
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#ifdef _MSC_VER
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#pragma warning(push)
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#pragma warning(disable:4251) /* Silence warning about JS_FRIEND_API and data members. */
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#endif
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namespace js {
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/* Holds the number of recording attemps for an address. */
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typedef HashMap<jsbytecode*,
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size_t,
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DefaultHasher<jsbytecode*>,
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SystemAllocPolicy> RecordAttemptMap;
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/* Holds the profile data for loops. */
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typedef HashMap<jsbytecode*,
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LoopProfile*,
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DefaultHasher<jsbytecode*>,
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SystemAllocPolicy> LoopProfileMap;
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class Oracle;
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typedef HashSet<JSScript *,
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DefaultHasher<JSScript *>,
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SystemAllocPolicy> TracedScriptSet;
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/*
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* Trace monitor. Every JSCompartment has an associated trace monitor
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* that keeps track of loop frequencies for all JavaScript code loaded
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* into that runtime.
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*/
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struct TraceMonitor {
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/*
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* The context currently executing JIT-compiled code in this compartment, or
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* NULL if none. Among other things, this can in certain cases prevent
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* last-ditch GC and suppress calls to JS_ReportOutOfMemory.
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*
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* !tracecx && !recorder: not on trace
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* !tracecx && recorder: recording
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* tracecx && !recorder: executing a trace
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* tracecx && recorder: executing inner loop, recording outer loop
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*/
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JSContext *tracecx;
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/*
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* Cached storage to use when executing on trace. While we may enter nested
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* traces, we always reuse the outer trace's storage, so never need more
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* than of these.
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*/
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TraceNativeStorage *storage;
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/*
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* There are 4 allocators here. This might seem like overkill, but they
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* have different lifecycles, and by keeping them separate we keep the
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* amount of retained memory down significantly. They are flushed (ie.
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* all the allocated memory is freed) periodically.
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*
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* - dataAlloc has the lifecycle of the monitor. It's flushed only when
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* the monitor is flushed. It's used for fragments.
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*
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* - traceAlloc has the same flush lifecycle as the dataAlloc, but it is
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* also *marked* when a recording starts and rewinds to the mark point
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* if recording aborts. So you can put things in it that are only
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* reachable on a successful record/compile cycle like GuardRecords and
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* SideExits.
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*
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* - tempAlloc is flushed after each recording, successful or not. It's
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* used to store LIR code and for all other elements in the LIR
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* pipeline.
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*
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* - codeAlloc has the same lifetime as dataAlloc, but its API is
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* different (CodeAlloc vs. VMAllocator). It's used for native code.
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* It's also a good idea to keep code and data separate to avoid I-cache
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* vs. D-cache issues.
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*/
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VMAllocator* dataAlloc;
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VMAllocator* traceAlloc;
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VMAllocator* tempAlloc;
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nanojit::CodeAlloc* codeAlloc;
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nanojit::Assembler* assembler;
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FrameInfoCache* frameCache;
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/* This gets incremented every time the monitor is flushed. */
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uintN flushEpoch;
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Oracle* oracle;
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TraceRecorder* recorder;
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/* If we are profiling a loop, this tracks the current profile. Otherwise NULL. */
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LoopProfile* profile;
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GlobalState globalStates[MONITOR_N_GLOBAL_STATES];
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TreeFragment* vmfragments[FRAGMENT_TABLE_SIZE];
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RecordAttemptMap* recordAttempts;
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/* A hashtable mapping PC values to loop profiles for those loops. */
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LoopProfileMap* loopProfiles;
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/*
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* Maximum size of the code cache before we start flushing. 1/16 of this
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* size is used as threshold for the regular expression code cache.
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*/
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uint32 maxCodeCacheBytes;
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/*
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* If nonzero, do not flush the JIT cache after a deep bail. That would
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* free JITted code pages that we will later return to. Instead, set the
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* needFlush flag so that it can be flushed later.
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*/
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JSBool needFlush;
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/*
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* Fragment map for the regular expression compiler.
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*/
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REHashMap* reFragments;
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// Cached temporary typemap to avoid realloc'ing every time we create one.
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// This must be used in only one place at a given time. It must be cleared
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// before use.
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TypeMap* cachedTempTypeMap;
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/* Scripts with recorded fragments. */
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TracedScriptSet tracedScripts;
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#ifdef DEBUG
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/* Fields needed for fragment/guard profiling. */
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nanojit::Seq<nanojit::Fragment*>* branches;
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uint32 lastFragID;
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/*
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* profAlloc has a lifetime which spans exactly from js_InitJIT to
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* js_FinishJIT.
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*/
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VMAllocator* profAlloc;
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FragStatsMap* profTab;
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#endif
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bool ontrace() const {
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return !!tracecx;
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}
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/* Flush the JIT cache. */
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void flush();
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/* Sweep any cache entry pointing to dead GC things. */
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void sweep();
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bool outOfMemory() const;
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};
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namespace mjit {
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class JaegerCompartment;
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}
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}
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/* Number of potentially reusable scriptsToGC to search for the eval cache. */
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#ifndef JS_EVAL_CACHE_SHIFT
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# define JS_EVAL_CACHE_SHIFT 6
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#endif
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#define JS_EVAL_CACHE_SIZE JS_BIT(JS_EVAL_CACHE_SHIFT)
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#ifdef DEBUG
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# define EVAL_CACHE_METER_LIST(_) _(probe), _(hit), _(step), _(noscope)
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# define identity(x) x
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struct JSEvalCacheMeter {
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uint64 EVAL_CACHE_METER_LIST(identity);
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};
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# undef identity
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#endif
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struct JS_FRIEND_API(JSCompartment) {
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JSRuntime *rt;
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JSPrincipals *principals;
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js::gc::Chunk *chunk;
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js::gc::ArenaList arenas[js::gc::FINALIZE_LIMIT];
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js::gc::FreeLists freeLists;
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#ifdef JS_GCMETER
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js::gc::JSGCArenaStats compartmentStats[js::gc::FINALIZE_LIMIT];
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#endif
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#ifdef JS_TRACER
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/* Trace-tree JIT recorder/interpreter state. */
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js::TraceMonitor traceMonitor;
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#endif
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/* Lock-free hashed lists of scripts created by eval to garbage-collect. */
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JSScript *scriptsToGC[JS_EVAL_CACHE_SIZE];
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#ifdef DEBUG
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JSEvalCacheMeter evalCacheMeter;
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#endif
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void *data;
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bool marked;
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bool active; // GC flag, whether there are active frames
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js::WrapperMap crossCompartmentWrappers;
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#ifdef JS_METHODJIT
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js::mjit::JaegerCompartment *jaegerCompartment;
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#endif
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bool debugMode; // true iff debug mode on
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JSCList scripts; // scripts in this compartment
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/*
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* Weak references to lazily-created, well-known XML singletons.
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*
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* NB: Singleton objects must be carefully disconnected from the rest of
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* the object graph usually associated with a JSContext's global object,
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* including the set of standard class objects. See jsxml.c for details.
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*/
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JSObject *anynameObject;
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JSObject *functionNamespaceObject;
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JSCompartment(JSRuntime *cx);
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~JSCompartment();
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bool init();
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bool wrap(JSContext *cx, js::Value *vp);
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bool wrap(JSContext *cx, JSString **strp);
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bool wrap(JSContext *cx, JSObject **objp);
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bool wrapId(JSContext *cx, jsid *idp);
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bool wrap(JSContext *cx, js::PropertyOp *op);
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bool wrap(JSContext *cx, js::PropertyDescriptor *desc);
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bool wrap(JSContext *cx, js::AutoIdVector &props);
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bool wrapException(JSContext *cx);
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void sweep(JSContext *cx, uint32 releaseInterval);
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void purge(JSContext *cx);
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void finishArenaLists();
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bool arenaListsAreEmpty();
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private:
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js::MathCache *mathCache;
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js::MathCache *allocMathCache(JSContext *cx);
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public:
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js::MathCache *getMathCache(JSContext *cx) {
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return mathCache ? mathCache : allocMathCache(cx);
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}
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};
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#define JS_TRACE_MONITOR(cx) (cx->compartment->traceMonitor)
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#define JS_SCRIPTS_TO_GC(cx) (cx->compartment->scriptsToGC)
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namespace js {
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static inline MathCache *
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GetMathCache(JSContext *cx)
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{
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return cx->compartment->getMathCache(cx);
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}
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}
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#ifdef DEBUG
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# define EVAL_CACHE_METER(x) (cx->compartment->evalCacheMeter.x++)
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#else
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# define EVAL_CACHE_METER(x) ((void) 0)
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#endif
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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namespace js {
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class PreserveCompartment {
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protected:
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JSContext *cx;
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private:
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JSCompartment *oldCompartment;
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JS_DECL_USE_GUARD_OBJECT_NOTIFIER
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public:
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PreserveCompartment(JSContext *cx JS_GUARD_OBJECT_NOTIFIER_PARAM) : cx(cx) {
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JS_GUARD_OBJECT_NOTIFIER_INIT;
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oldCompartment = cx->compartment;
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}
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~PreserveCompartment() {
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cx->compartment = oldCompartment;
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}
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};
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class SwitchToCompartment : public PreserveCompartment {
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public:
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SwitchToCompartment(JSContext *cx, JSCompartment *newCompartment) : PreserveCompartment(cx) {
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cx->compartment = newCompartment;
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}
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SwitchToCompartment(JSContext *cx, JSObject *target) : PreserveCompartment(cx) {
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cx->compartment = target->getCompartment();
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}
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};
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}
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#endif /* jscompartment_h___ */
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